JPH0452084Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a parallel link used in a vehicle suspension.

(Prior art) The suspension includes mutually parallel parallel links that are arranged in pairs to extend in the vehicle width direction, and the inner ends of these parallel links in the vehicle width direction can swing vertically relative to the vehicle body. For example, a parallel link suspension in which the outer end in the vehicle width direction is pivotally connected to a wheel support member to support suspension input in the vehicle width direction is described in the article published by Nissan Motor Co., Ltd. in October 1981. “Nitsun Service Weekly Report” No. 491
No. (BL-14), page 31, and is well known.

A parallel link used in this type of suspension is shown in the above-mentioned document, and as shown in FIG. 8, elastic bushings b for pivoting the vehicle body and elastic bushings for pivoting the wheel support members are attached to both ends of a solid or hollow round bar a, respectively. It is common practice to provide a channel member d having a U-shaped cross section by press molding or the like instead of the round bar as shown in FIGS. 9a and 9b.

(Problem to be solved by the invention) However, in all conventional parallel links, since the upper surface e is located above the vehicle than the plane k including the pivot axes f and g at both ends, the strength with the wheel support member is limited. In order to change the buckling strength of the parallel link in order to maintain balance, there is no choice but to change the diameter of the round bar a or the thickness of the channel member d, which requires a large-scale work to balance the strength described above. It was becoming.

In addition, there are often exhaust pipes and filler tubes above the parallel link, and with conventional parallel links that have a high level of upper surface e, it is difficult to secure clearance with the exhaust pipe and filler tube, making it difficult to maintain sufficient suspension stroke. There was also the problem of not being able to provide support.

(Means for Solving the Problems) In order to solve these problems, the present invention provides the above-mentioned parallel link type suspension by forming the parallel links in a U-shape in cross section and arranging the parallel links so that their openings face downward. The upper wall level is set below the plane containing the pivot axis at both ends of the parallel link, and a portion of the upper wall of the parallel link is removed in order to change the buckling strength of the parallel link in order to balance the strength with the wheel support member. This can be achieved only by

(Function) The parallel link supports suspension input in the vehicle width direction due to its longitudinal rigidity. The parallel link swings in the vertical direction around the vehicle body side pivot axis at the inner end in the vehicle width direction, thereby enabling the wheels to spring.

By the way, the parallel link has a U-shaped cross section and is arranged with its opening facing downward, and the upper wall level is set below the plane that includes the pivot axes at both ends of the parallel link, so the strength balance with the wheel support member is In order to change the buckling strength of the parallel link, this can be done by simply drilling a hole in the upper wall or removing a portion of it, making the work of balancing the strength described above simple and easy. be.

In addition, the low upper wall level of the parallel link increases the clearance between it and the exhaust pipe or filler tube that exists above it, allowing more leeway in the suspension stroke.

(Example) Hereinafter, the present invention will be explained in detail based on the illustrated example.

Figures 1 to 4 are single-piece views of a parallel link according to an embodiment of the present invention.
It is shown in FIG.

First, to explain the parallel link type suspension, 1 in Figures 6 and 7 is the wheel (left rear wheel);
2 is a wheel support member that rotatably supports this; 3
5 is a parallel link of the present invention used in a pair to support the member 2 on the vehicle body 4 so that it can swing in the vertical direction of the vehicle body, 5 is a strut that cushions the member 2 in the vertical direction of the vehicle body, and 6 is a parallel link that supports the member 2 in the longitudinal direction of the vehicle body. The supporting radius slots are shown.

As clearly shown in FIGS. 1 to 4, the parallel link 3 is press-formed to have a U-shaped cross section, and the opening surface 7 thereof faces downward, that is, the upper wall 3a far from this opening surface is shaped as shown in FIG. 6. Place it so that it is facing upward. A pair of parallel links 3 extend in the vehicle width direction and are arranged parallel to each other as shown in FIG. The outer end in the vehicle width direction is pivotally connected to the wheel support member 2 via an elastic bush 9 and a pin 10 inserted through these so as to be pivotable in the vertical direction of the vehicle body. The radius slot 6 extends in the longitudinal direction of the vehicle, and its front end is connected to the bush 1.
1 to the vehicle body, and the rear end of the wheel is supported to the support member 2 via a bush 12.

As shown in FIGS. 1 and 2, outer collars 8 are provided at both ends of each parallel link 3 having a U-shaped cross section.
a and 9a, inner collars 8b and 9b are provided concentrically thereto, and annular rubber bodies 8c and 9c are bonded between the respective outer and inner collars, thereby constructing the bushes 8 and 9. and,
The upper wall 3a of the parallel link 3 extends over almost its entire length except for both ends, and extends along the center axis of the elastic bushing 8, that is, the vehicle body side pivot axis X of the parallel link, and the center axis of the elastic bush 9, that is, the wheel side pivot axis of the parallel link. It is biased downward (downward in FIG. 1) to a level below (in the illustrated example, the same level) a plane Z including the axis Y. Therefore, by making both ends of the upper wall 3a higher than the surface Z, and making smooth continuity between these ends and the above-mentioned offset central part of the upper wall,
To make it possible for mud and snow riding on the parallel link 3 to easily slide down while the parallel link 3 is swinging.

The opening edge 3b of the parallel link 3 is curved outward in a U-shape as shown in Fig. 3 to improve the bending strength of the parallel link, thereby preventing the parallel link 3 from bending deformation in the event of a collision. to prevent damage to the fuel tank. Therefore, the curved opening edge 3b is shaped to gradually disappear at both ends as shown in Figure 4, so that the mud accumulated on the curved opening edge is removed from both ends to prevent the formation of mud pools. .

The operation of the above embodiment will be explained next.

The parallel link 3 enables the wheel 1 to bounce and rebound by swinging around the wheel-side pivot axis X via the elastic bush 8, and during this time the strut 5
The shock-absorbing function of the wheel 1 alleviates the shock to the vehicle body, and attenuates the elastic vibration of the wheel 1. The wheel support member 2 is supported in the vehicle width direction by the longitudinal rigidity of the parallel link 3, and supported in the longitudinal direction of the vehicle body by the longitudinal rigidity of the radius slot 6.

The parallel link 3 configured such that the upper wall 3a is at a level below the plane Z is connected to the wheel support member 2.
If it is desired to reduce the buckling strength in order to maintain a balance between the There is no need for large-scale measures such as changing the plate thickness of the parallel link, and the work of achieving the strength balance described above can be made simple and easy.

Note that if it is necessary to significantly reduce the buckling strength of the parallel link 3, a notch 14 may be provided in the parallel link 3 to remove a portion of the upper wall 3a in the longitudinal direction, as shown in FIG. is also possible.

Furthermore, by setting the upper wall 3a of the parallel link 3 to a level below the plane Z, the clearance between this upper wall and the exhaust pipe and filler tube existing above it becomes large, creating a margin in the suspension stroke. It happens.

(Effect of the invention) Thus, the parallel link of the invention has the following effects as described above.
It has a U-shaped cross section and is arranged so that its opening surface 7 faces downward, and the level of the upper wall 3a is set below the plane Z that includes the pivot axes X and Y at both ends of the parallel link, so that the strength balance with the wheel support member 2 is maintained. Changing the buckling strength of the parallel link, which is essential for the installation, is done by drilling a hole in the upper wall 3a (indicated by 13) or partially removing it (indicated by 14).
The work of achieving the strength balance described above is simple and easy.

In addition, the low upper wall level of the parallel link increases the clearance between it and the exhaust pipe and filler tube that exist above it, allowing more leeway in the suspension stroke.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the parallel link of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 and 4 are sectional views of FIG. 1 and FIG. 4, respectively.
5 is a side view similar to FIG. 1 showing another example of the present invention; FIG. 6 is a plan view of a suspension for the left rear wheel using the parallel links shown in FIGS. 1 to 4; 9A is a side view of the same, FIGS. 8 and 9A are side views showing conventional parallel links, and FIG. 9B is a cross-sectional view of FIG. 9A. DESCRIPTION OF SYMBOLS 1...Wheel, 2...Wheel support member, 3...Parallel link, 3a...Top wall, 3b...Opening edge, 4
... Vehicle body, 5 ... Strut, 6 ... Radius slot, 7 ... Opening surface, 8 ... Elastic bushing for mounting on the vehicle body, 9 ... Elastic bushing for mounting wheel support member,
10... Pin, 13... Buckling strength adjustment hole, 14...
...bending strength adjustment notch, X...body side pivot axis,
Y...Wheel side pivot axis, Z...plane including the pivot axis.

Claims (1)

[Claims for Utility Model Registration] Parallel links arranged as a pair to extend in the vehicle width direction are provided, and the inner ends of these parallel links in the vehicle width direction are pivoted to the vehicle body so as to be swingable in the vertical direction. In a parallel link type suspension in which the outer end in the vehicle body direction is pivotally connected to a wheel support member, the parallel link is formed into a U-shape in cross section and is arranged so that its opening face faces downward, and the upper wall level of the parallel link is provided. A parallel link for a suspension, characterized in that: is below a plane containing pivot axes at both ends of the parallel link, and the buckling strength of the parallel link can be changed by only removing a portion of the upper wall.