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Displacement Control Device

A control device and displacement technology, applied in the direction of valve device, pump control, fluid pressure actuation device, etc., can solve the problem of unstable displacement and operation of pressure fluid unit, achieve good response and increase the effect of damping effect

Inactive Publication Date: 2022-01-14
DANFOSS POWER SOLUTIONS GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All these effects are further transmitted directly or indirectly to the control device, especially to the control spool, resulting in unstable displacement and operation of the pressure fluid unit

Method used

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Examples

Experimental program
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Embodiment Construction

[0030] figure 1 A schematic hydrostatic circuit diagram of a hydrostatic unit 50 with a two-sided displacement control device 100 is shown. The displacement control device 100 shows a symmetrically formed control cylinder 2 in which a symmetrical control spool 1 can move in two directions along the longitudinal direction 3 of the control spool or control cylinder, respectively. Charge pressure from a charge pump 30 can be supplied via two inlets 13 . The servo unit 20 for adjusting the displacement of the hydraulic unit 50 can be arranged via two servo ports 14 on one side with pressurized fluid, wherein the pressurized fluid can be discharged from the corresponding other servo side - depending on the control spool direction of movement. For example, if control spool 1 is at figure 1 Moving to the left on the plane of the control spool 1, the servo port 14 on the left side of the control spool 1 is connected to the left inlet 13. Meanwhile, the servo port 14 on the right s...

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PUM

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Abstract

A displacement control device for supplying pressurized fluid to a servo unit to adjust the displacement of a pressurized fluid unit, having a control cylinder in which a control spool is movably mounted along the longitudinal axis of the control cylinder, inlet, servo The port and the discharge port are formed longitudinally spaced apart from each other in the control cylinder, the control spool comprising: a substantially cylindrical outer surface; axis movement; a discharge area opposite the front surface; a longitudinal hole in the control spool, wherein one end of the longitudinal hole leads to the front surface and the other end is connected to the discharge area via a back pressure hole; a control recess arranged longitudinally in the outer surface; a radial hole connecting the longitudinal hole to the outer surface via a flow restricting hole, wherein the opening of the radial hole on the outer surface is positioned lateral to the control recess so that in the actuated position of the control spool, the opening of the radial hole is aligned with the The servo holes overlap, and the control recess connects the inlet with the servo port.

Description

technical field [0001] The invention relates to a displacement control device of a pressure fluid unit, which is used for providing pressurized fluid to a servo unit, and the servo unit is used for adjusting the displacement of the pressure fluid unit. The invention relates, for example, to hydrostatic propulsion units, but is not limited to such units. The invention relates in particular to an improved displacement control arrangement which provides better control and monitoring of the displacement of a pressure fluid unit. Furthermore, in particular, the present invention relates to an improved control spool for such a displacement control device. [0002] For reasons of simplification, the invention has only been described using a hydrostatic propulsion unit as an example, but the invention can also be applied to pneumatic units or the like. Background technique [0003] Especially under the control of a hydrostatic propulsion unit, the control force used to regulate th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02F16K11/07
CPCF15B13/02F16K11/0716F15B13/0402F15B13/0407F15B2211/20553F04B49/002F15B15/204F16K11/0712
Inventor 莱因哈特·汤姆斯马丁·伍斯特菲尔德苏梅尔·施尼维萨姆西
Owner DANFOSS POWER SOLUTIONS GMBH & CO
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