# US 2014/0196971 A1 · Drive for an Industrial Truck with Steering Support

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- Number: US 2014/0196971 A1
- Document ID: US20140196971A1
- Status: Published application
- Kind: A1
- Application number: 14/153,513
- Filed: 2014-01-13
- Published: 2014-07-17
- Earliest claimed: 2013-01-14
- Assignees: ZF Friedrichshafen AG
- Applicants: ZF Friedrichshafen AG
- Inventors: Christian Stammberger; Dirk Bald; Michael Hammer
- Web page: https://patentgrep.com/patent/US20140196971A1

## CPC

- B60K 17/30: the ultimate propulsive elements, e.g. ground wheels, being steerable
- 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 drive for an industrial truck with at least one drive motor for driving a wheel of the industrial truck and at least one steering motor for supporting a steering movement of the wheel around a steering axle also features a drawbar for guiding the steering or driving movement by applying a load on the drawbar. The drive motor also rotates upon a steering movement of the wheel, whereas the drawbar is connected in a torque-proof manner, relative to the steering axle, with a component also rotating upon a steering movement of the wheel.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

A drive system for an industrial truck, comprising:
a drive motor mounted to a vehicle frame of the industrial truck and operably configured to provide driving movement to a drive wheel mounted on a rotatable steering axle of the industrial truck;
a steering motor operably configured to provide a steering movement to the steering axle;
a drawbar that controls the steering movement and driving movement responsive to a load applied by an operator of the industrial truck to the drawbar;
the drive motor rotatable relative to the vehicle frame upon rotation of the steering axle upon application of the steering movement; and
the drawbar configured so as to also rotate with the drive motor upon the steering movement of the drive wheel.

### Claim 12 (depends on 11)

The drive system as in claim 11, wherein the drawbar is connected in a torque-proof manner to a side of the drive motor turned away from drive wheel.

### Claim 13 (depends on 11)

The drive system as in claim 11, further comprising a transmission that transfers rotation of the drive motor to an axle of the drive wheel, the drawbar connected to a housing of the transmission.

### Claim 14 (depends on 1)

The drive system as in claim 1, wherein the drawbar is connected in a torque-proof manner to a component of the steering axle that rotates with the steering movement of the drive wheel.

### Claim 15 (depends on 14)

The drive system as in claim 14, wherein the drive motor comprises an output shaft that is coaxial to the steering axle.

### Claim 16 (depends on 15)

The drive system as in claim 15, wherein the drawbar is also rotatable relative to a horizontal axis that is perpendicular to an axis of the steering axle.

### Claim 17 (depends on 11)

The drive system as in claim 11, wherein the drive motor comprises an output shaft that is parallel to the steering axle.

### Claim 18 (depends on 11)

The drive system as in claim 11, further comprising a transmission rotatably mounted relative to the vehicle frame that transfers rotation of the drive motor to an axle of the drive wheel, the transmission and drive motor rotatably driven relative to the vehicle frame by the steering motor mounted.

### Claim 19 (depends on 18)

The drive system as in claim 18, further comprising a swivel ring connected to the drive motor, and a pinion gear that engages with the swivel ring, the pinion gear driven by the steering motor.

### Claim 20 (depends on 19)

The drive system as in claim 19, wherein the steering motor is one of an electric or hydraulically operated motor.