Safety belt device

Abstract

The invention provides a safety belt device. The safety belt device comprises a safety belt retractor which is installed on a backrest of a seat and comprises a mandrel, an acceleration sensor, a posture controller and a clutch device, and the clutch device is connected with the mandrel and activates the acceleration sensor to lock the mandrel under preset conditions; the acceleration sensor comprises a mounting frame, an inertia ball and a base; the attitude controller is connected to the lower side of the base and can freely swing to drive the base of the acceleration sensor to swing in the front-back direction through the swing shaft; the clutch device is provided with a first matching part and a second matching part, the first matching part is connected to the core shaft in an anti-torque mode, and when the core shaft rotates in the safety belt pulling-out direction under the preset condition, the first matching part rotates along with the core shaft, so that the second matching part is driven to move to be converted from a non-joint state to a joint state with the acceleration sensor; therefore, rotation of the mandrel in the safety belt pulling-out direction is locked.

Description

Technical Field

[0001] The present invention relates to a safety device for a vehicle, and more particularly, to a seat belt device. Background Art

[0002] A seat belt for a vehicle is a safety device that is used to restrain an occupant during a collision and prevent the occupant from colliding with the steering wheel, instrument panel, etc. for a second time during the collision, or prevent the occupant from being thrown out of the vehicle and causing injury or death during the collision. A seat belt for a vehicle, also known as a seat belt, is an occupant restraint device. Such a seat belt is recognized as the cheapest and most effective safety device, and many countries mandate the installation of seat belts in vehicle equipment.

[0003] A seat belt device includes a seat belt and a seat belt retractor that winds the seat belt. In the event of a collision or the like in a vehicle, when the acceleration in the horizontal direction received by the vehicle is greater than a specified value, the acceleration is detected by an acceleration sensor, thereby triggering the locking mechanism to operate and making it impossible to pull out the seat belt.

[0004] Nowadays, both the backrest and seat cushion of a seat are movable, so as to provide a more comfortable sitting angle for passengers. Therefore, when installing the seat belt retractor including the above acceleration sensor on the backrest, it is necessary to adjust the posture of the seat belt retractor according to the inclination angle of the backrest, so as to ensure that the acceleration sensor after installation is not affected by the angle of the movable backrest of the seat, and accurately detect the acceleration.

[0005] In an autonomous vehicle, in order to provide a more comfortable seat, the seat is designed in a different way from a traditional vehicle seat. For example, the seat cushion of the seat is designed to have a higher height, and for another example, the backrest of the seat is designed to have a larger range of inclination angles relative to the seat cushion, that is, the seat has a large adjustment angle range and multiple adjustment postures.

[0006] Therefore, there is a need for a seat belt device suitable for use in a seat with a large adjustment angle range and multiple adjustment postures. Summary of the Invention

[0007] An object of the present invention is to provide a seat belt device suitable for use in a seat with a large adjustment angle range and multiple adjustment postures.

[0008] The present invention provides a seat belt device, including:

[0009] A seat belt retractor, which is installed on the backrest of the seat and includes

[0010] A mandrel around which a seat belt is wound;

[0011] An acceleration sensor for detecting the acceleration of a vehicle in the front-rear direction and, based on the detected acceleration, locking the rotation of the mandrel and thus locking the retraction action of the seat belt;

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

[0013] A clutch device connected to the mandrel and activating the locking of the mandrel by the acceleration sensor under a predetermined condition;

[0014] Wherein,

[0015] The acceleration sensor includes a mounting bracket, an inertia ball and a base. The base includes a support surface for holding the inertia ball. The base includes a rocking shaft extending in the left-right direction of the vehicle and is held on the mounting bracket via the rocking shaft so as to be rotatable in the front-rear direction;

[0016] The attitude controller is connected to the lower side of the base and can swing freely to drive the base of the acceleration sensor to rock in the front-rear direction via the rocking shaft;

[0017] The clutch device has a first engaging portion and a second engaging portion. The first engaging portion is torsionally connected to the mandrel. When the mandrel rotates in the seat belt retraction direction under the predetermined condition, the first engaging portion rotates together with the mandrel, thereby driving the second engaging portion to move to switch from a non-engaged state to an engaged state with the acceleration sensor, so as to lock the rotation of the mandrel in the seat belt retraction direction.

[0018] According to an embodiment of the present invention, the attitude controller is configured as a counterweight block. The counterweight block has a chamber, and a part of the base is accommodated in the chamber and maintains a predetermined distance from the inner wall of the chamber.

[0019] According to an embodiment of the present invention, through holes are provided on the side wall of the chamber of the counterweight block, and protrusions are provided on the lower side surface of the base. The protrusions are positioned in the through holes.

[0020] According to an embodiment of the present invention, the first engaging portion of the clutch device is in interference fit with the end of the mandrel, and the first engaging portion further has teeth meshing with an external module;

[0021] And / or,

[0022] The second engaging portion of the clutch device is configured as a leg portion with a bent end. The acceleration sensor further includes a relative engaging portion. In the engaged state, the bent end of the leg portion cooperates with the tooth portion of the relative engaging portion.

[0023] According to an embodiment of the present invention, the second engaging portion is formed by a strip-shaped member and has the bent end and a bent portion spaced apart therefrom, and the bent portion is connected to the first engaging portion in a snap-fitting manner.

[0024] According to an embodiment of the present invention, the acceleration sensor further includes an actuating member, and the actuating member is linked to the movement of the inertial ball in the front-rear direction so that the retracting action of the seat belt is locked by a locking mechanism.

[0025] According to an embodiment of the present invention, the actuating member includes a first sensor lever, and the first sensor lever is rotatably held on the base in the front-rear direction and is linked to the base via the inertial ball.

[0026] According to an embodiment of the present invention, the first sensor lever is rotatably connected to an edge of the base, and the opposing engaging portion is spaced apart from the first sensor lever by a predetermined distance on a periphery of the base and is fixed to the edge of the base.

[0027] According to an embodiment of the present invention, the mounting bracket includes opposing first and second side portions, support holes for supporting the rocking shaft are respectively provided on the first and second side portions, and the bent end of the second engaging portion of the clutch device is positioned inside the mounting bracket.

[0028] According to an embodiment of the present invention, the mounting bracket is provided on an end cover for mounting the clutch device;

[0029] and / or

[0030] The locking mechanism of the seat belt retractor includes a ratchet fixed to the core shaft, and rotation of the first sensor lever on the base actuates a pawl to cooperate with the ratchet. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals denote the same elements, wherein:

[0032] Figure 1 A side perspective view of a seat belt device according to an embodiment of the present invention is schematically shown.

[0033] Figure 2 An end perspective view of a seat belt device according to an embodiment of the present invention is schematically shown.

[0034] Figure 3 Some components in a seat belt device according to an embodiment of the present invention are schematically shown.

[0035] Figure 4 Schematically shows a clutch device and an acceleration sensor in an engaged state in a seat belt device according to an embodiment of the present invention.

[0036] Figure 5 Schematically shows a clutch device in a seat belt device according to an embodiment of the present invention. Detailed implementation manners

[0037] The following will describe the detailed implementation manners of the seat belt device according to the present invention with reference to the accompanying drawings. The following detailed description and the drawings are used to exemplarily illustrate the principles of the present invention. The present invention is not limited to the described preferred embodiments. Each of the embodiments described in the present invention can be used alone or in any combination, and the protection scope of the present invention is defined by the claims.

[0038] In addition, spatially related terms (such as "upper", "lower", "left", and "right", etc.) are used to describe the relative positional relationship between elements shown in the drawings. Therefore, spatially related terms can be applied to directions different from those shown in the drawings when in use. Obviously, although for ease of description, all these spatially related terms refer to the directions shown in the drawings, those skilled in the art can understand that directions different from those shown in the drawings can be used.

[0039] Figure 1 Schematically shows a side perspective view of a seat belt device according to an embodiment of the present invention. Figure 2 Schematically shows an end face perspective view of a seat belt device according to an embodiment of the present invention. The following refers to Figure 1 and Figure 2 Describe a seat belt device according to an embodiment of the present invention.

[0040] As Figure 1 and Figure 2 shown, the present invention provides a seat belt device, which includes a seat belt retractor 1. The seat belt retractor 1 is to be installed on the backrest (not shown) of the seat and is used in cooperation with the seat belt to restrict the passenger to the seat, which can protect the passenger from being injured by hitting the vehicle interior components in the event of a collision, for example. The seat belt retractor 1 includes a core shaft 50, an acceleration sensor 10, an attitude controller 20, and a clutch device 30. The following will describe these components of the seat belt retractor 1 in detail.

[0041] Referring to Figure 2 , the core shaft 50 is used for winding a seat belt (not shown). When the core shaft 50 rotates in a first rotation direction, the seat belt is wound onto the core shaft 50; when the core shaft 50 rotates in a second rotation direction opposite to the first rotation direction, the seat belt is withdrawn from the core shaft 50. In Figure 2In the illustrated embodiment, the first rotation direction is the clockwise direction, and the second rotation direction is the counterclockwise direction. In one example, at one axial end of the mandrel 50, a retractor spring can be connected, and this retractor spring is used to apply a force to the mandrel 50 in the winding direction of the seat belt to cause the mandrel 50 to rotate. At the other axial end of the mandrel 50, as Figure 2 shown, an acceleration sensor 10, an attitude controller 20, and a clutch device 30 are provided. In this embodiment, as Figure 1 shown, the seat belt retractor 1 further includes an end cap 40, and the mandrel 50 is rotatably supported on the end cap 40 at one end. Moreover, the acceleration sensor 10, the attitude controller 20, and the clutch device 30 are all mounted on the end side of the end cap 40.

[0042] It should be noted that the acceleration sensor 10 of the seat belt retractor 1 is used to detect the acceleration of the vehicle in the front-rear direction, and, based on the detected acceleration, lock the rotation of the mandrel 50 and thus lock the extraction action of the seat belt, that is, lock the rotation of the mandrel 50 in the second rotation direction described above. The attitude controller 20 is used to keep the reference plane of the acceleration sensor 10 horizontal. Specifically, the attitude controller 20 is used to always keep the reference plane of the acceleration sensor 10 slightly horizontal regardless of how the tilt angle of the seat back changes. The clutch device 30 is connected to the mandrel 50 and activates the locking of the mandrel 50 by the acceleration sensor 10 under predetermined conditions. The acceleration sensor and the clutch device in the seat belt device of the present invention are described in detail below.

[0043] Figure 3 Schematically shows some components in the seat belt device according to an embodiment of the present invention. Figure 4 Schematically shows the clutch device and the acceleration sensor in the seat belt device according to an embodiment of the present invention in an engaged state. Figure 5 Schematically shows the clutch device in the seat belt device according to an embodiment of the present invention. The following refers to Figures 3 - 5 to further describe the specific structure of the seat belt device of the present invention.

[0044] As Figure 3 shown, the acceleration sensor 10 includes a mounting bracket 11 (see Figure 1 ), an inertia ball 12, and a base 13.

[0045] The mounting bracket 11 is generally a square frame, returning to Figure 1, the mounting bracket 11 can be fixedly provided on the end cap 40, which has a generally cylindrical main body portion and a downwardly extending lower extension portion. The mounting bracket 11 is fixed at the lower extension portion of the end cap 40. The main body portion of the end cap 40 can mount the above-mentioned mandrel 50 and the clutch device 30 to be described in detail below. Also, the inertia ball 12, the base 13 of the acceleration sensor 10, and a part (specifically, the lower part) of the clutch device 30 to be described below are accommodated in the inner space of the mounting bracket 11.

[0046] The inertia ball 12 is held on the support surface of the base 13, and this support surface is Figure 3 the upper side surface of the middle base 13, and this upper side surface is a concave surface. When the inertia ball 12 is subjected to an acceleration above a specified speed in the longitudinal direction of the vehicle (for example, when a collision occurs and the vehicle decelerates rapidly), it is displaced from the neutral position to detect the acceleration acting on the vehicle (i.e., the seat belt retractor 1). Moreover, the so-called support surface is in a slightly horizontal state under the action of the attitude controller 20, and slightly horizontal means that the reference plane of the support surface is in a generally horizontal direction.

[0047] The base 13 includes a rocking shaft 131 extending along the left-right direction of the vehicle. Correspondingly, holes for receiving the rocking shaft 131 are respectively provided on two opposite side surfaces of the mounting bracket 11. In this way, the base 13 is held in the mounting bracket 11 in a rotatable manner in the longitudinal direction of the vehicle via the rocking shaft 131. Specifically, the base 13 includes a bowl-shaped main body portion, and the inertia ball 12 is held on the upper side surface of the bowl-shaped main body portion. The rocking shaft 131 is provided at the edge of the bowl-shaped main body portion; the base 13 also includes two branch portions extending downward from the bowl-shaped main body portion, and these two branch portions are used to connect the attitude controller 20. As Figure 3 and Figure 4As shown, the attitude controller 20 can be configured as a counterweight and is connected below the base 13 in a pendulum manner. For example, the counterweight has a chamber, and a part of the base 13 is received in the chamber and maintains a predetermined distance from the inner wall of the chamber. It can be understood that setting the base 13 to be partially received in the chamber of the counterweight can reduce the space occupied by the acceleration sensor 10 and the attitude controller 20 in the height direction of the vehicle, thereby making the retractor 1 have a smaller volume. As an example of the connection method, through holes are provided on the side wall of the chamber of the counterweight, and protrusions are provided on the branched portion of the base 13. The protrusion of the base 13 is positioned in the through hole of the counterweight, so that the counterweight is connected below the base 13 in a snap connection manner. Of course, the connection method between the base and the counterweight is not limited to this. For another example, the counterweight can be connected to the lower side of the base via a rope. In this setting, the base can include a bowl-shaped main body portion without including a branched portion, and the counterweight can be directly connected to the lower side surface of the bowl-shaped main body portion. It can be understood that due to the action of gravity, the base that can freely swing tends to remain in the vertical position. In order to stabilize in this vertical position, a counterweight is added to the lower side of the base. Therefore, no matter what angle the vehicle and the seat back of the vehicle are in, the counterweight can drive the base 13 connected to it to swing along the front-rear direction of the vehicle to the vertical position at the swing axis 131. At this time, the reference plane of the base 13 is in a substantially horizontal position. When the backrest of the seat rotates backward, under the action of gravity, the attitude controller 20 drives the base 13 of the acceleration sensor 10 to rotate toward the rear side of the vehicle. When the backrest of the seat rotates forward, under the action of gravity, the attitude controller 20 drives the base 13 of the acceleration sensor 10 to rotate toward the front side of the vehicle. Even in a situation where the vehicle is, for example, on a slope and is tilted in the front-rear direction, resulting in the seat back being tilted in the front-rear direction, the attitude controller 20 can still drive the base 13 of the acceleration sensor 10 to swing in the front-rear direction of the vehicle until the base 13 is in a substantially horizontal position. Thus, in the front-rear direction of the vehicle, the support surface of the inertial ball serving as the reference plane is maintained in a slightly horizontal state.

[0048] As Figure 4 shown, the acceleration sensor 10 further includes an actuating member 14. In combination with Figure 2 , the actuating member 14 includes a first sensor lever 141 and a second sensor lever 142, and the actuating member 14 is linked to the movement of the inertial ball 12 in the front-rear direction of the vehicle, so that the retraction action of the seat belt is locked by the locking mechanism 60. The locking mechanism 60 of the seat belt retractor 1 includes a ratchet wheel 61 fixed on the core shaft 50 and a pawl 62 cooperating with the ratchet wheel 61. Specifically, referring to Figure 2, the second sensor lever 142 is rotatably fixed to the end cap 40, for example, and includes a contact portion (e.g., in the form of a gripper portion) at one end thereof that abuts against the first sensor lever 141 and another contact portion at the other end thereof that abuts against the locking mechanism 60, particularly the pawl 62. As one of the connection methods, a pair of convex arms with holes are provided at the edge of the bowl-shaped main body portion of the base 13 (see the front edge in Figure 3 ). The end of the first sensor lever 141 has studs protruding outward toward both sides. The studs on both sides of the first sensor lever 141 are inserted into the holes in the convex arms of the base 13, so that the first sensor lever 141 is rotatably connected to the edge of the base 13. Thus, the first sensor lever 141 is rotatably held on the base 13 in the longitudinal direction of the vehicle. When the inertial ball 12 moves away from the neutral position toward the periphery of the base, the inertial ball 12 contacts the first sensor lever 141 and applies an upward force to the first sensor lever 141. Under the action of this force, the first sensor lever 141 rotates upward relative to the base 13. Thus, the first sensor lever 141 is linked to the base 13 via the inertial ball 12. Moreover, the rotation of the first sensor lever 141 on the base 13 will cause the pawl 62 to cooperate with the ratchet 61. Specifically, when the first sensor lever 141 rotates upward relative to the base 13, it will cause the second sensor lever 142 to rotate at one end of the second sensor lever 142, so that the other end of the second sensor lever 142 actuates the pawl 61 to be positioned at the teeth of the ratchet 61. That is to say, when the horizontal acceleration received by the vehicle is greater than a specified value, the inertial ball 12 starts to displace as an inertial body from the neutral position; the first sensor lever 141 of the actuating member 14 is linked with it when the inertial ball 12 displaces in the longitudinal direction of the vehicle, and transmits this linkage to the pawl 62 of the locking mechanism 60 via the second sensor lever 142. Thus, the pawl 62 abuts against the tooth portion on the ratchet 61, so that the locking mechanism 60 acts on the side of locking the extraction movement of the seat belt to lock the rotation of the mandrel 50 in the extraction direction of the seat belt.

[0049] Of course, the above embodiments are merely examples. The first sensor lever 141 can also be rotatably held at other positions of the base 132 in the longitudinal direction of the vehicle, and any connection method that can be linked to the base 13 via the inertial ball 12 can be adopted.

[0050] Such as Figure 4 and Figure 5As shown, the clutch device 30 has a first engaging portion 31 and a second engaging portion 32. The first engaging portion 31 is torsionally connected to the core shaft 50. For example, the first engaging portion 31 is in interference fit with the end of the core shaft 50 to rotate together with the core shaft 50. And when the core shaft 50 rotates along the seat belt extraction direction under predetermined conditions, the first engaging portion 31 rotates together with the core shaft 50, thereby driving the second engaging portion 32 to move from a non-engaged state to an engaged state with the acceleration sensor 10. Specifically, for Figure 4 the shown clutch device 30, when the core shaft 50 rotates counterclockwise under predetermined conditions, the first engaging portion 31 of the clutch device 30 rotates counterclockwise together with the core shaft 50, thereby driving the second engaging portion 32 to rotate counterclockwise from a position away from the acceleration sensor 10 until Figure 4 the position shown in, that is to say, the second engaging portion 32 and the acceleration sensor 10 are converted from a non-engaged state to an engaged state, and this engaged state is as shown in Figure 4 shown.

[0051] As a kind of engaging manner, as shown in Figure 4 and Figure 5 shown, the second engaging portion 32 is configured as a leg portion having a bent end 321. Correspondingly, the acceleration sensor 10 further includes a relative engaging portion 15, which can be configured as a fan-shaped member and has teeth, and in the engaged state, the bent end 321 of the leg portion cooperates with the teeth of the relative engaging portion 15. As shown in Figure 3 shown, the relative engaging portion 15 is spaced apart from the first sensor lever 141 by a predetermined distance on the periphery of the base 13 and is fixed at the edge of the base 13. When the bent end 321 of the second engaging portion 32 of the clutch device 30 cooperates with the teeth of the relative engaging portion 15, the second engaging portion 32 is subject to a force that resists its further counterclockwise rotation due to the mutual abutment between the bent end 321 and the relative engaging portion 15. Therefore, the first engaging portion 31 and the core shaft 50 are also subject to a force that resists their further counterclockwise rotation. Thus, the clutch device 30 locks the rotation of the core shaft 50 along the seat belt extraction direction. Of course, the relative engaging portion of the acceleration sensor is not limited to the above form, and any structure that can abut against the second engaging portion to prevent its further rotation can be used, such as a stepped portion.

[0052] In one example, the second engaging portion 32 is formed by a strip-shaped member, and one end of the strip-shaped member is bent to form the bent end 321, and the other end is bent to form a bent portion 322. The bent end 321 and the bent portion 322 are spaced apart from each other by a certain distance to adapt to the distance between the core shaft 50 and the acceleration sensor 10. Of course, the manufacturing method of the second engaging portion described above is only an example, and the second engaging portion can also be manufactured in other ways, such as being formed by splicing multiple segments. And, asFigure 5 As shown, in order to provide a connection between the first engaging portion 31 and the second engaging portion 32, a groove 312 is provided at one end of the first engaging portion 31, and the bent portion 322 is connected to the groove 312 of the first engaging portion 31 in a snap-fit manner. It should be noted that since the connection between the first engaging portion 31 and the second engaging portion 32 is a snap-fit connection, if the force that causes the mandrel 50 to rotate counterclockwise is greater than the frictional force between the first engaging portion 31 and the second engaging portion 32, relative rotation will occur between the first engaging portion 31 and the second engaging portion 32. In this case, the bent end 321 of the second engaging portion 32 still cooperates with the relative engaging portion 15 and cannot rotate further counterclockwise. At the same time, the mandrel 50 and the first engaging portion 31 can rotate further counterclockwise. In other words, in the clutch device 30 of the present invention, the frictional force between the first engaging portion 31 and the second engaging portion 32 is much smaller than the force applied to the clutch device 30 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 30 when the seat belt is normally pulled out. Therefore, the clutch device 30 does not affect the pulling-out operation of the seat belt in normal use scenarios.

[0053] In addition, as Figure 1 shown, the bent end 321 of the second engaging portion 32 of the clutch device 30 is positioned inside the mounting bracket 11. That is to say, in addition to being used for mounting the acceleration sensor 10, the mounting bracket 11 also serves as a limiting member to limit the rotation of the second engaging portion 32 in the direction in which the mandrel 50 winds the seat belt, that is, Figure 4 the clockwise direction in

[0054] In addition, as Figure 5 shown, the first engaging portion 31 also has teeth 311 that engage with an external module; the external module is, for example, a child protection module, so as to complete the protection of the child safety seat together with the child protection module.

[0055] In addition, it should be noted that, as an example, the above-described predetermined conditions include the case where the acceleration of the vehicle exceeds a predetermined value, that is, the case of a sharp deceleration during a collision, and also include the case where the vehicle is in an inclined position in the front-rear direction, for example, when the vehicle is located on a slope. In the above two cases, the attitude controller can drive the base 13 of the acceleration sensor 10 to shake in the front-rear direction of the vehicle until the base 13 is in a substantially horizontal position. Thus, in the front-rear direction of the vehicle, the support surface of the inertial ball serving as the reference plane is maintained in a slightly horizontal state.

[0056] Moreover, on this basis, it can be understood that the seat belt device of the present invention is applicable to seats with a large adjustment angle range and various adjustment postures, including seats in which the seat cushion portion is designed to have a higher height, and seats in which the backrest portion is designed to have an inclination angle within a larger range relative to the seat cushion portion.

[0057] As described above, although the exemplary embodiments of the present invention have been described with reference to the accompanying drawings in the description, the present invention is not limited to the above specific embodiments, and the protection scope of the present invention should be defined by the claims and their equivalent meanings.

Claims

1. A seat belt device, comprising: A seat belt retractor (1) which is mounted on the backrest of a seat and includes A mandrel (50) around which a seat belt is wound; An acceleration sensor (10) for detecting the acceleration of the vehicle in the longitudinal direction and, based on the detected acceleration, locking the rotation of the mandrel (50) and thus locking the extraction action of the seat belt; An attitude controller (20) for keeping the reference plane of the acceleration sensor (10) horizontal; and A clutch device (30) which is connected to the mandrel (50) and activates the locking of the mandrel (50) by the acceleration sensor (10) under a predetermined condition; Characterized in that The acceleration sensor (10) includes a mounting bracket (11), an inertial ball (12) and a base (13), the base (13) includes a support surface for holding the inertial ball (12), the base (13) includes a rocking shaft (131) extending in the left - right direction of the vehicle and is held on the mounting bracket (11) via the rocking shaft (131) so as to be rotatable in the longitudinal direction; The attitude controller (20) is connected to the lower side of the base (13) and can swing freely to drive the base (13) of the acceleration sensor (10) to rock in the longitudinal direction via the rocking shaft (131); The clutch device (30) has a first engaging portion (31) and a second engaging portion (32), the first engaging portion (31) is torsion - resistant connected to the mandrel (50), and when the mandrel (50) rotates along the seat belt extraction direction under the predetermined condition, the first engaging portion (31) rotates together with the mandrel (50), thereby driving the second engaging portion (32) to move from a non - engaged state to an engaged state with the acceleration sensor (10), so as to lock the rotation of the mandrel (50) along the seat belt extraction direction.

2. The seat belt device according to claim 1, wherein, The attitude controller (20) is configured as a counterweight which has a chamber, and a part of the base (13) is received in the chamber and maintains a predetermined distance from the inner wall of the chamber.

3. The seat belt device according to claim 2, wherein, Through - holes are provided on the side wall of the chamber of the counterweight, and protrusions are provided on the lower side surface of the base (13), and the protrusions are positioned in the through - holes.

4. The seat belt device according to claim 1, wherein, The first engaging portion (31) of the clutch device (30) is in interference fit with the end of the mandrel (50), and the first engaging portion (31) further has teeth (311) meshing with an external module; And / or The second engaging portion (32) of the clutch device (30) is configured as a leg portion having a bent end (321), the acceleration sensor (10) further includes a relative engaging portion (15), and in the engaged state, the bent end (321) of the leg portion cooperates with the tooth portion of the relative engaging portion (15).

5. The seat belt device according to claim 4, wherein, The second engaging portion (32) is formed by a strip-shaped member, and has the bent end (321) and the bent portion (322) spaced apart therefrom, and the bent portion (322) is connected to the first engaging portion (31) in a snap-fitting manner.

6. The seat belt device according to claim 5, wherein, The acceleration sensor (10) further includes an actuating member, and the actuating member is linked to the movement of the inertial ball (12) in the front-rear direction, so that the retraction action of the seat belt is locked by the locking mechanism (60).

7. The seat belt device according to claim 6, wherein, The actuating member includes a first sensor lever (141), and the first sensor lever (141) is rotatably held on the base (13) in the front-rear direction and is linked to the base (13) via the inertial ball (12).

8. The seat belt device according to claim 7, wherein, The first sensor lever (141) is rotatably connected to the edge of the base (13), and the opposing engaging portion (15) is spaced apart from the first sensor lever (141) by a predetermined distance on the periphery of the base (13) and is fixed to the edge of the base (13).

9. The seat belt device according to claim 8, wherein, The mounting bracket (11) includes opposite first and second side portions, and support holes for supporting the rocking shaft (131) are respectively provided on the first and second side portions, and the bent end (321) of the second engaging portion (32) of the clutch device (30) is positioned inside the mounting bracket (11).

10. The seat belt device according to claim 9, wherein the mounting bracket (11) is provided on an end cap (40) for mounting the clutch device (30); and / or The locking mechanism (60) of the seat belt retractor (1) includes a ratchet wheel (61) fixed to the core shaft (50), and the rotation of the first sensor lever (141) on the base (13) actuates a pawl (62) to cooperate with the ratchet wheel (61).

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