JPH09193635A - Bump stopper fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit a bump stopper easily and appropriately to a suspension arm with a small number of part items while suppressing the enlargement, weight increase, and the like of the suspension arm to a minimum. SOLUTION: In bump stopper fitting structure with a bump stopper 5 fitted to the upper face part of a hollow suspension arm 1 with an upper member 1A and a lower member 1B jointed, a distance piece 7 held between the upper member 1A and lower member 1B of the suspension arm 1 is disposed below the bump stopper 5, and a fitting shaft 6 for supporting the bump stopper 5 pierces the upper member 1A and lower member 1B so that its lower end part protrudes downward of the lower member 1B, and is fixed to the lower face side of the lower member 1B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for properly attaching a bump stopper for absorbing and absorbing a shock when a suspension arm of a vehicle comes into contact with a vehicle body to a suspension arm formed in a hollow shape.

[0002]

2. Description of the Related Art As is well known, as a suspension arm for a vehicle, there is a suspension arm formed by joining an upper member and a lower member so that the entire arm is hollow. Further, as a means for attaching a bump stopper to such a suspension arm, for example, see Japanese Utility Model Laid-Open No. 58-118.
As shown in FIG. 3 of Japanese Patent Laid-Open No. 103, the bump stopper is generally bolted to the suspension arm.

That is, conventionally, as shown in FIG. 4 of the present application, the bump stopper 5e is arranged on the upper surface of the hollow suspension arm 1e, but the mounting bolt protruding on the lower surface of the bump stopper 5e. 6e, the upper member 1 of the suspension arm 1e
It penetrates through 9a. Then, inside the suspension arm 1e, a nut 6f is screwed onto the mounting bolt 6e and then tightened. Further, the coil spring 4 is positioned by forming an annular groove portion 18 or the like on the upper member 19a.

[0004]

However, in the above-mentioned conventional means, since the bump stopper 5e is only attached to the thin plate-shaped upper member 19a of the suspension arm 1e, the strength of the attachment portion of the bump stopper 5e is increased. It was difficult to secure enough. That is,
When there is a very large input in the direction of raising the suspension arm 1e (direction of arrow b) when the vehicle is running,
The bump stopper 5e may come into strong contact with the vehicle body frame 3, but the impact force at this time is concentrated on the thin plate-shaped upper member 19a of the suspension arm 1e. Therefore, even if the upper member 19a is provided with the annular groove portion 18 or the like to slightly increase the rigidity of the portion, the upper member 19a alone is enough.
Is insufficient and the upper member 19a is likely to be deformed. Therefore, conventionally, as a means for solving such a problem, it is necessary to make the upper member 19a thick, or to additionally provide a thick reinforcement, thereby reducing the weight of the suspension and reducing the manufacturing cost. There was a big disadvantage in terms of reduction.

Further, in the above conventional means, the mounting bolt 6e of the bump stopper 5e and the nut 6f are tightened inside the suspension arm 1e. For this reason, the tightening work is not easy, and there is a problem in terms of manufacturing workability. Further, it is necessary to provide the lower member 19b of the suspension arm 1e with the insertion hole 90 having a large opening area into which the tightening tool K can be inserted, and the disadvantages in terms of the strength of the suspension arm 1e are more remarkable.

Incidentally, in the prior art, for example, as shown in FIG. 5, by forming a concave portion 92 in the upper member 19c of the suspension arm 1f, the upper member 19c is formed.
There is also a means for joining the concave portion 92 of the above to the lower member 19d to enhance the rigidity of the mounting portion of the bump stopper 5e. However, with such means, the processing of the concave portion 92 is complicated, and it is necessary to provide a special pedestal 91 for correcting the height of the bump stopper 5e to the original position, which makes the manufacturing cost considerably high. Become. In addition, water easily accumulates in the concave portion 92 of the upper member 19c, and this water may freeze in winter, which is not preferable for each part such as the coil spring 4. Therefore, such means cannot appropriately eliminate the above-mentioned drawbacks.

The present invention has been devised under such circumstances, and the bump stopper is provided with respect to the suspension arm while suppressing an increase in weight of the suspension arm and an increase in manufacturing cost. It is an object of the present invention to make it possible to easily and properly mount the device with sufficient strength.

[0008]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

That is, the present invention is a bump stopper mounting structure in which a bump stopper is mounted on the upper surface of a hollow suspension arm that joins an upper member and a lower member. Is provided with a distance piece sandwiched between an upper member and a lower member of the suspension arm, and a lower end portion of a mounting shaft for a bump stopper that supports the bump stopper has a lower end of the lower member. Penetrates the upper member and the lower member so as to project downward,
The lower member is characterized in that it is fixed on the lower surface side.

According to the present invention, since the distance piece sandwiched between the upper member and the lower member of the suspension arm is arranged below the bump stopper, the mounting position of the bump stopper is via the distance piece. The structure is also supported by the lower member, and the impact force when the bump stopper comes into contact with the vehicle body above it can be appropriately received not only by the upper member but also by the lower member. Therefore, unlike the conventional structure in which the bump stopper is supported only by the upper member, it is possible to mount the bump stopper at an attachment position without unnecessarily thickening the upper member or providing another thick reinforcement. The strength of the suspension arm can be increased, and a special effect of reducing the weight of the suspension arm and reducing the manufacturing cost can be obtained.

Further, in the present invention, the lower end of the mounting shaft for the bump stopper projects below the lower member of the suspension arm, and the lower shaft side of the lower member is fixed to the mounting shaft. Unlike, you don't have to do anything like insert a tool inside the suspension arm. Therefore, the mounting work of the bump stopper can be facilitated.

Further, although the present invention requires a distance piece, the distance piece is essentially
Any member can be used as long as it exerts a tensioning function between the upper member and the lower member of the suspension arm.
For example, an inexpensive member such as a member having a simple U-shaped cross section or a cylindrical member can be used. Further, in the present invention, the mounting shaft for the bump stopper is passed through the upper member and the lower member of the suspension arm. Since the direction of this mounting shaft coincides with the mounting direction of the distance piece, the distance piece is tightened. It is also possible to eliminate the need for a dedicated bolt for. Therefore, the increase in the number of parts can be suppressed as much as possible, and the manufacturing cost can be further reduced. Of course, since it is not necessary to form the upper member of the suspension in a concave shape, it is possible to appropriately avoid the problem that water is accumulated in the concave portion.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a sectional view of an essential part showing an example of a mounting structure of a bump stopper according to the present invention, and specifically corresponds to a sectional view taken along line XX of FIG. FIG. 2 is a perspective view showing an example of a distance piece used in the mounting structure of the bump stopper shown in FIG. FIG. 3 is a plan view showing an example of a vehicle suspension.

First, the structure of the suspension shown in FIG. 3 will be described. This suspension is a trailing arm type suspension, and a pair of left and right suspension arms 1, 1 extending in the vehicle front-rear direction are connected to each other via a torsion beam 2 extending in the vehicle width direction. Further, in this suspension, in addition to the torsion beam 2, a pair of suspension arms 1, 1
By additionally connecting a stabilizer (not shown) between them, the roll rigidity of this suspension can be further enhanced.

A bush 10 for attaching the suspension arm 1 to a vehicle body frame (not shown) is provided at a front end portion of each of the suspension arms 1 in the vehicle direction. The suspension arm 1 as a whole can swing up and down with C as a fulcrum. A spindle shaft 11 for mounting wheels is also provided on the rear side surface of the suspension arm 1.

As shown in FIG. 1, each suspension arm 1 is formed by joining an upper member 1A and a lower member 1B, which are formed into a desired shape by press molding or the like, and has a middle shape. It is formed in a hollow shape. The upper member 1A is provided with a projecting step portion 12 having a substantially circular shape in plan view. The protruding step portion 12 is fitted into a lower portion of a coil spring 4 interposed between the suspension arm 1 and the vehicle body frame 3 and plays a role of positioning the coil spring 4. The protruding step 12 also serves as a mounting seat for the bump stopper 5, as will be described later. Below the projecting step portion 12, there is provided a step portion 13 in which a part of the lower member 1B projects upward. The lower surface portion of the lower member 1B is provided with a substantially circular recess having an appropriate depth. 14 is formed.

Next, the mounting structure of the bump stopper shown in FIG. 1 will be described. The bump stopper 5 is made of, for example, an elastic member such as synthetic rubber having a cushioning property, and is arranged on the protruding step portion 12 of the upper member 1A of the suspension arm 1. The bump stopper 5 is integrated with the mounting shaft 6 by partially embedding the mounting shaft 6 therein.

The mounting shaft 6 is in the form of a screw shaft having a male screw formed on its outer periphery, and is formed to have a length longer than that of a mounting shaft (bolt) conventionally mounted on an existing bump stopper. The mounting shaft 6 is inserted through a series of upper and lower hole portions 14 and 14a which are formed at substantially central portions of the protruding step portion 12 of the upper member 1A and the step portion 13 of the lower member 1B. There is. The lower end of the mounting shaft 6 projects downward from the lower surface of the lower member 1B, and the nut 6a can be screwed into this projecting portion to be tightened. Therefore, when mounting the bump stopper 5, it is not necessary to insert a tightening tool for the nut 6a into the hollow suspension arm 1, but by tightening the nut 6a outside the suspension arm 1, It can be installed easily.

A distance piece 7 is provided between the projecting step 12 of the upper member 1A and the step 13 of the lower member 1B. As shown in FIG. 2, for example, the distance piece 7 is formed of a metal member having a substantially U-shaped cross section, and serves to stretch both members between the protruding step portion 12 and the step portion 13. Fulfill. The distance piece 7 is attached to the upper member 1A in advance by means such as welding W before joining the upper member 1A and the lower member 1B of the suspension arm 1 to each other. It is possible to appropriately provide between both the lower member and the lower member 1B.

In the mounting structure of the bump stopper having the above construction, when the rear part of the suspension arm 1 is largely lifted in the direction of arrow a and the upper end of the bump stopper 5 is brought into contact with the vehicle body frame 3, the impact force at that time is bumped. Input is made to the upper member 1A of the suspension arm 1 via the stopper 5. However, since the lower surface of the upper member 1A is backed up by the distance piece 7 that is in contact with the lower member 1B, the impact force is not applied to the lower member 1A.
B can also accept it. Further, in the portion where the distance piece 7 is interposed, the protruding step portion 12 is formed in the upper member 1A and the step portion 13 is formed in the lower member 1B, so that the rigidity of each of these portions is also increased. Has been elevated. Therefore, the strength of the mounting portion of the bump stopper 5 is improved, and it is possible to prevent the suspension arm 1 from being easily deformed when the bump stopper 5 contacts the vehicle body frame 3. .

Further, although the distance piece 7 is used in the mounting structure of the bump stopper, the mounting shaft 6 of the bump stopper 5 is provided inside the distance piece 7.
Are arranged along the same direction as the mounting direction of the distance piece 7, and the mounting shaft 6 also functions as a mounting bolt for the distance piece 7. Therefore, it is not necessary to dare to use the fixing bolt dedicated to the distance piece. Therefore, the increase in the number of parts can be suppressed to the minimum number. Of course, since the distance piece 7 is arranged inside the suspension arm 1, it does not cause unnecessary increase in size of the suspension arm 1. Further, since the entire length of the distance piece 7 may be of the same small dimension as the vertical width of the hollow portion in the suspension arm 1, it can be manufactured in a light weight, which is also advantageous in reducing the weight of the suspension arm 1. .

In the above embodiment, since the lower member 1B has the stepped portion 13, the strength of the lower member 1B can be improved, and the mounting shaft 6 of the bump stopper 5 and the distance piece 7 can be improved. It also helps reduce the overall length. Furthermore, the concave portion 1 formed by the step portion 13
By arranging the nut 6a in the shaft 4, it is possible to prevent the nut 6a from unintentionally largely protruding on the lower surface side of the suspension arm 1.
However, the present invention is not limited to such a configuration, and may have a configuration in which the step portion 13 is not formed in the lower member 1B.
Similarly, in the present invention, the protruding step portion 12 is provided on the upper member 1A.
It does not matter even if the structure is not formed.

Further, in the above embodiment, the bump stopper 5 is fixed by tightening the nut 6a screwed to the mounting shaft 6, but the present invention is not limited to this. As the fixing means of the mounting shaft 6, other means different from the nut tightening means may be adopted.

Further, although the distance piece 7 having a substantially U-shaped cross section is used in the above embodiment, the specific shape of the distance piece 7 is not particularly limited. For example, the shape of the distance piece may be cylindrical or other tubular shape.

In addition, the specific construction of each part of the mounting structure of the bump stopper according to the present invention can be modified in various ways. Of course, the present invention can be applied to various types of suspensions as long as it is a suspension using a suspension arm formed in a hollow shape by joining an upper member and a lower member. It doesn't matter what kind of suspension you use.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an essential part showing an example of a bump stopper mounting structure according to the present invention, and specifically corresponds to the cross-sectional view taken along line XX of FIG.

FIG. 2 is a perspective view showing an example of a distance piece used in the bump stopper mounting structure shown in FIG.

FIG. 3 is a plan view showing an example of a vehicle suspension.

FIG. 4 is a sectional view of an essential part showing an example of a conventional bump stopper mounting structure.

FIG. 5 is a cross-sectional view of essential parts showing another example of a conventional bump stopper mounting structure.

[Explanation of symbols]

 1 Suspension Arm 1A Upper Member (Suspension Arm) 1B Lower Member (Suspension Arm) 3 Body Frame 5 Bump Stopper 6 Mounting Axis 6a Nut 7 Distance Piece

Claims (1)

[Claims] 1. A bump stopper mounting structure in which a bump stopper is mounted on an upper surface of a hollow suspension arm that joins an upper member and a lower member, and the suspension is provided below the bump stopper. A distance piece sandwiched between the upper member and the lower member of the arm is arranged, and a mounting shaft for a bump stopper that supports the bump stopper has a lower end portion protruding below the lower member. Thus, the bump stopper mounting structure is characterized in that it penetrates the upper member and the lower member and is fixed on the lower surface side of the lower member.