JP7324651B2 - Pretensioners, retractors and seatbelt devices - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pretensioner, a retractor, and a seatbelt device, and more particularly to a pretensioner, a retractor, and a seatbelt device suitable for a configuration including a power transmission member made of resin.

2. Description of the Related Art A vehicle such as an automobile is generally provided with a seat belt device for restraining an occupant in a seat having a seat on which the occupant sits and a backrest portion positioned on the back of the occupant. Such a seatbelt device includes a webbing for restraining an occupant, a retractor for winding up the webbing, a buckle arranged on the side of the seat, and a tongue arranged on the webbing, and the tongue is fitted to the buckle. The webbing restrains the occupant to the seat. Moreover, the retractor generally has a pretensioner that removes slack in the webbing in an emergency such as a vehicle collision.

Such a pretensioner includes a power transmission member that rotates a spool that winds up webbing, an elongated cylindrical pipe (guide member) that guides the power transmission member, and a working gas supplied to the pipe to generate power. and a gas generator that applies a driving force to the transmission member (see, for example, Patent Document 1).

As described in Patent Document 1, when the power transmission member is completely discharged from the pipe when the pretensioner is actuated, the working gas may be released to the outside, generating noise and smoke. Therefore, Japanese Patent Laid-Open No. 2002-200002 proposes various means for closing the final section of the pipe with a power transmission member (mass or drive cylinder) so that the working gas is not discharged to the outside of the pipe.

By the way, in recent years, research and development have been made on using an elongated rod-shaped part made of resin as a power transmission member of a pretensioner. For example, Patent Document 2 discloses a configuration in which a piston provided with a reduction element and a sealing element contacts a stopper formed inside a pipe, and the piston is stopped within the pipe by plastically deforming the stopper with the reduction element. disclosed.

Japanese Patent No. 4654204 Japanese Patent Publication No. 2016-523198

The closing means described in Patent Document 1 is based on the premise that the power transmission member is a plurality of spherical mass bodies made of metal. The mass body described in Patent Document 1 is made of metal, which is a material that is difficult to deform. I have. Therefore, the closing means described in Patent Document 1 is not necessarily suitable for a pretensioner having a power transmission member made of resin.

In addition, since the pipe, which is a guide member for the power transmission member, is a pressure vessel that encloses the working gas while smoothly pushing out the power transmission member, the inner diameter of the pipe is required to have high manufacturing accuracy. However, in the invention described in Patent Document 2, since the stopper is formed inside the pipe (guide member) away from the entrance and exit, there is a problem that it is difficult to control the accuracy of the inner diameter.

The present invention has been devised in view of such problems, and a pretensioner, a retractor, and a seatbelt device capable of suppressing the release of the working gas to the outside and facilitating precision control of the inner diameter of the guide member. intended to provide

According to the present invention, in a pretensioner including a ring gear connected to a spool for winding webbing that restrains an occupant, and a power transmission device that transmits power to the ring gear in an emergency, the power transmission device includes a resin rod-shaped power transmission member that transmits power to the ring gear, a cylindrical guide member that guides the power transmission member to the ring gear, and a working gas that is supplied to the interior of the guide member. a gas generator, a stopper disposed between the gas generator and the power transmission member, and a restraining portion formed on the guide member to restrain the stopper, wherein the stopper is attached to the guide member. The restricting portion has a shape elongated in the axial direction, and the restricting portion is configured to restrict the axis of the stopper while being inclined with respect to the axis of the guide member. a protrusion that protrudes inward from a member; and an opening that forms a space that allows for a change in posture that occurs when the stopper collides with the protrusion, wherein the stopper is a diameter of the power transmission member. A pretensioner is provided, characterized in that it has a lateral width that is greater than its directional width .

The opening may be formed opposite to the protrusion.

The protrusion may be configured to be able to pass through the power transmission member in the axial direction of the guide member.

A distance between the upper end or the lower end of the opening and the apex of the protrusion may be formed to be larger than the lateral width of the stopper.

The restricting portion may include a sealing member arranged to close the opening.

The stopper may be configured to be plastically deformable when it collides with the protrusion or the edge of the opening.

The power transmission device may include a piston arranged between the stopper and the gas generator.

Further, according to the present invention, there is provided a retractor comprising the pretensioner having the above configuration.

Further, according to the present invention, there is provided a seatbelt device having a retractor having the pretensioner having the configuration described above.

According to the pretensioner, retractor, and seatbelt device according to the present invention described above, since the stopper is restrained by inclining the axial center of the stopper within the guide member, the stopper is not released from the guide member. , the release of the working gas to the outside can be suppressed.

In addition, accuracy control of the inner diameter of the guide member can be performed by passing a sphere having the same diameter as the diameter of the power transmission member from the inlet to the outlet of the guide member. can be easily done.

1 is an exploded view of parts showing a retractor according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view showing the operation of the pretensioner shown in FIG. 1, where (A) is the state before operation, (B) is the state in which the stopper collides with the protrusion, and (C) is the state in which the stopper is restrained. showing. FIG. 4 is an explanatory view showing a method of restraining a stopper, (A) is a cross-sectional view of the stopper, (B) is an enlarged cross-sectional view of the restraining portion, and (C) is an enlarged cross-sectional view of the stopper restrained by the restraining portion. be. It is sectional drawing which shows the modification of a stopper, (A) has shown the 1st modification, (B) has shown the 2nd modification, and (C) has shown the 3rd modification. It is sectional drawing which shows the modification of a restraint part, (A) is a 1st modification, (B) is a 2nd modification, (C) is a 3rd modification, (D) 4th modification, (E) A fifth modification is shown. 1 is an overall configuration diagram showing a seatbelt device according to an embodiment of the present invention; FIG.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6. FIG. Here, FIG. 1 is an exploded view of parts showing a retractor according to one embodiment of the present invention. 2A and 2B are cross-sectional views showing the operation of the pretensioner shown in FIG. 1, in which (A) is the state before operation, (B) is the state in which the stopper collides with the protrusion, and (C) is the stopper restrained. state, showing. 3A and 3B are explanatory diagrams showing a method of restraining the stopper, in which (A) is a cross-sectional view of the stopper, (B) is an enlarged cross-sectional view of the restraining portion, and (C) is an enlarged view of the stopper restrained by the restraining portion. A cross-sectional view.

As shown in FIG. 1, the retractor 1 according to the first embodiment of the present invention includes a spool 2 that winds up a webbing that restrains an occupant, and a pretensioner 3 that winds up the webbing to remove slack in an emergency. , and the pretensioner 3 includes a ring gear 31 connected to the spool 2 and a power transmission device 32 that transmits power to the ring gear 31 in an emergency. In addition, in FIG. 1, the illustration of the webbing is omitted.

The power transmission device 32 includes, for example, a resin rod-shaped power transmission member 32a that transmits power to the ring gear 31, a cylindrical guide member 32b that guides the power transmission member 32a to the ring gear 31, and a guide member 32b. A gas generator 32c that supplies working gas to the inside of the gas generator 32c, a stopper 32d that is arranged between the gas generator 32c and the power transmission member 32a, and a piston 32e that is arranged between the stopper 32d and the gas generator 32c , a guide member 32f that supports the power transmission member 32a when the power transmission member 32a and the ring gear 31 start meshing, and a restraining portion 32g that is formed in the guide member 32b and restrains the stopper 32d.

The spool 2 is a winding drum for winding webbing, and is rotatably housed in a base frame 11 that forms the framework of the retractor 1 . The base frame 11 has, for example, a first end surface 111 and a second end surface 112 facing each other, and a side surface 113 connecting these end surfaces. The base frame 11 may include a tie plate 114 facing the side surfaces 113 and connected to the first end surface 111 and the second end surface 112 .

Further, for example, the spring unit 4 is arranged on the first end surface 111 side, and the pretensioner 3 and the lock mechanism 5 are arranged on the second end surface 112 side. The arrangement of the spring unit 4, pretensioner 3, lock mechanism 5, etc. is not limited to the illustrated configuration.

The first end face 111 of the base frame 11 is formed with an opening 111a through which the shaft of the spool 2 is inserted, and the second end face 112 of the base frame 11 is provided with a pawl (not shown) of the lock mechanism 5. ) are formed with internal teeth engagable therewith. A part of the pretensioner 3 (for example, the ring gear 31 ) is arranged inside the second end surface 112 of the base frame 11 . Further, the lock mechanism 5 is arranged outside the second end surface 112 of the base frame 11 and is housed inside the retainer cover 51 .

A vehicle sensor 6 for detecting sudden deceleration or inclination of the vehicle body may be arranged on the retainer cover 51 . The vehicle sensor 6 has, for example, a spherical mass body (not shown) and a sensor lever (not shown) that is swung by movement of the mass body. The vehicle sensor 6 is fixed by being fitted into an opening 112b formed in the second end surface 112 of the base frame 11 .

The spool 2 may have a cavity in the center and a torsion bar 21 forming an axis may be inserted therethrough. The torsion bar 21 has a first end connected to a locking base 52 of the locking mechanism 5 connected to the end of the spool 2 and a second end fixed to the spool 2 and a spring core of the spring unit 4 . It is connected to the. Therefore, the spool 2 is connected to the spring unit 4 via the locking base 52 and the torsion bar 21, and is urged in the webbing winding direction by the spiral spring housed in the spring unit 4. As shown in FIG.

The means for applying the winding force to the spool 2 is not limited to the spring unit 4, and other means using an electric motor or the like may be used.

The locking base 52 has a pawl (not shown) arranged so as to be retractable from its side surface. When the locking mechanism 5 is actuated, the pawl protrudes from the side surface of the locking base 52 and is engaged with the internal teeth formed in the opening 112a of the base frame 11, thereby restraining the rotation of the locking base 52 in the webbing pull-out direction. do.

Therefore, even if a load is applied in the webbing pull-out direction while the lock mechanism 5 is actuated, the spool 2 can be held in a non-rotating state until a load equal to or greater than the threshold is applied to the torsion bar 21. can. When a load equal to or greater than a threshold is applied to the torsion bar 21, the torsion bar 21 is twisted, causing the spool 2 to relatively rotate and the webbing to be pulled out.

The lock mechanism 5 also includes a lock gear 53 arranged adjacent to the locking base 52 . The lock gear 53 has a flywheel (not shown) which is arranged to be able to swing. engages the internal teeth. Also, when the vehicle sensor 6 is actuated, the sensor lever engages with external teeth formed on the side surface of the lock gear 53 .

Thus, the rotation of the lock gear 53 is restricted by the operation of the flywheel or vehicle sensor 6 . When the rotation of the lock gear 53 is restricted, relative rotation occurs between the locking base 52 and the lock gear 53 , and the pawl protrudes from the side surface of the locking base 52 with this relative rotation.

It should be noted that the lock mechanism 5 is not limited to the configuration shown in the drawings, and can be used by arbitrarily selecting from various conventional configurations. Further, instead of the torsion bar 21, the spool 2 may be provided with an impact absorbing mechanism constituted by a combination of a shaft and a wire-like or plate-like plastic deformation member.

The pretensioner 3 includes, for example, a ring gear 31 having engagement teeth on its outer circumference, a power transmission device 32, a pretensioner cover 33 that stores the ring gear 31, and a guide spacer that forms a movement space for the power transmission member 32a. 34 and .

The ring gear 31 is arranged so as to be located in the space between the pretensioner cover 33 secured by the guide spacer 34 and the base frame 11 (second end surface 112). Note that the ring gear 31 may also be referred to as a driving wheel or rotating member.

The pretensioner cover 33 and the guide spacer 34 are arranged inside the second end surface 112 of the base frame 11 , and the guide spacer 34 is housed inside the pretensioner cover 33 . Also, the pretensioner cover 33 is fixed to the base frame 11 (second end face 112) together with or directly to the guide member 32b and the guide spacer 34 by fixing pins 33a, 33b, and 33c, for example.

In the power transmission device 32, for example, a gas generator 32c, a piston 32e, a stopper 32d, and a power transmission member 32a are arranged in this order from the rear end to the front end of a guide member 32b formed of a cylindrical pipe. The power transmission member 32a, the stopper 32d, and the piston 32e are accommodated within the guide member 32b, and are moved within the guide member 32b by working gas generated from a gas generator 32c arranged at the rear end of the guide member 32b.

The power transmission member 32a is formed in a rod shape having a linear shape before it is inserted into the guide member 32b. In addition, it is housed inside along the shape of the guide member 32b.

The guide member 32b, for example, as shown in FIG. It has a curved shape extending downward from the upper part inside the part.

A guide member 32f is arranged at the tip of the guide member 32b. Further, at the tip of the guide member 32b, a first opening 32h is formed through which the power transmission member 32a guided by the guide member 32f is released from the guide member 32b into the space formed by the pretensioner cover 33 and the guide spacer 34. It is In addition, the guide member 32b includes a first notch portion 32i that communicates from the tip portion of the guide member 32b to the first opening portion 32h, and a first insertion portion that inserts a fixing pin 33a formed below the first opening portion 32h. and a hole 32j.

The first opening 32h is formed at a position adjacent to the guide member 32f of the guide member 32b, and constitutes the outlet of the power transmission member 32a. Further, the first notch portion 32i has a function of positioning the guide member 32f in the circumferential direction, and the projection portion of the guide member 32f is inserted into the first notch portion 32i.

For example, as shown in FIGS. 1 and 2A, the guide member 32f has a substantially cylindrical shape that can be inserted into the tip of the guide member 32b, and the power transmission member 32a is attached to the end on the insertion side. A sliding surface 32k that guides to the first opening 32h is obliquely formed. The sliding surface 32k may have a curved groove shape along the outer shape of the power transmission member 32a.

A notch portion 32m through which the fixing pin 33a is inserted is formed in the lower portion of the sliding surface 32k. Further, a bolt hole 32o for screwing a bolt 32n for fixing the guide member 32f and the guide member 32b to the base frame 11 (side surface 113) is formed on the rear side of the sliding surface 32k. 2A to 2C, the illustration of the bolt 32n is omitted for convenience of explanation.

32 g of restraint parts are parts which let the power transmission member 32a pass, and stop the stopper 32d within the guide member 32b. For example, as shown in FIG. 3B, the restraining portion 32g is capable of allowing a change in posture that occurs when a protrusion 32p protruding inside the guide member 32b and the stopper 32d collide with the protrusion 32p. and an opening 32q forming a space.

The projecting portion 32p is formed, for example, by pressing a portion of the outer circumference of the guide member 32b. The opening 32q is formed, for example, by cutting off part of the outer periphery of the guide member 32b. The shapes of the protrusion 32p and the opening 32q are not limited to the illustrated shapes.

The stopper 32d is, for example, a substantially cylindrical metal part as shown in FIG. 3(A). The stopper 32d may have recesses at the front end and the rear end, or may have an annular recess on the outer periphery of the intermediate portion.

The stopper 32d also has a lateral width (that is, a diameter) φ that can be inserted into the guide member 32b, and an axial length H in the axial direction of the guide member 32b. The stopper 32d has a shape elongated in the axial direction of the guide member 32b, and has a relationship of axial length H>lateral width φ. Further, the lateral width φ is formed to be larger than the radial width of the power transmission member 32a so as to easily collide with the protrusion 32p.

As shown in FIG. 3B, if the inner corner of the upper end of the opening 32q is P, and the inner corner of the lower end of the opening 32q is Q, the line segment connecting PQ and the vertex of the projection 32p is formed to be larger than the diameter of the power transmission member 32a. That is, the protrusion 32p is configured to be able to pass through the power transmission member 32a in the axial direction of the guide member 32b. With such a configuration, the power transmission member 32a can be moved along the guide member 32b without the protrusion 32p hindering the movement of the power transmission member 32a.

Also, the distance between the upper end or lower end of the opening 32q and the vertex of the protrusion 32p is formed to be greater than the lateral width φ of the stopper 32d. Specifically, when an arc having a radius of φ is drawn around the corners P and Q, the projecting portion 32p is formed so as not to intersect with these arcs.

The stopper 32d, which has moved along the direction of the axis Lp of the guide member 32b, collides with the protrusion 32p and changes its moving direction toward the opening 32q. After that, the tip of the stopper 32d collides with the corner Q of the opening 32q, the intermediate portion of the stopper 32d contacts the protrusion 32p (the point of contact is T1), and the rear end of the stopper 32d contacts the guide member 32b. (the contact point is T2).

Therefore, as shown in FIG. 3C, the stopper 32d is supported at three points by the contacts Q, T1 and T2 with the axis Ls inclined with respect to the axis Lp of the guide member 32b. That is, the restraining portion 32g is configured to restrain the axis Ls of the stopper 32d while being inclined with respect to the axis Lp of the guide member 32b.

By the way, in the case where only the convex portion for locking the stopper 32d is formed in the intermediate portion of the guide member 32b, the convex portion and the stopper 32d are required to securely lock the stopper 32d to the convex portion while allowing the power transmission member 32a to pass through. It is necessary to manage the gap with the inner surface of the guide member 32b with high accuracy. On the other hand, in the present embodiment, as described above, the protrusion 32p can change the moving direction of the stopper 32d, and it is only necessary to incline the axis Ls.

Therefore, since it is sufficient that the gap between the projection 32p and the inner surface of the guide member 32b allows the power transmission member 32a to pass through, for example, a sphere having the same diameter as the diameter of the power transmission member 32a is used as the guide member. Accuracy control of the inner diameter can be easily performed simply by passing from the inlet to the outlet of 32b.

Here, the operation of the pretensioner 3 will be described with reference to FIGS. 2(A) to 2(C). As shown in FIG. 2A, the power transmission member 32a is housed within the guide member 32b before the pretensioner 3 is activated. At this time, the tip of the power transmission member 32a is inserted to a position facing the guide member 32f.

In an emergency such as a vehicle collision, the pretensioner 3 is actuated, working gas is supplied from the gas generator 32c into the guide member 32b, the power transmission member 32a is pushed out through the piston 32e and the stopper 32d, and the guide member 32b is pushed out. move along. At this time, the distal end portion of the power transmission member 32a collides with the sliding surface 32k of the guide member 32f, is deflected toward the first opening 32h, moves along the sliding surface 32k, and reaches the outer circumference of the ring gear 31. is released toward an engaging tooth formed on the .

In the pretensioner 3 using a resin rod (power transmission member 32 a ), the pressure applied to the power transmission member 32 a generally tends to be highest when meshing with the ring gear 31 is started. Therefore, by arranging the guide member 32f, which is a component with high strength, in this portion, it is possible to effectively receive the load generated at the start of meshing.

The power transmission member 32a released from the guide member 32b collides with the engaging teeth of the ring gear 31 and causes the ring gear 31 to rotate. After that, the power transmission member 32 a moves along the path formed by the pretensioner cover 33 and the guide spacer 34 while being plastically deformed by the engaging teeth of the ring gear 31 .

As shown in FIG. 2B, when the stopper 32d reaches the protrusion 32p, the stopper 32d collides with the protrusion 32p and changes its moving direction, as described above. The stopper 32d whose movement direction has been changed collides with the lower end corner of the opening 32q, and as shown in FIG.

Since the resin piston 32e is arranged behind the stopper 32d, the piston 32e is pressed against the stopped stopper 32d by the working gas, and the gap between the stopper 32d and the guide member 32b is sealed. .

Although not shown, the power transmission member 32a stops when the slack in the webbing is completely taken up. Therefore, when the amount of slack in the webbing is small, the power transmission member 32a stops before the stopper 32d reaches the restraining portion 32g. 32a may stop moving.

According to the retractor 1 according to the present embodiment described above, since the stopper 32d is restrained by inclining the axial center Ls of the stopper 32d within the guide member 32b, the stopper 32d is not released from the guide member 32b. , the release of the working gas from the gas generator 32c to the outside can be suppressed. Further, as described above, the accuracy control of the inner diameter of the guide member 32b can be easily performed.

Next, modified examples of the stopper 32d will be described with reference to FIGS. 4(A) to 4(C). Here, FIG. 4 is a sectional view showing a modification of the stopper, where (A) shows the first modification, (B) shows the second modification, and (C) shows the third modification.

The modifications shown in FIGS. 4A to 4C are configured so that the stopper 32d can be plastically deformed when it collides with the projection 32p or the edge (bottom corner) of the opening 32q. . By configuring the stopper 32d to be plastically deformable, the stopper 32d can be plastically deformed by the restraining portion 32g to facilitate restraint.

A stopper 32d shown in FIG. 4A has a through hole 32r formed in the axial direction. Instead of the through hole 32r, a hole that does not penetrate may be formed in the front end portion, the rear end portion, or the front end portion and the rear end portion in the axial direction.

A stopper 32d shown in FIG. 4B has a through hole 32s formed in the radial direction. Instead of the through holes 32s, a plurality of holes that do not penetrate in the radial direction may be formed.

A stopper 32d shown in FIG. 4C has an annular concave portion 32t formed on the outer circumference of the intermediate portion. Instead of the annular 32t, a plurality of depressions may be formed on the outer periphery.

Next, modified examples of the restraining portion 32g will be described with reference to FIGS. 5(A) to 5(E). Here, FIG. 5 is a cross-sectional view showing a modified example of the restraint part, (A) is the first modified example, (B) is the second modified example, (C) is the third modified example, and (D) is the third modified example. A fourth modified example, (E) a fifth modified example, is shown.

A restraining portion 32g shown in FIG. 5A is formed by forming the projection 32p with a rivet. Thus, the protrusion 32p is not limited to being formed by a part of the guide member 32b, and may be formed by other parts such as rivets and pins.

A restraining portion 32g shown in FIG. 5B is formed by forming a lower end portion 32u of an opening portion 32q not by the guide member 32b but by another component. For example, the lower end portion 32u can be formed by deforming a part of the base frame 11, or can be formed by a pin fixed to the base frame 11 or the like. With such a configuration, the strength of the lower end portion 32u can be improved, and the size of the opening portion 32q can be easily adjusted.

A restraining portion 32g shown in FIG. 5(C) is formed by arranging a sealing member 32v outside the guide member 32b so as to block the opening 32q. The sealing member 32v may be a separate plate member fixed to the outside of the guide member 32b, or may be formed by deforming a part of the base frame 11. As shown in FIG. With such a configuration, it is possible to mitigate the impact that occurs when the stopper 32d collides with the opening 32q. The sealing member 32v may be formed by partially deforming the guide member 32b.

The restricting portion 32g shown in FIG. 5D is obtained by shifting the positions of the protrusion 32p and the opening 32q such that the opening 32q faces the second end face 112 of the base frame 11. As shown in FIG. With this configuration, the second end face 112 of the base frame 11 can be used as the sealing member 32v.

A restraining portion 32g shown in FIG. 5E is configured such that an opening 32q is closed with a cap-like sealing member 32v. The inner surface of the sealing member 32v may be on the extension line of the inner surface of the guide member 32b, but is configured so as not to protrude inward from the inner surface of the guide member 32b. The sealing member 32v may be made of metal or resin.

As shown in the left diagram, the sealing member 32v according to the fifth modification seals the opening 32q until the stopper 32d collides normally and after the pretensioner 3 is activated. When the posture of the stopper 32d changes and collides with the sealing member 32v, the sealing member 32v falls out of the opening 32q as shown in the right figure. With this configuration, the movement of the power transmission member 32a can be guided by the inner surface of the sealing member 32v, and the impact generated when the stopper 32d collides with the opening 32q can be mitigated.

Next, a seatbelt device according to one embodiment of the present invention will be described with reference to FIG. Here, FIG. 6 is an overall configuration diagram showing a seat belt device according to one embodiment of the present invention. In addition, in FIG. 6, for convenience of explanation, components other than the seatbelt device are shown by dashed lines.

A seat belt device 100 according to the present embodiment shown in FIG. 6 includes a webbing W that restrains an occupant, a retractor 1 that winds up the webbing W, a guide anchor 101 that is provided on the vehicle body side and guides the webbing W, Equipped with a belt anchor 102 for fixing the webbing W to the vehicle body, a buckle 103 arranged on the side surface of the seat S, and a tongue 104 arranged on the webbing W, the retractor 1 has, for example, the configuration shown in FIG. have.

Components other than the retractor 1 will be briefly described below. The seat S includes, for example, a seat portion S1 on which an occupant sits, a backrest portion S2 positioned behind the occupant, and a headrest portion S3 that supports the occupant's head. The retractor 1 is built in the B-pillar R of the vehicle body, for example. Further, generally, the buckle 103 is often arranged on the side surface of the seat portion S1, and the belt anchor 102 is often arranged on the lower surface of the seat portion S1. Further, the guide anchor 101 is often arranged on the B-pillar R. The webbing W has one end connected to the belt anchor 102 and the other end connected to the retractor 1 via the guide anchor 101 .

Therefore, when fitting the tongue 104 to the buckle 103 , the webbing W is pulled out from the retractor 1 while sliding through the insertion hole of the guide anchor 101 . When the occupant wears the seat belt or releases the seat belt when getting off the vehicle, the webbing W is wound up by the action of the spring unit 4 of the retractor 1 until a certain load is applied.

The above-described seatbelt device 100 is obtained by applying the retractor 1 according to the above-described embodiment to a normal seatbelt device for front seats. Therefore, according to the seat belt device 100 according to the present embodiment, the stopper 32d is restrained by inclining the axial center Ls of the stopper 32d within the guide member 32b. Therefore, the release of the working gas from the gas generator 32c to the outside can be suppressed. In addition, it is possible to easily manage the accuracy of the inner diameter of the guide member 32b.

Note that the seat belt device 100 according to the present embodiment is not limited to application to the front seats, and can be easily applied to rear seats by omitting the guide anchors 101, for example. Moreover, the seatbelt device 100 according to the present embodiment can also be used in vehicles other than vehicles.

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the scope of the present invention.

1 retractor 2 spool 3 pretensioner 4 spring unit 5 lock mechanism 6 vehicle sensor 11 base frame 21 torsion bar 31 ring gear 32 power transmission device 32a power transmission member 32b guide member 32c gas generator 32d stopper 32e piston 32f guide member 32g restraint portion 32h First opening 32i First notch 32j First insertion hole 32k Sliding surface 32m Notch 32n Bolt 32o Bolt hole 32p Projection 32q Openings 32r, 32s Through hole 32t Recess 32u Lower end 32v Sealing member 33 Pre Tensioner covers 33a, 33b, 33c Fixing pin 34 Guide spacer 51 Retainer cover 52 Locking base 53 Lock gear 100 Seatbelt device 101 Guide anchor 102 Belt anchor 103 Buckle 104 Tongue 111 First end face 111a Opening 112 Second end faces 112a, 112b Opening Part 113 Side 114 Tie plate

Claims (9)

A pretensioner including a ring gear connected to a spool for winding webbing that restrains an occupant, and a power transmission device that transmits power to the ring gear in an emergency,
The power transmission device includes a rod-shaped power transmission member made of resin that transmits power to the ring gear, a cylindrical guide member that guides the power transmission member to the ring gear, and an operating mechanism inside the guide member. a gas generator that supplies gas, a stopper that is arranged between the gas generator and the power transmission member, and a restraining portion that is formed in the guide member and restrains the stopper,
The stopper has a shape elongated in the axial direction of the guide member,
The restraint part is configured to restrain the stopper in a state where the axis of the stopper is inclined with respect to the axis of the guide member,
The restraining portion includes a protrusion projecting inward of the guide member, and an opening forming a space that allows a change in posture that occurs when the stopper collides with the protrusion, and the stopper is , having a lateral width greater than the radial width of the power transmission member;
A pretensioner characterized by: 2. The pretensioner according to claim 1, wherein said opening is formed opposite said protrusion. 2. The pretensioner according to claim 1, wherein said protrusion is configured to be able to pass through said power transmission member in an axial direction of said guide member. 2. The pretensioner according to claim 1, wherein a distance between an upper end or a lower end of said opening and an apex of said protrusion is formed to be larger than the lateral width of said stopper. The pretensioner according to claim 1, wherein the restraining portion includes a sealing member arranged to close the opening. The pretensioner according to claim 1, wherein the stopper is configured to be plastically deformable when it collides with the protrusion or the edge of the opening. The pretensioner according to claim 1, wherein the power transmission device includes a piston arranged between the stopper and the gas generator. A retractor comprising the pretensioner according to any one of claims 1 to 7 . A seatbelt device comprising a retractor having the pretensioner according to any one of claims 1 to 7 .