Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-11-26
2001-08-21
Mullins, Burton S. (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S051000, C248S608000, C417S424200
Reexamination Certificate
active
06278209
ABSTRACT:
PRIOR ART
The invention is based on a decoupling device for an electric motor. A decoupling device has already been disclosed (DE 42 40 776 C1) in which the decoupling between the electric motor and fan housing does in fact take place by way of elastic decoupling elements, but this decoupling is still relatively rigid so that the operating noise of the electric motor and operation-induced vibrations of the fan, e.g. due to imbalance of the fan wheel, are still transmitted to the fan housing to a high degree and lead to an undesirable noise generation.
ADVANTAGES OF THE INVENTION
The decoupling device according to the intention, has the advantage over the prior art that it improves the noise decoupling of the electric motor in relation to the housing in a simple manner.
Advantageous improvements and updates of the decoupling device disclosed herein are possible by means of the measures taken hereinafter.
The embodiment of the decoupling elements as decoupling bushes permits a particularly effective vibration decoupling.
It is particularly advantageous, at a first decoupling point, to embody a circumferential retaining collar on the motor mount, which retaining collar, at the first contact point, protrudes into the through opening of the decoupling bush and rests against its interior wall. To embody a circumferential housing collar on the housing, which housing collar, at the second contact point, protrudes into the through opening of the decoupling bush and rests against its interior wall. It is also particularly advantageous, at a second decoupling point, to embody a circumferential retaining collar on the motor mount which retaining collar, at the first contact point, protrudes into the through opening of the decoupling bush and rests against its interior wall and to provide a securing element in which a distance sleeve and a circumferential element collar are embodied. The element collar, at the second contact point, protrudes into the through opening of the decoupling bush and rests against its interior wall, wherein the distance sleeve penetrates the through opening and the retaining collar with radial clearance and is secured resting against the housing by means of a screw connection.
If at least two pairs of decoupling points are provided, which are spaced equidistantly apart from one another in the circumference direction of the motor mount so that the first and second decoupling points alternate, this produces the particular advantage that the decoupling bushes are acted on exclusively by pressure and thrust, and therefore an axial fastening for example by means of gluing or vulcanization of the decoupling bushes can be eliminated, which improves long-term vibration resistance.
It is also advantageous to embody a circumferential retaining collar on the motor mount which, at the first contact point, protrudes into the through opening of the decoupling bush and rests against its interior wall and to embody a circumferential housing collar on the housing. The housing collar, at the second contact point, protrudes into the through opening of the decoupling bush and, starting from the motor mount, to provide a first collar section which rests against the interior wall of the through opening. A second tapering collar section, and a third cylindrical collar section, protrudes with radial clearance into a collar opening of the retaining collar. The radial mobility of the decoupling bushes can thereby be limited by means of stops and the radial rigidity of the decoupling bushes can be influenced as a function of the radial deflection.
It is likewise advantageous to embody a circumferential retaining collar on the motor mount which, at the first contact point, protrudes into the through opening of the decoupling bush and rests against its interior wall, and to provide the housing with a housing opening in which the decoupling bush engages with a bush groove at the second contact point. It is also advantageous to embody a balancing section that adjoins the decoupling bush at the second contact point and whose end supports a covering body, which has a cover collar that protrudes into the through opening of the decoupling bush and has a cover shaft, wherein the cover collar rests against the interior wall of the through opening and the cover shaft penetrates the through opening with radial clearance and is fastened to the motor mount. In this manner, the damping property of the decoupling bush can also be influenced and the radial deflection can be limited.
A secure retention of the decoupling bush can be advantageously achieved by virtue of the fact that a circumferential retaining collar is embodied on the motor mount. The collar is U-shaped at the first contact point and, forming a retaining groove, protrudes into the through opening of the decoupling bush, and the decoupling bush engages with a collar in the retaining groove and engages with a bush groove at the second contact point in a housing opening of the housing.
REFERENCES:
patent: 1574985 (1926-03-01), McWain
patent: 2368727 (1945-02-01), Robinson
patent: 4602176 (1986-07-01), Baker
patent: 4946351 (1990-08-01), Richardson
patent: 88 11 934 (1988-12-01), None
patent: 36 38 393 C2 (1988-12-01), None
patent: 42 40 776 C1 (1994-03-01), None
patent: 0 453 616 A (1990-04-01), None
patent: 596837 (1993-10-01), None
patent: 2 049 307 (1971-03-01), None
Brass Otto
Knoepfel Gerd
Rupp Bernhard
Zink Gerhard
Greigg Edwin E.
Greigg Ronald E.
Mullins Burton S.
Robert & Bosch GmbH
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