FUEL PUMP

摘要

A fuel pump includes a pump cover that is provided at one end portion of the housing and includes an inlet port, a cover end that is provided at the other end portion of the housing and includes a discharge port, a bearing that is supported by the cover end and rotatably supports an end portion of the shaft on the cover end-side. The cover end includes a base part that covers the other end portion, a discharge part that is connected to the base part and includes the discharge port, a bearing accommodating part which is formed such that a cross-section of the bearing accommodating part perpendicular to a rotation axis of the shaft has an annular shape and which includes an accommodating space that accommodates the bearing, and a connection part that connects together the base part and the bearing accommodating part. A length of the connection part in a direction of the rotation axis is shorter than a length of the base part in the direction of the rotation axis, and a length of the bearing accommodating part in the direction of the rotation axis.

主权项

1. A fuel pump comprising:
a cylindrical housing; a pump cover that is provided at one end portion of the housing and includes an inlet port through which fuel is drawn into the housing; a cover end that is provided at the other end portion of the housing and includes a discharge port through which fuel is discharged to outside of the housing; a cylindrical stator on which a plurality of winding wires are wound and which is accommodated inside the housing; a rotor that is rotatably provided radially inward of the stator; a shaft that is provided coaxially with the rotor and rotates integrally with the rotor; a bearing that is supported by the cover end and rotatably supports an end portion of the shaft on the cover end side; and an impeller that is provided at an end portion of the shaft on the pump cover side and rotates together with the shaft to pressurize fuel flowing in through the inlet port and to discharge the pressurized fuel through the discharge port, wherein: the cover end includes:
a base part that covers the other end portion of the housing;a discharge part that is connected to the base part and includes the discharge port;a bearing accommodating part which includes an accommodating space that accommodates the bearing and which is formed such that a cross-section of the bearing accommodating part perpendicular to a rotation axis of the shaft has an annular shape point-symmetric with respect to a central axis of the accommodating space; anda connection part that connects together the base part and the bearing accommodating part; and a length of the connection part in a direction of the rotation axis of the shaft is shorter than a length of the base part in the direction of the rotation axis of the shaft, and a length of the bearing accommodating part in the direction of the rotation axis of the shaft; and an inner wall of the connection part is located further outside in a direction of the central axis of the accommodating space than a bottom wall of the accommodating space.