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Rotary hydraulic machine and controls

  • US 9,115,770 B2
  • Filed: 07/19/2011
  • Issued: 08/25/2015
  • Est. Priority Date: 02/11/2004
  • Status: Expired due to Fees
First Claim
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1. A rotary hydraulic machine comprising:

  • a casing,a rotating group located within said casing and including a plurality of variable capacity chambers defined by pistons that slide within respective cylinders, said pistons being displaceable relative to said cylinders upon rotation of said rotating group to vary volume of said chambers and induce a flow of fluid through said chambers from an inlet port to an outlet port,an adjustment assembly located within said casing and including an actuator operable upon said rotating group to adjust a stroke of said pistons and vary capacity of said machine,a fluid supply for said actuator and a control valve located within a control housing to control flow of fluid from said fluid supply to said actuator, said control valve having a position in which flow through said control valve is inhibited, said control valve being movable from said position to vary the capacity of said machine, anda controller controlling said control valve, said controller being located within said control housing and having an output to adjust said control valve and an input to receive input signals from a plurality of transducers, said transducers located within said casing and connected to said controller, said transducers providing said input signals indicative of at least one of pressure delivered at said outlet port, rotational speed of said rotating group, the capacity of said machine, and temperature of fluid in said machine,said controller utilizing said input signals of said transducers to provide a control signal to said control valve and operate upon said actuator,said fluid supply including an accumulator located in an accumulator chamber within said control housing, a supply conduit extending through said control housing from said outlet port to said accumulator, an internal conduit extending from said accumulator to said control valve, and control conduits extending from said control valve to said actuator,said accumulator having a piston and a stop extending from an end of said piston, said piston and said stop being enclosed by walls of said accumulator chamber, said piston being slideable within said accumulator chamber, said stop limiting displacement of said piston of said accumulator;

    wherein said controller is separated from said rotating group by a wall of said control housing, and wherein at least one of said transducers configured to detect rotation of said rotating group extends in part into said wall.

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