192 clutches and power-stop control – Clutches
Patent
1988-03-04
1989-07-11
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
192 7017, 74574, F16F 1530
Patent
active
048463230
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a flywheel assembly adapted to aborb or damp vibration in power supplied thereto.
BACKGROUND OF THE INVENTION
A flywheel assembly of this type is disclosed in my commonly assigned Japanese laid open patent publication No. 61-201948(Appin. No. 60-44298) and corresponding U.S. patent application Ser. No. 836,365, now U.S. Pat. No. 4,751,993.
In the disclosed assembly, there is provided, as illustrated in FIG. 3, a first flywheel 101, with which a clutch disk 100 is frictionally engageable, fixed to a crank shaft of an engine, a second flywheel 102 concentrially positioned within the first flywheel 101 and having an appropriate mass, an elastic damper mechanism 103 elastically connecting the flywheels to each other and a first frictional damper mechanism 105, which is operable to connect the second flywheel 102 with a splined hub 104 of the clutch disk 100 when the clutch disk 100 engages with the flywheel 101.
Although this assembly can effectively absorb or damp the vibration in the transmitted power, it has such a disadvantages that the first and second flywheels may resonate when the clutch disk 100 is disengaged.
Accordingly, it is an object of the present invention to provide a flywheel assembly which can effectively absorb the vibration in the transmitted torque and can prevent the resonance of the flywheels when the clutch is disangaged.
DISCLOSURE OF THE INVENTION
In the present invention, a flywheel assembly comprises a first input flywheel; a clutch disk connected to an output shaft and adapted to selectively engage with the first flywheel; a second flywheel concentrically and rotatably arranged with respect to the first flywheel and having a predetermined mass; and elastic damper connecting both flywheels together; a first frictional damper mechanism adapted to operate between the second flywheel and the clutch disk only when the clutch disk is engaged with the first flywheel; and a second frictional damper mechanism adapted to operate between both flywheels only when the clutch disk is released from the first flywheel.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional view of an embodiment of the invention;
FIG. 1a is a graph of damping characteristics;
FIG. 1b is a schematic view illustrating a principle of the embodiment in FIG. 1;
FIG. 2 is a partial sectional view of another embodiment; and
FIG. 3 is a sectional view of an assembly of my Japanese patent application .
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, a substantially circular first flywheel 12 is fixed to an end of a crank shaft 10 of an engine by bolts 10a. The flywheel 12 has an annular surface 12a frictionally engageable with a facing 16 of a clutch disk 14. A clutch cover 18 is fixed to the flywheel 12. The clutch cover 12 supports a diaphragm spring 22 for biasing a pressure plate 24 through wire rings 20.
At a side of the flywheel 12 opposite to the facing 16, an annular second flywheel 26 is disposed concentrically and rotatably to the flywheel 12. The second flywheel 26 is integrally provided at a radially outer portion with an annular weight 26a so as to determine a mass of the flywheel 26 appropriately with taking an inertial mass of a drive system in a subsequent transmission (not shown) and others into consideration. A ball bearing 27 is interposed between the flywheels 12 and 26. A bearing support 27a is associated to the bearing 27 and is fixed to the flywheel 26 by bolts 27b.
The flywheel 26 is provided at the radially middle portions with circumferentially spaced openings 26b in which damper springs 28 are fitted for elastically interconnecting the flywheels 12 and 26 with each other. Preferably, four such openings 26b are provided.
A pair of side plates 30 and 32 are disposed at opposite sides of the flywheel 26 and are rigidly connected together by stop pins (not shown). The side plate 32 adjacent to the flywheel 12 is fixed at the radially inner portion to the flywheel 12 by bolts 34. The side plates 30 and 32 are provided w
REFERENCES:
patent: 4624351 (1986-11-01), Lutz et al.
patent: 4638684 (1987-01-01), Maucher
patent: 4751993 (1988-06-01), Fukushima
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
Testardi David A.
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