JP2011173558A - Pretensioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pretensioner capable of moving the tip side of a buckle and a webbing belt in a suitable direction in response to the seating position of an occupant in a seat. <P>SOLUTION: In this pretensioner 10, when a pretensioner body 64 operates when an anchor plate 30 is in a position of an ordinary seating state, a pin 80 arranged in the anchor plate 30 is guided by a guide hole 86 and slides backward and downward, and a pin 78 is guided by the guide hole 86 and slides backward and downward. While, the tip side of the anchor plate 30 is positioned forward more than the ordinary seating state in a forward dislocated state, and when the pretensioner body 64 operates in this state, the pin 80 is guided by a guide hole 88, and the anchor plate 30 rotates so that the tip side of the anchor plate 30 moves downward. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pretensioner that increases the tension of a webbing belt by pulling a buckle of a seat belt device or a tip of a webbing belt in a vehicle sudden deceleration state, for example.

  The pretensioner (seat belt preloader) disclosed in the fourth embodiment of Patent Document 1 below includes external teeth formed at the other end of the guide plate and external teeth disposed below the guide plate. The gear is engaged. Furthermore, a pulley formed coaxially and integrally with the gear and a pulley provided coaxially and integrally with the rotation center axis when reclining the seat back are connected by a timing belt. Yes.

  As a result, the guide plate is rotated about an axis whose axial direction is the width direction of the seat in conjunction with the rotation of the seat back, the pretensioner is activated, and the piston in the preloader cylinder is moved via the wire to the movable piece. The direction of movement of the movable piece when pulling the wing can be set according to the inclination state of the seat back, and among the webbing belts that restrains the occupant's body, in particular, restraint of the lap belt that restrains the occupant's waist The direction in which the force presses the occupant's waist can be changed.

JP-A-8-40205

  By the way, in addition to the case where the seat back is rotated, even if the occupant's buttocks seated on the seat are in a front-slip state where the seat is in front of the normal seating position, the lap belt of the occupant by the lap belt can be used during sudden vehicle deceleration. Is preferably pressed against the seat cushion side (ie, downward).

  An object of the present invention is to obtain a pretensioner that can move the front side of a buckle or a webbing belt in a suitable direction in accordance with the seating position of an occupant in the seat in consideration of the above facts.

  In the pretensioner according to the first aspect of the present invention, the driving means for outputting the driving force in a specific direction and the front end side of the webbing belt formed in a long belt shape are directly or indirectly locked. An anchor member rotatable around an axis having the width direction of the sheet as an axial direction and a tongue provided at a middle portion in the longitudinal direction of the webbing belt can be rotated around an axis having the width direction of the sheet as an axial direction. Directly or indirectly when one of the buckles is in a predetermined position corresponding to the position of the intermediate portion of the webbing belt between the tongue and the tip of the webbing belt, which changes according to the seating position of the occupant A first guide portion that is engaged with each other, guides one of the ones from one end side to the other end side by the driving force of the driving means, and moves either one of them to the rear of the seat. In addition, when one of the two is positioned in front of the seat with respect to the predetermined position, the one of the two is engaged directly or indirectly, and the driving force of the driving unit is used to Guide means having a second guide portion for guiding one of the two from the one end side to the other end side and moving either one of them to the lower side of the sheet.

  In the pretensioner according to the first aspect of the present invention, for example, the occupant is seated on the seat in a normal seating state, so that one of the anchor member and the buckle is in accordance with the seating position of the occupant. In the case where the intermediate portion of the webbing belt is in a predetermined position between the tongue and the tip of the webbing belt, either the anchor member or the buckle is directly or indirectly attached to the first guide portion of the guide means. Engaging. When a driving force is output from the driving means in this state, one of the anchor member and the buckle is guided from one end side to the other end side of the first guide portion.

  As a result, one of the anchor member and the buckle is moved to the rear side of the seat, and as a result, the tongue attached to the buckle at the front end of the webbing belt locked to the anchor member or at the middle portion in the longitudinal direction of the webbing belt. The portion that passes through is moved rearward of the seat. By the webbing belt thus moved, the occupant's body is pressed against the seat back constituting the seat, thereby preventing, for example, inertial movement of the occupant's body to the front side of the vehicle due to sudden deceleration of the vehicle, for example. Or it can be suppressed.

  On the other hand, in the front-slip state in which the occupant's buttocks are positioned forward of the normal seating position, the webbing belt is pulled forward of the seat by the occupant's body rather than in the normal seating state. Thereby, in this state, the buckle and the anchor member are positioned in front of the seat as compared with the normal seating state. In this state, one of the anchor member and the buckle is directly or indirectly engaged with the second guide portion of the guide means. When a driving force is output from the driving means in this state, one of the anchor member and the buckle is guided from one end side to the other end side of the first guide portion.

  As a result, one of the anchor member and the buckle is moved to the lower side of the seat, and as a result, the tongue attached to the buckle at the front end of the webbing belt locked to the anchor member or the longitudinal intermediate portion of the webbing belt. The portion that passes through is pressed against the seat cushion by pressing the occupant's body downward. Accordingly, it is possible to prevent or suppress the occupant's body from moving so as to dive between the seat cushion and the webbing belt.

  In the pretensioner according to the present invention, if one of the anchor member and the buckle is in a predetermined position, one of the anchor member and the buckle is moved to the rear of the seat by the driving force of the driving means, and either one of the anchor member and the buckle is in the predetermined position. If it is located on the front side of the seat, either one of them is moved downward by the driving force of the driving means. For this reason, one of the anchor member and the buckle can always be moved backward or downward of the seat as long as the driving force is output from the driving means.

  A pretensioner according to a second aspect of the present invention is the pretensioner according to the first aspect of the present invention, wherein the driving means is connected to one of the anchor member and the buckle, and the driving force of the driving means is used. In addition to connecting means for moving one of the above in a predetermined direction, one of the two moved by the connecting means is guided and moved by the first guide part or the second guide part.

  In the pretensioner according to the second aspect of the present invention, when the driving force is output from the driving means, any one of the anchor member and the buckle is connected to the connecting means for connecting the driving means and one of the anchor member and the buckle. One of them is moved in a predetermined direction. Here, when the occupant is seated on the seat in a normal seating state and one of the anchor member and the buckle is in a predetermined position, the anchor member and the buckle are placed on the first guide portion of the guide means. Either one of the anchor member or the buckle is guided by the first guide portion of the guide means and moved rearward of the seat by the connecting means.

  On the other hand, when the buckle or the anchor member is positioned in front of the seat in the front-sliding state, either the anchor member or the buckle is directly or indirectly attached to the second guide portion of the guide means. One of the anchor member and the buckle is guided by the second guide portion of the guide means and moved downward by the connecting means.

  A pretensioner according to a third aspect of the present invention is the pretensioner according to the first aspect of the present invention, wherein the guide means is coupled to the driving means, and the guide means is moved in a predetermined direction by the driving force of the driving means. At the same time, when the guide means moves in a predetermined direction, either one of the guide means moves while being guided by the first guide portion or the second guide portion.

  In the pretensioner according to the third aspect of the present invention, when the driving force is output from the driving unit, the guide unit moves in a predetermined direction by the driving force of the driving unit. Here, when the occupant is seated on the seat in a normal seating state and one of the anchor member and the buckle is in a predetermined position, the anchor member and the buckle are placed on the first guide portion of the guide means. Any one of the engagement member is directly or indirectly engaged, and when the guide means is moved in a predetermined direction by the driving force of the drive means, one of the anchor member and the buckle is interlocked with the guide means. It is guided by the first guide part and moves rearward of the seat.

  On the other hand, when the buckle or the anchor member is positioned in front of the seat in the front-sliding state, either the anchor member or the buckle is directly or indirectly attached to the second guide portion of the guide means. When the guide means moves in a predetermined direction by the driving force of the drive means, one of the anchor member and the buckle is guided to the second guide portion of the guide means in conjunction with this, and the lower part of the seat Move to.

  As described above, the pretensioner according to the present invention can move the front end side of the buckle or webbing belt in a suitable direction according to the seating position of the occupant in the seat.

1 is a side view from the inside in the vehicle width direction schematically showing the overall configuration of a seat belt device to which a pretensioner according to a first embodiment of the present invention is applied. It is a side view in the normal seating state which shows roughly the composition of the pretensioner concerning a 1st embodiment of the present invention. It is a side view corresponding to FIG. 2 which shows the state which act | operated by the normal seating state. FIG. 3 is a side view corresponding to FIG. It is a side view corresponding to FIG. 4 which shows the state which act | operated in the front state. It is a side view in the normal seating state which shows roughly the structure of the pretensioner which concerns on the 2nd Embodiment of this invention. It is a side view corresponding to FIG. 6 which shows the state which act | operated by the normal seating state. It is a side view corresponding to FIG. It is a side view corresponding to FIG. 8 which shows the state which act | operated in the forward state. It is a side view which shows roughly the structure of the pretensioner based on the 3rd Embodiment of this invention. It is sectional drawing which shows roughly the structure of the pretensioner which concerns on the 3rd Embodiment of this invention. It is a side view corresponding to FIG. 10 which shows a normal seating state. It is a side view corresponding to FIG. 12 which shows the state which act | operated in the normal seating state and the slider moved along the long hole. It is a side view corresponding to FIG. 13 which shows the state by which the webbing belt was pulled by the normal seating state. It is a side view corresponding to FIG. FIG. 16 is a side view corresponding to FIG. 15 illustrating a state in which the slider is moved along the long hole by operating in a forward state. FIG. 17 is a side view corresponding to FIG. 16 showing a state in which the webbing belt is pulled in a forward-slung state.

<Configuration of First Embodiment>
FIG. 1 is a side view schematically showing the configuration of a seat belt device 12 to which a pretensioner 10 according to a first embodiment of the present invention is applied. Prior to the description of the configuration of the pretensioner 10, the overall configuration of the seat belt device 12 will be described.

(Outline of the seat belt device 12)
As shown in FIG. 1, the seat belt device 12 includes, for example, a webbing take-up device 16 fixed to the vehicle body in the vicinity of the center pillar 14 of the vehicle. The webbing take-up device 16 includes a spool 18 whose axial direction is substantially along the longitudinal direction of the vehicle. The spool 18 is locked with the base end side in the longitudinal direction of the webbing belt 20 formed in a long belt shape having flexibility, and the base end side of the webbing belt 20 is wound around the outer peripheral part of the spool 18 with respect to the intermediate part in the longitudinal direction. It has been.

  For this reason, when the webbing belt 20 is pulled to the front end side in the longitudinal direction, the webbing belt 20 wound around the spool 18 is pulled out from the spool 18 and the spool 18 rotates in one pulling direction around the axis. When the spool 18 is rotated in the winding direction opposite to the pulling direction, the webbing belt 20 is wound and stored on the spool 18 from the proximal end side in the longitudinal direction. Further, the webbing take-up device 16 includes a spool urging means (not shown) formed by a spiral spring or the like. The spool urging means increases the urging force when the spool 18 rotates in the pull-out direction, and urges the spool 18 in the winding direction. Thus, after the webbing belt 20 is pulled out from the spool 18, the webbing belt 20 can be wound around and stored in the spool 18 by the biasing force of the spool biasing means.

The webbing belt 20 drawn from the spool 18 is extended above the vehicle along the center pillar 14 described above, and passes through a slit hole formed in a slip joint 22 provided in the vicinity of the upper end portion of the center pillar 14. It is almost folded back below the vehicle. Thus, an anchor plate 30 as an anchor member is provided on the side in the width direction of the sheet 26 and in the vicinity of the rear end of the sheet 26 corresponding to the front end of the webbing belt 20 that has passed through the slit hole of the slip joint 22. ing. The anchor plate 30 is formed in a plate shape whose thickness direction is approximately the width direction of the vehicle.

A belt locking portion 32 is formed on the anchor plate 30. A belt passing hole 34 is formed in the belt locking portion 32 so as to penetrate the belt locking portion 32 in the thickness direction. The belt passing hole 34 has a narrow inner width and is curved so that the longitudinal direction opens toward the lower side of the vehicle. The front end side of the webbing belt 20 passes through the belt passage hole 34 and is folded upward. Further, the front end side of the webbing belt 20 that has passed through the belt passage hole 34 is overlapped with each other in the thickness direction and stitched with the portion of the webbing belt 20 on the proximal end side from the belt passage hole 34. Thereby, the front end side of the webbing belt 20 is locked to the anchor plate 30.

  A tongue 40 is provided on the webbing belt 20 between a front end portion of the webbing belt 20 locked to the anchor plate 30 and a folded portion of the webbing belt 20 in the slip joint 22. The tongue 40 is located on the opposite side of the webbing retractor 16 and the anchor plate 30 via the seat 26, and the seat cushion frame 42 that supports the cushion material of the seat cushion 28 and the vehicle floor 44 (this embodiment). In the form, it can be attached to the buckle 46 attached to the seat cushion frame 42).

  When the tongue 40 is pulled toward the buckle 46 while the occupant is seated on the seat 26 and the tongue 40 is attached to the buckle 46, the webbing belt 20 is attached to the occupant's body. In this wearing state, the portion of the webbing belt 20 between the tongue 40 and the slip joint 22 is a shoulder belt, and restrains the vicinity of the waist from the shoulder of the occupant through the chest. On the other hand, a portion between the tongue 40 and the anchor plate 30 of the webbing belt 20 is a lap belt, and restrains the occupant's waist.

(Configuration of pretensioner 10)
Next, the configuration of the present pretensioner 10 will be described.

  As shown in FIGS. 1 and 2, the pretensioner 10 includes a frame 62. The frame 62 is formed, for example, in a box shape, and the floor portion 44 is located behind the sheet 26 on the side opposite to the side where the buckle 46 of the sheet 26 is provided (the side where the webbing take-up device 16 is provided). And the seat cushion frame 42 (in this embodiment, the floor 44).

  As shown in FIGS. 1 and 2, the frame 62 is provided with a pretensioner main body 64 as a driving means. The pretensioner main body 64 includes a cylindrical cylinder 66 whose axial direction is along the front-rear direction of the seat 26. The front end side of the cylinder 66 along the axial direction of the cylinder 66 (that is, the front side of the intermediate portion along the front-rear direction of the seat 26 in the cylinder 66) enters the inside of the frame 62. A piston 68 is slidably disposed along the axial direction of the cylinder 66 inside the cylinder 66.

  Further, a generator mounting portion 70 is provided on the tip end side in the axial direction of the cylinder 66 from the initial position of the piston 68 in the cylinder 66. The generator mounting portion 70 is formed in a cylindrical shape, and its axial direction intersects the axial direction of the cylinder 66. The generator attachment portion 70 is connected to the cylinder 66 at the axial base end portion, and the inside of the generator attachment portion 70 and the inside of the cylinder 66 communicate with each other. A gas generator 72 is attached to the generator attachment portion 70.

  The gas generator 72 is electrically connected to an ECU (not shown) as control means. When an activation signal output from the ECU is input to an ignition device in the gas generator 72, a gas provided in the gas generator 72 is provided. The generating agent is burned to generate gas instantaneously, and this gas is supplied into the cylinder 66. When the internal pressure of the cylinder 66 is increased by the gas supplied from the gas generator 72 as described above, the piston 68 moves to the base end side of the cylinder 66 (that is, the rear side of the seat 26) as shown in FIGS. Slide.

  As shown in FIG. 2, the longitudinal end of the wire 74 as a connecting means is locked to the piston 68. The wire 74 is drawn from the tip of the cylinder 66 to the front side of the seat 26 in the cylinder 66.

  On the other hand, as shown in FIGS. 1 and 2, the anchor plate 30 includes a guided piece 76. The guided piece 76 is formed in a plate shape whose thickness direction is along the width direction of the sheet 26, and is connected to the belt locking portion 32 at the front end portion thereof. As shown in FIG. 2, the guided piece 76 enters the inside of the frame 62. A pin 78 is provided at the base end in the longitudinal direction of the guided piece 76 entering the frame 62.

  The pin 78 is formed in a cylindrical shape whose axial direction is along the width direction of the sheet 26 and is covered so as to protrude from one surface in the thickness direction of the guided piece 76 (the surface on the front side in FIG. 2). A guide piece 76 is formed. Further, a pin 80 is provided at a portion of the intermediate portion in the longitudinal direction of the guided piece 76 that enters the frame 62. Like the pin 78, the pin 80 is formed in a cylindrical shape whose axial direction is along the width direction of the sheet 26. From the one surface in the thickness direction of the guided piece 76 (the front surface in FIG. 2). It is formed in the guided piece 76 so as to protrude.

  Further, a guide stay 82 as a guide means is attached to the frame 62 on one side in the thickness direction of the guided piece 76 (the front side in FIG. 2). A guide hole 84 is formed in the guide stay 82. The guide hole 84 is a long hole whose upper end is positioned on the front side of the sheet 26 with respect to the lower end, and the tip end side of the pin 78 enters the inside of the guide hole 84. The inner width dimension of the guide hole 84 is slightly larger than the outer diameter dimension of the pin 78. Therefore, the pin 78 can move between both ends in the longitudinal direction of the guide hole 84. The displacement of the pin 78 in the direction intersecting with the longitudinal direction of the hole 84 is restricted by the inner peripheral portion of the guide hole 84.

  A guide hole 86 as a first guide portion is formed above the guide stay 82 from the guide hole 84. The longitudinal direction of the guide hole 86 is the same as the longitudinal direction of the guide hole 84, and the longitudinal dimension thereof is a long hole substantially equal to the longitudinal dimension of the guide hole 84. The pin 80 passes through the guide hole 86, and the tip side of the pin 80 protrudes on the opposite side to the guided piece 76 of the guide hole 84. The inner width dimension of the guide hole 84 is slightly larger than the outer diameter dimension of the pin 78. Therefore, basically, the pin 80 can move between both longitudinal ends of the guide hole 86 in the guide hole 86. The displacement of the pin 80 in the direction intersecting the longitudinal direction of the guide hole 84 such as the inner width direction of the hole 84 is restricted by the inner peripheral portion of the guide hole 86.

  However, a guide hole 88 as a second guide portion is connected to the upper end of the guide hole 86 (the end portion of the guide hole 86 opposite to the guide hole 84). The guide hole 88 is curved with the pin 78 in the state where the pin 80 is in contact with the upper end of the guide hole 86 as the center of curvature. The inner width dimension of the guide hole 88 is slightly larger than the outer diameter dimension of the pin 78, so that the guided piece 76 tilts downward about the pin 78 with the pin 80 in contact with the upper end of the guide hole 86. When rotating in this manner, the pin 80 enters the guide hole 88.

  Further, the side of the guide hole 88 opposite to the portion connected to the guide hole 86 is opened at the outer peripheral portion of the guide stay 82. Outside the opening of the guide hole 88 in the outer peripheral portion of the guide stay 82, the outer peripheral portion of the guide stay 82 continues from a portion of the inner peripheral portion of the guide hole 88 located on the curvature center side of the guide hole 88. The outer periphery of the guide stay 82 is curved within a certain range with the same curvature.

  A guide pin 90 is formed near the lower end of the guide stay 82. The guide pin 90 is formed in a cylindrical shape whose axial direction is along the width direction of the seat 26, and is formed so as to protrude from the surface of the guide stay 82 opposite to the anchor plate 30. The distal end side of the wire 74 drawn from the distal end of the cylinder 66 is wound around the guide pin 90 and then the distal end is locked to the pin 80.

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

(Operation of the pretensioner 10 in the normal sitting state)
The occupant's back fully touches the seat back 88 of the seat 26, and the occupant hangs the webbing belt 20 around the body with the occupant's buttocks fully seated on the seat 26 located behind the seat cushion 28. 2, the pin 80 is in contact with the upper end of the guide hole 86, and the direction from the axial center of the pin 80 to the axial center of the pin 78 is as shown in FIG. And along the longitudinal direction of the guide hole 86.

  When the vehicle suddenly decelerates and an activation signal is output from the ECU, the ignition device in the gas generator 72 is activated and the gas generating agent in the gas generator 72 is combusted. As a result, when the gas generated instantaneously in the gas generator 72 is supplied into the cylinder 66 and the internal pressure of the cylinder 66 rises, the piston 68 in the cylinder 66 is moved to the base of the cylinder 66 as shown in FIG. Slide to the end side. When the piston 68 slides to the base end side of the cylinder 66 in this way, the wire 74 whose base end portion is locked to the piston 68 is pulled and moves together with the piston 68 to the base end side of the cylinder 66.

  When the wire 74 is pulled in this manner, the pin 80 with which the tip end portion of the wire 74 is locked is pulled, whereby the pin 80 is guided by the guide hole 86 and moves to the lower end side of the guide hole 86. As the pin 80 moves to the lower end side of the guide hole 86 in this manner, the guided piece 76 of the anchor plate 30 is pulled in the direction from the upper end to the lower end of the guide hole 86, that is, below the seat 26 and rearward. Further, the pin 78 also moves to the lower end side of the guide hole 84, that is, below the seat 26 and rearward.

  As the anchor plate 30 moves in this manner, the tip of the webbing belt 20 is pulled downward and rearward of the seat 26, and the occupant's body is pressed against the seat back 88 of the seat 26. Thereby, it can prevent or suppress that a passenger | crew's body carries out inertial movement to the vehicle front side because a vehicle decelerates rapidly.

(Operation of the pretensioner 10 in a forward state)
On the other hand, the occupant's buttocks are positioned in front of the seat cushion 28 than in the normal sitting state, and the webbing belt 20 is hung on the body in the forward slouch state where the occupant's body is sleeping rather than the normal sitting state, and the tongue 40 is buckled In the state of being attached to 46, the webbing belt 20 is pulled forward than in the normal seating state. For this reason, in this forward-strained state, as shown in FIG. 4, the pin is arranged so that the tip side of the anchor plate 30 is displaced forward of the seat 26 by the webbing belt 20 pulled forward of the seat 26 than in the normal seating state. As shown in FIG. 4, the anchor plate 30 rotates around the center of the pin 78 so that a part of the pin 80 enters the guide hole 88.

  In this state, the pretensioner main body 64 is actuated and the wire 74 is pulled toward the proximal end side of the cylinder 66, so that when the pin 80 attempts to move downward, the pin 80 interferes with the inner peripheral portion of the guide hole 88. Is done. When the pin 80 is further pulled by the wire 74 in a state where the pin 80 is interfered with the inner peripheral portion of the guide hole 88 as described above, the pin 80 is guided by the guide hole 88 and is pin 78 as shown in FIG. Around the center of the seat 26 so as to tilt forward.

  As a result, when the anchor plate 30 rotates so that the distal end side of the anchor plate 30 moves downward of the seat 26, the distal end of the webbing belt 20 moves downward of the seat 26 together with the anchor plate 30, and the occupant's waist is placed on the seat 26. Press against the seat cushion 28. Accordingly, it is possible to prevent or suppress movement of the occupant's body so as to dive between the seat cushion 28 and the webbing belt 20 due to inertia when the vehicle suddenly decelerates.

  Thus, in the present pretensioner 10, the occupant's body can be appropriately restrained by pulling the webbing belt 20 in an appropriate direction according to the seating posture of the occupant in the seat 26. In addition, when the anchor plate 30 is tilted to such an extent that the pin 80 moves downward and interferes with the inner peripheral portion of the guide hole 88, the anchor plate 30 is rotated so that the tip side of the anchor plate 30 is tilted forward of the seat 26. Otherwise, the pin 80 and the pin 78 are guided in the guide hole 86 and the guide hole 84 so that the anchor plate 30 can be moved rearward and downward of the seat 26, so that the gas generator 72 is operated. The webbing belt 20 can always be pulled backward or downward of the seat 26.

  Moreover, in the present pretensioner 10, the direction in which the webbing belt 20 is pulled can be switched depending on the position of the occupant's waist according to the seating posture of the occupant in the seat 26 without performing any special operation.

<Configuration of Second Embodiment>
Next, other embodiments of the present invention will be described. In describing each of the following embodiments, the same parts as those in the previous embodiment are basically the same as those in the embodiment described above including the first embodiment. Reference numerals are assigned and detailed description thereof is omitted.

(Configuration of pretensioner 110)
FIG. 6 shows a schematic configuration of a pretensioner 110 according to the second embodiment of the present invention in a side view from the same direction as FIG. 2 explaining the first embodiment.

  As shown in FIG. 6, the present pretensioner 110 includes a pretensioner body 112 as a driving means instead of the pretensioner body 64. The pretensioner body 112 is attached to the frame 62 inside the frame 62. The pretensioner main body 112 includes a cylinder 114. Unlike the cylinder 66 of the pretensioner main body 64 in the first embodiment, the cylinder 114 is formed in a cylindrical shape whose axial direction is along the vertical direction of the seat 26.

  A piston 116 is provided inside the cylinder 114 so as to be slidable in the vertical direction of the cylinder 114. A gas generator 72 is attached to the lower end of the cylinder 114. When the gas generated by the operation of the gas generator 72 is supplied to the cylinder 114 and the internal pressure of the cylinder 114 rises, the piston 116 moves to the cylinder 114. Slide upward. A rack bar 118 is formed on the end surface of the piston 116 opposite to the gas generator 72. The rack bar 118 is formed in a rod shape having a rectangular section in the longitudinal direction along the vertical direction of the seat 26, and rack teeth are formed on the front end surface of the seat 26 in the rack bar 118.

  On the other hand, an opening 120 is formed above the initial position of the piston 116 in the cylinder 114, and a pinion support portion 122 is formed in the cylinder 114 corresponding to the opening 120. The pinion support portions 122 are formed in a plate shape whose thickness direction is along the width direction of the sheet 26, and are formed on both sides of the opening 120. A support shaft 124 is provided between the pinion support portions 122. The support shaft 124 has an axial direction along the width direction of the seat 26, and one end thereof is supported by one pinion support portion 122 and the other end is supported by the other pinion support portion 122. A pinion 126 is rotatably supported on the support shaft 124. A part of the pinion 126 passes through the opening 120 and enters the cylinder 114, and meshes with the rack teeth of the rack bar 118.

  A guide plate 132 as guide means is provided on the side of the pinion 126 in the axial direction. The guide plate 132 is formed in a plate shape whose thickness direction is along the width direction of the sheet 26, and is integrated with the pinion 126.

  On the other hand, an anchor plate 134 as an anchor member replacing the anchor plate 30 is provided on the front side of the seat 26 with respect to the pinion support portion 122. Unlike the anchor plate 30 in the first embodiment, the anchor plate 134 has a support shaft 136 passing through the vicinity of the end opposite to the side where the belt passage hole 34 is formed. The support shaft 136 is formed in a cylindrical shape whose axial direction is along the width direction of the seat 26, and at least one end thereof is supported by the frame 62. The anchor plate 134 is rotatably supported around the support shaft 136.

  Further, this anchor plate 134 has one surface in the thickness direction (the surface on the depth side in FIG. 6) facing the guide plate 132. A pin 138 is formed on the surface of the anchor plate 134 facing the guide plate 132. The pin 138 is formed in a cylindrical shape whose axial direction is along the width direction of the sheet 26. A guide hole 144 as a first guide portion is formed in the guide plate 132 corresponding to the pin 138. The guide hole 144 is a long hole whose inner width dimension is larger than the diameter dimension of the pin 138. Further, one end in the longitudinal direction of the guide hole 144 is positioned in front of and below the seat 26 with respect to the other end in the longitudinal direction. Therefore, the longitudinal direction of the guide hole 144 is the seat 26 with respect to the front-rear direction of the seat 26. It is inclined around an axis whose axial direction is the width direction.

  The guide plate 132 has a guide hole 146 as a second guide portion. The guide hole 146 is a long hole whose inner width dimension is slightly larger than the diameter dimension of the pin 138. In addition, one end in the longitudinal direction of the guide hole 146 is located behind and below the seat 26 with respect to the other end in the longitudinal direction. Therefore, the longitudinal direction of the guide hole 146 is relative to the longitudinal direction of the seat 26. It is inclined around an axis whose axial direction is the width direction. One end of the guide hole 146 in the longitudinal direction is connected to one end of the connection hole 148. The connecting hole 148 is a hole that is curved so that its inner peripheral portion protrudes upward.

  The other end of the connecting hole 148 is connected to one end in the longitudinal direction of the guide hole 144, and the guide hole 144, the connecting hole 148, and the guide hole 146 are generally V-shaped. The guide hole 144 and the guide hole 146 are such that the pin 138 enters the guide hole 144 at one end in the longitudinal direction of the guide hole 144 in a normal seating state, and the pin 138 guides at one end in the longitudinal direction of the guide hole 146 in the forward-sliding state. It is set to enter the hole 146.

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

(Operation of the pretensioner 110 in the normal sitting state)
In the present pretensioner 110, the vehicle is suddenly decelerated in the normal seating state, and when an activation signal is output from the ECU, the pretensioner body 112 is operated to supply gas into the cylinder 114, whereby the cylinder 114 When the internal pressure increases, the piston 116 slides above the cylinder 114 in the cylinder 114. As described above, when the piston 116 is lifted, the rack bar 118 is also lifted, and thereby the pinion 126 meshing with the rack teeth of the rack bar 118 is rotated. When the pinion 126 rotates, the guide plate 132 integrated with the pinion 126 rotates so as to lower the tip end side (the side of the guide plate 132 opposite to the pinion 126 where the guide hole 144 or the guide hole 146 is formed). .

  Here, in the normal seating state, since the pin 138 is positioned on one end side of the guide hole 144, when the guide plate 132 is rotated so that the tip end side of the guide plate 132 is lowered as described above, FIG. 7 shows. As described above, the pin 138 located on one end side of the guide hole 144 is moved to the other end side of the guide hole 144, so that the anchor plate 134 moves around the support shaft 136 so that the tip end side thereof moves rearward of the seat 26. To be rotated. Thus, the anchor plate 134 rotates so that the front end side of the anchor plate 134 moves to the rear of the seat 26, whereby the front end of the webbing belt 20 moves to the rear of the seat 26 together with the anchor plate 134, and the body of the occupant is seated on the seat. 26 against the 26 seat backs 88. Thereby, it can prevent or suppress that a passenger | crew's body carries out inertial movement to the vehicle front side because a vehicle decelerates rapidly.

(Operation of the pretensioner 110 in a forward state)
On the other hand, in the front lean state, the webbing belt 20 is pulled forward by the occupant's body more than in the normal seating state. For this reason, in this forward-slung state, as shown in FIG. 8, the anchor plate 134 is displaced forwardly of the seat 26 by the webbing belt 20 pulled forward of the seat 26 than in the normal seating state. The plate 134 rotates around the support shaft 136. As a result, as shown in FIG. 9, the pin 138 moves from the vicinity of one end of the guide hole 144 to the vicinity of one end of the guide hole 146.

  In this state, when the pretensioner body 112 operates and the guide plate 132 rotates so that the tip end side of the guide plate 132 is lowered, the pin 138 located on one end side of the guide hole 146 moves to the other end side of the guide hole 146. As a result, the anchor plate 134 is rotated around the support shaft 136 so that the tip end side thereof moves in front of the seat 26 and downward. Thus, the anchor plate 134 rotates so that the front end side of the anchor plate 134 moves forward and downward of the seat 26, so that the front end of the webbing belt 20 moves below the seat 26 together with the anchor plate 134. The waist is pressed against the seat cushion 28 of the seat 26. Accordingly, it is possible to prevent or suppress movement of the occupant's body so as to dive between the seat cushion 28 and the webbing belt 20 due to inertia when the vehicle suddenly decelerates.

  As described above, the present pretensioner 110 can appropriately restrain the occupant's body by pulling the webbing belt 20 in an appropriate direction in accordance with the seating posture of the occupant on the seat 26. Moreover, if the guide plate 132 rotates so that the tip end side of the guide plate 132 is lowered, the pin 138 always moves to the guide hole 144 and one of the other ends. For this reason, when the gas generator 72 is operated, the belt locking portion 32 can be always rotated rearward or downward of the seat 26, and the webbing belt 20 can be always pulled backward or downward of the seat 26.

  Moreover, in the present pretensioner 110, the direction in which the webbing belt 20 is pulled can be switched depending on the position of the occupant's waist according to the seating posture of the occupant in the seat 26 without performing any special operation.

<Configuration of Third Embodiment>
Next, a third embodiment of the present invention will be described.

  FIG. 10 shows a schematic configuration of the pretensioner 160 according to the present embodiment in a side view from the same direction as FIG. 2 for explaining the first embodiment.

  As shown in this figure, the present pretensioner 160 includes a plate-shaped guide plate 162 as a guide means whose thickness direction is along the width direction of the sheet 26. The guide plate 162 includes a base 164. Unlike the guide stay 82 in the first embodiment, the base 164 of the guide plate 162 is fastened and fixed to the front end side of the pretensioner main body 64 by a bolt 166.

  A support plate 168 is provided on one side of the guide plate 162 in the thickness direction (the depth side in FIG. 10). The support plate 168 is a plate-like member whose thickness direction is along the thickness direction of the guide plate 162. A stepped bolt 170 passes through the support plate 168 in the thickness direction of the support plate 168 on the base end side in the longitudinal direction of the support plate 168. The stepped bolt 170 further penetrates the guide plate 162, and a support plate 168 is rotatably connected to the guide plate 162 around the stepped bolt 170.

  On the opposite side of the support plate 168 from the guide plate 162, an anchor plate 172 is provided as an anchor member in place of the anchor plate 30 in the first embodiment and the anchor plate 134 in the second embodiment. Yes. The anchor plate 172 is a plate-like member whose thickness direction is along the width direction of the sheet 26, and a slit hole 174 whose longitudinal direction is along the width direction of the anchor plate 172 is formed at the tip side. The front end side of the webbing belt 20 passes through the hole 174 and is folded.

  In this embodiment, such a slit hole 174 is formed in the anchor plate 172. However, the slit hole 174 is curved like the anchor plate 30 in the first embodiment and the anchor plate 134 in the second embodiment. The belt passage hole 34 may be formed in place of the slit hole 174. Further, the distal end of the wire 74 is locked to the proximal end side in the longitudinal direction of the anchor plate 172.

  On the other hand, the guide plate 162 has a guide hole 182 as a first guide portion. The guide hole 182 is a long hole whose longitudinal direction is inclined with respect to the front end portion of the seat 26 so that the rear end portion is located below the seat 26. The guide plate 162 has a guide hole 184 as a second guide portion. The guide hole 184 is an elongated hole whose inner width dimension is substantially equal to the inner width dimension of the guide hole 182 and is inclined so that the rear end side is positioned below the sheet 26 with respect to the front end side of the sheet 26 along the longitudinal direction. ing.

  A connecting hole 186 is formed between the front end (upper end) of the guide hole 182 and the front end (upper end) of the guide hole 184, and the front end (upper end) of the guide hole 182 and the guide hole 184 are formed by the connecting hole 186. The front end (upper end) is connected to each other. The connecting hole 186 is formed in an arc shape in which a portion of the inner peripheral portion facing the rear of the seat 26 is curved at a certain angle around the central axis of the stepped bolt 170.

  A slider 192 is provided at a portion where the guide hole 182 and the guide hole 184 are connected. The shape of the slider 192 as viewed along the thickness direction of the guide plate 162 is a substantially isosceles triangle. When the shape of the slider 192 is regarded as an isosceles triangle, the length of the bisector of two sides (excluding the base) is the inner width dimension of the guide hole 182, the guide hole 184, and further the connecting hole 186. Is set smaller than. Therefore, the slider 192 can slide between the end portion of the guide hole 182 opposite to the connecting hole 186 and the end portion of the guide hole 184 opposite to the connecting hole 186, and the guide hole 182 and the guide hole 184. Furthermore, it can slide in the inner width direction inside the connecting hole 186.

  Further, the portion corresponding to the base when the shape of the slider 192 is regarded as an isosceles triangle is curved so as to follow the portion facing the rear of the seat 26 in the inner peripheral portion of the connecting hole 186 described above. For this reason, in a state where the slider 192 is inside the connecting hole 186, the slider 192 can rotate along the connecting hole 186 around the central axis of the stepped bolt 170.

  A stepped bolt 198 passes through the slider 192 in the thickness direction of the guide plate 162. A long hole 202 is formed in the support plate 168 corresponding to the slider 192. The long hole 202 has a longitudinal direction along the longitudinal direction of the support plate 168 and an inner width dimension set to be slightly larger than the diameter dimension of the shaft portion of the stepped bolt 198.

  The stepped bolt 198 passes through the long hole 202, and the stepped bolt 198 can move between one end and the other end in the longitudinal direction of the long hole 202. Further, as shown in the sectional view of FIG. 11, a circular hole 208 is formed in the anchor plate 172 corresponding to the long hole 202. The inner diameter of the circular hole 208 is slightly larger than the outer diameter of the shaft portion of the stepped bolt 198, and the shaft portion of the stepped bolt 198 passes through the circular hole 208.

  The slider 192 is formed with a rotation restricting piece 212. The rotation restricting piece 212 enters the long hole 202 and is in contact with both sides in the inner width direction of the inner peripheral portion of the long hole 202. Thereby, although the stepped bolt 198 can rotate around its central axis, the rotation of the slider 192 relative to the long hole 202 is restricted.

  Further, a shear pin 222 is provided on the tip side of the anchor plate 172 from the position where the circular hole 208 is formed. The shear pin 222 passes through both the support plate 168 and the anchor plate 172 and connects both the support plate 168 and the anchor plate 172. As described above, since the shaft portion of the stepped bolt 198 passes through the long hole 202 in the support plate 168, the stepped bolt 198 moves in the longitudinal direction in the long hole 202, so that the stepped bolt 198 moves relative to the support plate 168. The anchor plate 172 can be relatively displaced in the longitudinal direction of the long hole 202, but the support plate 168 and the anchor plate 172 are connected by the shear pin 222, so that the shear pin 222 extends along the longitudinal direction until the shear pin 222 is broken. The relative displacement of the anchor plate 172 with respect to the support plate 168 is restricted.

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

(Operation of the pretensioner 160 in the normal sitting state)
In the present pretensioner 160, the tip of the anchor plate 172 tends to move above the seat 26 around the stepped bolt 170 by the tension of the webbing belt 20 in a normal seating state. As a result, as shown in FIG. 12, the support plate 168 has the anchor plate 172 connected to the support plate 168 by the shear pin 222 and the rotation restricting piece 212 to restrict the relative rotation with respect to the long hole 202. As a result, the connecting hole 186 rotates around the stepped bolt 170 toward the guide hole 182 side.

  In this normal seating state, the vehicle suddenly decelerates, and when a start signal is output from the ECU, the pretensioner body 64 is operated, and when the longitudinal base end side of the wire 74 is drawn to the base end side of the cylinder 66, The anchor plate 172 attempts to move to the longitudinal direction proximal end side (stepped bolt 170 side) of the support plate 168, whereby the shear pin 222 is first broken. When the shear pin 222 is broken in this way and the relative displacement of the anchor plate 172 with respect to the support plate 168 becomes possible, the stepped portion that has been located at the end opposite to the stepped bolt 170 in the long hole 202 until then. As shown in FIG. 13, the bolt 198 slides with the slider 192 toward the stepped bolt 170 in the long hole 202. Accordingly, the slider 192 interferes with a portion on the guide hole 182 side in the inner peripheral portion of the connecting hole 186 or the inner peripheral portion of the guide hole 182.

  As described above, in this state, since the slider 192 interferes with the inner peripheral portion of the connecting hole 186 on the guide hole 182 side or the inner peripheral portion of the guide hole 182, the longitudinal direction of the wire 74 is further increased in this state. When the base end side is pulled to the base end side of the cylinder 66, the slider 192 is pulled to the side opposite to the connection hole 186 of the guide hole 182. As described above, when the slider 192 is pulled to the opposite side of the guide hole 182 from the connecting hole 186, the anchor plate 172 rotates with respect to the support plate 168 around the stepped bolt 198. Further, the slider 192 slides to the opposite side of the guide hole 182 from the connecting hole 186 with the anchor plate 172.

  As described above, the anchor plate 172 moves to the opposite side of the guide hole 182 from the connecting hole 186 along with the slider 192, so that the tip of the webbing belt 20 and the anchor plate 172 are seated together with the anchor plate 172 as shown in FIG. 26, the passenger's body is pressed against the seat back 88 of the seat 26. Thereby, it can prevent or suppress that a passenger | crew's body carries out inertial movement to the vehicle front side because a vehicle decelerates rapidly.

(Operation of the pretensioner 160 in the forward state)
On the other hand, in the front-slip state, the webbing belt 20 is pulled forward toward the occupant's lower back than in the normal seating state. For this reason, the tip of the anchor plate 172 tends to move forward of the seat 26 around the stepped bolt 170 by the tension of the webbing belt 20. Accordingly, as shown in FIG. 15, the support plate 168 rotates with the anchor plate 172 and the slider 192 around the stepped bolt 170 toward the guide hole 184 side of the connection hole 186.

  When the vehicle is suddenly decelerated in this forward lean state and a start signal is output from the ECU, the pretensioner main body 64 is operated, and when the longitudinal direction proximal end side of the wire 74 is drawn to the proximal end side of the cylinder 66, The anchor plate 172 attempts to move to the longitudinal direction proximal end side (stepped bolt 170 side) of the support plate 168, whereby the shear pin 222 is first broken. When the shear pin 222 is broken in this way and the relative displacement of the anchor plate 172 with respect to the support plate 168 becomes possible, the stepped portion that has been located at the end opposite to the stepped bolt 170 in the long hole 202 until then. As shown in FIG. 16, the bolt 198 slides with the slider 192 toward the stepped bolt 170 in the long hole 202. Accordingly, the slider 192 interferes with a portion on the guide hole 184 side in the inner peripheral portion of the connection hole 186 or the inner peripheral portion of the guide hole 184.

  As described above, in this state, the slider 192 interferes with the inner peripheral portion of the connecting hole 186 on the guide hole 184 side or the inner peripheral portion of the guide hole 184. When the base end side is pulled to the base end side of the cylinder 66, the slider 192 is pulled to the side opposite to the connection hole 186 of the guide hole 184. As described above, when the slider 192 is pulled to the side opposite to the connecting hole 186 of the guide hole 184, the anchor plate 172 rotates with respect to the support plate 168 around the stepped bolt 198. Further, the slider 192 slides to the opposite side of the guide hole 182 from the connecting hole 186 with the anchor plate 172.

  As described above, the anchor plate 172 moves to the opposite side of the guide hole 184 from the connecting hole 186 along with the slider 192, so that the tip of the webbing belt 20 and the anchor plate 172 are seated together with the anchor plate 172 as shown in FIG. 26, the occupant's waist is pressed against the seat cushion 28 of the seat 26. Accordingly, it is possible to prevent or suppress movement of the occupant's body so as to dive between the seat cushion 28 and the webbing belt 20 due to inertia when the vehicle suddenly decelerates.

  As described above, the pretensioner 160 can appropriately restrain the occupant's body by pulling the webbing belt 20 in an appropriate direction according to the seating posture of the occupant on the seat 26. In addition, when the shape of the slider 192 is substantially isosceles triangle and the wire 74 pulls the anchor plate 172 to move the slider 192, the apex portion when the shape of the slider 192 is regarded as isosceles triangle is the connecting hole 186 or The guide hole 182 or the inner periphery of the guide hole 184 interferes.

  Therefore, if the slider 192 is positioned on the guide hole 182 side in the connection hole 186, the wire 74 pulls the anchor plate 172 in this state, and the apex portion of the slider 192 becomes the inner periphery of the connection hole 186 or the guide hole 182. Then, the slider 192 moves toward the end of the guide hole 182 opposite to the connecting hole 186.

  If the slider 192 is positioned on the guide hole 184 side in the connecting hole 186, the wire 74 pulls the anchor plate 172 in this state, and the apex portion of the slider 192 is the inner peripheral portion of the connecting hole 186 or the guide hole 184. Then, the slider 192 moves toward the end of the guide hole 184 opposite to the connecting hole 186.

  For this reason, it is possible to switch the slide direction of the slider 192 by detecting with high sensitivity whether the occupant is seated on the seat 26 in a normal state or seated on the seat 26 in a forward-sliding state.

  The pretensioners 10, 110, and 160 according to each of the above embodiments are configured to correspond to the anchor plates 30, 134, and 172 to which the tip of the webbing belt 20 is locked. Correspondingly, pretensioners 10, 110, 160 may be provided.

  Moreover, in the said 1st Embodiment, although the wire 74 was used as the connection means which comprises this invention of Claim 2, the structure of a connection means is not limited to such a wire 74. FIG. For example, as described in the second embodiment, the anchor plate 134 is connected to the driving means via the rack and pinion and a lever that rotates together with the pinion, and the driving force of the driving means is applied to the rack and pinion. The anchor plate 134 may be moved by transmitting to the lever via the lever and moving the lever.

  On the other hand, in the second embodiment, the driving force of the pretensioner main body 112 as the driving means is transmitted to the guide plate 132 as the guide means via the rack bar 118 and the pinion 126. From the viewpoint of the present invention described in 3, the configuration of the transmission means for transmitting the driving force of the driving means to the guide means is not limited to such rack bar 118 and pinion 126. For example, a configuration in which the longitudinal base end portion is connected to the piston 116 of the pretensioner main body 112 as the driving means and the longitudinal tip portion is connected to the guide plate 132 is used as a transmission means to transmit the driving force of the driving means to the guide means. Also good.

10 Pretensioner 20 Webbing belt 26 Seat 30 Anchor plate (anchor member)
40 tongue 46 buckle 64 pretensioner body (drive means)
74 Wire (connection means)
82 Guide stay (guide means)
86 Guide hole (first guide part)
88 Guide hole (second guide part)
110 Pretensioner 112 Pretensioner body (drive means)
132 Guide plate (guide means)
134 Anchor plate (anchor member)
144 Guide hole (first guide part)
146 Guide hole (second guide part)
160 Pretensioner 162 Guide plate (guide means)
172 Anchor plate (anchor member)
182 Guide hole (first guide part)
184 Guide hole (second guide part)

Claims (3)

Driving means for outputting a driving force in a specific direction;
Provided at the middle of the webbing belt in the longitudinal direction of the anchor member which can be rotated around an axis whose axial direction is the width direction of the sheet while the front end side of the webbing belt formed in a long belt shape is directly or indirectly locked Any one of the buckles that can rotate around an axis whose axial direction is the width direction of the seat on which the received tongue is mounted is the tongue that changes according to the seating position of the occupant and the tip of the webbing belt. When the webbing belt is in a predetermined position corresponding to the position of the intermediate portion of the webbing belt, it engages directly or indirectly, and one of the above is guided from one end side to the other end side by the driving force of the driving means. A first guide portion that moves one of the rearward to the rear of the seat, and when one of the first guide portion is positioned further to the front of the seat than the predetermined position. A second guide portion that directly or indirectly engages, guides one of the above from one end side to the other end side with the driving force of the driving means, and moves one of the above to the lower side of the seat Guide means having:
Pretensioner with   One of the anchor member and the buckle is connected to the driving means, and includes a connecting means for moving one of the driving means in a predetermined direction by the driving force of the driving means, and is moved by the connecting means. 2. The pretensioner according to claim 1, wherein one of the first and second guide portions moves while being guided by the first guide portion or the second guide portion.   The guide means is connected to the drive means, and the guide means is moved in a predetermined direction by the driving force of the drive means, and any one of the guide means is moved in the predetermined direction so that one of the first guides is the first guide. The pretensioner according to claim 1, wherein the pretensioner moves while being guided by a portion or the second guide portion.

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