JPS629443B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an independent suspension system for a vehicle, and more particularly to an independent suspension system for a vehicle that improves steering stability by changing the toe angle of a wheel toward toe-in during braking.

2. Description of the Related Art Conventional independent suspension systems for vehicles include those shown in FIGS. 1 and 2, for example. 1st
In the figures and FIG. 2, reference numeral 1 indicates an independent suspension system for the left rear wheel of a front-wheel drive vehicle. The independent suspension system 1 is
The vehicle includes a strut 2 extending substantially in the vertical direction of the vehicle body, a radial rod 3 extending substantially in the longitudinal direction of the vehicle body, and a pair of lateral links 4 and 5 extending substantially in the lateral direction of the vehicle body and arranged parallel to each other at the front and rear of the vehicle body. The strut 2 has an upper end swingably attached to the vehicle body (not shown) via an elastic body 6, and a lower end fixed to a wheel support part 8 that rotatably supports the left rear wheel 7.
It mainly supports the force that is input to the vehicle body generally in the vertical direction of the vehicle body. A spindle 9 that serves as an axle for the wheel 7 is provided protruding from the wheel support portion 8 . The radius rod 3 has a cylindrical shape and has cylindrical members 10 and 11 having axes perpendicular to the axis of the radius rod 3 at both ends.
is fixed, and the front end swings to the vehicle body (not shown) through rubber bushings (not shown) inserted and fixed into the cylindrical members 10 and 11, respectively, and bolts (not shown) coaxially inserted into the rubber bushings. The rear end is swingably attached to the wheel support part 8. Radius slot 3 is wheel 7
It mainly supports the force that is input to the vehicle body generally in the longitudinal direction of the vehicle body. The lateral links 4 and 5 are cylindrical members of equal length, each having an axis perpendicular to the axis of the lateral links 4 and 5 at both ends.
13, 14, and 15 are fixed, and cylindrical rubber bushes (not shown) are inserted and fixed into the cylindrical members 12, 13, 14, and 15, respectively.
The lateral link 4 on the front side of the vehicle body is swingably attached to the vehicle body (not shown) by a bolt (not shown) coaxially inserted into a cylindrical rubber bushing in the cylindrical member 12 at its inner end, and attached at its outer end to the vehicle body (not shown) by a bolt (not shown) coaxially inserted into a cylindrical rubber bushing in the cylindrical member 12. It is swingably attached to the front part of the wheel support part 8 by a bolt (not shown) coaxially inserted into a cylindrical rubber bush.
The lateral link 5 on the rear side of the vehicle body is attached to the vehicle body (not shown) using the same bolt that attaches the inner end of the lateral link 4 on the front side of the vehicle body, whose inner end is coaxially inserted into a cylindrical rubber bushing in the cylindrical member 14. The outer end of the lateral link 4 on the front side of the vehicle body, whose outer end is coaxially inserted into a cylindrical rubber bushing in the cylindrical member 15, is attached to the wheel support part 8 by the same bolt. It is swingably attached to the rear of the 8. Lateral link 4,5
mainly supports the force input from the wheels 7 to the vehicle body in a substantially lateral direction of the vehicle body.

However, in such a conventional vehicle independent suspension system 1, during braking, the braking force F
When this acts on the rear wheel 7 toward the rear of the vehicle body, the entire suspension system 1 is displaced due to the deformation of the rubber bushing, and the rear wheel 7
is tilted as shown in the dashed line in Fig. 1, and the rear wheel 7
The toe angle changes to the toe-out side. For this reason,
There was a problem in that braking during a turn could easily lead to unstable steering.

This invention has been made by focusing on such conventional problems, and includes an auxiliary link that connects the front end of the radius slot and the inner end of the lateral link on the front side of the vehicle body. By tilting the axial direction of the elastic bush whose inner end is attached to the vehicle body with respect to the vehicle body direction so that the rear side of the vehicle body faces inward, the toe angle of the wheel is tilted toward the toe-in side when braking force is applied to the wheel. It is an object of the present invention to provide an independent suspension system for a vehicle that improves the steering stability of the vehicle, thereby solving the above-mentioned problems.

The present invention will be explained below based on the drawings.

FIG. 3 is a diagram showing an embodiment of the present invention. First, the configuration will be explained. Reference numeral 21 indicates an independent suspension system for the left rear wheel of the front-wheel drive vehicle of this embodiment. The independent suspension system 21 includes a strut 22 serving as a guide member extending substantially in the vertical direction of the vehicle body, a radius rod 23 extending substantially in the longitudinal direction of the vehicle body, and a pair of lateral links extending substantially in the lateral direction of the vehicle body and arranged parallel to each other at the front and rear of the vehicle body. 24, 25. The upper end of the strut 22 is swingably attached to the vehicle body (not shown) via an elastic body, and the lower end is fixed with a wheel support portion 27 that rotatably supports the left rear wheel 26. Mainly supports forces input in a substantially vertical direction. A spindle 28 that serves as an axle for the left rear wheel 26 is protruded from the wheel support portion 27 .

The lateral links 24 and 25 have a cylindrical shape with equal length, and the outer end of the lateral link 24 on the front side of the vehicle body and the both ends of the lateral link 25 on the rear side of the vehicle body have axes perpendicular to the axes of the lateral links 24 and 25. Cylindrical members 29, 30, and 31 are each fixed to the inner end of the lateral link 24 on the front side of the vehicle body.
A cylindrical member 32 is fixed to the cylindrical member 32, the shaft of which is inclined by θ with respect to the longitudinal direction of the vehicle body, and the rear side of the shaft faces inward of the vehicle body. Cylindrical members 29, 30, 31, 32
A cylindrical rubber bush (not shown) is coaxially inserted and fixed inside each of them. That is, the cylindrical rubber bushing inserted into the cylindrical member 32 is inclined by θ with respect to the longitudinal direction of the vehicle so that the rear side of the axis of the bush faces inward of the vehicle body. These cylindrical rubber bushes have a spring constant in the axial direction that is smaller than a spring constant in the radial direction because the deformation in the axial direction is shear deformation and the deformation in the radial direction is compression and expansion. The inner ends of the lateral links 24 and 25 are swingably attached to a vehicle body (not shown) by two bolts (not shown) coaxially inserted into cylindrical rubber bushes in the cylindrical members 30, 32, respectively. The outer ends of the lateral links 24 and 25 can be pivoted to the front or rear of the wheel support section 27 by a single bolt (not shown) coaxially inserted into a cylindrical rubber bushing in the cylindrical members 29 and 31. Installed. The lateral links 24 and 25 mainly support the force that is applied to the vehicle body from the wheels 26 in a substantially lateral direction of the vehicle body. A cylindrical member 33 having an axis perpendicular to the axis of the radius rod 23 is fixed to the front end of the radius rod 23. A cylindrical rubber bushing (not shown) is coaxially inserted and fixed into the cylindrical member 33. It is swingably attached to the vehicle body (not shown) by a bolt (not shown) that is coaxially inserted into the body.
The rear end of the radius rod 23 is fixed to the outer end of a lateral link 24 on the front side of the vehicle body by bolts, welding, or the like. Radius slot 23 is wheel 26
It mainly supports the force that is input to the vehicle body from the front and back in the approximately longitudinal direction of the vehicle body. Reference numeral 34 denotes an auxiliary link, which has both ends fixed to the front end of the radius rod 23 and the inner end of the lateral link 24 on the front side of the vehicle body, and has an axis substantially parallel to the axis of the cylindrical member 32 at the inner end of the lateral link 24. It seems to be extending. Arrow A indicates the front of the vehicle, and arrow B indicates the left side of the vehicle.

The independent suspension system 21 configured as described above operates as follows. During braking, when the braking force F acts on the left rear wheel 26 toward the rear of the vehicle body, the lateral link 2
A pulling force acts on the outer ends of the wheels 4 and 25 via the wheel support portion 27 toward the rear of the vehicle body. The force that pulls the outer end of the lateral link 24 on the front side of the vehicle body toward the rear side of the vehicle body is transferred to the lateral link 2 because the lateral link 24, the radius slot 23, and the auxiliary link 34 are fixed, and the auxiliary link 34 plays the role of transmitting the force.
4 and pushes the inner end toward the rear of the vehicle. For this reason, the rubber bush that attaches the inner end of the lateral link 24 to the vehicle body is displaced in the axial direction due to its small axial spring constant. , the cylindrical member 32 is moved toward the rear of the vehicle body in the axial direction (inclined at an angle θ with respect to the longitudinal direction of the vehicle body). Therefore, the inner end of the lateral link 24 moves toward the rear of the vehicle body as shown by the dashed line, and also moves slightly toward the inside of the vehicle body.
As a result, the outer end of the lateral link 24 on the front side of the vehicle body moves toward the inside of the vehicle body relative to the outer end of the lateral link 25 on the rear side of the vehicle body. The wheel support part 27 is
The outer end of the lateral link 24 and the lateral link 25
Due to the relative displacement with the outer end of the strut 22, the strut 22 is rotated slightly clockwise in FIG. Tilt the vehicle body inward by an angle δ. As a result, the toe angle of the left rear wheel 26 is inclined toward the toe-in side, and steering stability can be ensured even when braking is performed while the vehicle is turning.

FIG. 4 shows an independent suspension system for a vehicle according to another embodiment of the invention. In the independent suspension system 21 of this embodiment, the radius slot 23
A cylindrical member 35 having an axis perpendicular to the axis of the radius rod 23 is fixed to the rear end, and a cylindrical rubber bush (not shown) is coaxially inserted and fixed into the cylindrical member 35. radius slot 35
The rear end is swingably attached to the lower part of the wheel support part 27 by a bolt (not shown) coaxially inserted into a cylindrical rubber bush.

During braking, when the braking force F acts on the wheels 26 toward the rear of the vehicle body, this braking force F is applied to the wheel supports 27,
It is transmitted to the auxiliary link 34 via the radius slot 23. The auxiliary link 34 pushes a cylindrical rubber bush (not shown) in the cylindrical member 32 provided at the inner end of the lateral link 24 on the front side of the vehicle body in the axial direction toward the rear of the vehicle body, and moves the lateral link 24 in the axial direction of the cylindrical member 32 on the vehicle body. Move it to the rear. As a result, the lateral link 24 moves slightly toward the rear and inside of the vehicle body. Since the other configurations and operations in FIG. 3 are the same as those in the embodiment shown, corresponding parts are given the same reference numerals and explanations will be omitted.

It goes without saying that the independent suspension system for the right rear wheel is constructed similarly to the independent suspension system of the embodiment shown in FIG. 3 or 4.

As explained above, according to this invention,
A guide member whose one end is swingably attached to the vehicle body and whose other end is connected to a wheel support part that rotatably supports the wheel, and which extends substantially laterally to the vehicle body and whose inner end is swingable to the vehicle body via an elastic bushing. The outer end is attached to the front or rear of the wheel support so that it can swing, and a pair of lateral links are arranged at the front and rear of the vehicle body, and the front end extends approximately in the longitudinal direction of the vehicle body, and the front end is swingably attached to the front or rear of the vehicle body. In an independent suspension system for a vehicle, the radius slot has a rear end connected to a wheel support part or the outside of the lateral link on the front side of the vehicle body, and the front end side of the radius slot and the inside end side of the lateral link on the front side of the vehicle body are connected to each other. An auxiliary link is provided for connection, and the axis of the elastic bush that attaches the inner end of the lateral link on the front side of the car body to the car body is tilted with respect to the longitudinal direction of the car body so that the rear side of the car body faces inward. Even with the applied braking force, the wheels can be tilted toward the toe-in side. Therefore, there is an effect that the steering stability of the vehicle can be improved during braking while the vehicle is turning.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a conventional independent suspension system for a vehicle, FIG. 2 is a side view of the conventional independent suspension system seen from the rear side of the vehicle body, and FIG. 3 is a plan view showing a conventional vehicle independent suspension system. Plan view showing independent suspension system, 4th
The figure shows an independent suspension system for a vehicle according to another embodiment of the invention. 21...Independent suspension system, 22...Strut (guide member), 23...Radius slot, 24,2
5... Lateral link, 26... Left rear wheel, 27
...Wheel support part, 28...Spindle, 29,3
0, 31, 32, 33, 35...Cylindrical member, 34
...Auxiliary link.

Claims (1)

[Claims] 1. A guide member whose one end is swingably attached to the vehicle body and whose other end is connected to a wheel support part that rotatably supports the wheel, and which extends substantially laterally to the vehicle body and whose inner end swings to the vehicle body via an elastic bushing. a pair of lateral links arranged in the front and rear of the vehicle body, the outer ends of which are swingably attached to the front or rear of the wheel support portion; and a radius slot whose rear end is connected to the outside of the vehicle body of the wheel support portion or the lateral link on the front side of the vehicle body, the front end side of the radius slot and the lateral link on the front side of the vehicle body. An auxiliary link is provided to connect the inner end of the lateral link on the front side of the vehicle body, and the axial direction of the elastic bush that attaches the inner end of the lateral link on the front side of the vehicle body to the vehicle body is oriented in the longitudinal direction of the vehicle body so that the rear side of the vehicle body faces inward. An independent suspension system for a vehicle characterized by its tilting.