Webbing winding device

Abstract

This reduces sliding resistance when the displacement member rotates while suppressing the tilting of the displacement member. [Solution] The webbing winding device 10 comprises a spool 12, a lever engaging member 26, a sensor lever 30, and an electromagnet 32. The sensor lever 30 has a cylindrical portion 30A having an insertion hole 30L into which a support shaft 60D is inserted, and a first arm portion 30B and a second arm portion 30E extending from the cylindrical portion 30A, respectively. The support shaft 60D has a shaft-side large diameter portion 60D1 and a shaft-side small diameter portion 60D2. The insertion hole 30L has a hole-side large diameter portion 30L1 positioned opposite the shaft-side large diameter portion 60D1, and a hole-side small diameter portion 30L2 positioned opposite the shaft-side small diameter portion 60D2. Viewed radially from the support shaft 60D, the shaft-side large-diameter portion 60D1 and the hole-side large-diameter portion 30L1 are located on the extension of the second arm portion 30E, while the shaft-side small-diameter portion 60D2 and the hole-side small-diameter portion 30L2 are located on the extension of the first arm portion 30B.

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 member from being difficult to displace to the original position side. The webbing winding device described in this document includes a spool around which the webbing is wound, a sensor lever rotatably supported, 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 allowed, 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 the completion of the displacement of the sensor lever to the second position to be weaker than the attracting force at the time of the 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 difficult to be displaced to the first position side.

[0003] By the way, from the viewpoint of stabilizing the displacement of the sensor lever (displacement member), it is desirable to be able to reduce the sliding resistance when the sensor lever rotates while suppressing the inclination of the sensor lever.

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 reduce sliding resistance when the displacement member rotates while suppressing the tilt of the displacement member, 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 the occupant and rotates in the pulling direction when the webbing is pulled out, an engaged member rotatably provided together with the spool, a rotating support part having an insertion hole into which a displacement member support shaft is inserted and supported rotatably around the displacement member support shaft, and a lever part and a pulling part extending from the rotating support part, respectively, wherein when positioned in the first position, the rotation of the spool in the pulling direction is permitted, and when positioned in the second position, the lever part engages with the engaged member, stopping the rotation of the engaged member in the pulling direction, thereby stopping the rotation of the spool in the pulling direction, and when operated The displacement member support shaft comprises an operating part which is attracted to the pulling part of the displacement member, causing the displacement member to be displaced from the first position to the second position, the displacement member support shaft having a shaft-side large diameter portion whose outer diameter is set to a predetermined dimension, and a shaft-side small diameter portion whose outer diameter is set to a smaller outer diameter than the shaft-side large diameter portion, the insertion hole having a hole-side large diameter portion whose inner diameter is set to a predetermined dimension and is positioned opposite to the shaft-side large diameter portion, and a hole-side small diameter portion whose inner diameter is set to a smaller inner diameter than the hole-side large diameter portion and is positioned opposite to the shaft-side small diameter portion, and when viewed from the radial direction of the displacement member support shaft, the shaft-side large diameter portion and the hole-side large diameter portion are located on the extension of the pulling part, and the shaft-side small diameter portion and the hole-side small diameter portion are located on the extension of the lever portion.

[0007] A second embodiment of the webbing winding device is a webbing winding device of the first embodiment, wherein the operating part includes a magnetic force generating part that generates a magnetic force to attract the pulling part, and the shaft-side large diameter part and the magnetic force generating part are located at the same position in the axial direction of the displacement member support shaft when viewed from the radial direction of the displacement member support shaft, and the shaft-side small diameter part and the lever part are located at the same position in the axial direction of the displacement member support shaft when viewed from the radial direction of the displacement member support shaft.

[0008] The third embodiment of the webbing winding device is a webbing winding device of the first or second embodiment, wherein, when viewed from the radial direction of the displacement member support shaft, the axial dimension of the displacement member support shaft is set to be smaller than the axial dimension of the displacement member support shaft of the operating part.

[0009] The fourth embodiment of the webbing winding device is a webbing winding device of any one embodiment of the first to third embodiments, wherein the displacement member support shaft has a shape that protrudes such that the smaller diameter portion on the shaft side is the tip side in the protruding direction. [Effects of the Invention]

[0010] In the webbing winding device of the first embodiment, when the actuation unit is activated, the pulling portion of the displacement member is pulled towards the actuation unit, and the displacement member is displaced from a first position to a second position. When the displacement member is in the second position, the lever portion of the displacement member engages with the engaged member, stopping the rotation of the engaged member in the pulling direction. This stops the rotation of the spool in the pulling direction. Here, the displacement member support shaft inserted into the insertion hole of the rotation support unit has a shaft-side large diameter portion whose outer diameter is set to a predetermined dimension, and a shaft-side small diameter portion whose outer diameter is set to a smaller diameter than the shaft-side large diameter portion. The insertion hole of the rotation support unit has a hole-side large diameter portion whose inner diameter is set to a predetermined dimension and is positioned opposite the shaft-side large diameter portion, and a hole-side small diameter portion whose inner diameter is set to a smaller diameter than the hole-side large diameter portion and is positioned opposite the shaft-side small diameter portion. Furthermore, when viewed from the radial direction of the displacement member support shaft, the shaft-side large-diameter portion and the hole-side large-diameter portion are located on the extension of the pulling portion, while the shaft-side small-diameter portion and the hole-side small-diameter portion are located on the extension of the lever portion. In this configuration, the shaft-side large-diameter portion and the hole-side large-diameter portion can rotatably support the displacement member, and the load input from the engaged member to the lever portion of the displacement member can be received by the shaft-side small-diameter portion and the hole-side small-diameter portion. This makes it possible to reduce the sliding resistance when the displacement member rotates while suppressing the tilting of the displacement member.

[0011] In the webbing winding device of the second embodiment, the operating part includes a magnetic force generating part that generates a magnetic force to attract the pulling part. When viewed from the radial direction of the displacement member support shaft, the shaft-side large diameter part and the magnetic force generating part are located at the same position in the axial direction of the displacement member support shaft. In addition, when viewed from the radial direction of the displacement member support shaft, the shaft-side small diameter part and the lever part are located at the same position in the axial direction of the displacement member support shaft. In this configuration, compared to a configuration in which the shaft-side large diameter part, magnetic force generating part, shaft-side small diameter part and lever part are located outside the above range, it is possible to suppress the transmission of the load associated with the magnetic force generating part attracting the pulling part to the shaft-side small diameter part, and it is also possible to suppress the transmission of the load input from the engaged member to the lever part of the displacement member to the shaft-side large diameter part.

[0012] In the third embodiment of the webbing winding device, the axial dimension of the displacement member support shaft is set to be smaller than the axial dimension of the displacement member support shaft of the operating part, when viewed from the radial direction of the displacement member support shaft. In this configuration, compared to a configuration in which the axial dimension of the displacement member support shaft is set to be larger than the axial dimension of the displacement member support shaft of the operating part, it is possible to suppress an increase in the size of the area around the displacement member support shaft in the webbing winding device.

[0013] In the webbing winding device of the fourth embodiment, the displacement member support shaft has a protruding shape such that the smaller diameter portion on the shaft side is the tip end in the protruding direction. Compared to a configuration in which the smaller diameter portion on the shaft side is the base end in the protruding direction, this configuration can suppress the tilting of the displacement member support shaft when a load is applied to the displacement member support shaft. [Brief explanation of the drawing]

[0014] [Figure 1] This is a schematic exploded perspective view showing the spool, main lock, and other components that make up part of the webbing winding device. [Figure 2] This is an exploded perspective view showing a disassembled part of the webbing winding device. [Figure 3] This is a disassembled perspective view showing the sensor lever after it has been taken apart. [Figure 4] This is a side view showing the sensor lever. [Figure 5] This is a side view showing the sensor holder and part of the locking mechanism with the sensor cover removed, representing the state before the electromagnet is activated. [Figure 6] This is a side view showing part of the sensor holder and locking mechanism with the sensor cover removed, illustrating the state when the electromagnet is activated and the sensor lever begins to tilt. [Figure 7] This is a side view showing part of the sensor holder and locking mechanism with the sensor cover removed, indicating that the electromagnet is activated and the sensor lever is in the second position. [Figure 8]It is a side view showing a sensor holder and a part of a lock mechanism with the sensor cover removed, and shows a state when the engaging teeth on the lever side of the sensor lever and the engaging teeth of the lever engaging member are engaged. [Figure 9] It is a diagram showing a cross-section cut along the axial direction of the iron core of the lock mechanism etc. and a cross-section cut along the axial direction of the support shaft side by side. [Figure 10] It is a cross-sectional view showing the support shaft and the cylindrical portion cut along the axial direction of the support shaft, and shows the shape of the support shaft and the shape of the cylindrical portion exaggeratedly.

Mode for Carrying Out the Invention

[0015] The webbing winding device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10.

[0016] 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 indicates the rotational axial direction, rotational radial direction, and rotational circumferential direction of the spool 12.

[0017] The spool 12 is formed in a substantially cylindrical shape. This 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. This 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 clockwork spring 21 as a winding biasing member.

[0018] The webbing 14 is worn on the body of an occupant sitting on a vehicle seat, and a proximal end portion, which is one longitudinal end portion thereof, is locked to the spool 12. The spool 12 is rotationally biased in a winding direction, which is one rotational direction (the direction of arrow C in FIG. 1 and the like), by the biasing force of the spring 21. Then, when the spool 12 is rotated in the winding direction, the webbing 14 is wound onto the spool 12 from the proximal end side. Further, when the webbing 14 is pulled out from the spool 12, the spool 12 is rotated in a pulling-out direction, which is the other rotational direction (the direction opposite to arrow C in FIG. 1 and the like). Note that the webbing winding device 10 of the present embodiment is provided with a pretensioner mechanism 15 that rotates the spool 12 in the winding direction in an emergency of a vehicle or the like, which will be described later.

[0019] Next, the lock mechanism 16 will be described.

[0020] The lock mechanism 16 includes a main lock 22 supported by a lock base 20 and a main lock engaging portion 24 with which the main lock 22 engages. Further, the lock mechanism 16 includes a lever engaging member 26 as an engaged member provided so as to be integrally rotatable with the spool 12. Furthermore, the lock mechanism 16 includes a sensor lever 30 as a displacement member disposed radially outside the lever engaging member 26 and an electromagnet 32 as an operating portion disposed to face the sensor lever 30. Also, the lock mechanism 16 includes a sensor holder 60 as a holder member that stores and supports the sensor lever 30, the electromagnet 32, and the like, and a sensor cover 42 as a cover member attached to the sensor holder 60.

[0021] 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 with the main lock support portion as the support axis, 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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 stored with the electromagnet inserted from one side in the axial direction. A cylindrical support shaft 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. The support shaft 60D is an example of a displacement member support shaft.

[0026] As shown in Figures 2, 3, and 4, the sensor lever 30 includes a cylindrical portion 30A which serves as a rotational support portion, into which a support shaft 60D provided in the sensor housing 60B is inserted, allowing it to rotate around the support shaft 60D as the center of rotation. The sensor lever 30 also includes a first arm portion 30B which serves as a lever portion and protrudes radially outward from one end of the cylindrical portion 30A on one axial side (arrow Z direction side). 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.

[0027] As shown in Figures 3 and 4, the sensor lever 30 includes a second arm 30E as a pulling portion 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 electromagnet 32 ​​side of this second arm 30E, which will be described later. 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.

[0028] 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). As an example, the electromagnet 32 ​​is composed of an electromagnet housing 32A that forms the outer shell of the electromagnet 32 ​​and also functions as a yoke, a cylindrical iron core 32B supported by the electromagnet housing 32A, and a coil 32D (see Figure 9) formed around the iron core 32B. When the electromagnet 32 ​​is housed and supported in the electromagnet storage section 60C, the axial direction of the iron core 32B is directed toward the plate 30F. The iron core 32B is an example of a magnetic field generating part.

[0029] 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.

[0030] 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 support shaft 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 support shaft 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.

[0031] 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.

[0032] (Operation and effects of this embodiment) Next, the operation and effects of this embodiment will be described.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Incidentally, from the perspective of stabilizing the displacement of the sensor lever 30, it is desirable to reduce the sliding resistance when the sensor lever 30 rotates while suppressing the tilt of the sensor lever 30. The following describes a configuration for reducing the sliding resistance when the sensor lever 30 rotates while suppressing the tilt of the sensor lever 30.

[0037] (A configuration to suppress the tilt of the sensor lever 30 while reducing the sliding resistance when the sensor lever 30 rotates.) As shown in Figure 9, two loads are applied to the cylindrical portion 30A of the sensor lever 30 and the support shaft 60D of the sensor holder 60: a load F1 mainly caused by the electromagnet 32 ​​attracting the second arm portion 30E, and a load F2 from the lever engaging member 26 side. In this embodiment, the load F1 is set to be received by the outer circumferential surface of the base end side (the other axial side) of the support shaft 60D and the inner circumferential surface of the cylindrical portion 30A on the other axial side, and the load F2 is set to be received by the outer circumferential surface of the tip side (one axial side) of the support shaft 60D and the inner circumferential surface of the cylindrical portion 30A on one axial side.

[0038] More specifically, as shown in Figures 9 and 10, the support shaft 60D comprises a cylindrical shaft-side large-diameter portion 60D1 whose outer diameter is set to a predetermined dimension G1, and a cylindrical shaft-side small-diameter portion 60D2 whose outer diameter is set to an outer diameter G2 smaller than that of the shaft-side large-diameter portion 60D1. In this embodiment, the shaft-side small-diameter portion 60D2 is located on the tip side (one side in the axial direction) of the support shaft 60D relative to the shaft-side large-diameter portion 60D1. Furthermore, the shaft-side small-diameter portion 60D2 and the shaft-side large-diameter portion 60D1 are located coaxially with each other. The outer diameter G1 of the shaft-side large-diameter portion 60D1 is constant in each part in the axial direction, and the outer diameter G2 of the shaft-side small-diameter portion 60D2 is constant in each part in the axial direction. In the support shaft 60D, the portion between the axial-side large-diameter portion 60D1 and the axial-side small-diameter portion 60D2 is a axial-side tapered portion 60D3 that gradually narrows as it moves in one axial direction.

[0039] An insertion hole 30L into which a support shaft 60D is inserted is formed in the inner circumference of the cylindrical portion 30A. The inner diameter of this insertion hole 30L is set to an inner diameter G3 that is slightly larger than the outer diameter G1 of the shaft-side large diameter portion 60D1, and it includes a hole-side large diameter portion 30L1 positioned opposite the shaft-side large diameter portion 60D1. The insertion hole 30L also includes a hole-side small diameter portion 30L2 that is set to an inner diameter G4 that is smaller than the hole-side large diameter portion 30L1 and slightly larger than the outer diameter G2 of the shaft-side small diameter portion 60D2, and it includes a hole-side small diameter portion 30L2 positioned opposite the shaft-side small diameter portion 60D2. Furthermore, the inner diameter G3 of the hole-side large diameter portion 30L1 is constant in all parts in the axial direction, and the inner diameter G4 of the hole-side small diameter portion 30L2 is constant in all parts in the axial direction. In the insertion hole 30L, the portion between the hole-side large diameter portion 30L1 and the hole-side small diameter portion 30L2 is a hole-side narrowing portion 30L3 that gradually narrows as it moves in one axial direction. The hole-side narrowing portion 30L3 is positioned opposite the axial-side narrowing portion 60D3.

[0040] Furthermore, with the support shaft 60D inserted into the insertion hole 30L, when viewed from the radial direction of the support shaft 60D (in a cross-sectional view obtained by cutting the support shaft 60D along its axial center), the shaft-side large diameter portion 60D1 and the hole-side large diameter portion 30L1 are located on the extension of the second arm portion 30E, while the shaft-side small diameter portion 60D2 and the hole-side small diameter portion 30L2 are located on the extension of the first arm portion 30B. More specifically, in the sensor lever 30 of this embodiment, the second arm portion 30E is connected to a position corresponding to the hole-side large diameter portion 30L1 in the cylindrical portion 30A, and the first arm portion 30B is connected to a position corresponding to the hole-side small diameter portion 30L2 in the cylindrical portion 30A. Also, when viewed from the radial direction of the support shaft 60D, the shaft-side large diameter portion 60D1 and the iron core 32B are located at the same position in the axial direction of the support shaft 60D. Furthermore, when viewed from the radial direction of the support shaft 60D, the axial-side small-diameter portion 60D2 and the first arm portion 30B are located at the same position in the axial direction of the support shaft 60D.

[0041] Furthermore, when viewed from the radial direction of the support shaft 60D, the axial dimension H1 of the support shaft 60D is set to be smaller than the axial dimension H2 of the support shaft 60D in the electromagnet 32.

[0042] In the configuration described above, the large-diameter shaft portion 60D1 and the large-diameter hole portion 30L1 can rotatably support the sensor lever 30, and the load F2 input to the first arm portion 30B of the sensor lever 30 from the lever engaging member 26 can be received by the small-diameter shaft portion 60D2 and the small-diameter hole portion 30L2. That is, the load F1 associated with the attraction of the second arm portion 30E of the sensor lever 30 can be received by the large-diameter shaft portion 60D1 and the large-diameter hole portion 30L1, and the load F2 input to the first arm portion 30B of the sensor lever 30 from the lever engaging member 26 can be received by the small-diameter shaft portion 60D2 and the small-diameter hole portion 30L2. By separating the parts that receive the above loads F1 and F2 in this way, the tilt of the sensor lever 30 can be suppressed while reducing the sliding resistance when the sensor lever 30 rotates.

[0043] Furthermore, in the configuration described above, the electromagnet 32 ​​is equipped with an iron core 32B that generates a magnetic force that attracts the second arm portion 30E. When viewed from the radial direction of the support shaft 60D, the axial-side large-diameter portion 60D1 and the iron core 32B are located at the same position in the axial direction of the support shaft 60D. In addition, when viewed from the radial direction of the support shaft 60D, the axial-side small-diameter portion 60D2 and the first arm portion 30B are located at the same position in the axial direction of the support shaft 60D. In this configuration, compared to a configuration in which the large-diameter shaft portion 60D1, the iron core 32B, the small-diameter shaft portion 60D2, and the first arm portion 30B are located outside the above range, it is possible to suppress the transmission of the load F1 caused by the iron core 32B pulling the second arm portion 30E to the small-diameter shaft portion 60D2 side, and to suppress the transmission of the load F2 input from the lever engaging member 26 to the first arm portion 30B of the sensor lever 30 to the large-diameter shaft portion 60D1 side.

[0044] Furthermore, in the configuration described above, the axial dimension H1 of the support shaft 60D, viewed from the radial direction of the support shaft 60D, is set to be smaller than the axial dimension H2 of the electromagnet 32's support shaft 60D. In this configuration, compared to a configuration in which the axial dimension H1 of the support shaft 60D is set to be larger than the axial dimension H2 of the electromagnet 32's support shaft 60D, it is possible to suppress an increase in the size of the area around the support shaft 60D in the webbing winding device 10.

[0045] Furthermore, in the configuration described above, the support shaft 60D has a protruding shape such that the small diameter portion 60D2 on the shaft side is the tip end in the protruding direction. In this configuration, compared to a configuration where the small diameter portion 60D2 on the shaft side is the base end in the protruding direction, the tilt of the support shaft 60D when a load is applied to the support shaft 60D can be suppressed. In addition, by using this configuration for the support shaft 60D, it is possible to suppress the impact on mold removal when molding the sensor holder 60 in a mold.

[0046] 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]

[0047] 10. Webbing winding device 12 spools 14 Webbing 26 Lever engaging member (engaged member) 30 Sensor lever (displacement member) 30A Cylindrical section (rotating support section) 30B First arm section (lever section) 30E 2nd arm (pulling part) 30L insertion hole 30L1 Large diameter section on the hole side 30L2 Hole side small diameter part 32 Electromagnet (operating part) 32B Magnetic field generating section 60D Support shaft (Displacement member support shaft) 60D1 Large diameter section on the shaft side 60D2 Small diameter part on shaft side

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 engaged member is provided so as to be rotatable together with the spool, A displacement member comprising: a rotation support portion having an insertion hole into which a displacement member support shaft is inserted, and which is rotatably supported around the displacement member support shaft; a lever portion and a pull portion extending from the rotation support portion, respectively, wherein when positioned in a first position, the spool is allowed to rotate in the pulling direction, and when positioned in a second position, the lever portion 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, pulls the pulling portion of the displacement member, causing the displacement member to be displaced from the first position to the second position, Equipped with, The displacement member support shaft has a shaft-side large diameter portion whose outer diameter is set to a predetermined dimension, and a shaft-side small diameter portion whose outer diameter is set to be smaller than that of the shaft-side large diameter portion. The insertion hole has a hole-side large-diameter portion whose inner diameter is set to a predetermined dimension and is positioned opposite the shaft-side large-diameter portion, and a hole-side small-diameter portion whose inner diameter is set to a smaller diameter than the hole-side large-diameter portion and is positioned opposite the shaft-side small-diameter portion. A webbing winding device wherein, when viewed from the radial direction of the displacement member support shaft, the shaft-side large diameter portion and the hole-side large diameter portion are located on the extension of the pulling portion, and the shaft-side small diameter portion and the hole-side small diameter portion are located on the extension of the lever portion.

2. The operating unit includes a magnetic force generating unit that generates a magnetic force to attract the attracting unit, When viewed from the radial direction of the displacement member support shaft, the shaft-side large-diameter portion and the magnetic force generating portion are located at the same position in the axial direction of the displacement member support shaft. The webbing winding device according to claim 1, wherein, when viewed from the radial direction of the displacement member support shaft, the shaft-side small diameter portion and the lever portion are located at the same position in the axial direction of the displacement member support shaft.

3. The webbing winding device according to claim 1, wherein, when viewed from the radial direction of the displacement member support shaft, the axial dimension of the displacement member support shaft is set to be smaller than the axial dimension of the displacement member support shaft of the operating part.

4. The webbing winding device according to claim 1, wherein the displacement member support shaft has a shape that protrudes such that the smaller diameter portion on the shaft side becomes the tip side in the protruding direction.

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