Slanting board type liquid pressure rotary machine

Japanese Patent JP6010428

B2

PROBLEM TO BE SOLVED: To provide a swash plate type hydraulic rotary machine capable of reducing shocking change or variation of fluid pressure generated when an intake stroke and a discharging stroke are changed over and reducing noise even if fluid flows out of a clearance at a spherical joint part.SOLUTION: A swash plate type hydraulic rotary machine comprises: a cylinder block installed in a casing in such a way that it is integrally rotated with a rotating shaft and formed with a plurality of cylinders spaced apart in a circumferential direction; a plurality of pistons inserted into each of the cylinders in the cylinder block in such a way that they can be reciprocated; oil passing holes arranged in an axial direction in each of the pistons; a shoe installed at a protrusion end of each of the pistons through a spherical joint part and having a static pressure pocket; a swash plate formed with a sliding surface where each shoe slides at the surface facing the cylinder block; an inner space part arranged inside the spherical joint part; a first restriction arranged at the spherical joint part so as cause one side of the inner space part to be communicated with the oil passing holes; and a second restriction arranged at a shoe to cause the other end of the inner space to be communicated with the static pressure pocket.

Kenta Suzuki
Makoto Henmi
Shigeyuki Sakurai
Motoji Suzuki

JP2012245541A

October 19, 2016

November 07, 2012

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Hitachi Construction Machinery Co., Ltd.

F04B1/22; F03C1/253

JP2012184707A
JP2004084660A
JP8511319A
JP2000170645A
JP2000009025A
JP48070901A
JP2001519007A

US5947003

Kaichi International Patent Office
Kasuga Toshiaki
Inoki Yuichi

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