JPH1035238A - Car stabilizer - Google Patents

Abstract

(57) [Problem] To provide a stabilizer that can be easily attached even when a suspension arm is in a full rebound state. SOLUTION: The torsion part 20b and the pair of arm parts 2 can be easily attached.
0a, 20a form a U-shaped stabilizer 20, and the torsion portion 20b is connected to the suspension arms 10, 20a.
It is attached to the vehicle body at a position displaced in the front-rear direction from 10, and a low rigidity portion 20d having low rigidity in the left-right direction is formed in each arm portion 20a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stabilizer for an automobile, and more particularly to a stabilizer mounted on a suspension system of an automobile to prevent the body from rolling during running.

[0002]

2. Description of the Related Art Various types of vehicle body suspension devices are used. An independent suspension system in which wheels are connected to a pair of arms extending left and right from the body,
Since the behavior of each wheel does not affect the other wheels, it is known that the suspension device has a comfortable ride. On the other hand, in the independent suspension device, since the roll at the time of turning becomes large, it is common to connect the left and right suspension arms with a stabilizer to suppress the roll.

FIG. 4 is a plan view of a suspension system using a conventional stabilizer, and FIG. 5 is a partial front view of the suspension system. A pair of suspension arms 1, 1 extending left and right
Is rotatably fixed to a vehicle body (not shown) at its inner end by pins 2 and 2 extending in the front-rear direction.
The outer ends of the suspension arms 1, 1 are connected to wheels 3,
3 are connected to knuckles 4 and 4. A spring 5 and a damper 6 are provided between the knuckles 4 and 4 and the vehicle body.
And the vehicle body is floatingly supported by a spring 5. The rear ends of the arms 7a, 7a of the stabilizer 7 are connected to the respective intermediate portions of the suspension arms 1, 1 by bolts, and the front ends of the arms 7a, 7a are integrally connected by the torsion portion 7b of the stabilizer 7. Have been. The stabilizer 7 is formed by bending a round bar into a U-shape to form arms 7a, 7a and a torsion 7b. The vicinity of both ends of the torsion portion 7b is attached to the vehicle body by brackets 9, 9 via bushes 8, 8 covering the outer periphery of the torsion portion 7b.

The suspension arms 1, 1 move up and down around the pins 2, 2 according to the change in the load acting on the spring 5 when the vehicle climbs over an obstacle, turns, or changes the load weight. To rotate. At this time, the stabilizer 7 connected to the suspension arms 1 and 1 also
Although it rotates around the torsion part 7b, since the center of rotation of both is different, the stabilizer 7 will bend right and left simultaneously with rotation. 4 and 5, the shape of the stabilizer 7 indicated by a solid line indicates a state in which the automobile is on the ground, that is, a state in the 1G state. In the same figure, the shape indicated by the dashed line is
The shape of the stabilizer 7 in a state where the vehicle body is lifted and the suspension arms 1, 1 are lowered most, that is, in a full rebound state is shown. Stabilizer 7
As described above, the suspension arm 1, 1 is bent in accordance with the vertical movement, and the dimension between the ends of the arm portions 7a, 7a changes. In most cases, the suspension system of a vehicle is driven or parked under a load of 1 G. To reduce the secular change of the stabilizer 7 after assembly, an extra load is applied to the stabilizer 7 in the 1 G state. Desirably not work. Therefore, the free length between the ends of the arms 7a, 7a before assembly is the arm 7 of each suspension arm 1, 1 in the 1G state.
In general, it is formed to have a dimension substantially equal to the distance W between the mounting portions a and 7a.

[0005] When assembling an automobile or repairing a suspension system, it is common practice to lift a vehicle body using a hanger or a four-post lift on a production line.
In a hanger or a four-post lift, the body is lifted by placing a portion immediately behind a front wheel and a portion immediately before a rear wheel of the vehicle on a hanger or lift arm. Therefore, when assembling or repairing an automobile, the suspension arms 7, 7 are operated in the fully lowered rebound state. In the full rebound state, the dimension W1 between the arm attachment portions of the suspension arms 1 and 1 is smaller than the same dimension W when a load of 1 G is applied. Therefore, when assembling the stabilizer 7, the arm 7
In this case, the arm portions 7a and 7a of the stabilizer 7 are temporarily fixed by bolts and the like, and then the hands are released and the temporarily fixed bolts are tightened.
Therefore, the work of assembling the stabilizer 7 required a large arm strength. Further, since the mounting portions of the suspension arms 1 and 1 are bolted while the stress for the stabilizer 7 to spread is applied, the state where the stress is always applied is maintained even after the assembly. For this reason, it is necessary to adopt a structure having a strength enough to withstand the applied stress at all times.

Further, in the conventional stabilizer 7 in which a round bar is bent in a U-shape as in the prior art, the arm portions 7a, 7a,
The stress concentrates on the connecting portion between the torsion portion 7a and the torsion portion 7b, and the entire arm portions 7a, 7a and the torsion portion 7b are curved to absorb the dimensional displacement. Therefore,
When only one of the suspension arms 1 moves up and down, a load of both bending and torsion is applied to the connecting portion between the arm portions 7a, 7a and the torsion portion 7b, so that a large-diameter stabilizer is applied to the connecting portion. To ensure sufficient strength and increase the weight. In addition, since the torsion portion 7b also curves with the vertical movement of the suspension arms 1, 1, the rotation of the stabilizer 7 was not performed smoothly, and the suspension device could not operate smoothly.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a stabilizer for an automobile which is easy to assemble, has a light weight, and can achieve a smooth turning operation.

[0008]

In order to achieve the above object, according to the present invention, there is provided an automobile having a pair of suspension arms rotatably mounted on a vehicle body, extending in opposite directions to each other, and swinging up and down. , A torsion portion that is attached to the vehicle body so as to be rotatable in the circumferential direction at a position extending to the left and right and displaced to the front or rear of the suspension arm, and a front and rear same direction from a position separated to the left and right of the torsion portion. And a stabilizer which is attached to the suspension arm and at least partially has a pair of arms having a cross section having a lower rigidity in the left-right direction than a rigidity in the vertical direction.

[0009]

1 to 3 show an embodiment of the present invention. FIG. 1 is a plan view of a vehicle suspension equipped with a stabilizer of the present invention, and FIG. 2 is an embodiment of the suspension. FIG. FIG. 3 is a partially enlarged view of FIG.

[0010] A pair of suspension arms 10, 10 which are arranged at left and right distant locations and extend in opposite directions to each other.
Have pin bearings 10a, 10a at the inner end, and pillow balls 10b, 10b at the outer end. The pin bearings 10a, 10a are rotatably attached to brackets 11, 11 projecting from the vehicle body by pins 12, 12, which extend in the front-rear direction. Further, an arm bush 10c made of an elastomer material is interposed between the pin bearing 10a and the bracket 11, so that the suspension arm 10 rotates in the circumferential direction of the pin 12, and can slightly move back and forth and up and down. . Pillow ball 1
Ob and 10b are connected to knuckles 13 and 13, respectively. The knuckle 13 rotatably supports an axle 15 to which wheels 14 are fixed, and a knuckle arm 16 that moves left and right by operating a handle (not shown).
Steered left and right. A spring 17 and a damper 18 are attached to the upper part of the knuckle 13 so as to be able to expand and contract with the vehicle body, and the spring 17 supports the vehicle body while supporting the weight of the vehicle body.

The stabilizer 20 has a substantially round shape formed by bending a single steel round bar into a substantially U-shape, and has a pair of left and right sides that extend rearward from a position separated from the front and left and right of the suspension arms 10 and 10. Arms 20a, 2
0a and a linear torsion portion 20b connecting the front ends of the arm portions 20a, 20a. The front ends of the arms 20a, 20a are bent in the left-right direction to form connecting parts 20c, 20c, and are connected to the torsion part 20b. Further, the connection portions 20c, 20
On the arm portions 20a, 20a slightly behind c, low-rigid portions 20d, 20d formed by cutting off a part of the circular cross section are formed. The low-rigidity portion 20d has a cross section in which the rigidity in the left-right direction is lower than the rigidity in the vertical direction because a portion corresponding to the outer side in the left-right direction is cut off. A through hole 10d in the front-rear direction is provided near the middle part outside of each of the suspension arms 10, 10, and the arm portion 20a of the stabilizer 20 is formed of a bush 2 made of an elastomer material.
It penetrates through 1, 21. And the arm part 20
Although a is fixed to the suspension arm 10 by the nut 22, it can be slightly moved back and forth, left and right, and up and down by the bushes 21 and 21. Torsion part 2
Ob is surrounded by stabilizer holding bushes 23, 23 made of an elastomer material at the outer periphery near both ends thereof, and is attached to the vehicle body by brackets 24, 24 covering the outer circumferences of the stabilizer holding bushes 23, 23.

When the load acting on the spring 17 changes due to the vehicle getting over an obstacle, turning, or changing the loaded weight, the suspension arm 10,
10 rotates up and down around the pins 12 and 12. Since the rear ends of the arm portions 20a, 20a of the stabilizer 20 are attached to the left and right suspension arms 10, 10, the stabilizer 20 moves its torsion portion 20 as the suspension arms 10, 10 move up and down.
It rotates in the circumferential direction about b. Since the positions of the center of rotation of the suspension arms 10, 10 and the center of rotation of the stabilizer 20 are different, the stabilizer 20 bends right and left simultaneously with the rotation. Left and right arms 20a, 20
a is provided with a low-rigidity portion 20 d having a lower rigidity in the left-right direction than a rigidity in the vertical direction.
Most of the left and right deflections are absorbed by the deformation of the low rigidity portion 20d. Since the low rigidity portion 20d has low rigidity in the left-right direction, the suspension arms 10, 10
Even if it is deflected by the above, the repulsive load generated is much smaller than that of the conventional one. In addition, low rigidity part 2
Since the vertical rigidity of 0d is large, when the vehicle rolls, the vertical movement of the suspension arms 10, 10 can be reliably transmitted to the torsion portion 20b, and the function of the stabilizer 20 is not impaired.

In FIGS. 2 and 3, the shapes of the suspension arm 10 and the stabilizer 20 in a so-called 1G state where the vehicle is on the ground are shown by solid lines. Further, the shape of the vehicle body in a fully rebound state in which the vehicle body is lifted is indicated by a chain line. Before mounting the stabilizer 20, the free length between both ends of the arms 20a, 20a is set to a dimension substantially equal to the distance between the through holes 10d, 10d of the suspension arms 10, 10 when a load of 1 G is applied to the spring 17. Is formed. Therefore, when the vehicle on which the stabilizer 20 is assembled is placed on the ground, the arm units 20a and 20a
a and little load acts on the bush 21 interposed between the suspension arms 10 and 10.
It has a structure that does not easily change over time.

When the vehicle body is lifted by a hanger or a four-column lift on the production line, the suspension arm 1
0, 10 rotate to the full rebound position, and the through hole 1
The dimension between 0d and 10d is shorter than the dimension between both ends of the arms 20a and 20a. Even when the stabilizer 20 is mounted in such a state, the stabilizer 20 can be easily bent in the left-right direction by the low-rigidity portion 20d, so that the positioning can be easily performed by applying a slight force. Further, since the low-rigidity portion 20d is formed behind the connection portion 20c, the displacement in the left-right direction can be absorbed by the deformation of the low-rigidity portion 20d, and the rotational load of the stabilizer 20 is concentrated on the connection portion. No extra load acts on 20c. Therefore, even when only one of the suspension arms 10 moves up and down, the connection portion 20c
Is reduced, the outer diameter of the entire stabilizer 20 can be reduced, and the weight and manufacturing cost can be reduced. Further, since the left and right bending of the stabilizer 20 is almost absorbed by the low rigidity portion 20d, the torsion portion 20b may be curved,
An extra load does not act on the stabilizer holding bushes 23, 23, and the stabilizer 20 can rotate smoothly.

In the above embodiment, the torsion portion 20b of the stabilizer 20 is disposed forward of the suspension arms 10, 10, but the torsion portion 20b is disposed rearward of the suspension arms 10, 10, and the arm portion 20a, 20a may be extended forward. Further, the low rigidity portion 20 formed on the arm portions 20a, 20a
The shape of d and 20d is not limited to the half-moon-shaped cross section as shown in the drawing, and may be any shape as long as the lateral rigidity is weaker than that of the other arm portions 20a. Further, when the wheel 14 is steered so that the outer end of the inner surface of the wheel 14 and the low-rigidity portion 20d are close to each other, the wheel 1 is inserted into the notch of the low-rigidity portion 20d.
4, the steering angle of the wheels 14 can be increased.

[0016]

According to the present invention, the arm portions 20a of the stabilizer 20 are provided with the low rigidity portions 20d, 20d, so that the arm portions 20a can be easily displaced in the lateral direction. Therefore, even when the vehicle body is lifted for assembling or repairing the stabilizer 20, even if the through-holes 10d, 10d,
It is easy to deform the stabilizer 20 to the size of 10d. Also, the suspension arm 10,
Since the change in the horizontal dimension of the stabilizer 20 due to the vertical movement of the head 10 is absorbed by the low-rigidity portions 20d, the bending stress does not act on the connecting portions 20c, but only the torsional stress acts. Therefore, stabilizer 2
0 can be made thinner, and the weight and manufacturing cost can be reduced. Further, since no bending stress acts on the torsion portion 20b, no extra load acts on the stabilizer holding bushes 23, 23, and the secular change of the holding bushes 23, 23 is reduced. Further, since the torsion portion 20b is not bent even by the vertical movement of the suspension arms 10, 10, the rotation of the stabilizer 20 is performed smoothly.

[Brief description of the drawings]

FIG. 1 is a plan view of a vehicle suspension system provided with a stabilizer of the present invention.

FIG. 2 is a partial front view of the suspension device shown in FIG.

FIG. 3 is an enlarged partial cross-sectional view of FIG. 1;

FIG. 4 is a plan view of a suspension device using a conventional stabilizer.

FIG. 5 is a partial front view of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Suspension arm 20 Stabilizer 20a Arm part 20b Torsion part 20d Low rigidity part

Claims (1)

[Claims] 1. An automobile having a pair of suspension arms rotatably mounted on a vehicle body and extending in opposite directions to each other and swinging up and down. A torsion portion which is attached to the vehicle body so as to be rotatable in its circumferential direction at a displaced position; and a torsion portion which is attached to the suspension arm and extends in the front-rear direction from a position separated to the right and left of the torsion portion, and is attached to the suspension arm at least partially in the vertical A stabilizer comprising a pair of arms having a cross section having a lower rigidity in the left-right direction than the rigidity of the vehicle.