Kobe Steel, Ltd.

Kei Morita

Naoki Sugano

Satoshi Maekawa

Takayuki Igaue

A liquid pressure rotary machine in which a rotation delay of a retainer with respect to a cylinder block is reduced and contact of pistons placed between the retainer and the cylinder block with peripheral members is suppressed is provided. A piston pump includes a rotation shaft, a cylinder block, piston heads, piston rods, a retainer, a swash plate, and a tilt adjustment mechanism. When the tilt adjustment mechanism swings the swash plate, a discharge amount of the piston pump becomes variable. The retainer to be rotated together with the piston heads and the piston rods is supported by a retainer bushing provided in the rotation shaft. By engaging ball pins of the retainer bushing with spherical surface pin grooves of the retainer, the retainer and the retainer bushing are integrally rotatable about the center axis of the rotation shaft and the retainer is swung about the spherical surface center.

Liquid pressure rotary machine

A hydraulic rotary machine configured to reduce sliding resistance of a reciprocating piston and to suppress a reduction in volumetric efficiency corresponding to an amount of leakage of hydraulic oil. A piston pump includes a rotor shaft, a cylinder block, a piston head, a piston rod, a retainer, a swash plate, and a tilt regulation mechanism. When the tilt regulation mechanism rocks the swash plate, the amount of discharge from the piston pump is variably changed. The retainer which rotates with both the piston head and the piston rod is supported by a retainer bush provided to the rotor shaft. The retainer sphere section of the retainer and the retainer bush sphere section of the retainer bush have spherical shapes having the same curvature. During the regulation of tilt, the retainer rocks while the retainer bush sphere section is in sliding contact with the retainer bush.

Hydraulic rotary machine

Provided is an electrically-driven flow rate control valve capable of controlling a flow rate of fluid while application of a high pressure of the fluid to a sub valve body connected to an electric motor is suppressed. A flow rate control valve includes a casing, an elevation drive device, and a main valve body. When the sub valve body moves upward by the elevation drive device, oil in a back pressure chamber is discharged. Moreover, the oil in a first oil chamber flows into the back pressure chamber while the flow rate of the oil is regulated. A balance among pressures in the back pressure chamber, the first oil chamber, and the second oil chamber changes, and the main valve body opens. When the main valve body is closed, a direct application of the pressure of the back pressure chamber to the sub valve body is blocked.

Electrically-driven flow rate control valve

Provided is an electrically-driven flow rate control valve capable of controlling a flow rate of a fluid flowing between two inlet/outlet ports, restraining a high pressure of the fluid from being applied to a sub valve body connected to an electric motor. The flow rate control valve has a casing, a raising/lowering drive device, a supply-switching valve, a main valve body, a valve-closing spring. When the electric motor of the raising/lowering drive device moves the sub valve body upward, oil of a back pressure chamber is discharged from a discharge oil passage through a sub valve body communication port and a sub valve body oil passage to open the main valve body. When the main valve body is closed, a pressure of the back pressure chamber is inhibited from being directly applied to a lower end face of the sub valve body.

Growing community of inventors

Kobe, Japan

Kei Morita