| 摘要 |
1,127,809. Reciprocating pumps and motors. G. A. WAHLMARK. June 1, 1966 [June 18, 1965], No. 24336/66. Heading F1A. A pump or motor comprises a rotary cylinder block 21 carried by a yoke 69 which is tiltable or fixed relative to a drive flange 12, the block bearing on a valve plate 48 which has its high and low pressure halves canted relative to each other, so that the block seats on the high pressure half and a wedge shaped clearance is formed between the block and the low pressure half to permit escape of leakage fluid and prevent tilting of the block. Canting of the valve plate halves is produced by splitting the yoke 69 along the TDCBDC plane, machining the split faces, pivoting the halves on pins 71, and clamping the halves together with bolts 72 about a cylinder block support pin 22a, which has sufficient clearance in its yoke bore 65 for the yoke halves to cant when clamped together, valve plate 48 bending to take up the canted shape of yoke surface 47. Drive is transmitted from drive flange 12 to block 21 by a coupling 27, and the block is held against the valve plate by a ring 55. Fluid is supplied and discharged through passages in the yoke and its trunnions, Fig. 1 (not shown). Bearings 13; 14 support the drive flange 12. The valve plate 48 has relieved areas to provide pressure balancing. When the pump or motor is reversed, the block tilts to bear on the valve plate half acting as the high pressure side. |
