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Patent Searching and Data


Title:
METERLESS HYDRAULIC SYSTEM HAVING DISPLACEMENT CONTROL VALVE
Document Type and Number:
WIPO Patent Application WO/2013/036355
Kind Code:
A3
Abstract:
A hydraulic system (46) is disclosed. The hydraulic system may have a pump (50), a tank (99), a displacement actuator (134) having first and second chambers (136, 140), a regeneration valve (78), and a load-holding valve (86, 88). The hydraulic system may also have a displacement control valve (132) including a valve element (146), and a stationary cage portion (148) at least partially forming a high-pressure passage (116) fluidly connecting the pump and the valve element, a low-pressure passage (120) fluidly connecting the valve element and the tank, a first displacement actuator passage (137) fluidly connecting the valve element and the first chamber, a second displacement actuator passage (139) fluidly connecting the valve element and the second chamber, a load-holding control passage (96) fluidly connecting the valve element and the load-holding valve, and a regeneration control passage (82) fluidly connecting the valve element and the regeneration valve. The displacement control valve may also include a movable cage portion (156) that is movable to selectively restrict fluid flow through only the first and second displacement actuator passages.

Inventors:
OPDENBOSCH PATRICK (US)
KNUSSMAN MICHAEL L (US)
DIERKING JOSHUA (US)
Application Number:
US2012/050528
Publication Date:
May 23, 2013
Filing Date:
August 13, 2012
Export Citation:
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Assignee:
CATERPILLAR INC (US)
OPDENBOSCH PATRICK (US)
KNUSSMAN MICHAEL L (US)
DIERKING JOSHUA (US)
International Classes:
F15B13/02; E02F9/22; F16K11/065
Foreign References:
JPH0849659A1996-02-20
US20110030364A12011-02-10
US5205201A1993-04-27
US4359931A1982-11-23
JPH11148463A1999-06-02
Attorney, Agent or Firm:
TINKER, William, R. et al. (100 N.E. Adams Street, Peoria, IL, 61629-9510, US)
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