Radial-piston hydraulic motor and method for regulation of a radial-piston hydraulic motor
AssigneeValmet Voimansiirto Oy
InventorMauno Leinonen
Life of this patent
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Abstract
A radial-piston hydraulic motor and method for regulating a radial-piston hydraulic motor including one or more cylinder groups, each cylinder group having piston mechanisms that move radially back and forth. The piston mechanisms include a piston and a press wheel. The volume per revolution of the motor can be changed in one or more stages so that the press wheels of one or more of the piston mechanisms come out of contact with a cam ring. The hydraulic motor also includes a closing valve for closing the flow of working pressure to one or more of the piston mechanisms.
Claims12
A radial-piston hydraulic motor, comprising
- a central shaft;
- at least one cylinder group, each of said at least one cylinder group comprising
- a cylinder frame including a plurality of radially oriented recesses and arranged in a stationary position in connection with said shaft;
- a box frame rotatably mounted to said cylinder frame,
- a cam ring having an inner, wave-shaped face arranged in connection with said box frame,
- piston mechanisms having a piston and a press wheel and arranged in said recesses in said cylinder frame such that a piston space is defined between said cylinder frame and each of said pistons, and
- conduit means for passing hydraulic fluid into said piston spaces such that said pistons are pressable against said wave-shaped face of said cam ring to cause said cam ring to revolve in relation to said at least one cylinder group;
- a distributor valve connected to said box frame for controlling flow of the hydraulic fluid to and from said piston spaces via said conduit means in order to selectively displace at least some of said pistons in a power stage outward against said cam ring causing said cam ring to rotate while enabling other of said pistons in a return stage to be displaced inward,
- a set of ducts arranged in said cylinder frame for passing the hydraulic fluid to said distributor valve,
- a closing valve arranged in said cylinder frame and interposed between said distributor valve and at least one of said piston spaces, said closing valve including a movable spindle structured and arranged to control the flow of hydraulic fluid to said at least one piston space independent of the flow of hydraulic fluid to other of said piston spaces, and
- connecting means for fluidly connecting said distributor valve to said closing valve such the hydraulic fluid flows from said distributor valve through said closing valve to said at least one piston space.
A method for regulating a radial-piston hydraulic motor including a central shaft and at least one cylinder group, each of said at least one cylinder group comprising a cylinder frame including a plurality of radially oriented recesses and arranged in a stationary position in connection with said shaft, a box frame rotatably mounted to said cylinder frame, a cam ring having an inner, wave-shaped face arranged in connection with said box frame, piston mechanisms having a piston and a press wheel and arranged in said recesses in said cylinder frame such that a piston space is defined between said cylinder frame and each of said pistons, and conduit means for passing hydraulic fluid into said piston spaces such that said pistons are pressable against said wave-shaped face of said cam ring to cause said cam ring to revolve in relation to said at least one cylinder group, the improvement comprising the steps of:
- connecting a distributor valve to said box frame for controlling flow of the hydraulic fluid to and from said piston spaces via said conduit means in order to selectively displace at least some of said pistons in a power stage outward against said cam ring causing said cam ring to rotate while enabling other of said pistons in a return stage to be displaced inward,
- arranging a set of ducts in said cylinder frame for passing the hydraulic fluid to said distributor valve,
- arranging a closing valve in said cylinder frame between said distributor valve and at least one of said piston spaces, said closing valve including a movable spindle structured and arranged to control the flow of hydraulic fluid to said at least one piston space independent of the flow of hydraulic fluid to other of said piston spaces, and
- fluidly connecting said distributor valve to said closing valve such the hydraulic fluid flows from said distributor valve through said closing valve to said at least one piston space.
Dependencies are inferred from the claim text.