192 clutches and power-stop control – Clutches – Operators
Patent
1989-11-01
1991-04-02
Bonick, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 7017, 464 68, F16D 314
Patent
active
050040880
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a torsional vibration damper and more particularly to a rotary coupling device comprising the damper to damp out torsional or rotary vibrations superimposed on a rotary motion input to the coupling so that a rotary motion output from the coupling may be free of said vibrations or at least they may be reduced.
The rotary coupling device is of a type (hereinafter called the "type referred to") intended for rotation about an axis and comprising a first component part and a second component part each rotatable about the axis and also capable of a rotation one relative to another about said axis, a plurality of compression spring means disposed between the first and second component parts, said spring means being capable of transmitting rotary motion from one said component part to the other, and each said spring means being compressible along a circumferential direction (with respect to the rotation about said axis) by relative rotary movement between said first and second component parts.
Each spring means can be of any suitable, compressible, elastically deformable kind, for example a helical spring or a rubber cushion.
One example of a coupling device of the type referred to is a driven plate for a friction clutch. In the driven plate one said component part is formed by an annular array of friction material on a disc-like carrier plate and the other said component part is a disc-like flange axially spaced from the carrier plate. That flange either has a central aperture lined with axial splines or is rotationally fast with a hollow hub lined internally by axial splines, said splines being to mesh with axial splines on a shaft. The carrier plate and flange each have windows containing said spring means. The driven plate is included in a clutch provided with a pressure plate arranged to releasably clamp the driven plate against a rotatably driven counter-pressure plate. That counter-pressure plate may be driven by an engine of a motor vehicle and can be the fly-wheel of the engine. Therefore said shaft may be an input shaft to a gearbox in a transmission of the vehicle.
Another example of a coupling device of the type referred to is a divided or split fly-wheel in which said first component part is a first fly-wheel arrangement axially spaced from the second component part formed by a second fly-wheel arrangement, the two fly-wheel arrangements being interconnected using said plurality of spring means. A split fly-wheel as aforedescribed may be used as a fly-wheel of a motor vehicle engine. One of said fly-wheel arrangements can form a counter-pressure plate of a clutch whilst the initial rotary drive is input to the other fly-wheel arrangement. An example of such a split fly-wheel is described in published British Patent Application GB 2166 220 A.
In known coupling devices of the type referred to, the relative rotation between said first and second components is a function of the rates of the respective spring means and the value of the driving input torque applied to one of said first or second components when the other component experiences retardation caused by inertia and friction Often the various spring means are arranged so that one or more have low spring rates and one or more have higher rates. The arrangement is that the spring means are staggered so that the initial relative rotary movement between the first and second components compresses the low rated spring means until the torque input reaches a value where the low rated spring means have allowed a sufficient relative movement between the first and second components, that the respective higher rated spring mean start to be compressed.
An object of the invention is to provide a coupling device of the type referred to capable of being constructed to increase the input torque range over which lower spring rate torsional vibration damping is available.
According to the invention, there is provided a rotary coupling device of the type referred wherein there are at least first and second said spring means so arranged that
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Automotive Products plc
Bonick Rodney H.
Pitts Andrea
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