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Hydraulic system

A technology of hydraulic system and hydraulic pump, applied in the field of hydraulic system

Inactive Publication Date: 2013-10-30
J C BAMFORD EXCAVATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] For example, since the cessation of operation of one actuator can have a significant effect on the pressure of the hydraulic fluid in the hydraulic system, and thus on the operation of other actuators, it is difficult to distribute among multiple control valves and associated actuators. hydraulic fluid

Method used

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Examples

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Embodiment Construction

[0079] refer to figure 1 , which shows a working machine 10 .

[0080] Working machine 10 can be as figure 1 machine shown generally in ; however, it should be understood that embodiments of the invention may be used in connection with other types of work machines, and figure 1 The machines shown are shown as examples only.

[0081] Work machine 10 includes a body 12 which may include a cab 14 mounted thereon. The main body 12 of the machine is provided with an engine 16 . The main body 12 may include a ground engaging device 18 . The ground engaging means may, for example, include a plurality of wheels mounted on a plurality of axles and / or may include one or more tracks. The ground engaging device 18 is coupled to the engine 16; the engine 16 is configured to drive the ground engaging device 18 relative to the ground surface to cause movement of the body across the ground surface.

[0082] Work machine 10 may include one or more work arms 20 to which work tools or impl...

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PUM

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Abstract

A method of operating a hydraulic system including providing a hydraulic pump (32,232,332) having a pump outlet, a main orifice (43,243A,243B) having a main orifice inlet in fluid communication with the pump outlet and a main orifice outlet for supplying pressurised fluid to a service, a flow orifice (44,244,344) having a flow orifice inlet for sensing a pressure representative of a pressure at the pump outlet and a flow orifice outlet, an amplification orifice (45,245,345) having an amplification orifice inlet in fluid communication with the flow orifice outlet and an amplification orifice outlet for sensing a pressure representative of a pressure at a service, means (63,263,363) for generating an output signal representative of a fluid pressure between the flow orifice outlet and the amplification orifice inlet, and a pump controller (64,270,395) for controlling the hydraulic pump in response to the output signal, the flow orifice defining a flow orifice cross section area and the amplification orifice defining an amplification orifice cross section area, the flow orifice cross section area and the amplification orifice cross section area defining a ratio, in which the main orifice is variable and the ratio is variable, the method further comprising the steps of operating the system in a first mode so as to define a first mode ratio and operating the system in a second mode so as to define a second mode ratio, so that the ratio is controlled differently in the first mode and the second mode.

Description

technical field [0001] The invention relates to a hydraulic system, in particular to a hydraulic system used on a working machine. Background technique [0002] A typical working machine may include a hydraulic system having a hydraulic pump and one or more hydraulically operable devices (eg, actuators) coupled to the hydraulic pump. One or more control valves are used to control the supply of hydraulic fluid from the hydraulic pump to the or each actuator. Accordingly, an operator may use the control interface to control operation of one or more control valves to cause actuation of one or more actuators. [0003] These actuators may be coupled to various parts of the working machine. For example, actuation of an actuator may cause movement of a working arm of a working machine. [0004] The purpose of known load sensing hydraulic systems is to maintain a constant flow for a given position of a control valve, especially a spool of a directional control spool valve. This ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/10
CPCF15B2211/40507F04B49/00F15B11/165F15B2211/20546F15B2211/20538F15B2211/40515F15B2211/253F15B11/168F15B2211/50536F15B2211/6051F15B2211/6058F15B2211/651F15B2211/653E02F9/2264E02F9/2296F15B11/02F15B13/02
Inventor 哈里什·纳罗汉姆
Owner J C BAMFORD EXCAVATORS LTD