JPH01101210A - Suspension device for vehicle - Google Patents

Abstract

PURPOSE:To suppress change in camber and ensure lateral rigidity by extending a pair of lateral links in the cross direction on the rear side of a car body from a torsion beam, wherein one end is connected to a trailing arm and the other end oscillatably connected to the car body in the vertical direction. CONSTITUTION:On the rear side of a car body from a torsion beam 7, a pair of lateral links 8, 8 are extended in the cross direction. One end of the lateral link 8 is vertically oscillatably connected to the lower part of the car through a bracket 3 and the other end is connected to a trailing arm through a bush holding cylinder 10 and a holding pin 12. The bush holding cylinder 10 has an elastic bush 11 comprising a hard body 11a and a soft body 11b. Thus, the lateral link 8 is vertically oscillated by a roll or the like and thereby the force applied to the elastic bush 11 of the bush holding cylinder 10 is absorbed by the extensibility of the soft body so as to suppress change in camber.

Description

[Detailed description of the invention] (Industrial application field) TECHNICAL FIELD The present invention relates to a suspension device for a vehicle.

(Prior art) For vehicle suspension systems, the U.S. Pat.
As shown in Publication No. 7, a pair of trailing arms are swingably supported on both sides of the vehicle body in the vehicle width direction, and a wheel is rotatably supported on each of the trailing arms at the rear side of the vehicle body. There is one in which the trailing arm is connected via a torsion beam on the side closer to the swing axis of the trailing arm than the support point of the wheel.

In such a suspension device.

The closer the arrangement of the torsion beam is to the pivot axis (pivot axis) of the trailing arm, the smaller the change in the camber angle becomes. It is superior to the axle beam method.

(Problem to be Solved by the Invention) However, in the axle beam system, both ends of each trailing arm are supported by the vehicle body and the torsion beam, whereas in the above suspension system, the torsion beam is located at the support point of the wheel. Since it is disposed at the front of the vehicle body, the supporting point side of the wheel on each trailing arm is cantilevered, and the lateral force during turning is inevitably inferior to the axle beam system.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a suspension suspension device that can minimize camber change and ensure sufficient lateral rigidity.

(Means and operations for solving the problem) In order to achieve the above object, in the present invention, a pair of trailing arms are swingably supported on both sides of the vehicle body in the vehicle width direction, and each of the trailing arms is Each wheel is rotatably supported by the ring arm at the rear of the vehicle body,
In a vehicle suspension device in which both trailing arms are connected via a torsion beam on the swing axis side of the trailing arm from the support point of the wheel, a pair of lateral links are provided behind the torsion beam in the vehicle body. Each lateral link is arranged to extend in the vehicle width direction, and one end of the lateral link is supported by the vehicle body so as to be swingable in the vertical direction, and the other end of the lateral link is connected to the vehicle body through an elastic bush. This configuration is connected to each trailing arm, respectively.

With the above configuration, the torsion beam can be brought closer to the swing axis of the trailing arm, while each lateral link can move each trailing arm without hindering the vertical swing of each trailing arm. is supported in the vehicle width direction, making it possible to minimize camber changes and ensuring sufficient lateral rigidity.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 to 4, reference numeral 1 indicates a suspension 981 according to the present invention, and the suspension 981 is used as a rear suspension for front-wheel drive vehicles such as commercial vehicles.

In this suspension device 1, a pair of trailing arms 3 are arranged on both sides of the vehicle body 2 in the vehicle width direction (in the left-right direction in FIG. 1) so as to extend in the longitudinal direction of the vehicle body (in the vertical direction in FIG. 1). (one side is shown in the figure), each trailing arm 3 has a front part 3a (hereinafter referred to as the front end) of the vehicle body attached to a bracket 4 at the bottom of the vehicle body 2, as shown in FIG. The rear wheels 5 are rotatably supported on the vehicle rear side portion 3b. As shown in FIG. 2, a shock absorber 6 is disposed between each trailing arm 3 and the lower part of the vehicle body 2 so as to extend in the vertical direction, and one end of each shock absorber 6 is attached to the trailer. The shock absorber 6 is connected to the ring arm 3, and the other end of each shock absorber 6 is connected to the lower part of the vehicle body 2. Both trailing arms 3.

Both ends thereof are rigidly connected via a torsion beam 7, and the axis of the torsion beam 7 and the pivot axis (pivot axis) O of each trailing arm 3 coincide with each other.

A pair of lateral links 8 are disposed behind the torsion beam 7 (lower in FIG. 1) of the vehicle body so as to extend in the vehicle width direction. Each lateral link 8 has one end supported at the bottom of the vehicle body 2 via a bracket 9 so as to be able to swing vertically, and a bushing holding cylinder lO is provided at the other end with its axis directed in the longitudinal direction of the vehicle body. It is being An annular elastic bushing 11 is held in the bushing holding cylinder lO.The elastic bushing 11 is entirely formed of a hard body 11a as shown in FIG. A soft body flb that is softer than the body 11a is provided. The soft body 11b is provided on the opposite side of the lateral link 8 across the inner periphery of the elastic bushing 11, and the soft body flb extends along the inner periphery of the elastic bushing 14. This results in
When a force is applied to the elastic bushing 11 from the inner circumferential side of the elastic bushing 11 to the soft body 11b side, the inner circumferential side of the elastic bushing 11 moves outward in the vehicle width direction (leftward in FIG. 3). The elastic bush 11 stretches relatively easily toward
When a force is applied from the inner peripheral side of the elastic bushing 11 to the lateral link 8 side, the elastic bushing 11 hardly deforms inward in the vehicle width direction (rightward in FIG. 3). There is. A holding pin 12 is disposed in the movement area of each bush holding cylinder 1 (L) as each lateral link 8 swings.
is held by each trailing arm 3. Each of the holding pins 12 extends in the longitudinal direction of the vehicle body, and as shown in FIG.
The inner circumferences of the elastic bushes 11 are respectively fitted.

Therefore, in the suspension device 1 mentioned above, if the suspension device 1 is in a rolled state or only one wheel rides on an uneven surface, the left and right wheels will stroke in opposite directions, and as a result, the lateral link 8 swings up and down, and the bushing holding cylinder lO attempts to move up and down as shown by the imaginary line in FIG. In this case, the inner periphery of the elastic bushing 11 in the bushing holding cylinder 10 receives force outward in the vehicle width direction via the holding pin 12, and the inner periphery of the elastic bushing 11 receives force in the same direction. Soft body fl
b, and the force exerted by the holding pin 12 is absorbed. As a result, each trailing arm 3 will be able to swing vertically about the swing axis O of the trailing arm 3 without any hindrance, and this will be due to the difference in phase between the two trailing arms 3. The torsion beam 7 will be twisted. This twisting generates a repulsive force, which acts as a stabilizer, and at this time, there is almost no camber change based on the vehicle body 2, as in the past.

On the other hand, when turning, the trailing arm 3 receives a lateral force, and this force acts inward in the vehicle width direction on the elastic bushing 11 via the holding pin 12. In some cases, the elastic bushing 11 does not deform due to its rigidity, so that the lateral link 8
The torsion beam 7 supports the trailing arm 3 in the vehicle width direction, ensuring sufficient lateral rigidity.

FIGS. 5 and 6 show other embodiments. In this embodiment, the same components as those in the previous embodiment are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, the front end 3a of one of the trailing arms 3 is an annular body as shown in FIG.
is formed. One end of the torsion beam 7 is rotatably fitted to the inner periphery of the front end 3a, and the other end is rigidly connected to the other trailing arm 3, as described above. This torsion beam 7 has
A protrusion 16 is provided on the outer periphery of one end thereof, and the protrusion 16 projects into the notch 15 as shown in FIG. In this embodiment, when the trailing arm 3 swings in the vertical direction within a certain stroke amount Ill, the notch surface 15a of the trailing arm front end 3a comes into contact with the projection 16. If the trailing arm 3 swings in the vertical direction by a fixed stroke amount of 21 or more, the trailing arm 3
The cutout surface 154 contacts the protrusion 16 to rotate the torsion beam 7 about its axis.

Therefore, as shown in FIG. 6, when the trailing arm swings within a constant stroke range 1, the torsion beam 7 is not twisted and the repulsive force of the torsion beam 7 is not obtained. In this case, shocks from the road surface are absorbed by a shock absorber and a coil spring.

On the other hand, if the trailing arm 3 oscillates by more than a certain stroke amount, the torsion beam 7 will be twisted, and the repulsive force of the torsion beam 7 will change as the stroke amount increases, as shown in FIG. This will result in an increase.

In this way, in the above embodiment, the repulsive force based on the torsion beam 7 can be adjusted in two steps.

Although the embodiments have been described above, the present invention includes the following.

■Applying the present invention to a coupled link axle.

■In order to make the elastic bushing 11 soft on the outer side in the vehicle width direction and hard on the inner side in the vehicle width direction,
Select multiple materials as appropriate.

(2) The portion of the elastic bushing 11 corresponding to the soft body 11b is made into a void.

(Effects of the Invention) As described above, the present invention can minimize camber change and ensure sufficient lateral rigidity.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram explaining one side of the suspension device according to the present invention in plan view, Fig. 2 is an explanatory diagram explaining one side of the suspension device according to the present invention from the side of the vehicle body, and Fig. 3 is an explanatory diagram explaining one side of the suspension device according to the present invention from the side of the vehicle body. FIG. 4 is an explanatory diagram illustrating the suspension device according to the present invention viewed from the rear side of the vehicle body; FIG. 5 is an enlarged longitudinal section showing another embodiment; figure. FIG. 6 is a characteristic diagram showing the relationship between the repulsive force based on the torsion beam and the stroke amount of the trailing arm. l: Suspension device 2: Vehicle body 3: Trailing arm 5: Rear wheel 7: Torsion beam 8 Nilatiral link ll Bi-elastic bush 0: Swing axis

Claims (1)

[Claims] (1) A pair of trailing arms are swingably supported on both sides of the vehicle body in the vehicle width direction, a wheel is rotatably supported on each trailing arm on the rear side of the vehicle body, and both the trailing arms are connected to the In a suspension system for a vehicle that is connected via a torsion beam on the swing axis side of the trailing arm from the support point of the wheel, a pair of lateral links extends in the vehicle width direction behind the torsion beam. Each of the lateral links is arranged such that one end of the lateral link is vertically swingably supported by the vehicle body, and the other end of the lateral link is connected to each of the trailing arms via an elastic bush. A vehicle suspension device characterized by: