Abstract: The present invention relates to a vane-type rotary machine suitable for use in applications where a low-viscosity fluid such as water is used as a working fluid. According to the present invention, a vane-type rotary machine having a rotor (11) mounted with vanes and rotatably housed in a cam casing (10) includes a motor supply opening (or pump discharge opening) (30) for a working fluid, a motor return opening (or pump suction opening) (20) formed in the cam casing for a working fluid, and branch flow passages (23, 25, 33 and 35) branched from the motor supply opening (or pump discharge opening) and the motor return opening (or the pump suction opening) and communicating with vane chambers (22, 24, 32 and 34). The distances of the branch flow passages are identical to each other.

Abstract: A vane-type hydraulic motor includes a rotor (30) having a main shaft (70) and a plurality of vanes (35), a cam casing (10) having a chamber (11) for rotatably housing the rotor (30), a first port (13) and a second port (15) for supplying a working fluid into the chamber (11) and discharging the working fluid from the chamber (11). A bypass path (80) is provided for allowing the working fluid to flow from bearing portions (51, 61) supporting the main shaft (70). A drain port (17) is provided for discharging the working fluid to the exterior.

Abstract: A hydraulic drive system that does not cause a decrease in efficiency of actuators, does not hinder an optimal action of devices such as flow adjustment valves, and does not cause any corrosion of water acting as an operating fluid. The system uses water as an operating fluid. The system includes a hydraulic generation apparatus 40 including, a main tank 41, a return path 52, an accessory tank 54, and a water disposal apparatus 56 disposed in a path 57. The operating fluid from structuring devices of the processing apparatuses 10, 20 and 30 flows through the return path 52. The operating fluid flows from the accessory tank 54 to the main tank 41 through the path 57 and the water disposal apparatus 56.

Abstract: The present invention relates to a vane-type rotary machine suitable for use in applications where a low-viscosity fluid such as water is used as a working fluid. According to the present invention, a vane-type rotary machine having a rotor (11) mounted with vanes and rotatably housed in a cam casing (10) includes a motor supply opening (or pump discharge opening) (30) for a working fluid, a motor return opening (or pump suction opening) (20) formed in the cam casing for a working fluid, and branch flow passages (23, 25, 33 and 35) branched from the motor supply opening (or pump discharge opening) and the motor return opening (or the pump suction opening) and communicating with vane chambers (22, 24, 32 and 34). The distances of the branch flow passages are identical to each other.

Abstract: A hydraulic drive system that does not cause a decrease in efficiency of actuators, does not hinder an optimal action of devices such as flow adjustment valves, and does not cause any corrosion of water acting as an operating fluid. The system uses water as an operating fluid. The system includes a hydraulic generation apparatus 40 including, a main tank 41, a return path 52, an accessory tank 54, and a water disposal apparatus 56 disposed in a path 57. The operating fluid from structuring devices of the processing apparatuses 10, 20 and 30 flows through the return path 52. The operating fluid flows from the accessory tank 54 to the main tank 41 through the path 57 and the water disposal apparatus 56.

Abstract: A solenoid has a cylindrical excitation coil and a plunger movable in the excitation coil and generates electromagnetic force to move the plunger when an electric current is supplied to the excitation coil. A cover for closing a side of a plunger compartment accommodating the plunger is provided with upper and lower through-holes communicatively extending through the cover from the outside of the solenoid to the plunger compartment. The uppermost part of the upper through-hole is above or level with the uppermost part of the plunger compartment. The lowermost part of the lower through-hole is below or level with the lowermost part of the plunger compartment.

Abstract: A solenoid has a cylindrical excitation coil and a plunger movable in the excitation coil and generates electromagnetic force to move the plunger when an electric current is supplied to the excitation coil. A cover for closing a side of a plunger compartment accommodating the plunger is provided with upper and lower through-holes communicatively extending through the cover from the outside of the solenoid to the plunger compartment. The uppermost part of the upper through-hole is above or level with the uppermost part of the plunger compartment. The lowermost part of the lower through-hole is below or level with the lowermost part of the plunger compartment.

Abstract: The present invention relates to a vane rotary machine such as a vane pump or a vane motor. The vane rotary machine has a rotor (15) supporting vanes (60) thereon and housed in a cam casing (10), and a main shaft (40) attached to the rotor (15) and rotatably supported by a bearing assembly (200, 250). A working fluid from a discharge port (13) is branched and led to the bearing assembly (200, 250) by a fluid path (180). The main shaft (40) has a working fluid introduction recess (220) defined in a region thereof in which the bearing assembly (200, 250) is disposed, and the main shaft has a reduced diameter in the working fluid introduction recess. The working fluid is introduced into the working fluid introduction recess (220).

Abstract: An elevation and index apparatus of a water hydraulic driven type has a rotary table (5) supported pivotally by a cross roller bearing (15), a water hydraulic motor (9) and a water hydraulic cylinder (8), each fixed to a table base (14) supporting a power transmission mechanism and the cross roller bearing (15), a main elevation shaft (7) connected to an output shaft of the water hydraulic cylinder (8), an elevation and index table (1) connected to the main elevation shaft (7) through a bearing (7a) and connected to the rotary table (5) so as to restrict pivotal movement, and a casing (18) disposed outside the table base (14) and enclosing the power transmission mechanism.

Abstract: A hydraulic servovalve controls the direction of flow of a working fluid and a flow rate of a working fluid between a plurality of ports. The hydraulic servovalve includes a spool axially movably disposed in a valve body for changing a direction of a working fluid and varying a flow rate of the working fluid, a sleeve disposed in the valve body and having a spool hole for housing the spool, a pair of hydrostatic bearings disposed in the sleeve around respective opposite end portions of the spool, and a plurality of windows defined in the sleeve as control orifices for controlling a flow rate of a working fluid. The hydraulic servovalve further includes a fluid passageway communicating between the supply port and the control port through one of the windows, and a fluid passageway communicating between the control port and the return port through the other of the windows.