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Electro-hydraulic system for controlling multiple functions

A technology of electro-hydraulic and directional control valves, which is applied in the direction of servo meter circuits, servo motors, servo motor components, etc., and can solve problems such as high loss of priority circuits

Active Publication Date: 2014-04-09
PARKER HANNIFIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Priority function flow from a separate pump needs to be sized for engine idle conditions, resulting in higher losses in the priority circuit at higher engine speeds

Method used

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  • Electro-hydraulic system for controlling multiple functions
  • Electro-hydraulic system for controlling multiple functions
  • Electro-hydraulic system for controlling multiple functions

Examples

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Embodiment Construction

[0029] Referring now in more detail to the accompanying drawings, figure 1A first preferred embodiment of the invention is shown comprising an electrohydraulic system 10 . The system 10 is disposed on a motion-enabled device, such as a mobile device (not shown), to control a number of motion functions as described below. The mobile equipment in the preferred embodiment is a tractor, and the system 10 is optionally provided on other types of equipment. The system 10 includes a hydraulic pump 20 rotatably driven by a prime mover (not shown), such as an internal combustion engine of the plant. System 10 also includes electronic controller 30 , load sensing directional control valve 40 , multiple linear or rotary hydraulic motor 50 , load sensing relief valve 60 , margin relief valve 70 , and hydraulic accumulator 80 .

[0030] The hydraulic pump 20 is preferably a variable displacement pump with an electro-hydraulic pump control 21 configured such that the pumped fluid output d...

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PUM

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Abstract

Electro-hydraulic systems (10, 110, 210, 310, 410, 510, 610 and 710) control multiple hydraulic motors without objectionable erratic or jerky motion. The system (10) includes a variable displacement pump (20), an electronic controller (30), a direction control valve (40), first and second pump outlet valves (60) and (70), and a fluid reservoir (80). The pump (20) does not require or use a load feedback signal to control pump output. The controller (30) provides electric control signals to a pump control (21) and to individual hydraulic motors (51). A load sense circuit (46) resolves a highest load sense pressure Ps, which is communicated to the first and second pump outlet valves (60) and (70). The first pump outlet valve (60) limits the maximum load sense pressure. The second pump outlet valve (70) limits the maximum pressure differential between the pump outlet and the load sense pressure.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application 61 / 453,644, filed March 17, 2011, and U.S. Provisional Patent Application 61 / 453,686, filed March 17, 2011, the disclosures of which are incorporated herein by reference in their entirety . technical field [0003] The present invention relates to electro-hydraulic systems. In particular, the invention relates to electrohydraulic systems for controlling multiple functions. Background technique [0004] Electrohydraulic systems are widely used to control multiple functions in various types of equipment. For example, electrohydraulic systems are widely used to control the multiple motion functions of mobile equipment such as farm equipment, construction equipment, loading equipment, and lifting equipment. [0005] A prior art electro-hydraulic system for such mobile equipment includes a hydraulic pump and a plurality of hydraulic motors (such as, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/16
CPCF15B2211/6346F15B11/165F15B2211/50536F15B2211/253F15B13/022F15B2211/85F15B2211/6652F15B2211/20546F15B2211/6055F15B2211/57F15B11/162E02F9/22F15B11/02F15B11/16
Inventor 吉尔马诺·弗兰佐尼加尔默·哈希亚罗杰·洛曼
Owner PARKER HANNIFIN CORP