Abstract: The purpose of the present invention is to provide a pump device that has a function to separate foreign matter from a working fluid in which foreign matter is mixed and that is capable of supporting a large working fluid flow rate. The present invention includes a first pump that is provided above a working fluid reservoir, and a second pump that has a rotary shaft that is concentric with a rotary shaft of the first pump and that is provided further down than an inlet of the first pump. A centrifuge filtration device having functionality to separate foreign matter from the working fluid is provided in an area below the inlet of the first pump and above the second pump, and the centrifuge filtration device is disposed so that the inner diameter on the second pump side is large and the inner diameter on the first pump side is small.

Abstract: The purpose of the present invention is to provide a vane pump that is able to prevent decrease of power transmission efficiency when the vane pump is used in combination with a device such as a transmission device, for example. Therefore, this vane pump (10, 20, 50, 60, 70, 80, 90) has a hollow shaft (1, 21, 51, 61, 71, 81, 91), the hollow shaft (1, 21, 51, 61, 71, 81, 91) is configured such that a hollow portion thereof allows a rotation driving shaft (which is, for example, an input shaft 103 of a transmission device as illustrated in FIG. 1, and, which also includes an input shaft which is inserted directly into the transmission device from a driving source 102 without having a coupling interposed therebetween) of the driving source (102) to be inserted therethrough, and the hollow shaft (1, 21, 51, 61, 71, 81, 91) and the rotation driving shaft (103) are coupled by means of a mechanism (spline, key and key groove, etc.) for transmitting a torque but transmitting no thrust.

Abstract: The present invention is a filter mechanism provided in a pump or the like, and the purpose thereof is to provide a filter mechanism that can eliminate foreign matter adhering to the surface of a filter and thereby can prevent clogging of filters because of foreign matter. According to the present invention, an area toward the inside in the direction of the radius of the filter is linked to an intake opening (235) of the pump (for example, a trochoid pump (22)) and, via the pump (22) to a pump ejection opening (trochoid pump ejection opening (215)), and an area between a filter (5) and (an inside wall surface (3i) of) a first casing (3) is linked to a low-pressure ejection opening (discharge opening (237)) for a working fluid.

Abstract: The present invention is a filter mechanism provided in a pump or the like, and the purpose thereof is to provide a filter mechanism that can eliminate foreign matter adhering to the surface of a filter and thereby can prevent clogging of filters because of foreign matter. According to the present invention, an area toward the inside in the direction of the radius of the filter is linked to an intake opening (235) of the pump (for example, a trochoid pump (22)) and, via the pump (22) to a pump ejection opening (trochoid pump ejection opening (215)), and an area between a filter (5) and (an inside wall surface (3i) of) a first casing (3) is linked to a low-pressure ejection opening (discharge opening (237)) for a working fluid.

Abstract: The present invention is a filter mechanism provided in a pump or the like, and the purpose thereof is to provide a filter mechanism that can eliminate foreign matter adhering to the surface of a filter and thereby can prevent clogging of filters because of foreign matter. According to the present invention, an area toward the inside in the direction of the radius of the filter is linked to an intake opening (235) of the pump (for example, a trochoid pump (22)) and, via the pump (22) to a pump ejection opening (trochoid pump ejection opening (215)), and an area between a filter (5) and (an inside wall surface (3i) of) a first casing (3) is linked to a low-pressure ejection opening (discharge opening (237)) for a working fluid.

Abstract: The purpose of the present invention is to suppress the occurrence of unevenness in a rotor of an internal gear pump, suppress the formation of gaps between the end surfaces (side surfaces) of an inner rotor and an outer rotor, and to prevent a decline in volume efficiency. Thus, the pump device of the present invention includes an internal gear pump (10), in which an inner rotor (13) is inscribed to an outer rotor (12), and includes a plate member (7) which is provided to an end surface of the rotors. The plate member (7) is formed of a material having high hardness, has a shape that does not block a suction port (150), has a through-hole (73) formed therein, and has O-ring grooves (71,72), which each have a continuous shape and house an O-ring formed therein.

Abstract: A coolant supply device and supply method that can appropriately control the spraying of coolant using a single parameter. A pump (101) supplies coolant to a tool (D), and a measurement device (22) measures the discharge pressure of the pump (101). A control device (50) has a function for determining, from the rotation rate of the pump (101), the coolant flow path diameter for the tool (D) and the target value for the pump discharge pressure (target pressure) when the tool (D) is drilling.

Abstract: The purpose of the present invention is to provide a small, light coolant-pump device equipped with a filter, said coolant-pump device not requiring regular maintenance. The present invention is provided with: a positive-displacement pump (9); a cyclone filter (12) provided on the intake side of the positive-displacement pump; and a non-positive-displacement pump (40) provided on the intake side of the cyclone filter (12). The cyclone filter (12) contains a primary cyclone (20) and a secondary cyclone (30) each provided with a mechanism (outlet (20c and 30c)) through which separated foreign substances (cutting debris and the like) are expelled. The present invention is set such that the discharge rate of the non-positive-displacement pump (40) is higher than the discharge rate of the positive-displacement pump (9). The positive-displacement pump (9), cyclone filter (12), and non-positive-displacement pump (40) are connected in a vertical straight line.

Abstract: The purpose of the present invention is to provide a pump device that has a function to separate foreign matter from a working fluid in which foreign matter is mixed and that is capable of supporting a large working fluid flow rate. The present invention includes a first pump that is provided above a working fluid reservoir, and a second pump that has a rotary shaft that is concentric with a rotary shaft of the first pump and that is provided further down than an inlet of the first pump. A centrifuge filtration device having functionality to separate foreign matter from the working fluid is provided in an area below the inlet of the first pump and above the second pump, and the centrifuge filtration device is disposed so that the inner diameter on the second pump side is large and the inner diameter on the first pump side is small.

Abstract: The purpose of the invention is to provide a coolant supply device and supply method that can appropriately control the spraying of coolant using a single parameter. To that end, the invention is provided with a pump (101) that supplies coolant to a tool (D), a measurement device (22) that measures the discharge pressure of the pump (101), and a control device (50). The control device (50) has a function for determining, from the rotation rate of the pump (101), the coolant flow path diameter for the tool (D) and the target value for the pump discharge pressure (target pressure) when the tool (D) is drilling.

Abstract: The present invention is a filter mechanism provided in a pump or the like, and the purpose thereof is to provide a filter mechanism that can eliminate foreign matter adhering to the surface of a filter and thereby can prevent clogging of filters because of foreign matter. According to the present invention, an area toward the inside in the direction of the radius of the filter is linked to an intake opening (235) of the pump (for example, a trochoid pump (22)) and, via the pump (22) to a pump ejection opening (trochoid pump ejection opening (215)), and an area between a filter (5) and (an inside wall surface (3i) of) a first casing (3) is linked to a low-pressure ejection opening (discharge opening (237)) for a working fluid.