JP2007238030A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device which allows the inertia movement of a vehicle occupant in an abrupt slowdown of a vehicle even not only in a shoulder belt portion side but a lap belt portion side. <P>SOLUTION: A tip of the lap belt portion 30 of a waving belt 18 to restrain the occupant's waist portion is engaged with an anchor 54 of a lap pretensioner 42 installed in the lower part of a seat 16. A sill bar 60 is installed in a longitudinal base end side of the lap belt portion 30 apart from the lap tensioner 42. The lap belt portion 30 is brought in contact with a support 70 at the lower side of the support 70 to change the longitudinal direction. When the tension greater than a predetermined magnitude is imparted to the lap belt portion 30, and the tension is applied to the support 70, a deforming portion 72 bent in a waveform shape is extended to move the support 70 by one portion. Looseness generates in the lap belt portion 30 by one movement of the support 70. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seat belt device for restraining the body of an occupant seated in a seat.

The seat belt device disclosed in the following Patent Document 1 includes a pair of webbing take-up devices, and one of the webbing belts has one shoulder belt side end as a boundary at the folded portion of the tongue plate. The webbing take-up device is engaged with the spool, and the other lap belt side end with the folded portion as a boundary is engaged with the other webbing take-up device spool.
Japanese Patent Laid-Open No. 11-20613

  Normally, the webbing take-up device is applied with a pretensioner mechanism that forcibly rotates the spool in the direction of winding the webbing belt when the vehicle is suddenly decelerated, or a tension greater than a predetermined amount acts on the webbing belt when the spool is locked. In this case, various mechanisms such as a force limiter (load limiter) mechanism that allows a predetermined amount of the webbing belt to be pulled out while the energy absorbing member is deformed are provided. However, in the seat belt device disclosed in Patent Document 1, a so-called force limiter mechanism is not provided in the webbing retractor on the lap belt side. For this reason, the force limiter mechanism operates on the shoulder belt side to allow the inertial movement of the occupant's body in the vehicle sudden deceleration state, but the lap belt side allows the occupant's body inertia in the vehicle rapid deceleration state. Movement is not allowed or the allowable amount is smaller than the shoulder belt side.

  In view of the above facts, an object of the present invention is to provide a seat belt device that can allow the vehicle occupant's inertial movement in the vehicle sudden deceleration state not only on the shoulder belt portion side but also on the lap belt portion side.

  The seat belt device according to the first aspect of the present invention supports a longitudinal intermediate portion of a lap belt portion that restrains a waist portion of a body of a vehicle occupant among long belt webbing belts, with the support position as a boundary. The direction of the other lap belt part is changed with respect to the other, and the support position of the lap belt part is changed while being deformed by receiving a tension of a predetermined magnitude or more acting on the lap belt part. The support means which short-circuits the passage locus of a part is provided.

  In the seat belt device according to the first aspect of the present invention, for example, the waist portion of the occupant's body, to which the lap belt portion of the webbing belt is attached, is inertially moved by inertia of the vehicle suddenly decelerating, thereby causing the lap belt. When the portion is pulled with a force of a predetermined size or more, and a tension of a predetermined size or more acts on the lap belt portion, the support means supporting the intermediate portion in the longitudinal direction of the lap belt portion receives the tension. And deform. In this way, since the support means is deformed, the passing trajectory of the lap belt portion is short-circuited. Therefore, the lap belt portion is loosened by the amount of the short circuit, and the waist of the occupant's body can be moved.

  According to a second aspect of the present invention, there is provided a seat belt device according to the first aspect of the present invention, wherein the front end of the lap belt portion whose direction is changed at the support position is held and the vehicle is rapidly decelerated. A pretensioner that pulls the tip of the lap belt portion in a state to increase the tension of the lap belt portion is provided.

  In the seat belt device according to the second aspect of the present invention, when the vehicle suddenly decelerates, the pretensioner operates and the tip of the lap belt portion is pulled. Thus, the tension | tensile_strength of a lap belt part increases by the lap belt part being pulled, and the restraint force which a lap belt part provides to a passenger | crew's body increases. As a result, the inertial movement of the occupant body accompanying the sudden deceleration of the vehicle is prevented or effectively suppressed.

  Here, in the seat belt device according to the present invention, since the support means is provided on the proximal end side rather than the distal end side of the lap belt portion connected to the pretension, the force limiter mechanism is not provided in the pretensioner or the vicinity thereof. Also good. Thereby, for example, a pretensioner can be reduced in size compared with the structure which provided the force limiter mechanism in the pretensioner.

  According to a third aspect of the present invention, the seat belt device according to the present invention is formed in an elongated belt shape as a whole, and a predetermined range on the tip side from the longitudinal intermediate portion is used as a lap belt portion, and the lap is mounted. A webbing belt whose belt part restrains the waist of a vehicle occupant, storage means for retracting and storing the webbing belt from the proximal end side, and a distal end side of the lap belt part are connected, and the lap belt part is in a sudden deceleration state of the vehicle. A pretensioner that forcibly pulls the belt, and is deformed by a tension of a predetermined magnitude or more applied to the lap belt portion, and is allowed to move along with the lap belt portion. A deformation portion.

  In the seat belt device according to the third aspect of the present invention, the webbing belt is pulled out from the storage means and attached to the body of the vehicle occupant. In this wearing state, the waist of the occupant's body is restrained by the lap belt portion of the webbing belt. When the vehicle suddenly decelerates in such a restrained state, the pretensioner operates and the leading end side of the lap belt portion is pulled. By pulling the lap belt portion in this way, tension is applied to the lap belt portion, and the lap belt portion restrains the occupant's waist with a larger restraining force. As a result, it is possible to prevent or effectively suppress the occupant's body from inertially moving toward the vehicle front side in the vehicle sudden deceleration state.

  In this state, when the vehicle further decelerates abruptly, the occupant's body tends to move inertially toward the front side of the vehicle. As a result, when the occupant's body pulls the lap belt portion with a greater force, the pretensioner The provided deformation portion is deformed, and the pretensioner moves together with the lap belt portion. The lap belt is loosened at least by the amount of movement of the pretensioner, and the occupant's body can move.

  A seat belt device according to a fourth aspect of the present invention is the seat belt device according to any one of the first to third aspects, wherein the tip of the lap belt portion whose direction is changed by the support means is It is characterized by being held under the seat.

  In the seat belt device according to the fourth aspect of the present invention, the front end side of the lap belt portion is changed in direction by the support means and extended to the lower side of the seat, and is held below the seat. In this way, by extending the front end side of the lap belt portion below the seat, it is possible to secure a sufficient installation space for holding means such as an anchor member for holding the front end of the lap belt portion and the pretensioner on the lap belt portion side.

  As described above, in the seat belt device according to the first aspect of the present invention, the inertial movement of the occupant's waist can be allowed by deforming the support means even in the lap belt.

  In the seat belt device according to the second aspect of the present invention, the restraining force by the lap belt portion can be improved in the vehicle sudden deceleration state.

  In the seatbelt device according to the third aspect of the present invention, the inertial movement of the occupant's waist can be permitted by the deformation of the lap belt.

  In the seat belt device according to the fourth aspect of the present invention, the leading end side of the lap belt portion is extended below the seat, so that the holding means such as an anchor member for holding the leading end of the lap belt portion or the lap belt portion side is provided. Enough space for the pretensioner can be secured.

<Configuration of First Embodiment>
FIG. 1 is a perspective view showing a configuration of a seat belt device 10 according to a first embodiment of the present invention, and FIG. 3 is a view of the seat belt device 10 viewed from a substantially rear side of the vehicle. ing.

  As shown in these drawings, the seat belt device 10 includes a webbing take-up device 12 as storage means. The webbing take-up device 12 includes a frame 14. The frame 14 is, for example, disposed behind the seat 16 installed in the interior of the vehicle and near the lower end of the center pillar of the vehicle, and is fixed to the vehicle body by fastening means such as bolts. A spool (not shown) whose axial direction is substantially along the vehicle front-rear direction is rotatably supported on the frame 14.

  The longitudinal base end of the flexible belt-like webbing belt 18 is locked to the spool, and when the spool rotates in one winding direction around its own axis, the webbing belt 18 is attached to the spool. When the webbing belt 18 is wound and stored, and the webbing belt 18 is pulled toward the tip, the webbing belt 18 wound on the spool is rotated substantially in the vehicle upper side while the spool is rotated in the pull-out direction opposite to the winding direction. Pulled out.

  The webbing take-up device 12 includes a spiral spring that urges the spool in the take-up direction, and a torsion shaft that is provided at the axial center portion of the spool and is integrally connected to the spool at one axial end portion or an intermediate portion. Force limiter mechanism configured to include a lock that operates to engage directly or indirectly with the other axial end of the torsion shaft and restrict rotation in the other axial end of the torsion shaft in the pull-out direction The mechanism further includes a pretensioner mechanism (not shown) that forcibly rotates the spool in the winding direction when operated.

  As shown in FIG. 1, a shoulder anchor 20 is provided on the upper side of the webbing take-up device 12, for example, in the vicinity of the upper end of the center pillar. The shoulder anchor 20 is supported by the vehicle body so as to be rotatable about an axis whose axial direction is substantially the left-right direction of the vehicle. A slit hole 22 is formed in the shoulder anchor 20, and the webbing belt 18 drawn out from the spool of the webbing take-up device 12 passes through the slit hole 22 and is drawn substantially downward in the vehicle. A tongue plate 24 is provided on the front end side of the webbing belt 18 with respect to the shoulder anchor 20.

  A slit hole 26 is formed in the tongue plate 24, and the webbing belt 18 passes through the slit hole 26. Thus, the tongue plate 24 is guided by the webbing belt 18 and can move within a predetermined range in the longitudinal direction of the webbing belt 18. The tongue plate 24 can be attached to a buckle device 27 (see FIG. 2) provided on the opposite side of the webbing take-up device 12 via the seat 16, and the vehicle occupant 76 (see FIG. 2) is attached to the seat 16. 2), the webbing belt 18 is wound around the body of the occupant 76, and when the tongue plate 24 is held by the buckle device 27, the webbing belt 18 is attached to the body of the occupant 76.

  In this state, the shoulder anchor 20 side of the webbing belt 18 with respect to the tongue plate 24 (that is, the base end side with respect to the tongue plate 24) becomes the shoulder belt portion 28 to restrain the range from the shoulder portion of the occupant 76 to the chest portion, The side opposite to the shoulder belt portion 28 via the tongue plate 24 of the webbing belt 18 is a lap belt portion 30 that restrains the waist of the occupant 76. In FIG. 1, the tongue plate 24 is not held by the buckle device 27, and the webbing belt 18 is not attached to the body of the occupant 76, but for the sake of convenience, the shoulder anchor 20 side is closer to the shoulder anchor 20 side than the tongue plate 24. A belt portion 28 is provided, and the opposite is a lap belt portion 30.

  On the other hand, as shown in FIG. 3, a storage portion 34 is formed below the floor portion 32 of the vehicle (in FIG. 1, the floor portion 32 and the storage portion 34 are not shown). The accommodating part 34 includes a base part 36. A leg portion 38 is fixed to the base portion 36, and at least a portion below the intermediate portion of the leg portion 38 along the substantially vertical direction of the vehicle is accommodated in the accommodating portion 34. A guide rail 40 is fixed on the leg portion 38. The guide rail 40 is formed in a longitudinal direction substantially along the vehicle front-rear direction, and the front end side and the rear end side thereof are fixed to the leg portion 38 (in FIG. 1 and FIG. 2, the leg portion on the rear end side of the guide rail 40). Only 38 are shown).

  The guide rails 40 are provided on the left and right sides of the seat 16, respectively, and these guide rails 40 are arranged in parallel to each other. In these cylinders 46, a slide member (not shown) attached to the seat 16 below the seat 16 is engaged with the guide rail 40, and the slide member is guided to the guide rail 40 in a substantially longitudinal direction of the vehicle. The position of the seat 16 can be slid back and forth by sliding it.

  As shown in FIG. 1, a lap pretensioner 42 as a pretensioner is disposed below the seat 16. As shown in FIG. 3, the lap pretensioner 42 is mounted on a pedestal 44 fixed on a base portion 36 in the accommodating portion 34. As shown in FIGS. 1 and 3, the lap pretensioner 42 includes a cylinder 46. The cylinder 46 is formed in a bottomed cylindrical shape (particularly in the present embodiment, a bottomed cylindrical shape) in which the axial direction is substantially along the left-right direction of the vehicle and the end on the outer side of the substantially left-right direction of the vehicle is closed. . A generator accommodating portion 48 is provided on the side surface of the cylinder 46 in the vicinity of the end portion of the cylinder 46 on the outer side in the vehicle lateral direction.

  The generator accommodating portion 48 is formed in a cylindrical shape (in particular, a cylindrical shape in the present embodiment) whose axial direction is substantially along the vehicle vertical direction. One end of the generator housing portion 48 facing substantially upward of the vehicle is opened, and the other end is opened at the inner peripheral surface of the cylinder 46, and the inside of the cylinder 46 and the inside of the generator housing portion 48 communicate with each other. Yes. A gas generator 50 is mounted on the generator housing 48 from the upper end side. The gas generator 50 contains, for example, a gas generating agent that instantly generates gas when ignited and burned.

  The gas generator 50 is connected to acceleration detection means for detecting whether or not the vehicle has suddenly decelerated via a control device (ECU) (not shown), and an output signal from the acceleration detection means when the vehicle has suddenly decelerated. Is input to the control device, the control device operates the ignition means accommodated in the gas generator 50 to burn the gas generating agent. The gas generator 50 is mounted on the generator housing 48 so that the generated gas is ejected toward the other end of the generator housing 48, so that the gas generated in the gas generator 50 is not separated from the generator housing 48. It is supplied into the cylinder 46 from the end.

  A piston (not shown) is accommodated in the cylinder 46, and the piston is moved toward the end of the cylinder 46 at the center side in the vehicle lateral direction by the internal pressure of the cylinder 46 that is raised by supplying gas into the cylinder 46. Slides. The longitudinal end of the rod 52 is integrally connected to the piston. The rod 52 is elongated along the axial direction of the cylinder 46, and the tip end side extends substantially outward in the left-right direction of the vehicle and further protrudes outward of the cylinder 46. An anchor portion 54 is formed at the tip of the rod 52.

  As shown in FIG. 1, the anchor portion 54 is formed with a slit hole 56 that is substantially longitudinal in the vehicle front-rear direction, and the vicinity of the front end portion of the webbing belt 18 is folded back after passing through the slit hole 56. The both ends of the webbing belt 18 with the folded portion 56 as a boundary are joined by stitching or the like, so that the leading end side of the webbing belt 18 is locked to the anchor portion 54.

  On the other hand, as shown in FIG. 3, a sill bar 60 as a support means is provided on the outer side of the lap pretensioner 42 in the housing portion 34 substantially in the lateral direction of the vehicle. The sill bar 60 includes a pair of legs 62 and 64. Each of the leg portions 62 and 64 is formed in a long bar shape substantially along the vehicle vertical direction, and is disposed so as to face each other along the vehicle longitudinal direction. A mounting portion 66 is formed at each lower end portion of the leg portions 62 and 64. The attachment portions 66 are formed in a substantially annular shape penetrating substantially in the left-right direction of the vehicle, and a pair of support shafts 68 whose one ends are fixed to predetermined portions of the base portion 36 and the vehicle body enter the attachment portions 66 and enter the leg portions 62. , 64 are supported.

  On the other hand, the support part 70 is continuously formed from the upper end of the leg part 62 relatively located in the vehicle front side among the leg parts 62 and 64. The support portion 70 is formed in a rod shape whose longitudinal direction is substantially along the vehicle front-rear direction, and is connected to the leg portion 62 at the front end in the longitudinal direction. The front end side of the webbing belt 18 that has passed through the slit hole 26 of the tongue plate 24 is located from the outside of the support part 70 along the vehicle left-right direction, and the front end side of the webbing belt 18 is in contact with the support part 70. In the state, it passes below the support part 70 and reaches the slit hole 56. That is, the webbing belt 18 does not follow the straight shortest path between the slit hole 22 of the shoulder anchor 20 and the slit hole 56 of the anchor portion 54, and bypasses the lower side of the support portion 70.

  A deformed portion 72 is formed between the rear end of the support portion 70 and the upper end of the leg portion 64. Unlike the support portion 70, the deformable portion 72 is formed to be bent or curved in a wave shape between the rear end of the support portion 70 and the upper end of the leg portion 64. Of the deformed portion 72 that is deformed in a wave shape, a portion that is coupled to the rear end portion of the support portion 70 is a restricting portion 74. The restricting portion 74 has an end opposite to the supporting portion 70 with respect to the connecting portion with the supporting portion 70 and is inclined substantially downward in the vehicle. The space between the leg portion 62 and the vicinity of the upper end portion of the restricting portion 74 (that is, the coupling portion with the support portion 70) is substantially equal to the width dimension of the webbing belt 18, and the webbing belt 18 that has passed under the support portion 70 has the leg portion 62. Inadvertent displacement in the vehicle front-rear direction is regulated by the interference with the regulation part 74.

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

  In the present seat belt device 10, when the tongue plate 24 is pulled by the occupant 76 seated on the seat 16, tension is applied to the webbing belt 18 via the tongue plate 24, whereby the webbing take-up device 12 is wound around the spool. The webbing belt 18 taken out is pulled out. The webbing belt 18 is pulled out and the webbing belt 18 is wound around the front side of the body of the occupant 76, and the tongue plate 24 is tanged to the buckle device 27 provided on the opposite side of the webbing take-up device 12 via the seat 16. A plate 24 is mounted. When the tongue plate 24 is thus held by the buckle device 27, the webbing belt 18 is attached to the body of the occupant 76 seated on the seat 16, and the body of the occupant 76 is restrained by the webbing belt 18.

  When the traveling vehicle is suddenly decelerated in such a state that the webbing belt 18 is attached to the body of the occupant 76, a lock mechanism provided in the webbing retractor 12 is activated. The lock mechanism locks the other end of the torsion shaft and restricts the rotation of the torsion shaft in the pull-out direction. In this state, if the vehicle suddenly decelerates continuously, or if the vehicle suddenly decelerates suddenly and this state is detected by the acceleration detecting means such as an acceleration sensor, the output from the acceleration detecting means at this time Based on the signal, a control device such as an ECU activates a pretensioner mechanism provided in the webbing take-up device 12 and activates the gas generator 50 of the lap pretensioner 42.

  When the pretensioner mechanism of the webbing take-up device 12 is actuated, the spool is suddenly rotated in the pull-out direction, and the webbing belt 18 is taken up on the spool from the base end side. On the other hand, when the gas generator 50 is operated, the gas generating agent in the gas generator 50 burns and gas is instantaneously generated. The gas generated in the gas generator 50 is supplied into the cylinder 46. As a result, the internal pressure of the cylinder 46 rises, and the piston inside the cylinder 46 is slid toward the center in the vehicle lateral direction by the increased internal pressure.

  When the piston slides in this way, the rod 52 is pulled substantially toward the center in the left-right direction of the vehicle, and the tip of the webbing belt 18 is further pulled toward the center in the left-right direction of the vehicle. As described above, when the proximal end side of the shoulder belt portion 28 of the webbing belt 18 is forcibly taken up by the spool of the webbing take-up device 12, the tension of the shoulder belt portion 28 increases, and the shoulder belt portion 28 The binding force applied to the range from the chest to the shoulder increases.

  Moreover, the tension | tensile_strength of the lap belt part 30 increases because the front end side of the lap belt part 30 is pulled by the rod 52 among the webbing belts 18, and the restraint force which the lap belt part 30 provides to the waist part of the body increases. Thereby, in this seatbelt apparatus 10, the restraining force of both the shoulder belt part 28 of the webbing belt 18 and the lap belt part 30 can be increased.

  Further, when the body of the occupant 76 seated on the seat 16 is about to inertially move forward due to sudden deceleration of the vehicle, the shoulder belt portion 28 of the webbing belt 18 is pulled. As described above, in a state where the rotation of the other end of the torsion shaft in the pull-out direction is restricted by the lock mechanism of the webbing retractor 12, the tensile force applied to the shoulder belt portion 28 from the body of the occupant 76 is a predetermined value. When the rotational force of the spool in the pull-out direction exceeds a predetermined size, the torque between the connecting portion of the torsion shaft and the other end of the torsion shaft is restricted. Torsional deformation occurs.

  The webbing belt 18 is allowed to be pulled out from the spool by the amount of torsional deformation of the torsion shaft, and the range from the chest portion to the shoulder portion of the occupant 76 restrained by the shoulder belt portion 28 pulls out the shoulder belt portion 28 to substantially the vehicle. While being able to move forward, a part of the kinetic energy when the body of the occupant 76 inertially moves forward is absorbed by the torsional deformation of the torsion shaft.

  On the other hand, as described above, when the body of the occupant 76 moves inertially toward the front side of the vehicle, the lumbar part of the occupant 76 also tries to move. When the waist portion of the occupant 76 attempts to move inertially toward the front side of the vehicle, the lap belt portion 30 of the webbing belt 18 is pulled. When the tension of the lap belt portion 30 is increased by the tensile force applied to the lap belt portion 30 in this manner, the lap belt portion 30 pulls the rod 52.

  Further, when the tension applied to the lap belt portion 30 exceeds the mechanical strength of the deformed portion 72 of the sill bar 60, the lap belt portion 30 pulls the support portion 70, and as shown in FIG. 60, in particular, the deforming portion 72 is deformed. When the sill bar 60 (particularly, the deforming portion 72) is deformed by the tension of the lap belt portion 30, the position of the substantial support portion 70 in contact with the lap belt portion 30 changes, and the trajectory of the lap belt portion 30 is changed. Short circuit.

  Thus, the lap belt portion 30 is loosened by the amount of change in the position in contact with the lap belt portion 30, and the waist portion of the occupant 76 restrained by the lap belt portion 30 is approximately the amount of looseness of the lap belt portion 30. While being able to move to the front side of the vehicle, the deformation of the sill bar 60 absorbs part of the kinetic energy when the body of the occupant 76 inertially moves forward.

  Thus, in the present embodiment, not only the shoulder belt portion 28 side of the webbing belt 18 but also the lap belt portion 30 side allows the inertial movement of the waist of the occupant 76 due to the deformation of the sill bar 60, Part of the kinetic energy of the body of the occupant 76 that moves inertial can be absorbed.

  Further, in the present embodiment, the front end side of the lap belt portion 30 (webbing belt 18) extends to the lower side of the seat 16 and is connected to the lap pretensioner 42 disposed on the lower side of the seat 16. For this reason, compared with the structure which provides the lap pretensioner 42 in the narrow space between the seats 16 below the center pillar, the installable range of the lap pretensioner 42 is widened, and the shape of the lap pretensioner 42 is designed. The degree of freedom is also improved. In addition, since the lap pretensioner 42 is disposed below the seat 16, a part of the lap pretensioner 42 does not overlap the range of the opening for getting on and off formed on the side wall of the vehicle. There is no hindrance to the passenger 76 getting on and off.

  Further, a sill bar 60 for interfering with the lap belt portion 30 (webbing belt 18) from above and changing the direction of the front end side of the lap belt portion 30 (webbing belt 18) to the lower side of the seat 16 is provided in the vehicle suddenly. The torsion shaft has the same function as the torsion shaft provided in the webbing take-up device 12 as described above by being pulled by the body of the occupant 76 who is about to move inertially toward the front side of the vehicle in the deceleration state. There is no need to provide a corresponding member in particular, the number of parts can be substantially reduced, and the cost can be reduced.

  Further, since a sill bar 60 is provided on the outer side of the lap pretensioner 42 substantially in the lateral direction of the vehicle from the lap pretensioner 42, a function equivalent to that of the torsion shaft is added to the lap pretensioner 42. Thus, the lap pretensioner 42 can be reduced in size.

  In the present embodiment, the deformed portion 72 is provided on one end side (rear end side) of the support portion 70 in the longitudinal direction. However, the deformable portion 72 may be provided on both longitudinal sides of the support portion 70. Good.

<Configuration of Second Embodiment>
Next, a modified example of the sill bar 60 in the first embodiment will be described as a second embodiment of the present invention.

  FIG. 4 is a perspective view showing a configuration of a sill bar 92 as a supporting means, which is a main part of the seat belt device 90 according to the present embodiment, and FIG. 5 is a side sectional view of the sill bar 92. It is shown.

  As shown in these figures, the sill bar 92 includes a base block 94. In the present embodiment, the base block 94 is formed in a rectangular parallelepiped shape whose longitudinal direction is substantially along the vehicle longitudinal direction. The base block 94 is fixed to the base portion 36 of the accommodating portion 34 by a fastening means such as a bolt, welding, or the like, substantially outside the seat 16 in the lateral direction of the vehicle.

  A pair of guide holes 96 are formed in the base block 94. These guide holes 96 have the same shape and are formed at a predetermined interval in the vehicle longitudinal direction. One end of the guide hole 96 is opened on the upper surface of the base block 94, and the other end is opened on the side surface of the base block 94 facing substantially the center in the left-right direction of the vehicle. Between the one end and the other end of the guide hole 96 is curved with a predetermined curvature, and the guide hole 96 is generally arcuate.

  The sill bar 92 includes a bar body 98. The bar body 98 includes a support portion 100 that is formed in a longitudinal direction substantially along the vehicle longitudinal direction. The support portion 100 has a configuration corresponding to the support portion 70 of the sill bar 60 in the first embodiment, and is supported in a state where the longitudinal intermediate portion of the lap belt portion 30 (webbing belt 18) is in contact with the support portion 100. Passing below the portion 100 (that is, between the upper surface of the base block 94 and the support portion 100), the leading end side of the lap belt portion 30 is directed toward the anchor portion 54 (lap pretensioner 42).

  Legs 102 extend substantially downward from the vehicle from both longitudinal ends of the support portion 100. The outer diameter of the leg portion 102 is slightly smaller than the inner diameter size of the guide hole 96, and the intermediate portion in the longitudinal direction of the leg portion 102 enters the guide hole 96. Further, the leg portion 102 that has entered the guide hole 96 is curved along the guide hole 96, and the distal end side of the leg portion 102 projects from the other end of the guide hole 96 to the outside of the sill bar 92. It extends from the bar 92 substantially to the center in the left-right direction of the vehicle. Further, a spherical retaining portion 104 whose outer diameter is larger than the inner diameter of the guide hole 96 is formed at the tip of the leg portion 102.

<Operation and Effect of Second Embodiment>
When the lap portion of the occupant 76 is about to move to the front side of the vehicle by sudden deceleration of the vehicle after the operation of the lap pretensioner 42 is finished, the lap belt portion 30 is pulled by the lumbar portion of the occupant 76. When the tensile force applied to the lap belt part 30 exceeds the rigidity of the leg part 102, the support part 100 is pulled and moved by the lap belt part 30, and the leg part 102 is moved as shown in FIG. The portion of the leg portion 102 that has been positioned inside the guide hole 96 is pulled out from one end of the guide hole 96. Thus, when the leg part 102 moves, the leg part 102 is squeezed by the inner peripheral part of the guide hole 96, and the longitudinal direction of the leg part 102 is the opening direction of one end of the guide hole 96, that is, substantially upward of the vehicle. It is forcibly deformed to face.

  In this way, the leg portion 102 moves while deforming until the retaining portion 104 of the leg portion 102 abuts against the base block 94 on the other end side of the guide hole 96, so that the support portion 100 with which the lap belt portion 30 is in contact is moved. A position changes and the passage locus of the lap belt part 30 is short-circuited. Thus, the lap belt portion 30 is loosened by the amount of change in the position in contact with the lap belt portion 30, and the waist portion of the occupant 76 restrained by the lap belt portion 30 is approximately the amount of looseness of the lap belt portion 30. While being able to move to the front side of the vehicle, a part of the kinetic energy when the body of the occupant 76 inertially moves forward is absorbed by the deformation of the leg portion 102.

  As described above, also in the present embodiment, not only the shoulder belt portion 28 side of the webbing belt 18 but also the lap belt portion 30 side, the support portion 100 deforms the leg portion 102 together with the leg portion 102, thereby occupant 76. Inertia movement of the lower back is allowed, and part of the kinetic energy of the body of the occupant 76 that moves inertial can be absorbed.

  Further, since the lap belt portion 30 passes below the support portion 100 of the sill bar 92 and the front end side of the lap belt portion 30 extends below the seat 16, the same as in the first embodiment. In addition, the tip of the lap belt portion 30 can be connected to a lap pretensioner 42 disposed below the seat 16. For this reason, the effect similar to the said 1st Embodiment obtained by installing the lap pretensioner 42 under the seat 16 can also be acquired in this Embodiment.

  Further, the sill bar 92 has the same function as the torsion shaft provided in the webbing take-up device 12 in the same manner as the sill bar 60 in the first embodiment. There is no need to provide it specially, the number of parts can be substantially reduced, and the cost can be reduced.

  Further, since a sill bar 92 is provided on the outer side of the lap pretensioner 42 substantially in the lateral direction of the vehicle from the lap pretensioner 42, a function equivalent to that of the torsion shaft is added to the lap pretensioner 42. Thus, the lap pretensioner 42 can be reduced in size.

<Configuration of Third Embodiment>
Next, a modified example of the sill bar 60 in the first embodiment will be described as a third embodiment of the present invention.

  FIG. 7 is a perspective view showing a configuration of a sill bar 122 as a supporting means, which is a main part of the seat belt device 120 according to the present embodiment, and FIG. 8 is a front view of the sill bar 122. It is shown. As shown in these figures, the sill bar 122 includes a bar body 124. The bar body 124 includes a pair of support portions 126. The support portion 126 is formed in a rod shape that is curved so as to open toward the vehicle lower side with a predetermined curvature around an axis that is substantially in the vehicle left-right direction. The lower portion of the support portion 126 is The lap belt portion 30 (webbing belt 18) passes.

  An ironing portion 128 is attached to the floor portion 32 on the side of the support portion 126 substantially along the vehicle front-rear direction. A part of the ironing portion 128 is formed in a concave shape that opens toward the vehicle lower side with a predetermined curvature around an axis whose axial direction is substantially the vehicle longitudinal direction. These ironing portions 128 pass through deformed portions 130 extending from both ends of the support portion 126. The deformation portion 130 has a rod shape whose longitudinal direction is substantially along the vehicle front-rear direction. At the end of the deformable portion 130 opposite to the support portion 126, a spherical restricting portion 132 having an outer diameter dimension sufficiently larger than twice the radius of curvature of the ironing portion 128 is formed.

<Operation and Effect of Third Embodiment>
When the lap portion of the occupant 76 is about to move to the front side of the vehicle by sudden deceleration of the vehicle after the operation of the lap pretensioner 42 is finished, the lap belt portion 30 is pulled by the lumbar portion of the occupant 76. When the tensile force applied to the lap belt portion 30 exceeds the rigidity of the deformable portion 130, the support portion 126 is pulled and moved by the lap belt portion 30 as shown in FIG. Move. The rod-shaped deformable portion 130 whose longitudinal direction is substantially along the vehicle front-rear direction moves along with the support portion 126 from the support portion 126 side, and is deformed by the ironing portion 128.

  In this manner, the deformable portion 130 moves while deforming until the restricting portion 132 of the deformable portion 130 contacts the ironing portion 128, so that the position of the support portion 126 with which the lap belt portion 30 contacts changes, and the lap belt portion. The 30 trajectories are short-circuited. Thus, the lap belt portion 30 is loosened by the amount of change in the position in contact with the lap belt portion 30, and the waist portion of the occupant 76 restrained by the lap belt portion 30 is approximately the amount of looseness of the lap belt portion 30. While being able to move to the front side of the vehicle, a part of the kinetic energy when the body of the occupant 76 inertially moves forward is absorbed by the deformation of the deformation portion 130.

  As described above, also in the present embodiment, not only the shoulder belt portion 28 side of the webbing belt 18 but also the lap belt portion 30 side, the support portion 126 deforms the deformable portion 130 with the deformable portion 130, thereby occupant 76. Inertia movement of the lower back is allowed, and part of the kinetic energy of the body of the occupant 76 that moves inertial can be absorbed.

  In addition, since the lap belt portion 30 passes below the support portion 126 and the leading end side of the lap belt portion 30 extends below the seat 16, the lap belt portion is the same as in the first embodiment. The tip of 30 can be connected to a lap pretensioner 42 disposed under the seat 16. For this reason, the effect similar to the said 1st Embodiment obtained by installing the lap pretensioner 42 under the seat 16 can also be acquired in this Embodiment.

  Further, the sill bar 122 has the same function as the torsion shaft provided in the webbing take-up device 12 in the same manner as the sill bar 60 in the first embodiment. There is no need to provide it specially, the number of parts can be substantially reduced, and the cost can be reduced.

  Further, since a sill bar 122 is provided on the outer side of the lap pretensioner 42 substantially in the lateral direction of the vehicle from the lap pretensioner 42, a function equivalent to that of the torsion shaft is added to the lap pretensioner 42. Thus, the lap pretensioner 42 can be reduced in size.

<Configuration of Fourth Embodiment>
Next, a modified example of the lap pretensioner 42 in the first embodiment will be described as a fourth embodiment of the present invention.

  FIG. 10 is a plan view showing a configuration of a lap pretensioner 142 as a pretensioner of the seat belt device 140 according to the present embodiment. As shown in this figure, the lap pretensioner 142 includes a cylinder 144. The cylinder 144 has basically the same configuration as the cylinder 46 of the lap pretensioner 142 in the first embodiment, but includes a deforming portion 146 that is equivalent to the deforming portion defined in the claims and formed of metal or the like. However, the configuration is different from that of the cylinder 46.

  The deformable portion 146 includes a rod-shaped portion 148. The rod-shaped portion 148 is formed in a rod shape whose central axis is parallel to the central axis of the cylinder 144, and one end of the rod-shaped portion 148 is the end of the lap pretensioner 142 opposite to the protruding direction of the rod 52 from the lap pretensioner 142. Are connected integrally. A curved portion 150 is continuously formed from the other end of the rod-shaped portion 148. The curved portion 150 is curved around an axis whose axial direction is substantially the vehicle vertical direction. A rod-shaped portion 152 is formed continuously from the end of the curved portion 150 opposite to the rod-shaped portion 148.

  The rod-shaped portion 152 is formed in a rod shape in which the direction of the central axis is inclined with respect to the direction of the central axis of the rod-shaped portion 148. Further, an ironing portion 154 is fixed on the pedestal 44 corresponding to the curved portion 150 of the deforming portion 146. The ironing portion 154 includes a cylindrical shaft portion 156 whose axial direction is substantially along the vertical direction of the vehicle, and a guide wall 158 whose inner peripheral portion faces the shaft portion 156 along the radial direction of the shaft portion 156. .

  The center of curvature of the curved portion 150 substantially coincides with the axis of the shaft portion 156, and the guide wall 158 opens toward the shaft portion 156 so that the center of curvature substantially coincides with the axis of the shaft portion 156. To be curved. Further, the distance between the outer peripheral portion of the shaft portion 156 and the inner peripheral portion of the guide wall 158 is set to be slightly larger than the width dimension of the bending portion 150, and the bending portion 150 is formed between the shaft portion 156 and the guide wall 158. It is inserted in between.

<Operation and Effect of Fourth Embodiment>
When the lap portion of the occupant 76 attempts to move to the front side of the vehicle substantially due to sudden deceleration of the vehicle after the operation of the lap pretensioner 142 is finished, the lap belt portion 30 is pulled by the lumbar portion of the occupant 76. The tensile force applied to the lap belt portion 30 is transmitted to the cylinder 144 via the piston accommodated in the cylinder 144, and the cylinder 144 is pulled. When the tensile force exceeds the rigidity of the deforming portion 146, the cylinder 144 is pulled and moved by the lap belt portion 30 as shown in FIG. 11, and the deforming portion 146 moves along with this movement.

  As the deforming portion 146 moves, the rod-like portion 152 enters between the shaft portion 156 of the ironing portion 154 and the guide wall 158. By entering between the shaft portion 156 and the guide wall 158, the rod-shaped rod-shaped portion 152 is deformed in the same manner as the bending portion 150 by being squeezed by the outer peripheral portion of the shaft portion 156 and the inner peripheral portion of the guide wall 158 (that is, The rod-shaped portion 152 becomes the curved portion 150 by entering between the shaft portion 156 and the guide wall 158).

  Thus, the lap belt portion 30 is loosened by the amount of movement of the cylinder 144, and the waist of the occupant 76 restrained by the lap belt portion 30 can move substantially forward of the vehicle by the amount of looseness of the lap belt portion 30. At the same time, the deformation of the rod-shaped portion 152 absorbs a part of the kinetic energy when the body of the occupant 76 inertially moves forward.

  As described above, also in the present embodiment, not only the shoulder belt portion 28 side of the webbing belt 18 but also the lap belt portion 30 side is deformed so that the inertial movement of the waist portion of the occupant 76 is allowed. A part of the kinetic energy of the body of the occupant 76 that moves inertial can be absorbed.

  Further, like the lap pretensioner 42 in the first embodiment, the rod-like portion 152 is also arranged below the seat 16, so that the tip of the lap belt portion 30 is the same as in the first embodiment. Can be coupled to a wrap pretensioner 142 located below the seat 16. For this reason, the effect similar to the said 1st Embodiment obtained by installing the lap pretensioner 142 under the seat 16 can also be acquired in this Embodiment.

  In this embodiment, the sill bar 60 in the first embodiment, the sill bar 92 in the second embodiment, and the sill bar 122 in the third embodiment are further described. In the present embodiment, such sill bars 60, 92, 122, etc. may be applied, or the lap belt portion 30 may be short-circuited due to deformation or the energy may be reduced. A simple sill bar that does not have a function of absorption may be applied.

  Further, in each of the embodiments described so far, the waist portion of the occupant 76 who is about to move inertially toward the front side of the vehicle pulls the lap belt portion 30, thereby pulling the rod 52. The rod 52 is integrally provided with a piston accommodated in the cylinders 46 and 144. For this reason, when the rod 52 moves, the piston slides integrally in the cylinders 46 and 144. As the piston slides in this manner, the internal pressure of the cylinders 46 and 144 changes. In other words, the internal pressure of the cylinders 46 and 144 becomes a resistance against the piston sliding in the cylinders 46 and 144.

  Even when the rod 52 moves against the internal pressure of the cylinders 46 and 144, the lap belt portion 30 is loosened by the amount of movement of the rod 52. Therefore, the lumbar portion of the occupant 76 restrained by the lap belt portion 30 can move to the front side of the vehicle substantially by the looseness of the lap belt portion 30, and the cylinders 46 and 144 that have been the resistance to the movement of the rod 52. A part of the kinetic energy is absorbed when the body of the occupant 76 inertially moves forward in response to the internal pressure.

  That is, the rod 52 that moves against the internal pressure of the cylinders 46, 144 also has the same effect as the deformation of the sill bars 60, 92, 122 and the deformation part 146. The effect equivalent to 122 and the deformation | transformation part 146 can be acquired. Like the cylinders 46 and 144 and the rod 52, gas pressure resistance applying means for causing the lap belt portion 30 to loosen and applying resistance based on the gas pressure to the movement of the body of the occupant 76 substantially forward of the vehicle. It is also possible to intentionally provide a configuration that can be grasped as follows, and to superimpose the effect of the gas pressure resistance applying means on the effect of the deformation of the sill bars 60, 92, 122 and the deformation portion 146.

  On the other hand, the energy absorption due to the movement of the rod 52 against the internal pressure of the cylinders 46 and 144 has one aspect that it is difficult to strictly set the operation timing and the amount of energy to be absorbed. For this reason, for example, a lock mechanism is provided that restricts the movement of the piston and the rod 52 in the direction opposite to the moving direction of the piston when the lap pretensioners 42 and 142 are activated and the internal pressure of the cylinders 46 and 144 is increased. A configuration may be employed in which energy absorption due to movement of the rod 52 against the internal pressure of the cylinders 46 and 144 is intentionally excluded. With such a configuration, when the vehicle suddenly decelerates, the timing for allowing the inertial movement of the body of the occupant 76 to the front side of the vehicle and the setting of the energy absorption amount are basically set to the sill bars 60, 122 and the deformation. It can be set relatively easily based on the mechanical strength of the portion 146.

1 is a perspective view showing an overall configuration of a seat belt device according to a first embodiment of the present invention. It is a perspective view corresponding to FIG. 1 in the state in which the support means was deformed. It is the figure which looked at the seatbelt apparatus which concerns on the 1st Embodiment of this invention from the substantially vehicle back side. It is the perspective view which expanded the principal part of the seatbelt apparatus which concerns on the 2nd Embodiment of this invention. It is side surface sectional drawing to which the principal part of the seatbelt apparatus which concerns on the 2nd Embodiment of this invention was expanded. It is side surface sectional drawing corresponding to FIG. 5 which shows the state which the support means deform | transformed. It is the perspective view which expanded the principal part of the seatbelt apparatus which concerns on the 3rd Embodiment of this invention. It is front sectional drawing to which the principal part of the seatbelt apparatus which concerns on the 3rd Embodiment of this invention was expanded. It is side surface sectional drawing corresponding to FIG. 6 which shows the state which the support means deform | transformed. It is the top view to which the principal part of the seatbelt apparatus which concerns on the 4th Embodiment of this invention was expanded. It is a top view corresponding to FIG. 10 which shows the state which the deformation | transformation part deform | transformed.

Explanation of symbols

10 Seat belt device 12 Webbing take-up device (storage means)
16 seat 18 webbing belt 28 shoulder belt part 30 lap belt part 32 floor part 42 lap pretensioner (pretensioner)
60 Sil Bar (support means)
90 seat belt device 92 sill bar (supporting means)
120 seat belt device 122 sill bar (supporting means)
140 seat belt device 142 lap pretensioner (pretensioner)
146 Deformation part

Claims (4)

  Among the long belt-shaped webbing belts, the longitudinal direction intermediate part of the lap belt part that restrains the waist of the vehicle occupant's body is supported, and the direction of the other lap belt part is changed with respect to one side with the support position as a boundary. A seat belt device comprising support means for changing a support position of the lap belt portion while being deformed by receiving a tension of a predetermined magnitude or more acting on the lap belt portion, and short-circuiting a passing locus of the lap belt portion.   A pretensioner for holding the tip of the lap belt portion whose direction is changed at the support position and pulling the tip of the lap belt portion in a sudden deceleration state of the vehicle to increase the tension of the lap belt portion; The seat belt device according to claim 1. A webbing belt which is formed in a long belt shape as a whole, and a predetermined range on the tip side from the longitudinal intermediate portion is a lap belt portion, and the lap belt portion restrains a waist of a vehicle occupant in a mounted state;
Storage means for retracting and storing the webbing belt from the base end side;
A pretensioner that is connected to the tip side of the lap belt portion and forcibly pulls the lap belt portion in a state of rapid deceleration of the vehicle;
A deforming portion that is provided in the pretensioner and is deformed by a tension greater than or equal to a predetermined size applied to the lap belt portion, and allowing the pretensioner to move with the lap belt portion;
A seat belt device comprising:   The seat belt device according to any one of claims 1 to 3, wherein a tip end of the lap belt portion whose direction is changed by the support means is held below the seat.

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