WO2012098784A1 - シートベルト用リトラクタ - Google Patents
シートベルト用リトラクタ Download PDFInfo
- Publication number
- WO2012098784A1 WO2012098784A1 PCT/JP2011/078657 JP2011078657W WO2012098784A1 WO 2012098784 A1 WO2012098784 A1 WO 2012098784A1 JP 2011078657 W JP2011078657 W JP 2011078657W WO 2012098784 A1 WO2012098784 A1 WO 2012098784A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- webbing
- ratchet gear
- pawl
- housing
- clutch
- Prior art date
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Classifications
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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
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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
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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
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
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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
- B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
- B60R22/4633—Linear actuators, e.g. comprising a piston moving along reel axis and rotating along its own axis
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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
- B60R22/4676—Reels with means to tension the belt in an emergency by forced winding up comprising energy-absorbing means operating between belt reel and retractor frame
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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
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
Definitions
- the present invention relates to a seat belt retractor for removing slack of webbing in an emergency such as a vehicle collision.
- the present invention has been made to solve the above-described problems, and the number of parts of the forced lock mechanism that prevents the winding drum from rotating in the webbing pull-out direction when the pretensioner mechanism is activated. It is an object of the present invention to provide a seatbelt retractor that can reduce the number of steps and speed up assembly work.
- a seatbelt retractor is attached to a housing, a take-up drum that is rotatably housed in the housing and winds and houses a webbing, and is attached to the outside of one side wall portion of the housing. And a pretensioner mechanism that winds the webbing by rotating the take-up drum in the take-up direction when the vehicle collides, and the take-up drum has one end side in the axial direction of the housing.
- a cover member that is rotatably supported on one side wall portion, and a shaft portion that is erected on the other end side in the axial direction is attached to the outside of the other side wall portion that faces the one side wall portion of the housing.
- the housing is formed on the other side wall and formed on the outer periphery of the edge of the other end in the axial direction of the winding drum.
- the ratchet gear has an opening through which the ratchet gear is inserted with a predetermined gap, and a plurality of internal teeth that are formed on the inner peripheral edge of the opening facing the ratchet gear and can be engaged with the ratchet gear.
- the cover member is plastically deformed through the shaft portion when the pretensioner mechanism portion is actuated and a tension of a predetermined value or more is applied to the webbing, and the ratchet gear is moved to the plurality of internal teeth. It locks in the engagement state engaged with.
- a cover member attached to the outside of the other side wall of the housing is provided. Then, it is plastically deformed through a shaft portion erected on the other axial end side of the winding drum. For this reason, a ratchet gear formed on the outer periphery of the end edge of the winding drum inserted through the opening formed in the other side wall of the housing is connected to a plurality of inner portions formed on the inner peripheral edge of the opening. Locks into engagement with teeth.
- the cover member attached to the outside of the other side wall portion of the housing is surely plastically deformed when the webbing is wound by the operation of the pretensioner mechanism, so that the winding drum can be rotated quickly in the webbing pull-out direction. It becomes possible to lock securely. Thereby, even after the pretensioner mechanism is actuated, the state where the rotation of the winding drum in the webbing pull-out direction is locked can be reliably maintained. Further, the winding drum can be allowed to rotate in the webbing winding direction, and the webbing can be reliably wound by rotating the winding drum in the winding direction by the operation of the pretensioner mechanism.
- a plurality of internal teeth that engage with the ratchet gear of the winding drum are provided on the inner peripheral edge of the opening formed in the other side wall of the housing, and a cover member is provided on the other side wall of the housing.
- the plurality of internal teeth may be formed at a pitch smaller than the pitch of the ratchet gear.
- the plurality of internal teeth are formed at a pitch smaller than the pitch of the ratchet gear, so that the ratchet gear is connected to the plurality of internal teeth when the take-up drum rotates in the webbing pull-out direction. It is possible to reliably reduce the delay time for engagement. Further, since the plurality of internal teeth are formed at a pitch smaller than the pitch of the ratchet gear, the radial thickness of the plurality of internal teeth can be reduced by burring or the like, and the tooth thickness can be increased. It becomes.
- the plurality of internal teeth are at least the webbing with respect to the rotation axis of the take-up drum in the inner peripheral edge of the opening facing the ratchet gear. It may be formed on the inner peripheral edge on the rotational direction side of the winding drum when the webbing is pulled out from the radial direction on the pulling side.
- the plurality of inner teeth are at least from the radial direction on the webbing pull-out side with respect to the rotation axis of the winding drum in the inner peripheral edge of the opening facing the ratchet gear. It is formed on the inner peripheral edge of the winding drum on the rotation direction side when the webbing is pulled out.
- a plurality of internal teeth are placed on the inner peripheral edge of the opening facing the moving direction of the ratchet gear formed on the outer periphery of the edge of the winding drum. It can be reliably provided.
- the cover member may be formed by molding a synthetic resin.
- the cover member is formed by molding a synthetic resin.
- FIG. 1 is an external perspective view of a seatbelt retractor according to the present embodiment. It is the perspective view which decomposed
- FIG. 18 is a cross-sectional view taken along arrow X1-X1 in FIG. It is the perspective view which looked at the drum guide from the attachment side of a wire plate. It is a partially expanded view which shows the bending path formed in the level
- movement explanatory drawing (lock state) of a webbing sensitive type locking mechanism It is operation
- FIG. 1 is an external perspective view of a seatbelt retractor 1 according to this embodiment.
- FIG. 2 is an exploded perspective view of the seat belt retractor 1 for each unit.
- the seat belt retractor 1 is a device for winding a webbing 3 of a vehicle, and includes a housing unit 5, a winding drum unit 6, a pretensioner unit 7, and a winding.
- a spring unit 8 and a lock unit 9 are included.
- the lock unit 9 is fixed to the side wall 12 of the housing 11 constituting the housing unit 5 as will be described later, and the webbing 3 is pulled out in response to a sudden pull-out of the webbing 3 or a rapid acceleration change of the vehicle. Start operation to stop.
- the pretensioner unit 7 provided with a pretensioner mechanism 17 (see FIG. 6 and the like), which will be described later, is formed from upper and lower end edges of the side plate portions 13 and 14 facing each other of the substantially U-shaped housing unit 5 in plan view.
- the screws 15 and the stopper screws 16 are screwed to the screwing portions 13A, 13B, 14A, and 14B that extend in a substantially right-angled inner direction and have screw holes.
- the pretensioner unit 7 constitutes the other side wall portion facing the side wall portion 12 of the housing 11.
- take-up spring unit 8 is fixed to each outside of the pretensioner unit 7 by each ny latch 8A formed integrally with a spring case 56 (see FIG. 5).
- the take-up drum unit 6 around which the webbing 3 is wound is rotatably supported between a lock unit 9 fixed to the side wall 12 of the housing unit 5 and the pretensioner unit 7.
- FIG. 3 is a perspective view of the winding drum unit 6.
- FIG. 4 is a sectional view of the seat belt retractor 1.
- FIG. 5 is an exploded perspective view of the winding drum unit 6, the pretensioner unit 7 and the winding spring unit 8.
- the winding drum unit 6 includes a guide drum 21, a drum shaft 22, a torsion bar 23, a wire 24, a wire plate 25, a ratchet gear 26, and a bearing 32. Has been.
- the guide drum 21 is formed of an aluminum material or the like, and is formed in a substantially cylindrical shape in which the end surface portion on the pretensioner unit 7 side is closed. Further, a flange portion 27 extending in the radial direction from the outer peripheral portion and further extending in a substantially right-angled outward direction is formed on the end edge portion on the pretensioner unit 7 side in the axial direction of the guide drum 21. . Further, on the inner peripheral surface of the flange portion 27, a clutch gear 30 to be engaged with each clutch pawl 29 at the time of a vehicle collision is formed as will be described later.
- a cylindrical mounting boss 31 is erected at the center position of the end surface portion of the guide drum 21 on the pretensioner unit 7 side, and a drum shaft 22 formed of a steel material or the like is fixed by press fitting or the like.
- a substantially cylindrical tubular portion 32A formed of a synthetic resin material such as polyacetal, and a bearing 32 in which a proximal end flange portion 32B is connected to the outer periphery of the proximal end portion. It is inserted.
- the take-up drum unit 6 is rotatably supported by a bearing portion 33A (see FIGS. 6 and 8) of a pinion gear body 33 formed of a steel material or the like constituting the pretensioner unit 7 via the bearing 32. .
- a shaft hole 21A formed so as to become gradually narrower along the central axis is formed inside the guide drum 21, and a steel material is provided at an end portion on the flange portion 27 side in the shaft hole 21A.
- a spline groove into which a spline 23A formed at one end of the torsion bar 23 formed by, for example, is press-fitted is formed.
- the torsion bar 23 is press-fitted and fixed in the guide drum 21 so as not to be relatively rotatable by inserting the spline 23A side of the torsion bar 23 into the shaft hole 21A of the guide drum 21 and press-fitting it until it contacts the flange portion 27.
- a flange portion 35 extending in the radial direction from the outer peripheral surface slightly inside from the end edge portion is formed. Further, a cylindrical step portion 36 having a slightly smaller outer diameter is formed on the outer side in the axial direction from the flange portion 35. In addition, a pair of protruding pins 37, 37 are erected on the outer end surface portion of the stepped portion 36 at positions facing each other in the radial direction.
- a convex portion (see FIG. 18) having a predetermined shape is formed on the outer surface of the flange portion 35 as will be described later, and a wire-like wire 24 made of a metal material such as stainless steel is formed in this convex portion shape.
- a wire-like wire 24 made of a metal material such as stainless steel is formed in this convex portion shape.
- it is mounted on the outer periphery of the base end of the stepped portion 36.
- the outer peripheral portion of the flange portion 35 is formed of an aluminum material or the like, and has a substantially oval shape in a side view in which a convex portion 38 into which the wire 24 protruding outward from the flange portion 35 is fitted is formed on the outer peripheral portion of the inner side surface.
- the wire plate 25 is covered.
- a through hole 40 through which the stepped portion 36 is inserted is formed in the center portion of the wire plate 25, and the outer peripheral portion on the outer side in the axial center direction of the through hole 40 is radially inward from the inner peripheral surface.
- a pair of fitting convex portions 41 formed so that two convex portions projecting in an arc shape are opposed to each other in the radial direction is provided.
- four pairs of caulking pins 39 are erected on the outer peripheral portion on the outer side in the axial direction sandwiched between the fitting convex portions 41 of the through hole 40 so as to face each other in the radial direction.
- a recessed portion 39A that is recessed in a semicircular arc shape by a predetermined depth is formed at the base end portion of each caulking pin 39.
- the ratchet gear 26 has a disk shape formed of a steel material or the like, and is formed with a cylindrical extension portion 42 extending from the outer peripheral portion to the same height as the step portion 36 in the axial direction.
- a ratchet gear portion 45 is formed on the outer peripheral surface of the extending portion 42.
- the ratchet gear portion 45 is locked in an engaged state engaged with an engagement gear portion 89 (see FIG. 10) formed with a plurality of internal teeth 88 (see FIG. 10) at the time of a vehicle collision.
- the pawl 43 see FIG. 9) is engaged.
- an anti-rotation flange 46 extending in the radial direction from the outer peripheral portion is formed at the end edge portion of the extending portion 42 on the axial direction guide drum 21 side, and further, a circularly inward in the radial direction is formed on the outer peripheral portion.
- a pair of fitting recesses 46B formed so that two recesses that are recessed in an arc shape face each other in the radial direction are provided (see FIG. 5).
- each recessed portion 46A is formed in a semicircular arc shape and is depressed by a predetermined depth.
- each through hole 47 into which each protrusion pin 37 is inserted is formed at a position facing each protrusion pin 37 of the ratchet gear 26.
- a recessed portion 47A that is recessed by a predetermined depth is formed around each through-hole 47.
- a shaft portion 48 is erected on the outer center position of the ratchet gear 26.
- a spline 48 ⁇ / b> A is formed on the outer peripheral surface of the shaft portion 48.
- the winding drum unit 6 is rotatably supported by the lock unit 9 via the shaft portion 48.
- a cylindrical fixed boss 49 is provided upright at the center of the inner surface of the ratchet gear 26.
- a spline 23 B formed on the other end side of the torsion bar 23 is formed on the inner peripheral surface of the fixed boss 49. Spline grooves into which are inserted are formed.
- the outer diameter of the spline 23B formed on the other end side of the torsion bar 23 is substantially the same as the outer diameter of the spline 23A formed on one end side of the torsion bar 23.
- each fitting recess 46B of the rotation prevention flange 46 of the ratchet gear 26 is inserted into each fitting projection 41 of the wire plate 25. Thereafter, each crimp pin 39 is crimped so as to spread inside the recess portion 39A of the base end portion thereof and the recess portion 46A of the detent flange 46 formed at the opposite position. Then, the wire 24 is attached to the outer surface of the flange portion 35 of the guide drum 21 (see FIG. 18).
- each projecting pin 37 is crimped so as to spread inside a recess 47 ⁇ / b> A formed around the through hole 47.
- the ratchet gear 26 and the wire plate 25 are fixed so as not to rotate relative to each other, and the ratchet gear 26 and the wire plate 25 rotate relative to the guide drum 21 via the torsion bar 23 and the protruding pins 37. Fixed to impossible.
- the webbing 3 is wound around the outer peripheral surface between the flange portion 27 of the guide drum 21 and the flange portion 35 and the wire plate 25.
- the winding spring unit 8 includes a winding attachment biasing mechanism 55 including a spiral spring, a spring case 56 that accommodates the winding attachment biasing mechanism 55, and a spring shaft 58. It is configured. And it fixes to each through-hole 51 of the cover plate 57 which comprises the outer surface of the pretensioner unit 7 formed with a steel material etc. via each ny latch 8A provided in three places of the spring case 56.
- FIG. 1 the winding attachment biasing mechanism 55 including a spiral spring, a spring case 56 that accommodates the winding attachment biasing mechanism 55, and a spring shaft 58. It is configured. And it fixes to each through-hole 51 of the cover plate 57 which comprises the outer surface of the pretensioner unit 7 formed with a steel material etc. via each ny latch 8A provided in three places of the spring case 56.
- the leading end of the drum shaft 22 of the winding drum unit 6 is coupled to a spiral spring via a spring shaft 58 in the spring case 56, and the winding drum unit 6 is always moved in the winding direction of the webbing 3 by the urging force of the spiral spring.
- the structure is energized.
- FIG. 6 is a perspective view of the pretensioner unit 7 as seen from the side of the mounting surface to the housing unit 5.
- FIG. 7 is a partially cutaway side view of the pretensioner unit 7.
- FIG. 8 is an exploded perspective view of the pretensioner unit 7 of FIG.
- the pretensioner unit 7 operates the gas generating member 61 at the time of a vehicle collision or the like, and uses the pressure of this gas to wind the winding through the flange portion 27 of the winding drum unit 6.
- a pretensioner mechanism 17 that rotates the take-up drum unit 6 in the winding direction of the webbing 3 is provided.
- the pretensioner mechanism 17 is formed on the gas generating member 61, the pipe cylinder 62, the seal plate 63 and the piston 64 that move in the pipe cylinder 62 under the gas pressure of the gas generating member 61, and the piston 64.
- the pinion gear body 33 that meshes with the rack and rotates, a base plate 65 to which the pipe cylinder 62 is attached, and a substantially rectangular parallelepiped shape disposed on the base plate 65 in contact with the side surface of the pipe cylinder 62 on the pinion gear body 33 side.
- the base block body 66 and a clutch mechanism 68 disposed on the outer surface of the base plate 65 are configured.
- the pinion gear body 33 has a substantially cylindrical shape formed of a steel material or the like, and a pinion gear portion 71 that meshes with a rack formed on the piston 64 is formed on the outer periphery thereof. Further, a cylindrical support portion 72 extending outward from the end portion of the pinion gear portion 71 on the axial direction cover plate 57 side is formed. The support portion 72 is formed to have a length substantially equal to the thickness dimension of the cover plate 57 with the valley diameter of the pinion gear portion 71 as the outer diameter.
- a flange portion 73 projecting in the radial direction is formed at an end portion of the pinion gear portion 71 on the axial base plate 65 side.
- a boss portion 74 is formed which is formed in a substantially cylindrical shape outward from the flange portion 73 and into which the drum shaft 22 of the winding drum unit 6 is inserted and in which a bearing portion 33A into which the bearing 32 is inserted is formed.
- three splines each having an outer diameter of the base end portion are formed at intervals of about 120 degrees of the central angle.
- the clutch mechanism 68 is formed of a substantially annular pawl base 76 formed of a steel material, three clutch pawls 29 formed of an aluminum material, and a synthetic resin such as polyacetal. Thus, it is comprised from the pawl base 76 and the substantially annular pawl guide 77 which clamps each clutch pawl 29 (refer FIG. 15 etc.).
- the inner peripheral diameter of the pawl guide 77 is formed larger than the spline groove of the pawl base 76, and the positioning projections 77A project at equal angles at three locations on the outer side surface of the pawl guide 77.
- each positioning protrusion 77A protruding from the outer side surface portion of the pawl guide 77 of the clutch mechanism 68 is fitted into each positioning hole 81 of the base plate 65 so that the clutch mechanism 68 is placed on the outer surface of the base plate 65. Deploy. Subsequently, as shown in FIG. 8, after the boss portion 74 of the pinion gear body 33 is fitted into the through hole 83 formed in the substantially central portion of the base plate 65, each spline formed in the boss portion 74 is moved to the clutch mechanism 68. Are press-fitted and fixed in each spline groove of the pawl base 76. Thereby, the clutch mechanism 68 and the pinion gear body 33 are disposed and fixed to the base plate 65, and the pinion gear portion 71 of the pinion gear body 33 is always positioned and fixed at the position shown in FIG.
- the base block body 66 is made of a synthetic resin such as polyacetal.
- the gear housing 85 is formed so as to be recessed in a semi-circular shape in plan view from the side edge on the inner side of the base block body 66 and formed in a ring shape with a bottom surface protruding outward.
- the flange portion 73 of the pinion gear body 33 is inserted into the through hole 82 in the bottom surface portion.
- each positioning boss 79 protruding from the side surface portion of the base block body 66 on the base plate 65 side is fitted into each positioning hole 80 of the base plate 65, and the base block body 66 is arranged on the inner surface of the base plate 65. .
- an elastic locking piece 66A extending from the outer side surface portion of the base block body 66 to the base plate 65 side and formed to be elastically deformable in the outer direction, and the base plate 65 from the lower side surface portion of the base block body 66.
- the elastic locking pieces 66 ⁇ / b> B that extend to the side and are elastically deformable in the outward direction are locked to the side end portions of the base plate 65.
- the base block body 66 is disposed on the base plate 65.
- a concave portion 86 opened to the cover plate 57 side is formed in the center portion of the base block body 66 to reduce the weight.
- the inner diameter of the through hole 83 formed in the substantially central portion of the base plate 65 is formed to a diameter that can support the outer diameter of the base end portion of the boss portion 74 of the pinion gear body 33, and rotates on one end side of the pinion gear body 33. It is configured to be possible to support. Further, the height of the gear housing 85 is formed to be substantially equal to the sum of the heights of the pinion gear 71 and the flange 73 of the pinion gear body 33.
- the pipe cylinder 62 is formed in a substantially L shape with a steel pipe material or the like. Then, one end side (the lower bent portion in FIG. 7) is formed with a substantially cylindrical storage portion 62 ⁇ / b> A to store the gas generating member 61.
- the gas generating member 61 includes explosives, and is configured to ignite the explosives according to an ignition signal from a control unit (not shown) and generate gas by combustion of the gas generating agent.
- the other end side (the upper bent portion in FIG. 7) of the pipe cylinder 62 is formed with a piston housing portion 62B having a substantially rectangular cross section, and a notch portion 111 is formed at a portion facing the pinion gear body 33, and the base plate When arranged on 65, the pinion gear portion 71 of the pinion gear body 33 is configured to fit into the notch 111.
- a bent portion 112 that is bent at a substantially right angle from the base plate 65 is fitted into the side surface portion on the base block body 66 side at the upper end portion of the piston housing portion 62B, so that the pipe cylinder 62 is prevented from coming off in the vertical direction.
- a functioning notch 113 is formed.
- a pair of opposing through-holes 114 that can be fitted with a stopper screw 16 that functions as a retaining member for the piston 64 and is attached to the housing unit 5 on both side surfaces of the lateral side of the notch 113 are provided. Is formed.
- the seal plate 63 is formed in a substantially rectangular plate shape that can be inserted from the upper end side of the piston housing portion 62B with a rubber material or the like.
- the seal plate 63 is formed with a pair of protrusions 63A that extend upward from both end edges in the longitudinal direction and protrude inward over the entire width of each upper end.
- a gas vent hole 63 ⁇ / b> B is formed at the center of the seal plate 63.
- the piston 64 is formed of a steel material or the like, has a substantially rectangular cross section that can be inserted from the upper end side of the piston housing portion 62B, and has a long shape as a whole. Further, in the lower end portion of the piston 64, insertion grooves 64A into which the projections 63 of the seal plate 63 are fitted from the lateral direction are formed. In addition, a communication hole 64C having a small diameter is formed in the lower end surface of the piston 64 so as to communicate with the through hole 64B formed in the side surface portion of the piston 64 from the lower end surface.
- the respective projections 63A of the seal plate 63 are slid into the respective insertion grooves 64 of the piston 64 from the lateral side, and are then press-fitted from the upper end side of the piston housing portion 62B with the seal plate 63 at the back side. Further, the gas vent hole 63B of the seal plate 6 communicates with the through hole 64B via the communication hole 64C of the piston 64.
- the seal plate 63 is pressed by the pressure of the gas generated by the gas generating member 61, and the piston 64 moves to the upper end side opening (the upper end in FIG. 7) of the piston accommodating portion 62B. Further, when the webbing 3 is pulled out again as described later, when the piston 64 is lowered downward by the reverse rotation of the pinion gear body 33, the gas vent hole 63B of the seal plate 63, the communication hole 64C of the piston 64, and the through hole The gas in the pipe cylinder 62 is released through 64B, and the piston 64 is smoothly lowered.
- a rack 116 that meshes with the pinion gear portion 71 of the pinion gear body 33 is formed on the side surface of the piston 64 on the pinion gear body 33 side. Further, a stepped portion 117 capable of contacting the stopper screw 16 is formed on the back surface of the front end portion (the upper end portion in FIG. 7) of the rack 116. Further, as shown in FIG. 7, in a normal state until the gas generating member 61 is operated, the piston 64 is retracted to the back side of the piston housing part 62B, and the tip of the rack 116 is not engaged with the pinion gear part 71. It is located to become.
- the protruding portions that protrude outward from both side edge portions of the gear storage portion 85 of the base block body 66 are formed inside the notch portion 111 of the piston storage portion 62 ⁇ / b> B configured as described above.
- the bent portion 112 of the base plate 65 is inserted into the notch 113 formed at the upper end of the piston accommodating portion 62B, and the pipe cylinder 62 is disposed on the base plate 65.
- the rack stop pin 108 erected on the base block body 66 and having a substantially U-shaped cross section is inserted into the gear groove at the upper end of the rack 116, and the vertical movement of the piston 64 is restricted.
- the tip end portion of the piston 64 is located in the vicinity of the pinion gear portion 71 of the pinion gear body 33 and is in a non-meshing state.
- the piston accommodating portion 62B of the pipe cylinder 62 is separated from each rib 110 having a substantially triangular cross-section standing on the side surface portion of the base block body 66 and the portion facing the pinion gear body 33 on the side edge of the base plate 65. Both side surface portions are supported by the back support portions 118A and 118B extending substantially at right angles. Each of the back support portions 118A and 118B extends so as to be slightly higher than the piston housing portion 62B, and is formed at a side end portion of the cover plate 57 facing the back support portions 118A and 118B.
- the through holes 119A and 119B are formed to be insertable.
- the side edge portions of the through holes 119A and 119B facing the outer side surfaces of the back support portions 118A and 118B have a predetermined height (for example, a height of about 1 mm) in the inner direction (left side direction in FIG. 8). There is a depression. Thereby, when each back support part 118A, 118B is inserted in each through-hole 119A, 119B, the inner surface of each through-hole 119A, 119B is surely contacted with the outer surface of each back support part 118A, 118B. It is configured to touch.
- the positioning bosses 121 projecting from the side surface portion of the base block body 66 on the cover plate 57 side are connected to the positions of the cover plate 57.
- the cover plate 57 is placed on the upper side of the base block body 66, the pipe cylinder 62 and the like by being fitted into the determination hole 122.
- the cylindrical support portion 72 of the pinion gear body 33 is fitted into the support hole 125 formed in the substantially central portion of the cover plate 57.
- the back support portions 118A and 118B extending substantially at right angles from the side edge portions of the base plate 65 are passed through the through-holes formed at the side edge portions of the cover plate 57 facing the back support portions 118A and 118B.
- the holes 119A and 119B are inserted.
- An elastic locking piece 66C that extends from the outer side surface of the base block body 66 toward the cover plate 57 and is elastically deformable in the outer direction, and a cover from the upper side surface of the base block body 66.
- Elastic locking pieces 66 ⁇ / b> D that extend toward the plate 57 side and are formed so as to be elastically deformable in the outward direction are respectively locked to the side end portions of the cover plate 57.
- the cover plate 57 is disposed and fixed to the base block body 65, and the pipe cylinder 62 is attached between the cover plate 57 and the base plate 65.
- the support portion 72 formed at the end of the pinion gear body 33 is rotatably supported by the support hole 125 of the cover plate 57. Therefore, as shown in FIG. 4, the base end portion of the boss portion 74 and the support portion 72 formed at both ends of the pinion gear body 33 are respectively formed by the through hole 83 of the base plate 65 and the support hole 125 of the cover plate 57. It is rotatably supported.
- the through holes 114 of the pipe cylinder 62, the through holes 127 formed at positions facing the through holes 114 of the cover plate 57, and the through holes formed at positions facing the through holes 114 of the base plate 65. 128 is arranged on the same axis. Accordingly, the stopper screw 16 formed of steel or the like can be inserted from the cover plate 57 side to the base plate 65 side and screwed into the screw hole 141B (see FIG. 9) of the housing 11.
- the pipe cylinder 62 is sandwiched between the cover plate 57 and the base plate 65, and both side surfaces are sandwiched between the base block body 66 and the backrest portions 118A and 118B. Further, the upper end side opening of the piston accommodating portion 62 ⁇ / b> B of the pipe cylinder 62 is covered with a cover portion 131 that extends substantially at a right angle from the upper end portion of the cover plate 57. Further, when the seal plate 63 is pressed by the pressure of the gas generated by the gas generating member 61 and the piston 64 moves to the upper end side opening (upper end in FIG. 7) of the piston housing portion 62B, the piston The 64 stepped portions 117 can be brought into contact with the stopper screws 16 inserted through the respective through holes 114 and stopped.
- FIG. 9 is an exploded perspective view of the housing unit 5.
- FIG. 10 is a side view of the seatbelt retractor 1 with the lock unit 9 removed.
- the housing unit 5 includes a housing 11, a bracket 133, a protector 135, a pawl 43, and a pawl rivet 136.
- the housing 11 is formed of a steel material or the like in a substantially U shape in plan view, and the ratchet gear portion 45 of the ratchet gear 26 of the winding drum unit 6 is formed in a predetermined gap (for example, about A through hole 137 is formed while being inserted while forming a gap of 0.3 mm to 0.5 mm.
- the inner peripheral edge portion of the through hole 137 is configured to be recessed inward by a predetermined depth toward the winding drum unit 6 and to face the ratchet gear portion 45 of the ratchet gear 26 of the winding drum unit 6.
- the plurality of internal teeth 88 are formed so as to incline in the rotational direction in which the webbing 3 of the winding drum unit 6 is wound up. Therefore, only when the ratchet gear 26 rotates in the pulling-out direction of the webbing 3, the ratchet gear portion 45. It is formed so that it may engage with.
- the engagement gear portion 89 formed with a plurality of internal teeth 88 has a webbing 3 with respect to the rotation axis 48B of the shaft portion 48 standing on the ratchet gear 26 in the inner peripheral edge portion of the through hole 137. From the radial direction parallel to the pulling direction (upward direction in FIG. 10) from the radial direction to the rotation direction side of the take-up drum unit 6 when the webbing 3 is pulled out. ing.
- the engagement gear portion 89 formed with a plurality of internal teeth 88 has a webbing 3 with respect to the rotation axis 48B of the shaft portion 48 erected on the ratchet gear 26 in the inner peripheral edge portion of the through hole 137.
- the webbing 3 is provided on the inner peripheral edge at a central angle of about 180 degrees on the drawing direction side (upper side in FIG. 10) of the webbing 3 from the diameter perpendicular to the drawing direction (upward direction in FIG. 10). You may do it.
- the ratchet gear portion 45 of the ratchet gear 26 can be reliably engaged with the plurality of internal teeth 88.
- the pitch of the plurality of internal teeth 88 of the engagement gear portion 89 provided at the inner peripheral edge of the through hole 137 is formed to be about 1 ⁇ 2 of the pitch of the ratchet gear portion 45 of the ratchet gear 26.
- the tooth height of the inner teeth 88 is formed to be smaller than the tooth height of the ratchet gear portion 45.
- a notch 138 is formed in a portion of the through hole 137 facing the diagonally lower pawl 43 so that the pawl 43 can smoothly rotate.
- a through hole 139 for rotatably mounting the pawl 43 is formed on the lateral side of the notch 138.
- a semicircular guide portion 140 is formed on the concentric circle of the through hole 139 at the portion where the pawl 43 of the cutout portion 138 contacts.
- the portion of the pawl 43 that slides in contact with the guide portion 140 has a height substantially equal to the thickness dimension of the side wall portion 12, and a step portion 43 ⁇ / b> B that is recessed in an arc shape with the same radius of curvature as the guide portion 140. Is formed.
- a guide pin 43 ⁇ / b> A that is inserted into the guide groove 202 ⁇ / b> F of the clutch 202 that constitutes the lock unit 9 is erected at the tip of the outer side surface of the pawl 43 as will be described later.
- each of the side plate portions 13 and 14 facing each other are extended from both side edge portions of the side wall portion 12.
- an opening is formed in the central portion of each of the side plate portions 13 and 14 to reduce the weight and improve the efficiency of attaching the webbing 3.
- screw fixing portions 13A, 13B, 14A, and 14B that extend in a substantially right-angled inner direction with a predetermined width are formed on the upper and lower end edge portions of the side plate portions 13 and 14, respectively.
- each screw-fastening portion 13A, 13B, 14A is formed with a screw hole 141A to which each screw 15 is screwed
- the screw-fastening portion 14B has a screw hole 141B to which the stopper screw 16 is screwed. Is formed by burring.
- bracket 133 attached to the upper edge portion of the side plate portion 13 by the rivets 134 is formed of a steel material or the like, and webbing is performed on an extending portion that extends substantially inwardly from the upper edge portion of the side plate portion 13.
- a horizontally long through-hole 142 from which 3 is pulled out is formed, and a horizontally long frame-shaped protector 135 formed of a synthetic resin such as nylon is fitted therein.
- the pawl 43 formed of steel or the like can be rotated by a pawl rivet 136 that is rotatably inserted into the through-hole 139 from the outside of the side wall portion 12 with the stepped portion 43B being in contact with the guide portion 140. It is fixed to.
- the side surface of the pawl 43 and the side surface of the ratchet gear 26 are positioned so as to be substantially flush with the outer surface of the side wall portion 12. Further, the pawl 43 is not engaged with the ratchet gear 26 at the normal time.
- FIG. 11 is a partial cross-sectional view showing a configuration in which the retractor 1 for the seat belt is connected to the take-up drum unit 6 and the take-up spring unit 8 with the pretensioner unit 7 interposed therebetween, and the cross-sectional view of FIG. It is the figure seen from.
- the guide drum 21 is coaxially connected to the winding spring unit 8 via the drum shaft 22.
- the guide drum 21 is always urged in the winding direction of the webbing 3 by the winding spring unit 8.
- the clutch mechanism 68 that protrudes from the base plate 65 is housed in the drum recess 21 ⁇ / b> B of the guide drum 21.
- the bearing 32 is slidably provided between the guide drum 21 and the pinion gear body 33.
- the bearing 32 includes a cylindrical portion 32A having a cylindrical shape, and a proximal end flange portion 32B continuously provided at one end of the cylindrical portion 32A and extending in the outer diameter direction, and the guide drum 21 and the pinion gear body. 33 is slidably mounted between the two.
- the pinion gear body 33 and the clutch mechanism 68 are configured to slidably contact the guide drum 21 via the bearing 32.
- the rotation of the guide drum 21 when the webbing 3 is pulled out and taken up can be freely performed without being restricted by the pinion gear body 33 and the clutch mechanism 68 of the pretensioner unit 7.
- FIG. 12 is a plan view of the seatbelt retractor 1 as viewed from the winding spring unit 8 side.
- 13 and 14 are perspective views for explaining the relationship among the guide drum 21, the clutch mechanism 68, and the base plate 65.
- FIG. In order to explain the relationship among the guide drum 21, the clutch mechanism 68, and the base plate 65, the constituent members of the pretensioner unit 7, the winding spring unit 8, the drum shaft 22 and the like are omitted as appropriate.
- the state (displayed with a dotted line) where part or all of the members was seen through was displayed as needed.
- the clutch mechanism 68 is assembled coaxially with the guide drum 21. This is because the clutch mechanism 68 is coaxially connected to the pinion gear body 33 through the through hole 83 of the base plate 65, and the inner surface of the bearing portion 33 ⁇ / b> A of the pinion gear body 33 rotates through the outer surface of the mounting boss 31 and the bearing 32. This is because it is slidably positioned.
- a clutch gear 30 is engraved on the peripheral edge of the guide drum 21 that constitutes the drum recess 21B toward the axis.
- the clutch pawl 29 housed in the clutch mechanism 68 protrudes when the pretensioner mechanism 17 is operated.
- the protruding clutch pawl 29 engages with the clutch gear 30 to rotate the winding drum unit 6 in the winding direction of the webbing 3.
- a positioning protrusion 77A is provided on a surface of the clutch mechanism 68 that contacts the base plate 65, and is engaged with a positioning hole 81 opened in the base plate 65.
- the positioning protrusion 77A is formed on a pawl guide 77 constituting the clutch mechanism 68.
- the pawl guide 77 is fixed so as not to rotate relative to the base plate 65 at the initial stage during normal operation and vehicle collision.
- FIG. 15 and 16 are exploded perspective views showing the configuration of the clutch mechanism 68.
- FIG. FIG. 15 is an exploded perspective view seen from the winding spring unit 8 side
- FIG. 16 is an exploded perspective view seen from the winding drum unit 6 side.
- the clutch mechanism 68 includes a pawl base 76, a clutch pawl 29, and a pawl guide 77.
- a through hole 29 ⁇ / b> A is opened at the base end of the clutch pawl 29 and is press-fitted into a cross-shaped protrusion 77 ⁇ / b> B protruding from the pawl guide 77.
- the length of one side of the cross shape of the cross-shaped protrusion 77B is longer than the diameter of the through hole 29A of the clutch pawl 29, and restricts the rotation of the clutch pawl 29 in the press-fitted state. In this case, a chamfering process is performed on the through hole 29 ⁇ / b> A on the surface side facing the pawl guide 77 in the clutch pawl 29.
- the cross-shaped projection 77B is formed such that the length of one side of the cross shape is short at the tip, or the tip is compared with other parts. It may be formed thin. Thereby, the press-fitting work can be performed smoothly.
- a recess 29C is provided at an intermediate position between the through hole 29A and the engaging tooth 29B, and a protrusion 77E is provided at a corresponding position of the pawl guide 77.
- the protrusion 77E and the recess 29C are fitted.
- the arrangement position of the recess 29C and the protrusion 77E has an effect of determining the rotational position of the clutch pawl 29 press-fitted into the cross-shaped protrusion 77B. This is a configuration for positioning the clutch pawl 29 press-fitted into the cross-shaped projection 77B at the storage position.
- a guide portion 77C is provided close to each side of the clutch pawl 29 on the side surface on the inner diameter side of the pawl guide 77.
- the pawl guide 77 is in a non-rotatable state. This is because the positioning protrusion 77A is engaged with the base plate 65. In this state, the pawl base 76 rotates. The clutch pawl 29 pressed by the pawl support block 76B as it rotates moves in the rotational direction while breaking the cross-shaped projections 77B and the projections 77E. In the moved clutch pawl 29, the side surface on the inner diameter side of the clutch pawl 29 is pressed against the guide portion 77C.
- the clutch pawl 29 Since the pawl base 76 further rotates, the clutch pawl 29 is pressed against the pawl support block 76B and the guide portion 77C. As a result, the clutch pawl 29 is slidably guided in the outer diameter direction by the guide portion 77C and protrudes in the outer diameter direction.
- the pawl base 76 is provided with an insertion hole 76A.
- the protruding length of the cross-shaped protrusion 77B is longer than the thickness of the clutch pawl 29.
- the tip of the cruciform protrusion 77B protrudes from the opposite side of the through hole 29A of the clutch pawl 29.
- the pawl guide 77 and the pawl base 76 are fitted, a portion of the cross-shaped projection 77B that protrudes from the clutch pawl 29 is fitted into the insertion hole 76A.
- a thick pawl support block 76B is provided so as to surround the insertion hole 76A on the outer diameter side of the pawl base 76.
- the pawl support block 76B is provided to receive a load received by the clutch pawl 29 when the clutch pawl 29 presses and drives the guide drum 21 at the time of a vehicle collision.
- the clutch pawl 29 is provided with engagement teeth 29B that engage with the clutch gear 30 at the tip.
- three clutch pawls 29 are arranged. When each clutch pawl 29 press-drives the guide drum 21 when the pretensioner mechanism 17 is operated, it is possible to disperse the load accompanying the pressing drive and to realize efficient pressing performance and load-bearing performance.
- a locking block 76C is formed at the outer diameter end of the pawl support block 76B. Further, a recess 76D is opened at one corner of the pawl support block 76B in the vicinity of the locking block 76C.
- the pawl guide 77 is formed with a locking hook 77D that engages with the locking block 76C and a cross-shaped projection 77F that engages with the recess 76D when the pawl base 76 is fitted.
- the engagement between the locking block 76C and the locking hook 77D is in an engagement state in which the pawl base 76 can rotate relative to the pawl guide 77 in the initial stage of rotation by the pinion gear body 33.
- the pawl base 76 rotates with the pawl guide 77 being kept unrotatable, and the clutch pawl 29 protrudes.
- the cross-shaped projection 77F fitted to the recess 76D is broken in accordance with the rotation of the pawl base 76.
- the pawl base 76 and the clutch pawl 29 are made of a metal member, and the pawl guide 77 is made of a resin member.
- the protrusion operation of the clutch pawl 29 and the rotation operation integrally with the pawl base 76 of the pawl guide 77 after the protrusion of the clutch pawl 29 and the reverse rotation restricting operation of the pawl base 76 can be performed easily and reliably. .
- the pretensioner mechanism 17 is operated, and the ratchet gear 26 of the winding drum unit 6 is engaged with the plurality of internal teeth 88 of the engagement gear portion 89 provided on the side wall portion 12 of the housing 11.
- the winding drum unit 6 is provided with a wire 24, a torsion bar 23, and the like as an energy absorbing mechanism that absorbs impact energy generated by the passenger by pulling out the webbing 3 under a predetermined load.
- FIG. 17 is a cross-sectional view including the axis of the winding drum unit 6 and the caulking pin 39.
- 18 is a cross-sectional view taken along arrow X1-X1 in FIG.
- FIG. 19 is a perspective view of the drum guide 21 as viewed from the wire plate 25 attachment side.
- FIG. 20 is a partially enlarged view showing a bent path formed in the step portion 36 of the drum guide 21.
- FIG. 21 is a partially enlarged view showing a bent path of the wire plate 25.
- a drum shaft 22 is fixed to the center position of the end surface portion of the guide drum 21 constituting the winding drum unit 6 on the pretensioner unit 7 side by press-fitting or the like.
- a bearing 32 is fitted into the base end portion of the drum shaft 22.
- a spline 23A of the torsion bar 23 is press-fitted and fixed to the inner side of the shaft hole 21A of the guide drum 21 so as not to be relatively rotatable.
- the bent portion 24 ⁇ / b> A at one end of the wire 24 is fitted and held on the outer peripheral portion of the step portion 36 having a substantially circular shape in front view formed on the outer surface of the flange portion 35 of the guide drum 21.
- a bent path 145 is integrally formed.
- the curved path 145 includes a convex portion 147 that is formed in a substantially trapezoidal shape that protrudes from the outer surface in the axial direction of the flange portion 35 and that faces the lower side in front view, and a convex portion on the outer periphery of the step portion 36.
- two opposing ribs 151 are provided on the opposing surfaces of the convex portion 147 and the concave portion 148 along the depth direction of the bending path 145.
- a pair of ribs 152 is provided on the opposing surface of the groove 149 along the depth direction of the curved path 145. Further, the distance between the opposing ribs 151 and 152 is formed to be smaller than the outer diameter of the wire 24.
- the bent portion 24A at one end of the wire 24 is fitted and fixedly held in the bent path 145 while crushing the ribs 151 and 152.
- a frontal bent portion 24 ⁇ / b> B formed continuously from the bent portion 24 ⁇ / b> A of the wire 24 is formed to protrude outward from the outer periphery of the flange portion 35.
- a bent portion 24 ⁇ / b> C formed continuously with the bent portion 24 ⁇ / b> B of the wire 24 is formed in an arc shape along the outer peripheral surface of the stepped portion 36.
- the inner periphery of the through hole 40 of the wire plate 25 is substantially opposite to the outer periphery of the stepped portion 36, and at the peripheral portion of the through hole 40. Is formed with an accommodating recess 155 that accommodates the wire 24, the flange portion 35, and the convex portion 147. In addition, the accommodation recess 155 is formed so that the diameter of the inner peripheral surface covering the outer periphery of the flange portion 35 is substantially equal to the outer diameter of the flange portion 35.
- a bulging portion 155A bulging outward in the radial direction to accommodate the bent portion 24B is formed in a portion of the receiving recess 155 that faces the bent portion 24B of the wire 24.
- a convex portion 38 having a generally chevron shape when viewed from the front is integrally formed on the inner side surface of the bulging portion 155A so as to form a bending path 156 in which the wire 24 is slidably guided.
- the radially inner end surface portion of the wire plate 25 of the convex portion 38 is formed in an arc shape along the outer peripheral surface of the step portion 36.
- the wire 24 is attached to the guide drum 21 by first press-fitting and fixing the spline 23 ⁇ / b> A of the torsion bar 23 on the inner side of the shaft hole 21 ⁇ / b> A of the guide drum 21. Subsequently, the bent portion 24 ⁇ / b> A of the wire 24 is pushed into the bent path 145 formed in the stepped portion 36, and the bent portion 24 ⁇ / b> C is disposed along the outer peripheral surface of the stepped portion 36.
- the convex portion 38 of the wire plate 25 is inserted into the bent portion 24B of the wire 24, the bent portion 24B of the wire 24 is inserted into the bent path 156, and the peripheral portion of the through hole 40 is applied to the wire 24.
- the wire 24, the stepped portion 36 and the convex portion 147 are accommodated in the accommodating concave portion 155.
- the spline 23B formed on the other end side of the torsion bar 23 is fitted into the fixed boss 49 of the ratchet gear 26, and the protruding pins 37 of the guide drum 21 inserted into the through holes 47 are inserted. Caulking.
- the ratchet gear 26 and the wire plate 25 are fixed to the guide drum 21 so as not to rotate relative to each other via the protruding pins 37.
- the ratchet gear 26 and the wire plate 25 are fixed to the torsion bar 23 so as not to rotate relative to each other by caulking each caulking pin 39 of the wire plate 25.
- the lock unit 9 Is provided with two types of locking mechanisms that lock the rotation of the winding drum unit 6. They are a webbing sensitive lock mechanism that operates when a webbing is suddenly pulled out, and a vehicle body sensitive lock mechanism that operates in response to acceleration caused by a vehicle swinging or tilting.
- lock mechanism two types of lock mechanisms for operating the lock unit 9 to lock the rotation of the take-up drum unit 6 are described as “emergency” in order to clearly distinguish them from a forced lock mechanism that operates and locks the pretensioner mechanism 17. This will be referred to as a “locking mechanism”.
- FIG. 22 is an exploded perspective view of the lock unit 9 constituting the emergency lock mechanism.
- FIG. 4 shows a cross-sectional view.
- the lock unit 9 is a unit that performs operations of the webbing sensitive lock mechanism and the vehicle body sensitive lock mechanism.
- the lock unit 9 includes a mechanism block 201, a clutch 202, a pilot arm 203, a return spring 204, a vehicle sensor 205, a locking gear 206, a sensor spring 207, a lock arm 208, an inertia mass 209, and a mechanism cover 210.
- a rib 202 ⁇ / b> A is provided on the outer peripheral edge of the substantially disc-shaped clutch 202.
- the clutch 202 is rotatably attached to the mechanism block 201.
- the return spring 204 is held between the mechanism block 201 and the protruding holding portions 201B and 202B of the clutch 202, which are opposed to each other at the upper end of the lock unit 9, and the clutch 202 is attached to a predetermined position. Rush.
- the mechanism block 201 is open at the center.
- the opening shape has a substantially inverted bowl shape.
- the large-diameter opening has a diameter larger than the outer diameter of the ratchet gear 26 and smaller than the outer diameter of the clutch 202.
- the rear surface of the clutch 202 and the ratchet gear 26 are disposed close to and opposed to each other in the large-diameter opening.
- a connecting portion between the small diameter opening and the large diameter opening provides a movable region of the pawl 43, and the pawl 43 pivotally supported by the housing 11 by the pawl rivet 136 is disposed.
- the pawl 43 is engaged with the ratchet gear portion 45 of the ratchet gear 26 by the rotation of the pawl 43 to the large-diameter opening.
- a sensor placement portion 201C is provided on the opposite side of the small-diameter opening (the lower left corner in FIG. 22), and the vehicle sensor 205 is placed on the ball sensor 205C.
- the vehicle sensor lever 205A is placed facing upward.
- the clutch 202 has an opening 202C at the center.
- the shaft portion 48 of the ratchet gear 26 disposed in proximity is loosely fitted.
- a clutch tooth 202D with which the lock arm 208 engages is erected on the front surface of the clutch 202 in an annular shape in the direction coaxial with the opening 202C and toward the axial center.
- a mounting pin 202E and a guide groove 202F are provided at a substantially lower central portion of the clutch 202.
- the mounting pin 202E is provided on the front side, and the pilot arm 203 is pivotally supported so as to be rotatable.
- the pilot arm 203 is pushed and pushed up by the vehicle sensor lever 205A.
- the guide groove 202F is provided on the back side, and the guide pin 43A of the pawl 43 is loosely fitted.
- the guide groove 202F is formed to approach the axial center of the opening 202C toward the left. Accordingly, the pawl 43 is guided so as to approach the ratchet gear 26 as the clutch 202 rotates counterclockwise.
- a guide block 202G extends from the mounting pin 202E to the lower left.
- the guide block 202G is provided to face the lever base 205B of the vehicle sensor 205.
- the guide block 202G has a tapered structure that expands downward as it extends leftward from the mounting pin 202E.
- the tip is an area having a certain width.
- the locking gear 206 has an annular groove 206D (see FIG. 4) in which the clutch teeth 202D of the clutch 202 standing in an annular shape are housed on the back side.
- the locking gear 206 is disposed in contact with or close to the clutch 202 so that the groove 206D surrounds the clutch teeth 202D.
- a cylindrical fixed boss 206E is erected at the center of the locking gear 206 so as to penetrate from the front side to the back side.
- the outer peripheral surface of the shaft portion 48 is provided on the inner peripheral surface of the fixed boss 206E.
- a spline groove into which the spline 48A formed in this is inserted is formed.
- the shaft portion 48 loosely fitted into the opening 202C is fitted into the fixed boss 206E of the locking gear 206, and the ratchet gear 26 and the locking gear 206 of the winding drum unit 6 are press-fitted and fixed coaxially so as not to be relatively rotatable.
- an opening 206C that passes through the groove 206D is provided at one corner on the outer peripheral end side of the locking gear 206.
- a shaft support pin 206B is provided in the vicinity of the opening 206C.
- the lock arm 208 is pivotally supported by the pivot pin 206B so that the tip end portion of the lock arm 208 can rotate from the opening 206C toward the outer groove 206D.
- the lock arm 208 is connected to the locking gear 206 by the sensor spring 207, and is urged so that the tip portion does not protrude from the opening 206C during normal operation. During the locking operation by the webbing sensitive lock mechanism, the lock arm 208 projects into the groove 206D through the opening 206C, and the tip of the lock arm 208 engages with the clutch teeth 202D.
- locking gear teeth 206A are engraved on the outer peripheral edge of the locking gear 206 in the outer diameter direction.
- the locking gear 206 is disposed on the back side of the clutch 202 so that the fixed boss 206E is fitted into the opening 202C of the clutch 202 and the locking gear teeth 206A are close to the pilot arm 203.
- the pilot arm 203 is pushed up by the vehicle sensor lever 205A of the vehicle sensor 205, and the tip of the pilot arm 203 is engaged with the locking gear teeth 206A.
- a substantially disc-shaped inertia mass 209 is rotatably attached to the front surface of the locking gear 206.
- the inertia mass 209 has a guide opening 209A.
- a guide pin 208A protruding from the lock arm 208 is loosely fitted into the guide opening 209A.
- the inertia mass 209 is a member that generates a delay in inertia with respect to a sudden webbing withdrawal, and is formed of a metal member.
- the guide opening 209A only needs to be functionally provided, but for the purpose of generating inertial delay, a dummy guide opening 209A is provided at a point-symmetrical position with respect to the center point of the inertia mass 209. .
- the front surface of the lock unit 9 is covered with a mechanism cover 210 formed of synthetic resin.
- the mechanism cover 210 is a substantially box-shaped cover case that is open on the housing 11 side.
- the mechanism cover 210 is provided with nai latches 210A having the same configuration as the ny latch 8A at three positions, the upper corners and the center of the lower edge. Yes.
- a cylindrical support boss 210 ⁇ / b> B is erected at the center of the mechanism cover 210 on the housing 11 side, and a fixed boss 206 ⁇ / b> E protruding from the front surface of the locking gear 206 is slidably fitted therein.
- the lock unit 9 is provided with a return spring 204, a clutch 202, a pilot arm 203, a vehicle sensor 205, a lock gear 206, a lock arm 208, and an inertia mass 209 in the mechanism block 201.
- the fixed boss 206 of the lock gear 206 is fitted into the support boss 210 ⁇ / b> B of the mechanism cover 210, and each ny latch 210 ⁇ / b> A is inserted into each opening 201 ⁇ / b> D of the mechanism block 201.
- the lock unit 9 inserts the shaft portion 48 loosely fitted into the opening 202C of the mechanism block 201 into the fixed boss 206E of the lock gear 206 via the opening 202C of the clutch 202, and then each ny latch 210A of the mechanism cover 210. Is fixed to the outside of the side wall portion 12 by pushing it into the respective through holes 52 provided at three locations on the side wall portion 12 of the housing 11.
- the shaft portion 48 of the winding drum unit 6 is rotatably supported by the support boss 210B of the mechanism cover 210 attached to the outside of the side wall portion 12 of the housing 11 via the lock boss 206E of the lock gear of the lock unit 9. Is done.
- the lock unit 9 is made of a resin member except the inertia mass 209, the return spring 204, the sensor spring 207, and the metal ball of the vehicle sensor 205, and the coefficient of friction between the members when they are in contact with each other is It is a small thing.
- the webbing 3 is pulled out in the direction indicated by the arrow in the drawing.
- the counterclockwise rotation direction is the rotation direction of the winding drum unit 6 when the webbing 3 is pulled out.
- the operation related to the locking operation will be mainly described, and description of other portions will be omitted as appropriate.
- a part of the drawing is cut out and displayed as necessary.
- the operation of the pawl 43 is common in both the webbing sensitive lock mechanism and the vehicle body sensitive lock mechanism. For this reason, in the following description, about the part which shows the relationship between the pawl 43 and the ratchet gear 26, the part is displayed as a notch state.
- [Description of webbing-sensitive locking mechanism] 23 to 25 are operation explanatory views of the webbing sensitive locking mechanism.
- the webbing sensitive lock mechanism in addition to the portion indicating the relationship between the pawl 43 and the ratchet gear 26, the portion indicating the relationship between the lock arm 208 and the clutch teeth 202D and the portion of the sensor spring 207 are cut out and displayed. Yes.
- the sensor spring 207 cannot maintain the initial position of the inertia mass 209. That is, an inertia delay occurs in the inertia mass 209, and the locking gear 206 rotates counterclockwise with respect to the inertia mass 209.
- [Explanation of body-sensitive locking mechanism] 26 to 28 are operation explanatory views of the vehicle body sensitive locking mechanism.
- a portion indicating the relationship between the pawl 43 and the ratchet gear 26 is cut out and displayed.
- the clutch 202 is rotated clockwise by the urging force of the compressed return spring 204, and the pawl 43 and the ratchet gear 26 are engaged. Is released.
- the ball sensor 205C returns to the initial state when the acceleration of the vehicle is lost.
- the guide block 202G is a swing restricting member that prevents the vehicle sensor lever 205A from being lifted by the acceleration of the vehicle body when the locked state is released and the clutch 202 rotates clockwise to return to the normal position.
- the tip of the pilot arm 203 and the vehicle sensor lever 205A of the vehicle sensor 205 are in contact with each other so that the return of the clutch 202 is not restricted.
- the lower end of the wide area of the guide block 202G is in contact with the lever base 205B of the vehicle sensor 205.
- the clutch 202 rotates clockwise. Also when returning, the vehicle sensor lever 205A and the tip of the pilot arm 203 do not come into contact with each other.
- the lower end portion of the guide block 202G that comes into contact with the lever base portion 205B has a taper structure and the width is gradually reduced.
- the tip of the pilot arm 203 comes into contact with the vehicle sensor lever 205A to restrict the return operation of the clutch 202.
- the lever base 205B does not contact the guide block 202G, and the swing of the vehicle sensor 205 due to the acceleration of the vehicle body is not restricted by the guide block 202G.
- 29, 33, and 34 show a part of the pipe cylinder 62 as a cross-sectional view and clearly show the position of the piston 64 disposed inside. Further, as an indication excluding the base plate 65 and the pawl guide 77, the engaged state between the clutch pawl 29 and the guide drum 21 is clearly shown. 30, 35, and 36 show an enlarged state of engagement between the clutch pawl 29 and the guide drum 21.
- FIG. 31 shows the rotational position of the ratchet gear 26 when the pretensioner mechanism 17 is not operating, with the lock unit 9 removed from the side wall portion 12 of the housing 11.
- FIG. 32 shows the rotational position of the take-up drum unit 6 with a part cut away when the pretensioner mechanism 17 is not operating.
- FIG. 37 shows the rotational position of the ratchet gear 26 when the pretensioner mechanism 17 is operated and the mechanism cover 210 is plastically deformed, with the lock unit 9 removed from the side wall 12 of the housing 11.
- FIG. 38 shows a partially cutaway rotational position of the winding drum unit 6 when the pretensioner mechanism 17 is activated and the mechanism cover 210 is plastically deformed. 32 and 38, the wire 24 and the wire plate 25 are omitted, and a part of the flange portion 27 of the winding drum unit 6 is notched, and the mounting boss 31 and the bearing 32 are pivotally supported by the pinion gear body 33. It shows the state.
- one end side (the right end side in FIG. 32) of the take-up drum unit 6 is connected to the pretensioner unit via a bearing 32 fitted on the outer periphery of the mounting boss 31. 7 is rotatably supported by a bearing portion 33A of a pinion gear body 33 formed of a steel material or the like constituting the member 7. Further, on the other end side of the winding drum unit 6 (the left end side in FIG. 32), the shaft portion 48 of the ratchet gear 26 can rotate to the support boss 210B of the mechanism cover 210 via the fixed boss 206E of the lock gear 206. It is supported by.
- a predetermined gap (for example, a gap of about 0.3 mm to 0.5 mm) is provided between the ratchet gear portion 45 of the ratchet gear 26 and the inner peripheral edge portion of the through hole 137 formed in the side wall portion 12 of the housing 11. Is formed). That is, a predetermined gap (for example, a gap of about 0.3 mm to 0.5 mm) is provided between the ratchet gear portion 45 of the ratchet gear 26 and each internal tooth 88 formed on the engagement gear portion 89. Is formed. Therefore, the ratchet gear 26 does not contact the inner teeth 88, and the winding drum unit 6 rotates smoothly in the drawing direction of the webbing 3 or in the winding direction.
- FIGS. 33 to 38 a state where the pretensioner mechanism 17 is operated will be described with reference to FIGS. 33 to 38.
- the piston 64 in the pipe cylinder 62 is removed from the normal state shown in FIG.
- the pin 108 is sheared and moved upward (in the direction of the arrow X2) and comes into contact with the teeth of the pinion gear portion 71 of the pinion gear body 33.
- the pinion gear body 33 rotatably supported by the base plate 65 and the cover plate 57 starts to rotate counterclockwise (in the direction of the arrow X3) when viewed from the front.
- the pawl base 76 integrally fixed to the pinion gear body 33 starts to rotate, and the clutch pawl 29 starts to protrude outward in the radial direction.
- each positioning protrusion 77A of the pawl guide 77 is sheared from the outer surface of the pawl guide 77 by the rotation of the pawl base 76, and the clutch mechanism 68 and the pinion gear body 33 are integrated with the movement of the piston 64. And start rotating.
- FIG. 34 the engagement between the clutch pawl 29 and the guide drum 21 is completed, and the winding drum unit 6 is rotated in the winding direction of the webbing 3 (in the direction of arrow X4). Is wound around the guide drum 21 and drawn into the seat belt retractor 1 (in the direction of the arrow X5).
- the mounting boss 31 is rotatably supported by a metal pinion gear body 33, a base plate 65, and a cover plate 57 via a bearing 32.
- the shaft portion 48 is rotatably supported by a synthetic resin mechanism cover 210 fixed to the side wall portion 12 of the metal housing 11 via a synthetic resin locking gear 206.
- the mechanism cover 210 made of synthetic resin is configured to be plastically deformed when a pressing force of a predetermined value or more (for example, about 1 kN or more) acts on the outer side in the radial direction of the support boss 210B.
- a tension P1 for example, a tension of about 2 kN to 3 kN
- the support boss 210B is interposed via the shaft portion 48 and the locking gear 206.
- a pressing force of a predetermined value or more acts on the upper side in the radial direction, and the mechanism cover 210 is plastically deformed in the upper direction on which the tension P1 acts. Due to the plastic deformation of the mechanism cover 210, the rotational axis 48B of the shaft portion 48 is eccentric by the distance L1, and the ratchet gear portion 45 of the ratchet gear 26 is engaged with the engagement gear portion 89 formed on the metal side wall portion 12. The plurality of inner teeth 88 are pressed against each other and rotate.
- a frictional force is generated between the ratchet gear portion 45 of the ratchet gear 26 and the respective internal teeth 88 of the engagement gear portion 89, and is directed substantially inward in the radial direction with respect to the guide drum 21 (in FIG.
- the pressing force P2 (for example, about 0.4 kN to 0.6 kN) acts.
- the pressing force P ⁇ b> 2 is supported by the shaft portions 48 and the mounting bosses 31 at both ends in the axial direction of the winding drum unit 6.
- the resultant force P3 between the tension P1 (for example, a tension of about 2 kN to 3 kN) and the pressing force P2 (for example, about 0.4 kN to 0.6 kN) is the shaft portion 48 and the mounting boss 31.
- the rotation direction when the webbing 3 of the winding drum unit 6 is pulled out (the direction opposite to the arrow X4 direction). It acts on the outer side in the inclined radial direction (the upper left direction in FIG. 37).
- the ratchet gear 26 and the wire plate 25 of the winding drum unit 6 are prevented from rotating in the pulling-out direction of the webbing 3, and the winding direction of the webbing 3 of the winding drum unit 6 (arrow X4 in FIG. 37). Direction)). Then, the winding drum unit 6 is rotated in the winding direction of the webbing 3 until the movement of the piston 64 is stopped, and the webbing 3 is pulled in a predetermined length.
- the pretensioner mechanism 17 is activated, and the ratchet gear portion 45 of the ratchet gear 26 is connected to the plurality of internal teeth 88 of the engagement gear portion 89 formed on the metal side wall portion 12.
- the ratchet gear 26 is prevented from rotating in the pull-out direction of the webbing 3.
- the pulling force acting on the webbing 3 is pulled out beyond a predetermined value set in advance, it is inserted into each through hole 47 of the ratchet gear 26 by the rotational torque acting on the guide drum 21.
- Each crimped pin 37 is rotated with the guide drum 21 and sheared. At this time, the impact energy is absorbed by the shearing of each of the protruding pins 37 as the “first energy absorbing mechanism”.
- FIGS. 18 and 39 to 42 are explanatory views of the operation of pulling out the wire 24.
- FIG. 18 in the initial state of the wire plate 25 and the guide drum 21, one end side in the circumferential direction of the convex portion 141 constituting the curved path 145 is the drawing side end of the convex portion 38 constituting the curved path 156.
- the end portions of the bent paths 145 and 156 are opposed to each other so as to be substantially straight.
- FIG. 43 is an absorption characteristic diagram showing an example of absorption of impact energy by each of the protruding pins 37, the wires 24, and the torsion bar 23.
- the impact energy absorbed by the torsional deformation of the torsion bar 23 and the impact energy by the wire 24 are absorbed. Is absorbed at the same time.
- the energy absorption load is as much as possible along a predetermined load smaller than the maximum load F1 that does not adversely affect the occupant. Can be set.
- the wire 24 is fixed and held by the ribs 151 and 152, so that the structure can be simplified and the assembly work of the wire 24 can be made more efficient. it can.
- the impact energy is absorbed at the time of a vehicle collision or the like by absorbing the energy absorption in the initial stage immediately after the start of the absorption of the impact energy by each of the protruding pins 37 and the torsion bar 23, and thereafter by the wire 24 and the torsion bar 23. In this way, it can be made larger and more efficient.
- the mechanism cover 210 receives a pressing force of a predetermined value or more (for example, about 1 kN or more) to the upper side in the radial direction of the support boss 210B via the shaft portion 48 and the locking gear 206, and the tension P1 is increased. It is plastically deformed in the upward direction where it acts.
- a frictional force is generated between the ratchet gear portion 45 of the ratchet gear 26 and the respective internal teeth 88 of the engagement gear portion 89, and substantially inward in the radial direction with respect to the guide drum 21.
- a pressing force P2 (for example, about 0.4 kN to 0.6 kN) acts (which is substantially leftward in FIG. 37).
- the resultant force P3 of the tension P1 and the pressing force P2 is greater than the radial direction parallel to the pulling-out direction of the webbing 3 with respect to the rotation axis 48B of the shaft portion 48 and the mounting boss 31. 3 acts on the outside in the radial direction (in FIG. 37, the upper left direction).
- the mechanism cover 210 includes the shaft portion 48 and the locking gear. Through 206, it is further plastically deformed in the direction in which the resultant force P3 acts. Then, by the plastic deformation of the mechanism cover 210, the ratchet gear portion 45 of the ratchet gear 26 is locked in an engaged state in which the plurality of internal teeth 88 of the engagement gear portion 89 formed on the metal side wall portion 12 are engaged. Is done.
- the mechanism cover 210 attached to the outside of the side wall portion 12 of the housing 11 and rotatably supporting the shaft portion 48 has a tension P1 in the pull-out side direction of the webbing 3 of a predetermined value or more (for example, about 2 kN to 3 kN).
- a tension P1 in the pull-out side direction of the webbing 3 of a predetermined value or more (for example, about 2 kN to 3 kN).
- the state in which the rotation of the webbing 3 of the winding drum unit 6 in the pull-out direction is locked can be reliably maintained. Further, the winding drum unit 6 can be allowed to rotate in the winding direction of the webbing 3, and the winding drum unit 6 is rotated in the winding direction by the operation of the pretensioner mechanism 17 so that the webbing 3 is reliably wound. Can do.
- a plurality of internal teeth 88 that engage with the ratchet gear 26 of the winding drum unit 6 are provided on the inner peripheral edge of the through hole 137 formed in the side wall 12 of the housing 11, and the outer side of the side wall 12 of the housing 11 is provided.
- the pitch of the plurality of internal teeth 88 provided on the inner peripheral edge of the through hole 137 formed in the side wall 12 of the housing 11 is formed to be about 1 ⁇ 2 of the pitch of the ratchet gear 45 of the ratchet gear 26. Therefore, when the winding drum unit 6 rotates in the pull-out direction of the webbing 3, the delay time in which the ratchet gear portion 45 of the ratchet gear 26 engages with the plurality of internal teeth 88 can be reliably shortened. Further, since the plurality of internal teeth 88 are formed at a pitch that is about 1 ⁇ 2 of the pitch of the ratchet gear portion 45 of the ratchet gear 26, the radial height of the plurality of internal teeth 88 is lowered by burring or the like. Thus, the tooth thickness can be increased.
- the plurality of internal teeth 88 are formed on the shaft 48 and the rotation axis 48B of the mounting boss 31 among the inner peripheral edge of the through hole 137 formed in the side wall 12 that faces the ratchet gear portion 45 of the ratchet gear 26. On the other hand, it is formed on the inner peripheral edge at a central angle of about 90 degrees from at least the radial direction of the webbing 3 on the drawing side to the rotation direction side of the winding drum unit 6 when the webbing 3 is drawn. As a result, a plurality of internal teeth 88 can be reliably provided on the inner peripheral edge of the through hole 137 facing the moving direction of the ratchet gear 26 by plastic deformation of the mechanism cover 210 by the operation of the pretensioner mechanism 17. .
- the mechanism cover 210 is formed by molding a synthetic resin.
- a tension P1 of a predetermined value or more for example, about 2 kN to 3 kN
- the shape and strength of the mechanism cover 210 can be easily set so that the ratchet gear portion 45 is locked in the engaged state in which the ratchet gear portion 45 is engaged with the plurality of internal teeth 88.
- the seatbelt retractor 301 according to another embodiment 1 has substantially the same configuration as the seatbelt retractor 1, but the engagement gear shown in FIG.
- the unit 303 may be provided.
- the engaging gear portion 303 will be described with reference to FIG.
- FIG. 44 shows the rotational position of the ratchet gear 26 when the pretensioner mechanism 17 is not operating, with the lock unit 9 removed from the side wall portion 12 of the housing 11.
- FIG. 44 the same reference numerals as the configuration of the seat belt retractor 1 according to the embodiment in FIGS. 1 to 43 are the same as or equivalent to the configuration of the seat belt retractor 1 according to the embodiment. Is shown.
- an engagement gear portion 305 having a plurality of internal teeth 303 that can be engaged with the ratchet gear 26 is formed on the inner peripheral edge portion of the through-hole 137 facing the ratchet gear portion 45 of the ratchet gear 26.
- the plurality of internal teeth 303 are formed at the same pitch as the pitch of the ratchet gear portion 45 of the ratchet gear 26 and are formed so as to be inclined in the rotational direction in which the webbing 3 of the winding drum unit 6 is wound.
- the ratchet gear 26 is formed to engage with the ratchet gear portion 45 only when the ratchet gear 26 rotates in the pull-out direction of the webbing 3.
- the engagement gear portion 305 formed with the plurality of internal teeth 303 has a webbing 3 with respect to the rotation axis 48B of the shaft portion 48 standing on the ratchet gear 26 among the inner peripheral edge portion of the through hole 137. From the radial direction parallel to the pulling direction (upward direction in FIG. 44) to the rotation direction side of the take-up drum unit 6 when the webbing 3 is pulled out. ing.
- the engagement gear portion 305 having a plurality of inner teeth 303 is formed on the webbing 3 with respect to the rotation axis 48B of the shaft portion 48 standing on the ratchet gear 26 in the inner peripheral edge portion of the through hole 137. Is provided at the inner peripheral edge at a central angle of about 180 degrees on the drawing direction side (upward in FIG. 44) of the webbing 3 from the diameter perpendicular to the drawing direction (upward direction in FIG. 44). You may do it. Thereby, when the pretensioner mechanism 17 operates, the ratchet gear portion 45 of the ratchet gear 26 can be reliably engaged with the plurality of internal teeth 303.
- the pitch of the plurality of internal teeth 303 of the engagement gear portion 305 provided at the inner peripheral edge of the through hole 137 is formed to be the same as the pitch of the ratchet gear portion 45 of the ratchet gear 26.
- the ratchet gear 26 is quickly and reliably engaged with each internal tooth 303. can do.
- the pitch of the plurality of internal teeth 303 of the engagement gear portion 305 is formed to be the same as the pitch of the ratchet gear portion 45 of the ratchet gear 26, the strength of each internal tooth 303 can be increased.
- each internal tooth 88 of the engagement gear portion 89 formed on the side wall portion 12 of the housing 11 is changed to the thickness of the side wall portion 12 by burring or the like. You may form so that it may become thicker than T1. Thereby, the intensity
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- Automotive Seat Belt Assembly (AREA)
Abstract
Description
例えば、車両衝突時において、プリテンショナ機構のガス発生部材が作動した場合には、パイプシリンダ内のピストンが、通常状態から上方に移動して、ピニオンギヤ体を回動させる。このため、ピニオンギヤ体のピニオンギヤ部の歯が、ベースブロック体内に配設されたプッシュブロックに当接して外側方向へ押し出すため、プッシュブロックはブロック付勢バネによって更に押し出されて回転レバーを回動させ、該回転レバーの下端部がギヤ側アームの先端部から外れる。それにより、ギヤ側アームが付勢バネによって外側方向に回動され、連結シャフトを介してメカ側アームが回動してパウルを巻取ドラムユニットのラチェットギヤに係合した係合状態にロックする強制ロック機構を備えたシートベルト用リトラクタがある(例えば、特開2009-241863号公報参照。)。
先ず、本実施形態に係るシートベルト用リトラクタ1の概略構成について図1及び図2に基づき説明する。
図1は本実施形態に係るシートベルト用リトラクタ1の外観斜視図である。図2はシートベルト用リトラクタ1をユニット別に分解した斜視図である。
また、ロックユニット9は、後述のようにハウジングユニット5を構成するハウジング11の側壁部12に固設され、ウエビング3の急激な引き出しや車両の急激な加速度の変化に反応してウエビング3の引き出しを停止する起動動作を行う。
そして、ウエビング3が巻装される巻取ドラムユニット6は、ハウジングユニット5の側壁部12に固設されたロックユニット9とプリテンショナユニット7との間に回転自在に支持される。
次に、巻取ドラムユニット6の概略構成について図2乃至図5に基づいて説明する。
図3は巻取ドラムユニット6の斜視図である。図4はシートベルト用リトラクタ1の断面図である。図5は巻取ドラムユニット6、プリテンショナユニット7及び巻取バネユニット8の分解斜視図である。
また、フランジ部35の外周部は、アルミ材等により形成されて、内側面の外周部に該フランジ部35から外側に突出するワイヤ24が嵌め込まれる凸部38が形成された側面視略卵形のワイヤプレート25で覆われている。
次に、巻取バネユニット8の概略構成について図2、図4及び図5に基づいて説明する。
図2、図4及び図5に示すように、巻取バネユニット8は、渦巻バネを含む巻取付勢機構55と、この巻取付勢機構55を収容するバネケース56と、バネシャフト58と、から構成されている。そして、スチール材等で形成されるプリテンショナユニット7の外側面を構成するカバープレート57の各貫通孔51に、バネケース56の3箇所に設けられた各ナイラッチ8Aを介して固定される。そして、巻取ドラムユニット6のドラムシャフト22の先端部が、バネケース56内のバネシャフト58を介して渦巻バネに結合され、渦巻バネの付勢力によって巻取ドラムユニット6をウエビング3の巻取方向に常時付勢する構造とされている。
次に、プリテンショナユニット7の概略構成について図4乃至図8に基づいて説明する。
図6はプリテンショナユニット7をハウジングユニット5への取り付け面側から見た斜視図である。図7はプリテンショナユニット7の一部切り欠き側面図である。図8は図6のプリテンショナユニット7を分解した分解斜視図である。
図5乃至図8に示すように、パイプシリンダ62は、スチールパイプ材等で略L字状に形成されている。そして、その一端側(図7中、下側折曲部分)は、略円筒状の収納部62Aが形成されて、ガス発生部材61を収納するように構成されている。このガス発生部材61は、火薬を含んでおり、図示省略の制御部からの着火信号により該火薬を着火させてガス発生剤の燃焼でガスを発生させるように構成されている。
次に、ハウジングユニット5の概略構成について図9及び図10に基づいて説明する。
図9はハウジングユニット5の分解斜視図である。図10はシートベルト用リトラクタ1のロックユニット9を取り除いた状態の側面図である。
図9及び図10に示すように、ハウジングユニット5は、ハウジング11と、ブラケット133と、プロテクタ135と、パウル43と、パウルリベット136とから構成されている。
次に、プリテンショナ機構17を構成するクラッチ機構68について、機構の構成・構造について図11乃至図16に基づいて説明する。
図11は、シートベルト用リトラクタ1を、プリテンショナユニット7を挟んで、巻取りドラムユニット6と巻取バネユニット8とが連結された構成を示す部分断面図で、図4の断面図を背面側から見た図である。
図15及び図16は、クラッチ機構68の構成を示す分解斜視図である。図15は、巻取バネユニット8側から見た分解斜視図であり、図16は、巻取りドラムユニット6側から見た分解斜視図である。
次に、後述のように、プリテンショナ機構17が作動して、巻取ドラムユニット6のラチェットギヤ26が、ハウジング11の側壁部12に設けられた係合ギヤ部89の複数の内歯88に係合した係合状態にロックされた後、つまり、巻取ドラムユニット6がウエビング3の引き出し方向へ回転しないように強制ロックされた後、ウエビング3に作用する引出力が予め設定された所定値を超えた場合には、ウエビング3を所定荷重下で引き出させることによって乗員に生じる衝撃エネルギーを吸収するエネルギ吸収機構として、ワイヤ24及びトーションバー23等が巻取ドラムユニット6に設けられている。
図17は巻取ドラムユニット6の軸心及びカシメピン39を含む断面図である。図18は図17のX1-X1矢視断面図である。図19はドラムガイド21をワイヤプレート25の取り付け側から見た斜視図である。図20はドラムガイド21の段差部36に形成された屈曲路を示す一部拡大図である。図21はワイヤプレート25の屈曲路を示す一部拡大図である。
この屈曲路145は、図19に示すように、フランジ部35の軸方向外側面から突出する正面視下側向きの略台形状に形成された凸部147と、段差部36の外周の凸部147に対向する凹み部148と、この凹み部148の正面視左端(図20中、左端)から少し離れた段差部36の外周面から斜め内側方向に形成された溝部149と、段差部36の凹み部148と溝部149との間の外周面とによって形成されている。
本実施形態に係るシートベルト用リトラクタ1では、車両衝突時にプリテンショナ機構17が作動して巻取ドラムユニット6がウエビング3の引き出し方向へ回転しないようにロックする強制ロック機構のほかに、ロックユニット9が作動して巻取ドラムユニット6の回転をロックする2種類のロック機構を備えている。ウエビングの急な引き出しに対して作動するウエビング感応式ロック機構と、車両の揺れや傾きなどに起因して生ずる加速度に感応して作動する車体感応式ロック機構である。以下の説明では、プリテンショナ機構17が作動してロックする強制ロック機構と明確に区別するために、ロックユニット9が作動して巻取ドラムユニット6の回転をロックする2種類のロック機構を「緊急ロック機構」と称して、以下に説明を行う。
緊急ロック機構を構成するロックユニット9の概略構成について図4及び図22に基づいて説明する。図22は、緊急ロック機構を構成するロックユニット9の分解斜視図である。また、図4には断面図を示す。
図23乃至図25は、ウエビング感応式ロック機構の動作説明図である。ウエビング感応式ロック機構では、パウル43とラチェットギヤ26との関係を示す部分に加えて、ロックアーム208とクラッチ歯202Dとの関係を示す部分、及びセンサスプリング207の部分を切り欠いて表示している。
図26乃至図28は、車体感応式ロック機構の動作説明図である。車体感応式ロック機構では、パウル43とラチェットギヤ26との関係を示す部分を切り欠いて表示している。
次に、上記のように構成されたシートベルト用リトラクタ1において、車両衝突時等に、プリテンショナ機構17のガス発生部材61の作動によって起動する強制ロック機構の動作について図29乃至図38に基づいて説明する。
図29及び図30に示すように、パイプシリンダ62内のピストン64は、基底位置に配置されており、ピストン64に刻設されているラック116は、ピニオンギヤ体33とは係合していない。また、各クラッチパウル29は収納位置に維持されている。
図33と図35に示すように、車両衝突時等において、プリテンショナ機構17のガス発生部材61が作動した場合には、パイプシリンダ62内のピストン64が図29に示す通常状態から、ラック止めピン108を剪断して上方に(矢印X2方向である。)に移動し、ピニオンギヤ体33のピニオンギヤ部71の歯に当接する。
次に、車両衝突時等において、プリテンショナ機構17が作動して、ラチェットギヤ26のラチェットギヤ部45が、金属製の側壁部12に形成された係合ギヤ部89の複数の内歯88に係合した係合状態にロックされた場合には、ラチェットギヤ26のウエビング3の引き出し方向への回転が阻止される。この状態で、ウエビング3に作用する引出力が予め設定された所定値を超えて引き出された場合には、ガイドドラム21に作用する回転トルクによって、ラチェットギヤ26の各貫通孔47に嵌入されてカシメられた各突き出しピン37が、ガイドドラム21と共に回転されて、剪断される。この際に、「第1のエネルギ吸収機構」としての各突き出しピン37の剪断による衝撃エネルギの吸収がなされる。
ここで、ワイヤ24によって衝撃エネルギを吸収する際の、当該ワイヤ24の動作について図18、図39乃至図42に基づいて説明する。図39乃至図42はワイヤ24を引き出す動作説明図である。
図18に示されるように、ワイヤプレート25とガイドドラム21との初期状態においては、屈曲路145を構成する凸部141の周方向一端側が、屈曲路156を構成する凸部38の引き出し側端部の近くに位置し、各屈曲路145、156の各端部がほぼ一直線状になるように対向している。
また、車両衝突時等における衝撃エネルギの吸収は、この衝撃エネルギの吸収開始直後の初期段階におけるエネルギ吸収を各突き出しピン37及びトーションバー23によって吸収し、その後、ワイヤ24及びトーションバー23によって吸収するようにして大きくし、より効率よく行うことが可能となる。
(A)例えば、他の実施形態1に係るシートベルト用リトラクタ301では、上記シートベルト用リトラクタ1とほぼ同じ構成であるが、上記係合ギヤ部89に替えて、図44に示す係合ギヤ部303を設けるようにしてもよい。ここで係合ギヤ部303について図44に基づいて説明する。
(B)また例えば、図45に示すように、ハウジング11の側壁部12に形成された係合ギヤ部89の各内歯88の厚さT2を、バーリング加工等によって、側壁部12の厚さT1よりも厚くなるように形成してもよい。これにより、各内歯88の強度を上げることができる。
Claims (4)
- ハウジングと、
前記ハウジングに回転可能に収納されてウエビングを巻回収納する巻取ドラムと、
前記ハウジングの一方の側壁部の外側に取り付けられて車両衝突時に前記巻取ドラムを巻き取り方向に回転させて前記ウエビングを巻き取るプリテンショナ機構部と、
を備えたシートベルト用リトラクタにおいて、
前記巻取ドラムは、軸方向の一端側が前記ハウジングの一方の側壁部に回転自在に軸支されると共に、軸方向他端側に立設された軸部が前記ハウジングの一方の側壁部に対向する他方の側壁部の外側に取り付けられたカバー部材を介して回転自在に軸支され、
前記ハウジングは、
前記他方の側壁部に形成されて前記巻取ドラムの軸方向他端側の端縁部外周に形成されたラチェットギヤが所定隙間を形成して挿通される開口部と、
前記開口部の前記ラチェットギヤに対向する内側周縁部に形成されて該ラチェットギヤに係合可能な複数の内歯と、
を有し、
前記カバー部材は、前記プリテンショナ機構部が作動して前記ウエビングに所定値以上の張力が作用した場合に、前記軸部を介して塑性変形されて、前記ラチェットギヤを前記複数の内歯に係合した係合状態にロックすることを特徴とするシートベルト用リトラクタ。 - 前記複数の内歯は、前記ラチェットギヤのピッチよりも小さいピッチに形成されていることを特徴とする請求項1に記載のシートベルト用リトラクタ。
- 前記複数の内歯は、前記開口部の前記ラチェットギヤに対向する内側周縁部のうち、前記巻取ドラムの回転軸心に対して、少なくとも前記ウエビングの引き出し側の半径方向から該ウエビングの引き出し時の該巻取ドラムの回転方向側の内側周縁部に形成されていることを特徴とする請求項1または請求項2に記載のシートベルト用リトラクタ。
- 前記カバー部材は、合成樹脂の成形によって形成されていることを特徴とする請求項1乃至請求項3のいずれかに記載のシートベルト用リトラクタ。
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CN201180065382.0A CN103492238B (zh) | 2011-01-20 | 2011-12-12 | 安全带卷收器 |
KR1020137020557A KR101445679B1 (ko) | 2011-01-20 | 2011-12-12 | 시트 벨트용 리트랙터 |
EP11856387.3A EP2666680B1 (en) | 2011-01-20 | 2011-12-12 | Seat belt retractor |
US13/991,498 US9132803B2 (en) | 2011-01-20 | 2011-12-12 | Seatbelt retractor |
JP2012553576A JP5778697B2 (ja) | 2011-01-20 | 2011-12-12 | シートベルト用リトラクタ |
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US (1) | US9132803B2 (ja) |
EP (1) | EP2666680B1 (ja) |
JP (1) | JP5778697B2 (ja) |
KR (1) | KR101445679B1 (ja) |
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US20160375858A1 (en) * | 2015-06-26 | 2016-12-29 | Jeffery L. Biegun | Passenger restraint housing for vehicle |
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JP6010477B2 (ja) * | 2013-02-08 | 2016-10-19 | 株式会社東海理化電機製作所 | プリテンショナ機構 |
CN107215303B (zh) * | 2016-03-21 | 2021-04-13 | 天合汽车科技(上海)有限公司 | 安全带卷收器、车辆安全带和车辆 |
KR101803755B1 (ko) * | 2016-05-25 | 2017-12-04 | 주식회사 우신세이프티시스템 | 모드전환레버를 포함하는 지능형 리트랙터 |
CN106696886A (zh) * | 2016-12-24 | 2017-05-24 | 江阴市达安汽车零部件有限公司 | 卷收器及其带有该卷收器的汽车安全带 |
CN110329205B (zh) * | 2019-07-17 | 2020-10-09 | 重庆光大产业有限公司 | 一种可对弯管全方位固定的卷收器 |
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- 2011-12-12 US US13/991,498 patent/US9132803B2/en not_active Expired - Fee Related
- 2011-12-12 KR KR1020137020557A patent/KR101445679B1/ko active IP Right Grant
- 2011-12-12 CN CN201180065382.0A patent/CN103492238B/zh active Active
- 2011-12-12 JP JP2012553576A patent/JP5778697B2/ja active Active
- 2011-12-12 EP EP11856387.3A patent/EP2666680B1/en active Active
- 2011-12-12 WO PCT/JP2011/078657 patent/WO2012098784A1/ja active Application Filing
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JPH0840201A (ja) * | 1994-07-29 | 1996-02-13 | Tokai Rika Co Ltd | リトラクタのロック構造 |
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US9744938B2 (en) * | 2015-06-26 | 2017-08-29 | Jeffery L. Biegun | Passenger restraint housing for vehicle |
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CN103492238B (zh) | 2016-03-23 |
JPWO2012098784A1 (ja) | 2014-06-09 |
EP2666680A1 (en) | 2013-11-27 |
US9132803B2 (en) | 2015-09-15 |
KR101445679B1 (ko) | 2014-10-01 |
KR20130103802A (ko) | 2013-09-24 |
EP2666680B1 (en) | 2015-12-09 |
US20130256444A1 (en) | 2013-10-03 |
CN103492238A (zh) | 2014-01-01 |
EP2666680A4 (en) | 2014-06-11 |
JP5778697B2 (ja) | 2015-09-16 |
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