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DE-102024210778-A1 - Drive device for a forklift truck and forklift truck

DE102024210778A1DE 102024210778 A1DE102024210778 A1DE 102024210778A1DE-102024210778-A1

Abstract

A drive device (1) for a forklift truck is shown and described, wherein the drive device (1) comprises a housing (3), a brake device (5) attached to the housing (3), and a sensor device (7) attached to the housing (3), wherein the brake device (5) has a piston section (21) that is movable relative to the housing (3) along a direction of movement, and wherein the sensor device (7) is configured to detect the position of the piston section (21) along the direction of movement. A forklift truck with a drive device (1) is also described.

Inventors

  • Michael Anetzberger

Assignees

  • ZF FRIEDRICHSHAFEN AG

Dates

Publication Date
20260513
Application Date
20241108

Claims (10)

  1. Drive device (1) for a forklift truck, wherein the drive device (1) comprises a housing (3), a brake device (5) attached to the housing (3), and a sensor device (7) attached to the housing (3), whereby the brake device (5) has a piston section (21) movable relative to the housing (3) along a direction of movement, and whereby the sensor device (7) is configured to detect a position of the piston section (21) along the direction of movement.
  2. Drive device (1) according to the preceding claim, wherein the braking device (5) defines a cavity (39) filled with a fluid, wherein the braking device (5) is designed such that when the fluid is subjected to a first pressure, the piston section (21) is subjected to a force in a first direction (35) along the direction of movement.
  3. Drive device (1) according to one of the preceding claims, wherein the braking device (5) has a return element (25), wherein the braking device (5) is designed such that the return element (25) applies a force to the piston section (21) in a second direction (37) opposite to the first direction (35) along the direction of movement.
  4. Drive device (1) according to one of the preceding claims, wherein the braking device (5) has a first pressure disc (27), wherein the braking device (5) is designed such that when the piston section (21) is moved in the first direction (35) along the direction of movement, the first pressure disc (27) is subjected to a force in a third direction (41) perpendicular to the direction of movement.
  5. Drive device (1) according to one of the preceding claims, wherein the braking device (5) has a second pressure disc (29), wherein the braking device (5) is designed such that when the piston section (21) is moved in the first direction (35) along the direction of movement, the second pressure disc (29) is subjected to a force in a fourth direction (43) perpendicular to the direction of movement and opposite to the third direction (41).
  6. drive device (1) according to one of the preceding Claims 4 or 5 , wherein the braking device (5) has a first lamellar pack (31), wherein a first section of the first lamellar pack (31) is non-rotatably connected to the housing (3) of the drive device (1) and a second section of the first lamellar pack (31) is non-rotatably connected to a rotor section of a first electric motor (9) of the drive device (1) and is rotatably mounted relative to the first section in an open state of the first lamellar pack (31), wherein the braking device (5) is designed such that when the first pressure disk (27) is subjected to a force in the third direction (41), the first lamellar pack (31) is brought into a state that is at least partially closed.
  7. drive device (1) according to one of the preceding Claims 5 or 6 , wherein the braking device (5) has a second lamellar pack (33), wherein a first section of the second lamellar pack (33) is non-rotatably connected to the housing (3) of the drive device (1) and a second section of the second lamellar pack (33) is non-rotatably connected to a rotor section of a second electric motor (11) of the drive device (1) and is rotatably mounted relative to the first section in an open state of the second lamellar pack (33), wherein the braking device (5) is designed such that when the second pressure disk (29) is subjected to a force in the fourth direction (43), the second lamellar pack (33) is brought into a state that is at least partially closed.
  8. drive device (1) according to one of the preceding Claims 6 or 7 , wherein the rotor section of the first electric motor (9) can drive a first wheel shaft (15) of the drive device (1) via a first reduction gear (13) of the drive device (1).
  9. drive device (1) according to one of the preceding Claims 7 or 8 , wherein the rotor section of the second electric motor (11) can drive a second wheel shaft (19) of the drive device (1) via a second reduction gear (17) of the drive device (1).
  10. Industrial truck with a drive device (1) according to one of the preceding claims, wherein a fastening section of the drive device (1) and a fastening section of the industrial truck are connected to each other.

Description

The present invention relates to a drive device for a forklift truck and a forklift truck. Drive devices for industrial trucks are known from the prior art. These drive devices, known from the prior art, include, for example, an electric motor with a rotor section that can drive a wheel shaft to which a wheel of the industrial truck can be attached, so that when the wheel is attached to the wheel shaft, it can be driven into a rotary motion by means of the electric motor, causing the wheel to roll along a surface and thus allowing the industrial truck to be moved along the surface. In general, it is desirable for drive systems for industrial trucks to ensure safe operation of the industrial truck. It is therefore the object of the present invention to provide a drive device that ensures safe operation of the industrial truck. According to a first aspect of the invention, the aforementioned problem is solved by a drive device with the features of claim 1. The drive device is designed for a forklift truck. The drive device comprises a housing. Furthermore, the drive device comprises a braking device attached to the housing. The drive device also comprises a sensor device attached to the housing. The braking device has a piston section that is movable relative to the housing along a direction of movement. The sensor device is configured to detect the position of the piston section along the direction of movement. As previously described, the drive device is designed for a forklift truck. Preferably, the drive device has a mounting section that can be connected to a mounting section of the forklift truck. As also previously described, the drive device has a housing. Various components of the drive device, such as the braking device and the sensor device, can be attached to the housing. As previously described, the drive device includes a braking device attached to the housing. Preferably, the drive device comprises an electric motor, or a first electric motor and a second electric motor, each capable of accelerating the movement of the industrial truck across a surface. Preferably, the electric motor, or the first and second electric motors, can be operated regeneratively and thus function as a service brake by decelerating the movement of the industrial truck across the surface and storing the energy recovered during deceleration in an energy storage device of the industrial truck. Preferably, the braking device provides an additional braking effect for the industrial truck, preferably by braking the rotation of a rotor unit of the electric motor, or the rotation of a rotor unit of the first electric motor and the rotation of a rotor unit of the second electric motor. As previously described, the drive device includes a sensor assembly attached to the housing. Preferably, the sensor assembly comprises one or more sensor elements. Preferably, the sensor element is configured to detect the position of the piston section along the direction of movement and, based on this detected position, provide a signal representing the position of the piston section along the direction of movement. Preferably, the provided signal is sent to a control unit of the drive device or to a control unit of the industrial truck, so that the control unit of the drive device or the control unit of the industrial truck can infer the position of the piston section along the direction of movement. Preferably, if multiple sensor elements are provided, a first sensor element of the multiple sensor elements is configured to detect the position of the piston section along the direction of movement and, based on this detected position, provide a signal representing the position of the piston section along the direction of movement. Preferably, the provided signal is sent to the control unit of the drive device or to the control unit of the industrial truck, so that the control unit of the drive device or the control unit of the industrial truck can infer the position of the piston section along the direction of movement. Preferably, if several sensor elements are provided, a second sensor element is configured to detect a property, such as pressure or temperature. and to provide a signal representing the detected property. Preferably, the provided signal is sent to the control unit of the drive device or to the control unit of the industrial truck, so that the control unit of the drive device or the control unit of the industrial truck can draw a conclusion about the property. As previously described, the braking device includes a piston section that is movable relative to the housing along the direction of movement. Preferably, the piston section can be moved in a first direction along the direction of movement. Furthermore, the piston section can preferably be moved in a second direction opposite to the first direction along the direction of movement. Preferably, a braking process is initiated by means of the piston section when the piston se