Improved work machine

The hydraulic arrangement with a CPR configuration and separate line assemblies addresses the inefficiencies in existing systems by optimizing pressure settings for multiple actuators in work machines, enhancing efficiency and reducing energy wastage.

EP4495338A1Inactive Publication Date: 2025-01-22CNH IND ITALIA SPA
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Patent Information

Application Number
EP2024189457
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-07-18
Filing Date
2024-07-18
Publication Date
2025-01-22
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing hydraulic systems for work machines like excavators are not optimized for simultaneous operation of multiple hydraulic actuators, leading to inefficiencies and energy wastage due to inability to independently adapt hydraulic fluid pressures according to load demands.

Method used

A hydraulic arrangement with a common pressure rails (CPR) configuration, featuring two separate hydraulic line assemblies connected to different actuators, allowing for optimized pressure settings and minimizing throttling losses during simultaneous operation of multiple actuators.

Benefits of technology

The proposed hydraulic arrangement optimizes rail pressures for multiple actuators, reducing throttling losses and increasing system efficiency, while also allowing for modularity and flexibility in system design, enabling smaller pumps and reduced fuel consumption.

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Abstract

A work machine (1) comprising a body, a hydraulically actuated work implement carried by the body; plurality of hydraulic actuators (4) configured to actuate the body and / or the hydraulically actuated work implement; and a hydraulic arrangement (12), which is fluidly connected to the hydraulic actuators (4); said hydraulic arrangement (12) comprising: a source of pressurized hydraulic fluid (14), to provide at outlet a flow of the pressurized hydraulic fluid; a hydraulic circuit (18) to put the source of pressurized fluid (14) in fluid communication with the hydraulic actuators (4); and control valve arrangement (40), to selectively put said hydraulic circuit (18) in fluid communication with said hydraulic actuators (4); the hydraulic circuit comprises: a first hydraulic line (20), which fluidly connects the hydraulic actuators (4) with the tank (16); a first hydraulic line assembly (21), which fluidly connects the source of pressurized hydraulic fluid (14) with at least a first among said hydraulic actuators (4); and a second hydraulic line assembly (22), which fluidly connects the source of pressurized hydraulic fluid (14) with at least a second among said hydraulic actuators (4), different from said first hydraulic actuator (4).
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Citation Information

Patent Citations

  • Hydraulic control system having energy recovery

    CN103261709A

  • Electro-hydraulic mix-drive multi-actuator loop

    CN108708423A