Automatic pressure relief valve for travel motor and travel motor

By employing an automatic pressure relief valve in the travel motor, and utilizing a centering structure and pressure control at both ends to control movement, the connection and disconnection between the brake piston chamber and the return oil passage are achieved. This solves the problem of pressure unloading in the brake piston chamber, simplifies the oil circuit structure, reduces costs, and ensures the safety and maintainability of the travel motor.

CN115949639BActive Publication Date: 2026-05-26JIANGSU ADVANCED CONSTR MASCH INNOVATION CENT LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU ADVANCED CONSTR MASCH INNOVATION CENT LTD
Filing Date
2022-12-30
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

When the existing travel motor switches to the parking state, the pressure in the brake piston chamber cannot be unloaded in time, causing the brake piston to separate from the friction pads. This results in insufficient braking torque, which can easily lead to a rollover accident. Furthermore, the hydraulic circuit structure is complex and costly.

Method used

An automatic pressure relief valve is adopted, which controls the movement of the brake piston chamber and the return oil passage through the centering structure and the pressure at both ends, simplifying the oil circuit structure. The slide valve structure facilitates disassembly and maintenance.

Benefits of technology

It realizes the on/off control of the brake piston chamber when the travel motor is working, ensuring the normal operation of the travel motor, providing sufficient braking torque when the vehicle is stopped, reducing the risk of slippage, simplifying the oil circuit structure, and reducing production and maintenance costs.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN115949639B_ABST
    Figure CN115949639B_ABST
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Abstract

This invention relates to an automatic pressure relief valve for a travel motor, comprising a first limiting plug, a first spring, an automatic pressure relief valve core, a second spring, and a second limiting plug coaxially and sequentially arranged within a mounting cavity. A first spring cavity is formed between the first limiting plug and the end of the automatic pressure relief valve core, and a second spring cavity is formed between the second limiting plug and the end of the automatic pressure relief valve core. The outer wall of the automatic pressure relief valve core has an axially extending communicating groove. When the automatic pressure relief valve core is in a non-neutral position, the third oil passage and the return oil passage are not connected. The balance valve and the automatic pressure relief valve in the travel motor work together to control the opening or closing of the brake piston cavity and the return oil passage, achieving separation or compression between the brake piston and the friction plate to match the working state of the travel motor. This structural design is sensitive and responsive. The automatic pressure relief valve and the balance valve work together to control the opening and closing of the brake piston cavity and the return oil passage, thereby matching the motor's working state.
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