A kind of wet brake for tractor

Abstract

The invention relates to a brake, in particular to a wet brake for a tractor. It includes: a housing, a piston, a friction plate assembly, a friction limiting mechanism and a piston return mechanism; the friction limiting mechanism includes: a friction positioning rod, a friction resistance ring and a first clamp spring. The first positioning shoulder and the second positioning shoulder, the friction positioning rod is connected with the friction resistance ring through the friction pair; the piston return mechanism includes: a pull rod and a disc spring, the pull rod is slidingly connected with the housing, and the right end of the pull rod is threaded with the piston; all friction The sum of the static friction forces between the positioning rod and the friction resistance ring is greater than the sum of the maximum tension of all disc springs. It can effectively overcome the drag caused by the small return clearance, and the service life is increased by more than 20%. Problems with long brake response times and insufficient fluid volume required for braking.

Description

technical field [0001] The invention relates to a brake, in particular to a wet brake for a tractor. Background technique [0002] Ring-piston wet brakes are widely used on high-horsepower tractors and have the characteristics of smooth operation. Its brake is safe and reliable, anti-fading, compact structure, very suitable for working in harsh environments. Its working principle is: after the driver steps on the brake pedal, the brake fluid enters the closed area surrounded by the brake housing 1, piston 2 and sealing ring 6 from the brake fluid inlet 7 (see figure 1 ), the brake fluid pushes the piston forward, and pushes the friction plate assembly 3 to be close to the side of the transmission box to generate braking by friction. [0003] However, the piston return amount of the existing annular piston wet brake is usually between 0.15-0.25mm, and when the number of friction plates is large, the dragging between the plates is serious. In addition, if the brake does not...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly aims at the above problems, and provides a wet brake for tractors, which can effectively overcome the drag caused by the small return gap, increase the service life by more than 20%, and has the function of automatic compensation for friction plate wear, without manual adjustment. The return gap of the piston is always kept at 0.5±0.1 mm, so as to avoid the problems of long braking response time and insufficient fluid required for braking due to excessive braking gap. The technical solution is as follows:

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