# US 2014/0194245 A1 · Planetary gear unit

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- Number: US 2014/0194245 A1
- Document ID: US20140194245A1
- Status: Published application
- Kind: A1
- Application number: 14/131,249
- Filed: 2012-05-07
- Published: 2014-07-10
- Earliest claimed: 2011-07-07
- Assignees: Schaeffler Technologies AG & Co. KG
- Inventors: Tom-Michel During; Ramon Jurjanz; Philip Wurzberger
- Web page: https://patentgrep.com/patent/US20140194245A1

## CPC

- F16H 1/46: Systems consisting of a plurality of gear trains each with orbital gears, {i.e. systems having three or more central gears}
- F16C 19/547: {with two angular contact rolling bearings}
- F16H 48/36: characterised by intentionally generating speed difference between outputs
- F16H 57/08: of gearings with members having orbital motion
- F16C 19/163: {with angular contact}
- F16C 19/182: {in tandem arrangement}
- F16C 2361/61: Toothed gear systems, e.g. support of pinion shafts
- F16H 48/10: with orbital spur gears
- F16H 48/11: having intermeshing planet gears
- F16H 2048/368: {using additional orbital gears in combination with clutches or brakes}
- F16H 2048/426: {characterised by spigot bearing arrangement, e.g. bearing for supporting the free end of the drive shaft pinion}
- F16H: GEARING
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A planetary gear unit, having at least one first set of first planetary wheels arranged at a radial distance to a central axis, which mesh with a first sun gear that is rotatable around the central axis. The planetary gear unit further includes at least one second set of second planetary wheels arranged at a radial distance to the central axis, where the second planetary wheels mesh with a second sun gear that is rotatable around the central axis.

## Claims

### Claim at position 1

1-7. (canceled)

### Claim 8

A planetary gear unit, comprising:
a central axis;
a first sun gear;
a second sun gear;
at least one first set of first planet gears, which are arranged at a radial distance from the central axis and which are in mesh with the first sun gear, which can be rotated about the central axis; and,
at least one second set of second planet gears, which are arranged at a radial distance from the central axis, wherein the second planet gears are in mesh with the second sun gear that can be rotated about the central axis, and wherein at least one of the sun gears is mounted in the planetary gear unit by means of at least one angular ball bearing in a manner allowing rotation about the central axis.

### Claim 9 (depends on 8)

The planetary gear unit as recited in claim 8, wherein each of the sun gears is mounted with a respective angular ball bearing in a manner allowing rotation.

### Claim 10 (depends on 8)

The planetary gear unit as recited in claim 8, wherein at least the planet gears of one of the sets of planet gears are borne by a planet carrier at a radial distance from the central axis in a manner allowing rotation about their own axis of rotation, and wherein at least the sun gear, which is in mesh with the planet gears, borne by the planet carrier, is mounted on the planet carrier by means of the angular ball bearing in a manner allowing rotation.

### Claim 11 (depends on 10)

The planetary gear unit as recited in claim 10, wherein the first sun gear is mounted on the planet carrier by means of an angular ball bearing in a manner allowing rotation.

### Claim 12 (depends on 8)

The planetary gear unit as recited in claim 8, wherein at least the planet gears of one of the sets are borne by a planet carrier, which can be rotated about the central axis relative to a connecting shaft, and at least one sun gear of the sun gears is mounted on the connecting shaft by means of an angular ball bearing in a manner allowing rotation.

### Claim 13 (depends on 8)

The planetary gear unit as recited in claim 8, wherein the first planet gears and the second planet gears are both borne jointly by one planet carrier at a radial distance from the central axis in such a way that both the first and second planet gears can be rotated about their own axis of rotation.

### Claim 14 (depends on 8)

A differential assembly having a differential and a planetary gear unit, as recited in claim 8, wherein the differential makes it possible to distribute the torque, applied to a sum shaft of the differential, to a first output shaft and to a second output shaft by means of compensating gears of the differential, the compensating gears being able to rotate relative to each other, and wherein the first planet gears and the second planet gears are borne together by one planet carrier at a radial distance from the central axis in the planetary gear unit in such a way that both first and second planet gears can be rotated about their own axis of rotation, and wherein the first sun gear is mounted on the planet carrier by means of an angular ball bearing in a manner allowing rotation about the central axis, and the second sun gear is supported on the sum shaft by means of a second angular ball bearing in a manner allowing rotation about the central axis.