Switch gear with at least two gear stages

Details Switch gear with at least two gear stages Switch gear with at least two gear stages

1999-10-25

2001-06-12

Marmor, Charles A. (Department: 3681)

Planetary gear transmission systems or components

Condition responsive control

Overload release

C475S340000, C192S139000

Reexamination Certificate

active

06244984

ABSTRACT:

CROSS REFERENCE TO A FOREIGN APPLICATION
This application claims priority benefit under 35 U.S.C. §119 of European Patent Office application number 98120923.2 entitled “Schaltergetriebe mit wenigstens zwei Getriebestufen” filed on Nov. 4, 1998.
1. Field of the Invention
The invention relates to a switch gear with at least one switching stage formed by a sunwheel which is driven by one planet carrier carrying at least one planet wheel and by a ring gear coaxially disposed with respect to the sunwheel and meshing on the inside with at least one planet wheel, held fixed in its housing, and whereby the switching stage exhibits a cam disk for the actuation of switching elements.
2. Background of the Invention
A switch gear similar in some respects to that of the present invention is known to the art from European Patent 0 355 731 B1 entitled “Vorrichtung zur Betätigung von Schaltelementen” and published Dec. 28,1994 in the form of a limit switch. The limit switch is composed of two gear parts, whereby the first gear part is formed by two gear stages serving as reduction stages. The second gear part is formed by all together four switching stages. The gear parts are constructed as planetary gears. At the same time, a cam disk is respectively provided in each switching stage, which serves for actuation of a corresponding switching element. Each cam disk is held on a planet carrier which additionally carries planet wheels which, in each case, mesh with a clutch wheel serving as a sunwheel and with a female spline of a ring gear fixed on the housing. By means of the reductions respectively achieved it is possible, by means of a drive motor, to control corresponding switching elements, in particular for motion control of cranes or for other devices or machines, via the cam disk.
It would be desirable to create a switch gear of the kind described above which, having the same size, enables further improved reduction ratios.
SUMMARY OF THE INVENTION
The cam disk of a switch gear is provided with a female spline which exhibits approximately the identical pitch circle diameter as the female spline of a corresponding ring gear, whereby the female spline of the cam disk exhibits a number of teeth different from the female spline of the ring gear and whereby the cam disk, by means of the female spline, meshes with at least one planet wheel of a switching stage. A multiplication of the reduction in at least one switching stage results, such that in every gear stage with identical dimensions, a substantially greater reduction can be accommodated. At the same time, it is possible, through corresponding identical dimensions, to integrate the switching stage in the identical pitch dimension as exhibited by switching stages in accordance with the prior art. This is particularly suitable for limit switches which, in the reduction stages, are constructed in accordance with the limit switches described in EP 0 355 731 B1. The planetary gears of the different switching stages of the limit switch of EP 0 355 731 B1 can, in each case, be replaced by a differential toothed gearwheel in order to achieve substantially greater reductions.
Another aspect of the invention, the number of teeth of the female spline of the cam disk is greater than the number of teeth of the female spline of the ring gear, thereby resulting in a particularly advantageous increased reduction ratio.
In another aspect of the invention, where the number of teeth of the female spline of the ring gear is
46
and the number of teeth of the sunwheel is
14
, the number of teeth of the female spline of the cam disk is
49
. In this embodiment, a limit switch with identical dimensions to those exhibited by the prior art exhibits a reduction ratio of 69.98 per gear stage.
Yet another aspect of the invention, a worm gear meshing with a male spline of the ring gear is provided for adjustment of the cam disk, whose reduction ratio is adjusted to the difference in the number of teeth of the cam disk to the ring gear. It is thereby possible to provide the same cam disk adjustment as with EP 0 355 731 B1, whereby the refinement in accordance with the invention is adapted to the correspondingly increased reduction of the cam disk.


REFERENCES:
patent: 3036167 (1962-05-01), Bacchi
patent: 4616528 (1986-10-01), Malinski et al.
patent: 4742730 (1988-05-01), Dorn et al.
patent: 4869139 (1989-09-01), Gotman
patent: 5104360 (1992-04-01), Wientke et al.
patent: 5779587 (1998-07-01), Reilly
patent: 5800305 (1998-09-01), Ra
patent: 0 355 731 B1 (1990-02-01), None
patent: 0 684 452 A2 (1995-11-01), None

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