Webbing winding device

Abstract

To inhibit a compression coil spring from coming off when impact is applied.SOLUTION: A webbing winding device comprises a spool, a V gear 38 having a first spring engagement part 80, a lock pawl, a W pawl 44 having a second spring engagement part 90, and a return spring 46 disposed between the first spring engagement part 80 and the second spring engagement part 90. A boss part 84 inserted on one side of a return spring 46 is disposed at the first spring engagement part 80. A storage part 92 in which the other side of the return spring 46 is stored is disposed at the second spring engagement part 90. In the state that the W pawl 44 is located at a return position as well as the state that the return spring 46 is totally compressed on the side of the first spring engagement part 80, a displacement at an end on the side of the second spring engagement part 90 in the return spring 46 is limited by the storage part 92.SELECTED DRAWING: Figure 7

Description

Technical Field

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

Background Art

[0002] The following Patent Document 1 discloses a webbing winding device (seat belt retractor) including a V gear (locking clutch body) that rotates together with a spool (winding drum), and a W pulley (locking arm) that is swingably supported by the V gear. In the webbing winding device described in this document, a compression coil spring that biases the W pulley in one direction is provided between the W pulley and the V gear.

[0003] By the way, when an impact is applied to the webbing winding device by dropping the webbing winding device or the like, it is desirable to be able to suppress the compression coil spring from coming out from between the W pulley and the V gear. However, the configuration described in the following Patent Document 1 has room for improvement in this regard.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In consideration of the above facts, an object of the present invention is to obtain a webbing winding device capable of suppressing the compression coil spring from coming out when an impact is applied.

Means for Solving the Problems

[0006] A webbing winding device according to the first embodiment includes a spool on which webbing to be attached to a crew member can be wound, which is rotated in the winding direction to wind the webbing and which is rotated in the unwinding direction when the webbing is pulled out; a rotating body which is rotatable in conjunction with the rotation of the spool and has a first spring engagement portion; a restricting member which, when actuated, restricts the rotation of the spool in the unwinding direction; an operating member which is supported by the rotating body and is swingable relative to the rotating body, which swings from a first position to a second position to actuate the restricting member when the rotating body is rotated in the unwinding direction at a speed greater than a predetermined speed and has a second spring engagement portion; and the first spring engagement portion and the second The device comprises a compression coil spring provided between the operating member and a spring engagement portion to bias the operating member toward the first position; a boss portion provided on one of the first spring engagement portion and the second spring engagement portion and inserted into one side of the compression coil spring; and a storage portion provided on the other of the first spring engagement portion and the second spring engagement portion and storing the other side of the compression coil spring, wherein when the operating member is in the first position and the compression coil spring is fully compressed toward the first spring engagement portion, the displacement of the end of the compression coil spring toward the second spring engagement portion is limited by the boss portion or the storage portion.

[0007] A webbing winding device according to a second embodiment includes a spool that is capable of winding webbing attached to a crew member, which is rotated in the winding direction to wind the webbing and rotates in the unwinding direction when the webbing is pulled out; a rotating body that is rotatable in conjunction with the rotation of the spool and has a first spring engagement portion; a regulating member that, when actuated, restricts the rotation of the spool in the unwinding direction; an operating member that is supported by the rotating body and is pivotable relative to the rotating body, which pivots from a first position to a second position to actuate the regulating member when the rotating body is rotated in the unwinding direction at a speed exceeding a predetermined speed and has a second spring engagement portion; and the first spring engagement portion and the second The device comprises a compression coil spring provided between the operating member and a spring engagement portion to bias the operating member toward the first position; a boss portion provided on one of the first spring engagement portion and the second spring engagement portion and inserted into one side of the compression coil spring; and a storage portion provided on the other of the first spring engagement portion and the second spring engagement portion and storing the other side of the compression coil spring, wherein when the operating member is in the second position and the compression coil spring is fully compressed toward the second spring engagement portion, the displacement of the end of the compression coil spring toward the first spring engagement portion is limited by the boss portion or the storage portion.

[0008] The webbing winding device according to the third embodiment is a webbing winding device according to the first or second embodiment in which, in all states from when the operating member is in the first position to when it is in the second position, the end of the boss portion on the storage portion side is located inside the storage portion.

[0009] The webbing winding device according to the fourth embodiment is a webbing winding device according to any one of the first to third embodiments, wherein the storage portion is provided in the second spring engagement portion.

[0010] The fifth embodiment of the webbing winding device is a webbing winding device according to any one of the first to fourth embodiments, wherein a recess is formed at the end of the storage section on the boss side, with the boss side being open. [Effects of the Invention]

[0011] In the webbing winding device according to the first embodiment, when the webbing is rapidly pulled out from the spool, the spool rotates rapidly in the pulling direction. Consequently, when the rotating body rotates in the pulling direction at a speed exceeding a predetermined speed, the operating member swings from the first position to the second position, and the restricting member is activated. This restricts the rotation of the spool in the pulling direction, thereby limiting the pulling of the webbing from the spool. Here, a compression coil spring is provided between the first spring engagement portion of the rotating body and the second spring engagement portion of the operating member, biasing the operating member toward the first position. Furthermore, a boss portion is provided on one of the first and second spring engagement portions, which is inserted into one side of the compression coil spring. In addition, a storage portion is provided on the other of the first and second spring engagement portions, which houses the other side of the compression coil spring. When the operating member is in the first position and the compression coil spring is fully compressed toward the first spring engagement portion, the displacement of the end of the compression coil spring toward the second spring engagement portion is restricted by the boss portion or the storage portion. This prevents the compression coil spring from coming out from between the first and second spring engagement parts when an impact is applied to the webbing winding device that compresses the compression coil spring toward the first spring engagement part.

[0012] In the webbing winding device according to the second embodiment, when the webbing is rapidly pulled out from the spool, the spool rotates rapidly in the pulling direction. Consequently, when the rotating body rotates in the pulling direction at a speed exceeding a predetermined speed, the operating member swings from the first position to the second position, and the restricting member is activated. This restricts the rotation of the spool in the pulling direction, thereby limiting the pulling of the webbing from the spool. Here, a compression coil spring is provided between the first spring engagement portion of the rotating body and the second spring engagement portion of the operating member, biasing the operating member toward the first position. Furthermore, a boss portion is provided on one of the first and second spring engagement portions, which is inserted into one side of the compression coil spring. In addition, a storage portion is provided on the other of the first and second spring engagement portions, which houses the other side of the compression coil spring. When the operating member is in the second position and the compression coil spring is fully compressed toward the second spring engagement portion, the displacement of the end of the compression coil spring on the first spring engagement portion side is restricted by the boss portion or the storage portion. This prevents the compression coil spring from coming out from between the first and second spring engagement parts when an impact is applied to the webbing winding device that compresses the compression coil spring toward the second spring engagement part.

[0013] In the webbing winding device according to the third embodiment, the end of the boss portion on the storage portion side is located inside the storage portion in all states from when the operating member is in the first position to when it is in the second position. This further suppresses the compression coil spring from coming out from between the first spring engagement portion and the second spring engagement portion.

[0014] In the webbing winding device according to the fourth embodiment, the storage section is provided on the second spring engagement section on the operating member side. This makes it possible to suppress the complexity of the manufacturing equipment and manufacturing process for the rotating body compared to a configuration in which the storage section is provided on the first spring engagement section on the rotating body side.

[0015] In the webbing winding device according to the fifth aspect, a recess with the boss part side open is formed at the end of the storage part on the boss part side. In this configuration, for example, a jig for compressing the compression coil spring toward the storage part side can be engaged with the recess. Thereby, the workability when setting the compression coil spring between the first spring engaging part and the second spring engaging part can be improved.

Brief Description of the Drawings

[0016] [Figure 1] It is an exploded perspective view showing the webbing winding device disassembled. [Figure 2] It is a front view showing the main part of the webbing winding device. [Figure 3] It is a front view corresponding to FIG. 2 showing the main part of the webbing winding device in a state where the W pulley contacts the restriction cover. [Figure 4] It is a cross-sectional view showing the cross-section of the main part of the webbing winding device cut along the 4-4 line shown in FIG. 2. [Figure 5] It is an enlarged perspective view showing an enlarged part where a return spring is provided in the V gear and the W pulley. [Figure 6] It is an enlarged front view showing an enlarged part where a return spring is provided in the V gear and the W pulley. ​​​​​​​​​​​​​​​​​​FIG. 1 shows an exploded perspective view of the webbing take-up device 10 as seen from the rear side, outside and obliquely above. In the drawing, the front side of the vehicle with the webbing take-up device 10 attached to the vehicle is indicated by arrow FR, the outside in the vehicle width direction is indicated by arrow OUT, and the upper side of the vehicle is indicated by arrow UP. Also, in the following description, when simply indicating the front-rear and up-down directions, the front-rear in the vehicle front-rear direction and the up-down in the vehicle up-down direction are indicated.

[0019] As shown in FIG. 1, the webbing take-up device 10 of the present embodiment includes a frame 12 formed in a substantially U-shape as seen from above the vehicle. This frame 12 includes a back plate 12A extending in the vehicle up-down direction with the vehicle width direction as the thickness direction, and leg plates 12B and 12C that bend and extend outward in the vehicle width direction from both ends in the vehicle front-rear direction of the back plate 12A and are arranged facing each other. Also, by fixing the back plate 12A of the frame 12 to the vehicle body, the webbing take-up device 10 is installed on the vehicle body.

[0020] Substantially circular arrangement holes 14 and 16 are respectively formed in the leg plates 12B and 12C, and the arrangement hole 14 and the arrangement hole 16 face each other in the vehicle front-rear direction. Also, ratchet teeth 14A (internal teeth) constituting the locking mechanism 18 are formed on the entire outer periphery of the arrangement hole 14.

[0021] A substantially cylindrical spool 20 is provided between the leg plates 12B and 12C of the frame 12. One end 20A on the rear side (leg plate 12B side) of the spool 20 is arranged in the arrangement hole 14 of the leg plate 12B, and the other end 20B on the front side (leg plate 12C side) of the spool 20 is arranged in the arrangement hole 16 of the leg plate 12C. Thereby, the spool 20 is rotatable in the circumferential direction in a state where its axial direction is parallel to the front-rear direction. Also, hereinafter, when simply indicating the axial direction, radial direction, and circumferential direction, unless otherwise specified, the rotational axial direction, rotational radial direction, and rotational circumferential direction of the spool are indicated.

[0022] The base end of a long, strip-shaped webbing 22 (belt) is secured to the spool 20, and the webbing 22 is wound onto the spool 20 from the base end. When the spool 20 rotates in the winding direction (circumferentially in one direction, indicated by arrow A in Figure 1), the webbing 22 is wound onto the spool 20. Conversely, when the webbing 22 is pulled out from the spool 20, the spool 20 rotates in the pulling direction (the other circumferentially in the direction of arrow B in Figure 1). The webbing 22 extends upward from the frame 12, and the webbing 22 is designed to be attached to an occupant seated in a vehicle (not shown).

[0023] A mainspring (not shown) is connected to the other end 20B of the spool 20, and the mainspring is located on the front side of the frame 12 (the front side of the landing gear plate 12C). The mainspring biases the spool 20 in the winding direction, thereby acting a biasing force on the webbing 22 in the winding direction of the spool 20. Therefore, when the webbing 22 is attached to a crew member, the biasing force of the mainspring removes any slack in the webbing 22, and when the webbing 22 is removed from the crew member, the biasing force of the mainspring causes the webbing 22 to be wound onto the spool 20.

[0024] A housing hole 24 is formed at one end 20A of the spool 20, with the radially outer side of the spool 20 being open. A long, plate-shaped lock pawl 26, which serves as a regulating member constituting the lock mechanism 18, is movably housed within the housing hole 24. A locking tooth 26A is formed at one end of the lock pawl 26. A cylindrical operating shaft 28 is integrally provided with the lock pawl 26, and the operating shaft 28 protrudes to the rear from the lock pawl 26.

[0025] A cylindrical rotating shaft 30 is integrally provided at the axial center of one end 20A of the spool 20. The rotating shaft 30 protrudes to the rear of the spool 20 and is positioned coaxially with the spool 20.

[0026] A sensor mechanism 32, which constitutes the locking mechanism 18, is provided on the rear side of the frame 12 (the rear side of the leg plate 12B).

[0027] The sensor mechanism 32 is made of a resin material and includes a substantially bottomed cylindrical sensor holder 34 that is open at the front (towards the leg plate 12B), and this sensor holder 34 is fixed to the leg plate 12B. The inner bottom surface of the sensor holder 34 is a flat friction surface 34A (see Figure 4), and the friction surface 34A is positioned perpendicular to the axial direction of the spool 20.

[0028] On the rear side of the sensor holder 34 (opposite the leg plate 12B), there is a roughly bottomed cylindrical sensor cover 36 made of resin material, with the front side open. The sensor cover 36 is fixed to the leg plate 12B with the sensor holder 34 housed inside.

[0029] A V-gear 38, which acts as a rotating body, is provided inside the sensor holder 34. This V-gear 38 is made of a resin material and is formed in a bottomed cylindrical shape with an open rear end. A cylindrical portion 38C is erected at the axial center of the bottom wall 38A of the V-gear 38, and the rotation shaft 30 of the spool 20 is inserted into the cylindrical portion 38C, allowing the V-gear 38 to rotate relative to the spool 20.

[0030] As shown in Figures 1 and 2, a long, slot-shaped operating groove 38E is formed in the bottom wall 38A of the V-gear 38, and the operating shaft 28 of the lock pawl 26 is inserted into the operating groove 38E. A compression coil spring 40 is interposed between the V-gear 38 and one end 20A of the spool 20. The compression coil spring 40 biases the V-gear 38 in the pulling direction relative to the spool 20 (biasing the spool 20 in the winding direction relative to the V-gear 38), causing the operating shaft 28 to contact one end of the longitudinal direction of the operating groove 38E. This prevents the V-gear 38 from rotating in the pulling direction relative to the spool 20 due to the biasing force of the compression coil spring 40, and allows the V-gear 38 to rotate around the rotation axis 30 of the spool 20 as the spool 20 rotates. In addition, ratchet teeth 38B (external teeth) are formed on the entire outer circumference of the V-gear 38. Here, a circumferential wall 38F is formed on the outer circumference of the V-gear 38, projecting in the direction of the rotation axis relative to the outer circumference of the bottom wall 38A. This circumferential wall 38F is formed in an annular shape when viewed from the direction of the rotation axis. The ratchet teeth 38B then project outward in the radial direction from the circumferential wall 38F.

[0031] A cylindrical pivot shaft 42 is erected on the bottom wall 38A of the V-gear 38, and the pivot shaft 42 is positioned radially outward with respect to the central axis of the V-gear 38. Furthermore, the central axis of the pivot shaft 42 and the central axis of the V-gear 38 are parallel.

[0032] As shown in Figure 2, a W-pole 44, acting as an operating member, is supported on the pivot shaft 42 so as to be pivotable (displaceable). More specifically, the W-pole 44 is formed in a semi-circular shape when viewed from the axial direction, and a pivot shaft insertion hole 44A into which the pivot shaft 42 is inserted is formed in the intermediate portion 44D of the W-pole 44 in the circumferential direction (circumferential direction of the V-gear 38). The other end of the W-pole 44 in the circumferential direction is an engaging portion 44B that engages with the engaged portion 34B of the sensor holder 34. Furthermore, one end of the W-pole 44 in the circumferential direction is a contact portion 44C that extends toward the limiting cover 70 side of the limiting body 66, which will be described later. This contact portion 44C is formed to gradually narrow towards one side in the circumferential direction, and the end face of the contact portion 44C on one side in the circumferential direction is a contact surface S1 that contacts the limiting cover 70.

[0033] Furthermore, a return spring 46, acting as a compression coil spring, is interposed between the W-pole 44 and the V-gear 38, and the return spring 46 biases the W-pole 44 in the return direction (direction of arrow C). In addition, the oscillation of the W-pole 44 in the return direction due to the biasing force of the return spring 46 is stopped by a restricting projection 38D provided on the V-gear 38. The position of the W-pole 44 when its oscillation in the return direction is stopped by the restricting projection 38D provided on the V-gear 38 will be referred to as the first return position.

[0034] When the V-gear 38 is rotated in the unwinding direction, an inertial force acts on the W-pole 44 in the winding direction relative to the V-gear 38. This causes the W-pole 44 to swing relative to the V-gear 38 in the operating direction (direction of arrow D). Furthermore, when the V-gear 38 is rapidly rotated in the unwinding direction, the inertial force acting on the W-pole 44 exceeds the biasing force of the return spring 46. As a result, the W-pole 44 swings relative to the V-gear 38 in the operating direction, and the engaging portion 44B of the W-pole 44 engages with the engaged portion 34B of the sensor holder 34. Consequently, the rotation of the V-gear 38 in the unwinding direction is stopped. The position of the W-pole 44 when the engaging portion 44B of the W-pole 44 can engage with the engaged portion 34B of the sensor holder 34 will be referred to as the operating position, which is the second position.

[0035] As shown in Figure 1, an acceleration sensor 48 is provided at the lower end of the sensor holder 34. The acceleration sensor 48 has a roughly U-shaped housing 50 that is open on the upper side when viewed from the front of the vehicle, and a concave curved surface 50A is formed on the upper surface of the bottom wall of the housing 50. A spherical ball 52 is placed on the curved surface 50A, and a roughly plate-shaped lever 54 is placed above the ball 52. The lever 54 is rotatably supported at its base end on the side wall of the housing 50, and a V-gear 38 is positioned above the tip of the lever 54. When the ball 52 rolls upward on the curved surface 50A of the housing 50, the lever 54 is rotated upward. As a result, the tip of the lever 54 engages with the ratchet teeth 38B of the V-gear 38, stopping the rotation of the V-gear 38 in the pulling direction.

[0036] As described above, when the rotation of the V-gear 38 in the pulling direction is stopped, and the spool 20 rotates in the pulling direction against the biasing force of the compression coil spring 40 relative to the V-gear 38, the operating shaft 28 of the lock pawl 26 moves to the other end in the longitudinal direction of the operating groove 38E of the V-gear 38, as shown in Figures 1 and 2. As a result, the lock pawl 26 moves radially outward from the spool 20 (one end 20A), and the locking teeth 26A of the lock pawl 26 engage with the ratchet teeth 14A of the frame 12 (leg plate 12B). Consequently, the rotation of the spool 20 in the pulling direction is locked (restricted), and the pulling out of the webbing 22 from the spool 20 is locked (restricted).

[0037] As shown in Figure 4, a cylindrical support shaft 56 is erected on the bottom wall 38A of the V-gear 38. The central axis of the support shaft 56 and the central axis of the V-gear 38 are parallel. A support hole 58 is formed in the axial center of the support shaft 56, and the support hole 58 is open to the rear side (towards the friction surface 34A of the sensor holder 34) while the front side is closed by the bottom wall 38A.

[0038] Furthermore, a limiting body 66 is rotatably supported on the support shaft 56. As shown in Figure 2, this limiting body 66 includes a friction spring 68 formed by bending a long rod-shaped member, and a limiting cover 70 and a friction cover 72 attached to the friction spring 68.

[0039] As shown in Figure 4, one end of the friction spring 68 is an insertion portion 68A that is inserted into and supported by the support hole 58, and the other end of the friction spring 68 is a friction cover mounting portion 68B to which the friction cover 72 is attached. Furthermore, the portion of the friction spring 68 between the insertion portion 68A and the friction cover mounting portion 68B, and on the insertion portion 68A side, is a limiting cover mounting portion 68C to which the limiting cover 70 (see Figure 2) is attached.

[0040] Furthermore, in the friction spring 68, the portion between the insertion portion 68A and the friction cover mounting portion 68B, and specifically the portion of the friction cover mounting portion 68B, is designated as a flexible portion 68D. When the limiting body 66 is positioned between the friction surface 34A side of the sensor holder 34 and the bottom wall 38A of the V-gear 38, the flexible portion 68D is bent. The elastic force of this flexible portion 68D makes it possible to press the friction cover 72 against the friction surface 34A of the sensor holder 34. As a result, when the V-gear 38 rotates, the friction cover 72 slides on the friction surface 34A, generating a frictional force between the friction cover 72 and the friction surface 34A.

[0041] As shown in Figure 2, the limiting cover 70 is made of a resin material and is formed in a substantially L-shape when viewed from the front. The limiting cover 70 includes a rectangular block-shaped mounting portion 70A that is attached to the limiting cover mounting portion 68C of the friction spring 68, and a contacted portion 70B that extends from one end of the mounting portion 70A toward the contact portion 44C of the W-pole 44. The end face of the contacted portion 70B is the contacted surface S2 that the contact portion 44C of the W-pole 44 contacts, and the contacted surface S2 is curved in an arc shape when viewed from the front.

[0042] When the V-gear 38 is rotated in the winding direction, the limiting body 66 is rotated to one side (towards arrow D) around the support shaft 56 (see Figure 4), and the limiting body 66 is rotated to the limiting position (the position shown by the solid line in Figure 2). Then, as shown in Figure 3, the contact portion 44C (contact surface S1) of the W-pole 44 comes into contact with the contacted portion 70B (contacted surface S2) of the limiting cover 70, thereby limiting the swing of the W-pole 44 in the operating direction relative to the V-gear 38.

[0043] As shown in Figure 2, when the V-gear 38 is rotated in the pulling direction, the limiting body 66 is rotated around the support shaft 56 (see Figure 4) to the other side (towards arrow C), and the limiting body 66 is rotated to the permissible position (the position shown by the dashed line in Figure 2). Then, even if the W-pole 44 swings, the contact portion 44C (contact surface S1) of the W-pole 44 does not come into contact with the contacted portion 70B (contacted surface S2) of the limiting cover 70, thereby allowing the W-pole 44 to swing in the operating direction relative to the V-gear 38.

[0044] (Operation and effects of this embodiment) Next, the operation and effects of this embodiment will be described.

[0045] In the webbing winding device 10 with the above configuration, the webbing 22 is pulled, causing the spool 20 and V-gear 38 to rotate in the pulling direction against the biasing force of the mainspring, thereby pulling the webbing 22 out from the spool 20 and attaching it to the crew member.

[0046] When the vehicle is suddenly decelerated, the ball 52 in the acceleration sensor 48 rolls upward on the curved surface 50A of the housing 50, causing the lever 54 to rotate upward and engage its tip with the ratchet teeth 38B of the V gear 38. This stops the V gear 38 from rotating in the pulling direction.

[0047] Furthermore, when the vehicle is rapidly decelerated, the occupants are moved by inertia, causing the webbing 22 to be pulled out from the spool 20, and the spool 20 and V-gear 38 to rotate rapidly in the pulling direction.

[0048] Furthermore, when the V-gear 38 is rotated in the pulling direction, the limiting body 66 is rotated by the frictional force generated between the friction surface 34A of the sensor holder 34 and the friction cover 72, and rotated to the permissible position (the position shown by the dashed line in Figure 2). As a result, the swing of the W-pole 44 in the operating direction relative to the V-gear 38 is permitted.

[0049] As a result, when the V-gear 38 is rapidly rotated in the pulling direction as described above, the W-pole 44 is swung in the operating direction relative to the V-gear 38, and the engaging portion 44B of the W-pole 44 engages with the engaged portion 34B of the sensor holder 34, thereby stopping the rotation of the V-gear 38 in the pulling direction.

[0050] Furthermore, when the rotation of the V-gear 38 in the extension direction is stopped, the spool 20 rotates in the extension direction against the biasing force of the compression coil spring 40 relative to the V-gear 38, causing the operating shaft 28 of the lock pawl 26 to move to the other end in the longitudinal direction of the operating groove 38E of the V-gear 38, and the lock pawl 26 to move radially outward from the spool 20. As a result, the locking teeth 26A of the lock pawl 26 engage with the ratchet teeth 14A of the frame 12, locking the rotation of the spool 20 in the extension direction. This locks the extension of the webbing 22 from the spool 20, and the occupant is restrained by the webbing 22.

[0051] On the other hand, when the webbing 22 is released from the crew member, the spool 20 and V-gear 38 are rotated in the winding direction by the biasing force of the mainspring, and the webbing 22 is wound onto the spool 20.

[0052] At this point, when winding the webbing 22 onto the spool 20 is complete, the spool 20 and V-gear 38 may rotate rapidly in the unwinding direction as a reaction to the cessation of their rotation in the winding direction.

[0053] Therefore, when the V-gear 38 is rotated in the winding direction, the limiting body 66 is rotated by the frictional force generated between the friction surface 34A of the sensor holder 34 and the friction cover 72, and moves to the limiting position (the position shown by the solid line in Figure 2). Then, as shown in Figure 3, the contact portion 44C (contact surface S1) of the W-pole 44 comes into contact with the contacted portion 70B (contacted surface S2) of the limiting cover 70, thereby limiting the swing of the W-pole 44 in the operating direction relative to the V-gear 38.

[0054] As a result, the engaging portion 44B of the W pawl 44 does not engage with the sensor holder 34, and the rotation of the V gear 38 in the pulling direction is not stopped, so the lock pawl 26 does not move radially outward of the spool 20. Therefore, the locking teeth 26A of the lock pawl 26 do not engage with the ratchet teeth 14A of the frame 12, and the rotation of the spool 20 in the pulling direction is not locked. In other words, in this embodiment, the locking of the webbing 22 from the spool 20 (so-called end lock) can be prevented or suppressed, and the webbing 22 can be pulled out from the spool 20.

[0055] (Configuration to improve shock resistance) Next, the configuration of the present invention applied to improve impact resistance will be described. Specifically, a configuration will be described to prevent the return spring 46 from coming out from between the V gear 38 and the W pawl 44 when the webbing winding device 10 is subjected to an impact, such as by dropping the webbing winding device 10.

[0056] As shown in Figures 5 and 6, the V-gear 38 is provided with a first spring engagement portion 80 into which one side of the return spring 46 engages. The W-pole 44 is also provided with a second spring engagement portion 90 into which the other side of the return spring 46 engages.

[0057] The first spring engagement portion 80 comprises an engagement wall portion 82 erected from the bottom wall 38A in the same direction as the pivot axis 42, and a boss portion 84 projecting from the engagement wall portion 82 toward the second spring engagement portion 90. The engagement wall portion 82 is formed in a U-shape with the second spring engagement portion 90 side open when viewed from the axial direction. More specifically, the engagement wall portion 82 is formed in a plate shape and includes a bottom wall portion 82A whose thickness direction is oriented toward the second spring engagement portion 90. The engagement wall portion 82 also includes a pair of side wall portions 82B extending toward the second spring engagement portion 90 from the end of the bottom wall portion 82A toward the cylindrical portion 38C and the end opposite to the cylindrical portion 38C, respectively. The boss portion 84 projects from the bottom wall portion 82A toward the second spring engagement portion 90 and is positioned in the center between the pair of side wall portions 82B. The base end of the boss portion 84 in the protruding direction is a cylindrical portion 84A whose outer diameter is set to a constant dimension in the protruding direction. Furthermore, the range of the boss portion 84 from the middle to the tip in the protruding direction is a frustoconical portion 84B whose outer diameter is set to gradually decrease as it approaches the protruding direction. Here, as shown in Figure 5, a through hole 86 is formed in the bottom wall 38A of the V-gear 38 in the axial direction in the portion that overlaps with the boss portion 84 (see Figure 6). Note that the through hole 86 is not shown in Figure 6.

[0058] As shown in Figures 5 and 6, the second spring engagement portion 90 comprises a box-shaped storage portion 92 with the bottom wall 38A side of the V-gear 38 and the first spring engagement portion 80 side open, and a boss portion 94 protruding from the storage portion 92 toward the first spring engagement portion 80 side. The storage portion 92 has a bottom wall portion 92A on which a part of its surface is oriented toward the first spring engagement portion 80 side. The storage portion 92 also has a pair of first side wall portions 92B extending toward the first spring engagement portion 80 side from the end of the bottom wall portion 92A toward the pivot shaft insertion hole 44A side and the end opposite to the pivot shaft insertion hole 44A, respectively. The portion 92B1 of the first side wall portion 92B opposite to the pivot shaft insertion hole 44A toward the first spring engagement portion 80 side is inclined toward the opposite side of the pivot shaft insertion hole 44A as it approaches the first spring engagement portion 80 side. Furthermore, the storage section 92 includes a second side wall section 92C connected to the end of the pair of first side wall sections 92B opposite to the bottom wall 38A of the V-gear 38 and to the end of the bottom wall section 92A opposite to the bottom wall 38A of the V-gear 38. The return spring 46 is positioned in the space (space within the storage section 92) surrounded by the bottom wall section 92A, the pair of first side wall sections 92B, and the second side wall section 92C. In addition, a pair of recesses 92D are formed at the end of the second side wall section 92C on the side of the first spring engagement section 80, with the first spring engagement section 80 side (boss section 84 side) open. The portion between the pair of recesses 92D in the second side wall section 92C is a tongue-shaped tongue section 92E. The boss section 94 protrudes from the bottom wall section 92A toward the first spring engagement section 80 and is positioned in the center between the pair of first side wall sections 92B. The base end of the boss portion 94 in the protruding direction is a cylindrical portion 94A whose outer diameter is set to a constant dimension in the protruding direction. The tip end of the boss portion 94 in the protruding direction is a frustoconical portion 94B whose outer diameter is set to gradually decrease as it approaches the protruding direction. Here, the dimension of the boss portion 94 on the second spring engagement portion 90 side in the protruding direction is set to be smaller than the dimension of the boss portion 84 on the first spring engagement portion 80 side in the protruding direction. In this embodiment, the boss portion 94 is covered from the side opposite to the bottom wall 38A of the V-gear 38 by the second side wall portion 92C of the storage portion 92.In contrast, the boss section 94 is not covered by a part of the storage section 92 from the bottom wall 38A side of the V-gear 38. In other words, the storage section 92 has no wall on the bottom wall 38A side of the V-gear 38.

[0059] As shown in Figure 6, in order to assemble the return spring 46 to the first spring engagement portion 80 and the second spring engagement portion 90, first, the boss portion 94 of the second spring engagement portion 90 is inserted into the other side of the return spring 46. Then, with the return spring 46 compressed toward the bottom wall portion 92A of the storage portion 92, the entire return spring 46 is placed inside the storage portion 92. A set jig 96 is locked into a pair of recesses 92D of the storage portion 92. This ensures that the entire return spring 46 is placed inside the storage portion 92.

[0060] Next, the W-pole 44, with the entire return spring 46 positioned inside the storage section 92, is assembled to the V-gear 38, and the set jig 96 is removed. As a result, the return spring 46 inside the storage section 92 extends due to its restoring force, and the boss portion 84 of the first spring engagement portion 80 is inserted into one side of the return spring 46, as shown by the dashed line in Figure 6. Consequently, the return spring 46 is stretched between the first spring engagement portion 80 and the second spring engagement portion 90. In other words, the return spring 46 is assembled to the first spring engagement portion 80 and the second spring engagement portion 90.

[0061] Here, the W-pole 44 shown in Figure 6 is in the return position. When the W-pole 44 is in the return position, the end of the boss portion 84 on the storage portion 92 side is located inside the storage portion 92. Therefore, in this embodiment, in all states from the return position to the operating position of the W-pole 44, the end of the boss portion 84 on the storage portion 92 side is located inside the storage portion 92.

[0062] Figure 7 also shows the V-gear 38, W-pole 44, and return spring 46 when an impact is input to the webbing winding device 10 from the second spring engagement portion 90 to the first spring engagement portion 80, such as by dropping the webbing winding device 10. As shown in this figure, when an impact is input to the webbing winding device 10 from the second spring engagement portion 90 to the first spring engagement portion 80, the inertial force acting on the return spring 46 compresses the return spring 46 toward the first spring engagement portion 80. Also, when an impact is input to the webbing winding device 10 from the second spring engagement portion 90 to the first spring engagement portion 80, the inertial force acting on the W-pole 44 biases the W-pole 44 toward the regulating projection 38D. That is, the state in which the W-pole 44 is in the return position is maintained. Here, in Figure 7, the return spring 46 is shown in a state where it is fully compressed toward the first spring engagement portion 80. Even in this state, the end of the return spring 46 on the side of the second spring engagement portion 90 is located inside the storage portion 92.

[0063] Figure 8 also shows the V-gear 38, W-pole 44, and return spring 46 when an impact is input to the webbing winding device 10 from the first spring engagement part 80 to the second spring engagement part 90, such as by dropping the webbing winding device 10. As shown in this figure, when an impact is input to the webbing winding device 10 from the first spring engagement part 80 to the second spring engagement part 90, the inertial force acting on the return spring 46 compresses the return spring 46 toward the second spring engagement part 90. Also, when an impact is input to the webbing winding device 10 from the first spring engagement part 80 to the second spring engagement part 90, the inertial force acting on the W-pole 44 displaces the W-pole 44 toward the operating position. Here, in Figure 8, the return spring 46 is shown in a state where it is fully compressed toward the second spring engagement part 90. Even in this state, the boss portion 84 of the first spring engagement portion 80 is inserted into the end of the return spring 46 on the side of the first spring engagement portion 80.

[0064] In the webbing winding device 10 to which the configuration of the present invention described above is applied, as shown in Figure 7, when the return spring 46 is fully compressed toward the first spring engagement portion 80, the end of the return spring 46 toward the second spring engagement portion 90 is located inside the storage portion 92. As a result, when an impact is applied to the webbing winding device 10 that compresses the return spring 46 toward the first spring engagement portion 80, the displacement of the end of the return spring 46 toward the second spring engagement portion 90 is limited by the storage portion 92. This prevents the return spring 46 from coming out from between the first spring engagement portion 80 and the second spring engagement portion 90.

[0065] Furthermore, as shown in Figure 8, when the return spring 46 is fully compressed toward the second spring engagement portion 90, the boss portion 84 of the first spring engagement portion 80 is inserted into the end of the return spring 46 on the first spring engagement portion 80 side. As a result, when an impact is applied to the webbing winding device 10 that compresses the return spring 46 toward the second spring engagement portion 90, the displacement of the end of the return spring 46 on the first spring engagement portion 80 side is limited by the boss portion 84. This prevents the return spring 46 from coming out from between the first spring engagement portion 80 and the second spring engagement portion 90.

[0066] Furthermore, in the webbing winding device 10 to which the configuration of the present invention is applied, as shown in Figure 6, in all states from when the W pawl 44 is in the return position to when it is in the operating position, the end of the boss portion 84 on the storage portion 92 side is located inside the storage portion 92. This further suppresses the return spring 46 from coming out from between the first spring engagement portion 80 and the second spring engagement portion 90.

[0067] Furthermore, in the webbing winding device 10 to which the configuration of the present invention is applied, a box-shaped storage section 92 is provided on the second spring engagement section 90 of the W pole 44. This makes it possible to suppress the complexity of the manufacturing equipment and manufacturing process of the V gear 38 compared to a configuration in which the box-shaped storage section 92 is provided on the first spring engagement section 80 of the V gear 38. Specifically, in a configuration in which the box-shaped storage section 92 is provided on the first spring engagement section 80 of the V gear 38, it is not necessary to provide a sliding mold (a sliding mold that slides along the pair of first side wall sections 92B and second side wall sections 92C that constitute the storage section 92) for forming the box-shaped storage section 92 in the mold for forming the V gear 38. As a result, the step of displacing the sliding mold in the process of forming the V gear 38 can be eliminated.

[0068] Furthermore, in the webbing winding device 10 to which the configuration of the present invention is applied, as shown in Figure 5, a through hole 86 is formed in the bottom wall 38A of the V-gear 38 in the portion that overlaps with the boss portion 84 (see Figure 6) in the axial direction, and the through hole 86 penetrates the bottom wall 38A in the axial direction. The formation of this through hole 86 eliminates the need for a sliding mold to form the boss portion 84. In other words, in the webbing winding device 10 to which the configuration of the present invention is applied, the V-gear 38 can be formed by an upper mold and a lower mold that are divided in the axial direction.

[0069] Furthermore, in the webbing winding device 10 to which the configuration of the present invention is applied, as shown in Figure 6, the setting jig 96 can be locked into a pair of recesses 92D of the storage section 92. This allows the entire return spring 46 to remain positioned within the storage section 92. As a result, the workability when setting the return spring 46 between the first spring engagement section 80 and the second spring engagement section 90 can be improved.

[0070] In the webbing winding device 10 to which the configuration of the present invention is applied, an example has been described in which the set jig 96 can be locked into a pair of recesses 92D of the storage section 92, but the present invention is not limited to this. Whether or not to provide a pair of recesses 92D can be determined as appropriate considering the assembly process of the webbing winding device 10, etc.

[0071] Furthermore, while an example has been described in which a box-shaped storage section 92 is provided on the second spring engagement section 90 of the W-pole 44 and a boss section 84 is provided on the first spring engagement section 80 of the V-gear 38 in a webbing winding device 10 to which the configuration of the present invention is applied, the present invention is not limited to this. For example, a configuration in which a box-shaped storage section 92 is provided on the first spring engagement section 80 of the V-gear 38 and a boss section 84 is provided on the second spring engagement section 90 of the W-pole 44 may also be used.

[0072] Furthermore, although an example has been described in which the boss portion 94 is provided on the second spring engagement portion 90 of the W pole 44 in the webbing winding device 10 to which the configuration of the present invention is applied, the present invention is not limited to this. For example, a configuration in which the boss portion 94 is omitted may also be used.

[0073] Furthermore, while an example has been described in which the webbing winding device 10 to which the configuration of the present invention is applied is configured such that the end of the boss portion 84 on the storage portion 92 side is located inside the storage portion 92 in all states from the state in which the W-pole 44 is located to the state in which it is located, the present invention is not limited to this. For example, the boss portion 84 may be located outside the storage portion 92 in some or all states from the state in which the W-pole 44 is located to the state in which it is located,

[0074] Furthermore, while the present invention has described an example in which the webbing winding device 10 to which the configuration of the present invention is applied is prevented from disengaging from between the first spring engagement portion 80 and the second spring engagement portion 90 in both the case shown in Figure 7 and the case shown in Figure 8, the present invention is not limited thereto. For example, in either the case shown in Figure 7 or the case shown in Figure 8, the return spring 46 may be prevented from disengaging from between the first spring engagement portion 80 and the second spring engagement portion 90.

[0075] 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]

[0076] 20 spools 22 Webbing 26. Lock pole (regulating member) 38 V-gear (rotating body) 44 W-pole (operating component) 46. ​​Return spring (compression coil spring) 80 First spring engagement portion 84 Boss Section 90 Second spring engagement portion 92 Storage Unit 92D recess

Claims

1. A spool is provided that allows the webbing attached to the crew member to be wound up, and when the spool rotates in the winding direction, the webbing is wound up, and when the webbing is pulled out, the spool rotates in the pulling direction, A rotating body having a first spring engagement portion is made rotatable in conjunction with the rotation of the spool, A restricting member that, when activated, restricts the rotation of the spool in the pulling direction, An operating member having a second spring engagement portion is supported by the rotating body and is pivotable relative to the rotating body, and when the rotating body is rotated in the withdrawal direction at a speed greater than a predetermined speed, it pivots from the first position to the second position to activate the restricting member, A compression coil spring is provided between the first spring engagement portion and the second spring engagement portion, and biases the operating member toward the first position. A boss portion is provided on one of the first spring engagement portion and the second spring engagement portion and is inserted into one side of the compression coil spring, A storage section is provided on the other side of the first spring engagement portion and the second spring engagement portion, and the other side of the compression coil spring is stored therein. Equipped with, A webbing winding device in which, when the operating member is in the first position and the compression coil spring is fully compressed toward the first spring engagement portion, the displacement of the end of the compression coil spring toward the second spring engagement portion is limited by the boss portion or the storage portion.

2. A spool is provided that allows the webbing attached to the crew member to be wound up, and when the spool rotates in the winding direction, the webbing is wound up, and when the webbing is pulled out, the spool rotates in the pulling direction, A rotating body having a first spring engagement portion is made rotatable in conjunction with the rotation of the spool, A restricting member that, when activated, restricts the rotation of the spool in the pulling direction, An operating member having a second spring engagement portion is supported by the rotating body and is pivotable relative to the rotating body, and when the rotating body is rotated in the withdrawal direction at a speed greater than a predetermined speed, it pivots from the first position to the second position to activate the restricting member, A compression coil spring is provided between the first spring engagement portion and the second spring engagement portion, and biases the operating member toward the first position. A boss portion is provided on one of the first spring engagement portion and the second spring engagement portion and is inserted into one side of the compression coil spring, A storage section is provided on the other side of the first spring engagement portion and the second spring engagement portion, and the other side of the compression coil spring is stored therein. Equipped with, A webbing winding device in which, when the operating member is in the second position and the compression coil spring is fully compressed toward the second spring engagement portion, the displacement of the end of the compression coil spring toward the first spring engagement portion is limited by the boss portion or the storage portion.

3. The webbing winding device according to claim 1 or claim 2, wherein in all states from the state in which the operating member is located to the state in which it is located, the end of the boss portion on the storage portion side is located inside the storage portion.

4. The webbing winding device according to claim 1 or claim 2, wherein the storage portion is provided in the second spring engagement portion.

5. The webbing winding device according to claim 1 or claim 2, wherein a recess is formed at the end of the storage section on the boss side, with the boss side being open.

Images