Webbing winding device

Abstract

This webbing winding device includes: a spool; a winding urging member; an engaged member; a displacement member that has one part which engages with the engaged member to stop rotation of the engaged member in a pull-out direction, thereby stopping rotation of the spool in the pull-out direction; and an operation part that is operated to attract another part of the displacement member to displace the displacement member from a first position to a second position. A force for attracting the other part of the displacement member by means of the operation part is set such that when the spool is rotated in a winding direction together with the engaged member by an urging force of the winding urging member in a state where the displacement member is displaced to the second position, the one part of the displacement member is pressed by the engaged member and the other part of the displacement member is separated from the operation part.

Description

Webbing retractor

[0001] The present disclosure relates to a webbing take-up device.

[0002] Japanese Patent Application Laid-Open Publication No. 2021-154861 ​​discloses a webbing take-up device that prevents a displacement member from becoming difficult to displace toward its original position. The webbing take-up device described in this document includes a spool on which the webbing is taken up, a sensor lever, a solenoid, and a control unit. When the sensor lever is positioned in a first position, rotation of the spool in the pull-out direction is permitted, and when positioned in a second position, rotation of the spool in the pull-out direction is locked. When the solenoid is activated, a portion of the sensor lever is attracted, displacing the sensor lever from the first position to the second position. The control unit adjusts the attractive force with which the solenoid attracts the portion of the sensor lever. Furthermore, the control unit adjusts the attractive force after the sensor lever has been displaced to the second position to be weaker than the attractive force at the time of completion of displacement to the second position. This prevents the sensor lever, displaced to the second position, from becoming difficult to displace toward the first position.

[0003] Incidentally, when slack occurs in the webbing, it is desirable to be able to remove the slack by winding the webbing around the spool even while the solenoid (actuating portion) is operating.

[0004] The present disclosure provides a webbing take-up device that can take up the webbing by the spool even while an operating part is operating.

[0005] The webbing take-up device of the first aspect includes a spool that is rotated in a take-up direction to take up the webbing to be worn by an occupant, and that rotates in the unwinding direction as the webbing is unwound; a take-up attachment member that rotationally biases the spool in the take-up direction; an engaged member that is rotatably provided together with the spool; and the webbing take-up device is displaceable between a first position and a second position, and when the spool is disposed at the first position, rotation of the spool in the unwinding direction is permitted, and when the spool is disposed at the second position, a portion of the spool engages with the engaged member, preventing rotation of the engaged member in the unwinding direction. and an operating unit which, when activated, attracts another part of the displacement member, thereby displacing the displacement member from the first position to the second position; and when the displacement member is displaced to the second position and the spool is rotated together with the engaged member in the winding direction by the biasing force of the winding attachment member, the force with which the operating unit attracts the other part of the displacement member is set so that, when the displacement member is displaced to the second position, the part of the displacement member is pressed by the engaged member, and the other part of the displacement member is pulled away from the operating unit.

[0006] The webbing take-up device of the second aspect includes a spool that is rotated in a take-up direction to take up the webbing to be worn by an occupant, and that is rotated in the unwinding direction as the webbing is unwound; a take-up attachment force member that rotationally biases the spool in the take-up direction; an engaged member that is rotatably provided together with the spool; and a webbing take-up device that is displaceable between a first position and a second position, and when disposed at the first position, rotation of the spool in the unwinding direction is permitted, and when disposed at the second position, a portion of the spool engages with the engaged member, preventing rotation of the engaged member in the unwinding direction, thereby preventing the spool from rotating. The reel is provided with a displacement member that is prevented from rotating in the unwinding direction, and an operating unit that, when activated, attracts another part of the displacement member, displacing the displacement member from the first position to the second position; when the displacement member is displaced to the second position and the spool is rotated together with the engaged member in the winding direction by the biasing force of the winding attachment member, a part of the displacement member is pressed by the engaged member, causing the part between the part and the other part of the displacement member to bend, and the rigidity of the part between the part and the other part of the displacement member is adjusted so that the part of the displacement member is displaced to the opposite side of the engaged member.

[0007] A webbing retractor of a third aspect is a webbing retractor of the first or second aspect, wherein the engaged member comprises an engaged member main body portion and engaged teeth that protrude from the outer periphery of the engaged member main body portion and engage with a portion of the displacement member, and when the displacement member is positioned at the second position, a portion of the displacement member is spaced apart from the engaged member main body portion.

[0008] A webbing retractor of a fourth aspect is a webbing retractor of any one of the first to third aspects, wherein the operating part is disposed within a holder member, a cover member is attached to the holder member, and at least one of the holder member and the cover member is provided with a biasing portion that abuts against the operating part and biases the operating part in two directions within the holder member.

[0009] A webbing retractor of a fifth aspect is a webbing retractor of any one of the first to fourth aspects, in which the operating unit is disposed within a holder member, and a positioning limiting unit is provided within the holder member that positions the operating unit when the operating unit abuts against it and that limits displacement of the displacement member when the displacement member abuts against it.

[0010] In the webbing take-up device of the first aspect, when the operating unit is operated, the other portion of the displacement member is attracted, displacing the displacement member from the first position to the second position. When the displacement member is disposed in the second position, a portion of the displacement member engages with the engaged member, stopping rotation of the engaged member in the unwinding direction. This stops rotation of the spool in the unwinding direction. Here, when the displacement member is displaced to the second position and the spool is rotated together with the engaged member in the winding direction by the biasing force of the spool attachment force member, a portion of the displacement member is pressed by the engaged member. This causes the other portion of the displacement member to be separated from the operating unit. In this way, even when the operating unit is operating, the biasing force of the spool attachment force member can separate the other portion of the displacement member from the operating unit. This allows the spool to wind the webbing even when the operating unit is operating.

[0011] In the webbing take-up device of the second aspect, another portion of the displacement member is attracted, displacing the displacement member from the first position to the second position. When the displacement member is disposed in the second position, a portion of the displacement member engages with the engaged member, stopping rotation of the engaged member in the unwinding direction. This stops rotation of the spool in the unwinding direction. Here, when the spool is rotated together with the engaged member in the winding direction by the biasing force of the spool attachment force member while the displacement member is displaced to the second position, a portion of the displacement member is pressed by the engaged member. This causes a portion between the portion and the other portion of the displacement member to bend, displacing a portion of the displacement member toward the opposite side from the engaged member. In this way, even when the operating unit is operating, the biasing force of the spool attachment force member can displace a portion of the displacement member toward the opposite side from the engaged member. This allows the spool to wind the webbing even when the operating unit is operating.

[0012] In the webbing take-up device of the third aspect, when the displacement member is located at the second position, a portion of the displacement member is separated from the engaged member main body portion. In this configuration, compared to a configuration in which a portion of the displacement member is in contact with the engaged member main body portion when the displacement member is located at the second position, the engaged tooth can more easily ride over the portion of the displacement member when the spool is rotated together with the engaged member in the take-up direction by the biasing force of the spool attachment force member. This allows the webbing to be taken up by the spool even when the operating part is operating.

[0013] In the webbing take-up device of the fourth aspect, the operating portion provided in the holder member can be biased in two directions by the biasing portion provided on at least one of the holder member and the cover member.

[0014] In the webbing take-up device of the fifth aspect, the positioning limiting portion provided inside the holder member can position the operating portion and limit the displacement of the displacement member.

[0015] FIG. 1 is an exploded perspective view schematically showing a spool, a main lock, and the like that constitute part of a webbing take-up device. FIG. 2 is an exploded perspective view showing a part of the webbing take-up device in an exploded state. FIG. 3 is an exploded perspective view showing a part of the webbing take-up device in an exploded state. FIG. 4 is an exploded perspective view showing a part of the sensor lever in an exploded state. FIG. 5 is a side view showing the sensor lever. FIG. 6 is a side view showing a part of the sensor holder and the locking mechanism with the sensor cover removed, showing a state before the electromagnet is activated. FIG. 7 is a side view showing a part of the sensor holder and the locking mechanism with the sensor cover removed, showing a state when the electromagnet is activated and the sensor lever begins to tilt. FIG. 8 is a side view showing a part of the sensor holder and the locking mechanism with the sensor cover removed, showing a state when the electromagnet is activated and the sensor lever is positioned at a second position. FIG. 9 is a side view showing a part of the sensor holder and the locking mechanism with the sensor cover removed, showing a state when the lever-side engagement tooth of the sensor lever and the engaged tooth of the lever engagement member are engaged. FIG. 10 is a side view showing a part of the sensor holder and the locking mechanism with the sensor cover removed, showing a state when the second arm of the sensor lever is pulled away from the electromagnet by the biasing force of the spiral spring. Fig. 1 is a side view showing a portion of the sensor holder and the locking mechanism with the sensor cover removed, illustrating a state in which a first arm of the sensor lever is flexed and deformed by the biasing force of the spiral spring. Fig. 2 is a side view showing a portion of the sensor holder and the locking mechanism with the sensor cover removed, illustrating a state in which the electromagnet is activated and the sensor lever is disposed at a second position. Fig. 3 is an enlarged perspective view showing an enlarged cross section of a portion of the webbing take-up device with the sensor cover attached. Fig. 4 is an enlarged perspective view showing an enlarged cross section of a portion of the webbing take-up device with the sensor cover attached. Fig. 5 is an enlarged perspective view showing an enlarged cross section of a portion of the webbing take-up device with the sensor cover attached.

[0016] A webbing take-up device according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 10.

[0017] 1 and 2, the webbing take-up device 10 of this embodiment includes a spool 12, a webbing 14, and a locking mechanism 16. Note that hereinafter, when simply referring to an axial direction, a radial direction, or a circumferential direction, unless otherwise specified, these refer to the rotational axis direction, rotational radial direction, or rotational circumferential direction of the spool 12.

[0018] The spool 12 is formed in a substantially cylindrical shape. The spool 12 is rotatably supported on the frame 18 between a pair of legs 18A of the frame 18. A known torsion shaft (not shown) that constitutes a force limiter mechanism is disposed inside the spool 12. A lock base 20 is provided on one axial side (the side in the direction of arrow Z) of the spool 12. The lock base 20 is coupled to the spool 12 via the torsion shaft. The spool 12 is rotatably biased in the winding direction by a spiral spring 21 that serves as a winding attachment member.

[0019] The webbing 14 is worn around the body of an occupant seated in a vehicle seat, and a base end portion thereof, which is one longitudinal end portion thereof, is engaged with the spool 12. The spool 12 is urged to rotate in one rotational direction, that is, a winding direction (the direction of arrow C in FIG. 1 , etc.), by the biasing force of a spiral spring 21. When the spool 12 is rotated in the winding direction, the webbing 14 is wound onto the spool 12 from the base end side. When the webbing 14 is pulled out from the spool 12, the spool 12 is rotated in the other rotational direction, that is, an unwinding direction (the direction opposite to arrow C in FIG. 1 , etc.). The webbing take-up device 10 of this embodiment is provided with a pretensioner mechanism 15 that rotates the spool 12 in the winding direction in the event of a vehicle emergency, etc., as described below.

[0020] Next, the locking mechanism 16 will be described.

[0021] The lock mechanism 16 includes a main lock 22 supported by the lock base 20 and a main lock engagement portion 24 with which the main lock 22 engages. The lock mechanism 16 also includes a lever engagement member 26 as an engaged member that is rotatable integrally with the spool 12. The lock mechanism 16 also includes a sensor lever 30 as a displacement member arranged radially outward of the lever engagement member 26, and an electromagnet 32 ​​as an actuating portion arranged opposite the sensor lever 30. The lock mechanism 16 also includes a sensor holder 60 as a holder member that houses and supports the sensor lever 30, the electromagnet 32, etc., and a sensor cover 62 as a cover member attached to the sensor holder 60.

[0022] As shown in Figure 1, the main lock 22 is formed in a generally rectangular block shape. The base end of the main lock 22 is tiltably supported by a main lock support portion provided on the lock base 20. Furthermore, a main lock engagement tooth 22A is formed on the radially outer side of the tip end of the main lock 22. This main lock engagement tooth 22A engages with a main lock engaged tooth 24A of a main lock engagement portion 24 (described later). When the main lock 22 is tilted (displaced) radially outward around the main lock support portion as a support shaft, the main lock engagement tooth 22A engages with the main lock engaged tooth 24A of the main lock engagement portion 24. The main lock 22 also has a cylindrical protrusion 22B that protrudes toward one axial side.

[0023] The main lock engaging portion 24 is formed, for example, in an annular shape, and a plurality of main lock engaged teeth 24A (ratchet teeth) are formed along the circumferential direction on the inner periphery of the main lock engaging portion 24. The main lock engaging portion 24 may be formed integrally with the frame 18 (see FIG. 2 ) that supports the spool 12, or may be provided separately from the frame 18.

[0024] As shown in FIGS. 1 and 2 , the lever engagement member 26 includes a lever engagement member main body 26C formed in a generally circular disk shape as an engaged member main body. The radial center of the lever engagement member main body 26C is rotatably supported by the lock base 20. A slot-shaped operating groove 26A is formed radially outward from the portion of the lever engagement member main body 26C supported by the lock base 20, into which the protrusion 22B of the main lock 22 is disposed. The lever engagement member 26 also includes a plurality of engaged teeth 26B (ratchet teeth) that protrude radially outward from the outer periphery of the lever engagement member main body 26C and are spaced apart circumferentially. The lever engagement member 26 described above is prevented from rotating in the withdrawal direction relative to the lock base 20 while being biased to rotate in the withdrawal direction relative to the lock base 20 by a coil spring (not shown) provided between the lever engagement member 26 and the lock base 20.

[0025] 2, the sensor holder 60 includes a lever engagement member covering portion 60A that covers the lever engagement member 26 from the radially outer side and one axial side, and a sensor storage portion 60B that stores and supports the sensor lever 30, electromagnet 32, etc. The interior of the lever engagement member covering portion 60A and the interior of the sensor storage portion 60B are configured to communicate with each other in a part of the sensor holder 60. This allows the sensor lever 30 arranged in the sensor storage portion 60B to engage with the lever engagement member 26 arranged in the lever engagement member covering portion 60A, as will be described in detail later.

[0026] The sensor storage section 60B is formed in a box shape with one axial side open. An electromagnet storage section 60C is provided inside this sensor storage section 60B, and the electromagnet 32 ​​is stored in a state where it is inserted from one axial side. Furthermore, a cylindrical support shaft 60D that protrudes toward one axial side is provided inside the sensor storage section 60B at a position adjacent to the electromagnet storage section 60C. The open end of the sensor storage section 60B is closed by a sensor cover 62 attached to the sensor holder 60.

[0027] As shown in FIGS. 2, 3, and 4, the sensor lever 30 includes a cylindrical portion 30A that is rotatable around a support shaft 60D provided in a sensor storage portion 60B. The sensor lever 30 also includes a first arm 30B that protrudes radially outward from an end of the cylindrical portion 30A on one axial side (the side indicated by arrow Z) of the cylindrical portion 30A. A lever-side engagement tooth 30C that engages with an engaged tooth 26B of the lever engagement member 26 is formed at the tip of the first arm 30B. As shown in FIG. 5, a portion of a return spring 36 supported within the sensor storage portion 60B engages with a longitudinally intermediate portion of the first arm 30B. This biases the sensor lever 30 toward a first position P1 (described later) by the return spring 36.

[0028] 3 and 4 , the sensor lever 30 includes a second arm 30E that protrudes from the cylindrical portion 30A radially outward of the cylindrical portion 30A in a direction different from the direction in which the first arm 30B protrudes. The second arm 30E is formed in a rectangular plate shape extending radially outward from the cylindrical portion 30A. The other axial end of the second arm 30E extends further axially than the other axial end of the cylindrical portion 30A. A plate 30F is fixed to the second arm 30E on the side of an electromagnet 32 ​​(described later). The plate 30F is formed in a rectangular plate shape using, for example, iron or steel, and constitutes part of the sensor lever 30. In this embodiment, the outer periphery of the plate 30F is engaged with an outer periphery engaging portion 30G provided on the second arm 30E, and the edge of an opening 30H formed on the inner periphery of the plate 30F is engaged with a fixing claw 30J provided on the second arm 30E. This keeps the plate 30F fixed to the second arm 30E. The plate 30F may also be embedded inside the second arm 30E.

[0029] 2 and 5, the electromagnet 32 ​​serving as an actuator generates a magnetic field when a predetermined voltage is applied to it and it is energized (activated). As an example, the electromagnet 32 ​​includes an electromagnet housing 32A that forms the outer shell of the electromagnet 32, a cylindrical iron core 32B supported by the electromagnet housing 32A, and a coil formed around the iron core 32B. When the electromagnet 32 ​​is stored and supported in the electromagnet storage section 60C, the axial direction of the iron core 32B faces toward the plate 30F.

[0030] 5, when the electromagnet 32 ​​is not energized (when the electromagnet 32 ​​is not activated), the sensor lever 30 is in a predetermined position relative to the sensor storage section 60B (sensor holder 60). The position of the sensor lever 30 in this state is referred to as a first position P1. Furthermore, when the sensor lever 30 is disposed in the first position P1, the lever-side engagement tooth 30C is in a state in which it cannot engage with (is separated from) the engaged tooth 26B of the lever engagement member 26. In other words, the lever-side engagement tooth 30C is disposed radially outward from a circle E (see FIG. 6) drawn by a two-dot chain line connecting the tips of the engaged tooth 26B of the lever engagement member 26.

[0031] 6 and 7 , when the electromagnet 32 ​​is activated, the second arm 30E (plate 30F) of the sensor lever 30 is attracted to the electromagnet 32, causing the sensor lever 30 to tilt from the first position P1 to one side (the direction of arrow C1) around the support shaft 60D. When the sensor lever 30 is tilted from the first position P1 to one side (the direction of arrow C1) around the support shaft 60D, the lever-side engagement tooth 30C is positioned at a position where it can engage with the engaged tooth 26B of the lever engagement member 26. That is, the lever-side engagement tooth 30C is positioned radially inward of a circle E drawn by a two-dot chain line connecting the tips of the engaged tooth 26B of the lever engagement member 26. The position of the sensor lever 30 where the lever-side engagement tooth 30C can engage with the engaged tooth 26B of the lever engagement member 26 is referred to as a second position P2.

[0032] The direction and magnitude of the attractive force with which the electromagnet 32 ​​attracts the second arm 30E (plate 30F) of the sensor lever 30 is indicated by an arrow F. This attractive force F is assumed to coincide with the direction of the magnetic field generated by the electromagnet 32, that is, the direction from the north pole to the south pole or the direction from the south pole to the north pole.

[0033] (Operations and Effects of the Present Embodiment) Next, operations and effects of the present embodiment will be described.

[0034] As shown in Figures 1 and 2, according to the webbing take-up device 10 of this embodiment, the webbing 14 is pulled out from the spool 12, and the webbing 14 is put on an occupant seated in a vehicle seat.

[0035] Here, when an acceleration sensor or the like provided in the vehicle detects that the deceleration acceleration of a vehicle equipped with the webbing take-up device 10 of this embodiment exceeds a predetermined deceleration acceleration (e.g., in a vehicle emergency), the electromagnet 32 ​​is activated. When the electromagnet 32 ​​is activated, the second arm 30E (plate 30F) of the sensor lever 30 is attracted to the electromagnet 32, causing the sensor lever 30 to tilt from the first position P1 to the second position P2, as shown in Figures 6 and 7. Furthermore, when the sensor lever 30 is tilted from the first position P1 to the second position P2, and the lever-side engagement tooth 30C of the first arm 30B of the sensor lever 30 engages with the engaged tooth 26B of the lever engagement member 26 as shown in Figure 8, rotation of the lever engagement member 26 in the pull-out direction (the pull-out direction of the spool 12) is restricted.

[0036] 1 , 2 , and 8 , when the body of an occupant seated in the vehicle seat moves toward the front of the seat due to deceleration of the vehicle and the webbing 14 is pulled out from the spool 12, the spool 12 rotates in the pull-out direction together with the main lock 22. As a result, the convex portion 22B of the main lock 22 moves along the operating groove 26A of the lever engagement member 26 whose rotation is restricted, and the main lock engagement tooth 22A of the main lock 22 engages with the main lock engaged tooth 24A of the main lock engagement portion 24. As a result, the rotation of the spool 12 in the pull-out direction is restricted (locked), and the pull-out of the webbing 14 from the spool 12 is restricted. As a result, the body of the occupant seated in the vehicle seat is restrained by the webbing 14.

[0037] However, there may be cases where it is desirable to be able to rotate the spool 12 in the take-up direction to remove slack from the webbing 14 even when the withdrawal of the webbing 14 from the spool 12 is restricted. Below, settings and configurations for realizing removal of slack from the webbing 14 in such cases will be described.

[0038] 1 , 2 , and 9 , when the sensor lever 30 is displaced to the second position P2 (see FIG. 8 ), if the spool 12 attempts to rotate together with the lever engaging member 26 in the winding direction due to the biasing force of the spiral spring 21, the lever-side engaging tooth 30C of the sensor lever 30 is pressed by the engaged tooth 26B of the lever engaging member 26. In the state shown in FIG. 9 , the lever-side engaging tooth 30C of the sensor lever 30 is pressed radially outward by the engaged tooth 26B of the lever engaging member 26 with a force B. This force B is mainly due to the biasing force of the spiral spring 21. Here, an attractive force F with which the electromagnet 32 ​​attracts the second arm 30E (plate 30F) of the sensor lever 30 is set so that the second arm 30E of the sensor lever 30 is pulled away from the electromagnet 32 ​​when the force B is input to the sensor lever 30. In this setting, even when the withdrawal of the webbing 14 from the spool 12 is restricted (the electromagnet 32 ​​continues to operate), the spool 12 can be rotated in the winding direction by the biasing force of the spiral spring 21, thereby removing slack from the webbing 14.

[0039] 1, 2, and 10, when the sensor lever 30 is displaced to the second position P2 (see FIG. 8), if the spool 12 attempts to rotate in the winding direction together with the lever engaging member 26 due to the biasing force of the spiral spring 21, the lever-side engaging tooth 30C of the sensor lever 30 is pressed by the engaged tooth 26B of the lever engaging member 26. In the state shown in FIG. 10, the lever-side engaging tooth 30C of the sensor lever 30 is pressed radially outward by the engaged tooth 26B of the lever engaging member 26 with a force B. 10 , the rigidity of the portion of the first arm 30B between the lever-side engagement tooth 30C and the cylindrical portion 30A is adjusted so that when the force B is input to the sensor lever 30, the portion of the first arm 30B between the lever-side engagement tooth 30C and the cylindrical portion 30A bends and the lever-side engagement tooth 30C of the sensor lever 30 is displaced away from the lever engagement member 26. With this setting, even when the electromagnet 32 ​​is activated (even when the second arm 30E (plate 30F) remains attracted to the electromagnet 32), the biasing force of the spiral spring 21 can displace the lever-side engagement tooth 30C of the sensor lever 30 away from the lever engagement member 26. As a result, even when the unwinding of the webbing 14 from the spool 12 is restricted (even when the electromagnet 32 ​​continues to be activated), the biasing force of the spiral spring 21 can rotate the spool 12 in the winding direction, thereby removing slack in the webbing 14.

[0040] 11 , when the sensor lever 30 is displaced to the second position P2, the lever-side engagement tooth 30C of the sensor lever 30 is radially spaced apart from the outer circumferential surface of the lever engagement member main body 26C of the lever engagement member 26. With this setting, the circumferential engagement margin between the lever-side engagement tooth 30C of the sensor lever 30 and the engaged tooth 26B of the lever engagement member 26 can be reduced compared to a configuration in which the lever-side engagement tooth 30C of the sensor lever 30 contacts the outer circumferential surface of the lever engagement member main body 26C of the lever engagement member 26 when the sensor lever 30 is located at the second position P2. This setting can be combined with the settings and configurations described with reference to FIGS. 9 and 10 . In this case, when the spool 12 is rotated in the winding direction together with the lever engagement member 26 by the biasing force of the spiral spring 21, the engaged tooth 26B can more easily ride over the lever-side engagement tooth 30C. This allows the webbing 14 to be wound by the spool 12 even while the electromagnet 32 ​​is in operation.

[0041] (Configuration for Positioning Electromagnet 32 ​​Within Sensor Storage Section 60B) Incidentally, it is important to place the electromagnet 32 ​​at a predetermined position within the sensor storage section 60B from the viewpoint of stabilizing the attractive force F with which the electromagnet 32 ​​attracts the second arm 30E (plate 30F) of the sensor lever 30. Below, a configuration for positioning the electromagnet 32 ​​within the sensor storage section 60B will be described.

[0042] 12, four conical protrusions 62A, 62B are provided as biasing portions that protrude toward the sensor storage section 60B (the other axial side) on the sensor cover 62. These conical protrusions 62A, 62B are formed in a conical shape that gradually narrows as they approach the sensor storage section 60B.

[0043] As shown in FIG. 13, the sensor storage section 60B is provided with a positioning limiting section 60E that protrudes toward a position between the electromagnet 32 ​​and the second arm section 30E of the sensor lever 30.

[0044] When the sensor cover 62 is attached to the sensor holder 60, the four conical protrusions 62A, 62B contact the electromagnet housing 32A of the electromagnet 32. As a result, the electromagnet housing 32A of the electromagnet 32 ​​is biased toward the other axial side (the direction of arrow D1) by the four conical protrusions 62A, 62B. This allows the electromagnet 32 ​​to be positioned axially within the sensor storage section 60B. Furthermore, two of the four conical protrusions 62A, 62B, contact the corner portion 32C of the electromagnet housing 32A of the electromagnet 32. As a result, the two conical protrusions 62A bias the electromagnet housing 32A of the electromagnet 32 ​​toward the positioning limiter 60E (the direction of arrow D2). As a result, the electromagnet 32 ​​is positioned in the sensor storage portion 60B in a direction facing the second arm portion 30E of the sensor lever 30 (the direction of arrow D2).

[0045] Here, the positioning limiting portion 60E functions as a portion that limits the displacement of the sensor lever 30 by being abutted by a part 30K of the second arm portion 30E of the sensor lever 30. In this way, the positioning limiting portion 60E has two functions: a function to position the electromagnet 32 ​​and a function to limit the displacement of the sensor lever 30.

[0046] 14 and 15, a biasing claw 60F is provided on the sensor holder 60 as a biasing part that functions similarly to the two conical protrusions 62A (see FIG. 13). More specifically, the biasing claw 60F is provided on the sensor storage section 60B and includes a flexible portion 60G that is flexibly deformable in the direction opposite to the electromagnet housing 32A of the electromagnet 32, and a claw 60H that protrudes from one axial end of the flexible portion 60G toward the corner 32C of the electromagnet housing 32A of the electromagnet 32. When the electromagnet housing 32A of the electromagnet 32 ​​is inserted into the sensor storage section 60B (electromagnet storage section 60C), the flexible portion 60G is flexibly deformed in the direction opposite to the electromagnet housing 32A of the electromagnet 32, and the claw 60H abuts against the corner 32C of the electromagnet housing 32A of the electromagnet 32. In this state, the electromagnet casing 32A of the electromagnet 32 ​​is urged toward the other axial side (the direction of arrow D1) by the urging claw 60F. This allows the electromagnet 32 ​​to be positioned axially within the sensor storage section 60B. In addition, the electromagnet casing 32A of the electromagnet 32 ​​is urged toward the positioning limiter 60E (the direction of arrow D2) by the urging claw 60F. As a result, the electromagnet 32 ​​is positioned within the sensor storage section 60B in a direction facing the second arm 30E of the sensor lever 30 (the direction of arrow D2).

[0047] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope that does not deviate from the gist of the present disclosure.

[0048] The disclosure of Japanese Patent Application No. 2024-151001, filed on September 2, 2024, is incorporated herein by reference in its entirety.

[0049] All publications, patent applications, and technical standards mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication, patent application, or technical standard was specifically and individually indicated to be incorporated by reference.

Claims

1. A vehicle seat comprising: a spool that rotates in a retracting direction to retract a webbing to be worn by an occupant, and that rotates in the unretracting direction as the webbing is unretracted; a retraction attachment member that rotates the spool in the retracting direction; an engaged member that is rotatable together with the spool; a displacement member that is displaceable between a first position and a second position, and that, when located at the first position, allows rotation of the spool in the unretracting direction, and, when located at the second position, a part of the displacement member engages with the engaged member, stopping the rotation of the engaged member in the unretracting direction, thereby stopping the rotation of the spool in the unretracting direction; and an operating unit that, when actuated, attracts another part of the displacement member, causing the displacement member to be displaced from the first position to the second position. a webbing take-up device in which a force with which the operating unit attracts the other portion of the displacement member is set so that, when the spool is rotated together with the engaged member in the winding direction by the biasing force of the spool attachment force member while the displacement member is displaced to the second position, a portion of the displacement member is pressed by the engaged member and the other portion of the displacement member is pulled away from the operating unit.

2. A vehicle comprising: a spool that rotates in the winding direction to wind up a webbing to be worn by an occupant, and that rotates in the unwinding direction as the webbing is unwound; a winding attachment member that rotates the spool in the winding direction; an engaged member that is rotatable together with the spool; a displacement member that is displaceable between a first position and a second position, and that, when located at the first position, allows rotation of the spool in the unwinding direction, and when located at the second position, a part of the displacement member engages with the engaged member, stopping the rotation of the engaged member in the unwinding direction, thereby stopping the rotation of the spool in the unwinding direction; and an operating unit that, when activated, attracts another part of the displacement member, causing the displacement member to be displaced from the first position to the second position. a webbing take-up device in which the rigidity of a portion between the first and second portions of the displacement member is adjusted so that, when the spool is rotated in the take-up direction together with the engaged member by the biasing force of the spool attachment force member while the displacement member is displaced to the second position, a portion of the displacement member is pressed by the engaged member, the portion between the first and second portions of the displacement member is bent, and the portion of the displacement member is displaced to the opposite side from the engaged member.

3. A webbing take-up device as described in claim 1 or claim 2, wherein the engaged member comprises an engaged member main body portion and engaged teeth that protrude from the outer periphery of the engaged member main body portion and engage with a portion of the displacement member, and when the displacement member is positioned in the second position, a portion of the displacement member is separated from the engaged member main body portion.

4. A webbing retractor as described in claim 1 or claim 2, wherein the operating part is disposed within a holder member, a cover member is attached to the holder member, and at least one of the holder member and the cover member is provided with a biasing part that abuts against the operating part and biases the operating part in two directions within the holder member.

5. A webbing retractor as described in claim 1 or claim 2, wherein the operating portion is disposed within a holder member, and a positioning limiting portion is provided within the holder member that positions the operating portion when the operating portion abuts against it and limits the displacement of the displacement member when the displacement member abuts against it.

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