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Patent Searching and Data


Title:
TORQUE CONTROL FOR OPEN CIRCUIT PISTON PUMP
Document Type and Number:
WIPO Patent Application WO/2012/088451
Kind Code:
A3
Abstract:
A pump control system and a torque control valve are disclosed. In one embodiment, the torque control valve includes a sleeve, a spool disposed in the sleeve, and a piston rod disposed through the spool. The spool has a first recess area, a second recess area, and a third recess area. The first and third recess areas each have a port extending into a central bore of the spool. The piston rod includes a groove orifice feature having a spiral groove and is configured such that a fluid flowing from the port in the first recess area to the port in the third recess area must flow through at least a portion of the spiral groove. The fluid flowing through the spiral groove operates to bias the spool in a direction towards the second axial end of the spool.

Inventors:
WANG SHU (US)
Application Number:
PCT/US2011/066925
Publication Date:
April 25, 2013
Filing Date:
December 22, 2011
Export Citation:
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Assignee:
EATON CORP (US)
WANG SHU (US)
International Classes:
F04B1/14; F03C1/06; F04B1/20; F04B49/12; F04B49/22
Foreign References:
US20100236399A12010-09-23
EP1645502A22006-04-12
US6095760A2000-08-01
US5486097A1996-01-23
US2874542A1959-02-24
Attorney, Agent or Firm:
BRUESS, Steven, C. (P.O. Box 2903Minneapolis, MN, US)
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