A chain over-torque protection device

Abstract

The utility model discloses a chain over-torque protection device, including a transmission shaft, an input pulley, and a torque limiter. The input pulley is sleeved on the outer peripheral side of the transmission shaft, and a rotating bearing is provided between the input pulley and the transmission shaft; the torque limiter is fixedly sleeved on the outer peripheral side of the transmission shaft, and the torque limiter is connected to one end of the input pulley. The utility model adds a rotating bearing between the input pulley and the transmission shaft, and the input pulley realizes rotational cooperation with the transmission shaft through the rotating bearing, which solves the suspended state of the input pulley, makes the input pulley have a reliable supporting function, ensures the coaxiality of the input pulley, the transmission shaft and the torque limiter, solves the impact of the input pulley's jumping on the torque limiter, and ensures that when the torque exceeds the set value, the torque limiter can smoothly rotate and slip, which plays a protective role while reducing the damage of the torque limiter.

Description

Technical Field

[0001] The utility model relates to the field of synchronous stretching machine chain drive of a mechanical synchronous biaxial stretching film production line, in particular to a chain over-torque protection device. Background Art

[0002] In the mechanical synchronous biaxial stretching film production line, the synchronous stretching machine is the core and most critical part of the production line. The plastic sheet is biaxially stretched into a film in the synchronous stretching machine. The most critical part of the synchronous biaxial stretching machine is the chain and chain clamp system. The chain runs in a track with a specific curve, driving the chain clamp to realize the film heating, biaxial stretching, shaping and other film making processes. The entire chain system is very complex, expensive, difficult to repair, and extremely prone to failures such as jamming. If the chain is not protected from over-torque, it will cause serious damage to the chain, chain clamp, chain track and other components when a failure occurs, causing significant losses. Therefore, it is necessary to add a set of mechanical over-torque protection devices to the chain drive to achieve timely disconnection of the drive system when the chain fails, and stop the motor drive at the same time, so as to protect the chain and motor and other equipment.

[0003] At present, a torque limiter is generally set to protect the chain. One side of the current input pulley is connected to the transmission shaft through the torque limiter, in which the force borne by the input pulley is all transmitted to the torque limiter, and the input pulley is in a suspended state. It will jump during the rotation process, resulting in misalignment with the transmission shaft and the torque limiter. The final result is that the internal transmission teeth of the torque limiter are unevenly stressed, damaged quickly, and have a short life. Utility Model Content

[0004] The utility model aims to provide a chain over-torque protection device to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] The utility model provides a chain over-torque protection device, comprising:

[0007] transmission shaft;

[0008] An input pulley is sleeved on the outer circumference of the transmission shaft, and a rotating bearing is provided between the input pulley and the transmission shaft;

[0009] The torque limiter is fixedly sleeved on the outer peripheral side of the transmission shaft, and the torque limiter is connected to one end of the input pulley.

[0010] The beneficial effects of the utility model are:

[0011] When in use, the input pulley is connected to the transmission shaft through the torque limiter to drive the transmission shaft to rotate. When overload occurs, the torque limiter disconnects the connection between the input pulley and the transmission shaft, and the input torque of the input pulley will not be transmitted to the transmission shaft. The utility model adds a rotating bearing between the input pulley and the transmission shaft. The input pulley realizes rotational cooperation with the transmission shaft through the rotating bearing, which solves the suspended state of the input pulley, provides the input pulley with reliable support, ensures the coaxiality of the input pulley, the transmission shaft and the torque limiter, solves the impact of the input pulley's bounce on the torque limiter, and ensures that when the torque exceeds the set value, the torque limiter can rotate and slip smoothly, which plays a protective role while reducing the damage of the torque limiter.

[0012] As a further improvement of the above technical solution, the rotating bearing is arranged at an end of the input pulley facing away from the torque limiter.

[0013] When installing the rotating bearing, the rotating bearing can be installed without changing the relative positions between the original input pulley, the torque limiter and the transmission shaft, and when maintaining the rotating bearing, the torque limiter does not need to be disassembled.

[0014] As a further improvement of the above technical solution, the end face of the input pulley facing away from the torque limiter is provided with an annular mounting groove, the rotating bearing is sleeved in the mounting groove, the transmission shaft is sleeved with a limiting sleeve, and the limiting sleeve abuts against the outer end of the rotating bearing.

[0015] The rotating bearing of the present invention is installed in the mounting groove to achieve fixed installation with the input pulley, and the outer end of the rotating bearing is limited by the limiting sleeve. When the mounting groove and the limiting sleeve are clamped together, the rotating bearing is fixed in the axial direction.

[0016] As a further improvement of the above technical solution, the torque limiter includes a connecting sleeve, a sleeve, a transmission sleeve and an elastic component. The sleeve is fixedly sleeved on the outer periphery of the transmission shaft. The connecting sleeve and the transmission sleeve are arranged side by side in the axial direction. The transmission sleeve is relatively fixedly arranged relative to the sleeve in the circumferential direction and relatively slidably arranged in the axial direction. The connecting sleeve is fixedly connected to the input pulley. A clutch card structure is provided between the connecting sleeve and the transmission sleeve. The elastic component provides an axial elastic force to the transmission sleeve, so that the transmission sleeve and the connecting sleeve are clutch-engaged in the axial direction to realize torque transmission in the circumferential direction.

[0017] The torque limiter of the present scheme realizes the transmission and separation of torque between the transmission shaft and the input pulley. Under normal conditions, the elastic force provided by the elastic component makes the transmission sleeve axially engage and engage with the connecting sleeve through the clutch engaging structure to realize the circumferential torque transmission between the transmission sleeve and the connecting sleeve. At this time, the input pulley drives the transmission sleeve to rotate through the connecting sleeve, and the transmission sleeve drives the transmission shaft to rotate through the sleeve; when the required torque exceeds the set value due to overload or mechanical failure, the connecting sleeve drives the transmission sleeve to move axially through the clutch engaging structure, the elastic component is compressed, and the connecting sleeve and the transmission sleeve rotate relative to each other, thereby realizing the transmission disconnection between the connecting sleeve and the transmission sleeve, wherein the required torque is the torque to be output by the transmission shaft.

[0018] As a further improvement of the above technical solution, the clutch engaging structure includes a clutch engaging slot and a clutch engaging block that are matched and engaged with each other. The clutch engaging slot and the clutch engaging block are respectively arranged on the end surfaces facing the transmission sleeve and the connecting sleeve. In the radial direction, the clutch engaging slot is an arc-shaped groove structure.

[0019] In this solution, the transmission connection between the transmission sleeve and the connecting sleeve is achieved by engaging the clutch card block with the clutch card slot. When the required torque exceeds the set value, the clutch card block is disengaged from the clutch card slot to disconnect the torque limiter.

[0020] As a further improvement of the above technical solution, a first gear ring is provided on the outer periphery of the sleeve, and a second gear ring meshing with the first gear ring is provided on the inner periphery of the transmission sleeve.

[0021] The transmission sleeve of the present solution meshes with the second gear ring on the outer periphery of the sleeve through the first gear ring to achieve torque transmission between the transmission sleeve and the sleeve, and to achieve relative sliding between the transmission sleeve and the sleeve in the axial direction.

[0022] As a further improvement of the above technical solution, a limiting ring is sleeved on the outer periphery of the sleeve, a limiting step is provided on the inner periphery of the transmission sleeve, and the elastic component is arranged between the limiting ring and the limiting step.

[0023] The transmission sleeve in this solution abuts against the elastic component via a limiting step, and the sleeve abuts against the elastic component via a limiting ring, so as to achieve limiting installation of the elastic component, so that the elastic force of the elastic component acts on the transmission sleeve along the axial direction.

[0024] As a further improvement of the above technical solution, an installation step is provided on the outer periphery of the sleeve, and a sleeve convex ring is provided on the inner periphery of the connecting sleeve, and the sleeve convex ring is movably sleeved between the installation step and the transmission sleeve.

[0025] The connecting sleeve of the present invention is sleeved on the outer circumference of the sleeve by means of a sleeve convex ring, and is limitedly installed by means of the sleeve convex ring and the transmission sleeve, so that the connecting sleeve can move axially and circumferentially up and down the outer circumference of the sleeve.

[0026] As a further improvement of the above technical solution, the input pulley is evenly distributed with a plurality of connecting screws in an annular shape, and the connecting screws pass through the input pulley in the axial direction and are connected to the torque limiter.

[0027] The input pulley of the present invention is connected to the torque limiter through a plurality of connecting screws, so the installation is convenient and stable.

[0028] As a further improvement of the above technical solution, the transmission shaft is provided with an output pulley and at least two bearing seats, and the input pulley and the torque limiter are arranged between two adjacent bearing seats.

[0029] When in use, the bearing seat is used to install and support the transmission shaft, and the two input pulleys and the torque limiter are located between the two bearing seats, which can improve the stability of the support for the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0031] Figure 1 This is a partial cross-sectional view of an embodiment of the chain over-torque protection device provided by the utility model;

[0032] Figure 2 The torque limiter provided by the utility model is a decomposition of an embodiment of the invention. Figure 1 ;

[0033] Figure 3 The torque limiter provided by the utility model is a decomposition of an embodiment of the invention. Figure 2 ;

[0034] Figure 4 The utility model is a schematic diagram of a chain over-torque protection device provided by the utility model, and an embodiment thereof. DETAILED DESCRIPTION

[0035] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0036] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present utility model, if there are words such as "several", it means one or more, "more" means more than two, greater than, less than, exceed, etc. are understood to exclude the number, and above, below, within, etc. are understood to include the number.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] Reference Figure 1 to Figure 4 The chain over-torque protection device of the utility model is implemented as follows:

[0040] like Figure 1 As shown, the chain over-torque protection device of the embodiment of the utility model includes a transmission shaft 100 , an input pulley 200 and a torque limiter 300 .

[0041] In order to facilitate the detailed description of the relative relationship between other components, this embodiment takes the transmission shaft 100 extending left and right as an example. In other embodiments, the transmission shaft 100 may be extended in other directions.

[0042] The input pulley 200 is mounted on the outer peripheral side of the transmission shaft 100, and the input pulley 200 and the transmission shaft 100 are arranged to rotate relative to each other. In this embodiment, a rotating bearing 400 is arranged between the inner periphery of the input pulley 200 and the outer periphery of the transmission shaft 100, and the input pulley 200 is rotated together with the transmission shaft 100 through the rotating bearing 400.

[0043] The torque limiter 300 is fixedly mounted on the outer peripheral side of the transmission shaft 100. The transmission shaft 100 and the torque limiter 300 are relatively fixedly arranged, and the torque limiter 300 is connected to the left end of the input pulley 200. When in use, the input pulley 200 is connected to the transmission shaft 100 through the torque limiter 300 to drive the transmission shaft 100 to rotate.

[0044] It can be understood that the power input end of the torque limiter 300 is connected to the input pulley 200, and the power output end of the torque limiter 300 is connected to the transmission shaft 100. The torque limiter 300 mainly realizes that when an overload occurs, the torque limiter 300 disconnects the transmission connection between the input pulley 200 and the transmission shaft 100, and the input torque of the input pulley 200 will not be transmitted to the transmission shaft 100.

[0045] The utility model adds a rotating bearing 400 between the input pulley 200 and the transmission shaft 100. The input pulley 200 realizes rotational cooperation with the transmission shaft 100 through the rotating bearing 400, thereby solving the suspended state of the input pulley 200, providing the input pulley 200 with a reliable supporting effect, ensuring the coaxiality of the input pulley 200, the transmission shaft 100 and the torque limiter 300, solving the impact of the jumping of the input pulley 200 on the torque limiter 300, and ensuring that when the torque exceeds the set value, the torque limiter 300 can rotate and slip smoothly, thereby playing a protective role and reducing the damage of the torque limiter 300.

[0046] like Figure 1 As shown, the rotating bearing 400 is arranged in the right end of the input pulley 200. When installing the rotating bearing 400, the rotating bearing 400 can be installed without changing the relative positions between the original input pulley 200, the torque limiter 300 and the transmission shaft 100, and when maintaining the rotating bearing 400, there is no need to remove the torque limiter 300.

[0047] Specifically, in this embodiment, an annular mounting groove 210 is provided at the right end of the input pulley 200, and the rotating bearing 400 is mounted in the mounting groove 210, wherein the outer periphery of the rotating bearing 400 is interference fit with the mounting groove 210, and the inner periphery of the rotating bearing 400 is interference fit with the transmission shaft 100. It can be understood that the mounting groove 210 is opened on the original input pulley 200, and then the rotating bearing 400 is embedded in the mounting groove 210.

[0048] The outer periphery of the transmission shaft 100 of this embodiment is sleeved with a limiting sleeve 110, and the limiting sleeve 110 abuts against the right end face of the rotating bearing 400. The rotating bearing 400 is sleeved in the mounting groove 210 to achieve fixed installation with the input pulley 200. At the same time, the outer end of the rotating bearing 400 is limited by the limiting sleeve 110. When the mounting groove 210 and the limiting sleeve 110 are clamped together, the rotating bearing 400 is fixed in the axial direction.

[0049] In this embodiment, a bearing retaining ring 120 is further provided between the limiting sleeve 110 and the rotating bearing 400. When in use, the rotating bearing 400 is limited in advance by the bearing retaining ring 120 and then locked by the limiting sleeve 110. The limiting sleeve 110 of this embodiment adopts a nut structure, and an external thread that cooperates with the thread of the limiting sleeve 110 is provided on the outer periphery of the transmission shaft 100.

[0050] like Figures 1 to 3 As shown, the torque limiter 300 includes a connecting sleeve 310, a sleeve 320, a transmission sleeve 330 and an elastic component 340. The sleeve 320 is fixedly sleeved on the outer periphery of the transmission shaft 100, and the sleeve 320 and the transmission shaft 100 are connected by a key.

[0051] The transmission sleeve 330 and the connecting sleeve 310 are axially arranged side by side from left to right on the outer peripheral side of the sleeve 320. The transmission sleeve 330 is relatively fixedly arranged relative to the sleeve 320 in the circumferential direction and relatively slidably arranged in the axial direction. The connecting sleeve 310 is fixedly connected to the left end of the input pulley 200. A clutch card structure is provided between the connecting sleeve 310 and the transmission sleeve 330. The elastic component 340 is used to provide axial elastic force to the transmission sleeve 330, so that the transmission sleeve 330 and the connecting sleeve 310 are clutched and engaged in the axial direction to realize torque transmission in the circumferential direction.

[0052] The torque limiter 300 realizes the transmission and separation of the torque between the transmission shaft 100 and the input pulley 200. Under normal conditions, the elastic force provided by the elastic component 340 makes the transmission sleeve 330 clutch and engage with the connecting sleeve 310 in the axial direction through the clutch engaging structure to realize the circumferential torque transmission between the transmission sleeve 330 and the connecting sleeve 310. At this time, the input pulley 200 drives the transmission sleeve 330 to rotate through the connecting sleeve 310, and the transmission sleeve 330 drives the transmission shaft 100 to rotate through the sleeve 320; when the required torque exceeds the set value due to overload or mechanical failure, the connecting sleeve 310 drives the transmission sleeve 330 to move axially through the clutch engaging structure, the elastic component 340 is compressed, and the connecting sleeve 310 and the transmission sleeve 330 rotate relative to each other, thereby realizing the transmission disconnection between the connecting sleeve 310 and the transmission sleeve 330, wherein the required torque is the torque to be output by the transmission shaft 100.

[0053] Furthermore, the clutch card connection structure of the present embodiment includes a clutch card slot 350 and a clutch card block 360, and the clutch card slot 350 and the clutch card block 360 are respectively arranged on the end surfaces facing the transmission sleeve 330 and the connecting sleeve 310. Specifically, the clutch card slot 350 of the present embodiment is arranged on the right end surface of the transmission sleeve 330, and the clutch card block 360 is arranged on the left end surface of the connecting sleeve 310. In the radial direction, the clutch card slot 350 is an arc-shaped groove structure, and the clutch card slot 350 and the clutch card block 360 are matched and connected. In the present embodiment, the transmission connection between the transmission sleeve 330 and the connecting sleeve 310 is realized by the connection between the clutch card block 360 and the clutch card slot 350. When the required torque exceeds the set value, the clutch card block 360 is disengaged from the clutch card slot 350 to realize the disconnection of the torque limiter 300.

[0054] There are multiple clutch slots 350 and multiple clutch blocks 360 , and the multiple clutch slots 350 are arranged in a ring-shaped manner. The multiple clutch blocks 360 are arranged in a one-to-one correspondence with the multiple clutch slots 350 , which can improve the transmission torque.

[0055] In this embodiment, a first toothed ring 321 is provided on the outer periphery of the sleeve 320, and a second toothed ring 331 meshing with the first toothed ring 321 is provided on the inner periphery of the transmission sleeve 330. The transmission sleeve 330 meshes with the second toothed ring 331 on the outer periphery of the sleeve 320 through the first toothed ring 321 to realize torque transmission between the transmission sleeve 330 and the sleeve 320, and realize relative sliding between the transmission sleeve 330 and the sleeve 320 in the axial direction.

[0056] A limiting ring 370 is sleeved on the outer periphery of the sleeve 320, and the limiting ring 370 is sleeved on the left end of the sleeve 320. A limiting step 332 is provided on the inner periphery of the transmission sleeve 330, and the limiting step 332 is arranged at the right end of the transmission sleeve 330. The elastic component 340 is arranged between the limiting ring 370 and the limiting step 332. The transmission sleeve 330 abuts against the right end of the elastic component 340 through the limiting step 332, and the sleeve 320 abuts against the left end of the elastic component 340 through the limiting ring 370 to realize the limiting installation of the elastic component 340, so that the elastic force of the elastic component 340 acts on the transmission sleeve 330 along the axial direction.

[0057] The limiting ring 370 adopts a nut structure.

[0058] The elastic component 340 of this embodiment includes a plurality of elastic disc springs 341 arranged in sequence on the left and right sides. The elastic disc springs 341 are sleeved on the outer circumference of the sleeve 320. In other embodiments, a spring structure may be used.

[0059] The outer periphery of the sleeve 320 of this embodiment is provided with an installation step 322, which is annular and arranged at the right end of the sleeve 320. The inner periphery of the connecting sleeve 310 is provided with a sleeve convex ring 311, which is movably sleeved between the installation step 322 and the transmission sleeve 330.

[0060] The connecting sleeve 310 is sleeved on the outer circumference of the sleeve 320 through the sleeve convex ring 311, and is limitedly installed by the sleeve convex ring 311 and the transmission sleeve 330, so that the connecting sleeve 310 can move up and down the outer circumference of the sleeve 320 in the axial direction and around the circumference.

[0061] In addition, the input pulley 200 is evenly distributed with multiple connecting screws 220 in a ring shape. The connecting screws 220 pass through the input pulley 200 axially and are connected to the connecting sleeve 310. The input pulley 200 is connected to the torque limiter 300 through multiple connecting screws 220, which is convenient and stable to install.

[0062] like Figure 4 As shown, the transmission shaft 100 is provided with an output pulley 500 and at least two bearing seats 600, and the input pulley 200 and the torque limiter 300 are arranged between two adjacent bearing seats 600. When in use, the bearing seats 600 are used to install and support the transmission shaft 100, and the two input pulleys 200 and the torque limiter 300 are located between the two bearing seats 600, which can improve the stability of the support for the transmission shaft 100 and output the torque outward through the output pulley 500.

[0063] The utility model adds a rotating bearing 400 between the input pulley 200 and the transmission shaft 100, which ensures the coaxiality of the input pulley 200, the transmission shaft 100 and the torque limiter 300, solves the jumping problem of the input pulley 200 in the original over-torque protection device due to being in a suspended state, makes the torque limiter 300 evenly stressed, greatly reduces the impact force, and greatly reduces the wear. The actual use verification shows that the service life of the optimized torque limiter 300 is extended, the impact and wear of the internal parts of the torque limiter 300 are reduced, and the optimization effect is achieved.

[0064] The preferred implementation modes of the present invention are specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A chain over-torque protection device, characterized in that: include: Transmission shaft (100); An input pulley (200) is sleeved on the outer circumference of the transmission shaft (100), and a rotating bearing (400) is provided between the input pulley (200) and the transmission shaft (100); The torque limiter (300) is fixedly mounted on the outer peripheral side of the transmission shaft (100), and the torque limiter (300) is connected to one end of the input pulley (200).

2. The chain over-torque protection device according to claim 1, characterized in that: The rotary bearing (400) is arranged at one end of the input pulley (200) facing away from the torque limiter (300).

3. The chain over-torque protection device according to claim 2, characterized in that: An annular mounting groove (210) is provided on the end surface of the input pulley (200) facing away from the torque limiter (300), the rotary bearing (400) is sleeved in the mounting groove (210), the transmission shaft (100) is sleeved with a limiting sleeve (110), and the limiting sleeve (110) abuts against the outer end of the rotary bearing (400).

4. The chain over-torque protection device according to claim 1, characterized in that: The torque limiter (300) comprises a connecting sleeve (310), a sleeve (320), a transmission sleeve (330) and an elastic component (340); the sleeve (320) is fixedly sleeved on the outer circumference of the transmission shaft (100); the connecting sleeve (310) and the transmission sleeve (330) are arranged side by side in the axial direction; the transmission sleeve (330) is relatively fixedly arranged in the circumferential direction and relatively slidably arranged in the axial direction relative to the sleeve (320); the connecting sleeve (310) is fixedly connected to the input pulley (200); a clutch engaging structure is provided between the connecting sleeve (310) and the transmission sleeve (330); the elastic component (340) provides an axial elastic force to the transmission sleeve (330), so that the transmission sleeve (330) and the connecting sleeve (310) are clutch-engaged in the axial direction to achieve torque transmission in the circumferential direction.

5. The chain over-torque protection device according to claim 4, characterized in that: The clutch engaging structure comprises a clutch engaging groove (350) and a clutch engaging block (360) that are matched and engaged with each other. The clutch engaging groove (350) and the clutch engaging block (360) are respectively arranged on the end surfaces of the transmission sleeve (330) and the connecting sleeve (310) facing each other. In the radial direction, the clutch engaging groove (350) is an arc-shaped groove structure.

6. The chain over-torque protection device according to claim 4, characterized in that: A first toothed ring (321) is provided on the outer periphery of the sleeve (320), and a second toothed ring (331) meshing with the first toothed ring (321) is provided on the inner periphery of the transmission sleeve (330).

7. The chain over-torque protection device according to claim 4, characterized in that: A limiting ring (370) is sleeved on the outer circumference of the sleeve (320), a limiting step (332) is provided on the inner circumference of the transmission sleeve (330), and the elastic component (340) is arranged between the limiting ring (370) and the limiting step (332).

8. The chain over-torque protection device according to claim 4, characterized in that: The outer periphery of the sleeve (320) is provided with an installation step (322), the inner periphery of the connecting sleeve (310) is provided with a sleeve convex ring (311), and the sleeve convex ring (311) is movably sleeved between the installation step (322) and the transmission sleeve (330).

9. The chain over-torque protection device according to claim 1, characterized in that: The input pulley (200) is evenly distributed with a plurality of connecting screws (220) in an annular shape. The connecting screws (220) penetrate the input pulley (200) in the axial direction and are connected to the torque limiter (300).

10. The chain over-torque protection device according to claim 1, characterized in that: The transmission shaft (100) is provided with an output pulley (500) and at least two bearing seats (600); the input pulley (200) and the torque limiter (300) are arranged between two adjacent bearing seats (600).

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