Movable goods shelf

Abstract

The utility model discloses a movable goods shelf which comprises ground rails, a plurality of connected goods shelf sets, a plurality of supporting beams, a driving motor and connecting rods, the supporting beams are arranged on the ground rails through driving wheels and driven wheels, each supporting beam is connected with one ground rail, the driving wheels on the adjacent supporting beams are connected through the connecting rods, the driving motor is connected with any supporting beam, and the connecting rods are connected with the supporting beams. The driving motors are in transmission connection with the driving wheels in the bearing beams to drive the bearing beams to move in the extending direction of the ground rail, the lower portions of the goods shelf sets are connected with two adjacent bearing beams, and the adjacent edges of the adjacent goods shelf sets are located on the same bearing beam; the goods shelf modules are sequentially arranged on the ground rail in a front-and-back mode. The movable goods shelf provided by the utility model can effectively avoid deformation of the whole row of goods shelves due to asynchronism of a plurality of driving motors; the utility model provides a movable goods shelf, belongs to the technical field of storage equipment, and is applied to an intelligent storage system.

Description

TECHNICAL FIELD

[0001] The utility model relates to warehouse equipment technical field, especially movable goods shelves. BACKGROUND

[0002] The movable goods shelves are important components of modern warehouse equipment, can effectively save the warehouse space, and multiple movable goods shelves are arranged on the same track, and the multiple movable goods shelves can be relatively moved, and a channel is left to facilitate the staff to quickly take out the goods on the warehouse shelves.

[0003] However, the user finds that the existing movable goods shelves have the following problems, first, the existing movable goods shelves, each row of shelves includes a plurality of mutually connected shelves, and a drive motor needs to be arranged below each shelf to drive the entire row of shelves to slide along the track, a large number of drive motors need to be arranged, the cost is high, and in the multiple motor driving mode, as long as one of the drive motors fails, the entire row of shelves may be deformed during the continuous movement of the other motors, the heat generation of the failed motor may also be increased, and the asynchronization between the multiple drive motors cannot be avoided when the entire row of shelves is driven to move by the multiple drive motors, and the entire row of shelves may also be deformed after being used for a long time. SUMMARY

[0004] The utility model aims at providing a movable goods shelf to solve one or more technical problems in the prior art and at least provide a beneficial choice or create conditions.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] Firstly, the utility model provides a movable goods shelf, which comprises:

[0007] The ground rails are parallel and uniformly distributed.

[0008] The goods shelf module comprises a plurality of connected shelf groups, a plurality of supporting beams, a drive motor and a connecting rod. The supporting beams are arranged on the ground rails through driving wheels and driven wheels. Each supporting beam is connected to a ground rail. The supporting beams are parallel to the ground rails. The driving wheels on adjacent supporting beams are connected through the connecting rod. The drive motor is connected to any supporting beam. The drive motor is in driving connection with the driving wheel of the supporting beam to drive the supporting beam to move along the extension direction of the ground rail. The shelf group is connected to two adjacent supporting beams below and the adjacent edges of adjacent shelf groups are located on the same supporting beam.

[0009] The extension direction of the ground rail is the front-rear direction, and a plurality of goods shelf modules are arranged in sequence in the front-rear direction on the ground rail.

[0010] In the scheme, by setting connecting rods between multiple shelf groups, driving the driving wheels by driving motors, and driving all shelf groups by connecting rods, one driving motor can stably drive multiple shelf groups at the same time, so there is no need to add too many driving motors. When the movable shelves fail during daily use, they can be quickly repaired. The scheme can avoid the problems of unstable start and easy goods dumping caused by the synchronization difference between driving motors when each shelf group is driven by an independent driving motor. It can also avoid damage to some driving motors due to the synchronization difference between multiple driving motors. In addition, by setting the supporting beams below the adjacent edges of adjacent shelves, the connection between the connected shelves has the same running speed, reducing the probability of deformation of multiple shelf groups. In the scheme, the selection of the driving motor is determined according to the designed load of the shelf module.

[0011] As an extension of the above scheme, the driving motor is arranged on the middle supporting beam of the multiple supporting beams. Specifically, it is arranged on the middle one of the multiple supporting beams, or on any one of the two middle supporting beams. For example, in some cases, the number of shelf groups is even, and the number of supporting beams used is odd. The driving motor is arranged on the middle supporting beam. In some cases, the number of shelf groups is odd, and the number of supporting beams used is even. The driving motor is arranged on any one of the two middle supporting beams. In this scheme, the driving motor is arranged in the middle, which can reduce the loss of driving force of the driving motor during transmission.

[0012] As an extension of the above scheme, the driving motor has coaxial first and second output shafts. The first output shaft is arranged on the opposite side of the second output shaft. The first output shaft is connected to the driving wheel, and the second output shaft is connected to the connecting rod and the driving wheel on the opposite side of the supporting beam through the connecting rod. By such arrangement, the driving motor directly drives one of the driving wheels, which can further reduce the loss of driving force of the driving motor during transmission.

[0013] As an extension of the above scheme, a movable shelf further includes a sensor connected to the shelf module. Specifically, the sensor is electrically connected to a control module arranged outside the shelf module. The control module is electrically connected to the driving motor. The control module is arranged outside the shelf module.

[0014] Because sensors are installed on the shelf module, when the sensors detect a person approaching or goods falling during movement, they can output a signal to the control module. The control module then controls the motor to stop suddenly, which improves production safety, effectively prevents personnel injury, and prevents goods from being crushed by the moving shelf module after falling, thus avoiding safety accidents.

[0015] In addition, during the forward and backward movement of a certain shelf module, the sensor can detect the distance between the moving shelf module and the adjacent shelf module in the direction of movement, and output a signal to the control module. The control module outputs a signal to the drive motor, so that as the moving shelf module gradually approaches the adjacent shelf module, the braking force of the drive motor is controlled to make the moving shelf module smoothly contact the adjacent shelf module, thus avoiding damage to the adjacent shelf module by one of the shelf modules due to its own inertia during the movement.

[0016] Working principle:

[0017] Users input control commands through an external control module;

[0018] The control module outputs a signal to make the drive motor run;

[0019] During movement, the sensor detects the distance to obstacles in the direction of movement;

[0020] The sensor transmits the distance signal back to the control module;

[0021] When the distance reaches a certain set value, the control module outputs a signal to control the drive motor to decelerate. When the moving shelf module comes into contact with an adjacent shelf module, the control module outputs a signal to control the drive motor to slowly reverse and then quickly stop rotating.

[0022] As an extension of the above solution, the shelving unit includes two shelving units arranged front to back. This arrangement allows each shelving module to include two rows of shelving units arranged front to back, with each row containing multiple shelving units. In essence, one drive motor drives multiple shelving units to move simultaneously, which greatly reduces the number of drive motors required, effectively lowers economic costs, and makes the shelving operation smoother.

[0023] Especially in some storage warehouses, the storage space has sufficient depth to allow for the installation of multiple rows of back-to-back shelving modules, but not enough length to arrange multiple shelving groups in the left-right direction. Therefore, the configuration method of this solution is conducive to expanding storage capacity in a limited storage space, which can greatly reduce the number of drive motors used and effectively reduce economic costs.

[0024] As an extension of the above scheme, the supporting beam is a U-shaped square tube, the notch of the U-shaped square tube faces downward, and the driving wheel and the driven wheel are arranged in the notch of the U-shaped square tube and are rotationally connected to the two side walls of the U-shaped square tube.

[0025] Specifically, the U-shaped square tube is placed with the opening facing downward, and in particular, the gap between the edge of the U-shaped square tube and the ground is set to be small, so that the track can be covered in the supporting beam as much as possible, and foreign matter falling onto the track can be avoided as much as possible.

[0026] As an extension of the above scheme, the lower edges of the left and right sides of the U-shaped square tube extend outwardly with first extension plates, and fixed baffle plates are arranged at the front and rear ends of the U-shaped square tube. The fixed baffle plate comprises a vertically arranged side plate, an upper plate, and a lower plate. The upper plate is connected to the top of the side plate, and the lower plate is connected to the bottom of the side plate. The U-shaped square tube is located between the upper plate and the lower plate. The upper plate is crimped on the top surface of the end of the U-shaped square tube, and the lower plate supports the end of the U-shaped square tube and the first extension plate. This scheme can further prevent foreign matter from entering between the track and the U-shaped square tube, and can enhance the load-bearing capacity of the supporting beam by connecting the upper and lower end surfaces of the U-shaped square tube with the fixed baffle plates.

[0027] As an extension of the above scheme, the inner wall of the U-shaped square tube is connected with a plurality of support columns. This can further enhance the load-bearing capacity of the supporting beam and prevent deformation.

[0028] As an extension of the above scheme, a support clamping plate is arranged in the U-shaped square tube, and the support clamping plate is connected to the two side inner walls and the top inner wall of the U-shaped square tube. The support clamping plate is a rectangular thin plate member, and the thickness thereof extends in the front-rear direction. This can further enhance the load-bearing capacity of the supporting beam based on the above scheme. In addition, since the legs of the shelf are connected to the U-shaped square tube when the shelf is connected to the U-shaped square tube, the support clamping plate can be arranged below the legs of the shelf, so that the load-bearing capacity of the U-shaped square tube can be improved with a smaller number of support clamping plates.

[0029] As an extension of the above scheme, flange couplings are connected to the two sides of the driving wheel. The flange couplings are arranged on the driving wheel to facilitate connection of a power source to the driving wheel.

[0030] The movable shelf provided by the utility model sets the driving device on the supporting beam below the middle one of the plurality of shelf groups, and transmits power to the other shelves through the transmission device, so that one driving motor drives the plurality of shelf groups to run simultaneously, and the plurality of shelf groups can be moved more stably. BRIEF DESCRIPTION OF DRAWINGS

[0031] The utility model makes further explanation in combination with the drawings and examples;

[0032] Figure 1 It is the whole schematic view of the movable shelf provided by the utility model;

[0033] Figure 2 It is the partial schematic view of the movable shelf provided by the utility model;

[0034] Figure 3 It is the supporting beam schematic view provided by the example;

[0035] Figure 4 It is the fixed baffle schematic view provided by the example.

[0036] In the drawings: 100, ground rail, 200, shelf module, 201, shelf group, 2011, shelf, 202, driving motor, 203, supporting beam, 2031, U-shaped square tube, 20311, first extension plate, 2032, driving wheel, 20321, flange coupling, 2033, driven wheel, 2034, fixed baffle, 20341, side plate, 20342, upper plate, 20343, lower plate, 2035, support column, 2036, support clamping plate, 204, connecting rod, 300, sensing module, 301, control module, 302, sensor. DETAILED DESCRIPTION

[0037] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0038] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated device or element must have a specific orientation, a specific orientation and operation, so it cannot be understood as the limitation of the utility model.

[0039] In the description of the utility model, if there is a word such as “several” description, its meaning is one or more, the meaning of more than two, greater than, less than, exceed and so on are not included in the number, above, below, within and so on are understood as including the number.

[0040] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the specific meaning of the above words in the utility model can be reasonably determined by the person skilled in the art in combination with the specific content of the technical scheme.

[0041] Referring to Figures 1 to 4 , the following will give several embodiments of a movable shelf of the utility model.

[0042] As Figures 1 to 4 indicated, a movable shelf comprises:

[0043] Ground rail 100, a plurality of ground rails 100 are parallel and uniformly distributed;

[0044] Shelf module 200, the shelf module 200 comprises a plurality of connected shelf groups 201, a plurality of supporting beams 203, a driving motor 202 and a connecting rod 204, the supporting beam 203 is arranged on the ground rail 100 through the driving wheel 2032 and the driven wheel 2033, each supporting beam 203 is connected with one ground rail 100, the supporting beam 203 is arranged in parallel with the ground rail 100, the driving wheels 2032 on adjacent supporting beams 203 are connected through the connecting rod 204, the driving motor 202 is connected with any supporting beam 203, the driving motor 202 is in transmission connection with the driving wheel 2032 of the supporting beam 203 to drive the supporting beam 203 to move along the extension direction of the ground rail 100, two adjacent supporting beams 203 are connected below the shelf group 201, and the adjacent edges of adjacent shelf groups 201 are located on the same supporting beam 203;

[0045] The extension direction of the ground rail 100 is the front-rear direction, and a plurality of shelf modules 200 are arranged in sequence in front of and behind the ground rail 100. The length of the ground rail 100 is greater than the total length of the plurality of shelf modules 200, so as to leave a space for the movement of the shelf module to facilitate the staff to take out goods.

[0046] The supporting beam 203 is a U-shaped square tube 2031, the notch of the U-shaped square tube 2031 faces downward, the driving wheel 2032 and the driven wheel 2033 are arranged in the notch of the U-shaped square tube 2031 and are in rotary connection with the U-shaped square tube 2031, the ground rail 100 can be covered in the supporting beam 203 as much as possible, and foreign matters can be avoided from falling on the ground rail 100 as much as possible.

[0047] And the flange coupling 20321 is connected on both sides of the driving wheel 2032, which is convenient for connecting the driving source for the driving wheel 2032.

[0048] The driving motor 202 has coaxial output first output shaft and second output shaft, the first output shaft is arranged on the opposite side of the second output shaft, the first output shaft is connected with the driving wheel 2032, and the second output shaft is connected with the connecting rod 204 and the driving wheel 2032 on the opposite side of the supporting beam 203 through the connecting rod 204. By such arrangement, the driving motor 202 is used to directly drive one of the driving wheels 2032, which can further reduce the loss of driving force of the driving motor 202 in the transmission process. The flange coupling 20321 is also arranged on the first output shaft and the second output shaft, and the flange coupling 20321 is also arranged at both ends of the connecting rod 204.

[0049] In the scheme, by arranging the connecting rod 204 between the plurality of shelf groups 201, driving the driving wheel 2032 by the driving motor 202, and driving all the shelf groups 201 at the same time through the connecting rod transmission, one driving motor 202 can be used to stably drive the plurality of shelf groups 201 at the same time, without arranging too many driving motors 202. When the movable shelf fails during daily use, it can be quickly repaired. The scheme can also avoid the problems of unstable start and easy goods falling caused by the synchronization difference between the driving motors 202 when the shelf groups 201 are driven by independent driving motors 202, and can avoid the damage of part of the driving motors 202 caused by the synchronization difference between the plurality of driving motors 202. Especially in some storage warehouses, the storage site has enough depth to allow the arrangement of multiple rows of front and rear arranged shelf modules, but does not have enough length to arrange multiple shelf groups in the left and right directions. The arrangement of the scheme is beneficial to expanding the storage capacity in a limited area of the storage site, can greatly reduce the number of driving motors used, and can effectively reduce the economic cost. In addition, by arranging the supporting beam 203 below the adjacent edges of the adjacent shelf groups, the connection of the connected shelf groups 201 has the same running speed, which reduces the probability of deformation of the connection of the plurality of shelf groups 201.

[0050] In the scheme, the selection of the driving motor is determined according to the designed load of the shelf module.

[0051] As a more preferred and conventional production case, the number of shelf groups 201 can be set to three or four or five. When the number of shelf groups 201 is three, the number of supporting beams 203 used is four, and the number of shelves 2011 actually driven by the driving motor 202 is six.

[0052] When the number of the shelf groups 201 is four, the number of the support beams 203 used is five, and the number of the shelves 2011 actually driven by one driving motor 202 is eight.

[0053] When the number of the shelf groups 201 is five, the number of the support beams 203 used is six, and the number of the shelves 2011 actually driven by one driving motor 202 is ten.

[0054] In some embodiments, the driving motor 202 is arranged at the middle position of the shelf module 200. For example, when the number of the shelf groups 201 is three, the number of the support beams 203 used is four, and the driving motor 202 is arranged at one of the second support beam 203 or the third support beam 203.

[0055] For another example, when the number of the shelf groups 201 is four, the number of the support beams 203 used is five, and the driving motor 202 is arranged at the third support beam 203.

[0056] For another example, when the number of the shelf groups 201 is five, the number of the support beams 203 used is six, and the driving motor 202 is arranged at one of the third support beam 203 or the fourth support beam 203. By arranging the driving motor 202 at the middle position, the loss of the driving force of the driving motor 202 during transmission can be reduced. Those skilled in the art can understand that the driving motor 202 matches a corresponding number of shelf groups 201, and according to the performance of the driving motor 202, the number of the shelf groups 201 can also be greater than six.

[0057] In some embodiments, the movable shelf further comprises a sensing module 300, the sensing module 300 comprises a control module 301 and a sensor 302, the sensor 302 is connected with the shelf module 200, the sensor 302 is electrically connected with the control module 301, the control module 301 is electrically connected with the driving motor 202, and the control module 301 is arranged outside the shelf module 200. The sensor 302 is arranged at both sides of any shelf group 201.

[0058] Because the sensor 302 is arranged on the shelf module 200, when the sensor 302 on the shelf module 200 detects that someone approaches or goods falls during movement, a signal can be output to the control module 301, the control module 301 controls the driving motor 202 to stop urgently, which can improve production safety, effectively avoid personnel injury and avoid the moved shelf module 200 being damaged after goods falls, and avoid safety accidents.

[0059] In addition, during the movement of a certain shelf module 200, the sensor 302 can detect the distance between the moving shelf module 200 and the adjacent shelf module 200 in the moving direction, and output a signal to the control module 301, and the control module 301 outputs a signal to the drive motor 202, so that the moving shelf module 200 can gradually approach the adjacent shelf module 200, and can be controlled by the braking force of the drive motor 202 according to the set program, so that the moving shelf module 200 can stably contact the adjacent shelf module 200, and avoid that one of the shelf modules 200 damages the adjacent shelf module 200 due to its own inertia during the movement.

[0060] Working principle:

[0061] The user inputs a control instruction through the external control module 301;

[0062] The control module 301 outputs a signal to make the drive motor 202 run;

[0063] During the movement, the sensor 302 detects the distance to the obstacle in the moving direction;

[0064] The sensor 302 returns the distance signal to the control module 301;

[0065] When the distance reaches a certain set value, the control module 301 outputs a signal to control the drive motor 202 to slow down, and when the moving shelf module 200 contacts the adjacent shelf module 200, the control module 301 outputs a signal to control the drive motor 202 to slowly reverse, and then quickly stop rotating.

[0066] Further, the sensor 302 is connected to the shelf group 201 located at the edge. By arranging the sensor 302 on the shelf group 201 located at the edge, fewer sensors 302 can be used to achieve more comprehensive detection.

[0067] In some embodiments, the lower edges of the U-shaped square tubes 2031 on the left and right sides extend outwardly with first extension plates 20311, and fixed baffle plates 2034 are arranged at the front and rear ends of the U-shaped square tubes 2031, the fixed baffle plates 2034 include vertically arranged side plates 20341, upper plates 20342 and lower plates 20343, the upper plates 20342 are connected with the top of the side plates 20341, the lower plates 20343 are connected with the bottom of the side plates 20341, the U-shaped square tubes 2031 are located between the upper plates 20342 and the lower plates 20343, the upper plates 20342 are crimped on the top surface of the end of the U-shaped square tubes 2031, and the lower plates 20343 receive the end of the U-shaped square tubes 2031 and the first extension plates 20311.

[0068] By connecting the fixed baffle plates 2034 at the front and rear ends of the U-shaped square tubes 2031, firstly, larger foreign matters can be prevented from entering between the ground rail 100 and the U-shaped square tubes 2031, and secondly, by extending the lower edges of the U-shaped square tubes 2031 outwardly with the first extension plates 20311 and connecting the upper and lower end surfaces of the U-shaped square tubes 2031 with the fixed baffle plates 2034, the load bearing capacity of the support beam 203 can be enhanced.

[0069] Further, the side walls of the U-shaped square tubes 2031 are connected with a plurality of uniformly distributed support columns 2035 arranged at the edges of the notches of the U-shaped square tubes 2031, so that the deformation resistance of the U-shaped square tubes 2031 is improved, and the support beam 203 made of the U-shaped square tubes 2031 can bear heavier weight.

[0070] Still further, support clamping plates 2036 are arranged in the U-shaped square tubes 2031 and connected with the inner walls on the left and right sides and the top of the U-shaped square tubes 2031. The support clamping plates 2036 are rectangular thin plate members, and the thickness thereof extends in the front-rear direction. By such arrangement, the load bearing capacity of the support beam 203 can be further improved.

[0071] In addition, since the legs of the shelf are connected with the U-shaped square tubes 2031 when the shelf is connected with the U-shaped square tubes 2031, the support clamping plates 2036 can be arranged below the legs of the shelf, so that the load bearing capacity of the U-shaped square tubes 2031 can be improved with a smaller number of support clamping plates 2036.

[0072] The preferred embodiments of the utility model are described in detail above, but the utility model creation is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the present application.

Claims

1. A mobile shelving unit, characterized in that, The utility model relates to a kind of shelf module and shelf group, including: Ground rail (100), several described ground rail (100) are parallel and uniformly distributed in interval; Shelf module (200), the shelf module (200) includes several connected shelf groups (201), several support beams (203), drive motor (202), connecting rod (204), the support beam (203) is arranged on the ground rail (100) by driving wheel (2032) and driven wheel (2033), each support beam (203) is connected to a ground rail (100), the support beam (203) is arranged in parallel with the ground rail (100), the driving wheel (2032) on adjacent support beam (203) is connected by connecting rod (204), drive motor (202) is connected with any support beam (203), drive motor (202) and the driving wheel (2032) of the support beam (203) of location transmission connection drive support beam (203) movement in the direction of extension of ground rail (100), the shelf group (201) is connected below two adjacent support beams (203), and adjacent edge of adjacent shelf group (201) is located on the same support beam (203); With the direction of extension of the ground rail (100) as front-back direction, multiple shelf module (200) is sequentially arranged in front-back direction on the ground rail (100).

2. The mobile shelving of claim 1, wherein: The drive motor (202) is arranged on the central support beam (203) of multiple support beams (203).

3. The mobile shelving unit of claim 2, wherein: The drive motor (202) has coaxial output first output shaft and second output shaft, the first output shaft is located on the opposite side of the second output shaft, the first output shaft is connected with the driving wheel (2032), and the second output shaft is connected with the connecting rod (204) and the driving wheel (2032) on the opposite side of the connecting rod (204) is connected.

4. The mobile shelving unit of claim 1, wherein: It further includes inductor (302), and the inductor (302) is connected with the shelf module (200).

5. The mobile shelving unit of claim 1, wherein: The shelf group (201) includes two shelves (2011) arranged in front-back direction.

6. The mobile shelving unit of claim 1, wherein: The support beam (203) is U-shaped square tube (2031), the notch of the U-shaped square tube (2031) faces downward, and the driving wheel (2032) and the driven wheel (2033) are arranged in the notch of the U-shaped square tube (2031) and are rotatably connected with the two side walls of the U-shaped square tube (2031).

7. The mobile shelving unit of claim 6, wherein: The lower edges of the left and right sides of the U-shaped square tube (2031) extend outwardly with first extension plates (20311), the front and rear ends of the U-shaped square tube (2031) are provided with fixed baffle plates (2034), the fixed baffle plates (2034) comprise vertically arranged side plates (20341), upper plates (20342) and lower plates (20343), the upper plates (20342) are connected with the top of the side plates (20341), the lower plates (20343) are connected with the bottom of the side plates (20341), the U-shaped square tube (2031) is located between the upper plates (20342) and the lower plates (20343), the upper plates (20342) are crimped on the top surface of the end of the U-shaped square tube (2031), and the lower plates (20343) support the end of the U-shaped square tube (2031) and the first extension plates (20311).

8. The mobile shelving unit of claim 6, wherein: The side walls of the U-shaped square tube (2031) are connected with a plurality of uniformly distributed support columns (2035).

9. The mobile shelving unit of claim 6, wherein: The U-shaped square tube (2031) is provided with a support clamping plate (2036) therein, the support clamping plate (2036) is a sheet member, and the support clamping plate (2036) is connected with the inner walls of the two sides and the top of the U-shaped square tube (2031) at the same time.

10. The mobile shelving unit of claim 1, wherein: Flange couplings (20321) are connected to the two sides of the driving wheel (2032).

Images