Fuel pump

Patent metadata

Field	Value
Publication number	US-10408219-B2
Application number	US-201415022336-A
Country	US
Kind code	B2
Filing date	Sep 15, 2014
Priority date	Sep 17, 2013
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A fuel pump includes a pump cover at one end portion of the housing, a cover end at the other end portion of the housing, a bearing supported by the cover end and rotatably supporting 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, 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 accommodating the bearing, and a connection part that connects together the base part and the bearing accommodating part. A length of the connection part is shorter than a length of the base part and a length of the bearing accommodating part, in a direction of the rotation axis.

First claim

The invention claimed is:

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; and
a connection part that connects together the base part and the bearing accommodating part;

the bearing accommodating part includes
a large inner diameter portion that supports the bearing,
an intermediate inner diameter portion that is located between the large inner diameter portion and the connection part, and that has a thickness greater than the thickness of the large inner diameter portion, and
a small inner diameter portion
that is located between the intermediate inner diameter portion and the connection part,
that is located between the large inner diameter portion and the connection part,
that has a thickness greater than a thickness of the large inner diameter portion and greater than the thickness of the intermediate inner diameter portion, and
that has an inner diameter smaller than a diameter of the shaft;

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 is shorter than a length of the bearing accommodating part in the direction of the rotation axis of the shaft;
a first distance between an upper end of the shaft and a lower end of the small inner diameter portion in the direction of the rotation axis of the shaft is shorter than a second distance between an upper end of the rotor and a lower end of the large inner diameter portion in the direction of the rotation axis of the shaft; and
a third distance between an upper end of the small inner diameter portion and the lower end of the small diameter portion is greater than a fourth distance between an upper end of the intermediate inner diameter portion and the lower end of the large inner diameter portion.

2. The fuel pump according to claim 1 , wherein a bottom wall that defines the accommodating space is located further inward of the housing than an inner wall of the connection part.

3. The fuel pump according to claim 1 , wherein the bearing is cylindrical.

4. The fuel pump according to claim 1 , wherein
the cover end comprises an annular groove between a radially inward facing inner wall of the base part and an outer wall of the bearing accommodating part.

5. 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 that includes an accommodating space that accommodates the bearing, that 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, and that has an axial length longer than an axial length of the base part; and
a connection part that connects together the base part and the bearing accommodating part;

the bearing accommodating part includes
a large inner diameter portion that supports the bearing, and
a small inner diameter portion
that is located between the large inner diameter portion and the connection part,
that has a thickness greater than a thickness of the large inner diameter portion, and
that has an inner diameter smaller than a diameter of the shaft;

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 is shorter than a length of the bearing accommodating part in the direction of the rotation axis of the shaft; and
a first distance between an upper end of the shaft and a lower end of the small inner diameter portion in the direction of the rotation axis of the shaft is shorter than a second distance between an upper end of the rotor and a lower end of the large inner diameter portion in the direction of the rotation axis of the shaft.

6. 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 ce

Assignees

• Denso Corp

Inventors

• Sakai Hiromi
• Nagata Kiyoshi
• Ootake Masaya

Classifications

• F02M59/44

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F04D29/047

  hydrostatic; hydrodynamic · CPC title

• F04D29/668

  damping or preventing mechanical vibrations · CPC title

• F04D13/06

  the pump being electrically driven · CPC title

• F02M37/048

  Arrangements for driving regenerative pumps, i.e. side-channel pumps · CPC title