JPH0212765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in vehicle suspension systems, particularly of the McPherson type.

The MacPherson type suspension system, which is part of the shock absorber's suspension link, uses a radius arm pivotally mounted on the vehicle body to support the knuckles that support the wheels.
A shock absorber is interposed between the nut and the vehicle body. The radius arm is connected to the lower arm, the lower arm is also connected to the vehicle body, and the radius arm,
A rubber bushing is interposed at the connection portion of the lower arm on the vehicle body side.

It is known to use a torsion bar that acts on the rotating part of the lower arm as a spring means for such a suspension system. However, the conventionally used lower arm is rigid in the longitudinal and vertical directions, and the following movement of the lower arm bends the torsion bar joint. This has the disadvantage that it acts as a moment and fatigues the joint.

The present inventor has devised the present invention in order to improve the above-mentioned disadvantages when a suspension system is configured as described above. They are connected by an elastic body such as a bending leaf spring, and the lower arm is connected to the end of the torsion bar so as to transmit the load in the torsion direction of the bar, thereby effectively demonstrating the functional effect of the torsion bar while smoothly following the movement in the longitudinal direction. It is an object of the present invention to provide a suspension system for a vehicle that can perform the above operations with a simple structure.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partially cutaway plan view showing the basic structure, and the upper side of the page of the drawing is the front of the vehicle.

Reference numeral 1 designates a cross member at the front of the vehicle body, at the end of which a torsion bar support cylinder 2 made of a rigid body is inserted and supported in the longitudinal direction, and the front part of the support cylinder 2 is connected to the cross member 1.
fixed at the end. A torsion bar spring 3 is loosely inserted into the support tube 2 in the same direction as the torsion bar spring 3, and the rear end 3a of the torsion bar 3 is fixed to the rear end 2a of the support tube 2. The torsion bar 3 is sufficiently longer than the support tube 2, and its middle or front portion extends forward by a sufficient length from the front end of the support tube 2.

Reference numeral 4 denotes a rigid radius arm having an approximately inverted L shape in plan view, which supports the wheel 5 via a knuckle.A small-diameter support portion 4a is formed at the rear end portion of the radius arm 4 extending in the longitudinal direction of the vehicle body, and this support portion is formed into a ring-shaped portion. The front and rear rubber bushes 6, 6 are fitted and supported, and the rubber bushes 6, 6 are supported by a pair of support brackets 7, 7 having symmetrical concave plate parts 7a, 7a, and the flange part 4b at the base of the support part 4a and the end part The brackets 7, 7 are clamped in the axial direction, that is, in the front-back direction, by the support pieces 8, and the bases of the brackets 7, 7 are tied to the support cylinder 2. Therefore, the rear end of the radius arm 4 is supported on the vehicle body side by rubber bushes 6, 6, and the longitudinal swing and vertical rotation of the radius arm 4 are absorbed by the rubber bushes 6, 6, and the wheels 5 absorb the longitudinal swing. movement and vertical rotation are allowed.

A support stay 9 is fixed and extended diagonally forward in front of the cross member 1, and a circular hole 9a is provided at the tip of the support stay 9, penetrating in the forward motion direction, and the outer diameter of the rubber bush 10 is inserted into the inner diameter of this hole 9a. They are joined by baking or the like, and the outer diameter part of the collar 11 is joined to the inner diameter part of the rubber bushing by baking or the like. The support sleeve 12 is press-fitted into the inner diameter of the collar 11, and the support sleeve 1
The tip of the torsion bar 3 described above is passed through the inner diameter of the sleeve 12, and the tip 3b is connected to the inner diameter of the intermediate portion to the tip of the sleeve 12 by serrations or the like. A base 13a on the inner side in the vehicle width direction of an elastic body such as a leaf spring 13, which forms a lower arm that is elastically bent in the front-rear direction and rigid in the vertical direction, is integrally connected to the tip of the support sleeve 12, and Bolts 14, 1 are attached to the front edge of the tip 4c, which is formed by bending the tip 13b of the spring 13 on the outside in the vehicle width direction to the outside of the radius arm 4, which has a substantially inverted L shape in plan view.
Conclude with 4. Radius arm 4 supports wheel 5 with a knuckle (not shown) and restricts unnecessary movement of wheel 5 in directions other than permissible directions and input to lower arm 13.

In the above, the road surface reaction force of the wheels 5 acts on the radius arm 4, the shock in the vertical direction is buffered by a shock absorber (not shown), and the vertical movement of the radius arm 4 acts as a rotational movement with the support part 4a as a fulcrum.
This is absorbed by the rubber bushes 6, 6, and since the lower arm 13 is connected to the radius arm 4, the vertical rotation of the radius arm 4 is directly transmitted to the leaf spring 13 that constitutes the lower arm.
Since the leaf spring 13 is rigid in this direction, it is transmitted to the support sleeve 12, causing it to rotate, and the sleeve 1
2 and the torsion bar 3 are rigidly coupled in this direction, so the torsion bar 3 is twisted. The torsion reaction force of the torsion bar 3 is transmitted to the leaf spring 13 and the radius arm 4 forming the lower arm, and the shock absorber is returned to its original position by spring action.

Incidentally, the longitudinal movement of the wheel 5 due to a bump on a concave road, etc. is transmitted to the radius arm 4, and in this direction, the leaf spring 13 forming the lower arm is connected to the radius arm 4, so it bends elastically, and as a result, the radius arm The lower arm can easily follow in the front-rear direction, improving followability, and the load caused by the following movement has little effect on the torsion bar as a bending force.

Figure 2 is a plan view of a specific example implemented on a FF vehicle.
The same members as above are given the same reference numerals, and new members are given new numbers.

The wheel 5 supports a planar U-shaped knuckle 15, and the rear end of the knuckle 15 is connected to a tie rod 16.
The tie rod 16 is driven to the right or left via the steering gear box 17, and the knuckle 15 swings left and right around an axis (not shown).The front end of the knuckle 15 that performs steering is provided with a shock absorber support portion 15a.
A shock absorber is interposed between the support portion 15a and the vehicle body. Therefore, the buffer is disposed at a position offset forward from the center of the knuckle 15. Reference numeral 18 denotes a drive shaft. The drive shaft 18 is connected to the wheel 15, and is disposed approximately parallel to the leaf spring 13 forming the lower arm described above. Since the shock absorber is offset forward, the drive shaft 18 and the shock absorber are connected to each other. The layout, design, and structure are freed from the layout, design, and structural constraints of proximity.

As is clear from the above, according to the present invention, the lower arm can smoothly follow the radius arm in the longitudinal direction, and the lower arm can be supported by the torsion bar while protecting it without applying a bending load to the torsion bar. It has the advantage of ensuring vertical rigidity of the lower arm and smoothing the spring action of the torsion bar, making it extremely effective in practical use as a suspension system for FF vehicles.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a partially cutaway plan view showing the basic structure, and Fig. 2 is a FF
FIG. 2 is a plan view of an example implemented in a car. In the drawing, 4 is a radius arm, 3 is a torsion bar, 5 is a wheel, and 13 is a lower arm.

Claims (1)

[Scope of Claims] 1. An inverted L-shaped radius arm bent outward from the longitudinal direction of the vehicle body, which is supported by the vehicle body so as to be movable vertically via a rubber bush that absorbs the longitudinal motion of the wheels, connects the wheels via a knuckle. One end of a torsion bar spring extending in the longitudinal direction of the vehicle on the inside of the vehicle width of the radius arm is fixed to the vehicle body, and the vicinity of the other end is supported by the vehicle body, and the torsion bar spring is supported by the vehicle body. A vehicle characterized in that the other end of the bar spring and the radius arm are connected by a lower arm made of a plate-shaped elastic body that extends substantially in the vehicle width direction when viewed from above, is flexible in the longitudinal direction of the vehicle, and is rigid in the vertical direction. Suspension system.