Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1989-11-08
1991-03-05
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 192 7017, 192 7027, 464 68, F16F 1510
Patent
active
049968920
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a flywheel assembly having a transmission mechanism for absorbing vibration torque of an engine.
BACKGROUND ART
A flywheel assembly disclosed e.g. in the Japanese Examined Patent Publication No. 60-1497 is well known as a prior art.
The prior art including a first flywheel fastened to a crank shaft, a second flywheel aligned with the first flywheel, and torsion spring mechanism and torque limiting mechanism disposed between the first and second flywheels. In the arrangement, the torque limiting mechanism has narrow friction surface so that a transmitted torque is small. Thus, the prior arrangement can not be employed for heavy duty vehicles such like a truck, a bus, or the like.
Accordingly, it is an object of the present invention to provide a flywheel assembly having a torque limiting mechanism and is used for heavy duty vehicles such like a truck, a bus, or the like.
SUMMARY OF THE INVENTION
The present invention relates to a flywheel assembly which including a substantial annular first flywheel connected to a crank shaft, a second flywheel concentrically rotatably aligned with the first flywheel, a torsion spring mechanism and a torque limiting mechanism installed in a space formed between the first and second flywheels. The torsion spring mechanism is located at an outer peripheral portion of the space. Sub-plates of the torsion spring mechanism are connected to the first flywheel. Torsion springs provided with distances therebetween in a circumferential direction are disposed between the sub-plates. The torque limiting mechanism is located at inner peripheral portion of the space. The torque limiting mechanism has a substantial annular holder which has an inner peripheral boss connecting to the second flywheel and a drum which has a substantial annular friction portion aligning with the second flywheel and a cylindrical portion integrally extending from an outer periphery of the friction portion having an edge surrounding the holder. A substantial annular first friction plate is concentrically disposed between a flange of the holder and the friction portion. The first friction plate has an outer peripheral portion which forms claws fitted in the recesses formed in the cylindrical portion. A substantial annular driven plate is disposed between the first friction plate and the friction portion. Claws are integrally projecting from circumferentially spaced places of an outer periphery of the driven plate to radial outwardly through the recesses of the cylindrical portion and are abutting on the torsion springs. An annular second friction plate is disposed between the driven plate and the friction portion. Claws are integrally projecting from circumferentially spaced places of an inner periphery of the second friction plate to radial inwardly through recesses formed in the boss. An annular first friction material is disposed between the flange and first friction plate. An annular second friction material is disposed between the driven plate and the second friction plate. An annular third friction material is disposed between the second friction plate and the friction portion of the drum. An annular fourth friction material is disposed between the friction portion and an end surface of the second flywheel. A Belleville spring is disposed between the first friction plate and the driven plate for generating urging force generated between the friction materials and abutting surfaces.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical sectional view of the present invention.
FIG. 2 is a partial perspective view of a drum and driven plate of the present invention.
FIG. 3 is a graph showing torsion angle-torque characteristic.
BEST MODE FOR CARRYING OUT THE INVENTION
In FIG. 1, which shows a clutch applied with the present invention, left side of the figure is regarded as front.
Referring in FIG. 1, numeral 10 is a flywheel assembly which is including a first flywheel 11, a second flywheel 12, a torsion spring mechanism 13, and a torque limiting mechanism 14. The flywhe
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patent: 4790419 (1988-12-01), Loizeau
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patent: 4904226 (1990-02-01), Chasseguet et al.
Kabushiki Kaisha Daikin Seisakusho
Luong Vinh T.
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