CN110562194A

CN110562194A - Retractor spindle assembly and safety belt retractor

Info

Publication number: CN110562194A
Application number: CN201910982292.6A
Authority: CN
Inventors: 胡晏殊; 陈俊海; 宫良杰; 黄来国; 田雪; 李明阳; 刘彦广
Original assignee: SHENYANG JINBEI JINHENG AUTOMOTIVE SAFETY SYSTEM CO Ltd
Current assignee: SHENYANG JINBEI JINHENG AUTOMOTIVE SAFETY SYSTEM CO Ltd
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2019-12-13

Abstract

the invention relates to the technical field of automobile safety facilities, in particular to a retractor mandrel assembly and a safety belt retractor. The retractor mandrel assembly comprises a mandrel, a torsion bar, a stop ring, a torsion head, a force limiting ring and a mandrel head; the torque head is connected with the shaft head, the stop ring is connected with the mandrel, and the torque head is in threaded connection with the stop ring; one end of the torsion bar is connected with the torsion head, and the other end of the torsion bar is connected with the mandrel; the interlude joint of limit for force ring is on torsion head, and first winding section and second winding section are mutually the joint with the mandrel. When the force limiting function of the retractor is started, and the mandrel and the shaft head rotate relatively, the force limiting ring deforms and generates resistance to the rotation of the mandrel, so that secondary force limiting on the mandrel is formed, and the stability of the mandrel assembly in locking is ensured; meanwhile, the stop ring rotates along with the mandrel, the stop ring cannot continue to rotate until the stop ring reaches the root of the torque head, the mandrel stops rotating along with the stop ring, the safety braid cannot be continuously pulled out, and the force limiting and stopping function of the mandrel assembly of the winding device is achieved.

Description

retractor spindle assembly and safety belt retractor

Technical Field

The invention relates to the technical field of automobile safety facilities, in particular to a retractor mandrel assembly and a safety belt retractor.

Background

The spindle assembly of the existing safety belt retractor has a force limiting function, and when a vehicle is in collision accident, the pretensioner can lock the safety belt to prevent the safety belt from being pulled out, so that the safety belt retractor has a protection effect on a human body. Under the action of impact force and human inertia, the safety belt is subjected to a larger external force, so that after the torque acting on the torsion bar reaches the starting torque, the safety belt can be continuously pulled out to buffer the impact on the chest of a passenger; however, the existing spindle assembly cannot limit a large torsion force in time, the spindle assembly of the safety belt retractor is not locked stably, and the spindle assembly of the safety belt retractor is not easy to control to stop after the force limiting function is started, so that the safety belt can be continuously pulled out, the body of a passenger cannot be effectively bound, and the passenger is injured.

Disclosure of Invention

the invention aims to provide a retractor spindle assembly and a safety belt retractor, and aims to solve the technical problems that in the prior art, the spindle assembly is unstable in locking and the stopping of the spindle assembly is difficult to control after a force limiting function is started.

The invention provides a coiler mandrel component which comprises a mandrel, a torsion bar, a stop ring, a torsion head, a force limiting ring and a mandrel head, wherein the mandrel comprises a mandrel body and a mandrel cover; one end of the torque head is connected with the shaft head, and the other end of the torque head is provided with an external thread connecting part; the stop ring is positioned at one end of the mandrel, which faces the shaft head, and is connected with the mandrel; an internal thread connecting part matched with the external thread connecting part is arranged on the inner wall of the stop ring, and the stop ring is in threaded connection with the torque head; a stopping part is arranged on the outer wall of the torque head, and when the stopping ring is screwed to the root part of the external thread connecting part, the stopping ring can abut against the stopping part; the torsion bar is positioned in the mandrel, one end of the torsion bar is connected with the end part of the mandrel, and the other end of the torsion bar is connected with the shaft head through the torsion head; the force limiting ring is positioned on the end face of one end, facing the spindle head, of the spindle and comprises a middle section, a first winding section and a second winding section, the first winding section is connected with one end of the middle section, the second winding section is connected with the other end of the middle section, and the first winding section and the second winding section extend and wind along a first direction; the middle section of the force limiting ring is positioned on the end face of one end, facing the shaft head, of the torsion head and is clamped with the torsion head; a first pushing block and a second pushing block which are oppositely arranged are arranged on the end face of one end, facing the spindle head, of the spindle; the first winding section is wound along the outer side of the first pushing block, and the second winding section is wound along the outer side of the second pushing block, so that the force limiting ring is clamped on the mandrel.

Furthermore, a limiting groove is arranged on the end surface of one end, facing the shaft head, of the torque head along the radial direction of the end surface, and penetrates through the end surface of the torque head; the middle section of the force limiting ring is clamped in the limiting groove.

further, the first pushing block comprises a first boss part and a first extension part; the second pushing block comprises a second boss part and a second extending part; the first boss portion is arranged opposite to the second boss portion; one end of the first extending part is connected with the first boss part, and the other end of the first extending part extends along the first direction; one end of the second extending portion is connected to the second boss portion, and the other end extends in the first direction.

Furthermore, two limiting bosses are oppositely arranged on the end face of one end, facing the shaft head, of the torque head, the two limiting bosses are both fan-shaped, and a gap is formed between vertex angles of the two limiting bosses; the middle section of the force limiting ring penetrates through the torque head through the gap and can abut against the two limiting bosses.

furthermore, both ends of the torsion bar are provided with splines, a first key groove matched with the splines is arranged on the end face of one end, facing the mandrel, of the torsion head, and a second key groove matched with the splines is arranged on the end part, connected with the torsion bar, of the mandrel.

Furthermore, a connecting boss is arranged on the end face of one end, facing the mandrel, of the shaft head, and an inserting port is arranged on the connecting boss; the end face, facing one end of the shaft head, of the torsion head is provided with a first inserting portion, and the torsion head is inserted into the inserting port through the first inserting portion and is clamped with the shaft head.

Furthermore, a protrusion is arranged on the side wall of the socket.

Furthermore, a second inserting part is arranged on the outer wall of the stop ring; a first step part is arranged at one end of the mandrel facing the shaft head, and an inserting groove is formed in the side wall of the first step part; the stop ring can be placed in the first step part, and the stop ring is inserted into the insertion groove through the second insertion part and is connected with the mandrel.

Further, the ball wheel and the bushing are further included; the ball wheel is positioned between the spindle head and the spindle, one end of the ball wheel is connected with the spindle head, and the other end of the ball wheel is connected with the spindle; the connecting part and the first inserting part are both positioned in the ball wheel and are clamped with the ball wheel; the shaft bushing is positioned between the ball wheel and the core shaft, a second step part is arranged in the shaft bushing, and the core shaft faces one end of the shaft head and can partially extend into the shaft bushing and abut against the second step part.

the invention also provides a safety belt retractor, which comprises the retractor mandrel component.

compared with the prior art, the invention has the beneficial effects that:

the invention provides a coiler mandrel component which comprises a mandrel, a torsion bar, a stop ring, a torsion head, a force limiting ring and a mandrel head; one end of the torque head is connected with one end of the spindle head facing the spindle, and the stop ring is connected with one end of the spindle head facing the spindle; an external thread connecting part is arranged at one end of the torque head facing the mandrel, an internal thread connecting part is arranged on the inner wall of the stop ring, and the stop ring can be screwed on the torque head; thereby the mandrel is connected with the shaft head through the threaded connection of the stop ring and the torque head. It should be noted that, during initial assembly, the snap ring is mounted in the first position of the torque head at a distance from the root of the externally threaded connection. The torsion bar is located the dabber, and the one end of torsion bar is connected with the tip of dabber, and the other end of torsion bar is connected with the spindle nose through the torque head. The force limiting ring comprises a middle section, a first winding section and a second winding section, and the middle section is clamped on the end face of one end, facing the shaft head, of the torque head; the dabber is provided with first promotion piece and second on the terminal surface towards the one end of spindle nose, and the outside winding of first promotion piece is followed to the first winding section of limit ring, and the outside winding of second promotion piece is followed to the second winding section, makes limit ring also be in the same place with the dabber joint.

When the car bumps, the coiler limit for force function starts, the spindle nose of dabber subassembly is locked, along with the safety belt is continued to be pulled out, the relative rotation takes place for dabber and spindle nose, because limit for force ring passes through the fixed joint of interlude and torsion overhead, first winding section and second winding section can be taken out under the first promotion that promotes piece and second and promote the promotion of piece, and rotate the production resistance to the dabber, thereby form the second grade limit for force to the dabber, the stability ability of dabber subassembly when the locking has been guaranteed. Meanwhile, the stop ring rotates along with the rotation of the mandrel, and in the rotating process, the stop ring can move towards the direction close to the root part of the external thread connecting part along the length direction of the external thread connecting part on the torque head until the stop ring reaches the root part of the torque head and cannot move forwards continuously, the rotation is stopped along with the stop ring, the mandrel is forced to stop rotating, the safety braid cannot be pulled out continuously, and therefore the force limiting and stopping function of the mandrel component of the winding device is achieved.

Therefore, the mandrel is subjected to secondary force limitation by arranging the force limiting ring, so that the stability of the mandrel assembly during locking is ensured; the stop ring and the torsion head which are connected by threads are arranged between the mandrel and the shaft head, so that the function of limiting force and stopping is realized; therefore, the core shaft assembly of the retractor has the functions of two-stage force limitation and force limitation stopping, and the protection capability of the safety belt to passengers is improved.

The invention also provides a safety belt retractor which comprises the retractor spindle assembly, so that the safety belt retractor also has the beneficial effect of the retractor spindle assembly.

Drawings

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

FIG. 1 is a schematic overall structural view of a spindle assembly of a retractor according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a core assembly of a roll-up device according to an embodiment of the present invention after components are disassembled;

Fig. 3 is a schematic structural diagram of a spindle head in the retractor spindle assembly according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a torque head in a spindle assembly of a retractor according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a further torque head in a spindle assembly of a retractor according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a force limiting ring in a spindle assembly of a retractor according to an embodiment of the present invention;

Fig. 7 is a schematic structural view of a stop ring of the retractor spindle assembly according to an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a spindle in the retractor spindle assembly according to an embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating a relationship among positions of a force limiting ring, a torque head and a mandrel in a mandrel assembly of a retractor according to an embodiment of the present invention;

FIG. 10 is a schematic diagram illustrating the positional relationship of a force limiting ring, a torque head and a spindle in a spindle assembly of another retractor according to an embodiment of the present invention;

FIG. 11 is a schematic diagram illustrating a variation in the positional relationship between the torque head and the stop ring in the spindle assembly of the retractor according to an embodiment of the present invention;

Fig. 12 is a schematic structural view of a bushing in the retractor spindle assembly according to an embodiment of the present invention.

Reference numerals:

1-mandrel, 11-first pushing block, 12-second pushing block, 13-first boss part, 14-first extension part, 15-second boss part, 16-second extension part, 17-insertion groove, 18-first step part, 2-torsion bar, 3-stop ring, 31-internal thread connection part, 32-second insertion part, 4-torsion bar, 41-external thread connection part, 42-limit groove, 43-limit boss, 44-stop part, 45-first insertion part, 5-limit ring, 51-middle section, 52-first winding section, 53-second winding section, 6-mandrel head, 61-connection boss, 62-insertion port, 63-protrusion, 7-bushing, 71-second step part, 8-ball wheel, a-first direction.

Detailed Description

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

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

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 invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., 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, but 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 invention. 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 invention, it should 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A retractor spindle assembly and a seatbelt retractor according to some embodiments of the present application are described below with reference to fig. 1-12.

the application provides a retractor mandrel assembly, as shown in fig. 1 to 8, comprising a mandrel 1, a torsion bar 2, a stop ring 3, a torsion head 4, a force limiting ring 5 and a mandrel head 6; one end of the torque head 4 is connected with the shaft head 6, and the other end of the torque head 4 is provided with an external thread connecting part 41; the stop ring 3 is positioned at one end of the mandrel 1 facing the shaft head 6 and is connected with the mandrel 1; the inner wall of the stop ring 3 is provided with an internal thread connecting part 31 matched with the external thread connecting part 41, and the stop ring 3 is in threaded connection with the torque head 4; a stopping part 44 is arranged on the outer wall of the torque head 4, and when the stopping ring 3 is screwed to the root part of the external thread connecting part 41, the stopping ring 3 can be abutted against the stopping part 44; the torsion bar 2 is positioned in the mandrel 1, one end of the torsion bar 2 is connected with the end part of the mandrel 1, and the other end of the torsion bar 2 is connected with the shaft head 6 through the torsion head 4; the force limiting ring 5 is positioned on the end face of one end of the mandrel 1 facing the shaft head 6 and comprises a middle section 51, a first winding section 52 connected with one end of the middle section 51 and a second winding section 53 connected with the other end of the middle section 51, and the first winding section 52 and the second winding section 53 extend and wind along a first direction a; the middle section 51 of the force limiting ring 5 is positioned on the end surface of one end of the torque head 4 facing the shaft head 6 and is clamped with the torque head 4; a first pushing block 11 and a second pushing block 12 which are oppositely arranged are arranged on the end surface of one end of the mandrel 1 facing the shaft head 6; the first winding section 52 is wound along the outer side of the first pushing block 11, and the second winding section 53 is wound along the outer side of the second pushing block 12, so that the force limiting ring 5 is clamped on the mandrel 1.

The retractor mandrel assembly comprises a mandrel 1, a torsion bar 2, a stop ring 3, a torsion head 4, a force limiting ring 5 and a mandrel head 6; the torque head 4 and the stop ring 3 are positioned between the mandrel 1 and the shaft head 6, and the mandrel 1 is connected with the shaft head 6 through the torque head 4 and the stop ring 3; wherein one end of the torque head 4 is connected with one end of the spindle head 6 facing the spindle 1, and the stop ring 3 is connected with one end of the spindle 1 facing the spindle head 6; an external thread connecting part 41 is arranged at one end of the torque head 4 facing the mandrel 1, and an internal thread connecting part 31 matched with the external thread connecting part 41 is arranged on the inner wall of the stop ring 3, so that the stop ring 3 can be screwed on the torque head 4; thereby connecting the spindle 1 and the spindle head 6 together by means of the threaded connection of the snap ring 3 and the torque head 4. The outer wall of the torque head 4 is further provided with a stopping portion 44, and the stopping portion 44 is located at the root of the external thread connecting portion 41, when the stopping ring 3 is screwed to the root of the external thread connecting portion 41, one end of the stopping ring 3 abuts against the stopping portion 44 and cannot rotate continuously, so that the spindle 1 is forced to stop rotating along with the stopping portion, the safety braid cannot be pulled out continuously, and the force limitation stop of the spindle assembly is realized. Torsion bar 2 is located dabber 1, and the one end of torsion bar 2 is connected with the tip of dabber 1, and the other end of torsion bar 2 is connected with spindle nose 6 through torque head 4.

It should be noted that, during initial assembly, as shown in fig. 11, the stop ring 3 is installed at a first position of the torque head 4, and there is still a distance from the root of the external threaded connection portion 41, when the torque head 6 and the torque head 4 are fixed, when the mandrel 1 is rotated by an external force, the stop ring 3 rotates therewith, and the stop ring 3 and the mandrel 1 can move along the length direction of the external threaded connection portion 41 to the root close to the external threaded connection portion 41 until one end of the stop ring 3 abuts against the stop portion 44, and cannot rotate continuously, so that the mandrel 1 is forced to stop rotating therewith.

the force limiting ring 5 comprises a middle section 51, a first winding section 52 and a second winding section 53, wherein two ends of the middle section 51 are respectively connected with the first winding section 52 and the second winding section 53; the first winding section 52 and the second winding section 53 are each wound extending in the first direction a. The middle section 51 of the force limiting ring 5 is clamped on the end surface of one end of the torque head 4 facing the shaft head 6; the end face of one end, facing the spindle head 6, of the spindle 1 is provided with a first pushing block 11 and a second pushing block 12, a first winding section 52 of the force limiting ring 5 is wound along the outer side of the first pushing block 11, and a second winding section 53 is wound along the outer side of the second pushing block 12, so that the force limiting ring 5 is also clamped with the spindle 1.

When an automobile collides, the force limiting function of the retractor is started, the shaft head 6 of the mandrel component is locked, the safety belt can be continuously pulled out under the action of impact force and human body inertia, the mandrel 1 rotates in the direction opposite to the first direction a, and the torsion bar 2 is used for limiting the primary force of the mandrel 1. Because the mandrel 1 and the shaft head 6 rotate relatively, and the force limiting ring 5 is fixedly clamped and connected with the torsion head 4 through the middle section 51, the first winding section 52 and the second winding section 53 can be pulled out under the pushing of the first pushing block 11 and the second pushing block 12, and generate resistance to the rotation of the mandrel 1; the first winding section 52 and the second winding section 53 that are taken out twine between the first stopper that promotes piece 11 and second promotion piece 12 and torsion head to form the second grade limit power to dabber 1, guaranteed the stability can of dabber subassembly when the locking, and simple structure, production and processing are convenient.

Meanwhile, along with the rotation of the mandrel 1, the stop ring 3 rotates along with the mandrel, and in the rotating process, the stop ring 3 moves towards the root direction close to the external thread connecting part 41 along the length direction of the external thread connecting part 41 on the torque head 4 until one end of the stop ring 3 abuts against the stopping part 44 and cannot rotate continuously, so that the mandrel 1 is forced to stop rotating along with the stop ring, the safety braid cannot be pulled out continuously, and the force limiting and stopping function of the mandrel assembly of the winding device is realized.

Therefore, the mandrel 1 is subjected to secondary force limiting by arranging the force limiting ring 5, and the stability of the mandrel assembly in locking is ensured; the force limiting and stopping function is realized by arranging a stop ring 3 and a torsion head 4 which are in threaded connection between the mandrel 1 and the mandrel head 6; therefore, the core shaft assembly of the retractor has the functions of two-stage force limitation and force limitation stopping, and the protection capability of the safety belt to passengers is improved.

it should be noted that the distance that the safety webbing can be pulled out can be controlled by adjusting the initial position at which the snap ring 3 is mounted on the male screw coupling portion 41 of the torque head 4 and adjusting the number of still-rotatable turns of the snap ring 3 and the spindle 1.

In one embodiment of the present application, preferably, as shown in fig. 4 and 10, a limiting groove 42 is provided on an end surface of the torque head 4 facing one end of the shaft head 6 along a radial direction thereof, and the limiting groove 42 penetrates through the torque head 4; the middle section 51 of the force limiting ring 5 is positioned in the limiting groove 42.

In this embodiment, a limiting groove 42 is formed on an end surface of one end of the torque head 4 facing the shaft head 6, the limiting groove 42 is arranged along a radial direction of the torque head 4, and the limiting groove 42 penetrates through side walls of two ends of the torque head 4 in the radial direction; so that the middle section 51 of the force limiting ring 5 can be placed in the limiting groove 42, and both ends of the middle section 51 penetrate through the torque head 4.

in one embodiment of the present application, preferably, as shown in fig. 10, the first pusher block 11 includes a first boss portion 13 and a first extension portion 14; the second pusher block 12 includes a second boss portion 15 and a second extension portion 16; the first boss portion 13 is disposed opposite to the second boss portion 15, and the first extension portion 14 is disposed opposite to the second extension portion 16.

In this embodiment, the first pusher block 11 includes a first boss portion 13 and a first extension portion 14, and the second pusher block 12 includes a second boss portion 15 and a second extension portion 16; the first boss portion 13 is disposed opposite to the second boss portion 15, and the first extension portion 14 is disposed opposite to the second extension portion 16; the first winding section 52 of the force limiting ring 5 is wound on the mandrel 1 around the outer sides of the first boss part 13 and the first extension part 14, the second winding section 53 is wound on the mandrel 1 around the outer sides of the second boss part 15 and the second extension part 16, and the middle section 51 is clamped on the torque head 4; when the mandrel component is locked, the torque head 4 is fixed, and the mandrel 1 and the torque head 4 rotate relatively, that is, the first pushing block 11 and the second pushing block 12 rotate relatively with the limiting groove 42, the first winding section 52 and the second winding section 53 deform under the pushing of the first pushing block 11 and the second pushing block 12 and are drawn out, and resistance is generated to the rotation of the mandrel 1; through setting up first extension 14 and second extension 16, increase limit for force ring 5 and be taken out the in-process and the frictional resistance of dabber 1, and then increase the power value of second grade limit for force, improve the stability of dabber subassembly when the locking.

in one embodiment of the present application, preferably, as shown in fig. 5 and 9, two limiting bosses 43 are oppositely arranged on an end surface of one end of the torque head 4 facing the shaft head 6, the two limiting bosses 43 are both fan-shaped, and a gap is formed between vertex angles of the two limiting bosses 43; the middle section 51 of the force limiting ring 5 passes through the torque head 4 through a gap and can abut against the two limiting bosses 43.

in this embodiment, the force-limiting ring 5 is connected with the torque head 4, and two limiting bosses 43 may be oppositely disposed on the end surface of one end of the torque head 4 facing the shaft head 6, the two limiting bosses 43 are both fan-shaped, the vertex angles of the fan-shaped bosses both face the center of the torque head 4, and a gap is formed between the vertex angles of the two limiting bosses 43; the middle section 51 of the force limiting ring 5 passes through the torque head 4 through the gap, and two ends of the middle section 51 can respectively abut against the side walls of the two limiting bosses 43.

the ends of the first winding section 52 and the second winding section 53 connected with the middle section 51 are the respective starting ends, and the other ends are the ending ends; in the initial position, the middle section 51 is located between the two limit bosses 43, and two ends of the middle section respectively abut against the side walls of the two limit bosses 43; the first pusher block 11 is located near the trailing end of the first winding section 52 and the second pusher block 12 is located at the trailing end of the second winding section 53. When the mandrel 1 and the torque head 4 rotate relatively, the first pushing block 11 and the second pushing block 12 also rotate along with the mandrel; first, the first pusher block 11 is rotated to the starting end of the first winding section 52, and the second pusher block 12 is rotated to the starting end of the second winding section 53; then, the force limiting ring 5 continues to rotate under the pushing of the first pushing block 11 and the second pushing block 12 until the two ends of the middle section 51 of the force limiting ring 5 abut against the two limiting bosses 43 respectively; then the mandrel 1 continues to rotate, the middle section 51 is abutted against the two limit bosses 43 and cannot continue to rotate, and under the continuous rotation and pushing of the first pushing block 11 and the second pushing block 12, the first winding section 52 and the second winding section 53 are deformed and drawn out, and generate resistance to the mandrel 1, so that secondary limit force to the mandrel 1 is formed.

In one embodiment of the present application, preferably, as shown in fig. 2, both ends of the torsion bar 2 are provided with splines, the end surface of the torque head 4 facing one end of the mandrel 1 is provided with a first key slot adapted to the splines, and the end of the mandrel 1 connected to the torsion bar 2 is provided with a second key slot adapted to the splines.

in this embodiment, both ends of the torsion bar 2 are provided with splines, one end of the torque head 4 facing the mandrel 1 is provided with a first key slot matched with the splines, the end of the mandrel 1 connected with the torsion bar 2 is provided with a second key slot, the torsion bar 2 is connected with the torque head 4 by inserting the splines at one end into the first key slot, and the splines at the other end are connected with the mandrel 1 by inserting the splines at the other end into the second key slot.

In one embodiment of the present application, preferably, as shown in fig. 3 and 4, the end surface of the spindle head 6 facing one end of the spindle 1 is provided with a connecting boss 61, and the connecting boss 61 is provided with a socket 62; the end face of one end, facing the shaft head 6, of the torsion head 4 is provided with a first inserting portion 45, and the torsion head 4 is inserted into the inserting port 62 through the first inserting portion 45 and is clamped with the shaft head 6.

in the embodiment, a connecting boss 61 is arranged on the end surface of one end of the spindle head 6 facing the spindle 1, and an inserting port 62 is arranged on the connecting boss 61; the end face of one end, facing the shaft head 6, of the torsion head 4 is provided with a first inserting portion 45, the first inserting portion 45 can be inserted into the connecting boss 61, so that the torsion head 4 and the shaft head 6 are connected in a clamped mode, and the torsion head 4 and the shaft head 6 can synchronously rotate or stop.

Preferably, two or more insertion ports 62 are formed on the connecting boss 61 of the shaft head 6 along the circumferential direction thereof, and correspondingly, two or more first insertion portions 45 are provided on the torque head 4, so that the torque head 4 and the shaft head 6 are stably and firmly clamped together by inserting the first insertion portions 45 into the corresponding insertion ports 62.

In one embodiment of the present application, it is preferable that the sidewall of the socket 62 is provided with a protrusion, as shown in fig. 3.

In this embodiment, the side walls on both sides of the insertion port 62 are provided with protrusions 63 facing the inside of the insertion port 62, the protrusions 63 are in the shape of a bar, and the bar-shaped protrusions 63 extend along the length direction of the connection boss 61; when the first mating part 45 is inserted into the mating opening 62, the protrusion 63 is squeezed therebetween; so that the first inserting portion 45 is tightly inserted into the inner portion of the inserting port 62 to firmly connect the shaft head 6 and the torque head 4 together.

In one embodiment of the present application, preferably, as shown in fig. 7 and 8, the outer wall of the snap ring 3 is provided with a second insertion part 32; one end of the mandrel 1 facing the shaft head 6 is provided with a first step part 18, and the side wall of the first step part 18 is provided with an inserting groove 17; the snap ring 3 can be placed in the first step 18 and the snap ring 3 is connected to the mandrel 1 by inserting the second insertion part 32 into the insertion groove 17.

In this embodiment, the end of the mandrel 1 facing the stub shaft 6 is provided with a first step 18, the snap ring 3 being able to be placed in the first step 18; the side wall of the first step part 18 is provided with an insertion groove 17, the outer wall of the corresponding stop ring 3 is also provided with a second insertion part 32, the stop ring 3 is inserted into the insertion groove 17 through the second insertion part 32, and the stop ring 3 is clamped on the mandrel 1, so that the mandrel 1 and the stop ring 3 can synchronously rotate or stop.

In one embodiment of the present application, preferably, as shown in fig. 1 and 12, the retractor spindle assembly further includes a ball wheel 8 and a bushing 7; the ball wheel 8 and the bushing 7 are positioned between the spindle head 6 and the spindle 1, one end of the ball wheel 8 is connected with the spindle head 6, and the other end of the ball wheel 8 is connected with the spindle 1; the connecting part and the first inserting part 45 are both positioned in the ball wheel 8 and are clamped with the ball wheel 8; a second step portion 71 is arranged in the bushing 7, and one end of the mandrel 1 facing the shaft head 6 can partially extend into the bushing 7 and abut against the second step portion 71.

In this embodiment, the retractor spindle assembly further comprises a ball wheel 8 and a bushing 7; the ball wheel 8 is positioned between the shaft head 6 and the mandrel 1, and the outer circumferential surface of the ball wheel 8 is provided with a plurality of semicircular grooves which are uniformly distributed along the circumferential direction and are used for connecting a driving piece; the ball wheel 8 is hollow to form a hollow cavity, and the connecting part of the shaft head 6 and the first inserting part 45 of the torsion head 4 are positioned in the hollow cavity; the spline groove has been seted up on the inner wall of cavity, is provided with the spline on the outer wall of the connecting portion of spindle nose 6 and the first grafting portion 45 of torsion head 4, installs back on the connecting portion of spindle nose 6 with the first grafting portion 45 of torsion head 4, can form a complete spline, this spline and the spline groove looks adaptation of cavity to be in the same place connecting portion and first grafting portion 45 and ball wheel 8 joint.

The shaft bushing 7 is positioned in the ball wheel 8, the shaft bushing 7 is positioned on one side of the ball wheel 8 facing the mandrel 1, a through hole is formed in the shaft bushing 7, and the shaft bushing 7 is perforated by the through hole through the connecting part of the shaft head 6 and the first inserting part 45 of the torsion head 4; after the spindle head 6, the ball wheel 8, the bushing 7 and the spindle 1 are installed, one end of the spindle 1 facing the spindle head 6 can abut against the second step part 71 of the bushing 7, so that the spindle 1 rotates more stably.

The application also provides a seat belt retractor comprising the retractor spindle assembly of any of the above embodiments.

In this embodiment, the seat belt retractor includes a retractor spindle assembly, and therefore the seat belt retractor has all the benefits of the retractor spindle assembly, which are not repeated herein.

finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled 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 invention.

Claims

1. a coiler mandrel component is characterized by comprising a mandrel, a torsion bar, a stop ring, a torsion head, a force limiting ring and a mandrel head;

One end of the torque head is connected with the shaft head, and the other end of the torque head is provided with an external thread connecting part;

the stop ring is positioned at one end of the mandrel, which faces the shaft head, and is connected with the mandrel; an internal thread connecting part matched with the external thread connecting part is arranged on the inner wall of the stop ring, and the stop ring is in threaded connection with the torque head;

A stopping part is arranged on the outer wall of the torque head, and when the stopping ring is screwed to the root part of the external thread connecting part, the stopping ring can abut against the stopping part;

The torsion bar is positioned in the mandrel, one end of the torsion bar is connected with the end part of the mandrel, and the other end of the torsion bar is connected with the shaft head through the torsion head;

The force limiting ring is positioned on the end face of one end, facing the spindle head, of the spindle and comprises a middle section, a first winding section and a second winding section, the first winding section is connected with one end of the middle section, the second winding section is connected with the other end of the middle section, and the first winding section and the second winding section extend and wind along a first direction; the middle section of the force limiting ring is positioned on the end face of one end, facing the shaft head, of the torsion head and is clamped with the torsion head;

A first pushing block and a second pushing block which are oppositely arranged are arranged on the end face of one end, facing the spindle head, of the spindle; the first winding section is wound along the outer side of the first pushing block, and the second winding section is wound along the outer side of the second pushing block, so that the force limiting ring is clamped on the mandrel.

2. The retractor mandrel assembly as claimed in claim 1, wherein a limiting groove is provided on an end surface of the torque head facing one end of the shaft head in a radial direction thereof, the limiting groove penetrating the end surface of the torque head; the middle section of the force limiting ring is clamped in the limiting groove.

3. the retractor spindle assembly as claimed in claim 2, wherein the first push block includes a first boss portion and a first extension portion; the second pushing block comprises a second boss part and a second extending part;

The first boss portion is arranged opposite to the second boss portion; one end of the first extending part is connected with the first boss part, and the other end of the first extending part extends along the first direction;

One end of the second extending portion is connected to the second boss portion, and the other end extends in the first direction.

4. The retractor mandrel assembly as claimed in claim 1, wherein two limit bosses are oppositely arranged on an end surface of one end of the torque head facing the shaft head, the two limit bosses are both fan-shaped, and a gap is formed between vertex angles of the two limit bosses;

The middle section of the force limiting ring penetrates through the torque head through the gap and can abut against the two limiting bosses.

5. The retractor mandrel assembly as claimed in claim 1, wherein splines are provided at both ends of the torsion bar, a first key groove adapted to the splines is provided on an end surface of the torsion head facing one end of the mandrel, and a second key groove adapted to the splines is provided on an end portion of the mandrel connected to the torsion bar.

6. The retractor mandrel assembly as claimed in claim 1, wherein a connection boss is provided on an end surface of one end of the mandrel head facing the mandrel, and an insertion port is provided on the connection boss;

The end face, facing one end of the shaft head, of the torsion head is provided with a first inserting portion, and the torsion head is inserted into the inserting port through the first inserting portion and is clamped with the shaft head.

7. the retractor spindle assembly as claimed in claim 6, wherein a projection is provided on a side wall of the socket.

8. The retractor spindle assembly as claimed in claim 1, wherein a second spigot portion is provided on an outer wall of the stop ring;

A first step part is arranged at one end of the mandrel facing the shaft head, and an inserting groove is formed in the side wall of the first step part;

The stop ring can be placed in the first step part, and the stop ring is inserted into the insertion groove through the second insertion part and is connected with the mandrel.

9. The retractor spindle assembly of claim 7 further comprising a ball wheel and a bushing;

the ball wheel is positioned between the spindle head and the spindle, one end of the ball wheel is connected with the spindle head, and the other end of the ball wheel is connected with the spindle;

the connecting part and the first inserting part are both positioned in the ball wheel and are clamped with the ball wheel;

the shaft bushing is positioned between the ball wheel and the core shaft, a second step part is arranged in the shaft bushing, and the core shaft faces one end of the shaft head and can partially extend into the shaft bushing and abut against the second step part.

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