JP3301205B2 - Mounting structure of torsion bar spring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for connecting a torsion bar spring and a connecting member employed in a vehicle suspension system.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 59-67644 discloses an intermediate portion of a torsion bar spring with the intention of reducing the torsion bar spring in an axial direction when a load is applied to the torsion bar spring in the axial direction. It is shown that the portion is provided with an overlapped coupling portion capable of transmitting torque and sliding in the axial direction.

[0003]

In the conventional torsion bar spring described above, although the body of the vehicle can be easily deformed in the same direction by reducing the torsion bar spring in the axial direction, the torsion bar spring does not have the shaft. When a load in the direction is applied, when the connecting member that connects the end of the torsion bar spring to the suspension component or the vehicle body component comes off, the connecting member is rotated by the torsional force applied to the torsion bar spring in advance. The vehicle body and other members may be damaged, and needless repair may be required. In addition, since the sliding portion is provided at the center of the torsion bar spring, a portion having low strength against torsional force is formed, and the strength can be maintained against bending force due to manufacturing errors, assembly errors, and the like. There was no problem. SUMMARY OF THE INVENTION The present invention has been made to address the above-described problem, and has as its object to reduce the strength of the torsion bar spring and to connect the torsion bar spring when an axial load acts on the torsion bar spring. An object of the present invention is to release the connection between the end portion and the connecting member within the connecting member so as to eliminate the torsional force applied to the torsion bar spring in advance.

[0004]

Was to achieve the above object, there is provided a means for solving]
Therefore, according to the present invention, the front end of the suspension
Can be transmitted and cannot move in the axial direction.
Able to transmit torque by applying a constant torsional force and move in the axial direction
Torsion bar splint connected to body components as possible
The torsion bar spring
The connecting member connecting the rear end of the
At the front end of the
When a load is applied, the axis of the torsion bar spring
A torque release part that allows rotation with
And the torsion bar spring assembly structure
To provide.

[0005]

In the structure for assembling a torsion bar spring according to the present invention, an axial load acts on the torsion bar spring and the connecting end of the torsion bar spring moves in the connecting member in the axial direction. Then, when the connecting end of the torsion bar spring is disengaged from the torque connecting portion of the connecting member and moves to the torque releasing portion, the torque transmitting connection between the torsion bar spring and the connecting member is released in the connecting member, The torsion bar spring rotates without load, and the torsional force applied to the torsion bar spring in advance disappears. Therefore, not only does the torsion bar spring rotate in the unloaded state, the surrounding members are not involved, but also the connecting member is not rotated by the torsion bar spring thereafter, and the vehicle body and other components are not rotated by the rotation of the connecting member. Damage to the members can be prevented. Also, since the weak part is not on the torsion bar spring,
The strength against torsional force can be ensured, and the strength against bending force due to manufacturing errors and assembly errors can be ensured. Also,
In the assembling structure according to the present invention, when the resistance applying means for applying resistance when the torsion bar spring moves in the axial direction is provided, the resistance is applied by the resistance applying means when the torsion bar spring moves in the axial direction. Part of the axial load acting on the bar spring can be absorbed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an anchor arm 20 as a connecting member connecting a connecting structure according to the present invention to each torsion bar spring 10 employed in a front suspension device of a vehicle and a rear connecting end 11 thereof.
An example in which the present invention is applied to the connection structure of FIG. In this embodiment, the torsion bar spring 10 is disposed to extend in the front-rear direction of the vehicle body, and is formed at the rear connecting end 11 via an anchor arm 20, a swivel 31, an anchor bolt 32, a nut 33 and a swivel 34. The base 41 of the upper arm 40, which is a suspension component, is connected to a member (not shown) via a bracket 35 at the front connection end 12 (connected to the vehicle body component so as to be vertically swingable). , And a torsional force for urging the distal end 42 of the upper arm 40 downward by rotating the anchor arm 20 upward by the anchor bolt 32 and the nut 33 is applied in advance. . The torsion bar spring 10
The front and rear connecting portions of each boot 36, as shown in FIG.
37 (not shown in FIG. 2), the front connecting end 12 of the torsion bar spring 10 and the bracket 35 are splined so as to transmit torque and not move in the axial direction as shown in FIG. Mated.

In this embodiment, the connecting cylinder 21 of the anchor arm 20 with the torsion bar spring 10 is spline-connected with the rear connecting end 11 of the torsion bar spring 10 so as to transmit torque and move in the axial direction. And a torque releasing portion 21b provided on the moving direction (rear) side of the torque connecting portion 21a and allowing rotation and axial movement of the rear connecting end 11 of the torsion bar spring 10. An engaging member 22 is assembled between the torque connecting portion 21a and the torque releasing portion 21b, and a stopper member 23 is firmly fixed to the rear end of the torque releasing portion 21b by caulking. The engaging member 22 is a C-shaped spring clip having an outer diameter larger than the inner diameter of the torque release portion 21b and capable of engaging with the rear end surface of the torsion bar spring 10, as shown in FIGS. , Torque connecting portion 2 of connecting cylindrical portion 21
1a and an annular groove 21c provided between the torque releasing portion 21b. The torsion bar spring 10 is axially moved by the rearward axial movement, and slides between the inner walls of the torque releasing portion 21b. Is caused.

In this embodiment constructed as described above, during normal use, the torsion bar spring 10 and the bracket 35 are connected so as to transmit torque as shown in FIG. Reference numeral 20 is connected so as to transmit torque, so that the torsional force applied to the torsion bar spring 10 is transmitted to the upper arm 40 of the front suspension device.

In this embodiment, when an axial load of a predetermined value or more acts on the torsion bar spring 10 due to a collision of the vehicle, as shown in FIG. The portion 11 engages with the engaging member 22 and the anchor arm 2 together with the engaging member 22.
0 moves in the axial direction within the connecting cylindrical portion 21. At this time, the engagement member 22 and the torque release portion 21b
A sliding resistance occurs between the torsion bar springs 10
When a part of the axial load acting on the torsion bar spring 10 is absorbed and the rear connection end 11 of the torsion bar spring 10 is disengaged from the torque connection portion 21a of the connection cylinder 21 and moves to the torque release portion 21b, the torsion bar Spring 1
0 and the connecting cylinder 21 are capable of transmitting torque.
1, the torsion bar spring 10 rotates without load, and the torsional force previously applied to the torsion bar spring 10 disappears. For this reason, not only does the surrounding member not get caught by the rotation of the torsion bar spring 10 in the no-load state, but also the connecting tubular portion 21 is not rotated by the torsion bar spring 10 thereafter. Damage to the vehicle body and other members due to rotation of the anchor arm 20 can be prevented. In this embodiment, since the stopper member 23 is fixed to the rear end portion of the connecting cylinder 21, the torsion bar spring 10 with respect to the connecting cylinder 21 is brought into contact by the engagement member 22 abutting against the stopper member 23. Axial movement is regulated.

Further, according to the present embodiment, since a normal torsion bar spring can be used as the torsion bar spring 10, the strength against torsional force can be ensured. Alternatively, the strength against the bending force acting on the torsion bar spring 10 due to an assembling error between the bracket 35 and the connecting tubular portion 21 or the like can be secured.

In the above embodiment, the C-shaped clip 22 mounted on the annular groove 21c is employed as an engaging member as a resistance applying means for applying resistance when the torsion bar spring 10 moves in the axial direction. As shown in the figure, the plate 12 which has a guide 122a on its outer peripheral portion for generating sliding resistance between the torque releasing portions 21b and is attached to a step portion between the torque connecting portion 21a and the torque releasing portion 21b.
It is also possible to adopt the embodiment 2 as an engaging member.

In the above embodiment, the engaging member (C-shaped clip 22 or plate 122) is employed as a resistance applying means for applying resistance when the torsion bar spring 10 moves in the axial direction. What is necessary is just to apply an axial resistance to the torsion bar spring, and for example, a configuration that applies an axial elastic force like an elastic body (spring, rubber, or the like) may be used. Further, in the above-described embodiment, the example in which the resistance applying means is provided in the connecting cylinder portion 21 of the anchor arm 20 as the connecting member has been described, but the resistance applying means may be provided anywhere, for example, torsion. The resistance applying means may be provided between an engaging member provided in the middle of the bar spring and an engaging member provided on the vehicle body side.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vehicle front suspension device embodying the present invention.

FIG. 2 is a partially broken side view showing a main part of FIG.

FIG. 3 is an enlarged cross-sectional view illustrating a relationship between a connecting cylinder and an engagement member illustrated in FIG. 2;

FIG. 4 is a perspective view of the engagement member shown in FIGS. 2 and 3;

FIG. 5 is an operation explanatory view of a main part of FIG. 2;

FIG. 6 is a diagram corresponding to FIG. 3, showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Torsion bar spring, 11 ... Rear connection end part, 20 ... Anchor arm (connection member), 21 ... Connection cylinder part, 21a ... Torque connection part, 21b ... Torque release part, 2
2 ... engaging member, 23 ... stopper member.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 1/00-6/00 B60G 11/20

Claims (2)

(57) [Claims] 1. The front end of the suspension component is
It can be connected to transmit torque and cannot move in the axial direction.
A predetermined torsional force can be applied to transmit torque and move in the axial direction.
Torsion bar spring movably connected to vehicle body components
The torsion burst spring
To the connecting member that connects the rear end of the
Axial direction above the specified value at the front end of the torsion bar spring
Of the torsion bar spring when the load of
An assembling structure of a torsion bar spring, wherein a torque releasing portion that allows rotation with movement in a direction is provided. 2. The assembling structure of a torsion bar spring according to claim 1, further comprising resistance applying means for applying resistance when the torsion bar spring moves in the axial direction.