PLANETARY GEAR MECHANISM

• US 20140004992A1
• Filed: 06/25/2013
• Published: 01/02/2014
• Est. Priority Date: 06/28/2012
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Robert Bosch GmbH
• Inventors: Weist, Dietmar
• Granted Patent: US 8,900,092 B2
• Time in Patent Office: Days
• US Class Current: 475/331
• CPC Class Codes: F03D 15/00 Transmission of mechanical power
• CPC Class Codes: F03D 15/10 using gearing not limited to rotary motion, e.g. with oscillating or reciprocating members
• CPC Class Codes: F03D 80/70 Bearing or lubricating arrangements
• CPC Class Codes: F05B 2260/40311 of the epicyclic, planetary or differential type
• CPC Class Codes: F16C 19/364 with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
• CPC Class Codes: F16C 19/543 in O-arrangement
• CPC Class Codes: F16C 2360/31 Wind motors in general F03D
• CPC Class Codes: F16C 2361/61 Toothed gear systems, e.g. support of pinion shafts in general F16H57/02
• CPC Class Codes: F16C 35/067 Fixing them in a housing with interposition of an element F16C35/07
• CPC Class Codes: F16H 1/2809 with means for equalising the distribution of load on the planet-wheels
• CPC Class Codes: F16H 2057/085 Bearings for orbital gears
• CPC Class Codes: F16H 57/08 of gearings with members having orbital motion
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction

Abstract

A planetary gear mechanism converts rotational movement of a drive shaft into rotational movement of an output shaft. The mechanism includes a planetary gear carrier, a planetary gear, and a bearing arrangement. The bearing arrangement includes roller bearings spaced apart between the planetary gear and planetary gear carrier. Each roller bearing has an inner ring and outer ring. The bearing arrangement includes a ring to position the roller bearings on the planetary gear carrier and a collar to secure the planetary gear. The ring is on an outer face of the planetary gear carrier between the inner rings. The collar is on an inner face of the planetary gear between the outer rings. An intermediate ring on the inner face of the planetary gear positions the roller bearings. The intermediate ring has a cutout directed to the collar which corresponds to an axial length of the collar.

Claims

1. A planetary gear mechanism for converting a slow rotational movement of a drive shaft into a rapid rotational movement of an output shaft, the planetary gear mechanism comprising:

a planetary gear carrier;

a planetary gear; and

a bearing arrangement arranged on the planetary gear carrier and configured to rotatably mount the planetary gear, the bearing arrangement including;

at least two tapered roller bearings arranged spaced apart axially from one another between the planetary gear and the planetary gear carrier, each of the at least two tapered roller bearings having an inner ring and an outer ring;

a first intermediate ring configured to axially position the at least two tapered roller bearings on the planetary gear carrier, the first intermediate ring arranged on an outer circumferential face of the planetary gear carrier between the two inner rings;

a collar formed on an inner circumferential face of the planetary gear between the two outer rings radially along an inner circumference of the planetary gear, the collar configured to axially secure the planetary gear; and

at least one second intermediate ring configured to axially position the at least two tapered roller bearings with respect to one another, the at least one second intermediate ring arranged on the inner circumferential face of the planetary gear, the at least one second intermediate ring having;

an outer circumferential face; and

a cutout formed on the outer circumferential face and directed to the collar, the cutout configured to correspond at least to an axial length of the collar.

2. The planetary gear mechanism according to claim 1, wherein the collar is configured to come into contact with an axially inwardly directed end face of one of the outer rings.

3. The planetary gear mechanism according to claim 1, wherein:

the collar has two axial end faces,

the collar is formed substantially centrally between the two outer rings,

the at least one second intermediate ring includes two second intermediate rings, and

one of the two second intermediate rings is arranged on each of the two axial end faces of the collar.

4. The planetary gear mechanism according to claim 3, wherein the two second intermediate rings are configured to come into contact on axial end faces.

5. The planetary gear mechanism according to claim 1, wherein the at least two tapered roller bearings have an O-arrangement of antifriction bearing elements.

6. The planetary gear mechanism according to claim 1, wherein the at least one second intermediate ring and the planetary gear have wear-reducing surfaces.

7. The planetary gear mechanism according to claim 1, further comprising a clearance fit provided between the at least one second intermediate ring and the planetary gear.

8. The planetary gear mechanism according to claim 1, wherein:

the collar has axial end faces,

the at least one second intermediate ring has axial end faces, and

the axial end faces of the collar and the axial end faces of the at least one second intermediate ring are hard-turned and/or surface-ground.

9. The planetary gear mechanism according to claim 1, wherein at least two planetary gears of the planetary gear mechanism have a spur toothing system or a helical toothing system.

10. A wind power plant, comprising:

a rotor;

an electric generator; and

a planetary gear mechanism configured to convert a slow rotational movement of the rotor into a rapid rotational movement to operate the electric generator, the planetary gear mechanism including;

a drive shaft connected to the rotor;

an output shaft connected to the electric generator;

a planetary gear carrier;

a planetary gear; and

a bearing arrangement arranged on the planetary gear carrier and configured to rotatably mount the planetary gear, the bearing arrangement including;

at least two tapered roller bearings arranged spaced apart axially from one another between the planetary gear and the planetary gear carrier, each of the at least two tapered roller bearings having an inner ring and an outer ring;

a first intermediate ring configured to axially position the at least two tapered roller bearings on the planetary gear carrier, the first intermediate ring arranged on an outer circumferential face of the planetary gear carrier between the two inner rings;

a collar formed on an inner circumferential face of the planetary gear between the two outer rings radially along an inner circumference of the planetary gear, the collar configured to axially secure the planetary gear; and

at least one second intermediate ring configured to axially position the at least two tapered roller bearings with respect to one another, the at least one second intermediate ring arranged on the inner circumferential face of the planetary gear, the at least one second intermediate ring having;

an outer circumferential face; and

a cutout formed on the outer circumferential face and directed to the collar, the cutout configured to correspond at least to an axial length of the collar.