JPH0672117A - Rear suspension used for automobile - Google Patents

Abstract

PURPOSE:To improve travelling stability and operating stability of an automobile using an axle type accelerator when the automobile turns or travels straight to receive external disturvances. CONSTITUTION:A pair of upper links 13, 14 locate the instantaneous rotary center C behind the axis 50 of a rear axle 45 to connect the rear axle 45 to the chassis 31 at a proper interval in the lateral direction of the chassis 31. A pair of lower links 15, 16 are located below a pair of upper links 13, 14 so that the rear axle 45 is connected to the chassis 31 at a proper interval in the lateral direction of the chassis 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension used for automobiles.

[0002]

BACKGROUND ART The rear suspension of large automobiles such as trucks and buses is mainly an axle type suspension method. And, this axle type suspension method has a pair of parallel links arranged in parallel at an appropriate interval in the lateral direction of the chassis, and an appropriate interval in either the vertical direction from the pair of parallel links. A structure that combines with a V-link placed apart is adopted. Especially, since the instantaneous rotation center of the V-link is located in front of the rear axle axis in the front-rear direction of the vehicle body, When the front wheels are steered by, a force corresponding to the centrifugal force is generated between the tires of the rear wheels and the road surface.
The axle is rotated about its instantaneous center of rotation, causing the rear wheels to steer in the opposite direction to its front wheels, resulting in weaker under steering, more yawing and greater steering stability than that of the independent suspension method. Was also a disadvantage. The same was true when a vehicle was subjected to lateral force due to a disturbance.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to improve the running stability and steering stability of a vehicle using an axle type axle when the vehicle is turning or is subjected to disturbance during straight running. In the provision of suspension.

[0004]

[Means corresponding to the problem and its action]
A pair of upper links connects the rear axle to the chassis at appropriate intervals laterally of the chassis with the instantaneous center of rotation located posterior to the rear axle axis, and a pair of lower links. Is located below the pair of upper links and connects the rear axle to the chassis at appropriate intervals in the lateral direction of the chassis. When a force corresponding to the centrifugal force generated on the vehicle and a lateral force due to a disturbance act on the rear axle, the rear axle is rotated around its instantaneous center of rotation to understeer the rear wheel.

[0005]

DESCRIPTION OF SPECIFIC EXAMPLES Specific specified examples of the rear suspension used in the automobile of the present invention will be described with reference to the drawings. 1 and 2 show a specific example 10 of a rear suspension used in a vehicle of the present invention applied to a rear engine bus 30.
The rear suspension 10 includes left and right air springs 11, 11, 12, which support the left and right axle tubes 33, 34 of a rear axle 45 on a chassis 31 by using left and right air spring seats 17, 18. 12
And a pair of upper links 13 and 14 and a pair of lower links
Of course, the rear axle 45 is fixed to the rear wheels 37, 38, 39, 40 at both ends.

The pair of upper links 13 and 14 are
The instantaneous rotation center C is set to the left and right axle tubes 33,
The chassis 31 should be positioned rearward of the axis 50 of the 34.
The rear axle 45 was connected to the chassis 31 at appropriate intervals laterally. Specifically, the pair of upper links 13 and 14 have the instantaneous rotation center C at the intersection of the virtual axes 51 and 52 extending rearward on the axis.
The axis 50 of the left and right axle tubes 33, 34
The rear axle 45 and the chassis 3 are inclined rearward with respect to the chassis 31 at appropriate intervals in the lateral direction of the chassis 31.
Concatenated to 1. Regarding the specific attachment, the upper links 13 and 14 are such that the front end of the upper link 13 and 14 is the chassis 31 and the bracket 1 of the cross beam 32 is attached.
A bracket which is rotatably connected to 9 and 20 via a rubber bush (not shown) with a pin (not shown), and whose rear end is arranged above the axle cover 42 of the final reduction gear 41. It is arranged between the rear axle 45 and the chassis 31 at a place where it is rotatably connected to the pin 21 by a pin (not shown) via a rubber bush (not shown).

In the upper links 13 and 14, the instantaneous center of rotation C is in the range S of 30 to 300 mm.
Axle tube 3 on the left and right that is set appropriately in
It is located behind the axis 50 of 3,34, and the amount of understeer, so-called compliance steer, is optimized.

The pair of lower links 15 and 16 are positioned below the pair of upper links 13 and 14, and the rear links thereof are arranged at appropriate intervals in the lateral direction of the chassis 31.
Axle 45 was connected to its chassis 31. Specifically, the pair of lower links 15 and 16 are separated downward from the pair of upper links 13 and 14, and are parallel to each other at appropriate intervals in the lateral direction of the chassis 31. It was connected to the rear axle 45 and chassis 31. And about the concrete installation,
The lower links 15 and 16 are rotatably connected at their front ends to the brackets 22 and 23 of the cross beam 32 by means of pins (not shown) with rubber bushes (not shown) interposed therebetween. Air springs on the left and right
Use a pin (not shown) to attach a rubber
It was arranged between the rear axle 45 and the chassis 31 where it was rotatably connected through a bush (not shown).

Next, the operation of the rear suspension 10 when the rear engine bus 30 runs will be described. Now, when the rear engine bus 30 travels on the road surface at high speed, as shown in FIG. 2, when the front wheels 35 and 36 are steered to the left by the steering wheel,
The F corresponding to the centrifugal force F _C is applied to the rear wheels 37, 38, 39,
The force is generated between the tire of No. 40 and the road surface thereof, and the force F causes the rear axle 45 to rotate in the direction of the arrow _{RL about} the instantaneous center of rotation C while bending the rubber bush. . In this case, the understeer of the rear axle 45 around the instantaneous rotation center C, that is, the compliance steer, is the front wheel 3
In the same phase where the steering directions of 5, 36 are the same, the rear engine bus 30 acts in a straight line, and as a result, in this rear engine bus 30,
Improves running stability when the steering wheel is steered at high speeds.

When the rear engine bus 30 travels straight at a high speed and receives a disturbance, for example, when a strong crosswind is applied to the vehicle body, the rear axle is under steered according to the strong crosswind. , So-called compliance steering occurs, and the same effect as in the case of the above-mentioned steering, so-called,
By reducing the rotational movement of the rear engine bus 30, the stability during high-speed traveling is improved, and the steering stability is also improved.

As is apparent from the embodiments of the present invention described above with reference to the drawings, those having ordinary skill in the art to which the present invention pertains have the following contents of the present invention. In order to accomplish the object of the invention, it is essential to the formation of the invention and is derived from the technical essence of the invention which is the nature of the invention, and to an embodiment that is objectively recognized to be internal Easily materialized.

[0012]

As will be understood from the above, the rear suspension used in the vehicle of the present invention has a chassis in which the pair of upper links position the instantaneous center of rotation behind the axis of the rear axle. The rear axle to the chassis at appropriate intervals in the lateral direction of the chassis, and a pair of lower links are positioned below the pair of upper links to provide appropriate lateral spacing of the chassis. Since the rear axle is connected to the chassis with the rear suspension, the rear suspension used in the vehicle of the present invention is designed to respond to centrifugal force and lateral force when the vehicle turns or is subjected to disturbance during straight running. The rear axle is steered in-phase with the front wheels by the force generated between the wheel tires and the road surface,
It is so-called under-steered to stabilize turning and straight running, that is, to improve running stability and steering stability, and as a result, it is very useful and practical for automobiles, especially large automobiles.

[Brief description of drawings]

FIG. 1 is a plan view showing a specific example of a rear suspension used in a vehicle of the present invention applied to a rear engine bus.

FIG. 2 is an operation explanatory view of the rear suspension shown in FIG.

[Explanation of symbols]

 11 Air Spring 12 Air Spring 13 Upper Link 14 Upper Link 15 Lower Link 16 Lower Link

Claims (2)

[Claims] 1. A pair of upper links connect the rear axle to the chassis at appropriate intervals laterally of the chassis with the instantaneous center of rotation located posterior to the axis of the rear axle, and Rear suspension used in a vehicle in which a pair of lower links are located below the pair of upper links and connect the rear axle to the chassis at appropriate intervals in the lateral direction of the chassis. . 2. The instantaneous center of rotation of the pair of upper links is 30 to 300 m from the axis of the rear axle.
A rear suspension for use in a motor vehicle as claimed in claim 1, located rearwardly.