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Gear pump and mobile unit for adjusting conveying capacity

A mobile unit, gear pump technology, applied in the direction of pump, pump control, machine/engine, etc., can solve the problems affecting the adjustment characteristics, etc., and achieve the effect of simple function and simple switching position

Inactive Publication Date: 2012-09-19
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting pressure difference additionally influences the adjustment characteristics

Method used

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  • Gear pump and mobile unit for adjusting conveying capacity
  • Gear pump and mobile unit for adjusting conveying capacity
  • Gear pump and mobile unit for adjusting conveying capacity

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] exist figure 1 and 2 The gear pump according to the invention shown in is designed as an external gear pump as an exemplary embodiment. The gear pump has a pump casing 10 to which a cover 12 is attached. A drive shaft 14 is rotatably mounted in the cover 12 . The drive shaft 14 is connected in a rotationally fixed manner to a drive gear or drive conveyor wheel 16 , which is connected in a toothed manner to a driven gear or conveyor wheel 18 . The gear pump is provided with a displacement unit 20 for changing the delivery volume, which is movably mounted between a first pressure chamber or control chamber 22 and a second pressure chamber or control chamber 24 . A compression spring 26 acting on the displacement unit 20 is accommodated in the second control chamber 24 . It exerts a restoring force on the displacement unit 20 in the direction of the first control chamber 22 .

[0022] The mobile unit 20 is axially displaceable according to the double-headed arrow 28 a...

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Abstract

The invention refers to a gear pump especially used for an internal combustion engine, in particular an oil pump and comprising a mobile unit (20) for changing a conveying capacity. The mobile unit is configured to move between a first control cavity (22) and a second control cavity (24). According to the invention, an a / b change valve (42) is arranged, wherein a >=6 and b>=2; and a mobile piston (44) is provided. The a / b change valve (42) is connected with the gear pump in such a way that the a / b change valve (42) connects the first control cavity (22) and the second control cavity (24) with a control fluid in a pressure state at a first position b1 in a diversion connection way and connects the first control cavity (22) with the control fluid in a pressure state in a diversion connection way and connects the second control cavity (24) with an outlet (64) of the control fluid at a second position b2, wherein the first position b1 of the piston (44) and the a / b change valve (42) additionally makes the first control cavity (22) be in diversion connection with an outlet (60) of the control fluid through a flow controller (58).

Description

technical field [0001] The invention relates to a gear pump, in particular an oil pump, especially for an internal combustion engine, comprising a displacement unit for changing the delivery volume, which is movably mounted between a first control chamber and a second control chamber, wherein in the second control chamber A return spring is installed inside, which is designed to exert a force on the mobile unit in the direction of the first control chamber, wherein the mobile unit has a first control piston facing the first control chamber and a second control piston facing the second control chamber. control piston. Background technique [0002] Adjusting the oil pump mainly uses moving units, which either axially or radially reduce the displacement delivery volume. In the process, a space is created that must be filled with control oil or vented. If the ventilation does not occur quickly enough or if there is a switch position of the control unit in which the oil cannot ...

Claims

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Application Information

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IPC IPC(8): F04C2/18F04C14/18
CPCF04C14/185F04C2/14
Inventor B.克拉默M.鲁尔
Owner VOLKSWAGEN AG
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