JP2000118220A - Independent suspension device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve both riding comfort and maneuvering stability by connecting the rear end part of a trailing arm to a rear axle, connecting the front end part to the car body side through a rubber bush, and providing a backward inclination for the center line of spaces formed in this rubber bush. SOLUTION: In this device, the front end part 1' of a trailing arm is connected to a car body side support shaft 3 through a rubber bush 10. A pair of spaces 11, 11 is formed in the rubber bush 10 with the car body side support shaft 3 as the center. Since the center line A has an angle (a backward inclination) θ between the center line and the vehicle longitudinal direction by extending backward and downward from the front upper part of a vehicle, the rubber bush 10 is particularly large is resiliency in the direction of the backward inclination θ. This backward inclination θ is desirably in a range of about 30±5 deg.. Thus, since road surface input in the vicinity of the backward inclination θ to the trailing arm is excellently damped by the rubber bush 10, riding comfort can be greatly improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailing arm type independent suspension system for a vehicle.

[0002]

2. Description of the Related Art In a conventional trailing arm type independent suspension system for a vehicle, as shown in FIGS. 3 and 4, a front end 1 'of a trailing arm 1 is supported on a vehicle body via a rubber bush 2. As shown in FIG. While being connected to the shaft 3, a rear axle 4 such as a knuckle fixed to the rear end of the trailing arm 1 is connected to the vehicle body by an upper arm 5, a lower arm 6, and a suspension strut 7. A pair of cavities 8, 8 are formed in the front-rear direction, and a soft spring constant is obtained in the vehicle front-rear direction, thereby improving the riding comfort of the vehicle. However, since the longitudinal stiffness of the independent suspension is weakened by the formation of the cavities 8 in the rubber bush 2, it is disadvantageous in terms of steering stability, and it is difficult to improve both ride comfort and steering stability. Met.

[0003] As shown in Japanese Patent Application Laid-Open No. 62-26107, in a trailing arm type rigid axle suspension, a pair of cavities are formed in a bush provided on a vehicle body side support portion of the trailing arm. There is a technology that corrects the roll steer of the suspension by changing the directionality of the elasticity of the bush by rotating the bush according to the turning direction of the vehicle. It is a special suspension which is limited in its object and is free from an independent suspension, and changes the directionality of the elasticity of the bush according to the turning direction of the vehicle.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to improve both ride comfort and steering stability in a trailing arm type independent suspension for a vehicle.

[0005]

Therefore, in the independent suspension according to the present invention, the rear end of the trailing arm is connected to the rear axle, and the front end of the trailing arm is connected to the vehicle body via a rubber bush. The center line of the void formed in the rubber bush has a rearward inclination angle.

Accordingly, since the rubber bush has a particularly large elasticity in the direction of the rearward inclination angle of the center line of the space, that is, from the upper front to the lower rear of the vehicle, the front and upper and lower rear of the vehicle are added when the vehicle is running. Input to the vehicle can be satisfactorily buffered, and the ride comfort can be improved, and the spring characteristics in the vehicle front-rear direction are enhanced as compared with the conventional device in which a space is formed in the vehicle front-rear direction. Steering stability can be improved by reducing a change in steering of the wheel with respect to an input in the vehicle front-rear direction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described by assigning the same reference numerals to the same parts as those of the conventional apparatus. 1 and 2, a trailing arm type independent suspension device for a vehicle has a front end 1 'of a trailing arm 1 connected to a vehicle body-side support shaft 3 via a rubber bush 10, while the trailing arm 1 A rear axle 4 such as a knuckle fixed to the rear end of the vehicle is connected to the vehicle body by an upper arm 5, a lower arm 6, and a suspension strut 7.

A pair of cavities 11, 11 are formed in the rubber bush 10 with the vehicle-body-side support shaft 3 as a center.
The center line A extends from the upper front to the lower rear of the vehicle and has an angle θ (referred to as a rearward tilt angle) with the front-rear direction of the vehicle, so that the rubber bush 10 is particularly elastic in the direction of the rearward tilt angle θ. Sex is growing.

On the other hand, as in the case where the vehicle travels on a rough road surface, the direction of the road surface input received by the trailing arm 1 when the vehicle climbs over the protrusion is the direction in which the vehicle longitudinal direction and the vertical vibration are combined. Therefore, the vertical component increases as the vehicle speed increases. For example, when the vehicle speed is 20 km / h
At the time of the road surface input is approximately 20 °, and when the vehicle speed is 40 km / h, the rear inclination angle θ of the road surface input is approximately 30 °.
When the vehicle speed is 60 km / h, the rear inclination angle θ of the road surface input is about 40 ° to 45 °, and the vehicle speed is 80 km / h.
In this case, the rear inclination angle θ of the road surface input is about 60 ° to 90 °.

Therefore, in consideration of the practical vehicle speed, it is preferable that the rearward inclination angle θ of the vacant space center line A be set in the range of 20 ° to 45 °. In particular, the rearward inclination angle θ is set to about 30 ± 5 °. It is preferable to select within the range.

As described above, the rubber bush 10 has a particularly elasticity in the backward inclination angle θ direction of the void center line A due to the voids 11 formed in the rubber bush 10, so that the trailing arm Since the road surface input near the rearward inclination angle θ with respect to 1 is well buffered by the rubber bush 10, the ride comfort can be greatly improved as compared with the conventional device.

In the rubber bush 10, a void 1
The center line A of 1 and 11 has the backward inclination angle θ, and the backward inclination angle θ
Rubber bush 1
0 indicates that the rigidity in the vehicle front-rear direction is high, so that deformation of the rubber bush 10 due to input in the vehicle front-rear direction acting on the trailing arm 1 during acceleration / deceleration or turning of the vehicle is suppressed. In addition, the change in the steering of the wheel is reduced, and the change in the toe angle and the tread is reduced, so that the steering stability of the vehicle can be improved accordingly.

Further, high-frequency input such as road noise received from the road surface when the vehicle is running at high speed acts mainly in the vertical direction, but the center line A of the cavity has a rearward inclination angle θ, and the rubber bush 10 Since the elasticity in the vertical direction is greater than that in the case of (1), this high-frequency input can be easily buffered, and the riding comfort can be improved from this aspect as well.

The above embodiment is a so-called full trailing arm type independent suspension device, but a so-called semi-trailing arm type independent suspension in which the vehicle body side support shaft 3 of the trailing arm 1 is inclined in the vehicle width direction. Also in the device, it is needless to say that the same operation and effect as in the above-described embodiment can be obtained by adopting the rubber bush with the same configuration as in the above-described embodiment.

[0015]

According to the independent suspension system of the present invention, the input to the front upper and lower rear portions of the vehicle, which is applied when the vehicle is running, can be favorably buffered to improve the riding comfort. In addition, since the spring characteristics in the vehicle longitudinal direction are relatively high, there is an advantage that the steering change of the wheel with respect to the input in the vehicle longitudinal direction can be reduced and the steering stability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of the embodiment.

FIG. 3 is a schematic perspective view of a conventional device.

FIG. 4 is an enlarged side view of a main part of the conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trailing arm 3 Car body side support shaft 4 Rear axle 10 Rubber bush 11 Empty space θ Back tilt angle

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Oi 5-33-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Inventor Kazuo Fukuyama 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Inside the Automotive Industry Co., Ltd. (72) Inventor Yuzo Niina 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation F-term (reference) 3D001 AA02 AA12 AA19 BA42 DA08

Claims (1)

[Claims] 1. A trailing arm has a rear end connected to a rear axle, a front end of the trailing arm connected to a vehicle body via a rubber bush, and a center line of a void formed in the rubber bush. An independent suspension having a rearward inclination angle.