The force is transmitted from the piston (14) to the connecting rod (14.1) via cylindrical, pressure lubricated reciprocating bearing. A special design feature is the bending stress relieved gudgeon pin. This design is superior to a ball connection since friction losses are lower and all moving contact surfaces have a constant velocity. Control Design: The oil flow to and from the cylinders is arranged through a flat faced distributor (4) which operates in the following manner: Control rings (6 & 15) are mounted on eccentric (38) over roller bearings (27) and, together with the body (1) form two annular passages. When oil pressure is supplied to the motor, the crankshaft (7) and eccentric (38) rotate together, allowing the control rings (6 & 15) to open the inner and outer annular passages to the oil flow. Control rings (6 & 15) are axially loaded by means of wave springs (43) to maintain constant clearance across the face of the distributor block (4) under pressure. The eccentric (38) is also axially loaded by means of the hydraulic compensator (26) and spring (42). The design ensures low friction losses, self cleaning across the distributor face, immunity from the effects of contamination and a low leakage loss. The sinusoidal opening characteristics of the distributor results in smooth and quiet running at all speeds. A two way shuttle valve (35 & 36) ensures that the inner and outer annular spaces between control rings (6 & 15) are always at the higher pressure applied to the motor. Available Options: The range is comprehensive, and the following features can be provided: 1. Choice of shafts 2. Double shaft extension 3. Motor and brake combinations 4. Geared motors; gear motor and brake combinations 5. Tachometer and other measuring attachments 6. Couplings, flanges 7. Viton seals 8. Special models for HFB and HFC non-flammable fluids 9. Direct valve assembly possible 10. Connection SAE J 518 High pressure (Typ: A1) Special custom designs on application. For information please contact jbj Techniques technical office, telephone: +44(0)1737 767493 or email: info@jbj.co.uk 2 RM 250X - RM 900X Sectional drawing / description of function www.jbj.co.uk/hydraulic-motors.html #DriveLineHarmony
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