192 clutches and power-stop control – Clutches – Axially engaging
Patent
1988-04-01
1989-07-04
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Axially engaging
192 7027, 192 7029, 192 703, 192 30V, 74574, F16F 1512, F16F 1530, F16D 314
Patent
active
048442259
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a flywheel assembly for absorbing engine vibrations.
BACKGROUND ART
Prior hereto, the applicant of the present invention developed the engine vibrator absorbing flywheel described in Japanese patent application No. 60-44298 and corresponding U.S. patent application Ser. No. 836,365, now U.S. Pat. No. 4,751,993, dated June 21, 1988, and West Germany patent application No. P 36 07 3989-13 which are based on the Japanese patent application No. 60-44298.
In such prior flywheel, as shown in FIG. 5 hereof, a first flywheel 104 is fastened to an engine crank shaft 100 and engaged and disengaged by a clutch disc 102; a second flywheel 106 is installed concentrically with the first flywheel and set to a specified mass; a damper mechanism 108 resiliently couples the flywheels to each other; and, a friction damping mechanism 105 transmits output from the second flywheel 106 to spline hub 103 of the clutch disc 102 and damps vibration only when the clutch disc 102 contacts the first flywheel 104.
As shown in FIG. 6 hereof, the first flywheel 104 and second flywheel 106 absorb vibration transmitted from the crank shaft 100 with power, and the frictional damping mechanism 105 damps the vibration.
However, in such prior flywheel assembly hysteresis torque Thd generates between the hub flange 103 of the clutch disc 102 and the side plate 109 (FIG. 5). In some cases, the hysteresis torque Thd have an undesirable influence upon damping characteristics.
Further, the damping function of the frictional damping mechanism 106 for the second flywheel 106 comes to a stop, during clutch releasing operation in which the clutch disc 102 is disconnected from the first flywheel 104. It is possible that the second flywheel will have a resonance phenomenon depending on the frequency of the inputted vibration.
Disclosure of the Invention
An object of the present invention is to provide a flywheel assembly which can prevent the generation of hysteresis torque in a clutch equipped with a pull lever for engage/disengage operation.
Composition of the Invention
(1) Technical measure
The present invention relates to a flywheel assembly including a first flywheel fixed to a crank shaft of an engine and a second flywheel installed concentrically with the first flywheel, the mass of the second flywheel being set to specified mass. A damper mechanism is resiliently connects the flywheels with each other. A pressing plate is fixed to the first flywheel and is disposed to opposite the first flywheel and at a distance apart from the first flywheel. A clutch disc is installed to engage/disengage a face of the pressing plate opposite to the first flywheel. A pressure plate for the clutch disc engaging operation is provided between the clutch disc and the first flywheel. A spring member is provided to be shortened between the pressure plate and the first flywheel. A release lever is provided to be supported on the pressing plate, and so as to press the pressure plate toward opposite direction of the pressing plate against a spring force of the spring member in clutch releasing mode. A friction damping mechanism is provided to transmit power of the second flywheel to a spline hub of the clutch disc in clutch engaging mode. To restrict vibration of the second flywheel by the second flywheel, a friction damping mechanism is engaged between the first and second flywheel in clutch releasing mode.
(2) Function
The clutch disc engages/disengages the pressing plate. An axial pressure force of the clutch disc does not generate, and a hysteresis torque does not generate in the clutch disc, because the engage/disengage operation of the clutch disc is operated by pull-operation of the release lever.
In clutch releasing mode, the pressure plate restricts vibration of the second flywheel through the friction damper mechanism. The resonance phenomenon is prevented.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial vertical sectional view of a clutch applied with the present invention;
FIG. 1a is a partial view o
REFERENCES:
patent: 2822071 (1958-02-01), Hautzenroeder
patent: 4751993 (1988-06-01), Fukushima
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
Testardi David A.
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