Safety belt retractor

Abstract

A seat belt retractor (100) includes: a retractor frame (10); the rotating shaft (20) is rotatably mounted in the retractor frame; the positioning rod seat (30) is arranged outside the retractor frame and is linked with the rotating shaft, and a clamping part (31) is arranged at the axial outer end of the positioning rod seat; the steel ball seat (40) is pivoted outside the retractor frame, and the steel ball seat is provided with a fan-shaped positioning gear (41); the positioning rod (50) comprises a first end (51) and a second end (52), the first end is in linkage with the clamping part of the positioning rod seat, the second end is used for being clamped with or separated from the fan-shaped positioning gear of the steel ball seat, the first end is provided with a clamping ring (511), the clamping part is provided with a clamping groove (311), and when the clamping ring is sleeved with the clamping part, the clamping part elastically deforms in the radial direction, and the clamping ring is clamped into the clamping groove (311). And the clamping ring is clamped and embedded in the clamping groove and is in interference fit with the clamping groove.

Description

Seat belt retractor Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a seat belt retractor. Background Art

[0002] With the continuous development of my country's automobile market and the increasing popularity of automobiles, automobile safety performance has become an important factor for consumers to consider when purchasing a car. Automobile manufacturers are also paying more and more attention to automobile safety issues. Automobile seat belts are devices used in cars to ensure that passengers and drivers are protected from injury when the car body is hit violently, playing a role in restraining displacement and buffering.

[0003] Usually, seat belts are installed on the front and rear seats of a car. When in use, the seat belt is pulled out from the seat belt retractor, passed through the seat belt guide plate (or seat belt outlet), and the plug on the seat belt is inserted into the buckle on the seat (or next to the seat) to fasten the passenger to the car seat.

[0004] In the related art, the tilt locking mechanism of the seat belt retractor in the seat is fixed, and a ball is arranged inside. When the angle of the ball changes, the ratchet pops out. After the ratchet cooperates with the ratchet, when the vehicle tilts, or when the backrest is adjusted forward and backward and tilted to a certain angle, the tilt locking function will be triggered, causing the seat belt retractor to be unable to release the seat belt smoothly, or when the backrest is fully tilted forward, the seat belt cannot be pulled out and the backrest cannot be returned to its original position. The lock must be unlocked before it can be returned to its original position. Therefore, it is only suitable for a small range of adjustment of the movable backrest.

[0005] Summary of the Invention

[0006] In order to overcome the problems existing in the related art, the present disclosure provides a seat belt retractor.

[0007] According to the first aspect of the embodiment of the present disclosure, the present disclosure provides a seat belt retractor, comprising: a retractor frame; a rotating shaft, rotatably installed in the retractor frame; a positioning rod seat, arranged on the outside of the retractor frame and linked with the rotating shaft, the axial outer end of the positioning rod seat is provided with a clamping portion; a steel ball seat, pivotally connected to the outside of the retractor frame, the steel ball seat is provided with a fan-shaped positioning gear; a positioning rod, comprising a first end and a second end, the first end is linked with the clamping portion of the positioning rod seat, and the second end is used to clamp or separate with the fan-shaped positioning gear of the steel ball seat, wherein the first end is provided with a clamping ring, the clamping portion is provided with a clamping slot, the clamping ring is embedded in the clamping slot and interference fits with the clamping slot.

[0008] In some embodiments, the snap ring is a closed ring. When the snap ring is axially inserted into the snap portion, the snap portion undergoes elastic deformation in the radial direction, so that the snap ring is snapped into the slot.

[0009] In some embodiments, the snap ring is a non-closed ring with an opening, and the opening enables the snap ring to be radially snapped into the slot.

[0010] In some embodiments, the clamping portion includes a first flange and a second flange axially spaced apart, and the clamping groove is formed between the first flange and the second flange; wherein, the first flange extends toward the axial inner end at the radial edge to form a hook portion, and the second flange extends toward the axial outer end at the radial edge to form a support portion, and the distance between the hook portion and the support portion in the axial direction is less than the thickness of the clamping ring.

[0011] In some embodiments, a plurality of the first flanges are provided and are evenly arranged at equal intervals along the circumference; and / or a plurality of the second flanges are provided and are evenly arranged at equal intervals along the circumference.

[0012] In some embodiments, the plurality of first flanges and the plurality of second flanges are staggered in the axial direction.

[0013] In some embodiments, the clamping portion is provided with a spacing groove between the two first flanges, and the spacing groove extends axially from the first flange to the clamping groove.

[0014] In some embodiments, the outer surface of the first flange is provided with a first inclined surface; and / or the outer surface of the second flange is provided with a second inclined surface.

[0015] In some embodiments, a gear is further provided at the axial inner end of the positioning rod seat, the gear and the clamping portion are integrally formed, and the gear is linked to the rotating shaft.

[0016] In some embodiments, the positioning rod seat is made of plastic.

[0017] In some embodiments, the positioning rod is made of metal material.

[0018] In some embodiments, the seat belt retractor further includes: a locking disk, which is arranged on the outside of the retractor frame and linked to the rotating shaft, and the outer periphery of the locking disk is provided with external teeth; the steel ball seat also includes: a rocker arm assembly, which is pivotally connected to the steel ball seat, and the rocker arm assembly is provided with a pawl, and a steel ball is located in the arc groove of the steel ball seat and the rocker arm assembly; wherein, when the vehicle tilts, the steel ball hits the rocker arm assembly according to inertia, causing the rocker arm assembly to rotate relative to the steel ball seat, and causing the pawl to engage with the external teeth to limit the rotation of the rotating shaft relative to the retractor frame.

[0019] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the clamping portion of the positioning rod seat undergoes elastic deformation in the radial direction, so that the clamping ring of the positioning rod is embedded in the clamping groove of the clamping portion and interference fits in the clamping groove. While ensuring the connection strength between the positioning rod and the positioning rod seat, not only the number of components that need to be assembled and the space occupied are reduced, but also the assembly process is simplified and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0021] FIG1 is a side view of a seat belt retractor according to an exemplary embodiment;

[0022] FIG2 is a cross-sectional view of FIG1 at AA;

[0023] 3 is an exploded view of the assembly of the positioning rod seat and the positioning rod of the first embodiment;

[0024] FIG4 is a perspective diagram of the assembly of the positioning rod seat and the positioning rod of the first embodiment;

[0025] FIG5 is a schematic diagram of the three-dimensional structure of the positioning rod of the second embodiment;

[0026] FIG6 is an enlarged schematic diagram of the second end of the positioning rod of the second embodiment;

[0027] 7 is a partial structural perspective diagram of a seat belt retractor according to a second embodiment;

[0028] FIG8 is a perspective schematic diagram of the assembly location of the positioning rod seat and the positioning rod in FIG7 . DETAILED DESCRIPTION

[0029] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0030] In the present invention, unless otherwise specified, the terms "axial," "radial," and "circumferential" refer to the axial, radial, and circumferential directions of the seatbelt retractor, respectively; the axially inner end refers to the lower side in Figure 2 , and the axially outer end refers to the upper side in Figure 2 ; the radially outer end refers to the side radially away from the center axis O in Figure 2 , and the radially inner end refers to the side radially closer to the center axis O. Furthermore, "linkage" refers to the ability to transmit driving force / torque between two components, which can be achieved by direct connection or through various transmission mechanisms or connection structures.

[0031] To solve the above technical problems, the present disclosure provides a seat belt retractor 100, comprising: a retractor frame 10, a rotating shaft 20, a positioning rod seat 30, a steel ball seat 40, a positioning rod 50, a steel ball and a locking disk.

[0032] The rotating shaft 20 is rotatably mounted in the retractor frame 10 . The rotating shaft 20 is used for winding the seat belt. When the seat belt is pulled out of the retractor frame 10 or retracted into the retractor frame 10 , the seat belt drives the rotating shaft 20 to rotate.

[0033] A locking disc is externally mounted on one axial end of the retractor frame 10. This disc is located externally of the retractor frame 10 and is linked to the rotating shaft 20. External teeth are disposed on the outer circumference of the locking disc. "Linkage" refers to the ability to transmit driving force / torque between two components. These components can be directly connected or through various transmission mechanisms or connection structures to achieve this.

[0034] Furthermore, the steel ball seat 40 is pivotally connected to the outside of the retractor frame 10 via a pivot shaft and rotates relative to the retractor frame 10 and is located on the same side as the locking plate. The steel ball seat 40 includes a rocker assembly and a steel ball (not shown).

[0035] One end of the rocker assembly is pivotally connected to the steel ball seat 40. A pawl is located at the other end of the rocker assembly, and the steel ball is positioned within the arcuate groove between the steel ball seat 40 and the rocker assembly. When the vehicle tilts, the steel ball, due to inertia, strikes the rocker assembly, causing one end of the rocker assembly to rotate relative to the steel ball seat 40. This in turn drives the pawl at the other end of the rocker assembly to swing and engage the outer teeth of the locking plate, stopping the locking plate from rotating. Because the locking plate is linked to the rotating shaft 20, it restricts the rotating shaft 20 from rotating relative to the retractor frame 10, thereby locking the seatbelt from being withdrawn.

[0036] As shown in Figures 1, 2 and 7, the positioning rod seat 30 is arranged outside the retractor frame 10 and is linked to the rotating shaft 20. A clamping portion 31 is provided at the axial outer end of the positioning rod seat 30, and a gear 32 is provided at the axial inner end of the positioning rod seat 30. The gear 32 can be integrally formed with the clamping portion 31, and the gear 32 is linked to the rotating shaft 20. Therefore, the rotating shaft 20 can drive the rotation of the positioning rod seat 30 through the gear 32, thereby realizing the linkage between the positioning rod seat 30 and the rotating shaft 20.

[0037] This disclosure exemplifies two embodiments, a first embodiment shown in Figures 1 to 4 and a second embodiment shown in Figures 5 to 8 . In both the first and second embodiments, a sector-shaped positioning gear 41 is provided extending from the steel ball seat 40. A positioning rod 50 includes a first end 51 and a second end 52 . The first end 51 is coupled to the engaging portion 31 of the positioning rod seat 30 , while the second end 52 is configured to engage with or disengage the sector-shaped positioning gear 41 of the steel ball seat 40 .

[0038] In the first embodiment, as shown in Figure 3, the first end 51 of the positioning rod 50 is provided with an annular and annularly closed snap ring 511, and the snap portion 31 of the positioning rod seat 30 is provided with an annular snap groove 311 arranged along the circumferential direction. The inner diameter of the snap ring 511 is smaller than the minimum outer diameter of the snap portion 31. Therefore, when the snap ring 511 is inserted into the snap portion 31, the snap portion 31 needs to undergo elastic deformation in the radial direction so that the snap ring 511 can be embedded in the snap groove 311 and interference fit with the snap groove 311.

[0039] In this way, the rotating shaft 20 drives the clamping portion 31 of the positioning rod seat 30 to rotate through the gear 32 of the positioning rod seat 30, and the clamping portion 31 is interference fit with the clamping ring 511, so that the positioning rod 50 can rotate with the rotation direction of the rotating shaft 20 (including clockwise and counterclockwise) to achieve the clamping or separation of the second end 52 of the positioning rod 50 and the fan-shaped positioning gear 41.

[0040] When the safety belt body is pulled out, the safety belt body drives the shaft 20 to rotate counterclockwise, and the counterclockwise rotation of the shaft 20 drives the positioning rod 50 to rotate counterclockwise, so that the second end 52 of the positioning rod 50 is stuck in the sector-shaped positioning gear 41 to fix the steel ball seat 40.

[0041] When the seat belt body retracts, it drives the rotating shaft 20 to rotate clockwise. This clockwise rotation of the rotating shaft 20 drives the positioning rod 50 to rotate clockwise, causing the second end 52 of the positioning rod 50 to move away from the sector-shaped positioning gear 41 until the positioning rod 50 reaches a stop post (not shown). After the positioning rod 50 stops, if the rotating shaft 20 continues to rotate, the first end 51 of the positioning rod 50 and the engaging groove 311 of the engaging portion 31 of the positioning rod seat 30 will slip, keeping the positioning rod 50 in place.

[0042] The clamping portion 31 can undergo elastic deformation in the radial direction R. Firstly, after the clamping ring 511 of the positioning rod 50 is clamped into the clamping groove 311, the clamping portion 31 rebounds, which can effectively prevent the clamping ring 511 from slipping out of the clamping groove 311. Secondly, the clamping portion 31 is elastically deformed in the radial direction R, which can simultaneously reduce the radial R dimensions of the clamping ring 511 of the positioning rod 50 and the clamping portion 31 of the positioning rod seat 30, thereby reducing the space occupied by the clamping portion 31 and the clamping ring 511 to avoid interference with other components. Thirdly, on the basis of ensuring the preload force, the positioning rod 50 and the positioning rod seat 30 are directly connected by means of sleeves, which is convenient for assembly and saves parts and costs.

[0043] In some embodiments, the positioning rod seat 30 is made of plastic. In some embodiments, the positioning rod 50 is made of metal. The positioning rod 50 made of metal is strong, which prevents the second end 52 of the positioning rod 50 from breaking and failing during the engagement process with the sector-shaped positioning gear 41.

[0044] Furthermore, as shown in FIG. 2 to FIG. 4 , the clamping portion 31 of the positioning rod seat 30 includes a first flange 312 and a second flange 313 spaced apart in the axial direction A, and the above-mentioned clamping groove 311 is formed between the first flange 312 and the second flange 313 .

[0045] Among them, the first flange 312 extends along the axial inner end at the radial R edge to form a hook portion 314, and the second flange 313 extends along the axial outer end at the radial R edge to form a support portion 315. The distance between the hook portion 314 and the support portion 315 in the axial direction A is less than the thickness of the clamping ring 511.

[0046] In this way, when the snap ring 511 of the positioning rod 50 of the first embodiment is clamped into the clamping groove 311, the hook portion 314 and the support portion 315 can clamp the snap ring 511 in the axial direction A to limit the movement of the snap ring 511 in the axial direction A and increase the pre-tightening force between the clamping portion 31 and the snap ring 511. At the same time, it can be seen from the above content that the snap ring 511 and the clamping groove 311 have an interference fit, which cooperates with the pre-tightening force of the clamping portion 31 and the snap ring 511, so that the snap ring 511 of the positioning rod 50 and the clamping portion 31 of the positioning rod seat 30 are clamped more firmly, avoiding slipping and failure.

[0047] Furthermore, multiple first flanges 312 are provided and are evenly arranged at equal intervals along the circumferential direction W; and / or multiple second flanges 313 are provided and are evenly arranged at equal intervals along the circumferential direction W, and the multiple first flanges 312 and the multiple second flanges 313 are staggered in the axial direction A, that is, a second flange 313 is provided between two first flanges 312, or a first flange 312 is provided between two second flanges 313.

[0048] The first flange 312 and the second flange 313 are arranged at equal intervals in the circumferential direction W, and the number of the first flange 312 is the same as the number of the second flange 313. In this way, the first flange 312 and the second flange 313 exert the same pre-tightening force on both sides of the clamping ring 511, thereby preventing the clamping ring 511 from bending and deforming due to uneven force.

[0049] In the embodiment of the present disclosure, as shown in FIG. 2 to FIG. 4 , two first flanges 312 are provided, two second flanges 313 are provided, and the two first flanges 312 and the two second flanges 313 are staggered in the axial direction A.

[0050] In some embodiments, as shown in FIG. 3 , the clamping portion 31 is provided with a spacing groove 316 between the two first flanges 312 , and the spacing groove 316 extends from the first flange 312 in the axial direction A to the clamping groove 311 .

[0051] Thus, when the snap ring 511 is inserted into the first flange 312, the spacing groove 316 provides space for the first flange 312 to move toward the central axis of the rotating shaft 20, allowing the snap ring 511 to pass over the first flange 312 and then snap into the slot 311. The first flange 312 then returns to its original position, and the hook portion 314 of the first flange 312 prevents the snap ring 511 from being dislodged. By providing the spacing groove 316, the snap portion 31 can be made of a plastic that is strong, aging-resistant, wear-resistant, and non-deformable. This ensures that the snap portion 31 can achieve elastic deformation in the radial direction R while maintaining sufficient strength.

[0052] In some embodiments, the outer surface of the first flange 312 is provided with a first inclined surface 3121 ; and / or the outer surface of the second flange 313 is provided with a second inclined surface 3131 .

[0053] As shown in Figures 2 to 4 , the first inclined surface 3121 slopes from top to bottom and acts as a chamfer, facilitating the insertion of the snap ring 511 into the first flange 312 of the snap-fit ​​portion 31 and preventing the snap ring 511 from abrading the edge of the snap-fit ​​portion 31. The second inclined surface 3131 slopes from bottom to top and prevents interference between the second flange 313 and the gear 32, thereby saving processing materials (as shown in Figure 4 ) and reducing costs.

[0054] In the second embodiment, as shown in Figures 5 to 8 , the positioning rod 50 also includes a first end 51 and a second end 52. The first end 51 of the positioning rod 50 is provided with an annular snap ring 511. The snap ring 511 is configured to be inserted into the annular snap groove 311 at the snap portion 31 of the positioning rod seat 30 and to form an interference fit with the snap groove 311. The second end 52 of the positioning rod 50 is provided with a hook-shaped hook 521. The hook 521 is configured to be inserted into the sector-shaped positioning gear 41 to secure the steel ball seat 40.

[0055] In the second embodiment, the structure of the positioning rod 50 is different from that of the first embodiment.

[0056] Specifically, as shown in Figure 5, the snap ring 511 in the second embodiment is not a closed-loop annular structure. In the second embodiment, the positioning rod 50 is formed by bending a metal rod. One end of the metal rod is bent vertically to form a hook 521 of the positioning rod 50. The middle part of the metal rod is bent into a ring shape to form a snap ring 511 with an opening 5111. The other end of the metal rod extends toward the direction of the hook 521 and is bent to form a fixing hook 53. The fixing hook 53 is hooked on the rod body of the metal rod.

[0057] When the non-closed-loop structured snap ring 511 is connected to the snap-fit ​​portion 31, the fixing hook 53 is temporarily not hooked onto the rod body of the metal rod. The snap ring 511 is inserted into the snap groove 311 of the snap-fit ​​portion 30 along the radial direction R through the opening 5111, and then the fixing hook 53 is hooked onto the rod body of the metal rod.

[0058] In this way, the positioning rod 50 has a simple structure, a low manufacturing process difficulty and a low cost, and the installation process of the positioning rod 50 and the positioning rod seat 30 is also simpler.

[0059] As can be seen from the above, the snap ring 511 in the second embodiment does not need to be axially inserted into the retaining groove 311 from the first flange 312 of the retaining portion 31, as in the first embodiment. The first flange 312 also does not need to undergo radial elastic deformation. Therefore, in the second embodiment, the structure of the corresponding retaining portion 31 of the positioning rod seat 30 can be different. As shown in FIG8 , the retaining portion 31 no longer has the first flange 312 and second flange 313 of the first embodiment. Instead, the retaining portion 31 directly forms the annular retaining groove 311. This simplifies the structure and processing of the retaining portion 31 of the positioning rod seat 30.

[0060] Furthermore, as shown in FIG6 , the hook 521 of the second end 52 of the positioning rod 50 has two parallel hook planes 522 . The hook planes 522 make the second end 52 flat, which is more conducive to engaging with the sector-shaped positioning gear 41 and preventing slippage.

[0061] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0062] It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are merely used to distinguish structures of the same type from one another and do not indicate a particular order or degree of importance. In fact, the expressions "first," "second," and the like are fully interchangeable. For example, a first structure could also be referred to as a second structure, and similarly, a second structure could also be referred to as a first structure without departing from the scope of this disclosure.

[0063] It can be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0064] It is further understood that, unless otherwise specified, “connection” includes a direct connection where there are no other components between the two elements, and also includes an indirect connection where there are other elements between the two elements.

[0065] It is further understood that although operations are described in a particular order in the drawings in the embodiments of the present disclosure, this should not be construed as requiring that the operations be performed in the particular order shown or in a serial order, or that all of the operations shown be performed to obtain the desired results. In certain circumstances, multitasking and parallel processing may be advantageous.

[0066] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0067] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A seat belt retractor (100), characterized in that: include: Retractor frame (10); a rotating shaft (20) rotatably mounted in the retractor frame (10); A positioning rod seat (30) is arranged outside the retractor frame (10) and is linked to the rotating shaft (20), and a clamping portion (31) is provided at the axial outer end of the positioning rod seat (30); A steel ball seat (40) is pivotally connected to the outside of the retractor frame (10), and the steel ball seat (40) is provided with a sector-shaped positioning gear (41); The positioning rod (50) comprises a first end (51) and a second end (52), wherein the first end (51) is linked to the clamping portion (31) of the positioning rod seat (30), and the second end (52) is used to be clamped or separated from the sector-shaped positioning gear (32) of the steel ball seat (40). The first end (51) is provided with a snap ring (511), the snap portion (31) is provided with a snap groove (311), and the snap ring (511) is embedded in the snap groove (311) and is interference-fitted with the snap groove (311).

2. The seat belt retractor (100) according to claim 1, characterized in that: The snap ring (511) is a closed ring. When the snap ring (511) is inserted into the snap portion (31) along the axial direction, the snap portion (31) undergoes elastic deformation along the radial direction (R) so that the snap ring (511) is snapped into the snap groove (311).

3. The seat belt retractor (100) according to claim 1, characterized in that: The snap ring (511) is a non-closed ring having an opening (5111), and the opening (5111) enables the snap ring (511) to be radially snap-fitted into the snap groove (311).

4. The seat belt retractor (100) according to claim 2 or 3, characterized in that: The clamping portion (31) comprises a first flange (312) and a second flange (313) spaced apart in the axial direction (A), and the clamping groove (311) is formed between the first flange (312) and the second flange (313); The first flange (312) extends from the radial edge toward the axial inner end to form a hook portion (314), and the second flange (313) extends from the radial edge toward the axial outer end to form a support portion (315). The distance between the hook portion (314) and the support portion (315) in the axial direction (A) is Smaller than the thickness of the snap ring (511).

5. The seat belt retractor (100) according to claim 4, characterized in that: A plurality of the first flanges (312) are provided and are evenly arranged at equal intervals along the circumferential direction (W); and / or A plurality of the second flanges (313) are provided and are evenly arranged at equal intervals along the circumferential direction (W).

6. The seat belt retractor (100) according to claim 5, characterized in that: The plurality of first flanges (312) and the plurality of second flanges (313) are arranged in the axial direction. (A) Staggered arrangement.

7. The seat belt retractor (100) according to claim 5, characterized in that: The clamping portion (31) is provided with a spacing groove (316) between the two first flanges (312), and the spacing groove (316) extends from the first flange (312) along the axial direction (A) to the clamping groove (311).

8. The seat belt retractor (100) according to claim 4, characterized in that: The outer surface of the first flange (312) is provided with a first inclined surface (3121); and / or The outer surface of the second flange (313) is provided with a second inclined surface (3131).

9. The seat belt retractor (100) according to claim 1, characterized in that: A gear (32) is also provided at the axial inner end of the positioning rod seat (30); the gear (32) and the clamping portion (31) are integrally formed, and the gear (32) is linked to the rotating shaft (20).

10. The seat belt retractor (100) according to claim 1, characterized in that: The positioning rod seat (30) is made of plastic material.

11. The seat belt retractor (100) according to claim 1, characterized in that: The positioning rod (50) is made of metal material.

12. The seat belt retractor (100) according to claim 1, characterized in that: Also includes: A locking disc is arranged outside the retractor frame (10) and is linked to the rotating shaft (20), and the outer periphery of the locking disc is provided with external teeth; The steel ball seat (40) further comprises: A rocker assembly is pivotally connected to the steel ball seat (40), and the rocker assembly is provided with a pawl. A steel ball is located in the arc groove between the steel ball seat (40) and the rocker assembly; When the vehicle tilts, the steel ball hits the rocker assembly according to inertia, causing the rocker assembly to rotate relative to the steel ball seat (40) and causing the ratchet to engage with the outer teeth to limit the rotation of the rotating shaft (20) relative to the retractor frame (10).

Images