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Hydraulic system with servo pump and bypass valve

A hydraulic system and servo pump technology, applied in the direction of servo motors, servo meter circuits, fluid pressure actuators, etc., can solve problems such as high pressure peaks, hydraulic system damage, problems, etc., to achieve simple output pressure and avoid pressure peaks , The effect of saving hydraulic pressure medium pipeline

Inactive Publication Date: 2015-09-09
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For average proc speeds this doesn't really matter, but at faster proc speeds it can cause problems
For example, for an actuating signal for reducing the delivery volume flow of a servo pump, the valve plug is moved into the desired position at a higher speed than the servo pump, which has only a lower delivery volume flow due to the delay, and thus Formation of high pressure peaks which can cause damage to the hydraulic system

Method used

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  • Hydraulic system with servo pump and bypass valve
  • Hydraulic system with servo pump and bypass valve
  • Hydraulic system with servo pump and bypass valve

Examples

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Embodiment Construction

[0024] figure 1 A schematic circuit diagram of a hydraulic system 1 according to the invention is shown according to a first exemplary embodiment. The hydraulic system has two servo pumps or servo variable pumps 4 , 6 , which are driven by a drive unit 2 , and are used to supply pump pressure or output pressure to loads (not shown). The pump regulators 8, 10 are used to control the servo pumps 4, 6, respectively. In order to reduce the respective output pressure as a function of the pressure difference between the nominal pressure and the output pressure, each servo pump 4 and 6 is equipped with a comparator valve or injection valve 12 or 14 .

[0025] The design and hydraulic connections of the servo pumps 4 and 6 to the respective pump regulator 8 or 10 and to the respective comparator valve 12 or 14 are identical in terms of device technology, so for the sake of clarity the following reference is mainly made to the figure 1 The servo pump 6 shown below is used to illustra...

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PUM

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Abstract

The invention relates to a hydraulic assembly comprising at least one variable displacement pump (4, 6), which is set by a pump controller (8, 10) depending on a target pressure. The at least one variable displacement pump is used to supply at least one load with a pressure medium quantity. Furthermore, a comparison valve (12, 14) is provided, by means of which the outlet pressure is reduced to the target pressure starting at a certain pressure difference, which is to say, when the outlet pressure exceeds the target pressure by a predetermined value, the outlet pressure is lowered directly or indirectly by means of the comparison valve.

Description

technical field [0001] The invention relates to a hydraulic system according to the preamble of claim 1 . Background technique [0002] Such a hydraulic system is disclosed in DE 10 2007 035 072 A1 of the applicant. In this case, the servo pump and the control block are activated as a function of the control signal. The control signals are transmitted hydraulically or electrically from, for example, a joystick actuated by the operator via the control electronics to the control block and to the servo pump. Since the control electronics usually used in motor vehicle hydraulics have a certain processing time, and the pump regulator for controlling the servo pump also needs a certain time for regulating the servo pump due to inertia, the triggering of the servo pump There is a time delay in it. This usually results in the servo pump being activated as a control block at another point in time. For average trigger speeds this doesn't matter, but it can cause problems when trig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/05
CPCF15B2211/253F15B2211/528F15B2211/20576F15B2211/5157F15B2211/20553F15B2211/50563F15B2211/50536F15B11/055
Inventor E.赫姆斯柯克
Owner ROBERT BOSCH GMBH
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