Safety belt device

Abstract

The invention provides a safety belt device. The seatbelt device includes: a seatbelt retractor mounted on a backrest of a seat and including a mandrel on which a seatbelt is wound; the acceleration sensor is used for detecting acceleration of a vehicle in the front-back direction and locking rotation of the mandrel in the drawing-out direction of the safety belt on the basis of the detected acceleration; the attitude controller is used for keeping the reference surface of the acceleration sensor horizontal; the clutch device is connected with the core shaft and activates the acceleration sensor to lock the core shaft under a preset condition; the safety belt locking device further comprises an unlocking device, and the unlocking device is used for unlocking the core shaft by the clutch device when the preset condition is not met and the core shaft rotates in the pulling-out direction of the safety belt.

Description

Technical Field

[0001] This invention relates to safety devices for vehicles, and more specifically, to seat belt devices. Background Technology

[0002] As a safety device in vehicles, seat belts are used to restrain occupants during a collision, preventing them from secondary impacts with the steering wheel and dashboard, or from being ejected from the vehicle and suffering injury or death. Seat belts used in vehicles are also known as seat belts and are a type of occupant restraint device. They are recognized as the cheapest and most effective safety device, and many countries mandate their use in vehicles.

[0003] The seatbelt device includes a seatbelt and a seatbelt retractor for winding the seatbelt. In the event of a collision or other incident where the horizontal acceleration experienced by the vehicle exceeds a specified value, an acceleration sensor detects this acceleration, triggering a locking mechanism that prevents the seatbelt from being pulled out.

[0004] Today, both the backrest and seat cushion of a seat are movable, providing passengers with a more comfortable seating angle. Therefore, when installing a seatbelt retractor, which includes the aforementioned acceleration sensor, on the backrest, the retractor's posture needs to be adjusted according to the backrest's tilt angle. This ensures that the installed acceleration sensor is not affected by the angle of the seat's movable backrest, allowing for accurate acceleration detection.

[0005] In order to provide better comfort, the seats in autonomous vehicles are designed differently from those in traditional vehicles. For example, the seat cushion is designed to be higher, and the backrest is designed to have a wider range of tilt angles relative to the seat cushion. In other words, the seats have a large range of adjustment angles and multiple adjustment postures.

[0006] Therefore, a seatbelt device is desired that can provide passengers with a comfortable experience while adjusting the seat in a wide range of adjustment angles and multiple adjustment postures. Summary of the Invention

[0007] The purpose of this invention is to provide a seat belt device that provides a comfortable experience for passengers while adjusting the seat in a wide range of adjustment angles and multiple adjustment postures.

[0008] This invention provides a seatbelt device, comprising:

[0009] The seatbelt retractor is mounted on the back of the seat and includes...

[0010] A spindle with a safety belt wound around it;

[0011] An acceleration sensor is used to detect the vehicle's acceleration in the longitudinal direction, and, based on the detected acceleration, to lock the rotation of the spindle along the pull-out direction of the seat belt;

[0012] An attitude controller for keeping the reference plane of the accelerometer horizontal; and

[0013] A clutch device, which is connected to the spindle and activates the accelerometer to lock the spindle under predetermined conditions;

[0014] in,

[0015] It also includes an unlocking device for releasing the clutch device from locking the spindle when the spindle rotates in the pull-out direction of the seat belt if the predetermined conditions are not met.

[0016] According to an embodiment of the present invention, the clutch device has a first engaging portion and a second engaging portion, the first engaging portion being torsionally connected to the spindle, and when the spindle rotates along the seatbelt withdrawal direction under the predetermined conditions, the first engaging portion rotates with the spindle, thereby driving the second engaging portion to move to switch from a non-engaged state to an engaged state with the acceleration sensor, thereby locking the rotation of the spindle along the seatbelt withdrawal direction; and

[0017] The unlocking device applies a force to the second mating part, moving it away from the acceleration sensor.

[0018] According to an embodiment of the present invention, the unlocking device is configured as a solenoid valve assembly, and the second mating part moves toward a direction away from the accelerometer under the action of the magnetic force applied by the solenoid valve assembly.

[0019] According to an embodiment of the present invention, the solenoid valve assembly directly applies magnetic force to the second mating part.

[0020] According to an embodiment of the present invention, the solenoid valve assembly includes an electromagnetic actuator, a reset member, and a linkage member. Under the action of the magnetic force applied by the electromagnetic actuator, the linkage member moves from a first position to a second position against the reset force applied by the reset member. Furthermore, the second mating part moves in conjunction with the linkage member toward a direction away from the acceleration sensor.

[0021] According to an embodiment of the present invention, the linkage has a hook at one end, and the second mating part is positioned in the hook.

[0022] According to an embodiment of the present invention, the solenoid valve assembly further includes a housing, and the first end of the linkage is rotatably fixed to the housing, and,

[0023] The reset element is constructed as a spring, with one end fixed to the housing and the other end fixed to the first end of the linkage element.

[0024] According to an embodiment of the present invention, the clutch device and the unlocking device are fixed on the end cap, and the spindle is rotatably supported on the end cap.

[0025] According to an embodiment of the present invention, the acceleration sensor includes a mounting bracket, an inertial ball, and a base, the base including a support surface for holding the inertial ball, the base including a rocking shaft extending along the left-right direction of the vehicle, and being held on the mounting bracket in a rotatable manner via the rocking shaft in the front-rear direction;

[0026] The attitude controller is connected to the lower side of the base and can swing freely to drive the base of the accelerometer to rock in the front-back direction via the rocking shaft.

[0027] According to an embodiment of the present invention, the first mating part of the clutch device is interference-fitted with the end of the spindle;

[0028] And / or,

[0029] The second mating portion of the clutch device is configured as a support leg portion with a bent end, the acceleration sensor further includes a relative mating portion, and in the engaged state, the bent end of the support leg portion engages with the teeth of the relative mating portion. Attached Figure Description

[0030] The features, advantages, and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. In the drawings, the same symbols denote the same elements, wherein:

[0031] Figure 1 A seat with the seat belt device of the present invention is shown schematically.

[0032] Figure 2 A seatbelt device according to a first embodiment of the present invention is shown schematically.

[0033] Figure 3 and Figure 4 A seatbelt device according to a second embodiment of the present invention is schematically shown;

[0034] Figure 5 The diagram schematically illustrates some components of a seatbelt device according to an embodiment of the present invention. Detailed Implementation

[0035] The following describes specific embodiments of the seatbelt device according to the present invention in conjunction with the accompanying drawings. The detailed description and drawings below are provided to exemplify the principles of the invention. The invention is not limited to the described preferred embodiments; the various embodiments described can be used individually or in any combination. The scope of protection of the invention is defined by the claims.

[0036] Furthermore, spatially related terms (such as "up," "down," "left," and "right") are used to describe the relative positional relationship between elements shown in the accompanying drawings and other elements. Therefore, spatially related terms can be applied to directions different from those shown in the accompanying drawings. Clearly, while all these spatially related terms refer to the directions shown in the accompanying drawings for ease of explanation, those skilled in the art will understand that directions different from those shown in the accompanying drawings can be used.

[0037] Figure 1 A seat with the seat belt device of the present invention is shown schematically. Figure 2 A seatbelt device according to a first embodiment of the present invention is shown schematically. Figure 5 The diagram schematically illustrates some components of a seatbelt device according to an embodiment of the present invention.

[0038] like Figure 1 As shown, the present invention provides a seat belt device 1, which is to be installed on a seat. Specifically, see... Figure 2 The seatbelt device 1 includes a seatbelt retractor 100, which is mounted on the seat backrest 3 and works in conjunction with the seatbelt to restrain the passenger in the seat. This protects the passenger from injury by impact with interior components in the event of a collision. The seat cushion 2 is designed to be adjustable over a wide range of angles, and the seat backrest 3 is also designed to be adjustable over a wide range of angles; that is, the seat has a large range of adjustment angles and multiple adjustable postures.

[0039] like Figure 2 As shown, the seatbelt retractor 100 includes a spindle 10, an acceleration sensor 20, an attitude controller 30, and a clutch device 40. These components of the seatbelt retractor 100 are described in detail below.

[0040] It should be noted that, due to the obstruction of other components, Figure 2 The mandrel is not clearly shown, but for ease of description, its approximate location is indicated by markings. The mandrel 10 is used to wind the seatbelt (not shown). When the mandrel 10 rotates about a first direction of rotation, the seatbelt winds onto the mandrel 10; when the mandrel 10 rotates about a second direction of rotation opposite to the first direction of rotation, the seatbelt is pulled away from the mandrel 10. Figure 2In the illustrated embodiment, the first rotation direction is clockwise (B), and the second rotation direction is counterclockwise (A). In one example, a retractor spring can be connected to one axial end of the spindle 10. This retractor spring is used to apply force to the spindle 10 in the winding direction of the seatbelt to rotate the spindle 10. At the other axial end of the spindle 10, such as... Figure 2 As shown, an acceleration sensor 20, an attitude controller 30, and a clutch device 40 are provided. Optionally, as... Figure 2 As shown, the seatbelt retractor 100 also includes an end cap, on which the spindle 10 is rotatably supported at one end. Furthermore, the acceleration sensor 20, the attitude controller 30, and the clutch device 40 are all mounted on the end side of the end cap.

[0041] It should be noted that the acceleration sensor 20 of the seatbelt retractor 100 is used to detect the vehicle's acceleration in the longitudinal direction, and, based on the detected acceleration, to lock the rotation of the locking spindle 10 and thus lock the seatbelt's pull-out action; that is, to lock the rotation of the locking spindle 10 in the second rotational direction described above. The attitude controller 30 is used to keep the reference plane of the acceleration sensor 20 horizontal. Specifically, the attitude controller 30 is used to always keep the reference plane of the acceleration sensor 20 slightly horizontal, regardless of changes in the recline angle of the seat back. The clutch device 40 is connected to the spindle 10 and, under predetermined conditions, activates the locking of the acceleration sensor 20 onto the spindle 10.

[0042] In embodiments of the present invention, the attitude controller 30 can be configured as a counterweight and connected to the base of the accelerometer 20 in a pendulum-like manner. For example, the counterweight has a chamber, and a portion of the base is housed within the chamber and maintains a predetermined distance from the inner wall of the chamber. A through-hole is provided on the side wall of the chamber of the counterweight, and a protrusion is provided on the base. The protrusion of the base is positioned within the through-hole of the counterweight, such that the counterweight is snapped onto the lower part of the base. Of course, the connection method between the base and the counterweight is not limited to this; for example, the counterweight can be connected to the lower side of the base via a rope. It is understood that due to gravity, a freely swinging base tends to remain in a vertical position. To stabilize this vertical position, a counterweight is added to the lower side of the base. Therefore, regardless of the angle of the vehicle and the seat back, the counterweight can drive the base connected to it to swing along the longitudinal direction of the vehicle to a vertical position, at which point the reference plane of the base is substantially horizontal. When the seat backrest tilts backward, the attitude controller 30, under the influence of gravity, causes the base of the acceleration sensor 20 to rotate toward the rear of the vehicle. When the seat backrest rotates forward, the attitude controller 30, under the influence of gravity, causes the base of the acceleration sensor 20 to rotate toward the front of the vehicle. Even when the seat backrest is tilted in the fore-and-aft direction, the attitude controller 30 can still cause the base of the acceleration sensor 20 to rock in the fore-and-aft direction of the vehicle until the base is in a basically horizontal position. Thus, in the fore-and-aft direction of the vehicle, the support surface of the inertial ball, which serves as the reference plane, is kept in a slightly horizontal state.

[0043] When the horizontal acceleration experienced by the vehicle exceeds a specified value, the inertial ball of the acceleration sensor 20 begins to displace as an inertial body from its neutral position. The first sensor lever of the actuating component of the acceleration sensor 20 is linked with the inertial ball when it displaces in the forward-backward direction of the vehicle, and transmits this linkage to the pawl of the locking mechanism via the second sensor lever. As a result, the pawl abuts against the teeth on the ratchet, causing the locking mechanism to move toward the side that locks the seat belt pull-out action, thereby locking the rotation of the spindle 10 in the seat belt pull-out direction.

[0044] The clutch device 40 is connected to the spindle 10 and, under predetermined conditions, activates the accelerometer 20 to lock the spindle 10.

[0045] Specifically, in combination Figure 5As shown, the clutch device 40 has a first engaging portion 401 and a second engaging portion 402. The first engaging portion 401 is torsionally connected to the spindle 10; for example, the first engaging portion 401 is interference-fitted with the end of the spindle 10 to rotate together with the spindle 10. Furthermore, when the spindle 10 rotates in the seatbelt withdrawal direction under predetermined conditions, the first engaging portion 401 rotates with the spindle 10, thereby driving the second engaging portion 402 to move and transition from a non-engaged state to an engaged state with the acceleration sensor 20. Specifically, for Figure 5 The clutch device 40 shown, when the spindle 10 rotates counterclockwise A under predetermined conditions, the first engaging part 401 of the clutch device 40 rotates counterclockwise along with the spindle 10, thereby driving the second engaging part 402 to rotate counterclockwise from a position away from the acceleration sensor 20 until... Figure 5 The position shown indicates that the second mating part 402 and the acceleration sensor 20 transition from a non-engaged state to an engaged state, as indicated by the following engagement state. Figure 5 As shown.

[0046] As a type of joining, such as Figure 5 As shown, the second mating part 402 is constructed as a leg portion with a bent end. Correspondingly, the accelerometer 20 also includes a relative mating part 201, which can be constructed as a fan-shaped member with teeth. In the engaged state, the bent end of the leg portion engages with the teeth of the relative mating part 201. When the bent end of the second mating part 402 of the clutch device 40 engages with the teeth of the relative mating part 201, the second mating part 402 abuts against the relative mating part 201 at its bent end, thereby resisting further counterclockwise rotation. Therefore, the first mating part 401 and the spindle 10 are similarly resisted from further counterclockwise rotation. Thus, the clutch device 40 locks the rotation of the spindle 10 along the seatbelt withdrawal direction. Of course, the relative mating part of the accelerometer is not limited to the above form; any structure that can abut against the second mating part to prevent further rotation can be used, such as a stepped portion. Meanwhile, in this situation, the base of the accelerometer 20 is fixed and cannot be shaken because the relative mating part 201 is abutted by the second mating part 402 of the clutch device 40. However, the inertial ball can be displaced from the neutral position as an inertial body due to inertia, so as to lock the rotation of the spindle 10 in the direction of the seat belt withdrawal.

[0047] In one example, the second mating part 402 is formed from a strip-shaped member, with one end bent to form a bent end and the other end bent to form a bent portion. The bent end and the bent portion are spaced apart by a certain distance to accommodate the distance between the mandrel 10 and the accelerometer 20. Of course, the manufacturing method of the second mating part described above is merely an example; other methods can also be used to manufacture the second mating part, such as splicing multiple segments to form the second mating part. Furthermore, as... Figure 5 As shown, in order to provide a connection between the first mating part 401 and the second mating part 402, a groove is provided on one end of the first mating part 401, and the bent portion of the second mating part 402 is engaged with the groove of the first mating part 401. It should be noted that, since the first mating part 401 and the second mating part 402 are engaged, if the force on the spindle 10 that causes it to rotate counterclockwise is greater than the frictional force between the first mating part 401 and the second mating part 402, relative rotation will occur between the first mating part 401 and the second mating part 402. In this case, the bent end of the second mating part 402 remains engaged with the opposing mating part 201 and cannot rotate further counterclockwise, while the spindle 10 and the first mating part 401 can rotate further counterclockwise. In other words, in the clutch device 40 of the present invention, the frictional force between the first mating part 401 and the second mating part 402 is much less than the force applied to the clutch device 40 when the seat belt is normally pulled out. For example, the frictional force is set to 10% of the force applied to the clutch device 40 when the seat belt is normally pulled out. Therefore, the clutch device 40 will not affect the seat belt pulling-out action in normal use scenarios.

[0048] The predetermined conditions described above include situations where the vehicle's acceleration exceeds a predetermined value, i.e., a situation where a collision causes a sharp deceleration.

[0049] However, considering that a longer seatbelt allowance is required during the rearward adjustment of the seat backrest 3 due to the change in the relative position of the occupant and the seat, the seatbelt retractor 100 needs to continuously pull out the webbing. However, during this process, the clutch 40 and the acceleration sensor 20 remain engaged, causing the acceleration sensor (especially the reference surface of its base) to fail to adjust to a roughly horizontal position as the angle of the seat backrest 3 changes. Therefore, when the adjustment angle of the backrest 3 is too large, the inertial ball of the acceleration sensor will lock the seatbelt spindle, preventing further webbing extraction. At this point, the occupant experiences discomfort due to the tight webbing, without achieving a longer webbing allowance.

[0050] To solve the above problems, the seat belt retractor 100 of the seat belt device 1 of the present invention further includes a locking device, which is used to release the locking of the clutch device 40 on the spindle 10 when the spindle 10 rotates in the pull-out direction of the seat belt if the above predetermined conditions are not met.

[0051] Alternatively, the unlocking device can be configured as a solenoid valve assembly 50, and the second engaging portion 402 of the clutch device 40 moves away from the acceleration sensor 20 under the action of the magnetic force applied by the solenoid valve assembly 50.

[0052] like Figure 2 As shown, the solenoid valve assembly 50 can directly apply magnetic force to the second mating part 402. The solenoid valve assembly 50 may include a housing, a coil, and a magnetic core. The housing of the solenoid valve assembly 50 is also fixed to the end cap, and the housing, along with the accelerometer 20 and the attitude controller 30, are located on opposite sides of the second mating part 402. When a predetermined condition is not met and the seatbelt is pulled out, the coil is energized, and the magnetic core attracts the second mating part 402, causing the second mating part 402 to abut against the magnetic core. This moves the second mating part 402 away from the accelerometer 20, particularly the opposite mating part 201, thereby releasing the lock between the clutch and the accelerometer. This arrangement provides a simple and economical way to release the lock between the clutch and the accelerometer.

[0053] Alternatively, as another embodiment, such as Figure 3 and Figure 4 As shown, the solenoid valve assembly 50 also includes a housing 524 fixed to the end cap. In addition, the solenoid valve assembly 50 also includes an electromagnetic actuator 525 (i.e., a magnetic core), a reset member 521, and a linkage member 522.

[0054] In one example, the reset member 521 is a helical spring, one end of which is fixed to the protrusion of the housing 524 by an annular portion, and the other end of which is fixed to the end of the linkage member 522 by another annular portion.

[0055] In one example, the linkage 522 is configured to be supported at the housing 524 in the form of a lever, that is, in Figure 4In this configuration, the left end, or first end, of the linkage 522 is rotatably connected to the housing 524. The left end of the linkage 522 is connected to the reset member 521, and the other end is connected to the second mating part 402. When only the reset member 521 applies force to the linkage 522, the left end of the linkage 522 is pulled to a lower position by the reset member 521, at which time the right end of the linkage 522 is in a higher position. When the electromagnetic actuator 525 applies force to the linkage 522, since the positions where the electromagnetic actuator 525 applies force and the positions where the reset member 521 applies force are located on either side of the support position where the linkage 522 is supported by the housing 524, and the force applied by the electromagnetic actuator 525 is greater, the right end of the linkage 522 descends while the left end rises. Furthermore, since the second mating part 402 is connected to the end of the linkage 522, the linkage 522... Figure 4 The rise and fall at the middle right end will be transformed into Figure 3 The left and right displacement of the second mating part 402. Specifically, Figure 4 The right end of the linkage 522 in the middle descended, causing Figure 3 The second mating part 402 in the middle is shifted to the left; and, Figure 4 The right end of the linkage 522 in the middle rises, causing Figure 3 The second mating part 402 is shifted to the right. In one example, the linkage 522 has a hook 523 located at one end where the second mating part 402 is located, and the second mating part 402 is positioned in the hook 523. As shown in the figure, the recessed space of the hook 523 is significantly larger than the lateral dimension of the second mating part. It can be understood that this arrangement is to cause the second mating part 402 to move while not interfering with the normal operation of the second mating part 402. Therefore, by providing a hook, the second mating part 402 is linked with the linkage 522.

[0056] Under the magnetic force applied by the electromagnetic actuator 525, the linkage 522 overcomes the elastic force applied by the reset member 521 and moves from the first position to the second position, that is, it is attracted to and abuts against the electromagnetic actuator 525. Figure 3 In the orientation shown, the second position is to the left of the first position, that is, farther from the accelerometer 20. Thus, the linkage 522 moves the second mating part 402 away from the accelerometer 20. Conversely, under the sole action of the reset member 521, the first end of the linkage 522 is brought closer to the reset member 521 by its elastic force, and the hook 523 moves closer to the accelerometer 20, allowing the second mating part 402 to engage with the accelerometer 20 from a non-engaged state. By setting the linkage, the magnetic attraction efficiency is improved, allowing the same attraction force to be applied with less current, thus saving energy.

[0057] Therefore, in the seat belt device of the present invention, by providing an unlocking device, during the adjustment of the seat with a wide range of adjustment angles and multiple adjustment postures, the inertial ball of the acceleration sensor is prevented from locking the spindle of the seat belt, ensuring that the webbing can continue to be pulled out, so that the occupant can get sufficient webbing wearing amount, thereby providing a comfortable experience for the passenger.

[0058] As mentioned above, although exemplary embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the specific embodiments described above, and the scope of protection of the present invention should be defined by the claims and their equivalents.

Claims

1. A seatbelt device (1), comprising: A seatbelt retractor (100) is mounted on the backrest (3) of the seat and includes a spindle (10) on which the seatbelt is wound. An acceleration sensor (20) is used to detect the acceleration of the vehicle in the longitudinal direction, and, based on the detected acceleration, to lock the rotation of the spindle (10) along the pull-out direction of the seat belt; An attitude controller (30) is used to keep the reference plane of the accelerometer (20) horizontal; and A clutch device (40) is connected to the spindle (10) and, under predetermined conditions, activates the accelerometer (20) to lock the spindle (10); Its features are, It also includes an unlocking device for releasing the locking of the clutch device (40) on the spindle (10) when the spindle (10) rotates along the pull-out direction of the seat belt if the predetermined conditions are not met.

2. The seat belt device (1) according to claim 1, wherein, The clutch device (40) has a first engaging portion (401) and a second engaging portion (402). The first engaging portion (401) is torsionally connected to the spindle (10), and when the spindle (10) rotates along the seatbelt pull-out direction under the predetermined conditions, the first engaging portion (401) rotates with the spindle (10), thereby driving the second engaging portion (402) to move from a non-engaged state to an engaged state with the acceleration sensor (20), thereby locking the rotation of the spindle (10) along the seatbelt pull-out direction; and The unlocking device applies a force to the second mating part (402) to move it away from the acceleration sensor (20).

3. The seat belt device (1) according to claim 2, wherein, The unlocking device is configured as a solenoid valve assembly (50), and the second mating part (402) moves away from the acceleration sensor (20) under the action of the magnetic force applied by the solenoid valve assembly (50).

4. The seat belt device (1) according to claim 3, wherein, The solenoid valve assembly (50) directly applies magnetic force to the second mating part (402).

5. The seat belt device (1) according to claim 3, wherein, The solenoid valve assembly (50) includes an electromagnetic actuator (525), a reset member (521), and a linkage member (522). Under the action of the magnetic force applied by the electromagnetic actuator (525), the linkage member (522) moves from a first position to a second position against the reset force applied by the reset member (521). Furthermore, the second mating part (402) moves in conjunction with the linkage member (522) toward a direction away from the acceleration sensor (20).

6. The seat belt device (1) according to claim 5, wherein, The linkage (522) has a hook (523) located at one end, and the second mating part (402) is positioned in the hook (523).

7. The seat belt device (1) according to claim 6, wherein, The solenoid valve assembly (50) further includes a housing (524), the first end of which is rotatably fixed to the housing (524), and, The reset member (521) is constructed as a spring, with one end fixed to the housing (524) and the other end fixed to the first end of the linkage member (522).

8. The seat belt device (1) according to claim 1, wherein, The clutch device (40) and the unlocking device are fixed on the end cover, and the spindle (10) is rotatably supported on the end cover.

9. The seat belt device (1) according to claim 1, wherein, The acceleration sensor (20) includes a mounting bracket, an inertial ball, and a base. The base includes a support surface for holding the inertial ball. The base includes a rocking shaft extending along the left-right direction of the vehicle and is held on the mounting bracket in a rotatable manner via the rocking shaft in the front-rear direction. The attitude controller (30) is connected to the lower side of the base and is able to swing freely to drive the base of the accelerometer (20) to rock in the front-back direction via the rocking shaft.

10. The seat belt device (1) according to claim 9, wherein, The first mating part (402) of the clutch device (40) is interference-fitted with the end of the spindle (10); And / or, The second mating portion (402) of the clutch device (40) is configured as a support leg portion with a bent end, the acceleration sensor (20) further includes a relative mating portion (201), and in the engaged state, the bent end of the support leg portion engages with the teeth of the relative mating portion (201).

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