JPS588621Y2 - All wheel drive vehicle steering system - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a steering device for an all-wheel drive vehicle.

When a vehicle turns, the steering wheel is rotated to rotate the steering wheel tires, and the vehicle turns according to the turning angle of the tires.

Therefore, in order to reduce the turning radius, it is necessary to increase the turning angle of the tires, but if the turning angle of the tires is increased, there is a problem that the interior space of the vehicle becomes smaller.

There is also the problem of interference with suspension links and steering links, and the current situation is that the turning angle of the tire is inevitably limited.

The present invention was developed in consideration of the above, and provides a steering device for an all-wheel drive vehicle that enables the vehicle to perform sharp turns at low speeds, much like the steering angle of normal tires. This is what we are trying to provide.

The configuration will be explained below based on the embodiment shown in the drawings.

In the figure, 1 is a steering wheel, 2 is a steering box, 3 is a pitman arm, and 4 is a drag link. By rotating the steering wheel 1, the drag link 4 is operated, and the steering wheel tires (not shown) are operated. It is designed to work in the opposite direction.

5.6 are stopper pals 7', 7.6 provided so as to come into contact with the pitman arm 3 when it is at both ends of its stroke.
Reference numeral 8 denotes an air pulp provided at a position where it comes into contact with the transmission shift lever 9 when it is in the forward l-speed position and the reverse position.

10 is brake pulp, 11 is air tank, 12.1
3 is the left and right brake chambers, and these left and right brake chambers 12.13 are made of double check pulp 14.1.
5 to a brake valve 10 and a stopper valve 5.
It is connected to 6.

The stop valve 5.6 is connected to the air tank 11 via an air pulp 7.8.

The stopper valve 5.6 and the air valve 7j8 are the second
As shown in the figure, when the stopper 16 is pushed against the spring, air from the inflow port 17 flows to the outflow port 18.

The double check pulp 14.15 has two inflow ports t19a as shown in FIG.

Among the air flowing in from both sides 19b, the air having a higher pressure flows out from the outflow port 20.

Note that if the pressure of the air from both flow holes is the same, the air from both flow holes flows to the outflow port.

In the above configuration, either the air valve 7 or 8 is opened when the transmission shift lever 9 is put into the first forward speed or reverse speed.

In this state, in order to make a sharp turn, the steering wheel 1 is rotated to a greater angle than the normal rotation angle, and when the pitman arm 3 contacts the stopper valve 5 or 6 and rotates further by pressing the stopper valve 5 or 6, the stopper valve 5 or 6 is opened, the air from the air tank 11 passes through the air valve 7 or 8, this stopper valve 5 or 6, passes through the double check valve 14 or 15, and acts on the brake chamber 12 or 13, thereby acting on the side in the direction of the turning force. The brakes on the wheels are applied.

As a result, only the brake on the inner side of the turn is applied, decelerating or stopping the rotation of the inner tire, and the vehicle makes a sharp turn to adjust the turning angle of the tire.

Furthermore, even if the brake valve 10 is operated by the brake pedal at this time, this can be used as a general braking action to slow down or stop the rotation of both tires.

That is, when the brake pedal is depressed, air flows from the air tank 11 through the brake valve 10 and the double check valve 14j15 to the brake chamber 12j13.
The brakes on both sides of the vehicle are activated.

Note that when the brakes are applied to only one side of the vehicle, even if that brake is on the drive shaft, there is a differential between the left and right wheels, so the brakes will not be applied to both tires.

During normal turning, the pitman arm 3 simply contacts the stopper valve 5 or 6, which will not open, and therefore no brakes will be applied unless the brake valve 10 is opened by the pedal.

Note that during normal driving, especially when driving at high speeds, if the brakes on one side of the vehicle are activated, the vehicle will spin, which is extremely dangerous. This prevents the stopper valve 5.6 from opening unless a strong operating force is applied to the steering wheel 1.

Furthermore, the air valve 7.8 is opened only during first forward speed and reverse, and is not opened when the vehicle is in second or higher speed.

The present invention is as described above, and includes a stopper valve 5j6 that opens when the steering wheel 1 is rotated to a normal steering angle, and a stopper valve 5j6 that opens when the steering wheel 1 is rotated to a normal steering angle, and when the transmission shift lever 9 is in the forward l speed and reverse position. A brake circuit that performs a braking action by sending air from an air tank 11 to air chambers 12 and 13 through a brake valve 10 and a circuit in which air valves 6 and 7 are connected in series so as to be opened at the same time. Since the steering system for an all-wheel drive vehicle is configured by connecting the brake valve 10 in parallel to the brake valve 10 of the brake valve 10, the pitman arm 3 can be used to adjust the turning angle of the tire by turning the steering handle 1 when driving in forward or reverse speed. The brakes on the inside of the turn can be applied automatically when the vehicle turns to a certain angle, making it possible to make sharp turns to take advantage of the tire turning angle without causing issues with interior space or link interference. can.

At this time, the vehicle speed must be in first forward speed or reverse.
Even when the brakes are applied to one side, the vehicle can be steered safely without spinning.

Furthermore, since the one-sided brake does not operate at vehicle speeds other than forward FM and reverse, there is no problem in normal driving.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a structural diagram, Fig. 2 is a sectional view showing the structure of a stopper valve and an air valve, and Fig. 3 is a sectional view showing the structure of a double check valve. be. 3 is a pitman arm, 5 and 6 are stopper valves, 7.
8 is an air valve, 9 is a transmission shift lever 110 is a brake valve, 11 is an air tank, and 12j13 is an air chamber.

Claims (1)

[Scope of utility model registration request] The stopper pulp 5.6 is designed to open when the steering wheel 1 is rotated to the normal steering angle, and the stopper pulp 5.6 is designed to open when the transmission shift lever 9 is in the forward speed and reverse position. A circuit in which air pulps 1 and 8 are connected in series is paralleled to a brake circuit flake valve 10 that performs a braking action by sending air from an air tank 11 to an air chamber 12.13 via a brake pulp 10. A steering device for an all-wheel drive vehicle characterized by being connected to.