# US 8,739,930 B2 · Gearbox comprising gear pump

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- Number: US 8,739,930 B2
- Document ID: US8739930B2
- Status: Granted
- Kind: B2
- Application number: 12/193,586
- Filed: 2008-08-18
- Published: 2009-03-05
- Granted: 2014-06-03
- Earliest claimed: 2007-08-31
- Assignees: GM Global Technology Operations LLC
- Applicants: Jörg Bönning; Jan Sporleder
- Inventors: Jörg Bönning; Jan Sporleder
- Web page: https://patentgrep.com/patent/US8739930B2

## CPC

- F16H 57/0436: {Pumps}
- F16H 57/0441: {Arrangements of pumps}
- F16H 57/0494: {with variable gear ratio or for reversing rotary motion}
- F16H: GEARING

## Abstract

A gearbox for a motor vehicle is provided that includes, but is not limited to an input shaft, an output shaft and a plurality of wheel sets for coupling input and output shaft with different transmission ratios and a gear pump, which is arranged to for delivering from a reservoir of the gearbox. The gear pump is an outer gear pump and one of two gears of the gear pump meshing with one another belongs to one of the wheel sets.

## Claims

### Claim 1

A gear pump for a gearbox of a motor vehicle, said gear pump comprising:
a first gear arranged on a gearbox shaft to rotate with said gearbox shaft while maintaining axial play along said gearbox shaft;
a second gear meshing with said first gear in a meshing region; and
a gear pump housing enclosing said second gear and a part of said first gear, wherein
said gear pump housing is movable in the axial direction of said gearbox shaft such that said gear pump housing can follow movement of said first gear within the gearbox due to the axial play of said first gear along said gearbox shaft.

### Claim 2 (depends on 1)

A gear pump as set forth in claim 1 wherein said gear pump housing defines a cylindrical recess extending parallel to said gearbox shaft.

### Claim 3 (depends on 2)

A gear pump as set forth in claim 2 further comprising a shaft disposed through said cylindrical recess to support said gear pump housing while allowing the movement of said gear pump housing in the axial direction of said gearbox shaft.

### Claim 4 (depends on 1)

A gear pump as set forth in claim 1 wherein said second gear is supported by said gear pump housing so as to be afloat.

### Claim 5 (depends on 1)

A gear pump as set forth in claim 1 wherein said gear pump housing and said second gear are each formed of a plastic material.

### Claim 6 (depends on 1)

A gear pump as set forth in claim 1 wherein said gear pump housing defines a cavity below said meshing region.

### Claim 7 (depends on 6)

A gear pump as set forth in claim 6 wherein said gear pump housing defines an outlet extending from said cavity.

### Claim 8 (depends on 7)

A gear pump as set forth in claim 7 further comprising an oil line connected to said outlet for draining oil accumulating in said cavity and distributing the oil to other components of the gearbox.

### Claim 9 (depends on 1)

A gear pump as set forth in claim 1 enclosed by a gearbox housing.

### Claim 10 (depends on 9)

A gear pump as set forth in claim 9 wherein said gear pump housing abuts with the gearbox housing.

### Claim 11 (depends on 1)

A gear pump as set forth in claim 1 wherein said gear pump housing defines an inner contour wall tightly enclosing said second gear on about half of a periphery of said second gear.

### Claim 12 (depends on 1)

A gear pump as set forth in claim 1 wherein said part of said first gear enclosed by said gear pump housing is less than half of a periphery of said first gear.

### Claim 13 (depends on 12)

A gear pump as set forth in claim 12 wherein a lowest location of said periphery of said first gear is not enclosed by said gear pump housing.

### Claim 14 (depends on 2)

A gear pump as set forth in claim 2 wherein said cylindrical recess is non-linear with an axis of rotation of said second gear.