SWASH PLATE TYPE PISTON PUMP MOTOR

PROBLEM TO BE SOLVED: To provide a swash plate type piston pump motor that can prevent floating of a shoe during high speed rotation and suppress decline in pump efficiency during low speed rotation.SOLUTION: A swash plate type piston pump motor 100 includes: a retainer holder 50 slidably fitted to a rotating shaft 1 and having one end coming into sliding contact with a retainer 40; an energizing member 60 for energizing the retainer holder 50 on the retainer side; an annular recessed portion 15 that is formed in a cylinder block 10 to surround the outer periphery of the rotating shaft 1 and to which the other end side of the retainer holder 50 is inserted; and a movable member 80 that abuts on both of a bottom surface 15A of the annular recessed portion 15 and the other end surface 52 of the retainer holder 50 and is movable in the radial direction within the annular recessed portion 15 by using centrifugal force caused by the rotation of the cylinder block 10. Conversion portion 52, 15A for converting the force of the movable member 80 toward the radial outer side to the energizing force for energizing the retainer holder 50 on the retainer side are formed at least one of the retainer holder 50 and the annular recessed portion 15. 【課題】高速回転時のシューの浮き上がりを防止でき、かつ低速回転時のポンプ効率の低下を抑制できる斜板式ピストンポンプ・モータを提供する。【解決手段】斜板式ピストンポンプ・モータ１００は、回転軸１に摺動可能に装着され、一端がリテーナ４０に摺接するリテーナホルダ５０と、リテーナホルダ５０をリテーナ側に付勢する付勢部材６０と、回転軸１の外周を取り囲むようにシリンダブロック１０に形成され、リテーナホルダ５０の他端側が挿入される環状凹部１５と、環状凹部１５の底面１５Ａとリテーナホルダ５０の他端面５２の両方に当接し、シリンダブロック１０の回転に伴う遠心力によって環状凹部１５内を径方向に移動可能な可動部材８０と、を備える。リテーナホルダ５０及び環状凹部１５の少なくとも一方には、可動部材８０が径方向外側に向かう力を、リテーナホルダ５０をリテーナ側に付勢する付勢力に変換する変換部５２，１５Ａが形成される。【選択図】図２