To introduce an operation liquid to a plunger and the spherical surface contact part of a shoe surely, without inviting the leak of the operation liquid from a plunger part.
A swash plate 16 is installed on the end of a drive shaft 13 and a cylinder block 11 is arranged on a position facing to the swash plate 16 in a housing 6. A thrust plate 41 is attached on the swash plate 16 through an auxiliary plate 38. A shoe 21 spherical surface contacting with the end surface is installed on each plunger 19 held on the cylinder block 11. The thrust plate 41 is contacted to each plunger 19 through the shoe 21. A through hole 33 is formed on the shoe 21 and a ring shape groove 35 is formed on the thrust plate 41. An operation liquid introduction passage for introducing the operation liquid with the low viscosity of the low pressure room 48 in a pump to each slide-contact surface is constituted by the ring shape groove 35 and through hole 33.
HORI TOSHIAKI (JP)
WATANABE HIROYUKI (JP)
AKIBA HIROKAZU (JP)
OHTAKI MIZUO (JP)
