JPH0361103A - Suspension device for vehicle - Google Patents

Abstract

PURPOSE:To rationalize a change of camber and to prevent interference among respective constitutional elements at the time of bump rebounding by arranging a lower link side supporting point of a buffer device either on or above a horizontal plane passing a frame side rocking center of the lower link. CONSTITUTION:A suspension device A is arranged in the direction of the width of a vehicle, and has at least a first lower arm 19 whose both ends are rotatably connected to a lower end of a wheel support 8 and a lower surface of a cross member 9. Between the first lower arm 19 and a vehicle frame B, a shock absorber 22 is arranged as a buffer device. In this constitution, a lower link side supporting point 23L of the shock absorber 23 is arranged either on or above a horizontal surface HOR which passes through a frame side rocking center 19A of the first lower arm 19. For example, the above-mentioned supporting point 23L is arranged on an upwards projected portion 19a formed at a required portion of the first lower arm 19.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vehicle suspension device such as a double wishbone suspension device in which a wheel is supported vertically swingably by an upper link and a lower link. Regarding.

(Prior Art) Conventionally, as a suspension device for a vehicle of the above-mentioned example, there is, for example, a device described in Japanese Utility Model Publication No. 1.762/1982.

In other words, in order to eliminate brake shudder and improve ride comfort, the knuckle arm, which serves as a wheel support member, is extended above the wheel rim, and an upper link is installed between this extension and the vehicle body, and a cross section is installed between the lower part of the knuckle arm and the cross section. A high mount double wish that has a lower link installed between each member and the vehicle body to support the wheels so that they can swing up and down, and a shock absorber installed between the lower link and a part of the suspension tower of the vehicle body. It is a bone type suspension device.

In this conventional device, by extending the knuckle arm upward, the distance between the upper arm attachment point and the wheel rotation axis is increased.
Since the distance can be increased and play judder can be prevented with a small force, the elastic bushing provided at the support point on the vehicle body side of the upper arm can be made softer, which has the advantage of improving riding comfort, but on the other hand, it has the following problems: was there.

In other words, since the above-mentioned upper arm needs to be installed in a relatively narrow space above the rim on the inside of the wheel, its length is restricted and the length of the upper arm is shortened, resulting in camber loss during bumps and rebounds. There was a problem with large changes.

In addition, the lower link side support point of the above-mentioned shock absorber is set at a lower position with respect to the horizontal plane passing through the vehicle body side rocking fulcrum of the above-mentioned lower link. Since it is displaced outward and then displaced inward into the vehicle body, there is a problem in that the shock absorber and the wheels, specifically the coil spring and the extension of the knuckle arm, are affected by the shock.

(Object of the Invention) The present invention provides a suspension system for a vehicle that is capable of optimizing camber changes during bumps and rebounds, and reliably preventing interference between a shock absorber and wheels and wheel support members during bumps. For the purpose of providing.

(Structure of the Invention) This invention supports a wheel by an upper link and a lower link so as to be able to swing up and down, and also provides an upper link and a lower upper link which are arranged at a predetermined interval in the vertical direction. The suspension device for a vehicle comprises a link, the upper upper link is arranged in the longitudinal direction of the vehicle body, the lower upper link is arranged in the lateral direction of the vehicle body, and a shock absorber is provided between the lower link and the vehicle body. The suspension device for a vehicle is characterized in that the lower link side support point of the shock absorber is set on a horizontal plane passing through the vehicle body side rocking fulcrum of the lower link or at a position above the horizontal plane.

(Effects of the Invention) According to the present invention, the above-mentioned upper link is constituted by an upper arapa link and a lower upper link disposed at a predetermined interval in the downward direction, and the above-mentioned upper upper link is arranged in the vehicle body longitudinal direction. In addition, since the lower upper links are arranged in the lateral direction of the vehicle body, the displacement of the wheel support member in the vehicle width direction can be restricted by the lower upper links extending in the vehicle width direction, so that the displacement of the wheel support member in the vehicle width direction can be restricted. This has the effect of keeping camber changes appropriate.

Moreover, since the lower link side support point of the above-mentioned shock absorber is set at a position above the above-mentioned horizontal plane, the above-mentioned shock absorber can move the lower link towards the vehicle body side swing fulcrum as the lower link swings upward during a bump. The vehicle is displaced inward from the start of the bump along a virtual arc trajectory centered at .

As a result, it is possible to reliably prevent interference between the shock absorber, the wheel, and the wheel support member during a bump.

(Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawings show a double wishbone suspension system for a vehicle, and in FIGS. 1 and 2, a wheel 1 has a disc plate 4 and a wheel disc 5 integrally attached to a wheel hub 2 using bolts and nuts 3. At the same time, a tire 7 is attached to a rim 6 on the outer periphery of the wheel disc 5.

Note that the drawing shows the front right wheel 1.

A wheel support 8 is provided as a wheel support member that rotatably supports the wheel 1 described above, and this wheel support 8
An extension portion 8a is formed along the inside of the wheel 1 and extends above the uppermost end of the rim 6 of the wheel 1.

The above-mentioned wheels 1 and wheel supports 8 are supported via a suspension device A by a vehicle body B and a cross member 9 extending in the vehicle width direction so as to be vertically swingable.

The above-mentioned suspension device A is arranged in the longitudinal direction of the vehicle body, and the wheel side support point is pivotally connected to the end of the extension portion 8aJ of the above-mentioned wheel support 8 via the rubber bush 10, and the vehicle body side swing fulcrum is at the rubber bush 11-. A first upper arm 1.2 is pivotally connected to the vehicle body B via a first upper arm 1.2, and a first upper arm 1.2 is vertically spaced apart from the first upper arm 12 and is disposed toward the vehicle width direction (vehicle body lateral direction). The side support point is pivotally connected to the approximate center of the wheel support 8 via a rubber bush 13, and the vehicle body side swing fulcrum is attached to the cross member 9 via a rubber bush 14 and a bracket 15.
A second upper arm 16 is pivotally mounted to
It is pivotally connected to the lower end of the wheel support 8 through
A 10th arm 19 is pivotally mounted on the lower surface, and a lower link side support point disposed in the longitudinal direction of the vehicle body is attached to the 10th arm 19 via bolts 20 and 20.
A 20th arm 22 whose rocking fulcrum on the vehicle body side is a rubber band and which is pivotally connected to the lower surface of the cross member 9 via a sosh 2, and a shock serving as a shock absorber provided between the 10th arm 19 and the vehicle body B described above. It is equipped with an absorber 23.

The above-mentioned shock absorber 23 includes a coil spring 26 stretched between an upper seat 24 and a lower seat 25, and a damper 27, and the lower link side support point 23L of this shock absorber 23 is connected to the above-mentioned tenth arm 1.
It is set on the horizontal plane HOR passing through the vehicle body side swing fulcrum 19A of No. 9 or at a position above the horizontal plane HOR.

That is, a protrusion 1.9a that protrudes upward is integrally formed at a predetermined portion of the above-mentioned tenth arm]-9, and the lower link side support point 23L of the above-mentioned shock absorber 23 is attached to this protrusion 19a. The support point 23L is set at a position higher than the horizontal plane HOR.

In addition, a stabilizer 28 is stretched between the left and right 10th arms 19 and 1.9, and two pinion shafts linked to the steering wheel via a steering shaft are provided and attached to the lower end of the pinion shaft 29. A front wheel steering rod is disposed so as to be movable in the left and right direction via a rack and pinion mechanism, and a tie rod 31 is interposed between the tip of the front wheel steering rod and the above-mentioned wheel support 8 via a rubber bushing 30. ing.

In this way, since the lower link side support point 23L of the shock absorber 23 is located on the horizontal plane HOR or above it, the tenth arm 19 moves upward via the wheel 1 and the wheel support 8 when bumping. When displaced, the above-mentioned shock absorber 23
The 0-arm 19 is displaced inward from the vehicle body from the start of the bump along a virtual arc locus C centered on the vehicle body side rocking fulcrum 19A.

As a result, it is possible to reliably prevent interference between the shock absorber 23 and the wheel 1, specifically, between the coil spring 26, the extension portion 8a of the wheel support 8, and the first upper arm 12 during bumps.

In addition, the upper arm has two upper and lower upper arms 12.
, 16, and an upper first upper arm 12.
to regulate the displacement of the wheel support 8 in the longitudinal direction of the vehicle body,
Since the second upper arm 16 on the lower side is configured to restrict the displacement of the wheel support 8 in the vehicle width direction, the first upper arm 12 described above can be arranged at a large distance from the rotation axis of the wheel ↓, and as a result, , the above-mentioned first upper arm 12
A soft elastic bushing can be used as the rubber bushing 11 provided at the swinging fulcrum on the vehicle body side, which has the effect of eliminating brake shudder and improving ride comfort at the same time.

Furthermore, since the lower second upper arm 6 restricts the displacement of the wheel support 8 in the vehicle width direction, by selecting the arrangement relationship with the lower arm etc.
The disadvantage of the conventional device described in Japanese Patent No. 2, that is, the camber change is large during bumps and rebounds, can be overcome, and the camber changes during bumps and rebounds can be optimized.

In the correspondence between the configuration of this invention and the above-described embodiments, the upper link of the present invention corresponds to the first upper arm 12 and the second upper arm 16 of the embodiment, and similarly, the upper upper link corresponds to the first upper arm 16 of the embodiment. ↓ Corresponding to 2, the lower upper link corresponds to the second upper arm 16, the lower link corresponds to the 10th arm 19 and the 20th arm 22, and the shock absorber corresponds to the shock absorber 23. This invention is not limited to the configuration of the above-described embodiment.

For example, in the embodiment described above, the first upper arm 12 extending from the upper end of the wheel support 8 toward the rear of the vehicle body is used, but a first upper arm extending from the upper end of the wheel support 8 toward the front of the vehicle body may also be used.

1”-

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an elevational view of a double wishbone suspension system for a vehicle as seen from the rear of the vehicle; FIG. 2 is a plan view of the suspension system. 1... Wheel 12... First upper arm 16... Second upper arm 19... 10th arm 19A... Vehicle body side swing fulcrum 22... 20th arm 23... Shock absorber 23L ... Lower link side support point B ... Vehicle body HOR ... Horizontal surface JP-A-3 61103 (5)

Claims (1)

[Claims] (1) The upper link and the lower link support the wheel in a vertically swingable manner, and the upper link is composed of an upper upper link and a lower upper link that are arranged at a predetermined interval in the vertical direction, A suspension device for a vehicle in which an upper upper link is arranged in the longitudinal direction of the vehicle body, a lower upper link is arranged in the lateral direction of the vehicle body, and a shock absorbing device is provided between the lower link and the vehicle body, the lower upper link of the shock absorbing device being provided with a shock absorbing device. A suspension device for a vehicle in which a link side support point is set on a horizontal plane passing through the vehicle body side swing fulcrum of the lower link or at a position above the horizontal plane.