Pneumatic parking brake

Abstract

The invention belongs to the field of engineering machinery, and in particular, relates to a parking brake. A brake wheel is arranged on a brake shaft; the brake shaft can move in the axial directionof the brake wheel; a brake shell and a piston shell are fixed through a bolt; a brake module for limiting rotation of the brake wheel is arranged between the brake shell and the piston shell; a flange plate is fixed on the end surface, near the side of the brake shell, of the brake shaft; a spring base is fixed on the piston shell; a piston sleeves the brake shaft, and can axially move between the piston shell and the spring base; a clutch spring set for pushing the piston to move to the side of the flange plate sleeves the spring base; the piston shell is provided with an intake port passingto an axial gap between the piston shell and the piston; and a tooth form cooperating with a shaft end surface of an axle rim transmission shaft is arranged on the outer end surface of the flange plate. No or less wear and heat are generated between friction plates, so that cooling and lubrication are not needed; and as the friction plates are not directly acted on, pressure for relieving brakingis lower, and gas source power is adopted to achieve energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the field of engineering machinery, and in particular relates to a parking brake. Background technique [0002] At present, most of the parking brakes are installed between the transmission case and the drive axle, and are used individually; through the force generated by the spring group, the friction plate is pressed to realize the parking brake; hydraulic oil is pressed into the brake cylinder to push the piston further The spring is compressed so that there is a gap between the friction plates to move relative to each other, so as to realize the parking release, that is, when the vehicle is moving, the friction plates are always moving relative to each other, and each friction plate is always rubbing against each other, which will generate more heat. ; Therefore, wet brakes are often used, and seals are installed on the brakes, and gear oil is used to lubricate and cool down the friction plates to prevent overheating and si...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the parking brakes are installed between the transmission case and the drive axle, and are used individually; through the force generated by the spring group, the friction plate is pressed to realize the parking brake; hydraulic oil is pressed into the brake cylinder to push the piston further The spring is compressed so that there is a gap between the friction plates to move relative to each other, so as to realize the parking release, that is, when the vehicle is moving, the friction plates are always moving relative to each other, and each friction plate is always rubbing against each other, which will generate more heat. ; Therefore, wet brakes are often used, and seals are installed on the brakes, and gear oil is used to lubricate and cool down the friction plates to prevent overheating and sintering of the friction plates; while the friction coefficient between the friction plates of wet brakes is relatively low, in order to have enough parking torque, it is necessary to More sets of friction plates and more sets of springs; more friction plates will generate more heat, which is harmful to brake heat dissipation and brake seals; more spring sets require a comparison of brake release pressure If the piston ring area is large, the parking brake can only be released by hydraulic pressure; if the seal is not tight, oil leakage will occur and pollute the environment

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