A manual mechanical clutch type electric cylinder structure

Abstract

The utility model discloses a kind of manual mechanical clutch type electric cylinder structures, including driving assembly and electric cylinder, driving assembly is used to drive electric cylinder to stretch out or retract;Further include: reciprocating transmission assembly: transmission assembly is used to realize the linkage or disengagement between driving assembly and electric cylinder;Operating member: it is set on transmission assembly;Glass bead bolt: to stop transmission assembly, avoid transmission assembly automatic reset;Wherein, operating operating member drives transmission assembly to move forward, to realize the disengagement of driving assembly and electric cylinder and then interrupt power transmission;Operating operating member drives transmission assembly to move reversely, realize the linkage between driving assembly and electric cylinder, and then realize the recovery of power transmission, in emergency or when needing, power can be safely, rapidly interrupted, and operating operating member drives transmission assembly to move reversely, and the linkage between driving assembly and electric cylinder can be immediately recovered to make electric cylinder recover normal electric work quickly.

Description

Technical Field

[0001] This utility model relates to the field of electric telescopic cylinder technology, and in particular to a manual mechanical clutch electric cylinder structure. Background Technology

[0002] In numerous industrial production and automation applications, electric telescopic cylinders, as key actuators for achieving linear motion, are widely used in various mechanical equipment to complete important tasks such as material handling, position adjustment, and force transmission. Traditional electric telescopic cylinder drive systems typically employ a single, fixed power transmission mode, meaning that the drive component and the electric cylinder maintain a rigid connection at all times, and power is continuously transmitted.

[0003] This traditional drive method has many limitations in practical applications. For example, during equipment operation, there are stages where the electric cylinder does not need to work continuously. Because the traditional drive system cannot effectively cut off power transmission, it will accelerate the wear of drive components and related transmission parts, shorten the service life of the equipment, and reduce the reliability of the equipment. Therefore, there is an urgent need for a manual mechanical clutch electric cylinder structure that can quickly and reliably cut off or resume power transmission as needed. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a manual mechanical clutch electric cylinder structure.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] This utility model provides a manual mechanical clutch type electric cylinder structure, including a drive assembly and an electric cylinder, wherein the drive assembly is used to drive the electric cylinder to extend or retract; it also includes:

[0007] Reciprocating motion transmission components: Transmission components are used to enable linkage or disengagement between the drive components and the electric cylinder;

[0008] Operating components: mounted on the transmission assembly;

[0009] Beaded bolts: used to stop transmission components and prevent them from automatically resetting.

[0010] Specifically, the operating component drives the transmission assembly to move forward, thereby disengaging the drive assembly and the electric cylinder and interrupting power transmission; the operating component also drives the transmission assembly to move in the reverse direction, achieving linkage between the drive assembly and the electric cylinder, thereby restoring power transmission.

[0011] Preferably, the mechanical clutch electric cylinder structure further includes a clutch assembly disposed in the drive assembly and / or the electric cylinder. The transmission assembly achieves linkage or disengagement between the drive assembly and the electric cylinder through engagement or disengagement with the clutch assembly. The output end of the drive motor is provided with a first transmission shaft. The clutch assembly includes a clutch key disposed on the first transmission shaft. The transmission assembly has a keyway that mates with the clutch key. When the clutch key is located in the keyway, the rotational power output by the drive assembly is transmitted to the electric cylinder. When the clutch key is disengaged from the keyway, the rotational power output by the drive assembly is not transmitted to the electric cylinder. This achieves precise control of the on / off state of power transmission from the drive assembly to the electric cylinder through a simple and reliable mechanical structure of engagement and disengagement of the key and the keyway.

[0012] Preferably, the transmission assembly includes a first synchronous pulley, which is located at the output end of the drive assembly via a first transmission shaft to drive the electric cylinder to work. This achieves efficient and smooth transmission of the power of the drive motor to the electric cylinder and provides a structural basis for further transmission via synchronous belt.

[0013] Preferably, the manual mechanical clutch electric cylinder structure also includes a housing, and the ball bolt is elastically disposed in the housing via an external elastic element. A first groove is provided on the housing to accommodate the ball bolt. The elastic movement direction of the ball bolt is perpendicular to the rotation direction of the first synchronous pulley, thereby realizing the reliable restriction of the axial displacement of the synchronous pulley by using a vertical mechanical block. At the same time, its elastic design allows the component to pass over the ball bolt to switch positions after a certain external force is applied.

[0014] Preferably, the electric cylinder structure further includes an elastic reset mechanism, which includes a first elastic element disposed between the first synchronous pulley and the housing. The first elastic element acts elastically on the first synchronous pulley, and the direction of action of the first elastic element is parallel to the axial direction of the electric cylinder. This realizes the tendency and power to automatically reset the transmission component after disengaging from the clutch, ensuring that the linkage state can be quickly and accurately restored.

[0015] Preferably, the electric cylinder includes a second drive shaft, and the transmission assembly also includes a second synchronous pulley mounted on the second drive shaft. The first synchronous pulley and the second synchronous pulley are connected by an external belt to rotate together, which realizes the transmission of power from the drive end to the execution end over a long distance and in the same proportion, providing flexibility in design layout and ensuring the synchronicity of the movement at both ends.

[0016] Preferably, the working end of the glass ball bolt protrudes from the inner wall of the housing to limit the displacement of the first and second synchronous pulleys along the axis of the electric cylinder, thereby directly and effectively locking the entire transmission assembly, ensuring the stability of the transmission assembly position during power transmission and preventing accidental disengagement.

[0017] Preferably, the first and second synchronous pulleys are provided with covers, and both the first and second synchronous pulleys are rotatably arranged relative to the covers. The covers are provided with grooves for accommodating the working end of the glass ball bolts. The covers are slidably arranged inside the housing, which realizes the integration of multiple transmission components into a single sliding module, simplifies the structure, facilitates assembly and maintenance, and at the same time provides clear positioning points for the glass ball bolts.

[0018] Preferably, the elastic reset mechanism further includes a second elastic element disposed between the cover and the housing, and both the first elastic element and the second elastic element act on the first synchronous wheel and the second synchronous wheel via the cover;

[0019] One end of the operating component is located on the housing, and the end of the operating component away from the housing extends out of the housing. When the end of the operating component protruding from the housing moves the transmission component forward past the glass ball bolt, the operating component is released, the drive component and the electric cylinder disengage, and the glass ball bolt stops the housing to prevent the transmission component from resetting. When the end of the operating component protruding from the housing moves the housing away from the glass ball bolt and continues to move forward, the operating component is released, and the elastic reset mechanism drives the housing to move in the opposite direction past the glass ball bolt under the action of elastic restoring force. The transmission component realizes the connection between the drive component and the electric cylinder, and achieves a more balanced and stable reset force through dual elastic elements. Moreover, the user can control the sliding of the entire transmission component module with a single operating component, so as to easily and intuitively complete the switching and locking of the clutch state.

[0020] Preferably, the electric cylinder structure further includes a first limiting member disposed on the first synchronous pulley and a second limiting member disposed on the housing. The first limiting member and the second limiting member approach and engage to achieve calibration and positioning of the transmission component, thereby realizing precise calibration and positioning of the linkage position of the transmission component, ensuring that the clutch key and keyway can be accurately aligned, and guaranteeing the reliability and transmission accuracy when the power is engaged.

[0021] The beneficial effects of this utility model are as follows: the drive component provides power to the electric cylinder to extend or retract it, and the operating component provides the user with a direct and convenient operating point. By operating this operating component to drive the transmission component to move forward, the power transmission from the drive component to the electric cylinder can be actively cut off, thereby enabling safe and rapid interruption of power in emergency situations or when needed. When the operating component is operated to drive the transmission component to move in the reverse direction, the linkage between the drive component and the electric cylinder can be immediately restored to quickly restore the electric cylinder to normal electric operation. At the same time, the glass ball bolt is used to reliably lock the transmission component after it reaches the predetermined position, effectively preventing accidental movement caused by vibration or external force. Ultimately, the entire electric cylinder system achieves controllable power transmission, convenient state switching, stable working position, and safe and reliable operation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the mechanical clutch electric cylinder structure of this utility model;

[0025] Figure 2 This is one of the partial schematic diagrams of the mechanical clutch electric cylinder structure of this utility model;

[0026] Figure 3 This is the second partial schematic diagram of the mechanical clutch electric cylinder structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure and position of the glass ball bolt of this utility model;

[0028] Figure 5 This is the third partial schematic diagram of the mechanical clutch electric cylinder structure of this utility model;

[0029] Figure 6 This is a planar exploded view of the mechanical clutch electric cylinder structure of this utility model.

[0030] The reference numerals in the figures include:

[0031] 1. Drive assembly; 2. Clutch assembly; 3. Electric cylinder; 4. Reducer; 5. Housing; 6. Cover; 7. First limiting element; 8. Second limiting element; 9. Operating element; 11. Drive motor; 12. Mechanical brake unit; 13. First drive shaft; 21. Clutch key; 22. Beaded bolt; 31. Second drive shaft; 32. Spherical bearing; 51. First groove; 61. First synchronous pulley; 611. First elastic element; 62. Second synchronous pulley; 621. Second elastic element. Detailed Implementation

[0032] Reference Figures 1 to 6 A manual mechanical clutch type electric cylinder structure includes a drive assembly 1 and an electric cylinder 3, wherein the drive assembly 1 is used to drive the electric cylinder 3 to extend or retract; and further includes:

[0033] Reciprocating motion transmission component: The transmission component is used to realize the linkage or disengagement between the drive component 1 and the electric cylinder 3;

[0034] Operating component 9: Located on the transmission assembly;

[0035] 22-bead bolt: Used to stop the transmission components and prevent them from automatically resetting.

[0036] Specifically, the operating component 9 drives the transmission component to move forward, thereby disengaging the drive component 1 and the electric cylinder 3 and interrupting the power transmission; the operating component 9 drives the transmission component to move in the reverse direction past the glass ball bolt 22, thereby achieving linkage between the drive component 1 and the electric cylinder 3 and restoring the power transmission.

[0037] The drive assembly 1 provides power to the electric cylinder 3 to extend or retract it. The operating component 9 provides the user with a direct and convenient operating point. By operating this operating component 9 to drive the transmission assembly to move forward, the power transmission from the drive assembly 1 to the electric cylinder 3 can be actively cut off, thereby enabling a safe and rapid interruption of power in emergencies or when needed. Conversely, by operating the operating component 9 to drive the transmission assembly to move in the reverse direction, the linkage between the drive assembly 1 and the electric cylinder 3 can be immediately restored, allowing the electric cylinder 3 to quickly resume normal electric operation. At the same time, the glass ball bolt 22 is used to reliably lock the transmission assembly after it reaches the predetermined position, effectively preventing accidental movement caused by vibration or external force. Ultimately, this together achieves controllable power transmission, convenient state switching, stable working position, and safe and reliable operation of the entire electric cylinder system.

[0038] Specifically, the drive assembly 1 includes a drive motor 11 with a braking function, namely a mechanical brake unit 12 disposed on the drive motor 11, and the drive motor 11 is used to output rotational power.

[0039] Specifically, the electric cylinder 3 is provided with joint bearings 32 at both ends along its length.

[0040] Specifically, the mechanical principle by which the electric cylinder 3 achieves extension and retraction is a well-known technology in this field, and will not be elaborated upon here.

[0041] Specifically, the output end of the drive assembly 1 is equipped with a reducer 4, which is a planetary gear reducer 4, including a sun gear, planet gears, a planet carrier, and an internal gear ring. The sun gear is connected to the output shaft of the drive motor 11, and the planet gears are mounted on the planet carrier and mesh with the sun gear and the internal gear ring. The planet carrier, as the output component of the reducer 4, is equipped with a first transmission shaft 13. This achieves the effect of reducing the output speed of the drive motor 11 and increasing the torque through the planetary gear reducer 4, thereby making the power output of the drive assembly 1 more suitable for subsequent transmission and working requirements, and improving transmission stability and efficiency.

[0042] Specifically, the mechanical clutch electric cylinder structure also includes a clutch assembly 2 disposed in the drive assembly 1 and / or the electric cylinder 3. The transmission assembly achieves linkage or disengagement between the drive assembly 1 and the electric cylinder 3 through engagement or disengagement with the clutch assembly 2. The output end of the drive motor 11 is provided with a first transmission shaft 13. The clutch assembly 2 includes a clutch key 21, which is disposed on the first transmission shaft 13. The transmission assembly has a keyway that mates with the clutch key 21. The transmission assembly and the first transmission shaft 13 are slidably connected through the engagement of the key 21 and the keyway. When the clutch key 21 is located in the keyway, the rotational power output by the drive assembly 1 is transmitted to the electric cylinder 3. When the clutch key 21 is disengaged from the keyway, the rotational power output by the drive assembly 1 is not transmitted to the electric cylinder 3. This achieves precise control of the on / off state of power transmission from the drive assembly 1 to the electric cylinder 3 through the simple and reliable mechanical structure of engagement and disengagement of the key and the keyway.

[0043] Specifically, the sliding connection at the front end refers to the ability of the transmission component to slide off the first transmission shaft 13.

[0044] Specifically, the transmission assembly includes a first synchronous pulley 61, which is located at the output end of the drive assembly 1 via a first transmission shaft 13 to drive the electric cylinder 3 to work. This realizes the efficient and smooth transmission of the power of the drive motor 11 to the electric cylinder 3, and provides a structural basis for further transmission via synchronous belt.

[0045] Specifically, the manual mechanical clutch electric cylinder structure also includes a housing 5. The ball bolt 22 is elastically mounted on the housing 5 via an external elastic element. A first groove 51 is provided on the housing 5 to accommodate the ball bolt 22. The elastic movement direction of the ball bolt 22 is perpendicular to the rotation direction of the first synchronous pulley 61, which realizes the reliable restriction of the axial displacement of the synchronous pulley by using a vertical mechanical block. At the same time, its elastic design allows the component to pass over the ball bolt 22 to switch positions after a certain external force is applied.

[0046] Specifically, the electric cylinder structure also includes an elastic reset mechanism, which includes a first elastic element 611 located between the first synchronous pulley 61 and the housing 5. The first elastic element 611 acts elastically on the first synchronous pulley 61, and the direction of action of the first elastic element 611 is parallel to the axial direction of the electric cylinder 3. This realizes the tendency and power to automatically reset the transmission component after disengaging from the clutch, ensuring that the linkage state can be quickly and accurately restored.

[0047] Specifically, the electric cylinder 3 includes a second drive shaft 31, and the transmission assembly also includes a second synchronous pulley 62 mounted on the second drive shaft 31. The first synchronous pulley 61 and the second synchronous pulley 62 are connected by an external belt to rotate together, thereby realizing the transmission of power from the drive end to the execution end over a long distance and in the same proportion, providing flexibility in design layout and ensuring the synchronicity of the movements at both ends.

[0048] Specifically, the transmission assembly includes a cover 6 and a first synchronous wheel 61 and a second synchronous wheel 62 rotatably disposed within the cover 6.

[0049] Specifically, the second synchronous pulley 62 is slidably disposed on the second transmission shaft 31 along the axial direction of the second transmission shaft 31, and the second synchronous pulley 62 and the second transmission shaft 31 may be provided with a sliding groove and a sliding protrusion, respectively.

[0050] Specifically, the working end of the glass ball bolt 22 protrudes from the inner wall of the housing 5 to limit the displacement of the first synchronous wheel 61 and the second synchronous wheel 62 along the axis of the electric cylinder 3, thereby directly and effectively locking the entire transmission assembly, ensuring the stability of the transmission assembly position during power transmission and preventing accidental disengagement.

[0051] Specifically, the glass ball bolt 22 is mounted on the housing 5 via an external spring, which is used to bring the glass ball bolt 22 close to the cover 6 described below when it is not subjected to external force.

[0052] Specifically, the first synchronous pulley 61 and the second synchronous pulley 62 are provided with a cover 6. The first synchronous pulley 61 and the second synchronous pulley 62 are rotatably arranged relative to the cover 6. The cover 6 is provided with a groove for accommodating the working end of the glass ball bolt 22. The cover 6 is slidably arranged inside the housing 5, realizing the integration of multiple transmission components into a module that can slide as a whole, simplifying the structure and facilitating assembly and maintenance. At the same time, the groove provides a clear positioning point for the glass ball bolt 22.

[0053] Specifically, the elastic reset mechanism also includes a second elastic element 621 disposed between the cover 6 and the housing 5. The first elastic element 611 and the second elastic element 621 both act on the first synchronous pulley 61 and the second synchronous pulley 62 via the cover 6.

[0054] One end of the operating component 9 is located on the cover 6, and the other end of the operating component 9, away from the cover 6, extends out of the housing 5. When the end of the operating component 9 protruding from the housing 5 is operated to move the transmission component forward past the glass ball bolt 22, the operating component 9 is released, the drive component 1 and the electric cylinder 3 disengage, and the glass ball bolt 22 stops the cover 6 to prevent the transmission component from resetting. When the end of the operating component 9 protruding from the housing 5 is operated to move the cover 6 away from the glass ball bolt 22 and continue to move forward, the operating component 9 is released, and the elastic reset mechanism drives the cover 6 to move in the opposite direction past the glass ball bolt 22 under the action of elastic restoring force. The transmission component realizes the connection between the drive component 1 and the electric cylinder 3, and realizes a more balanced and stable reset force through the dual elastic components. Moreover, the user can control the sliding of the entire transmission component module through a single operating component 9, so as to easily and intuitively complete the switching and locking of the clutch state.

[0055] Specifically, the protruding end of the operating component 9 has three rings of different colors: green (engaged position), yellow (clutch locking position), and red (reset pull position). An observation window is provided at the corresponding position on the housing 5. When the system is normally engaged, the operating component 9 is at its innermost position, and the green ring is visible. When the system malfunctions and the housing 6 moves, the operating component 9 moves accordingly, and the yellow ring aligns with the observation window. When the operating component 9 is manually pulled to perform a reset operation, the red ring aligns with the observation window, and the reset operation can then be performed.

[0056] Specifically, the spring force is ≥ 1.5 times the maximum static friction force of the glass bead.

[0057] Specifically, the electric cylinder structure also includes a first limiting member 7 on the first synchronous pulley 61 and a second limiting member 8 on the housing 5. The first limiting member 7 and the second limiting member 8 move closer together to achieve calibration and positioning of the transmission component, realizing precise calibration and positioning of the linkage position of the transmission component, ensuring that the clutch key 21 and the keyway can be accurately aligned, and ensuring the reliability and transmission accuracy when the power is engaged.

[0058] Specifically, the first limiting member 7 has a first ring body and a first locking tooth disposed on the first ring body, and the second limiting member 8 has a second ring body and a plurality of second locking teeth disposed on the second ring body. The locking teeth are triangular, and the width of the locking tooth at the end away from the ring body is smaller than the width of the locking tooth at the end close to the ring body. The first locking tooth is used to engage and insert between two adjacent second locking teeth.

[0059] Specifically, the first limiting member 7 is rotatably disposed relative to the cover 6, and the second limiting member 8 is rotatably disposed on the housing 5 so that the first limiting member 7 can be rotated via the second limiting member 8 when needed.

[0060] The above description provides one or more embodiments in conjunction with specific content, but it is not intended that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A manual mechanical clutch type electric cylinder structure, comprising a drive assembly (1) and an electric cylinder (3), wherein the drive assembly (1) is used to drive the electric cylinder (3) to extend or retract; characterized in that, Also includes: Reciprocating motion transmission component: The transmission component is used to realize the linkage or disengagement between the drive component (1) and the electric cylinder (3); Operating component (9): Set on the transmission assembly; Glass ball bolt (22): Used to stop the transmission assembly and prevent the transmission assembly from automatically resetting; The operation of the operating component (9) drives the transmission component to move forward, thereby disengaging the drive component (1) and the electric cylinder (3) and interrupting the power transmission; the operation of the operating component (9) drives the transmission component to move in the opposite direction past the glass ball bolt (22), thereby realizing the linkage between the drive component (1) and the electric cylinder (3) and thus restoring the power transmission.

2. The manual mechanical clutch electric cylinder structure according to claim 1, characterized in that: The mechanical clutch electric cylinder structure also includes a clutch assembly (2) disposed on the drive assembly (1) and / or the electric cylinder (3), and the transmission assembly realizes the linkage or disengagement between the drive assembly (1) and the electric cylinder (3) by engaging or disengaging with the clutch assembly (2); The output end of the drive motor (11) is provided with a first transmission shaft (13). The clutch assembly (2) includes a clutch key (21). The clutch key (21) is located on the first transmission shaft (13). The transmission assembly has a keyway that cooperates with the clutch key (21). The transmission assembly and the first transmission shaft (13) are slidably connected through the cooperation of the key (21) and the keyway. When the clutch key (21) is in the keyway, the rotational power output by the drive assembly (1) is transmitted to the electric cylinder (3); when the clutch key (21) is removed from the keyway, the rotational power output by the drive assembly (1) is not transmitted to the electric cylinder (3).

3. The manual mechanical clutch electric cylinder structure according to claim 2, characterized in that: The transmission assembly includes a first synchronous pulley (61), which is located at the output end of the drive assembly (1) via a first transmission shaft (13) to drive the electric cylinder (3) to work.

4. The manual mechanical clutch electric cylinder structure according to claim 3, characterized in that: The manual mechanical clutch electric cylinder structure also includes a housing (5), and the ball bolt (22) is elastically disposed on the housing (5) via an external elastic element. A first groove (51) is provided on the housing (5) for accommodating the ball bolt (22).

5. The manual mechanical clutch electric cylinder structure according to claim 4, characterized in that: The electric cylinder structure also includes an elastic reset mechanism, which includes a first elastic element (611) disposed between the first synchronous pulley (61) and the housing (5). The first elastic element (611) acts elastically on the first synchronous pulley (61), and the direction of action of the first elastic element (611) is parallel to the axial direction of the electric cylinder (3).

6. The manual mechanical clutch type electric cylinder structure according to claim 5, characterized in that: The electric cylinder (3) includes a second drive shaft (31), and the transmission assembly also includes a second synchronous pulley (62) disposed on the second drive shaft (31). The first synchronous pulley (61) and the second synchronous pulley (62) are connected by an external belt to rotate together.

7. The manual mechanical clutch type electric cylinder structure according to claim 6, characterized in that: The working end of the glass ball bolt (22) protrudes from the inner wall of the housing (5) to limit the displacement of the first synchronous pulley (61) and the second synchronous pulley (62) along the axis of the electric cylinder (3).

8. The manual mechanical clutch electric cylinder structure according to claim 6, characterized in that: The first synchronous pulley (61) and the second synchronous pulley (62) are provided with a cover (6). The first synchronous pulley (61) and the second synchronous pulley (62) are rotatably arranged relative to the cover (6). The cover (6) is provided with a groove for accommodating the working end of the glass ball bolt (22). The cover (6) is slidably arranged inside the housing (5).

9. The manual mechanical clutch type electric cylinder structure according to claim 8, characterized in that: The elastic reset mechanism also includes a second elastic element (621) disposed between the cover (6) and the housing (5). The first elastic element (611) and the second elastic element (621) both act on the first synchronous pulley (61) and the second synchronous pulley (62) via the cover (6). One end of the operating component (9) is located on the cover (6), and the end of the operating component (9) away from the cover (6) extends out of the housing (5). When the end of the operating component (9) protruding out of the housing (5) is operated to make the transmission component move forward past the glass ball bolt (22), the operating component (9) is released, the drive component (1) and the electric cylinder (3) are disengaged, and the glass ball bolt (22) stops the cover (6) to prevent the transmission component from resetting. When the end of the operating component (9) protruding out of the housing (5) is operated to make the cover (6) move forward away from the glass ball bolt (22), the operating component (9) is released, and the elastic reset mechanism drives the cover (6) to move in the opposite direction past the glass ball bolt (22) under the action of elastic restoring force. The transmission component realizes the connection between the drive component (1) and the electric cylinder (3).

10. A manual mechanical clutch electric cylinder structure according to any one of claims 4-9, characterized in that: The electric cylinder structure also includes a first limiting member (7) on the first synchronous pulley (61) and a second limiting member (8) on the housing (5). The first limiting member (7) and the second limiting member (8) are engaged to achieve calibration and positioning of the transmission component.

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