JP2017218092A - Webbing winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a webbing winding device that can suppress a site which a tip in a shaft direction of a moving member is contacted with from being highly strengthened.SOLUTION: In a webbing winding device 10, when a moving member 64 is moved toward a tip in a shaft direction and then the tip in the shaft direction of the moving member 64 is contacted with a part closer to inside in a vehicle width direction than a second corner part 82, in a side wall 72 of a cover plate 50, the moving member 64 is suppressed from moving toward the tip in the shaft direction. Under this condition, when a base end side in the shaft direction of the moving member 64 is moved toward the tip in the shaft direction, a part 64A disengaged from the rotating member 28 of the moving member 64 is deformed. Some of impact caused when the tip in the shaft direction of the moving member 64 is contacted with the side wall 72 of the cover plate 50 is given to deform the part 64A disengaged from the rotating member 28 of the moving member 64 and then absorbed there, which can suppress the cover plate 50 from being highly strengthened.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a webbing take-up device in which a spool is rotated in a take-up direction by moving a moving member toward an axial front end side.

  In the event of a vehicle emergency, the moving member moved to the front end in the axial direction is engaged with the rotating member, and when the rotating member is rotated, the spool is rotated in the winding direction and the webbing is wound around the spool. There is a taking device (see Patent Document 1 below as an example).

  In this type of webbing take-up device, the movement of the moving member toward the distal end side in the axial direction is restricted by the axial tip of the moving member engaged with the rotating member coming into contact with a contact portion such as a stopper. . Here, when the movement of the moving member is restricted, a large load is applied from the moving member to the contact portion, so that the mechanical strength of the contact portion is increased.

Pamphlet of International Publication No. 2016/021422

  In view of the above fact, an object of the present invention is to obtain a webbing take-up device that can suppress an increase in strength of a portion where an axial tip of a moving member comes into contact.

  The webbing take-up device according to claim 1 is a spool in which the webbing of the seat belt device is taken up by being rotated in the take-up direction, and rotation in which the spool is rotated in the take-up direction by rotation to one side. In the state where the member is moved to the front end side in the axial direction in an emergency of the vehicle, the shaft is engaged with the rotary member to rotate the rotary member to one side and the movement to the front end side in the axial direction is suppressed. A movable member that can be deformed by receiving a load from the base end side, and a suppressor that suppresses the movement of the movable member toward the distal end side in the axial direction by contacting the distal end portion in the axial direction of the movable member; It is equipped with.

  According to the webbing take-up device of the first aspect, the movement of the moving member toward the distal end side in the axial direction is suppressed by bringing the axial distal end portion of the moving member into contact with the suppressing means. When the moving member receives a load from the axial base end side in a state in which the movement of the moving member to the distal end side in the axial direction is suppressed, the moving member is deformed, and the moving member is deformed by the deformation of the moving member. The load applied to the base end side in the axial direction is absorbed. As a result, the impact imparted to the contact portion of the restraining means with the tip end in the axial direction of the moving member can be mitigated, and the strengthening of the restraining means can be restrained.

  The webbing take-up device according to claim 2 is the webbing take-up device according to claim 1, wherein the restraining means intersects the axial direction of the moving member in a state in which movement of the moving member is restrained. A space is formed between the movable member and the moving member.

  According to the webbing take-up device of the second aspect, in a state where the movement of the moving member toward the distal end side in the axial direction is suppressed by the suppressing means, the moving means moves with the suppressing means on the side intersecting the axial direction of the moving member. A space is formed between the members. For this reason, the moving member can be deformed so as to reduce the space between the suppressing means and the moving member in a state where the movement of the moving member toward the distal end in the axial direction is suppressed by the suppressing means.

  The webbing take-up device according to claim 3 is the webbing take-up device according to claim 2, wherein the restraining means is moved to the front end side in the axial direction while the moving member is in contact with the webbing take-up device. Provided on the opposite side of the bending portion where the moving member is bent and the center of curvature of the bending at the portion of the moving member that has passed through the bending portion, and the movement of the moving member is suppressed by the suppressing means. And a wall portion in which a space is formed between the movable member and the movable member.

  According to the webbing take-up device of the third aspect, the moving member is bent by being moved toward the distal end in the axial direction while being in contact with the curved portion of the suppressing means. Further, a wall portion of the suppressing means is provided on the side opposite to the center of curvature of the bending in the portion of the moving member that has passed through the curved portion, and in a state where the movement of the moving member is suppressed by the suppressing means, A space is formed between the movable member. For this reason, the moving member can be deformed so as to reduce the space between the wall portion of the suppressing means and the moving member in a state where the movement of the moving member toward the distal end in the axial direction is suppressed by the suppressing means.

  The webbing take-up device according to a fourth aspect is the webbing take-up device according to the third aspect, wherein the wall portion is curved on the moving member side in which the movement to the tip side in the axial direction is suppressed by the suppressing means. A corner portion that is bent at the center and has a radius of curvature equal to or less than the radius of curvature of the curved portion is provided.

  According to the webbing take-up device of the fourth aspect, the wall portion of the suppressing means includes the corner portion. The corner portion is bent with the moving member side whose movement toward the tip end side in the axial direction is suppressed by the suppressing means as the center of curvature, and the radius of curvature of the corner portion is equal to or less than the radius of curvature of the curved portion. For this reason, for example, even if the axially intermediate portion of the moving member whose movement toward the distal end in the axial direction is restrained by the restraining means comes into contact with the wall portion on the side of the corner portion, A space can be formed between the contact portion and the corner portion. Accordingly, the moving member can be deformed so as to reduce the space between the contact portion with the wall portion of the moving member and the corner portion.

  The webbing take-up device according to a fifth aspect is the webbing take-up device according to any one of the first to fourth aspects, wherein the moving member deformed in a state in which movement by the suppressing means is suppressed is applied. Limiting means for limiting the movement of the moving member toward the distal end side in the axial direction by contacting the moving member is provided.

  According to the webbing take-up device of the fifth aspect, the moving member deformed in a state in which the movement is suppressed by the suppressing unit can be brought into contact with the limiting unit. Even if the movement member is deformed by the load and the suppression of the movement of the movement member by the suppression means is eliminated, the movement of the movement member is restricted to the axial direction tip side by contacting the restriction means. Here, even when the moving member receives a load from the proximal side in the axial direction in a state where movement of the moving member is suppressed, the load can be absorbed by the deformation of the moving member. For this reason, the increase in strength of the limiting means can be suppressed.

  The webbing take-up device according to claim 6 is the webbing take-up device according to any one of claims 1 to 5, wherein the suppressing means includes the moving member engaged with the rotating member. Accommodate.

  In the webbing take-up device according to the sixth aspect, the moving member engaged with the rotating member is accommodated in the suppressing means. Here, in this webbing take-up device, since the strength of the restraining means can be suppressed, an increase in the weight of the member for housing the moving member engaged with the rotating member can be suppressed.

  As described above, in the webbing take-up device according to the present invention, it is possible to suppress an increase in the strength of the portion where the axial tip of the moving member comes into contact.

1 is an exploded perspective view of a webbing take-up device according to an embodiment of the present invention. It is a perspective view which shows the inner side of a cover plate. It is sectional drawing which looked at the cover plate, the cylinder, the moving member, and the rotating member from the vehicle front side. It is sectional drawing corresponding to FIG. 3 which shows the state by which the axial direction front-end | tip of the moving member was contact | abutted to the 2nd engagement tooth of the rotation member. It is sectional drawing corresponding to FIG. 4 which shows the state which the 1st engagement tooth of the rotation member and the 2nd engagement tooth pierced to the moving member. FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing a state in which the tip end portion in the axial direction of the moving member is moved outward in the vehicle width direction from the rotating member. It is sectional drawing corresponding to FIG. 6 which shows the state which the axial direction front-end | tip of the moving member was contact | abutted to the vehicle upper side part of the side wall of a cover plate. It is sectional drawing corresponding to FIG. 7 which shows the state by which the axial direction front-end | tip of the moving member was contact | abutted to the movement restriction | limiting part of the 2nd rivet.

  Next, each embodiment of the present invention will be described with reference to FIGS. In each figure, the arrow FR indicates the front side of the vehicle to which the webbing retractor 10 is applied, the arrow OUT indicates the vehicle width direction outer side, and the arrow UP indicates the vehicle upper side.

<Configuration of the present embodiment>
As shown in FIG. 1, the webbing take-up device 10 according to the present embodiment includes a frame 12. The frame 12 is fixed to a vehicle lower portion of a center pillar (not shown) as a vehicle body. The frame 12 includes leg plates 14 and 16, and the leg plate 14 and the leg plate 16 are opposed to each other substantially in the vehicle front-rear direction.

  Further, the webbing take-up device 10 includes a spool 18. The spool 18 is formed in a substantially cylindrical shape, and is disposed between the leg plate 14 and the leg plate 16 of the frame 12. The center axis direction of the spool 18 is along the opposing direction of the leg plate 14 and the leg plate 16 (that is, substantially the vehicle front-rear direction), and the spool 18 is rotatable around the center axis.

  The longitudinal end of the elongate webbing 20 is locked to the spool 18, and when the spool 18 is rotated in the winding direction (the direction of arrow A in FIG. 1 and the like), the webbing 20 is moved in the longitudinal direction. It is wound on the spool 18 from the base end side. The front end side of the webbing 20 in the longitudinal direction extends from the spool 18 toward the vehicle upper side, and the front end side of the webbing 20 in the longitudinal direction is formed on a through anchor (not shown) supported on the center pillar on the vehicle upper side of the frame 12. It is turned back to the vehicle lower side through the slit hole.

  Furthermore, the longitudinal direction front-end | tip part of the webbing 20 is latched by the anchor plate (illustration omitted). The anchor plate is formed of a metal plate material such as iron, and is fixed to a vehicle floor (not shown) or a skeleton member of a sheet (not shown) corresponding to the webbing take-up device 10.

  The vehicle seat belt device to which the webbing retractor 10 is applied includes a buckle device (not shown). The buckle device is provided on the inner side in the vehicle width direction of the seat to which the webbing take-up device 10 is applied. In a state where the webbing 20 is wound around the body of the occupant seated on the seat, the tongue (not shown) provided on the webbing 20 is engaged with the buckle device, so that the webbing 20 is mounted on the body of the occupant. .

  On the other hand, on the vehicle rear side of the spool 18, a shaft portion (not shown) is provided integrally with the spool 18 on the same axis as the spool 18, and this shaft portion is a hole formed in the leg plate 14 of the frame 12. It extends to the vehicle rear side of the frame 12 (not shown).

  As shown in FIG. 1, a spring housing 22 is provided on the vehicle rear side of the leg plate 14 of the frame 12. Inside the spring housing 22, spool urging means (not shown) such as a mainspring spring is provided. The spool urging means is directly or indirectly engaged with the spool 18 via the shaft portion, and the spool 18 is urged in the winding direction (direction of arrow A in FIG. 1) by the urging force of the spool urging means. It is energized.

  Further, the webbing take-up device 10 includes a torsion bar 24 that constitutes a force limiter mechanism. The torsion bar 24 is formed in a bar shape that is substantially long in the vehicle longitudinal direction. The vehicle rear side portion of the torsion bar 24 is disposed inside the spool 18 and is connected to the spool 18 in a state where relative rotation with respect to the spool 18 is restricted. On the other hand, the vehicle front side portion of the torsion bar 24 extends to the outside of the frame 12 (vehicle front side) through a hole formed in the leg plate 16 of the frame 12.

  A rotation member 28 of the pretensioner 26 is provided on the vehicle front side of the leg plate 16 of the frame 12. The rotating member 28 includes a first rotating unit 30. The first rotating portion 30 of the rotating member 28 is disposed coaxially with the spool 18, and the vehicle front side portion of the torsion bar 24 is connected to the first rotating portion 30 of the rotating member 28. For this reason, the rotation of the rotating member 28 relative to the front portion of the torsion bar 24 is restricted, and thus the rotation of the rotating member 28 is indirectly restricted relative to the spool 18 via the torsion bar 24.

  The first rotating part 30 of the rotating member 28 includes a first flange 32. The first flange 32 has a disk shape, and a plurality of first engagement teeth 34 are disposed on the vehicle front side of the first flange 32. The first engagement teeth 34 are formed around the central axis of the first flange 32 at a predetermined interval, and the vehicle rear side end of the first engagement teeth 34 is integrated with the first flange 32. It is connected. The dimension of the first engaging tooth 34 of the first rotating portion 30 of the rotating member 28 along the rotating circumferential direction of the rotating member 28 is shortened toward the radially outer side of the rotating member 28.

  Further, a second rotating part 36 that constitutes the rotating member 28 together with the first rotating part 30 is provided on the vehicle front side of the first rotating part 30 of the rotating member 28. The second rotating part 36 includes a second flange 38. The second flange 38 has a disk shape, and a plurality of second engagement teeth 40 are disposed on the vehicle rear side of the second flange 38. These second engagement teeth 40 are formed around the central axis of the second flange 38 at a predetermined interval. The interval between the second engaging teeth 40 adjacent to each other around the central axis of the second rotating portion 36 is equal to the first engagement of the first rotating portion 30 adjacent to the periphery of the first rotating portion 30 of the rotating member 28 described above. The interval between the teeth 34 is the same.

  Further, each of the second engaging teeth 40 of the second rotating portion 36 of the rotating member 28 is adjacent to the center axis of the first rotating portion 30 of the rotating member 28 when viewed in the central axis direction of the rotating member 28. It arrange | positions in the approximate center between the 1st engaging teeth 34 of 1 rotation part 30. FIG. In this state, the second rotating unit 36 is connected to the first rotating unit 30, and the second rotating unit 36 is restricted in relative movement with respect to the first rotating unit 30 including relative rotation with respect to the first rotating unit 30. Yes.

  Further, the vehicle front side portion of the second rotating portion 36 of the rotating member 28 with respect to the second flange 38 serves as a lock base 44 of the lock mechanism 42. The lock base 44 includes a pawl pin 46. The axial direction of the pawl pin 46 is the vehicle longitudinal direction, and the vehicle rear side end portion of the pawl pin 46 is supported by the lock base 44 (that is, the rotating member 28). The lock base 44 is provided with a lock pawl 48. The base end portion of the lock pawl 48 is supported by the pawl pin 46 so as to be rotatable around the pawl pin 46.

  Corresponding to the lock pawl 48 of the lock base 44, a cover plate 50 as a restraining means constituting both the lock mechanism 42 and the pretensioner 26 is fixed on the vehicle front side of the leg plate 16 of the frame 12. The cover plate 50 is opened to the vehicle rear side, and the bottom plate 52 of the cover plate 50 is opposed to the leg plate 16 in a state of being separated from the leg plate 16 of the frame 12 to the vehicle front side.

  A ratchet hole 54 is formed in the bottom plate 52 of the cover plate 50, and ratchet teeth are formed on the inner peripheral portion of the ratchet hole 54. The lock pawl 48 of the lock base 44 is opposed to the inner peripheral portion of the ratchet hole 54 of the bottom plate 52 of the cover plate 50 in the rotational radial direction, and when the lock pawl 48 is rotated to one side around the pawl pin 46, The distal end portion of the lock pawl 48 approaches the inner peripheral portion of the ratchet hole 54, and the distal end portion of the lock pawl 48 meshes with the ratchet teeth of the ratchet hole 54. As a result, the rotation of the lock base 44 in the pull-out direction is limited, and the rotation of the spool 18 in the pull-out direction is indirectly limited.

  A sensor holder 56 of the lock mechanism 42 is provided on the vehicle front side of the cover plate 50. The sensor holder 56 is opened to the rear side of the vehicle, and is fixed to the leg plate 16 of the frame 12 directly or indirectly through the cover plate 50. Inside the sensor holder 56, components constituting a sensor mechanism for detecting an emergency state of the vehicle are accommodated. When the sensor mechanism in the sensor holder 56 is activated in the event of a vehicle emergency, the lock base of the lock mechanism 42 is stored. The lock pawl 48 of the lock base 44 is rotated to one side around the pawl pin 46 in conjunction with the rotation in the pull-out direction of 44.

  On the other hand, the webbing take-up device 10 includes a cylinder 58 as a cylindrical member constituting the pretensioner 26. The cylinder 58 is formed in a cylindrical shape, and the base end portion in the central axis direction of the cylinder 58 is disposed on the vehicle rear upper side of the frame 12. A micro gas generator 60 (hereinafter, referred to as “MGG 60”) that constitutes a load generating means as a fluid pressure generating means is inserted into the proximal end portion of the cylinder 58 in the central axis direction. The MGG 60 is electrically connected to a collision detection sensor (both not shown) provided in the vehicle via an ECU as a control means, and when an impact at the time of the vehicle collision is detected by the collision detection sensor, the ECU The MGG 60 is operated by the gas, and the gas which is one aspect of the fluid generated in the MGG 60 is supplied to the inside of the cylinder 58.

  A seal ball 62 as a piston is disposed inside the cylinder 58 of the pretensioner 26. The seal ball 62 is formed of a synthetic resin material, and the shape of the seal ball 62 in a state where no load is applied to the seal ball 62 is a substantially spherical shape. The internal space of the cylinder 58 is partitioned by a seal ball 62 into a base axial direction proximal end side with respect to the seal ball 62 and a central axial direction distal end side with respect to the seal ball 62. When the MGG 60 is activated and the gas generated in the MGG 60 is supplied between the MGG 60 and the seal ball 62 in the cylinder 58, thereby increasing the internal pressure between the MGG 60 and the seal ball 62 in the cylinder 58, The seal ball 62 is moved toward the distal end side in the central axis direction of the cylinder 58 and is compressed and deformed in the central axis direction of the cylinder 58.

  A moving member 64 is disposed inside the cylinder 58 of the pretensioner 26. The moving member 64 is formed in a cylindrical shape by a synthetic resin material, and can be deformed by receiving an external force. The moving member 64 is disposed on the distal end side in the central axis direction of the cylinder 58 with respect to the seal ball 62, and when the seal ball 62 is moved toward the distal end side in the central axis direction of the cylinder 58, the moving member 64 is moved to the seal ball 62. And is moved toward the front end side of the cylinder 58 in the central axis direction.

  On the other hand, the cylinder 58 of the pretensioner 26 is bent at an intermediate portion in the center axis direction, and the tip end portion in the center axis direction of the cylinder 58 is disposed on the vehicle front upper side of the leg plate 16 of the frame 12. It is held between the leg plates 16. The front end in the central axis direction of the cylinder 58 is opened to the lower side of the vehicle (more specifically, the direction inclined toward the outer side in the vehicle width direction with respect to the lower side of the vehicle) and reaches the front end in the central axis direction of the cylinder 58. When the moving member 64 is further pressed and moved by the seal ball 62, the moving member 64 protrudes from the front end in the central axis direction of the cylinder 58 to the vehicle lower side.

  Further, the front end surface in the central axis direction of the cylinder 58 is a plane orthogonal to the central axis direction at the front end portion in the central axis direction of the cylinder 58, and the front end surface in the central axis direction of the cylinder 58 and the front end portion in the central axis direction of the cylinder 58. The inner peripheral surface of the cylinder 58 is orthogonal to the inner peripheral edge of the front end surface in the central axis direction of the cylinder 58, and the front end surface of the cylinder 58 in the central axial direction and the front end portion of the cylinder 58 in the central axial direction are The outer peripheral surface is orthogonal to the outer peripheral edge of the front end surface in the central axis direction of the cylinder 58.

  On the inner side of the cover plate 50, the lower side of the vehicle than the front end in the central axis direction of the cylinder 58 (more specifically, the direction side inclined outward in the vehicle width direction with respect to the lower side of the vehicle) Has been. As shown in FIG. 3, in the first deformation permitting portion 66, the space substantially below the vehicle from the front end in the central axis direction of the cylinder 58 is the center of the cylinder 58 from the outer peripheral edge at the front end in the central axis direction of the cylinder 58. It spreads outward in the direction perpendicular to the axis. For this reason, the moving member 64 protruding to the vehicle lower side than the front end in the central axis direction of the cylinder 58 can be deformed so as to expand outward in the axis orthogonal direction of the moving member 64.

  Here, in the present embodiment, the front end of the cylinder 58 in the central axis direction is the first restricting portion 68. As shown in FIG. 7, when the moving member 64 that protrudes to the vehicle lower side than the front end in the central axis direction of the cylinder 58 is expanded outward in the direction perpendicular to the axis of the moving member 64 by the first deformation permitting portion 66. The expansion portion of the moving member 64 is opposed to the first restricting portion 68 (the front end in the central axis direction of the cylinder 58) of the cylinder 58 in the central axis direction of the cylinder 58 at the front end portion in the central axis direction of the cylinder 58. For this reason, when the moving member 64 projected to the vehicle lower side than the front end in the central axis direction of the cylinder 58 tries to return to the cylinder 58, the expansion portion of the moving member 64 outwards in the direction perpendicular to the central axis of the moving member 64 58 is abutted against the first restricting portion 68 (the tip of the cylinder 58 in the central axis direction).

  Further, on the inner side of the cover plate 50, the above-described rotating member 28 is disposed on the lower side of the vehicle than the first deformation permitting portion 66 (more specifically, on the side inclined in the vehicle width direction outer side with respect to the lower side of the vehicle). Has been placed. When the moving member 64 pressed by the seal ball 62 is moved substantially below the vehicle relative to the first deformation permitting portion 66 of the cover plate 50, the first flange 32 and the first flange 32 of the first rotating portion 30 of the rotating member 28 are connected. 2 between the second rotating portion 36 and the second flange 38 of the rotating member 28, abutting on the first engaging tooth 34 of the first rotating portion 30 of the rotating member 28 or the second engaging tooth 40 of the second rotating portion 36. The first engaging tooth 34 or the second engaging tooth 40 is pressed downward by the moving member 64.

  As a result, the rotating member 28 is rotated in the winding direction (the arrow A direction in FIG. 3 and the like), and the moving member 64 is further moved to the lower side of the vehicle by the pressure from the seal ball 62. Thus, the moving member 64 is moved to the vehicle lower side, and the rotating member 28 is rotated in the winding direction, whereby the first engaging teeth 34 and the second rotating portion of the first rotating portion 30 of the rotating member 28 are rotated. The 36 second engaging teeth 40 pierce the moving member 64. In this state, when the moving member 64 is further moved to the vehicle lower side, the rotating member 28 is further rotated in the winding direction.

  In addition, a guide portion 70 is provided on the lower side of the vehicle than the first deformation allowing portion 66 in the cover plate 50. The guide part 70 is a part of the inner side in the vehicle width direction of the side wall 72 as the wall part of the cover plate 50, and as shown in FIGS. 2 and 3, the guide part 70 has a side wall of the cover plate 50. 72 is deformed inside the cover plate 50 and outward in the vehicle width direction. As shown in FIG. 3, the inner surface of the side wall 72 of the cover plate 50 in the lower portion of the guide portion 70 is in the vehicle width direction inner portion of the inner peripheral surface at the front end in the central axis direction of the cylinder 58. The cylinder 58 is disposed on the alternate long and short dash line C toward the front end side in the central axis direction. Further, the vehicle lower end portion of the guide portion 70 is perpendicular to the central axis direction of the cylinder 58 at the front end portion in the central axis direction of the cylinder 58 and is on a one-dot chain line D passing through the inner side in the vehicle width direction from the rotation center of the rotating member 28. The vehicle lower end of the guide portion 70 is disposed on the vehicle lower side than the alternate long and short dash line D.

  Furthermore, the vehicle deformation | transformation lower part 74 of the guide part 70 in the cover plate 50 is made into the 2nd deformation | transformation permission part 74. FIG. In the second deformation allowing portion 74, the inner side surface of the side wall 72 of the cover plate 50 is disposed on the inner side in the vehicle width direction than the inner side surface of the side wall 72 of the cover plate 50 in the guide portion 70. For this reason, in the 2nd deformation | transformation permission part 74, the moving member 64 can expand | swell to a vehicle width direction inner side.

  Here, the vehicle lower side surface of the guiding portion 70 is a second restricting portion 76. The second restricting portion 76 is a plane orthogonal to the central axis direction of the cylinder 58 at the front end in the central axial direction of the cylinder 58, and the moving member 64 expands inward in the vehicle width direction at the second deformation allowing portion 74. Then, the expanded portion of the moving member 64 is opposed to the second restricting portion 76 in the central axis direction of the cylinder 58 at the front end in the central axis direction of the cylinder 58. For this reason, when the moving member 64 tries to move to the proximal side in the axial direction, the expanded portion of the second deformation allowing portion 74 in the moving member 64 is brought into contact with the second restricting portion 76.

  Further, a lower portion of the vehicle than the second deformation allowing portion 74 in the side wall 72 of the cover plate 50 is a curved portion 78. The curved portion 78 is curved with the rotation center side of the rotating member 28 as the center of curvature. The curved portion 78 has a larger distance from the rotation center of the rotating member 28 toward the winding direction side. At the winding direction side end 78A of the curved portion 78, the distance from the rotational center of the rotating member 28 is The radial dimension of the tip circle of the first engaging tooth 34 and the second engaging tooth 40 in the rotating member 28 and the sum of the diameter dimension of the moving member 64 are set to be greater than or equal to. For this reason, the moving member 64 is bent following the curved portion 78, so that it moves away from the first engaging tooth 34 or the second engaging tooth 40 of the rotating member 28 at the winding direction side end 78 </ b> A of the curved portion 78. be able to.

  Here, the rotation center of the rotation member 28 is defined with respect to the alternate long and short dash line D passing through the vehicle width direction inner side from the rotation center of the rotation member 28 perpendicular to the center axis direction of the cylinder 58 at the front end in the center axis direction of the cylinder 58. The angle θ formed by the alternate long and short dash line E passing through the winding direction side end 78A of the curved portion 78 is set to be less than 180 degrees. In particular, in the present embodiment, the angle θ is set to 90 degrees. Yes.

  Further, a first corner portion 80 as a corner portion is formed on the outer side in the vehicle width direction of the curved portion 78 in the side wall 72 of the cover plate 50, and the curved portion sandwiching the first corner portion 80 in the side wall 72. The side opposite to 78 extends from the first corner portion 80 in a direction inclined inward in the vehicle width direction with respect to the vehicle upper side. A portion of the side wall 72 of the cover plate 50 extending from the first corner portion 80 toward the vehicle upper side is inclined with respect to the alternate long and short dash line E so as to be separated from the alternate long and short dash line E. In contrast, the first corner portion 80 of the side wall 72 of the cover plate 50 is bent with the inside of the cover plate 50 as the center of curvature, and the curvature radius of the first corner portion 80 is the curvature of the side wall 72 of the cover plate 50. The radius of curvature of the portion 78 is made smaller.

  Further, a second corner portion 82 as a corner portion is formed in the vehicle upper portion of the side wall 72 of the cover plate 50 relative to the first corner portion 80, and the first corner portion sandwiching the second corner portion 82 in the side wall 72. The opposite side of the corner portion 80 extends from the second corner portion 82 inward in the vehicle width direction. The second corner portion 82 of the side wall 72 of the cover plate 50 is bent with the inside of the cover plate 50 being the center of curvature, and the radius of curvature of the second corner portion 82 is the radius of curvature of the curved portion 78 of the side wall 72 of the cover plate 50. It is as follows. On the other hand, the portion of the side wall 72 of the cover plate 50 that extends inward in the vehicle width direction from the second corner portion 82 is bent along the cylinder 58 on the side of the cylinder 58.

  Such a cover plate 50 is fixed to the leg plate 16 of the frame 12 by a plurality of first rivets 84 and one second rivet 86 shown in FIG. A flange portion 88 extends from the side wall 72 of the cover plate 50 to the outside of the cover plate 50, and the first rivet 84 is connected to the flange portion 88 of the cover plate 50 and the leg plate 16 of the frame 12 from the cover plate 50 side. The first rivet 84 is caulked at the tip (vehicle rear side end) in a state of penetrating through the first rivet 84.

  On the other hand, the second rivet 86 as a restricting means is provided on the vehicle upper side of the rotating member 28 on the outer side in the vehicle width direction at the front end of the cylinder 58 in the central axis direction. The second rivet 86 is caulked from the cover plate 50 side through the bottom plate 52 of the cover plate 50 and the leg plate 16 of the frame 12, and the second rivet 86 is caulked at the front end (vehicle rear side end). The intermediate portion of the second rivet 86 is a movement restricting portion 90, and as shown in FIG. 8, the axial end of the moving member 64 is brought into contact with the movement restricting portion 90 of the second rivet 86. The movement of the moving member 64 toward the distal end side in the axial direction is restricted. Further, in the present embodiment, the axial base end of the moving member 64 is the center of the cylinder 58 in the cylinder 58 with the axial tip of the moving member 64 being in contact with the movement restricting portion 90 of the second rivet 86. The axial length of the moving member 64 is set so as not to come off from the tip in the axial direction.

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

  In the webbing take-up device 10, the sensor mechanism of the lock mechanism 42 is activated at the time of a vehicle collision, which is an aspect of a vehicle emergency. When the sensor mechanism of the lock mechanism 42 is in an operating state, the lock pawl 48 of the lock base 44 moves to one side around the pawl pin 46 in conjunction with the rotation of the lock base 42 in the pull-out direction (the direction of arrow B in FIG. 1 and the like). It is rotated. As a result, the front end portion of the lock pawl 48 approaches the inner peripheral portion of the ratchet hole 54 of the bottom plate 52 of the cover plate 50, the front end portion of the lock pawl 48 meshes with the ratchet teeth of the ratchet hole 54, and the lock base 44 is pulled out. Rotation in the direction is limited.

  The lock base 44 is formed in the second rotating portion 36 of the rotating member 28, and the first rotating portion 30 of the rotating member 28 is restricted in relative rotation with respect to the second rotating portion 36 and the vehicle of the torsion bar 24. The front side is connected. Since both the first rotating portion 30 and the spool 18 of the rotating member 28 are restricted in relative rotation with respect to the torsion bar 24, the rotation of the rotating member 28 in the drawing direction (the direction of arrow B in FIG. 1 and the like) is restricted. As a result, the rotation of the spool 18 in the pull-out direction is limited. This restricts the pulling of the webbing 20 from the spool 18, so that the occupant's body can be restrained by the webbing 20.

  Further, when the occupant attempts to move to the front side of the vehicle while the rotation of the lock base 44 in the pull-out direction (arrow B direction in FIG. 1 and the like) is restricted, a tensile force is applied to the webbing 20 from the occupant's body. Rotational force in the pull-out direction based on this tensile force is applied to the rear portion of the torsion bar 24 through the spool 18. When the rotational force in the pull-out direction applied to the rear portion of the torsion bar 24 exceeds the mechanical strength of the torsion bar 24, the rear portion of the torsion bar 24 rotates in the pull-out direction with respect to the front portion of the vehicle. Torsionally deformed.

  The spool 18 is rotated in the pull-out direction (the direction of arrow B in FIG. 1 and the like) by the amount of torsional deformation of the torsion bar 24, and the webbing 20 having a length corresponding to the rotation amount in the pull-out direction of the spool 18 is pulled out from the spool 18. Is done. The occupant can move to the front side of the vehicle by the length of the pull-out of the webbing 20 from the spool 18 and a part of the tensile force applied to the webbing 20 from the occupant is subjected to torsional deformation of the torsion bar 24 and absorbed. .

  In the webbing take-up device 10, when the MGG 60 of the pretensioner 26 is operated by the ECU at the time of a vehicle collision, which is an aspect of a vehicle emergency, high-pressure gas is instantaneously supplied from the MGG 60 to the inside of the cylinder 58. The When the seal ball 62 is moved to the front end side in the central axis direction of the cylinder 58 by the pressure of this gas, the moving member 64 is pressed by the seal ball 62 and the moving member 64 is moved to the front end side in the central axis direction of the cylinder 58. .

  When the moving member 64 is moved toward the front end in the axial direction, the front end in the axial direction of the moving member 64 is pulled out from the front end in the central axial direction of the cylinder 58 to the vehicle lower side (in the direction of arrow F in FIG. 3 and the like). An inner portion in the vehicle width direction at the tip end portion in the axial direction of the member 64 is brought into contact with the inner surface of the cover plate 50 in the guide portion 70 provided on the side wall 72 of the cover plate 50. In this state, when the moving member 64 is further moved to the axial front end side, the moving member 64 enters between the first flange 32 and the second flange 38 of the rotating member 28 as shown in FIG. When the first engaging tooth 34 or the second engaging tooth 40 of the rotating member 28 is pressed toward the vehicle lower side (in the direction of arrow F in FIG. 4 and the like) by the axial tip of the moving member 64, the rotating member 28 is wound up. It is rotated in the direction (direction of arrow A in FIG. 4 etc.).

  Further, out of the plurality of first engagement teeth 34 or second engagement teeth 40 of the rotating member 28, the first engagement teeth 34 or the second engagement teeth 40 pressed against the distal end in the axial direction of the moving member 64. As shown in FIG. 5, the first engagement teeth 34 or the second engagement teeth 40 on the drawing direction side (the arrow B direction side in FIG. 4 and the like) are moved by rotation of the rotation member 28 in the winding direction. 64 bites or pierces from the outer peripheral surface of 64 to the radially central side of the moving member 64.

  As described above, the moving member 64 in which the first engaging tooth 34 or the second engaging tooth 40 of the rotating member 28 is bitten or pierced is moved to the vehicle lower side (in the direction of arrow F in FIG. 5 and the like), The rotating member 28 is further rotated in the winding direction (the direction of arrow A in FIG. 5 and the like). The rotation of the rotary member 28 in the winding direction is transmitted to the spool 18 via the torsion bar 24, and the spool 18 is rotated in the winding direction. As a result, the webbing 20 is wound around the spool 18 and the restraining force of the occupant by the webbing 20 is increased.

  Further, the first engagement teeth 34 or the second engagement teeth 40 of the rotating member 28 bite or pierce the moving member 64 above the position of the dashed line D in FIG. From this state, when the rotating member 28 is rotated in the winding direction (the direction of arrow A in FIG. 3 and the like) by the movement of the moving member 64 toward the front end in the axial direction, The amount of biting or sticking of the two engaging teeth 40 with respect to the moving member 64 (that is, the engagement range of the first engaging teeth 34 or the second engaging teeth 40 of the rotating member 28 with respect to the moving member 64) is increased.

  The direction from the center of the rotation member 28 to the tip of the first engagement tooth 34 or the tip of the second engagement tooth 40 is the same as the first engagement tooth 34 or the second engagement tooth 40 of the rotation member 28 in the moving member 64. 3 is perpendicular to the axial direction of the moving member 64 (that is, the tip end of the first engaging tooth 34 or the tip end of the second engaging tooth 40 of the rotating member 28 is the one-dot chain line D in FIG. When disposed on the first engagement tooth 34 or the second engagement tooth 40 of the rotating member 28, the amount of biting or sticking into the moving member 64 (that is, the first engagement of the rotating member 28 with respect to the moving member 64). The engagement range of the teeth 34 or the second engagement teeth 40) is maximized.

  Further, the vehicle lower end of the guide portion 70 of the cover plate 50 is disposed on the vehicle lower side than the one-dot chain line D of FIG. For this reason, the length from the rotation center of the rotating member 28 to the inner side surface of the cover plate 50 in the guide portion 70 is lower than the one-dot chain line D in FIG. It is longer than the length from the center of rotation of the rotating member 28 to the inner surface of the cover plate 50 in the guiding portion 70.

  As a result, the moving member 64 is moved to the front end side in the axial direction in a state where the moving member 64 is in contact with the inner surface of the cover plate 50 in the guide portion 70 of the cover plate 50, whereby the moving member 64 is 3 passes through the position of the one-dot chain line D, the moving member 64 is separated from the rotation center of the rotating member 28. Therefore, the amount of biting or sticking of the first engaging tooth 34 or the second engaging tooth 40 of the rotating member 28 with respect to the moving member 64 (that is, the first engaging tooth 34 or the first engaging tooth 34 of the rotating member 28 with respect to the moving member 64). (The engagement range of the two engagement teeth 40) is reduced.

  Further, in this embodiment, from this state, the moving member 64 is further moved to the lower side of the vehicle (in the direction of arrow F in FIG. 5), and the moving member 64 moves to the guide portion 70 and the second deformation allowing portion 74 of the cover plate 50. The side of the moving member 64 reaches the curved portion 78 set on the side wall 72 of the cover plate 50. When the moving member 64 is further moved toward the distal end side in the axial direction from the state where the curved portion 78 is reached, the moving member 64 is brought into contact with the inner surface of the cover plate 50 in the curved portion 78, and the distal end in the axial direction of the moving member 64. Along with the movement to the side, the moving member 64 is bent and deformed with the rotation center side of the rotating member 28 as the center of curvature following the inner surface of the curved portion 78.

  Here, the bent portion 78 of the cover plate 50 has a larger distance from the rotation center of the rotating member 28 toward the winding direction side (the arrow A direction side in FIG. 5 and the like). At the direction side end 78A, the distance from the rotation center of the rotating member 28 is such that the radial dimension of the tip circle of the first engaging tooth 34 and the second engaging tooth 40 in the rotating member 28 and the diameter dimension of the moving member 64 Has been more than the sum of.

  For this reason, the moving member 64 moves away from the rotation center of the rotating member 28 by being moved to the tip end side in the axial direction while being bent following the curved portion 78. Accordingly, the first engaging tooth 34 or the second engaging member 34 of the rotating member 28 is moved along with the movement of the moving member 64 toward the distal end in the axial direction and the rotation of the rotating member 28 in the winding direction (the direction of arrow A in FIG. 5 and the like). The amount of biting or sticking of the engaging tooth 40 to the moving member 64 is reduced. Therefore, the moving member 64 is bent along the curved portion 78 while being moved to the tip end side in the axial direction, so that the bending radius of curvature of the moving member 64 is increased.

  A part of the force that moves the moving member 64 toward the distal end in the axial direction (that is, the gas pressure generated in the MGG 60) is caused by bending deformation of the moving member 64 and friction between the moving member 64 and the inner surface of the curved portion 78. Absorbed by etc. However, as described above, the amount of biting or sticking into the moving member 64 of the first engaging tooth 34 or the second engaging tooth 40 of the rotating member 28 is reduced, and the bending radius of curvature of the moving member 64 is increased. Accordingly, it is possible to suppress absorption of force that moves the moving member 64 toward the distal end side in the axial direction due to bending deformation of the moving member 64, friction between the moving member 64 and the inner surface of the curved portion 78, and the like.

  Further, at the winding direction side end 78A of the curved portion 78 of the cover plate 50, the biting or sticking of the first engaging tooth 34 or the second engaging tooth 40 of the rotating member 28 to the moving member 64 is eliminated, and FIG. As shown in FIG. 5, the moving member 64 moves away from the first engaging tooth 34 or the second engaging tooth 40 of the rotating member 28 on the outer side in the vehicle width direction than the winding direction side end 78 </ b> A of the curved portion 78.

  Thus, the biting or sticking of the first engagement teeth 34 or the second engagement teeth 40 of the rotating member 28 is eliminated in the moving member 64, and the moving member 64 is separated from the first engagement teeth 34 or the second engagement teeth 40. The disengagement portion 64A of the moving member 64 from the rotating member 28 is deformed by a restoring force based on the elasticity of the moving member 64 itself. Thereby, the curvature radius of bending of the moving member 64 becomes larger than the state where the first engaging teeth 34 or the second engaging teeth 40 of the rotating member 28 are bitten or pierced (see FIGS. 6 and 7). In this state, when the moving member 64 is further moved toward the front end in the axial direction, the front end in the axial direction of the moving member 64 is moved to the upper side of the vehicle, and as shown in FIG. In the side wall 72 of the cover plate 50, the cover plate 50 is brought into contact with an inner portion in the vehicle width direction with respect to the second corner portion 82. As a result, the movement member 64 is inhibited from moving in the axial direction distal end side.

  Here, the radius of curvature of the first corner portion 80 of the side wall 72 of the cover plate 50 is smaller than the radius of curvature of the curved portion 78 of the side wall 72 of the cover plate 50, and the second corner portion of the side wall 72 of the cover plate 50. The curvature radius of 82 is set to be equal to or less than the curvature radius of the curved portion 78 of the cover plate 50. The moving member 64 is bent following the curved portion 78 of the cover plate 50, and the disengagement portion 64A of the moving member 64 from the rotating member 28 is deformed by a restoring force. For this reason, the curvature radius of the bending of the moving member 64 is larger than the curvature radius of the first corner portion 80 and the curvature radius of the second corner portion 82 of the side wall 72 of the cover plate 50. Accordingly, in the state where movement of the moving member 64 toward the tip end side in the axial direction shown in FIG. 7 is suppressed, the disengagement portion 64A from the rotating member 28 of the moving member 64 and the first corner portion of the side wall 72 of the cover plate 50 A space 92 is formed between 80 and the second corner portion 82.

  For this reason, when the axially proximal end side of the moving member 64 is further moved to the axially distal end side in the movement restrained state of the moving member 64, the disengagement portion 64A from the rotating member 28 of the moving member 64 is , The space 92 is reduced and is deformed so as to approach the side wall 72 of the cover plate 50, and as shown in FIG. 8, the disengagement portion 64 </ b> A from the rotating member 28 of the moving member 64 is 72 abuts. When the contact between the distal end in the axial direction of the moving member 64 and the side wall 72 of the cover plate 50 is eliminated by the deformation of the engagement releasing portion 64A of the moving member 64 from the rotating member 28, the rotating member of the moving member 64 is removed. The engagement release portion 64 </ b> A from 28 is moved toward the distal end side in the axial direction of the moving member 64. As a result, the axial tip of the moving member 64 comes into contact with the movement restricting portion 90 at the intermediate portion of the second rivet 86, and the movement of the moving member 64 toward the axially distal end is restricted.

  Here, in the present embodiment, the movement member 64 is moved in the state in which the movement of the movement member 64 toward the distal end side in the axial direction is suppressed by the inner side portion in the vehicle width direction than the second corner portion 82 on the side wall 72 of the cover plate 50. When the axial base end side is moved to the axial front end side, the disengagement portion 64A of the moving member 64 from the rotating member 28 is deformed. Thereby, a part of the energy of the impact when the axial tip of the moving member 64 comes into contact with the side wall 72 of the cover plate 50 is absorbed by the deformation of the moving member 64.

  In addition, the moving member 64 is deformed and moved to the distal end side in the axial direction of the moving member 64, and the distal end in the axial direction of the moving member 64 is brought into contact with the movement restricting portion 90 of the second rivet 86. For this reason, the impact when the axial end of the moving member 64 comes into contact with the movement restricting portion 90 at the intermediate portion of the second rivet 86 is reduced. As a result, the mechanical strength of the cover plate 50 and the mechanical strength of the second rivet 86 can be suppressed, and the weight of the cover plate 50 and the second rivet 86 can be reduced.

  In the present embodiment, the radius of curvature of the first corner portion 80 of the side wall 72 of the cover plate 50 is smaller than the radius of curvature of the curved portion 78 of the side wall 72 of the cover plate 50, and the side wall 72 of the cover plate 50. The radius of curvature of the second corner portion 82 is equal to or less than the radius of curvature of the curved portion 78 of the cover plate 50.

  Accordingly, the movement of the moving member 64 from the rotating member 28 in a state where the movement of the moving member 64 toward the front end side in the axial direction is suppressed by the inner side portion in the vehicle width direction of the side wall 72 of the cover plate 50 from the second corner portion 82. Even if the disengagement portion 64A is bent, a space 92 can be formed between the disengagement portion 64A of the moving member 64 from the rotating member 28 and the side wall 72 of the cover plate 50, and the moving member 64 has the space 92. And can be deformed so as to approach the side wall 72 of the cover plate 50.

  For this reason, even if the moving member 64 that has been removed from the front end in the central axial direction of the cylinder 58 is accommodated inside the cover plate 50, the axial direction of the moving member 64 is not particularly increased in size. In a state where the movement toward the front end side is suppressed by the inner side portion in the vehicle width direction of the side wall 72 of the cover plate 50 with respect to the second corner portion 82, the deformation of the moving member 64 from the rotating member 28 to the disengagement portion 64 </ b> A is further improved. Can be generated.

  Moreover, in this Embodiment, 64 A of engagement cancellation | release parts from the rotation member 28 of the moving member 64 can be accommodated in the cover plate 50 as a suppression means. Here, as described above, in the present embodiment, the mechanical strength of the configuration for accommodating the disengagement portion 64A from the rotating member 28 of the moving member 64 can be suppressed from being increased, and the weight can be reduced. Is possible. In addition, in the present embodiment, the disengagement portion 64 </ b> A of the moving member 64 from the rotating member 28 is located on the inner side of the cover plate 50 with the rotation center of the rotating member 28 interposed therebetween. The second engaging teeth 40 are arranged on the side opposite to the portion that pierces or bites into the moving member 64. For this reason, it can suppress that one of the vehicle vertical direction dimension and the vehicle width direction dimension of the cover plate 50 becomes extremely large with respect to the other.

  In the present embodiment, the cover plate 50 that accommodates the disengagement portion 64A from the rotating member 28 of the moving member 64 is the suppression means. However, for example, the leg plate 16 of the frame 12 may be formed with a portion where the axial distal end of the disengagement portion 64A of the moving member 64 from the rotating member 28 can abut, and this portion may be used as the restraining means. The cover plate 50 may be provided separately.

10 Webbing take-up device 18 Spool 20 Webbing 28 Rotating member 50 Cover plate (suppressing means)
64 Moving member 72 Side wall (wall part)
78 tune part 80 1st corner part (corner part)
82 Second Corner (Corner)
86 Second rivet (limitation means)

Claims (6)

A spool on which the webbing of the seat belt device is wound by being rotated in the winding direction;
A rotating member that rotates the spool in the winding direction by rotation to one side;
When the vehicle is urgently moved, it is engaged with the rotating member to rotate the rotating member to one side by being moved to the axially leading end side, and the axial proximal end side is prevented from moving to the axially leading end side. A movable member that can be deformed by receiving a load from
A restraining means for restraining movement of the moving member toward the distal end side in the axial direction by contacting the distal end portion in the axial direction of the moving member;
A webbing take-up device comprising:   2. The webbing take-up according to claim 1, wherein a space is formed between the suppressing unit and the moving member on a side intersecting the axial direction of the moving member in a state in which the movement of the moving member is suppressed. apparatus. The suppression means is
A curved portion in which the moving member is bent by being moved toward the distal end in the axial direction in a state in which the moving member is in contact;
A space is formed between the moving member and the moving member in a state where movement of the moving member is restrained by the restraining means, provided on the opposite side of the center of curvature of bending at the portion that has passed the curved portion. Wall to be
A webbing take-up device according to claim 2.   The wall portion includes a corner portion that is bent with the moving member side, which is suppressed from moving toward the tip end in the axial direction by the suppressing means, as a center of curvature, and a radius of curvature equal to or less than the radius of curvature of the curved portion. The webbing take-up device according to claim 3.   The moving member deformed in a state where movement of the suppressing unit is suppressed can be brought into contact, and the moving member is provided with a limiting unit that restricts the movement of the moving member toward the distal end side in the axial direction. The webbing take-up device according to any one of claims 1 to 4.   The webbing take-up device according to any one of claims 1 to 5, wherein the suppressing means accommodates the moving member engaged with the rotating member.

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