JPS587485B2 - Split torsion bar for suspension system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to an improvement of a torsion bar suspension system used in a front suspension, in which the anchor arm position and the suspension arm position can be relatively freely selected, and the torsion bar suspension system is improved. It is an object of the present invention to provide a torsion bar complete suspension device that is easy to attach and detach and has a large degree of freedom in design.

A conventional torsion bar suspension system consists of a rotating shaft 2 of a suspension arm 1 and a torsion bar 3, as shown in FIG.
The rotating shaft 2 is fitted into the bearing part 4 of the lower arm or upper arm of the suspension arm 1 via a rubber pusher 5, and the end of the torsion bar 3 is also serrated into the bearing part 4. 6 are fitted together, and when the bearing part 4 of the suspension arm 1 rotates around the rotating shaft 2 in response to the vertical movement of the wheel, the rotational movement directly acts as a torsional moment on the torsion bar 3. It is like that.

Therefore, the anchor arm 7 of the torsion bar 3 must be placed on the same axis as the rotation axis 2 of the suspension arm 1, and since the suspension arm 1 also serves as the torsion arm of the torsion bar 3, the anchor arm 7 of the torsion bar 3 must be placed on the same axis as the rotation axis 2 of the suspension arm 1. The direction and magnitude of the torque cannot be freely selected, and therefore, not only the length, diameter, etc. of the torsion bar 3 are limited by the accommodation space and stress, but also the suspension arm 1 is limited by the bearing part 4, steering knuckle, etc. There are design restrictions on the size, arrangement, etc. of the support section 8 depending on its position and direction, and there is not enough space to easily attach and detach the engine, but there are problems with the workability of the anchor. Disadvantages include the fact that there are restrictions on the mounting position and direction of the arm 7, which causes problems with its ground clearance, and that the torsion bar 3 is a single unit and has a long length, making it difficult to install and remove it. There were many design constraints from both the car body and engine sides.

The present invention provides a torsion bar suspension system that overcomes the above-mentioned drawbacks by having the configuration described in the claims.

Figure 1 shows an example of implementation.
It is characterized in that it is divided into two torsion bar members 10 and 11 via a universal joint 13.

That is, in the drawing, the support part 8 is located at the steering knuckle (
Suspension arm 1 jointed to (not shown)
is pivotally supported by a rotating shaft 2 attached to the body by a stator 9.

The suspension arm 1 has a shaft on the same axis as the rotating shaft 2.
One end of the torsion bar member 10 is connected by serration fitting or the like.

The other end of this torsion bar member 10 is similarly connected to the yoke 17 of the universal joint 13 by serration fitting or the like.

The torsion bar member 10 and yoke 17 are coaxial with the rotating shaft.

In FIG. 1, the universal joint 13 has a yoke 17 fitted into a bearing portion 14 fixed to a body B via a pusher 15, and is maintained in the same axial position as the rotating shaft.

One end of another torsion bar member 11 is connected to the other yoke 18 of the universal joint 13 by serration fitting or the like, and the other end is connected to the anchor arm 7 by serration fitting or the like.

Anchor arm 7 is fixed to the body.

The universal joint 13 may have a configuration in which a choke 18 instead of the yoke 17 is supported by a bearing portion fixed to the body.

Furthermore, the torsion bar 12 can be divided into two or more members via respective swivel joints. Ru.

The present invention has the above-described configuration, and when the wheel (not shown) moves up and down, the suspension arm 1 moves up and down with the rotation axis 2 as the center of rotation, and the suspension arm 1 has the same axis as the rotation axis 2. Torsional torque acts on one end of the torsion bar member 10 connected to the core, and the torsion bar members 10 and 1 are integrally connected via the universal joint 13.
1 together produce a spring damping effect.

By dividing the torsion bar 12 into torsion bar members 10, 11, etc., for example, the torsion spring constants of the members 10, 11 can be selected appropriately, and one can be used for high frequency vibration and the other for high frequency vibration. It is also possible to adopt a configuration that can cope with low frequency vibrations, and it is also possible to avoid resonance vibrations.

Additionally, it is necessary to vary the length, diameter, etc. of the torsion bar depending on the car model equipped with the torsion bar, but by making this a split configuration, one part of the torsion bar is common to each car model, and the other By making the torsion bar members different depending on the vehicle model, it is possible to reduce costs by making the parts common.

Since the device of the present invention has the structure and operation as described above,
The torsion bar 12 is the arrangement of the suspension arm 1,
Regardless of the operation and function, the anchor arm 7 can be installed in any position, and the position of the anchor arm 7 can be selected relatively freely. By increasing the rigidity of each torsion bar member 10 and 11, a synthetic spring can be used to suit the purpose. Since a constant value can be obtained and the length per member is short, the workability of attaching and detaching the torsion bar 12 is good, and the vertical and horizontal positions of the suspension arm 1, the receding angle of the rotating shaft 2, Since the advance angle can be selected relatively freely, the degree of freedom in design is greatly increased.

Therefore, by increasing the interval between the torsion bars 12, there is the effect of widening the space for attaching and detaching the engine.If a rubber push is used for the push 15 of the bearing part 14, vibration and noise can be isolated. Universal joint 1
It is also possible to obtain the effect of damping torsional vibration by adjusting the friction between the two parts.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an example of the embodiment, and FIG. 2 is a schematic plan view of a conventional device showing the two parts as a cross section. 1... Suspension arm, 2...
Rotating shaft, 7... Anchor arm, 10, 11.
... Torsion bar member, 12 ... Torsion bar, 13 ... Universal joint, 17, 18
...Yoke, B...Body.

Claims (1)

[Claims] 1. A torsion bar member fixed to a suspension arm that is pivotally supported by a rotating shaft on the body side is attached to a torsion bar member fixed to an anchor arm so that the suspension arm is coaxially aligned with the rotational shaft. A split torsion bar for a suspension system, characterized in that the split torsion bar is connected via a universal joint.