Braided tape take-up device

Abstract

A tape winding device is provided in which a movement path of a moving member is changed. In the tape winding device (10), a moving member (32) moves and engages with a rotating member (20), thereby causing the rotating member (20) to rotate, and a tape shaft (14) is rotated in a winding direction A of a tape. Here, a change mechanism changes a movement path (24) of the moving member (32) between a front side and a rear side. Thus, the movement path (24) of the moving member (32) can be changed.

Description

Technical Field

[0001] The present invention relates to a webbing winding device that rotates the webbing axially in the winding direction by moving a moving member. Background Technology

[0002] In the webbing winding device described in Patent Document 1 below, the moving member moves and engages with the rotating member, thereby rotating the rotating member and causing the webbing axis to rotate in the winding direction.

[0003] Here, in this webbing winding device, the movement path of the moving component is set to be constant.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2017-218093 Summary of the Invention

[0005] In view of the above-mentioned situation, the present invention aims to provide a webbing winding device that can change the movement path of the moving member.

[0006] The first aspect of the present invention provides a webbing winding device comprising: a belt shaft that rotates in a winding direction to wind up a webbing worn by an occupant; a rotating member that rotates to rotate the belt shaft in the winding direction; a moving member that moves and engages with the rotating member to rotate the rotating member; and a changing mechanism that changes the movement path of the moving member.

[0007] In the second embodiment of the webbing winding device of the present invention, based on the first embodiment of the webbing winding device of the present invention, the changing mechanism changes the movement path of the moving member to change the engagement amount of the rotating member with the moving member in the rotational radial direction.

[0008] In the third embodiment of the webbing winding device of the present invention, based on the first or second embodiment of the webbing winding device of the present invention, the changing mechanism changes the movement path of the moving member to change the engagement amount of the rotating member engaging with the moving member in the circumferential direction.

[0009] According to the fourth aspect of the present invention, the webbing winding device is based on any of the first to third aspects of the present invention, and includes: a path member that forms a movement path of the moving member; and a changing member that is disposed in the changing mechanism, supports the path member, and moves to move the path member.

[0010] In the fifth embodiment of the webbing winding device of the present invention, based on the fourth embodiment of the webbing winding device of the present invention, the moving member moves to move the path member.

[0011] In the sixth embodiment of the present invention, the movement path of the moving member is branched based on the webbing winding device of any one of the first to fifth embodiments of the present invention.

[0012] In the webbing winding device of the first aspect of the present invention, the webbing axis rotates in the winding direction, causing the webbing worn by the occupant to be wound toward the belt axis. Furthermore, the moving member moves and engages with the rotating member, thereby causing the rotating member to rotate and the webbing axis to rotate in the winding direction.

[0013] Here, changing the mechanism alters the movement path of the moving component. Therefore, it is possible to change the movement path of the moving component.

[0014] In the webbing winding apparatus of the second aspect of the present invention, the changing mechanism alters the movement path of the moving member, thereby changing the engagement amount of the rotating member with the moving member in the rotational radial direction. Therefore, it is possible to change the torque of the rotating member generated by the movement of the moving member.

[0015] In the webbing winding apparatus of the third aspect of the present invention, the changing mechanism alters the movement path of the moving member, thereby changing the engagement amount of the rotating member with the moving member in the circumferential direction. Therefore, the torque of the rotating member generated by the movement of the moving member can be changed.

[0016] In the fourth embodiment of the webbing winding apparatus of the present invention, the path member forms the movement path of the moving member, and the changing member of the changing mechanism supports the path member, and the path member is moved by changing the member's movement. Therefore, the movement path of the moving member can be changed.

[0017] In the fifth embodiment of the webbing winding apparatus of the present invention, the moving member moves to move the path member. Therefore, the structure for moving the path member can be simplified.

[0018] In the webbing winding apparatus of the sixth aspect of the present invention, the movement path of the moving member is branched. Therefore, the movement path of the moving member can be appropriately changed. Attached Figure Description

[0019] Figure 1 This is a perspective view of the webbing winding device according to the first embodiment of the present invention, viewed from a left rear oblique position.

[0020] Figure 2 This is a rear view showing the webbing winding device according to the first embodiment of the present invention as viewed from the rear.

[0021] Figure 3 (A) and (B) are cross-sectional views taken from the left of the pre-tensioning mechanism of the webbing winding device according to the first embodiment of the present invention. Figure 3(A) represents the whole. Figure 3 (B) shows the main part in an enlarged view.

[0022] Figure 4 (A) is a cross-sectional view taken from the right, showing the pre-tensioning mechanism of the webbing winding device according to the first embodiment of the present invention. Figure 4 (B) is a cross-sectional view taken from the right, showing the changing mechanism of the webbing winding device.

[0023] Figure 5 (A) is a cross-sectional view viewed from the right, showing the operation of the pretension mechanism changing mechanism of the webbing winding device according to the first embodiment of the present invention. Figure 5 (B) is a cross-sectional view viewed from the right when the mechanism is in operation.

[0024] Figure 6 This is a perspective view of the webbing winding device according to the second embodiment of the present invention, viewed from a left rear oblique position.

[0025] Figure 7 This is a rear view showing the webbing winding device according to the second embodiment of the present invention, viewed from the rear.

[0026] Figure 8 (A) is a cross-sectional view taken from the right, showing the pre-tensioning mechanism of the webbing winding device according to the second embodiment of the present invention. Figure 8 (B) is a cross-sectional view taken from the rear, showing the changing mechanism of the webbing winding device.

[0027] Figure 9 (A) is a cross-sectional view viewed from the right, showing the operation of the pretension mechanism changing mechanism of the webbing winding device according to the second embodiment of the present invention. Figure 9 (B) is a cross-sectional view taken from the rear when the mechanism is in operation.

[0028] Figure 10 This is a perspective view of the webbing winding device according to the third embodiment of the present invention, viewed from a left rear oblique position.

[0029] Figure 11 This is a rear view showing the webbing winding device according to the third embodiment of the present invention, viewed from the rear.

[0030] Figure 12 This is a cross-sectional view taken from the left of the pre-tensioning mechanism of the webbing winding device according to the third embodiment of the present invention.

[0031] Figure 13This is a cross-sectional view viewed from the left, showing the operation of the pre-tensioning mechanism changing mechanism of the webbing winding device according to the third embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures

[0033] 10...Webbing winding device; 14...Belt shaft; 16...Webbing; 20...Rotating component; 26...Guide (path component); 32...Moving component; 34...Changing mechanism; 42...Changing component; 50...Webbing winding device; 60...Webbing winding device. Detailed Implementation

[0034] [First Embodiment]

[0035] Figure 1 In the figure, a perspective view taken from a left rear oblique position shows the webbing winding device 10 according to the first embodiment of the present invention. Figure 2 The webbing winding device 10 is shown in the rear view as seen from the rear. Additionally, in the accompanying drawings, arrow FR indicates the front of the webbing winding device 10, arrow LH indicates the left side of the webbing winding device 10, and arrow UP indicates the top of the webbing winding device 10.

[0036] The webbing winding device 10 described in this embodiment constitutes a seat belt device, which is applied to a vehicle seat (not shown). A sensor is installed in the seat to detect the physique (e.g., weight) of the occupant sitting in the seat.

[0037] like Figure 1 and Figure 2 As shown, a frame 12 with a roughly U-shaped cross section is provided in the webbing winding device 10, and a back plate 12A, a leg plate 12B, and a leg plate 12C are respectively provided on the rear, left, and right sides of the frame 12.

[0038] A generally cylindrical belt shaft 14 is supported between the leg plates 12B and 12C of the frame 12 so that it can rotate, and the axis of the belt shaft 14 is set in the left and right direction.

[0039] The long strip of webbing 16 is wound up from the base end along its long side to the bobbin 14, with the bobbin 14 moving in the winding direction A (refer to...). Figure 1 (etc.) rotate, causing the webbing 16 to be wound onto the belt shaft 14, and the belt shaft 14 moves in the pulling direction B (refer to) Figure 1 (etc.) rotate, causing the webbing 16 to be pulled out from the belt shaft 14. The webbing 16 is pulled upward from the belt shaft 14 and worn by the occupant sitting in the seat.

[0040] A pre-tightening mechanism 18 is provided on the left side of frame 12.

[0041] The pretensioning mechanism 18 is equipped with a metal, generally cylindrical rotating component 20 (see reference). Figure 3 (A) The rotating member 20 is coaxially disposed on the left side of the belt shaft 14 and is connected to the belt shaft 14 in a manner that allows it to rotate integrally with the belt shaft 14. On the outer periphery of the axial middle portion of the rotating member 20, a plurality of generally triangular prism-shaped engaging teeth 20A are integrally provided as engaging portions. The plurality of engaging teeth 20A are arranged at equal intervals in the circumferential direction of the rotating member 20. The engaging teeth 20A protrude radially outward from the rotating member 20, and the circumferential dimension of the rotating member 20 decreases as the engaging teeth 20A move radially outward. The axial ends of the rotating member 20 are coaxially expanded in diameter, and the engaging teeth 20A are disposed between the axial ends of the rotating member 20.

[0042] A metal, generally rectangular box-shaped cover plate 22 is fixed to the left side of the frame 12. The cover plate 22 serves as a path body and opens to the right. Furthermore, the front portions of the lower and upper walls of the cover plate 22 are concave towards the outer periphery of the cover plate 22 in the front-rear direction. A generally rectangular recess 22A is formed in the lower part of the rear wall of the cover plate 22. The front of the recess 22A is open into the cover plate 22, and the left and right sides are closed by the bottom wall (left wall) of the cover plate 22 and the leg plate 12B of the frame 12, respectively. A movement path 24 is formed from the rear part of the cover plate 22 through the lower and front parts to the upper part. The side walls of the cover plate 22 (rear wall (excluding the recess 22A), lower wall, front wall, and upper wall) form the movement path 24.

[0043] A metal, generally rectangular parallelepiped-shaped guide 26 is disposed within the recess 22A. The guide 26 serves as a path member, fitting into the recess 22A, and its front surface forms the rear surface of the cover plate 22. A generally rectangular columnar movable post 26A is integrally formed on the rear surface of the guide 26, penetrating and fitting into the bottom wall (rear wall) of the recess 22A. The guide 26 is positioned at the front and is capable of rearward movement, although this rearward movement is restricted, as will be described later. Furthermore, the front surface of the guide 26 forms a movement path 24 within the cover plate 22 on the rear side of the rear portion of the cover plate 22.

[0044] On the upper side of the frame 12, a metal, generally cylindrical cylinder 28 is disposed as a guide. The cylinder 28 is bent at several points in the axial middle section. The axial end of the cylinder 28 extends downward and is fixed between the rear part of the leg plate 12B of the frame 12 and the rear part of the cover plate 22. The axial end of the cylinder 28 is open downward in the upper and rear parts inside the cover plate 22.

[0045] An MGG30 (micro gas generator) as a moving device is inserted and fixed inside the axial base end of the cylinder 28. When the MGG30 is working, it instantly generates high-pressure gas and supplies the gas into the cylinder 28.

[0046] Inside the cylinder 28, and on the side closer to the axial end than the MGG30, there is a roughly elongated cylindrical moving member 32 (see reference). Figure 3 (A) The movable component 32 is made of resin and is flexible, and is generally fitted into the cylinder 28.

[0047] On the left side of frame 12, and at the rear of cover plate 22, a changing mechanism 34 is provided (see reference). Figure 4 (A) and (B)).

[0048] The changing mechanism 34 is provided with a metal cylindrical changing cylinder 36, which is fixed to the left side of the leg plate 12B of the frame 12, and its axis is generally vertical. A changing MGG38 (changing micro gas generator) as a changing device is inserted and fixed in the lower end (axial base end) of the changing cylinder 36. When the changing MGG38 is working, it instantaneously generates high-pressure gas and supplies the gas into the changing cylinder 36.

[0049] Inside the cylinder 28, and on the upper side (axial end side) of the MGG38, a metal, generally rectangular columnar piston 40 is fitted, which is capable of moving upward.

[0050] Inside the cylinder 28, and above the piston 40, a metal (particularly iron) and generally rectangular plate-shaped alteration member 42 is inserted, restricting its rearward movement. The lower end of the alteration member 42 is positioned approximately perpendicular to the vertical direction. The alteration member 42 is positioned above the piston 40 and can move upward a predetermined distance. The alteration member 42 is configured such that its upper and lower portions are approximately perpendicular to the longitudinal direction, and are curved between the upper and lower portions. The upper portion of the alteration member 42 is positioned further forward than its lower portion. The peripheral wall of the recess 22A of the cover plate 22 is inserted into the upper part of the cylinder 28 from the front, and the moving post 26A of the guide 26 of the recess 22A abuts against the upper part of the alteration member 42 from the front. Therefore, the rearward movement of the guide 26 is restricted.

[0051] Next, the function of this embodiment will be explained.

[0052] In the webbing winding device 10 with the above structure, upon vehicle collision (when a collision is detected), the MGG30 in the pretensioning mechanism 18 operates, and the MGG30 instantaneously supplies high-pressure gas into the cylinder 28. As a result, the moving member 32 within the cylinder 28 moves towards the axial end of the cylinder 28 due to the pressure of the gas, and extends downward from the axial end of the cylinder 28. Furthermore, the moving member 32 moves along the side wall of the cover plate 22 within the cover plate 22, moving downward at the rear of the cover plate 22, forward at the lower part of the cover plate 22, upward at the front of the cover plate 22, and rearward at the upper part of the cover plate 22, moving along the movement path 24 within the cover plate 22.

[0053] When the moving member 32 moves downward at its rear within the cover plate 22, it passes downward between the rear of the axially intermediate portion of the rotating member 20 and the guide 26 of the rear wall of the cover plate 22. The engaging teeth 20A at the rear of the rotating member 20 engage (insert) with the moving member 32 (see reference). Figure 3 (B) Thus, the rotating member 20 is rotated in the winding direction A by the moving member 32, and the belt shaft 14 rotates integrally with the rotating member 20 in the winding direction A. Therefore, the webbing 16 is wound towards the belt shaft 14, increasing the restraining force of the webbing 16 on the occupant. In addition, the moving member 32 does not engage with the engaging teeth 20A at the position after passing between the rear part of the axial middle portion of the rotating member 20 and the guide member 26.

[0054] When the seat sensor detects a collision involving a large occupant (when a collision is detected), at the alteration mechanism 34, by disabling the alteration MGG38, the moving post 26A of the guide 26 on the rear wall of the cover 22 abuts against the upper part of the alteration member 42, thus restricting the rearward movement of the guide 26 (see reference). Figure 4 (A) and (B)). Therefore, the guide 26 is positioned at the front, reducing the distance between the guide 26 and the engaging teeth 20A at the rear of the rotating member 20, thereby increasing the engagement amount (insertion amount, overlap amount) of the engaging teeth 20A with the moving member 32. As a result, the torque in the winding direction A generated by the movement of the moving member 32 on the rotating member 20 and the belt shaft 14 increases, and the winding force of the webbing 16 winding towards the belt shaft 14 increases (becomes high power), thereby enabling the webbing 16 to properly restrain large occupants.

[0055] When the seat sensor detects a collision involving a small-sized occupant (when a collision is detected), at the alteration mechanism 34, the alteration MGG38 operates. The alteration MGG38 instantaneously supplies high-pressure gas to the alteration cylinder 36, causing the piston 40 within the alteration cylinder 36 to move upwards due to the gas pressure. This piston 40 then causes the alteration member 42 to move upwards (see reference). Figure 5 (A) and (B)). Therefore, by moving member 32, guide 26 is moved rearward, and the moving post 26A of guide 26 abuts against the lower part of changing member 42. Guide 26 is positioned rearward, thereby increasing the distance between guide 26 and the engaging teeth 20A at the rear of rotating member 20, and decreasing the engagement amount (insertion amount, overlap amount) of engaging teeth 20A towards moving member 32. As a result, the torque in the winding direction A generated by the movement of moving member 32 on rotating member 20 and belt shaft 14 decreases, and the winding force of webbing 16 towards belt shaft 14 decreases (power reduction), thereby enabling proper restraint of webbing 16 on small-sized occupants.

[0056] Here, for the changing mechanism 34, by disabling the changing MGG38, the guide 26 is positioned at the front, and the movement path 24 of the moving member 32 at the rear of the cover plate 22 is at the front. Conversely, by activating the changing MGG38, the guide 26 is positioned at the rear, and the movement path 24 of the moving member 32 at the rear of the cover plate 22 is at the rear. Therefore, the movement path 24 of the moving member 32 at the rear of the cover plate 22 can be changed.

[0057] Furthermore, the changing mechanism 34 alters the movement path 24 of the moving member 32, thereby changing the engagement amount of the rotating member 20 (engaging teeth 20A) with the moving member 32 in the rotational radial direction. Therefore, the torque of the rotating member 20 generated by the movement of the moving member 32 can be changed, and the winding force of the webbing 16 winding towards the belt shaft 14 can be changed (it can be switched). Moreover, since only the movement path 24 of the moving member 32 is changed, no additional components or structures for the rotating member 20 and its bearings are required.

[0058] Furthermore, regarding the changing mechanism 34, the moving post 26A of the guide 26 abuts against the upper part of the changing member 42. The guide 26 is positioned at the front, and when the changing member 42 moves to the upper side, the moving post 26A of the guide 26 abuts against the lower part of the changing member 42, allowing the guide 26 to move to the rear position. Therefore, the movement path 24 of the moving member 32 can be changed with a simple structure, enabling miniaturization of the changing mechanism 34. Moreover, the changing member 42 can be moved simply by changing the MGG38. Therefore, the output of the changing MGG38 can be reduced, lowering its cost.

[0059] Furthermore, by moving the moving member 32, the moving member 32 presses against the guide member 26, thereby moving the guide member 26. Therefore, other means of moving the guide member 26 are not required, and the structure for moving the guide member 26 can be simplified.

[0060] [Second Embodiment]

[0061] Figure 6 In the figure, a perspective view taken from a left rear oblique position shows the webbing winding device 50 according to the second embodiment of the present invention. Figure 7 The webbing winding device 50 is shown in the rear view, viewed from the rear.

[0062] The webbing winding device 50 involved in this embodiment has a generally similar structure to the first embodiment described above, but differs in the following aspects.

[0063] like Figure 6 and Figure 7 As shown, for the pre-tensioning mechanism 18 of the webbing winding device 50 according to this embodiment, the changing mechanism 34 is located on the right side of the leg plate 12B of the frame 12 and on the rear side of the cover plate 22, and the changing cylinder 36 of the changing mechanism 34 is fixed to the right side of the leg plate 12B of the frame 12.

[0064] On the rear surface of the guide member 26 within the recess 22A of the cover plate 22, a pair of rectangular plate-shaped movable plates 26B are integrally provided instead of the movable column 26A (see reference). Figure 9 (B)). The movable plate 26B is disposed on the upper and lower parts of the right side portion of the rear surface of the guide 26, the movable plate 26B protrudes rearward and extends in the left-right direction.

[0065] Modifying component 42 of mechanism 34 (see reference) Figure 8 (A) and (B) adopt a roughly cross-shaped plate shape, and the middle part (middle part in the left-right direction) of the changing member 42 expands to both sides in the roughly vertical direction. The middle part of the changing member 42 fits into the arrangement recess 22A of the cover plate 22 in the roughly vertical direction, and the changing member 42 is positioned on the right side. The left part of the changing member 42 passes through and fits into the left wall of the arrangement recess 22A, and the changing member 42 can move to the left. The right part of the changing member 42 passes through the leg plate 12B of the frame 12 and the peripheral wall of the changing cylinder 36, and the right end face of the changing member 42 is disposed in the changing cylinder 36. The right end face of the changing member 42 is disposed above the piston 40 in the changing cylinder 36, and the right end face of the changing member 42 is inclined in a direction that tends to the left as it tends to the lower side. A pair of movable plates 26B on the rear surface of the guide 26 abut against the middle part of the changing member 42 from the front side, thereby restricting the rearward movement of the guide 26 and positioning the guide 26 in the front side position.

[0066] However, when the seat sensors detect a collision involving a large occupant (when a collision is detected), at the alteration mechanism 34, the alteration MGG38 does not operate, causing a pair of movable plates 26B of the guide 26 on the rear wall of the cover 22 to abut against the middle portion of the alteration member 42, restricting the rearward movement of the guide 26 (see reference). Figure 8 (A) and (B)). Therefore, the guide 26 is positioned at the front, which reduces the distance between the guide 26 and the engaging teeth 20A at the rear of the rotating member 20, thereby increasing the engagement amount (insertion amount, overlap amount) of the engaging teeth 20A with the moving member 32. As a result, the torque in the rotating member 20 and the belt shaft 14 generated by the movement of the moving member 32 in the winding direction A increases, and the winding force of the webbing 16 winding towards the belt shaft 14 increases (becoming high power), thereby enabling the webbing 16 to properly restrain large occupants.

[0067] When the seat sensor detects a collision involving a small-sized occupant (when a collision is detected), at the alteration mechanism 34, the alteration MGG38 operates, instantaneously supplying high-pressure gas to the alteration cylinder 36. Within the alteration cylinder 36, the piston 40 moves upward due to the gas pressure. The piston 40's contact with the right end face of the alteration member 42 causes the alteration member 42 to move to the left (see reference). Figure 9 (A) and (B)). Therefore, the middle part of the changing member 42 moves to the left of the pair of moving plates 26B of the guide 26, and the right part of the changing member 42 is inserted between the pair of moving plates 26B by the moving member 32, causing the guide 26 to move rearward. The guide 26 is positioned in a rearward position, thereby increasing the distance between the guide 26 and the engaging teeth 20A at the rear of the rotating member 20, and decreasing the engagement amount (insertion amount, overlap amount) of the engaging teeth 20A with the moving member 32. As a result, the torque in the rotating member 20 and the belt shaft 14 generated by the movement of the moving member 32 in the winding direction A decreases, and the winding force of the webbing 16 winding towards the belt shaft 14 decreases (power reduction), thereby enabling the restraint force of the webbing 16 on small-sized occupants to become appropriate.

[0068] Here, this embodiment can also achieve the same function and effect as the first embodiment described above.

[0069] In particular, for the changing mechanism 34, the pair of movable plates 26B of the guide 26 abut against the middle portion of the changing member 42. The guide 26 is positioned at the front. The changing member 42 moves to the left, thereby moving the middle portion of the changing member 42 to the left of the pair of movable plates 26B, and inserting the right portion of the changing member 42 between the pair of movable plates 26B. The guide 26 then moves to the rear. Therefore, the movement path 24 of the movable member 32 can be changed through a simple structure, enabling the changing mechanism 34 to be miniaturized.

[0070] Alternatively, in the first and second embodiments described above, the MGG38 may be activated after the MGG30 has been activated. This allows the winding force of the webbing 16 toward the belt shaft 14 to be changed from a larger state to a smaller state.

[0071] [Third Implementation]

[0072] Figure 10 In the figure, a perspective view taken from a left rear oblique position shows the webbing winding device 60 according to the third embodiment of the present invention. Figure 11 In the middle, the webbing winding device 60 is shown in a rear view viewed from the rear.

[0073] The webbing winding device 60 involved in this embodiment has almost the same structure as the first embodiment described above, but differs in the following aspects.

[0074] like Figure 10 and Figure 11 As shown, in the pre-tensioning mechanism 18 of the webbing winding device 60 according to this embodiment, the changing mechanism 34 is arranged on the left side of the frame 12 and the lower side of the cover plate 22.

[0075] A guide 26 is fixed in the recess 22A of the cover plate 22, and the guide 26 is disposed at the front side position of the first embodiment described above (see reference). Figure 12 A rectangular alteration section 22B is formed through the lower wall of the cover plate 22, and the alteration section 22B is disposed on the lower side of the guide member 26.

[0076] A long, strip-shaped bifurcated plate 22C, serving as a branch, is disposed from the front to the top within the cover plate 22. The bifurcated plate 22C is integral with the bottom wall of the cover plate 22 and extends along the upper wall from the front wall of the cover plate 22. The upper end of the bifurcated plate 22C extends upward and is integral with the upper wall of the cover plate 22. Therefore, the movement path 24 from the front to the top within the cover plate 22 branches into an outer path 24A, which is on the outer periphery of the bifurcated plate 22C of the cover plate 22, and an inner path 24B, which is on the inner periphery of the bifurcated plate 22C of the cover plate 22. Furthermore, the bending angle of the bifurcated plate 22C (inner path 24B) between the front and top within the cover plate 22 is set to be relatively large (for example, approximately 90°).

[0077] Regarding the changing mechanism 34, the upper inner side of the changing cylinder 36 opens upwards, and the upper inner side of the changing cylinder 36 faces the changing part 22B of the cover plate 22. A generally cuboid changing member 42, serving as a path member, is fitted into the upper inner side of the changing cylinder 36, and a piston 40 inside the cylinder 28 is fixed to the lower surface of the changing member 42. The changing member 42 is positioned further outwards than the inner circumferential surface of the cover plate 22, and the upper surface of the changing member 42 is concave downwards in the front-rear direction.

[0078] However, when the seat sensors detect a collision involving a large occupant (when a collision is detected), the MGG38 in the alteration mechanism 34 does not operate, thereby altering the configuration of the component 42 to be positioned further outward than the inner circumferential surface of the cover plate 22 (see reference). Figure 12 Therefore, the moving member 32 moves along the side wall of the cover plate 22 from the lower part inside the cover plate 22 through the front to the upper part, without engaging with the engaging teeth 20A of the rotating member 20. As a result, the amount of engagement between the rotating member 20 (engaging teeth 20A) and the engaging teeth 20A of the moving member 32 in the rotational circumference direction is reduced, and the movement resistance generated by the engagement between the moving member 32 and the engaging teeth 20A is reduced. As a result, the torque in the rotating member 20 and the belt shaft 14 generated by the movement of the moving member 32 in the winding direction A is increased, and the winding force of the webbing 16 towards the belt shaft 14 is increased (becoming high power), thereby enabling the restraint force of the webbing 16 on large occupants to become appropriate.

[0079] When the seat sensor detects a collision involving a small-sized occupant (when a collision is detected), the MGG38 in the alteration mechanism 34 operates, and the MGG38 instantaneously supplies high-pressure gas to the alteration cylinder 36. Within the alteration cylinder 36, the piston 40 moves upward due to the gas pressure. The alteration component 42 moves upward integrally with the piston 40 (see reference). Figure 13Therefore, the changing member 42 protrudes into the lower part of the cover plate 22 via the changing part 22B of the cover plate 22. In the section from the lower part to the upper part of the cover plate 22, the moving member 32 moves along the upper surface of the changing member 42 and the inner side of the bifurcation plate 22C within the cover plate 22. In this section from the lower part to the front part of the cover plate 22, the moving member 32 engages with the engaging teeth 20A of the rotating member 20. This increases the amount of engagement between the rotating member 20 (engaging teeth 20A) and the engaging teeth 20A of the moving member 32 in the circumferential direction, thus increasing the resistance to movement. Consequently, the torque in the rotating member 20 and the belt shaft 14 generated by the movement of the moving member 32 in the winding direction A decreases, and the winding force of the webbing 16 towards the belt shaft 14 decreases (power reduction), thereby enabling the webbing 16 to properly restrain smaller occupants.

[0080] Here, with regard to the changing mechanism 34, the changing MGG38 is not activated, thereby the changing member 42 is positioned further outward than the inner circumferential surface of the cover plate 22. The movement path 24 of the moving member 32 within the cover plate 22, from the lower part through the front to the upper part, is located on the outer circumferential side of the cover plate 22 (including the outer path 24A). Meanwhile, the changing MGG38 is activated, thereby the changing member 42 protrudes downward into the cover plate 22, and the movement path 24 of the moving member 32 within the cover plate 22, from the lower part through the front to the upper part, is located on the inner circumferential side of the cover plate 22 (including the inner path 24B). Therefore, the movement path 24 of the moving member 32 within the cover plate 22, from the lower part through the front to the upper part, can be changed.

[0081] Furthermore, by changing the movement path 24 of the moving member 32 via the changing mechanism 34, the engagement amount of the rotating member 20 (engaging teeth 20A) with the moving member 32 in the circumferential direction is changed. Therefore, the torque generated by the movement of the moving member 32 on the rotating member 20 can be changed, and the winding force of the webbing 16 towards the belt shaft 14 can be changed (switched). Moreover, since only the movement path 24 of the moving member 32 is changed, no additional components or structures are required for the rotating member 20 and its bearings.

[0082] Furthermore, regarding the changing mechanism 34, the changing member 42 is positioned further outward than the inner circumferential surface of the cover plate 22. The changing member 42 moves upward, thereby protruding downward into the cover plate 22. Therefore, the movement path 24 of the moving member 32 can be changed through a simple structure, enabling miniaturization of the changing mechanism 34. Moreover, the changing member 42 can be moved simply by changing the MGG38. Therefore, the output of the changing MGG38 can be reduced, thus lowering its cost.

[0083] Furthermore, the movement path 24 of the moving member 32 within the cover plate 22, from the front to the top, is branched by the bifurcation plate 22C within the cover plate 22 into an outer path 24A on the outer periphery of the cover plate 22 and an inner path 24B on the inner periphery of the cover plate 22. Therefore, the movement path 24 of the moving member 32 within the cover plate 22, from the front to the top, can be appropriately altered.

[0084] Furthermore, the bending angle of the bifurcation plate 22C (inner path 24B) between the front and upper parts within the cover plate 22 is increased. Therefore, when the moving member 32 moves along the inner path 24B between the front and upper parts within the cover plate 22, the moving member 32 bends significantly due to the bifurcation plate 22C, thereby increasing the moving resistance of the moving member 32 caused by the bifurcation plate 22C. Consequently, the torque in the rotating member 20 and the belt shaft 14 generated by the movement of the moving member 32 towards the winding direction A is further reduced, and the winding force of the webbing 16 towards the belt shaft 14 is further reduced, thereby enabling the restraint force of the webbing 16 on small-sized occupants to become more appropriate.

Claims

1. A webbing winding device, characterized in that, have: A belt axle rotates in the winding direction to wind up the webbing worn by the occupant; A rotating component that rotates to cause the belt to rotate axially in the winding direction; A movable component that rotates the rotating component by moving and engaging with it. as well as The mechanism is changed, which alters the movement path of the moving component.

2. The webbing winding device according to claim 1, characterized in that, The changing mechanism alters the movement path of the moving member to change the engagement amount of the rotating member with the moving member in the rotational radial direction.

3. The webbing winding device according to claim 1, characterized in that, The changing mechanism alters the movement path of the moving member, thereby changing the engagement amount of the rotating member with the moving member in the rotational circumference.

4. The webbing winding device according to claim 1, characterized in that, have: A path component that forms the movement path of the moving component; as well as A changing component is disposed in the changing mechanism and supports the path component, and the path component is moved by means of movement.

5. The webbing winding device according to claim 4, characterized in that, The moving component moves to move the path component.

6. The webbing winding device according to claim 1, characterized in that, The movement path of the moving component is branched.

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