| US 7,588,113 B2 | ||
| Wheel drive | ||
| Stephan Scharfenberg, Tüttleben (Germany) | ||
| Assigned to ZF Friedrichshafen AG, Friedrichshafen (Germany) | ||
| Appl. No. 10/587,788 PCT Filed Jan. 19, 2005, PCT No. PCT/EP2005/000486 § 371(c)(1), (2), (4) Date Jul. 31, 2006, PCT Pub. No. WO2005/077696, PCT Pub. Date Aug. 25, 2005. |
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| Claims priority of application No. 10 2004 006 722 (DE), filed on Feb. 11, 2004; and application No. 10 2004 023 341 (DE), filed on May 12, 2004. | ||
| Prior Publication US 2007/0123381 A1, May 31, 2007 | ||
| Int. Cl. B60K 17/30 (2006.01) | ||
| U.S. Cl. 180—253 [475/156] | 9 Claims |
| 1. A wheel drive for an industrial vehicle, the wheel drive comprising:
a first electric prime mover (1) having a first drive shaft (2) driving an output (6), via at least one spur gear transmission (4), in a desired rotational direction which is drivingly coupled to a drive wheel (7);
a second electric prime mover (8) driving a second drive shaft (9) being coupled with the output (6) such that by rotation of the second drive shaft (9) of the second electric prime mover (8), the output (6) rotates in a desired direction to provide a desired steering motion for the wheel drive;
a brake (19) for braking the drive wheel (7);
the first electric prime mover (1), the second electric prime mover (8) and the brake (19) all being disposed co-axially with the second drive shaft (9) of the second prime mover (8) and contained within a common housing with the second electric prime mover (8) being located vertically below the first electric prime mover (1); and
the brake (19) being located between the first prime mover (1) and the second prime mover (8);
wherein the second drive shaft (9) drives an inner central wheel (10) of a planetary transmission (11) having planetary gears (12) operative connected with a first hollow gear (13) and a second hollow gear (14), the first hollow gear (13) and the second hollow gear (14) have different numbers of teeth, and the first hollow gear (13) communicates with one part of the industrial vehicle and the second hollow gear (14) communicates with a rotating part (16).
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