JP2010058773A - Webbing winding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively absorb kinetic energy of an occupant with simple structure. <P>SOLUTION: In the webbing winding device 10, an energy absorbing plate 26 is wound around a shaft 22 while being drawing-deformed when a force limiter mechanism 24 is operated to absorb the kinetic energy of the occupant. The energy absorbing plate 26 can be wound around the shaft 22 at least once, and a stroke of absorbing the kinetic energy of the occupant is elongated. When a rotation amount in a drawing direction of a spool 18 with respect to the shaft 22 becomes large, the absorption amount of kinetic energy of the occupant is increased. Therefore, the kinetic energy of the occupant is effectively absorbed. Since the force limiter mechanism 24 has structure in which an energy absorbing plate 26 is stretched between the spool 18 and the shaft 22, the structure is simplified. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a webbing take-up device that takes up a webbing that is worn by an occupant of a vehicle.

  In some webbing take-up devices, a bobbin and a locking plate are integrally rotated by holding a lock piece in a guide portion formed at a facing portion between the bobbin and the locking plate on which the webbing is taken up. (For example, refer to Patent Document 1).

  In this webbing take-up device, in the event of a vehicle emergency, the rotation of the locking plate in the pull-out direction is restricted, so that the bobbin is rotated in the pull-out direction with respect to the locking plate by the load acting on the webbing from the occupant. The piece is moved while deforming the guide part. Thereby, the kinetic energy of the passenger is absorbed.

  Further, in this webbing take-up device, the bobbin can be rotated one or more times in the pull-out direction with respect to the locking plate, and the kinetic energy absorption stroke of the occupant is lengthened. Further, when the amount of rotation of the bobbin with respect to the locking plate in the pull-out direction changes, the load by which the lock piece deforms the guide portion changes, and the amount of kinetic energy absorbed by the occupant changes. Thereby, a passenger | crew's kinetic energy can be absorbed effectively.

However, in this webbing take-up device, the configuration for absorbing the kinetic energy of the occupant requires not only the lock piece but also the guide portion, and is complicated.
JP-A-9-286302

  In view of the above facts, an object of the present invention is to provide a webbing take-up device that can effectively absorb the kinetic energy of an occupant with a simple configuration.

  The webbing take-up device according to claim 1 is formed into a cylindrical shape, and a webbing mounted on a vehicle occupant can be taken up around an outer periphery, and the webbing is taken up by being rotated in the take-up direction. A winding member that is rotated in the pulling-out direction when the webbing is pulled out, a rotating shaft that is disposed in the winding member, and restricting rotation of the rotating shaft in the pulling-out direction in the event of a vehicle emergency The regulating means is formed in a plate shape, is spanned between the winding member and the rotating shaft, and the winding member and the rotating shaft are rotated together, and the regulating means is mounted on the rotating shaft. The winding member is wound around the rotating shaft while being deformed by being rotated in the pulling direction with respect to the rotating shaft by a load acting on the webbing from an occupant when the rotation in the pulling direction is restricted, and On the axis of rotation Together it is enabled wound in a state that does not overlap or peripheral, and a, a deformable member deforming load and the amount of rotation is changed to change in the pull-out direction relative to the axis of rotation of the winding member.

  The webbing take-up device according to a second aspect is the webbing take-up device according to the first aspect, wherein the deformable member is curved in a spiral shape along the longitudinal direction.

  The webbing take-up device according to claim 3 is the webbing take-up device according to claim 1 or 2, wherein the amount of rotation of the take-up member in the pull-out direction with respect to the rotation shaft increases. Deformation load increases.

  In the webbing take-up device according to claim 1, the take-up member is formed into a cylindrical shape, and the webbing attached to the vehicle occupant can be taken up around the outer periphery, and the take-up member is wound in the take-up direction. When the webbing is wound around the winding member, the winding member is rotated in the pulling-out direction.

  Furthermore, a rotating shaft is disposed in the winding member, a plate-shaped deformation member is bridged between the winding member and the rotating shaft, and the winding member and the rotating shaft are rotated together. The

  When the restricting means restricts the rotation of the rotating shaft in the pull-out direction in the event of an emergency of the vehicle, the winding member is rotated in the pull-out direction with respect to the rotating shaft by a load acting on the webbing from the occupant. Is wound around the rotating shaft while being deformed. Thereby, the kinetic energy of the passenger is absorbed.

  Here, the deformable member can be wound around the rotating shaft one or more times, and the kinetic energy absorption stroke of the occupant is lengthened. Furthermore, when the amount of rotation of the take-up member in the pull-out direction with respect to the rotation axis changes, the deformation load of the deformation member changes, and the amount of kinetic energy absorbed by the occupant changes. Thereby, a passenger | crew's kinetic energy can be absorbed effectively.

  Furthermore, the structure which absorbs a passenger | crew's kinetic energy is made into the structure which spanned the deformation member between the winding member and the rotating shaft. Thereby, a structure can be simplified.

  Further, the deformable member can be wound in a state where it does not overlap the rotating shaft. For this reason, the outer diameter of the deformable member wound around the rotating shaft can be reduced, the inner diameter of the winding member and hence the outer diameter of the winding member can be reduced, and the winding member can be reduced in size.

  In the webbing take-up device according to the second aspect, the deformable member is spirally curved along the longitudinal direction. For this reason, the deformable member can be wound in a state in which it does not overlap with the rotating shaft more than one turn.

  In the webbing take-up device according to the third aspect, when the amount of rotation of the take-up member in the pull-out direction with respect to the rotation shaft increases, the deformation load of the deformable member increases. For this reason, other occupant protection devices such as an airbag device can be dispensed with.

[First Embodiment]
FIG. 1 shows a cross-sectional view of a webbing take-up device 10 according to a first embodiment of the present invention viewed from the outside in the vehicle width direction, and FIG. 2 shows the main parts of the webbing take-up device 10. The section is shown in a sectional view (sectional view taken along line 2-2 in FIG. 1) as seen from one side in the vehicle longitudinal direction. In the drawings, the inner side in the vehicle width direction is indicated by an arrow IN, one side in the vehicle longitudinal direction is indicated by an arrow LO, and the upper side is indicated by an arrow UP.

  As shown in FIG. 1, a webbing retractor 10 according to the present embodiment is provided with a frame 12 having a U-shaped cross section, and the frame 12 includes a back plate 12A on the inner side in the vehicle width direction and a vehicle. A leg plate 12B on the other side in the front-rear direction and a leg plate 12C on the one side in the vehicle front-rear direction are provided. The frame 12 is fixed to the vehicle at the back plate 12A, whereby the webbing take-up device 10 is installed in the vehicle.

  A circular support hole 14 is formed through the leg plate 12B of the frame 12, and a substantially circular ratchet hole 16 is formed through the leg plate 12C of the frame 12. The support hole 14 and the ratchet hole 16 face each other in the vehicle front-rear direction and are arranged coaxially. Ratchet teeth 16A (inner teeth) are formed on the entire outer periphery of the ratchet hole 16, and the ratchet holes 16 (including the ratchet teeth 16A) constitute the lock mechanism 38 described below.

  Between the leg plate 12B (support hole 14) and the leg plate 12C (ratchet hole 16) of the frame 12, a substantially cylindrical spool 18 as a winding member is rotatably disposed. A long belt-like webbing 20 (belt) is wound around the outer periphery of the spool 18 from the base end side, and the webbing 20 extends upward from the frame 12 and is seated on a vehicle seat (not shown). To be worn by the crew. Further, when the spool 18 is rotated in the winding direction (the direction of arrow A in FIG. 2 and the like), the webbing 20 is wound around the spool 18 and the webbing 20 is pulled out from the spool 18, so that the spool 18 is It is rotated in the drawing direction (the direction of arrow B in FIG. 2 etc.).

  A shaft 22 as a rotation shaft is coaxially inserted in the spool 18. A rotating portion 22A is formed at one end of the shaft 22 on the leg plate 12B side, and the rotating portion 22A is fitted into one end of the spool 18 on the leg plate 12B side so as to be relatively rotatable. An insertion portion 22B is formed in the vicinity of the other end of the shaft 22 on the leg plate 12C side, and a columnar shaft main body 22C is formed between the rotation portion 22A of the shaft 22 and the insertion portion 22B.

  In the spool 18, an energy absorbing plate 26 as a deforming member (energy absorbing member) constituting the force limiter mechanism 24 is provided outside the shaft main body 22 </ b> C of the shaft 22.

  As shown in detail in FIGS. 2 and 3, a rectangular plate-like fixing plate 28 as a fixing portion is provided at the center of the energy absorbing plate 26. The fixing plate 28 is the center in the axial direction of the shaft body 22C. It is inserted and fixed. Thereby, the energy absorption plate 26 is fixed to the shaft 22.

  One end 30 </ b> A of a long rectangular plate-shaped first plate 30 as a first deforming portion is connected to the base end of the fixed plate 28. An ironing portion 32 is formed in the vicinity of one end 30 </ b> A of the first plate 30, and the first plate 30 is bent (bent) at the ironing portion 32. The first plate 30 extends toward the winding direction as it goes from the ironing portion 32 toward the one end 30A and toward the other end 30B from the ironing portion 32, and a portion other than the ironing portion 32 of the first plate 30 is a shaft. It is bent to the same side as the bending direction of the outer periphery of the main body 22C.

  One end 34 </ b> A of a pair of long rectangular plate-like second plates 34 serving as a second deforming portion is connected to the other end 30 </ b> B of the first plate 30. The second plate 34 is spirally curved along the longitudinal direction, and the second plate 34 extends toward the winding direction and the axial end of the shaft 22 from the one end 34A toward the other end 34B. At the same time, it is curved along the inner peripheral surface 18A of the spool 18 and is in contact with the inner peripheral surface 18A of the spool 18.

  The thickness of the first plate 30 and the pair of second plates 34 is the same, and the width of the first plate 30 in the axial direction of the shaft 22 is the sum of the widths of the pair of second plates 34 in the axial direction of the shaft 22. Is made smaller (about ½). Thereby, the deformation load (the load for deformation) of the first plate 30 is made smaller (about ½) than the total deformation load of the pair of second plates 34.

  The other ends 34 </ b> B of the pair of second plates 34 are respectively fixed to columnar stoppers 36 as fixing members, and the stoppers 36 are fixed to the inner peripheral surface 18 </ b> A of the spool 18. As a result, the energy absorbing plate 26 is fixed to the spool 18, and the spool 18, the shaft 22, and the energy absorbing plate 26 can be rotated together by connecting the spool 18 and the shaft 22 via the energy absorbing plate 26. Has been.

  On the leg plate 12C side of the spool 18, a lock mechanism 38 as a restricting means is provided. The lock mechanism 38 is provided with a base lock 40 as a rotating member. The base lock 40 is disposed coaxially with the spool 18, and a portion on the spool 18 side is the other end of the spool 18 on the leg plate 12 </ b> C side. It is fitted inside so as to be relatively rotatable. The shaft 22 is penetrated through the base lock 40, and a fitting portion 22B of the shaft 22 is connected (inserted) to the portion of the base lock 40 on the spool 18 side so as to be integrally rotatable. Thereby, the base lock 40 can rotate integrally with the shaft 22.

  A portion of the base lock 40 opposite to the spool 18 is disposed in the ratchet hole 16 of the leg plate 12C. A lock plate 42 as a restricting member is slidably held at a portion of the base lock 40 opposite to the spool 18, and a lock tooth 42 </ b> A is formed at one end of the lock plate 42.

  The lock mechanism 38 is provided with a sensor mechanism 44 as detection means, and the sensor mechanism 44 is disposed outside the leg plate 12 </ b> C of the frame 12. The sensor mechanism 44 is used for webbing 20 when the vehicle is emergency (especially when the vehicle is suddenly decelerated, when the vehicle acceleration (especially deceleration acceleration) exceeds a predetermined acceleration) and when the occupant's moving force (especially inertial force). Is pulled and the spool 18 is rotated in the pull-out direction at an acceleration equal to or higher than a specific acceleration). When the sensor mechanism 44 detects an emergency of the vehicle, as shown in FIG. 4, the sensor mechanism 44 slides the lock plate 42 with respect to the base lock 40, so that the lock teeth 42 </ b> A of the lock plate 42 are in the ratchet holes 16. It meshes with the outer ratchet teeth 16A. This restricts (locks) the rotation of the base lock 40 in the pull-out direction.

  Next, the operation of the present embodiment will be described.

  In the webbing retractor 10 having the above configuration, in the emergency of the vehicle, in the lock mechanism 38, the sensor mechanism 44 slides the lock plate 42 with respect to the base lock 40, so that the lock teeth 42A of the lock plate 42 are moved to the frame 12 ( The base plate 40 is engaged with the ratchet teeth 16A on the outer periphery of the ratchet hole 16 of the leg plate 12C), and the rotation of the base lock 40 in the pull-out direction is restricted. Thereby, the rotation of the shaft 22 in the pull-out direction is restricted, and the rotation of the energy absorbing plate 26 and the spool 18 in the pull-out direction is limited. For this reason, pulling out the webbing 20 from the spool 18 is restricted, and the occupant is restrained by the webbing 20.

  In this way, in a state where the rotation of the shaft 22 in the pulling-out direction is restricted and the pulling-out of the webbing 20 from the spool 18 is restricted, the webbing 20 is caused by the occupant's moving force (inertia force at the time of sudden deceleration of the vehicle). Is pulled, the rotational force in the pulling direction with respect to the shaft 22 acts from the webbing 20 to the spool 18. Further, when the force limiter mechanism 24 is operated and the energy absorbing plate 26 is deformed by the rotational force in the pulling direction from the webbing 20 to the spool 18 with respect to the shaft 22, the rotation of the spool 18 in the pulling direction with respect to the shaft 22 is performed. Permissible. As a result, the webbing 20 is allowed to be pulled out from the spool 18, and the kinetic energy of the occupant is absorbed.

  When the force limiter mechanism 24 is operated, the stoppers 36 are respectively provided on the other ends 34B of the pair of second plates 34 of the energy absorbing plate 26 by the rotational force in the pulling direction of the shaft 22 from the webbing 20 to the spool 18. Rotational force in the pull-out direction is applied. In the energy absorbing plate 26, the deformation load of the first plate 30 is made smaller than the total deformation load of the pair of second plates 34.

  For this reason, when the energy absorbing plate 26 is deformed as shown in the two-dot chain line of FIG. 2 and FIG. 4, first, the first plate 30 of the energy absorbing plate 26 is being deformed by squeezing (of the squeezing portion 32). The first plate 30 is wound around the shaft 22 (the shaft main body 22C) while the first plate 30 is displaced from the one end 30A side to the other end 30B side. Thereafter, the pair of second plates 34 of the energy absorbing plate 26 is deformed by ironing (the position of the ironing portion 32 is displaced from the one end 34A to the other end 34B side) while the shaft 22 (shaft Wound around body 22C).

  Here, the energy absorbing plate 26 is provided with a pair of second plates 34 as well as the first plate 30. For this reason, the energy absorbing plate 26 can be wound around the shaft 22 one or more times, and the spool 18 can be rotated in the pull-out direction with respect to the shaft 22 by one or more times (especially two or more times). The absorption stroke of kinetic energy is lengthened.

  Moreover, as described above, in the energy absorbing plate 26, the deformation load of the first plate 30 is made smaller than the total deformation load of the pair of second plates 34. For this reason, as shown in FIG. 5, the deformation load of the energy absorbing plate 26 and the amount of kinetic energy absorbed by the occupant are as follows when the first plate 30 is wound around the shaft 22 while being squeezed and deformed. Yes, when the pair of second plates 34 are wound around the shaft 22 while being deformed by squeezing (the range of T2 in FIG. 5). growing. As a result, when the amount of rotation of the spool 18 in the pull-out direction with respect to the shaft 22 and thus the amount of pull-out of the webbing 20 from the spool 18 increases, the amount of kinetic energy absorbed by the occupant increases.

  In this way, the kinetic energy absorption stroke of the occupant increases as the absorption stroke of the kinetic energy of the occupant becomes longer and the amount of withdrawal of the webbing 20 from the spool 18 increases. For this reason, a passenger | crew's kinetic energy can be absorbed effectively.

  Moreover, as described above, when the amount of webbing 20 pulled out from the spool 18 increases, the amount of kinetic energy absorbed by the occupant increases. For this reason, other occupant protection devices such as an airbag device can be eliminated, and the webbing retractor 10 can be applied to a vehicle seat (for example, a rear seat) to which the other occupant protection devices are not applied.

  In the energy absorbing plate 26, the second plate 34 is provided on both sides of the first plate 30 in the axial direction of the shaft 22. For this reason, the deformation load of the second plate 34 can be applied to the both sides in the axial direction of the spool 18 without deviation, and the kinetic energy of the occupant can be absorbed on both sides in the axial direction of the spool 18 without deviation.

  Furthermore, the force limiter mechanism 24 is configured such that an energy absorbing plate 26 is bridged between the spool 18 and the shaft 22. Thereby, the structure of the force limiter mechanism 24 can be simplified.

  In addition, the second plate 34 of the energy absorbing plate 26 is spirally curved along the longitudinal direction so that the first plate 30 and the second plate 34 of the energy absorbing plate 26 can be wound so as not to overlap the shaft 22. (See FIG. 4). For this reason, the outer diameter of the energy absorbing plate 26 wound around the shaft 22 can be reduced, the inner diameter of the spool 18 and hence the outer diameter of the spool 18 can be reduced, and the spool 18 can be reduced in size.

  Further, the second plate 34 of the energy absorbing plate 26 is spirally curved along the longitudinal direction, so that the second plate 34 can be wound around the shaft 22 without a gap in the axial direction of the shaft 22 (see FIG. 4). For this reason, the axial length of the shaft 22 and thus the axial length of the spool 18 can be shortened, and the spool 18 can be downsized.

[Second Embodiment]
FIG. 6 is a cross-sectional view (a cross-sectional view taken along line 2-2 in FIG. 1) of the main part of the webbing retractor 50 according to the second embodiment of the present invention viewed from one side in the vehicle front-rear direction. Has been.

  The webbing take-up device 50 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  6 and 7, in the webbing take-up device 50 according to the present embodiment, in the energy absorbing plate 26, the other end 30B of the first plate 30 and one end 34A of the pair of second plates 34 are connected. It is connected by a long rectangular plate-like connecting plate 52 as a part. The connecting plate 52 is arranged in parallel to the axial direction of the shaft 22, and the other end 30 </ b> B of the first plate 30 is connected to the center of the connecting plate 52 in the longitudinal direction, and the connecting plate 52 is connected to the longitudinal end of the connecting plate 52. One end 34A of the two plates 34 is connected.

  Here, when the force limiter mechanism 24 is operated and the energy absorbing plate 26 is deformed as shown by a two-dot chain line in FIG. 6, first, the first plate 30 of the energy absorbing plate 26 is deformed by ironing. The coil 22 is wound around the shaft 22 (the shaft body 22C) while the position of the ironing portion 32 is displaced from the first plate 30 to the other end 30B side. Thereafter, the connecting plate 52 of the energy absorbing plate 26 is instantaneously rotated without being squeezed and wound around the shaft 22 (shaft body 22C). Thereafter, the pair of second plates 34 of the energy absorbing plate 26 is deformed by ironing (the position of the ironing portion 32 is displaced from the one end 34A to the other end 34B side) while the shaft 22 (shaft Wound around body 22C).

  For this reason, also in this embodiment, the same operation and effect as the first embodiment can be obtained.

  In the first and second embodiments, the energy absorbing plate 26 is provided with a pair of second plates 34. However, the energy absorbing plate 26 is provided with one second plate 34. It is good also as a structure.

  In the first and second embodiments, when the amount of rotation of the spool 18 in the pull-out direction with respect to the shaft 22 increases, the deformation load of the energy absorbing plate 26 increases and the kinetic energy of the occupant is absorbed. However, when the amount of rotation of the spool 18 in the pull-out direction with respect to the shaft 22 is increased, the deformation load of the energy absorbing plate 26 is reduced and the amount of absorption of the kinetic energy of the occupant may be reduced.

It is sectional drawing seen from the vehicle width direction outer side which shows the webbing winding device concerning a 1st embodiment of the present invention. FIG. 2 is a cross-sectional view (a cross-sectional view taken along line 2-2 in FIG. 1) showing a main part of the webbing retractor according to the first embodiment of the present invention as seen from one side in the vehicle front-rear direction. It is the perspective view seen from the vehicle front-back direction one side and the vehicle width direction inner side which shows the energy absorption plate in the webbing winding device concerning a 1st embodiment of the present invention. It is sectional drawing seen from the vehicle width direction outer side at the time of the action | operation of the force limiter mechanism in the webbing winding device which concerns on the 1st Embodiment of this invention. It is a graph which shows the relationship between the rotation amount to the drawing-out direction with respect to the shaft of the spool in the webbing winding device concerning a 1st embodiment of the present invention, and the amount of absorption of the kinetic energy of a crew member. It is sectional drawing (the 2-2 line position sectional view of Drawing 1) seen from the vehicle longitudinal direction one side which shows the principal part of the webbing winding device concerning a 2nd embodiment of the present invention. It is the perspective view seen from the vehicle front-back direction one side and the vehicle width direction inner side which shows the energy absorption plate in the webbing winding apparatus which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

10 Webbing take-up device 18 Spool (winding member)
20 Webbing 22 Shaft (Rotating shaft)
26 Energy absorption plate (deformable member)
38 Locking mechanism (regulation means)
50 Webbing take-up device

Claims (3)

The webbing that is mounted on the vehicle occupant can be wound around the outer periphery, and the webbing is wound up by being rotated in the winding direction, and the webbing is pulled out to be pulled out. A winding member rotated to
A rotating shaft disposed in the winding member;
Restriction means for restricting rotation of the rotary shaft in the pull-out direction in the event of an emergency of the vehicle;
It is plate-shaped and is bridged between the winding member and the rotating shaft so that the winding member and the rotating shaft are rotated together, and the restricting means is disposed in the pulling direction of the rotating shaft. The winding member is wound around the rotating shaft while being deformed by being rotated in the pull-out direction with respect to the rotating shaft by a load acting on the webbing from an occupant when the rotation is restricted. A deformable member that is capable of being wound in a state where it does not overlap more than the circumference and whose deformation load changes when the amount of rotation of the winding member in the pull-out direction with respect to the rotation shaft changes,
A webbing take-up device comprising:   The webbing take-up device according to claim 1, wherein the deformable member is spirally curved along the longitudinal direction.   3. The webbing take-up device according to claim 1, wherein when the amount of rotation of the take-up member in the pull-out direction with respect to the rotation shaft increases, the deformation load of the deformable member increases.

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