Machine element or mechanism – Gearing – Directly cooperating gears
Reexamination Certificate
1997-07-31
2001-12-04
Fenstermacher, David (Department: 3682)
Machine element or mechanism
Gearing
Directly cooperating gears
C074S413000, C074S417000, C074S6650GB
Reexamination Certificate
active
06324929
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a toothed gearing group for coupling two concentric shafts to a solitary driving shaft.
As known, power is transmitted from a machine to a fluid or from a fluid to a user device with greater efficiency if one uses a pair of counter-rotating propellers. Up to now, energy has been transmitted from a motor to a fluid (air) by using two motors, each designed to drive a respective propeller independently, or by using a single motor but with a drive using planet and crown gear transmission which is similar in principle to the differential of a motor vehicle.
The use of a transmission, however, has the drawback that the solitary input driving shaft is always arranged either at right angles or parallel to the output of the two user shafts; this, in addition to the known drawbacks due to overall dimensions, to weight and the mechanical complexity owing to the use of bevel gears, considerably limits the number of convenient applications.
Moreover, it is impossible to select rotation of the driving shaft concordant with anyone of the twin shafts.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a new toothed gearing group with straight gears for coupling two concentric (twin) and counter-rotating shafts to a solitary driving shaft which is arranged to ensure parallelism between the axes of the driving shaft and the twin shafts.
Another object of the present invention is to provide a new toothed gearing group which makes it possible to apply power to anyone of the three shafts (either twin shafts or driving shaft) and to draw power from the other two or to apply power to two of the shafts and draw it from the third one, i.e., it makes it possible to obtain fully reversible operation.
Another object of the present invention is to provide a toothed gearing group which is very simple in structure, so as to combine mechanical simplicity with high reliability.
This and other objects which will become apparent hereinafter are achieved by a toothed gearing group according to the present invention, which is characterized in that it comprises two concentric twin shafts, an inner one and an outer one respectively, a main gear for each twin shaft, which is rigid in rotation therewith; a solitary shaft which has a first coupling gear in meshing engagement with the main gear of the inner or outer shaft and a second coupling gear, and at least one intermediate shaft rigid in rotation with two coupling gears meshing respectively with the second coupling gear of the said solitary shaft and with the main gear of the said inner or outer shaft, respectively.
Advantageously, the said twin shafts are parallel to the solitary shaft and to the intermediate shaft and the gears are all straight gears.
REFERENCES:
patent: 3244024 (1966-04-01), Flowers
patent: 5494466 (1996-02-01), Vernea
patent: 5724867 (1998-03-01), Jordan
patent: 0 665 916 (1949-09-01), None
patent: 1 436 491 (1976-05-01), None
patent: 2 165 024 (1986-04-01), None
Fenstermacher David
Josif Albert
Modiano Guido
O'Byrne Daniel
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