Noise damped dynamo electric machine, especially vehicular type alternator
AssigneeRobert Bosch GmbH
InventorsGunther Bergan, Manfred Frister, Gerhard Henneberger, Peter Lack, Stefan Renner
Life of this patent
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Abstract
In an apparatus for noise reduction and damping in ventilators of electric machines, in particular vehicular alternators, it is proposed that the ventilator support on the rotor shaft be effected by axially staggering inner rubber inlays on both sides and providing adjoining outer spring pressure elements such that the ventilator region is clamped, at least in the axial direction and preferably radially as well with an additional rubber ring. As a result, the transfer of resonant vibrations of the rotor to the ventilator are reliably avoided, and the noise emissions are decisively reduced.
Claims20
Noise damped dynamo electric machine, especially vehicular type alternator, having
- a rotor shaft (11);
- a ventilator wheel (12, 12a) having a disk-shaped portion defining two oppositely located side surfaces, seated on the rotor shaft;
- and
- means for securing the ventilator wheel to the rotor shaft while attenuating noise generation comprising
- an axial clamping system, axially clamping the ventilator wheel to the rotor shaft having
- in axially aligned position,
- a material which is elastically pressure transferring while damping vibration transferred thereto located immediately adjacent a portion of at least one of the side surfaces of the ventilator wheel;
- a spring pressure element seated on the shaft;
- and
- a counter element located on said shaft and facing the other side surface of the ventilator wheel, said elements being secured to the shaft in axially defined positions to clamp the ventilator wheel between said elements with the elastically pressure transferring material between at least one of said elements and the ventilator wheel.
Dependencies are inferred from the claim text.