Pump device

Abstract

A pump device includes a shaft, a motor that rotates the shaft, and a pump that is driven by the motor via the shaft and discharges oil. The pump device includes a first flow path for the oil that connects an interior of the pump and an interior of a housing, a second flow path for the oil provided between a stator and a rotor of the motor, and a third flow path for the oil that is connected to a suction port of a pump through an outside of the stator and the rotor in a radial direction from the second flow path. In the first flow path, oil passes through at least one of a space between the shaft and a bearing, a space between the bearing and a pump case, and an interior of the bearing.

1 - 19 . (canceled) 
     
     
         20 . A pump device comprising:
 a shaft that rotates around a central axis that extends in an axial direction;   a motor that rotates the shaft; and   a pump that is positioned on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges oil; wherein   the motor includes:
 a rotor that rotates around the shaft; 
 a stator that faces the rotor; and 
 a housing in which the rotor and the stator are accommodated; 
   the pump includes:
 a pump rotor that is attached to the shaft; 
 a bearing that rotatably supports the shaft; and 
 a pump case in which a suction port into which the oil is sucked and a discharge port from which the oil is discharged are provided and the pump rotor is accommodated; 
   the pump device further comprises:
 a first flow path for the oil that connects an interior of the pump and an interior of the housing; 
 a second flow path for the oil provided between the stator and the rotor; and 
 a third flow path for the oil that is connected to a pump suction port through an outside of the stator and the rotor in a radial direction from the second flow path; and 
   in the first flow path, the oil passes through at least one of a space between the shaft and the bearing, a space between the bearing and the pump case, and an interior of the bearing.   
     
     
         21 . The pump device according to  claim 20 , wherein
 the pump case includes a pump cover and a pump body;   the pump body is open at both ends in the axial direction and the shaft extends therethrough; and   the pump rotor rotates according to rotation of the shaft.   
     
     
         22 . The pump device according to  claim 21 , wherein
 the pump body includes the bearing and the pump body includes a sliding bearing structure; and   in the first flow path, the oil passes between the shaft and the pump body.   
     
     
         23 . The pump device according to  claim 22 , wherein the first flow path includes a first connector in which a cutout is provided in at least one of the shaft and the pump body. 
     
     
         24 . The pump device according to  claim 21 , wherein, in the first flow path, the oil passes between the bearing and the pump body. 
     
     
         25 . The pump device according to  claim 24 , wherein the first flow path includes a second connector in which a cutout or a through-hole is provided in at least one of the bearing and the pump body. 
     
     
         26 . The pump device according to  claim 21 , wherein
 the bearing is a ball bearing including a plurality of balls; and   in the first flow path, the oil passes between adjacent ones of the plurality of balls.   
     
     
         27 . The pump device according to  claim 21 , wherein the stator and the pump body are capable of contacting each other. 
     
     
         28 . The pump device according to  claim 20 , wherein the stator is an integrally molded article made of a resin. 
     
     
         29 . The pump device according to  claim 20 , wherein the rotor is an integrally molded article made of a resin. 
     
     
         30 . The pump device according to  claim 20 , wherein
 the stator is positioned radially outward from the rotor; and   the third flow path includes a flow path connected to the pump suction port through the outside of the stator in the radial direction from the second flow path.   
     
     
         31 . The pump device according to  claim 30 , wherein the third flow path includes a space between an outer peripheral surface of the stator and an inner peripheral surface of the housing of the motor. 
     
     
         32 . The pump device according to  claim 31 , wherein the third flow path includes a through-hole or a cutout provided in the stator or a cutout provided in the housing. 
     
     
         33 . The pump device according to  claim 30 , wherein
 one end on a side of the motor of the first flow path is provided at or adjacent to a location on the side of the motor of the opening through which the shaft extends in the pump case; and   the second flow path is connected to one end on the side of the motor of the first flow path.   
     
     
         34 . The pump device according to  claim 30 , further comprising a flow path that is provided between an outer peripheral surface of the shaft and an inner peripheral surface of the rotor. 
     
     
         35 . The pump device according to  claim 30 , further comprising a flow path through which a through-hole provided in the rotor extends. 
     
     
         36 . A pump device comprising;
 a shaft that rotates a central axis that extends in an axial direction;   a motor that rotates the shaft; and   a pump that is positioned on one side of the motor in the axial direction, is driven by the motor via the shaft, and discharges oil; wherein   the motor includes:
 a rotor that rotates around the shaft; 
 a stator that faces an inner side of the rotor in a radial direction; 
 a housing in which the rotor and the stator are accommodated; 
   the pump includes:
 a pump rotor that is attached to the shaft; 
 a bearing that rotatably supports the shaft; and 
 a pump case in which a suction port into which the oil is sucked and a discharge port from which the oil is discharged are provided and the pump rotor is accommodated; 
   the pump device further comprises:
 a first flow path for the oil that connects an interior of the pump and an interior of the housing; 
 a second flow path for the oil provided between the stator and the rotor; and 
 a third flow path for the oil including a flow path that is connected to the second flow path through an inside of the stator and the rotor in a radial direction from the first flow path and a flow path that is connected to a pump suction port from the second flow path; and 
   in the first flow path, the oil passes through at least one of a space between the shaft and the bearing, a space between the bearing and the pump case, and an inside of the bearing.   
     
     
         37 . The pump device according to  claim 20 , wherein
 the rotor and the stator face each other in the axial direction; and   the third flow path includes a flow path that is provided inside the stator and the rotor in the radial direction and a flow path that is provided outside the stator and the rotor in the radial direction.   
     
     
         38 . The pump device according to  claim 34 , wherein
 the motor includes two rotors attached to the shaft with a predetermined interval therebetween in the axial direction;   the stator is disposed between the two rotors; and   the second flow path includes a flow path provided between a first of the two rotors and the stator, and a flow path provided between a second of the two rotors and the stator.