An electro-hydraulic auxiliary braking system for reach truck load-bearing wheels and its control method

By coordinating the main pump, filling valve group, and controller of the electro-hydraulic system, automatic braking of the load-bearing wheels of the gantry reach truck is achieved, solving the problem of insufficient vehicle stability, reducing costs, and alleviating the burden of manpower.

CN120606793BActive Publication Date: 2026-06-30XUZHOU XUGONG SPECIAL CONSTR MASCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XUZHOU XUGONG SPECIAL CONSTR MASCH CO LTD
Filing Date
2025-06-25
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing gantry reach trucks suffer from insufficient vehicle stability when stationary because the load-bearing wheels are not subject to braking force, and traditional modification solutions are costly.

Method used

The system employs a main pump, a filling valve assembly, a braking main pump, and a controller to achieve automatic braking of the load-bearing wheels through an electro-hydraulic system. This system includes a lifting solenoid valve, a lowering solenoid valve, a forward/backward shifting solenoid valve, a switching valve, and a proportional directional valve. The controller automatically controls the supply and release of hydraulic oil according to the vehicle's status, thereby achieving auxiliary braking of the load-bearing wheels.

Benefits of technology

When the vehicle is parked, the load-bearing wheels are automatically braked, which enhances vehicle stability, reduces manpower, lowers costs, prevents brake overheating, and does not affect driving and emergency braking performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

A reach truck's electro-hydraulic auxiliary braking system and control method for load-bearing wheels includes a main pump and an actuator hydraulic cylinder. The two ends of the main valve are connected to a filling valve assembly, which in turn connects to the main brake pump, the slave brake pump, and an accumulator. The system also includes a controller connected to the main pump, the filling valve assembly, pressure sensor I, and pressure sensor II. Pressure sensor II is located at the oil inlet of the accumulator. This invention utilizes the main valve, the filling valve assembly, the main brake pump, and the controller in conjunction to perform auxiliary braking. When the vehicle is parked and undergoing lifting or forward / backward movement, the load-bearing wheels are automatically braked, reducing vehicle sway and enhancing vehicle stability. Furthermore, the auxiliary braking of the load-bearing wheels only activates when the forklift mast is raised, lowered, or moved forward / backward, preventing overheating of the drum brake calipers. No manual braking pedal is required during auxiliary braking, reducing the burden on the operator. Simultaneously, the system does not affect the movement of the main brake pump or the emergency braking effect when the vehicle is moving.
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