Planetary gear transmission systems or components – Nonplanetary variable speed or direction transmission... – Plural planetary units
Patent
1997-06-27
1999-03-09
Ta, Khol Q.
Planetary gear transmission systems or components
Nonplanetary variable speed or direction transmission...
Plural planetary units
475330, 475347, F16H 146
Patent
active
058792619
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a two-stage planetary gear unit in which there is a one piece second stage planet carrier.
2. The Prior Art
Such planetary gear units are known, for example, from DE 43 18 334 A1 and DE 42 39 331 A1.
SUMMARY OF THE INVENTION
Starting from the known embodiments mentioned above, the invention concerns itself with the problem of simplifying gear units of this kind as regards their manufacture, improving their bearing stiffness and ensuring low noise behavior with these.
The essential advantage of these embodiments lies in the configuration of the second planet carrier as a single one-piece component. This ensures extremely tilt-resistant support for the second planet carrier since, in the case of a gear unit with a speed-reducing action, the forces emanating from the output side are transmitted uniformly to both rolling-contact bearings which support the second planet carrier in the gear case.
The first internal gear is secured releasably on the second planet carrier. This has the advantage, among others, that the internal toothing of this first internal gear is simple to manufacture, for example by broaching and that it is also possible, in particular, to use a separate material.
The rolling-contact bearing of the second planet carrier, the said bearing being laid against the clamping device, simultaneously rests, radially to the inside, on the second planet carrier and the first internal gear secured on the latter. Centering of the first internal gear relative to the second planet carrier is thereby achieved in the simplest way conceivable.
As regards the supporting of the first planet carrier in the second planet carrier, an advantageous embodiment consists in bracing the rolling-contact bearing required for this support against the second planet carrier by means of the first internal gear.
In another embodiment of the Invention, the bracing of the rolling-contact bearing of the second planet carrier between the latter and the gear case is achieved in an extremely expedient manner by the fact that a clamping ring mounted adjustably on the first internal gear ensures bracing of the bearing. This method of bracing bearings is particularly expedient for bearings subject to relatively high loading.
If the bearings are subject to especially high loading then according to this, the clamping device comprises the first internal gear, which rests against the adjacent rolling-contact bearing, and a clamping spring, which can be a Belleville spring, inserted between one of the rolling-contact bearings and a counterbearing. For the abovementioned rolling-contact bearing according to claim 13, the internal gear of the first stage can serve as a folding means in the form of a stop which is mounted on.
BRIEF DESCRIPTION OF THE DRAWINGS
Exemplary embodiments of the invention are illustrated in the drawing, in which
FIG. 1 shows a longitudinal section through a two-stage gear unit with the rolling-contact bearings braced firmly between the second planet carrier and the gear case,
FIG. 2 shows a view of the end face A of the gear unit in the direction of arrow II,
FIG. 3 shows a section through the gear unit along the line III--III,
FIG. 4 shows an alternative embodiment of the gear unit in the view shown in FIG. 1 with sprung bracing of the rolling-contact bearings between the second planet carrier and the gear case,
FIG. 5 shows an elevation of the end A of the gear unit in the direction of arrow V,
FIG. 6 shows a section through the gear unit along the line VI--VI.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
In the embodiment shown in FIG. 1, the second planet carrier 3 of a two-stage planetary gear unit is mounted in a gear case 1 by means of rolling-contact bearings 2. The term "second planet carrier 3" here denotes the planet carrier of the second stage. The planet carrier of the first stage, denoted by the term "first planet carrier 4", is supported in the second planet carrier 3 by means of rolling-contact bearings 5. The rolli
REFERENCES:
patent: 3150544 (1964-09-01), Brass
patent: 3453907 (1969-07-01), Noguchi et al.
patent: 4430909 (1984-02-01), Magnusson
patent: 4611505 (1986-09-01), Cronin et al.
patent: 5295925 (1994-03-01), Hirabayashi
Alpha Getriebebau GmbH
Ta Khol Q.
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