JP3667832B2 - Car suspension system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suspension system for an automobile in which a hub carrier that rotatably supports a wheel and a vehicle body are connected so as to be swingable.
[0002]
[Prior art]
For example, in a vehicle such as an automobile, a suspension device that swingably connects a wheel and a vehicle body is employed in order to obtain a comfortable riding comfort by absorbing changes in road surface conditions. This suspension device has a function of smoothly absorbing a shock from the road surface and reducing the shaking of the vehicle body. For example, a double wishbone suspension has been widely known.
[0003]
In this type of double wishbone suspension, as shown in FIG. 5, a hub carrier 3 on which a wheel 2 of a tire 1 is mounted is mounted on a vehicle body (not shown) by a trailing arm 4, lower arms 5a, 5b and an upper arm 6. A damper 7 for absorbing the vertical load acting on the tire 1 is provided while being configured to be coupled.
[0004]
[Problems to be solved by the invention]
By the way, in the above prior art, four pivots are provided to attach the trailing arm 4, the lower arms 5a, 5b and the upper arm 6 to the vehicle body side. For this reason, the number of pivots increases, and the problem that the cost of the whole suspension increases and the weight increases is pointed out.
[0005]
Further, the pivot bush 8 provided at the tip of the trailing arm 4 has an axis that extends in the vehicle width direction (arrow A direction). Therefore, the compliance effect of letting the tire 1 escape backward cannot be obtained in order to absorb the impact when getting over the bumps on the road surface. As a result, there is a problem that the ride comfort is not good.
[0006]
At that time, in order to obtain a desired compliance effect, it is conceivable to soften the pivot bush 8 or the like, but there is a problem that the tire 1 tends to be toe-out.
[0007]
The present invention solves this type of problem, and can effectively reduce the number of pivots on the vehicle body side to reduce the weight and cost, and can provide a comfortable suspension for automobiles. An object is to provide an apparatus.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention is configured such that the hub carrier and the vehicle body are connected by the lower arm, the upper arm, and the radius arm, so that the number of pivots on this vehicle body side is three points, and the weight of the entire suspension device and the cost are reduced. Reduction is planned. Furthermore, 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. In addition, the lower arm and the upper arm are arranged such that the respective vehicle body side attachment portions are inclined rearward in the traveling direction from the hub carrier side attachment portion toward the vehicle width direction inward of the vehicle body. Thereby, even if a longitudinal force acts on the wheel, the wheel can be reliably maintained in the toe-in state.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective explanatory view of an automobile suspension device 10 according to an embodiment of the present invention. The suspension device 10 is configured to connect a hub carrier 14 that rotatably supports a wheel 12 and a vehicle body 16 in a swingable manner. The wheel 12 includes a tire 18 and a wheel portion 20, and 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. The spindle 24 is fixed to the hub carrier 14.
[0010]
The suspension device 10 includes a lower arm 26, an upper arm 28, and a radius arm 30. A vehicle body side first bush (attachment portion) 32 connected to the vehicle body 16 and a hub carrier side first bush (attachment portion) 34 connected to the hub carrier 14 are provided at both ends of the lower arm 26.
[0011]
As shown in FIG. 2, the vehicle body side first bush 32 is inclined rearward in the traveling direction (arrow L direction) from the hub carrier side first bush 34 toward the inside of the vehicle body 16 in the vehicle width direction (arrow H direction). The lower arm 26 is disposed below the center of rotation of the wheel 12 (see FIGS. 3 and 4).
[0012]
A vehicle body side second bush (attachment portion) 36 connected to the vehicle body 16 and a hub carrier side second bush (attachment 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 is disposed to be inclined rearward in the traveling direction from the hub carrier side second bush (attachment portion) 38 toward the vehicle width direction inward of the vehicle body 16 (see FIG. 2), and the upper arm. 28 is arrange | positioned above the rotation center of the wheel 12 (refer FIG. 3 and FIG. 4).
[0013]
At both ends of the radius arm 30, a vehicle body side third bush (attachment portion) 40 connected to the vehicle body 16 and a hub carrier side third bush (attachment portion) 42 connected to the hub carrier 14 are provided. The vehicle body side third bush 40 is disposed so as to incline forward in the traveling direction from the hub carrier side third bush 42 toward the vehicle width direction inward of the vehicle body 16 (see FIG. 2).
[0014]
As shown in FIGS. 2 and 3, the vehicle body side third bush 40 has a relatively long cylindrical shape in the vehicle length direction (arrow L direction), and both end portions thereof are one end portions 30 a of the radius arm 30. Each projecting to the outside by a length S. A first shaft 44 is inserted into the vehicle body side third bush 40, and the first shaft 44 and the vehicle body side third bush 40 are integrally fixed via a pin 46, and the first shaft 44. Both ends of the shaft 44 are locked to mounting members 48 provided on the vehicle body 16 side.
[0015]
The hub carrier side third bush 42 has a relatively long cylindrical shape in the vehicle length direction (arrow L direction), and is inserted into the other end 30 b 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 portion 30 b of the radius arm 30 is disposed so as to be able to rotate only so as to fit into the hub carrier 14, and cannot move in the vehicle length direction (arrow L direction) with respect to the hub carrier 14.
[0016]
A damper 56 with a coil spring 54 is attached to the hub carrier 14.
[0017]
The operation of the suspension device 10 configured as described above will be described below.
[0018]
First, the hub carrier 14 is supported so as to be movable in the vertical direction with respect to the vehicle body 16 via hub carrier side first to third bushes 34, 38 and 42 provided on the lower arm 26, the upper arm 28 and the radius arm 30. . For this reason, when a vertical load is applied to the wheel 12, the hub carrier 14 moves in the vertical direction, causing the damper 56 and the coil spring 54 to expand and contract. Thereby, the up-and-down load is attenuated by the damper 56 and the coil spring 54, and riding comfort is improved.
[0019]
Furthermore, the vehicle body side third bush 40 mounted on the one end portion 30a of the radius arm 30 is rotatable with respect to the vehicle body 16, and a gap (corresponding to the length S) between the mounting member 48 and the one end portion 30a. Is slidable in the vehicle length direction (arrow L direction) via (see FIG. 2). Therefore, for example, when the wheel 12 rides on a road surface protrusion or the like, the vehicle body side third bush 40 moves in the front-rear direction. As a result, the load in the front-rear direction acting on the wheel 12 can be reliably absorbed, and a sufficient compliance effect can be obtained, so that the ride comfort can be further improved.
[0020]
Furthermore, the hub carrier side third bush 42 attached to the other end 30b of the radius arm 30 is configured to be rotatable only when the other end 30b is engaged with the hub carrier 14 without a gap. For this reason, when the wheel 12 moves up and down, the hub carrier side third bush 42 rotates integrally 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 wheel 12 receives the brake torque, the brake torque is directly transmitted to the radius arm 30 and can be reliably received on the vehicle body 16 side via the vehicle body side third bush 40.
[0021]
In the lower arm 26 and the upper arm 28, the first and second bushes 32 and 36 on the vehicle body side are directed inward in the vehicle width direction (arrow H direction) from the first and second bushes 34 and 38 on the hub carrier side. It is inclined and disposed rearward in the traveling direction (see FIG. 2). Therefore, when a longitudinal 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.
[0022]
In the present embodiment, the suspension device 10 includes a lower arm 26, an upper arm 28, and a radius arm 30, and the number of attachment portions (pivots) on the vehicle body 16 side is three points of the vehicle body side first to third bushes 32, 36, and 40. Reduced to As a result, the number of pivots is reduced as compared with the four-point pivot of the conventional double wishbone suspension, and the overall weight of the suspension device 10 and the manufacturing cost can be easily reduced.
[0023]
【The invention's effect】
As described above, in the automobile suspension system according to the present invention, the hub carrier and the vehicle body are connected by the lower arm, the upper arm, and the radius arm, so the number of pivots on the vehicle body side becomes three points, and the weight of the entire suspension device is reduced. Cost reduction is easily accomplished. Furthermore, 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.
[0024]
In addition, the vehicle body side mounting portions of the lower arm and the upper arm are disposed to be inclined rearward in the traveling direction from the hub carrier side mounting portion toward the vehicle width direction inward of the vehicle body. As a result, even if a longitudinal force acts on the wheel, the wheel can be reliably maintained in the toe-in state.
[Brief description of the 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 an explanatory perspective view of a double wishbone suspension according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Suspension apparatus 12 ... Wheel 14 ... Hub carrier 16 ... Vehicle body 26 ... Lower arm 28 ... Upper arm 30 ... Radius arm 32, 34, 36, 38, 40, 42 ... Bush 56 ... Damper

Claims (1)

A suspension system for an automobile that slidably connects a vehicle body and a hub carrier that rotatably supports a wheel,
A lower arm that is disposed with the vehicle body side attachment portion inclined from the hub carrier side attachment portion inward in the vehicle width direction of the vehicle body in the traveling direction and disposed below the rotation center of the wheel;
An upper arm, the vehicle body side mounting portion is disposed to be inclined rearward in the traveling direction from the hub carrier side mounting portion toward the vehicle width direction inward of the vehicle body, and is disposed above the rotation center of the wheel;
A radius arm arranged so that the vehicle body side mounting portion is inclined forward in the traveling direction from the hub carrier side mounting portion toward the vehicle width direction inward of the vehicle body;
With
The vehicle body side mounting portion of the radius arm is inserted into the tubular portion, and is inserted into the tubular portion extending in the vehicle length direction of the vehicle body so as to intersect the extending direction of the radius arm. A bushing that is rotatable about its axis and slidable in the vehicle length direction, and a shaft member that is inserted through the bushing and locked to the vehicle body side ,
A suspension device for an automobile, wherein the hub carrier side mounting portion of the radius arm is configured to be rotatable only with respect to the hub carrier.

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