A proportional pressure reducing valve for a truck crane

Abstract

A proportional pressure reducing valve of an autocrane comprises valve bodies, a piston assembly and a valve assembly; the valve bodies comprise an upper valve body and a lower valve body which are connected up and down; an air inlet is formed in the top of the upper valve body; the area of the front face of the piston assembly is less than that of the back face of the piston assembly; sealing rings are arranged between the piston assembly and an inner wall of the upper valve body and between the the piston assembly and an inner wall of the lower valve body; an air gap exists between the outer wall of the piston assembly between the two sealing rings and the inner walls of the valve bodies; a blowhole communicated with the air gap is formed in the valve bodies; a dust-proof device is arranged on the blowhole; air outlets and a vent are formed in the lower valve body; the vent is positioned in the lower part of the lower valve body; the valve assembly is provided with an air intake valve and an exhaust valve; the air outlets are communicated with valve body cavities; a spring seat is arranged in a lower valve body cavity in the exhaust valve; a return spring and a reset spring are arranged on a valve skeleton in a sleeving manner; and the return spring and the reset spring are opposite in rotation directions. By adopting the proportional pressure reducing valve, braking forces applied to axles with different loads of the autocrane can be guaranteed to perform matching braking in a certain proportion.

Description

technical field [0001] The utility model relates to an automobile accessory, in particular to an automobile decompression valve. Background technique [0002] There is a common problem in the field of truck cranes, that is, the load difference distributed on each axle is relatively large. When the traditional braking system is used for braking, it is easy to cause the axle with the smaller load to be locked, while the load The oversized axle has not been fully braked. At present, various OEMs use pressure reducing valves to decompress and brake axles with relatively small loads. ), so it can only ensure the coordination of the braking of each axle under the condition of the vehicle at a slow speed (at this time, because the speed is slow, the vehicle inertia is small, and the braking force required by the vehicle is not large), but in the case of high speed, because the vehicle inertia Large, the vehicle is prone to insufficient braking force of the corresponding axle. Th...

AI Technical Summary

Problems solved by technology

In addition, conventional similar products generally include air intakes, output ports, control ports, and exhaust ports, which are large in size and weight, which is not conducive to the arrangement on the vehicle

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