Rack bar unit of vehicle steering device

Patent metadata

Field	Value
Publication number	US-9744985-B2
Application number	US-201514885204-A
Country	US
Kind code	B2
Filing date	Oct 16, 2015
Priority date	Feb 17, 2015
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A rack bar unit of a vehicle steering device may include a rack bar body and a rack gear made of different materials, in which the rack gear may be coupled to the rack bar body.

First claim

What is claimed is:

1. A rack bar unit of a vehicle steering device, the rack bar unit comprising:
a rack bar body and a rack gear made of different materials,
wherein the rack gear is coupled to the rack bar body,
wherein the rack bar body comprises:
a hollow pipe shaped body part which is vacant therein, and
a coupling part integrally formed in the body part and coupled to the rack gear,

wherein the coupling part has a same diameter as the body part and is cut in an axial direction to have a semi-circular shape, and
wherein a coupling space having a predetermined size, which the rack gear is inserted into and coupled to, is formed between a flat plane of the coupling part and an outer peripheral surface of the body part, and
wherein:
a circular boss is integrally formed at one axial end of the coupling part to restrict the coupling space,
a through fastening hole is formed at the boss, and

a receiving space is formed in the boss.

2. The rack bar unit of claim 1 , wherein the rack bar body is formed by a magnesium alloy casting process.

3. The rack bar unit of claim 1 , wherein the rack gear is manufactured by a forging press process with high-carbon chrome steel.

4. The rack bar unit of claim 1 , wherein the rack bar body and the rack gear are detachably coupled to each other.

5. The rack bar unit of claim 1 , wherein:
the rack gear and the rack bar body are fixedly fastened to each other by a fastening bolt fastened through the fastening hole,
the fastening bolt is fastened through a fastening plate having a disk shape, and
the fastening plate is inserted into and received in the receiving space.

6. The rack bar unit of claim 5 , wherein:
the rack gear has a structure in which multiple rack gear teeth are formed at a predetermined interval in a longitudinal direction thereof, and
the rack gear includes semi-circular shaped bosses at both ends thereof, and is fastened with the fastening bolt while a first boss contacts a boundary surface between the body part and the coupling part and a second boss contacts a boss of the rack bar body.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Ryu Sang Woock

Classifications

• F16H55/26 Primary

  Racks · CPC title

• B62D3/126 Primary

  characterised by the rack · CPC title