Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Patent
1997-01-17
1998-12-15
Reese, Randolph A.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
192212, 19221322, F16D 314
Patent
active
058489380
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a twin mass flywheel for transmitting torque and absorbing or compensating for torsional vibrations such as can arise in a vehicle transmission assembly.
SUMMARY OF THE INVENTION
More particularly the invention relates to a link-type twin mass flywheel comprising two co-axially arranged flywheel masses which are mounted for limited angular rotation relative to each other; and a plurality of pivotal linkages 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, in which the action of the links controls relative rotation of the flywheel masses.
It is the object of the present invention to provide an improved form of link-type twin mass flywheel.
Thus according to the present invention there is provided a link-type twin-mass flywheel in which the controlling action of the links is supplemented by one or more assister springs which operate over a significant proportion (e.g. the majority) of the full drive direction range of relative rotation.
In such a link-type twin mass flywheel the circumferentially acting springs come into operation in at least one of the following conditions: in the drive direction and in particular between 0% and 50% of the total relative rotation of the flywheel masses in the drive direction. e.g. typically 25%. masses in the drive direction. e.g. typically 7 degrees.
Typically the total possible assister spring compression is greater than 10 degrees of relative rotation of the flywheel masses e.g. typically 20 degrees of relative rotation of the flywheel masses.
The total assister spring rate may be less than 20 Nm per degree of relative rotation of the flywheel masses e.g. typically 12 Nm per degree of relative rotation of the flywheel masses.
Also for a given engine installation at the maximum deflected relative rotational position of the flywheel masses at a steady engine speed, further significant deflection of the assister springs is still possible. This further deflection is used to accommodate relative rotation occurring during transient engine conditions e.g. during engine start.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention shall now be described, by way of example only, with reference to the accompanying drawings in which;
FIG. 1 is an axial cut away view of a link-type twin mass flywheel according to the present invention taken in the direction B of FIG. 2,
FIG. 2 is a radial composite cross section taken along the line 2--2 of FIG. 1 without showing shoe 82 for clarity.
FIG. 3 is an equivalent view to FIGS. 1 of a second embodiment of a link type twin mass flywheel according to the present invention;
FIG. 4 is an enlarged view of part of FIG. 3;
FIG. 5 is a cross section view taken along the line 5--5 of FIG. 3 and
FIG. 6 is a cross section view taken along the line 6--6 of FIG. 3.
FIG. 7 is an embodiment that shows the end stop resilient means as a pair of concentric springs acting in parallel.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to FIGS. 1 and 2 there is illustrated a link-type twin mass flywheel 10 which is formed from two flywheel masses 11 and 12.
One flywheel mass 11 (also known as an input flywheel mass) is fixed to a crankshaft (not shown) of an internal combustion engine by way of a central hub 14 and bolts (not shown) which pass through holes 18. In use a friction clutch (not shown) is secured to the second flywheel mass 12 (also known as an output flywheel mass) to connect the second flywheel mass with an associated gearbox (not shown).
Under normal drive and over-run conditions the twin mass flywheel 10 rotates in an clockwise direction in the view shown in FIG. 1 as indicated by arrow E.
The flywheel mass 11 comprises the central hub 14, a main housing plate 15, a cover plate 13 and a starter ring 27 which is welded to the main housing plate 15. An inner bearing retaining plate 28 is fixed to the hub 14 by rivets (not s
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Curtis Anthony John
Murphy Rober John
Automotive Products plc
Dunn Eileen A.
Germain Lee A.
Milliken Paul E.
Reese Randolph A.
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