SEAT BELT WINDING DEVICE

Abstract

Belt winding device (10) comprising: a spool (14) that winds up a belt fitted by an occupant and that is rotated in an extension direction by pulling out the belt; a locking section (30) that limits rotation in the extension direction of the spool (14) in a vehicle emergency; an energy absorption element (50) that is arranged on an outer surface of the spool (14) as viewed radially and that, in a depressed state, permits rotation in the extension direction of the spool (14) at or above a force limiting load, when the locking section (30) has limited rotation in the extension direction of the spool (14);a winding section (48) provided on the radially viewed outer side of the coil (14) to which the energy absorption element (50) is anchored, and which winds up the energy absorption element (50) by rotating it through rotation of the coil (14) when the locking section (30) has limited the rotation of the coil (14);and a force limiting load generating mechanism provided on the radially viewed outer side of the coil (14) and comprising a pressure section (52) that presses the energy absorption element (50), wherein a presetting section (44) is provided on a radially viewed outer side of the winding section (48), wherein the presetting section (44) engages with the energy absorption element (50) along a radially viewed inner surface of the presetting section (44), wherein the presetting section (44) accommodates the energy absorption element (50), the winding section (48) and the pressure section (52), and wherein the presetting section (44) is fixed to a frame (12) that rotatably accommodates the coil (14).

Description

Technical field

[0001] The present invention relates to a belt winding device which enables a rotation of a spool in the direction of withdrawal at or above a force limiting load when a locking section has limited the rotation of the spool in the direction of withdrawal. Background of the state of the art

[0002] A belt winding device described in published national application JP 2003-502204 has a spool on which a belt is wound, a locking device that prevents rotation of the spool in the pull-out direction during sudden vehicle deceleration, and a torsion shaft arranged on an axially central section of the spool, comprising one section anchored to the locking device and another section anchored to the spool. In a state where the rotation of the torsion shaft is locked by the locking device, the spool rotates in the pull-out direction at or above a force-limiting load when the belt is pulled in the pull-out direction in such a way that the torsion shaft undergoes torsional deformation.

[0003] Furthermore, the torsion shaft described in the published Japanese national application JP 2003-502204 has a section with a small diameter and a section with a large diameter. The small-diameter section and the large-diameter section of the torsion shaft are arranged along a straight line in the axial direction of the coil. The force limiting load is set by selectively rotating the small-diameter section and the large-diameter section of the torsion shaft. SUMMARY OF THE INVENTION Technical Problem

[0004] However, a design in which the torsion shaft is located on an axially central section of the coil leaves room for improvement with regard to suppressing an increase in the size of the belt winding device along the axial direction (axial direction of the coil).

[0005] In view of the circumstances set out above, it is an object of the present invention to provide a belt winding device which can avoid an increase in size along the axial direction. Solution to the problem

[0006] A seatbelt rewinding device of a first aspect of the present invention comprises a spool, a locking section, an energy absorption element, a winding section, and a force-limiting load-generating mechanism. The spool winds up a seatbelt fitted by an occupant and is rotated in an extension direction by pulling out the seatbelt. The locking section limits the rotation in the extension direction of the spool in a vehicle emergency. The energy absorption element is arranged on an outer surface in the radial direction of the spool, and in a compressed (pressed) state, it allows rotation in the extension direction of the spool at or above a force-limiting load, provided the locking section has limited the rotation in the extension direction of the spool. The winding section is provided on the outer surface in the radial direction of the spool.The energy absorption element is anchored to the winding section, and the winding section receives the energy absorption element by rotating it due to the rotation of the coil when the locking section has limited the coil's rotation. The force limiter load-generating mechanism is provided on the radially viewed outer surface of the coil and has a pressing section that presses the energy absorption element.

[0007] A belt winding device of a second aspect of the present invention is the belt winding device of the first aspect, wherein a presetting section is provided on an outside of the winding section as viewed in a radial direction, wherein the presetting section engages with the energy absorption element along an inside of the presetting section as viewed in a radial direction.

[0008] A belt winding device of a third aspect of the present invention is the belt winding device of the first or second aspect, wherein a rotation limiting section, which limits the rotation of the spool relative to the locking section to a predetermined speed, is provided between the spool and the locking section. Furthermore, the winding section (winding section) is provided on an outer side of the rotation limiting section when viewed in a radial direction. Advantageous effects of the invention

[0009] In a seatbelt winding device of the first aspect of the present invention, the seatbelt, fitted by an occupant, is wound onto the spool. The occupant fits the seatbelt by pulling it out of the spool. The locking section limits the rotation of the spool in the pull-out direction in a vehicle emergency, and the winding section is rotated by the spool. When the seatbelt is pulled out and the winding section is rotated by the spool in this state, the energy-absorbing element is guided into the pushing section of the force-limiting load-generating mechanism, and then the energy-absorbing element is picked up by the winding section when it is pulled out by the pushing section.

[0010] In the present invention, the assembly is designed such that the force-limiting load is generated by the energy-absorbing element, which is provided on the radially outer surface of the spool. This element is received by the winding section, which is also located on the radially outer surface of the spool, and is pressed against the energy-absorbing element. In this way, the mechanisms that generate the force-limiting load (the energy-absorbing element, the winding section, and the force-limiting load-generating mechanism) are arranged along the radial direction. This avoids increasing the size of the force-limiting load-generating mechanisms along the axial direction. As a result, the size of the belt winding device does not increase along the axial direction.

[0011] In the belt winding device of the second aspect of the present invention, the energy absorption element is inserted in the presetting section by engaging along the radially oriented inner side of the presetting section. This design eliminates the need for a wall separating the portion of the energy absorption element located in the presetting section from the winding section. This further avoids increasing the size of the belt winding device along the axial direction. In designs that have a wall separating the portion of the energy absorption element located in the presetting section from the winding section, it is conceivable that the energy absorption element could be wound onto the wall (which would create an additional, undesirable winding load).However, the present invention makes it possible to avoid the occurrence of such an undesirable winding load.

[0012] In the belt winding device of the third aspect of the present invention, it is even better to avoid the increase in the size of the belt winding device along the axial direction than in cases where the mechanisms that generate the force limiting load (the energy absorption element, the winding section and the force limiting load generation section) are arranged offset with respect to the rotation limiter section in the axial direction of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Fig. Figure 1 shows a perspective exploded view of a belt winding device of an exemplary embodiment.

[0014] Fig. Figure 2 shows an enlarged cross-section along an axial direction of a coil.

[0015] Fig. Figure 3 shows a perspective exploded view of the force limiter load generation and adjustment mechanisms in a belt winding device.

[0016] Fig. Figure 4 shows a side view of force limiter load generation and adjustment mechanisms.

[0017] Fig. Figure 5 shows a side view of a cam pivoting mechanism.

[0018] Fig. Figure 6 shows an enlarged side view of a cam, lever, and the like when a seatbelt is fitted by a tall occupant.

[0019] Fig. Figure 7 shows an enlarged side view of a cam, lever, and the like when a seatbelt is fitted by a small-sized occupant.

[0020] Fig. Figure 8 shows a schematic side view of a state that results before an energy absorption wire is wound onto a winding section.

[0021] Fig. Figure 9 shows a schematic side view of a state in which a winding section has received (wound up) an energy absorption wire.

[0022] Fig. 10 shows a Fig. 8 corresponding side view, showing a guide wire provided with a limiting projection and the like.

[0023] Fig. 11 shows a Fig. 6 and Fig. 7 corresponding enlarged side view, showing a cam, a lever and the like according to a modified example. DESCRIPTION OF THE EXAMPLES OF EXECUTION

[0024] Below is a belt winding device according to an embodiment of the present invention with reference to the Fig. 1 to Fig. 9. It should be noted that in the drawings, the direction of arrow Z, the direction of arrow R, and the direction of arrow C each indicate an axial, a radial, and a circumferential direction of the coil, where appropriate. Furthermore, in the following description, unless specifically stated otherwise, a simple reference to the axial, radial, and circumferential directions refers to the axial, radial, and circumferential directions of the coil.

[0025] As this is in Fig. As shown in 1, it has a belt winding device. 10 according to one embodiment of the present invention, a frame 12 , a coil 14 , which winds up an unseen belt, and a torsion shaft 18 , which provide a first force limiting mechanism 16 forms (see also Fig. 2) The belt winding device10 It also has a pre-tensioning mechanism 20 , which the coil 14 in one winding direction, it rotates in a vehicle emergency, and a second force limiting mechanism 22 , which is equipped with a force limiter load generation mechanism and a force limiter load adjustment mechanism.

[0026] The frame 12 It is designed in a rectangular frame shape and has a plate-shaped back panel. 12A , which is fixed to a vehicle body. Footplates 12B , 12C extend essentially perpendicularly from both end sections of the back panel when viewed in the width direction. 12A outwards, and end sections of the footplates 12B , 12C on the back panel 12A Opposite sides are connected by a connecting plate 12D tied together.

[0027] The coil 14has a winding section 14A , which is essentially in a circular column shape and around which the belt (not shown) is wound. The winding section 14A is equipped with an insertion hole 14B formed, through which the belt is inserted. The insertion hole 14B It is formed in a rectangular shape, its longitudinal direction being axial when viewed from the radially opposite outer side. The belt is inserted through the hole. 14B inserted and a longitudinally viewed end section of the belt is attached to the spool 14 Anchored by attaching a stopper element to the longitudinally viewed end section of the belt. A rotation of the spool. 14 to the other side in the circumferential direction (in the direction opposite to the direction of arrow C) winds the belt onto the spool. 14 up, and pulling the belt out of the spool 14the coil rotates 14 to one side in the circumferential direction (the direction of arrow C), i.e. the coil 14 It rotates in an extension direction. Furthermore, an end section on the other side extends axially (in the direction opposite to the direction of arrow Z) from the coil. 14 with surgical teeth 14C equipped with which movement elements 38 of the preloading mechanism described below 20 are undergoing intervention.

[0028] As this is in Fig. Figure 2 shows an axial midsection of the coil 14 with a torsion shaft insertion hole 14D formed, into which the torsional wave described below is formed 18 It is inserted. A closed end face of the torsion shaft insertion hole. 14D(other side in axial direction) is formed with a first engagement section (not shown) with which the other axial direction side end section (the end section on the other side) in the axial direction) of the torsional shaft 18 is engaged. The other axial direction end section of the torsional shaft 18 and the coil 14 are connected in such a way that they can rotate together as a unit through the engagement of the other axial direction side end section of the torsion shaft. 18 with the first intervention phase.

[0029] The axial center section of the coil 14 and the one axial direction side end section (the end section on one side in the axial direction) of the coil 14 are equipped with a rotation limiting nut mounting hole 14E trained in which a rotation limiting nut 26 forming part of a rotation limiting mechanism 24is housed. Viewed from one axial direction side, an inner edge of the rotation limiting nut mounting hole is visible. 14E formed with a hexagonal profile that resembles the outer edge of the rotation limiting nut 26 corresponds. The rotation limiting nut 26 is in the rotation limit nut mounting hole 14E introduced and is therefore able to function as a unit together with the coil 14 to turn. The depth of the rotation limit nut mounting hole. 14E from one side to the other in the axial direction of the coil 14 is set so that it is deeper than the thickness of the rotation limiting nut 26 Accordingly, the rotation limiting nut 26 able to move along the axial direction within the rotation limit nut mounting hole 14E to move.

[0030] As this is in Fig. As shown in Figure 1, one axial direction side end section of the coil is shown. 14 with a storage hole 14F trained. In the shelter hole 14F is an unseen pressure element and an intervention strip 28 accommodated, which is equipped with a winding section (winding section) described below 48 is undergoing an intervention. The intervention strip 28 is through the coil 14 supported in such a way that it is able to tilt into a state where it is inside the sheltering hole 14F is arranged, and the intervention strip 28 is forced in a direction by the pushing element in which a protrusion from the housing hole occurs. 14F would be caused. In an assembled state of the belt winding device 10 is the entire intervention strip 28 in a state where he is inside the shelter hole 14Fis housed, and the tilting of the intervention strip 28 is limited by a tilt limiting element not shown. When the coil 14 begins to relate to a locking base described below. 30 To rotate, the tilt limit of the intervention strip will be reached. 28 released by the tilt limiting element, and the engagement strip 28 protrudes from the shelter hole 14F out. If the intervention strip 28 from the shelter hole 14F protrudes, the intervention strip 28 with the wrapping section 48 in engagement, which allows the coil to 14 and the diapering section 48 rotate together as a single unit.

[0031] The one axial direction side (the side in the axial direction) of the coil 14 is with the locking base 30 and a locking gear 32It is provided with a part that forms a locking section of a locking mechanism. The locking base 30 is formed in an essentially circular plate shape, the thickness direction of which is in the axial direction, and the locking base 30 is with first surgical teeth 30A trained, which engage with pawl teeth not shown, which are attached to the footplate 12C are provided for in the frame. The locking gear 32 is at the locking base 30 so that it can tilt, and the locking gear 32 is with second surgical teeth 32A designed to engage with the aforementioned pawl teeth. In a vehicle emergency, the rotation of the locking base 30 through the intervention of the first teeth 30A the locking base 30 and the second intervention teeth 32A of the locking gear 32with the pawl teeth not shown, which are attached to the base plate 12C of the frame 12 are intended to be limited.

[0032] As this is in Fig. Figure 2 shows the other axial direction side of the locking base. 30 with a cylindrical section 30B provided, which is attached in one piece to the locking base 30 is formed and which is another part of the rotation limiting mechanism 24 forms. The cylindrical section 30B is formed in an essentially circular cylindrical shape, and an outer circumferential section of the cylindrical section 30B is equipped with an external thread section 30C trained, who is equipped with the rotation limiting nut 26 It is screwed together.

[0033] An axial midsection of the locking base 30 is designed with a second engagement section (not shown) with which an axial direction end section of the torsional shaft18 , which is described below, is in engagement. One axial direction side end section of the torsional shaft 18 and the locking base 30 are connected to each other in such a way that they can rotate together as a unit through the engagement of one axial direction side end section of the torsion shaft and the second engagement section.

[0034] The torsional wave 18 is designed in such a way that it is essentially rod-shaped, with end sections on one side and the other side of the torsion shaft 18 In the axial direction, each is provided with a second engagement section and a first engagement section, which are not shown, each with the second engagement section that is attached to the locking base. 30 is provided for, and the first engagement section, which is attached to the coil 14 is intended to be in intervention. A location of the torsional wave. 18The section between the second engagement section and the first engagement section has a smaller diameter than the second engagement section and the first engagement section and forms a torsion section. 18A , which has a substantially uniform circular cross-section along the axial direction. In a state where the rotation is in the withdrawal direction of the coil 14 with regard to the locking base 30 through the torsional wave 18 The torsion section twists when a load acting on an occupant from the belt exceeds a predetermined value. 18A the torsional wave 18 , causing a rotation in the direction the coil is pulled out 14 with regard to the locking base 30 is made possible.

[0035] As this is in Fig. As shown in 1, this is the preload mechanism. 20 constructed so that it is a cylinder 36 , which has a case34 connected to a multitude of movement elements 38 , which are inside the cylinder 36 are arranged, a piston ball 40 , which are the movement elements 38 presses, and a gas generator 42 has, which is located at an end section of the cylinder 36 is arranged. The cylinder 36 It is designed so that a steel tube is bent into a predetermined shape. The many moving parts 38 , each of which is formed in an essentially circular column-like shape, are in the cylinder 36 introduced. The spherically shaped piston ball (ball shape) 40 is in the cylinder 36 on the side of the moving element 38 of the gas generator 42 introduced. The piston ball 40 pushes the movement elements 38 as a result of an increase in pressure inside the cylinder 36, which is caused by a high gas pressure generated by activating the gas generator 42 is generated. Accordingly, the many movement elements move. 38 inside the cylinder 36 before a procedure with the surgical teeth 14C , which are attached to the coil 14 are planned, and press the intervention teeth. 14C The coil 14 This causes it to rotate in the winding direction.

[0036] As this is in Fig. As shown in Figure 3, the second force limiting mechanism has 22 a case 44 , which is on the footplate 12C of the frame 12 is fixed (see Fig. 1) and serves as a presetting section, and a cover sheet 46 , which is located at one axial direction side end section of the housing 44 is appropriate. The second force limiting mechanism 22 has the wrapping section 48 , which is between the casing 44and the cover sheet 46 is arranged to form an energy-absorbing wire 50 , which serves as an energy absorbing element, a guide wire 52 , which serves as a press section or push section (first push section), a lever 54 , which serves as a press section or pressure section (second pressure section), and a cam 56 , which serves as a sliding element.

[0037] The case 44 It is designed in a box shape and is open on one axial direction side. The housing 44 has a floor wall 44A , which extends so that it reaches the base plate 12C of the frame 12 is turned towards (see Fig. 1), and a side wall 44B , which are formed by an outer circumferential section of the floor wall 44A is curved in such a way that it extends towards one axial direction. The bottom wall 44A is equipped with an insertion hole 44Cformed by which one axial direction side end section of the coil 14 (see Fig. 1) is introduced. The wrapping section 48 , which is described below, is rotatably supported by an engagement with a shoulder section 44D , which is located on an inner circumferential edge section of the insertion hole 44C is formed. A wire guide fastening section. 44E is on an outer side of the floor wall when viewed in a radial direction 44A provided for, which has the insertion hole 44C is trained, and the guide wire described below 52 is on the guide wire attachment section 44E fastened. The guide wire fastening section 44E is equipped with circular support holes 44F formed. An inner surface of the side wall when viewed radially. 44B is arranged so that it corresponds to the winding section described below 48along the radial direction. A section of the inner surface of the side wall, viewed radially. 44B forms a presetting surface 44G , which is designed with a circular tube surface profile. Furthermore, in the present embodiment, the structure is designed such that there is no wall obstructing the presetting surface. 44G from the wrapping section 48 separates. A place of the side wall 44B , which is the wire guide mounting section 44E the floor wall 44A corresponds to a recessed lever support section 44H trained to use the lever described below 54 tiltable supports. In addition, there is a location on the side wall. 44B , which is the wire guide mounting section 44E the floor wall 44A corresponds to, and a location adjacent to the recessed lever support section 44H with a recessed cam arrangement section 44Iformed in which the cam described below 56 is arranged. It should be noted that a location of the floor wall 44A , which belongs to the cam arrangement section 44I corresponds to a shaft support hole (not shown) that forms the other axial direction side end section of the cam. 56 , which is described below.

[0038] The cover sheet 46 is located on an axial direction side end section of the side wall 44B of the case 44 attached. The cover sheet 46 is equipped with an insertion hole 46A forms the insertion hole 44C corresponds to that in the floor wall 44A of the case 44 is trained. In addition, there is a place for the cover sheet. 46 , which is the wire guide mounting section 44E of the case 44 facing the axial direction, with circular support holes 46Btrained. A place for the cover sheet. 46 , which is connected to the cam arrangement section 44I of the case 44 It is aligned and has an insertion hole. 46C formed by a wave described below 56A of the cam 56 has been introduced.

[0039] As this is shown in the Fig. 2 and Fig. As shown in section 3, this is the wrapping section. 48 Formed in a tubular shape. The winding section 48 is coaxial to the coil 14 and on an outer side, viewed in a radial direction, of one axial direction side end section of the coil 14 arranged. An inner circumferential section of the winding section. 48 is equipped with a large number of intervention teeth along the circumferential direction 48A trained, with which the intervention strip described above 28is engaged. Furthermore, another axial-direction side-end section of an outer circumferential section of the winding section. 48 with a flange 48B formed, which projects outwards towards the outer side when viewed radially. A location of an outer circumferential surface of the winding section. 48 , which extends further towards one axial direction side than the flange 48B It is located, forming a receiving surface (winding surface) 48C , at which the energy-absorbing wire described below 50 wound up, i.e., recorded.

[0040] The energy-absorbing wire 50 It is formed by winding a linear element (wire-shaped element) made from a steel material or the like. More precisely, the energy-absorbing wire has 50 a ring-shaped section 50A, which is formed by winding the linear element in a circumferential direction in such a way that a ring shape is formed that runs along the axial direction. The outer diameter of the ring-shaped section 50A is in a natural state, i.e., before it reaches the presetting surface described below. 44G of the case 44 is set in such a way that it has a larger outer diameter than the inner diameter of the presetting surface. 44G is. In a state with a reduced diameter of the annular section 50A is the ring-shaped section 50A on the inside of the presetting surface when viewed in the radial direction 44G arranged, and an outer surface of the annular section viewed in a radial direction 50A is located on an inner surface of the presetting surface when viewed in a radial direction. 44G on, whereby the energy-absorbing wire 50on the case 44 is attached (fastened). An axial direction side end section 50B of the energy-absorbing wire 50 forms part of the ring-shaped section 50A As this is shown in Fig. As shown in section 4, another axial direction side end section is shown. 50C of the energy-absorbing wire 50 to one axial direction side of the ring-shaped section 50A through the inner side of the annular section when viewed in a radial direction 50A offset. The other axial direction side end section 50C of the energy-absorbing wire 50 is located at one axial direction side end section of the winding section 48 anchored. Accordingly, as is the case in Fig. 8 is shown, a place 50D , on which the energy-absorbing wire 50 at the wrapping section 48 is anchored, and a place 50E , which is between the guide wire 52and the lever described below 54 clamped in relation to each other in the axial direction of the winding section 48 arranged in a staggered pattern.

[0041] As this is shown in the Fig. 3 and Fig. As shown in section 4, this is the guide wire. 52 designed so that it uses a material with lower strength than the energy-absorbing wire 50 applies. The wire guide 52 It is formed in a crescent shape (sickle shape) with an outer surface viewed radially and an inner surface viewed radially, which curve gently when viewed along the axial direction. The wire guide 52 It is formed in a block shape and has a predetermined thickness in the axial direction. Furthermore, it has one axial direction side and one axial direction side of the wire guide. 52 each with circular column-shaped support columns 52A ,52B provided, which fit into the support holes 44F , which are in the case 44 are formed, and the support holes 46B are introduced, which are in the cover sheet 46 are formed. An inner surface of the wire guide when viewed radially. 52 is formed by an adjustment surface 52C , which are located on the ring-shaped section 50A of the energy-absorbing wire 50 is attached to the housing 44 is attached. The adjustment surface (insertion surface) 52C is arranged in such a way that it forms an extension of the presetting area 44G in a state where the wire guidance 52 on the wire guide mounting section 44E of the case 44 It is attached. It should be noted that the curvature of the adjustment surface 52C and the curvature of the presetting surface 44Gare defined in such a way that they have essentially the same curvature relative to each other. Furthermore, an outer surface of the wire guide, viewed in the radial direction, forms 52 a guide surface 52D , which is a location on the energy-absorbing wire 50 between the other axial direction side end section 50C and leads to a place that is separated from the ring-shaped section 50A is offset away. In addition, there is an intermediate section of the guide surface viewed in the circumferential direction. 52D with a depth 52E trained. The guide surface 52D It is therefore designed with a large number of curved sections.

[0042] The lever 54 is formed in a block shape and has a wave 54A , which are located in the lever support section 44H is arranged in the case 44 is trained to have an arm 54B , who separated himself from the wave 54Ato the side of the wire guide 52 extends, and a movement section 54C , which is located at one leading end of the arm 54B is planned. More precisely, the wave 54A in a circular column shape corresponding to the shape of an inner circumferential surface of the lever support section 44H trained. The wave 54A is in the lever support section 44H arranged so that the arm 54B tilts (is angled). The tilting of the arm 54B moves the movement section 54C , which is at the leading end of the arm 54B is intended to be in one direction towards the wire guide 52 Towards or away from it. The movement section 54C is arranged in such a way that it forms the depression 52E is facing the guide surface 52D the wire guide 52 is trained. The movement of the movement segment. 54C to the side of the wire guide 52clamps the energy-absorbing wire 50 between the movement section 54C and the wire guide 52 , and deforms the energy-absorbing wire 50 to a shape that forms the guide surface 52D the wire guide 52 corresponds.

[0043] The cam 56 has a wave 56A , which is formed in an essentially circular column-like shape, and a cam body 56B , which is on the other axial side of the shaft 56A is intended and rotates in such a way that it completes the movement section 54C of the lever 54 expresses. As this in Fig. As shown in section 4, this is the cam body. 56B formed in a cut-out, circular column-like shape, such that an outer circumferential section of the cam body 56B with a section 56C with a large diameter, a section 56Dwith a small diameter, which is defined with a smaller radius of curvature than the large diameter section, and a connecting section 56E is provided with the section 56C with large diameter and the section 56D connects them with a small diameter. In a state where the section 56C with a large diameter cam body 56B and the movement section 54C of the lever 54 the movement section is located next to each other 54C of the lever 54 near the guide surface 52D the wire guide 52 arranged. In a state where the section 56D with a small diameter cam body 56B and the movement section 54C of the lever 54 the movement section is located next to each other 54C of the lever 54 from the guide surface 52D the wire guide 52arranged away.

[0044] As this is in Fig. As shown in 5, the cam 56 at a reduced speed via a cam rotation mechanism 58 rotated. More precisely, the cam rotation mechanism is 58 so that it is a primary gear 60 , which is located at one axial direction end section of the torsional shaft 18 is arranged in such a way that it functions as a single unit together with the coil 14 can rotate, a final gear 62 , which is located at one axial direction side end section of the cam 56 is attached, and a first intermediate gear 64 and second intermediate gear 66 has a rotation of the primary gear 60 to the end gear 62 transferred. When a predetermined length of the belt is reached, starting from a fully wound state on the spool. 14 has been pulled out, the section lies 56Dwith a small diameter cam body 56B and the movement section 54C of the lever 54 adjacent to each other. Accordingly, the movement section 54C of the lever 54 from the guide surface 52D the wire guide 52 Arranged away (distant). If more than the predetermined length of the belt is from the spool. 14 When pulled out, the connecting section lies 56E of the cam body 56B and the movement section 54C of the lever 54 next to each other, with the section following 56C with a large diameter cam body 56B and the movement section 54C of the lever 54 lie against each other. The movement section 54C of the lever 54 This results in proximity to the guide surface 52D the wire guide 52arranged. It should be noted that in the present embodiment, the setting is designed such that if the belt is fastened by a small occupant, the belt is pulled away from the spool. 14 the extended belt does not exceed the predetermined length, and if the belt is fastened by a large occupant who is pulled off the reel 14 The extended belt exceeds the predetermined length. It should be noted that a small occupant is one with the same physical size as a dummy AF05, and a large occupant is one with the same physical size as a dummy AM50. Furthermore, in the present embodiment, the primary gear 60 , the end gear 62 , the first intermediate gear 64 and the second intermediate gear 66 , which the cam rotation mechanism 58 form, inside a gear housing recess68A arranged in a gearbox housing 68 is formed, which is attached to the footplate 12C of the frame 12 is arranged. The gear housing recess 68A is through a gear cover or transmission cover 70 sealed. Operation and advantageous effects of the present embodiment

[0045] The operation and advantageous effects of the present embodiment are explained below.

[0046] As this is in Fig. As shown in Figure 1, in the present embodiment the belt (not shown) is placed over the body of an occupant of the vehicle by pulling the belt from the spool. 14 is pulled out.

[0047] Furthermore, in a state where the belt has been placed over the body of the vehicle occupant, a vehicle collision will cause the locking mechanism to be actuated, resulting in a rotation in the pull-out direction of the locking base. 30 This prevents rotation in the direction the coil is being pulled out. As a result, a rotation in the withdrawal direction of the coil is prevented. 14 , which is connected to the locking base 30 via the torsional wave 18 is coupled, limiting the pulling of the belt from the spool. 14 The occupant's body attempts to move towards the front of the vehicle and is thus restrained by the seatbelt.

[0048] Furthermore, it moves when the gas generator 42 The piston ball is activated in a vehicle collision. 40 the many movement elements 38 The movement elements 38 , those that have moved, are standing with those on the coil 14planned surgical teeth 14C in intervention and press the intervention teeth 14C , which causes the coil 14 The reel is rotated in the winding direction. This ensures a predetermined length of belt is applied to the spool. 14 wound up, thus eliminating any sagging of the belt worn by the occupant and increasing the restraining force on the occupant provided by the belt.

[0049] Furthermore, it should be in a state where the rotation is in the direction of withdrawal of the locking base. 30 is limited, the occupant's body pulls on the belt with an even greater force, resulting in a rotational force in the pull-out direction at the coil. 14 As a result of this tensile force, a torsional resistance load (deformation resistance load) of the torsional section acts. 18A the torsional wave 18 (see Fig. 2) If the torsion section exceeds the limit, it twists (deforms). 18AThis means the first force limiting mechanism 18 is activated. The rotation in the direction the coil is pulled out. 14 This results in a load at or above the force limiter load (torsional resistance load of the torsion section). 18A ) is permitted. Accordingly, rotation in the direction of the coil's withdrawal is allowed. 14 as a result of the twisting of the torsion section 18A This allows the belt to be pulled out of the spool. 14 This reduces the load (stress) exerted on the occupant's chest by the seatbelt. Furthermore, the kinetic energy of the occupant pulling on the belt is absorbed to an extent that is sufficient to counteract the twisting of the torsion section. 18A corresponds.

[0050] Furthermore, in the present embodiment, when the coil moves 14 with a turn together with the rotation limiting nut 26 (see Fig. 2) in the direction of withdrawal in relation to the locking base 30 begins, the rotation limiting nut 26 along the cylindrical section 30B to one axial direction side. Furthermore, if the coil 14 and the rotation limiting nut 26 a predetermined number of rotations in relation to the locking base 30 have completed an end surface of one axial direction side of the rotation limiting nut 26 at the locking base 30 on. The number of revolutions of the coil 14 with regard to the locking base 30 This limits it to a predetermined number of revolutions.

[0051] It should be noted that, as is stated in the Fig. 4 and Fig. 6 is shown in a state where the belt is fastened by a larger occupant and consequently the section 56C with a large diameter cam body 56Band the movement section 54C of the lever 54 lie against each other, the movement section 54C of the lever 54 near the guide surface 52D the wire guide 52 is arranged accordingly. The energy-absorbing wire is 50 between the movement section 54C and the wire guide 52 clamped and deformed into an essentially wavy shape, which forms the guide surface 52D the wire guide 52 corresponds.

[0052] Furthermore, if the coil 14 in the direction of withdrawal in relation to the locking base 30 begins to rotate, i.e., when the torsional shaft 18 begins to twist, which is in Fig. 1 shown intervention strip 28 from the housing hole (mounting hole) 14F the coil 14 It comes out and reaches with the intervention teeth. 48A of the wrapping section48 in action. The coil 14 and the diapering section 48 They therefore rotate together as a single unit. Furthermore, when the winding section... 48 rotates, the energy-absorbing wire 50 between the movement section 54C and the wire guide 52 pulled through and is applied to the winding section 48 wound up while he was between the movement section 54C and the wire guide 52 is deformed (by being pulled through three tensile sections T). Accordingly, a rotation occurs in the direction the coil is pulled out. 14 at or above the force limiting load (the sum of the torsional resistance load of the torsional section) 18A the torsional wave 18 and the tensile load of the energy-absorbing wire 50 ) permitted.

[0053] Accordingly, the load (stress) exerted on the occupant's chest by the belt is reduced by the torsion section 18A the torsional wave 18 a torsion occurs and by the energy-absorbing wire 50 between the movement section 54C and the wire guide 52 is pulled out while it is deformed, and the kinetic energy of the occupant pulling on the belt is absorbed in an amount equal to the torsional deformation of the torsion section. 18A the torsional wave 18 and the deformation of the energy-absorbing wire 50 corresponds.

[0054] On the other hand, as this is shown in Fig. 7 is shown in a state where the belt is fastened by the occupant of a small size and consequently the section 56D with a small diameter cam body 56B and the movement section 54C of the lever 54lie against each other, the movement section 54C of the lever 54 from the guide surface 52D the wire guide 52 The movement segment is arranged at a distance (spaced apart). Accordingly, a state is achieved in which there is a separation between the movement segments. 54C and the wire guide 52 the energy-absorbing wire 50 is not deformed or only undergoes very slight deformation. If the coil 14 in the direction of withdrawal together with the winding section 48 As it rotates, the energy-absorbing wire becomes 50 accordingly at the winding section 48 wound up without between the movement section 54C and the wire guide 52 to be deformed (or only very slightly deformed). Accordingly, a rotation in the withdrawal direction of the coil is required. 14 at or above the force limiting load (the torsional resistance load of the torsional section) 18A the torsional wave18 ) permitted.

[0055] As described above, in the present embodiment, when the seat belt is fastened by a tall occupant, the force limiter load is high. Conversely, when the seat belt is fastened by a short occupant, the force limiter load is low. This thus provides appropriate protection according to the occupant's size.

[0056] It should be noted that with the second force limiting mechanism 22 In the present embodiment, a deformation amount of the energy-absorbing wire 50 (Pressure force acting on the energy-absorbing wire 50 (acts) according to a remaining winding quantity (winding amount) of the belt on the spool 14The belt tension is adjusted according to the size of the occupant wearing the belt. This allows the force limiter to be set without the need for a body weight sensor or similar device to determine the occupant's size. This refers to the belt retractor. 10 The present embodiment allows the force limiter load to be set while avoiding an increase in the number of components.

[0057] Furthermore, the second force limiting mechanism 22 of the present embodiment, the rotation of the coil 14 to the cam 56 transferred to the cam 56 to rotate, thereby increasing the amount of deformation of the energy-absorbing wire 50 is adjusted. This allows the force limiting mechanism to be activated. 22The generated force limiter load is set without providing an electric actuator that controls the movement section. 54C of the lever 54 and the guide surface 52D the wire guide 52 moved towards each other or away from each other.

[0058] Furthermore, as is shown in Fig. As shown in the present embodiment, the location is shown in section 8. 50D , on which the energy-absorbing wire 50 at the wrapping section 48 is anchored, and the place 50E , on which the energy-absorbing wire 50 between the wire guide 52 and the lever 54 clamped in the axial direction of the winding section 48 arranged in an offset pattern. Accordingly, when the winding section 48 together with the coil 14 turns, as this in Fig. As shown in 9, the energy-absorbing wire 50 the one between the wire guide 52 and the lever54 is pulled through at the winding section 48 wound in a spiral shape with a space between the energy-absorbing wire 50 and the flange 48B This is made possible by the fact that the energy-absorbing wire 50 without any overlap in the radial direction, even in an area where the winding section 48 and the coil 14 have turned more than one full revolution.

[0059] Furthermore, in the present embodiment, if a voltage exists between the location 50D , on which the energy-absorbing wire 50 at the wrapping section 48 is anchored, and the place 50E occurs where the energy-absorbing wire 50 between the wire guide 52 and the lever 54 clamped, a section of the wire guide 52 , which is attached to the energy-absorbing wire 50it is bent into a concave shape according to the shape of the energy-absorbing wire. 50 That is, the energy-absorbing wire 50 assumes a state that falls within the section of the wire guide 52 It fits, which is deformed into a concave shape. This allows the position in the axial direction of the winding section to be adjusted. 48 from the location of the energy-absorbing wire 50 between the wire guide 52 and the lever 54 The clamped position will be maintained. It should be noted that, as in Fig. 10 shown by providing a limiting projection 52F on the wire guide 52 as a limiting section to maintain the position in the axial direction of the winding section 48 from the location of the energy-absorbing wire 50 between the wire guide 52 and the lever 54clamping enables the realization of a structure in such a way that the position of the location where the energy-absorbing wire is located 50 between the wire guide 52 and the lever 54 clamped in the axial direction of the winding section 48 remains in place. Furthermore, in cases where the limiting advantage 52F It is planned that a section of the wire guide 52 on which the energy-absorbing wire 50 It should also be configured so that it deforms into a concave shape according to the shape of the energy-absorbing wire. 50 Furthermore, a limiting projection, which is considered a limiting section according to the limiting projection, can 52F also serves on the side of the lever 54 be planned.

[0060] Furthermore, as in Fig. 4 shown in the present embodiment is the other axial direction side end section. 50C of the energy-absorbing wire 50 to the other axial direction side of the ring-shaped section 50A through the inner side of the annular section when viewed in a radial direction 50A offset, and the other axial direction side end section 50C of the energy-absorbing wire 50 is at the other axial direction side end section of the winding section 48 anchored. Accordingly, due to the design of the ring-shaped section. 50A of the energy-absorbing wire 50 prevents the place 50E , on which the energy-absorbing wire 50 between the wire guide 52 and the lever 54 When clamped, it moves towards one axial direction. This prevents movement where the position 50E , on which the energy-absorbing wire 50between the wire guide 52 and the lever 54 is clamped and moves towards one axial direction side.

[0061] Furthermore, in the present embodiment, the energy-absorbing wire 50 , the presetting area 44G of the case 44 , the wrapping section 48 and the like, which constitute the second force limiting mechanism 22 The components are arranged along the radial direction, thus preventing the size of the mechanism generating the force-limiting load from increasing along the axial direction. As a result, the belt winding device can be prevented from 10 the size increases along the axial direction. Furthermore, in the present embodiment, it allows for the inclusion of the second force limiting mechanism. 22 , that the force limiter load caused by the torsional shaft 18is generated, which is located on the axially central section of the coil 14 The intended setting is lower. This allows for a reduction in the size of the torsion shaft. 18 (a smaller diameter and a shorter axis).

[0062] Furthermore, in the present embodiment, the respective assembly components that constitute the second force limiting mechanism are 22 form, such as the energy-absorbing wire 50 , the case 44 and the winding section 48 , on the radially viewed outer side of the rotation limiting mechanism 24 arranged. This prevents the belt winding device from 10 in size along the axial direction compared to cases where the respective components that form the second force limiting mechanism 22form, in the axial direction with respect to the rotation limiting mechanism 24 are arranged in a staggered pattern.

[0063] Furthermore, in the present embodiment, the outer surface of the ring-shaped section, viewed in the radial direction, is located 50A of the energy-absorbing wire 50 on the inner surface of the presetting surface, viewed in the radial direction 44G on, whereby the energy-absorbing wire 50 on the case 44 is attached. This design eliminates the need for a wall that separates the ring-shaped section. 50A of the energy-absorbing wire 50 from the winding section 48 separates. This allows for an increase in the size of the belt winding device. 10 in the axial direction is avoided even better. This applies to construction types that have a wall which defines the annular section. 50A of the energy-absorbing wire 50from the winding section 48 separating, it is conceivable that a section which is separated from the ring-shaped section 50A of the energy-absorbing wire 50 when pulled out, it can be wound up on the wall. However, the present embodiment makes it possible to avoid the occurrence of such an undesirable winding load.

[0064] Furthermore, in the present example, the setup is designed such that the energy-absorbing wire 50 , which is the second force limiting mechanism 22 forms, not together with the coil 14 rotates. This allows for a pleasant (slight) sensation when the belt comes off the spool. 14 is pulled out, and also allows the belt to run smoothly on the spool. 14 is wound up.

[0065] It should be noted that the present embodiment describes an example in which the cam body 56B of the cam 56 with the section 56C with large diameter and the section 56D is provided with a small diameter to reduce the deformation amount of the energy-absorbing wire 50 to adjust. However, the present invention is not limited to this. For example, as is shown in Fig. Figure 11 shows the radius of curvature of an outer circumferential surface of the cam body. 56B be set in such a way that it progresses along the circumferential direction of the cam body. 56B gradually increases. Such a design allows the amount of deformation of the energy-absorbing wire to decrease. 50 increases in a stepless manner as the remaining capacity of the belt on the spool increases. 14 decreases. Furthermore, the amount of deformation of the energy-absorbing wire can 50increase in a multitude of stages formed by more than three stages, by the outer circumferential surface of the cam body 56 is provided with locations that have radii of curvature between those of the section 56C with a large diameter and the section 56D have a small diameter.

[0066] Furthermore, the present embodiment illustrates an example in which the amount of deformation of the energy-absorbing wire 50 is set by adjusting the movement section 54C of the cam 56 to the side of the wire guide 52 is moved. However, the invention is not limited to this. For example, the amount of deformation of the energy-absorbing wire can be 50 can be adjusted by changing the wire guide 52 to the side of the cam 56 is moved, or the amount of deformation of the energy-absorbing wire 50can be adjusted by changing both the wire guide 52 as well as the cam 56 to be moved.

[0067] Furthermore, in the present embodiment an example has been explained in which the belt winding device 10 the first force limiting mechanism 16 and the second force limiting mechanism 22 However, the present invention is not limited thereto. For example, a belt winding device may be provided with only one force limiting mechanism, similar to the second force limiting mechanism. 22 is.

[0068] An embodiment of the present invention has been explained above. However, the present invention is not limited to this embodiment, and various other modifications can obviously be carried out within a scope that does not deviate from the scope of the present invention.

[0069] The disclosure of the Japanese patent application filed on April 24, 2015, JP 2015-089195, is incorporated herein by reference in its entirety.

Claims

[1] Belt winding device with: a spool that winds up a belt fitted by an occupant and is rotated in an extraction direction by pulling out the belt; a locking section that limits rotation in the withdrawal direction of the coil in a vehicle emergency; an energy absorption element located on an outer surface of the coil as viewed in a radial direction, which, in a pressed state, permits rotation in the withdrawal direction of the coil at or above a force limiting load, when the locking section has limited rotation in the withdrawal direction of the coil; a winding section provided on the radially viewed outer side of the coil, to which the energy absorption element is anchored, and which winds the energy absorption element by rotating it through rotation of the coil when the locking section has limited the rotation of the coil; and a force limiter load generating mechanism provided on the radially viewed outside of the coil and which has a pressure section that presses the energy absorption element. [2] Belt winding device according to claim 1, wherein a presetting section is provided on an outer surface of the winding section as viewed in a radial direction, wherein the presetting section engages with the energy absorption element along an inner surface of the presetting section as viewed in a radial direction. [3] Belt winding device according to claim 1 or 2, wherein a rotation limiting section, which limits the rotation of the coil relative to the locking section to a predetermined number of revolutions, is provided between the coil and the locking section; and the winding section is provided on an outside of the rotation limiting section when viewed in a radial direction.