JPS6082471A - Braking force controller for vehicle - Google Patents

Abstract

PURPOSE:To control braking force in an air suspension car according to its loading capacity, by making hydraulic pressure inside an air bellows of a suspension act on a pressure responsive device, while controlling a load sensing valve with actuation of a load sensing valve. CONSTITUTION:A pressure responsive device 9 is coupled with a lever 8 of a load sensing valve 4. Then, an air bellows 1 of an air suspension is linked up with the pressure responsive device 9 with an air pressure pipe 10. With this constitution, the pressure responsive device 9 is set in motion with hydraulic pressure in the air bellows 1, controlling the load sensing valve 4 according to its loading capacity.

Description

[Detailed description of the invention] The present invention relates to a braking force control device for a vehicle.

The weight difference between empty and loaded trucks and buses varies greatly depending on the number of passengers, and there is a particularly significant difference in the load applied to the rear wheels. Normally, an appropriate braking force is designed according to the weight of the loaded vehicle, but when the vehicle is empty, excessive braking is applied, making the rear wheels particularly likely to lock. In order to prevent this, it is known that a load sensing valve is installed which controls the air pressure or hydraulic pressure of the rear wheel braking device according to the weight of the loaded vehicle to provide an appropriate braking force. This load sensing valve controls the amount of displacement of the rear axle relative to the frame using a lever.

However, some vehicle suspensions use air bellows, but in this case, the distance between the rear axle and the frame is constant regardless of the load, so there is a problem that conventional methods cannot control braking mold. be.

Nowadays, many vehicles equipped with air suspensions are being produced to improve ride comfort, and there is a demand for air suspension vehicles to be able to control the braking force in accordance with the weight of the vehicle loaded.

In response to the above-mentioned requirements, the present invention makes it possible to control the braking force by using a load sensing bar /l/7'' without changing the design of the conventional piping configuration in air suspension vehicles.

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is an air bellows that is partially suspended from the vehicle body, and is connected to an air tank via a leveling pulp 2 and a surge tank 3, and a leveling valve 2 opens and closes depending on the loaded vehicle weight iK to supply the required air pressure. It is designed to be supplied to bellows 1. The present invention provides a load sensing pulp 4 in a vehicle whose body is suspended by such an air bellows 1. This load sensing valve 4 is operated in the same manner as before by controlling the lever 8 to control the signal pressure 'f' from the brake valve 5 to the IJ cylinder valve 6, and to control the braking air pressure sent from the air tank to the brake chamber 7. This controls the braking force to an appropriate level according to the weight of the vehicle.

A pressure response device 9 is connected to the lever 8 of the load sensing valve 4, and the air pressure supply path between the surge tank 3 and the air bellows 1 in the air bellows 1 and the pressure response device 9 are connected to the air pressure conduit 10. It is linked together.

As shown in FIG. 2, the pressure response device 9 includes a diaphragm 1 equipped with a return spring 13 in an air chamber.
1Z is provided, and the actuating rod 12 connected to this diaphragm 11 is connected to the lever 8 of the load sensing pulp 4. Alternatively, as shown in FIG. A suitable structure is that the piston rod 12α integrated with the piston 14 is connected to the lever 8 of the velvet sensing pulp 4.

According to the present invention, the air bellows 1
The pressure fluctuations in the air pressure inside are applied to the pressure response device 9 through the air pressure conduit 10, and the lever 8 is actuated to appropriately control the rear wheel braking force by the load sensing valve 4 depending on the loaded state of the vehicle. . Therefore, it is now possible to control the braking force when an air suspension vehicle is empty or loaded, which was not possible in the past.Moreover, the load sensing valve is similar to the Leno (one-piece control structure) used in Leafs Flink suspension vehicles. Use as is''5''
It has the advantage of being easy to put into practical use.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of the device of the present invention, FIG. 2 is a cross-sectional view of the main part of the present invention, and FIG. 3 is a cross-sectional view showing another example 1 of the pressure-responsive device. 1...Air bellows, 4...Load sensing pulp, 8. #, Shire, 900. Pressure response device, 10...
・Air pressure conduit. Figure 3

Claims (1)

[Claims] In a vehicle suspended by air bellows, a load sensing valve is installed to control the fluid pressure that operates the rear wheel braking device, and a pressure responsive device is installed on the lever for opening/closing control provided on this load sensing valve. A braking force control device for a vehicle, characterized in that the air pressure supply path of the air bellows is connected to the pressure response device by an air pressure conduit.