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US 5,012,724 AGranted
Radial piston hydraulic motor of variable cylinder capacity
OwnerBruno Giamelloinventor
Life of this patent
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Abstract
In a radial piston hydraulic motor of the "star-shaped" type the variation of the cylinder capacity is achieved by the fact that the motor crankshaft is provided with a mechanism which varies the eccentricity, this mechanism being powered by hydraulic actuators carried by the shaft and controlled by a circuit external to the frame of the motor, comprising a rotating coupling and stop valves, while stability of the cylinder capacity may be obtained by means of locking mechanisms carried on the shaft.
Claims10
A hydraulic motor, comprising:
- a housing;
- a shaft journaled in said housing;
- means in said housing forming a plurality of radial cylinders angularly spaced around said shaft;
- respective drive pistons reciprocatable in said cylinders and having inner ends turned toward said shaft;
- a ring of circular outer periphery surrounding said shaft and interposed between said shaft and said inner ends, said inner ends bearing on said ring, said ring and said shaft having confronting guide surfaces respectively along an interior of said ring and an exterior of said shaft enabling said ring to shift radially on said shaft and thereby vary an eccentricity of said outer periphery of said ring with respect to said shaft;
- piston means displaceable in said shaft and surrounded by said ring for displacing said ring radially relative to said shaft to set said eccentricity and thereby vary capacity of said cylinders;
- and
- controllable locking means releasably securing said ring to said shaft at an eccentricity set by said piston means and disengageable for resetting of said eccentricity, said controllable locking means including surfaces on said ring and said shaft automatically pressing against one another to prevent shifting of said ring by pressure of said drive pistons thereagainst, and hydraulic means for relieving pressing of said surfaces against one another to enable displacement of said ring by said piston means.
5 more elements
A hydraulic motor of a rotary type with variable cylinder capacity, comprising:
- a motor frame;
- a motor shaft journaled in said frame;
- an eccentric ring mounted on and rotationally coupled to said shaft;
- hydraulic actuators carried by the shaft;
- a rotating hydraulic coupling, caused to rotate by the shaft and connecting said actuators to a control circuit, said rotating coupling being integral with and external to the frame of the motor and connected hydraulically to the said actuators by means of elements which rotate with the shaft;
- drive pistons radially shiftable in respective drive cylinders on said frame and bearing radially on said ring for driving said shaft;
- and
- a distributor for activating said drive pistons said actuators comprising of positioning pistons which slide in corresponding positioning cylinders in said ring, said ring being fixed with respect to rotation to the shaft, this ring, when impelled by the said positioning pistons, being capable of radial displacement with respect to an axis of the shaft, guided by contact between surfaces of the said shaft and of the said ring, the said ring being radially locked with respect to the axis of the motor shaft by locking means which can be relieved in a controlled way through said rotating hydraulic coupling.
5 more elements
Dependencies are inferred from the claim text.