Abstract:
A radial cylinder hydraulic motor having continuously variable displacement capabilities comprises: oscillating hydraulic cylinders (1) which are driven to oscillate through an eccentric crankpin (2) formed on the motor shaft (3) and carrying a radially movable ring (14) adapted to be shifted along the radial direction of the crankpin by actuation of opposed counteracting hydraulic cylinders (5, 6, 7) housed within the crankpin; a hydraulic control circuit for controlling and adjusting the positions of said counteracting hydraulic cylinders in a continuous manner; an electronic control circuit adapted to control the hydraulic control circuit and process signals from at least one position sensor arranged to detect the positions of said oscillating cylinders; a rotary joint (8) for hydraulic conduits (9, 10) through which said counteracting hydraulic cylinders are controlled and adjusted; wherein the sensor (45) is an angular position sensor placed close to the oscillation axis (C) of at least one oscillating cylinder (1) to measure, based upon changes in the signal, an angular position currently entered by the cylinder liner during the swing.
Abstract:
PCT No. PCT/DE96/00313 Sec. 371 Date Sep. 25, 1996 Sec. 102(e) Date Sep. 25, 1996 PCT Filed Feb. 24, 1996 PCT Pub. No. WO96/32589 PCT Pub. Date Oct. 17, 1996A hydrostatic radial piston machine 10 is proposed, whose adjustable reciprocating ring 18 has integrated means for detecting the eccentricity 20 between the reciprocating ring 18 and the rotor 14. In combination with the rotating rotor 14 and the binding of the sliding blocks 17 to this reciprocating ring 18, the eccentric location of the reciprocating ring 18 leads to a reciprocating motion of the work pistons 16 in a radial direction. Together with the kinematic conditions in the radial piston machine 10, this leads to a change in the spacing between two successive sliding blocks 17. This change in spacing varies in proportion to the eccentricity 20 of the reciprocating ring 18 and is therefore detected by a measuring instrument. To that end, this measuring instrument has a measured value pickup 27, which is integrated in the reciprocating ring 18 and outputs an increased voltage signal as long as sliding blocks 17, which act as measured value transducers, move past it. The signal course is delivered to an electronic evaluation unit 28 and used by it to determine eccentricity, rotor rpm, and other characteristic variables.