Oil pump of vehicle having inner ring

Patent metadata

Field	Value
Publication number	US-11022134-B2
Application number	US-201916355043-A
Country	US
Kind code	B2
Filing date	Mar 15, 2019
Priority date	May 18, 2018
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

The present disclosure provides an oil pump including a housing in which a space is formed, a rotor installed to be rotatable in an eccentric position in the housing and having vanes mounted along a circumference direction to be protruded and retracted in a radial direction of the housing, and an inner ring fitted to an inner surface of the housing and rotated along with the rotor when the rotor rotates. The housing is formed of a material harder than the material of the inner ring, and oil for lubrication is provided between the housing and the inner ring.

First claim

What is claimed is:

1. An oil pump for a vehicle, the oil pump comprising:
a housing forming a space;
a rotor installed to be rotatable in an eccentric position in the housing, the rotor having vanes mounted along a circumferential direction to be protruded and retracted in a radial direction of the housing; and
an inner ring fitted to an inner surface of the housing, the inner ring configured to rotate along with the rotor when the rotor rotates,
wherein:
a first groove is formed on the inner surface of the housing along the circumferential direction of the housing,
a second groove is formed on an outer surface of the inner ring along the circumferential direction,
the first groove and the second groove are configured to flow oil between the inner ring and the housing and reduce a friction between the inner ring and the housing,
the housing is formed of a material harder than the inner ring,
the inner ring is configured to rotate in the same direction as the vanes rotate when the rotor rotates, and
the inner ring is configured to rotate along with the vanes when the vanes rotate, and the inner ring is configured to rotate later than the rotor.

2. The oil pump of claim 1 , wherein the housing is made of synthetic resin material.

3. The oil pump of claim 2 , wherein the housing is made of thermosetting phenolic resin material.

4. The oil pump of claim 1 , wherein the housing is made of a light metal having a specific gravity lower than gravity of steel.

5. The oil pump of claim 1 , wherein the inner ring is made of the same material as the vanes.

6. The oil pump of claim 1 , wherein the housing is provided with at least an oil supply hole for supplying oil between the inner surface of the housing and the inner ring.

7. The oil pump of claim 1 , wherein an outer surface of the housing is provided with at least one pocket formed concavely from the outside of the housing to the inner surface of the housing.

8. The oil pump of claim 7 , wherein the at least one pocket comprises a plurality of pockets that is formed along the circumferential direction and a height direction of the housing.

9. The oil pump of claim 1 , wherein the vanes are slidable in the radial direction and installed at intervals along the circumferential direction.

10. The oil pump of claim 1 , wherein the inner ring is formed in a cylinder shape to be fitted to the inner surface of the housing.

11. The oil pump of claim 1 , wherein the first groove is formed in a spiral pattern on the inner surface of the housing and configured to supply the oil between the housing and the inner ring.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Myung Hwa Ind Co Ltd

Inventors

• Doo Jae-Kyun
• Oh Kyung-Hwan
• Jung Hyun-Eu

Classifications

• F04C2/3442 Primary

  the surfaces of the inner and outer member, forming the working space, being surfaces of revolution · CPC title

• F04D29/2294 Primary

  for protection, e.g. against abrasion · CPC title

• F01M2001/0238

  Rotary pumps · CPC title

• F05C2201/02

  Light metals · CPC title

• F04D29/2266

  for sealing or thrust balance (F04D29/04 and F04D29/16 take precedence) · CPC title