JP2003072336A - Suspension for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strut type suspension for an automobile allowing camber control. SOLUTION: In the suspension for the automobile, a shock absorber 3 has a rod 5 having a piston 6 at its lower end and a cylinder 4 having a fixing part mounted to a tire side of a vehicle. A spiral recessed part 7 or projecting part is formed in the side surface of the rod 5, a ring 8 having a projecting part or recessed part screwed to the recessed part 7 or projecting part in its inner surface is fixed to the upper end of the cylinder 4, the rod 5 is disposed rotatably in response to stroke of the cylinder 4, and a pinion 9 fixed to the upper end of the rod 5 is fitted to a rack 21 disposed at the upper end of an outer cylinder body 17 dampably disposed on the inner surface of an insulator 25 of a car body mounting part via a mount rubber 24, thereby moving the entire shock absorber 3 laterally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle suspension, and more particularly to a strut suspension.

[0002]

2. Description of the Related Art Since strut suspensions have a wider engine room than high mount upper arms and double wishbones, most FF vehicles use strut suspensions for the front suspension. Also, FR vehicles are often used for cost reasons.

A strut type suspension 101 of a conventional example shown in FIG. 3 includes an upper insulator 103 provided on a vehicle body 102 and the upper insulator 10.
The upper insulator 103 is provided with a shock absorber 104 fixed to the outer cylinder portion 105, the outer cylinder portion 105 fixed to the vehicle body 102, the mount rubber 106 provided along the inner side surface of the outer cylinder portion 105, This mount rubber 10
The inner cylinder portion 107 is formed of a bottomed cylinder body that is open upward and is provided inside the inner cylinder 6. This inner cylinder portion 107
The buffer 104 is fixed to the lower surface 108 of the.

The shock absorber 104 is fixed in a state of being in contact with the lower surface 108 of the inner cylindrical portion 107 in the upper cover 1.
11, a coil spring 113 provided on the upper cover 111 via a rubber sheet 112, and a lower cover 114 provided on the lower end of the coil spring 113. A shock absorber 115 is provided inside the coil spring 113. It is provided on the same axis.
The shock absorber 115 has a cylinder 116 fixed in a state of being inserted into the lower cover 114, a rod 117 extending upward from a piston accommodated in the cylinder 116, and an externally fitted state on an upper end side of the rod 117. The guide member 118 is fixed and houses the cylinder 116. The shock absorber 115 is fixed to the upper insulator 103 by fastening a nut 119 to the upper end portion of the rod 117 that passes through the upper cover 111 and the inner cylinder portion 107 of the upper insulator 103. Cylinder 116
At a lower end portion thereof, a fixing portion 120 fixed to an axle beam, a suspension arm, a link or the like (not shown) is provided.

[0005]

However, in all of the strut suspensions up to now, the nuts are attached to the rod 117 through which the upper cover 111 and the inner cylinder portion 107 of the upper insulator 103 are inserted, as in the conventional example described above. Since 119 is fastened and fixed, it is difficult to balance the alignment change, and the tread change and the ground camber change have a trade-off relationship. That is, it is desirable that the lower arm be close to horizontal in order to reduce the tread change,
Then, the change of the outer wheel to the ground camber becomes large at the time of rolling, while on the other hand, if the strut is tilted inward, both the tread change and the ground camber change at the time of rolling can be made small, but then the strut tower will overhang in the engine room. become.

Therefore, an object of the present invention is to solve the above-mentioned problems of the strut system and to provide a strut type vehicle suspension which enables a camber control.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor utilized the linear displacement of the shock absorber in a strut suspension to force the entire shock absorber to move right and left during rolling. It was found that the camber control can be favorably performed by moving it, and the present invention has been completed. That is, the strut type automobile suspension of the present invention is as follows.

<1> An automobile suspension comprising a coil spring and a shock absorber provided inside the coil spring, wherein the shock absorber is a rod having a piston at a lower end thereof.
A suspension for an automobile, comprising: a cylinder having a fixing portion that is inserted into the piston and attached to a tire side of a vehicle; and a recessed portion or a protruding portion is formed spirally on a side surface of the rod, A ring having a convex portion or a concave portion that is screwed into the concave portion or the convex portion formed on the inner side surface is fixed, and the rod is arranged so as to be rotatable with the stroke of the cylinder. The fixed pinion meshes with the rack installed on the upper end of the outer cylindrical body, which is installed on the inner surface of the vehicle body mounting section insulator via the mount rubber, so that the shock absorber as a whole can move in the left-right direction. It is an automobile suspension characterized by being made movable.

<2> In the vehicle suspension according to <1> above, the coil spring is sandwiched between an upper cover provided at an upper end of the suspension and a lower cover provided at a lower end thereof, and is coaxial with the inside of the coil spring. In the vehicle suspension, the lower cover is externally fitted and fixed to a lower end portion of the cylinder of the shock absorber provided above.

<3> In the vehicle suspension of <2>, an inner cylinder is coaxially provided on the upper surface of the upper cover, and an annular shape is formed inside along the inner peripheral edge of the upper end of the inner cylinder. The upper surface of the plate and the lower surface of the annular plate formed inside along the inner peripheral edge of the upper end of the outer tubular body are coaxially connected via a cylindrical guide, and the rod is connected via a radial ball bearing. A suspension for an automobile, which is rotatably supported in an inner cylinder and has stoppers for preventing the rod from moving in the up-down direction in regions of the upper and lower end portions of the radial ball bearing of the rod.

<4> In the vehicle suspension according to <3>, the upper surface of the upper cover and a flange formed at the lower end of the inner cylinder are coaxially rotatable via a thrust ball bearing. It is a connected automobile suspension.

<5> In the vehicle suspension of <3> above, the cylindrical guide is an automobile suspension in which the vibration-proof rubber is a single body or a laminated body of the vibration-proof rubber and a metal plate.

<6> In the vehicle suspension according to <3>, the coil spring is supported by the upper cover via a rubber sheet.

According to the inventions of the above <1> to <6>, the vertical linear displacement due to the stroke of the cylinder of the shock absorber is forcibly changed to the displacement for moving the entire shock absorber left and right while receiving the vertical load. This makes it possible to reduce both the tread change and the ground camber change during rolling without the strut tower projecting into the engine room.

According to the invention of the above <2>, and particularly the invention of the above <6>, the coil spring can perform a good shock absorbing function. According to the invention of <4>,
It is possible to prevent the steering force from becoming heavy during steering.
Further, according to the invention of <5>, the entire shock absorber can be smoothly moved to the left and right.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be specifically described below. FIG. 1 (B) shows a suspension 1 according to an embodiment of the present invention. The suspension 1 has a coil spring 2 and
The shock absorber 3 is provided inside the coil spring 2.

The shock absorber 3 includes a cylinder 4
And a rod 5 extending upward from a piston 6 housed in the cylinder 4, and a pinion 9 is fixed to the upper end of the rod 5 by means such as crimping or screwing.

The coil spring 2 is arranged between the upper cover 12 coaxially provided on the upper end thereof and the lower cover 13 coaxially provided on the lower end thereof, and coaxially provided inside the coil spring 2. The lower cover 13 is attached to the lower end of the cylinder 4 of the shock absorber 3.
Is fitted and fixed. At the lower end of the cylinder 4,
A fixed portion 11 fixed to another member of the suspension such as an axle beam, a suspension arm, a link or an axle (not shown) is provided. The coil spring 2 is locked to a downward curved portion formed on the peripheral portion of the upper cover 12 via the rubber sheet 26, and the rubber sheet 26 can also perform a good shock absorbing function.

An inner cylinder 14 is provided on the upper surface of the upper cover 12.
A flange 15 formed at the lower end of the is coaxially rotatably connected via a thrust ball bearing 22. By making it rotatable in this manner, the entire strut can be smoothly rotated while receiving a vertical load, and it is possible to prevent the steering force from becoming heavy during steering.

The inner cylindrical body 14 has an annular plate 16 formed inside along the inner peripheral edge of the upper end of the inner cylindrical body 14. The upper surface of the annular plate 16 and the inner surface of the vehicle body mounting portion insulator 25 via the mount rubber 24 are vibration-proof. A cylindrical guide 20 movable in the left-right direction is coaxially interposed between the lower surface of an annular plate 19 formed inside along the inner peripheral edge of the upper end of the outer cylinder 17 that is installed so as to be coaxial, As a result, the inner cylindrical body 14 and the outer cylindrical body 17 are connected so as to be movable in the left-right direction. A flange 18 is formed on the outer side along the outer peripheral edge of the lower end of the outer cylindrical body 17, which makes it possible to widen the joint surface by vulcanization adhesion or the like with the mount rubber 24. Also,
The cylindrical guide 20 is preferably made of a vibration-proof rubber alone or a laminated body of a vibration-proof rubber and a metal plate, and by fixing the upper and lower surfaces thereof by vulcanization adhesion or the like, smooth movement in the left-right direction can be performed. You can

In the present invention, a concave portion 7 (or a convex portion (not shown)) is spirally formed on the side surface of the rod 5 as shown in the drawing, and a convex portion screwed into the concave portion 7 is formed at the upper end of the cylinder 4. A ring 8 having an inner surface (or a recess (not shown)) is fixed. As a result, the rod 5 is rotated along with the stroke of the cylinder 4. On the other hand, a rack 21 is erected on the annular plate 19 at the upper end of the outer cylindrical body 17, and the pinion 9 fixed to the upper end of the rod 5 is connected to the rack 21 and the teeth as shown in FIG. They are arranged in a positional relationship that matches. 1A is a plan view of the pinion 9 and the rack 21 of FIG. 1B viewed from above in order to show the positional relationship between the pinion 9 and the rack 21.

The rod 5 is coaxially and rotatably supported by the inner cylindrical body 14 via a radial ball bearing 23 so that the rod 5 can be easily rotated. Further, the rod 5 has stoppers 10 in the upper and lower end outer regions of the radial ball bearing 23 for preventing the rod 5 from moving in the vertical direction. As a result, the rod 5 rotates smoothly and is prevented from moving up and down in conjunction with the vertical movement of the cylinder 4. The rod 5 has a smaller diameter between the upper stopper 10 and the pinion 9 as compared with the lower portion thereof, so that a large amount of lateral movement of the shock absorber 3 can be obtained. It is preferable to secure such a movement amount of about 30 mm in order to perform good camber control.

FIG. 2B shows that the rod 5 rotates with the stroke of the cylinder 4 of the suspension of the preferred embodiment of the present invention shown in FIG. 1, and as a result, the pinion 9 fixed to the upper end of the rod 5 is the outer cylinder. The rack 21 installed on the upper end of the body 17
It is shown that the teeth are meshed with each other and moved rightward as shown in FIG. This makes the shock absorber 3
It is possible to move the whole to the right.

[0024]

As described above, according to the present invention, the vertical linear displacement due to the stroke of the cylinder is forcibly changed into the displacement for moving the entire shock absorber left and right while receiving the vertical load. You can As a result, both the tread change and the ground camber change during roll can be reduced without the strut tower protruding into the engine room, and a strut suspension capable of controlling the camber can be obtained.

[Brief description of drawings]

FIG. 1A is a plan view showing an arrangement relationship between a pinion and a rack. (B) is a cross-sectional view showing a strut suspension which is a preferred example of the present invention.

FIG. 2A is a plan view showing a positional relationship between the pinion and the rack after the shock absorber is moved to the right. (B) is a sectional view showing a strut suspension which is a preferred example of the present invention after the shock absorber has been moved to the right.

FIG. 3 is a cross-sectional view showing a conventional strut suspension.

[Explanation of symbols]

1 suspension 2 coil spring 3 shock absorber 4 cylinders 5 rod 6 pistons 7 recess 8 rings 9 pinion 10 stopper 11 Fixed part 12 Upper cover 13 Lower cover 14 Inner cylinder 15 flange 16 annular plate 17 outer cylinder 18 flange 19 annular plate 20 Cylindrical guide 21 racks 22 Thrust ball bearing 23 radial ball bearings 24 Mount rubber 25 insulator 26 rubber sheet

Claims (6)

[Claims] 1. A suspension for an automobile, comprising: a coil spring; and a shock absorber provided inside the coil spring, wherein the shock absorber comprises a rod having a piston at a lower end thereof and an inner portion of the piston. In a suspension for an automobile, comprising: a cylinder having a fixing portion that is inserted and attached to a tire side of a vehicle, a concave portion or a convex portion is spirally formed on a side surface of the rod, and the concave portion or the convex portion is formed at an upper end of the cylinder. A ring having a convex portion or a concave portion that is screwed to the convex portion is fixedly provided on the inner side surface, the rod is arranged so as to be rotatable with the stroke of the cylinder, and the pinion is fixed to the upper end of the rod. Is mounted on the inner surface of the vehicle body mounting insulator via the mount rubber to prevent vibrations. By rack meshing which is laid on the edge, automotive suspension, characterized in that the entire said shock absorber is made to be movable in the lateral direction. 2. The cylinder of the shock absorber, wherein the coil spring is sandwiched between an upper cover provided at an upper end of the coil cover and a lower cover provided at a lower end of the coil spring and coaxially provided inside the coil spring. The vehicle suspension according to claim 1, wherein the lower cover is externally fitted and fixed to a lower end portion of the vehicle. 3. An inner cylindrical body is coaxially provided on an upper surface of the upper cover, an upper surface of an annular plate formed inside along an inner peripheral edge of an upper end of the inner cylindrical body, and an upper end of the outer cylindrical body. The lower surface of the annular plate formed inside along the inner peripheral edge of is coaxially connected via a cylindrical guide, and the rod is rotatably supported in the inner cylinder via a radial ball bearing, and In the outer region of the upper and lower ends of the radial ball bearing of the rod,
The vehicle suspension according to claim 2, wherein a stopper is installed to prevent the rod from moving in the vertical direction. 4. The automobile according to claim 3, wherein an upper surface of the upper cover and a flange formed at a lower end portion of the inner cylindrical body are coaxially and rotatably connected to each other via a thrust ball bearing. suspension. 5. The vehicle suspension according to claim 3, wherein the cylindrical guide is a vibration-proof rubber alone or a laminated body of a vibration-proof rubber and a metal plate. 6. The vehicle suspension according to claim 3, wherein the coil spring is supported by the upper cover via a rubber sheet.