CN209938528U - Coiler mandrel component and safety belt coiler - Google Patents

Abstract

The application provides a coiler dabber subassembly and safety belt coiler relates to coiler technical field, for the technical problem who solves the great torsional force of restriction that the dabber subassembly that exists can not be timely among the prior art. The retractor spindle assembly includes: a core shaft, a torsion bar and a shaft head; the torsion bar is arranged in the mandrel, one end of the torsion bar is clamped with the mandrel, the other end of the torsion bar is clamped with the mandrel head through a second-stage force limiting torsion piece, and a force limiting ring is arranged on the end surface of the mandrel; and a limiting groove is formed in the second-stage force limiting torsion piece, the limiting groove penetrates through the second-stage force limiting torsion piece, and the force limiting ring penetrates through the limiting groove to be in contact with the end face of the mandrel. The core shaft assembly of the winding machine ensures the stability when in locking, and has simple and compact structure and convenient production and processing.

Description

Coiler mandrel component and safety belt coiler

Technical Field

The application relates to the technical field of automobile safety facilities, in particular to a coiler mandrel component and a safety belt coiler.

Background

The Retractor is a Retractor with an Emergency Locking function, and is called an Emergency Locking Retractor, abbreviated as ELR. The automobile safety belt is a core component of an automobile safety belt, and the realized functions comprise spring recovery, vehicle inclination induction, vehicle rapid acceleration and deceleration induction, mesh belt acceleration induction and the like. The safety belt is made by the very big synthetic fiber of intensity, has the coiler that has self-locking function, and after fastening the safety belt, the coiler is automatic take it taut, in case emergency braking, head-on collision appear or when taking place to roll when the vehicle, the passenger can make the safety belt receive quick and violent tensile, and the self-locking function of coiler can block the safety belt in the twinkling of an eye at this moment, makes the passenger hug closely the seat, avoids falling out the car or the collision is injured.

The dabber subassembly in the coiler has the limit power function, and the coiler locking back receives great exogenic action when the safety belt receives the time spent of great exogenic action, and the safety belt that receives the exogenic action can produce great torsional force to the dabber subassembly, and the great torsional force of restriction that current dabber subassembly can not be timely, and then causes the coiler locking unstable.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a coiler dabber subassembly to solve the technical problem of the great torsional force of the dabber subassembly that exists among the prior art can not be timely restriction.

The application provides a roll-up device mandrel subassembly includes: a core shaft, a torsion bar and a shaft head;

the torsion bar is arranged in the mandrel, one end of the torsion bar is clamped with the mandrel, the other end of the torsion bar is clamped with the mandrel head through a second-stage force limiting torsion piece, and a force limiting ring is arranged on the end surface of the mandrel;

and a limiting groove is formed in the second-stage force limiting torsion piece, the limiting groove radially penetrates through the second-stage force limiting torsion piece, and the force limiting ring penetrates through the limiting groove to be in contact with the end face of the mandrel.

The second-stage force limiting torsion piece is provided with a connecting block, the shaft head is provided with a connecting port, and the connecting block is inserted into the connecting port; the two ends of the torsion bar are provided with splines, the second-stage force limiting torsion piece deviates from the end face of the connecting block and is provided with a first key groove, and the splines at one end of the torsion bar are clamped in the first key groove.

Furthermore, the end face of the mandrel is provided with a limiting part, and the force limiting ring is clamped on the end face of the mandrel through the limiting part.

Furthermore, the number of the limiting parts is 4, the limiting parts are respectively a first limiting part, a second limiting part, a third limiting part and a fourth limiting part, the first limiting part and the third limiting part are arranged on the mandrel in a relative mode, the second limiting part and the fourth limiting part are arranged on the mandrel in a relative mode, and the force limiting ring sequentially winds the first limiting part, the second limiting part, the limiting groove, the third limiting part and the fourth limiting part.

Furthermore, the number of the limiting parts is 6, and the limiting parts are respectively a fifth limiting part, a sixth limiting part, a seventh limiting part, an eighth limiting part, a ninth limiting part and a tenth limiting part, the fifth limiting part and the eighth limiting part are symmetrically distributed, the sixth limiting part and the ninth limiting part are symmetrically distributed, and the seventh limiting part and the tenth limiting part are symmetrically distributed; the limiting ring is wound along the outer side face of the seventh limiting portion, the inner side face of the sixth limiting portion, the outer side face of the fifth limiting portion, the limiting groove, the outer side face of the eighth limiting portion, the inner side face of the ninth limiting portion and the outer side face of the tenth limiting portion in sequence.

Further, the force limiting ring is provided with a first free end and a second free end, and the force limiting ring is sequentially divided into 5 sections from the first free end to the second free end, wherein the 5 sections are a first section, a second section, a third section, a fourth section and a fifth section;

the first segment and the fifth segment are both arc-shaped structures and are oppositely arranged on the force limiting ring; the third section is a linear structure and is arranged along the radial direction of the force limiting ring, the second section and the fourth section are arc structures, the second section and the fourth section are respectively positioned at two ends of the third section, and the opening directions of the second section and the fourth section are opposite; the first, second, fourth and fifth segments are each in contact with the stop.

Further, the arcuate structure includes a plurality of wave segments.

Further, the force limiting ring is provided with a third free end and a fourth free end, and the force limiting ring is sequentially divided into 7 sections from the third free end to the fourth free end, namely a sixth section, a seventh section, an eighth section, a ninth section, a tenth section, an eleventh section and a twelfth section; the sixth section and the twelfth section are both arc-shaped structures and are oppositely arranged on the force limiting ring; the seventh segment and the eleventh segment are arc-shaped structures and are oppositely arranged on the force limiting ring; the eighth section and the tenth section are of cuboid structures with arc surfaces at two ends and are oppositely arranged on the force limiting ring; the ninth section is a linear structure and is distributed along the radial direction of the force limiting ring; the sixth segment, the seventh segment, the eighth segment, the tenth segment, the eleventh segment, and the twelfth segment are all in contact with the stopper portion.

The spindle further comprises a ball wheel, the ball wheel is arranged between the spindle shaft and the spindle head, an insertion part is arranged on the spindle head, the limiting groove is arranged on the insertion part, and the insertion part is inserted into the ball wheel and is clamped with the ball wheel;

the connecting block is located in the ball wheel and is clamped with the ball wheel.

Compared with the prior art, the core assembly of the winding device has the following advantages:

the utility model provides a roll-up ware mandrel subassembly, when using, roll-up ware mandrel subassembly's spindle head is behind the locking, and the safety belt in the dabber continues to be emitted, and the dabber is pulled out along with the safety belt and continues to rotate, and torsion bar one end is along with the dabber rotates and twists reverse, and then makes the torsion bar receive torsional force, because the one end dabber looks joint of torsion bar, the position of dabber and torsion bar looks joint carries out one-level limit power to the torsion bar. The other end of the torsion bar is clamped with the shaft head through a second-stage force limiting torsion piece, the shaft head is fixed, namely the second-stage force limiting torsion piece is fixed, a force limiting ring is arranged on the end face of the mandrel, a limiting groove is formed in the second-stage force limiting torsion piece, the force limiting ring penetrates through the second-stage force limiting torsion piece to be in contact with the end face of the mandrel, the second-stage force limiting torsion piece has a fixed effect on the force limiting ring, and the force limiting ring can be in contact with the end face of the mandrel and generate resistance through friction, so that second-stage force limiting on the torsion bar is formed.

The application guarantees the stability of the reel assembly of the winding device during locking, and the winding device is simple and compact in structure and convenient to produce and process.

Another object of the present application is to provide a seat belt retractor to solve the technical problem that the existing spindle assembly in the prior art cannot limit the large torsion force in time.

In order to achieve the purpose, the technical scheme of the application is realized as follows:

the utility model provides a safety belt coiler, install like technical scheme above the coiler dabber subassembly in the safety belt coiler.

The safety belt retractor and the retractor mandrel component have the same advantages compared with the prior art, and the description is omitted.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of an arrangement structure of a mandrel assembly of a retractor according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating a relationship between a first force-limiting ring and a mandrel of a mandrel assembly of a retractor according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural view of a first limiting portion in a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a first force limiting ring in a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 5 is a schematic view illustrating a first force-limiting ring and a second force-limiting torsion element connected to a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating a second force limiting ring and spindle position relationship of a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a second force limiting ring in a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a second force-limiting ring and a second force-limiting torsion element connected to a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a second torque limiting element in a spindle assembly of a retractor according to an embodiment of the present disclosure from a first perspective;

FIG. 10 is a schematic structural diagram of a second torque limiting element in a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 11 is a schematic view of the connection between a torsion bar and a second torque limiting element in a spindle assembly of a retractor according to an embodiment of the present invention;

FIG. 12 is a schematic view of a spindle nose configuration in a spindle assembly of a retractor according to an embodiment of the present disclosure;

fig. 13 is a schematic view illustrating connection between a spindle head and a secondary force-limiting torsion member in the retractor spindle assembly according to an embodiment of the present application;

FIG. 14 is a schematic diagram illustrating a positional relationship between a third force limiting ring and a mandrel in a mandrel assembly of a retractor according to an embodiment of the present disclosure;

FIG. 15 is a schematic structural view of a second type of limiting portion in a spindle assembly of a retractor according to an embodiment of the present disclosure;

FIG. 16 is a schematic structural diagram of a third force limiting ring in a spindle assembly of a retractor according to an embodiment of the present invention.

In the figure: 1-mandrel; 2-a torsion bar; 3-a shaft head; 4-a second-stage force-limiting torsion piece; 5-a second keyway; 6-force limiting ring; 7-a limiting groove; 8-connecting blocks; 9-connecting port; 10-splines; 11-a first keyway; 12-a ball wheel; 13-a plug-in part; 14-a first stop; 15-a second limiting part; 16-a third limiting part; 17-a fourth limit portion; 18-a first free end; 19-a first segment; 20-a second segment; 21-a third segment; 22-a fourth segment; 23-a fifth segment; 24-a second free end; 25-a fifth limiting part; 26-a sixth limiting part; 27-a seventh limiting part; 28-an eighth limiting part; 29-ninth limit part; 30-tenth limit portion; 31-a third free end; 32-a sixth segment; 33-a seventh segment; 34-an eighth segment; 35-ninth segment; 36-tenth section; 37-eleventh segment; 38-the twelfth segment; 39-fourth free end.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments.

The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application.

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The first embodiment is as follows:

as shown in fig. 1 to 13, the spindle assembly structure of the roll-up device provided by the embodiment of the present application includes a spindle 1, a torsion bar 2 and a spindle head 3; the torsion bar 2 is arranged in the mandrel 1, one end of the torsion bar 2 is clamped with the mandrel 1, the other end of the torsion bar 2 is clamped with the shaft head 3 through a second-stage force limiting torsion piece 4, and the end surface of the mandrel 1 is provided with a force limiting ring 6; the second-stage force limiting torsion piece 4 is provided with a limiting groove 7, the limiting groove 7 penetrates through the second-stage force limiting torsion piece 4, and the force limiting ring 6 penetrates through the limiting groove 7 to be in contact with the end face of the mandrel 1.

As shown in fig. 9, the openings at the two ends of the limiting groove 7 are horn-shaped, and the edges of the openings are arc-shaped, so that the two ends of the limiting groove 7 can be prevented from cutting off the force limiting ring 6.

When the safety belt retractor is used, after the spindle head 3 of the reel-up spindle assembly is locked, the safety belt in the spindle 1 is continuously released, the spindle 1 is continuously rotated along with the pulling-out of the safety belt, one end of the torsion bar 2 is twisted along with the rotation of the spindle 1, and then the torsion bar 2 is subjected to twisting force, and as the spindle 1 at one end of the torsion bar 2 is clamped, the part where the spindle 1 is clamped with the torsion bar 2 limits the torsion bar 2 by one level. The other end of the torsion bar 2 is connected with the shaft head 3 in a clamping mode through the second-stage force limiting torsion piece 4, the shaft head 3 is fixed, namely the second-stage force limiting torsion piece 4 is fixed, the end face of the mandrel 1 is provided with the force limiting ring 6, the second-stage force limiting torsion piece 4 is provided with the limiting groove 7, the force limiting ring 6 penetrates through the second-stage force limiting torsion piece 4 to be in contact with the end face of the mandrel 1, the second-stage force limiting torsion piece 4 has a fixing effect on the force limiting ring 6, the force limiting ring 6 can be in contact with the end face of the mandrel 1 and generates resistance through friction, and second-stage force limiting on the torsion bar 2 is formed.

The application guarantees the stability of the reel assembly of the winding device during locking, and the winding device is simple and compact in structure and convenient to produce and process.

In this embodiment, be provided with connecting block 8 on second grade limit for torsion piece 4, be provided with connector 9 on the spindle nose 3, connecting block 8 is inserted and is located connector 9, and connecting block 8 has spacing effect to second grade limit for torsion piece 4.

Alternatively, the number of the connecting blocks 8 may be 2 or 3, etc., which is not specifically limited herein and may be specifically set according to specific situations.

The number of the connecting blocks 8 is the same as the number of the connecting ports 9, for example, as shown in fig. 6, when 2 connecting blocks 8 are arranged on the second-stage force-limiting torsion member 4, 2 connecting ports 9 are correspondingly arranged on the shaft head 3, and the connecting blocks 8 are matched with the connecting ports 9.

In one embodiment of this embodiment, splines 10 are disposed at both ends of the torsion bar 2, a first key groove 11 is disposed on an end surface of the second-stage force-limiting torsion member 4 away from the connecting block 8, and the spline 10 at one end of the torsion bar 2 is clamped in the first key groove 11.

The spline 10 at one end of the torsion bar 2 is clamped with the mandrel 1, specifically, a second key groove 5 is arranged on the mandrel 1 corresponding to one end of the torsion bar 2, the second key groove 5 is matched with the spline 10 at one end of the torsion bar 2, and the spline 10 at one end of the torsion bar 2 is clamped in the second key groove 5; the other end of the torsion bar 2 is clamped in the first key groove 11 through the spline 10, that is, two ends of the torsion bar 2 are respectively clamped with the mandrel 1 and the second-stage force-limiting torsion piece 4 through the spline 10.

Compared with the existing spindle assembly, the torsion bar 2 of the spindle assembly of the roll-up device provided by the embodiment can be connected with the spindle head 3 through the second-level force-limiting torsion piece 4, that is, one end surface of the second-level force-limiting torsion piece 4 is clamped with one end of the torsion bar 2, and the other end surface of the second-level force-limiting torsion piece 4 is clamped with the spindle head 3 through the connecting block 8. When the torsion bar 2 is subjected to a large torsion force, the two-stage force limiting torsion piece 4 can have a better fixing effect on the torsion bar 2 because the locked shaft heads 3 are fixed.

The reel mandrel component provided by the embodiment further comprises a ball wheel 12, wherein the ball wheel 12 is arranged between the mandrel 1 and the mandrel head 3, and the outer circumferential surface of the ball wheel 12 is provided with a plurality of semicircular grooves which are uniformly distributed along the circumference and used for being connected with a driving piece. The shaft head 3 is provided with an inserting part 13, the limiting port is arranged on the inserting part 13, and the inserting part 13 is inserted into the ball wheel 12 and is clamped with the ball wheel 12; the connecting block 8 is positioned in the ball wheel 12 and is clamped with the ball wheel 12.

Specifically, ball wheel 12 is cylindric, and inside is cavity, forms the cylinder cavity, and the plug part 13 looks adaptation on cylinder cavity and the spindle nose 3 for plug part 13 can insert and establish in the cylinder cavity.

A plurality of first bulges are arranged on the inner wall of the ball wheel 12 at intervals, and a first groove is formed in the area between every two adjacent first bulges; a plurality of second bulges are arranged on the outer wall of the insertion part 13 of the shaft head 3 and are arranged at intervals, a second groove is formed in the area between every two adjacent second bulges, the first bulges are matched with the second grooves, and the second bulges are matched with the first grooves; when the inserting part 13 on the shaft head 3 is inserted into the ball wheel 12, the first bulge is positioned in the second groove, and the second bulge is positioned in the first groove, so that the relative rotation of the shaft head 3 and the ball wheel 12 can be avoided.

Since the insertion part 13 is located in the ball wheel 12, the connection block 8 is inserted into the connection port 9 on the insertion part 13, i.e. the connection block 8 is located in the ball wheel 12. Specifically, be provided with a plurality of third archs on connecting block 8's the outer wall, a plurality of third archs interval are arranged, and the region between per two adjacent third archs forms the third recess, and connecting block 8 is located ball wheel 12, and the third arch is located first recess this moment, and partial first arch is located the third recess, has avoided the relative rotation of second grade limit for strength torsion piece 4 and ball wheel 12, also further has avoided spindle nose 3 and ball wheel 12 relative rotation simultaneously.

In this embodiment, the end surface of the mandrel 1 is provided with a limiting portion, and the force limiting ring 6 is clamped on the end surface of the mandrel 1 through the limiting portion.

When the torsion bar 2 receives a large torsion force, the torsion bar 2 and the mandrel 1 can rotate relatively, and then the limiting part on the mandrel 1 and the second-level force limiting torsion piece 4 rotate relatively, at the moment, the force limiting ring 6 can deform and generate a friction force with the limiting part on the mandrel 1, so that the second-level force limiting is performed on the torsion bar 2.

The ball wheel 12 is provided with a bushing, by means of which the ball wheel 12 is connected to the spindle 1, so that the ball wheel 12 can be better connected to the spindle 1.

In an implementation manner of this embodiment, as shown in fig. 3, the number of the limiting portions includes 4, which are respectively a first limiting portion 14, a second limiting portion 15, a third limiting portion 16 and a fourth limiting portion 17, the first limiting portion 14 and the third limiting portion 16 are oppositely disposed on the mandrel 1, the second limiting portion 15 and the fourth limiting portion 17 are oppositely disposed on the mandrel 1, and the force limiting ring 6 is sequentially wound along the first limiting portion 14, the second limiting portion 15, the limiting groove 7, the third limiting portion 16 and the fourth limiting portion 17.

The first limiting portion 14 and the fourth limiting portion 17 are both arc-shaped structures, and the second limiting portion 15 and the third limiting portion 16 are both strip-shaped structures.

When the torsion bar 2 is subjected to a large torsion force, the limiting part and the force limiting ring 6 rotate relatively. The force limiting ring 6 penetrates through the limiting groove 7, the limiting groove 7 has a fixing effect on the force limiting ring 6, and the force limiting ring 6 can generate friction with the first limiting portion 14, the second limiting portion 15, the third limiting portion 16 and the fourth limiting portion 17, so that the friction force between the force limiting ring 6 and the limiting portions is increased, and the secondary force limiting on the torsion bar 2 is further increased.

The force limiting ring 6 has a first free end 18 and a second free end 24, and for convenience of describing the structural shape of different regions of the force limiting ring 6, the force limiting ring 6 is divided into 5 segments, which are sequentially referred to as a first segment 19, a second segment 20, a third segment 21, a fourth segment 22 and a fifth segment 23 from the first free end 18 to the second free end 24.

The first segment 19 and the fifth segment 23 are both arc-shaped structures and are oppositely arranged on the force limiting ring 6; the third segment 21 is a linear structure and is arranged along the radial direction of the force limiting ring 6, the second segment 20 and the fourth segment 22 are arc-shaped structures, the second segment 20 and the fourth segment 22 are respectively arranged at two ends of the third segment 21, and the opening directions of the second segment 20 and the fourth segment 22 are opposite.

The first, second, fourth and fifth segments 19, 20, 22, 23 are all in contact with the stop. In particular, the first segment 19 is in contact with the first stop portion 14, the second segment 20 is in contact with the second stop portion 15, the fourth segment 22 is in contact with the third stop portion 16, and the fourth segment is in contact with the fourth stop portion 17.

When the reel mandrel assembly of the reel is locked, the mandrel head 3 and the secondary force-limiting torsion piece 4 are both fixed and do not rotate, the mandrel 1 continues to rotate along with the pulling-out of the safety belt, the limiting part and the secondary force-limiting torsion piece 4 rotate relatively, so that the force-limiting ring 6 is pulled out of the limiting part and is wound on the periphery of the secondary force-limiting torsion piece 4, and when the force-limiting ring 6 is integrally wound on the secondary force-limiting torsion head 4, namely, when all areas of the force-limiting ring 6 are wound on the periphery of the secondary force-limiting torsion piece 4, the secondary force-limiting process is finished.

When spacing portion and second grade limit for torsion head 4 relative rotation, the frictional resistance that produces between spacing portion and the power limiting ring 6, the resistance that the friction produced can cushion the torsional force, and the resistance that the friction produced can improve the power value of second grade limit for torsion.

Optionally, the arcuate structure comprises a plurality of wave segments.

Specifically, the arc-shaped structures are provided with a plurality of crest portions and a plurality of trough portions, and the crest portions and the trough portions are arranged at intervals; that is, a plurality of wave crest portions and a plurality of wave trough portions are provided on each of the first segment and the fifth segment.

The wave crest parts on the first section 19 are all contacted with the first limit part 14, and the wave trough parts on the first section 19 are all contacted with the edge of the mandrel 1; the peak portions of the fifth segment 23 are all in contact with the fourth limiting portion 17, and the valley portions of the fifth segment 23 are all in contact with the edge of the mandrel 1.

When the limiting part and the secondary force limiting torsion piece 4 rotate relatively, so that the force limiting ring 6 is pulled out from the limiting part, as the first section 19 and the fifth section 23 are of the wave-shaped structures, the first section 19 and the fifth section 23 are straightened firstly and then pulled out in the process of pulling out the force limiting ring 6, the secondary force limiting is further enhanced, when the force limiting ring 6 is pulled out from the limiting part integrally, and the force limiting ring 6 is rolled on the periphery of the secondary force limiting torsion piece 4 integrally, and the secondary force limiting process is finished.

Similarly, when the first segment 19 and the first position-limiting portion 14 rotate relatively, the fifth segment 23 and the fourth position-limiting portion 17 also rotate relatively, the wavy structure on the fifth segment 23 increases the contact area with the fourth position-limiting portion 17, so as to increase the friction between the fifth segment 23 and the fourth position-limiting portion 17, increase the friction between the force-limiting ring 6 and the position-limiting portion, and further increase the second-level force-limiting force on the torsion bar 2.

Example two:

as shown in fig. 14-16, in the spindle assembly of the retractor according to the present embodiment, there are 6 limiting portions, which are respectively a fifth limiting portion 25, a sixth limiting portion 26, a seventh limiting portion 27, an eighth limiting portion 28, a ninth limiting portion 29 and a tenth limiting portion 30, where the fifth limiting portion 25 and the eighth limiting portion 28 are symmetrically distributed, the sixth limiting portion 26 and the ninth limiting portion 29 are symmetrically distributed, and the seventh limiting portion 27 and the tenth limiting portion 30 are symmetrically distributed; the force limiting ring 6 is wound along the outer side surface of the seventh limiting portion 27, the inner side surface of the sixth limiting portion 26, the outer side surface of the fifth limiting portion 25, the limiting groove 7, the outer side surface of the eighth limiting portion 28, the inner side surface of the ninth limiting portion 29 and the outer side surface of the tenth limiting portion 30 in sequence.

In order to increase the contact area between the limiting part and the force limiting ring 6 and increase the friction force, further, the fifth limiting part 25 and the eighth limiting part 28 are both strip-shaped; the sixth limiting part 26 and the ninth limiting part 29 are both cylindrical; the seventh limiting portion 27 and the tenth limiting portion 30 are both arc-shaped.

Further, the force limiting ring 6 has a third free end 31 and a fourth free end 39, and for convenience of describing the structural shape of various regions on the force limiting ring 6, the force limiting ring 6 is divided into 7 segments, which are sequentially referred to as a sixth segment 32, a seventh segment 33, an eighth segment 34, a ninth segment 35, a tenth segment 36, an eleventh segment 37 and a twelfth segment 38 from the third free end 31 to the fourth free end 39; the sixth segment 32 and the twelfth segment 38 are both arc-shaped structures and are oppositely arranged on the force limiting ring 6; the seventh segment 33 and the eleventh segment 37 are arc-shaped structures and are oppositely arranged on the force limiting ring 6; the eighth section 34 and the tenth section 36 are cuboid structures with arc surfaces at two ends and are oppositely arranged on the force limiting ring 6; the ninth segment 35 is a linear structure and is arranged along the radial direction of the force limiting ring 6; the sixth, seventh, eighth, tenth, eleventh, and twelfth segments 32, 33, 34, 36, 37, and 38 are all in contact with the stopper portion. Specifically, the sixth segment 32 contacts the outer side surface of the fifth limiting portion 25, the seventh segment 33 contacts the inner side surface of the sixth limiting portion 26, the eighth segment 34 contacts the outer side surface of the seventh limiting portion 27, the tenth segment 36 contacts the outer side surface of the eighth limiting portion 28, the eleventh segment 37 contacts the inner side surface of the ninth limiting portion 29, and the twelfth segment 38 contacts the outer side surface of the tenth limiting portion 30.

The force limiting ring 6 is made of elastic steel bars, has resilience and elasticity and is high in performance; the sixth segment 32 has the same arc as the twelfth segment 38; the cross section of the elastic rigid strip for manufacturing the force limiting ring 6 is a rectangle with arc angles at two ends, and the inner side of the force limiting ring 6 can be fully rubbed with the retractor mandrel 1; the third free end 31 is at the end of the sixth segment 32 and the fourth free end 39 is at the end of the twelfth segment 38.

The structure of the sixth section 32, the seventh section 33, the eighth section 34, the ninth section 35, the tenth section 36, the eleventh section 37 and the twelfth section 38 is adopted, so that the winding and installation are facilitated at the end part of the mandrel 1, when the automobile encounters an emergency, one end of the mandrel 1 is locked, the mandrel 1 generates a torsional force, at this time, as friction is formed between the continuous rotation of the mandrel 1 and the force limiting ring 6 is pressed, the sixth section 32, the seventh section 33, the eighth section 34, the ninth section 35, the tenth section 36, the eleventh section 37 and the twelfth section 38 of the force limiting ring 6 are deformed, so that a secondary limiting force is further formed by utilizing the deformation force and the friction force, and the stability of the retractor in locking is effectively ensured.

EXAMPLE III

The present embodiment provides a web retractor comprising the spool assembly of the first or second embodiment.

In this embodiment, since the web retractor includes the reel spindle assembly provided in the first embodiment or the second embodiment, all the advantages of the reel spindle assembly are provided, and thus, the description thereof is omitted.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A retractor spindle assembly comprising: a core shaft, a torsion bar and a shaft head;

the torsion bar is arranged in the mandrel, one end of the torsion bar is clamped with the mandrel, the other end of the torsion bar is clamped with the mandrel head through a second-stage force limiting torsion piece, and a force limiting ring is arranged on the end surface of the mandrel;

and a limiting groove is formed in the second-stage force limiting torsion piece, the limiting groove radially penetrates through the second-stage force limiting torsion piece along the second-stage force limiting torsion piece, and the force limiting ring penetrates through the limiting groove to be in contact with the end face of the mandrel.

2. The retractor mandrel assembly according to claim 1, wherein a connecting block is arranged on the secondary force-limiting torsion member, a connecting port is arranged on the mandrel head, and the connecting block is inserted into the connecting port; the two ends of the torsion bar are provided with splines, the second-stage force limiting torsion piece deviates from the end face of the connecting block and is provided with a first key groove, and the splines at one end of the torsion bar are clamped in the first key groove.

3. The retractor mandrel assembly as claimed in claim 1, wherein a limit portion is provided on an end surface of the mandrel, and the limit ring is engaged with the end surface of the mandrel through the limit portion.

4. The spindle assembly according to claim 3, wherein the number of the limiting portions is 4, and the limiting portions are respectively a first limiting portion, a second limiting portion, a third limiting portion and a fourth limiting portion, the first limiting portion and the third limiting portion are oppositely disposed on the spindle, the second limiting portion and the fourth limiting portion are oppositely disposed on the spindle, and the force limiting ring is sequentially wound along the first limiting portion, the second limiting portion, the limiting groove, the third limiting portion and the fourth limiting portion.

5. The core shaft assembly according to claim 3, wherein the number of the limiting portions is 6, and the limiting portions are respectively a fifth limiting portion, a sixth limiting portion, a seventh limiting portion, an eighth limiting portion, a ninth limiting portion and a tenth limiting portion, the fifth limiting portion and the eighth limiting portion are symmetrically distributed, the sixth limiting portion and the ninth limiting portion are symmetrically distributed, and the seventh limiting portion and the tenth limiting portion are symmetrically distributed; the limiting ring is wound along the outer side face of the seventh limiting portion, the inner side face of the sixth limiting portion, the outer side face of the fifth limiting portion, the limiting groove, the outer side face of the eighth limiting portion, the inner side face of the ninth limiting portion and the outer side face of the tenth limiting portion in sequence.

6. The retractor spindle assembly of claim 4 wherein the force limiting ring has a first free end and a second free end, the force limiting ring being sequentially divided into 5 segments, a first segment, a second segment, a third segment, a fourth segment, and a fifth segment from the first free end to the second free end;

the first segment and the fifth segment are both arc-shaped structures and are oppositely arranged on the force limiting ring; the third section is a linear structure and is arranged along the radial direction of the force limiting ring, the second section and the fourth section are arc structures, the second section and the fourth section are respectively positioned at two ends of the third section, and the opening directions of the second section and the fourth section are opposite; the first, second, fourth and fifth segments are each in contact with the stop.

7. The retractor mandrel assembly as claimed in claim 6 wherein said arcuate structure includes a plurality of undulating segments.

8. The retractor spindle assembly of claim 5 wherein the force limiting ring has a third free end and a fourth free end, the force limiting ring being divided into 7 segments, a sixth segment, a seventh segment, an eighth segment, a ninth segment, a tenth segment, an eleventh segment, and a twelfth segment, in order from the third free end to the fourth free end; the sixth section and the twelfth section are both arc-shaped structures and are oppositely arranged on the force limiting ring; the seventh segment and the eleventh segment are arc-shaped structures and are oppositely arranged on the force limiting ring; the eighth section and the tenth section are of cuboid structures with arc surfaces at two ends and are oppositely arranged on the force limiting ring; the ninth section is a linear structure and is distributed along the radial direction of the force limiting ring; the sixth segment, the seventh segment, the eighth segment, the tenth segment, the eleventh segment, and the twelfth segment are all in contact with the stopper portion.

9. The retractor mandrel assembly as claimed in claim 2, further comprising a ball wheel, wherein the ball wheel is disposed between the mandrel and the mandrel head, an insertion portion is disposed on the mandrel head, the limiting groove is disposed on the insertion portion, and the insertion portion is inserted into the ball wheel and is clamped with the ball wheel;

the connecting block is located in the ball wheel and is clamped with the ball wheel.

10. A seatbelt retractor, comprising the retractor spindle assembly as claimed in any one of claims 1 to 9.

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