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Patent Searching and Data


Title:
MULTIPLE FUNCTION HYDRAULIC SYSTEM WITH A VARIABLE DISPLACEMENT PUMP AND A HYDROSTATIC PUMP-MOTOR
Document Type and Number:
WIPO Patent Application WO/2012/125792
Kind Code:
A3
Abstract:
A hydraulic system includes a first pump and a plurality of valves that control fluid flow from the first pump to several actuators. Variable source orifices in the control valves are connected in parallel between the first pump and a node, and variable bypass orifices in the control valves are connected in series between the node and a tank. Pressure at the node controls displacement of the first pump. Each control valve also has a metering orifice for varying fluid flow between the node and one of the actuators. A hydrostatic pump-motor, coupled between two ports of a given actuator, is driven in a motoring mode by fluid exiting one of those ports. In a pumping mode, the hydrostatic pump-motor forces lower pressure fluid exhausting from one port into the other port of the given actuator.

Inventors:
PFAFF, Joseph, L. (9004 Jackson Park Blvd, Wauwatosa, WI, 53226, US)
HAMKINS, Eric, P. (2606 Wensley Court, Waukesha, WI, 53188, US)
Application Number:
US2012/029175
Publication Date:
May 01, 2014
Filing Date:
March 15, 2012
Export Citation:
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Assignee:
HUSCO INTERNATIONAL, INC. (2239 Pewaukee Road, Waukesha, WI, 53187-0257, US)
PFAFF, Joseph, L. (9004 Jackson Park Blvd, Wauwatosa, WI, 53226, US)
HAMKINS, Eric, P. (2606 Wensley Court, Waukesha, WI, 53188, US)
International Classes:
F16D31/02
Foreign References:
US20110056192A12011-03-10
US7290389B22007-11-06
US20100236232A12010-09-23
Attorney, Agent or Firm:
HAAS, George, E. (Quarles & Brady LLP, 411 East Wisconsin AvenueMilwaukee, WI, 53202, US)
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