US 6,186,262 B1Granted

Hydrostatic mechanical wheel drive

AssigneeZF Friedrichshafen AG

InventorsEgon Mann, Wolfgang Gebhard

Life of this patent

Estimating the term…

Loading patent…

Abstract

In a wheel drive with a radial-piston motor (5) and a planet gear (4) a wheel hub (3) being placed on a wheel hub support (1) by means of wheel bearings (10). The wheel hub support (1) can be joined to a transmission connector (4) in a single piece and is fastened to a vehicle chassis support. A dog tooth brake (7) is located on the side of the wheel drive facing the vehicle and serves as parking brake. In a cover (2) for a hydraulic connection of the radial-piston motor (5) are integrated valves for control of the radial-piston motor (5) and of the brake (7). Short lines and delay times occur as result. The cover (2) contains inter alia a brake valve (58) for a hydraulic brake function and a displacement change-over valve (64) enabling certain cylinders (70) of the radial-piston motor (5) to be switched on or off.

Claims12

Dependent claims

A hydrostatic mechanical wheel drive comprising:

a wheel hub support containing a hydrostatic radial-piston motor (5), the hydrostatic radial-piston motor (5) connected to a wheel hub (3) by a drive shaft to supply drive thereto, and the wheel hub (3) being supported by a first and second wheel bearings on the wheel hub support;
the drive shaft (5) having a first end supporting a brake, the brake being biased, by a spring (20) coupled to a brake piston (15), into an engaged position to stop rotation of the wheel hub (3), valves for controlling operation of said radial-piston motor(5) and said brake (7), said brake piston (15) being opened by a fluid pressure to overcome the biasing force of the spring, and the motor (5) the brake (7) and the valves all being housed in a cover (2) within said hub support;
and
wherein said drive shaft having a second end supporting a sun gear for driving said wheel hub via an epicyclic gear, the epicyclic gear comprising a stationary planet carrier (35) fixed to the wheel hub support and supporting rotatable planetary gears, and the wheel hub supports a ring gear meshing with the rotatable planetary gears for supplying drive from the sun gear to the wheel hub.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/254,566Filed 8 Mar 1999
Priority: DE 196 37 57014 Sep 1996
Granted: 13 Feb 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B60K 7/0015
Disposition of motor in, or adjacent to, traction wheel: the motor being hydraulic
B60K 17/046
Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel: with planetary gearing having…
F16D 55/02
Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes: with axially-movable discs or pads…
F16D 59/02
Self-acting brakes, e.g. coming into operation at a predetermined speed: spring-loaded and adapted to be released by mechanical, fluid, or…