Electrically driven dual pump

Patent metadata

Field	Value
Publication number	US-9541089-B2
Application number	US-201313962391-A
Country	US
Kind code	B2
Filing date	Aug 8, 2013
Priority date	Aug 14, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

In an electrically driven dual pump, a cylindrical outer rotor is rotatably disposed with respect to the inner circumferential surface side of the housing and has a plurality of permanent magnets on an outer circumferential surface of the outer rotor to constitute a motor section in cooperation with coils of a housing, a partitioning plate is disposed to partition an inner circumferential side of the outer rotor into a first pump chamber and a second pump chamber, and each of first and second inner rotors is rotatably disposed within the first and second pump chambers with a rotation center of each of the first and second inner rotors eccentric to the center of the outer rotor and constitutes a space against the outer rotor which is communicated with a corresponding one of the suction ports and the corresponding one of the discharge ports.

First claim

What is claimed is:

1. An electrically driven dual pump, comprising:
a housing comprising suction ports and discharge ports at respective end sections of the housing, the housing having a cylindrical inner circumferential surface and comprising a plurality of coils disposed in a circumferential direction of the housing;
a common shaft that extends between the respective end sections;
a cylindrical outer rotor rotatably disposed with respect to the inner circumferential surface side of the housing and having a plurality of permanent magnets on an outer circumferential surface of the outer rotor to comprise a motor section in cooperation with the coils of the housing;
a partitioning plate disposed to partition an inner circumferential side of the outer rotor into a first pump chamber and a second pump chamber;
a first inner rotor and second inner rotor, each of the first and second inner rotors being rotatably disposed within the first and second pump chambers with a rotation center of each of the first and second inner rotors eccentric to the center of the outer rotor, comprising a space against the outer rotor which is in communication with a corresponding one of the suction ports and the corresponding one of the discharge ports, and a plurality of slots radially formed on an outer circumferential surface of each of the first and second inner rotors; and
a plurality of linkage plates disposed to transmit a rotational force from the outer rotor to each of the first and second inner rotors, the respective linkage plates having an outer radial end section swingably supported on an inner circumferential section of the outer rotor and an inner radial end section slideably received in the respective slots of the first and second inner rotors, the linkage plates dividing the space formed between the outer rotor and each of the first and second inner rotors into a plurality of chambers,
wherein the partitioning plate protrudes from the outer rotor.

2. The electrically driven dual pump as claimed in claim 1 , wherein the first and second inner rotors are rotated with the common shaft supported on the housing as a center.

3. The electrically driven dual pump as claimed in claim 2 , wherein the partitioning plate is fixed onto the outer rotor.

4. The electrically driven dual pump as claimed in claim 1 , wherein a diameter of the inner circumferential surface of the outer rotor in the first pump chamber is equal to a diameter of the inner circumferential surface of the outer rotor in the second pump chamber.

5. The electrically driven dual pump as claimed in claim 1 , wherein diameters of the outer circumferential surfaces of the first and second inner rotors are equal to each other.

6. The electrically driven dual pump as claimed in claim 1 , wherein the outer rotor comprises plate supporting grooves formed on an inner circumferential surface of the outer rotor and an outer radial end section is swingably fitted into the respective plate supporting grooves, and wherein the respective permanent magnets are disposed on the outer circumferential surface of the outer rotor in an angular range defined between respective adjacent two of the plate supporting grooves which are disposed adjacent to each other in the circumferential direction of the outer rotor.

7. The electrically driven dual pump as claimed in claim 1 ,
wherein the suction ports comprise a first suction port and a second suction port, and the discharge ports comprise a first discharge port and a second discharge port,
wherein the housing comprises
a cylindrical circumferential wall; and
a body section having a cylindrical bottom wall at one end of the cylindrical circumferential wall and an end plate covering the other end of the circumferential wall, and

wherein the first suction port is formed in a first end section of the bottom wall of the housing configured to be in communication with the first pump chamber, and the first discharge port is formed in a second end section of the bottom wall of the housing configured to be in communication with the first pump chamber, the first and second end sections being separated from each other by a first predetermined angle, and
wherein the second suction port is formed on a third end section of the end plate of the housing configured to be in communication with the second pump chamber, and the second discharge port is formed in a fourth end section of the end plate of the housing configured to be in communication with the second pump chamber, the third and fourth end sections of the housing being separated from each other by a second predetermined angle and being opposite to the first and second end sections.

8. The electrically driven dual pump as claimed in claim 7 ,
wherein an outer circumferential surface of the bottom wall is provided with a first suction opening in communication with the first suction port and with a first discharge opening in communication with the first discharge port, and
wherein the outer circumferential surface of the end plate of the housing is provided with a second suction opening in communication with the second suction port and a second discharge opening in communication with the second discharge port.

9. The electrically driven dual pump as claimed in claim 8 , wherein the outer rotor, the first inner rotor and the linkage plates comprise a first pump section which supplies oil under pressure from the first suction port to the first discharge port, and the outer rotor, the second inner rotor and the linkage plates comprise a second pump section which supplies oil under pressure from the second suction port to the second discharge port.

10. The electrically driven dual pump as claimed in claim 1 , wherein the plurality of chambers into which the linkage plates divide the space include the first pump chamber and the second pump chamber.

Assignees

• Mahle Filter Systems Jp Corp

Inventors

• Yamashita Takahisa

Classifications

• F04C11/001

  of similar working principle · CPC title

• F04B17/03

  driven by electric motors · CPC title

• F04C11/008

  Enclosed motor pump units · CPC title

• F04C15/008

  Prime movers · CPC title

• F04D13/06 Primary

  the pump being electrically driven · CPC title