Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Reexamination Certificate
1998-09-11
2001-05-01
Bucci, David A. (Department: 3682)
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
C464S068800
Reexamination Certificate
active
06223625
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a torque transmitting and torsion damping apparatus for use in motor vehicles.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 4,727,767 (issued Mar. 1, 1988 to AiKi et aL), U.S. Pat. No. 4,876,917 (issued Oct. 31, 1989 to Aiki et al.), and JP-B 2-35080 U (published Sep. 21, 1990) disclose a torque transmitting and torsion damping apparatus. This known apparatus employs a friction clutch called hysteresis mechanism, which generates friction during relative rotation between a first inertia body including a driving plate and a second inertia body including a flywheel. In the known friction clutch, a pressure plate called hysteresis plate is provided with a bent portion fitted into a bore formed in the driving plate and a cone or Belleville spring acts on the pressure plate. The pressure plate can move in an axial direction along an axis of rotation of the first inertia body since the bent portion can slide relative to the bore. The pressure plate requires bending process to form the bent portion, thereby increasing manufacturing cost. The portion where the bent portion bears stress during relative rotation between the first and second inertia bodies changes when the pressure plate moves as the friction lining of the mechanism wears. This increases moment applied to the bent portion over the extended period of use with the friction lining unchanged. This causes mechanical failure of the bent portion of the pressure plate.
An object of the present invention is to provide a torque transmitting and torsion damping apparatus employing a pressure plate that has no bent portion for engagement with the adjacent inertia body.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a torque transmitting and torsion damping apparatus comprising:
a first inertia body for rotation about an axis;
a second inertia body supported by said first inertia body for relative rotation about said axis to said first inertia body;
a torsion damper between said first and second inertia body for transmission of torque; and
a friction clutch between said first and second inertia body for transmission of torque,
said friction clutch including a spring a friction plate and a pressure plate said pressure plate being disposed between said spring and said friction plate, said spring biasing via said pressure plate said friction plate into frictional engagement with said torsion damper,
said pressure plate being in the form of a flat plate including a wall portion radially extending, with respect to said axis and projections extending outwardly radially, with respect to said axis, from a periphery of said wall portion into engagement with one of said first and second inertia bodies for allowing movement of said pressure plate along said axis.
REFERENCES:
patent: 4727767 (1988-03-01), Aiki et al.
patent: 4876917 (1989-10-01), Aiki et al.
patent: 4932286 (1990-06-01), Fukushima
patent: 5620373 (1997-04-01), Kagiyama et al.
patent: 5688177 (1997-11-01), Lindner
patent: 5771755 (1998-06-01), Duclos et al.
patent: 2-35080 (1990-09-01), None
Ara Hirofumi
Harima Toshio
Ichinose Masato
Shibata Daisuke
Tsuchiya Shoichi
Bucci David A.
Charles Marcus
Foley & Lardner
Unisia Jecs Corporation
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