Wet brake for tractor

Abstract

The invention relates to a brake, in particular to a wet brake for a tractor. The brake comprises a shell body, pistons, friction piece components, friction limit mechanisms and piston return mechanisms, wherein each friction limit mechanism comprises a friction positioning rod, a friction resistance ring and a first clamping spring; each friction positioning rod is provided with a first positioning shaft shoulder and a second positioning shaft shoulder from left to right; each friction positioning rod is connected with the corresponding friction resistance ring through a friction pair; each piston return mechanism comprises a pull rod and a disk spring; each pull rod is connected with the shell body in a sliding way; the right end of each pull rod is in threaded connection with the corresponding piston; the sum of the static friction between each fiction positioning rod and the corresponding friction resistance ring is greater than the sum of the maximum force of all disk springs. By the wet brake for the tractor, the dragging caused by a return gap can be overcome effectively, the service life is prolonged by over 20 percent, the automatic compensating function for the abrasion of a friction piece is provided, the return gap of each piston is kept at the range of 0.4-0.6 mm all the time, and the problems that the brake response time is long and the liquid amount required for braking is deficient caused by an over-large brake gap are avoided.

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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