Electric pump

Patent metadata

Field	Value
Publication number	US-2016356271-A1
Application number	US-201615169886-A
Country	US
Kind code	A1
Filing date	Jun 1, 2016
Priority date	Jun 5, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

An electric pump includes: a motor rotor having a cylindrical yoke; a pump portion having outer and inner rotors; a shaft transmitting a rotational force from the motor rotor to the pump portion; a motor housing in which a coil portion is fixed to an inner peripheral surface and the motor rotor is housed on the inside of the coil portion; and a pump main body housing the pump portion, wherein the pump main body has a bearing portion supporting a portion of the shaft between the motor rotor and the inner rotor, and the inner rotor has a first recessed portion of a diameter greater than that of the shaft on a side facing the bearing portion and a part of the bearing portion is inserted into the first recessed portion to be disposed.

First claim

What is claimed is:

1 . An electric pump comprising:
a motor rotor that has a cylindrical yoke and is rotated by an electromagnetic force; a pump portion that has an outer rotor and an inner rotor; a shaft that transmits a rotational force from the motor rotor to the pump portion by fixing the motor rotor on one side and fixing the inner rotor on the other side; a motor housing in which a coil portion is fixed to an inner peripheral surface and the motor rotor is housed on the inside of the coil portion; and a pump main body that houses the pump portion, wherein the pump main body has a bearing portion that supports a portion of the shaft between the motor rotor and the inner rotor, and wherein the inner rotor has a first recessed portion of a diameter greater than that of the shaft on a side facing the bearing portion and a part of the bearing portion is inserted into the first recessed portion to be disposed.

2 . The electric pump according to claim 1 ,
wherein the motor rotor has a second recessed portion of a diameter greater than that of the shaft on a side facing the bearing portion and a part of the bearing portion is inserted into the second recessed portion to be disposed.

3 . The electric pump according to claim 2 ,
wherein the yoke includes a first yoke that is positioned on an inner peripheral side of the coil portion and a second yoke that is provided continuously to the first yoke and protrudes on a side opposite to the pump portion with respect to the first yoke in an axial direction of the yoke, and wherein a hole portion capable of fixing the shaft is formed in the second yoke and the second recessed portion is formed on a side facing the bearing portion in the first yoke.

4 . The electric pump according to of claim 1 ,
wherein an end portion of the shaft protruding from the pump portion is journaled by the pump main body.

5 . The electric pump according to of claim 2 ,
wherein an end portion of the shaft protruding from the pump portion is journaled by the pump main body.

6 . The electric pump according to of claim 3 ,
wherein an end portion of the shaft protruding from the pump portion is journaled by the pump main body.

7 . The electric pump according to claim 1 ,
wherein the shaft and the bearing portion are formed of a ferrous material.

8 . The electric pump according to claim 2 ,
wherein the shaft and the bearing portion are formed of a ferrous material.

9 . The electric pump according to claim 3 ,
wherein the shaft and the bearing portion are formed of a ferrous material.

10 . The electric pump according to claim 4 ,
wherein the shaft and the bearing portion are formed of a ferrous material.

11 . The electric pump according to claim 1 ,
wherein the cylindrical yoke includes magnetic bodies that are laminated so that a through-hole continuous along the axial direction of the yoke is formed and a resin portion with which the through-hole is filled.

12 . The electric pump according to claim 2 ,
wherein the cylindrical yoke includes magnetic bodies that are laminated so that a through-hole continuous along the axial direction of the yoke is formed and a resin portion with which the through-hole is filled.

13 . The electric pump according to claim 3 ,
wherein the cylindrical yoke includes magnetic bodies that are laminated so that a through-hole continuous along the axial direction of the yoke is formed and a resin portion with which the through-hole is filled.

14 . The electric pump according to claim 4 ,
wherein the cylindrical yoke includes magnetic bodies that are laminated so that a through-hole continuous along the axial direction of the yoke is formed and a resin portion with which the through-hole is filled.

15 . The electric pump according to claim 5 ,
wherein the cylindrical yoke includes magnetic bodies that are laminated so that a through-hole continuous along the axial direction of the yoke is formed and a resin portion with which the through-hole is filled.

Assignees

• Aisin Seiki

Inventors

• Iwase Shogo
• Nagata Kenjiroh

Classifications

• F04C2240/50

  Bearings · CPC title

• F04C2/103

  one member having simultaneously a rotational movement about its own axis and an orbital movement · CPC title

• F04C15/008

  Prime movers · CPC title

• F04C2210/206

  Oil · CPC title

• F04C2240/60

  Shafts · CPC title