JPH0995113A - Automotive suspension - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of the whole of a suspension, and reduce cost by connecting a hub carrier and a car body by a lower arm, an upper arm, and a radius arm. SOLUTION: A hub carrier 14 is supported so that it can freely move in the vertical direction relative to a car body 16 through the first, second, and third bushes 34, 38, and 42 on the hub carrier side, which are provided on a lower arm 26, an upper arm 28, and a radius arm 30. Therefore, when a vertical load is applied to a wheel 12, the hub carrier 14 is moved vertically to expand and contract a damper 56 and a coil spring 54. Thus, the vertical load is damped by the damper 56 and the coil spring 54 to improve riding comfort.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension system for an automobile for swingably connecting a hub carrier that rotatably supports wheels to a vehicle body.

[0002]

2. Description of the Related Art For example, in a vehicle such as an automobile, a suspension device for swingably connecting a wheel and a vehicle body is adopted in order to absorb a change in road surface condition and obtain a comfortable riding comfort. This suspension system has a function of smoothly absorbing a shock from the road surface and reducing the vibration of the vehicle body. For example, a double wishbone type suspension has been widely known.

A double wishbone type suspension of this type, as shown in FIG.
Attach the hub carrier 3 with the trailing arm 4,
A lower arm 5a, 5b and an upper arm 6 are connected to a vehicle body (not shown), and a damper 7 for absorbing a vertical load acting on the tire 1 is provided.

[0004]

By the way, in the above-mentioned prior art, four pivots are provided for mounting the trailing arm 4, the lower arms 5a, 5b and the upper arm 6 on the vehicle body side. For this reason, it has been pointed out that the number of pivots increases and the cost of the entire suspension increases and the weight increases.

Further, the pivot bush 8 provided at the tip of the trailing arm 4 has an axis extending in the vehicle width direction (arrow A direction). Therefore, the compliance effect of allowing the tire 1 to escape rearward in order to absorb the impact when riding over the protrusions on the road surface cannot be obtained sufficiently. As a result, there is a problem that the riding comfort is not good.

At this time, it is possible to soften the pivot bush 8 and the like in order to obtain a desired compliance effect, but there is a problem that the tire 1 tends to toe out.

The present invention solves this kind of problem, and effectively reduces the number of pivots on the vehicle body side to reduce the weight and cost, and to obtain a comfortable riding comfort. The purpose is to provide a suspension system for an automobile.

[0008]

In order to solve the above-mentioned problems, the present invention provides a hub carrier and a vehicle body with a lower arm,
Since they are connected by the upper arm and the radius arm, the number of pivots on the vehicle body side is three, and the weight and cost of the entire suspension system can be reduced. Further, since the vehicle body side mounting portion of the radius arm is slidable in the vehicle length direction, an effective compliance effect can be obtained. Moreover, the lower arm and the upper arm are arranged such that their vehicle-body-side mounting portions are inclined rearward in the traveling direction from the hub-carrier-side mounting portions toward the inside of the vehicle body in the vehicle width direction. As a result, even if a longitudinal force acts on the wheel, the wheel can be reliably maintained in the toe-in state.

[0009]

1 is a perspective view of a vehicle suspension system 10 according to an embodiment of the present invention. The suspension device 10 pivotally connects a hub carrier 14 that rotatably supports a wheel 12 and a vehicle body 16. The wheel 12 includes a tire 18 and a wheel portion 20. As shown in FIGS. 2 to 4, the wheel portion 20 is rotatably attached to the outer periphery of the spindle 24 via a wheel bearing 22, and The spindle 24 is fixed to the hub carrier 14.

The suspension system 10 includes a lower arm 26, an upper arm 28 and a radius arm 30. At both ends of the lower arm 26, a vehicle body side first bush (mounting portion) 32 connected to the vehicle body 16 and a hub carrier side first bush (mounting portion) 34 connected to the hub carrier 14 are provided.

As shown in FIG. 2, the first bush 3 on the vehicle body side.
2 is arranged inclining rearward from the hub carrier side first bush 34 toward the inside of the vehicle body 16 in the vehicle width direction (direction of arrow H) in the traveling direction (direction of arrow L). Is disposed below the center of rotation of the (see FIGS. 3 and 4).

A vehicle body side second bush (mounting portion) 36 connected to the vehicle body 16 and a hub carrier side second bush (mounting portion) 38 connected to the hub carrier 14 are provided at both ends of the upper arm 28. . The vehicle-body-side second bush 36 includes a hub carrier-side second bush (mounting portion) 38.
The vehicle body 16 is disposed inwardly in the vehicle width direction and is inclined rearward in the traveling direction (see FIG. 2), and the upper arm 28 is disposed above the rotation center of the wheel 12 (FIGS. 3 and 4). reference).

At both ends of the radius arm 30, the body 16
A vehicle body side third side bush (mounting portion) 40 connected to
A hub carrier side third bush (mounting portion) 42 connected to the hub carrier 14 is provided, and the vehicle body side third bush 40 is located inward of the vehicle carrier 16 from the hub carrier side third bush 42. It is arranged to be inclined forward in the traveling direction (see FIG. 2).

As shown in FIGS. 2 and 3, the vehicle-body-side third bush 40 has a cylindrical shape which is relatively long in the vehicle length direction (direction of arrow L), and both ends of the third bush 40 are radius arms 3.
The length S is projected from the one end portion 30a of 0 to the outside. A first shaft 44 is inserted into the vehicle-body-side third bush 40. The first shaft 44 and the vehicle-body-side third bush 40 are integrally fixed via a pin 46, and Both ends of the shaft 44 are locked to mounting members 48 provided on the vehicle body 16 side.

The hub carrier side third bush 42 has a cylindrical shape which is relatively long in the vehicle length direction (direction of arrow L), and is inserted into the other end 30b of the radius arm 30. The second shaft 50 is inserted into the hub carrier side third bush 42, and the hub carrier side third bush 42 and the second shaft 50 are integrally fixed via a pin 52. The other end 30b of the radius arm 30 is rotatably arranged so as to fit into the hub carrier 14, and cannot move in the vehicle length direction (direction of arrow L) with respect to the hub carrier 14.

A damper 56 having a coil spring 54 attached thereto is mounted on the hub carrier 14.

The operation of the suspension device 10 thus constructed will be described below.

First, the hub carrier 14 includes the lower arm 2
6, the upper arm 28 and the radius arm 30 are movably supported in the vertical direction with respect to the vehicle body 16 via hub carrier side first to third bushes 34, 38 and 42. Therefore, when a vertical load is applied to the wheel 12, the hub carrier 14 moves in the vertical direction to expand and contract the damper 56 and the coil spring 54. As a result, the vertical load is damped by the damper 56 and the coil spring 54, and riding comfort is improved.

Further, one end 30 of the radius arm 30
The vehicle-body-side third bush 40 attached to a is rotatable with respect to the vehicle body 16 and extends in the vehicle length direction (via the gap (corresponding to the length S)) between the mounting member 48 and the one end 30a (in the vehicle length direction). It is slidable in the direction of arrow L) (see FIG. 2). Therefore, for example, when the wheel 12 rides on a protrusion on the road surface,
The vehicle-body-side third bush 40 moves in the front-rear direction. As a result, the load acting on the wheels 12 in the front-rear direction can be reliably absorbed, a sufficient compliance effect can be obtained, and the ride comfort is further improved.

Furthermore, the hub carrier side third bush 42 mounted on the other end 30b of the radius arm 30.
The other end portion 30b engages with the hub carrier 14 without any gap so that it can rotate only. Therefore, when the wheel 12 moves up and down, the hub carrier side third bush 42 rotates together with the second shaft 50 with respect to the hub carrier 14, and the wheel 12 can be moved up and down smoothly. . On the other hand, when the wheels 12 receive the brake torque, this brake torque is directly applied to the radius arm 3
0 is transmitted to the vehicle body 1 via the vehicle body side third bush 40.
It will be possible for the 6 side to reliably receive it.

In the lower arm 26 and the upper arm 28, the vehicle-body-side first and second bushes 3 are respectively provided.
2, 36 are the first and second bushes 3 on the hub carrier side.
It is arranged so as to incline rearward in the traveling direction from 4, 38 inward in the vehicle width direction (arrow H direction) (see FIG. 2). Therefore, when a front-back load is applied to the wheel 12, the lower arm 26 and the upper arm 28 have an effect that the wheel 12 can always be held in the toe-in direction.

In this embodiment, the suspension device 10 includes the lower arm 26, the upper arm 28, and the radius arm 30, and the number of mounting portions (pivots) on the vehicle body 16 side is the first to third bushes 32, 36 and 40 on the vehicle body side. It is reduced to 3 points. As a result, the number of pivots is reduced as compared with the conventional four-point pivot of the double wishbone suspension, and it is possible to easily reduce the weight of the suspension device 10 as a whole and reduce the manufacturing cost.

[0023]

As described above, in the vehicle suspension system according to the present invention, since the hub carrier and the vehicle body are connected by the lower arm, the upper arm and the radius arm,
Since the number of pivots on the vehicle body side is three, weight reduction and cost reduction of the entire suspension system can be easily performed. Further, the vehicle body side mounting portion of the radius arm is slidable in the vehicle length direction, and an effective compliance effect can be obtained.

Moreover, the vehicle-body-side mounting portions of the lower arm and the upper arm are disposed so as to be inclined rearward in the traveling direction from the hub-carrier-side mounting portion toward the inside of the vehicle body in the vehicle width direction. This makes it possible to reliably maintain the wheel in the toe-in state even if the longitudinal force acts on the wheel.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a suspension device according to the present invention.

FIG. 2 is a partial cross-sectional plan view of the suspension device.

FIG. 3 is a side view of the suspension device.

FIG. 4 is a partial cross-sectional rear view of the suspension device.

FIG. 5 is a perspective explanatory view of a double wishbone suspension according to the related art.

[Explanation of symbols]

10 ... Suspension device 12 ... Wheels 14 ... Hub carrier 16 ... Car body 26 ... Lower arm 28 ... Upper arm 30 ... Radius arm 32, 34, 36, 38, 40, 42 ... Bush 56 ... Damper

Claims (1)

[Claims] 1. A suspension system for an automobile, in which a hub carrier that rotatably supports wheels and a vehicle body are swingably connected to each other, wherein a vehicle body side mounting portion is inside the vehicle width direction of the vehicle body from the hub carrier side mounting portion. The lower arm, which is inclined rearward in the traveling direction toward the vehicle, and is arranged below the center of rotation of the wheel, and the vehicle body side mounting portion is directed inward in the vehicle width direction of the vehicle body from the hub carrier side mounting portion. And the upper arm, which is inclined rearward in the traveling direction and is arranged above the center of rotation of the wheel, and the vehicle body side mounting portion travels inward in the vehicle width direction of the vehicle body from the hub carrier side mounting portion. A radius arm that is inclined forward in the direction of the vehicle, and a vehicle body side mounting portion of the radius arm is configured to be rotatable with respect to the vehicle body and slidable in a vehicle length direction. Hub carrier side attachment portion of the Asuamu the automotive suspension system, characterized in that it is configured to be only rotate relative to the hub carrier.