Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1998-12-11
2001-01-09
Kamen, Noah P. (Department: 3747)
Pumps
Motor driven
Electric or magnetic motor
C417S410100, C415S119000
Reexamination Certificate
active
06171079
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a drive unit, in particular for radial blowers.
Drive units of the above mentioned general type are known in the art. One of such radial blowers is disclosed for example in the German patent document DE 43 34 124 A1. The drive unit in this reference has a damping element assembled from a sleeve which is fitted on a bearing pin and a damping bushing composed of elastic material and mounted on the outer wall of the sleeve. The damping bushing engages over the holder at both end sides with radially extending brackets. For non-rotatable fixation of the damping element in the holder, the latter has a cam-shaped projections which engage in associated depressions in the damping bushing. Such a damping element eliminates motor vibrations and reduces the disturbing noises.
SUMMARY OF THE INVENTION
Accordingly, it is an object of present invention to provide a drive unit of the above mentioned general type, which offers some new advantages in the face of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of present invention resides, briefly stated, in a drive unit in which the damping element has a plurality of roller bodies with radially oriented body axes which are arranged so that they are offset relative to one another, preferably with an identical peripheral angle, and connected with one another substantially at constant distances.
When the drive unit is designed in accordance with the present invention, it has the advantage that through the roller bodies of the damping element, the electric motor can tangentially swing in a defined region. In addition, the electric motor which can have an open or closed design can be pressed-in between two housing surfaces axially non-displaceably, and the axial motor and housing tolerances can be compensated. An expensive fixed bearing can be dispensed with. With corresponding deformation properties of the roller bodies of the damping element which can be composed for example of rubber, the pressing forces on the bearing points of the electric motor can be determined without problems, so that in the open design of the electric motor its bearing brackets are not deformed and the axial gap of the electric motor is maintained within the required tolerance region.
The damping element in accordance with the present invention performs a double function. In particular, on the one hand it guarantees a vibration reducing and noise reducing suspension of the motor in the housing. On the other hand, it takes up dimensional tolerances in the axial direction. Thereby a cost favorable clip mounting of the motor is possible, which substantially simplifies the mounting.
In accordance with a preferable embodiment of the invention, two damping elements are provided one each bearing pin of the electric motor, at the side of the collector and at the output side. Therefore the electric motor is suspended softer and a higher noise reduction is obtained.
REFERENCES:
patent: 4445821 (1984-05-01), Watanabe et al.
patent: 4844621 (1989-07-01), Umemura et al.
patent: 5110266 (1992-05-01), Toyoshima et al.
patent: 5786647 (1998-07-01), Vollmer et al.
Gross Gerhard
Nolting Peter
Santarossa Bruno
Gimie Mahmoud M
Kamen Noah P.
Robert & Bosch GmbH
Striker Michael J.
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