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Energy recovery and reuse methods for a hydraulic system

An energy recovery, hydraulic system technology, applied in the direction of fluid pressure actuation system components, fluid pressure actuation devices, mechanical equipment, etc., can solve the problems of pressure drop in the reservoir, difficult to operate, and the recovered liquid cannot be used.

Inactive Publication Date: 2008-07-23
HUSCO INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the load on the hydraulic actuator requires a higher pressure than the reservoir, the recovered fluid cannot be used
Likewise, hydraulic actuators are difficult to operate efficiently if they require more fluid volume than is stored in the reservoir to propel themselves
Another limiting factor is that as hydraulic actuators consume fluid from the reservoir, the pressure in the reservoir drops, reducing the ability of the remaining fluid to power the actuator

Method used

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  • Energy recovery and reuse methods for a hydraulic system
  • Energy recovery and reuse methods for a hydraulic system
  • Energy recovery and reuse methods for a hydraulic system

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Embodiment Construction

[0024] Although the present invention is described in the context of its use in an excavator, it can also be implemented on other types of hydraulic operating equipment.

[0025] First, referring to FIG. 1, the excavator 10 is composed of a cab 11 and a bracket assembly 12, wherein the cab 11 is supported by crawlers, and the bracket assembly 12 is connected with the cab to move up and down. The bracket assembly 12 is subdivided into a bracket 13, an arm 14 and a bucket 15 which are pivotally connected to each other. The bracket 13 is connected to the cab 11 and can move up and down around a pivot axis driven by a pair of hydraulic cylinder assemblies 16 and 17, wherein the hydraulic cylinder assemblies 16 and 17 are mechanically connected in parallel between the cab and the bracket. On a typical excavator, the hydraulic cylinders of components 16 and 17 are connected to the cab 11, and the piston rod is connected to the bracket 13, so the gravity acting on the bracket tends to re...

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PUM

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Abstract

A method of energy recovery and reuse in hydraulic systems, which provides several modes to recover hydraulic energy generated by overload forces acting on cylinders connected in parallel to machine components. In one mode, the liquid in the first chamber of both cylinders is sent to the reservoir, while the remaining liquid is directed into the second chamber of the cylinder. In a different mode, liquid is delivered to the reservoir from the first chamber of only one cylinder, while liquid flowing from the first chamber of the other cylinder enters the second chambers of both cylinders. Yet another mode involves transferring liquid from the first chamber of both cylinders to the second chamber of both cylinders. In yet another mode, the liquid in the first chamber of both cylinders enters the return line and the second chamber of both cylinders receives liquid from the supply line. Several modes of reusing the recovered energy are also described.

Description

[0001] Cross reference with related applications [0002] This application claims the priority of U.S. Provisional Patent Application No. 60 / 865710 filed on November 14, 2006 and U.S. Provisional Patent Application No. 60 / 913457 filed on April 23, 2007. [0003] Statement regarding federally funded research or development [0004] Not applicable Technical field [0005] The present invention relates to a hydraulic system that can control the fluid flow of a hydraulic actuator. The hydraulic actuator can move mechanical components on a machine, and particularly relates to recovering energy from the hydraulic actuator and subsequently using the recovered energy as Hydraulic actuators provide power. Background technique [0006] Construction and agricultural equipment use hydraulic systems to operate various mechanical components. For example, an excavator is a commonly used construction machine with a bracket, one end of which is pivotally connected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B21/14F15B15/00
Inventor D·B·史蒂芬森K·A·塔伯E·P·哈姆金斯J·L·普法弗
Owner HUSCO INT INC