Double wishbone suspension

Details Double wishbone suspension Double wishbone suspension

2000-09-05

2001-10-16

Culbreth, Eric (Department: 3611)

Land vehicles

Wheeled

Running gear

C280S124125, C280S124135, C280S124143

Reexamination Certificate

active

06302420

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a suspension for a vehicle, especially a double wishbone suspension.
BACKGROUND OF THE INVENTION
One example of a double wishbone suspension for a vehicle is shown in Japanese Laid-Open Patent Application No. 6-344737. A suspension for a vehicle comprises a carrier, an upper-arm, a lower arm, a lateral link, and a connecting part. The carrier supports a wheel of the vehicle so that the wheel can rotate on an axis of the wheel. The upper-arm is provided in the transverse direction of the vehicle. An inside end of the upper-arm is coupled to a frame of the vehicle, and an outside end of the upper-arm is coupled to an upper end of the carrier, so that the upper-arm can vertically oscillate. The lower-arm is coupled to the frame of the vehicle on two inside ends of the lower-arm, and the two inside ends are separated in the front-rear direction of the vehicle, so that the lower-arm can vertically oscillate. The lateral link (also called toe control rod) is coupled to the frame of the vehicle on an inside end of the lateral link and coupled to the carrier at a point offset from the axis of the wheel in the front-rear direction of the vehicle. A connecting part is between the carrier and the lower-arm so that the carrier can move in the front-rear direction of the vehicle relative to the upper-arm and the lower-arm.
It is advantageous that a good rigidity supporting the wheel can be obtained by the above-mentioned double wishbone suspension. Furthermore, the suspension can be adopted to the vehicle having a four-wheel-steering mechanism without any modification.
However, the connecting part comprises an inner pipe and an outer pipe. The inner pipe is coupled to the lower arm via an intermediate shaft and a supporting shaft on an end of the inner pipe, so that the inner pipe can oscillate in the transverse direction of the vehicle. The outer pipe is connected to the inner pipe on one side, so that the outer pipe can reciprocate in the direction of an axis of the inner and outer pipes. That is, the inner pipe is telescopic to the outer pipe. The outer pipe is coupled to the carrier on the other side by way of a ball joint. As mentioned above, a structure of the connecting part is complicated. Then, a cost of the suspension is rather high, and it is desirable that a reliability of the suspension is improved.
SUMMARY OF THE INVENTION
It is thus one object of the present invention to solve the aforementioned problems. That is, the object of the invention is to provide a double wishbone suspension for a vehicle.
A double wishbone suspension comprises a carrier, an upper-arm, a lower-arm, a lateral link, and a connecting part. The carrier supports a wheel of a vehicle, so that the wheel can rotate on an axis. An inside end of the upper-arm is coupled to a frame of the vehicle, and an outside end of the upper-arm is coupled to an upper end of the carrier, so that the upper-arm can vertically oscillate. Two separated inside ends of the lower-arm are coupled to the frame of the vehicle, and an outside end of the lower-arm is coupled to a lower end of the carrier. The two inside ends are separated in the front-rear direction of the vehicle. The lower-arm can vertically oscillate. An inside end of the lateral link is coupled to the frame of the vehicle, and an outside end of the lateral link is coupled to the carrier at a point offset from the axis of the wheel in the front-rear direction of the vehicle. The lateral link can vertically oscillate. A connecting part is between the carrier and the lower-arm so that the carrier can move in the front-rear direction of the vehicle relative to the lower-arm. The connecting part comprises two rigid parts and a rubber bush which is between the two rigid parts. The rubber bush is elastically deformable. The two rigid parts are inner and outer cylinders.
By this double wishbone suspension, the position of the inside end of the lateral link is maintained constant, and the lower-arm, the connecting part, and the lateral link collaborate to get a good rigidity for supporting the wheel, same as a known H-shaped lower-arm.
The structure of the suspension is simple because the connecting part consists of the two rigid parts and the rubber bush. Consequently, a cost of the suspension is low, and a reliability of the suspension is high.


REFERENCES:
patent: 4822073 (1989-04-01), Tanahashi et al.
patent: 4828279 (1989-05-01), Matschinsky
patent: 5380024 (1995-01-01), Hayami
patent: 6099005 (2000-08-01), Wakatsuki
patent: 06344737A (1994-12-01), None

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