Coupling with tribological coating system

Details Coupling with tribological coating system Coupling with tribological coating system

2002-12-20

2003-11-04

Novosad, Christopher J. (Department: 3671)

Joints and connections

Utilizing thermal characteristic, e.g., expansion or...

Interposed material of intermediate coefficient of expansion

C403S030000, C403S204000, C403S359100, C403S404000

Reexamination Certificate

active

06641322

ABSTRACT:

TECHNICAL FIELD
This invention relates to couplings for rotating components such as an electric generator shaft and a gearbox and in particular to a tribological coating system for use on such couplings.
BACKGROUND OF THE INVENTION
FIGS. 1A and 1B
show typical components of a coupling assembly for coupling an electric generator shaft to a gearbox. The assembly includes a sleeve
10
having an axially extending portion
12
and a flange portion
14
. The axially extending portion
12
has a generally square cross-section with the four corners beveled. The axially extending portion
12
is inserted into a hollow section of an electric generator shaft having the same cross-sectional shape. Also part of the assembly is a drive shaft
20
. The drive shaft
20
has a splined portion
22
for engaging corresponding splines in a gearbox. It also has an axially extending shaft portion
24
shaped and sized to be inserted into the sleeve
10
.
During prolonged usage at high speeds and temperatures, this prior art coupling assembly will experience wear on the contacting surfaces. This wearing may result in the binding of the shaft portion
24
and/or the tearing of the sleeve
10
.
Accordingly, there exists a need for a coupling assembly having a tribological system that can operate at high temperatures and speed.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a coupling assembly having a tribological system that can operate at high temperatures and speed.
The present invention achieves this object by providing a coupling with a tribological system that can withstand temperatures up to 600° C. The coupling includes a shaft having an outer surface with a layer of chromium and a sleeve for receiving the shaft. The sleeve has an inner surface coated with a layer of silver or gold. The silver or gold layer contacts the chromium layer to form the tribological system.
These and other objects, features and advantages of the present invention are specifically set forth in or will become apparent from the following detailed description of a preferred embodiment of the invention when read in conjunction with the accompanying drawings.


REFERENCES:
patent: 1753773 (1930-04-01), Champion
patent: 2200129 (1940-05-01), Whiteford
patent: 2676279 (1954-04-01), Wilson
patent: 2763141 (1956-09-01), Dodge
patent: 2855769 (1958-10-01), Garnier
patent: 3329452 (1967-07-01), Ammon
patent: 3712338 (1973-01-01), Bucalo
patent: 3922044 (1975-11-01), Bucalo
patent: 4009027 (1977-02-01), Naidich et al.
patent: 4491082 (1985-01-01), Barch et al.
patent: 4747722 (1988-05-01), Kawaguchi et al.
patent: 4781799 (1988-11-01), Herbert, Jr. et al.
patent: 5013948 (1991-05-01), Tumpey et al.
patent: 5087146 (1992-02-01), Motzet et al.
patent: 5108025 (1992-04-01), Kang et al.
patent: 5514926 (1996-05-01), Bushman
patent: 5523635 (1996-06-01), Ferreira et al.
patent: 5524342 (1996-06-01), Swain et al.
patent: 5660482 (1997-08-01), Newley et al.
patent: 5856645 (1999-01-01), Norton
patent: 5861692 (1999-01-01), Furlani et al.
patent: 5912916 (1999-06-01), Hendrix
patent: 6124767 (2000-09-01), Woods
patent: 6141856 (2000-11-01), Johnson et al.
patent: 6296084 (2001-10-01), Trustee
patent: 6324821 (2001-12-01), Bauer et al.
patent: 6362708 (2002-03-01), Woods
patent: 6378874 (2002-04-01), Dorulla
patent: 6447970 (2002-09-01), Matsunaga et al.
patent: 6494824 (2002-12-01), Apple et al.
H. Kong and M. F. Ashby; Wear Mechanisms In Brittle Solids; Pergamon Journals Ltd; Mar. 4, 1992; Great Britain.
S.C. Lim and M. F. Ashby; Overview No. 55, Wear-Mechanism Maps; Pergamon Journals Ltd; Mar. 10, 1986; Great Britain.

Affiliated with

Also associated with

Rating

Coupling with tribological coating system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Coupling with tribological coating system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coupling with tribological coating system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3175637