JPH0427610A - Rear wheel suspension device - Google Patents

Abstract

PURPOSE:To improve adjustment workability of a toe by constituting the base end part of a trailing arm so that it may be moved in a vehicle width direction by vertical oscillation, and increasing the degree of freedom in rear wheel toe change for the suspension stroke. CONSTITUTION:A wheel supporting material 12 is supported by a vehicle body B through the first supporting member 3 of one rod type prolonged in a vehicle width direction. There is installed the second supporting member which constitutes a strut-type suspension between the wheel supporting material 12 and the vehicle body B. Also, there is mounted a trailing arm 4 with high rigidity extending in the front/rear direction of the vehicle body B between the wheel supporting material 12 and the vehicle body B. The front edge 48 (base end part) of the trailing arm 4 is provided with a moving mechanism 49. When used, the moving mechanism 49 moves the base end part of the trailing arm 4 in a vehicle width direction. As a result, the toe angle of the rear wheel to the vehicle body B displaces. It is thus possible to increase the degree of freedom in toe change and improve workability in alignment setting.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rear wheel suspension system, and in particular, in a trailing arm strand type rear suspension, it increases the freedom of toe change of the rear wheel relative to the suspension stalk, and・-Angle! This invention relates to a suspension system with improved 1ulF workability.

[Conventional technology]

Traditionally, vehicle rear wheel suspension systems have been equipped with
As shown in Japanese Patent No. 0-236812, a rear wheel is rotatably supported by a wheel support body, and the wheel support body is supported by a first support member extending in the vehicle width direction and a second support member extending in the vertical direction. A trailing arm is provided that extends in the longitudinal direction of the vehicle body, and a wheel support is relatively rotatably supported via a hair ring at the tip of the trailing arm. A trailing arm strand type rear suspension is known in which the end portion is supported by an electric body so that the tip portion can swing vertically.

This type of suspension system has the advantage of immediately generating compliance steer when an external force in the lateral or longitudinal direction is applied to the rear wheels, thereby ensuring operational safety.

[Problems that the invention attempts to solve]

By the way, in a vehicle, turning stability can be improved if the wheels are made to be able to move to the stable side during high-speed turns, for example, the rear wheel on the outside of the turn can be moved to the toe-in state, and the rear wheel on the inside of the turn can be moved to the toe-out state. It is also known that when turning at low speeds, if the outside rear wheel and the inside rear wheel are toe-out and toe-in, respectively, it is possible to turn with a small turning diameter. However, in the rear wheel suspension system described in the above-mentioned prior art publication, the base end of the trailing arm is simply connected to the vehicle body using, for example, an ordinary rubber bushing so that the distal end thereof can swing vertically. There were restrictions on the degree of freedom in alignment settings, and there was still room for improvement in this respect.

The present invention has been made in consideration of these points, and an object of the present invention is to provide a rear wheel suspension system that can expand the degree of freedom in changing toe and improve workability in setting alignment.

[Means for solving problems]

Therefore, in the rear wheel suspension system according to the present invention, a wheel support body that rotatably supports the rear wheel is elastically supported on the vehicle body by a first support member extending in the vehicle width direction and a second support member extending in the vertical direction. On the other hand, a trailing arm extending in the longitudinal direction of the vehicle body is provided, the tip of the trailing arm supports the wheel support body in a relatively rotatable manner, and the tip of the trailing arm supports the base end of the trailing arm in the vertical direction. The trailing arm is pivoted on the vehicle body so as to be swingable, and a moving mechanism is provided at the base end of the trailing arm to move the base end in the vehicle width direction by vertically swinging the arm. This is a characteristic feature.

Here, the above-mentioned moving mechanism may be any mechanism as long as it can move the toe end of the arm in the vehicle width direction by vertically swinging the trailing arm; for example, it may use a pole screw or a multi-thread screw. It can be configured as follows.

Further, the base end of the trailing arm may be supported directly on the vehicle body, or may be provided with a rubber bush or a pole bolt.

[Effect]

In the present invention, when an external force is applied to the vehicle body due to turning of the vehicle, for example, and the second support member expands and contracts, and the trailing arm of the rear wheel swings upward or downward relative to the vehicle body, the moving mechanism moves toward the trailing arm. Move the base end of the ring arm in the vehicle width direction. As a result, the toe angle of the rear wheel relative to the vehicle body is displaced. The toe change of the rear wheel can be arbitrarily set by appropriately setting the relationship between the swinging direction of the trailing arm and the base end movement direction, and the relationship between the swinging amount and the movement amount.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 3 show a rear wheel suspension system according to an embodiment of the present invention, which is applied to a strut-type independent suspension suspension for a front-engine, front-drive vehicle.

In the figure, 10 is a wheel hub integrally formed with a brake drum 11, and a brake shoe 16 is built into the brake drum 11. Further, a disc wheel I4 is removably fixed to the wheel hub 10 with a bolt.
A tire 15 is attached to the tire 4. The wheel hub [0] is rotatably supported by a spindle-shaped wheel support weight 2 via a ball bearing I3.

The wheel support I2 is supported by the vehicle body B via a single rond-shaped first support member 3 extending in the vehicle width direction. One end of the first support member 3 is pivotally attached to the lower end of the holder 122 of the wheel support 12 via a rubber bushing, and the other end is connected to the bracket 30 on the vehicle body B side via a rubber bush 31. has been done.

Further, 1. A second support member 2 constituting a strut type suspension is installed between the wheel support body 12 and the vehicle body B. The second support member 2 is composed of an outer cylinder 20, a piston rod 21 and a suspension spring 22 inserted into the outer cylinder so as to be movable in the axial direction. The lower end of the outer tube 20 is fixed to the holder 12a of the wheel support 12 by a bracket 20a. An inner cylinder 23 is bolted and fixed to the upper end of the piston loft 21, and an outer cylinder 25 is connected to the inner cylinder 23 via an elastic rubber 24.
The outer cylinder 25 is further fixed to the vehicle body B. Further, the suspension spring 22 is interposed between the outer cylinder 20 and the spring receiver 26 of the piston loft 21.

Further, between the wheel support body 12 and the vehicle body B, a vehicle body B is provided.
Trailing arm 4 with excellent rigidity that extends in the front and back direction of
is provided. A rear end (tip) 40 of this trailing arm 4 supports the wheel support 12 via a ball bearing 40a. On the other hand, a moving mechanism 49 is provided at the front end (base end) 48 of the trailing arm 4 . The moving mechanism 49 includes a damper 50 fixed to the front end 48 and a screw mechanism 51 disposed within the damper 50. The damper 50 is constructed by attaching a rubber bushing 42 between an outer cylinder 41 and an inner cylinder 43, both of which are fixed to the front end 48. The above-mentioned screw mechanism 51 is a support bracket 4 fixed to the vehicle body B.
A bolt 44 is inserted into the inner cylinder 43 and fixed with a nut 46, and the ball screw groove 44a of the bolt 44 and the inner cylinder 43 are
A large number of balls 47 are inserted between the holder 43a and the holder 43a fitted therein.
It has a structure with intervening.

Here, the bolt 44 disposed on the right side of the vehicle body B has a right ball screw, and the bolt 44 disposed on the left side of the vehicle body B has a left ball screw.

In this way, the moving mechanism 49 is configured to move the base end portion 48 of the arm 4 in the vehicle width direction by vertically swinging the trailing arm 4.

Next, the operation will be explained.

While the vehicle is running, when the steering wheel is operated to steer the front wheels and centrifugal force acts on the vehicle body B, the outer side of the vehicle body B sinks and the inner side of the vehicle body B rises. At this time, due to the action of the second support member 2, the trailing arm 4 of the rear wheel on the outside of the turn is moved upward relative to the vehicle body B, and the trailing arm 4 of the rear wheel on the inside of the turn is moved relative to the vehicle body B. It swings downward. The front end portion 48 of the trailing arm 4 rotates with respect to the bolt 44 due to the downward movement or downward swinging of the trailing arm 4, and the cough relief mechanism 51 moves the front end portion 48 of the trailing arm 4 across the vehicle width. direction (see arrow A in Figure 1), thereby displacing the toe of the rear wheels on the outside and inside of the turn to the stable side, that is, the outside of the turn is in a toe-in state, and the inside of the turn is in a toe-out state, and the toe of the rear wheel on the outside of the turn is shifted to the toe-in state and the inside of the turn is in a toe-out state. You can turn stably.

In the rear wheel suspension system of this embodiment as described above, the front end joint of the trailing arm 4 on the right side of the vehicle body B is screwed to the right, and
The front end joint of the left trailing arm 4 has a left-hand thread.
Since the front end joint portion of the trailing arm 4 is moved in the vehicle width direction as the second support member 2 expands and contracts,
The toe angle of the rear wheel changes according to the expansion and contraction stroke of the second support member 2. As a result, by appropriately selecting the pitch of the threaded portion of the bolt 44, the toe of the rear wheel can be set at an appropriate angle, and the degree of freedom in changing the toe can be greatly increased.

In addition, when manufacturing vehicles, it is necessary to adjust subtle wheel misalignments, such as errors in wheel orientation and angle, after assembly is completed on the production line, but with this rear wheel suspension system, the production line After the assembly is completed, the worker moves the trailing arm 4
When the bolt 44 of the front end 48 of the trailing arm 4 is turned, the front end 48 of the trailing arm 4 moves in the vehicle width direction, and the toe angle of the rear wheel relative to the vehicle body is displaced. As a result, adjusting the rear wheel toe can be done very easily.

In the above embodiment, the right side was a right-handed thread and the left side was a left-handed thread, but the opposite combination may be used depending on the characteristics of the vehicle.Also, in the above embodiment, a ball screw was used as the movement mechanism, but this movement The mechanism may have a structure other than the above.

[Effects of the Invention] As described above, according to the rear wheel suspension system of the present invention, the rear wheel support body is attached to the vehicle body by the first support member in the vehicle width direction and the second support member in the vertical direction. The proximal end of the trailing arm in the longitudinal direction of the vehicle body is pivotally supported on the vehicle body so that its tip can swing vertically, and the proximal end of the trailing arm is supported in the vertical direction of the vehicle body. Since a movement mechanism that moves in the vehicle width direction by rocking is provided, the degree of freedom in changing the rear wheel toe with respect to the suspension stroke can be increased, and the toe II! 1. It has the effect of improving workability.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan configuration diagram schematically showing a rear wheel suspension system according to an embodiment of the present invention, FIG. 2 is a front view of the device, and FIG. 3 is a sectional plan view showing essential parts of the device. be. In the figure, 2 is a second support member, 3 is a first support member, and 4 is a second support member.
12 is a trailing arm, 12 is a wheel support, 15 is a rear tire, 48 is a base end, 49 is a moving mechanism, and B is a vehicle body. Patent Applicant Daihatsu Motor Co., Ltd. Agent Patent Attorney Tsutomu Shimofu 1 Figure Ichigiri ] 2 ] 5 Figure 3

Claims (1)

[Claims] (1) A wheel support that rotatably supports the rear wheel is elastically supported on the vehicle body by a first support member extending in the vehicle width direction and a second support member extending in the vertical direction, while being supported in the longitudinal direction of the vehicle body. An extending trailing arm is provided, the distal end of the trailing arm supports the wheel support body in a relatively rotatable manner, and the distal end of the trailing arm is configured to be able to vertically swing at the proximal end of the trailing arm. A rear wheel suspension system, which is pivotally supported on the vehicle body, and includes a moving mechanism provided at the base end of the trailing arm to move the base end in the vehicle width direction by vertically swinging the arm.