Hydraulic power unit suitable for electrohydraulic switch machine

EP4520620A4Active Publication Date: 2025-10-22CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD
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Patent Information

Application Number
EP2023928308
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-03-21
Filing Date
2023-09-28
Publication Date
2025-10-22
Estimated Expiration
2043-09-28

AI Technical Summary

Technical Problem

However, when the electromagnetic reversing valves are used to control the oil pump, each action of the oil cylinder requires a power supply to control the reversing valves.

Benefits of technology

[0044]The pump valve assembly adopts a modular design. The various assemblies are connected by using universal interfaces, making it convenient to replace any of them. According to the present disclosure, the hydraulic control reversing valves, the hydraulic control one-way valves, the overflow valves, the oil dipstick, and the air filter are all located at an upper part of the pump valve assembly as a whole, thereby facilitating repair and replacement.

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Abstract

Disclosed is a hydraulic power unit applicable to an electro-hydraulic switch machine, including a pump valve assembly and an oil cylinder, where the pump valve assembly includes an oil pump, a first hydraulic control reversing valve, and a second hydraulic control reversing valve; the first hydraulic control reversing valve is connected between a first chamber of the oil cylinder and the oil pump through a hydraulic pipeline; the second hydraulic control reversing valve is connected between a second chamber of the oil cylinder and the oil pump through a hydraulic pipeline; when the oil pump is in a non-working state, the first chamber of the oil cylinder is in fluid connection with the second chamber of the oil cylinder through the first hydraulic control reversing valve and the second hydraulic control reversing valve, the oil cylinder is in a pressure balance state, and the electro-hydraulic switch machine can be manually operated; when the oil pump is in a first working state, the oil cylinder moves in a first direction; and when the oil pump is in a second working state, the oil cylinder moves in a second direction different from the first direction.
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Citation Information

Patent Citations

  • Railway points actuation mechanism - has four-way distributor / reverser valves between pump and actuating rams

    FR2271098A2

  • Hydraulic switch stand

    US5775647A