Drive power transmission device

Patent 7004297 Issued on February 28, 2006. Estimated Expiration Date:

August 28, 2023. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Toyoda Koki Kabushiki Kaisha

Application

No. 10649730 filed on 08/28/2003

US Classes:

192/35, Pilot mechanism192/84.7, Mechanical force increasing means192/107M, Material204/192.3, With sputter etching192/84.96, Fixed concentric coil192/84.961, With pulley or gear192/84.951, With pulley or gear427/536, Organic substrate428/408, SELF-SUSTAINING CARBON MASS OR LAYER WITH IMPREGNANT OR OTHER LAYER192/85CAClutch and nonrotating motor

Examiners

Primary: Rodriguez, Saul

Attorney, Agent or Firm

Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

Foreign Patent References

03-292385 EP 12/01/1991
0 810 384 EP 12/01/1997
0 947 720 EP 10/01/1999
2001-295863 JP 10/01/2001

International Class

F16D 13/04

Abstract

A drive power transmission device is disclosed having a drive mechanism for transmitting a drive power between first and second rotary members rotatable relative to each other, by the operation of an electromagnetic type clutch mechanism which brings a friction clutch into connection. A magnetic path generated around an electromagnet of the electromagnetic type clutch mechanism includes a clutch magnetic path in which a magnetic flux passes to reciprocate plural times across th friction clutch, and diamond-like carbon surface treatment is given on a part or all of the friction contact surfaces of the friction clutch to form a hard amorphous carbon film thereon. Thus, the transmission device can be constructed using a smaller number of the outer and inner plates for the electromagnetic type clutch mechanism, so that it can take a small construction with a longer durability life.