Machine element or mechanism – Gearing – Plural power paths to and/or from gearing
Patent
1991-07-11
1993-09-28
Braun, Leslie A.
Machine element or mechanism
Gearing
Plural power paths to and/or from gearing
74665K, 74665L, F16H 122, B63H 510
Patent
active
052478564
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a gear transmission between an input shaft and two contra-rotating concentric output shafts consisting of a hollow outer shaft and an inner shaft extending through the hollow outer shaft, the input shaft being in line with and connected to the inner shaft, said gear transmission comprising a first gear rigidly connected to the input shaft and the inner shaft, a second gear rigidly connected to the hollow outer shaft, and at least two intermediate gears meshing with the first and second gears and having their axes perpendicular to the concentric shafts, thereby forming right-angle transmissions.
A gear transmission of this type is disclosed U.S. application Pat. No. 4 792 314. This known gear transmission comprises a first bevel gear rigidly connected to the input shaft and the inner shaft, a second bevel gear rigidly connected to the hollow outer shaft and two diametrically opposite intermediate bevel gears meshing with the first and second bevel gears. Each bevel gear has substantially the same diameter, so that the transmission ratio of each right-angle transmission is substantially 1:1.
The object of the invention is to provide an improved gear transmission between an input shaft and two contra-rotating concentric output shafts, in which the meshing gears can be adjusted easily, and which has a high load transmitting capacity due to an improved mesh of the gears.
This object is achieved by a gear transmission of the abovementioned type which is characterized in that each right-angle transmission comprises a cylindrical pinion and a crown wheel meshing with said pinion, the number of teeth of the crown wheel being at least 1.5 times the number of teeth of the cylindrical pinion, thus rendering a transmission ratio between the crown wheel and the cylindrical pinion of at least 1.5.
The invention is based on the idea that in a gear transmission according to the invention two or more cylindrical pinions can mesh with the crown wheels, while maintaining the perfect mesh between the pinions and the crown wheels required for a high load transmitting capacity. A gear transmission according to the invention comprising two or more cylindrical pinions and two crown wheels is compact and efficient.
DE-U-88 03 194 discloses a gear transmission in which the transmission ratio the crown wheel(s) and the cylindrical pinion is more than 1. However, this gear transmission is of another type, in which the input shaft is not in line with the output shafts.
The invention also relates to a gear transmission between an input shaft and two contra-rotating concentric output shafts consisting of a hollow outer shaft and an inner shaft extending through the hollow outer shaft, said gear transmission comprising a first crown wheel rigidly connected to the inner shaft, a second crown wheel rigidly connected to the outer shaft and at least one intermediate cylindrical pinion meshing with the first and second crown wheels and having its axis perpendicular to the concentric shafts, the input shaft being rigidly connected to the cylindrical pinion, as disclosed in DE-U-88 031 94, which is characterized in that the number of teeth of the first and second crown wheels is different and/or that at least two input shafts are provided, each input shaft being rigidly connected to a cylindrical pinion meshing with the first and second crown wheels.
The invention is explained in greater detail with reference to the drawings, in which:
FIG. 1 shows schematically a first embodiment of a gear transmission according to the invention;
FIG. 2 shows schematically a second embodiment of a gear transmission according to the invention;
FIG. 2a shows schematically a variation of the second embodiment;
FIG. 3 shows schematically a third embodiment of the device; and
FIG. 4 shows a variant of the embodiment according to FIG. 3.
FIG. 1 shows a hollow shaft 1 with a shaft 2 running concentrically through it. These concentric shafts can each be connected to, for example, a propeller or driving screw which are driven in opposite directi
REFERENCES:
patent: 1800094 (1931-04-01), Muhlenbruck
patent: 2067203 (1937-01-01), Schleicher
patent: 2395610 (1946-02-01), Cavallaro
patent: 2987031 (1961-06-01), Odden
patent: 3469708 (1969-09-01), Pennington
patent: 3889771 (1975-06-01), Kronogard
patent: 4792314 (1988-12-01), McCormick
Braun Leslie A.
Crown Gear B.V.
Ta Khoi
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