Vehicle-mounted camera assembly calibration equipment

Abstract

The invention relates to the technical field of camera calibration, and discloses a vehicle-mounted camera assembly calibration device which comprises a workbench, a fixing plate is fixedly installed at the rear end of the upper surface of the workbench, two supporting bases are symmetrically arranged at the lower end of the workbench, and a motor is fixedly arranged on the rear side of the fixing plate. A first bevel gear is mounted on an output end shaft of the motor, and a second bevel gear is arranged on the side face of the first bevel gear in an engaged mode. According to the vehicle-mounted camera assembly calibration equipment, a first electric telescopic rod works to drive a movable rack to move, so that a rotating plate starts to rotate and unfold, a rotating connecting plate is rotated, a movable sleeve is driven to move through an adjusting screw rod, the rotating connecting plate can be driven to move in the direction close to wheels, and the purpose of automatically aligning the middle position in front of a vehicle is achieved; during alignment, the rotary baffle is linked to rotate, the calibration plate is conveniently installed and fixed subsequently, the rotary baffle can be fixed in an auxiliary mode along with installation of the calibration plate, and the stability of the rotary baffle during use is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of camera calibration, and in particular to a vehicle-mounted camera component calibration device. Background Art

[0002] With the rapid development of transportation, intelligent assisted driving has also developed rapidly. Intelligent assisted driving is mainly realized by on-board camera components. Calibration of on-board camera components can ensure vehicle safety and improve the accuracy and reliability of driving assistance systems. Regular calibration can promptly detect and repair potential problems in camera components, thereby extending their service life.

[0003] At present, the patent with announcement number CN117459714A discloses a calibration device for a vehicle-mounted camera, including a base, a plurality of groups of legs are threadedly connected to the bottom of the base, a first receiving groove is provided on the side wall of the base, a positioning component is slidably connected inside the first receiving groove, a screw rod groove is provided on the base, a screw rod is rotatably connected to the inner wall of the screw rod groove, a motor is fixedly connected to the side wall of the base, an output end of the motor is transmission-connected to the end of the screw rod, a height adjustment mechanism is meshedly connected to the screw rod, a calibration component is arranged on the height adjustment mechanism, and a calibration plate is movably connected to the calibration component; by The device is placed in front of the car, and the mobile box is pulled out. By rotating the hand wheel, the rotating shaft drives the driving gear rotating shaft, and the driven gear drives the positioning bracket to rotate to a direction perpendicular to the ground. By pulling the pull ring, the pull rod pulls the two sets of linkage rods, so that the two sets of card blocks enter the interior of a set of first limit grooves respectively. Through the tension of the two sets of first torsion springs, the two sets of benchmarks are popped out and rotated to a position parallel to the ground. The base is moved to make the positioning bracket fit the front bumper of the car, and the height of the legs is rotated to adjust the height so that the two sets of benchmarks are kept parallel to the car. When the device is calibrating the camera, it is kept in a relatively parallel position with the vehicle, thereby improving the accuracy of camera calibration.

[0004] However, the following problems still exist during the use of the above-mentioned vehicle-mounted camera calibration device: during the use of the calibration device, the device needs to be moved to the middle position directly in front of the vehicle to continue calibration. When the above-mentioned device is used, there is a lack of positioning structure, so it is necessary to manually judge whether the moved position has reached the specified position. This is not only very time-consuming and labor-intensive, but also has large errors, making it difficult to ensure the calibration effect of the vehicle-mounted camera assembly. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a vehicle-mounted camera assembly calibration device, which is automatically clamped and positioned so that the device is located in the middle position directly in front of the vehicle, thereby effectively ensuring the calibration effect of the vehicle-mounted camera assembly.

[0006] The present invention provides the following technical solution: a vehicle-mounted camera assembly calibration device, comprising a workbench, a fixed plate is fixedly installed at the rear end position of the upper surface of the workbench, and two supporting bases are symmetrically arranged at the lower end of the workbench, a motor is fixedly arranged on the rear side of the fixed plate, and a first bevel gear is installed on the output end shaft of the motor, and a second bevel gear is meshed with the side of the first bevel gear, an adjusting screw is installed on the middle position shaft of the second bevel gear, and the adjusting screw is rotatably connected to the workbench, a movable sleeve is arranged on the outside of the adjusting screw, and a driving plate is fixedly installed on the movable sleeve, a first electric telescopic rod is fixedly installed on the driving plate, and a moving rack is fixedly installed on the first electric telescopic rod, and a rotating plate is meshed with the moving rack, the rotating plate is rotatably arranged on the driving plate, a fixed shaft is fixedly installed on the rotating plate, and a rotating connecting plate is arranged on the outside of the fixed shaft, a pressure sensor is fixedly installed on the rotating connecting plate, a positioning rod is penetrated by the rotating connecting plate, and a connecting plate is fixedly installed on the upper end of the positioning rod, an extrusion spring is fixedly installed on the lower end of the connecting plate, and the extrusion spring is fixedly installed on the rotating connecting plate.

[0007] Furthermore, two lifting hydraulic rods are symmetrically installed on the left and right sides of the fixed plate, and a receiving plate is fixedly installed on the upper end of the lifting hydraulic rod. Through the above structure, it is convenient to drive the receiving plate to move up and down through the lifting hydraulic rod, so as to adjust the use height of the receiving plate.

[0008] Furthermore, cylindrical grooves are provided on the left and right sides of the workbench, and a guide rod is fixedly installed on the driving plate. The outer surface of the guide rod is set to be smooth, and the guide rod is slidably connected to the workbench through the cylindrical grooves provided on the workbench. Through the above structure, it is convenient to guide and limit the driving plate through the guide rod to avoid the driving plate from rotating during the movement.

[0009] Furthermore, the first bevel gear is coaxially fixedly mounted with a pulley group, and the pulley group shaft is connected to a gear group, and the gear group is composed of two mutually meshing gears, and both gears are rotatably mounted on a receiving plate. Through the above structure, it is convenient to drive the gear group to move through the pulley group.

[0010] Furthermore, the gear set is meshingly connected with a rotating baffle, a gear structure is provided on the rotating baffle, and two rotating baffles are symmetrically provided about the center of the receiving plate, and the rotating baffle and the receiving plate form a rotating connection. Through the above structure, it is easy to drive the rotating baffle to rotate, thereby realizing the storage and deployment of the rotating baffle.

[0011] Furthermore, a penetrating positioning hole is provided on the rotating baffle, and a limiting rod is fitted in the positioning hole provided on the rotating baffle, a pressing plate is fixedly installed on the upper end of the limiting rod, and a pushing spring is fixedly installed on the lower end of the pressing plate, and an assembling plate is provided on the lower end of the pushing spring, and the assembling plate is fixedly installed on the supporting plate. Through the above structure, the rotating baffle can be easily engaged and positioned by the limiting rod, thereby preventing the rotating baffle from rotating during use.

[0012] Furthermore, a sliding guide rod is fixedly installed on the rotating baffle, and a pushing spring is fixedly installed on the sliding guide rod, and the pushing spring is fixedly installed on the pushing plate. A sliding groove is provided on the pushing plate, and the pushing plate is slidably connected to the sliding guide rod through the sliding groove. Through the above structure, it is convenient for the pushing plate to slide on the sliding guide rod, thereby clamping and fixing the calibration plate.

[0013] Furthermore, a clamping rod is fixedly installed on the pushing plate, and a calibration plate is fitted on the clamping rod, and a pressing plate is fixedly installed at the rear side of the calibration plate. Through the above structure, the calibration plate can be stably fixed under the action of the clamping rod.

[0014] Furthermore, a second electric telescopic rod is fixedly installed on the upper end of the fixed plate, and an adding plate is fixedly installed on the second electric telescopic rod, and a push pulley is rotatably installed on the adding plate, and the push pulley and the belt constituting the pulley group are in contact with each other. Through the above structure, it is convenient to drive the push pulley to move through the adding plate, so that the belt constituting the pulley group is always in a taut state.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The vehicle-mounted camera assembly calibration device drives the moving rack to move through the operation of the first electric telescopic rod, so that the rotating plate starts to rotate and unfold, and then the rotating connecting plate is rotated, and the moving sleeve is driven to move by the adjusting screw, and the rotating connecting plate can be driven to move in the direction close to the wheel until the connecting plate is tightly fitted with the wheel. At this time, the fixed shaft and the rotating connecting plate can be engaged and fixed to achieve the purpose of automatically aligning to the middle position directly in front of the vehicle, which is more convenient and accurate. At the same time, the rotating baffle is rotated in conjunction with the alignment, so as to facilitate the subsequent installation and fixation of the calibration plate. With the installation of the calibration plate, the rotating baffle can be auxiliary fixed to ensure the stability of the rotating baffle when in use. The use height of the receiving plate can be adjusted, so that vehicle-mounted camera assemblies of different heights can be calibrated, thereby increasing the use range of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2It is a schematic diagram of the three-dimensional cross-sectional structure of the receiving plate of the present invention; Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the clamping rod of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the rotating baffle of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the push pulley of the present invention; Figure 6 It is a schematic diagram of the three-dimensional cross-sectional structure of the adjusting screw of the present invention; Figure 7 It is a schematic diagram of the three-dimensional cross-sectional structure of the rotary joint plate of the present invention; Figure 8 It is a schematic diagram of the three-dimensional cross-sectional structure of the rotary joint plate of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional cross-sectional structure of the positioning rod of the present invention; Fig.10 It is a schematic diagram of the three-dimensional cross-sectional structure of the connecting slider of the present invention.

[0017] In the figure: 1, workbench; 2, fixed plate; 3, lifting hydraulic rod; 4, receiving plate; 5, motor; 6, first bevel gear; 7, second bevel gear; 8, adjusting screw; 9, moving sleeve; 10, driving plate; 11, guide rod; 12, first electric telescopic rod; 13, moving rack; 14, rotating plate; 15, fixed shaft; 16, rotating connecting plate; 17, connecting slider; 18, adsorption magnet; 19, pressure sensor; 20, positioning rod; 21, connecting plate; 22, extrusion spring; 23, pulley group; 24, gear group; 25, rotating baffle; 26, limiting rod; 27, pressing plate; 28, ejection spring; 29, assembling plate; 30, sliding guide rod; 31, pushing spring; 32, pushing plate; 33, clamping rod; 34, calibration plate; 35, second electric telescopic rod; 36, adding plate; 37, push pulley; 38, supporting base. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figure 1-Figure 10The present invention provides a technical solution: a vehicle-mounted camera assembly calibration device, comprising a workbench 1, a fixed plate 2 is fixedly installed at the rear end position of the upper surface of the workbench 1, and two supporting bases 38 are symmetrically arranged at the lower end of the workbench 1, a motor 5 is fixedly arranged on the rear side of the fixed plate 2, and a first bevel gear 6 is installed on the output end shaft of the motor 5, and a second bevel gear 7 is meshed with the side of the first bevel gear 6, an adjusting screw 8 is installed on the middle position shaft of the second bevel gear 7, and the adjusting screw 8 is rotatably connected to the workbench 1, a moving sleeve 9 is arranged outside the adjusting screw 8, and a driving plate 10 is fixedly installed on the moving sleeve 9, a first electric telescopic rod 12 is fixedly installed on the driving plate 10, and a moving rack 13 is fixedly installed on the first electric telescopic rod 12, and a rotating plate 14 is meshed with the moving rack 13, and the rotating plate 14 is rotatably arranged on the driving plate 10, a fixed shaft 15 is fixedly installed on the rotating plate 14, and a rotating connecting plate 16 is arranged outside the fixed shaft 15, a pressure sensor 19 is fixedly installed on the rotating connecting plate 16, a positioning rod 20 is penetrated through the rotating connecting plate 16, and a connecting plate 21 is fixedly installed on the upper end of the positioning rod 20, an extrusion spring 22 is fixedly installed on the lower end of the connecting plate 21, and the extrusion spring 22 is fixedly installed on the rotating connecting plate 16, two lifting hydraulic rods 3 are symmetrically installed on the left and right sides of the fixed plate 2, and a receiving plate 4 is fixedly installed on the upper end of the lifting hydraulic rod 3, cylindrical grooves are opened on the left and right sides of the workbench 1, and a guide rod 11 is fixedly installed on the driving plate 10, the outer surface of the guide rod 11 is set to be smooth, and the guide rod 11 is slidably connected with the workbench 1 through the cylindrical groove opened on the workbench 1.

[0020] When the device needs to be used, the first electric telescopic rod 12 starts working, because the moving rack 13 is fixedly installed on the first electric telescopic rod 12, and the moving rack 13 starts to move at this time, because the moving rack 13 is meshed with the rotating plate 14 through the gear structure provided on the rotating plate 14. Therefore, as the moving rack 13 moves, the rotating plate 14 starts to rotate until the rotating plate 14 rotates ninety degrees. At this time, the rotating plate 14 begins to be in a vertical state with the driving plate 10, and then the rotating connecting plate 16 is rotated. At this time, the rotating connecting plate 16 starts to rotate around the fixed axis 15. Under the action of the connecting slider 17, the rotating connecting plate 16 can be supported and limited. At this time, the connecting slider 17 is no longer adsorbed with the adsorption magnet 18 (the connecting slider 17 is set to a material that can be adsorbed by a magnet, such as iron, cobalt, nickel, etc.). After the rotating connecting plate 16 rotates ninety degrees, the connecting plate 21 faces the position of the tire, and then the motor 5 starts to work, because the output end of the motor 5 is connected to the first bevel gear 6, and the first bevel gear The wheel 6 is meshed with the second bevel gear 7, and the second bevel gear 7 starts to rotate. Because the second bevel gear 7 is installed on the adjusting screw 8, the adjusting screw 8 starts to rotate. Because the adjusting screw 8 is connected to the moving sleeve 9 through the threaded hole opened inside the moving sleeve 9, the moving sleeve 9 starts to drive the driving plate 10 to move under the limiting action of the guide rod 11, and the connecting plate 21 starts to move in the direction close to the wheel until the connecting plate 21 is tightly fitted with the wheel. Because the connecting plate 21 is equipped with a positioning rod 20, the positioning rod 20 starts to move, that is, the positioning rod 20 starts to fit with the hole opened on the fixed shaft 15, and the extrusion spring 22 installed at the lower end of the connecting plate 21 starts to be squeezed and deformed, and the connecting plate 21 fits with the pressure sensor 19. At this time, the pressure sensor 19 is subjected to pressure and starts to stop the motor 5 from working. At this time, the workbench 1 is located in the middle position in front of the vehicle, so as to achieve the purpose of automatically calibrating the position of the device and avoid the device from being offset during use and affecting the calibration effect of the vehicle-mounted camera.

[0021] The first bevel gear 6 is coaxially fixedly installed with a pulley set 23, and the pulley set 23 axis is connected to a gear set 24, and the gear set 24 is composed of two gears meshing with each other, and both gears are rotatably installed on the receiving plate 4, the gear set 24 is meshingly connected with a rotating baffle 25, the rotating baffle 25 is provided with a gear tooth structure, and two rotating baffles 25 are symmetrically provided about the center of the receiving plate 4, and the rotating baffle 25 is rotatably connected with the receiving plate 4, a penetrating positioning hole is provided on the rotating baffle 25, and a limiting rod 26 is fitted in the positioning hole provided on the rotating baffle 25, and a pressing plate is fixedly installed on the upper end of the limiting rod 26 27, and a push-out spring 28 is fixedly installed at the lower end of the pressing plate 27, and an assembling plate 29 is arranged at the lower end of the pushing spring 28, the assembling plate 29 is fixedly installed on the receiving plate 4, a sliding guide rod 30 is fixedly installed on the rotating baffle 25, and a pushing spring 31 is fixedly installed on the sliding guide rod 30, and the pushing spring 31 is fixedly installed on the pushing plate 32, a sliding groove is provided on the pushing plate 32, and the pushing plate 32 is slidably connected with the sliding guide rod 30 through the sliding groove, a clamping rod 33 is fixedly installed on the pushing plate 32, and a calibration plate 34 is fitted on the clamping rod 33, and the pressing plate 27 is fixedly installed at the rear side of the calibration plate 34.

[0022] As the adjusting screw 8 drives the movable sleeve 9 to move toward the workbench 1, the pulley set 23 coaxially connected to the first bevel gear 6 begins to rotate. Because the pulley set 23 is coaxially connected to the gear set 24, the gear set 24 begins to rotate. The gear set 24 is composed of two gears. At this time, the gear on the left rotates counterclockwise, and the gear on the right rotates clockwise, that is, the rotating baffle 25 engaged with the two gears begins to rotate, that is, the two rotating baffles 25 begin to rotate and open. Figure 4 When the position is rotated to Figure 4The position is in the middle position, at this time, the rotation of the gear set 24 will not drive the rotating baffle 25 to continue to rotate, and then the push plate 32 is pulled, and the push plate 32 begins to slide on the sliding guide rod 30. Because the push plate 32 is fixedly installed with a push spring 31, and the push spring 31 is fixedly installed on the push plate 32, at this time, the push spring 31 begins to be squeezed and deformed, and then the calibration plate 34 is placed in the middle position between the two push plates 32, and the pressing plate 27 installed on the rear side of the calibration plate 34 moves toward the direction close to the assembling plate 29 (the assembling plate 29 is fixedly installed on the receiving plate 4), and the limiting rod 26 is installed at the lower end of the pressing plate 27, so that the limiting rod 26 passes through the assembling plate 29, first make the clamping rod 33 on the unstretched side fit with the groove on the calibration plate 34, and then release it. The stretched push plate 32 begins to move towards the calibration plate 34 under the action of the push spring 31 restoring the deformation. During this process, the calibration plate 34 is pressed, and the push-out spring 28 installed at the lower end of the pressing plate 27 begins to be squeezed and deformed (the push-out spring 28 is fixedly connected to the pressing plate 27, and the push-out spring 28 and the upper surface of the assembly plate 29 fit each other). As the pressing plate 27 moves downward, the limiting rod 26 begins to fit each other with the through positioning hole opened on the rotating baffle 25, so that the rotating baffle 25 can be fixed again, thereby effectively ensuring the stability of the rotating baffle 25 during use, until the clamping rod 33 engages and fixes the calibration plate 34 on the other side, at which time the calibration plate 34 can be installed and fixed.

[0023] A second electric telescopic rod 35 is fixedly mounted on the upper end of the fixed plate 2, and an adding plate 36 is fixedly mounted on the second electric telescopic rod 35, and a push pulley 37 is rotatably mounted on the adding plate 36, and the push pulley 37 is in contact with the belt constituting the pulley group 23.

[0024] When it is necessary to adjust the height of the calibration plate 34, the lifting hydraulic rod 3 starts to work, because the upper end of the lifting hydraulic rod 3 is fixedly installed with a receiving plate 4, and the receiving plate 4 starts to move downward at this time, and the belt constituting the pulley group 23 starts to loosen. At the same time, the second electric telescopic rod 35 starts to work, because the second electric telescopic rod 35 is fixedly installed with an adding plate 36, and the adding plate 36 is rotatably installed with a push pulley 37, and the push pulley 37 starts to be pushed at this time, so that the push pulley 37 is always in contact with the belt constituting the pulley group 23, and supports the belt so that the belt is always in a straight state, ensuring the transmission effect of the pulley group 23, and the vehicle-mounted camera can now shoot the calibration plate 34, thereby achieving the purpose of calibrating the vehicle-mounted camera.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle-mounted camera assembly calibration device, comprising a workbench (1), a fixing plate (2) being fixedly mounted at the rear end of the upper surface of the workbench, and two supporting bases (38) being symmetrically arranged at the lower end of the workbench (1), characterized in that: Also includes: A motor (5) is fixedly arranged on the rear side of the fixed plate (2), and a first bevel gear (6) is mounted on the output end shaft of the motor (5), and a second bevel gear (7) is meshedly arranged on the side of the first bevel gear (6), an adjusting screw (8) is mounted on the middle position shaft of the second bevel gear (7), and the adjusting screw (8) is rotatably connected to the workbench (1), a movable sleeve (9) is arranged outside the adjusting screw (8), and a driving plate (10) is fixedly mounted on the movable sleeve (9), a first electric telescopic rod (12) is fixedly mounted on the driving plate (10), and a movable rack (12) is fixedly mounted on the first electric telescopic rod (12). 13), and the movable rack (13) is meshed with a rotating plate (14), the rotating plate (14) is rotatably arranged on the driving plate (10), a fixed shaft (15) is fixedly mounted on the rotating plate (14), and a rotating connecting plate (16) is arranged outside the fixed shaft (15), a pressure sensor (19) is fixedly mounted on the rotating connecting plate (16), a positioning rod (20) is penetrated through the rotating connecting plate (16), and a connecting plate (21) is fixedly mounted on the upper end of the positioning rod (20), a pressing spring (22) is fixedly mounted on the lower end of the connecting plate (21), and the pressing spring (22) is fixedly mounted on the rotating connecting plate (16).

2. The vehicle-mounted camera assembly calibration device according to claim 1, characterized in that: Two lifting hydraulic rods (3) are symmetrically mounted on the left and right sides of the fixed plate (2), and a receiving plate (4) is fixedly mounted on the upper ends of the lifting hydraulic rods (3).

3. The vehicle-mounted camera assembly calibration device according to claim 1, characterized in that: The workbench (1) is provided with cylindrical grooves on both sides thereof, and a guide rod (11) is fixedly mounted on the driving plate (10). The outer surface of the guide rod (11) is arranged to be smooth, and the guide rod (11) is slidably connected to the workbench (1) via the cylindrical grooves provided on the workbench (1).

4. The vehicle-mounted camera assembly calibration device according to claim 2, characterized in that: The first bevel gear (6) is coaxially fixedly mounted with a pulley set (23), and the pulley set (23) is axially connected to a gear set (24), and the gear set (24) is composed of two mutually meshing gears, and both gears are rotatably mounted on the receiving plate (4).

5. The vehicle-mounted camera assembly calibration device according to claim 4, characterized in that: The gear set (24) is meshingly connected with a rotating baffle (25), the rotating baffle (25) being provided with a gear tooth structure, and two rotating baffles (25) are provided symmetrically about the center of the receiving plate (4), and the rotating baffles (25) and the receiving plate (4) are rotationally connected.

6. The vehicle-mounted camera assembly calibration device according to claim 5, characterized in that: The rotating baffle (25) is provided with a penetrating positioning hole, and a limiting rod (26) is fitted in the positioning hole provided on the rotating baffle (25), a pressing plate (27) is fixedly mounted on the upper end of the limiting rod (26), and a pushing spring (28) is fixedly mounted on the lower end of the pressing plate (27), and an assembling plate (29) is provided at the lower end of the pushing spring (28), and the assembling plate (29) is fixedly mounted on the receiving plate (4).

7. The vehicle-mounted camera assembly calibration device according to claim 6, characterized in that: A sliding guide rod (30) is fixedly mounted on the rotating baffle (25), a push spring (31) is fixedly mounted on the sliding guide rod (30), and the push spring (31) is fixedly mounted on a push plate (32). A sliding groove is formed on the push plate (32), and the push plate (32) is slidably connected to the sliding guide rod (30) via the sliding groove.

8. The vehicle-mounted camera assembly calibration device according to claim 7, characterized in that: A clamping rod (33) is fixedly mounted on the pushing plate (32), a calibration plate (34) is fitted on the clamping rod (33), and a pressing plate (27) is fixedly mounted at the rear side of the calibration plate (34).

9. The vehicle-mounted camera assembly calibration device according to claim 4, characterized in that: A second electric telescopic rod (35) is fixedly mounted on the upper end of the fixed plate (2), an adding plate (36) is fixedly mounted on the second electric telescopic rod (35), and a push pulley (37) is rotatably mounted on the adding plate (36), the push pulley (37) being in contact with a belt constituting the pulley group (23).

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