918,086. Reciprocating pumps; compressors. WAHLMARK, G. A. Aug. 18, 1960 [Sept. 9, 1959], No. 28655/60. Classes 8(1) and 102(1). [Also in Groups XXVI and XXIX] The swash plate 48 and cylinder block 50 of a pump or motor are connected together by a universal joint 136 and the cylinder block is pivoted by knife edges 132 on the swash plate below the axis 56, the angle of the cylinder block axis 54 being adjusted to maintain a substantially constant pressure by means of a piston 292 connectable to outlet pressure or casing pressure by a valve 290 subjected to the outlet pressure in the passage 38. The block is mounted in a carrier 118 which is secured to a cap 114 having kidney ports 206, Fig. 5 (not shown), 208 which communicate with the cylinder parts 214 and spring and pressure loaded inlet and outlet shoes 218, Fig. 5 (not shown), 220 which engage the member 216 having ports communicating with the inlet and outlet ports 36, Fig. 5 (not shown), 38 and on which the block slides. The pistons include detachable portions 158 universally jointed to the rod 154, Fig. 8. The bearing, pistons and other moving parts are lubricated by lubricant in the housing supplied and exhausted through ports 44, 46 and circulated by centrifugal action of the rotary parts.
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