Webbing winding device

Abstract

This enables the webbing to be wound onto the spool even while the moving parts are in operation. [Solution] The webbing winding device 10 includes a spool 12, a mainspring 21, a lever engaging member 26, a sensor lever 30, and an electromagnet 32 ​​that, when activated, attracts another part of the sensor lever 30, displacing the sensor lever 30 from a first position P1 to a second position P2. When the sensor lever 30 is displaced to the second position P2, the force with which the electromagnet 32 ​​attracts the other part of the sensor lever 30 is set such that when the spool 12 is rotated in the winding direction together with the lever engaging member 26 by the biasing force of the mainspring 21, a part of the sensor lever 30 is pressed by the lever engaging member 26, and the other part of the sensor lever 30 is pulled away from the electromagnet 32.

Description

Technical Field

[0001] The present invention relates to a webbing winding device.

Background Art

[0002] Patent Document 1 below discloses a webbing winding device that realizes suppressing the displacement of a displacement member to the original position side with difficulty. The webbing winding device described in this document includes a spool around which webbing is wound, a sensor lever, a solenoid, and a control unit. When the sensor lever is disposed at the first position, rotation of the spool in the drawing direction is permitted, and when the sensor lever is disposed at the second position, rotation of the spool in the drawing direction is locked. When the solenoid is operated, a part of the sensor lever is attracted, and the sensor lever is displaced from the first position to the second position. The control unit adjusts the attracting force by which the solenoid attracts a part of the sensor lever. Further, the control unit adjusts the attracting force after completion of the displacement of the sensor lever to the second position to be weaker than the attracting force at the time of completion of the displacement of the sensor lever to the second position. Thereby, it is suppressed that the sensor lever displaced to the second position is displaced to the first position side with difficulty.

[0003] By the way, when slack occurs in the webbing, it is desirable that the webbing can be wound by the spool even during the operation of the solenoid (operating part) to remove the slack of the webbing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention aims to provide a webbing winding device that can wind the webbing onto the spool even while the operating part is in operation, taking the above facts into consideration. [Means for solving the problem]

[0006] The webbing winding device of the first embodiment includes a spool that is rotated in the winding direction to wind up webbing to be attached to a crew member and rotates in the unwinding direction when the webbing is unwinded, a winding mounting member that biases the spool to rotate in the winding direction, an engaging member that is rotatably provided together with the spool, and a displaceable member that, when positioned in the first position, allows the spool to rotate in the unwinding direction, and when positioned in the second position, a part of the spool engages with the engaging member to stop the rotation of the engaging member in the unwinding direction. The device comprises a displacement member that prevents the spool from rotating in the pulling direction, and an operating part that, when activated, attracts another part of the displacement member, causing the displacement member to move from the first position to the second position. The force exerted by the operating part to attract the other part of the displacement member is set such that, when the spool is rotated in the winding direction together with the engaged member by the biasing force of the winding mounting member while the displacement member is displaced to the second position, a part of the displacement member is pressed by the engaged member, causing the other part of the displacement member to move away from the operating part.

[0007] The webbing winding device of the second embodiment includes a spool that is rotated in the winding direction to wind up webbing to be attached to a crew member and rotates in the unwinding direction when the webbing is unwinded, a winding mounting member that biases the spool to rotate in the winding direction, an engaging member that is rotatably provided together with the spool, and a displaceable member that, when positioned in the first position, allows the spool to rotate in the unwinding direction, and when positioned in the second position, a part of the spool engages with the engaging member, thereby stopping the rotation of the engaging member in the unwinding direction, thereby preventing the spool from rotating in the unwinding direction. The device comprises a displacement member that prevents rotation in the pulling direction, and an actuation part that, when actuated, attracts another part of the displacement member, causing the displacement member to displace from the first position to the second position. When the spool is rotated in the winding direction together with the engaged member by the biasing force of the winding mounting member while the displacement member is displaced to the second position, a part of the displacement member is pressed by the engaged member, causing the portion between the displacement member and the other part to bend, and the rigidity of the portion between the displacement member and the other part is adjusted so that the displacement member is displaced on the opposite side from the engaged member.

[0008] The third embodiment of the webbing winding device is a webbing winding device of the first or second embodiment in which the engaged member comprises an engaged member body and engaged teeth that protrude from the outer circumference of the engaged member body and engage with a part of the displacement member, wherein when the displacement member is in the second position, a part of the displacement member is separated from the engaged member body.

[0009] A webbing winding device of a fourth embodiment is a webbing winding device of any one embodiment of the first to third embodiments, 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 contacts the operating part to bias the operating part in two directions within the holder member.

[0010] A fifth embodiment of a webbing winding device is a webbing winding device according to any one embodiment of the first to fourth embodiments, wherein the operating part is arranged within a holder member, and a positioning limiting part is provided within the holder member that positions the operating part by contacting the operating part and limits the displacement of the displacement member by contacting the displacement member. [Effects of the Invention]

[0011] In the webbing winding device of the first embodiment, when the actuation unit is activated, the other part of the displacement member is attracted, causing the displacement member to be displaced from a first position to a second position. When the displacement member is in the second position, a part of the displacement member engages with the engaged member, preventing the engaged member from rotating in the unwinding direction. This prevents the spool from rotating in the unwinding direction. Now, with the displacement member displaced to the second position, when the spool is rotated in the winding direction together with the engaged member by the biasing force of the winding tensioning member, a part of the displacement member is pressed against by the engaged member. This causes the other part of the displacement member to be pulled away from the actuation unit. In this way, even while the actuation unit is operating, the biasing force of the winding tensioning member can pull the other part of the displacement member away from the actuation unit. This allows the webbing to be wound onto the spool even while the actuation unit is operating.

[0012] In the webbing winding device of the second embodiment, the other part of the displacement member is attracted, causing the displacement member to be displaced from the first position to the second position. When the displacement member is in the second position, a part of the displacement member engages with the engaged member, preventing the engaged member from rotating in the unwinding direction. This prevents the spool from rotating in the unwinding direction. Now, with the displacement member displaced to the second position, when the spool is rotated in the winding direction together with the engaged member by the biasing force of the winding tension member, a part of the displacement member is pressed by the engaged member. This causes the portion between the part of the displacement member and the other part to bend, and the part of the displacement member is displaced to the opposite side from the engaged member. In this way, even while the operating part is in operation, a part of the displacement member can be displaced to the opposite side from the engaged member by the biasing force of the winding tension member. This allows the webbing to be wound onto the spool even while the operating part is in operation.

[0013] In the third embodiment of the webbing winding device, when the displacement member is in the second position, a portion of the displacement member is separated from the main body of the engaged member. In this configuration, compared to a configuration in which a portion of the displacement member is in contact with the main body of the engaged member when the displacement member is in the second position, the engaged teeth can more easily overcome a portion of the displacement member when the spool is rotated in the winding direction together with the engaged member by the biasing force of the winding mounting member. As a result, the webbing can be wound by the spool even while the operating part is in operation.

[0014] In the webbing winding device of the fourth embodiment, the actuation part provided within the holder member can be biased in two directions by a biasing portion provided on at least one of the holder member and the cover member.

[0015] In the fifth embodiment of the webbing winding device, the positioning limiting unit provided within the holder member can be used to position the operating unit and to limit the displacement of the displacement member. [Brief explanation of the drawing]

[0016] [Figure 1]It is an exploded perspective view schematically showing a spool, a main lock, etc. that constitute a part of a webbing winding device. [Figure 2] It is an exploded perspective view showing a part of the webbing winding device disassembled. [Figure 3] It is an exploded perspective view showing the sensor lever disassembled. [Figure 4] It is a side view showing the sensor lever. [Figure 5] It is a side view showing a part of the sensor holder and the lock mechanism with the sensor cover removed, showing the state before the electromagnet operates. [Figure 6] It is a side view showing a part of the sensor holder and the lock mechanism with the sensor cover removed, showing the state when the electromagnet operates and the sensor lever starts to tilt. [Figure 7] It is a side view showing a part of the sensor holder and the lock mechanism with the sensor cover removed, showing the state when the electromagnet operates and the sensor lever is arranged at the second position. [Figure 8] It is a side view showing a part of the sensor holder and the lock mechanism with the sensor cover removed, showing the state when the engaging teeth on the lever side of the sensor lever and the engaged teeth of the lever engaging member are engaged. [Figure 9] It is a side view showing a part of the sensor holder and the lock mechanism with the sensor cover removed, showing the state where the second arm portion of the sensor lever is pulled away from the electromagnet by the biasing force of the spring. [Figure 10] It is a side view showing a part of the sensor holder and the lock mechanism with the sensor cover removed, showing the state where the first arm portion of the sensor lever is bent and deformed by the biasing force of the spring. [Figure 11] It is a side view showing a part of the sensor holder and the lock mechanism with the sensor cover removed, showing the state when the electromagnet operates and the sensor lever is arranged at the second position. [Figure 12] It is an enlarged perspective view showing a part of the webbing winding device in a state before the sensor cover is attached, enlarged. [Figure 13] An enlarged perspective view showing an enlarged cross-section of a part of the webbing winding device with the sensor cover attached. [Figure 14] An enlarged perspective view showing an enlarged part of the webbing winding device before the sensor cover is attached. [Figure 15] An enlarged perspective view showing an enlarged cross-section of a part of the webbing winding device before the sensor cover is attached.

Embodiments for Carrying Out the Invention

[0017] The webbing winding device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10.

[0018] As shown in FIGS. 1 and 2, the webbing winding device 10 of the present embodiment includes a spool 12, a webbing 14, and a lock mechanism **************************16. Hereinafter, when simply indicating the axial direction, radial direction, and circumferential direction, unless otherwise specified, it shall indicate the rotational axis direction, rotational radial direction, and rotational circumferential direction of the spool 12.

[0019] The spool 12 is formed in a substantially cylindrical shape. The spool 12 is rotatably supported by the frame 18 between a pair of leg pieces 18A of the frame 18. Inside the spool 12, a known torsion shaft (not shown) constituting a force limiter mechanism is arranged. A lock base 20 is provided on one axial side (arrow Z direction side) of the spool 12. The lock base 20 is coupled to the spool 12 via a torsion shaft. Here, the spool 12 is rotationally biased in the winding direction by a clock spring 21 as a winding biasing member.

[0020] It should be noted that there seems to be some content missing in the description of the lock mechanism 16 in the original text. The translation is based on the existing content as accurately as possible.The webbing 14 is attached to the body of an occupant seated in a vehicle seat, and its longitudinal end, the base end, is locked to the spool 12. The spool 12 is biased to rotate in one direction, the winding direction (direction of arrow C in Figure 1, etc.), by the biasing force of the mainspring 21. As the spool 12 rotates in the winding direction, the webbing 14 is wound onto the spool 12 from the base end. Conversely, as the webbing 14 is pulled out from the spool 12, the spool 12 rotates in the other direction, the pulling direction (direction opposite to arrow C in Figure 1, etc.). The webbing winding 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 will be described later.

[0021] Next, the locking mechanism 16 will be described.

[0022] The locking mechanism 16 comprises a main lock 22 supported by a locking base 20 and a main lock engaging portion 24 into which the main lock 22 engages. The locking mechanism 16 also includes a lever engaging member 26 as an engaged member, which is provided to rotate integrally with the spool 12. Furthermore, the locking mechanism 16 includes a sensor lever 30 as a displacement member positioned radially outward from the lever engaging member 26 and an electromagnet 32 ​​as an operating part positioned opposite the sensor lever 30. The locking mechanism 16 also includes a sensor holder 60 as a holder member that houses and supports the sensor lever 30 and the electromagnet 32, and a sensor cover 42 as a cover member attached to the sensor holder 60.

[0023] As shown in Figure 1, the main lock 22 is formed in a substantially 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, on the radially outward side of the tip end of the main lock 22, there is a main lock engaging tooth 22A that engages with the main lock engaged tooth 24A of the main lock engaging portion 24, which will be described later. When the main lock 22 is tilted (displaced) radially outward using the main lock support portion as a pivot point, the main lock engaging tooth 22A engages with the main lock engaged tooth 24A of the main lock engaging portion 24. In addition, the main lock 22 is provided with a cylindrical protrusion 22B that projects toward one side in the axial direction.

[0024] The main lock engagement portion 24 is formed in an annular shape, for example. Multiple main lock engagement teeth 24A (ratchet teeth) are formed along the circumferential direction on the inner circumference of this main lock engagement portion 24. The main lock engagement portion 24 may be formed integrally with the frame 18 (see Figure 2) that supports the spool 12, or it may be provided separately from the frame 18.

[0025] As shown in Figures 1 and 2, the lever engaging member 26 includes a lever engaging member body portion 26C, which is formed in a substantially disc shape as the engaged member body portion. The radial center of this lever engaging member body portion 26C is rotatably supported by the lock base 20. Furthermore, on the radially outer side of the portion of the lever engaging member body portion 26C supported by the lock base 20, an elongated operating groove 26A is formed, in which the protrusion 22B of the main lock 22 is positioned. The lever engaging member 26 also includes a plurality of engaged teeth 26B (ratchet teeth) that protrude radially outward from the outer circumference of the lever engaging member body portion 26C and are arranged at intervals in the circumferential direction. Furthermore, the lever engaging member 26 described above is rotationally biased in the pulling direction relative to the lock base 20 by a coil spring (not shown) provided between the lever engaging member 26 and the lock base 20, and its rotation in the pulling direction relative to the lock base 20 is stopped.

[0026] As shown in Figure 2, the sensor holder 60 comprises 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 in which the sensor lever 30 and electromagnet 32 ​​are housed and supported. The interior of the lever engagement member covering portion 60A and the interior of the sensor storage portion 60B are in communication in a part of the sensor holder 60. As a result, as will be described in detail later, the sensor lever 30 located in the sensor storage portion 60B can engage with the lever engagement member 26 located in the lever engagement member covering portion 60A.

[0027] The sensor housing 60B is formed in a box shape with one side open in the axial direction. Inside the sensor housing 60B is an electromagnet housing 60C in which the electromagnet 32 ​​is housed with the electromagnet inserted from one side in the axial direction. A cylindrical support shaft portion 60D is provided inside the sensor housing 60B adjacent to the electromagnet housing 60C, protruding toward one side in the axial direction. The open end of the sensor housing 60B is closed by a sensor cover 42 attached to the sensor holder 60.

[0028] As shown in Figures 2, 3, and 4, the sensor lever 30 includes a cylindrical portion 30A into which a pivot shaft portion 60D provided in the sensor housing 60B is inserted, allowing it to rotate around the pivot shaft portion 60D as the center of rotation. The sensor lever 30 also includes a first arm portion 30B that protrudes radially outward from one end of the cylindrical portion 30A on one axial side (direction Z of arrow). The tip of this first arm portion 30B has a lever-side engaging tooth 30C that engages with the engaged tooth 26B of the lever engaging member 26. Here, as shown in Figure 5, a part of the return spring 36 supported in the sensor housing 60B is engaged with the longitudinal middle portion of the first arm portion 30B. As a result, the sensor lever 30 is biased toward the first position P1, which will be described later, by the return spring 36.

[0029] As shown in Figures 3 and 4, the sensor lever 30 includes a second arm 30E that protrudes radially outward from the cylindrical portion 30A and in a direction different from the direction in which the first arm 30B protrudes. This second arm 30E is formed in the shape of a rectangular plate extending radially outward from the cylindrical portion 30A. Furthermore, the other axial end of the second arm 30E extends in the other axial direction relative to the other axial end of the cylindrical portion 30A. A plate 30F is fixed to the side of the second arm 30E that will be described later, on the side of the electromagnet 32. This plate 30F is formed in the shape of a rectangular plate using metal such as iron or steel, as an example, and constitutes a part of the sensor lever 30. Furthermore, in this embodiment, the outer periphery of the plate 30F is locked to the outer peripheral locking portion 30G provided on the second arm portion 30E, and the edge of the opening 30H formed on the inner periphery of the plate 30F is locked to the fixing claw 30J provided on the second arm portion 30E. This ensures that the plate 30F remains fixed to the second arm portion 30E. The plate 30F may also be embedded inside the second arm portion 30E.

[0030] As shown in Figures 2 and 5, the electromagnet 32, as the operating part, generates a magnetic field when a predetermined voltage is applied and energized (operated). For example, the electromagnet 32 ​​is composed of an electromagnet housing 32A that forms the outer casing 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 housed and supported within the electromagnet storage section 60C, the axial direction of the iron core 32B is directed toward the plate 30F.

[0031] As shown in Figure 5, when the electromagnet 32 ​​is not energized (the electromagnet 32 ​​is not operating), the sensor lever 30 assumes a predetermined position relative to the sensor housing 60B (sensor holder 60). This position of the sensor lever 30 is called the first position P1. When the sensor lever 30 is positioned at the first position P1, the lever-side engaging teeth 30C are in a state where they cannot engage with the engaged teeth 26B of the lever engaging member 26 (they are separated). In other words, the lever-side engaging teeth 30C are positioned radially outward with respect to the circle E (see Figure 6) drawn by the dashed line connecting the tips of the teeth 26B of the lever engaging member 26.

[0032] On the other hand, as shown in Figures 6 and 7, when the electromagnet 32 ​​is activated, the second arm portion 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 around the pivot portion 60D (towards the direction of arrow C1). Furthermore, when the sensor lever 30 is tilted from the first position P1 to one side around the pivot portion 60D (towards the direction of arrow C1), the lever-side engaging teeth 30C are positioned to engage with the engaged teeth 26B of the lever engaging member 26. That is, the lever-side engaging teeth 30C are positioned radially inward with respect to the circle E drawn by the dashed line connecting the tooth tips of the engaged teeth 26B of the lever engaging member 26. The position of the sensor lever 30 where the lever-side engaging teeth 30C can engage with the engaged teeth 26B of the lever engaging member 26 is called the second position P2.

[0033] The direction and magnitude of the attractive force exerted by the electromagnet 32 ​​on the second arm portion 30E (plate 30F) of the sensor lever 30 are indicated by arrow F. This attractive force F is assumed to coincide with the direction of the magnetic field generated by the electromagnet 32, which is from the north pole to the south pole or from the south pole to the north pole.

[0034] (Operation and effects of this embodiment) Next, the operation and effects of this embodiment will be described.

[0035] As shown in Figures 1 and 2, according to the webbing winding device 10 of this embodiment, the webbing 14 is pulled out from the spool 12, and the webbing 14 is attached to the occupant seated in the vehicle seat.

[0036] Here, when the deceleration acceleration of a vehicle equipped with the webbing winding device 10 of this embodiment exceeds a predetermined deceleration acceleration, as detected by an acceleration sensor or the like installed on the vehicle (in the event of a vehicle emergency, etc.), the electromagnet 32 ​​is activated. When the electromagnet 32 ​​is activated, as shown in Figures 6 and 7, the second arm portion 30E (plate 30F) of the sensor lever 30 is attracted to the electromagnet 32, and the sensor lever 30 is tilted from the first position P1 to the second position P2. Furthermore, when the sensor lever 30 is tilted from the first position P1 to the second position P2, as shown in Figure 8, the lever-side engaging teeth 30C of the first arm portion 30B of the sensor lever 30 engage with the engaged teeth 26B of the lever engaging member 26, the rotation of the lever engaging member 26 in the pulling direction (the pulling direction of the spool 12) is restricted.

[0037] Then, as shown in Figures 1, 2, and 8, as the vehicle decelerates, the body of the occupant seated in the vehicle seat moves forward, and the webbing 14 is pulled out from the spool 12, causing the spool 12 to rotate in the pulling direction together with the main lock 22. As a result, the protrusion 22B of the main lock 24 moves along the operating groove 26A of the lever engaging member 26 whose rotation is restricted, and the main lock engaging teeth 22A of the main lock 22 engage with the main lock engaged teeth 24A of the main lock engaging portion 24. Consequently, the rotation of the spool 12 in the pulling direction is restricted (locked), and the pulling 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.

[0038] Incidentally, even when the webbing 14 is restricted from being pulled out of the spool 12, it may be desirable to rotate the spool 12 in the winding direction to remove the slack in the webbing 14. Below, we will describe the settings and configurations for achieving the removal of slack in the webbing 14 in such cases.

[0039] (Settings for the electromagnet 32 ​​to eliminate slack in the webbing 14) As shown in Figures 1, 2, and 9, when the sensor lever 30 is displaced to the second position P2 (see Figure 8), and the spool 12 attempts to rotate in the winding direction together with the lever engaging member 26 due to the biasing force of the mainspring 21, the lever-side engaging teeth 30C of the sensor lever 30 are pressed by the engaged teeth 26B of the lever engaging member 26. In the state shown in Figure 9, the lever-side engaging teeth 30C of the sensor lever 30 are pressed radially outward by the engaged teeth 26B of the lever engaging member 26 with a force B. This force B is mainly due to the biasing force of the mainspring 21. Here, when this force B is input to the sensor lever 30, an attractive force F is set so that the second arm portion 30E of the sensor lever 30 is pulled away from the electromagnet 32. In this configuration, even when the webbing 14 is restricted from being pulled out of the spool 12 (while the electromagnet 32 ​​is continuously operating), the biasing force of the mainspring 21 can rotate the spool 12 in the winding direction, thereby removing the slack in the webbing 14.

[0040] (Setting of sensor lever 30 to eliminate slack in webbing 14) As shown in Figures 1, 2, and 10, when the sensor lever 30 is displaced to the second position P2 (see Figure 8), and the spool 12 attempts to rotate in the winding direction together with the lever engaging member 26 due to the biasing force of the mainspring 21, the lever-side engaging teeth 30C of the sensor lever 30 are pressed by the engaged teeth 26B of the lever engaging member 26. In the state shown in Figure 10, the lever-side engaging teeth 30C of the sensor lever 30 are pressed radially outward by the engaged teeth 26B of the lever engaging member 26 with a force B. In the example shown in Figure 10, when this force B is applied to the sensor lever 30, the rigidity of the portion between the lever-side engaging teeth 30C and the cylindrical portion 30A in the first arm portion 30B is adjusted so that when this force B is applied to the sensor lever 30, the portion between the lever-side engaging teeth 30C and the cylindrical portion 30A in the first arm portion 30B bends, causing the lever-side engaging teeth 30C of the sensor lever 30 to be displaced to the opposite side from the lever engaging member 26. In this configuration, even while the electromagnet 32 ​​is operating (even while the second arm 30E (plate 30F) remains attracted to the electromagnet 32), the biasing force of the mainspring 21 can displace the lever-side engaging teeth 30C of the sensor lever 30 to the opposite side from the lever engaging member 26. This allows the spool 12 to be rotated in the winding direction by the biasing force of the mainspring 21, even when the webbing 14 is restricted from being pulled out of the spool 12 (while the electromagnet 32 ​​continues to operate), thereby removing the slack in the webbing 14.

[0041] Furthermore, in the example shown in Figure 11, when the sensor lever 30 is displaced to the second position P2, the lever-side engaging teeth 30C of the sensor lever 30 are radially spaced apart from the outer circumferential surface of the lever engaging member body 26C of the lever engaging member 26. In this setting, compared to a configuration where the lever-side engaging teeth 30C of the sensor lever 30 are in contact with the outer circumferential surface of the lever engaging member body 26C of the lever engaging member 26 when the sensor lever 30 is in the second position P2, the circumferential engagement between the lever-side engaging teeth 30C of the sensor lever 30 and the engaged teeth 26B of the lever engaging member 26 can be reduced. This setting can be combined with the settings and configurations described using Figures 9 and 10. In this case, when the spool 12 is rotated in the winding direction together with the lever engaging member 26 by the biasing force of the mainspring 21, the engaged teeth 26B can more easily overcome the lever-side engaging teeth 30C. This allows the webbing 14 to be wound up by the spool 12 even while the electromagnet 32 ​​is operating.

[0042] (Configuration for positioning the electromagnet 32 ​​within the sensor housing 60B) Incidentally, from the perspective of stabilizing the attractive force F that the electromagnet 32 ​​exerts on the second arm portion 30E (plate 30F) of the sensor lever 30, it is important to position the electromagnet 32 ​​at a predetermined location within the sensor housing 60B. The configuration for positioning the electromagnet 32 ​​within the sensor housing 60B will be described below.

[0043] As shown in Figure 12, the sensor cover 42 is provided with four conical protrusions 62A and 62B that act as biasing portions projecting toward the sensor housing 60B side (the other axial direction). These conical protrusions 62A and 62B are formed in a conical shape that gradually narrows toward the sensor housing 60B side.

[0044] Furthermore, as shown in Figure 13, the sensor housing 60B is provided with a positioning limiting portion 60E that protrudes toward the space between the electromagnet 32 ​​and the second arm portion 30E of the sensor lever 30.

[0045] When the sensor cover 42 is attached to the sensor holder 60, the four conical protrusions 62A and 62B contact the electromagnet housing 32A of the electromagnet 32. As a result, the electromagnet housing 32A of the electromagnet 32 ​​is biased axially toward the other side (direction of arrow D1) by the four conical protrusions 62A and 62B. This positions the electromagnet 32 ​​axially within the sensor housing 60B. In addition, two of the four conical protrusions 62A contact the corner portions 32C of the electromagnet housing 32A of the electromagnet 32. As a result, the electromagnet housing 32A of the electromagnet 32 ​​is biased toward the positioning limiting section 60E (direction of arrow D2) by the two conical protrusions 62A. As a result, the electromagnet 32 ​​is positioned in the direction (direction of arrow D2) opposite the second arm 30E of the sensor lever 30 within the sensor housing 60B.

[0046] Here, the positioning limiting portion 60E functions as a part that limits the displacement of the sensor lever 30 by contacting a part 30K of the second arm portion 30E of the sensor lever 30. Thus, the positioning limiting portion 60E has two functions: the function of positioning the electromagnet 32 ​​and the function of limiting the displacement of the sensor lever 30.

[0047] In the example shown in Figures 14 and 15, a biasing claw portion 60F is provided on the sensor holder 60 side as a biasing portion that functions similarly to the two conical protrusions 62A (see Figure 13) mentioned above. More specifically, the biasing claw portion 60F is provided in the sensor housing 60B and comprises a flexible portion 60G that can be bent and deformed toward the opposite side of the electromagnet housing 32A of the electromagnet 32, and a claw portion 60H that protrudes from one axial end of the flexible portion 60G toward the corner portion 32C of the electromagnet housing 32A of the electromagnet 32. When the electromagnet housing 32A of the electromagnet 32 ​​is inserted into the sensor housing 60B (electromagnet housing 60C), the flexible portion 60G is bent and deformed toward the opposite side of the electromagnet housing 32A of the electromagnet 32, and the claw portion 60H is in contact with the corner portion 32C of the electromagnet housing 32A of the electromagnet 32. In this state, the electromagnet housing 32A of the electromagnet 32 ​​is biased axially toward the other side (direction of arrow D1) by the biasing claw portion 60F. This positions the electromagnet 32 ​​axially within the sensor housing 60B. In addition, the electromagnet housing 32A of the electromagnet 32 ​​is biased toward the positioning limit portion 60E (direction of arrow D2) by the biasing claw portion 60F. As a result, the electromagnet 32 ​​is positioned in the direction opposite to the second arm portion 30E of the sensor lever 30 within the sensor housing 60B (direction of arrow D2).

[0048] Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above, and can be implemented in various other ways without departing from the spirit of the invention. [Explanation of Symbols]

[0049] 10. Webbing winding device 12 spools 14 Webbing 21. Mainspring (winding force component) 26 Lever engaging member (engaged member) 26B Engaged tooth 26C Lever engaging member body (engaged member body) 30 Sensor lever (displacement member) 32 Electromagnet (operating part) 60 Sensor holder (holder component) 62 Sensor cover (cover component) 62A Conical protrusion (biasing portion) 60E Positioning limiting section 60F Biasing claw part (biasing part) P1 1st position P2 2nd position

Claims

1. A spool rotates in the winding direction to wind up the webbing that is attached to the crew, and rotates in the pulling direction when the webbing is pulled out, A winding mounting member that biases the spool to rotate in the winding direction, A engaged member is provided so as to be rotatable together with the spool, A displacement member that is displaceable between a first position and a second position, and when positioned in the first position, allows the spool to rotate in the pulling direction, and when positioned in the second position, a part of it engages with the engaged member, thereby stopping the rotation of the engaged member in the pulling direction, and thus stopping the rotation of the spool in the pulling direction; An operating part, which, when activated, attracts another part of the displacement member, causing the displacement member to be displaced from the first position to the second position, Equipped with, A webbing winding device in which, when the spool is rotated in the winding direction together with the engaged member by the biasing force of the winding mounting member while the displacement member is displaced to the second position, the operating part is configured to exert a force on the other part of the displacement member such that a 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 part.

2. A spool rotates in the winding direction to wind up the webbing that is attached to the crew, and rotates in the pulling direction when the webbing is pulled out, A winding mounting member that biases the spool to rotate in the winding direction, A engaged member is provided so as to be rotatable together with the spool, A displacement member that is displaceable between a first position and a second position, and when positioned in the first position, allows the spool to rotate in the pulling direction, and when positioned in the second position, a part of it engages with the engaged member, thereby stopping the rotation of the engaged member in the pulling direction, and thus stopping the rotation of the spool in the pulling direction; An operating part, which, when activated, attracts another part of the displacement member, causing the displacement member to be displaced from the first position to the second position, Equipped with, A webbing winding device in which, when the spool is rotated in the winding direction together with the engaged member by the biasing force of the winding mounting member while the displacement member is displaced to the second position, a portion of the displacement member is pressed by the engaged member, causing the portion between the displacement member and the other portion to bend, and the rigidity of the portion between the displacement member and the other portion is adjusted so that the displacement member is displaced to the opposite side from the engaged member.

3. The webbing winding device according to claim 1 or 2, wherein the engaged member comprises an engaged member body and engaged teeth that protrude from the outer circumference of the engaged member body and engage with a part of the displacement member, and when the displacement member is in the second position, a part of the displacement member is spaced apart from the engaged member body.

4. The webbing winding device according to claim 1 or 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 portion that contacts the operating part to bias the operating part in two directions within the holder member.

5. The webbing winding device according to claim 1 or 2, wherein the operating part is arranged within a holder member, and the holder member is provided with a positioning limiting part which positions the operating part by contacting the operating part and limits the displacement of the displacement member by contacting the displacement member.

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