Electrically Operated Pressure Regulating Valves for Adjustable Hydrostatic Pumps

A technology of pressure regulation and hydrostatic pumps, which is applied to components of pumping devices for elastic fluids, electric fluid pressure control, fluid pressure actuation devices, etc., can solve the problems of high expenditure and structural space requirements, and achieve Effect of reduced expenditure and structural space requirements, reduced consumption

Active Publication Date: 2018-12-14
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The last-mentioned electrically actuated pressure control valve arrangement has the disadvantage of high technical outlay and installation space requirements, since it involves a combination of the main pressure control valve and an additional electrically actuated pilot control valve

Method used

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  • Electrically Operated Pressure Regulating Valves for Adjustable Hydrostatic Pumps
  • Electrically Operated Pressure Regulating Valves for Adjustable Hydrostatic Pumps
  • Electrically Operated Pressure Regulating Valves for Adjustable Hydrostatic Pumps

Examples

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Embodiment Construction

[0030] figure 1 A circuit diagram is shown of an exemplary embodiment of a directly controlled pressure regulating valve 1 according to the invention for supplying the regulating cylinder 2 of an axial piston pump 4 with adjustable static pressure. For this purpose, an actuating pressure connection A arranged on the valve housing 6 is connected via a control pressure line 8 to an actuating pressure chamber 10 of the actuating cylinder 2 . Filling the adjusting pressure chamber 10 with adjusting pressure medium causes the adjusting piston 12 to move against the force of the adjusting spring 14 , thereby reducing the delivery quantity of the axial piston pump 4 and thus indirectly reducing the operating pressure of the dispersive axial piston pump.

[0031] The axial piston pump 4 is driven via a drive shaft 16 and delivers pressure medium from a tank T into a working line 18 . Via the control and regulation pressure channel 20 , the working line 18 is connected to the pump con...

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Abstract

An electroproportional pressure control valve of cartridge-type construction is screwed into a housing bore of a hydrostatic pump. The cartridge includes an adjusting pressure port, a pump port, and a tank port. The adjusting pressure port is relieved to the tank port in a normal position of a spring-biased valve plunger of the pressure control valve. A connection from the pump port to the adjusting pressure port is opened counter to the force of the spring by increasing a current of an electromagnet and increasing the pump pressure at the pump port. The spring, the electromagnet, and the resultant force of the pump pressure act along a common axis of movement of the valve plunger. A first nozzle connects the adjusting pressure port to an adjusting pressure chamber. A second nozzle connects the adjusting pressure port to the tank port.

Description

technical field [0001] The invention relates to an electrically actuated pressure regulating valve for an adjustable hydrostatic pump and to a hydrostatic pump with such a pressure regulating valve. Background technique [0002] The adjustment of the delivery rate of the hydrostatic pump can be effected by means of an adjusting pressure medium which is applied and filled, for example, into the adjusting cylinder of the pivot rocker of the axial piston pump. The regulating valve here controls the connection of the regulating pressure medium source to the regulating cylinder. [0003] As feedback for the (achieved) adjustment of the regulating valve, it is known from the prior art on the basis of a first principle to provide a stroke feedback or force feedback of an adjusting device (for example an adjusting cylinder) for the regulating valve. As a result, when the regulation increases and thus when the delivery quantity of the pump increases, the regulating valve is influenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/044F04B53/10G05D16/20
CPCF04B1/328F04B53/10F15B13/044G05D16/20F04B53/109F16K31/0613Y10T137/7925Y10T137/86622Y10T137/86702F04B1/324F04B27/1804
Inventor J·奥芬布格尔C·迪博尔德F·诺尔特
Owner ROBERT BOSCH GMBH
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