JP2003269458A - Synthetic resinous thrust slide bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resinous thrust slide bearing which suppresses loss of lubricating oil from a sliding surface in long use, sliding with low torque, prevents the generation of frictional sound, and ensures smooth steering operation even when built in a strut type suspension. <P>SOLUTION: This synthetic resinous thrust slide bearing 1 is composed of a synthetic resinous upper case 100, a synthetic resinous lower case 200, and a synthetic resinous bearing piece 300 arranged between the upper and lower cases 100, 200. The synthetic resinous piece 300 comprises a plurality of radial grooves 305 arranged on lower surfaces 302, 303 in a circumferential direction at even intervals, so as to open to a circular hole 301 at one end and open to an outer peripheral surface 304 at the other end, and a recessed portion 312 divided by the radial grooves 305 and surrounded by flat surface portions 308 to 311 on the same surface with dividing surfaces 306, 307 on the dividing surfaces 306, 307 of the lower surfaces 302, 303. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin thrust slide bearing, and more particularly to a synthetic resin thrust slide bearing suitable for being incorporated in a strut suspension (McPherson type) of a four-wheeled vehicle.

[0002]

2. Description of the Related Art Generally, a strut suspension is mainly used for front wheels of a four-wheeled vehicle, and is a combination of a coil spring and a strut assembly having a hydraulic shock absorber built in an outer cylinder integrated with a main shaft. The suspension has a structure in which the axis of the coil spring is positively offset with respect to the axis of the strut so that the piston rod of the shock absorber built in the strut can smoothly slide, and the coil spring with respect to the axis of the strut. There is a structure in which the axes of are aligned with each other. In either structure, when the strut assembly rotates together with the coil spring by steering operation, a bearing is arranged between the mounting member of the vehicle body and the upper spring seat of the coil spring to allow the rotation smoothly.

As this thrust bearing, a rolling bearing using balls or needles or a sliding bearing made of synthetic resin is used. However, rolling bearings
There is a possibility that the ball or the needle may be damaged by fatigue due to a slight swing and a vibration load, and it is difficult to maintain a smooth steering operation. Thrust plain bearings
The friction torque is higher than that of the rolling bearing, and there is a problem that the steering operation becomes heavy. Further, in any of the bearings, the problem of making the steering operation heavy due to the high frictional force of the dust seal made of a rubber elastic body mounted to prevent the intrusion of foreign matter such as dust to the sliding surface, especially the synthetic The resin slide bearing has a problem that the steering operation is made heavier.

Further, in the plain bearing, there is a problem that a stick-slip phenomenon occurs, and a frictional noise due to the stick-slip phenomenon is often generated.
Frictional noise caused by this stick-slip phenomenon hardly occurs as long as a lubricating oil such as grease intervenes on the sliding surface as desired, but the lubricating oil disappears from the sliding surface due to long-term use. There may be a case where a fricative noise starts to occur.

In order to solve the above problems of the conventional bearing,
The applicant of the present invention has filed Japanese Utility Model Application No. 61-196804 (Actual Fairness 2-
No. 6263) proposed a synthetic resin thrust bearing. This will be described below with reference to the drawing. FIG.
1, the synthetic resin thrust bearing 1 includes an upper case 10 made of synthetic resin, a lower case 20 made of synthetic resin, and a bearing piece 30 made of synthetic resin arranged between the upper and lower cases 10 and 20. The upper case 10 is provided with a disk-shaped flat surface portion 12 having a circular hole 11 in a central portion, and a cylindrical engagement hanging portion 13 integrally formed on an outer peripheral edge of the disk-shaped flat surface portion 12.
And the engaging hook portion 14 formed on the inner peripheral surface of the end portion of the cylindrical engaging hanging portion 13, and the lower case 20 has a cylindrical portion 22 having an inner peripheral surface defining the insertion hole 21, An annular wide brim portion 24 integrally formed by protruding a part 23 of the cylindrical portion 22 on an outer peripheral surface of the cylindrical portion 22, and a cylindrical engagement integrally formed on an outer peripheral edge of the annular wide brim portion 24. Protrusion 25
And an engaging portion 26 formed on the outer peripheral surface of the lower end of the cylindrical engaging protrusion 25, the upper case 10 has the engaging hook portion 14 in the engaging portion 26 of the lower case 20. It is elastically attached and combined with the lower case 20.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The synthetic resin thrust bearing proposed in No. 196804 has the problems of the conventional synthetic resin slide bearings, that is, for the purpose of preventing foreign matter such as dust from entering the bearing sliding surface,
It is possible to solve the problem of an increase in steering operation force due to a dust seal made of a rubber elastic body which is mounted between the sliding surfaces so as to surround the sliding surfaces. It was possible to prevent intrusion as much as possible and obtain a stable and smooth steering operation force.

However, even in the above synthetic resin thrust bearing, depending on the combination of synthetic resins forming the upper and lower cases 10 and 20 and the bearing piece 30 disposed between the upper and lower cases 10 and 20, , Lower case 10, 2
It has been found that a stick-slip phenomenon occurs between 0 and the bearing piece 30, and a frictional noise due to the stick-slip phenomenon is often generated.

Further, a lubricating oil such as grease usually filled between the upper and lower cases 10 and 20 is used as the upper and lower cases 1.
As long as the clearances 0, 20 and the upper and lower cases 10, 20 and the bearing pieces 30 are intervened as desired, the above-mentioned frictional noise hardly occurs. In some cases, it may not be possible to ensure the desired interposition of the lubricating oil agent due to the squeezeout (extrusion) and the disappearance of the lubricating oil agent due to long-term use.

The present invention has been made in view of the above points, and it is an object of the present invention to prevent the lubricant from disappearing from the sliding surface even when used for a long period of time and to slide with a low friction torque. It is an object of the present invention to provide a synthetic resin thrust slide bearing that does not generate frictional noise and can ensure smooth steering operation even when incorporated in a strut suspension.

[0010]

A synthetic resin thrust plain bearing according to a first aspect of the present invention is arranged between a synthetic resin upper case, a synthetic resin lower case, and the upper and lower cases. And a synthetic resin bearing piece, wherein the upper case is a synthetic resin thrust slide bearing elastically attached to the lower case and combined with the lower case,
The bearing piece is composed of a circular plate having a circular hole in the center thereof, and further has a plurality of radial grooves on the lower surface, one end of which is opened to the circular hole and the other end of which is opened to the outer peripheral surface. Each of the divided surfaces of the lower surface, which is divided by the radial groove, has a recess surrounded by a flat surface portion, and the radial groove and the recess are filled with a lubricant.

According to the thrust slide bearing of the first aspect,
The bearing piece has a plurality of radial grooves, one end of which is open to the circular hole on the lower surface and the other end of which is open to the outer peripheral surface, and the bearing piece is divided by the radial grooves. Since the flat surface has recesses surrounded by flat surface portions, these flat surface portions become actual sliding surfaces, and as a result, the load (contact pressure) per unit contact area of the sliding surfaces is increased. Since the coefficient of friction can be lowered, smooth steering operation can be secured even when incorporated in a strut suspension.

In addition to the above structure, a plurality of radial grooves formed on the upper and lower surfaces of the bearing piece and recesses formed on the respective divided surfaces of the upper and lower surfaces are filled with a lubricant such as grease. Therefore, as a result that the lubricant is always present on the sliding surface, the stick-slip phenomenon does not occur, and the friction noise caused by the stick-slip phenomenon does not occur.

A synthetic resin thrust sliding bearing according to a second aspect of the present invention is a synthetic resin upper case, a synthetic resin lower case, and a synthetic resin bearing disposed between the upper and lower cases. A synthetic resin thrust slide bearing in which the upper case is elastically attached to the lower case and is combined with the lower case, the bearing piece having a circular hole in the center thereof. The plate is provided with an annular groove on the lower surface surrounding the circular hole, and a plurality of radial grooves having one end opening to the annular groove and the other end opening to the outer peripheral surface. Further, each of the divided surfaces of the lower surface, which is divided by the groove, is provided with a recess surrounded by a flat surface portion, and the radial groove, the annular groove and the recess are filled with a lubricant. There is.

According to the thrust slide bearing of the second aspect,
The bearing piece further has an annular groove surrounding the circular hole on the lower surface, and a plurality of radial grooves having one end opening to the annular groove and the other end opening to the outer peripheral surface. Since each of the upper and lower surfaces divided by the above has a recess surrounded by a flat surface portion, like the thrust slide bearing of the first aspect, these flat surface portions are the actual sliding surfaces. As a result,
The load (contact pressure) per unit contact area of the sliding surface is increased, and as a result, the coefficient of friction can be lowered, so that smooth steering operation can be ensured even when incorporated in a strut suspension, and these radial Since the groove, the annular groove and the recess are filled with a lubricant such as grease,
Since the lubricant is always present on the sliding surface, the stick-slip phenomenon does not occur as a result, and the friction noise caused by the stick-slip phenomenon does not occur.

In the thrust slide bearings of the first and second aspects, as the synthetic resin forming the upper and lower cases,
Polyacetal resin, polyamide resin, polycarbonate resin or the like is preferably used, and as the synthetic resin forming the bearing piece, polyamide resin, polyolefin resin, fluorine resin or the like is preferably used.

The radial grooves in the thrust slide bearing of the first or second aspect are, as in the synthetic resin thrust slide bearing of the third aspect of the present invention, equidistantly in the circumferential direction on the upper and lower surfaces of the bearing piece. It is good to be arranged in.

Like the thrust slide bearing of the fourth aspect, the recess in the present invention comprises one inner peripheral edge of the flat surface portion and the other inner peripheral edge of the flat surface portion facing the one inner peripheral edge. Even though the concave curved surfaces are defined so that the depths gradually increase toward the central portion, one inner peripheral edge of the flat surface portion and the one inner peripheral edge face each other like the thrust slide bearing of the fifth aspect. The flat surface portion may be defined by a conical surface so that the depth gradually increases from the other inner peripheral edge of the flat surface portion to the central portion. The depth of the deepest part of the recess is 0.0
From 5 mm to 0.15 mm, preferably 0.05 mm
To 0.09 mm, more preferably more than 0.09 mm to 0.12 mm, still more preferably 0.1.
It is more than 2 mm and up to 0.15 mm. In particular,
It has a circular hole with a diameter of 44.2 mm and an outer diameter of 59.3 m.
m is a synthetic resin bearing piece having a thickness of 2.3 mm,
In a bearing piece having a width of 2.1 mm, a depth of 0.47 mm, and 16 radial grooves at equal intervals in the circumferential direction, the deepest part of the recess may have a depth of about 0.09 mm.

The depths of these recesses are gradually increased from one inner peripheral edge of the flat surface portion and the other inner peripheral edge of the flat surface portion facing the one inner peripheral edge to the central portion. Since the lubricating oil such as grease filled in the recess is supplied to the flat surface portion which is the actual sliding surface under the thrust load, the lubricating oil is always present on the sliding surface. There is no slip phenomenon,
Friction noise caused by the stick-slip phenomenon is not generated.

A synthetic resin thrust sliding bearing according to a sixth aspect of the present invention is the synthetic resin thrust sliding bearing according to any one of the first to fifth aspects, in which the bearing piece has a flat surface on the upper surface of the upper case. Further, the flat surface portion of the lower surface thereof is slidably in contact with the lower case, and is disposed between the upper and lower cases.

According to the synthetic resin thrust slide bearing of the seventh aspect of the present invention, in the synthetic resin thrust slide bearing according to any one of the first to sixth aspects, the upper case is a circle having a circular hole in the center. A plate-shaped flat surface portion, a cylindrical engagement hanging portion integrally formed on an outer peripheral edge of the disc-shaped flat surface portion, and an engagement hook portion formed on an inner peripheral surface of an end portion of the cylindrical engagement hanging portion. The lower case has a disk-shaped flat portion having an insertion hole having the same diameter as the circular hole of the upper case in the central portion, and an inner diameter having the same diameter as the insertion hole, and the circular plate shape of the lower case. A cylindrical portion formed on the upper surface of the flat surface portion, and a cylindrical engagement protrusion formed integrally with the outer peripheral edge of the disk-shaped flat surface portion of the lower case at a predetermined distance radially outward from the cylindrical portion. And an engaging portion formed on the outer peripheral surface of the lower end of the cylindrical engaging protrusion, the upper case including the engaging hook. Made is combined to the lower casing by the elastic is attached to the engaging portion.

According to the synthetic resin thrust plain bearing of the seventh aspect, the upper and lower cases are combined with each other by elastically mounting the engaging hook portions of the upper case to the engaging portions of the lower case. The assembling work can be performed extremely easily.

According to the synthetic resin thrust slide bearing of the eighth aspect of the present invention, in the synthetic resin thrust slide bearing of the seventh aspect, the circular hole of the disk has a diameter larger than the outer diameter of the cylindrical portion. The disk has an outer diameter smaller than the inner diameter of the cylindrical engaging projection, and its upper surface is the lower surface of the disk-shaped flat surface portion of the upper case and its lower surface is the lower portion. The disk-shaped flat portion of the case is slidably contacted with the upper surface of the flat surface portion, and is disposed between the upper and lower cases.

According to the synthetic resin thrust sliding bearing of the ninth aspect of the present invention, in the synthetic resin thrust sliding bearing according to any one of the first to sixth aspects, the upper case is a circle having a circular hole in the center. A plate-shaped flat surface portion, a cylindrical hanging portion integrally formed on the lower surface of the disk-shaped flat surface portion at a predetermined distance radially outward from the peripheral edge of the circular hole of the disk-shaped flat surface portion, and the cylinder. A cylindrical engaging hanging portion integrally formed with the cylindrical hanging portion at an outer peripheral edge of the disc-shaped flat surface portion so as to form an annular groove in cooperation with the hanging portion and at a predetermined interval in the radial direction. And a engaging hook portion formed on the inner peripheral surface of the end of the cylindrical engaging hanging portion, and the lower case has a disc having an insertion hole having the same diameter as the circular hole of the upper case in the central portion. -Shaped flat surface portion, and a cylindrical portion formed on the upper surface of the disk-shaped flat surface portion of the lower case, having an inner diameter of the same diameter as the insertion hole. It is integrally formed on the upper surface of the disk-shaped flat surface portion of the lower case at a predetermined radial distance from the cylindrical portion and cooperates with the upper surface of the disk-shaped flat surface portion of the lower case. So as to form an annular concave portion, and the circular shape of the lower case at a predetermined distance radially outward from the cylindrical protrusion so as to form an annular groove in cooperation with the cylindrical protrusion. The upper case includes a cylindrical engaging protrusion formed integrally with an outer peripheral edge of the plate-like flat portion and an engaging portion formed on a lower end outer peripheral surface of the cylindrical engaging protrusion. The end of the portion is radially overlapped with the end of the cylindrical protruding portion, the engaging hook portion is elastically attached to the engaging portion, and is combined with the lower case.

According to the synthetic resin thrust slide bearing of the ninth aspect, in the upper case, the end of the cylindrical hanging portion is radially overlapped with the end of the cylindrical protruding portion of the lower case, and the engaging hook portion is formed. Is elastically attached to the engaging portion of the lower case and is combined with the lower case, so that the elastic mounting portion of the overlapping portion of the cylindrical hanging portion and the cylindrical protruding portion and the engaging hook portion and the engaging portion is As a result of the sealed portion formed by the labyrinth action, foreign matter such as dust is prevented from entering between the upper and lower cases.

According to the synthetic resin thrust sliding bearing of the tenth aspect of the present invention, in the synthetic resin thrust sliding bearing of the ninth aspect, the circular hole of the disk has a diameter larger than the outer diameter of the cylindrical portion. The disk has an outer diameter smaller than the inner diameter of the cylindrical protrusion, the upper surface of which is the lower surface of the disk-shaped flat surface of the upper case, and the lower surface of which is the lower case. The upper surface of the disk-shaped flat portion is slidably contacted with the upper surface of the disk-shaped flat portion, and the upper and lower cases are arranged.

According to the synthetic resin thrust slide bearing of the eleventh aspect of the present invention, in the synthetic resin thrust slide bearing according to any one of the first to sixth aspects, the upper case has a circular hole in the central portion. A disc-shaped flat surface portion, a first cylindrical hanging portion integrally formed on the lower surface of the disc-shaped flat surface portion with an inner diameter having the same diameter as the circular hole of the disc-shaped flat surface portion, and the first cylindrical hanging portion. A second cylindrical hanging portion integrally formed on the lower surface of the disk-shaped flat surface portion with a predetermined distance radially outward from the outer peripheral surface, and an annular groove in cooperation with the second cylindrical hanging portion. As is formed, a cylindrical engaging hanging portion integrally formed with the outer peripheral edge of the disk-shaped flat surface portion at a predetermined distance radially outward from the second cylindrical hanging portion, and the cylindrical engaging hanging portion. The lower case has the same diameter as the circular hole of the upper case in the center part. A disk-shaped flat surface portion having a through hole, and a first cylindrical projection portion integrally formed on the upper surface of the disk-shaped flat surface portion of the lower case radially outward from the insertion hole via an annular shoulder portion. And the first cylindrical protrusion and the disc of the lower case, which are integrally formed on the upper surface of the disk-shaped flat portion of the lower case at a predetermined distance radially outwardly from the first cylindrical protrusion. A second cylindrical protrusion that cooperates with the upper surface of the circular flat portion to form an annular recess, and forms an annular groove in cooperation with the second cylindrical protrusion and the upper surface of the disc-shaped planar portion of the lower case. As described above, a cylindrical engagement protrusion formed integrally with the outer peripheral surface of the second cylindrical protrusion at the outer peripheral edge of the disk-shaped flat surface portion of the lower case at a predetermined distance radially outwardly, And an engaging portion formed on the outer peripheral surface of the lower end of the cylindrical engaging protruding portion, wherein the upper case has an end portion of the first cylindrical hanging portion of the first cylindrical protruding portion. Part and the radial direction, the end of the second cylindrical hanging part is overlapped with the end of the second cylindrical projecting part in the radial direction, and the engaging hook part is elastically attached to the engaging part and combined with the lower case. It becomes.

According to the thrust slide bearing made of synthetic resin of the eleventh aspect, in the upper case, the end portion of the first cylindrical hanging portion is radially aligned with the end portion of the first cylindrical protruding portion of the lower case. (2) The ends of the hanging parts of the cylinders are radially overlapped with the ends of the second cylindrical protrusions of the lower case, respectively, and the engaging hook parts are elastically attached to the engaging parts of the lower case, and combined with the lower case. Therefore, the overlapping portion of the first cylindrical hanging portion and the first cylindrical protrusion,
As a result of the sealing portion formed by the labyrinth action in the overlapping portion of the second hanging portion of the second cylinder and the protruding portion of the second cylinder and the elastic mounting portion of the engaging hook portion and the engaging portion, foreign matter such as dust is present between the upper and lower cases. Is further prevented.

According to the twelfth aspect of the synthetic resin thrust slide bearing of the present invention, in the synthetic resin thrust slide bearing of the eleventh aspect, the circular hole of the disk is the outer diameter of the first cylindrical protrusion. The disk has an outer diameter smaller than the inner diameter of the second cylindrical protrusion, and its upper surface is the lower surface of the disk-shaped flat surface portion of the upper case and its lower surface is The upper case and the lower case are arranged in sliding contact with the upper surface of the disk-shaped flat surface portion of the lower case.

According to the synthetic resin thrust sliding bearing of the thirteenth aspect of the present invention, in the synthetic resin thrust sliding bearing of any one of the first to sixth aspects, the upper case has a circular hole in the central portion. The disk-shaped flat surface portion, the first cylindrical hanging portion integrally formed on the lower surface of the disk-shaped flat surface portion with the same inner diameter as the circular hole of the disk-shaped flat surface portion, and the diameter of the first cylindrical hanging portion. A second cylindrical hanging part that is integrally formed on the lower surface of the disk-shaped flat surface part at a predetermined distance outward in the direction and cooperates with the outer peripheral surface of the first cylindrical hanging part to form an annular groove; , The second cylindrical hanging portion and the lower surface of the disc-shaped flat surface portion which are integrally formed on the lower surface of the disc-shaped flat surface portion at a predetermined distance radially outwardly, and cooperate with the second cylindrical hanging portion and the lower surface of the disc-shaped flat surface portion. And a third cylindrical hanging part that forms an annular recess,
Formed integrally with the third cylindrical hanging portion so as to form an annular groove on the outer peripheral edge of the disk-shaped flat surface portion at a predetermined distance radially outward from the third cylindrical hanging portion. A cylindrical engaging hanging part and an engaging hook part formed on an inner peripheral surface of an end of the cylindrical engaging hanging part, and the lower case has the same diameter as the circular hole of the upper case in the central part. And a first cylindrical protrusion integrally formed on the upper surface of the disk-shaped flat surface portion of the lower case radially outward from the insertion hole via an annular shoulder portion. Part, and the first cylindrical protrusion part, which are integrally formed on the upper surface of the disk-shaped flat surface part of the lower case at a predetermined distance radially outwardly, and cooperate with the first cylindrical protrusion part to form an annular shape. And a second cylindrical protrusion that forms the groove of the lower case, and the second cylindrical protrusion are integrally formed on the upper surface of the disk-shaped flat surface portion of the lower case radially outward at a predetermined interval. A third cylindrical protrusion that cooperates with the second cylindrical protrusion and the upper surface of the disk-shaped flat surface of the lower case to form an annular recess, and an annular shape that cooperates with the third cylindrical protrusion. A cylindrical engaging protrusion integrally formed on the outer peripheral edge of the disk-shaped flat surface portion of the lower case at a predetermined distance radially outward from the third cylindrical protrusion so as to form a groove; And an engaging portion formed on the outer peripheral surface of the lower end of the cylindrical engaging protruding portion, wherein the upper case has first end portions of the first cylindrical hanging portion and the second cylindrical hanging portion. And the end portions of the second cylindrical protruding portion and the end portions of the third cylindrical hanging portions are respectively overlapped with the end portions of the third cylindrical protruding portion in the radial direction thereof, and the engaging hook portions are elastically attached to the engaging portions. Let it be combined with the lower case.

According to the synthetic resin thrust plain bearing of the thirteenth aspect, in the upper case, the ends of the first cylindrical hanging part and the second cylindrical hanging part are connected to the first cylindrical projecting portion of the lower case and the second cylindrical hanging part. The respective end portions of the second cylindrical projecting portion and the end portions of the third cylindrical hanging portion are respectively overlapped with the end portions of the third cylindrical projecting portion of the lower case in the radial direction thereof, and the engaging hook portions are formed in the lower case. Since it is elastically attached to the engaging part of the above and is combined with the lower case, the overlapping part of the first cylindrical hanging part and the first cylindrical protruding part, and the overlapping part of the second cylindrical hanging part and the second cylindrical hanging part. As a result of forming the sealing portion by the labyrinth action in the overlapping portion of the third cylindrical hanging portion and the third cylindrical protruding portion and the elastic mounting portion of the engaging hook portion and the engaging portion, dust or the like is formed between the upper and lower cases. Intrusion of foreign matter is further prevented.

According to the synthetic resin thrust sliding bearing of the fourteenth aspect of the present invention, in the synthetic resin thrust sliding bearing of the thirteenth aspect, the circular hole of the disk is the outer diameter of the second cylindrical protrusion. The disk has an outer diameter smaller than the inner diameter of the third cylindrical protrusion, and the upper surface of the disk is the lower surface of the disk-shaped flat surface of the upper case and the lower surface thereof is The upper case and the lower case are arranged in sliding contact with the upper surface of the disk-shaped flat surface portion of the lower case.

In the thrust slide bearings made of synthetic resin according to the ninth to fourteenth aspects, the upper and lower cases are also made by elastically mounting the engaging hook portions of the upper case to the engaging portions of the lower case. Since they are combined with each other, their assembling work can be performed very easily.

According to the synthetic resin thrust slide bearing of the fifteenth aspect of the present invention, in the synthetic resin thrust slide bearing according to any one of the seventh to fourteenth aspects, the lower case has the insertion hole at the lower surface thereof. It has a cylindrical portion integrally formed with an inner diameter of the same diameter.

According to the synthetic resin thrust slide bearing of the fifteenth aspect, when the thrust slide bearing is attached to the mounting member, the thrust slide bearing is inserted into the mounting hole formed in the mounting member in the cylindrical portion. Therefore, the mounting work becomes extremely easy.

The invention and its embodiments will now be described with reference to the preferred examples shown in the figures. The present invention is not limited to these examples.

[0036]

1 to 4, a synthetic resin thrust sliding bearing 1 according to a first embodiment of the present invention includes an upper case 100 made of synthetic resin, and a lower case 200 made of synthetic resin. The upper case 100 is provided with a synthetic resin bearing piece 300 disposed between the upper and lower cases 100 and 200, and the upper case 100 has a disk-shaped flat surface portion 102 having a circular hole 101 in the central portion thereof and the circular shape. A cylindrical engaging hanging portion 103 integrally formed on the outer peripheral edge of the plate-like flat portion 102 and the cylindrical engaging hanging portion 10
3, the lower case 200 is provided with an engaging hook portion 104 formed on the inner peripheral surface of the end portion thereof, and the lower case 200 has a disc-shaped flat surface having an insertion hole 201 having the same diameter as the circular hole 101 of the upper case 100 in the central portion. A cylindrical portion 203 integrally formed on the upper surface of the disk-shaped flat portion 202 and having an inner diameter equal to that of the portion 202 and the insertion hole 201, and a predetermined interval radially outward from the cylindrical portion 203. And a cylinder engaging protrusion 205 that is integrally formed on the outer peripheral edge of the disk-shaped flat portion 202 and that cooperates with the cylinder portion 203 and the upper surface of the disk-shaped flat portion 202 to form an annular recess 204 and the cylinder. The bearing piece 300 has a circular hole 30 having a diameter larger than the outer diameter of the cylindrical portion 203 of the lower case 200.
1 and is made of a disc having an outer diameter smaller than the inner diameter of the cylindrical engaging protrusion 205, and the bearing piece 300 has a circular hole 301 defined by an inner peripheral surface of the circular plate 301 of the lower case 200. The portion 203 is arranged, the upper surface of which is slidably contacted with the lower surface of the disk-shaped flat surface portion 102 of the upper case 100 and the lower surface thereof is slidably contacted with the upper surface of the disk-shaped flat surface portion 202 of the lower case 200. , The upper case 100 is elastically mounted to the engaging portion 206 of the lower case 200, and the upper case 100 is combined with the lower case 200.

The bearing piece 300 has an upper surface 302, a lower surface 302,
303 has one end open to the circular hole 301 and the other end has an outer peripheral surface 3
A plurality of radial grooves 305 opened at 04 and arranged at equal intervals in the circumferential direction and divided by the radial grooves 305;
06 and 307 are provided with a recess 312 surrounded by flat surface portions 308, 309, 310 and 311 which are flush with the respective divided surfaces 306 and 307.

As shown in FIGS. 3 and 4, the recess 312 has flat surface portions 310 and 311 facing the inner peripheral edges of one of the flat surface portions 308 and 309 and the inner peripheral edges of one of the flat surface portions 308 and 309. The concave curved surface is so defined that the depth gradually increases from the other inner peripheral edge to the central portion.

A plurality of radial grooves 305 formed on the upper and lower surfaces 302 and 303 of the bearing piece 300 and the upper and lower surfaces 30.
A lubricant 312 is filled in the recesses 312 formed on the respective divided surfaces 306 and 307 of the reference numeral 2303 and defined by the concave curved surfaces.

In the thrust slide bearing 1 made of synthetic resin described above, the bearing piece 300 arranged between the upper and lower cases 100 and 200 has one end opened to the circular hole 301 on the lower surfaces 302 and 303, and the other. In addition to having a plurality of radial grooves 305 whose ends open to the outer peripheral surface 304 and are arranged at equal intervals in the circumferential direction, and which are divided by the radial grooves 305,
Each of the lower surfaces 302 and 303 is provided with a recess 312 defined by a concave curved surface surrounded by the flat surface portions 308, 309, 310 and 311 on the respective divided surfaces 306 and 307, and these flat surface portions 308 under the thrust load. , 309, 31
Since 0 and 311 are the actual sliding surfaces, the load (contact pressure) per unit contact area of the sliding surfaces is increased, and
Lubricating oil such as grease is filled in the recess 312 formed on the plurality of radial grooves 305 and the respective divided surfaces 306 and 307 of the upper and lower surfaces 302 and 303 and defined by the concave curved surface, and the actual sliding is performed. Flat surface portions 308, 309, 31 to be surfaces
Since 0, 311 is always provided with the lubricant, the friction coefficient can be reduced, and the stick-slip phenomenon does not occur, and the friction noise caused by the stick-slip phenomenon does not occur.

In the synthetic resin thrust plain bearing 1 having the above-mentioned structure, the upper and lower cases 100,
Since the parts 200 are combined with each other by elastically mounting the engaging hook part 104 of the upper case 100 to the engaging part 206 of the lower case 200, the assembling work can be performed very easily.

FIGS. 5 and 6 show another mode of the recesses 312 formed in the upper and lower surfaces 302, 303 of the bearing piece 300 on the respective dividing surfaces 306, 307. Recess 31
2 has a depth gradually increasing from one inner peripheral edge of the flat surface portions 308, 309 and the other inner peripheral edge of the flat surface portions 310, 311 facing the one inner peripheral edge of the flat surface portions 308, 309 to the central portion. It is defined by a conical surface so that it becomes deep. In the recess 312 defined by the conical surface of this aspect,
Lubricating oil such as grease is filled.

Even in the recess 312 formed on each of the divided surfaces 306 and 307 of the upper and lower surfaces 302 and 303 of the bearing piece 300 and defined by the conical surface, the upper and lower surfaces 302 and 303 of the bearing piece 300 are formed. Each of the divided surfaces 306 and 307
It is possible to obtain the same effect as the recess 312 which is defined by the concave curved surface.

FIG. 7 shows another embodiment of the bearing piece 300. The bearing piece 300 has an upper surface 30 and a lower surface 30.
2, 303, an annular groove 313 surrounding the circular hole 301, and a plurality of radial grooves 305 having one end opened to the annular groove 313 and the other end opened to the outer peripheral surface 304 and arranged at equal intervals in the circumferential direction.
And the upper and lower surfaces 302 and 303 are divided by the radial groove 305.
7, a recess 31 surrounded by flat surface portions 308, 309, 310, 311 that are flush with the respective divided surfaces 306, 307.
Equipped with 2.

Also in this bearing piece 300, the upper and lower surfaces 3
The recess 312 formed in each of the divided surfaces 306 and 307 of 02 and 303 includes an inner peripheral edge of one of the flat surface portions 308 and 309 and a flat surface portion 310 facing the inner peripheral edge of one of the flat surface portions 308 and 309. The concave curved surface, or the inner peripheral edge of one of the flat surface portions 308, 309 and the inner peripheral edge of one of the flat surface portions 308, 309 are arranged so that the depth gradually increases from the other inner peripheral edge of 311 to the central portion. It is defined by a conical surface so that the depth gradually increases from the other inner peripheral edge of the facing flat surface portions 310, 311 to the central portion.

Then, the annular grooves 313, the radial grooves 305 and the dividing surfaces 306 formed on the upper and lower surfaces 302 and 303,
Recesses 312 formed in each of 307 are filled with a lubricating oil agent such as grease.

By forming the annular groove 313 on the upper and lower surfaces 302 and 303 of the bearing piece 300 so as to surround the circular hole 301, the flat surface portion 308 which is an actual sliding surface as compared with the bearing piece 300 shown in FIG. , 309, 310, 311 and the annular flat surface portion 314 on the radially inner side of the annular groove 313 have a higher retaining property of the lubricant, and the friction coefficient can be further lowered, and the stick-slip phenomenon does not occur. Friction noise due to the stick-slip phenomenon is not generated.

FIG. 8 shows a synthetic resin thrust slide bearing 1 according to a second embodiment of the present invention. This synthetic resin thrust slide bearing 1 is made of the synthetic resin thrust slide bearing of the first embodiment. In addition to the structure of the thrust plain bearing 1, the lower case 2
A cylindrical portion 207 having the same inner diameter as the insertion hole 201 is integrally formed on the lower surface of the disk-shaped flat portion 202 of No. 00.

On the lower surface of the lower case 200, the cylindrical portion 20
In the thrust slide bearing 1 made of synthetic resin provided with No. 7, the upper spring seat 4 of the coil spring 41 in the strut type suspension assembly as shown in FIG.
When mounting between 2 and the mounting member 44 to which the piston rod 43 of the hydraulic damper is fixed, the mounting becomes simple.

In this case, the synthetic resin thrust slide bearing 1
Circular hole 101 of the upper case 100 and the lower case 200 of
The upper part of the piston rod 43 is inserted into the insertion hole 201 so as to be rotatable in the R direction around the axis O with respect to the upper case 100 and the lower case 200.

In the strut type suspension assembly mounted via the synthetic resin thrust slide bearing 1 as shown in FIG. 9, during steering operation, the coil spring 41 is used to move around the axis O of the upper spring seat 42. The relative rotation in the R direction is smoothly performed by the relative rotation of the lower case 200 with respect to the upper case 100 in the same direction.

According to the thrust slide bearing 1 made of synthetic resin, the bearing piece 300 disposed between the upper and lower cases 100 and 200 has the lower surfaces 302 and 303, one end of which opens into the circular hole 301. , A plurality of radial grooves 305 having the other end opened to the outer peripheral surface 304 and arranged at equal intervals in the circumferential direction, and being divided by the radial grooves 305,
The lower surfaces 302 and 303 are provided with recesses 312 defined by concave curved surfaces surrounded by flat surface portions 308, 309, 310 and 311 on the respective divided surfaces 306 and 307, and these flat surface portions 308 are provided under a thrust load. , 309, 31
Since 0 and 311 are the actual sliding surfaces, the load (contact pressure) per unit contact area of the sliding surfaces is increased, and
Lubricating oil such as grease is filled in the recess 312 formed on the plurality of radial grooves 305 and the respective divided surfaces 306 and 307 of the upper and lower surfaces 302 and 303 and defined by the concave curved surface, and the actual sliding is performed. Flat surface portions 308, 309, 31 to be surfaces
Since 0, 311 is always provided with the lubricant, the friction coefficient can be lowered, and the stick-slip phenomenon does not occur, so that the friction noise caused by the stick-slip phenomenon can be eliminated and the strut can be eliminated. Smooth steering operation can be ensured even if it is incorporated in the model suspension assembly.

FIG. 10 shows a synthetic resin thrust slide bearing 1 according to a third embodiment of the present invention. The synthetic resin thrust slide bearing 1 is a synthetic resin upper case 10.
0, a lower case 200 made of synthetic resin, and a bearing piece 3 made of synthetic resin arranged between the upper and lower cases 100, 200.
00, the upper case 100 has a disk-shaped flat surface portion 102 having a circular hole 101 in the central portion and the circular hole 101.
The cylindrical hanging part 105 is integrally formed on the lower surface of the disk-shaped flat surface part 102 at a predetermined distance radially outward from the peripheral edge of the circular hanging part 105 and the cylindrical hanging part 105 forms an annular groove 106. As described above, the cylindrical engaging portion 103 and the cylindrical engaging portion 103 are integrally formed on the outer peripheral edge of the disk-shaped flat surface portion 102 at a predetermined distance in the radial direction from the cylindrical hanging portion 105.
The lower case 200 is provided with an engaging hook portion 104 formed on the inner peripheral surface of the end thereof, and the lower case 200 has a disk-shaped flat surface portion having an insertion hole 201 of the same diameter as the circular hole 101 of the upper case 100 in the central portion. 202 and a cylindrical portion 203 integrally formed on the upper surface of the disk-shaped flat portion 202 and having an inner diameter equal to that of the insertion hole 201, and the cylindrical portion 203 at a predetermined distance in a radially outward direction. The annular recess 2 cooperates with the upper surface of the disk-shaped flat portion 202.
And a cylindrical protrusion 208 that forms 04.
So as to form an annular groove 209 in cooperation with the cylindrical protrusion 208, a cylindrical member integrally formed on the outer peripheral edge of the disk-shaped flat surface portion 202 at a predetermined distance radially outward. The bearing piece 300 includes a mating protrusion 205 and an engaging portion 206 formed on the outer peripheral surface of the lower end of the cylindrical engaging protrusion 205.
It is composed of a circular plate having a circular hole 301 having a diameter larger than the outer diameter of the cylindrical portion 203, and having an outer diameter smaller than the inner diameter of the cylindrical protruding portion 208. A plurality of radial grooves 305, which are open to the holes 301 and open at the other end to the outer peripheral surface 304 and are equidistantly arranged in the circumferential direction, are provided on the dividing surfaces 306 and 307 divided by the radial grooves 305. Flat surface portions 308, 309, 31
The bearing piece 300 has a recess 312 surrounded by 0 and 311. The bearing piece 300 has the cylindrical portion 203 arranged in a circular hole 301 defined by the inner peripheral surface thereof, and the upper surface 302 of the bearing portion 300.
And the lower surface 303 of the disk-shaped flat portion 102 of No. 00 is slidably contacted with the upper surface of the disk-shaped flat portion 202 of the lower case 200, respectively, and is arranged between the upper and lower cases 100 and 200. The upper case 100 has a cylindrical hanging portion 10
5 end of the lower case 200 is overlapped with the end of the cylindrical protrusion 208 of the lower case 200 in the radial direction, and the engaging hook part 104 is elastically attached to the engaging part 206 of the lower case 200 to be combined with the lower case 200. Has been done.

In the thrust slide bearing 1 made of synthetic resin according to the third embodiment described above, the upper case 100 has the cylindrical protrusion 105 at the end of the cylindrical hanging portion 105.
08, the engaging hook portion 104 is elastically attached to the engaging portion 206 of the lower case 200 so as to be radially overlapped with the end portion of 08.
By being combined with the lower case 200, a sealing portion by a labyrinth action is formed in the overlapping portion of the cylindrical hanging portion 105 and the cylindrical protruding portion 208 and the elastic mounting portion of the engaging hook portion 104 and the engaging portion 206. Therefore, foreign matter such as dust is prevented from entering between the upper and lower cases 100 and 200.

In the synthetic resin thrust sliding bearing 1 of the third embodiment, the bearing piece 300 has the same structure as the synthetic resin thrust sliding bearing of the first embodiment.
The lower surfaces 302 and 303 are provided with a plurality of radial grooves 305, one end of which is opened to the circular hole 301 and the other end of which is opened to the outer peripheral surface 304, and which are arranged at equal intervals in the circumferential direction. The divided upper and lower surfaces 302 and 303 have respective flat surfaces 308 and 309 on the respective split surfaces 306 and 307.
A recess 31 defined by a concave curved surface surrounded by 310 and 311
2, the flat surface portions 308, 309, 310, 311 become actual sliding surfaces under a thrust load, so that the load (contact pressure) per unit contact area of the sliding surface is increased. And a plurality of radial grooves 305
And the respective dividing surfaces 306, 3 of the upper and lower surfaces 302, 303
The recess 312 formed in 07 and defined by the concave curved surface is filled with a lubricating oil agent such as grease, and the flat surface portions 308, 309, 310, 311 which are the actual sliding surfaces are always filled with the lubricating oil agent. Therefore, not only the coefficient of friction can be lowered, but also the stick-slip phenomenon does not occur, and the friction noise caused by the stick-slip phenomenon does not occur.

FIG. 11 shows a synthetic resin thrust sliding bearing 1 according to the fourth embodiment of the present invention. The synthetic resin thrust sliding bearing 1 is made of synthetic resin upper case 10.
0, a lower case 200 made of synthetic resin, and a bearing piece 3 made of synthetic resin arranged between the upper and lower cases 100, 200.
00, the upper case 100 has a disk-shaped flat surface portion 102 having a circular hole 101 in the central portion and the circular hole 101.
And a first cylindrical hanging portion 107 integrally formed on the lower surface of the disk-shaped flat surface portion 102 with an inner diameter equal to the outer circumferential surface of the first cylindrical hanging portion 107 and a predetermined distance radially outward. The second cylindrical hanging portion 105 is integrally formed on the lower surface of the disc-shaped flat surface portion 102, and the second cylindrical hanging portion 105 is formed so as to form an annular groove 106 in cooperation with the second cylindrical hanging portion 105. And the disk-shaped flat surface portion 102 at a predetermined distance outward in the radial direction.
The lower case 200 is provided with a cylindrical engaging hanging portion 103 integrally formed on the outer peripheral edge thereof and an engaging hook portion 104 formed on an inner peripheral surface of an end portion of the cylindrical engaging hanging portion 103. And a disk-shaped flat portion 202 having an insertion hole 201 having the same diameter as the circular hole 101 of the upper case 100 and the insertion hole 201.
A first cylindrical protrusion 211 that is integrally formed on the upper surface of the disk-shaped flat portion 202 and is radially outwardly separated from the first cylindrical protrusion 211 by an annular shoulder 210. Are integrally formed on the upper surface of the disk-shaped flat surface portion 202 with a space of, between the first cylindrical protrusion 211 and the disk-shaped flat surface portion 20.
The second cylindrical protrusion 212, which cooperates with the upper surface of 2 to form the annular recess 204, and the second cylindrical protrusion 212, and the upper surface of the disk-shaped flat portion 202, form the annular groove 209. As described above, the cylindrical engaging protrusion 205 and the cylinder which are integrally formed with the outer peripheral surface of the second cylindrical protrusion 212 at a predetermined distance radially outward from the outer peripheral edge of the disk-shaped flat portion 202. The bearing piece 300 is provided with a circular hole 301 having a diameter larger than the outer diameter of the first cylindrical protrusion 211 of the lower case 200. A circular plate having an outer diameter smaller than the inner diameter of the second cylindrical protruding portion 212, and one end of the lower surface 302, 303 is opened to the circular hole 301, and the other end is opened to the outer peripheral surface 304. And a plurality of radial grooves 305 arranged at equal intervals in the circumferential direction.
And the flat surfaces 308 and 30 on the respective split surfaces 306 and 307 that are split by the radial groove 305.
The bearing piece 300 has a recess 312 surrounded by 9, 310, and 311. The bearing piece 300 has a circular hole 3 defined by its inner peripheral surface.
01, the first cylindrical protrusion 211 is arranged on the upper surface 302
On the lower surface of the disk-shaped flat portion 102 of the upper case 100,
The lower surface 303 is connected to the disk-shaped flat surface portion 2 of the lower case 200.
The upper and lower cases 100, which are in sliding contact with the upper surface of 02,
It is arranged between 200 and the upper case 100
Is the end of the first cylindrical hanging portion 107,
The end portion of the second cylindrical hanging portion 105 and the end portion of the second cylindrical protruding portion 212 of the lower case 200 are overlapped in the radial direction with the end portion of the first cylindrical protruding portion 211 and the engaging hook, respectively. The portion 104 is elastically attached to the engaging portion 206 of the lower case 200 and is combined with the lower case 200.

In the thrust slide bearing 1 made of synthetic resin according to the fourth embodiment described above, the upper case 100 has the end portion of the first cylindrical hanging portion 107 and the end portion of the first cylindrical protruding portion 211 of the lower case 200. And the second cylindrical hanging part 10 in the radial direction.
The end of 5 is the second cylindrical protrusion 212 of the lower case 200.
And the engaging hook portion 104 is elastically attached to the engaging portion 206 of the lower case 200.
By being combined with the lower case 200, a sealing portion by a labyrinth action is provided on the inner peripheral surface side of the thrust slide bearing 1 at the overlapping portion of the first cylindrical hanging portion 107 and the first cylindrical protruding portion 211 of the lower case 200. The second cylindrical hanging portion 105 and the lower case 2 are provided on the outer peripheral surface side of the thrust slide bearing 1.
00 and the engaging hook portion 104 and the elastic mounting portion of the engaging portion 206 are respectively formed with the sealing portions by the labyrinth action, so that the upper and lower case 1
Invasion of foreign matter such as dust is prevented between 00 and 200.

Also in the synthetic resin thrust sliding bearing 1 of the fourth embodiment, the bearing piece 300 is the same as the synthetic resin thrust sliding bearing of the first to third embodiments.
In addition, one end of the circular hole 301 is formed on the lower surface 302, 303.
A plurality of radial grooves 305 that are open at the other end and open at the other end to the outer peripheral surface 304 and are arranged at equal intervals in the circumferential direction, and the upper and lower surfaces 30 divided by the radial grooves 305.
The flat surface portion 3 is formed on each of the divided surfaces 306 and 307 of the reference numerals 2, 303.
It is provided with a recess 312 defined by a concave curved surface surrounded by 08, 309, 310, 311 and these flat surface portions 308, 309, 310, 311 under a thrust load.
Is the actual sliding surface, the load (contact pressure) per unit contact area of the sliding surface is increased, and the plurality of radial grooves 305 and the respective divided surfaces of the upper and lower surfaces 302 and 303 are The recess 312 formed in 306, 307 and defined by the concave curved surface is filled with a lubricating oil agent such as grease, and the flat surface portions 308, 309, 310, 311 serving as actual sliding surfaces are formed.
Since the lubricating oil agent is always present in the, the friction coefficient can be lowered, and the stick-slip phenomenon does not occur, and the friction noise caused by the stick-slip phenomenon does not occur.

FIG. 12 shows a synthetic resin thrust sliding bearing 1 according to the fifth embodiment of the present invention. The synthetic resin thrust sliding bearing 1 is made of synthetic resin upper case 10.
0, a lower case 200 made of synthetic resin, and a bearing piece 3 made of synthetic resin arranged between the upper and lower cases 100, 200.
00, the upper case 100 has a disk-shaped flat surface portion 102 having a circular hole 101 in the central portion and the circular hole 101.
And a first cylindrical hanging portion 107 integrally formed on the lower surface of the disk-shaped flat surface portion 102 with the same inner diameter as the first cylindrical hanging portion 107. The first cylindrical hanging portion 10 is integrally formed on the lower surface of the flat portion 102.
7 and the second cylindrical hanging portion 109 that forms an annular groove 108 in cooperation with the outer peripheral surface of the circular cylindrical flat portion 102 and the second cylindrical hanging portion 109 at a predetermined distance in the radial outward direction. A third cylindrical hanging part 105 and a third cylindrical hanging part 105 which are integrally formed on the lower surface and cooperate with the second cylindrical hanging part 109 and the lower surface of the disk-shaped flat surface part 102 to form a wide annular concave groove 110. So as to form an annular groove 106 in cooperation with the third cylindrical hanging portion 105, the third cylindrical hanging portion 105 is formed integrally with the outer peripheral edge of the disk-shaped flat surface portion 102 at a predetermined distance radially outward. The lower case 2 includes a cylindrical engaging hanging portion 103 and an engaging hook portion 104 formed on an inner peripheral surface of an end portion of the cylindrical engaging hanging portion 103.
Reference numeral 00 denotes a disk-shaped flat surface portion 202 having an insertion hole 201 having the same diameter as the circular hole 101 of the upper case 100 in the central portion, and a circular portion separated from the insertion hole 201 radially outward through an annular shoulder portion 210. A first cylindrical protruding portion 211 integrally formed on the upper surface of the plate-shaped flat portion 202, and a first cylindrical protruding portion 211 integrally formed on the upper surface of the disk-shaped flat portion 202 with a predetermined radial distance therebetween. And a second cylindrical protrusion 214 that forms an annular groove 213 in cooperation with the first cylindrical protrusion 211, and a second cylindrical protrusion 214 and a diameter on the upper surface of the disk-shaped flat portion 202. And a third cylindrical protrusion 212 that is integrally formed outwardly in the direction at a predetermined interval and that cooperates with the second cylindrical protrusion 214 and the upper surface of the disk-shaped flat portion 202 to form an annular recess 204. To cooperate with the third cylindrical protrusion 212 to form the annular groove 209; (3) A cylindrical engaging protrusion 205 formed integrally with the outer peripheral edge of the disk-shaped flat portion 202 at a predetermined distance radially outward from the cylindrical protruding portion 212, and a lower end outer circumference of the cylindrical engaging protrusion 205. The bearing piece 300 has a circular hole 301 having a diameter larger than the outer diameter of the second cylindrical protrusion 214 of the lower case 200. Of a circular plate having an outer diameter smaller than the inner diameter of the third cylindrical projecting portion 212, and one end of each of the lower surfaces 302 and 303 is opened to the circular hole 301 and the other end is opened to the outer peripheral surface 304. A plurality of radial grooves 305 arranged at equal intervals in the circumferential direction are provided and the radial grooves 3 are provided.
Each of the divided surfaces 306, 307 divided by 05 has a recess 312 surrounded by flat surface portions 308, 309, 310, 311. The bearing piece 300 has a circular hole defined by an inner peripheral surface. The first and second cylindrical protrusions 211 and 214 of the lower case 200 are arranged on the upper surface 301 of the upper case 30.
2 to the lower surface of the disk-shaped flat portion 102 of the upper case 100, and the lower surface 303 to the upper surface of the disk-shaped flat portion 202 of the lower case 200, respectively.
The upper case 1 is arranged between 00 and 200.
00 is the end of each of the first and second cylindrical hanging parts 107 and 109, the end of each of the first and second cylindrical projecting parts 211 and 214 of the lower case 200, and the third cylindrical hanging part 105.
End portions of the engaging hook portion 104 and the third cylindrical protrusion portion 212 of the lower case 200 in the radial direction.
Is elastically attached to the engaging portion 206 of the lower case 200 and is combined with the lower case 200.

In the synthetic resin thrust plain bearing 1 according to the fifth embodiment described above, the upper case 100 is such that the respective ends of the first, second and third cylindrical hanging parts 107, 109 and 105 are lower cases. The first, second and third cylindrical protrusions 211, 214 and 212 of the upper casing 200 and the radial direction thereof are overlapped with each other, and the engaging hook portion 104 is elastically attached to the engaging portion 206 of the lower case 200. By being combined with the lower case 200, the first and second cylindrical hanging parts 107, 10 are provided on the inner peripheral surface side of the synthetic resin thrust plain bearing 1.
9 and the first and second cylindrical protrusions 21 of the lower case 200
1, a sealing portion by a labyrinth action in the overlapping portion with 214, and an overlapping portion of the third cylindrical hanging portion 105 and the third cylindrical protruding portion 212 of the lower case 200 on the outer peripheral surface side of the synthetic resin thrust slide bearing 1. Engaging hook portion 104 and engaging portion 2
Since the sealing portions by the labyrinth action are respectively formed in the elastic mounting portion with 06, foreign matter such as dust is prevented from entering between the upper and lower cases 100 and 200.

Also in the synthetic resin thrust sliding bearing 1 of the fifth embodiment, the bearing piece 300 is the same as the synthetic resin thrust sliding bearing of the first to fourth embodiments.
In addition, one end of the circular hole 301 is formed on the lower surface 302, 303.
A plurality of radial grooves 305 that are open at the other end and open at the other end to the outer peripheral surface 304 and are arranged at equal intervals in the circumferential direction, and the upper and lower surfaces 30 divided by the radial grooves 305.
The flat surface portion 3 is formed on each of the divided surfaces 306 and 307 of the reference numerals 2, 303.
It is provided with a recess 312 defined by a concave curved surface surrounded by 08, 309, 310, 311 and these flat surface portions 308, 309, 310, 311 under a thrust load.
Is the actual sliding surface, the load (contact pressure) per unit contact area of the sliding surface is increased, and the plurality of radial grooves 305 and the respective divided surfaces of the upper and lower surfaces 302 and 303 are The recess 312 formed in 306, 307 and defined by the concave curved surface is filled with a lubricating oil agent such as grease, and the flat surface portions 308, 309, 310, 311 serving as actual sliding surfaces are formed.
Since the lubricating oil agent is always present in the, the friction coefficient can be lowered, and the stick-slip phenomenon does not occur, and the friction noise caused by the stick-slip phenomenon does not occur.

In addition to the structure of the synthetic resin thrust slide bearing 1 of the third, fourth and fifth embodiments described above, the lower part is also provided like the synthetic resin thrust slide bearing 1 of the second embodiment. On the lower surface of the disk-shaped flat surface portion 202 of the case 200,
A cylindrical portion 207 having the same inner diameter as the insertion hole 201 may be integrally formed.

[0063]

According to the present invention, the bearing piece disposed between the upper and lower cases has a plurality of radial shapes, one end of which is opened in the circular hole and the other end of which is opened in the outer peripheral surface. The groove is provided and is divided by the radial groove, and each of the divided surfaces of the lower surface is provided with a recess surrounded by a flat surface portion, and these flat surface portions become actual sliding surfaces under a thrust load. Therefore, the load (contact pressure) per unit contact area of the sliding surface is increased, and grease or the like is not formed in the plurality of radial grooves and the recesses formed in the respective divided surfaces of the upper and lower surfaces. Since the lubricant is filled and the flat lubricant that is the actual sliding surface is always filled with the lubricant, not only can the coefficient of friction be lowered, but the stick-slip phenomenon does not occur and the stick Friction noise caused by the slip phenomenon is generated. Rukoto is not.

[Brief description of drawings]

FIG. 1 is a sectional view of an example of a preferred first embodiment of the present invention.

FIG. 2 is a plan view of the bearing piece made of synthetic resin shown in FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is a sectional view taken along the line IV-IV of FIG.

5 is a sectional view similar to the line III-III arrow in FIG. 2, showing an example of an embodiment of a recess in the synthetic resin bearing piece shown in FIG.

6 is a sectional view similar to the IV-IV line arrow of FIG. 2, showing an example of an embodiment of a recess in the bearing piece made of synthetic resin shown in FIG. 1.

7 is a plan view of an example of another embodiment of the bearing piece made of synthetic resin shown in FIG.

FIG. 8 is a cross-sectional view of an example of the second preferred embodiment of the present invention.

9 is an explanatory diagram of an example in which the example shown in FIG. 8 is incorporated in a strut suspension.

FIG. 10 is a sectional view of an example of a third preferred embodiment of the present invention.

FIG. 11 is a cross-sectional view of an example of a preferred fourth embodiment of the present invention.

FIG. 12 is a sectional view of an example of a preferred fifth embodiment of the present invention.

FIG. 13 is a cross-sectional view of a conventional synthetic resin thrust bearing.

[Explanation of symbols]

1 Synthetic resin thrust plain bearing 100 synthetic resin upper case 102 Disc-shaped flat surface 103 Cylindrical engagement hanging part 104 Engagement hook part 200 Lower case made of synthetic resin 202 Disc-shaped flat surface 205 Cylindrical engagement protrusion 206 Engagement part 300 Bearing pieces made of synthetic resin 301 circular hole 305 radial grooves 308, 309, 310, 311 Flat surface portion 312 recess

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // B60G 15/06 B60G 15/06 (72) Inventor Ryohei Kaneko 8 Kirihara-cho, Fujisawa-shi, Kanagawa OILES Fujisawa Factory F-term (Reference) 3D001 AA19 BA02 DA08 3J011 AA01 AA12 BA08 BA09 CA01 DA02 PA02 RA03 SC03 SC13 SC15 3J016 AA03 AA06 BB17 CA02 3J017 HA01 3J069 AA50 CC36 DD26

Claims (15)

[Claims] 1. A synthetic resin upper case, a synthetic resin lower case, and a synthetic resin bearing piece disposed between the upper and lower cases, wherein the upper case is elastic to the lower case. A thrust slide bearing made of synthetic resin, which is mounted and combined with a lower case, wherein the bearing piece is composed of a circular plate having a circular hole in the central portion, and one end of which is formed on the lower surface and which is opened to the circular hole. , The other end is provided with a plurality of radial grooves that open to the outer peripheral surface, and the upper surface is divided by the radial grooves, and each of the divided surfaces of the lower surface is provided with a recess surrounded by a flat surface portion, A thrust slide bearing made of synthetic resin, wherein the radial groove and the recess are filled with a lubricant. 2. An upper case made of synthetic resin, a lower case made of synthetic resin, and a bearing piece made of synthetic resin arranged between the upper and lower cases, the upper case being elastic to the lower case. A thrust slide bearing made of synthetic resin, which is mounted and combined with a lower case, wherein the bearing piece is composed of a circular plate having a circular hole in a central portion, and further, an annular groove surrounding the circular hole is formed on a lower surface thereof. A plurality of radial grooves, one end of which is open to the annular groove and the other end of which is open to the outer peripheral surface, and which is divided by the radial groove and has a flat surface portion on each of the lower divided surfaces. A thrust slide bearing made of synthetic resin, which is provided with a recess surrounded by, and wherein the radial groove, the annular groove and the recess are filled with a lubricant. 3. The thrust slide bearing made of synthetic resin according to claim 1, wherein the radial grooves are arranged on the upper and lower surfaces of the bearing piece at equal intervals in the circumferential direction. 4. The recess is formed such that the depth gradually increases from one inner peripheral edge of the flat surface portion and the other inner peripheral edge of the flat surface portion facing the one inner peripheral edge to the central portion. The synthetic resin thrust slide bearing according to any one of claims 1 to 3, which is defined by a curved surface. 5. The recess has a conical shape such that the depth gradually increases from one inner peripheral edge of the flat surface portion and the other inner peripheral edge of the flat surface portion facing the one inner peripheral edge to the central portion. 4. The synthetic resin thrust slide bearing according to claim 1, wherein the thrust slide bearing is defined by a surface. 6. The bearing piece is arranged between the upper and lower cases such that the flat surface portion of the upper surface thereof slidably contacts the upper case and the flat surface portion of the lower surface thereof slidably contacts the lower case, respectively. 5. The thrust slide bearing made of synthetic resin according to any one of 1 to 5. 7. The upper case includes a disk-shaped flat surface portion having a circular hole in a central portion, a cylindrical engagement hanging portion integrally formed on an outer peripheral edge of the disk flat surface portion, and the cylindrical engagement hanging portion. An engaging hook portion formed on an inner peripheral surface of an end portion of the portion, the lower case has a disk-shaped flat surface portion having an insertion hole having the same diameter as the circular hole of the upper case in a central portion, and the insertion portion. A cylindrical portion having an inner diameter equal to that of the hole and formed on the upper surface of the disk-shaped flat surface portion of the lower case, and the circular plate of the lower case spaced apart from the cylindrical portion radially outward by a predetermined distance. The upper case includes the cylindrical engaging protrusion formed integrally with the outer peripheral edge of the flat surface portion, and the engaging portion formed on the outer peripheral surface of the lower end of the cylindrical engaging protrusion. The thrust slide bearing made of synthetic resin according to any one of claims 1 to 6, wherein the thrust elastic bearing is elastically attached to the engaging portion and combined with the lower case. 8. The circular hole of the disc has a diameter larger than the outer diameter of the cylindrical portion, and the disc has an outer diameter smaller than the inner diameter of the cylindrical engaging protrusion. At the same time, the upper surface is slidably contacted with the lower surface of the disk-shaped flat surface portion of the upper case, and the lower surface thereof is slidably contacted with the upper surface of the disk-shaped flat surface portion of the lower case. Item 7. A synthetic resin thrust plain bearing according to Item 7. 9. The upper case has a disk-shaped flat surface portion having a circular hole in the central portion, and the disk-shaped flat surface portion at a predetermined distance radially outward from the peripheral edge of the circular hole of the disk-shaped flat surface portion. A cylindrical hanging part integrally formed on the lower surface of the flat surface part, and the disc with a predetermined interval in the radial direction from the cylindrical hanging part so as to form an annular groove in cooperation with the cylindrical hanging part. The lower case includes a central engaging portion and an engaging hook portion formed on an inner peripheral surface of an end portion of the cylindrical engaging hanging portion. A disk-shaped flat surface portion having an insertion hole of the same diameter as the circular hole of the upper case, and a cylinder having an inner diameter of the same diameter as the insertion hole and formed on the upper surface of the disk-shaped flat surface portion of the lower case. And a circular plate of the lower case, which are integrally formed on the upper surface of the disc-shaped flat surface portion of the lower case at a predetermined distance radially outward from the cylindrical section. A cylindrical protrusion that cooperates with the upper surface of the flat surface portion to form an annular recess and a cylindrical protrusion that cooperates with the cylindrical protrusion to form an annular groove. A cylindrical engaging protrusion formed integrally with an outer peripheral edge of the disk-shaped flat surface portion of the lower case with an interval, and an engaging portion formed on a lower end outer peripheral surface of the cylindrical engaging protrusion. Cage,
The upper case is formed by combining the end of the hanging portion of the cylinder with the end of the protruding portion of the cylinder in the radial direction, elastically mounting the engaging hook portion on the engaging portion, and combining with the lower case. The thrust slide bearing made of synthetic resin according to any one of 6 above. 10. The circular hole of the disc has a diameter larger than the outer diameter of the cylindrical portion, and the disc has an outer diameter smaller than the inner diameter of the cylindrical protrusion, 10. The upper surface and the lower case are arranged between the upper case and the lower case by slidingly contacting the upper surface with the lower surface of the disk-shaped flat section of the upper case and the lower surface with the upper surface of the lower case, respectively. The synthetic resin thrust slide bearing described in 1. 11. The upper case is integrally formed on a lower surface of the disk-shaped flat surface portion with a disk-shaped flat surface portion having a circular hole in the central portion and an inner diameter of the same diameter as the circular hole of the disk-shaped flat surface portion. A first cylindrical hanging part, and a second cylindrical hanging part integrally formed on the lower surface of the disk-shaped flat surface part with a predetermined distance radially outward from the outer peripheral surface of the first cylindrical hanging part. , Integrally with the second cylindrical hanging portion so as to form an annular groove in cooperation with the second cylindrical hanging portion, at a predetermined distance radially outward from the outer peripheral edge of the disk-shaped flat surface portion. A cylindrical engaging hanging portion formed on the, and an engaging hook portion formed on the inner peripheral surface of the end portion of the cylindrical engaging hanging portion,
The lower case has a disk-shaped flat surface portion having an insertion hole having the same diameter as the circular hole of the upper case in the center portion, and an upper surface of the disk-shaped flat surface portion of the lower case through the insertion hole and an annular shoulder portion. A first cylindrical protrusion that is integrally formed so as to be separated outward in the radial direction, and is integrally formed on the upper surface of the disk-shaped flat surface portion of the lower case at a predetermined distance radially outward from the first cylindrical protrusion. A second cylindrical protrusion that forms an annular recess in cooperation with the first cylindrical protrusion and the upper surface of the disk-shaped flat surface of the lower case; and the second cylindrical protrusion and the lower case. The disk-shaped flat surface of the lower case is spaced radially outward from the outer peripheral surface of the second cylindrical projection so as to form an annular groove in cooperation with the upper surface of the disk-shaped flat surface. A cylindrical engaging protrusion integrally formed on the outer peripheral edge of the portion,
The upper case includes an engaging portion formed on a lower end outer peripheral surface of the cylindrical engaging protruding portion, and the upper case has an end portion of the first cylindrical hanging portion and an end portion of the first cylindrical protruding portion in a radial direction. 2. The end of the second cylindrical hanging portion is overlapped with the end of the second cylindrical protruding portion in the radial direction, and the engaging hook portion is elastically attached to the engaging portion, and is combined with the lower case. The thrust slide bearing made of synthetic resin according to any one of 6 above. 12. The circular hole of the disc has a diameter larger than the outer diameter of the first cylindrical protrusion, and the disc has an outer diameter smaller than the inner diameter of the second cylindrical protrusion. And an upper surface of the disk-shaped flat portion of the upper case and a lower surface of the disk-shaped flat portion of the lower case which are slidably contacted with each other. Item 12. A synthetic resin thrust plain bearing according to Item 11. 13. The upper case is integrally formed on the lower surface of the disk-shaped flat surface portion with a disk-shaped flat surface portion having a circular hole in the center and an inner diameter of the same diameter as the circular hole of the disk-shaped flat surface portion. A first cylindrical hanging part, and an outer peripheral surface of the first cylindrical hanging part that is integrally formed on the lower surface of the disk-shaped flat surface part at a predetermined distance radially outward from the first cylindrical hanging part. A second cylindrical hanging part that cooperates to form an annular groove; and a second cylindrical hanging part that is integrally formed on the lower surface of the disk-shaped flat surface part at a predetermined distance radially outward from the second cylindrical hanging part. A third cylindrical hanging part that cooperates with the second cylindrical hanging part and the lower surface of the disk-shaped flat surface part to form an annular recess, and an annular groove is formed in cooperation with the third cylindrical hanging part. A third cylindrical hanging part, which is integrally formed on the outer peripheral edge of the disc-shaped flat surface part at a predetermined distance radially outward from the third cylindrical hanging part, and an inner peripheral surface of an end of the cylindrical engaging hanging part. The lower case includes a disc-shaped flat surface portion having a through hole having the same diameter as the circular hole of the upper case, and the disc-shaped flat surface of the lower case. A first cylindrical protrusion that is integrally formed on the upper surface of the portion so as to be radially outwardly separated from the insertion hole via an annular shoulder portion, and the first cylindrical protrusion is radially outwardly separated from the first cylindrical protrusion by a predetermined distance. And a second cylindrical protrusion that is integrally formed on the upper surface of the disk-shaped flat surface of the lower case and cooperates with the first cylindrical projection to form an annular groove, and the disk-shaped flat surface of the lower case. Is formed integrally with the second cylindrical protrusion on the upper surface of the portion at a predetermined distance in the radially outward direction, and cooperates with the second cylindrical protrusion and the upper surface of the disk-shaped flat portion of the lower case to form an annular shape. A third cylindrical protrusion that forms a recess and a radially outward direction of the third cylindrical protrusion so as to form an annular groove in cooperation with the third cylindrical protrusion. A cylindrical engaging protrusion formed integrally with the outer peripheral edge of the disk-shaped flat surface portion of the lower case at a predetermined interval, and an engaging portion formed on the outer peripheral surface of the lower end of the cylindrical engaging protrusion. The upper case is provided with the respective end portions of the first cylindrical hanging portion and the second cylindrical hanging portion and the respective end portions of the first cylindrical protruding portion and the second cylindrical protruding portion,
The end portion of the third cylindrical hanging portion is overlapped with the end portion of the third cylindrical protruding portion in the radial direction thereof, respectively, and the engaging hook portion is elastically attached to the engaging portion and combined with the lower case. 7. The thrust slide bearing made of synthetic resin according to any one of 1 to 6. 14. The circular hole of the disc has a diameter larger than the outer diameter of the second cylindrical protrusion, and the disc has an outer diameter smaller than the inner diameter of the third cylindrical protrusion. And an upper surface of the disk-shaped flat portion of the upper case and a lower surface of the disk-shaped flat portion of the lower case which are slidably contacted with each other. Item 13. A synthetic resin thrust plain bearing according to Item 13. 15. The synthetic resin according to claim 7, wherein the lower case has a cylindrical portion integrally formed on the lower surface with an inner diameter of the insertion hole. Made thrust plain bearing.