JPH04353078A - Steering stabilizer device - Google Patents

Abstract

PURPOSE: To provide a steering stabilizer device with simple constitution and operation and stable in running at a high road speed by changing the direction of a rear steering axle only when the steering angle of a front steering axle corresponds to or exceeds a prescribed angle. CONSTITUTION: A rear steering axle 3b is steered to the left when a front steering axle 3a is steered to the right and steered to the right when it is steered to the left. A mechanism member 21 is provided to transmit a steering operation of the front steering axle 3a to the rear steering axle 3b in coordination with a lever 22 and a relative connection rod 23 so that the rear steering axle changes its direction only when the steering angle of the front steering axle 3a corresponds to or exceeds a prescribed angle.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering and stabilizing device for a vehicle with multiple axles.

0002

BACKGROUND OF THE INVENTION An axle connects the wheels of a land vehicle to the chassis through a suspension system for securing and steering purposes. This fixed axle is
The steering axle simply supports the load and provides a means to change the direction of the vehicle. For example, special purpose vehicles with multiple axles and long wheelbases, such as crane trucks, are equipped with front as well as rear axles, and sometimes also with fixed axles. Three types of multi-steering systems are commonly used in vehicles: In the younger brother type, one axle is steered while the other axle (usually the rear axle) remains stationary. In the younger brother 2, the focused type, the radii of the front and rear axles are focused at a common center. And in the younger brother type 3, all axles are steered in the same direction so that the vehicle moves like a crab when the axle direction is changed.

0003

Steering of multi-axle vehicles often presents stability problems because the rear end tends to change direction, resulting in side skids.

A major problem arises at high speeds, for example at small steering angles when moving forward and backward before and after turning.

A typical steering linkage for this type of vehicle comprises a lever and rod having a plurality of arms steered by different axles.

In the first mentioned device, the stability problem is solved by locking and unlocking the steering mechanism of a given axle using a somewhat complex drive and non-drive system.

[0007] The turning movement of the front axle is
In intensively steered axles, which are effected by turning movement of the axle, changing the direction of the vehicle results in a loss of stability that can only be resolved by reducing ground speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a steering/stabilizer device for a vehicle that is simple in construction and operation, and provides stable running even at high road speeds.

[0009]

Means and Effects for Solving the Problems The vehicle steering stabilizer device of the present invention includes front and rear steering axles, and the rear steering axle has a front steering axle that is steered to the right. The front steering axle is designed to steer to the right when the front steering axle is steered to the left.

[0010] The device also has a front steering wheel.
A mechanical member that transmits the steering motion of the front steering axle to the rear steering axle such that the rear steering axle changes direction only when the steering angle of the axle corresponds to or exceeds a predetermined angle. Equipped with

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 in the figure indicates a vehicle as a whole, and wheels 6 are mounted on a plurality of axles.

The vehicle shown in FIG. 1 has two front steering axles 3a and two rear steering axles 3a.
It has an axle 3b and one fixed rear axle 3c.

Reference numeral 17 designates a steering wheel which is connected by conventional links to the steering axle as well as to the corresponding road wheel.

Reference numeral 18 indicates that power for the steering wheel is transferred from a first lever 19 provided on the first front axle to a second lever 19 provided on the second front axle.
shows a normal rod transmitting to the lever 20 of. This second
The lever 20 is connected by a further rod 4 to a mechanical member 21, which is shown in detail in FIG. This mechanical member 21 serves, in cooperation with another lever 22 and an interconnecting rod 23, to transmit the power of the first rod 18 to the rear steering axle 3b.

[0015] The rod and lever combination described above is such that when the front axle 3a is rotated to the left (or right), the rear axle 3b is rotated to the right (or left), and the steering axle is rotated to a common center. The concentric configuration of the steering movement is substantially deemed to extend radially from the radial direction. 1 in Figure 1
The arrows indicated by 6 indicate the levers 19 and 20 attached to the front steering axle and the rear steering axle.
The different movements with the lever 22 mounted on the axle are shown. In FIG. 2, which shows in detail the mechanical member 21 for transmitting steering control from the front axle to the rear axle, reference numeral 7 designates a locking lever rotatable about a pivot 8 provided in the chassis of the vehicle 1. . The top arm of this lever 7 is connected to the corresponding rod 4, and the bottom arm is formed with an arcuate slot 10. A pin 9 of the reaction member 2 can be inserted into this slot 10.

The slot 10 is connected to the pivot 8 so that no power is transmitted to the reaction member 2 when the rotation angle of the lever 7 is below a predetermined angle, for example, when the slot can freely slide relative to the pin 9. substantially centered on
along a predetermined portion of its length. Therefore, as soon as the angle of rotation exceeds a predetermined limit, the pin 8 interferes with the part of the stud that is not arranged concentrically with the pivot 8 and the reaction member 2 is displaced by the movement of the lever 7.

The reaction member 2 is rotatable about a shaft 11 supported on the vehicle chassis to actuate a fluid control valve which opens and closes an oil line to the rear axle steering cylinder.

[0018] The control valve 12 also has a
It acts on the top arm of the other lock lever 13 attached to. The bottom arm of this lever 13 is connected to a rod 5 which ultimately transmits the movement of the steering wheel to the rear steering axle 3b of the vehicle 1.

The control valve 12 has the function of driving a plurality of conventional power auxiliary cylinders (not shown);
It has a short operating stroke (approximately 1-3 mm).

[0020] Thus, only when the front axle 3a reaches or exceeds a predetermined angle does the reference numeral 21
The direction of the rear steering axle 3b can be changed by means of the member indicated by . In fact, the steering movement can only be obtained at a certain angle, but the rear axle 3b
Since there is no steering wheel, the rear axle 3b remains in an unchanged position and remains capable of steering.

[0021]

The device according to the invention therefore makes it possible to obtain a selected steering control for the front as well as the rear axle (the steering of the rear axle is activated only in certain conditions). Therefore, extremely stable running is achieved at each relative speed.

[Brief explanation of drawings]

1 is a side view schematically showing a vehicle equipped with a device according to the invention; FIG.

FIG. 2 is an enlarged side view of a part of the apparatus shown in FIG. 1;

[Explanation of symbols]

1...Vehicle, 3a...Front steering axle,
3b... Rear steering axle, 3c... Fixed rear axle, 4... Rod, 19... First lever 19, 2
0...Second levers 20, 21...mechanism members.

Claims (3)

[Claims] 1. At least one front steering axle; the front steering axle steering to the left when the front steering axle is steered to the right;
at least one rear steering axle connected to steer to the right when the front steering axle is steered to the left, and the steering angle of the front steering axle corresponds to or exceeds a predetermined angle; a steering stabilizer for a multi-axle vehicle, comprising: a mechanical member for transmitting steering motion of the front steering axle to the rear steering axle such that the rear steering axle changes direction only when the front steering axle changes direction; Device. 2. The mechanical member for transmitting steering motion of the front steering axle to the rear steering axle is rotatable about a pivot provided on the chassis of the vehicle, and one arm is connected to a corresponding rod. and slot 1 in the other arm.
a first locking lever formed with a 0;
a pin that is rotatable about a shaft supported on the chassis of the vehicle and inserted into a slot in the first locking lever so as to be displaced by movement of the first locking lever to actuate the fluid control valve; a reaction member, pivotable about the shaft, one arm set to actuate said fluid control valve, and the other arm connected to a rod transmitting power to a rear steering axle of the vehicle; 2. The steering and stabilization device for a multi-axle vehicle according to claim 1, further comprising a second locking lever. 3. A slot formed in the first locking lever is adapted to rotate with the pivot such that the lever pivots about the pivot without displacing the pin and thus the reaction member. 3. A multi-axle vehicle steering and stabilizing device according to claim 2, having concentric sections.