Machine element or mechanism – Gearing – Directly cooperating gears
Reexamination Certificate
2000-04-27
2001-05-22
Herrmann, Allan D. (Department: 3682)
Machine element or mechanism
Gearing
Directly cooperating gears
C074S416000, C074S417000, C074S60600R
Reexamination Certificate
active
06234037
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates generally to the field of gear systems and more particularly to a modular gear system which includes a contrate gear.
Modular gear systems are typically formed by connecting various gear modules and drive modules to one another to form a gear drive unit which matches the requirements of a given application.
In prior art modular gear systems, the angular gears represent particularly complex components. An additional gear stage with bevel toothing or a worm wheel set is generally provided. In the case of combined bevel and spurgears, an at least two-stage transmission is therefore obtained since there is an input spur wheel set connected to the input of the bevel wheel set and possibly another spur wheel set connected to its output in order, at least to this extent, to standardize its construction with gear modules of a different design. It is likewise always possible for a worm wheel set to be placed ahead of a spur wheel set, for which reason there is often an at least two-stage transmission in this case. Very large transmission ratios can be achieved with such a two-stage transmission of a worm wheel gear.
Contrate gears are also known, which are likewise angular gears and in which a cylindrical pinion interacts with what is referred to as the contrate gear. A gear of this kind is described in the German periodical “antriebstechnik” (Drive Technology), 33 (1994) No. 11, in an article entitled “Cylkro-Getriebe—eine neue Herausforderung” (Cylkro gears—a new challenge). The contrate wheel of such a gear can be described as a rack curved in the form of a circle, the teeth of which are arranged either parallel to the plane of the circle or obliquely to it, the associated cylindrical pinion having a constant geometry along its tooth width and therefore also being immediately suitable for engagement in customary spur wheel toothing. Particularly if a suitable diameter for the contrate wheel is chosen, the contrate wheel gear offers the advantage of a large transmission range, axial freedom of the pinion and any angle of the axes.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a modular gear system which incorporates a simplified angular gear module which can be combined with various gear modules and drive modules.
Another object of the present invention is to provide a gear module which incorporates a contrate gear.
The foregoing and other objects and advantages of the present invention will appear more clearly hereinafter.
In accordance with the present invention there is provided a modular gear system with a contrate gear which includes a plurality of gear modules and drive modules. The gear modules and drive modules each have a cylindrical output pinion which facilitates connecting the various modules to provide a desired transmission ratio. Each of the modules has a housing which includes a mounting flange for removably connecting the housings one to another.
The various gear modules in the modular system include spur gears, parallel-shaft gears, contrate worm gears and combined bevel and spur gears. In the spur gear modules and the parallel-shaft gears the axis of the output shaft is parallel to the output shaft of the respective drive modules combined therewith. In the contrate worm gear modules and the combined bevel and spur gear modules, the output shaft is generally at a right angle to the output shaft of the respective drive module combined therewith.
The drive modules are generally electric motors of various types of construction which can be designated as “flange type” motors.
In addition, there is also the “free-shaft” type of unit where the drive module has an input shaft which can be connected via suitable gear to a separate drive.
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Baxley Charles E.
Herrmann Allan D.
Lenze GmbH & Co KG
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