Planetary gearset

Patent metadata

Field	Value
Publication number	US-11073194-B2
Application number	US-202016828476-A
Country	US
Kind code	B2
Filing date	Mar 24, 2020
Priority date	Mar 25, 2019
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A planetary gearset ( 6 ) has a sun gear ( 10 ) connected rotationally fixedly to an input shaft ( 8 ), a carrier ( 15 ) that carries planetary gears ( 11 ) and is connected rotationally fixedly to an output shaft ( 16 ), and a ring gear ( 14 ) fixedly connected to a housing ( 4 ) that encloses the planetary gearset ( 6 ). To reduce the noise emission from the planetary gearset with as little structural complexity as possible without reducing its efficiency due to pressure rings that are guided and slide against the planetary gears and the carrier, the sun gear ( 10 ), the planetary gears ( 11 ) and the ring gear ( 14 ) are provided with helical teeth and the input shaft ( 8 ) is at least indirectly supported on the housing ( 4 ), in both axial directions, by way of a single roller bearing ( 20 ).

First claim

The invention claimed is:

1. A planetary gearset comprising:
a sun gear connected rotationally fixed to an input shaft,
a carrier, supporting planetary gears, which is connected rotationally fixed to an output shaft, and the output shaft being rotatably supported within a housing that encloses the planetary gearset,
a ring gear is rotationally fixed to the housing that encloses the planetary gearset,
the sun gear, the planetary gears and the ring gear each being provided with helical teeth, and
the input shaft being at least indirectly supported by the housing and fixed in both axial directions by a single roller bearing.

2. The planetary gearset according to claim 1 , wherein the planetary gearset is provided as an axle transmission in a wheel axle of a vehicle that can be used for agricultural or building purposes, the input shaft is connected at its end, remote from the planetary gear, to an axle differential and is supported by the roller bearing, fixed in both of the axial directions, on a flange connected to the housing, and the input shaft is mounted in the housing in a radially floating manner such that the input shaft is radially movable relative to the housing.

3. The planetary gearset according to claim 1 , wherein the helical teeth ( 9 ) have a helix angle β≤10°.

4. The planetary gearset according to claim 1 , wherein the helical teeth ( 9 ) are formed with a helix angle β≤5°.

5. The planetary gearset according to claim 1 , wherein the helical teeth ( 9 ) are formed with a helix angle β=4°.

6. The planetary gearset according to claim 1 , wherein the roller bearing is in a form of a deep-groove ball bearing, which is fixed, in the axial directions, both relative to the input shaft and relative to the housing and is radially movable relative to the housing.

7. The planetary gearset according to claim 1 , wherein the roller bearing is in the form of a two-sided acting axial needle bearing or an axial ball bearing.

8. A planetary gearset comprising:
a sun gear connected rotationally fixed to an input shaft,
a carrier, supporting planetary gears, which is connected rotationally fixed to an output shaft,
a ring gear which is rotationally fixed to the housing that encloses the planetary gearset,
the sun gear, the planetary gears and the ring gear each being provided with helical teeth,
the input shaft being at least indirectly supported by the housing in both axial directions by a single roller bearing,
the roller bearing is in a form of a deep-groove ball bearing, which is fixed, in the axial directions, both relative to the input shaft and relative to the housing and is guided, relative to the housing, in a radially floating manner, and
the deep-groove ball bearing is arranged in a bore in a bore section extending inside the housing or a flange, which serves to hold the input shaft in such a manner that, between an outer surrounding surface of an outer ring of the deep-groove ball bearing and a bottom of the bore section, an all-round radial gap is formed.

9. A planetary gearset of an axle transmission in a wheel axle of a vehicle, the planetary gearset comprising:
a sun gear having helical teeth and being connected rotationally fixedly to an input shaft of the planetary gearset;
a carrier on which planetary gears are rotatably mounted, the carrier being connected rotationally fixedly to an output shaft, and the planetary gears having helical teeth that mesh with the helical teeth of the sun gear;
a ring gear having helical teeth and being fixedly connected a housing that encloses the planetary gearset, and the helical teeth of the ring gear mesh with the helical teeth of the planetary gears; and
the input shaft being at least indirectly supported on the housing by a single roller bearing such that the input shaft is fixed in both axial directions relative to the housing and radially movable relative to the housing.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Bauer Christoph
• Grabitzky Stefan
• Klose Manfred
• Fischer Walter
• Bauer Andreas

Classifications

• B60B35/125

  of the planetary type · CPC title

• F16H57/0479

  Gears or bearings on planet carriers · CPC title

• F16H1/30 Primary

  in which an orbital gear has an axis crossing the main axis of the gearing and has helical teeth or is a worm · CPC title

• F16H57/021

  Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings · CPC title

• F16H1/28 Primary

  with gears having orbital motion · CPC title