JPS5940915A - Vehicle suspension system - Google Patents

Abstract

PURPOSE:To give the function of self-steering to a second rear axle in a two rear axle type vehicle provided with two axles having leaf-springs and torque rods, by providing such an arrangement that the torque rod for the first axle is horizontally attached but the torque rod for the second axle is attached to incline rearwardly downward. CONSTITUTION:For example, if a vehicle turns to the left, the vehicle is inclined to the right due to the centrifugal force so that a torque rod 3 horizontally attached to a first rear axle 4 on the right side of the vehicle is swung in the direction of the arrow B by an angle of DELTAalpha, and moves forward by a slight distance 11. Meanwhile, a torque rod 6 for a second rear axle 7 is made to have an attaching angle of alpha-DELTAalpha due to the swinging of the angle of DELTAalpha since the torque rod 6 is previously set to be inclined at an angle of alpha, and therefore, is pushed out rearward by a long distance of 12 so that the second rear axle and the wheels are twisted clockwise to increase the distance CR. Similarly, the distance CL on the opposite side of the vehcile is reduced. Thus, the second rear axle 7 may carry out the self-steering function.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a suspension system for a vehicle, and particularly to a suspension system for a vehicle with two rear axles, which provides a self-steering function to the second rear axle with an extremely simple configuration. Regarding equipment.

In the conventional suspension system for a vehicle with two rear axles, that is, the suspension system for the first rear axle and the second rear axle, which are equipped with a pair of plates on the left and right sides, the two axles do not have a steering function. The turning radius of the suspension system tends to change, and side forces are generated when the vehicle turns, which increases tire wear and generates excessive internal stress in various parts of the suspension system. There has also been a proposal to link the rear two axles with the steering operation of the front axle (Special Publication No. 5O-25691), but this would require a complicated mechanism, increase weight, and increase costs. There was a smoke point.

The present invention has been made to eliminate the drawbacks of the prior art described above, and its purpose is to provide a rear first shaft with a pair of plate springs and a torque rod on the left and right sides, and a second rear plate each having a pair of leaf springs and a torque rod;
In a two-axle vehicle, the second rear axle has a self-steering function when the vehicle turns, and this also improves the movement of the rear two-axle vehicle. The aim is to improve the maneuverability of the vehicle by reducing the turning radius of the vehicle, reduce the wear of the rear tires by reducing the side force, and improve the durability of the suspension by reducing the internal stress of the suspension system.

Another objective is to enable a lighter design of the suspension system by reducing internal stresses.

In short, the present invention provides a rear two-axle vehicle that is provided with a first rear shaft having a pair of leaf springs and a torque rod on the left and right sides, and a second rear shaft having a pair of leaf springs and a torque rod on the left and right sides respectively. , the torque rod of the first rear axle is installed in a substantially horizontal state, and the torque rod of the second rear axle is installed with a downward slope toward the rear of the vehicle, so that the vehicle does not turn. The second rear shaft is configured to perform cell seven steering by utilizing the fact that the swing angle of the torque rod is different on the left and right sides of the vehicle when the vehicle is tilted left and right. be.

The present invention will be explained below based on embodiments shown in the drawings. A vehicle suspension system 1 according to the present invention includes a rear first shaft 4 equipped with a pair of leaf springs 2 and a torque rod 3 on the left and right sides (both shown only on the left side), and a pair of leaf springs 5 on the left and right sides. and a rear second shaft 7 equipped with a torque rod 6 (both shown only on the left side)
(10.1) One end 2a, 5a of each leaf spring 2, 5 is connected to a spring plastic via a shackle 8, 9.
1 is attached to the chassis frame 12, and the other end of each leaf spring 2, 5 is connected to the spring plastic fitting (2t), 5btj:, i' via the spring member 13, 14) 15°. 1
6 is attached to the chassis frame 12.

Torque rods 3 and 6 have zigzag Indian portions 3a and 3b.

Rubber bushings 17 are interposed between 6a and 6b. The rubber members 13, 14 and the rubber pusher 17 are selected to have appropriate rubber hardness ratios, and appropriate lengths and locations of the torque rods 3, 6.

That is, the torque rod 3 is installed substantially horizontally, and the torque rod 6 is installed with a downward slope toward the rear of the vehicle, and as shown in FIG. An angle α is given for the angle α. When the vehicle tilts to the left or right due to turning, the rear second shaft 7 is configured to self-steering by utilizing the fact that the swing angle Δα of the torque rod 6 is different between the left and right sides of the vehicle.

In addition, in order to compensate for the reduction in lateral rigidity of the vehicle suspension system 1 due to the interposition of the rubber members 13 and 14, as shown in FIG. (Later 2nd
(only shaft 7 shown) and cross member 1 of chassis frame 12
A lateral rod L may be installed between the lateral rod 2a and the lateral rod L.

In FIG. 1, 18 and 19 are torque rods 3 and 6.
20 is a bracket for attaching the torque rod 3 to the rear first shaft 4, and 21 is a bracket for attaching the torque rod 6 to the rear second shaft 7. , 22 is a U port, 23 is a pad, and 24° and 25 are wheels.

The present invention is constructed as described above, and its operation will be explained below. As shown in FIG. 4, for example, when a vehicle attempts to turn to the left as indicated by arrow A, the centrifugal force acts in the right direction in the direction of travel, so the vehicle leans to the right due to the combined force with its own weight. This causes the right axle to sink and the left axle to rise. To explain this in more detail with reference to FIGS. 2 and 3, on the right side of the vehicle shown in FIG. , it swings by an angle Δα as shown by arrow B, and the rear first shaft 4 only moves forward by a very small distance l.

On the other hand, since the torque rod 6 of the second rear shaft 7 is set at an angle α in the initial state, by swinging by an angle Δα as shown by arrow B, the angle α becomes α − Δα, or a kana Big distance! , so that the second rear shaft 7 is pushed rearward, and the second rear shaft and wheel 25 are twisted clockwise in FIG. 4. This increases the distance cR.

Next, on the left side of the vehicle, the torque rod 3 of the rear first shaft 4 swings from the initial state shown by the solid line by an angle Δα as shown by the arrow, as shown by the imaginary line 6-.
The axis 4 is only moved forward by a very small distance 11, this distance l, which is almost the same as in the case of Fig. 2. As a result of the above, even if the vehicle turns to the left, the first rear shaft 4 hardly moves as shown in FIG. 4, and self-steering is not performed.

On the other hand, since the apprentice two-axis torque rod 6 has an angle α in its initial state, it has an angle Δ as shown by the arrow.
By swinging by α, the angle α becomes α + Δα, which is a quite large distance! /! This acts to pull the second rear shaft 7 forward, and the second rear shaft 7 and the wheels 25 are twisted clockwise in FIG. 4. As a result, the distance M, Cr.

becomes shorter.

As described above, in the rear second shaft 7, the swing angle Δ of the torque rod 6 on the left and right sides of the vehicle in the second and third
As shown in FIG. 4, cell 7 steering is performed depending on the difference in α. Note that this also applies when the vehicle turns to the right. Also, rear cylinder] shaft 4 and rear second shaft 7
The unreasonable force that acts on the rubber member 13 when the vehicle turns is
．． 14 and rubber bush 17 absorb and relax. The lateral rigidity is reinforced by the lateral rod L.

Since the present invention is configured and operates as described above, the present invention includes a rear first shaft having a pair of leaf springs and a torque rod on the left and right sides, and a pair of leaf springs and a torque rod on the left and right sides. In a vehicle with two rear axles provided with a second rear axle, an effect can be obtained in which the second rear axle can be the main driver of the self-steering function when the vehicle turns, and as a result, the dynamic rotation of the vehicle with two rear axles can be improved. It is possible to improve the maneuverability of the vehicle by reducing the radius, it is also possible to reduce wear on the side tires by reducing the side force, and it is possible to reduce the internal stress of the suspension system to improve its durability. The effect that can be obtained is obtained. Furthermore, the reduction in internal stress has the effect of making it possible to design the suspension system to be lighter in weight.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the present invention; FIG. 1 is a side view of a suspension system of a vehicle; FIG. 2 is a schematic diagram of a mechanism showing the operating state of a torque rod on the right side of a vehicle when the vehicle turns to the left; Fig. 3 is a schematic diagram of the mechanism showing the operating state of the left torque rod, Fig. 4 is a schematic plan view of the rear two axles and wheels, showing the self-steering state when the vehicle turns to the left, and Fig. 5 is a schematic plan view of the rear two axles and wheels. This is the rear case of the suspension system showing the installation state of the lateral rod. 1 is a suspension system of the vehicle, 2 and 5 are plate springs, 3 and 6 are torque rods, 4 is a rear first shaft, 7 is a rear second shaft, and Δα is a swing angle of the torque rod. Patent applicant Hino Motors Co., Ltd. Agent Patent attorney 1) Kazuo = 9- 85- Figure 1! Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In the rear 2@ vehicle, a rear first shaft is provided with a pair of leaf springs and a torque rod on the left and right sides, and a rear second shaft is provided with a pair of leaf springs and a torque rod on the left and right sides, respectively. The torque rod of the first axis is installed in a substantially horizontal position, and the torque rod of the second axis is installed with a downward slope toward the rear of the vehicle, so that the vehicle is not turning. A suspension for a vehicle characterized in that the second rear shaft is configured to self-steering by utilizing the fact that the swing angle of the torque rod is different on the left and right sides of the vehicle when the vehicle is tilted left and right. Device.