Motor driven power steering system

Patent metadata

Field	Value
Publication number	US-9969423-B2
Application number	US-201615004684-A
Country	US
Kind code	B2
Filing date	Jan 22, 2016
Priority date	Feb 3, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A motor driven power steering (MDPS) system is disclosed. The MDPS system includes a driving member configured to rotate about an axis; a worm shaft member having a worm gear and configured to rotate while engaged with a worm wheel; and a coupler member interposed between the driving member and the worm shaft member and configured to couple the driving member and the worm shaft and transmit power from the driving member to the worm shaft member. The coupler member includes a couple sleeve portion configured to receive and hold the driving member and the worm shaft member and a sleeve pressurizing portion surrounding the couple sleeve portion and configured to pressurize the couple sleeve portion toward the driving member or the worm shaft member.

First claim

What is claimed is:

1. A motor driven power steering (MDPS) system comprising:
a driving member generating power;
a worm shaft member having a worm gear and rotated while engaged with a worm wheel; and
a coupler member interposed between the driving member and the worm shaft member, and transmitting the power generated from the driving member to the worm shaft member,
wherein the coupler member comprises:
a couple sleeve part surrounding the driving member and the worm shaft member; and
a sleeve pressurizing part surrounding the couple sleeve part and pressurizing the couple sleeve part toward the driving member or the worm shaft member.

2. The MDPS system of claim 1 , wherein the couple sleeve part comprises:
a driving member sleeve surrounding a rotating shaft of the driving member;
a worm shaft sleeve surrounding the worm shaft member; and
a sleeve connection part connecting the driving member sleeve and the worm shaft sleeve.

3. The MDPS system of claim 2 , wherein the sleeve connection part has a transverse cross-sectional surface formed in a polygonal shape.

4. The MDPS system of claim 2 , wherein the driving member sleeve is arranged along the circumference of the rotating shaft.

5. The MDPS system of claim 2 , wherein the worm shaft sleeve is arranged along the circumference of the worm shaft member.

6. The MDPS system of claim 2 , wherein end parts of the rotating shaft and the worm shaft member, inserted into the sleeve connection part, have a transverse cross-sectional surface formed in a polygonal shape.

7. The MDPS system of claim 6 , wherein end parts of the rotating shaft and the worm shaft member, coupled to the coupler member, have a shape of which the transverse cross-sectional surface is narrowed along the direction in which the rotating shaft and the worm shaft member are inserted into the coupler member.

8. The MDPS system of claim 7 , wherein the rotating shaft and the worm shaft member are inserted and coupled to the coupler member.

9. The MDPS system of claim 2 , wherein the sleeve pressurizing part is formed in a ring shape including an elastic material, and seated on the outer circumferential surface of the couple sleeve part so as to pressurize the couple sleeve part toward the rotating shaft or the worm shaft member.

10. The MDPS system of claim 9 , wherein the sleeve pressurizing part is seated in a pressurizing part seating groove formed in a concave shape on the outer circumferential surface of the couple sleeve part.

11. The MDPS system of claim 2 , wherein the driving member sleeve, the worm shaft sleeve, and the sleeve connection part are formed of an elastic material.

12. The MDPS system of claim 11 , wherein the driving member sleeve, the worm shaft sleeve, and the sleeve connection part are integrated with each other.

Assignees

• Hyundai Mobis Co Ltd

Inventors

• Lee Kyung Min

Classifications

• B62D3/04

  of worm type · CPC title

• B62D5/0421 Primary

  Electric motor acting on or near steering gear · CPC title

• F16D3/02 Primary

  adapted to specific functions · CPC title

• F16D3/72

  with axially-spaced attachments to the coupling parts (F16D3/56 takes precedence) · CPC title

• B62D5/0454 Primary

  Worm gears · CPC title