JP2020044969A - Pretensioner, retractor, and seat belt device - Google Patents

Abstract

To provide a pretensioner which can retain a position of an initial state of a power transmission member when the pretensioner is not operated with a simple structure, and to provide a retractor and a seat belt device.SOLUTION: A power transmission device 32 includes: a rod-like power transmission member 32a which transmits power to a ring gear 31 while plastically deforming; a guide member 32b which guides the power transmission member 32a to the ring gear 31; a stopper ball 32c disposed behind the power transmission member 32a; a piston 32d disposed behind the stopper ball 32c; a gas generator 32e disposed at a rear end part of the guide member 32b; a guide member 32f which supports the power transmission member 32a when engagement between the power transmission member 32a and the ring gear 31 starts; and an engagement part 32g which engages with a tip edge part of the power transmission member 32a housed in the guide member 32b.SELECTED DRAWING: Figure 1

Description

  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 rod-shaped power transmission member.

  2. Description of the Related Art Generally, a vehicle such as an automobile is provided with a seat belt device that restrains an occupant on a seat including a seat portion on which the occupant sits and a backrest portion located on the back of the occupant. Such a seat belt device includes a webbing that restrains an occupant, a retractor that winds up the webbing, a buckle that is arranged on a side surface of the seat, and a tongue that is arranged on the webbing. The occupant is restrained to the seat by webbing. Also, it has become common for the retractor to have a pretensioner for removing slack of the webbing in an emergency such as a vehicle collision.

  In recent years, it has been researched and developed to use a resin-made elongated rod-shaped component as a power transmission member (load transmission element) of a pretensioner (for example, see Patent Document 1). In such a pretensioner, a resin rod is housed in an elongated tubular pipe (guide member), and in an emergency such as a vehicle collision, the resin rod is moved along the pipe to be guided to a ring gear (drive wheel). The ring gear is rotated by moving the resin rod while cutting into the teeth of the ring gear.

  Since this power transmission member is made of resin, depending on the shape of the pipe, the initial position may be shifted in the pipe due to the influence of vibration, temperature change, and the like when the pretensioner is not operated. In view of the above, in the invention described in Patent Document 2, in order to stabilize the attitude of the moving member in the direction of the central axis of the moving member (power transmission member), the moving member is formed into a cylindrical member in a no-load state where no load is applied. It is disclosed to be formed in a shape following the arrangement position in the inside.

DE 10 2006 313 359 A1 JP 2017-100683 A

  However, when the initial shape of the power transmission member is formed into a curved shape as in the invention described in Patent Document 2 described above, how to insert the power transmission member into the pipe, when inserting the power transmission member into the pipe, There are many difficulties in the manufacturing process, such as how to match the curved portion of the pipe with the curved portion of the power transmission member.

  The present invention has been made in view of such a problem, and provides a pretensioner, a retractor, and a seatbelt device that can hold a position of an initial state of a power transmission member when the pretensioner is not operated with a simple structure. The purpose is to provide.

  According to the present invention, in a pretensioner including a ring gear connected to a spool that winds up webbing that restrains an occupant, and a power transmission device that transmits power to the ring gear in an emergency, the power transmission device Is a rod-shaped power transmission member that transmits power to the ring gear while plastically deforming, a guide member that guides the power transmission member to the ring gear, and the power transmission member that is housed in the guide member. And a locking portion for locking to a leading edge of the pretensioner.

  Further, according to the present invention, in a retractor including a spool that winds up webbing for restraining an occupant and a pretensioner that winds the webbing and removes slack in an emergency, the pretensioner is attached to the spool. A ring gear connected thereto, including a power transmission device for transmitting power to the ring gear in an emergency, the power transmission device is a rod-shaped power transmission member that transmits power to the ring gear while plastically deforming, A guide member that guides the power transmission member to the ring gear, and a locking portion that locks to a leading edge of the power transmission member housed in the guide member. A retractor is provided.

  Further, according to the present invention, in a seat belt device including a webbing for restraining an occupant and a retractor for winding the webbing, the retractor includes: a ring gear connected to the spool; A power transmission device for transmitting power to a gear, wherein the power transmission device is a rod-shaped power transmission member that transmits power to the ring gear while plastically deforming, and guides the power transmission member to the ring gear. A seat belt device is provided, which comprises: a guide member that engages with the guide member; and an engaging portion that engages with a leading edge of the power transmission member housed in the guide member.

  The power transmission device may include a guide member that supports the power transmission member when the power transmission member and the ring gear start meshing, and the locking portion may be formed on the guide member. Further, the locking portion may include any one of a convex portion, a concave portion, a corner portion, and a deformable projection formed on the sliding surface of the guide member.

  The locking portion may be formed on the guide member. Further, the locking portion may include a portion in which a part of a peripheral surface of the guide member is deformed inward.

  The power transmission member has an enlarged diameter portion formed thicker than other portions at the tip, and the locking portion contacts a portion other than the enlarged diameter portion of the power transmission member when the power transmission device is operated. It may be formed so as not to be.

  According to the pretensioner, the retractor, and the seatbelt device according to the present invention described above, the locking portion that locks to the leading edge of the power transmission member housed in the guide member is disposed, so that the pretensioner can be mounted on the power transmission member. The housed state (initial state) of the power transmission member in the operating state can be held, and the position of the initial state of the power transmission member when the pretensioner is not operated can be held with a simple structure.

FIG. 2 is an exploded view showing the retractor according to the first embodiment of the present invention. It is an enlarged view which shows the guide member shown in FIG. 1, (A) is 1st embodiment, (B) is 1st modification, (C) is 2nd modification, (D) is 3rd modification, Is shown. It is explanatory drawing which shows operation | movement of a pretensioner, (A) has shown the non-operation state and (B) has shown the operation completion state. It is sectional drawing which shows the retractor which concerns on other embodiment of this invention, (A) has shown 2nd embodiment and (B) has shown the modification. 1 is an overall configuration diagram illustrating a seat belt device according to an embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a component development view showing the retractor according to the first embodiment of the present invention. 2A and 2B are enlarged views showing the guide member shown in FIG. 1, wherein FIG. 2A is a first embodiment, FIG. 2B is a first modification, FIG. 2C is a second modification, and FIG. 3 shows a modified example. 2 (A) to 2 (C), the left figure shows a front view of the guide member, and the right figure shows a longitudinal sectional view of the guide member.

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

  The power transmission device 32 includes, for example, a rod-shaped power transmission member 32a that transmits power to the ring gear 31 while plastically deforming, a guide member 32b that guides the power transmission member 32a to the ring gear 31, and a power transmission member 32a. A stopper ball 32c disposed rearward, a piston 32d disposed rearward of the stopper ball 32c, a gas generator 32e disposed at a rear end of the guide member 32b, a power transmission member 32a and a ring gear 31. It includes a guide member 32f that supports the power transmission member 32a at the start of meshing, and a locking portion 32g that locks to a distal edge of the power transmission member 32a housed in the guide member 32b.

  The spool 2 is a winding drum that winds the webbing, and is rotatably accommodated in a base frame 11 that forms a skeleton 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 surface 113 and connected to the first end face 111 and the second end face 112.

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

  An opening 111a through which the shaft of the spool 2 is inserted is formed in the first end face 111 of the base frame 11, and a pawl (not shown) of the lock mechanism 5 is formed in the second end face 112 of the base frame 11. ) Is formed with an opening 112a having internal teeth engageable with the opening 112a. 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. The lock mechanism 5 is disposed outside the second end surface 112 of the base frame 11, and the lock mechanism 5 is housed in the retainer cover 51.

  The vehicle sensor 6 that detects sudden deceleration or inclination of the vehicle body may be disposed on the retainer cover 51. The vehicle sensor 6 has, for example, a spherical mass (not shown) and a sensor lever 61 which is swung by the movement of the mass. The vehicle sensor 6 is fitted and fixed in an opening 112b formed in the second end surface 112 of the base frame 11.

  The spool 2 may have a cavity at 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 lock mechanism 5 connected to an end of the spool 2, 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 by the mainspring stored in the spring unit 4 in the direction of winding the webbing.

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

  The locking base 52 has a pawl (not shown) arranged so as to be able to protrude and retract from the side surface thereof. When the lock mechanism 5 is operated, the pawl is projected from the side surface of the locking base 52 to engage with the internal teeth formed in the opening 112a of the base frame 11, thereby restricting the rotation of the locking base 52 in the webbing pull-out direction. I do.

  Therefore, even when a load is applied in the webbing withdrawal direction in a state where the lock mechanism 5 is operated, the spool 2 can be held in the non-rotating state until a load equal to or more than the threshold is applied to the torsion bar 21. it can. When a load equal to or greater than the threshold value is applied to the torsion bar 21, the torsion bar 21 is twisted, so that the spool 2 relatively rotates and the webbing is pulled out.

  Further, the lock mechanism 5 includes a lock gear 53 arranged so as to be adjacent to the locking base 52. The lock gear 53 includes a flywheel (not shown) that is swingably disposed. When the webbing is faster than a normal pulling speed, the flywheel swings and is formed on the retainer cover 51. Engaged with the internal teeth. When the vehicle sensor 6 operates, the sensor lever 61 engages with external teeth formed on the side surface of the lock gear 53.

  Thus, the rotation of the lock gear 53 is regulated by the operation of the flywheel or the 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 projects from the side surface of the locking base 52 with this relative rotation.

  Note that the lock mechanism 5 is not limited to the configuration shown in the figure, and any of various configurations existing in the related art can be arbitrarily selected and used. Further, instead of the torsion bar 21, the spool 2 may include an impact absorbing mechanism configured by a combination of a shaft and a wire-shaped or plate-shaped plastic deformation member.

  The pretensioner 3 includes, for example, a ring gear 31 having engagement teeth on the outer periphery, a power transmission device 32, a pretensioner cover 33 that stores the ring gear 31, and a guide spacer that forms a moving space for the power transmission member 32a. 34, and a shaft guide 35 that regulates the radial movement of the ring gear 31.

  The pretensioner cover 33, the guide spacer 34, and the shaft guide 35 are disposed inside the second end surface 112 of the base frame 11, and the guide spacer 34 and the shaft guide 35 are accommodated in the pretensioner cover 33. The ring gear 31 is disposed so as to be located in a space between the pretensioner cover 33 and the second end surface 112 secured by the guide spacer 34. Note that the ring gear 31 may be referred to as a driving wheel or a rotating member.

  The power transmission device 32 is arranged, for example, in the order of a gas generator 32e, a piston 32d, a stopper ball 32c, and a power transmission member 32a made of a rod-shaped resin from the rear end to the front end of the guide member 32b having a pipe shape. ing. The power transmission member 32a, the stopper ball 32c, and the piston 32d are housed in the guide member 32b, and move in the guide member 32b by a working gas generated from a gas generator 32e disposed at the rear end of the guide member 32b. .

  Before the power transmission member 32a is inserted into the guide member 32b, the power transmission member 32a is formed in a rod shape having a linear shape, is pressed into the guide member 32b from the distal end side of the guide member 32b, and as shown in FIG. Are accommodated inside in a state along the shape of the guide member 32b. Further, the power transmission member 32a may include an enlarged-diameter portion 32aa formed at the tip thereof to be slightly thicker than other portions.

  By forming the enlarged diameter portion 32aa, the contact area of the ring gear 31 with the teeth can be increased, and the power of the power transmission member 32a can be efficiently transmitted to the ring gear 31. In the present embodiment, a portion (other portion) of the power transmission member 32a other than the enlarged diameter portion 32aa is referred to as a main body portion 32ab.

  For example, as shown in FIG. 1, the guide member 32 b passes through the upper part of the first end face 111, the upper part of the tie plate 114, the upper part of the second end face 112, and the corner formed by the second end face 112 and the side face 113. It has a curved shape so as to extend downward from the upper part inside the part.

  A guide member 32f is arranged at the tip of the guide member 32b. An opening 32h for discharging the power transmission member 32a guided by the guide member 32f from the guide member 32b to the space formed by the pretensioner cover 33 and the guide spacer 34 is formed at the distal end of the guide member 32b. I have.

  A reduced diameter portion 32i in which the cross-sectional area of the guide member 32b is partially reduced may be formed at the front end portion of the guide member 32b and in front of (at the rear end of) the opening 32h. The reduced diameter portion 32i is formed, for example, by drawing all or part of the outer periphery of the guide member 32b. Although not shown, the reduced diameter portion 32i may be formed using metal fittings such as bolts and rivets.

  When the pretensioner 3 is activated, the stopper ball 32c collides with the reduced diameter portion 32i and stops, and the piston 32d seals a gap between the stopper ball 32c and the guide member 32b, thereby suppressing the external discharge of the working gas. doing.

  The guide member 32f has, for example, a substantially cylindrical shape that can be inserted into the distal end portion of the guide member 32b as shown in FIG. 2 (A), and has a power transmission member 32a at the end on the insertion side and an opening 32h. The sliding surface 32j that guides the skew is formed obliquely. The sliding surface 32j has a groove shape curved along the outer shape of the power transmission member 32a.

  Further, a cutout portion 32k through which a pin 33a (see FIG. 1) for fixing the pretensioner cover 33 to the base frame 11 (second end surface 112) is formed below the sliding surface 32j. Further, a bolt hole 32n for screwing a bolt 32m (see FIG. 1) for fixing the guide member 32f and the guide member 32b to the base frame 11 (side surface 113) is formed on the back side of the sliding surface 32j.

  As shown, a locking portion 32g is formed above the sliding surface 32j. The locking portion 32g is, for example, a convex portion formed by a bow-shaped flat plate. As described above, by forming the locking portion 32g on the guide member 32f, only by fixing the guide member 32f to the guide member 32b, the locking portion 32g is formed on the distal end edge (the enlarged diameter portion 32aa) of the power transmission member 32a. Can be abutted. Therefore, the locking portion 32g can function as a stopper when the power transmission member 32a is not operated.

  That is, by disposing the locking portion 32g, it is possible to hold the position of the power transmission member 32a in the housed state (initial state) when the pretensioner 3 is not operated.

  Here, as shown in the right diagram of FIG. 2A, if the height of the locking portion 32g (convex portion) from the sliding surface 32j is β, the height β is the height of the power transmission member 32a. The numerical value is set to a value smaller than the diameter expansion amount α of the expanded diameter portion 32aa (the difference between the radius of the expanded diameter portion 32aa and the radius of the main body 32ab). By setting the height β of the locking portion 32g in this manner, the locking portion 32g does not come into contact with a portion other than the enlarged diameter portion 32aa (the main body portion 32ab) of the power transmission member 32a when the power transmission device 32 operates. You can do so.

  Further, the locking portion 32g may be a concave portion formed on the sliding surface 32j as shown in FIG. 2 (B). Here, assuming that the depth of the locking portion 32g (recess) from the sliding surface 32j is γ, the depth γ is the amount of expansion α of the enlarged diameter portion 32aa of the power transmission member 32a (the enlarged diameter α of the enlarged diameter portion 32aa). (The difference between the radius and the radius of the main body 32ab). By setting the depth γ of the locking portion 32g in this way, the resistance of the power transmission member 32a at the time of starting can be reduced.

  Further, the locking portion 32g may be a corner formed on the sliding surface 32j as shown in FIG. 2 (C). Here, assuming that the amount of wrap between the locking portion 32g (corner portion) and the power transmission member 32a is ε, the amount of wrap ε is equal to the amount of expansion α (the diameter of the expanded portion 32aa (The difference between the radius of the main part 32ab and the radius of the main part 32ab). By setting the wrap amount ε of the locking portion 32g in this way, the resistance of the power transmission member 32a at the time of starting can be reduced, and the locking portion 32g can be moved by the power transmission member 32a when the power transmission device 32 operates. Can be prevented from contacting any portion other than the enlarged diameter portion 32aa (the main body portion 32ab).

  Further, the locking portion 32g may be a deformable protrusion formed on the upper surface of the sliding surface 32j as shown in FIG. 2D. This projection may be made of resin or metal. Further, it may be formed integrally with the guide member 32f, or may be constituted by a separate part. The locking portion 32g (projection) is tilted or broken by the start of the power transmission member 32a. A recess 32p for accommodating the inclined or broken locking portion 32g (projection) may be formed below the locking portion 32g of the sliding surface 32j. By forming the concave portion 32p in this manner, the inclined or broken locking portion 32g is prevented from contacting a portion (the main body portion 32ab) other than the enlarged diameter portion 32aa of the power transmission member 32a when the power transmission device 32 operates. can do.

  Next, the operation of the pretensioner 3 according to the above-described first embodiment will be described with reference to FIGS. 3 (A) and 3 (B). Here, FIG. 3 is an explanatory diagram showing the operation of the pretensioner, in which (A) shows a non-operating state and (B) shows an operation completed state.

  As shown in FIG. 3A, in an initial state where the pretensioner 3 is not operated, the power transmission member 32a is housed in the guide member 32b. At this time, the power transmission member 32a is arranged such that the leading edge (the enlarged diameter portion 32aa) abuts on the locking portion 32g formed on the guide member 32f. In the present embodiment, the “tip edge” means an edge of the tip surface 32ac.

  A passage 36 is formed in the pretensioner cover 33 as a space through which the power transmission member 32a can pass when the pretensioner 3 operates. The passage 36 is formed by the ring gear 31, the pretensioner cover 33, the guide spacer 34, the guide member 32f, and the like. A stopper 37 may be arranged at the end of the passage 36.

  Further, the cross-sectional area of the passage 36 may be formed so as to gradually increase from the entrance of the passage 36 (that is, the engagement start portion between the power transmission member 32a and the ring gear 31) toward the end of the passage 36. . Since the guide member 32f is a component that supports the power transmission member 32a when the ring gear 31 starts meshing, the guide member 32f is arranged to form the narrowest portion of the passage 36 of the power transmission member 32a. .

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

  In an emergency such as a vehicle collision, the pretensioner 3 operates, the working gas is supplied from the gas generator 32e into the guide member 32b, and the power transmission member 32a is pushed out through the piston 32d and the stopper ball 32c, and the guide member 32b Move along. At this time, the enlarged diameter portion 32aa of the power transmission member 32a moves over the locking portion 32g and moves along the sliding surface 32j of the guide member 32f.

  Here, when the height β (see FIG. 2A) of the locking portion 32g (convex portion) is set to a value smaller than the diameter expansion amount α, the power transmission member 32a of the diameter expansion portion 32aa When the enlarged diameter portion 32aa of the second member 32 gets over the locking portion 32g and lands on the sliding surface 32j of the guide member 32f, the locking portion 32g (convex portion) is prevented from contacting the main body portion 32ab of the power transmission member 32a. be able to.

  Then, the power transmission member 32a that has moved along the sliding surface 32j of the guide member 32f collides with the engagement teeth of the ring gear 31, and rotates the ring gear 31. Thereafter, the power transmission member 32 a moves along the passage 36 while being plastically deformed by the engagement teeth of the ring gear 31.

  Finally, as shown in FIG. 3B, the power transmission member 32a stops when the slack of the webbing is completely wound. In some cases, the power transmission member 32a collides with the stopper 37 disposed at the end of the passage 36 and stops.

  While the power transmission member 32a is rotating the ring gear 31, the power transmission member 32a is pushed straight out of the guide member 32b, and then is bent and moved along the sliding surface 32j of the guide member 32f. Becomes Therefore, as shown in FIG. 3 (B), a dead space 32q (portion surrounded by a dotted line in the figure) that does not come into contact with the power transmission member 32a during operation of the pretensioner 3 is formed above the guide member 32f. You. The locking portion 32g may be formed in the dead space 32q. With this configuration, interference between the locking portion 32g and the main body portion 32ab during the movement of the power transmission member 32a can be suppressed.

  Next, a retractor 1 according to another embodiment of the present invention will be described with reference to FIGS. 4 (A) and 4 (B). Here, FIG. 4 is a cross-sectional view showing a retractor according to another embodiment of the present invention, wherein (A) shows a second embodiment and (B) shows a modification. 4A and 4B are longitudinal sectional views of a portion including the ring gear 31. FIG.

  The retractor 1 shown in FIGS. 4A and 4B has a locking portion 32g formed on a guide member 32b. Specifically, the locking portion 32g is configured by a portion in which a part of the peripheral surface of the guide member 32b is deformed inward.

  In the second embodiment shown in FIG. 4A, for example, an inverted U-shaped cut is made in the peripheral surface of a portion corresponding to the initial position of the power transmission member 32a, and a tab formed by the cut is guided. The locking portion 32g is formed by being deformed inside the member 32b.

  In a modification of the second embodiment shown in FIG. 4B, the peripheral surface of a portion corresponding to the initial position of the power transmission member 32a is pressed from the outside, and the guide member 32b is formed into a point shape or a short line shape inside. The recessed portion forms the locking portion 32g.

  The guide member 32f is formed in a shape that does not interfere with the locking portion 32g formed on the guide member 32b. Here, the case where the pretensioner 3 has the guide member 32f is described. However, when the locking portion 32g is formed on the guide member 32b, even if the pretensioner 3 does not have the guide member 32f, the locking is performed. A portion 32g can be formed.

  Next, a seat belt device according to an embodiment of the present invention will be described with reference to FIG. Here, FIG. 5 is an overall configuration diagram showing the seat belt device according to the embodiment of the present invention. In FIG. 5, for convenience of description, components other than the seat belt device are shown by dashed lines.

  The seat belt device 100 according to the present embodiment illustrated in FIG. 5 includes a webbing W that restrains an occupant, a retractor 1 that winds up the webbing W, and a guide anchor 101 that is provided on the vehicle body side and guides the webbing W. The retractor 1 includes a belt anchor 102 for fixing the webbing W to the vehicle body side, a buckle 103 disposed on a side surface of the seat S, and a tongue 104 disposed on the webbing W. The retractor 1 has, for example, the configuration shown in FIG. have.

  Hereinafter, components other than the retractor 1 will be briefly described. The seat S includes, for example, a seat portion S1 on which an occupant sits, a backrest portion S2 located on the back of the occupant, and a headrest portion S3 for supporting the occupant's head. The retractor 1 is built in, for example, a B pillar P of a vehicle body. In general, the buckle 103 is often arranged on the side surface of the seat S1, and the belt anchor 102 is often arranged on the lower surface of the seat S1. Further, the guide anchor 101 is often arranged on the B pillar P. 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 the tongue 104 is fitted on the buckle 103, the webbing W is pulled out from the retractor 1 while sliding in the insertion hole of the guide anchor 101. Further, when the occupant wears the seat belt or releases the seat belt at the time of getting off, the webbing W is wound up until a certain load is applied by the action of the spring unit 4 of the retractor 1.

  The above-described seat belt device 100 is obtained by applying the retractor 1 according to the above-described embodiment to a normal seat belt device in a front seat. Therefore, according to the seatbelt device 100 according to the present embodiment, the position of the accommodated state (initial state) of the power transmission member 32a when the pretensioner 3 is not operated can be held by the locking portion 32g.

  The seatbelt device 100 according to the present embodiment is not limited to the application to the front seat, and can be easily applied to the rear seat without the guide anchor 101, for example. Further, the seatbelt device 100 according to the present embodiment can be used for vehicles other than vehicles.

  The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

Reference Signs List 1 retractor 2 spool 3 pretensioner 4 spring unit 5 locking mechanism 6 vehicle sensor 11 base frame 21 torsion bar 31 ring gear 32 power transmission device 32a power transmission member 32aa enlarged diameter portion 32ab main body portion 32ac tip surface 32b guide member 32c stopper ball 32d Piston 32e Gas generator 32f Guide member 32g Locking portion 32h Opening 32i Reduced diameter portion 32j Sliding surface 32k Notch 32m Bolt 32n Bolt hole 32p Recess 32q Dead space 33 Pretensioner cover 33a Pin 34 Guide spacer 35 Shaft guide 36 Passage 37 Stopper 51 Retainer cover 52 Locking base 53 Lock gear 61 Sensor lever 100 Seat belt device 101 Guide anchor 102 Belt anchor 103 Back Le 104 tongue 111 first end face 111a opening 112 second end face 112a, 112b opening 113 side 114 tie

Claims (8)

In a pretensioner including a ring gear connected to a spool that winds up webbing that restrains an occupant, and a power transmission device that transmits power to the ring gear in an emergency,
The power transmission device is a rod-shaped power transmission member that transmits power to the ring gear while being plastically deformed, a guide member that guides the power transmission member to the ring gear, and a state in which the power transmission member is housed in the guide member. A locking portion that locks to a distal edge portion of the power transmission member.
A pretensioner characterized in that:   2. The power transmission device according to claim 1, wherein the power transmission device includes a guide member that supports the power transmission member when the engagement between the power transmission member and the ring gear starts, and the locking portion is formed on the guide member. 3. The described pretensioner.   The pretensioner according to claim 2, wherein the locking portion includes any one of a convex portion, a concave portion, a corner portion, and a deformable protrusion formed on a sliding surface of the guide member.   The pretensioner according to claim 1, wherein the locking portion is formed on the guide member.   The pretensioner according to claim 4, wherein the locking portion includes a portion in which a part of a peripheral surface of the guide member is deformed inward.   The power transmission member has an enlarged diameter portion formed thicker than other portions at the tip, and the locking portion contacts a portion other than the enlarged diameter portion of the power transmission member when the power transmission device is operated. The pretensioner according to claim 1, wherein the pretensioner is formed so as not to do so. In a retractor including a spool that winds up webbing that restrains an occupant, and a pretensioner that winds up the webbing to remove slack in an emergency,
A retractor, wherein the pretensioner is the pretensioner according to any one of claims 1 to 6. In a seat belt device including a webbing that restrains an occupant and a retractor that winds up the webbing,
A seat belt device comprising the pretensioner according to any one of claims 1 to 6, wherein the retractor includes the pretensioner according to any one of claims 1 to 6.