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Vibration damper for the crankshaft of a piston engine
| Details |
Inventors: Haas, Wolfgang; Schmitt, Ruben; Gerhardt, Friedrich; Reik, Wolfgang; Lehmann, Steffen; Ruder, Willi;
Assignee: LuK Lamellen und Kupplungsbau GmbH (Buhl/Baden, DE)
Primary Examiner: Kamen; Noah P.
Assistant Examiner: Huynh; Hai
Attorney, Agent or Firm: Darby & Darby
The crankshaft of a piston engine is assembled with a vibration damper into a discrete module prior to mounting of such module in axial and/or radial bearings of the housing of the engine. The damper has an input element which rotates with the crankshaft and a mass which is angularly movable relative to the input element against the resistance of coil springs. The input element can be provided with a sleeve which surrounds a snout at one axial end of the crankshaft. Alternatively, the damper can be installed in or on or can constitute a cheek of the crankshaft. The coil springs can operate in parallel with a friction generating device which also opposes rotation of the input element and the mass of the damper relative to each other. |
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DETAILED DESCRIPTION One feature of the present invention resides in the provision of a piston engine which comprises a housing, a crankshaft which is rotatably journalled in the housing, and means for damping vibrations of the crankshaft.
The damping means is at least partially confined in the housing and is provided on the crankshaft.
In accordance with a presently preferred embodiment, the damping means is fully or practically fully confined in the housing of the piston engine.
A presently preferred embodiment of the damping means comprises a first component including a rotary input element and a second component including at least one rotary inertia-enhancing mass.
The input element and the at least one mass are rotatable relative to each other, and the damping means further comprises energy storing resilient means interposed between the input element and the at least one mass to oppose rotation of the input element and the at least one mass relative to each other.
The energy storing resilient means can comprise one or more coil springs, and the piston engine can further comprise at least one friction generating device which is installed to oppose at least certain stages of rotation of the input element and the at least one mass relative to each other.
It is possible to utilize the friction generating device(s) in lieu of the energy storing resilient element or elements.
The damping means can be mounted on or in or adjacent a cheek or web of the crankshaft.
For example, the damping means can be located adjacent a cheek as seen in the axial direction of the crankshaft.
The damping means can include or constitute a ring which is concentric with a portion of the crankshaft, for example, with an end portion referred to as snout.
A cheek of the crankshaft can be positioned adjacent to but still spaced apart from a wall of the housing (as seen in the axial direction of the crankshaft), and the damping means can be disposed in the housing between such cheek and the wall.
The crankshaft can comprise a portion (such as the aforementioned snout) which is rotatably mounted in the wall
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