| 摘要 |
A bearing receiving portion includes a receiving space that receives a bearing, which rotatably supports an end portion of a shaft. The bearing receiving portion includes an intermediate inner diameter portion, which receives the end portion of the shaft, and a small inner diameter portion, which includes a column shape space having an inner diameter that is smaller than an outer diameter of the end portion. Fuel in an inside of a housing flows into or flows out relative to the receiving space. When the shaft is moved toward an upside, the fuel, which is accumulated in a space formed by a bottom wall, an inner wall and an end surface, functions as a damper to reduce a relative moving speed of the shaft relative to the bearing receiving portion. |
| 主权项 |
1. A fuel pump comprising:
a housing that is configured into a tubular form; a pump cover that includes a suction port, through which fuel is drawn into an inside of the housing, wherein the pump cover is installed to one end portion of the housing; a cover end that includes a discharge port, through which the fuel is discharged to an outside of the housing, wherein the cover end is installed to another end portion of the housing; a stator, around which a plurality of windings is wound, wherein the stator is configured into a tubular form and is received in the housing; a rotor that is rotatably placed on a radially inner side of the stator; a shaft that is coaxial 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, which is located on the cover end side; a bearing receiving portion that is formed in a portion of the cover end located in the inside of the housing, wherein the bearing receiving portion has a receiving space, which receives the bearing; and an impeller that is installed to an end portion of the shaft, which is located on the pump cover side, wherein when the impeller is rotated together with the shaft, the impeller pressurizes the fuel drawn through the suction port and discharge the pressurized fuel through the discharge port, wherein: the bearing receiving portion includes:
a first tubular portion that is configured into a tubular form and receives the end portion of the shaft, which is located on the cover end side; anda second tubular portion that is configured into a tubular form having a bottom and connects between the first tubular portion and the cover end, wherein the fuel, which is present in the housing, flows into or flows out of the receiving space; and an inner diameter of the receiving space in the second tubular portion is smaller than an outer diameter of the end portion of the shaft, which is located on the cover end side. |
