Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1991-06-06
1994-04-05
Herrmann, Allan D.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
F16F 1512
Patent
active
052994686
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to vibration dampers particularly for use on engines or transmissions adapted to drive motor vehicles.
2. Related Art
Internal combustion engines experience torsional vibrations due to non uniform loading of the crankshaft from the cylinder pressure and the reciprocating parts of the engine. If the vibration becomes severe enough to damage the crankshaft or the accessories driven by the crankshaft, either the crankshaft must be redesigned or a method of controlling the vibration must be used. Elastomeric dampers may be used to reduce torsional, axial or bending vibration to an acceptable level. Elastomeric dampers behave like a combination of a tuned absorber and an energy dissipator. The tuning effect of the damper is achieved by the proper balance of elastomer stiffness and the inertia of the damper ring, while the energy dissipation is primarily determined by the inherent damping of the elastomer. Typically the damper may include a hub part adapted to be rigidly attached to the rotational shaft requiring damping, an outer inertia ring and an elastomeric material ring separating the ineretia ring from the hub part. An example of the foregoing type of vibrational damper is shown in Australian Patent Application No. 83399/87. Other examples are shown in Australian Patent Nos. 578170, 578846, 63868/86, 255913 and U.S. Pat. Nos. 1,944,233 and 4,710,152. There is also a growing tendency to drive vehicle accessories off the crankshaft of engines and when an elastomeric damper is mounted thereon, it is necessary to drive the accessories from the intertia ring of the damper. The foregoing would not apply where the shaft requiring balancing is in the transmission. This, to some extent has some disadvantageous effects on the performance of the damper.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide improved designs of elastomeric dampers capable of damping torsional vibrations or torsional and bending vibrations which may be produced efficiently and which are safe and effective in operation. A further preferred aim of the invention is to provide a damper construction that enables accessories to be driven therefrom but which separates the vibration control function from the accessories drive function.
In accordance with a first aspect of the present invention there is provided an elastomeric damper comprising a hub section adapted for connection to a rotational shaft requiring balancing in an internal combustion engine, said hub section including a radially extending portion and an axially extending portion adjacent said radially extending portion, an annular inertia ring located inwardly of said axially extending portion and an elastomeric material arranged between an outer circumferential surface of said inertia ring and an inwardly directed circumferential surface of said axially extending portion, and a radially inwardly deformed section located on said axially extending portion at a position spaced from said radially extending portion clamping said inert ring in position separated from said hub section by said elastomeric material. Conveniently said hub section is formed by pressing, rolling or otherwise deforming material (preferably steel) plate.
In accordance with a second aspect of the present invention there is provided an elastomeric damper comprising a hub section adapted for connection to a rotational shaft requiring balancing in an internal combustion engine, said hub section including a radially extending portion and an axially extending portion adjacent said radially extending portion, an annular inertia ring located inwardly of said axially extending portion and an elastomeric material arranged between an outer circumferential surface of said inertia ring and an inwardly directed circumferential surface of said axially extending portion, said elastomeric material being preformed to include an axially extending part and at least one radial extending part located between the inertia ring an
REFERENCES:
patent: 1944233 (1934-01-01), Hann
patent: 2594555 (1952-04-01), Hardy
patent: 4710152 (1987-12-01), Ichikawa et al.
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