JPH03200413A - Structure for supporting semi-trailing raw - Google Patents

Abstract

PURPOSE:To suppress vibration and secure travelling stability by providing a load receiver for receiving load in a direction of arm swinging axial line between the vicinity of a supporting part of a body and a predetermined portion of the body in the semi-trailing arm. CONSTITUTION:The semi-trailing arm 1 supports a wheel freely rotatably by a support shaft 11 as well as respective attaching legs 12, 13 in a Y-shape are pivoted to a body B via bushes 2 respectively. In such a constitution, between the vicinity of a supporting part of the body B in the arm 1 and the body B located inward with respect to a widthwise direction from the arm 1 and on an extended axial line in a swing axial line l of the arm 1, a load receiver 6 for allowing swinging of the arm 1 and receiving load functioning to the axial direction of the swinging axial line l is provided. A spring constant of a bush 62 of the load receiver 6 is set sufficiently smaller than that of the bush 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a support structure for a semi-trailing arm that supports wheels.

(Prior art) In general, a support structure for a semi-trailing arm to a body is known, for example, as shown in Japanese Utility Model Application No. E32-56305.
A rubber bushing is vulcanized and bonded between an outer cylinder fixed to the end and an inner cylinder coaxially inserted into the outer cylinder, and a flange protruding radially outward is formed at the end of the rubber bush. , the inner cylinder is bolted between opposing walls of a support bracket assembled to the body side, and the flange is placed between an axial end surface of the outer cylinder and an opposing wall of the support bracket opposite to the end surface. The bushing is interposed so as to receive a load of the semi-trailing arm on the body in a swinging direction of the semi-trailing arm and a load in a direction perpendicular to the swinging direction. .

(Problem to be Solved by the Invention) In the above semi-trailing arm support structure, if the hardness of the bushing is set high, for example, when driving, vibrations caused by unevenness on the road surface may cause the semi-trailing arm to move away from the wheels. However, if the hardness of the bushings is set low in order to solve this problem, the side force acting on the wheels when the vehicle turns, etc. However, there is a problem in that the semi-trailing arm is largely displaced in the direction of the swing axis of the semi-trailing arm with respect to the body, resulting in a decrease in steering stability.

The present invention was developed in view of the above circumstances, and the purpose is to reduce the hardness of the bushing that receives the load in the swinging direction of the semi-trailing arm, while also reducing the hardness of the bushing that acts on the semi-trailing arm. To provide a support structure for a semi-trailing arm that can reliably receive a load in the direction of the swing axis of the semi-trailing arm and suppress the amount of displacement of the semi-trailing arm in the swing axis direction. .

(Means for Solving the Problems) Accordingly, the present invention provides a support structure for a semi-trailing arm that is swingably supported on a body via a bushing, in which a portion of the semi-trailing arm in the vicinity of the support portion for the body; Swinging of the semi-trailing arm is allowed between the semi-trailing arm and the body, which is located inward in the vehicle width direction from the semi-trailing arm and substantially on an extension axis of the swing axis of the semi-trailing arm. , and is characterized in that a load receiver is installed to receive a load acting in the axial direction of the swing axis.

(Function) According to the present invention, by sufficiently reducing the spring constant of the bushing, it is possible to efficiently suppress vibrations input to the wheels when the vehicle is running from being transmitted to the body, and moreover, for example, when turning, etc. When a side force is applied to the wheel, the load receiver can reliably prevent the semi-trailing arm from being largely displaced relative to the body in the direction of the swing axis of the semi-trailing arm. Furthermore, even when the semi-trailing arm swings vertically relative to the body, the amplitude of the load receiver connected to the semi-trailing arm is small, so that the load receiver and the body or the Even if an inexpensive rubber bush is used at the connecting portion with the semi-trailing arm, it is possible to absorb the displacement of the load receiver with respect to the semi-trailing arm.

(Example) Hereinafter, an example of a support structure for a semi-trailing arm according to the present invention will be described with reference to the drawings.

In the figure, (1) is a semi-trailing vehicle that includes a support shaft (11) that supports the wheel freely in rotation, and a pair of bifurcated left and right first and second mounting legs (12, 13). an arm, the first and second mounting legs (12) (13);
The free ends of each are pivotally connected to the body (B) via the first rubber bushings (2) as follows.

That is, while a pair of support brackets (3) having a U-shaped cross section and having facing walls (31) facing each other are assembled to the body (B), the support brackets (3) are inserted into the outer cylinder (4) from the outer cylinder (4). Also has a long inner cylinder (5
) are installed coaxially inside, the first bushing (2) is vulcanized and bonded between the outer cylinder (4) and the inner cylinder (5), and the outer cylinder (4) is attached to each of the mounting legs. (12) They are fixed to the free ends of (13) by welding so that they are aligned on the same axis.

The inner and outer cylinders (5) and (4) are interposed between the opposing wall (31) of the support bracket (3), and the opposing wall (31) is interposed between the opposing wall (31) of the support bracket (3).
) A bolt (33) is inserted through the insertion hole (32) formed in the inner cylinder (5), and a bolt (33) is inserted into the insertion end of the bolt (33).
34) to fix the inner cylinder (5) to the support bracket (3), thereby attaching the semi-trailing arm (1) to the body (B) and the support bracket (3).
), so that as the semi-ring arm (1) swings, a spring reaction force in a torsional direction acts on the first bush (2).

In the above configuration, the semi-trailing arm (1) is located near the supporting portion of the body (B) and inwardly of the semi-trailing arm (1) in the vehicle width direction. (1) Swing axis (
between the semi-trailing arm (1) and the body (B) located approximately on the extended axis of the semi-trailing arm (1), and which allows the semi-trailing arm (1) to swing and bears the load acting in the axial direction of the swing axis. A load receptor (6) was constructed.

That is, in the embodiment shown in the figures, the first mounting leg (12) is disposed on the inner side in the vehicle width direction of the semi-trailing arm arm (1) and is located at a position adjacent to the outer cylinder (4). A connecting flange (14) is provided that projects upwardly, and a through hole (15) is formed in the connecting flange (14). A connecting bracket (
7) is fixed, and the through hole (
71).

The load receiver (6) is formed by a rod (60) integrally provided with a small diameter shaft portion (61) at both lengthwise ends thereof, and four rods each having a spring constant higher than that of the first bush (2). The second rubber bush (62) and the same four washers (6
3) and two nuts (64) that can be screwed onto the small diameter shaft portion (61), and a washer (63) and a second bush (64) are attached to each of the small diameter shaft portions (61), respectively. 62), and then insert the small diameter shaft portion (61) into the through hole (15) of the connection flange (14) and the connection bracket (7).
) (71), further insert the second bush (62) and washer (63) into the insertion end, and then insert the nut (64) into the shaft end of the small diameter shaft (61). By screwing, the load receiver (6) is attached to the first mounting leg (1).
in the vicinity of the support part for the body (B), and inward in the vehicle width direction from the semi-trailing arm (1) and approximately on the extended axis of the swing axis of the semi-trailing arm (1). It was constructed between the body (B) and the body (B) located therein.

However, in the support structure for a semi-trailing arm having the above configuration, the swing axis of the semi-trailing arm (1) with respect to the body (B) is fixed when the vehicle suddenly starts, for example. (When the first bushing (2) is moved in a direction substantially perpendicular to the semi-trailing arm (1), the first bushing (2) is deflected substantially in the radial direction, and the movement of the semi-trailing arm (1) is absorbed by the first bushing (2). For example, when the semi-trailing arm (1) swings approximately vertically relative to the body (B) due to bounce of the vehicle, a torsional spring reaction force acts on the first bush (2). The first bushing (2) absorbs the vertical swing of the semi-trailing arm (1), while at the same time applying side force to the semi-trailing arm (1) when the vehicle turns, etc. acts, the semi-trailing arm (1) will almost touch the body (B).
) tries to move in the direction of the rocking axis (ri), but the movement in the axial direction is received by the load receiver (6),
the second bush (62) constituting the load receiver (6);
It is absorbed by the second bush (6
Since the hardness of 2) is set high, the swing axis () of the semi-trailing arm (1) relative to the body (B)
) displacement in the direction will be suppressed.

For example, when the semi-trailing arm (1) swings substantially vertically relative to the body (B) due to bounce of the vehicle, a torsional spring reaction force acts on the first bush (2). The first bushing (2) absorbs the vertical swing of the semi-trailing arm (1), and due to the vertical swing of the semi-trailing arm (1), the load receiving The rod (60) constituting the body (6) can also swing approximately vertically using the attachment site on the body (B) side as a fulcrum. However, in the above embodiment, the connecting position of the rod (60) on the semi-trailing arm (1) side is
Since the length of the rod (60) is relatively long near the swing axis of the rod (60), the amplitude of the rod (60) is very small, so that the semi-trailing arm of the rod (60) (1) and the body (B) without using an expensive joint member such as a ball joint, the rod ( 60) can be reliably absorbed.

Thus, as in the embodiment, for example, the second bush (6
By making the hardness of the first bushing (2) higher than that of the first bushing (2), it is possible to efficiently suppress the vibration input to the wheels when driving, for example, from being transmitted to the body, while also suppressing the effects of side force, for example. At the same time, the running stability of the vehicle can be ensured.

In the above embodiment, the second bush (63) is interposed at each connecting portion of the rod (60) constituting the load receiver (6) with the semi-trailing arm (1) and the body (B). However, the connection portion between the rod (60) and the semi-trailing arm (1) may be rigidly connected.

(Effects of the Invention) As described above, the present invention provides a support structure for a semi-trailing arm that is swingably supported on a body via a bushing, in which a portion of the semi-trailing arm near the support portion for the body and a portion of the semi-trailing arm that is The semi-trailing arm is allowed to swing between the body and the body, which is located inward in the vehicle width direction than the trailing arm and substantially on an extension axis of the swing axis of the semi-trailing arm, and the swing By installing a load receiver that takes on the load acting in the axial direction of the dynamic axis, the spring constant of the bushing can be made sufficiently small to efficiently suppress vibrations input to the wheels when the vehicle is running from being transmitted to the body. However, if a side force is applied to the wheel during turning, for example, the semi-trailing arm will be largely displaced in the direction of the swing axis of the semi-trailing arm relative to the body at the load receiver. It is possible to reliably prevent this from occurring and ensure the running stability of the vehicle.

Further, according to the present invention, even when the semi-trailing arm swings in the vertical direction relative to the body, the amplitude of the load receiver connected to the semi-trailing arm is small, so that the load receiver and the body Alternatively, the displacement of the load receiver with respect to the semi-trailing arm can be absorbed by the inexpensive rubber bush shown in the embodiment without using an expensive pole shield at the connecting portion with the semi-trailing arm. becomes possible.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of a semi-trailing arm support structure according to the present invention, and FIG. 2 is a partially cutaway plan view showing an enlarged main part. (1)...Semi-trailing arm (2)...
...First Butsuyu (Butsu) (6)...
Load receiver (B)...Body 4 B

Claims (1)

[Claims] 1) A support structure for a semi-trailing arm that is swingably supported on a body via a bush, the semi-trailing arm having a support structure for the semi-trailing arm that includes:
allowing the semi-trailing arm to swing between the body and the body, which is located inward in the vehicle width direction from the semi-trailing arm and substantially on an extension axis of the swing axis of the semi-trailing arm; A support structure for a semi-trailing arm, characterized in that a load receiver is installed to receive a load acting in the axial direction of the swing axis.