JPH0225681Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a rear suspension of a vehicle, and in particular to a rear suspension that supports a carrier for the rear wheels by two arms arranged in the lateral direction of the vehicle body. Regarding.

(Prior Art) A parallel arm type rear suspension includes two arms arranged laterally of a vehicle body and a carrier supported by these arms. Rubber bushings are used at the connection of each arm to the vehicle body and carrier to prevent vibration and noise.

The rear wheel suspension system disclosed in Japanese Patent Publication No. 58-48366 has a so-called trapezoidal arrangement in which the distance between the support points on the carrier side of the two arms is smaller than the distance between the support points on the vehicle body side.

(Problem to be solved by the invention) If the connecting part has sufficient rigidity and only moves geometrically, during driving or braking,
The toe angle of the tire does not change. But in reality,
As mentioned above, since the rubber bush has a connecting portion interposed therebetween, the rubber bush bends during driving or braking, and the toe angle becomes toe-in during driving and toe-out during braking. Of these toe changes, toe-out during braking is considered undesirable from the viewpoint of running stability.

According to the rear wheel suspension system described in the above publication,
The geometrical arrangement of the two arms allows the tire to be toe-in during braking, improving running stability during braking. On the other hand, this rear wheel suspension system causes toe-out during driving, which is disadvantageous in terms of running stability during driving.

An object of the present invention is to provide a rear suspension for a vehicle that allows toe-in of the rear wheels both during driving and during braking.

(Means for Solving the Problems) A rear suspension of a vehicle according to the present invention is connected to the vehicle body so as to be able to swing around a horizontal axis extending in the front-rear direction and displaceable in the front-rear direction. The arranged first arm is connected to the vehicle body so as to be swingable around a horizontal axis extending in the front-rear direction,
a second arm disposed in the lateral direction of the vehicle body; a carrier supported by the first and second arms to which the rear wheels are attached; and a portion of the vehicle body remote from the first and second arms. a swinging member supported swingably; a first link connected to the first arm at one end and to the swinging member at the other end; and a first link coupled to the second arm or the carrier at one end; a second link connected to the swinging member at the other end, and the first and second links are arranged such that when a forward and backward force is applied to the second link,
The first arm is displaced in the front-back direction by the displacement of the second link, the rocking of the swinging member, and the displacement of the first link, and the rocking is performed so that the rear wheel is toe-in. connected to the member.

The first and second links depend on the geometric configuration of the first arm and the second arm, and whether the first arm is forward or rearward of the second arm. Therefore, it is connected to the swinging member at different locations.

(Example) The rear suspension 10 includes an arm 12, an arm 14, and a carrier 16.

The arm 12 is connected to the vehicle body 15 so as to be swingable around a horizontal axis extending in the front-rear direction and to be movable in the front-rear direction.

In the illustrated example, a shaft 18 is attached to the vehicle body 15 with its axis oriented in the front-rear direction, and a rubber bush 20 having a spline is bonded to the shaft 18. On the other hand, an eye 22 provided at the end of the arm 12 is provided with a rubber bushing 24 having a spline.
are glued together, and the eye 22 is attached to the shaft 18 by engaging both splines. As a result, the arm 12 can swing around the shaft 18 and can be displaced in the front-rear direction. The arm 12 is arranged in the lateral direction of the vehicle body 15.

Arm 14 has an eye 26 at its end. The arm 14 is connected to the vehicle body 15 via a rubber bush (not shown) attached to the eye 26 so as to be swingable around a horizontal axis 28 extending in the front-rear direction. The arm 14 is disposed behind the arm 12 in the lateral direction of the vehicle body. In the illustrated example, arm 14 is parallel to arm 12.

The carrier 16 is connected to the arm 12 via a support portion 30 and to the arm 14 via a support portion 32, and is supported by both arms 12 and 14. Rubber bushings (not shown) are attached to both supports. The carrier 16 rotatably supports the rear wheel 34.

A support rod 36 is fixed to the vehicle body 15 at a portion remote from the arms 12 and 14, and is arranged laterally. A swinging member 38 is swingably attached to the support rod 36. In the illustrated example, the support rod 36
is located in front of the arm 12, and the swinging member 38 is formed in a cylindrical shape and is arranged around the support rod 36 with a rubber bush 40 interposed therebetween, as shown in detail in FIG. The rubber bush 40 is bonded to the support rod 36 and the swinging member 38.

The link 42 is connected to the arm 12 at one end and to the swinging member 38 at the other end via a ball joint 44, respectively. On the other hand, the link 46 is connected to the carrier 16 at one end and to the swinging member 38 at the other end via a ball joint 45, respectively.

In the illustrated example, direction A is the forward direction, and when the vehicle starts running, a forward force is applied from the rear wheels 34 to the link 46, and when the running vehicle brakes, the force is applied backward from the rear wheels 34 to the link 46. The power of works. Therefore, as shown in FIG. The swinging members 3 are arranged so that the joint 44 is on the upper side of the swinging member 38 and the ball joint 45 is on the lower side of the swinging member 38, which is a so-called opposite side arrangement.
It is attached to 8.

(Operation of the embodiment) When the vehicle starts running, driving force is transmitted from the rear wheel 34 to the link 46 as a forward force, and the swinging member 38 uses this force to move an amount corresponding to the rigidity of the rubber bush 40. It is rotated counterclockwise in FIG. 2 about the support rod 36. Swing member 38
When rotates, the link 42 is pushed backwards,
The arm 12 is displaced rearwardly along the axis 18.
Due to this displacement, the support portion 30 of the arm 12 to the carrier 16 is displaced inward in the lateral direction of the vehicle body, as shown by the imaginary line in FIG. 1, and the rear wheel 34 is toe-in.

When a running vehicle brakes, the braking force is transmitted from the rear wheel 34 to the link 46 as a backward force,
The swinging member 38 is rotated clockwise around the support rod 36. When the swinging member 38 rotates, the link 4
2 is pulled forward, displacing arm 12 forward along axis 18. Due to this displacement, the support portion 30 of the arm 12 to the carrier 16 is displaced inward in the lateral direction of the vehicle body, and the rear wheel 34 becomes toe-in.

(Another example) When the arm 12 and the arm 14 are arranged in parallel and the swinging member 38 is located at the rear of the arm 12, that is, when direction B is the front of the vehicle, the relationship between the arm 12 and the vehicle body is The connecting portion is made immovable, and the connecting portion of the arm 14 and the vehicle body 15 is configured to be movable in the front and rear direction, and the link 42 is connected to the arm 1.
4 through a ball joint. In this case, the positional relationship between the swinging member 38 and each ball joint 44, 45 is as shown in FIG.
It may be arranged on opposite sides, or it is also possible to arrange both ball joints above or below the swinging member 38, so-called on the same side.

When the arms 12 and 14 are arranged in a so-called trapezoidal arrangement and the swinging member 38 is located in front of the arm 12, the connection part of the arm 12 with the vehicle body is made immovable, and the connection of the arm 14 with the vehicle body 15 is made immovable. The connecting portion is configured to be movable in the front-rear direction, and the link 42
can be connected to the arm 14 via a ball joint. In this case, the rocking member 38 and each ball joint 44, 45 are positioned on opposite sides.

Combinations other than those described above are also possible.

Further, the link 46 is an arm that does not move back and forth outside the carrier 16, and in the illustrated example, the arm 14.
It can also be connected to

(Effects of the invention) According to the invention, one of the two arms is connected to the vehicle body so as to be movable in the longitudinal direction and swingable around the horizontal axis, and this arm can be used for driving force and braking force. When activated, the two links and the swinging member force the rear wheels into displacement and actively toe-in the rear wheels, improving running stability during driving and braking.

[Brief explanation of drawings]

FIG. 1 is a plan view of the rear suspension according to the present invention, showing the right side, and FIG. 2 is a side view as seen from the direction of arrow 2 in FIG. 10: Rear suspension, 12, 14: Arm, 16: Carrier, 18: Axis, 20, 24, 4
0: Rubber button, 38: Swinging member, 42, 4
6: Link, 44, 45: Ball joint.

Claims (1)

[Scope of utility model registration request] The first arm is connected to the vehicle body so that it can swing around a horizontal axis that extends in the front-rear direction and can be displaced in the front-rear direction, and is arranged in the lateral direction of the vehicle body, and can swing around the horizontal axis that extends in the front-rear direction. a second arm connected to the vehicle body and disposed in the lateral direction of the vehicle body;
a carrier to which a rear wheel is attached, supported by the first and second arms; a swinging member swingably supported by a part of the vehicle body remote from the first and second arms; a first link connected to the first arm at the other end to the swinging member; and a second link connected to the second arm or the carrier at one end and to the swinging member at the other end. a link, the first and second links are arranged such that when forward and backward forces are applied to the second link, the second link is displaced, the swinging member swings, and the first by the displacement of the link of said first
A rear suspension of a vehicle, the rear suspension of the vehicle being connected to the swinging member so as to displace the arm in the front-rear direction and toe-in the rear wheel.