JPH0767882B2 - 3 link type trailing arm type rear suspension - Google Patents

Description

The present invention relates to a 3-link trailing arm type rear suspension.

(Prior Art) A three-link trailing arm type rear suspension consisting of a knuckle for supporting wheels, a trailing arm, an upper arm and two front and rear lower arms is disclosed in JP-A-60-.
Known as No. 67203.

(Problems to be Solved by the Invention) According to such a suspension type, an anti-lift effect during control and acceleration can be obtained, and toe adjustment is performed by two front and rear lower arms. While the trailing arm length is determined, the toe adjustment is determined by the front and rear lower arm lengths and the way of arranging them.

Therefore, an object of the present invention is to change the angle of the semi-trailing arm along with the toe adjustment due to the length and inclination of the lower arm, and toe and anti-lift adjustments at the same time to facilitate the setting of a wide range of characteristics. The purpose of the present invention is to provide a three-link trailing arm-type rear suspension that can be adjusted dynamically.

(Means for Solving Problems) Therefore, according to the present invention, the front portion of the trailing arm (1) is pivotally supported on the vehicle body (7) and the knuckle (2) is attached to the rear portion of the trailing arm (1). A link that pivotally connects the trailing arm so as to swing up and down, and extends between the knuckle (2) and the intermediate portion (23) of the trailing arm (1) along the upper side or the lower side of the trailing arm. (21) are connected, and a rubber bush is provided at at least one of the pivotally connecting part between the trailing arm (1) and the knuckle (2) and the pivotally connecting part at the front and rear ends of the link (21). (2
The lower arm (25) on the front side is integrated in 1).

(Operation) Since the link (21) and the front lower arm (25) are integrated to form an A-shaped arm and function as a semi-trailing arm, the length of the link (21) and the lower arm (25) and the link ( By adjusting the angle of the lower arm (25) with respect to 21), toe adjustment and anti-lift adjustment can be performed in combination, and in particular, the semi-trailing arm function can enhance the anti-lift effect.

(Example) An example is described below.

In the drawings, (1) is a trailing arm, (2) is a knuckle, (5) is an upper arm, and (6) is a rear lower arm, and the trailing arm (1) is a front end at a pivotal axis in a lateral direction of the vehicle body. (7) is pivotally supported on the vehicle body, and a rubber bush with pipe (8) is interposed between the pivot shaft (7) and the trailing arm (1).

On the other hand, an upper arm (5) is connected above the knuckle (2) which supports a rear wheel (not shown), and a lower arm (6) is connected to the rear by ball joints (11) and (12), respectively.
The upper room (5) and the lower arm (6) are connected by the rubber bushes (13) and (14) with pipes to the pivot shaft (1
It is pivotally supported by the vehicle body at 5) and (16).

And at the front of the knuckle (2), the upper and lower bosses (3),
(4) is projected, and the rear end of the trailing arm (1) is connected to the upper boss (3) by a ball joint (17). The rear end of the link (21) is connected to the lower boss (4) by a ball joint (22). This link (2
Connect the front end of 1) to the middle of the trailing arm (1) with a ball joint (23).

A front lower arm (25) is integrally formed at the rear portion of the link (21), and the lower arm (25) is attached to the pivot shaft (27) in the front-rear direction via the rubber bush with pipe (26). To pivot the car body.

In the above, the rubber joint (17) for connecting the trailing arm (1) and the knuckle (2) and the rubber joint (22) (23) at the front and rear ends of the link (21) are not shown. Each bush is installed.

With this configuration, when the rear wheels are braked, the knuckle (2) swings upward around the ball joint (17) with the trailing arm (1) in the initial stage.
The braking reaction force is effectively absorbed by the compressive deformation of the rubber bushes at the front and rear ends of the link (21). Therefore, the transmission of the braking shock to the trailing arm (1) can be suppressed.

Moreover, when the compression deformation limit of the rubber bush is exceeded, the swing of the knuckle (1) around the ball joint (17) is stopped by the regulation of the link (21), and thereafter, the knuckle (2) is stopped.
Exhibits an anti-lift effect because it swings integrally with the trailing arm (1) around the pivot shaft (7) at the front end of the arm.

A rubber bush may be provided in at least one of the three ball joints (17), (22) and (23), and the link (21) is arranged above the trailing arm (1). If so, it is possible to suppress transmission of acceleration shock during acceleration in the case of a rear-wheel drive vehicle.

In particular, since the lower arm (25) on the front side of the link (21) is integrally provided to form a semi-trailing arm that forms an A-shaped arm, the pivot point () of the front end of the link (21) during rear wheel braking and acceleration ( Such a semi-trailing arm swings around a portion (▲ ▼) connecting a) and the pivot point (b) at the inner end of the lower arm (25).
That is, the semi-trailing arm exerts an anti-lift effect. Therefore, since the semi-trailing arm function and the trailing arm (1) function are combined, the anti-lift effect can be further enhanced.

Furthermore, the link (2
By adjusting the lengths of 1) and the lower arm (25) and the angle of the lower arm (25) with respect to the link (21), toe adjustment and anti-lift adjustment can be performed in combination. That is, the toe-in tendency can be strengthened by shortening the lower arm (25) and arranging the pivot point (b) of the inner end forward, and the anti-lift tendency is strengthened by arranging the line segment (▲ ▼) in front. be able to.

(Effects of the Invention) As described above, according to the 3-link type trailing arm type rear suspension of the present invention, the toe adjustment and the anti-lift adjustment are combined by the semi-trailing arm of the link and the front lower arm. It is possible to enhance the anti-lift effect.

[Brief description of drawings]

The drawing is an external perspective view of the suspension. In the drawings, (1) is a trailing arm, (2) is a knuckle, (5) is an upper arm, (6) is a rear lower arm, (21) is a link, and (25) is a front lower arm.

Claims (1)

[Claims] 1. In a rear suspension of a vehicle in which an upper arm and a lower arm are connected to a knuckle for supporting wheels, a front portion of a trailing arm is pivotally supported on a vehicle body, and a knuckle is vertically moved relative to a rear portion of the trailing arm. The trailing arm is pivotally connected so as to be swingable, and the knuckle and the intermediate portion of the trailing arm are connected by a link extending along the upper side or the lower side of the trailing arm. A three-link trailing in which a rubber bush is provided at at least one connecting portion of the connecting portion or the front and rear connecting portions of the link, and a front lower arm is formed integrally with the link. Arm type rear suspension.