JPS5830724Y2 - Trailing arm type vehicle suspension system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trailing arm type wheel suspension system, and more particularly to a trailing arm type wheel suspension system that does not cause poor maneuverability when turning even at 11 o'clock.

In conventional trailing arm type suspension systems, the trailing arm, which is provided on the width side of the wheel, is connected to the vehicle body via a pivot joint with a built-in anti-vibration suspension. However, when the vehicle turns, the lateral force acting on the wheels acts on the pivot joint, resulting in a reduction in the lateral rigidity of the trailing arm and The disadvantage was that it resulted in a decrease in maneuverability.

That is, as shown in FIG. 1, taking as an example a conventional trailing arm that can extend to the left rear wheel side, if the vehicle turns right, the lateral force F acting on the wheel 1 causes External forces y and F'' act on the outer pivot point P and the inner pivot point Q of the trailing arm 2, respectively.

For this reason, the bushings applied to the pivot points P and Q are largely deflected by the components of the external forces y and F'' in the longitudinal direction of the vehicle, and as a result, the trailing arm 2d: The wheel 1 which is displaced and supported by the trailing arm produces a turning angle in the direction i/C which intensifies the turning.

Therefore, the conventional suspension system tends to increase the degree of so-called oversteering, which has the drawback of causing low maneuverability during stitching.

Therefore, an object of the present invention is to provide a trailing arm that does not cause poor maneuverability even when the vehicle is in a turning position.
, to provide a large wheel suspension system.

The present invention utilizes the lateral force that acts on the wheels when the vehicle is turning to move the trailing arm that supports the middle wheel so that the wheels create a turning angle in a direction that suppresses the turning of the vehicle. It is characterized in that it is changed by fX'f.

The features of the present invention will become clearer from the following description of the illustrated embodiments.

The trailing arm type wheel suspension system according to the present invention or the second
The figures and the third figure are generally designated by the numeral 10.

FIG. 2 is a view of the suspension system 10 as seen from the top of the vehicle, and FIG. 3 is a view of the suspension system as seen from the side of the vehicle.

As shown in FIG. 2, the AiJ suspension system 10 includes a trailing arm 12 that extends in the longitudinal direction of the vehicle.

The rear outer side of the trailing arm, that is, the arm 1
An axle 16 for a wheel 14 (left rear wheel in FIG. 1) is provided on the outer side of the vehicle body at the rear of the vehicle.

Further, a pair of ball shafts 18.degree. 20 serving as pivot portions are provided on both sides of the front portion of the arm 12.

The ball shafts 18 and 20 are aligned with each other in the width direction of the vehicle body and protrude integrally from the arm 12.

The arm 12 is supported by the vehicle body via a pair of brackets 22 and 24 that receive ball shafts 18 and 20 so as to be able to swing vertically.

That is, one bracket 22 located on the outer side of the vehicle body includes a spherical bearing portion 26 that receives the spherical portion of the ball shaft 18 .

The bearing portion together with the ball portion of the ball shaft 18 constitutes a ball joint.

The bracket 22 is supported on the front side of the bearing portion 26 via a pivot shaft 28 supported by the vehicle body so as to be able to swing about the pivot shaft in a substantially horizontal plane.

A cylindrical bushing 30 made of an elastic material for vibration absorption is installed between the bracket 22 and the pivot shaft 28.

A stopper 32 is disposed on the outside of the bent bracket 22, and is fixed to the vehicle body. The stopper 32 contacts the bracket and prevents the bracket from swinging outward.

The other bracket 24 located on the inside of the vehicle body is
The bracket is provided with a bearing part 34 for receiving the ball part of the ball shaft 20 and forming a ball joint together with the ball part.

This other bracket 24 is connected to a pivot 3 similar to the above-mentioned one supported by the vehicle body on the rear side of the bearing portion 34.
6, and is supported so as to be able to swing in a substantially horizontal plane about the pivot shaft, and between the pivot shaft and the bracket 24,
A cylindrical bushing 38 similar to that described above is incorporated.

Accordingly, said arm 12 is connected to a pair of brackets 22.24.
It is supported by the vehicle body via the ball shafts 18 and 20 so as to be able to swing vertically about an axis that coincides with the ball shafts 18 and 20.

Further, between the arm 12 and the vehicle body, as shown in FIG. 3, there is a coil spring 40 button for elastically supporting the arm 12 on the vehicle body, and a shock absorber for damping the vibration of the spring. 42 are arranged.

The suspension system 10 is also applied to the right rear wheel, and is used as a pair of left and right wheels.

The movement of the trailing arm 12 of the suspension system 10, which moves when the vehicle turns, will be explained below with reference to the mechanical diagram shown in FIG. 4 for the left rear wheel.

In Fig. 4, one ball shaft 18 is located on the outside of the vehicle body.
The joint portion between the bracket 22 and one bracket 22 is indicated by the symbol A,
The joint between the other ball shaft 20 and the other bracket 24 located on the inside of the vehicle body is indicated by the symbol B, and each pivot shaft 28.36, which is the center of swing of each bracket 22, 24, is indicated by the symbol C5D. is shown.

In the wheel suspension system 10, when the vehicle turns to the right, the lateral force F applied to the wheel 14 causes external forces y and F'' to act on the points A and B, respectively, via the trailing arm 12.

As a result, the point A is rotated about point C toward point A', and the point B is rotated about point C toward point ``.

As a result, the front part of the trailing arm 12 moves inward of the vehicle body as shown by the dotted line as the two points A and B are rotated toward A' and B', and the front part of the trailing arm 12 is supported by the arm 12. The wheels 14 turn to the right in the same direction as the vehicle turns to the right.

This turning angle of the wheels 14 gives a tendency to suppress turning, that is, a tendency to strengthen understeering characteristics, and thereby improves the steering stability of the vehicle that is prone to turning.

Furthermore, although the lateral force F applied to the wheels 14 varies greatly depending on the turning angle button of the vehicle and the turning speed, the turning angle of the wheels can be suitably adjusted according to this lateral force F, that is, according to the turning conditions of the vehicle. It is possible to always ensure steering stability when turning the vehicle.

When the button is pressed when the vehicle turns left, a lateral force in the opposite direction to the lateral force F acts on the wheels 12, and the points A and B try to rotate outward from the vehicle body. , the stopper 32 contacts the outer bracket 22 to prevent the bracket from swinging outward.

Therefore, in this case, no turning angle occurs in the wheel 12.

FIG. 5 shows a shaft pin 18 as the pivot portion of the arm 12.
An example is shown in which cylindrical bushes 26' and 34' made of elastic bodies are used in the bearing portions of a pair of brackets 22 and 24 that receive the shaft pins.

The cylindrical bushes 26', 34' provided on each of the brackets 22, 24 are configured to support lτi of the shaft pins 18', 20'.
] by allowing the arm 12 to swing in the vertical direction as described above, and also by causing deflection in the radial direction when the wheel receives a lateral force F, as shown in FIG. Allows displacement similar to that of

According to the present invention, as described above, when the vehicle turns, the lateral force applied to the rear wheels is used to generate a turning angle in the wheels in the direction of the binding of the vehicle, thereby increasing the understeering characteristic. By giving this, the maneuverability of the vehicle can be improved.

In addition, the cutting angle of the wheel is an appropriate wheel cutting edge angle depending on the turning conditions such as the turning dust of the vehicle and the turning speed.

However, even if a relatively soft bushing is applied to the pivot portion of each bracket to the heavy body in order to support the trailing arm on the heavy body, the rigidity of the trailing arm in the lateral direction, that is, in the middle direction of the vehicle body Vibrations transmitted from the wheels can be effectively absorbed by the bushings without reducing the noise, thereby reducing noise inside the vehicle.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the mechanism of a conventional trailing arm type wheel suspension system, and FIGS. 2 and 3 each schematically show a trailing arm type wheel suspension system according to the present invention. 4 is a plan view and a side view, FIG. 4 is a drawing similar to FIG. 1 showing the mechanism of the wheel suspension shown in FIG. 2, and FIG. 5 is a drawing showing another embodiment of the present invention. It is a drawing similar to Fig. 2. 12... Trailing arm, 14... Wheel, 16
...Axle, 18, 18', 20, 20'...
Pivot part, 22° 24...Pair of brackets, 26, 2
6', 34°34'...Bearing part, 2B, 36...
- Pivot, 32... stopper means.

Claims (1)

[Scope of utility model registration request] It has a pair of pivot parts on both sides (~, a trailing arm on which the axle of the wheel is provided, and a bearing in which the pivot part is received in order to support the trailing arm 1 on the vehicle body so as to be able to swing in the vertical direction. The bracket includes a pair of brackets provided with a portion, a stopper means, etc., and one of the brackets receives one of the pivot portions located on the outer side of the vehicle body, and the one bracket receives the pivot portion located on the outer side of the vehicle body. The other 1Y1 bracket, which receives the other pivot part, is supported by the vehicle body so as to be able to swing in a substantially horizontal plane. A trailing arm type wheel suspension device, wherein the trailing arm type wheel suspension device is supported so as to be swingable in a substantially horizontal plane, and the stopper means restrains the displacement of the trailing arm toward the outside of the vehicle body.