Fuel pump
AssigneeDenso Corporation
InventorsYuuji HIDAKA, Masaya OOTAKE
Life of this patent
Estimating the term…
Abstract
An outer wall surface of an output end portion includes a pair of first plane surfaces which are formed at different positions in its circumferential direction. An inner wall surface of a fitting hole includes a pair of second plane surfaces which are formed at different positions in the circumferential direction. A clearance between one of the pair of first plane surfaces and one of the pair of second plane surfaces is made larger from one side toward the other side in an axial direction in a state that a rotary shaft and an impeller are concentric with each other.
Claims12
A fuel pump comprising:
- a motor;
- an impeller that includes a fitting hole fitted to an output end portion of a rotary shaft of the motor;
- and
- a case that includes:
- a pump chamber that receives the impeller;
- a suction hole that passes through from the pump chamber to one side in an axial direction of the rotary shaft;
- and
- a discharge hole that passes through from the pump chamber to the other side in the axial direction, wherein:
- an outer wall surface of the output end portion includes a pair of first plane surfaces which are formed at different positions in a circumferential direction of the output end portion;
- an inner wall surface of the fitting hole includes a pair of second plane surfaces which are formed at different positions in the circumferential direction;
- and
- a clearance between one of the pair of first plane surfaces and one of the pair of second plane surfaces is made larger from one side toward the other side in the axial direction in a state that the rotary shaft and the impeller are concentric with each other.
6-9. (canceled)
A fuel pump comprising:
- a motor;
- an impeller that includes a fitting hole fitted to an output end portion of a rotary shaft of the motor;
- and
- a case that includes:
- a pump chamber that receives the impeller;
- a suction hole that passes through from the pump chamber to one side in an axial direction of the rotary shaft;
- and
- a discharge hole that passes through from the pump chamber to the other side in the axial direction, wherein:
- an outer wall surface of the output end portion includes:
- a pair of first plane surfaces which are formed at different positions in a circumferential direction of the output end portion;
- and
- a pair of first curved surfaces, each of which is located between one of the pair of first plane surfaces and the other one of the pair of first plane surfaces in the circumferential direction and projects radially outward;
- an inner wall surface of the fitting hole includes:
- a pair of second plane surfaces which are formed at different positions in the circumferential direction;
- and
- a pair of second curved surfaces, each of which is located between one of the pair of second plane surfaces and the other one of the pair of second plane surfaces in the circumferential direction and is recessed radially outward;
- and
- a clearance between the one of the pair of first plane surfaces and the one of the pair of second plane surfaces is made larger from the one side toward the other side in the axial direction in a state that the rotary shaft and the impeller are concentric with each other.
Dependencies are inferred from the claim text.