Wet multi-disc parking brake

Abstract

The invention discloses a wet multi-disc parking brake which comprises a brake cover, a brake shell, a piston, a friction pair, a spring, a spline shaft, a sealing element and a retainer ring. The piston is mounted in a piston cylinder encircled by the brake cover and the brake shell, the piston cylinder comprises a first cylinder hole with a large diameter and a second cylinder hole with a small diameter, the piston is provided with a first sliding surface with a large diameter and a second sliding surface with a small diameter, the first sliding surface is in slide fit with the wall of the first cylinder hole, the second sliding surface is in slide fit with the wall of the second cylinder hole, the spring on the brake cover is butted to the back of the piston, the friction pair comprises friction discs and dual discs, is arranged on the outer periphery of the spline shaft and is positioned on a side of the front surface of the piston, the friction discs and the dual discs are axially alternately arranged, the brake shell is meshed with the friction discs via internal spline, the dual discs are meshed with the spline shaft via internal splines, and a high-pressure oil circuit and a lubricating oil circuit are arranged in a tank. The wet multi-disc parking brake has the advantages that the wet multi-disc parking brake is small in radial size, and dry friction among the friction discs and the dual discs can be prevented.

Description

technical field [0001] The invention relates to a brake, in particular to a wet multi-disc parking brake for off-highway mining dump trucks. Background technique [0002] With the gradual development of the mining industry, large-scale and heavy-duty mining dump trucks are the main development trend at present. The current mainstream configuration mostly uses wet service brakes and dry parking brakes. However, the dry parking brake is greatly affected by the environment, and muddy water and oil will directly affect the stability and service life of the dry brake's braking performance. Moreover, the replacement and maintenance of the friction plate are relatively complicated. And as the tonnage of the vehicle increases, the braking torque is often achieved by increasing the radial size of the brake disc or increasing the number of brakes. The former is often limited by the installation space, while the latter increases the cost. [0003] Dry parking brakes are greatly affe...

AI Technical Summary

Problems solved by technology

Moreover, the replacement and maintenance of the friction plate are relatively cumbersome.

[0004] Chinese Invention Patent CN201210109599.3 and Chinese Utility Model Patent CN201320008930.2 Difficult to get oil between the friction pairs may lead to dry friction between the friction plate and the counter plate, resulting in wear of the friction plate

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