A force-limited incremental retractor

Abstract

The present invention discloses a force-limiting incremental retractor, comprising: a bracket, a fixed shaft, a moving shaft, a force-limiting rod, and a sleeve. The force-limiting rod is inserted into the sleeve and fixedly connected to the sleeve. One end of the force-limiting rod is fixedly connected to the fixed shaft, and the other end is fixedly connected to the moving shaft. A limiting mechanism is provided between the sleeve and the fixed shaft so that the sleeve stops rotating after rotating to a preset angle. The moving shaft is sleeved on the outside of the sleeve, and the fixed shaft is fixedly installed on the bracket. The outer diameter of the connecting end of the force-limiting rod and the fixed shaft is smaller than the outer diameter of the connecting end of the force-limiting rod connected to the moving shaft. The present invention can realize the incremental force-limiting function, with a small number of parts, a simple structure, and low cost. By adjusting the preset angle of rotation of the sleeve, the duration of the first stage of force-limiting can be adjusted. Different requirements for the start-up time of the incremental force-limiting function under different working conditions can be met, and the scope of application is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of safety components, and more particularly to a force-limited incremental retractor. Background Art

[0002] With the continuous increase in the number of motor vehicles in China, many motor vehicle users have put forward higher requirements for the power and economy of vehicles, and at the same time, they also require vehicles to have good safety. The safety strategy of vehicles is mainly divided into active safety and passive safety. In the passive safety system, seat belts are one of the most important components. The use of seat belts has effectively saved about 45% of lives in traffic accidents and saved 67% of people from serious injuries. When a motor vehicle collides, the impact force of ordinary seat belts on the chest of the occupants can be as high as 11KN or higher, and the compression of the chest of the occupants is relatively large, which can easily cause greater damage to the occupants. Therefore, on the basis of ordinary seat belts, passive safety products that can reduce the impact of webbing on occupants have been developed, such as latches, buckles and force-limiting retractors with energy-absorbing effects.

[0003] In the existing design, not only is the structure of the force-limiting retractor complicated, but also, with the need to protect passengers from injury, different requirements are put forward for the force-limiting form of the force-limiting retractor.

[0004] In summary, how to provide a retractor with a simple structure and various force limiting forms is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a force-limiting incremental retractor, which has a simple structure and can achieve multi-stage force limitation.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A force-limited incremental retractor comprises: a bracket, a fixed shaft, a dynamic shaft, a force-limiting rod, and a sleeve, wherein the force-limiting rod is inserted into the sleeve and fixedly connected to the sleeve, one end of the force-limiting rod is fixedly connected to the fixed shaft, and the other end is fixedly connected to the dynamic shaft, a limiting mechanism is provided between the sleeve and the fixed shaft so that the sleeve stops rotating after rotating a preset angle, the dynamic shaft is sleeved on the outside of the sleeve, the fixed shaft is fixedly mounted on the bracket, and the outer diameter of the connecting end of the force-limiting rod and the fixed shaft is smaller than the outer diameter of the connecting end of the force-limiting rod connected to the dynamic shaft.

[0008] Preferably, the limiting mechanism includes an internal thread arranged at one end of the sleeve close to the fixed shaft, a stopping plate arranged on the fixed shaft, and an external thread arranged on the stopping plate and matched with the internal thread. A preset distance is provided between the end face of the sleeve close to the fixed shaft and the end face of the fixed shaft, and the sleeve is fitted into the stopping plate after rotating by the preset angle.

[0009] Preferably, a first spline is provided on the middle outer portion of the force-limiting rod, and a first spline groove matching and connected with the first spline is provided in the sleeve.

[0010] Preferably, second splines are respectively provided at both ends of the force-limiting rod, and second spline grooves matching and connected with the second splines are provided on both the fixed shaft and the movable shaft.

[0011] Preferably, a pawl is provided on the outside of the fixed shaft, and a first mounting portion for mounting the pawl and limiting the movement of the pawl is provided on the bracket.

[0012] Preferably, a second mounting portion for mounting the webbing is provided on the outer periphery of the movable shaft.

[0013] Preferably, the limiting mechanism includes a first limiting portion arranged at one end of the sleeve close to the fixed axis, a mounting plate arranged on the fixed axis and a second limiting portion arranged on the mounting plate, and when the sleeve rotates by the preset angle, the second limiting portion limits the movement of the first limiting portion.

[0014] Preferably, the first limiting portion is a first protrusion arranged on the sleeve close to the outer circumference of the mounting plate, and the second limiting portion is a second protrusion arranged on the mounting plate.

[0015] Preferably, the end surface of the sleeve close to the mounting plate is fitted to the mounting plate.

[0016] Preferably, a first through hole and a second through hole are arranged opposite to each other on the bracket, the fixed shaft is fixedly installed in the first through hole, and the movable shaft is rotatably arranged in the second through hole.

[0017] The present invention provides a force-limited incremental retractor, comprising: a bracket, a fixed shaft, a dynamic shaft, a force-limiting rod, and a sleeve. The force-limiting rod is inserted into the sleeve and fixedly connected to the sleeve. One end of the force-limiting rod is fixedly connected to the fixed shaft, and the other end is fixedly connected to the dynamic shaft. A limiting mechanism is provided between the sleeve and the fixed shaft so that the sleeve stops rotating after rotating at a preset angle. The dynamic shaft is sleeved on the outside of the sleeve, and the fixed shaft is fixedly installed on the bracket. The outer diameter of the connecting end of the force-limiting rod and the fixed shaft is smaller than the outer diameter of the connecting end of the force-limiting rod connected to the dynamic shaft.

[0018] The present invention can realize the incremental force limiting function, has a small number of parts, a simple structure and low cost. By adjusting the preset angle of rotation of the sleeve, the duration of the first stage of force limiting can be adjusted. Different requirements for the start time of the incremental force limiting function under different working conditions can be met, and the application range is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a force-limited incremental retractor provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the installation of the moving shaft and the fixed shaft provided by the present invention;

[0022] Figure 3 An exploded view of the internal structure of the moving shaft and the fixed shaft of the first embodiment provided by the present invention;

[0023] Figure 4 A front cross-sectional view of a movable shaft and a fixed shaft of a first embodiment provided by the present invention;

[0024] Figure 5 This is a side sectional view of the moving shaft and the fixed shaft of the first embodiment provided by the present invention.

[0025] Figure 6 An exploded view of the internal structure of the moving shaft and the fixed shaft of the second embodiment provided by the present invention;

[0026] Figure 7 A front cross-sectional view of a movable shaft and a fixed shaft of a second embodiment provided by the present invention;

[0027] Figure 8 A side cross-sectional view of a movable shaft and a fixed shaft of a second embodiment provided by the present invention;

[0028] Fig. 9 This is a schematic diagram of the fitting of the sleeve and the fixed shaft of the second embodiment provided by the present invention;

[0029] Fig.10 This is a schematic diagram of a sleeve of the second embodiment provided by the present invention being installed inside a moving shaft;

[0030] Fig.11 A schematic diagram of a force-limiting rod installed in a sleeve according to a second embodiment of the present invention;

[0031] Fig.12 A schematic diagram of a sleeve according to a second embodiment of the present invention;

[0032] Fig.13 This is a schematic diagram of a fixed axis according to a second embodiment of the present invention.

[0033] Figure 1-13 middle:

[0034] 1- bracket, 2- moving shaft, 3- fixed shaft, 4- ratchet, 5- force limiting rod, 6- sleeve, 7- first spline, 8- first spline groove, 9- second spline, 10- second spline groove, 11- external thread, 12- internal thread, 13- first limiting part, 14- second limiting part, 15- stop plate, 16- mounting plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The core of the present invention is to provide a force-limiting incremental retractor, which has a simple structure and can achieve multi-stage force limitation.

[0037] Please refer to Figures 1 to 13 , Figure 1 A schematic diagram of a force-limited incremental retractor provided by the present invention; Figure 2 This is a schematic diagram of the installation of the moving shaft and the fixed shaft provided by the present invention; Figure 3 An exploded view of the internal structure of the moving shaft and the fixed shaft of the first embodiment provided by the present invention; Figure 4 A front cross-sectional view of a movable shaft and a fixed shaft of a first embodiment provided by the present invention; Figure 5 This is a side sectional view of the moving shaft and the fixed shaft of the first embodiment provided by the present invention. Figure 6 An exploded view of the internal structure of the moving shaft and the fixed shaft of the second embodiment provided by the present invention; Figure 7 A front cross-sectional view of a movable shaft and a fixed shaft of a second embodiment provided by the present invention; Figure 8 A side cross-sectional view of a movable shaft and a fixed shaft of a second embodiment provided by the present invention; Fig. 9 This is a schematic diagram of the fitting of the sleeve and the fixed shaft of the second embodiment provided by the present invention; Fig.10 This is a schematic diagram of a sleeve of the second embodiment provided by the present invention being installed inside a moving shaft; Fig.11A schematic diagram of a force-limiting rod installed in a sleeve according to a second embodiment of the present invention; Fig.12 A schematic diagram of a sleeve according to a second embodiment of the present invention; Fig.13 This is a schematic diagram of a fixed axis according to a second embodiment of the present invention.

[0038] A force-limited incremental retractor comprises: a bracket 1, a fixed shaft 3, a moving shaft 2, a force-limiting rod 5, and a sleeve 6. The force-limiting rod 5 is inserted into the sleeve 6 and fixedly connected to the sleeve 6. One end of the force-limiting rod 5 is fixedly connected to the fixed shaft 3, and the other end is fixedly connected to the moving shaft 2. A limiting mechanism is provided between the sleeve 6 and the fixed shaft 3 so that the sleeve 6 stops rotating after rotating a preset angle. The moving shaft 2 is sleeved on the outside of the sleeve 6, and the fixed shaft 3 is fixedly mounted on the bracket 1. The outer diameter of the connecting end of the force-limiting rod 5 and the fixed shaft 3 is smaller than the outer diameter of the connecting end of the force-limiting rod 5 connected to the moving shaft 2.

[0039] It should be noted that one end of the force-limiting rod 5 is fixedly connected to the fixed shaft 3, and the other end is fixedly connected to the moving shaft 2; the force-limiting rod 5 is fixedly connected to the sleeve 6, and the rod diameter of the force-limiting rod 5 near the fixed shaft 3 is smaller, and the rod diameter near the moving shaft 2 is larger. The sleeve 6 is sleeved on the outside of the force-limiting rod 5, and the moving shaft 2 is sleeved on the outside of the sleeve 6. The preset distance is adjustable, and adjusting the distance can control the action time of the first-order low limit force.

[0040] The movable shaft 2 is used to install the webbing, which is wound around the movable shaft 2. Pulling out the webbing will drive the movable shaft 2 to rotate. The fixed shaft 3 is fixedly connected to the bracket 1 and will not rotate. Since the force-limiting rod 5 and the fixed shaft 3 connection end do not rotate, and the force-limiting rod 5 has a smaller rod diameter near the fixed shaft 3 and a larger rod diameter near the movable shaft 2, when the movable shaft 2 rotates, the end with a larger rod diameter does not move relative to the movable shaft 2, and the end with a smaller rod diameter is twisted and deformed, thereby realizing the first-order low force-limiting function. Afterwards, the sleeve 6 will rotate synchronously with the force-limiting rod 5 and the movable shaft 2. At the same time, since a limiting mechanism is provided between the sleeve 6 and the fixed shaft 3, the sleeve 6 can stop rotating after rotating at a preset angle, and then the sleeve 6 cannot rotate relative to the fixed shaft 3 and becomes one with the fixed shaft 3. The movable shaft 2 continues to be pulled and rotated by the webbing, while the force-limiting rod 5 is fixedly connected to the fixed shaft 3 at this time and can no longer rotate, and the force-limiting rod 5 with a larger rod diameter will be twisted and deformed. The second-order larger force-limiting function is realized.

[0041] The present invention can realize the incremental force limiting function, has a small number of parts, a simple structure, and a low cost. By adjusting the preset angle of rotation of the sleeve 6, the duration of the first stage of force limiting can be adjusted. Different requirements for the start time of the incremental force limiting function under different working conditions can be met, and the application range is wide.

[0042] In the first embodiment, the limiting mechanism includes an internal thread 12 arranged at one end of the sleeve 6 close to the fixed shaft 3, a stopping plate 15 arranged on the fixed shaft 3, and an external thread 11 arranged on the stopping plate 15 and matched with the internal thread 12. A preset distance is provided between the end surface of the sleeve 6 close to the fixed shaft 3 and the stopping plate 15, and the sleeve 6 fits against the stopping plate 15 after rotating a preset angle.

[0043] It should be noted that an internal thread 12 may also be provided on the stop plate 15, and an external thread 11 may be provided at the end of the sleeve 6 close to the fixed axis 3. In this embodiment, the length of the thread segment of the external thread 11 may be adjusted to adjust the preset angle of rotation of the sleeve 6. Reducing the length of the thread segment of the external thread 11 within the applicable range may save installation space.

[0044] At the same time, because the sleeve 6 is threadedly connected to the external thread 11, the sleeve 6 will move toward the stop disk 15 when it rotates, and the preset distance between the sleeve 6 and the stop disk 15 is continuously reduced. When the sleeve 6 moves to contact the stop disk 15, the force limiting rod 5 will continue to drive the sleeve 6 to rotate. At this time, the sleeve 6 thread is screwed on the external thread 11, and finally the sleeve 6 cannot rotate relative to the fixed shaft 3 and becomes one with the fixed shaft 3. The moving shaft 2 continues to be pulled and rotated by the webbing, and at this time, the force limiting rod 5 is fixedly connected to the fixed shaft 3 and can no longer rotate. The force limiting rod 5 with a larger rod diameter will be twisted and deformed. A second-order larger force limiting function is achieved.

[0045] The limiting mechanism provided in this embodiment is reliable, simple in structure, and easy to manufacture and install.

[0046] On the basis of the above embodiment, as a further preferred embodiment, a first spline 7 is provided on the middle outer portion of the force limiting rod 5, and a first spline groove 8 matching and connected to the first spline 7 is provided in the sleeve 6. The spline connection method for connecting the force limiting rod 5 and the sleeve 6 can ensure the stability of the connection between the sleeve 6 and the force limiting rod 5, so that the force limiting rod 5 can stably drive the sleeve 6 to rotate.

[0047] On the basis of the above embodiment, as a further preference, second splines 9 are respectively provided at both ends of the force limiting rod 5 , and second spline grooves 10 matching and connected to the second splines 9 are provided on both the fixed shaft 3 and the movable shaft 2 .

[0048] The spline connection method can ensure the stability of the connection between the force limiting rod 5 and the fixed shaft 3 and the force limiting rod 5 and the dynamic shaft 2, prevent the ends of the force limiting rod 5 and the fixed shaft 3 and the force limiting rod 5 and the dynamic shaft 2 from relative rotation, and improve safety.

[0049] On the basis of the above embodiment, as a further preference, a pawl 4 is provided outside the fixed shaft 3 , and a first mounting portion for mounting the pawl 4 and limiting the movement of the pawl 4 is provided on the bracket 1 .

[0050] The first mounting portion can limit the movement of the pawl 4 to limit the rotation of the fixed shaft 3 and make the connection between the fixed shaft 3 and the bracket 1 more stable. The pawl 4 is extended and locked on the bracket 1 to lock the fixed shaft 3 and stop the fixed shaft 3 from rotating.

[0051] On the basis of the above embodiment, as a further preference, a second mounting portion for mounting the webbing is provided on the outer periphery of the moving shaft 2 .

[0052] The second mounting portion is recessed toward the inner side of the moving shaft 2 so that one end of the webbing can be inserted into the second mounting portion for installation. After installation, the webbing is wound around the outer periphery of the moving shaft 2 so that the webbing can be stored and released.

[0053] In the second embodiment, the limiting mechanism includes a first limiting portion 13 arranged at one end of the sleeve 6 close to the fixed shaft 3, a mounting plate 16 arranged on the fixed shaft 3, and a second limiting portion 14 arranged on the mounting plate 16. When the sleeve 6 rotates to the preset angle, the second limiting portion 14 limits the movement of the first limiting portion 13.

[0054] It should be noted that the movable shaft 2 is used to install the webbing, and the webbing is wound around the movable shaft 2. Pulling out the webbing will drive the movable shaft 2 to rotate. The fixed shaft 3 is fixedly connected to the bracket 1 and will not rotate. Since the force-limiting rod 5 and the fixed shaft 3 connection end do not rotate, and the force-limiting rod 5 has a smaller rod diameter near the fixed shaft 3 end and a larger rod diameter near the movable shaft 2 end, when the movable shaft 2 rotates, the end with a larger rod diameter remains stationary relative to the movable shaft 2 and rotates synchronously with the movable shaft 2, and the end with a smaller rod diameter is twisted and deformed, realizing the first-order low force-limiting function. Afterwards, the sleeve 6 will rotate synchronously with the force-limiting rod 5 and the movable shaft 2. The end of the sleeve 6 near the fixed shaft 3 is provided with a first limiting portion 13, and the fixed shaft 3 is provided with a second limiting portion 14. When the sleeve 6 rotates a preset angle, the second limiting portion 14 limits the movement of the first limiting portion 13, so the second limiting portion 14 is set on the rotation path of the first limiting portion 13.

[0055] When the first limiting portion 13 and the second limiting portion 14 are fitted together, the force limiting rod 5 will continue to drive the sleeve 6 to rotate. At this time, the sleeve 6 cannot rotate relative to the fixed shaft 3 and becomes one with the fixed shaft 3. The movable shaft 2 continues to be pulled and rotated by the webbing, while the force limiting rod 5 is fixedly connected to the fixed shaft 3 and can no longer rotate. The force limiting rod 5 with a larger rod diameter will be twisted and deformed, realizing a second-order larger force limiting function.

[0056] This embodiment has a simple structure, is easy to process and has a low cost.

[0057] On the basis of the above embodiment, as a further preference, the first limiting portion 13 is a first protrusion arranged on the outer periphery of the sleeve 6 close to the mounting plate 16 , and the second limiting portion 14 is a second protrusion arranged on the mounting plate 16 .

[0058] The first protrusion is arranged on the mounting plate 16, and the axial thickness of the first protrusion along the sleeve 6 is the same as the axial thickness of the second protrusion along the sleeve 6. The specific shapes and sizes of the first protrusion and the second protrusion can be set according to the actual application situation, and the first protrusion and the second protrusion need to have a certain strength to prevent disconnection. This embodiment has a simple structure and is easy to process and install.

[0059] On the basis of the above embodiment, as a further preference, the end surface of the sleeve 6 close to the mounting plate 16 is in contact with the mounting plate 16 .

[0060] Fitting the end surface of the sleeve 6 provided with the first protrusion to the end surface of the mounting plate 16 can reduce the space between the sleeve 6 and the mounting plate 16, thereby reducing the overall space of the force-limited incremental retractor.

[0061] On the basis of the above embodiment, as a further preference, a first through hole and a second through hole are relatively arranged on the bracket 1, the fixed shaft 3 is fixedly installed in the first through hole, and the movable shaft 2 is rotatably arranged in the second through hole.

[0062] The sizes of the first through hole and the second through hole can be set according to the ends of the fixed shaft 3 and the movable shaft 2. The fixed shaft 3 passes through the first through hole, and the movable shaft 2 passes through the second through hole. The fixed shaft 3 is fixedly connected to the first through hole to prevent the fixed shaft 3 from rotating. The movable shaft 2 passes through the second through hole and is rotatably connected to the second through hole. The first through hole and the second through hole can be set to stably install the fixed shaft 3 and the movable shaft 2.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] The above is a detailed introduction to the force-limited incremental retractor provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A force-limited incremental retractor, characterized in that: include: A bracket (1), a fixed shaft (3), a movable shaft (2), a force-limiting rod (5), and a sleeve (6); the force-limiting rod (5) is inserted into the sleeve (6) and fixedly connected to the sleeve (6); one end of the force-limiting rod (5) is fixedly connected to the fixed shaft (3), and the other end is fixedly connected to the movable shaft (2); a limiting mechanism is provided between the sleeve (6) and the fixed shaft (3), so that the sleeve (6) stops rotating after rotating a preset angle; the movable shaft (2) is sleeved on the outside of the sleeve (6), and the movable shaft (2) and the sleeve (6) can rotate relative to each other; the fixed shaft (3) is fixedly mounted on the bracket (1); and the outer diameter of the connecting end of the force-limiting rod (5) and the fixed shaft (3) is smaller than the outer diameter of the connecting end of the force-limiting rod (5) and the movable shaft (2); When the movable shaft (2) rotates, the end of the force-limiting rod (5) with a larger rod diameter remains stationary relative to the movable shaft (2), while the end with a smaller rod diameter is twisted and deformed, thereby realizing a first-order low force-limiting function; the sleeve (6) can rotate synchronously with the force-limiting rod (5) and the movable shaft (2), and the sleeve (6) stops rotating after rotating to a preset angle. If the movable shaft (2) continues to rotate, the end of the force-limiting rod (5) with a larger rod diameter will be twisted and deformed, thereby realizing a second-order force-limiting function; A first spline (7) is provided on the middle outer portion of the force limiting rod (5), and a first spline groove (8) matching and connected with the first spline (7) is provided in the sleeve (6); The two ends of the force-limiting rod (5) are respectively provided with second splines (9), and the fixed shaft (3) and the movable shaft (2) are both provided with second spline grooves (10) matched and connected with the second splines (9); A pawl (4) is provided on the outside of the fixed shaft (3), and a first mounting portion for mounting the pawl (4) and limiting the movement of the pawl (4) is provided on the bracket (1).

2. The force-limited incremental retractor according to claim 1, characterized in that: The limiting mechanism comprises an internal thread (12) arranged at one end of the sleeve (6) close to the fixed shaft (3), a stop plate (15) arranged on the fixed shaft (3), and an external thread (11) arranged on the stop plate (15) and matched with the internal thread (12). A preset distance is provided between the end surface of the sleeve (6) close to the fixed shaft (3) and the end surface of the fixed shaft (3). The sleeve (6) is fitted onto the stop plate (15) after rotating at the preset angle.

3. The force-limited incremental retractor according to claim 1, characterized in that: The outer periphery of the movable shaft (2) is provided with a second mounting portion for mounting the webbing.

4. The force-limited incremental retractor according to claim 1, characterized in that: The limiting mechanism comprises a first limiting portion (13) arranged at one end of the sleeve (6) close to the fixed shaft (3), a mounting plate (16) arranged on the fixed shaft (3), and a second limiting portion (14) arranged on the mounting plate (16); when the sleeve (6) rotates to the preset angle, the second limiting portion (14) limits the movement of the first limiting portion (13).

5. The force-limited incremental retractor according to claim 4, characterized in that: The first limiting portion (13) is a first protrusion arranged on the outer periphery of the sleeve (6) close to the mounting plate (16), and the second limiting portion (14) is a second protrusion arranged on the mounting plate (16).

6. The force-limited incremental retractor according to claim 4, characterized in that: The end surface of the sleeve (6) close to the mounting plate (16) is fitted to the mounting plate (16).

7. The force-limited incremental retractor according to claim 1, characterized in that: The bracket (1) is provided with a first through hole and a second through hole opposite to each other, the fixed shaft (3) is fixedly mounted in the first through hole, and the movable shaft (2) is rotatably arranged in the second through hole.

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