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, 1921062, 74574, F16F 1512, F16F 1530, F16D 314
Patent
active
048442240
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a flywheel assembly for absorbing vibration.
BACKGROUND ART
The applicant of the present invention has prior hereto developed a flywheel assembly and has filed Japanese patent application No. 60-44298 and corresponding copending 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 thereon.
In prior development, as shown in FIG. 4, a first flywheel 104 fastened to an engine crank shaft 100 and engaged and disengaged by a clutch disc 102 a second flywheel 106 installed concentrically with the first flywheel and set to a specified mass, a damper mechanism 108 resiliently coupling the both flywheels, and a friction damping mechanism 105 which transmits an output from second flywheel 106 to a spline hub 103 of the clutch disc 102 and damps its vibration only when said clutch disc 102 contacts with the first flywheel 104.
As shown in FIG. 5, the first flywheel 104 and second flywheel 106 absorb an vibration which transmits from the crank shaft 100 with an power, and the frictional damping mechanism 105 damps the vibration.
However, hysteresis torque Thd generates between the hub flange 103 of the clutch disc 102 and the side plate 109 (FIG. 4). In some cases, the hysteresis torque Thd have an undesirable influence upon damping characteristics.
Further, a damping function of the frictional damping mechanism 106 for the second flywheel 106 comes to a stop, during clutch releasing operation while the clutch disc 102 is disconnected from the first flywheel 104. There is a possibility that the second flywheel will have a resonance phenomenon depending upon the frequency of the input vibration.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a flywheel assembly which can prevent generation of hysteresis torque in a clutch disc equipped with an ordinary diaphgram spring for engage/disengage operation.
COMPOSITION OF THE INVENTION
(1) Technical measure
The present invention relates to a flywheel assembly which 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 is set to specified mass. A damper mechanism resiliently connects both flywheel. A friction damping mechanism transmits output power of the second flywheel to a spline hub of the clutch disc only when the clutch disc is connected with the first flywheel. The first flywheel is comprised of a separated supporting plate and a friction plate. The supporting plate connected to the crank shaft. The friction plate connects to the supporting plate in circumferential direction and is provided to slide axially on the supporting plate. A return spring presses the friction plate toward the clutch disc direction and is provided between the supporting plate and the friction plate. The friction damping mechanism comprised a holder connected to the second flywheel, a damper plate held by the holder and slide axially by said friction plate. A friction disc is connected to the spline hub of the clutch disc. The friction plate is pressed by the damper plate. A spring member presses the damper plate toward pressing direction of the friction disc. In the clutch engaging mode, when the friction plate presses the supporting plate against the spring force of the return spring, an output power from the second flywheel transmits to the spline hub of the clutch disc to press the damper plate onto the friction plate by the spring member of the friction damping mechanism. In clutch releasing mode when the friction plate moves toward it opposite direction to the supporting plate side by the spring force of the return spring, the damper plate slides toward releasing direction of the friction disc against the spring force of the spring member corresponding to a return operation of the friction plate and connects the second flywheel and the friction plate through the friction damping mechanism.
(2) Function
An
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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