| CPC F04C 15/06 (2013.01) [F04C 2/10 (2013.01); F04C 2210/206 (2013.01); F04C 2240/30 (2013.01); F05B 2280/6015 (2013.01)] | 2 Claims |
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1. An oil pump comprising:
a first case member made of a metal and having a rotor housing portion in which a rotor is rotatably housed, and a discharge hole through which oil within the rotor housing portion is introduced to the outside of the rotor housing portion by rotation of the rotor;
a second case member made of a metal and provided axially outside of and adjacent to an opening which is provided in the first case member at a side of the first case member opposite to the discharge hole in an axial direction for closing a housing space formed in the rotor housing portion; and
a housing made of a resin and having a case holding portion in which the rotor housing portion is held, and a discharge groove portion provided on a bottom portion of the case holding portion, wherein
the first case member has a fitting groove portion that is provided on a bottom portion of the rotor housing portion and that is fitted to the discharge groove portion so as to cover the discharge groove portion,
the second case member has a communication groove provided at a position opposing the fitting groove portion in an axial direction and that communicates with the housing space and
the fitting groove portion includes a bottom portion extending from the discharge hole in a radial direction, and a side portion surrounding an entire periphery of the bottom portion of the fitting groove portion, the side portion projecting from the bottom portion of the rotor housing portion in the axial direction,
the discharge hole is formed in the bottom portion of the fitting groove portion so that, on a surface of the bottom portion opposite to the communication port, a wall body extending in the radial direction is continuous with an entire circumference of the discharge hole from an entirety of a circumferential edge of the discharge hole to an entirety of the side portion of the fitting groove portion,
wherein
the housing has a communication port that is formed in the discharge groove portion and that communicates with the discharge hole,
the fitting groove portion is formed such that the discharge hole has a diameter equal to or smaller than that of the communication port,
the fitting groove portion is formed to be a shape corresponding to the discharge groove portion, the bottom portion of the fitting groove portion opposes a bottom portion of the discharge groove portion and is directly connected thereto and the side portion of the fitting groove portion opposes a side portion of the discharge groove portion and is directly connected thereto, and
the fitting groove portion is disposed so that the discharge hole is fitted adjacent to the communication port.
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