Seat belt device

Abstract

A seat belt device, comprising a seat belt retractor (1) which is mounted on a backrest of a seat and comprises a spindle (50), an acceleration sensor (10), an attitude controller (20), and a clutch device (30). The clutch device is connected to the spindle and activates locking of the spindle by the acceleration sensor under a predetermined condition; the acceleration sensor comprises a mounting frame (11), an inertia ball (12), and a base (13); 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 a front-back direction by means of a swinging shaft (131); the clutch device has a first fitting portion (31) and a second fitting portion (32); the first fitting portion is connected to the spindle in a torsion-proof manner; and when the spindle rotates in a seat belt withdrawing direction under the predetermined condition, the first fitting portion rotates along with the spindle, so as to drive the second fitting portion to move to convert to an engaged state with the acceleration sensor from a non-engaged state, thereby locking the rotation of the spindle in the seat belt withdrawing direction. The seat belt device implements a large angle adjustment range and multiple adjustment attitudes of the backrest of the seat.

Description

Seat belt device Technical Field

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

[0002] Vehicle seatbelts are safety devices used to restrain occupants during a collision, preventing them from secondary collisions with the steering wheel, instrument panel, or other components, or from being ejected from the vehicle, resulting in death or injury. Vehicle seatbelts, also known as seat belts, are a type of occupant restraint. They are widely recognized as the cheapest and most effective safety device, and many countries mandate their inclusion in vehicles.

[0003] A seatbelt system consists of a seatbelt and a seatbelt retractor that winds the seatbelt. In situations such as a vehicle collision, if the vehicle experiences horizontal acceleration exceeding a specified value, the acceleration sensor detects this acceleration, triggering a locking mechanism that prevents the seatbelt from being withdrawn.

[0004] Nowadays, both the backrest and seat cushion of seats are movable to provide passengers with a more comfortable seating angle. Therefore, when installing a seatbelt retractor including the acceleration sensor on the seatback, it is necessary to adjust the seatbelt retractor's posture according to the backrest's tilt angle. This ensures that the acceleration sensor, after installation, is not affected by the seatback's movable backrest angle and accurately detects acceleration.

[0005] Considering that in self-driving cars, in order to provide seats with better comfort, the seats are designed in a way that is different from traditional vehicle seats. For example, the seat cushion part of the seat is designed to have a higher height. For another example, the seat backrest is designed to have a larger range of tilt angles relative to the seat cushion part, that is, the seat has a large adjustment angle range and multiple adjustment postures.

[0006] Therefore, a seat belt apparatus suitable for use in a seat having a large adjustment angle range and a variety of adjustment postures is desired.

[0007] Summary of the Invention

[0008] An object of the present invention is to provide a seat belt device suitable for use in a seat having a large adjustment angle range and multiple adjustment postures.

[0009] The present invention provides a safety belt device, comprising:

[0010] A seat belt retractor is mounted on the backrest of the seat and includes

[0011] a core shaft on which the safety belt is wound;

[0012] an acceleration sensor for detecting acceleration of the vehicle in a front-rear direction, and, based on the detected acceleration, locking the rotation of the spindle and thereby locking the withdrawal action of the seat belt;

[0013] a posture controller for keeping a reference surface of the acceleration sensor horizontal; and

[0014] a clutch device connected to the spindle and activating the acceleration sensor to lock the spindle under predetermined conditions;

[0015] in,

[0016] The acceleration sensor includes a mounting frame, an inertia ball, and a base, the base including a support surface for holding the inertia ball, the base including a swing axis extending in the left-right direction of the vehicle and being held on the mounting frame via the swing axis in a manner rotatable in the front-rear direction;

[0017] 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 swing in the front-back direction via the swing axis;

[0018] The clutch device has a first mating portion and a second mating portion, wherein the first mating portion is torsionally connected to the core shaft, and when the core shaft rotates along the seat belt withdrawal direction under the predetermined conditions, the first mating portion rotates together with the core shaft, thereby driving the second mating portion to move to convert from a non-engaged state to an engaged state with the acceleration sensor, thereby locking the rotation of the core shaft along the seat belt withdrawal direction.

[0019] According to an embodiment of the present invention, the posture controller is configured as a counterweight having a cavity, and a portion of the base is accommodated in the cavity and maintains a predetermined distance from an inner wall of the cavity.

[0020] According to an embodiment of the present invention, a through hole is provided on the side wall of the cavity of the counterweight block, and a protrusion is provided on the lower side of the base, and the protrusion is positioned in the through hole.

[0021] According to an embodiment of the present invention, the first mating portion of the clutch device is interference-fitted with the end of the core shaft, and the first mating portion further comprises teeth for engaging with an external module;

[0022] and / or,

[0023] The second matching portion of the clutch device is configured as a leg portion having a bent end. The acceleration sensor further comprises a relative matching portion. In the engaged state, the bent end of the leg portion matches with the tooth portion of the relative matching portion.

[0024] According to an embodiment of the present invention, the second matching portion is formed by a strip and has the bent end and a bent portion spaced apart therefrom, and the bent portion is connected to the first matching portion in a snap-fit ​​manner.

[0025] According to an embodiment of the present invention, the acceleration sensor further includes an action member, and the action member is linked with the movement of the inertia ball in the front-rear direction, so that the withdrawal action of the seat belt is locked by a locking mechanism.

[0026] According to an embodiment of the present invention, the actuating member includes a first sensor lever that is rotatably held on the base in the front-rear direction and is linked to the base via the inertia ball.

[0027] According to an embodiment of the present invention, the first sensor lever is rotatably connected to an edge of the base, and the opposing fitting portion is spaced a predetermined distance from the first sensor lever on a periphery of the base and fixed to the edge of the base.

[0028] According to an embodiment of the present invention, the mounting frame includes a first side portion and a second side portion relative to each other, and the first side portion and the second side portion are respectively provided with support holes for supporting the rocking shaft, and the bent end of the second mating portion of the clutch device is positioned on the inner side of the mounting frame.

[0029] According to an embodiment of the present invention, the mounting bracket is provided on an end cover for mounting the clutch device;

[0030] and / or,

[0031] The locking mechanism of the seat belt retractor includes a ratchet wheel fixed on the core shaft, and the rotation-actuated pawl of the first sensor lever on the base cooperates with the ratchet wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The features, advantages and technical effects of the exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the accompanying drawings, the same symbols indicate the same elements, wherein:

[0033] FIG1 schematically shows a side perspective view of a seat belt device according to an embodiment of the present invention.

[0034] FIG2 schematically shows an end perspective view of a seat belt device according to an embodiment of the present invention.

[0035] FIG3 schematically shows some components of a seat belt device according to an embodiment of the present invention.

[0036] FIG4 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.

[0037] FIG5 schematically shows a clutch device in a seat belt device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Specific embodiments of a seat belt device according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and accompanying drawings are intended to illustrate the principles of the present invention. The present invention is not limited to the preferred embodiments described herein. The various embodiments described herein may be used individually or in any combination. The scope of protection of the present invention is defined by the claims.

[0039] In addition, spatially relative terms (such as "upper," "lower," "left," and "right") are used to describe the relative positional relationship of an element shown in the drawings to another element. Therefore, the spatially relative terms can be applied to orientations different from those shown in the drawings when used. Obviously, although all of these spatially relative terms refer to the orientations shown in the drawings for ease of description, those skilled in the art will understand that orientations different from those shown in the drawings can be used.

[0040] 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 perspective view of a seat belt device according to an embodiment of the present invention. The seat belt device according to an embodiment of the present invention will be described below with reference to Figures 1 and 2.

[0041] As shown in Figures 1 and 2, the present invention provides a seatbelt device including a seatbelt retractor 1. The seatbelt retractor 1 is mounted on a seatback (not shown) and works in conjunction with a seatbelt to restrain a passenger in the seat. This protects the passenger from collisions and injuries caused by collisions with interior components, such as in the event of a collision. The seatbelt retractor 1 includes a spindle 50, an acceleration sensor 10, a posture controller 20, and a clutch device 30. These components of the seatbelt retractor 1 are described in detail below.

[0042] Referring to Figure 2 , a spindle 50 is used to wind a seatbelt (not shown). When the spindle 50 rotates in a first rotational direction, the seatbelt is wound onto the spindle 50. When the spindle 50 rotates in a second rotational direction opposite the first rotational direction, the seatbelt is withdrawn from the spindle 50. In the embodiment shown in Figure 2 , the first rotational direction is clockwise, and the second rotational direction is counterclockwise. In one example, a retractor spring may be connected to one axial end of the spindle 50, which applies a force to the spindle 50 in the seatbelt winding direction to rotate the spindle 50. As shown in Figure 2 , an acceleration sensor 10, a posture controller 20, and a clutch device 30 are disposed at the other axial end of the spindle 50. In this embodiment, as shown in Figure 1 , the seatbelt retractor 1 further includes an end cap 40 on which the spindle 50 is rotatably supported at one end. Furthermore, the acceleration sensor 10, the posture controller 20, and the clutch device 30 are all mounted on the end side of the end cap 40.

[0043] It should be noted that the acceleration sensor 10 of the seatbelt retractor 1 is used to detect the acceleration of the vehicle in the front-to-back direction, and, based on the detected acceleration, to lock the rotation of the core shaft 50 and thereby lock the withdrawal action of the seatbelt, that is, to lock the rotation of the core shaft 50 in the second rotation direction described above. The posture controller 20 is used to keep the reference plane of the acceleration sensor 10 horizontal. Specifically, the posture controller 20 is used to always keep the reference plane of the acceleration sensor 10 slightly horizontal regardless of how the inclination angle of the seat back changes. The clutch device 30 is connected to the core shaft 50 and activates the locking of the core shaft 50 by the acceleration sensor 10 under predetermined conditions. The acceleration sensor and clutch device in the seatbelt device of the present invention are described in detail below.

[0044] FIG3 schematically illustrates some components of a seat belt device according to an embodiment of the present invention. FIG4 schematically illustrates a clutch device and an acceleration sensor in an engaged state in a seat belt device according to an embodiment of the present invention. FIG5 schematically illustrates a clutch device in a seat belt device according to an embodiment of the present invention. The specific structure of the seat belt device according to the present invention will be further described below with reference to FIG3-5.

[0045] As shown in FIG3 , the acceleration sensor 10 includes a mounting bracket 11 (see FIG1 ), an inertia ball 12 and a base 13 .

[0046] The mounting frame 11 is a generally square frame. Returning to Figure 1 , the mounting frame 11 can be fixedly mounted on the end cap 40. This end cap 40 has a generally cylindrical main body and a lower extension extending downward from the main body. The mounting frame 11 is fixed to the lower extension of the end cap 40. The main body of the end cap 40 can be mounted with the aforementioned core shaft 50 and the clutch device 30, which will be described in detail below. Furthermore, the inertia ball 12 and base 13 of the acceleration sensor 10, as well as a portion (specifically, the lower portion) of the clutch device 30, which will be described below, are accommodated within the inner space of the mounting frame 11.

[0047] The inertia ball 12 is held on a support surface of the base 13, which is the concave upper surface of the base 13 in Figure 3. When the vehicle experiences acceleration exceeding a predetermined velocity in the fore-aft direction (e.g., during a collision and sudden deceleration), the inertia ball 12 shifts from its neutral position to detect the acceleration acting on the vehicle (i.e., the seatbelt retractor 1). Furthermore, the support surface is maintained in a substantially horizontal state by the posture controller 20. This refers to a substantially horizontal reference plane.

[0048] The base 13 includes a pivot shaft 131 extending in the left-right direction of the vehicle. Correspondingly, holes for receiving the pivot shafts 131 are provided on two opposing sides of the mounting frame 11. This allows the base 13 to be rotatably retained in the mounting frame 11 in the fore-and-aft direction of the vehicle via the pivot shafts 131. Specifically, the base 13 includes a bowl-shaped main body, with the inertia ball 12 retained on its upper surface. The pivot shafts 131 are positioned at the edge of the bowl-shaped main body. The base 13 also includes two branches extending downward from the bowl-shaped main body for connection to the posture controller 20. As shown in Figures 3 and 4, the posture controller 20 can be configured as a counterweight and attached to the bottom of the base 13 in a pendulum-like manner. For example, the counterweight has a cavity, and a portion of the base 13 is housed within the cavity, maintaining a predetermined distance from the inner wall of the cavity. It can be understood that the base 13 is arranged to be partially accommodated in the cavity of the counterweight, which can reduce the space occupied by the acceleration sensor 10 and the posture controller 20 in the height direction of the vehicle, thereby making the safety retractor 1 have a smaller volume. As an example of a connection method, a through hole is provided on the side wall of the cavity of the counterweight, and a protrusion is provided on the branch 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 to the bottom of the base 13 in a snap-fit ​​manner. 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. In this arrangement, the base can include a bowl-shaped main body without a branch portion, and the counterweight can be directly connected to the lower side of the bowl-shaped main body. It can be understood that due to the effect of gravity, the base that can swing freely tends to remain in a vertical position, and in order to stabilize the vertical position, a counterweight block is added to the lower side of the base. Therefore, no matter what angle the vehicle and the seat back of the vehicle are at, the counterweight block can drive the base 13 connected to it to swing to a vertical position along the front and rear direction of the vehicle at the swing axis 131. At this time, the reference surface of the base 13 is in a basically horizontal position. When the seat backrest tilts backward, the posture controller 20 drives the base 13 of the acceleration sensor 10 to rotate toward the rear side of the vehicle under the action of gravity. When the seat backrest rotates forward, the posture controller 20 drives the base 13 of the acceleration sensor 10 to rotate toward the front side of the vehicle under the action of gravity. Even in a situation where the vehicle is tilted in the front-to-back direction, such as on a slope, which causes the seat backrest to tilt in the front-to-back direction, the posture controller 20 can still drive the base 13 of the acceleration sensor 10 to shake in the front-to-back direction of the vehicle until the base 13 is in a basically horizontal position, thereby keeping the support surface of the inertia ball serving as a reference plane in a slightly horizontal state in the front-to-back direction of the vehicle.

[0049] As shown in FIG4 , the acceleration sensor 10 further includes an actuating member 14. In conjunction with FIG2 , the actuating member 14 includes a first sensor lever 141 and a second sensor lever 142. The actuating member 14 is linked to the movement of the inertia ball 12 in the front-to-rear direction of the vehicle, so that the seatbelt withdrawal action is locked by a locking mechanism 60. The locking mechanism 60 of the seatbelt retractor 1 includes a ratchet 61 fixed to the spindle 50 and a pawl 62 engaged with the ratchet 61. Specifically, referring to FIG2 , the second sensor lever 142 is, for example, rotatably fixed to the end cap 40 and includes an abutment portion (e.g., in the form of a grip portion) at one end thereof that abuts the first sensor lever 141, and another abutment portion at the other end thereof that abuts the locking mechanism 60, particularly the pawl 62. As one connection method, a pair of protruding arms with holes are provided at the edge of the bowl-shaped main body of the base 13 (see the front edge in FIG3 ). The end of the first sensor lever 141 has protruding posts protruding outward on both sides. The protruding posts on both sides of the first sensor lever 141 are inserted into the holes in the protruding arms of the base 13, so that the first sensor lever 141 is rotatably connected to the edge of the base 13. As a result, the first sensor lever 141 is rotatably retained on the base 13 in the fore-and-aft direction of the vehicle. When the inertia ball 12 moves from its neutral position toward the periphery of the base, the inertia 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, thereby interlocking with the base 13 via the inertia ball 12. Furthermore, the rotation of the first sensor lever 141 on the base 13 actuates the pawl 62 to engage with the ratchet 61. Specifically, when the first sensor lever 141 rotates upward relative to the base 13, it actuates the second sensor lever 142 at one end to rotate, thereby actuating the other end of the second sensor lever 142 to position the pawl 61 against the teeth of the ratchet 61. In other words, when the horizontal acceleration to which the vehicle is subjected exceeds a specified value, the inertia ball 12 begins to shift from its neutral position as an inertial body. The first sensor lever 141 of the actuating member 14 interlocks with the inertia ball 12 as it shifts in the vehicle's front-to-rear direction, and transmits this interlocking motion to the pawl 62 of the locking mechanism 60 via the second sensor lever 142. As a result, the pawl 62 abuts against the teeth of the ratchet 61, causing the locking mechanism 60 to actuate toward the side that locks the seatbelt withdrawal action, thereby locking the spindle 50 from rotating in the seatbelt withdrawal direction.

[0050] Of course, the above embodiments are merely examples, and the first sensor lever 141 may also be rotatably maintained at other positions of the base 132 in the front-rear direction of the vehicle, and any connection method that can be linked to the base 13 via the inertia ball 12 may be adopted.

[0051] As shown in Figures 4 and 5, the clutch device 30 includes a first mating portion 31 and a second mating portion 32. The first mating portion 31 is torque-proofly connected to the core shaft 50. For example, the first mating portion 31 forms an interference fit with the end of the core shaft 50, allowing it to rotate together with the core shaft 50. Furthermore, when the core shaft 50 rotates in the seatbelt withdrawal direction under predetermined conditions, the first mating portion 31 rotates along with the core shaft 50, thereby driving the second mating portion 32 to move from a non-engaged state to an engaged state with the acceleration sensor 10. Specifically, for the clutch device 30 shown in Figure 4, when the core shaft 50 rotates counterclockwise under predetermined conditions, the first mating portion 31 of the clutch device 30 rotates counterclockwise along with the core shaft 50, thereby driving the second mating portion 32 to rotate counterclockwise from a position away from the acceleration sensor 10 to the position shown in Figure 4. In other words, the second mating portion 32 transitions from a non-engaged state to an engaged state with the acceleration sensor 10, as shown in Figure 4.

[0052] As one engagement mechanism, as shown in Figures 4 and 5 , the second engaging portion 32 is configured as a leg portion having a bent end 321. Accordingly, the acceleration sensor 10 further includes a counter-engaging portion 15, which can be configured as a fan-shaped member and have teeth. In the engaged state, the bent end 321 of the leg portion engages with the teeth of the counter-engaging portion 15. As shown in Figure 3 , the counter-engaging portion 15 is spaced a predetermined distance from the first sensor lever 141 on the periphery of the base 13 and is fixed to the edge of the base 13. When the bent end 321 of the second engaging portion 32 of the clutch device 30 engages with the teeth of the counter-engaging portion 15, the second engaging portion 32 abuts against the counter-engaging portion 15 at the bent end 321, thereby inhibiting further counterclockwise rotation of the second engaging portion 32. Consequently, the first engaging portion 31 and the spindle 50 are similarly inhibited from further counterclockwise rotation, thereby locking the spindle 50 from rotating in the direction of belt withdrawal. Of course, the relative matching portion of the acceleration sensor is not limited to the above-mentioned form, and any structure that can abut against the second matching portion to prevent further rotation thereof can be used, for example, a step portion.

[0053] In one example, the second mating portion 32 is formed by a strip, and one end of the strip is bent to form a 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 by a certain distance to accommodate the distance between the core shaft 50 and the acceleration sensor 10. Of course, the manufacturing method of the second mating portion described above is merely an example, and other methods can also be used to manufacture the second mating portion, such as by splicing multiple segments to form the second mating portion. In addition, as shown in Figure 5, in order to provide a connection between the first mating portion 31 and the second mating portion 32, a groove 312 is provided on one end of the first mating portion 31, and the bent portion 322 is connected to the groove 312 of the first mating portion 31 in a snap-fit ​​manner. It should be noted that, because the first engaging portion 31 and the second engaging portion 32 are connected by a snap-fit ​​connection, if the force causing the core shaft 50 to rotate counterclockwise is greater than the friction 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 remains engaged with the relative engaging portion 15 and cannot rotate further counterclockwise. At the same time, the core shaft 50 and the first engaging portion 31 can rotate further counterclockwise. In other words, in the clutch device 30 of the present invention, the friction between the first engaging portion 31 and the second engaging portion 32 is much smaller than the force applied to the clutch device 30 during normal seat belt withdrawal. For example, the friction is set to 10% of the force applied to the clutch device 30 during normal seat belt withdrawal. Therefore, the clutch device 30 does not affect the withdrawal of the seat belt in normal use.

[0054] Furthermore, as shown in Figure 1 , the bent end 321 of the second mating portion 32 of the clutch device 30 is positioned inside the mounting bracket 11. In other words, in addition to being used to mount the acceleration sensor 10, the mounting bracket 11 also serves as a stopper, restricting the second mating portion 32 from rotating in the direction of the core shaft 50 along the seatbelt winding direction, i.e., clockwise in Figure 4 , to prevent the second mating portion 32 from interfering with the operation of other components.

[0055] In addition, as shown in FIG5 , the first matching portion 31 further has teeth 311 that engage with an external module; the external module is, for example, a child protection module, thereby completing the protection of the child safety seat together with the child protection module.

[0056] Furthermore, it should be noted that the predetermined conditions described above include, by way of example, situations where the vehicle's acceleration exceeds a predetermined value, i.e., a sudden deceleration due to a collision, and situations where the vehicle is tilted in the fore-and-aft direction, such as on a slope. In both of these situations, the attitude controller can cause the base 13 of the acceleration sensor 10 to swing in the fore-and-aft direction of the vehicle until the base 13 is substantially horizontal, thereby maintaining the support surface of the inertia ball, serving as a reference surface, in a slightly horizontal state in the fore-and-aft direction of the vehicle.

[0057] Moreover, on this basis, it can be understood that the seat belt device of the present invention is suitable for seats with a large adjustment angle range and multiple adjustment postures, including seats with a seat cushion designed to have a higher height, and seats with a backrest designed to have a larger range of tilt angles relative to the seat cushion.

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

Claims

1. A seat belt device, comprising: A seat belt retractor (1), which is installed on the backrest of the seat and includes A mandrel (50) around which the seat belt is wound; An acceleration sensor (10) for detecting the acceleration of the vehicle in the front - rear 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 inertia ball (12) and a base (13). The base (13) includes a support surface for holding the inertia ball (12). The base (13) includes a rocking shaft (131) extending along the left - right direction of the vehicle and is held on the mounting bracket (11) in a rotatable manner in the front - rear direction via the rocking shaft (131); 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 front - rear 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). 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. 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.

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). 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) also 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 with a bent end (321). The acceleration sensor (10) further includes a relative engaging portion (15). 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 that is linked to the movement of the inertial ball (12) in the front-rear direction, such 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) that 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 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 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 mandrel (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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