# US 2018/0320777 A1 · Wheel hub transmission

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- Number: US 2018/0320777 A1
- Document ID: US20180320777A1
- Status: Published application
- Kind: A1
- Application number: 15/529,410
- Filed: 2015-11-18
- Published: 2018-11-08
- Earliest claimed: 2014-11-25
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: SIMON BECKA; FRANK KESCHTGES
- Web page: https://patentgrep.com/patent/US20180320777A1

## CPC

- F16H 57/0416: {Air cooling or ventilation}
- B60B 35/12: Torque-transmitting axles (independent suspension aspects B60G)
- B60K 17/043: {Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel}
- F16H: GEARING
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

A wheel hub transmission includes an outer surface configured as an end face. The end face has a plurality of radially oriented cooling fins at regular spaced-apart relationship. A cover is provided to cover the cooling fins at the end face. The cover has a central opening and forms with pairs of adjacent ones of the cooling fins a plurality of radially oriented cooling ducts.

## Claims

### Claim at position 1

-7. (canceled)

### Claim 8

A wheel hub transmission, comprising:
an outer surface configured as an end face, said end face having a plurality of radially oriented cooling fins at regular spaced-apart relationship; and
a cover configured to cover the cooling fins at the end face, said cover having a central opening and forming with pairs of adjacent ones of the cooling fins a plurality of radially oriented cooling ducts.

### Claim 9 (depends on 8)

The wheel hub transmission of claim 8, further comprising a radial fan for directing air flow into the surrounding cooling ducts, said radial fan being attached to a drive axle sized to extend beyond the end face.

### Claim 10 (depends on 9)

The wheel hub transmission of claim 9, wherein the radial fan is configured independent of a direction of rotation.

### Claim 11 (depends on 8)

The wheel hub transmission of claim 8, wherein the cooling fins have different lengths in a radial direction to define long cooling fins and short cooling fins arranged such that in regular sequence in peripheral direction a long cooling fin is followed by a number of short cooling fins followed again by a long cooling fin.

### Claim 12 (depends on 8)

The wheel hub transmission of claim 8, wherein the cooling fins have different lengths in a radial direction to define long cooling fins and short cooling fins arranged such that in regular sequence in peripheral direction a long cooling fin is followed by a short cooling fin followed again by a long cooling fin.

### Claim 13 (depends on 8)

The wheel hub of claim 8, wherein the cover extends conically into the central opening and decreases in height from a center in a direction towards the cooling fins.

### Claim 14

A vehicle, comprising a wheel hub transmission, said wheel hub transmission including an outer surface configured as an end face, said end face having a plurality of radially oriented cooling fins at regular spaced-apart relationship, and a cover configured to cover the cooling fins at the end face, said cover having a central opening and forming with pairs of adjacent ones of the cooling fins a plurality of radially oriented cooling ducts.

### Claim 15 (depends on 14)

The vehicle of claim 14, wherein the wheel hub transmission further includes a radial fan for directing air flow into the surrounding cooling ducts, said radial fan being attached to a drive axle sized to extend beyond the end face.

### Claim 16 (depends on 15)

The vehicle of claim 15, wherein the radial fan is configured in the wheel hub transmission independent of a direction of rotation.

### Claim 17 (depends on 14)

The vehicle of claim 14, wherein the cooling fins have different lengths in a radial direction to define long cooling fins and short cooling fins arranged such that in regular sequence in peripheral direction a long cooling fin is followed by a number of short cooling fins followed again by a long cooling fin.

### Claim 18 (depends on 17)

The vehicle of claim 17, wherein the cooling fins have different lengths in a radial direction to define long cooling fins and short cooling fins arranged such that in regular sequence in peripheral direction a long cooling fin is followed by a short cooling fin followed again by a long, cooling fin.

### Claim 19 (depends on 14)

The vehicle of claim 14, wherein the cover extends conically into the central opening and decreases in height from a center in a direction towards the cooling fins.