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Hydraulic controls with load pressure reduction

A technology of control device and pressure, applied in fluid pressure actuation device, fluid pressure actuation system test, mechanical equipment, etc., can solve the problems of load signal line leakage, reduce power, hinder the full utilization of pump power, etc., to achieve design simple effect

Active Publication Date: 2017-11-07
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this solution is also: there is still the problem of permanent leakage flow caused by the load signal line, this leakage flow has to be compensated by the hydraulic pump
This prevents full utilization of the pump power and reduces the power

Method used

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  • Hydraulic controls with load pressure reduction
  • Hydraulic controls with load pressure reduction
  • Hydraulic controls with load pressure reduction

Examples

Experimental program
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Effect test

Embodiment Construction

[0084] according to figure 1, the hydraulic control unit 1 of the compact excavator has a hydraulic pump 2 with an adjustable delivery volume. The preparation line 4 through the hydraulic pump 2 can feed several hydraulic consumers (see image 3 ) to provide the pressure medium. according to figure 1 , of these hydraulic consumers only the first hydraulic consumer 6 is shown, which is formed by a synchronized cylinder with a one-sided piston rod for actuating the boom of the micro-excavator. In order to actuate the first hydraulic consumer 6 , a control valve 8 is assigned to said consumer. In this case, the control valve 8 is designed as a 6 / 3 proportional directional valve (6 / 3 proportional directional valve) with a spring-centered blocking position. The control valve 8 is connected via a working line 10 to the auxiliary line 4 of the hydraulic pump 2 and via working lines 12 , 14 to the working chambers 16 , 18 of the first hydraulic consumer 6 . For actuating the cont...

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PUM

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Abstract

The invention discloses a hydraulic control device with an adjustable hydraulic pump, via which at least one hydraulic consumer can be supplied with pressure medium. The control device has a pump regulator by means of which the control volume flow of the regulating device of the hydraulic pump can be adjusted as a function of the standby line pressure of the hydraulic pump and the maximum load pressure of the hydraulic consumer. In addition, the hydraulic control unit has a pressure reduction device for the highest load pressure. In this case, the pressure reduction device can be adjusted as a function of the adjusted volume flow of the adjustment device.

Description

technical field [0001] The invention relates to a hydraulic control device with a load pressure reducing device. Background technique [0002] In working machines, especially in the case of mobile and compact designs such as compact or mini excavators, backhoe loaders or telescopic loaders, hydraulic pumps preferably provide an adjustable delivery to hydraulic consumers volume. In this case, the volume flow is distributed via control valves which must ensure a harmonious movement sequence even when operating several consumers. In load-sensing systems, the regulation of the delivery volume flow of the hydraulic pump is done via a pump regulator, which communicates to the pump on the one hand the highest load pressure of the consumer and, on the other hand, the ready line pressure of the hydraulic pump Regulator. In order to distribute the pressure medium to the hydraulic consumers (LUDV) depending on the load pressure, individual pressure scales are respectively arranged d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/16F15B13/06
CPCE02F3/325E02F9/2232E02F9/2285E02F9/2296F15B11/165F15B2211/20553F15B2211/605F15B2211/654E02F9/22F15B5/00F15B19/00
Inventor W.考斯
Owner ROBERT BOSCH GMBH
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