Electric pump

Abstract

An electric pump includes a motor, a pump, an electric pump case, a pressure sensor device to measure a pressure of fluid, and a circuit board. The pump includes a pump gear to rotate along with rotation of a shaft, and a pump body including a pump chamber recessed from a surface and housing the pump gear, and a through-hole with openings at two ends in an axial direction, one of the openings being opened to the pump chamber. The pressure sensor device includes a pressure sensor device body between the pump and the motor, and an electrical connection cable electrically connecting the pressure sensor device body and the circuit board. The electrical connection cable is routed from the pressure sensor device body to the circuit board inside of the electric pump case.

1 - 5 . (canceled) 
     
     
         6 : An electric pump comprising:
 a shaft to rotate about a central axis extending in an axial direction;   a motor to rotate the shaft;   a pump positioned on a first side of the motor in the axial direction to be driven through the shaft by the motor;   a tubular electric pump case that houses the shaft, the motor, and the pump and to which the motor and the pump are fixed;   a pressure sensor device to measure a pressure of fluid pressurized by the pump; and   a circuit board positioned on a second side of the motor in the axial direction and electrically connected with the motor; wherein   the pump includes:
 a pump gear to rotate along with rotation of the shaft; and 
 a pump body including a pump chamber recessed from a surface on the first side in the axial direction toward the second side in the axial direction and housing the pump gear, and a through-hole including openings at two ends in the axial direction through which the shaft penetrates, the opening on the first side in the axial direction being opened to the pump chamber; 
   the pressure sensor device includes:
 a pressure sensor device body disposed between the pump and the motor in the axial direction; and 
 an electrical connection cable electrically connecting the pressure sensor device body and the circuit board; and 
   the electrical connection cable is routed from the pressure sensor device body to the circuit board through an inside of the electric pump case in a radial direction.   
     
     
         7 : The electric pump according to  claim 6 , wherein the pump includes:
 an introduction oil path through which the fluid is taken into the pump chamber; and   a discharging oil path through which the fluid is discharged from the pump chamber; and   the pump body includes:   a sensor housing recess recessed from a surface on the second side in the axial direction toward the first side in the axial direction and housing the pressure sensor device body; and   a detection oil path connecting the discharging oil path and the sensor housing recess.   
     
     
         8 : The electric pump according to  claim 6 , wherein
 the motor includes a stator disposed along a circumferential direction on an outer side of the shaft in the radial direction;   the stator includes:
 an annular core back; 
 a plurality of teeth extending from the core back inward in the radial direction and disposed along the circumferential direction; and 
 a plurality of coils wound around the plurality of teeth, respectively; and 
   the electrical connection cable is routed from the pressure sensor device body to the circuit board through a space between the teeth adjacent to each other in the circumferential direction.   
     
     
         9 : The electric pump according to  claim 6 , further comprising:
 a rotation sensor electrically connected with the circuit board to measure rotation of the motor;   a power terminal electrically connected with the circuit board to supply power to the rotation sensor; and   a ground terminal electrically connected with the circuit board to ground the rotation sensor; wherein   the electrical connection cable includes:
 a power lead line to supply power to the pressure sensor device body; and 
 a ground lead line to ground the pressure sensor device body; 
   the power lead line is electrically connected with the power terminal; and   the ground lead line is electrically connected with the ground terminal.   
     
     
         10 : The electric pump according to  claim 6 , further comprising:
 a holder holding the circuit board;   a first connector to fix the electrical connection cable to the holder; and   a second connector to fix the electrical connection cable to the pump body.