Adjusting device used for fluid static force pump and fluid static force pump

A technology for adjusting equipment and hydrostatic force, applied in mechanical equipment, pumps, pump control, etc., can solve problems such as reducing pump efficiency
CN103671058AActive Publication Date: 2014-03-26ROBERT BOSCH GMBH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ROBERT BOSCH GMBH
Publication Date
2014-03-26

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Abstract

The invention discloses an adjusting device used for adjusting discharge volume of the fluid static force pump and provided with a power adjusting valve. The power adjusting valve is provided with a first port, a second port, a third port and a valve slide block. Hydraulic pressure oil can flow into the first port from a pressure port of the pump. The second port can be connected with an oil tank. The third port is connected with a servo cavity in a servo piston. The valve slide block can be loaded through controlling pressure in a condition when the discharge volume of the pump is decreased and the valve slide block can be loaded with a spring device in a condition that a swing angle is increased. The invention aim at adjusting different power levels by arranging the adjusting device adopting the above structure. The device is realized by that the valve device can load control pressure that is amount to pressure in a pressure port of the pump or can load control pressure decreasing relative to pressure in the pressure port of the pump based on adjustment of the valve slide block of the power adjusting valve.
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Description

technical field

[0001] The invention relates to an adjusting device which is provided for adjusting the displacement of an adjustable hydrostatic pump and which has the features stated in the preamble of claim 1 . Background technique

[0002] The hydrostatic pump can, for example, be a regulating pump of axial piston design, wherein the oil supply quantity is adjusted by changing the swivel angle of the swash plate. The basic structure of a control device for an electro-proportional swivel angle control of a control pump is known from document DE 10 2008 038 435 A1. In this case, the swash plate is acted upon by the servo piston of the servo cylinder in the direction of increasing pivot angle and by the counterpiston of the counter cylinder in the direction of decreasing pivot angle. The counter-piston is always subjected to high pressure, while an electrically controlled proportional control valve of the servo chamber of the servo cylinder can deliver hydraulic oil or dis...

Claims

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