Electrically controlled load-sensing proportioning valve

Abstract

The invention belongs to the field of wagon braking systems, and particularly relates to an electrically controlled load-sensing proportioning valve for a light-weight wagon. The electrically controlled load-sensing proportioning valve comprises a pressure sensor for realizing load sensing, a control unit for realizing proportion adjustment of front and rear braking power, a linear motor and a hydraulic valve, wherein the hydraulic valve comprises a shell and a connection rod fixedly connected with an active cell iron core; a front pressure adjustment cavity piston is fixed on one side of the connection rod; a first spring is arranged between one side, far away from the active cell iron core, of the front pressure adjustment cavity piston and the shell; a front pressure adjustment cavity is formed between the front pressure adjustment cavity piston and the shell; a middle cavity piston is fixed on the other side of the connection rod; the middle cavity piston is connected with a rear pressure adjustment cavity piston through a second spring; a second limiting check ring is arranged on the shell; the rear pressure adjustment cavity piston presses against the second limiting check ring; and a rear pressure adjustment cavity is formed between the rear pressure adjustment cavity piston and the shell. By control of the proportioning valve, the distribution characteristic of braking power of front and rear wheel brakes of a wagon is realized, and the applicability of the wagon braking system to a wagon load is improved.

Description

technical field [0001] The invention belongs to the field of truck brake systems, and in particular relates to an electronically controlled load-sensing proportional valve for light trucks. Background technique [0002] During the actual braking process of the truck, the braking force of the front and rear axles should be distributed reasonably to avoid the dangerous working condition that the rear axle is locked first. dynamic strength. For a braking system with a fixed ratio of front and rear braking forces, the actual braking force distribution curve deviates greatly from the ideal braking force distribution curve, the adhesion efficiency is low, and both front and rear wheels may slip due to locking. resulting in hazardous conditions. Load sensing proportional valve is a kind of pressure regulating valve widely used in modern trucks. Its most notable feature is that it can dynamically distribute the ratio of front and rear braking force according to the actual load, ma...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low accuracy and sensitivity of mechanical load sensing in the prior art, the present invention provides an electronically controlled load sensing proportional valve that realizes the adjustment of front and rear wheel braking forces according to the ideal distribution curve, thereby improving the braking efficiency of trucks

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