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US 2014/0338493 A1Published application
Dual mass flywheel
AssigneeDayco Europe S.R.L.
InventorsGianluca Cariccia, Giacomo Giansetto, Andrea Montani, Andrea Guala
Life of this patent
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Abstract
The dual mass flywheel comprises a spring assembly (4; 104; 112; 128; 129), if necessary, with two stages of which one can include a spiral spring. Furthermore, the dual mass flywheel comprises a friction damping system (111) that applies torque independently of the rotational speed of the flywheel.
Claims30
A dual mass flywheel comprising:
- a primary mass,
- a secondary mass angularly movable with respect to said primary mass, and
- a spring assembly to connect said primary mass to said secondary mass, the spring assembly comprising:
- a first stage comprising at least one spiral spring,
- a second stage having a torsional stiffness greater than that of the said first stage, and
- a structure configured to connect said first stage in series with said second stage,
- wherein said at least one spiral spring comprises a first end portion rigidly connected to said primary mass or to said secondary mass and a second end portion connected to a body of said structure, said at least one spiral spring being placed side by side, in the axial direction, to said second stage.
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A flywheel comprising:
- a primary mass suitable for being connected to a crankshaft of an internal combustion engine,
- a secondary mass,
- a decoupling spring unit coupled to said primary mass,
- a spring loader coupled to said decoupling spring unit, and
- a plurality of coil springs arranged circumferentially to be loaded when said spring loader and said secondary mass are angularly displaced with respect each other,
- wherein the overall torsional stiffness of said coil springs is greater than that of said decoupling spring unit.
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Dependencies are inferred from the claim text.