Drive device for a forklift truck and forklift truck

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.

Description

[0001] The present invention relates to a drive device for a forklift truck and a forklift truck.

[0002] 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.

[0003] In general, it is desirable for drive systems for industrial trucks to ensure safe operation of the industrial truck.

[0004] It is therefore the object of the present invention to provide a drive device that ensures safe operation of the industrial truck.

[0005] 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.

[0006] 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 system and the sensor system, can be attached to the housing.

[0007] As previously described, the drive device includes a braking system 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, with the energy recovered during deceleration being stored in an energy storage device of the industrial truck.Preferably, the braking device provides an additional braking effect for the industrial truck, preferably by being able to brake a rotational movement of a rotor unit of the electric motor or a rotational movement of a rotor unit of the first electric motor and a rotational movement of a rotor unit of the second electric motor using the braking device.

[0008] As previously described, the drive device includes a sensor assembly attached to the housing. Preferably, the sensor assembly comprises one or more sensor elements. The sensor element is preferably configured to detect the position of the piston section along the direction of movement and, based on this detected position, to 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 deduce the position of the piston section along the direction of movement.Preferably, if multiple sensor elements are provided, a first sensor element is configured to detect the position of the piston section along the direction of movement and, based on this detected position, to 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 deduce the position of the piston section along the direction of movement.Preferably, if multiple 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 that 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 conclusions about the property.

[0009] As previously described, the brake device has 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 using the piston section when the piston section has been subjected to a force in the first direction along the direction of movement and has thus been moved in the first direction to an activated position in which the piston section, via further components of the drive device, such as a first pressure disc, a second pressure disc, a first lamellar pack, a second lamellar pack, a rotor section of a first electric motor, a rotor section of a second electric motor, a first reduction gear and a second reduction gear, exerts a braking effect on a first wheel shaft and on a second wheel shaft and thus on a braking effect on a first wheel and on a second wheel of the industrial truck, if the first wheel is attached to the first wheel shaft and the second wheel to the second wheel shaft.Furthermore, a braking process using the piston section is preferably not initiated if the piston section has been subjected to a force in the second direction along the direction of movement and has thus been moved in the second direction into a deactivated position in which the piston section, via the other components of the drive device, such as the first pressure plate, the second pressure plate, the first lamellar pack, the second lamellar pack, the rotor section of the first electric motor, the rotor section of the second electric motor, the first reduction gear and the second reduction gear, does not exert any braking effect on the first wheel shaft and on the second wheel shaft and thus does not exert any braking effect on the first wheel and on the second wheel of the industrial truck, if the first wheel is attached to the first wheel shaft and the second wheel to the second wheel shaft.In the context of the present invention, the phrase "the piston section has been moved in the first direction along the direction of movement" preferably means that the piston section is in the activated position and was moved into this position at an earlier time. Furthermore, in the context of the present invention, the phrase "the piston section has been moved in the second direction along the direction of movement" preferably means that the piston section is in the deactivated position and was moved into this position at an earlier time.

[0010] As previously described, the sensor device is designed to detect the position of the piston section along the direction of movement. This design ensures that the sensor device can send a signal representing the position of the piston section along the direction of movement to the control unit of the drive device or to the control unit of the industrial truck. This allows the control unit of the drive device or the control unit of the industrial truck to determine the position of the piston section along the direction of movement and, from this, to ascertain whether the piston section will initiate a braking action of the braking device.The control unit of the drive device or the control unit of the industrial truck can therefore determine the position of the piston section along the direction of movement, which can also be referred to as determining the position of the piston section's travel path. This position determination ensures, in particular, a monitoring function as required by safety classes d and e according to ISO 13849-1, which can also be referred to as Performance Levels d and e (PLd and PLe) according to ISO 13849-1. This ensures, in particular, that the function of the service brake is implemented using the piston section in accordance with safety classes d and e according to ISO 13849-1. This increases the overall safety during the operation of the industrial truck. In particular, it increases the safety of the industrial truck operator. Furthermore, it ensures that the industrial truck can also operate autonomously, i.e.,It can be operated without a driver.

[0011] In summary, it can be stated that the present invention increases the safety during the operation of the industrial truck.

[0012] In one embodiment, the braking device defines a fluid-filled cavity, and the braking device is configured such that when the fluid is subjected to a first pressure, the piston section is subjected to a force in a first direction along the direction of movement. By defining the fluid-filled cavity, and by configuring the braking device such that when the fluid is subjected to a first pressure, the piston section is subjected to a force in a first direction along the direction of movement, hydraulic actuation of the braking device is ensured. Preferably, the cavity is defined by a cylinder section.

[0013] In one embodiment, the braking device includes a return element, the braking device being designed such that the return element exerts a force on the piston section in a second direction opposite to the first direction along the direction of movement. By including the return element and designing the braking device such that the return element exerts a force on the piston section in the second direction along the direction of movement, it is ensured that when the fluid is not subjected to the first pressure, the piston section can be moved into the deactivated position by means of the return element. Preferably, in the illustrated embodiment of the drive device, the return element is a compression spring, which ensures a particularly simple design of the drive device.

[0014] In one embodiment, the braking device comprises a first pressure plate, the braking device being designed such that when the piston section is moved in the first direction along the direction of movement, the first pressure plate is subjected to a force in a third direction perpendicular to the direction of movement. By designing the braking device such that when the piston section is moved in the first direction along the direction of movement, the first pressure plate is subjected to a force in a third direction perpendicular to the direction of movement, a particularly simple design of the drive device is ensured, and, on the other hand, a force redirection in a direction perpendicular to the direction of movement is ensured, so that a section of a first lamellar pack can be subjected to a force in a direction perpendicular to the direction of movement.

[0015] In one embodiment, the braking device has a second pressure disc, wherein the braking device is designed such that when the piston section is moved in the first direction along the direction of movement, the second pressure disc is subjected to a force in a fourth direction perpendicular to the direction of movement and opposite to the third direction.By designing the braking device in such a way that when the piston section is moved in the first direction along the direction of movement, the second pressure disc is subjected to a force in the fourth direction perpendicular to the direction of movement, a particularly simple design of the drive device is ensured, and on the other hand, a force redirection in directions perpendicular to the direction of movement is ensured, so that a section of a second lamellar pack can be subjected to a force in directions perpendicular to the direction of movement.

[0016] In one embodiment, the braking device has a first lamellar pack, wherein a first section of the first lamellar pack is non-rotatably connected to the housing of the drive device and a second section of the first lamellar pack is non-rotatably connected to a rotor section of a first electric motor of the drive device and is rotatably mounted relative to the first section in an open state of the first lamellar pack, wherein the braking device is designed such that when the first pressure disk is subjected to a force in the third direction, the first lamellar pack is brought into an at least partially closed state.In the at least partially closed state of the first lamellar pack, the first section of the first lamellar pack and the second section of the first lamellar pack are in contact at least section by section, so that a rotational movement of the second section of the first lamellar pack is slowed down relative to the first section of the first lamellar pack, thus causing the braking effect already described on the first wheel shaft.

[0017] In one embodiment, the braking device has a second lamellar pack, wherein a first section of the second lamellar pack is non-rotatably connected to the housing of the drive device and a second section of the second lamellar pack is non-rotatably connected to a rotor section of a second electric motor of the drive device and is rotatably mounted relative to the first section in an open state of the second lamellar pack, wherein the braking device is designed such that when the second pressure disk is subjected to a force in the fourth direction, the second lamellar pack is brought into an at least partially closed state.In the at least partially closed state of the second lamellar pack, the first section of the second lamellar pack and the second section of the second lamellar pack are in contact at least section by section, so that a rotational movement of the second section of the second lamellar pack is slowed down relative to the first section of the second lamellar pack, thus causing the braking effect already described on the second wheel shaft.

[0018] In one embodiment, the rotor section of the first electric motor can drive a first wheel shaft of the drive device via a first reduction gear of the drive device. The first reduction gear preferably comprises a spur gear stage with two meshing spur gears, and preferably a planetary gear stage comprising a ring gear, planet gears meshing with the ring gear, and a sun gear meshing with the planet gears. A first wheel of the industrial truck can be mounted on the first wheel shaft, so that the first wheel can be driven into a rotary motion by the first electric motor via the first reduction gear, causing the first wheel to roll along a surface in accordance with this rotary motion, thus enabling the industrial truck to be moved across the surface.The first reduction gear adjusts the speed and torque between the first electric motor, which can also be called the first electric machine, and the first wheel. The first wheel can also be called the first drive wheel.

[0019] In one embodiment, the rotor section of the second electric motor can drive a second wheel shaft of the drive device via a second reduction gear. The second reduction gear preferably comprises a spur gear stage with two meshing spur gears, and preferably a planetary gear stage comprising a ring gear, planet gears meshing with the ring gear, and a sun gear meshing with the planet gears. A second wheel of the industrial truck can be attached to the second wheel shaft, so that the second wheel can be driven into a rotary motion by the second electric motor via the second reduction gear, causing the second wheel to roll along the ground in accordance with this rotary motion, thus enabling the industrial truck to be moved across the ground.The second reduction gearbox adjusts the speed and torque between the second electric motor, which can also be called the second electric machine, and the second wheel. The second wheel can also be referred to as the second drive wheel of the industrial truck.

[0020] According to a second aspect of the invention, the aforementioned problem is solved by a forklift truck with the features of claim 10. The forklift truck has a drive device according to the first aspect of the invention. A mounting section of the drive device and a mounting section of the forklift truck are connected to each other. The features, technical effects, and / or advantages described in connection with the drive device according to the first aspect of the invention also apply, at least analogously, to the forklift truck according to the second aspect of the invention, so that a corresponding repetition is omitted here.

[0021] Further features, advantages, and applications of the present invention will become apparent from the following description of the exemplary embodiments and the figures. All features described and / or illustrated, individually and in any combination, constitute the subject matter of the invention, irrespective of their composition in the individual claims or their cross-references. In the figures, the same reference numerals denote identical or similar objects. Fig. Figure 1 shows a schematic representation of an embodiment of a drive device according to the invention.

[0022] Fig.Figure 1 shows a schematic representation of an embodiment of a drive device 1 according to the invention. The drive device 1 is designed for a forklift truck. The drive device 1 has a mounting section that can be connected to a mounting section of the forklift truck. Another aspect of the present invention is a forklift truck with the drive device 1, wherein the mounting section of the drive device 1 and the mounting section of the forklift truck are connected to each other.

[0023] 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. The drive device 1 comprises a first electric motor 9 and a second electric motor 11.

[0024] A 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. The first reduction gear 13 has a spur gear stage with two meshing spur gears and a planetary gear stage with a ring gear, planet gears meshing with the ring gear, and a sun gear meshing with the planet gears. A first wheel of the industrial truck can be attached to the first wheel shaft 15, so that the first wheel can be driven into a rotary motion by the first electric motor 9 via the first reduction gear 13, causing the first wheel to roll along a surface in accordance with this rotary motion, thus moving the industrial truck across the surface.The first reduction gear 13 adjusts the speed and torque between the first electric motor 9, which can also be called the first electric machine, and the first wheel. The first wheel can also be called the first drive wheel.

[0025] Similarly, a 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. The second reduction gear 17 has a spur gear stage with two meshing spur gears and a planetary gear stage with a ring gear, planet gears meshing with the ring gear, and a sun gear meshing with the planet gears. A second wheel of the industrial truck can be attached to the second wheel shaft 19, so that the second wheel can be driven into a rotary motion by the second electric motor 11 via the second reduction gear 17, causing the second wheel to roll along the ground in accordance with this rotary motion and thus allowing the industrial truck to be moved across the ground.The second reduction gear 17 adjusts the speed and torque between the second electric motor 11, which can also be referred to as the second electric machine, and the second wheel. The second wheel can also be referred to as the second drive wheel of the industrial truck.

[0026] Both the first electric motor 9 and the second electric motor 11 can accelerate the movement of the industrial truck across the ground. Furthermore, both the first electric motor 9 and the second electric motor 11 can be operated regeneratively, thus functioning as a service brake by slowing the movement of the industrial truck across the ground and storing the energy recovered during braking in an energy storage device within the industrial truck. A braking device 5 is provided to supply additional braking power to the industrial truck.

[0027] The brake assembly 5 has a piston section 21, a cylinder section 23, a return element 25, a first pressure disc 27, a second pressure disc 29, a first lamellar pack 31 and a second lamellar pack 33.

[0028] The piston section 21 is movable relative to the housing 3 along a direction of movement. The piston section 21 can be moved in a first direction 35 along the direction of movement. Furthermore, the piston section 21 can be moved in a second direction 37 opposite to the first direction 35 along the direction of movement. The sensor device 7 is configured to detect the position of the piston section 21 along the direction of movement.Because the sensor device 7 is designed to detect the position of the piston section 21 along the direction of movement, it is ensured that the sensor device 7 can send a signal representing the position of the piston section 21 along the direction of movement to a control unit of the drive device 1 or to a control unit of the industrial truck, so that the control unit of the drive device 1 or the control unit of the industrial truck can infer the position of the piston section 21 along the direction of movement and can deduce from this whether a braking process of the braking device 5 is triggered by means of the piston section 21.The control unit of the drive device 1 or the control unit of the industrial truck can therefore determine the position of the piston section 21 along the direction of movement, which can also be referred to as determining the position of the travel path of the piston section 21. This position determination ensures, in particular, a monitoring function as required for safety classes d and e according to ISO 13849-1, which can also be referred to as Performance Levels d and e (PLd and PLe) according to ISO 13849-1. This ensures, in particular, that the function of the service brake is implemented using the piston section 21 in accordance with safety classes d and e according to ISO 13849-1. This increases the overall safety during the operation of the industrial truck. In particular, it increases the safety of the industrial truck operator.Furthermore, it is ensured that the industrial truck can also be operated autonomously, i.e. without a driver.

[0029] In the illustrated drive device 1, a braking process is initiated by means of the piston section 21 when the piston section 21 has been subjected to a force in the first direction 35 along the direction of movement and has thus been moved in the first direction 35 into an activated position in which the piston section 21, via further components of the drive device 1, such as the first pressure plate 27, the second pressure plate 29, the first lamellar pack 31, the second lamellar pack 33, the rotor section of the first electric motor 9, the rotor section of the second electric motor 11, the first reduction gear 13 and the second reduction gear 17, exerts a braking effect on the first wheel shaft 15 and on the second wheel shaft 19 and thus on the first wheel and on the second wheel of the industrial truck,when the first wheel is attached to the first wheel shaft 15 and the second wheel to the second wheel shaft 19. Furthermore, in the illustrated drive device 1, a braking process is not initiated by means of the piston section 21 if the piston section 21 has been subjected to a force in the second direction 37 along the direction of movement and has thus been moved in the second direction 37 into a deactivated position, in which the piston section 21 passes over the other components of the drive device 1, such as the first pressure plate 27, the second pressure plate 29, the first lamellar pack 31, the second lamellar pack 33, the rotor section of the first electric motor 9, the rotor section of the second electric motor 11, the first reduction gear 13 and the second reduction gear 17.No braking effect is exerted on the first wheel axle 15 and on the second wheel axle 19, and thus no braking effect is exerted on the first wheel and on the second wheel of the industrial truck, when the first wheel is mounted on the first wheel axle 15 and the second wheel on the second wheel axle 19. In the context of the present invention, the phrase "that the piston section 21 has been moved in the first direction 35 along the direction of movement" preferably means that the piston section 21 is in the activated position and was moved into this position at an earlier time. Furthermore, in the context of the present invention, the phrase "that the piston section 21 has been moved in the second direction 37 along the direction of movement" preferably means that the piston section 21 is in the deactivated position and was moved into this position at an earlier time.

[0030] The brake device 5 defines a fluid-filled cavity 39, wherein the brake device 5 is configured such that when the fluid is subjected to a first pressure, the piston section 21 is subjected to a force in the first direction 35 along the direction of movement. By defining the fluid-filled cavity 39, and by configuring the brake device 5 such that when the fluid is subjected to a first pressure, the piston section 21 is subjected to a force in the first direction 35 along the direction of movement, hydraulic actuation of the brake device 5 is ensured. The cavity 39 is defined by the cylinder section 23.As previously described, the braking device 5 includes the return element 25, and the braking device 5 is designed such that the return element 25 exerts a force on the piston section 21 in the second direction 37 along the direction of movement. Because the braking device 5 includes the return element 25 and is designed such that the return element 25 exerts a force on the piston section 21 in the second direction 37 along the direction of movement, it is ensured that when the fluid is not subjected to the first pressure, the piston section 21 can be moved into the deactivated position by means of the return element 25. In the illustrated embodiment of the drive device 1, the return element 25 is a compression spring, which ensures a particularly simple design of the drive device 1.

[0031] Furthermore, it has already been mentioned that the braking device 5 comprises the first pressure disc 27 and the second pressure disc 29. 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. The braking device 5 is also 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. By designing the braking device 5 such that when the piston section 21 is moved in the first direction 35 along the direction of movement,The first pressure plate 27 is subjected to a force in a third direction 41 perpendicular to the direction of movement, and 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 plate 29 is subjected to a force in a fourth direction 43 perpendicular to the direction of movement and opposite to the third direction 41. This ensures that, on the one hand, a particularly simple design of the drive device 1 is ensured by exerting a force on two pressure plates using one piston section 21, and on the other hand, force redirection in two directions perpendicular to the direction of movement is ensured, so that sections of the first lamellar pack 31 and the second lamellar pack 33 can each be subjected to a force in directions perpendicular to the direction of movement.

[0032] Furthermore, as already described, the braking device 5 comprises the first lamellar pack 31 and the second lamellar pack 33. A first section of the first lamellar pack 31 is rotationally fixed to the housing 3 of the drive device 1, and a second section of the first lamellar pack 31 is rotationally fixed to a rotor section of the first electric motor 9 of the drive device 1 and is rotatably mounted relative to the first section when the first lamellar pack 31 is open. 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.Likewise, a first section of the second lamellar assembly 33 is non-rotatably connected to the housing 3 of the drive device 1, and a second section of the second lamellar assembly 33 is non-rotatably connected to a rotor section of the second electric motor 11 of the drive device 1 and is rotatably mounted relative to the first section when the second lamellar assembly 33 is open. 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 assembly 33 is brought into a state that is at least partially closed.In the at least partially closed state of the first lamellar assembly 31, the first section of the first lamellar assembly 31 and the second section of the first lamellar assembly 31 are in contact, at least partially, so that a rotational movement of the second section of the first lamellar assembly 31 is slowed down relative to the first section of the first lamellar assembly 31, thus producing the braking effect already described on the first wheel shaft 15. In the at least partially closed state of the second lamellar assembly 33, the first section of the second lamellar assembly 33 and the second section of the second lamellar assembly 33 are in contact, at least partially, so that a rotational movement of the second section of the second lamellar assembly 33 is slowed down relative to the first section of the second lamellar assembly 33, thus producing the braking effect already described on the second wheel shaft 19.

[0033] It should be further noted that "having" does not exclude any other elements or steps, and "a" or "an" does not exclude a plurality. It should also be noted that features described with reference to one of the above embodiments may also be used in combination with other features of other embodiments described above. Reference numerals in the claims are not to be considered as a limitation. Reference sign 1 Drive device 3 cases 5. Braking system 7 Sensor device 9 first electric motor 11 second electric motor 13 first reduction gear 15 first wheel axle 17 second reduction gear 19 second wheel axle 21 Piston section 23 Cylinder section 25 Return element 27 first pressure plate 29 second pressure plate 31 first slat package 33 second slat package 35 first direction 37 second direction 39 Cavity 41 third direction 43 fourth direction

Claims

Drive device (1) for a forklift truck, wherein the drive device (1) has 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) movable relative to the housing (3) along a direction of movement, and wherein the sensor device (7) is configured to detect a position of the piston section (21) along the direction of movement. 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. 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. 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. 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). 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 an at least partially closed state. 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 an at least partially closed state. 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). 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). 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.

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