Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1994-05-23
1996-09-24
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 464 68, 192 30V, F16F 1510
Patent
active
055579841
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a twin mass flywheel arrangement for absorbing or compensating for torsional vibrations such as can arise in a vehicle transmission assembly.
BACKGROUND OF THE INVENTION
More particularly, the invention relates to a twin mass flywheel of the type described in WO 89/01097 in which two coaxial flywheel masses which are mounted fop limited angular rotation relative to each other; and a plurality of pivotal linkages interconnect the two flywheel masses each comprising, a first link pivotally connected one of the flywheel masses, and a second link pivotally connected to the other of the flywheel masses, and means for pivotally connecting the first and second links.
A friction damping means, may be used to resist relative angular rotation between the two flywheel masses.
The present invention provides an improved friction damping means between the flywheel masses.
SUMMARY OF THE INVENTION
According to the invention there is provided a twin mass flywheel for a vehicle comprising two co-axially arranged flywheel masses which are mounted for limited angular rotation relative to each other; and a plurality of pivotal linkages interconnecting the two flywheel masses each linkage comprising a first link pivotally connected to one of the flywheel masses, a second link pivotally connected to the other of the flywheel masses, and a pivot for pivotally connecting the first and second links, said linkage showing a greater mass adjacent the pivot means to that centrifugal force will cause the pivot means to move radially outwardly, and a friction damping means which in use resists relative angular rotation between the two flywheel masses, and provides a variable hysteresis friction damping means whose resistance to said rotation changes as the relative angle of rotation is altered, characterised in that at least one of the flywheel masses has cushioning means thereon to engage directly against the other of the flywheel masses at the limit of relative rotation in at least one direction of relative rotational movement.
Also according to the invention there is provided a twin mass flywheel for a vehicle comprising two co-axially arranged flywheel masses which are mounted for limited angular rotation relative to each other; and a plurality of pivotal linkages interconnecting the two flywheel masses each linkage comprising a first link pivotally connected to one of the flywheel masses, a second link pivotally connected to the other of the flywheel masses, and a pivot means for pivotally connecting the first and second links, said linkage having a greater mass adjacent the pivot means so that centrifugal force will cause the pivot means to move radially outwards, and in each linkage one of said links has an increased mass and acts as a bob weight and each bob weight has a cushioning means thereon to act against at least one of the flywheel masses to cushion any impacts between the bob weight and said flywheel masses.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the present invention and to show more clearly how to carry it into effect reference will now be made, by way of example, to the accompanying drawings in which:
FIG. 1 a cross-sectional view of one embodiment of a twin mass flywheel according to the present invention taken along the line 1--1 in FIG. 2;
FIG. 2 is a cross-sectional view taken along the line II--II in FIG. 1;
FIG. 3 is a cross sectional view taken along the line III--III in FIG. 1 also showing an alternative flywheel mass assembly for one of the flywheel masses.
FIG. 4 is a view taken of an alternative twin mass flywheel having dual hysteresis friction damping.
FIG. 5 is a cross-sectional view taken along the line V--V in FIG. 4.
FIG. 6 is a partial cross-sectioned view similar to FIG. 1 but showing alternative cushion stops for bob weights.
FIG. 7 is a cross-sectioned view taken along line VII--VII in FIG. 6.
FIG. 8 and 9 show alternative bob weights.
FIG. 10 is a cross-sectional view of a second embodiment of a torque tran
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patent: 5349882 (1994-09-01), Kamio
Cooke Richard D. M.
Curtis Anthony J.
Automotive Products plc
Germain Lee A.
Luong Vinh T.
Milliken Paul E.
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