Planetary gear transmission systems or components – Planetary gearing or element – Coaxial teeth around planet pinion engage axially spaced...
Patent
1995-05-17
1997-05-27
Mamor, Charles A.
Planetary gear transmission systems or components
Planetary gearing or element
Coaxial teeth around planet pinion engage axially spaced...
475342, F16H 5708
Patent
active
056327056
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an epicyclic roller gear with two rings having an internal profile or internal tooth system, wherein a first ring is fixed and a second ring is parallel or coaxial to the first ring and is rotatably mounted with respect thereto and the number of teeth on the internal profile of the two rings is different, further with at least one rotatable rolling element which is capable of rolling on the profiled inner side of the rings and has alternate external gaps and projections which mesh with the internal profiles or internal tooth systems of both rings, wherein the rolling element is rotatably mounted on an arm or the like which is rotatable about an axis or a shaft arranged in the centre of the rings and thereby drives the rolling element in the circumferential direction along the inner sides of the rings, so that on account of the different numbers of teeth on the inner side of the two rings the rotatable ring is movable relative to the fixed ring.
BACKGROUND OF THE INVENTION
Such epicyclic roller gears with a rolling element are known. Above all high transmission ratios can thereby be provided. A drawback in this connection is however that the projections of the rolling element do not have any restraint with respect to the internal profile of the rings, but additional measures have to be taken in order that no backlash or freewheeling occurs within the gear, for instance during reversal of load. A zero-backlash power transmission cannot be attained. The endeavour is therefore made to eliminate these drawbacks by so-called biased gearwheels. However the production costs are thereby increased and the power transmission is affected.
It is furthermore known to produce zero backlash by elastic cages or flexible materials of the component parts, through which however the transmissible forces are limited and higher friction occurs, reducing the efficiency.
The object underlying the invention is therefore to provide a gear of the kind mentioned at the outset, permitting high reduction ratios to be achieved, but at the same time attaining a high efficiency and compulsory zero backlash.
SUMMARY OF THE INVENTION
This object is accomplished in an epicyclic roller gear with two rings each having an internal profile or internal tooth system of the kind mentioned at the outset in that each of the two rings has at least two internal profiles or internal tooth systems which are disposed parallel to each other and are arranged so as to be mutually twisted or offset in the circumferential direction by a fraction of the pitch of the profile or teeth, wherein the internal profiles or internal tooth systems of one ring conform, but the internal profiles or internal tooth systems of the two rings differ from one another, that axially adjacent, complementary profiles with gaps and projections are arranged on the rolling element and correspond in number to the internal profiles or internal tooth systems of the rings, said complementary profiles being mutually offset in the circumferential direction according to the offset of the internal profiles or internal tooth systems on the rings, and that the projection of the rolling element engaging the one internal profile or internal tooth system of a ring is applied in the forward direction and the projection simultaneously engaging the adjacent internal profile or internal tooth system of the same ring is applied in the opposite direction and as the rolling element rolls this engagement of the projections thereof alternates continuously.
The use of in each case at least two internal profiles slightly mutually offset in the circumferential direction, together with the rolling element and the projections likewise offset on it, results in an improved contact ratio of the co-operating profiles and projections and in addition there is zero backlash at each ring from the outset. This is the case especially since at least two projections are always simultaneously in engagement and are arranged relative to each other in such a way that it is
REFERENCES:
patent: 1795996 (1931-03-01), Buttner
patent: 2802377 (1957-08-01), Berthiez
patent: 3453907 (1969-07-01), Noguchi et al.
patent: 4799396 (1989-01-01), Ito
Ifrim Annedore
Ifrim Vasile
Estremsky Sherry Lynn
Mamor Charles A.
Neugart GmbH & Co.
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