Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1996-06-21
1998-08-11
Herrmann, Allan D.
Machine element or mechanism
Gearing
Directly cooperating gears
74606R, 403 3, 403344, F16H 5702, F16D 104
Patent
active
057911916
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a gear flanged onto an electric.
2. The Prior Art
In hitherto known gears of this type, in the case of direct flanging the electric motor is in each case centered radially on the gear flange, for which purpose a centering collar mounted in one of the two parts engages with an exact fit into a corresponding inner centering of the other part.
In centering of this type, if manufacturing tolerances of the centering surfaces meet in an unfavorable manner a distorted mounting of the electric motor output shaft relative to the hollow shaft receiving this may occur. Moreover, the production of the respective centering surfaces involves a high outlay in terms of manufacture.
Furthermore, it is known from EP 0,381,829 A1 to flange the electric motor onto the gear via an elastic multipart connecting element and to provide radially centering-free bearing surfaces within the individual parts of this element. This mode of connection is complicated in terms of construction and leads to an increase, undesirable per se, in the overall length of the structural unit consisting of the motor and flanged-on gear.
SUMMARY OF THE INVENTION
The problem with which the invention is primarily concerned is to provide an improvement and a simplification in construction and manufacture here.
The design according to the present invention constitutes a solution to this.
This solution is based on the idea of bringing about the radial centering solely by means of the connection between the electric motor output shaft and the gear hollow shaft receiving this. For this purpose, the hollow shaft is mounted in an appropriately exact and stable manner within the gear case via a rolling bearing attached to the reception region. A design of the hollow shaft for the non-positive reception of the motor output shaft is especially advantageous.
Furthermore, such a gear is to be connectable, in a basic design remaining unchanged, to electric motors having different connecting geometries, that is to say different output shaft diameters and flange designs.
The absence of radial centering between the flange and electric motor housing is especially advantageous in the design according to the present invention. For, in this case, altogether four centering surfaces are dispensed with, since, in the case of a centered connection, such a compensating plate would have to be centered, on each of its end faces, relative to the respective bearing surface, that is to say the gear case, on the one hand, and relative to the electric motor housing, on the other hand.
When a compensating plate with only plane end faces as bearing surfaces is used, it can be produced simply and with great accuracy as regards the parallelism of its end faces. It is substantially more complicated and more costly if this plate had to be manufactured not only plane-parallel, but additionally also with radial centering surfaces. For to achieve this, the plate would have to be rechucked to allow different machining tools to be used. Also, in comparison with an only plane-parallel plate, additional outlay in terms of measurement would be necessary for the manufacturing inspection.
By means of the compensating sleeve provided according to claim 7, an identical basic gear case can be flanged onto electric motors having different output shaft diameters simply by the provision of correspondingly adapted compensating sleeves.
With the present invention an extremely efficient supply of gears for electric motors having different connecting geometries is possible.
As a result, the compensating plate has the same thickness in all cases. Such a compensating plate is adapted circumferentially to the respective different geometries of the electric motor output flange. This is possible in a very simple way without any variation in the basic gear design. Recesses matched to the individual mounting situation can also be worked in the motor-side bearing surface of the compensating plate for the purpose of a radially non-centere
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Wittenstein Manfred
Wolfart Manfred
Alpha Getriebebau GmbH
Herrmann Allan D.
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