Rotary shafts – gudgeons – housings – and flexible couplings for ro – Speed responsive device for adjusting relative rotational... – Pivoted weight
Patent
1994-12-29
1997-12-16
Stodola, Daniel P.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Speed responsive device for adjusting relative rotational...
Pivoted weight
192201, 464 68, F16F 1512
Patent
active
056978456
DESCRIPTION:
BRIEF SUMMARY
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.
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 for 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 problem arises due to the pivotal linkage striking one of the flywheel masses at extremes of relative rotation, thereby causing noise. A proposal for the use of cushioning means at the limits of relative rotational movement is disclosed in WO 92/14076. The cushioning means disclosed therein have problems due to the conflicting requirements of resilience on one hand and wear resistance on the other hand.
It is an object of the present invention to provide a twin mass flywheel of the above type with improved cushioning means.
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 being arranged to tend to move radially outwardly as the flywheel rotates, at least one of the flywheel masses having cushioning means thereon to engage the other flywheel mass at the limits of said relative rotation in at least one direction of relative rotational movement characterised in that the cushioning means on said one flywheel mass engages a radially outer marginal portion of the other flywheel mass.
Preferably one flywheel mass comprises a hub, a first annular plate fast with the hub and a pair of annular side plates spaced axially apart and fast with the hub, and the second flywheel mass is mounted on the hub and comprises a second annular plate with a pair of flange plates fixed thereon having portions located between the side plates, and the cushioning means act between the side plates and the flange plates at said limits.
Preferably the flange plates of the second flywheel each have a pair of diametrically opposed radially outwardly projecting arms thereon, the arms on one flange plate being aligned with arms on the other flange plate, and the cushioning means being mounted in aligned apertures in the two side plates.
Preferably the first annular plate has a cylindrical outer side wall forming an annular cavity around the hub and said side plates and flange plates are located within the cavity, and the radially outer ends of the arms engage friction damping devices fixed relative to the radially inner surface of the cylindrical wall.
Conveniently the annular cavity is closed by an annular cover plate fixed to the end of the sidewall away from the first annular plate and the cavity is filled with a viscous material for damping movements within the cavity.
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;
FIGS. 1A and 1B show two halves of a cross-sectional view of a twin mass flywheel according to the present invention taken along the line 1--1 in FIG. 2;
FIG. 2 is a sectional view on line II--II of FIGS. 1A and 1B;
FIG. 2a is a sectional view of one of the end caps for the springs.
FIG. 3 is a plan view of the flange plate showing at FIG. 3A and FIG. 3B sectional views taken on the lines A--A and B--B respectively;
FIG. 4 is a plan view of a side plate showing at FIG
REFERENCES:
patent: 2667049 (1954-01-01), Guernsey et al.
patent: 3455286 (1969-07-01), Reisacher et al.
patent: 3884087 (1975-05-01), Sakaki
patent: 4800996 (1989-01-01), Loizeau
patent: 5083981 (1992-01-01), Forster
Automotive Products plc
Dunn Eileen A.
Germain Lee A.
Milliken Paul E.
Stodola Daniel P.
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