JP2000291669A - Shell type needle bearing with seal ring - Google Patents

Abstract

(57) [Summary] The amount of lubricating oil that has entered the inner diameter side of the outer ring 2 then flows out from the end opening of the outer ring 2 in accordance with the amount of lubricating oil required on the downstream side and the upstream side. Adjustable. SOLUTION: A first inclined portion 12 having a steep inclination angle is provided on an inner peripheral edge of a seal ring 5 internally fitted and supported at an end of an outer ring 2;
There is also a second inclined portion 13 which is also loose. The positions of the inclined portions 12 and 13 are regulated according to the required amount of lubricating oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A shell-type needle bearing according to the present invention is used in a state where it is incorporated in a rotary support portion which is forcibly lubricated by lubricating oil sent by a pump, such as an automatic transmission for an automobile.

[0002]

2. Description of the Related Art For example, in order to rotatably support a rotating shaft incorporated in an automatic transmission for an automobile with respect to a housing,
A shell type needle bearing with a seal ring is used. A state in which a shell type needle bearing with a seal ring is incorporated in such a rotation supporting portion will be described with reference to FIG. This shell type needle bearing 1 with a seal ring comprises an outer ring 2, a cage 3
And a plurality of needles 4 and a seal ring 5. At both ends of the outer ring 2 which is formed by bending a metal plate so as to have a cylindrical shape as a whole, a part of the metal plate is formed at right angles toward the inside in the diametrical direction (the lower side in FIG. 3 and FIGS. By bending, a pair of holding portions 6 and 6a are formed. Of these two holding portions 6 and 6a, one (right side in FIG. 3 and left side in FIGS. 6 to 7) is formed before the retainer 3 and the needle 4 are assembled. It has substantially the same thickness as the main body portion of. On the contrary,
The other (leftward in FIG. 3, rightward in FIGS. 6 and 7) holding portion 6 a
Since it is formed after assembling the retainer 3 and the needle 4, it is thinner than the main body of the outer race 2. The seal ring 5 is internally fitted and supported at one end (the right end in FIG. 3) of the outer race 2 inside the holding portion 6 formed at this end. Both ends in the axial direction of the retainer 3 are close to the inner surfaces of the seal ring 5 and the holding portion 6a at the other end (the left end in FIG. 3). Therefore, the retainer 3 is rotatable inside the outer ring 2. Each of the plurality of needles 4 is rotatably held one by one inside a plurality of pockets provided in such a retainer 3 in a circumferential direction.

[0003] In the case of the structure shown in FIG. 3 in which the rotary member 8 is supported inside the housing 7 of the automatic transmission by the shell type needle bearing 1 with the seal ring as described above,
Pump housing 9 fixed inside this housing 7
The outer ring 2 is internally fitted and fixed to the inner diameter side of a holding hole 10 formed in a part of the rotating member 8, and a part of the rotating member 8 is inserted into a plurality of needles 4 held by the holder 3. Then, the rolling surface of each of the needles 4 is brought into contact with the outer peripheral surface of the rotating member 8. As a result, a part of the rotating member 8 is rotatably supported inside the pump housing 9. During the operation of the automatic transmission, the lubricating oil discharged from the oil feed pump 11 provided in the pump housing 9 is supplied to each part to lubricate these parts.

As shown in FIGS. 6 and 7, there are conventionally known shell type needle bearings 1 and 1a with seal rings to be incorporated in the above-described portions. Figure 6 of these
In the shell type needle bearing 1 with a seal ring of the first example shown in FIG. 1, the seal ring 5 is provided only at one end (the left end in FIG. 6) of the outer race 2. On the other hand, the second
The example shell-type needle bearing with seal ring 1 a has seal rings 5, 5 at both ends of the outer ring 2.

Conventionally, as a seal ring 5 to be incorporated in each of the shell type needle bearings 1 and 1a with a seal ring, a cross-sectional shape of an inner peripheral edge is triangular, an inner diameter of an intermediate portion in the axial direction is the smallest, and an inclination angle is steep on both sides. One having one inclined portion 12 and a second inclined portion 13 having a gentle inclination angle is used. Such a performance that the seal ring 5 blocks the flow of the fluid is large in the flow from the first inclined portion 12 to the second inclined portion 13 and small in the opposite direction. In the case of the conventional needle needle bearings 1 and 1a with a seal ring, such a seal ring 5 is incorporated with the first inclined portion 12 positioned axially outside the outer ring 2. Therefore, in the case of the conventional shell-type needle bearings 1 and 1a with a seal ring, while a large sealing effect is provided against the flow of the fluid that is going to enter the outer ring 2, the flow of the fluid that is going to flow out of the outer ring 2 Sealing effect was small.

[0006]

When lubricating oil discharged from the oil feed pump 11 (FIG. 3) is fed into each part of an automatic transmission for an automobile to each part requiring lubricating oil, the supply amount is set to each part. Often it is necessary to make it different. For example, in the case of the structure shown in FIG. 3, the amount of the lubricating oil existing on the oil feed pump 11 side (the left side in FIG. 3) with respect to the shell type needle bearing 1 with the seal ring is reduced by the amount of the lubricating oil existing on the opposite side. Need to be more. Although not shown, lubricating oil is discharged from the inner diameter side of the axially intermediate portion of the shell type needle bearing (opening the downstream end of the lubricating oil flow path to the inner ring raceway), and the lubricating oil discharged to the inner diameter side of the outer ring In this case, the amount of lubricating oil flowing out of the opening at one end and the amount of lubricating oil flowing out of the other end need to be different. The above-described conventional shell-type needle bearing with a seal ring cannot meet such a demand. The shell type needle bearing with a seal ring of the present invention has been made in view of such circumstances.

[0007]

A shell type needle bearing with a seal ring according to the present invention has a cylindrical shape as a whole by bending a metal plate similarly to the above-mentioned conventional shell type needle bearing with a seal ring. An outer ring having a restraining portion bent inward in the diametrical direction at each end of the axial direction, and a plurality of pockets extending in the circumferential direction, and a holding member rotatably provided inside the outer ring. Container, a plurality of needles which are rotatably held inside each of the pockets, and a part of each rolling surface is brought into contact with the inner peripheral surface of the outer ring, and the holding is performed by at least one end of the outer ring. And a seal ring internally fitted and supported inside the portion. The inner peripheral edge of the seal ring has a triangular cross-sectional shape, a small-diameter portion having the smallest inner diameter in the axial middle portion, and a gentle inclination angle with the first inclined portion having a steep inclination angle on both axial sides of the small-diameter portion. The second inclined portions are respectively present. Then, the outer ring was internally fitted and fixed to the outer member, and the small-diameter portion formed on the inner peripheral edge of the seal ring was slid over the entire outer peripheral surface of the inner member disposed on the inner diameter side of the outer member. Use in state.

In particular, in the shell type needle bearing with a seal ring of the present invention, the lubricating oil is allowed to flow freely on the inner diameter side of the outer ring, and the disposition position of the first inclined portion is controlled. Is regulated according to the flow direction and flow rate of Preferably, the inclination angle of the first inclined portion with respect to the outer peripheral surface of the inner member is not less than 45 degrees and not more than 75 degrees, and the inclination angle of the second inclined portion is not less than 15 degrees and less than 45 degrees. More preferably, the material of the seal ring is hydrogenated nitrile rubber.

[0009]

According to the shell-type needle bearing with a seal ring of the present invention having the above-described structure, the amount of lubricating oil supplied to each part requiring lubricating oil, such as a plurality of rotary support parts provided in the automatic transmission. Can be easily adjusted. Also, if the seal ring is made of hydrogenated nitrile rubber, the automatic transmission uses traction oil as lubricating oil, for example, as in a toroidal type continuously variable transmission, and even when this lubricating oil becomes hot during use, , Ensuring sufficient oil resistance and heat resistance,
Stable performance can be maintained over a long period of time.

[0010]

1 and 2 show a first embodiment of the present invention. The feature of the present invention is that the first and second inclined portions 12 and 13 formed on the inner peripheral edge of the seal ring are provided.
Is to regulate the supply amount of the lubricating oil to each part that requires the lubricating oil, such as a plurality of rotation supporting parts provided in the automatic transmission, by regulating the arrangement position of the lubricating oil. Since the configuration and operation of the other parts are the same as those of the above-mentioned conventionally known shell-type needle bearing with a seal ring, the description of the equivalent parts is omitted or simplified, and the following description will focus on the characteristic parts of the present invention. explain.

The sectional shape of the inner peripheral edge of the seal ring 5 which is fitted and supported on one end (the left end in FIG. 1) of the outer ring 2 constituting the shell type needle bearing 1 with the seal ring is as shown in FIG. The small-diameter portion 14 having the smallest inner diameter is formed between the small-diameter portion 14 and the first inclined portion 12 having a steep inclination angle with the first inclined portion 12 having a steep inclination angle. A loose second inclined portion 13 is provided. The inclination angle θ ₁ of the first inclined portion 12 with respect to the outer peripheral surface of the rotating member 8 described below, which is an inner member, is set to 45 degrees or more and 75 degrees or less (45 degrees ≦ θ ₁ ≦ 75 degrees). On the contrary,
The inclination angle θ ₂ of the second inclined portion 13 is 15 degrees or more and 45 degrees or more.
Degrees (15 degrees ≦ θ ₂ <45 degrees). In particular, in the case of this example, the first inclined portion 12 is located inside in the axial direction of the outer ring 2. The seal ring 5 is made of hydrogenated nitrile rubber.

The shell type needle bearing 1 with a seal ring as described above, for example, as shown in FIG. 3, is used to support a rotating member 8 inside a housing 7 of an automatic transmission such as a toroidal type continuously variable transmission. use. At this time, as shown in FIG.
The seal ring 5 is arranged at the downstream end (the right end in FIG. 3) of the outer race 2 with respect to the lubricating oil flow direction (the right direction in FIG. 3). When the inner peripheral edge of the seal ring 5 is elastically brought into contact with the outer peripheral surface of the rotating member 8 as described above, the contact pressure between the inner peripheral edge and the outer peripheral surface is as shown by an arrow in FIG. In addition, the height becomes higher inside the outer ring 2 provided with the first inclined portion 12. Therefore, the sealing performance against the flow of the lubricating oil from the inside to the outside of the outer ring 2 is improved.

During operation of the above-described shell needle bearing 1 with a seal ring, the lubricating oil (traction oil) discharged from the oil feed pump 11 enters the inside of the outer ring 2, but is blocked by the seal ring 5. As a result, it does not flow out of the outer ring 2 much. Therefore, the space 15 existing around the pump housing 9 does not require much lubricating oil.
Does not send much lubricating oil, and can send lubricating oil to other spaces that require more lubricating oil. Since the upstream end of the outer ring 2 is not provided with a seal ring,
A sufficient amount of lubricating oil is present in the inside of the housing to lubricate the installation portion of the shell type needle bearing 1 with the seal ring. Also, even if the temperature of the lubricating oil in this part rises,
Since the seal ring 5 made of hydrogenated nitrile rubber has heat resistance in addition to sufficient oil resistance, sufficient durability can be secured.

The shell-type needle bearing with a seal ring 1 of the present embodiment as shown in FIG. 1 lubricates the shell-type needle bearing 1 with a seal ring, and then removes the lubricating oil flowing out from both ends of the outer ring 2. It can also be used to change the flow rate between each other. That is, for example, in the structure of FIG. 3, the lubricating oil is discharged from the inner diameter side of the axially intermediate portion of the shell type needle bearing 1 with the seal ring by forming an oil supply hole in a part of the rotating member 8 (in the inner ring raceway). The downstream end of the lubricating oil passage may be opened). In such a case, the lubricating oil discharged to the inner diameter side of the outer ring 2 flows out downstream from both ends of the outer ring 2. However, if the shell type needle bearing 1 with a seal ring of this example is used, the outer ring 2 Most of the lubricating oil discharged to the inner diameter side of No. 2 can be discharged from the opening where the seal ring 5 is not provided.

FIG. 4 shows a second embodiment of the present invention.
An example is shown. In the case of the shell-type needle bearing 1a with a seal ring of the present embodiment, the seal rings 5, 5 are internally fitted to and supported on both ends of the outer race 2, respectively. Then, the first inclined portions 1 formed on the inner peripheral edge portions of these two seal rings 5, 5
2 and 12 are arranged inside the outer race 2 in the axial direction, respectively. In the case of such a shell type needle bearing with a seal ring 1a of this example, the two seal rings 5, 5 allow a certain amount of the flow of the lubricating oil into the outer ring 2, whereas This prevents the lubricating oil that has entered the outer ring 2 from flowing out. In such a shell-type needle bearing with a seal ring 1a of this example, it is necessary to feed lubricating oil into the outer ring 2, but the lubricating oil is sent from the outer ring 2 to other parts, and is used in a portion where the necessity is low.

FIG. 5 shows a third embodiment of the present invention.
An example is shown. In the case of the shell-type needle bearing 1a with a seal ring of the present embodiment, the seal rings 5, 5 are internally fitted to and supported on both ends of the outer race 2, respectively. Then, the first inclined portions 1 formed on the inner peripheral edge portions of these two seal rings 5, 5
2, 12 are arranged in the same direction with respect to the axial direction. That is, in the case of one (left side in FIG. 5) seal ring 5, the first inclined portion 12 is located outward in the axial direction of the outer ring 2, and in the case of the other (right side in FIG. 5) seal ring 5. Similarly, each is arranged inside. In the case of such a shell-type needle bearing with a seal ring 1a of this example,
In FIG. 5, the sealing effect for the rightward flow is large, while the sealing effect for the leftward flow is small. Such a shell-type needle bearing with a seal ring 1a of the present example has a portion in which the lubricating oil flowing in the axial direction on the inner diameter side of the outer ring 2 needs to be sent to the downstream side little by little while lubricating the bearing 1a.
Alternatively, the lubricating oil discharged from the inner diameter side of the outer ring 2 is incorporated into a portion that needs to be gradually discharged from one opening of the outer ring 2.

[0017]

The shell type needle bearing with a seal ring according to the present invention is constructed and operates as described above, so that the lubricating oil feed amount can be finely adjusted, and the lubrication of an automatic transmission or the like can be achieved. This can contribute to the improvement of the performance of a mechanical device having many parts requiring oil.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG. 1 in a state where an inner peripheral edge of a seal ring is in contact with an outer peripheral surface of a rotating member.

FIG. 3 is a partial cross-sectional view of the automatic transmission, showing an example of a use state.

FIG. 4 is a partial sectional view showing a second example of the embodiment of the present invention.

FIG. 5 is a partial sectional view showing the third example.

FIG. 6 is a partial sectional view showing a first example of a conventional structure.

FIG. 7 is a partial sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Shell type needle bearing with a seal ring 2 Outer ring 3 Cage 4 Needle 5 Seal ring 6, 6a Suppression part 7 Housing 8 Rotary member 9 Pump housing 10 Holding hole 11 Oil feed pump 12 First inclined part 13 Second inclined part 14 Small diameter part 15 Space

Claims (5)

[Claims] 1. An outer ring having a cylindrical shape as a whole formed by bending a metal plate and having restraining portions bent inward in the diametrical direction at both ends in the axial direction, and a plurality of outer rings extending in the circumferential direction. And a retainer rotatably provided inside the outer ring, and a roller rotatably held inside each of the pockets so that a part of each rolling surface is formed on the inner periphery of the outer ring. A plurality of needles to be brought into contact with the surface, and a seal ring internally fitted and supported at least at one end of the outer ring to the inside of the holding portion, and an inner peripheral edge of the seal ring has a triangular cross-sectional shape and an axial intermediate portion. The small diameter part with the smallest inside diameter
A first inclined portion having a steep inclination angle and a second inclined portion having a gentle inclination angle are present on both axial sides of the small diameter portion, and the outer ring is internally fitted and fixed to an outer member, and the seal is provided. The shell type needle bearing with a seal ring used in a state in which the small diameter portion formed on the inner peripheral edge of the ring is slidably contacted on the outer peripheral surface of the inner member arranged on the inner diameter side of the outer member over the entire circumference. A shell type with a seal ring, wherein lubricating oil is allowed to flow freely on the inner diameter side of the outer ring, and the arrangement position of the first inclined portion is regulated according to a flow direction and a flow amount of the lubricating oil to be controlled. Needle bearing. 2. The seal ring according to claim 1, wherein the seal ring is provided only at an upstream end of the outer ring with respect to the flow direction of the lubricating oil, and the first inclined portion is located outside with respect to the axial direction of the outer ring. Shell type needle bearing with seal ring. 3. The seal ring according to claim 1, wherein the seal ring is provided only at a downstream end of the outer race with respect to the flow direction of the lubricating oil, and the first inclined portion is located inside with respect to the axial direction of the outer race. Shell type needle bearing with seal ring. 4. The seal ring according to claim 1, wherein seal rings are provided at both ends of the outer ring, and a second inclined portion of an inner peripheral edge of at least one of the seal rings is located outside in the axial direction of the outer ring. Shell needle bearing with seal ring. 5. The shell needle bearing with a seal ring according to claim 1, wherein the seal ring is made of hydrogenated nitrile rubber.