JP5180005B2 - Webbing take-up device - Google Patents

Description

  The present invention relates to a webbing retractor that winds and stores a webbing belt for restraining the body of an occupant seated in a vehicle seat.

  A webbing take-up device that constitutes a seat belt device for a vehicle locks the spool when the vehicle is suddenly decelerated so that the webbing belt taken up by the spool cannot be pulled out any further. A lock mechanism is provided, and an example thereof is disclosed in Patent Document 1 below.

The locking mechanism provided in the webbing take-up device disclosed in Patent Document 1 includes a locking base. The locking base is connected to a spool (referred to as a bobbin in Patent Document 1) directly or indirectly via a torsion shaft (referred to as a winding shaft in Patent Document 1), etc. Rotate. The lock mechanism includes a lock pawl (referred to as a pole in Patent Document 1) corresponding to the locking base. The lock pawl engages with the locking base when the spool rotates at a high speed in the pull-out direction, which is the rotation direction of the spool when the vehicle is rapidly decelerating or when the webbing belt is pulled out. Regulates rotation of the spool in the pull-out direction.
JP 2002-53008 A

  Thus, since the lock mechanism is configured by a member that rotates together with the spool or a member that interlocks with the rotation of the spool, these members are arranged on the side of one end in the axial direction of the spool so that they are aligned in the axial direction of the spool. There are many cases. For this reason, it is difficult to downsize the entire apparatus along the axial direction of the spool by providing such a locking mechanism.

  In view of the above fact, an object of the present invention is to obtain a webbing take-up device capable of downsizing the entire device along the axial direction of the spool.

In the webbing take-up device according to the first aspect of the present invention, the base end side in the longitudinal direction of the webbing belt formed in a long band shape is locked, and rotates in the take-up direction which is one of its own axes. A spool that winds the webbing belt from the longitudinal base end side, and a spool that is capable of engaging or disengaging with respect to a position that can be directly or indirectly engaged with the spool. Restricting means for restricting rotation of the spool in a direction opposite to the winding direction; and at least a position on the one side in the axial direction of the spool at a position displaced outward in the rotational radial direction of the spool with respect to the spool. A part is provided, and when the vehicle satisfies a predetermined condition and / or when the spool starts rotating at a predetermined speed or more in the pull-out direction, And locking means for moving said restriction means to directly or indirectly engaged to the position relative to the Le, coaxially arranged with respect to the spool in the axial direction one side of the spool, rotating integrally with said spool An output side transmission gear that engages with the output side transmission gear on the outside of the output side transmission gear along the rotational radius direction of the output side transmission gear, rotates in conjunction with the output side transmission gear, and And an input side transmission gear for transmitting a rotational force to at least a part of other members constituting the locking means .

  According to the webbing take-up device according to the first aspect of the present invention, when the vehicle satisfies a predetermined condition such as when the vehicle suddenly decelerates, and the spool for winding the webbing belt exceeds a predetermined speed in the pull-out direction. In at least one of the cases where the rotation is started, the locking means is activated. When the locking means is activated, the restricting means moves and the restricting means engages the spool directly or indirectly.

  In this way, when the restricting means is directly or indirectly engaged with the spool, the rotation of the spool in the pull-out direction, which is the rotation direction of the spool when pulling out the webbing belt from the spool, is restricted. By restricting the rotation of the spool in the pulling-out direction in this way, the pulling out of the webbing belt from the spool is restricted. As a result, the body of the passenger wearing the webbing belt is more strongly held by the webbing belt.

Here, in the webbing take-up device according to the present invention, at least a part of the configuration of the locking means is provided at a position displaced outward in the rotational radius direction of the spool with respect to the spool. For this reason, the size of the entire apparatus along the axial direction of the spool can be reduced as compared with the configuration in which the members constituting the locking means are sequentially arranged from one end in the axial direction of the spool.
In the webbing take-up device according to the present invention, when the spool rotates, the output-side transmission gear provided coaxially with the spool rotates together with the spool. When the output-side transmission gear rotates in this way, the input-side transmission gear that meshes with the output-side transmission gear rotates. This input-side transmission gear constitutes a lock means. When the input-side transmission gear rotates, the rotation of the input-side transmission gear, that is, the rotation of the spool is transmitted to at least a part of other members constituting the lock means.
Here, as described above, the rotation of the spool is transmitted to at least a part of the members constituting the locking means via the output side transmission gear and the input side transmission gear, but the output side provided coaxially with the spool. The input side transmission gear meshes with the transmission gear in the rotational radius outward direction. For this reason, at least a part of the structure of the locking means can be provided at a position displaced outward in the rotational radial direction of the spool with respect to the spool. Compared to a configuration in which members are arranged in order, the overall size of the apparatus along the axial direction of the spool can be reduced.

  A webbing take-up device according to a second aspect of the present invention is the webbing take-up device according to the first aspect of the present invention, wherein, in the lock means, the vehicle is rapidly decelerated and the winding direction is greater than a predetermined speed. Has a mechanism for detecting at least one of the rotations of the spool in the opposite direction at a position displaced outward in the rotational radial direction of the spool with respect to the spool and on one side in the axial direction of the spool. The vehicle is subjected to an impact when a rotational force in the direction opposite to the winding direction is input to the spool in a state where the rotation of the spool in the direction opposite to the winding direction is restricted by the regulating means. The transmission to the mechanism side that detects at least one of the rotation of the spool in the direction opposite to the winding direction in the rapid deceleration state and at a predetermined speed or higher is cut off.

  According to the webbing take-up device of the present invention as set forth in claim 2, of the locking means, the vehicle is rapidly decelerated and the spool rotates in the direction opposite to the take-up direction at a predetermined speed or higher. A mechanism for detecting at least one of them is provided at a position displaced outward in the rotational radial direction of the spool with respect to the spool and on one side in the axial direction of the spool. In addition, by providing a mechanism for detecting at least one of the sudden deceleration state of the vehicle and the rotation of the spool in the direction opposite to the winding direction at a predetermined speed or more, the winding direction is In a state where the regulation means regulates the rotation of the spool in the opposite direction, the transmission of the impact to the mechanism when the rotational force in the direction opposite to the winding direction is input to the spool is blocked.

  For this reason, the members constituting these mechanisms and the members for transmitting the rotation of the spool to these mechanisms do not have to directly receive the above-mentioned impact. The mechanical strength of the members for transmitting to these mechanisms can be set relatively low, and the weight of these members can be reduced.

  A webbing take-up device according to a third aspect of the present invention is the webbing retractor according to the first or second aspect of the present invention, comprising a pair of leg plates facing each other in the axial direction of the spool. And a frame for supporting the locking means by supporting at least a part of the locking means between the pair of leg plates.

  In the webbing take-up device according to the third aspect of the present invention, the pair of leg plates constituting the frame are opposed to each other along the axial direction of the spool, and the spool is disposed between the leg plates. Both ends in the axial direction are pivotally supported directly or indirectly by the frame.

  Here, in the webbing take-up device according to the present invention, at least part of the locking means (that is, part or all of the locking means) is provided between the pair of leg plates, and the locking means is supported by the frame. . Thus, when at least a part of the locking means is disposed between the pair of leg plates, the number of parts provided outside the leg plates can be reduced. Moreover, the side of the spool between the leg plates tends to be a so-called dead space, but in the present invention, since at least a part of the locking means is provided between the leg plates, the space between the pair of leg plates can be effectively utilized, meaning this However, it contributes to the miniaturization of the entire device.

  As described above, the webbing take-up device according to the present invention can reduce the size of the entire device along the axial direction of the spool.

<Configuration of First Embodiment>
FIG. 5 shows a schematic cross-sectional view of the overall configuration of the webbing retractor 10 according to the first embodiment of the present invention.

  As shown in this figure, the webbing take-up device 10 includes a frame 12. The frame 12 includes a back plate 14 formed in a flat plate shape. The back plate 14 is fixed to the vehicle body in a state in which the width direction is substantially along the longitudinal direction of the vehicle. A leg plate 16 extends from one end in the width direction of the back plate 14 toward one side in the thickness direction of the back plate 14 (the depth side in FIG. 5). A leg plate 18 extends from the end in the same direction as the extension direction of the leg plate 16 from the back plate 14.

  A spool 20 is provided between the leg plate 16 and the leg plate 18. The spool 20 includes a cylindrical spool body 22 whose axial direction is along the opposing direction of the leg plate 16 and the leg plate 18. A longitudinal base end portion of a long belt-like webbing belt 24 is locked to the spool body 22, and when the spool body 22 rotates in one winding direction around the axis, the webbing belt 24 is moved to the longitudinal base end thereof. Winded from the side.

  On the other hand, a torsion shaft 26 as an energy absorbing means is disposed inside the spool body 22. The torsion shaft 26 includes an energy absorbing portion 28. The energy absorbing portion 28 has a bar shape whose longitudinal direction is along the axial direction of the spool body 22, and is provided coaxially with the spool body 22. A connecting portion 30 is formed at the end of the energy absorbing portion 28 on the leg plate 16 side. The connecting part 30 is a non-circular shape such as a hexagonal shape or a star shape when viewed along the axial direction of the energy absorbing part 28.

  At least near the end on the leg plate 16 side of the spool body 22, the inner peripheral shape is slightly larger than the outer peripheral shape of the connecting portion 30, and the connecting portion 30 is fitted to the inner peripheral portion of the spool main body 22. As a result, the coaxial relative rotation of the torsion shaft 26 with respect to the spool body 22 is restricted. A shaft portion (not shown) protrudes from the end of the connecting portion 30 opposite to the energy absorbing portion 28 with respect to the energy absorbing portion 28.

  On the other hand, a spring case 32 is provided on the opposite side of the leg plate 16 from the leg plate 18. The spring case 32 is formed in a hollow shape with an opening on the leg plate 16 side, and is fixed to the leg plate 18. The shaft portion protruding from the connecting portion 30 penetrates the leg plate 16 and enters the spring case 32, and is supported rotatably around the central axis of the energy absorbing portion 28.

  Biasing means (not shown) such as a spiral spring is provided inside the spring case 32. A part of the biasing means (when the biasing means is a spiral spring, an end on the inner side in the spiral direction) is directly or indirectly engaged with the shaft portion protruding from the connecting portion 30, and the other A part (when the biasing means is a spiral spring, an end portion on the outer side in the spiral direction) is directly or indirectly engaged with the spring case 32. The biasing means in the spring case 32 generates a biasing force when the torsion shaft 26 rotates in the pulling direction opposite to the winding direction, and biases the shaft protruding from the connecting portion 30 in the winding direction. To do.

  On the other hand, a lock base 34 is provided on an end side of the spool body 22 on the leg plate 18 side. As shown in FIG. 1, the lock base 34 includes a lock base body 36. The lock base 34 has ratchet teeth formed on the outer periphery. A fitting insertion portion 38 is formed coaxially and integrally with the lock base main body 36 at the end of the lock base main body 36 on the spool main body 22 side (the leg plate 16 side).

  As shown in FIG. 5, the lock base main body 36 is fitted into the spool main body 22 from the end of the spool main body 22 on the axial leg plate 18 side. The outer peripheral shape of the lock base main body 36 is circular, and the inner peripheral shape of the spool main body 22 in the vicinity of the end of the spool main body 22 on the leg plate 18 side is a circular shape coaxial with the spool main body 22. Therefore, the lock base 34 in which the insertion portion 38 is inserted into the spool body 22 from the end of the spool body 22 on the leg plate 18 side is coaxially rotatable with respect to the spool body 22.

  Further, the lock base 34 is formed with a through hole 40 penetrating in the axial direction of the spool body 22. The through hole 40 has a non-circular cross-sectional shape such as a hexagonal shape or a star shape. A connecting portion 42 that can be fitted into the through hole 40 is formed at the end of the energy absorbing portion 28 opposite to the connecting portion 30. Since the cross-sectional shape of the through hole 40 is non-circular, the lock base 34 cannot be rotated relative to the torsion shaft 26 by fitting the connecting portion 42 into the through hole 40. As described above, the torsion shaft 26 is connected to the spool body 22 at the connecting portion 30 so as not to rotate relative to the spool body 22. As a result, the lock base 34 is connected to the spool body 22 via the torsion shaft 26 so as not to rotate relative to the spool body 22. Will be.

  As shown in FIGS. 1 and 5, a gear 50 serving as an output side transmission gear is provided on the leg plate 16 side of the lock base body 36. The gear 50 is formed in a shallow bottomed cylindrical shape in which a cylindrical peripheral wall is erected from an outer peripheral portion of a disk-shaped bottom wall, and flat teeth are formed on the outer peripheral portion thereof. The end of the spool body 22 on the leg plate 18 side can be fitted into the gear 50, and the gear 50 is coaxially attached to the spool body 22 when the spool body 22 is fitted into the gear 50.

  A through hole is formed in the bottom of the gear 50 at a position displaced radially outward from the center of the bottom of the gear 50, and a pin protruding from the end of the spool body 22 on the leg plate 18 side is fitted into this through hole. Inserted. Thereby, relative rotation of the gear 50 with respect to the spool body 22 is restricted, and the gear 50 rotates integrally with the spool body 22.

  On the other hand, as shown in FIG. 5, an outer housing 60 is provided on the opposite side of the leg plate 18 from the leg plate 16. The outer housing 60 accommodates a part or all of a pretensioner mechanism (not shown). The pretensioner mechanism includes a rack bar that slides in a direction intersecting the axial direction of the spool body 22 by the pressure of gas generated by gas generating means such as a gas generator.

  The rack bar slides to engage with a pinion disposed in the vicinity of the rack bar to rotate the pinion. The pinion is coaxially connected via a clutch or the like to a shaft portion that protrudes from the side opposite to the fitting insertion portion 38 of the connecting portion 42. Therefore, the rotation of the pinion is performed by the clutch and lock base 34. Then, it is transmitted to the spool 20 via the torsion shaft 26, and the spool 20 is rotated in the winding direction. Further, the above-described pinion is rotatably supported by the outer housing 60 directly or indirectly. In other words, the spool 20 is indirectly supported rotatably on the outer housing 60 on the leg plate 18 side, and indirectly supported on the spring case 32 on the leg plate 16 side.

  On the other hand, as shown in FIG. 5, an inner housing 70 is provided on the side opposite to the leg plate 16 side of the leg plate 18. Inside the inner housing 70 is provided a lock pawl 72 as a restricting means shown in FIG. The lock pawl 72 is arranged on the side of the lock base main body 36 (lock base 34) along the radial direction, and is the same as the axial direction of the spool main body 22 by the shaft 74 attached to the leg plate 18 while penetrating the leg plate 18. It is swingably supported around an axis whose direction is the axial direction.

  The lock pawl 72 includes a tooth portion 76 that can mesh with ratchet teeth formed on the outer periphery of the lock base body 36. The lock pawl 72 swings around the shaft 74 to be in contact with and away from the outer peripheral portion of the lock base main body 36, and approaches the outer peripheral portion of the lock base main body 36 so as to contact the ratchet teeth of the lock base main body 36. Mesh. Thus, in the state where the tooth portion 76 of the lock pawl 72 is engaged with the ratchet teeth of the lock base main body 36, the rotation of the lock base 34 in the pull-out direction is restricted.

  On the other hand, inside the inner housing 70 shown in FIG. 5, various members constituting the locking mechanism 80 as the locking means shown in FIG. 1 are accommodated. The configuration of the lock mechanism 80 will be described below.

  As shown in FIG. 1, a shaft 82 is provided inside the inner housing 70. The shaft 82 has an axial direction that is the same as the axial direction of the spool body 22, one end (the right end portion in FIG. 1) is supported by the leg plate 18 or the outer housing 60, and the other end (the left end in FIG. 1). Part) is supported by the inner housing 70. Further, a gear 92 as an input side transmission gear is arranged inside the inner housing 70. As shown in FIGS. 1 and 2, the gear 92 includes a bottom wall 94. The bottom wall 94 has a substantially disk shape. A boss 96 is formed on the surface of the bottom wall 94 on the thickness direction leg plate 18 side (the right side in FIG. 1 and the upper side in FIG. 2). The boss 96 has a cylindrical shape coaxial with the bottom wall 94, and is formed coaxially with the bottom wall 94 (and thus the gear 92) at the center of the bottom wall 94.

  A hole corresponding to the inside of the boss 96 is formed in the bottom wall 94, and the shaft 82 passes through the boss 96 and the bottom wall 94. As a result, the gear 92 is rotatably supported around the shaft 82. Further, a cylindrical peripheral wall 98 is erected from the outer peripheral portion of the bottom wall 94 toward the leg plate 18 side. Flat teeth 100 are formed on the outer peripheral portion of the peripheral wall 98. The external teeth 100 mesh with the gear 50 described above, and the rotation of the gear 50 is transmitted to the gear 92. Further, inner ratchet teeth 102 are formed on the inner peripheral portion of the peripheral wall 98.

  Further, an inertia plate 104 as an inertial body is disposed inside the peripheral wall 98. The inertia plate 104 is formed in a disc shape, and a circular hole 106 is formed in the center of the inertia plate 104, and a boss 96 of the gear 92 passes therethrough. Thereby, the inertia plate 104 is supported so that rotation around the boss | hub 96 is possible. The inertia plate 104 has a plurality of (three in this embodiment) cam passage holes 108. These cam passage holes 108 are formed at predetermined angles around the center of the inertia plate 104 on the same circumference of a virtual circle whose center is concentric with the center of the inertia plate 104.

  A hole 110 is formed in the bottom wall 94 of the gear 92 corresponding to each of the cam passage holes 108. A regulating piece 112 is erected from the bottom wall 94 on the radially outer side of the bottom wall 94 with respect to these holes 110. Each regulating piece 112 is formed on the side of each hole 110 and corresponds to each cam passage hole 108, and each regulating piece 112 enters the corresponding cam passage hole 108. As described above, the inertia plate 104 can rotate around the boss 96, but the rotation range of the inertia plate 104 is limited by the interference of the regulating piece 112 with the inner peripheral portion of the cam passage hole 108.

  As shown in FIGS. 1 and 2, a substantially rectangular spring accommodating portion 116 is formed on the bottom wall 94 at a position displaced radially outward from the center of the bottom wall 94. A spring accommodating portion 118 is formed on the inertia plate 104 corresponding to the spring accommodating portion 116. The spring accommodating portion 116 and the spring accommodating portion 118 are opposed to each other along the axial direction of the gear 92. As shown in FIG. 2, the inertia body biasing means is provided inside both the spring accommodating portions 116 and 118. A compression coil spring 120 is arranged.

  One end of the compression coil spring 120 is held by a locking projection 122 provided on the bottom wall 94, and the other end is held by a locking projection 124 provided on the inertia plate 104. The compression coil spring 120 is compressed to generate a biasing force, and biases the inertia plate 104 in the winding direction with respect to the gear 92. For this reason, as described above, the inertia plate 104 can rotate relative to the gear 92 within a certain range until it interferes with the inner peripheral portion of the cam passage hole 108, but is compressed when the gear 92 rotates in the winding direction. Since the coil spring 120 presses the inertia plate 104 in the winding direction by its urging force, the inertia plate 104 basically rotates following the gear 92.

  On the other hand, as shown in FIGS. 1 and 2, a slider 140 is provided on the opposite side of the bottom wall 94 of the inertia plate 104. The slider 140 includes a slider main body 142. The slider body 142 is formed in a substantially truncated cone shape whose outer diameter dimension gradually decreases toward the side opposite to the inertia plate 104 (that is, the leg plate 18 side). The slider main body 142 is formed with a recess 144 that opens toward the opposite side of the inertia plate 104. The recess 144 is formed in a substantially circular shape centered on the central axis of the slider body 142.

  Further, a circular through hole 146 penetrating toward the inertia plate 104 is formed coaxially with the slider main body 142 at the bottom of the slider main body 142, and a boss 96 passes therethrough. A retainer 150 is provided on the opposite side of the slider 140 from the inertia plate 104. The retainer 150 includes a retainer main body 152. The retainer main body 152 is formed in a disk shape whose outer diameter is slightly smaller than the inner diameter of the recess 144. A boss 154 is formed on the slider 140 side of the retainer main body 152.

  The boss 154 is formed in a cylindrical shape coaxial with the retainer body 152. The outer diameter of the boss 154 is slightly smaller than the inner diameter of the through hole 146 formed in the slider 140, and the boss 154 can penetrate the through hole 146. A boss 156 is formed on the surface of the retainer main body 152 opposite to the boss 154. The boss 156 is formed in a cylindrical shape coaxial with the retainer main body 152. The boss 156 and the boss 154 communicate with each other through a hole formed in the retainer main body 152, and the shaft 82 passes through the bosses 154 and 156.

  The retainer body 152 has a pair of legs 158. These leg portions 158 extend toward the slider main body 142 side substantially parallel to the central axis of the retainer main body 152 at or near the outer peripheral portion of the retainer main body 152. A pair of through holes 160 are formed in the slider main body 142 corresponding to these leg portions 158, and a pair of through holes 162 are formed in the inertia plate 104.

When the leg portion 158 passes through the corresponding through hole 160 and further through the corresponding through hole 162, the end portion of the boss 154 comes into contact with the surface of the inertia plate 104 on the slider main body 142 side, and at the tip end of the leg portion 158. The formed engagement protrusion 164 contacts the surface of the inertia plate 104 on the bottom wall 94 (gear 92) side. As a result, the retainer 150 is connected to the inertia plate 104 substantially integrally. Further, since the leg portion 158 penetrates the through hole 160 as described above, the slider 140 is guided by the leg portion 158 and can slide along the central axis of the retainer main body 152.

On the other hand, a plurality of (three in the present embodiment) leg portions 172 are provided on the slider 140 that can be slid in this manner. These leg portions 172 are formed corresponding to the above-described cam passage holes 108, and each leg portion 172 passes through the corresponding cam passage hole 108 and further enters the corresponding hole portion 110. A cam 182 is formed inside each hole 110. The surface of the cam 182 on the side of the inertia plate 104 (the upper side in FIG. 2) is the end of the bottom wall 94 at the end in the winding direction (the direction of arrow A in FIGS. 1 and 2) around the boss 96. It is located at the same position as the surface on the 104 side or on the leg plate 16 side (lower side in FIG. 2) with respect to the surface on the inertia plate 104 side of the bottom wall 94.

  Further, the surface of the cam 182 on the side of the inertia plate 104 (the upper side in FIG. 2) gradually moves from the end on the winding direction side toward the side in the drawing direction (the direction of arrow B in FIGS. 1 and 2). The surface on the side of the inertia plate 104 at the end in the pull-out direction of each cam 182 is separated from the surface on the side of the inertia plate 104 of the bottom wall 94. Each protrusion 184 is formed so as to face the surface of the cam 182 on the side of the inertia plate 104.

  From the state shown in FIG. 3, when the inertia plate 104 rotates in the pull-out direction with respect to the gear 92, and the slider 140 rotates in the pull-out direction with respect to the gear 92, the slider body The surface of the cam 182 on the side of the inertia plate 104 presses the projection 184 in a direction in which the 142 moves away from the inertia plate 104, and as a result, the slider 140 slides as shown in FIG. 4.

  On the other hand, as shown in FIG. 1, a sensor gear 190 is provided on the leg plate 18 side of the gear 92. The sensor gear 190 is formed to have a concave cross section that opens toward the gear 92 except for a part thereof, and is supported by the shaft 82 so as to be rotatable around the shaft 82 by a shaft 82 that penetrates the bottom wall. A pawl 192 is provided inside the sensor gear 190. A circular through hole 194 is formed in the pawl 192.

  A shaft (not shown) formed inside the sensor gear 190 passes through the through hole 194. The shaft passing through the through-hole 194 has the same axial direction as the axial direction of the shaft 82 described above, and the pawl 192 has the same axial direction as the axial direction of the shaft 82 by the shaft passing through the through-hole 194. Is supported so as to be rotatable around the axis. Engagement teeth 196 are formed on one side of the pawl 192 in the radial direction of rotation from the through hole 194. When the pawl 192 rotates around the rotation axis in the winding direction, the engaging teeth 196 mesh with the ratchet teeth 102 of the gear 92. Thus, in the state where the engagement teeth 196 are engaged with the ratchet teeth 102, the rotation of the gear 92 in the winding direction is transmitted to the sensor gear 190 via the pawl 192 and the shaft supporting the pawl 192, and the sensor gear 190 is wound up. Rotate in the direction.

  Further, the engagement tooth 196 side of the pawl 192 from the through hole 194 faces the slope of the slider body 142 along the axial direction of the shaft 82, so that the slider 140 is separated from the bottom wall 94 of the gear 92. When sliding, the slope of the slider body 142 contacts the pawl 192. In this state, when the slider 140 further slides away from the bottom wall 94, the inclined surface of the slider body 142 presses the pawl 192 toward the outer side in the radial direction of the slider body 142. The pawl 192 rotates in the winding direction by the pressing force from the inclined surface of the slider body 142.

  A switching gear 212 is provided inside the sensor gear 190. A circular circular hole 214 is formed in the switching gear 212. In addition to the shaft for supporting the pawl 192, a shaft (not shown) formed inside the sensor gear 190 passes through the circular hole 214. The shaft passing through the circular hole 214 has the same axial direction as the axial direction of the shaft 82, and the switching gear 212 has the same direction as the axial direction of the shaft 82 because the shaft passes through the circular hole 214. Is supported so as to be rotatable around an axis having the axial direction as. Flat teeth are formed on the outer periphery of the switching gear 212 at regular intervals.

  Two external teeth 216 are formed on the boss 156 of the retainer 150 corresponding to the external teeth of the switching gear 212. The external teeth 216 can mesh with the external teeth of the switching gear 212. The external teeth 216 form an intermittent gear that leaves only two external teeth adjacent to each other in the circumferential direction of the boss 156 from a structure in which a plurality of external teeth are formed at equal intervals on the outer peripheral portion of the boss 156. For this reason, even if the retainer 150 rotates once around the shaft 82, the switching gear 212 rotates only by the two pitches of the external teeth. Thereby, the reduction gear ratio is larger than the structure which forms the external tooth 216 in the outer peripheral part of the boss | hub 156 at equal intervals.

  A switching member 222 is provided inside the sensor gear 190. The switching member 222 is formed by deforming a metal bar having spring properties as a whole into a predetermined shape. The switching member 222 includes a coil portion 224 whose overall shape is cylindrical. A shaft (not shown) formed inside the sensor gear 190 passes through the coil portion 224 separately from the shaft that supports the pawl 192 and the switching gear 212. The shaft passing through the coil portion 224 has the same axial direction as the axial direction of the shaft 82, and the switching member 222 has the same direction as the axial direction of the shaft 82 because the shaft passes through the coil portion 224. It is supported so as to be rotatable around an axial direction. A first arm 226 extends from one end of the switching member 222 in the coil portion 224. The distal end side (the side opposite to the coil portion 224) of the first arm 226 is bent toward the switching gear 212, and the bent portion is a gear engaging portion 228.

  Corresponding to the gear engaging portion 228, a first groove portion 230 is formed on one surface in the thickness direction of the switching gear 212 (on the side of the leg plate 18). The first groove 230 is coaxially curved with respect to the rotation center of the switching gear 212. A second groove 232 is formed on the center side of the switching gear 212 with respect to the first groove 230. The second groove portion 232 has an intermediate portion along the rotational circumferential direction of the switching gear 212 that is coaxially curved with respect to the rotation center of the switching gear 212, but is connected to the first groove portion 230 at both ends.

  The gear engaging portion 228 of the switching member 222 enters the first groove portion 230 or the second groove portion 232. When the gear engaging portion 228 moves from the first groove portion 230 to the second groove portion 232, the switching member 222 rotates in the winding direction around the shaft passing through the coil portion 224, and the gear from the second groove portion 232 to the first groove portion 230 is rotated. When the engaging portion 228 moves, the switching member 222 rotates in the pull-out direction around the shaft passing through the coil portion 224.

  Further, as described above, both ends of the second groove portion 232 are connected to the first groove portion 230, but the gear engagement from the second groove portion 232 to the first groove portion 230 at the end of the second groove portion 232 on the winding direction side. A step is formed between the first groove part 230 and the second groove part 232 so that the joint part 228 can be moved but the movement from the first groove part 230 to the second groove part 232 becomes impossible. Further, the gear engaging portion 228 can be moved from the first groove portion 230 to the second groove portion 232 at the end of the second groove portion 232 on the pulling direction side, but the movement from the second groove portion 232 to the first groove portion 230 is possible. A step is formed between the first groove portion 230 and the second groove portion 232 so as to be impossible.

  Further, the switching gear 212 is intermittently rotated by the rotation of the spool 20 being intermittently transmitted through the torsion shaft 26, the gear 50, the gear 92, and the retainer 150 due to its configuration. Here, in the fully retracted state where the spool 20 has completely wound up the webbing belt 24, the gear engaging portion 228 enters the first groove portion 230 further on the winding direction side than the end portion on the winding direction side of the second groove portion 232. , Switching so that the gear engaging portion 228 enters the first groove portion 230 further on the drawing direction side than the end portion on the drawing direction side of the second groove portion 232 in the fully drawn state where the webbing belt 24 is all pulled out from the spool 20. An initial rotation position of the gear 212 and a reduction ratio of rotation from the spool 20 to the switching gear 212 are set.

  On the other hand, the second arm 234 extends from the other end of the switching member 222 in the coil portion 224. The distal end side (the side opposite to the coil portion 224) of the second arm 234 is bent toward the switching gear 212, and the bent portion is a pawl engaging portion 236. The pawl engaging portion 236 is engaged with an engaging groove 238 formed in the pawl 192 on the side opposite to the engaging tooth 196 of the pawl 192 through the through hole 194, and around the shaft passing through the coil portion 224. When the switching member 222 rotates in the pull-out direction, the pawl engaging portion 236 presses the pawl 192 and rotates the pawl 192 in the winding direction.

  Further, an end lock preventing member 252 is provided inside the sensor gear 190. The end lock preventing member 252 is formed by deforming a metal bar having spring properties as a whole into a predetermined shape. The end lock preventing member 252 includes a mounting portion 254. The attachment portion 254 is elongated in the same direction as the axial direction of the shaft 82 and is supported by a support portion (not shown) provided inside the sensor gear 190 so as to be rotatable around an axis whose longitudinal direction is the axial direction. ing. The end lock preventing member 252 includes a sliding contact portion 256.

  The sliding contact portion 256 is in sliding contact with the outer surface of the retainer 150, and when the retainer 150 rotates, the end lock preventing member 252 rotates according to the rotation of the retainer 150 due to friction with the retainer 150. Further, the end lock preventing member 252 includes a restricting portion 258. The restricting portion 258 approaches the portion of the pawl 192 closer to the engaging tooth 196 than the through hole 194 when the end lock preventing member 252 rotates in the winding direction. When the pawl 192 is not rotated in the winding direction, that is, when the engaging teeth 196 of the pawl 192 are not engaged with the ratchet teeth 102 of the gear 92, the end lock preventing member 252 is rotated in the winding direction. When the restricting portion 258 approaches a portion of the pawl 192 closer to the engaging tooth 196 than the through hole 194, the restricting portion 258 engages with the pawl 192 in the vicinity of the engaging tooth 196.

  However, since the force for rotating the end lock preventing member 252 is a frictional force between the sliding contact portion 256 and the retainer 150, the pawl engaging portion 236 of the switching member 222 rotates the pawl 192 in the winding direction. In the state of being moved, the frictional force between the sliding contact portion 256 and the retainer 150 cannot resist the pressing force applied by the pawl engaging portion 236 (or so that it cannot be resisted in this way). The coefficient of friction between the sliding contact portion 256 and the retainer 150 is set).

  As described above, when the restricting portion 258 is engaged with the pawl 192, the turning of the pawl 192 in the winding direction is restricted by the restricting portion 258. For this reason, the engaging teeth 196 of the pawl 192 cannot mesh with the ratchet teeth 102 of the gear 92. As a result, for example, the engagement teeth 196 of the pawl 192 mesh with the ratchet teeth 102 of the gear 92 in the fully retracted state where the spool 20 has completely wound up the webbing belt 24, and the withdrawal of the webbing belt 24 from the spool 20 is restricted. The so-called “end lock” can be prevented or effectively suppressed.

  As described above, the guide groove 272 is formed in the sensor gear 190 provided with the pawl 192, the switching gear 212, and the like. A pin 273 is formed on the lock pawl 72 corresponding to the guide groove 272. The pin 273 is formed closer to the tooth portion 76 than the rotation center of the lock pawl 72 (that is, the passing position of the shaft 74). The protruding direction of the pin 273 from the lock pawl 72 is the same as the axial direction of the shaft 82, and the tip end side enters the guide groove 272. Of the inner wall constituting the guide groove 272, the portion facing the pin 273 is appropriately curved around an axis whose axial direction is the same as the axial direction of the shaft 82, and when the sensor gear 190 rotates in the winding direction. The inner wall of the guide groove 272 presses the pin 273, and the lock pawl 72 is rotated so that the tooth portion 76 approaches the ratchet teeth of the lock base 34.

  A holding projection 274 is formed on the outer periphery of the sensor gear 190. The holding projection 274 enters one end of a compression coil spring 276 as a release biasing means. The other end of the compression coil spring 276 is locked to the inner housing 70. When the sensor gear 190 rotates in the winding direction, the compression coil spring 276 is compressed and biases the sensor gear 190 in the pull-out direction.

  On the other hand, an acceleration sensor 290 is provided in the outer housing 60 on the side opposite to the sensor gear 190 via the leg plate 18 (that is, outside the leg plate 18). The acceleration sensor 290 includes a pedestal 292 that is held by the outer housing 60. The pedestal 292 is formed with a concave curved surface 294 that opens substantially upward. A ball 296 as an inertial mass body for an acceleration sensor is placed in the curved surface 294. When the vehicle suddenly decelerates, the ball 296 moves inertially and ascends the curved surface 294 against the inclination of the curved surface 294. .

  From the end portion of the base 292 on one side in the substantially vehicle left-right direction, a vertical wall 298 is formed in which the upper end is bent like a bowl toward the other side in the vehicle left-right direction. Both ends of the shaft 300 whose axial direction is substantially in the vehicle front-rear direction are rotatably supported at the upper end of the vertical wall 298. The shaft 300 is provided with a plate 302. The plate 302 has a circular shape in a plan view and a curved surface curved in a concave shape opened downward. The plate 302 covers the ball 296. When the ball 296 rises against the inclination of the curved surface 294 as described above, the plate 302 is lifted by the ball 296, and the shaft 300 rotates around its own axis. .

  The shaft 300 is provided with an arm 304. The arm 304 passes through an opening 306 formed in the sensor gear 190 and enters the sensor gear 190. When the plate 302 is lifted by the ball 296 and the shaft 300 is rotated, the arm 304 is rotated together with the shaft 300. When the arm 304 rotates in this manner, the arm 304 engages with the pawl 192 and presses and rotates the pawl 192 in a direction approaching the ratchet teeth 102 of the gear 92.

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

  In the webbing retractor 10, when an occupant seated in a vehicle seat pulls a tongue (not shown) provided on the webbing belt 24, the webbing belt 24 wound around the spool body 22 is pulled out. When the webbing belt 24 pulled out in this way is hung around the occupant's body and the tongue is attached to, for example, a buckle provided on the side of the seat, the webbing belt 24 is attached to the occupant's body. It becomes a state.

(Operation as ELR mechanism based on VSIR function)
When the vehicle suddenly decelerates while the webbing belt 24 is attached to the occupant's body, the ball 296 of the acceleration sensor 290 rolls on the curved surface 294 substantially forward of the vehicle due to inertia. Thus, when the ball 296 moves up the curved surface 294, the ball 296 lifts the plate 302 and rotates the arm 304 together with the plate 302. When the arm 304 is thus rotated, the arm 304 is engaged with the pawl 192, and the pawl 192 is rotated in a direction in which the engaging teeth 196 approach the ratchet teeth 102 of the gear 92. When the pawl 192 rotates in this manner, the engaging teeth 196 engage with the ratchet teeth 102 of the gear 92.

  On the other hand, when the vehicle body suddenly decelerates and the occupant's body attempts to move inertially toward the front side of the vehicle, the webbing belt 24 attached to the occupant's body is pulled by the occupant's body. When the pulling force is applied to the webbing belt 24 in this way and the spool body 22 rotates in the pull-out direction, the rotation of the spool body 22 is transmitted to the gear 92 via the gear 50 and rotates the gear 92 in the winding direction.

  When the engagement teeth 196 of the pawl 192 are engaged with the ratchet teeth 102 of the gear 92, the rotation of the gear 92 in the winding direction is transmitted to the sensor gear 190 through the pawl 192, and the sensor gear 190 is moved in the winding direction. Rotate. When the sensor gear 190 rotates in the winding direction against the urging force of the compression coil spring 276, the inner wall of the guide groove 272 formed in the sensor gear 190 presses the pin 273 provided on the lock pawl 72 to lock the lock pawl 72. Is rotated in the winding direction.

  When the lock pawl 72 rotates in the winding direction in this manner and the tooth portion 76 of the lock pawl 72 engages with the ratchet teeth formed on the outer peripheral portion of the lock base main body 36, the lock base 34 moves in the pull-out direction. The rotation is restricted by the teeth 76 of the lock pawl 72. As described above, the rotation of the lock base 34 in the pull-out direction is restricted, so that the rotation of the spool body 22 in the pull-out direction via the torsion shaft 26 is restricted.

(Operation as ELR mechanism based on WSIR function)
On the other hand, when the body of an occupant who is about to move inertially forward by the vehicle decelerating rapidly pulls the webbing belt 24, the spool 20 rapidly rotates in the pull-out direction. As described above, the rotation of the spool 20 in the pull-out direction is transmitted to the gear 92 via the gear 50, and the gear 92 is rapidly rotated in the winding direction.

  When the gear 92 rotates, the inertia plate 104 basically rotates following the gear 92. However, if the gear 92 is suddenly rotated in the winding direction, the inertia plate 104 cannot follow the rotation of the gear 92 due to inertia, and as a result, the biasing force of the compression coil spring 120 is generated between the inertia plate 104 and the gear 92. Relative relative rotation occurs. In this case, the rotation of the gear 92 in the winding direction with respect to the inertia plate 104 means that the inertia plate 104 rotates relative to the gear 92 in the pull-out direction.

  When such relative rotation occurs between the gear 92 and the inertia plate 104, the cam 182 of the gear 92 pushes up the protrusion 184 from the state shown in FIG. 3 as shown in FIG. Accordingly, the slider 140 is guided by the leg portion 158 and slides so as to be separated from the bottom wall 94 of the gear 92. As described above, when the slider 140 slides away from the bottom wall 94 of the gear 92, the slope of the slider body 142 (slider 140) abuts against the pawl 192 and presses the pawl 192. Thus, the pawl 192 pressed against the slope of the slider main body 142 rotates, and the engagement teeth 196 engage with the ratchet teeth 102 of the gear 92.

  In this state, as already described, the sensor gear 190 rotates in the winding direction together with the gear 92, and the inner wall of the guide groove 272 formed in the sensor gear 190 presses the pin 273 provided on the lock pawl 72 to lock it. The pawl 72 is rotated in the winding direction. As a result, the tooth portion 76 of the lock pawl 72 engages with the ratchet teeth of the lock base 34, and the rotation of the lock base 34 in the pull-out direction, and hence the rotation of the spool body 22 in the pull-out direction is restricted.

  As described above, in the webbing take-up device 10, in any case where the vehicle is suddenly decelerated and the acceleration sensor 290 is activated or the spool 20 is suddenly rotated in the pull-out direction, The webbing belt 24 is restricted from being pulled out, and the webbing belt 24 firmly holds the body of the occupant of the vehicle and restricts the occupant's body from moving substantially forward of the vehicle.

(Operation as ALR mechanism)
When the webbing belt 24 is hung around a load other than the occupant such as a child seat placed on the seat, and the load is fixed on the seat with the webbing belt 24, first, all of the spool body 22 (spool 20) is used. The webbing belt 24 is pulled out. As described above, the rotation of the spool 20 in the pull-out direction is transmitted to the gear 92 via the gear 50 and rotates the gear 92 in the winding direction. The rotation of the gear 92 in the winding direction is further transmitted to the retainer 150 and rotates the retainer 150 in the winding direction.

  Since the external teeth 216 formed on the boss 156 of the retainer 150 can mesh with the external teeth of the switching gear 212, when the retainer 150 rotates and the external teeth 216 mesh with the switching gear 212, the switching gear 212 is intermittently engaged. Rotates in the pulling direction. Since both end portions of the second groove portion 232 along the circumferential direction of the switching gear 212 are connected to the first groove portion 230, when the spool 20 rotates in the pull-out direction until all the webbing belts 24 are pulled out from the spool body 22, The gear engaging portion 228 that has entered the second groove portion 232 enters the first groove portion 230 from the end of the second groove portion 232 on the winding direction side.

  As described above, when the gear engaging portion 228 moves to the first groove portion 230, the switching member 222 rotates in the pull-out direction around the shaft (not shown) entering the coil portion 224. When the switching member 222 rotates in the pull-out direction, the pawl engaging portion 236 presses the pawl 192 and engages the engaging teeth 196 with the ratchet teeth 102 of the gear 92. As described above, when the spool 20 tries to rotate in the pull-out direction with the engaging teeth 196 of the pawl 192 engaged with the ratchet teeth 102 of the gear 92, the teeth 76 of the lock pawl 72 are moved to the lock base 34. The lock base 34 and thus the rotation of the spool 20 in the pull-out direction is restricted by meshing with the ratchet teeth.

  Moreover, when the pawl engaging portion 236 presses the pawl 192 and the engaging teeth 196 are engaged with the ratchet teeth 102 of the gear 92, the pressing force from the pawl engaging portion 236 applied to the pawl 192 is eliminated. The rotation restriction of the spool 20 in the pull-out direction is continued until it is done. For this reason, in this state, the webbing belt 24 cannot be pulled out of the spool 20 regardless of the state of the vehicle and the like. The load can be firmly fixed.

  Even when the load on the seat is fixed by the webbing belt 24, the tongue provided on the webbing belt 24 is attached to the buckle. When the tongue is removed from the buckle and the webbing belt 24 is wound around the spool 20 until the webbing belt 24 cannot be wound around the spool 20 until the so-called “full storage state”, the second groove 232 of the first groove 230 The gear engaging portion 228 is positioned slightly on the drawing direction side from the portion connected to the end portion on the drawing direction side.

  In this state, when the webbing belt 24 is pulled to rotate the spool 20 in the pull-out direction, the gear engaging portion 228 moves from the first groove portion 230 to the second groove portion 232, and the switching member 222 rotates in the winding direction side. . Thereby, the application of the pressing force from the pawl engaging portion 236 to the pawl 192 is canceled, and the pawl 192 rotates in the pull-out direction. Thus, when the pawl 192 rotates in the pull-out direction, the meshing between the engaging teeth 196 of the pawl 192 and the ratchet teeth 102 of the gear 92 is released. Thereby, the rotation transmission from the gear 92 to the sensor gear 190 is canceled, and the sensor gear 190 is rotated in the pull-out direction by the urging force of the compression coil spring 276.

  As the sensor gear 190 rotates in the pull-out direction in this manner, the pin 273 is pressed against the inner wall of the guide groove 272 and the lock pawl 72 rotates in the pull-out direction. As the lock pawl 72 rotates in the pull-out direction, the meshing between the teeth 76 of the lock pawl 72 and the ratchet teeth of the lock base 34 is eliminated. As a result, the restriction on the rotation of the lock base 34 in the pull-out direction and the restriction on the rotation of the spool 20 in the pull-out direction are eliminated, and the webbing belt 24 can be pulled out from the spool body 22. Therefore, when the webbing take-up device 10 is returned to the fully retracted state, the rotation of the lock base 34 in the pull-out direction is not inadvertently restricted, and the occurrence of such inadvertent rotation restriction occurs. Can be effectively reduced.

(Specific actions and effects of the webbing retractor 10)
As described above, the webbing take-up device 10 has both an ELR function based on both VSIR and WSIR and an ALR function, and inadvertently locks in the pull-out direction in all stored states. It is possible to prevent or suppress the rotation of the base 34 from being restricted. That is, in terms of function, the webbing take-up device 10 has the function of a conventional webbing take-up device.

  Here, in the webbing take-up device 10 according to the present embodiment, the spool 50 is provided between the leg plate 18 and the leg plate 16 and along the rotational radius direction of the spool 20 by the gear 50 provided in the spool body 22. The rotation of the spool 20 can be transmitted to the gear 92 provided below (side). For this reason, the operating force of the acceleration sensor 290 including the gear 92 and the rotational force in the winding direction applied to the lock pawl 72 in conjunction with the rotation of the spool 20 in the pulling direction when the spool 20 suddenly rotates in the pulling direction. And a structure for maintaining the pawl 192 rotated in the winding direction with all the webbing belts 24 being pulled out from the spool body 22 of the spool 20. In addition, it can be provided below (side) the spool 20 along the rotational radius direction of the spool 20.

  As a result, the overall dimension along the axial direction of the spool 20 is shortened as compared with the conventional webbing take-up device in which these configurations are sequentially arranged on the side of the spool 20 along the rotational axis direction of the spool 20. it can. In addition, the lower portion of the spool 20 between the leg plate 16 and the leg plate 18 is a portion that is likely to be a so-called dead space, and the space between the leg plate 16 and the leg plate 18 can be arranged in this portion by arranging the above-described configuration. Can be effectively used as a member mounting space, and as a result, the overall size reduction of the webbing take-up device 10 can be achieved.

<Configuration of Second Embodiment>
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the same reference numerals are assigned to the same parts as those in the first embodiment, and the detailed description thereof is omitted.

  FIG. 6 is an exploded perspective view showing the entire configuration of a lock mechanism 402 as a lock means, which is a main part of a webbing take-up device 400 according to a second embodiment of the present invention.

  As shown in this figure, the lock mechanism 402 of the webbing take-up device 400 is not provided with a gear 50 between the end of the spool body 22 on the leg plate 18 side and the lock base 34, and instead has two steps. A gear 404 is provided. The two-stage gear 404 accommodated in the inner housing 70 (not shown in FIG. 6) includes a first gear portion 406 as an output side transmission gear. The first gear portion 406 is an external spur gear coaxial with the lock base body 36 of the lock base 34 and the spool body 22 (not shown in FIG. 6).

  A gear 408 as an input side transmission gear is provided below the first gear portion 406 along the vertical direction of the webbing take-up device 10. A shaft 410 is provided in the inner housing 70 corresponding to the gear 408. The shaft 410 is supported by, for example, at least one of the leg plate 18 and the inner housing 70 in a state where the axial direction is parallel to the axial direction of the spool 20 (same direction). The gear 408 is rotatably supported on the shaft 410. A boss 412 is coaxially formed with respect to the gear 408 on one end face of the gear 408 in the axial direction (the leg plate 16 side).

  The boss 412 is formed with the external teeth 216 formed on the boss 156 of the retainer main body 152 in the first embodiment. Further, a switching gear 212 is provided on one side in the axial direction of the gear 408 and on the side of the boss 412 along the rotational radius direction of the gear 408 with respect to the axial direction of the spool 20 on the support shaft 414 provided in the inner housing 70. Are supported so as to be rotatable around an axis whose parallel direction is the axial direction. As in the first embodiment, the external teeth formed on the outer periphery of the switching gear 212 can mesh with the external teeth 216.

  A switching member 418 instead of the switching member 222 is provided on the shaft 416 formed on the inner housing 70 so as to protrude in a direction parallel to the axial direction of the spool 20. The switching member 418 includes a coil portion 224 similar to the switching member 222, and the switching member 418 is provided on the shaft 416 so that the shaft 416 enters the coil portion 224.

  Further, a first arm 226 is formed from the coil portion 224 of the switching member 418, and the gear engaging portion 228 formed at the tip of the first arm 226 is the same as that of the switching gear 212 not shown in FIG. Like the first embodiment, the gear engaging portion 228 moves inside the first groove portion 230 or the second groove portion 232 as the switching gear 212 rotates, as in the first embodiment. Then, when the gear engaging portion 228 moves from one of the first groove portion 230 and the second groove portion 232 to the other, the switching member 418 rotates around the shaft 416.

  On the other hand, the second arm 234 is not formed on the switching member 418, and a second arm 420 is formed instead. The second arm 420 passes through the other side of the gear 408 in the axial direction (that is, the surface opposite to the side on which the boss 412 is formed), and the tip side further extends along the axial direction of the gear 408. The gear 408 is bent in a direction away from the other surface in the axial direction. The distal end side of the second arm 420 bent in this way is a sensor engaging portion 422.

  The sensor engaging portion 422 passes through a long hole 426 formed in the leg plate 18 and protrudes on the opposite side of the leg plate 18 from the leg plate 16. A sensor mounting portion 428 is formed in the vicinity of the long hole 426 on the surface of the leg plate 18 opposite to the leg plate 16. The sensor mounting portion 428 is mounted with a base 292 of an acceleration sensor 430 that replaces the acceleration sensor 290. In the acceleration sensor 430, a claw portion 432 projects outwardly from the rotation radius of a part of the outer periphery of the shaft 300 that can be rotated around an axis whose axial direction is substantially the same as the axial direction of the spool 20. It is formed as follows.

  The claw portion 432 is engageable with the sensor engaging portion 422 that has passed through the long hole 426, and the switching member 418 is moved when the gear engaging portion 228 moves from the second groove portion 232 to the first groove portion 230. The sensor engaging portion 422 presses the claw portion 432 by the rotation. By pressing the claw portion 432 against the sensor engaging portion 422 in this manner, the plate 302 rotates around the shaft 300 and rises without being pushed up by the ball 296.

  On the other hand, as shown in FIG. 6, a slider guide 442 is provided on the surface of the leg plate 18 opposite to the leg plate 16. The slider guide 442 is attached to the leg plate 18 by a support shaft 444 that rotatably supports the lock pawl 72 about an axis whose axial direction is the same as the axial direction of the spool 20. A spring engaging portion 446 is disposed on the side of the slider guide 442 along the rotational radius direction of the spool 20. In addition, a slider 448 is provided on the side opposite to the spring engaging portion 446 via the leg plate 18.

  The slider 448 and the spring engaging portion 446 are integrally connected so as to straddle the inner peripheral edge of the opening formed in the leg plate 18. An engagement piece 452 is formed on the slider 448. A guide hole 454 is formed in the leg plate 18 corresponding to the engagement piece 452, and the engagement piece 452 enters the guide hole 454. The guide hole 454 is curved with the center axis of the spool 20 as the center of curvature, so that the engagement piece 452 can be rotated around the center axis of the spool 20 by being guided by the guide hole 454.

  One end of the compression coil spring 456 is engaged with the spring engaging portion 446 that is integrally connected to the slider 448. The other end of the compression coil spring 456 is engaged with the slider guide 442, and the compression coil spring 456 is compressed when the spring engagement portion 446 rotates together with the slider 448 in the drawing direction (arrow B direction in FIG. 6). The spring engaging portion 446 is biased in the winding direction (the direction of arrow A in FIG. 6).

  On the other hand, as shown in FIG. 6, the pin 273 is not formed on the lock pawl 72 of the lock mechanism 402 (the webbing take-up device 400), and a pin 458 is formed instead. The pin 458 is formed at a position spaced from the rotation center of the lock pawl 72 to the outer side in the rotation radial direction of the lock pawl 72, and is directed from the lock pawl 72 toward the leg plate 16 in the same direction as the axial direction of the spool 20. Protruding. Thus, the pin 458 formed on the lock pawl 72 passes through the opening 450, and the tip of the pin 458 enters the guide groove 460 formed on the slider 448.

  As described above, the slider 448 is rotatable around the central axis of the spool 20, and when the slider 448 rotates in the drawing direction (the direction of arrow B in FIG. 6), the inner wall of the guide groove 460 causes the pin 458 to move. Press. When the pin 458 is pressed against the inner wall of the guide groove 460 in this manner, the lock pawl 72 rotates around the support shaft 444, and the tooth portion 76 (lock pawl 72) moves to the lock base body 36 (lock base 34). It meshes with ratchet teeth formed on the outer periphery. Further, when the slider 448 rotated in the drawing direction is rotated in the winding direction (the direction of arrow A in FIG. 6) by the urging force of the compression coil spring 456, the inner wall of the guide groove 460 presses the pin 458, and the tooth portion 76. The lock pawl 72 rotates so as to be separated from the ratchet teeth of the lock base body 36.

  On the other hand, a pawl 472 is provided on the side of the leg plate 16 of the slider 448. The pawl 472 is formed with a fitting insertion hole 474 that opens toward the slider 448 side. A shaft (not shown) protrudes from the surface of the leg plate 16 side of the slider 448 corresponding to the fitting insertion hole 474 and is fitted in the fitting insertion hole 474. Thus, the shaft formed on the slider 448 is fitted into the fitting insertion hole 474, so that the pawl 472 supports the slider 448 so as to be rotatable about an axis whose axial direction is the same as the axial direction of the spool 20. Has been. Further, a tooth portion 476 is formed in the fitting insertion hole 474.

  The tooth portion 476 is a V gear portion 478 formed integrally with the first gear portion 406 on the lock base 34 side of the first gear portion 406 (that is, the V gear portion 478 constituting the two-stage gear 404 together with the first gear portion 406). ) On the side of the outer periphery. Ratchet teeth are formed on the outer peripheral portion of the V gear portion 478. When the pawl 472 rotates in the winding direction with respect to the slider 448, the tooth portion 476 approaches the outer peripheral portion of the V gear portion 478, and V The gear portion 478 meshes with the ratchet teeth.

  If the two-stage gear 404 rotates in the winding direction, the V gear portion 478 slides on the ratchet teeth of the V gear portion 478 and the V gear portion 478 does not rotate with the pawl 472. However, if the two-stage gear 404 is rotating in the pull-out direction, the ratchet teeth of the V-gear part 478 press the tooth part 476 in the pull-out direction, so that it is around the center axis of the two-stage gear 404 (that is, around the center axis of the spool 20). ) To rotate the pawl 472 in the pull-out direction. As described above, since the pawl 472 is connected to the slider 448, when the pawl 472 rotates in the pull-out direction along with the V gear portion 478 (two-stage gear 404), the slider 448 rotates in the pull-out direction. . Thereby, the tooth | gear part 76 (lock pawl 72) meshes | engages with the ratchet tooth formed in the outer peripheral part of the lock base main body 36 (lock base 34).

  On the other hand, a pressure receiving plate 492 is formed on the pawl 472. The pressure receiving plate 492 is formed on the side opposite to the tooth portion 476. The pressure receiving plate 492 faces the tip side of the arm 304 that has passed through the opening 450. For this reason, when the plate 302 rises and rotates around the shaft 300, the arm 304 presses the pressure receiving plate 492 and rotates the pawl 472 in a direction in which the tooth portion 476 approaches the outer peripheral portion of the V gear portion 478.

  On the other hand, a gear holder 502 is provided on the side of the gear 408 along the rotational radius direction of the gear 408 described above. The gear holder 502 includes a bottom plate 504 whose thickness direction is along the axial direction of the spool 20. A support shaft 506 whose axial direction is the same as the axial direction of the spool 20 is formed from the surface of the bottom plate 504 opposite to the leg plate 16. A peripheral wall 508 is formed on at least a part of the outer peripheral portion of the bottom plate 504 excluding the gear 408 side along the rotational radius direction of the gear 408. The peripheral wall 508 is curved so that the support shaft 506 is the center of curvature, and is erected in the same direction as the direction in which the support shaft 506 protrudes from the bottom plate 504.

  A bearing portion 510 is formed on the peripheral wall 508. The bearing portion 510 is formed in a bottomed cylindrical shape whose axial direction is along the axial direction of the spool 20 and whose end opposite to the leg plate 16 is closed. A support shaft 512 formed in the inner housing 70 is inserted into the bearing portion 510, and the bearing portion 510, and thus the gear holder 502, rotates around the support shaft 512, that is, in the same direction as the axial direction of the spool 20 by the support shaft 512. It is supported so as to be rotatable around an axis as a direction.

  In addition, a spring locking portion 514 is formed on the bearing portion 510, and one end of a tension coil spring 516 is locked on the spring locking portion 514. The other end of the tension coil spring 516 is locked to a spring locking portion formed in the inner housing 70 (not shown). When the gear holder 502 rotates around the support shaft 512 in the pulling direction, the tension coil spring 516 is compressed. The biasing force of the tension coil spring 516 thus increased biases the gear holder 502 in the winding direction.

  Further, the gear holder 502 is provided with a trigger lever 518. The trigger lever 518 has a through hole 520 through which the vicinity of the tip of the support shaft 506 passes, and a mounting portion 522 that is mounted on the bearing portion 510 so as to cover the bearing portion 510 from the outside. In addition, a mounting wall 524 is formed in a portion of the trigger lever 518 that is spaced apart from the mounting wall 524 by a certain angle around the through hole 520. The mounting portion 522 has a notch 526 that opens toward the opposite side of the leg plate 16 along the axial direction of the support shaft 512, and the mounting wall 524 has a substantially rectangular opening 528. .

  When the trigger lever 518 is attached to the gear holder 502, the vicinity of the distal end portion of the support shaft 506 is inserted into the through hole 520 and the attachment portion 522 is attached to the bearing portion 510. Thus, in a state where the mounting portion 522 is mounted on the bearing portion 510, the interference claw 530 formed on the bearing portion 510 interferes with the inner edge of the notch 526, and the interference claw 532 formed on the peripheral wall 508 is an opening. 528 enters and interferes with the inner periphery of the opening 528. Thereby, the trigger lever 518 is fixed to the gear holder 502.

  A lever portion 534 extends from the trigger lever 518 toward the pawl 472. The distal end portion of the lever portion 534 faces the pressure receiving portion 536 formed in the vicinity of the tooth portion 476 of the pawl 472, and when the trigger lever 518 rotates around the support shaft 512 together with the gear holder 502, the lever portion 534. The tip of the pressure sensor approaches the pressure receiving portion 536. In this way, when the lever portion 534 approaches the pressure receiving portion 536 and the lever portion 534 presses the pressure receiving portion 536, the pawl 472 is rotated in a direction in which the tooth portion 476 approaches the outer peripheral portion of the V gear portion 478.

  On the other hand, an inertia mass body 544 is provided in the gear holder 502. The inertia mass body 544 is formed in a disk shape coaxial with the support shaft 506 and is rotatably supported by the support shaft 506. A gear 546 is formed coaxially with the inertia mass body 544 on the surface of the inertia mass body 544 opposite to the bottom plate 504. The gear 546 is an external spur gear having a sufficiently smaller number of teeth than the gear 408 and meshes with the gear 408.

  As described above, the inertia mass body 544 in which the gear 546 is coaxially and integrally formed has the same direction as the axial direction of the spool 20, and thus around the axis whose axial direction is the same direction as the axial direction of the shaft 410. Since the gear 408 rotates, the gear 546 rotates around the support shaft 506 in the direction opposite to the rotation direction of the gear 408 and tries to revolve around the gear 408 when the gear 408 rotates.

  However, the mass of the inertia mass body 544 is added to the gear 546 in addition to its own weight, and the mass of the gear holder 502 is added. The gear 546 does not revolve until the gear 408 rotates at an acceleration of a certain magnitude or more due to the inertia based on these masses and the urging force of the tension coil spring 516.

  On the other hand, a mounting cylinder 550 is provided in the inner housing 70 (not shown) in the vicinity of the support shaft 512. The mounting cylinder 550 is formed in a cylindrical shape that opens in the direction opposite to the leg plate 16 along the axial direction of the spool 20, and the mounting portion 554 of the end lock preventing member 552 is attached to the mounting cylinder 550 in the axial direction of the spool 20. Is supported so as to be rotatable about an axis whose axial direction is the same direction as the axis. The end lock preventing member 552 is formed by deforming a metal bar having a spring property as a whole into a predetermined shape in the same manner as the end lock preventing member 252 in the first embodiment.

  An engaging portion 556 that is bent in a concave shape is formed from the tip of the mounting portion 554. The engaging portion 556 enters the inside of the pressure receiving portion 558 formed on the peripheral wall 508 of the gear holder 502, and when the end lock preventing member 552 rotates in the winding direction around the mounting portion 554, the engaging portion 556 becomes the pressure receiving portion. The inner wall of 558 is pressed in the winding direction. Further, a sliding contact portion 560 is continuously formed from an end portion of the engaging portion 556 opposite to the attachment portion 554. The sliding contact portion 560 is in sliding contact with the surface of the gear 408 on the leg plate 16 side, and when the gear 408 rotates in the pull-out direction, the sliding contact portion 560, that is, the end lock preventing member 552 is caused by friction with the gear 408. It is designed to rotate.

  As the end lock preventing member 552 rotates in the winding direction by the rotation of the gear 408 in the pull-out direction, the engaging portion 556 presses the inner wall of the pressure receiving portion 558 in the winding direction. This restricts the rotation of the gear holder 502 in the pull-out direction when the gear 408 rotates in the pull-out direction, that is, when the spool 20 rotates in the winding direction.

<Operation and Effect of Second Embodiment>
Next, the operation and effect of the webbing take-up device 400 will be described through the description of the operation of the webbing take-up device 400.

  In the present webbing take-up device 400, when the spool 20 rotates in the pull-out direction by pulling the webbing belt 24 and pulling out the webbing belt 24 wound on the spool 20, the rotation of the spool 20 in the pull-out direction causes the torsion shaft 26 to rotate. Is transmitted to the two-stage gear 404, and the two-stage gear 404 is rotated in the pull-out direction (the direction of arrow B in FIG. 6).

  The two-stage gear 404 rotated in the pull-out direction transmits the rotation to the gear 408 meshing with the first gear portion 406 of the two-stage gear 404 to rotate the gear 408 in the winding direction (arrow A direction in FIG. 6). The gear 546 that meshes with the gear 408 is rotated in the pull-out direction. However, when the occupant pulls the webbing belt 24 in order to wear the webbing belt 24 and the rotational force in the pull-out direction applied to the spool 20 is less than a predetermined magnitude, the rotational force of the gear 408 is reduced. The received compression coil spring 456 does not revolve around the gear 408 due to the mass of the gear 408 described above, but rotates around the gear 408 in the pull-out direction.

  Therefore, in this state, the trigger lever 518 does not rotate around the support shaft 512, and the pressure receiving portion 536 is not pressed against the lever portion 534 of the trigger lever 518. For this reason, in this state, the tooth portion 476 does not mesh with the ratchet teeth of the V gear portion 478. Therefore, the slider 448 rotates the lock pawl 72 in a direction to mesh with the ratchet teeth of the lock base body 36 (lock base 34). It will never be done. Thereby, in this state, the lock base 34 can rotate in the pull-out direction, and the webbing belt 24 can be pulled out from the spool 20.

(Operation as ELR mechanism based on VSIR function)
As described in the first embodiment, when the ball 296 of the acceleration sensor 430 rolls on the curved surface 294 substantially to the front side of the vehicle due to inertia when the vehicle suddenly decelerates, the ball 296 becomes a plate. 302 is lifted and the arm 304 is rotated together with the plate 302. Thus, when the arm 304 rotates, the pressure receiving plate 492 is pressed. The pawl 472 whose pressure receiving plate 492 is pressed by the arm 304 rotates in the winding direction with respect to the slider 448 so that the tooth portion 476 approaches the outer peripheral portion of the V gear portion 478. Thereby, the tooth part 476 meshes with the ratchet tooth formed on the outer peripheral part of the V gear part 478.

  On the other hand, if the occupant's body pulls the webbing belt 24 due to the sudden deceleration of the vehicle as described above, and the two-stage gear 404 rotates together with the spool 20 in the pull-out direction, the teeth on the ratchet teeth of the first gear portion 406 The pawl 472 engaged with the portion 476 also rotates in the pull-out direction along with the two-stage gear 404. As described above, the pawl 472 rotates in the pull-out direction along with the two-stage gear 404, so that the slider 448 on which the pawl 472 is supported also rotates in the pull-out direction. When the slider 448 rotates in the pull-out direction, the inner wall of the guide groove 460 presses the pin 458 of the lock pawl 72 to rotate the lock pawl 72 around the support shaft 444 in the winding direction.

  When the lock pawl 72 rotates in the winding direction, the tooth portion 76 meshes with the ratchet teeth formed on the outer peripheral portion of the lock base main body 36 (lock base 34). As a result, the rotation of the lock base 34 in the pull-out direction, and hence the rotation of the spool 20 in the pull-out direction, is restricted, and the withdrawal of the webbing belt 24 from the spool 20 is restricted. In this way, by restricting the withdrawal of the webbing belt 24 from the spool 20, the occupant's body is strongly restrained by the webbing belt 24, and inertial movement toward the vehicle front side is prevented or effectively suppressed.

(Operation as ELR mechanism based on WSIR function)
On the other hand, as described in the first embodiment, when the vehicle suddenly decelerates, the occupant's body suddenly pulls the webbing belt 24, thereby causing the spool 20 to rapidly rotate in the pull-out direction. Thus, when the acceleration of the rotation of the gear 408 in the winding direction exceeds a certain magnitude, the gear 546 tries to revolve around the gear 408 while rotating. The inertia mass body 544 integrated with the gear 546 is supported by the support shaft 506 of the gear holder 502, and the gear holder 502 is supported by the support shaft 512. Therefore, the rotation other than the rotation of the gear 546 to be revolved is the support shaft. Restrained by rotation around 512.

  Therefore, when the gear 546 tries to revolve, the gear holder 502 is rotated around the support shaft 512 in the pull-out direction along with the gear 546. When the gear holder 502 rotates in the pull-out direction, the trigger lever 518 mounted on the gear holder 502 rotates in the pull-out direction around the support shaft 512, so that the tip of the lever portion 534 presses the pressure receiving portion 536. The pawl 472 having the pressure receiving portion 536 pressed against the lever portion 534 rotates in the winding direction with respect to the slider 448, whereby the tooth portion 476 meshes with the ratchet teeth formed on the outer peripheral portion of the V gear portion 478. .

  In this state, the V gear portion 478 (that is, the two-stage gear 404) rotates in the pull-out direction, so that the pawl 472 and the V gear portion 478 are pulled in the pull-out direction when the tooth portion 476 meshes with the ratchet teeth of the V gear portion 478. To turn. As described above, the pawl 472 rotates in the pull-out direction, so that the tooth portion 76 is formed on the outer peripheral portion of the lock base main body 36 (lock base 34) in the same manner as the “operation as an ELR mechanism based on the VSIR function” described above. The ratchet teeth are engaged with each other, and the withdrawal of the webbing belt 24 from the spool 20 is restricted.

  As described above, in the webbing take-up device 10, in any case where the vehicle is suddenly decelerated and the acceleration sensor 290 is activated or the spool 20 is suddenly rotated in the pull-out direction, The webbing belt 24 is restricted from being pulled out, and the webbing belt 24 firmly holds the body of the occupant of the vehicle and restricts the occupant's body from moving substantially forward of the vehicle.

  On the other hand, as described above, when the gear holder 502 rotates in the pull-out direction, the lever portion 534 presses the pressure receiving portion 536 to engage the tooth portion 476 of the pawl 472 with the ratchet teeth of the V gear portion 478, but the spool 20 When rotating in the winding direction, the engaging portion 556 of the end lock preventing member 552 rotated in the winding direction by friction with the gear 408 presses the inner wall of the pressure receiving portion 558 in the winding direction, and moves in the drawing direction. Since the rotation of the gear holder 502 is restricted, the rotation of the trigger lever 518 is also restricted.

  For this reason, when the spool 20 rotates in the winding direction, the lever portion 534 does not press the pressure receiving portion 536, and accordingly, when the webbing belt 24 is wound by the spool 20, the lever portion 534 moves in the drawing direction. The rotation of the V gear portion 478 (that is, the two-stage gear 404) is not restricted by the pawl 472. Accordingly, it is possible to prevent the occurrence of so-called “end lock” in which the pawl 472 is inadvertently engaged with the V gear portion 478 in a state where the winding of the webbing belt 24 by the spool 20 is finished, and the withdrawal of the webbing belt 24 is restricted. .

(Operation as ALR mechanism)
The operation of the webbing take-up device 400 as an ALR mechanism includes the switching gear 212 and the switching by the rotation of the gear 408 by the rotation of the spool 20 until all the webbing belts 24 are pulled out from the spool body 22 (spool 20). The member 418 operates in the same manner as the switching gear 212 and the switching member 222 in the first embodiment, and the gear engagement portion 228 of the switching gear 212 moves from the second groove portion 232 to the first groove portion 230, thereby causing the shaft 416. The switching member 418 rotates around. When the sensor engaging portion 422 presses the claw portion 432 of the acceleration sensor 430 by the rotation of the switching member 418, the plate 302 rotates around the shaft 300 and rises even if it is not pushed up by the ball 296.

  Accordingly, when the arm 304 presses the pressure receiving plate 492, the ratchet 76 is formed on the outer peripheral portion of the lock base main body 36 (lock base 34) in the same manner as the “operation as an ELR mechanism based on the VSIR function” described above. The teeth are engaged with each other, and the withdrawal of the webbing belt 24 from the spool 20 is restricted. However, unlike the “operation as an ELR mechanism based on the VSIR function”, the webbing belt 24 is wound around the spool 20 until the webbing belt 24 cannot be wound around the spool 20 until the so-called “all stored state”. Unless the gear engaging part 228 is moved from the first groove part 230 to the second groove part 232, the pressing of the claw part 432 by the sensor engaging part 422 is not canceled, so that the spool 20 is moved in the winding direction until the "all retracted state" is reached. Until the rotation, the restriction of pulling out the webbing belt 24 from the spool 20 is continued as in the ALR mechanism of the webbing take-up device 10 according to the first embodiment.

(Specific actions and effects of the webbing take-up device 400)
As described above, the webbing take-up device 400 has both an ELR function and an ALR function based on both VSIR and WSIR, and inadvertently locks in the pull-out direction in all stored states. It is possible to prevent or suppress the rotation of the base 34 from being restricted. That is, in terms of function, the webbing take-up device 400 has the function of a conventional webbing take-up device.

  Here, in the webbing take-up device 400 according to the present embodiment, the first gear portion 406 of the two-stage gear 404 causes the spool to move between the leg plate 18 and the leg plate 16 and along the rotational radius direction of the spool 20. The rotation of the spool 20 can be transmitted to a gear 408 provided below (side) 20. For this reason, a configuration for detecting a sudden rotation of the spool 20 in the pulling-out direction caused by the vehicle suddenly decelerating state or when the occupant's body suddenly pulls the webbing belt 24 is provided between the leg plate 18 and the leg plate 16. In addition, it can be provided below (side) the spool 20 along the rotational radius direction of the spool 20.

  As a result, the overall dimension along the axial direction of the spool 20 is shortened as compared with the conventional webbing take-up device in which these configurations are sequentially arranged on the side of the spool 20 along the rotational axis direction of the spool 20. it can. In addition, the lower portion of the spool 20 between the leg plate 16 and the leg plate 18 is a portion that is likely to be a so-called dead space, and the space between the leg plate 16 and the leg plate 18 can be arranged in this portion by arranging the above-described configuration. Can be effectively used as a member mounting space, and as a result, the overall size reduction of the webbing take-up device 10 can be achieved.

  Moreover, in the present embodiment, unlike the webbing take-up device 10 according to the first embodiment, the vehicle suddenly decelerates in the lock mechanism 402 below the spool 20 between the leg plate 16 and the leg plate 18. It is only a configuration for detecting a sudden rotation of the spool 20 in the pull-out direction due to the state and the occupant's body abruptly pulling the webbing belt 24. For this reason, when a large rotational force in the pull-out direction is input to the spool 20 in a state where the tooth portion 76 of the lock pawl 72 is engaged with the lock base main body 36 (lock base 34), an impact is applied to the gear 408. Since there is no transmission, the mechanical strength of the gear 408 itself may be small. As a result, the gear 408 can be formed thin in the axial direction of the spool 20 with a relatively light material, so that further downsizing of the lock mechanism 402 and further downsizing of the webbing take-up device 400 can be realized.

It is a disassembled perspective view which shows the structure of the locking means of the webbing take-up device according to the first embodiment of the present invention. It is the disassembled perspective view which expanded a part of structure of the locking means. It is front sectional drawing which expanded a part of structure of the locking means. It is sectional drawing corresponding to FIG. 3 which shows the state which a part of function of the locking means operated. 1 is a front view schematically showing an entire webbing take-up device according to a first embodiment of the present invention. It is a structure of the locking means of the webbing retractor according to the second embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Webbing winding device 12 Frame 16 Leg plate 18 Leg plate 20 Spool 24 Webbing belt 50 Gear (output side transmission gear)
72 Lock pawl (regulation means)
80 Locking mechanism (locking means)
92 gear (input side transmission gear)
400 Webbing take-up device 402 Lock mechanism (locking means)
406 1st gear part (output side transmission gear)
408 gear (input side transmission gear)

Claims (3)

A spool that winds the webbing belt from the longitudinal base end side by locking in the longitudinal base end side of the webbing belt formed in a long belt shape and rotating in a winding direction that is one of its own axis,
It is provided so as to be able to move toward and away from a position that can be directly or indirectly engaged with the spool, and by restricting rotation of the spool in a direction opposite to the winding direction by engaging with the spool. Regulatory means to
At least a part is provided at a position displaced outward in the rotational radial direction of the spool with respect to the spool and on one side in the axial direction of the spool, and when the vehicle satisfies a predetermined condition and the spool is Lock means for moving the regulating means to a position to be directly or indirectly engaged with the spool in at least one of cases where rotation is started at a predetermined speed or more in the pulling direction;
An output side transmission gear provided coaxially with the spool on one side in the axial direction of the spool and rotating integrally with the spool;
The output-side transmission gear meshes with the output-side transmission gear outside the output-side transmission gear along the rotational radius direction of the output-side transmission gear, and rotates in conjunction with the output-side transmission gear. An input side transmission gear for transmitting a rotational force to at least a part of other members constituting the means;
A webbing take-up device comprising:   Among the locking means, a mechanism for detecting at least one of the sudden deceleration state of the vehicle and the rotation of the spool in a direction opposite to the winding direction at a predetermined speed or more with respect to the spool. The spool is disposed at a position displaced outward in the rotational radius direction of the spool and on one side in the axial direction of the spool, and the spool is rotated in a state in which the spool rotates in a direction opposite to the winding direction. When the rotational force in the direction opposite to the take-up direction is input to the spool, the sudden deceleration state of the vehicle and the rotation of the spool in the direction opposite to the take-up direction at a predetermined speed or more. The webbing retractor according to claim 1, wherein transmission to the side of the mechanism that detects at least one of the two is cut off.   The spool includes a pair of leg plates facing each other in the axial direction of the spool, and supports both ends of the spool in the axial direction so as to be directly or indirectly rotatable, and at least one of the locking means between the pair of leg plates. The webbing take-up device according to claim 1, further comprising a frame provided with a portion and supporting the locking means.

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