Chassis cylinder for an industrial truck with a drive wheel pretensioned against the ground
AssigneeJungheinrich Aktiengesellschaft
InventorsMichael Schüler, Richard Schwarz, Melanie Schefner, Marcel Krenzin
Life of this patent
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Abstract
An industrial truck includes a vehicle frame and a drive unit. The drive unit includes a drive wheel movably mounted to the vehicle frame and a spring unit. The spring unit includes a hydraulic cylinder positioned between the vehicle frame and the drive unit and a switchable valve configured to define a blocked state. The spring unit is configured to pretension the drive wheel against a ground surface. When the switchable valve is in the blocked state, a one-sided movement of the hydraulic cylinder is blocked.
Claims16
An industrial truck comprising:
- a vehicle frame;
- and
- a drive unit comprising,
- a drive wheel movably mounted to the vehicle frame, and
- a spring unit comprising,
- a hydraulic cylinder positioned between the vehicle frame and the drive unit, and
- a switchable valve configured to define a blocked state,
- wherein the spring unit is configured to pretension the drive wheel against a ground surface, and wherein when the switchable valve is in the blocked state, a one-sided movement of the hydraulic cylinder is blocked,
- wherein the hydraulic cylinder is configured as a dual-acting hydraulic cylinder defining a first piston chamber and a second piston chamber, and
- wherein when the switchable valve is in the blocked state, a reduction of a volume in a blocked piston chamber is prevented and an enlargement of the volume in the blocked piston chamber is enabled.
An industrial truck comprising:
- a vehicle frame;
- and
- a drive unit comprising,
- a drive wheel movably mounted to the vehicle frame, and
- a spring unit comprising,
- a hydraulic cylinder positioned between the vehicle frame and the drive unit, and
- a switchable valve configured to define a blocked state,
- wherein the spring unit is configured to pretension the drive wheel against a ground surface, and wherein when the switchable valve is in the blocked state, a one-sided movement of the hydraulic cylinder is blocked,
- wherein the hydraulic cylinder is configured as a dual-acting hydraulic cylinder defining a first piston chamber and a second piston chamber, and
- wherein a load-dependent system pressure is applied to at least one of the first and second piston chambers in at least a first operating state of the industrial truck.
An industrial truck comprising:
- a vehicle control;
- a drive wheel;
- and
- a spring unit operatively coupled to the drive wheel and comprising,
- a hydraulic cylinder positioned between a vehicle frame and a drive unit, and
- a switchable valve configured to be actuated by the vehicle control to define a blocked state,
- wherein the hydraulic cylinder is configured as a dual-acting hydraulic cylinder defining a first piston chamber and a second piston chamber,
- wherein a load-dependent system pressure is applied to at least one of the first and second piston chambers in at least a first operating state of the industrial truck, and
- wherein the vehicle control is configured to open the switchable valve when the vehicle control recognizes a safe operating state,
- wherein the safe operating state is recognized by at least one of a below conditions:
- (1) a steering angle of the industrial truck does not exceed a predetermined value for straight-ahead driving;
- and
- (2) a lifting height of a load carrying means of the vehicle does not exceed a predetermined value of a transport height.
Dependencies are inferred from the claim text.