192 clutches and power-stop control – Clutches – Operators
Patent
1988-07-27
1990-05-15
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
1921061, 192 7017, 464 68, F16D 314
Patent
active
049249908
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a damper disc for preventing three kinds of vibrations generated in a vehicle, such as an idle rattle, a driving rattle and a low frequency abnormal vibration (tip-in & tip-out).
BACKGROUND ART
When a damper disc is used for an automobile clutch disc, it is preferable to prevent three kinds of vibrations such as the idle rattle, the driving rattle and the low frequency abnormal vibration (tip-in and tip-out). In a conventional clutch disc, however, it has been difficult to prevent these three kinds of vibrations simultaneously.
For example, the applicant of the present invention has conventionally developed a clutch disc (Japanese Published Patent Application No. 61-40847), in which a disc-like hub flange of a spline hub has been divided into an inner peripheral part and an outer peripheral part, a weak torsion spring has been installed in the inner peripheral part, strong torsion springs have been installed in the outer peripheral part, so that the weak spring is made to function for a small torsion angle range and the strong springs are made to function for a large torsion angle range. However, this prior art has been effective for the idle rattle and the driving rattle but ineffective for the low frequency abnormal vibration. Further, in a clutch disc (Japanese Patent Application No. 60-44300, Patent Publication No. 61-201933) wherein a first friction material provided with a high friction coefficient and a second friction material provided with a low friction coefficient have been installed to increase or decrease a hysteresis torque according to a torsion angle, it has been possible to prevent the driving rattle and the low frequency abnormal vibration but impossible to prevent the idle rattle.
Moreover, the applicant of the present invention has also developed a disc clutch (Japanese Patent Application No. 58-82319, Patent Publication No. 59-208226) wherein a key has been installed between an inner peripheral side flange and an outer peripheral side flange of said Published Patent Application No. 61-40847 so that the key can be freely connected or disconnected according to a torsion angle. However, a technical measure to utilize this disconnectable key for preventing the three kinds of vibrations has not been disclosed in this prior art.
An object of this invention is to provide a damper disc which can exert a low torsional rigidity in a small torsion angle and a large torsional rigidity in a large torsion angle, has a small hysteresis torque characteristic within a working range of fine angle and a large hysteresis torque characteristic within a working range of large angle, and can exert a large hysteresis torque characteristic for a high torsional angular velocity even within a fine working angle.
DISCLOSURE OF THE INVENTION
In a damper disc according to the present invention; a hub flange of a spline hub is divided into an inner peripheral side flange provided with hub and an outer peripheral side flange which are meshed with each other with a circumferential clearance left therebetween. Annular sub plates holding the flanges are installed on opposite sides of the flanges. A weak torsion spring is interposed in a rectangular hole provided at a position where the sub plates face on the inner peripheral side flange, inner peripheral parts of the sub plates are pressed on opposite side faces of the inner peripheral side flange. A retaining plate and a clutch plate are provided on outside faces of the sub plates opposite to the flange through a first friction material having a high friction coefficient, an intermediate member and a second friction material having a low friction coefficient. In turn, the retaining plate and the clutch plate are coupled by a stop pin at an outer peripheral part so as to compress both friction materials. Claws of the intermediate material fit into holes of the retaining plate and the clutch plate in such a manner that the claws can move freely in a circumferential direction within a specified torsion angle. Strong torsion
REFERENCES:
patent: 4396103 (1983-08-01), Loizeau
patent: 4526260 (1985-07-01), Schierling
patent: 4533031 (1985-08-01), Nagano
patent: 4537297 (1985-08-01), Davies
patent: 4545473 (1985-10-01), Alas
patent: 4563165 (1986-01-01), Takeuchi
patent: 4614261 (1986-09-01), Takeuchi
patent: 4643287 (1987-02-01), Lech, Jr.
Bonck Rodney H.
Kabushiki Kaisha Daikin Seisakusho
Pitts Andrea
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