Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1986-01-06
1987-07-21
Smith, Gary L.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
464 89, F16F 1512
Patent
active
046809848
DESCRIPTION:
BRIEF SUMMARY
The invention relates to torsional vibration dampers, especially for motor vehicles, comprising a support which has fastening spots for mounting at a shaft flange and the like, a flywheel arranged coaxially with the support and radially spaced from the same, and a plurality of spring elements disposed circumferentially spacedfrom one another between the support and the flywheel and interconnecting the two.
In a known torsional vibration damper of this kind (DE-B- No. 2 508 212) the support is a stamped sheet metal member having the shape of a rounded equilateral triangle the corners of which, serving as fastening spots, are formed with a through bore for a screw. The flywheel is embodied by a circular ring which encloses the support at relatively small radial spacing from the rounded corners thereof. The space between the support and the flywheel is substantially filled with rubber which is subdivided into individual spring elements by slots in the range of the rounded corners of the support and by recesses in the central range of the longitudinal sides of the support.
It is difficult in manufacturing this known torsional vibration damper to maintain a given characteristic frequency with sufficient accuracy. Manufacturers of motor vehicles into which such torsional vibration dampers are installed, for example, prescribe a characteristic frequency of 60 Hz at tolerance limits of no more than .+-.4 Hz. The characteristic frequency of a torsional vibration damper of the generic kind in question among others depends on the nature of the spring elements. Usually these are made of rubber whose hardness suffers variations by which the tolerance limit mentioned of the characteristic frequency can be maintained with great difficulty only. Moreover, the known torsional vibration dampers of the kind described tend to vibrate radially and tumble, undergoing vibrations which, at best, can be minimized but not suppressed altogether because of close dimensions of the slots between the rounded edges of the support and the flywheel.
In another torsional vibration damper (DE-A- No. 2 455 385) a hub member is connected torsionally elastically by radial spokes to an outer member surrounding the hub member like a ring and carrying a flywheel, and elastomer bodies are received in corresponding recesses of the hub member and of the outer member. The elastomer bodies either are cylindrical or shaped like rectangular prisms and, in both cases, tightly enclosed by the recesses, whereby torsional vibrations can be damped only by deformations of the elastomeric bodies.
Elastomer bodies damping torsional vibrations in similar manner are known in connection with elastic couplings (DE-B- No. 1 008 063 and DE-B- No. 1 067 644). These elastomer bodies must transmit the full operating torque from one clutch half to the other.
With all of these known arrangements the elastomeric bodies are subjected to heavy stress and they cannot prevent the structural members which are torsionally vibrating with respect to each other from making radial and tumbling relative motions.
It is, therefore, the object of the invention to develop a torsional vibration damper of the kind specified initially such that a given characteristic frequency can be maintained within closer limits than before and the tendency of vibrating radially and tumbling can be eliminated practically completely.
This object is met, in accordance with the invention, in that rolling curves of rubber-elastic material are arranged at the support and flywheel between which curves rigid rolling bodies are supported under radial bias, and matching rolling curves are formed so as to converge in circumferential direction at both sides of the corresponding rolling body, being formed by a layer of the rubber-elastic material which becomes progressively thicker in circumferential direction toward both sides
In accordance with the invention each individual rolling body adopts a defined central position when at rest. Any excursion of the flywheel in circumferential direction with respect to the sup
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Wahling Werner
Ziegler Gunther
Lindsey Rodney M.
SGF - Suddeutsche Gelenkscheibenfabrik GmbH & Co. KG
Smith Gary L.
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