Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1998-08-10
2000-09-19
Battista, Mary Ann
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
464 68, F16F 15139
Patent
active
061195480
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to friction plates and friction dampers and in particular though not exclusively to friction plates and friction dampers for a twin mass flywheel.
BACKGROUND OF THE INVENTION
In the Applicant's earlier co-pending patent application PCT/GB96/00675 there is described a friction damper with sheet metal friction plates in which torque is transferred from a friction plate to a cooperating further component by radially extending tags of the friction plate engaging slots in the further component. This can result in relatively high stresses in the region of the tags and slots.
OBJECTS OF THE INVENTION
It is an object of the present invention to provide a twin mass flywheel having an improved form of friction damper. It is a further object of the present invention to provide a friction damper which is cheap and simple to produce and is of a compact design.
BRIEF SUMMARY OF THE INVENTION
This invention relates to a twin mass flywheel having a first mass and a second mass arranged for relative rotation about a common axis, the relative rotation of the masses being controlled, at least in part, by a friction damper, said friction damper comprising at least one friction plate rotatable about said common axis and having a shaped radially outer or radially inner first peripheral surface which co-operates with a similarly shaped peripheral surface of a first further component to transfer torque between said first further component and said at least one friction plate, said first further component being arranged for rotation with one of said flywheel masses, said shaped first peripheral surface of said at least one friction plate comprising a plurality of drive surfaces, at least one of said drive surfaces being substantially tangential or chordal to a circle drawn concentric with said common axis.
The friction plate may additionally have a second periphery with second drive surfaces tangential or chordal to the friction plate or it may additionally have drive formations formed as axially projecting lugs on an axially orientated surface of the friction plate.
Also in accordance with the present invention there is provided a friction plate for use in a friction damper or similar device in which the friction plate is manufactured by sintering techniques or in which a sintered coating is applied to a friction surface of the friction plate. In particular a friction plate manufactured by sintering techniques may have sintered unitary ramps, and/or lip, and/or lugs provided thereon.
Also in accordance with the present invention there is provided a friction plate for use in a friction damper or similar device in which the friction plate has shaped first drive formations which cooperate with correspondingly shaped second drive formations of a further component of the damper to transfer torque between the friction plate and the further component, the first drive formations containing a plurality of drive surfaces formed as axially projecting lugs on an axially orientated surface of the friction plate. The invention also provides a twin mass flywheel including a friction damper with at least 2 friction surfaces which rotate relative to each other and are biased by a load into engagement with each other during at least part of the relative rotation and the bias load is reacted by an inner or outer race of a bearing the said inner or outer race being axially fixed between two additional components of the twin mass flywheel.
BRIEF ESCRIPTION OF THE VIEWS OF THE DRAWINGS
Embodiments of the present invention shall now be described by way of example only, with reference to the accompanying drawings in which;
FIG. 1 is a cross section view of a twin mass flywheel incorporating a friction damper according to the present invention;
FIGS. 2 to 7 are isometric views of various friction components of the friction damper shown in FIG. 1
FIGS. 8 and 9 are isometric views of alternative friction plates
FIGS. 10 and 11 are isometric views of further alternative friction plates.
FIG.
REFERENCES:
patent: 4887485 (1989-12-01), Kobayashi et al.
patent: 5526714 (1996-06-01), Schierling
patent: 5577582 (1996-11-01), Lindsay
patent: 5816925 (1998-10-01), Mizukami
Automotive Products plc
Battista Mary Ann
Germain Lee A
Milliken Paul E
Weber Ray L
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