CN113895393A

CN113895393A - Pawl type pretension termination retractor

Info

Publication number: CN113895393A
Application number: CN202111366038.7A
Authority: CN
Inventors: 胡波; 蒲志华; 雷于杨
Original assignee: CHONGQING GUANGDA INDUSTRIAL CO LTD
Current assignee: CHONGQING GUANGDA INDUSTRIAL CO LTD
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-01-07
Anticipated expiration: 2041-11-18
Also published as: CN113895393B

Abstract

The invention provides a pawl type pretension termination retractor, which comprises: the safety belt winding device comprises a moving shaft for winding a safety belt braid, a fixed shaft arranged at one end of the moving shaft, a ratchet ring gear and a pre-tightening wheel, wherein the ratchet ring gear and the pre-tightening wheel are sequentially sleeved on the fixed shaft along the axial direction; the fixed shaft comprises a disc-shaped part, a sleeve part is arranged on the end face, facing the moving shaft, of the disc-shaped part, and the pre-tightening wheel is firmly sleeved on the sleeve part; the joint of the sleeve part and the disc-shaped part forms an annular circular truncated cone, the ratchet ring is sleeved and supported on the circular truncated cone, and a pin is inserted between the ratchet ring and the circular truncated cone; the outer peripheral surface of the circular truncated cone is provided with a first inwards concave notch, the front end of the first notch is provided with a containing groove I capable of completely containing the pin, and the rear end of the first notch is provided with a containing groove II capable of partially containing the pin; and a corresponding second notch is formed on the inner wall of the hole of the ratchet ring gear, and the front end of the second notch is provided with a containing groove III capable of partially containing the pin. The invention has reliable termination of the pre-tightening function and can effectively prevent open fire.

Description

Pawl type pretension termination retractor

Technical Field

The invention relates to the technical field of safety belt retractors, in particular to a pawl type pre-tightening stopping retractor.

Background

The automobile safety belt is a safety device for restraining a passenger in a collision, avoiding secondary collision between the passenger and a steering wheel and an instrument panel in the collision or causing death and injury by rushing out of the automobile in the collision. The retractor is a core component of an automobile safety belt and is used for locking the safety belt webbing in an emergency.

At present, the retractors of a plurality of middle and high-end cars adopt pre-tightening retractors, namely, a pre-tightening device is installed in the retractors. The pretensioning device is used for eliminating redundant tensioning allowance of the safety belt. Particularly, run into the twinkling of an eye of collision in the car traveles, preloading device passes through collision sensor and detonates gas generator, promotes the spool pull-back safety meshbelt of coiler to bind the people on the seat, realize coiler pretension function.

In the prior art, the gas generator usually uses high-pressure gas generated by burning gunpowder as a thrust source. However, high-temperature combustible gas generated by the gas generator is easy to leak, and when the pre-tightening function of the retractor is activated, visible obvious flame appears, so that the safety of the automobile is threatened. Based on this, the applicant previously filed patent applications with publication numbers: 110481494A, title of invention: a pre-tightening type retractor for preventing open fire comprises a pre-tightening wheel and an elbow, wherein a pushing mechanism, a pre-tightening ball assembly, a stop ball assembly and a limiting mechanism are arranged in the elbow.

The above patent realizes the locking of the pre-tightening wheel by generating interference between the double-sphere limiting mechanism and the pre-tightening wheel to realize the termination of the pre-tightening function, so that the sealing ball is limited in the bent pipe (pre-tightening pipe), and further the sealing of high-temperature combustible gas in the bent pipe is realized. However, it still has drawbacks: the double-sphere limiting mechanism and the pre-tightening wheel are stopped through interference, the interference amount is limited, the stopping force is limited, stopping failure can be caused when the expansion of high-temperature gas exceeds a limit value, and when the pre-tightening wheel is stopped to fail, the sealing ball flies out of the pre-tightening pipe under the pushing of high-pressure gas, and the risk of fire fleeing occurs.

Therefore, it is an urgent technical problem for those skilled in the art to provide a pawl type pretension termination retractor with a novel structure to improve the locking force to the pretensioning wheel, so that the pretensioning wheel can be stably and reliably locked to completely prevent the occurrence of open fire.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a pawl type pre-tightening stopping retractor which is reliable in stopping a pre-tightening wheel and free of stopping failure.

In order to achieve the above object, the present invention provides a pawl-type pretension-termination retractor including: the safety belt winding device comprises a moving shaft for winding a safety belt braid, a fixed shaft arranged at one end of the moving shaft, a ratchet ring gear and a pre-tightening wheel, wherein the ratchet ring gear and the pre-tightening wheel are sequentially sleeved on the fixed shaft along the axial direction; it is characterized in that the preparation method is characterized in that,

the fixed shaft comprises a disc-shaped part, a sleeve part is arranged on the end face, facing the moving shaft, of the disc-shaped part, and the pre-tightening wheel is firmly sleeved on the sleeve part; the joint of the sleeve part and the disc part forms an annular circular truncated cone, the ratchet ring is sleeved and supported on the circular truncated cone, and a pin is inserted between the ratchet ring and the circular truncated cone;

the outer peripheral surface of the circular truncated cone is provided with a first inwards concave notch for accommodating the pin, the front end of the first notch is provided with an accommodating groove I capable of completely accommodating the pin along the positive rotation direction of the fixed shaft, and the rear end of the first notch is provided with an accommodating groove II capable of partially accommodating the pin;

and a corresponding second notch for accommodating the pin is formed on the inner wall of the hole of the ratchet ring gear, and the front end of the second notch is provided with an accommodating groove III capable of partially accommodating the pin along the positive rotation direction of the ratchet ring gear.

Further, the pawl-type pretension termination retractor includes: in a first state before the coiler pre-tightening function is started, the pin is completely accommodated in the accommodating groove I, and the accommodating groove I is positioned in front of the accommodating groove III;

the second state of the pre-tightening function is realized, wherein the pin is accommodated in the accommodating groove I and rotates along with the circular truncated cone of the fixed shaft to move towards the second notch;

and when the pin rotates to be in contact with the second notch, the pin enters the second notch under the action of centrifugal force and is finally blocked by the accommodating groove III at the front end of the second notch, and the circular truncated cone of the fixed shaft is blocked by the pin so as to stop the fixed shaft.

Further, the containing groove II can just contain the inner semicircle part of the pin.

Further, the containing groove III can just contain the outer semicircle part of the pin.

Further, the pawl pretensioned termination retractor further comprises a pretensioning tube having a first tube end in fluid communication with a gas generator and an outlet aligned with the pretensioning wheel; the pre-tightening pipe is provided with a plurality of driving balls and at least one sealing ball between an outlet of the pre-tightening pipe and a first pipe end;

in response to the actuation of the gas generator, the plurality of driving balls and the at least one sealing ball move towards the outlet of the pre-tightening pipe, and the plurality of driving balls are meshed with the pre-tightening wheel after flying out of the pre-tightening pipe to drive the pre-tightening wheel to rotate.

Furthermore, the head ends of the plurality of driving balls of the pre-tightening pipe are provided with guide balls.

Further, the pawl type pretension termination retractor further comprises a stop pawl which is rotatably arranged in the retractor and used for clamping the ratchet ring gear at the moment when the retractor pretension function is activated.

Furthermore, a positioning pin is inserted into the guide ball and is matched with the stopping pawl to normally prevent the stopping pawl from contacting with the ratchet of the ratchet ring.

Further, the pawl comprises a rotary disk which is rotatably arranged in the retractor, a clamping arm which is connected to the periphery of the rotary disk and used for clamping the ratchet ring gear, and a positioning arm which is connected to the periphery of the rotary disk, used for abutting against the positioning pin and used for keeping the rotary disk static in a normal state.

Furthermore, the pawl further comprises a driving arm connected to the circumferential direction of the rotary disk, a driving spring is connected to the rear end face of the driving arm, the driving spring always has a tendency of driving the clamping arm to be clamped with the ratchet ring, and after the positioning pin is separated from the positioning arm, the clamping arm is clamped with the ratchet of the ratchet ring under the elastic force action of the driving spring.

The invention has the following beneficial effects:

the pawl type pretension stopping retractor provided by the invention is abutted between the circular truncated cone of the fixed shaft and the ratchet ring in the circumferential direction through the pin, so that the fixed shaft is reliably stopped, and the pretension wheel is reliably stopped. Compared with the prior art which depends on interference stopping, the gas generator stopping device is reliable in stopping, and the phenomenon of stopping failure cannot occur, so that the sealing ball can be always limited in the pre-tightening pipe to seal high-temperature combustible gas generated by explosion of the gas generator, and open fire is effectively prevented from escaping.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is an overall appearance of a pawl-type pretension termination retractor according to the present invention;

FIG. 2 is an exploded view of the pawl pretension termination retractor shown in FIG. 1;

FIG. 3 is a schematic structural diagram of the movable shaft, the fixed shaft, the ratchet ring gear and the pre-tightening wheel assembled together;

FIG. 4 is an exploded view of FIG. 3;

FIG. 5 is a schematic view (semi-section of the fixed shaft) of the internal structure of the fixed shaft ratchet ring gear assembly;

FIG. 6 is a schematic view of the structure of the fixed shaft;

FIG. 7 is a schematic view of the ratchet ring;

FIG. 8 is a schematic view of a pawl-type pretension termination retractor according to the present invention in a first state prior to initiation of a pretensioning function;

FIG. 9 is a schematic view of a pawl-type pretension termination retractor according to the present invention in a second state during the pretensioning function;

FIG. 10 is a schematic cross-sectional view of FIG. 9;

FIG. 11 is a schematic view of a pawl-type pretension termination retractor according to the present invention in a third state in which the pretensioning function is terminated;

FIG. 12 is a schematic cross-sectional view of FIG. 11;

FIG. 13 is a schematic view of the ratchet ring engaged with the pawl;

FIG. 14 is a schematic illustration of a pawl pretensioned termination retractor according to the present invention in its normal state (shown with the pretensioning tube);

FIG. 15 is a schematic illustration of a pawl-type pretension termination retractor according to the present invention in the process of pretensioning (pretensioning tube shown);

drawing reference numerals

1-moving shaft; 2-fixing the shaft; 2 a-a disk-shaped portion; 2 b-a sleeve portion; 2 c-a circular truncated cone; 3-ratchet ring; 4-a pre-tightening wheel; 5-a force limiting rod; 6-pin; 7-a scaffold; 8-a first notch; 8 a-vessel I; 8 b-vessel II; 9-a second notch; 9 a-vessel III; 10-pawl; 10 a-a turn disc; 10 b-a snap-fit arm; 10 c-a positioning arm; 10 d-a drive arm; 11-pre-tensioning the tube; 11 a-a first tube end; 11 b-an outlet; 12-a drive ball; 13-a guide ball; 14-a locating pin; 15-a spring; 16-gas generator.

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present application more clearly understood, the following further detailed description of the embodiments of the present application with reference to the drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not an exhaustive list of all the embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Figure 1 shows an overall external view of a pawl-type pretension termination retractor according to the present invention; FIG. 2 is an exploded view of the pawl pretension termination retractor shown in FIG. 1; fig. 3 is a schematic structural diagram of the movable shaft 1, the fixed shaft 2, the ratchet ring gear 3 and the pre-tightening wheel 4 assembled together; fig. 4 is an exploded view of fig. 3.

As shown in fig. 3 and 4, the present invention discloses a pawl type pretension termination retractor, which comprises a moving shaft 1 for winding a webbing, and a fixed shaft 2 mounted at one end of the moving shaft 1. The moving shaft 1 is connected with the fixed shaft 2 through a force limiting rod 5, specifically, one end of the force limiting rod 5 extends into the moving shaft 1 and is fixedly connected with the moving shaft 1, the other end of the force limiting rod 5 extends into the fixed shaft 2 and is fixedly connected with the fixed shaft 2, and the moving shaft 1 is rotatably mounted on a retractor bracket 7 (shown in figure 2). In a normal state, the movable shaft 1 can rotate freely, so that the seat belt webbing is tightened or released, and a certain degree of freedom is provided for a passenger. Because the fixed shaft 2 is fixedly connected with the movable shaft 1 through the force limiting rod 7, when the movable shaft 1 rotates to wind the belt webbing, the fixed shaft 2 rotates together with the movable shaft 1.

As shown in fig. 4, the fixed shaft 2 includes a disk-shaped portion 2a, a sleeve portion 2b is provided on an end surface of the disk-shaped portion 2a facing the moving shaft 1, and an annular circular truncated cone 2c is formed where the sleeve portion 2b is connected to the disk-shaped portion 2 a.

As shown in fig. 3 and 4, the ratchet type pretension stopping retractor provided by the invention further comprises a pretension wheel 4 and a ratchet ring gear 3 which are sequentially sleeved on the fixed shaft 2 along the axial direction. Specifically, the ratchet ring gear 3 is sleeved on the annular circular truncated cone 2c of the fixed shaft 2, a pin 6 is inserted between the ratchet ring gear 3 and the circular truncated cone 2c of the fixed shaft, and the pre-tightening wheel 4 is fixedly sleeved on the sleeve part 2b of the fixed shaft 2 through a key connection.

FIG. 5 shows a schematic view of the internal structure of the assembly of the fixed shaft 2 with the ratchet ring 3 (the disc-shaped portion 2a of the fixed shaft 2 is half-sectioned); fig. 6 shows a schematic structural view of the fixed shaft 2; fig. 7 shows a schematic structural view of the ratchet ring 3.

As shown in fig. 5 to 7, the outer peripheral surface of the fixed-axis annular truncated cone 2c is formed with a first recess 8 recessed inward for receiving the pin 6. In the normal rotation direction of the fixed shaft 2 (the normal rotation direction indicates the winding direction of the shaft 1 to take up the webbing, i.e., the clockwise direction shown by the arrow in fig. 5), the front end of the first notch 8 has a receiving groove i 8a that can completely receive the stud 6, and the rear end of the first notch 8 has a receiving groove ii 8b that can partially receive the stud 6. The inner wall of the hole of the ratchet ring gear 3 is provided with a corresponding second notch 9 for accommodating the pin 6, and the front end of the second notch 9 is provided with an accommodating groove III 9a capable of partially accommodating the pin 6 along the positive rotation direction of the ratchet ring gear 3.

Referring to fig. 8, fig. 8 illustrates a first state of a pawl-type pretension-terminated retractor according to the present invention before the pretensioning function is activated.

The pawl type pretension stopping retractor provided by the invention has a first state (namely a normal state) before the retractor pretensioning function is started, wherein the pin 6 is completely accommodated in the accommodating groove I8 a of the fixed shaft circular truncated cone 2c, and the accommodating groove I8 a is positioned in front of the accommodating groove III 9a of the ratchet ring gear 3. At this time, the stopper pawl 10 of the retractor is not in contact with the ratchet of the ratchet ring gear 3, and the movable shaft, the fixed shaft 2, the pretensioner 3, and the ratchet ring gear 4 are assembled into an integrated reel assembly that can freely rotate (forward or reverse), thereby tightening or loosening the webbing and giving the occupant a degree of freedom.

Referring to fig. 5, fig. 5 is a schematic view showing a state of the pawl type pretension stopping retractor provided by the present invention at the instant of starting the pretensioning function. At the moment of collision of the automobile, the stopping pawl 10 moves to be in contact with the ratchet of the ratchet ring gear 3 to block the ratchet ring gear 3, so that the ratchet ring gear 3 is stopped.

Referring to fig. 9 and 10, fig. 9 is a schematic diagram illustrating a second state of the pawl-type pretension stopping retractor according to the present invention in a process of implementing a pretensioning function; fig. 10 is a schematic cross-sectional view of fig. 9.

As shown in fig. 9 and 10, the pawl type pretension termination retractor of the present invention has a second state that realizes a pretensioning function, when an automobile collides, the pretensioning function of the pawl type pretension termination retractor is activated, the pawl 10 moves to contact with the ratchet of the ratchet ring gear 3 to block the ratchet ring gear 3, and the ratchet ring gear 3 is stopped. At this time, the pretensioner 4 can rotate in the forward direction in response to actuation of the pretensioner, and the forward rotation of the pretensioner 4 rotates the movable shaft 1 and the fixed shaft 2 in the forward direction. Since the ratchet ring gear 3 is stopped, the fixed shaft 2 rotates in the forward direction relative to the ratchet ring gear 3, and the pin 6 is accommodated in the accommodating groove I8 a and rotates in the forward direction along with the fixed shaft 2. At this time, the moving shaft 1 can rotate forward along with the pre-tightening wheel 4, so that the seat belt webbing can be tightened, and the passenger is tightened by the seat belt webbing and fixed on the seat, namely, the pre-tightening function of the retractor is realized.

Figure 11 is a schematic view of a ratchet-type pretension termination retractor according to the present invention in a third state in which the pretensioning function is terminated;

fig. 12 is a cross-sectional view of fig. 11.

As shown in fig. 11 and 12, the pawl type pretension stopping retractor according to the present invention has a third state in which the pretensioning function is stopped, when the stud 6 rotates clockwise to contact with the second notch 9 on the ratchet ring 3, under the action of centrifugal force, the stud 6 enters the second notch 9 of the ratchet ring 3 and is finally blocked by the receiving groove iii 9a at the front end of the second notch 9, and then the annular truncated cone 2c of the fixed shaft 2 is blocked by the stud 6, that is, the fixed shaft 2 cannot rotate forward, so that the pretensioning wheel 4 is stopped (the pretensioning wheel 4 is connected with the fixed shaft 2 in a key manner), thereby stopping the pretensioning function.

It will be appreciated that when the pre-tightening function of the retractor is terminated, the stud 6 will reliably stop the fixed shaft 2, and thus the pre-tightening wheel 4, by abutting circumferentially between the truncated cone 2c of the fixed shaft 2 and the ratchet ring 3. Compared with the prior art which relies on interference for stopping, the invention has reliable stopping and can not generate the phenomenon of stopping failure.

Preferably, the receiving groove ii 8b is configured to be just capable of receiving a semicircular part of the pin 6, and the receiving groove iii 9a is also configured to be just capable of receiving a semicircular part of the pin. As shown in fig. 11, when the pre-tightening function is terminated, the inner semi-circular portion of the pin 6 is just received in the receiving groove ii 8b of the fixed shaft 2, and the outer circular portion of the pin 6 is just received in the receiving groove iii 9a of the gear ring 3, so that the pin 6 firmly abuts between the circular truncated cone 2c of the fixed shaft and the ratchet-toothed ring 3.

Referring to fig. 14, fig. 14 shows a schematic diagram of the engagement of the pretensioning tube 11 and the pretensioning wheel 4.

Further, the pawl-type pretension stopping retractor provided by the invention also comprises a pretensioning pipe 11 which is provided with a first pipe end 11a communicated with the gas generator 16 in a fluid mode and an outlet 11b aligned with the pretensioning wheel 4. The pre-tensioned pipe 11 is provided with a plurality of drive balls 12 and at least one sealing ball (not shown) between its outlet 11b and the first pipe end 11 a.

When a collision accident occurs, fluid generated by detonation of the gas generator 12 rapidly expands in the pre-tightening pipe, the plurality of driving balls 12 and the at least one sealing ball move towards the outlet 11b of the pre-tightening pipe in response to the actuation of the gas generator 12, the plurality of driving balls fly out of the pre-tightening pipe 11 and then are meshed with the pre-tightening wheel 4 to impact the pre-tightening wheel, in response to the impact of the driving balls, the pre-tightening wheel 4 rotates in the forward direction to drive the fixed shaft 2 to rotate in the forward direction, the fixed shaft 2 rotates to drive the movable shaft 1 to rotate, and the movable shaft 1 rotates to wind and tighten the belt webbing, so that the pre-tightening function is realized.

It is easy to understand that, because the locking of the pre-tightening wheel 4 is reliable through the pin 6, when the pre-tightening function is terminated, the sealing ball in the pre-tightening pipe cannot fly out of the pre-tightening pipe due to the locking failure, namely, the sealing ball is always limited in the pre-tightening pipe 11 and is used for sealing high-temperature combustible gas in the pre-tightening pipe, so that open fire is prevented from escaping out of the pre-tightening pipe 11.

Further, a guide ball 13 is arranged at the head end position of the pre-tightening pipe 11, in response to the actuation of the gas generator 12, the guide ball 13 can fly out of the outlet of the pre-tightening pipe 11 and can be quickly and accurately engaged with the pre-tightening wheel 4, and the guide ball 13 is arranged at the front end of the driving ball 12 and used for guiding the driving ball 12 in the pre-tightening pipe.

Fig. 13 shows a schematic view of the engagement of the pawl 10 with the ratchet ring 3.

As shown in fig. 13, a stopping pawl 10 of the retractor is rotatably provided in the retractor for catching the ratchet ring 3 at the moment when the retractor pretensioning function is activated.

As shown in fig. 14, a positioning pin 14 is inserted on the guide ball 13, and the positioning pin 14 is engaged with the stopping pawl 10 for normally preventing the stopping pawl 10 from contacting with the ratchet teeth of the ratchet ring gear 3.

The pawl 10 includes a rotary disk 10a rotatably provided in the retractor, a catching arm 10b attached to a circumferential direction of the rotary disk 10a for catching the ratchet ring, and a positioning arm 10c attached to the circumferential direction of the rotary disk 10a for abutting against a positioning pin 14 for normally keeping the rotary disk stationary. The pawl further comprises a driving arm 10d connected to the circumferential direction of the rotary disk 10a, a driving spring 15 is connected to the rear end face of the driving arm 10d, and the driving spring 15 always tends to drive the clamping arm 10b to be clamped with the ratchet ring gear 3.

The pretensioning process of the pawl-type pretensioning termination retractor provided by the invention is wholly explained below.

Referring to fig. 14, fig. 14 shows a schematic view of a pawl-type pretension-terminated retractor according to the present invention in a normal state (pretension tube shown).

Under the normal state, the pretensioning function of the retractor is not activated, the positioning pin 14 on the guide ball 13 limits the pawl 10, so that the pawl 10 is not contacted with the ratchet of the ratchet ring gear 3, the movable shaft 1 can freely rotate forwards and backwards, the seat belt webbing can be tightened or released, and a certain degree of freedom is provided for passengers.

Referring to fig. 15, fig. 15 shows a schematic diagram of a pawl-type pretension-terminated retractor according to the present invention during pretensioning.

When the automobile is collided, the furled pretensioning function is activated, the guide ball 13 flies out of the outlet of the pretensioning pipe in response to the activation of the gas generator, the positioning pin 14 on the guide ball is separated from the pawl 10, and the pawl 10 rotates to be matched with the ratchet of the ratchet ring gear 3 under the action of the elastic force of the driving spring 15 so as to stop the ratchet ring gear. The pin 6 is then moved in the manner described above to effect locking of the pretensioning wheel and thereby termination of the pretensioning function.

In conclusion, the pawl type pretension termination retractor with the novel structure is designed, the pretension function is terminated reliably, the phenomenon of stop failure of the pretension wheel cannot occur, so that the sealing ball can be always limited in the pretension pipe, high-temperature combustible gas generated by the gas generator is completely sealed in the pretension pipe, and open fire is prevented from escaping.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A pawl pretension termination retractor comprising: the safety belt winding device comprises a moving shaft for winding a safety belt braid, a fixed shaft arranged at one end of the moving shaft, a ratchet ring gear and a pre-tightening wheel, wherein the ratchet ring gear and the pre-tightening wheel are sequentially sleeved on the fixed shaft along the axial direction; it is characterized in that the preparation method is characterized in that,

2. A pawl-type pretension termination retractor according to claim 1, characterized in that said pawl-type pretension termination retractor has: in a first state before the coiler pre-tightening function is started, the pin is completely accommodated in the accommodating groove I, and the accommodating groove I is positioned in front of the accommodating groove III;

3. The pawl pretensioned termination retractor according to claim 2 wherein the pocket ii is adapted to receive just a semi-circular portion of the stud.

4. A pawl-type pretensioned termination retractor according to claim 3, wherein the pocket iii is also adapted to snugly receive a semi-circular portion of the stud.

5. A pawl-type pretensioned termination retractor according to claim 1 further comprising a pretensioning tube having a first tube end in fluid communication with a gas generator and an outlet aligned with the pretensioning wheel; the pre-tightening pipe is provided with a plurality of driving balls and at least one sealing ball between an outlet of the pre-tightening pipe and a first pipe end;

6. The pawl type pretensioned termination retractor according to claim 5, wherein the pretensioned tube is provided with a guide ball at a head end of the plurality of driving balls.

7. The pawl pretension termination retractor according to claim 6, further comprising a stopping pawl rotatably disposed in the retractor for catching the ratchet ring at the instant when the retractor pretension function is activated.

8. The pawl-type pretensioned termination retractor according to claim 7, wherein a positioning pin is inserted on the guide ball, the positioning pin cooperating with the stopping pawl for normally preventing the stopping pawl from contacting the ratchet teeth of the ratchet ring gear.

9. The pawl-type pretensioned termination retractor according to claim 8, wherein the pawl includes a rotary disk rotatably provided in the retractor, a catching arm connected to a circumferential direction of the rotary disk and adapted to catch the ratchet ring, and a positioning arm connected to a circumferential direction of the rotary disk and adapted to abut against the positioning pin and adapted to keep the rotary disk stationary in a normal state.

10. The pawl-type pretension termination retractor according to claim 9, wherein the pawl further comprises a driving arm connected to the circumferential direction of the rotating disk, and a driving spring is connected to a rear end surface of the driving arm, the driving spring always has a tendency to drive the engagement arm to engage with the ratchet ring, and after the positioning pin is disengaged from the positioning arm, the engagement arm engages with the ratchet of the ratchet ring under the elastic force of the driving spring.