WO2021153022A1 - Prétendeur, rétracteur et dispositif de ceinture de sécurité - Google Patents

Prétendeur, rétracteur et dispositif de ceinture de sécurité Download PDF

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Publication number
WO2021153022A1
WO2021153022A1 PCT/JP2020/045893 JP2020045893W WO2021153022A1 WO 2021153022 A1 WO2021153022 A1 WO 2021153022A1 JP 2020045893 W JP2020045893 W JP 2020045893W WO 2021153022 A1 WO2021153022 A1 WO 2021153022A1
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WO
WIPO (PCT)
Prior art keywords
elastic body
power transmission
piston
pretensioner
guide member
Prior art date
Application number
PCT/JP2020/045893
Other languages
English (en)
Japanese (ja)
Inventor
康二 田中
忠之 浅子
清史 渡邉
Original Assignee
Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ株式会社 filed Critical Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ株式会社
Priority to JP2021574501A priority Critical patent/JP7265042B2/ja
Publication of WO2021153022A1 publication Critical patent/WO2021153022A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/46—Reels with means to tension the belt in an emergency by forced winding up

Definitions

  • 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 in which a power transmission member is moved by a gas generator.
  • Vehicles such as automobiles are generally provided with a seatbelt device that restrains the occupant on a seat having a seating portion on which the occupant sits and a backrest portion located on the back of the occupant.
  • a seatbelt device includes a webbing for restraining an occupant, a retractor for winding the webbing, a buckle arranged on the side surface of the seat, and a tongs arranged on the webbing, and the tongs are fitted to the buckle.
  • the occupants are restrained in the seat by webbing.
  • the retractor it is becoming common for the retractor to have a pretensioner that removes slack in the webbing in an emergency such as a vehicle collision.
  • Such a patenter is powered by a power transmission member that rotates a spool that winds up a webbing, an elongated tubular pipe (guide member) that guides the power transmission member, and a working gas supplied into the pipe. It is often provided with a power transmission device including a gas generator that applies propulsive force to the transmission member (see, for example, Patent Document 1).
  • Patent Document 1 proposes various means for closing the final section of the pipe with a power transmission member (mass body or drive cylinder) so that the working gas is not discharged to the outside of the pipe.
  • Patent Document 2 has a configuration in which a piston provided with a deceleration element and a sealing element comes into contact with a stopper formed inside the pipe, and the stopper is plastically deformed by the deceleration element to stop the piston in the pipe. It is disclosed.
  • Patent Document 1 and Patent Document 2 are both configured to completely seal the pipe with a moving body (mass body, piston, etc.) that moves along the pipe. Since the pretensioner needs to wind up the webbing instantaneously (for example, within 1 second), the kinetic energy of the moving body tends to be inevitably large.
  • a moving body mass body, piston, etc.
  • the present invention has been devised in view of such problems, and provides a pretensioner, a retractor, and a seatbelt device capable of alleviating restrictions on the design of a pretensioner while suppressing the release of working gas.
  • the purpose is to be appreciated that the present invention has been devised in view of such problems, and provides a pretensioner, a retractor, and a seatbelt device capable of alleviating restrictions on the design of a pretensioner while suppressing the release of working gas. The purpose.
  • a pretensioner including a ring gear connected to a spool for winding a 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 power transmission member that transmits power to the ring gear, a tubular guide member that guides the power transmission member to the ring gear, a gas generator that supplies working gas inside the guide member, and the like.
  • a piston arranged between the gas generator and the power transmission member, an elastic body arranged in front of the piston, a seal member arranged on the rear side of the piston, and the guide member formed on the guide member.
  • the piston includes a restraint portion for restraining the piston, the piston is provided with a through hole formed in the front-rear direction, and the elastic body is configured to be able to seal the through hole and pass through the restraint portion.
  • a pretensioner characterized by that is provided.
  • the elastic body may have an outer diameter smaller than the inner diameter of the guide member and may be configured to be in contact with the inner surface of the guide member during compression.
  • the guide member may include an exhaust port formed on the tip side of the restraint portion.
  • the elastic body may have a substantially cylindrical shape, a substantially spherical shape, or an annular shape arranged on the outer circumference of the shaft member.
  • the elastic body may be provided with a recess or an annular groove formed at the rear end.
  • a plurality of the elastic bodies may be arranged in the axial direction of the guide member.
  • the pretensioner may be arranged between the elastic body and the power transmission member, and may include a resin protective member that protects the elastic body.
  • the protective member may be configured to be connectable to the elastic body.
  • the protective member may have a diameter smaller than the inner diameter of the guide member and larger than the inner diameter of the restraint portion.
  • the restraint portion may be a throttle portion formed on a part of the guide member.
  • the piston may be made of metal and have an outer diameter larger than the inner diameter of the restraint portion.
  • the power transmission member may be made of resin and have a rod shape.
  • the rear end of the power transmission member may have a spherical shape.
  • a retractor characterized by having a pretensioner having the above-described configuration.
  • a seatbelt device characterized by having a retractor provided with a pretensioner having the above-described configuration.
  • the piston is elastic until it collides with the restraint portion.
  • the through hole can be sealed by the body. Further, after the elastic body has passed through the restraint portion, the working gas can be discharged from the through hole, and the kinetic energy of the piston can be reduced. Therefore, the constraints on the design of the pretensioner can be relaxed while minimizing the emission of working gas.
  • FIG. 1 It is a component development drawing which shows the retractor which concerns on one Embodiment of this invention. It is a conceptual diagram explaining the operation of an elastic body and a piston shown in FIG. 1, (A) is a state before the gas generator is activated, (B) is a state after the gas generator is activated, (C). Is a state in which the elastic body has reached the restraint portion, (D) is a state in which the piston has reached the restraint portion, and (E) is a state in which the elastic body has passed through the restraint portion. It is sectional drawing which shows the operation of the pretensioner shown in FIG. It shows the state after the operation. It is sectional drawing which shows the deformation example of the pretensioner shown in FIG.
  • FIG. 1 is a component development view showing a retractor according to an embodiment of the present invention.
  • 2A and 2B are conceptual diagrams for explaining the actions of the elastic body and the piston shown in FIG. 1.
  • FIG. 2A is a state before the gas generator is activated
  • FIG. 2B is a state after the gas generator is activated.
  • (C) shows a state in which the elastic body reaches the restraint portion
  • (D) shows a state in which the piston reaches the restraint portion
  • (E) shows a state after the elastic body has passed through the restraint portion.
  • the retractor 1 includes a spool 2 that winds up a webbing that restrains an occupant, a pretensioner 3 that winds up the webbing to remove slack in an emergency, and the like.
  • 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.
  • the webbing diagram 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 tubular 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 piston 32c, a piston 32d arranged between the gas generator 32c and the power transmission member 32a, an elastic body 32e arranged in front of the piston 32d, and a piston 32d.
  • the seal member 32f arranged on the rear side, the restraint portion 32g formed on the guide member 32b and restraining the piston 32d, and the guide member 32h that supports the power transmission member 32a at the start of meshing between the power transmission member 32a and the ring gear 31. And have.
  • the spool 2 is a winding cylinder for winding the webbing, and is rotatably housed in the base frame 11 forming the 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 that faces the side surface 113 and is connected to the first end surface 111 and the second end surface 112.
  • 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, the pretensioner 3, the lock mechanism 5, and the like is not limited to the illustrated configuration.
  • the first end surface 111 of the base frame 11 is formed with an opening 111a through which the shaft portion of the spool 2 is inserted, and the second end surface 112 of the base frame 11 is formed with a pawl of the lock mechanism 5 (not shown). ) Is formed with an opening 112a having internal teeth that can be engaged with.
  • 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.
  • a lock mechanism 5 is arranged outside the second end surface 112 of the base frame 11, and the lock mechanism 5 is housed in the retainer cover 51.
  • the retainer cover 51 may be provided with a vehicle sensor 6 that detects sudden deceleration or tilt of the vehicle body.
  • the vehicle sensor 6 has, for example, a spherical mass body (not shown) and a sensor lever 61 that is swung by the movement of the mass body.
  • the vehicle sensor 6 may be fitted and fixed in the opening 112b formed in the second end surface 112 of the base frame 11.
  • the spool 2 has a cavity in the center, and a torsion bar 21 forming an axial center may be inserted through the spool 2.
  • the torsion bar 21 is connected to the locking base 52 of the locking mechanism 5 whose first end is connected to the end of the spool 2, the second end is fixed to the spool 2, and the spring core of the spring unit 4 is fixed. 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 direction of winding the webbing by the spring stored in the spring unit 4.
  • the means for applying the winding force to the spool 2 is not limited to the spring unit 4, and may be another means using an electric motor or the like.
  • the locking base 52 is provided with a powl (not shown) arranged so as to appear and disappear from its side surface.
  • a powl (not shown) arranged so as to appear and disappear from its side surface.
  • the spool 2 can be held in the non-rotating state until a load equal to or higher than the threshold value is applied to the torsion bar 21. can.
  • a load equal to or higher than the threshold value is generated on the torsion bar 21, the torsion bar 21 is twisted, so that the spool 2 relatively rotates and the webbing is pulled out.
  • 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 arranged, and when the webbing is faster than the normal pull-out speed, the flywheel swings and is formed on the retainer cover 51. Engage with the internal teeth.
  • the sensor lever 61 engages with the external teeth formed on the side surface of the lock gear 53.
  • the rotation of the lock gear 53 is regulated by the operation of the flywheel or the vehicle sensor 6. Then, when the rotation of the lock gear 53 is restricted, a relative rotation occurs between the locking base 52 and the lock gear 53, and the powl protrudes from the side surface portion of the locking base 52 with the relative rotation.
  • the lock mechanism 5 is not limited to the illustrated configuration, and various conventionally existing configurations can be arbitrarily selected and used. Further, the spool 2 may include a shock absorbing mechanism formed by a combination of a shaft and a wire-shaped or plate-shaped plastic deformation member instead of the torsion bar 21.
  • the pretensioner 3 includes, for example, a ring gear 31 having engaging teeth on the outer circumference, a power transmission device 32, a pretensioner cover 33 for storing the ring gear 31, and a pin 34 for restricting the movement of the power transmission member 32a. , Is equipped. Further, although not shown, the pretensioner 3 may include a guide spacer that forms a moving space for the power transmission member 32a in the pretensioner cover 33.
  • the ring gear 31 is arranged so as to be located in the space formed between the pretensioner cover 33 and the base frame 11 (second end surface 112).
  • the ring gear 31 may also be referred to as a drive wheel or a rotating member.
  • the pretensioner cover 33 is arranged inside, for example, the second end surface 112 of the base frame 11. Further, the pretensioner cover 33 is fixed to the base frame 11 (second end surface 112) together with the guide member 32b or directly by, for example, a plurality of fasteners 35a to 35c.
  • the power transmission device 32 is, for example, in the order of the gas generator 32c, the seal member 32f, the piston 32d, the elastic body 32e, and the power transmission member 32a from the rear end to the tip of the guide member 32b formed of the tubular pipe. Have been placed.
  • the power transmission member 32a, the seal member 32f, the piston 32d, and the elastic body 32e are housed in the guide member 32b, and the guide member 32b is generated by the working gas generated from the gas generator 32c arranged at the rear end of the guide member 32b. Move inside.
  • the power transmission member 32a is formed in a linear rod shape before being inserted into the guide member 32b.
  • FIG. 1 shows. As shown, it is housed inside the guide member 32b in a state of following the shape of the guide member 32b.
  • the guide member 32b passes through the upper part of the first end surface 111, the upper part of the tie plate 114, and the upper part of the second end surface 112, and is a corner formed by the second end surface 112 and the side surface 113. It has a curved shape that extends downward from the upper part inside the part.
  • a guide member 32h is arranged at the tip of the guide member 32b. Further, at the tip of the guide member 32b, an opening 32i is formed to discharge the power transmission member 32a guided by the guide member 32h from the guide member 32b into the space formed by the pretensioner cover 33. Further, the guide member 32b includes a notch 32j that communicates from the tip of the guide member 32b to the opening 32i, and an insertion hole 32k through which the fastener 35a formed below the opening 32i is inserted.
  • the opening 32i is formed at a position adjacent to the guide member 32h of the guide member 32b, and constitutes an outlet portion of the power transmission member 32a. Further, the notch portion 32j has a function of positioning the guide member 32h in the circumferential direction, and a protrusion of the guide member 32h is inserted into the notch portion 32j.
  • the guide member 32h has, for example, a substantially cylindrical shape that can be inserted into the tip of the guide member 32b, and a sliding surface 32m that guides the power transmission member 32a to the opening 32i is obliquely formed at the end on the insertion side. Has been done.
  • the sliding surface 32m may have a groove shape curved along the outer shape of the power transmission member 32a.
  • a notch 32n through which the fastener 35a is inserted is formed in the lower part of the sliding surface 32m. Further, on the back side of the sliding surface 32m, a bolt hole 32o (see FIG. 3) for screwing a bolt (not shown) for fixing the guide member 32h and the guide member 32b to the base frame 11 (side surface 113) is formed. Has been done.
  • the restraint portion 32g is a portion through which the power transmission member 32a is passed and the piston 32d is stopped in the guide member 32b.
  • the restraint portion 32g is, for example, a drawing portion formed in a part of the guide member 32b, and forms a protruding convex portion inside the guide member 32b.
  • the restraint portion 32g is formed by, for example, pressing a part of the outer circumference of the guide member 32b.
  • the piston 32d has a head 32p having a substantially hemispherical shape and a substantially cylindrical body formed behind (planar side) the head 32p. It is a metal part composed of 32q.
  • the head 32p has an outer diameter larger than the inner diameter Dr of the restraint portion 32g.
  • the head 32p is provided with a through hole 32r formed in the front-rear direction. The through hole 32r is formed so as to communicate with the space formed by the body portion 32q.
  • a seal member 32f is arranged on the outer circumference of the body portion 32q.
  • the seal member 32f is, for example, a substantially cylindrical elastomer component.
  • the outer diameter of the seal member 32f is formed to be slightly larger than the inner diameter Dp of the guide member 32b, and is press-fitted into the guide member 32b. Therefore, the seal member 32f moves while maintaining a state of being in contact with the inner surface of the guide member 32b due to the pressure of the working gas supplied from the gas generator 32c.
  • the elastic body 32e is, for example, an elastomer part formed in a substantially cylindrical shape.
  • the elastic body 32e has an outer diameter De smaller than the inner diameter Dp of the guide member 32b in a no-load state, and is configured to be in contact with the inner surface of the guide member 32b during compression. Further, the elastic body 32e has an elastic force that can be deformed into a shape that can pass through the restraint portion 32g at the time of compression.
  • the elastic body 32e may have recesses formed at the front end and the rear end. By forming a recess at the rear end of the elastic body 32e, the piston 32d can be brought into close contact with the head 32p. Further, by forming a similar recess at the front end, the elastic body 32e can be inserted into the guide member 32b without considering the front and back.
  • the elastic body 32e is inserted between the power transmission member 32a and the piston 32d in a no-load state in the state before the operation of the gas generator 32c.
  • the piston 32d moves forward while contacting the rear end of the elastic body 32e as shown in FIG. 2 (B).
  • the front end of the elastic body 32e comes into contact with the rear end of the power transmission member 32a.
  • the seal member 32f is pressed against the head portion 32p of the piston 32d by the pressure of the working gas and is deformed to seal the gap between the guide member 32b and the piston 32d.
  • the elastic body 32e is sandwiched between the power transmission member 32a and the piston 32d, compressed, and deformed so as to come into contact with the inner surface of the guide member 32b, and the power transmission member 32a moves forward together with the piston 32d. Let me. At this time, the through hole 32r of the piston 32d is sealed by the elastic body 32e.
  • the through hole 32r of the piston 32d shifts to a state where it is not sealed by the elastic body 32e, and the working gas passes through the through hole 32r and is more than the piston 32d. It flows into the space in front. Further, since the elastic body 32e is restored to have a gap between the elastic body 32e and the inner surface of the guide member 32b, the working gas can be discharged to the outside from the gap between the elastic body 32e and the guide member 32b.
  • the flow rate of the working gas discharged from the guide member 32b is controlled by the size of the through hole 32r and the size of the outer diameter of the elastic body 32e so that noise and smoke are not generated by the discharge of the working gas. It is restricted.
  • the through hole 32r can be sealed by the elastic body 32e until the piston 32d collides with the restraint portion 32g. Further, after the elastic body 32e has passed through the restraint portion 32g, the working gas can be discharged from the through hole 32r, and the kinetic energy of the piston 32d can be reduced. Therefore, the constraints on the design of the pretensioner 3 can be relaxed while minimizing the emission of the working gas.
  • 3A and 3B are cross-sectional views showing the operation of the pretensioner shown in FIG. 1, in which FIG. 3A is a state before operation, FIG. 3B is a state in which an elastic body reaches a restraint portion, and FIG. It shows the state after passing through the restraint part.
  • the power transmission member 32a is housed in the guide member 32b in the state before the operation of the pretensioner 3. At this time, the tip of the power transmission member 32a is inserted to a position facing the guide member 32h.
  • the pretensioner 3 In an emergency such as a vehicle collision, the pretensioner 3 operates, the working gas is supplied from the gas generator 32c into the guide member 32b, the power transmission member 32a is pushed out via the piston 32d and the elastic body 32e, and the guide member 32b Move along. At this time, the tip of the power transmission member 32a collides with the sliding surface 32m of the guide member 32h, is deflected toward the opening 32i, moves along the sliding surface 32m, and is formed on the outer circumference of the ring gear 31. It is released toward the engaged teeth.
  • the pressure applied to the power transmission member 32a generally tends to be the highest at the start of meshing with the ring gear 31. Therefore, by arranging the guide member 32h, which is a high-strength component, in this portion, the load generated at the start of meshing can be effectively received.
  • the power transmission member 32a released from the guide member 32b collides with the engaging teeth of the ring gear 31 and rotates the ring gear 31. After that, the power transmission member 32a moves along the passage formed by the pretensioner cover 33 while being plastically deformed by the engaging teeth of the ring gear 31.
  • the kinetic energy of the piston 32d can be reduced because the working gas is discharged to the outside from the through hole 32r of the piston 32d without confining the working gas in the guide member 32b when the piston 32d is restrained. ..
  • the power transmission member 32a stops when the slack of the webbing is completely wound up. Therefore, when the amount of slack of the webbing is small, the power transmission member 32a is before the piston 32d reaches the restraint portion 32g. The movement of 32a may stop.
  • FIG. 4 is a cross-sectional view showing a modified example of the pretensioner shown in FIG. 1, (A) is a first modified example of a piston, (B) is a second modified example of a piston, and (C) is a modified example of the piston.
  • the first deformation example of the elastic body, (D) shows the second deformation example of the elastic body.
  • the first modification of the piston 32d shown in FIG. 4A is a recessed tip of the head 32p.
  • the tip shape of the head 32p may be formed according to the shape of the elastic body 32e. For example, when the rear end of the elastic body 32e is flat, the tip of the head 32p may be formed flat, and when the rear end of the elastic body 32e is spherical, the tip of the head 32p may be spherical. It may be dented.
  • the second modification of the piston 32d shown in FIG. 4B shows a cavity 32s formed inside the head 32p.
  • the cavity 32s may communicate with the through hole 32r as shown. Further, although not shown, the cavity 32s may be formed so as to surround the outer circumference of the through hole 32r. By forming the cavity 32s in this way, the weight of the piston 32d can be reduced and the kinetic energy can be reduced.
  • the first modification of the elastic body 32e shown in FIG. 4C is a spherical shape of the elastic body 32e.
  • the elastic body 32e does not have to have a perfect spherical shape, and may have an elliptical shape or a cylindrical shape in which hemispheres are arranged at both ends. Further, although not shown, a cavity may be formed inside the elastic body 32e.
  • the annular elastic body 32e is arranged on the outer circumference of the resin shaft member 32t.
  • the shaft member 32t has an outer diameter smaller than the inner diameter Dr of the restraint portion 32g.
  • the elastic body 32e can seal the through hole 32r of the piston 32d and the restraining portion 32g by forming a part of the elastic body 32e with the elastomer material even if the elastic body 32e is not entirely formed of the elastic material. May be configured to be passable.
  • FIG. 5 is a cross-sectional view showing another modification of the pretensioner shown in FIG. 1, in which (A) is a state before operation and (B) is a state after an elastic body has passed through a restraint portion. , Is shown.
  • the same components as those in the above-described embodiment are designated by the same reference numerals, and duplicate description will be omitted.
  • an exhaust port 32u that discharges working gas is formed on the tip side of the restraining portion 32g of the guide member 32b.
  • the exhaust port 32u may have, for example, a slit shape that is elongated from a position beyond the restraint portion 32g to the tip of the guide member 32b.
  • the exhaust port 32u may be an opening formed in an elongated hole shape or a rectangular shape formed at a position exceeding the restraint portion 32g.
  • the exhaust port 32u may be a plurality of circular openings formed from a position exceeding the restraint portion 32g toward the tip end.
  • the outer diameter De of the elastic body 32e is formed to have a size equal to or larger than the inner diameter Dp of the guide member 32b. You may. At this time, the elastic body 32e is press-fitted into the guide member 32b. The elastic body 32e has an elastic force sufficient to pass through the restraint portion 32g.
  • FIG. 6 is a cross-sectional view showing another embodiment of the pretensioner shown in FIG. 1, (A) is a second embodiment, (B) is a third embodiment, and (C) is a fourth embodiment.
  • the embodiment is shown.
  • 7A and 7B are cross-sectional views showing another embodiment of the pretensioner shown in FIG. 1, in which FIG. 7A is a fifth embodiment, FIG. 7B is a sixth embodiment, and FIG. 7C is a seventh embodiment. Is shown.
  • the same components as those in the above-described embodiment are designated by the same reference numerals, and duplicate description will be omitted.
  • the rear end 321 (end portion on the elastic body 32e side) of the power transmission member 32a is formed in a spherical shape.
  • the elastic body 32e is pressed against the rear end 321 of the power transmission member 32a by the working gas. Therefore, when the power transmission member 32a has a corner at the rear end 321, stress concentration may occur in the elastic body 32e.
  • the "spherical shape" does not have to be a spherical shape of a true sphere, and means a smooth shape without corners.
  • a spacer 322 that fills the gap may be arranged.
  • the spacer 322 is composed of, for example, a metal coil spring.
  • the pretensioner 3 according to the third embodiment shown in FIG. 6 (B) is an improvement of the elastic body 32e shown in FIG. 4 (D) to be the elastic body 32e of the pretensioner 3 shown in FIG. 6 (A). It was used.
  • the elastic body 32e shown in FIG. 6B includes a shaft member 32t, and the shaft member 32t has an annular diameter-expanded portion at a front end (end on the power transmission member 32a side) and a rear end (end on the piston 32d side).
  • the enlarged diameter portion on the rear end side is formed to have a smaller diameter than the enlarged diameter portion on the front end side. With such a configuration, the elastic body 32e can be easily inserted.
  • the enlarged diameter portion may be formed with a recess that can make surface contact with the rear end 321 of the power transmission member 32a.
  • a plurality of elastic bodies 32e are arranged in the axial direction of the guide member 32b.
  • two elastic bodies 32e of the same material and the same shape are prepared and inserted into the guide member 32b side by side in the front-rear direction.
  • the preceding elastic body 32e can be used as a protective member for the trailing elastic body 32e.
  • the plurality of elastic bodies 32e may be made of different materials or may have different shapes. Further, the number of elastic bodies 32e may be three or more.
  • the pretensioner 3 according to the fifth embodiment shown in FIG. 7 (A) is arranged between the elastic body 32e and the power transmission member 32a, and includes a resin protective member 323 that protects the elastic body 32e.
  • the protective member 323 is made of, for example, the same material as the power transmission member 32a.
  • the protective member 323 has, for example, a substantially T-shaped cross section, and includes a recess 323a that can come into surface contact with the rear end 321 of the power transmission member 32a, and a protrusion 323b that can be locked to the elastic body 32e.
  • the recess 323a may be omitted.
  • the elastic body 32e is provided with a fastening hole 324 into which the protrusion 323b can be inserted.
  • the protective member 323 can be connected to the elastic body 32e by forming the entrance of the fastening hole 324 narrowly and forming the tip of the protrusion 323b thick. By integrating the elastic body 32e and the protective member 323 in this way, it is possible to facilitate handling when assembling the pretensioner 3.
  • the protective member 323 is not necessarily a component that must be connected to the elastic body 32e, and the shapes of the protrusion 323b and the fastening hole 324 may be changed, or the protrusion 323b and the fastening hole 324 may be omitted, if necessary. You may.
  • the diameter of the protective member 323 is formed to be slightly smaller than the inner diameter Dp of the guide member 32b.
  • the diameter of the protective member 323 may be larger or smaller than the inner diameter Dr of the restraint portion 32g.
  • the pretensioner 3 according to the sixth embodiment shown in FIG. 7 (B) has a recess 325 formed at the rear end of the elastic body 32e shown in FIG. 7 (A). Further, the pretensioner 3 according to the seventh embodiment shown in FIG. 7 (C) has an annular groove portion 326 formed at the rear end of the elastic body 32e shown in FIG. 7 (A).
  • FIG. 8 is an overall configuration diagram showing a seatbelt device according to an embodiment of the present invention.
  • components other than the seatbelt device are shown by alternate long and short dash lines.
  • the seatbelt device 100 includes a webbing W for restraining an occupant, a retractor 1 for winding the webbing W, a guide anchor 101 provided on the vehicle body side for guiding the webbing W, and the like.
  • the retractor 1 includes, for example, a belt anchor 102 for fixing the webbing W to the vehicle body side, a buckle 103 arranged on the side surface of the seat S, and a tongs 104 arranged on the webbing W. have.
  • the seat S includes, for example, a seat portion S1 on which the occupant sits, a backrest portion S2 located on the back surface of the occupant, and a headrest portion S3 that supports the occupant's head.
  • the retractor 1 is built in, for example, the B-pillar R of the vehicle body. Further, in general, 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. One end of the webbing W is connected to the belt anchor 102, and the other end is connected to the retractor 1 via the guide anchor 101.
  • the webbing W is pulled out from the retractor 1 while sliding the insertion hole of the guide anchor 101. Further, when the occupant wears the seatbelt or releases the seatbelt when getting off, 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-mentioned seatbelt device 100 is a normal seatbelt device in the front seat to which the retractor 1 according to the above-described embodiment is applied. Therefore, according to the seatbelt device 100 according to the present embodiment, the through hole can be sealed by the elastic body 32e until the piston 32d collides with the restraint portion 32g, and the elastic body 32e holds the restraint portion 32g. After passing through, the working gas can be discharged from the through hole 32r, and the kinetic energy of the piston can be reduced.
  • the seatbelt device 100 according to the present embodiment is not limited to the application to the front seats, and can be easily applied to the rear seats by omitting 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 power transmission member 32a may have a metal sphere (ball) shape or a rack and pinion. It may be an and pinion drive type rack.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

La présente invention concerne un prétendeur, un rétracteur et un dispositif de ceinture de sécurité avec lesquels des contraintes sur la conception du prétendeur peuvent être relâchées tandis que la libération du gaz de travail est réduite au minimum.　Un dispositif de transmission de puissance motrice (32) comprend un élément de transmission de puissance motrice en forme de tige, fabriqué en résine (32a) qui transmet une puissance motrice à une couronne dentée (31), un élément de guidage tubulaire (32b) qui guide l'élément de transmission de puissance motrice (32a) vers la couronne dentée (31), un générateur de gaz (32c) qui fournit du gaz de travail à l'intérieur de l'élément de guidage (32b), un piston (32d) positionné entre le générateur de gaz (32c) et l'élément de transmission de puissance motrice (32a), un corps élastique (32e) positionné devant le piston (32d), un élément d'étanchéité (32f) positionné sur le côté arrière du piston (32d), et une partie de retenue (32g) qui limite le piston (32d) formé dans l'élément de guidage (32b).
PCT/JP2020/045893 2020-01-31 2020-12-09 Prétendeur, rétracteur et dispositif de ceinture de sécurité WO2021153022A1 (fr)

Priority Applications (1)

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JP2021574501A JP7265042B2 (ja) 2020-01-31 2020-12-09 プリテンショナ、リトラクタ及びシートベルト装置

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JP2020014522 2020-01-31
JP2020-014522 2020-01-31

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WO2021153022A1 true WO2021153022A1 (fr) 2021-08-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023114674A1 (fr) * 2021-12-13 2023-06-22 Autoliv Asp, Inc. Tube de prétension dans un ensemble rétracteur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020127586A1 (fr) 2018-12-18 2020-06-25 Philip Morris Products S.A. Procédé et appareil permettant de produire une feuille d'une matière contenant des alcaloïdes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4654204B2 (ja) * 2004-02-17 2011-03-16 オートリブ ディヴェロプメント アクチボラゲット 駆動停止部を備えた回転式テンショナ
US20150336538A1 (en) * 2014-05-23 2015-11-26 Autoliv Asp Retractor pretensioner assembly
JP2016523198A (ja) * 2013-06-05 2016-08-08 ティーアールダブリュー・オートモーティブ・ゲーエムベーハー ベルトテンショナー
US20180265035A1 (en) * 2017-03-17 2018-09-20 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a piston-safety valve member

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4654204B2 (ja) * 2004-02-17 2011-03-16 オートリブ ディヴェロプメント アクチボラゲット 駆動停止部を備えた回転式テンショナ
JP2016523198A (ja) * 2013-06-05 2016-08-08 ティーアールダブリュー・オートモーティブ・ゲーエムベーハー ベルトテンショナー
US20150336538A1 (en) * 2014-05-23 2015-11-26 Autoliv Asp Retractor pretensioner assembly
US20180265035A1 (en) * 2017-03-17 2018-09-20 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a piston-safety valve member

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023114674A1 (fr) * 2021-12-13 2023-06-22 Autoliv Asp, Inc. Tube de prétension dans un ensemble rétracteur

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JP7265042B2 (ja) 2023-04-25
JPWO2021153022A1 (fr) 2021-08-05

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