192 clutches and power-stop control – Clutches – Operators
Reexamination Certificate
2009-10-06
2011-12-20
Lorence, Richard M. (Department: 3655)
192 clutches and power-stop control
Clutches
Operators
C192S085450
Reexamination Certificate
active
08079454
ABSTRACT:
The friction engagement apparatus comprises a case forming part of a power transmission apparatus, a plurality of friction plates splined to the case, a plurality of friction plates splined to a rotation element, an annular piston having a cylindrical wall portion imparting the urging pressure to the friction plates, an urging device having a return spring intervening between the case and the piston to urge the piston in one axial direction, the cylindrical wall portion having a first pressure receiving section formed with a cut-off recession, and a second pressure receiving section formed with no cut-off recession, and the return spring being coaxially arranged with the piston and having a bending stiffness in the axial direction with respect to a circumferential unit length, the bending stiffness in the first pressure receiving section being larger than the bending stiffness in the second pressure receiving section.
REFERENCES:
patent: 3848518 (1974-11-01), Martin
patent: 6786843 (2004-09-01), Mizuno
patent: 7107867 (2006-09-01), Miyazaki et al.
patent: 7513351 (2009-04-01), Onishi et al.
patent: 2010/0032260 (2010-02-01), Harashima et al.
patent: S56149143 (1980-04-01), None
patent: S60-138039 (1985-09-01), None
patent: S61-023537 (1986-02-01), None
patent: 05033835 (1993-02-01), None
patent: 11280791 (1999-10-01), None
patent: 2000081118 (2000-03-01), None
patent: 2002-206598 (2002-04-01), None
patent: 2003106427 (2003-04-01), None
patent: 2004-156757 (2004-06-01), None
patent: 2006144879 (2006-06-01), None
patent: 2007-170440 (2007-07-01), None
patent: 2007-170442 (2007-07-01), None
patent: 2008038945 (2008-02-01), None
patent: WO 2008132586 (2008-11-01), None
Office Action from Japanese application No. 2008-261757 dated Dec. 7, 2010 with declaration; 6 pages.
Gifford Krass Sprinkle Anderson & Citkowski P.C.
Lorence Richard M.
Toyota Jidosha & Kabushiki Kaisha
LandOfFree
Friction engagement apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Friction engagement apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Friction engagement apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4315032