Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1988-12-02
1990-06-12
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 464 68, 1321062, F16F 1510
Patent
active
049322869
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL USEFUL FIELD
This invention relates to a flywheel assembly having divided flywheels.
BACKGROUND ART
In a flywheel assembly having divided type flywheels; a play 12, a torsion spring 13 and a friction member 14 are disposed in series between a first flywheel 10 and a second flywheel 11, and a friction member 15 generating a hysteresis torque TH is connected in parallel, as illustrated in FIG. 7.
In such structure, as illustrated in FIG. 8, the friction member 14 begins to slip at a torque TL when the torsion spring 13 actuates in a torsion angle range beyond a clearance .epsilon. settled by the play 12 to further increase torsion torque. Accordingly, the friction member 15 always works regardless of the clearance .epsilon.. Such type of structure is shown in Japanese, Published Utility Model Application No. 61-23543 and Japanese Published Patent Application No. 61-223348 and are well known prior art structures.
When a large torsion torque is applied at a low-speed region such as starting the flywheel etc. for example, the second flywheel 11 is apt to generate a resonance. It is necessary to enlarge the hysteresis torque TH of the friction member 15 in order to avoid this resonance. However, such enlargement of hysteresis torque TH is restricted from the standpoint of damper performance so that it can not be enlarged so much. Further, the friction member 14, functioning as a breakage prevention mechanism at time of generation of resonance, works only to an extent of the maximum engine torque TEMAX which is a limit of the slip commencing torque TL, and a slippage is always produced between the first flywheel 10 and the second flywheel 11 when a large fluctuation torque exceeding the slip commencing torque TL is applied so that energy can not be transmitted efficiently.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide a flywheel assembly which can generate a multi-stage friction force according to a torsion angle range of applied fluctuation torque and also can buffer a large torsion torque while maintaining a damper performance.
STRUCTURE OF THE INVENTION
(1) Technical Measure
This invention provides a flywheel assembly, in which a flywheel to which an engine torque is applied is divided into approximately annular first and second flywheels fronting each other so as to leave a space between the flywheels. The first flywheel is secured to a crank shaft of an engine and the second flywheel is carried rotatably in relation to the first flywheel. An approximately annular and inwardly flange-shaped first hub is secured to an outer peripheral part of the first flywheel. An approximately annular and outwardly flange-shaped second hub is secured to an inner peripheral part of the second flywheel at approximately the same plane with the first hub. Two side plates, connected to the second hub, are installed so as to hold the two hubs therebetween. Torsion springs are installed between the first hub and the side plates. An intermediate friction force generation mechanism, which has a first friction member generating a weak friction force in a small torsion angle range and a second friction member generating a medium friction force in an intermediate torsion angle range, is installed between the flywheels in connection with one side plate. A maximum friction force generation mechanism, which has third friction members generating a maximum friction force in a large torsion angle range, is installed between the both side plates and the second hub. A large torsion torque, exceeding a working torsion angle of the intermediate friction force generation mechanism, can be buffered by a large friction force generated by a slide action of the maximum friction force generation mechanism.
FUNCTION
In the same torsion angle, the flywheel assembly generates only a small friction force exerted by the first friction member so that the damper performance does not become worse.
In the intermediate torsion angle, the second friction member prevents the resonance generated between the both fly
REFERENCES:
patent: 4723463 (1988-02-01), Reik et al.
patent: 4724719 (1988-02-01), Werner et al.
patent: 4727970 (1988-03-01), Reik et al.
patent: 4767380 (1988-08-01), Chasseguet et al.
patent: 4782933 (1988-11-01), Jackel et al.
patent: 4790419 (1988-12-01), Loizeau
Kabushiki Kaisha Daikin Seisakusho
Luong Vinh T.
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