JP2019137282A - Webbing winding device - Google Patents

Abstract

To make it possible to smoothly tilt a detection mechanism by a rotor.SOLUTION: In a webbing winding device, a rod 148 of a sector gear 142 penetrates a connection hole 58A of a sensor housing 58 of an acceleration sensor 56, and when a device body 18 is tilted and the sector gear 142 is rotated, the sensor housing 58 is tilted. Herein, the connection hole 58A is extended in a rotation radial direction of the sector gear 142. Therefore, when the sector gear 142 is rotated and the rod 148 is tilted to a rotation axial direction side of the sector gear 142, the sector gear 142 can smoothly tilt the sensor housing 58.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a webbing take-up device in which a rotating body is rotated and a detection mechanism is tilted.

  In the seat belt retractor described in Patent Document 1, the pin of the adjustment gear is connected to the slit of the sensor housing in the acceleration sensor, and the adjustment gear is rotated and the sensor housing is tilted by tilting the spindle. The

  Here, in this seat belt retractor, when the adjusting gear is rotated, the pin is not displaced in the rotating shaft direction of the adjusting gear.

JP2013-123994A

  In consideration of the above-described facts, the present invention provides a webbing winding that allows the rotating body to smoothly tilt the detection mechanism when the rotating body is rotated and the connecting portion of the rotating body is displaced toward the rotation axis direction of the rotating body. The purpose is to obtain a take-off device.

  A webbing take-up device according to a first aspect of the present invention is a spool in which a webbing to be worn by an occupant of a vehicle is taken up, the webbing is drawn out and rotated in the drawing direction, and a detection mechanism that detects acceleration of the vehicle. A limiting mechanism that restricts rotation of the spool in the pull-out direction in response to vehicle acceleration detected by the detection mechanism, a rotating body that is rotated when the spool is tilted, and a rotating body. A connecting portion that is rotated to be displaced toward the rotation axis direction of the rotating body, and the detecting mechanism is connected to the connecting portion, and the rotating body is rotated to detect the detecting mechanism. And a connected portion that is tilted and is allowed to displace the connecting portion toward the rotating body rotation axis in the connecting position of the connecting portion.

  The webbing take-up device according to a second aspect of the present invention is the webbing take-up device according to the first aspect of the present invention, wherein the tilt center axis of the detection mechanism and the rotation center axis of the rotating body are arranged on the same axis. .

  The webbing take-up device according to a third aspect of the present invention is the webbing take-up device according to the first aspect or the second aspect of the present invention, in which the connecting portion and the connected portion are relatively moved in the rotational diameter direction of the rotating body. Is acceptable.

  The webbing take-up device according to a fourth aspect of the present invention is the webbing take-up device according to any one of the first to third aspects of the present invention, wherein one of the connection part and the connected part is the connection part and the connection part. It penetrates the other of the connected parts.

  In the webbing take-up device according to the first aspect of the present invention, the webbing to be mounted on the vehicle occupant is wound around the spool, the webbing is drawn out from the spool, and the spool is rotated in the drawing-out direction. Further, the limit mechanism limits the rotation of the spool in the pull-out direction in accordance with the vehicle acceleration detected by the detection mechanism. Further, the connecting portion of the rotating body is connected to the connected portion of the detection mechanism, and the spool is tilted, whereby the rotating body is rotated and the detection mechanism is tilted.

  Here, the rotating body is rotated and the connecting portion is displaced toward the rotating shaft direction of the rotating body, and the connecting portion is allowed to be displaced toward the rotating body rotating axis in the connecting position of the connecting portion to the connected portion. Is done. For this reason, when the rotating body is rotated and the connecting portion is displaced toward the rotating shaft in the rotating body, the rotating body can smoothly tilt the detection mechanism.

  In the webbing take-up device according to the second aspect of the present invention, the tilt center axis of the detection mechanism and the rotation center axis of the rotating body are arranged on the same axis. For this reason, when the rotating body is rotated and the connecting portion is displaced to the rotating shaft direction side of the rotating body with the tilting center axis of the detecting mechanism and the rotating center axis of the rotating body being arranged on the same axis. The rotating body can tilt the detection mechanism smoothly.

  In the webbing take-up device according to the third aspect of the present invention, the relative movement of the connecting portion and the connected portion in the direction of the rotational diameter of the rotating body is allowed. For this reason, the accuracy of the tilting position of the detection mechanism with respect to the rotational position of the rotating body can be increased.

  In the webbing retractor according to the fourth aspect of the present invention, one of the connecting portion and the connected portion penetrates the other of the connecting portion and the connected portion. For this reason, it can suppress that the connection to the to-be-connected part of a connection part is cancelled | released.

It is a disassembled perspective view of the apparatus main body of the webbing take-up device according to the embodiment of the present invention. It is a side view of the sheet | seat with which the webbing winding device was applied. It is a side view of the apparatus main body of the webbing retractor showing a state before the seat back of the seat is tilted to the vehicle rear side. It is a side view of the apparatus main body of the webbing retractor showing a state in which the seat back of the seat is tilted to the vehicle rear side. It is the figure which looked at the gear case etc. from the apparatus right side. It is a perspective view of an acceleration sensor or the like. It is a front view of an acceleration sensor or the like.

  Next, an embodiment of the present invention will be described with reference to FIGS. In each figure, an arrow FR indicates the front side of the webbing retractor 10 according to the embodiment of the present invention, an arrow LH indicates the left side of the apparatus, and an arrow UP indicates the upper side of the apparatus.

<Configuration of the present embodiment>
As shown in FIG. 2, the webbing retractor 10 according to the present embodiment is provided on a seat back 14 of a vehicle seat 12. In the seat 12 to which the webbing retractor 10 is applied, the seat back 14 is located behind the vehicle with respect to the seat cushion 16 around the vehicle lower side of the seat back 14 (the direction opposite to the arrow Y in FIG. 2). The seat 12 is provided with a reclining mechanism that can tilt to the side (arrow Z1 direction side in FIG. 2) and the vehicle front side (arrow Z2 direction side in FIG. 2).

  As shown in FIG. 1, the webbing take-up device 10 includes a device main body 18. As shown in FIG. 2, the apparatus main body 18 is provided on the vehicle upper side (arrow Y direction side in FIG. 2) inside the seat back 14 of the seat 12. As shown in FIG. 1, the apparatus main body 18 includes a frame 20. The frame 20 is fixed to a skeleton or the like (not shown) of the seat back 14 shown in FIG.

  As shown in FIG. 1, the frame 20 includes leg plates 22 and 24. These leg plates 22 and 24 are opposed to each other in the left-right direction of the apparatus. An extending portion 22A is provided below the leg plate 22 on the right side of the device, and the extending portion 22A extends to the lower side of the device. The leg plate 22 is bent toward the device left side (the leg plate 24 side) at the device upper end of the extension portion 22A, and the extension portion 22A is inclined in the direction toward the device left side toward the device lower side. An insertion hole 22B is formed through the leg plate 22, and the insertion hole 22B extends in the vertical direction of the device and passes through the device upper end (bending portion) of the extending portion 22A.

  The frame 20 is provided with a spool 26. The center axis direction of the spool 26 is along the opposing direction of the leg plate 22 and the leg plate 24 (that is, the left-right direction of the device), and the spool 26 is rotatable around the center axis. The longitudinal base end portion of the long webbing 28 is locked to the spool 26, and when the spool 26 is rotated in the winding direction (the direction of arrow A in FIG. 1), the webbing 28 is It is wound on the spool 26 from the end side. The webbing 28 extends from the spool 26 to the upper side of the apparatus.

  Further, as shown in FIG. 2, the webbing 28 extending from the spool 26 to the upper side of the device is located on the vehicle upper side end (side end in the arrow Y direction in FIG. 2) of the seat back 14 in the vehicle width direction (the back of the page in FIG. 2). From the side) portion to the upper side of the seat back 14. Further, the webbing 28 that protrudes to the upper side of the seat back 14 extends to the front side of the vehicle (the end in the direction of the arrow X in FIG. 2) along the upper side end of the seat back 14, and further to the front side of the seat back 14 in the vehicle. Along the vehicle lower side (the opposite side to the arrow Y direction in FIG. 2).

  The front end of the webbing 28 in the longitudinal direction is locked to the anchor plate 30. The anchor plate 30 is fixed to the skeleton of the seat back 14 or the vehicle body of the vehicle. The webbing 28 is provided with a tongue 32. The tongue 32 is disposed in a portion of the webbing 28 that is provided on the front side of the seatback 14 and can move within a predetermined range along the webbing 28.

  The vehicle seat belt apparatus to which the webbing retractor 10 is applied includes a buckle 34. The buckle 34 is provided inside the seat 12 in the vehicle width direction. The webbing 28 is attached to the occupant's body by engaging the tongue 32 with the buckle 34 in a state where the webbing 28 is wound around the occupant's body seated on the seat 12.

  As shown in FIG. 1, a spring case 36 is provided on the left side of the leg plate 24 of the frame 20. A spiral spring as a spool urging means is accommodated inside the spring case 36. The spiral direction outer end of the spiral spring is locked to the spring case 36. On the other hand, the spiral direction inner end of the spiral spring is directly or indirectly locked to the end of the spool 26 on the leg plate 24 side (device left side). As a result, the spool 26 is biased in the winding direction (the direction of arrow A in FIG. 1).

  On the other hand, a lock base 38 is provided on the leg plate 22 side (right side of the apparatus) of the spool 26. The lock base 38 is disposed coaxially with the spool 26. Further, the device right side portion of the torsion bar 40 serving as an energy absorbing member constituting the force limiter mechanism is disposed in the center side in the radial direction of the lock base 38 so as to penetrate the device right side portion of the torsion bar 40 of the lock base 38. Relative rotation is limited.

  The torsion bar 40 has a bar shape, and the longitudinal direction of the torsion bar 40 is the left-right direction of the apparatus. The device left side portion of the torsion bar 40 is disposed inside the spool 26. The left side portion of the torsion bar 40 is connected to the spool 26, and the relative rotation of the left side portion of the torsion bar 40 with respect to the spool 26 is restricted. As a result, the relative rotation of the lock base 38 with respect to the spool 26 is limited, and the lock base 38 is rotated integrally with the spool 26.

  Around the lock base 38, a lock mechanism 41 as a limiting mechanism is provided. A ratchet hole 42 is formed in the leg plate 22 of the frame 20 corresponding to the lock base 38. The ratchet hole 42 is formed coaxially with the lock base 38, and the lock base 38 is disposed inside the ratchet hole 42. The lock base 38 is provided with a lock pawl 44. The lock pawl 44 is movable with respect to the lock base 38 in a lock direction (arrow C direction in FIG. 1) which is one of the radial directions of the lock base 38 and in the opposite direction.

  The lock pawl 44 is formed with lock teeth. When the lock pawl 44 is moved in the lock direction, the lock teeth of the lock pawl 44 mesh with the ratchet teeth of the ratchet hole 42. As described above, when the lock teeth of the lock pawl 44 are engaged with the ratchet teeth of the ratchet hole 42, the rotation of the lock base 38 in the pulling direction opposite to the winding direction (arrow B direction in FIG. 1) is restricted. (Locked).

  A sensor holder 46 is provided on the right side of the frame 20. The sensor holder 46 is formed in a bottomed shape that opens toward the left side of the apparatus, and the sensor holder 46 is fixed to the frame 20 so as to face the leg plate 22 of the frame 20. A V gear 48 is provided inside the sensor holder 46. The torsion bar 40 described above corresponding to the V gear 48 is provided with a shaft portion 50. The shaft portion 50 is provided coaxially with the spool 26, and the V gear 48 is rotatably supported by the shaft portion 50.

  The V gear 48 is provided with a spring (not shown). A part of the spring is engaged with the lock base 38. When the lock base 38 is rotated in the pull-out direction, the spring is pressed against the lock base 38 and presses the V gear 48 in the pull-out direction. As a result, the V gear 48 can follow the spool 26 and rotate in the pull-out direction. A part of the lock pawl 44 provided on the lock base 38 is engaged with the V gear 48. When the lock base 38 is rotated relative to the V gear 48 in the pull-out direction, the lock pawl 44 is locked. It is moved in the direction (arrow C direction in FIG. 1).

  A sensor cover 52 is provided on the opposite side of the sensor holder 46 from the leg plate 22. The sensor cover 52 has a bottomed shape that opens toward the leg plate 22, and is attached to the leg plate 22. A hanger 54 is disposed inside the sensor cover 52. The hanger 54 has a box shape, and is fixed to the leg plate 22 (including the extending portion 22A) of the frame 20. The hanger 54 is opened to the upper side of the apparatus, and an acceleration sensor 56 as a detection mechanism is provided inside the hanger 54.

  The acceleration sensor 56 includes a sensor housing 58. The sensor housing 58 includes a placement portion 60, and the placement portion 60 is disposed perpendicular to the vehicle vertical direction. Vertical walls 62 are formed at both ends of the mounting unit 60 in the left-right direction of the apparatus. The vertical wall 62 extends from the both ends of the mounting portion 60 in the left-right direction of the apparatus to the upper side of the apparatus. Housing pins 64 are provided on the upper end portions of the vertical walls 62. The center axis direction of these housing pins 64 is the vehicle width direction and is perpendicular to the extending portion 22A of the leg plate 22, and both the housing pins 64 are coaxially arranged.

  The housing pin 64 of the vertical wall 62 on the right side of the apparatus protrudes from the vertical wall 62 to the right side of the apparatus, and the housing pin 64 of the vertical wall 62 on the left side of the apparatus protrudes from the vertical wall 62 to the left side of the apparatus. Yes. These housing pins 64 are rotatably supported by the hanger 54. As a result, the sensor housing 58 of the acceleration sensor 56 can be tilted relative to the hanger 54 around the housing pin 64. The vertical wall 62 on the left side of the apparatus is formed with a substantially elliptical connection hole 58A as a connected portion, and the connection hole 58A extends in the tilting radial direction of the sensor housing 58 (the radial direction of the housing pin 64). Has been.

  A sensor ball 66 as an inertia mass body is provided on the mounting portion 60 of the sensor housing 58. Further, a sensor lever 68 is provided on the upper side of the sensor ball 66. The sensor lever 68 is supported by a sensor housing 58, and the sensor lever 68 can be rotated in the vertical direction of the apparatus around a support position by the sensor housing 58. When the sensor ball 66 rolls to the front side of the vehicle on the mounting portion 60, the sensor lever 68 is pushed by the sensor ball 66 and rotated to the upper side of the device (the upper side of the vehicle). A V pawl 70 is provided on the upper side of the sensor lever 68.

  The V pawl 70 is rotatably supported by the sensor holder 46. Further, the V pawl 70 includes a lever portion 70A (see FIG. 3). The lever portion 70 </ b> A is formed to extend outward in the rotational radial direction of the V pawl 70. When the sensor lever 68 is rotated upward, the V pawl 70 is pressed by the sensor lever 68, the lever portion 70A is rotated upward, and the tip of the lever portion 70A is engaged with the V gear 48. The This restricts the rotation of the V gear 48 in the pull-out direction.

  On the other hand, a gear case 72 as a support member is provided on the left side of the leg plate 22 of the frame 20. The gear case 72 includes a pulley arrangement portion 74. The pulley arrangement portion 74 is formed in a substantially cylindrical shape with the left end of the apparatus closed, and the axial direction of the pulley arrangement portion 74 is arranged in parallel with the axial direction of the housing pin 64 of the acceleration sensor 56. A spring support portion 76 is provided inside the pulley arrangement portion 74. The spring support portion 76 has a substantially cylindrical shape and is provided coaxially with the pulley arrangement portion 74. The spring support portion 76 is provided with a return spring 78.

  The return spring 78 is a torsion coil spring, and the return spring 78 is supported by the spring support portion 76 in a state where the spring support portion 76 is inserted inside the coiled portion 78A of the return spring 78. One end of the return spring 78 on the left side of the device extends in the tangential direction of the coiled portion 78 </ b> A, and one end of the return spring 78 is held on the device left side wall of the pulley arrangement portion 74. . The other end of the return spring 78 on the right side of the device extends in the tangential direction of the coiled portion 78A, and the other end of the return spring 78 is wound with the coiled portion 78A, and the spring support portion. It is urged in the return direction (the direction of arrow D in FIG. 1 and the like) which is one of the directions around the axis centering on 76. A bent portion 78B is formed at the other side end of the return spring 78, and the bent portion 78B is bent perpendicularly to the one side portion from the bent portion 78B of the return spring 78 to form a coil-shaped portion. It extends outward in the radial direction of 78A.

  A pulley support shaft 80 is provided coaxially with the spring support portion 76 at the right end of the spring support portion 76, and a pulley 82 as an interference member rotates around the pulley support shaft 80. It is supported to move (rotate) freely. A protrusion 82A (see FIG. 5) is formed on the left side of the pulley 82, and the protrusion 82A protrudes radially inward of the pulley 82 and the protruding tip surface is curved in a convex shape. . The projecting tip surface of the projecting portion 82 </ b> A is in contact with a portion near the bent portion 78 </ b> B at the other end of the return spring 78, and the pulley 82 is urged in the return direction by the return spring 78. The convex portion 82A is separated from the bent portion 78B of the return spring 78 on the return direction side, and the convex portion 82A faces the bent portion 78B on the return direction side. The pulley 82 holds one side portion in the longitudinal direction of the cable 84 shown in FIG.

  The cable 84 includes a tube 86. The tube 86 is formed in a hollow long string shape. An engaging cylinder 88 is provided at one end portion in the longitudinal direction of the tube 86. The engagement cylinder 88 is a cylinder that is harder than the tube 86, and the longitudinal end portion of the tube 86 is inserted inside the engagement cylinder 88.

  The cable 84 includes a wire 94. The wire 94 has a long string shape. The middle portion of the wire 94 in the longitudinal direction is disposed inside the tube 86 (including the engagement tube 88), and both longitudinal end portions of the wire 94 extend from the both longitudinal ends of the tube 86 to the outside of the tube 86. Yes. The wire 94 is movable relative to the tube 86 in the longitudinal direction of the wire 94 and the tube 86.

  On the other hand, the end of one side of the wire 94 in the longitudinal direction is locked to the pulley 82 that holds the one side in the longitudinal direction of the cable 84 having such a configuration. A groove 110 is formed on the outer peripheral portion of the pulley 82. The groove 110 is opened to the outside in the radial direction of the pulley 82, and the wire 94 of the cable 84 enters the inside of the groove 110 and is wound around the pulley 82.

  As shown in FIG. 1, a cable holding portion 116 is formed at the lower rear side of the pulley arrangement portion 74 in the gear case 72. As shown in FIG. 5, the cable holding portion 116 has a cable 84. An engagement cylinder 88 is held. As a result, the wire 94 of the cable 84 is relatively moved in the longitudinal direction with respect to the tube 86 as the pulley 82 rotates. The other end portion in the longitudinal direction of the cable 84 from the engagement tube 88 extends to the lower side of the gear case 72, and the other end portion in the longitudinal direction of the cable 84 is connected to the interlock mechanism 114 as shown in FIG. ing.

  The interlocking mechanism 114 is operated in conjunction with the tilting of the seatback 14 about the vehicle lower side portion of the seatback 14 toward the vehicle rear side and the vehicle front side. For example, when the interlocking mechanism 114 is operated in conjunction with the tilting of the seat back 14 toward the vehicle rear side, the wire 94 of the cable 84 is pulled to the other side in the longitudinal direction of the cable 84 (that is, the interlocking mechanism 114 side), The wire 94 is moved to the other side in the longitudinal direction of the cable 84 with respect to the tube 86. As a result, the pulley 82 is rotated in the direction opposite to the return direction (the direction of arrow D in FIG. 5 and the like) against the urging force of the return spring 78.

  On the other hand, when the interlocking mechanism 114 is operated in conjunction with the tilting of the seat back 14 toward the front side of the vehicle, the wire 94 of the cable 84 is one side in the longitudinal direction of the cable 84 (that is, the side opposite to the interlocking mechanism 114). ) And the wire 94 is moved to the longitudinal side of the cable 84 with respect to the tube 86. As a result, the pulley 82 is rotated in the return direction (the direction of arrow D in FIG. 5 and the like) by the urging force of the return spring 78.

  On the other hand, a gear arrangement portion 130 is provided on the upper side of the pulley arrangement portion 74 in the gear case 72, and the gear arrangement portion 130 is arranged in parallel with the extending portion 22 </ b> A of the leg plate 22 of the frame 20. A gear support shaft 132 is provided on the right side of the gear placement unit 130, and the gear support shaft 132 is inserted into the device upper side of the insertion hole 22 </ b> B of the leg plate 22, and the device upper end of the extension 22 </ b> A ( (Bending portion) is arranged on the upper side of the apparatus. The axial direction of the gear support shaft 132 is disposed parallel to the vehicle width direction, and the gear support shaft 132 is disposed coaxially with the housing pin 64 of the sensor housing 58 of the acceleration sensor 56.

  The gear support shaft 132 is provided with a resin sector gear 142 as a rotating body. The sector gear 142 is generally fan-shaped as a whole, and a circular hole 144 is formed at the main position of the fan when the sector gear 142 is regarded as a fan shape. A gear support shaft 132 is disposed through the circular hole 144 of the sector gear 142, and the sector gear 142 is supported by the gear support shaft 132 so as to be rotatable (rotatable) around the gear support shaft 132. The portion of the sector gear 142 on the lower side of the device with respect to the circular hole 144 is opposed to the device upper end of the extending portion 22A of the leg plate 22 in the vehicle width direction (see FIG. 7). Are formed with external teeth 142A.

  The pulley 82 described above corresponding to the sector gear 142 is provided with a gear portion 146 on the right side of the apparatus (see FIG. 5). The gear portion 146 is a spur external gear, and is disposed coaxially with the pulley 82. The lower portion of the sector gear 142 is disposed on the right side of the pulley 82, and the outer teeth 142A of the sector gear 142 are engaged with the outer teeth of the gear portion 146, so that the pulley 82 is rotated. As a result, the sector gear 142 is rotated. A rod 148 as a connecting portion is provided on the outer side portion of the sector gear 142 in the rotational radial direction.

  The rod 148 has a substantially cylindrical shape, and the central axis direction of the rod 148 is the same direction as the central axis direction of the gear support shaft 132. The rod 148 extends from the right side surface of the sector gear 142. Corresponding to the rod 148, a first hole 150 is formed in the leg plate 22 of the frame 20, and a second hole 152 is formed in the vertical wall on the leg plate 22 side of the hanger 54. The rod 148 passes through the first hole 150 and the second hole 152 and is rotatable inside the hanger 54. Further, the tip of the rod 148 (the end opposite to the sector gear 142) is penetrated (connected) to the connection hole 58A of the sensor housing 58 of the acceleration sensor 56 (see FIG. 6), and the tip of the rod 148 Is fitted in the connection hole 58A in the rotation direction of the sector gear 142 (inclination direction of the sensor housing 58), and the extension direction of the connection hole 58A relative to the sensor housing 58 (in the rotation radial direction of the sector gear 142 and the sensor housing 58). In the tilting radial direction). Therefore, when the sector gear 142 is rotated, the sensor housing 58 is pressed in the rotating direction of the sector gear 142 by the rod 148, and thereby the sensor housing 58 is tilted about the housing pin 64.

<Operation and effect of the present embodiment>
Next, the operation and effect of the present embodiment will be described.

  In the webbing take-up device 10, the sensor ball 66 of the acceleration sensor 56 rolls on the mounting portion 60 of the sensor housing 58 when the vehicle suddenly decelerates during a vehicle collision or the like. As a result, the sensor lever 68 is rotated upward by the sensor ball 66. When the sensor lever 68 is thus rotated, the V pawl 70 is pressed upward by the sensor lever 68 and the V pawl 70 is rotated upward. As a result, the V pawl 70 is engaged with the V gear 48, and the rotation of the V gear 48 in the pull-out direction is limited.

  On the other hand, when the vehicle occupant is inertially moved to the front side of the vehicle due to the sudden deceleration of the vehicle, the webbing 28 attached to the occupant's body is pulled, thereby rotating the spool 26 in the pull-out direction, and further locking The base 38 is rotated together with the spool 26 in the drawing direction. Here, in this state, if the rotation of the V gear 48 in the pull-out direction is restricted as described above, the spool 26 is rotated relative to the V gear 48 in the pull-out direction.

  Thus, when the lock pawl 44 provided on the lock base 38 is moved in the lock direction (the direction of arrow C in FIG. 1), the lock teeth of the lock pawl 44 are moved to the ratchet teeth of the ratchet hole 42 of the leg plate 22 of the frame 20. Engaged. Thereby, the rotation of the lock base 38 in the pull-out direction is limited. As described above, the rotation of the lock base 38 in the pull-out direction is limited, whereby the rotation of the spool 26 in the pull-out direction is limited, and the pull-out of the webbing 28 from the spool 26 is limited. Thus, the occupant's body can be restrained by the webbing 28, and the inertial movement of the occupant toward the front side of the vehicle can be effectively suppressed.

  On the other hand, the webbing take-up device 10 is provided on the seat back 14 of the seat 12 with the reclining mechanism as described above. Here, in FIG. 3, the seat back 14 shown in FIG. 2 is located on the vehicle rear side (with respect to the seat cushion 16) with respect to the vehicle lower side of the seat back 14 (opposite to the arrow Y direction in FIG. 2). The state of the apparatus main body 18 of the webbing take-up device 10 before being tilted in the direction of the arrow Z1 in FIG. 2 is shown, and FIG. 4 shows the state in which the seat back 14 is tilted toward the vehicle rear side. Has been. As shown in these drawings, the frame 20 of the apparatus main body 18 of the webbing take-up device 10 is fixed to the skeleton of the seat back 14 or the like. For this reason, when the seat back 14 is tilted to the vehicle rear side, the apparatus main body 18 (including the spool 26 and the lock mechanism 41) is tilted to the vehicle rear side together with the seat back 14.

  Here, when the seat back 14 is tilted to the rear side of the vehicle, the interlock mechanism 114 of the webbing retractor 10 is operated in conjunction with the tilt of the seat back 14. As a result, the wire 94 of the cable 84 is pulled to the other side in the longitudinal direction of the cable 84 (that is, the interlocking mechanism 114 side), and the wire 94 is moved to the other side in the longitudinal direction of the cable 84 with respect to the tube 86. As a result, the pulley 82 is rotated in the direction opposite to the return direction (the direction of arrow D in FIG. 5 and the like) against the urging force of the return spring 78.

  The rotation of the pulley 82 is transmitted to the sector gear 142, whereby the sector gear 142 is rotated. When the sector gear 142 is thus rotated, the peripheral surface of the connection hole 58A of the sensor housing 58 of the acceleration sensor 56 is pressed by the rod 148 of the sector gear 142, and the sensor housing 58 is mounted on the housing body 64 around the housing pin 64. It is tilted with respect to the frame 20. Thereby, even if the apparatus main body 18 is tilted to the rear side of the vehicle, the tilt of the sensor housing 58 is suppressed, and the state in which the mounting portion 60 of the sensor housing 58 is arranged vertically in the vehicle vertical direction is maintained. Thus, even if the apparatus main body 18 is tilted to the rear side of the vehicle, the operation of the acceleration sensor 56 can be stabilized.

  By the way, when the pulley 82 is rotated in the direction opposite to the return direction against the urging force of the return spring 78 and when the pulley 82 is rotated in the return direction by the urging force of the return spring 78. The amount of tightening of the coiled portion 78A of the return spring 78 is changed, and the axial dimension of the coiled portion 78A is changed, whereby the pulley 82 is moved in the rotational axis direction by the return spring 78 and the sector gear 142 The outer radial portion (including the rod 148) is moved together with the pulley 82 in the rotational axis direction of the pulley 82 (the rotational axis direction of the sector gear 142). For this reason, when the pulley 82 is rotated and the sector gear 142 is rotated, the sector gear 142 is deformed by the pulley 82, and the rod 148 of the sector gear 142 moves to the rotation axis direction side of the sector gear 142 and the sector gear 142. It is tilted (displaced) in the rotational radial direction.

  Here, the tilt center axis of the sensor housing 58 of the acceleration sensor 56 (center axis of the housing pin 64) and the rotation center axis of the sector gear 142 (center axis of the gear support shaft 132) are arranged on the same axis. The connection hole 58A of the sensor housing 58 is extended in the rotational radial direction of the sector gear 142 (the tilting radial direction of the sensor housing 58), and the rod 148 is directed to the sector gear 142 rotational axis direction side and the sector gear 142 rotational radial direction side. Allow tilting. Therefore, the sector gear 142 is rotated in a state where the tilting central axis of the sensor housing 58 and the rotation central axis of the sector gear 142 are arranged on the same axis, and the rod 148 is rotated on the sector gear 142 rotation axis side and the sector gear 142. When tilted in the rotational radial direction, the peripheral surface of the connection hole 58A can be restrained from restricting the tilt of the rod 148, and the sector gear 142 (rod 148) smoothly moves the sensor housing 58 (connection hole 58A). Can be tilted.

  In addition, as described above, the connection hole 58A of the sensor housing 58 is extended in the rotation radial direction of the sector gear 142 (the tilting radial direction of the sensor housing 58), and the sector gear 142 rotation diameter between the connection hole 58A and the rod 148 of the sector gear 142 is increased. Relative movement in the direction is allowed. For this reason, when the sector gear 142 is rotated, even if the rod 148 is tilted to the rotation radial direction side of the sector gear 142, the sensor housing 58 (connection hole 58A) with respect to the rotation position of the sector gear 142 (rod 148). The tilt position of the sensor housing 58 relative to the rotational position of the sector gear 142 can be increased.

  Further, the rod 148 of the sector gear 142 passes through the connection hole 58 </ b> A of the sensor housing 58. For this reason, when the sector gear 142 is rotated, even if the rod 148 is tilted to the rotation axis direction side of the sector gear 142, the connection of the rod 148 to the connection hole 58A can be suppressed. Moreover, since the connection hole 58A passes through the vertical wall 62 of the sensor housing 58, the connection hole 58A can be easily formed in the vertical wall 62.

  A circular hole 144 (gear support shaft 132 of the gear case 72) of the sector gear 142 is disposed on the upper side of the device from the upper side end (bending portion) of the extension portion 22A of the leg plate 22 of the frame 20. For this reason, compared with the case where the circular hole 144 is disposed on the apparatus lower side from the apparatus upper end of the extension part 22A, the apparatus lower end of the sector gear 142 can be disposed on the apparatus right side, and the leg plate 22 (the extension part 22A is The projection of the sector gear 142 to the left side of the device can be reduced, and the gear case 72 can be downsized in the left-right direction of the device.

  Further, a bent portion 78 </ b> B is formed at the other side end of the return spring 78. For this reason, the seat back 14 is suddenly tilted to the rear side of the vehicle, and the pulley 82 is suddenly rotated in the direction opposite to the return direction (the direction of arrow D in FIG. 5 and the like). Even if 82A is rotated in the direction opposite to the return direction with respect to the other side portion of the return spring 78, the convex portion 82A is brought into contact with the bent portion 78B, and the convex portion 82A at the other end portion of the return spring 78. It is restricted that the contact with the is released. Thereby, even if it does not enlarge the extension dimension from the coil-shaped part 78A of the other end part of the return spring 78, the contact with the convex part 82A of the other end part of the return spring 78 is released. The extension dimension from the coiled portion 78A at the other end of the return spring 78 can be reduced, and the return spring 78 can be downsized.

  Moreover, the convex portion 82A is separated from the bent portion 78B in the return direction. For this reason, when the convex part 82A is brought into contact with the bent part 78B, the impact between the convex part 82A and the bent part 78B can be reduced, and the load on the convex part 82A and the bent part 78B can be reduced. .

  In the present embodiment, the connection hole 58A of the sensor housing 58 is a through hole. However, the connection hole 58A of the sensor housing 58 may be a recess.

  Further, in the present embodiment, the rod 148 is provided in the sector gear 142 and the connection hole 58A is provided in the sensor housing 58. However, the sector gear 142 may be provided with the connection hole 58 </ b> A (connection portion) and the sensor housing 58 may be provided with the rod 148 (connection portion).

10 Webbing take-up device 26 Spool 28 Webbing 41 Lock mechanism (restriction mechanism)
56 Acceleration sensor (detection mechanism)
58A Connection hole (connected part)
142 Sector gear (Rotating body)
148 Rod (connection part)

The present invention is, in consideration of the aforementioned, the connection in the case where the rotating body is rotating body is rotated the connection portion of the rotating body by being displaced in the rotational axis direction is displaced in the rotational axis direction of the rotary body An object of the present invention is to obtain a webbing take-up device that can prevent the displacement of the rotating member from being restricted and the rotating body can tilt the detection mechanism smoothly.

A webbing take-up device according to a first aspect of the present invention is a spool in which a webbing to be worn by an occupant of a vehicle is taken up, the webbing is drawn out and rotated in the drawing direction, and a detection mechanism that detects acceleration of the vehicle. A limiting mechanism that restricts rotation of the spool in the pull-out direction in response to vehicle acceleration detected by the detection mechanism, a rotating body that is rotated when the spool is tilted, and a rotating body. The rotating body is rotated to displace the rotating body in the direction of the rotation axis, the connection part being displaced in the direction of the rotation axis of the rotating body, the detection mechanism, and the connection part A connected portion that is connected, the rotating body is rotated to tilt the detection mechanism, and the connecting portion is allowed to displace in the rotational axis direction side of the connecting portion at a connection position of the connecting portion; Prepare.

Here, when the rotating body is rotated and the rotating body is displaced to the rotating shaft direction side, the connecting portion is displaced to the rotating shaft direction side of the rotating body, and the connection portion is connected at the connection position to the connected portion. Displacement of the portion in the direction of the rotational axis of the rotating body is allowed. For this reason, when a rotating body is rotated and a rotating body is displaced to the rotating shaft direction side, when a connection part is displaced to the rotating shaft direction side of a rotating body, it suppresses that the displacement of a connecting part is restrict | limited. The rotating body can tilt the detection mechanism smoothly.

Claims (4)

A spool that is wound up by a webbing to be mounted on a vehicle occupant, and that is pulled out and rotated in a pulling-out direction;
A detection mechanism for detecting acceleration of the vehicle;
A limiting mechanism for limiting rotation of the spool in the pull-out direction in response to vehicle acceleration detected by the detection mechanism;
A rotating body that is rotated by tilting the spool;
A connecting portion provided on the rotating body, wherein the rotating body is rotated and displaced toward a rotation axis direction of the rotating body;
While being provided in the detection mechanism, the connecting portion is connected, the rotating body is rotated and the detecting mechanism is tilted, and at the connection position of the connecting portion, the connecting portion toward the rotating body rotation axis direction side Connected parts where displacement of
A webbing take-up device comprising:   The webbing take-up device according to claim 1, wherein a tilt center axis of the detection mechanism and a rotation center axis of the rotating body are arranged on the same axis.   The webbing take-up device according to claim 1 or 2, wherein relative movement of the connecting portion and the connected portion in the rotational diameter direction of the rotating body is allowed.   4. The webbing take-up device according to claim 1, wherein one of the connection part and the connected part passes through the other of the connection part and the connected part. 5.