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US 9,751,738 B2Granted
Steering system for an industrial truck
AssigneeHubtex Maschinenbau GmbH & Co. KG
InventorJuergen Keller
Life of this patent
Estimating the term…
Abstract
A steering system for an industrial truck includes a first wheel set configured to be hydraulically steerable, a second wheel set configured to be hydraulically steerable, a first hydraulic linear motor connected to the first wheel set, and a second hydraulic linear motor connected to the second wheel set. The first hydraulic linear motor is provided as a first synchronizing cylinder. The second hydraulic linear motor is provided as a second synchronizing cylinder. The first synchronizing cylinder and the second synchronizing cylinder are operatively connected to each other.
Claims12
A steering system for an industrial truck comprising:
- a chassis;
- a first wheel set configured to be hydraulically steerable;
- a second wheel set configured to be hydraulically steerable;
- a first hydraulic linear motor connected to the first wheel set, the first hydraulic linear motor being provided as a first synchronizing cylinder;
- a second hydraulic linear motor connected to the second wheel set, the second hydraulic linear motor being provided as a second synchronizing cylinder,
- wherein,
- the first synchronizing cylinder and the second synchronizing cylinder are operatively connected to each other,
- the first synchronizing cylinder comprises a first active piston rod configured to transmit a translational movement of a piston, and an additional piston rod configured to provide a synchronization, the additional piston rod not being connected at a free end so that the additional piston rod does not transmit a translational movement,
- the second synchronizing cylinder comprises a second active piston rod configured to transmit a translational movement of a piston, and an additional piston rod configured to provide a synchronization, the additional piston rod not being connected at a free end so that the additional piston rod does not transmit a translational movement,
- the first synchronizing cylinder and the second synchronizing cylinder are arranged parallel to each other,
- the first active piston rod of the first synchronizing cylinder and the second active piston rod of the second synchronizing cylinder are oriented in a same direction, and
- the first synchronizing cylinder and the second synchronizing cylinder are arranged stationary with respect to the chassis of the industrial truck.
9 more elements
The steering system as recited in 1, further comprising:
- a steering element;
- a steering orbitrol mechanically connected to the steering element;
- a steering control apparatus configured to generate a steering angle desired value;
- a first steering motor provided as the first synchronizing cylinder, the first steering motor being hydraulically connected to the steering element and configured to steer the first wheel set;
- a second steering motor provided as the second synchronizing cylinder, the second steering motor being hydraulically connected to the steering element and configured to steer the second wheel set;
- a first steering angle pickup operatively connected to the steering control apparatus and configured to detect a steering angle of either the first wheel set or the second wheel set;
- a third wheel set configured to be steered by a motor power, the third wheel set comprising a third steering motor, the third steering motor being configured to be connected or to be connectable to the steering element;
- a second steering angle pickup operatively connected to the steering control apparatus and configured to detect the steering angle of the third wheel set;
- a switch-over valve configured to switch between a hydraulic connection of the steering orbitrol to the first steering motor and the second steering motor, and a hydraulic connection of the steering orbitrol to the third steering motor,
- wherein,
- the first steering motor, the second steering motor, and the third steering motor of the third wheel set each being further configured to be driven selectively as a function of a desired steering angle value.
8 more elements
Dependencies are inferred from the claim text.