WO2012169327A1 - シートベルト用リトラクタ - Google Patents
シートベルト用リトラクタ Download PDFInfo
- Publication number
- WO2012169327A1 WO2012169327A1 PCT/JP2012/062581 JP2012062581W WO2012169327A1 WO 2012169327 A1 WO2012169327 A1 WO 2012169327A1 JP 2012062581 W JP2012062581 W JP 2012062581W WO 2012169327 A1 WO2012169327 A1 WO 2012169327A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pawl
- winding drum
- flange
- side wall
- engagement
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
- B60R22/40—Belt retractors, e.g. reels self-locking in an emergency responsive only to vehicle movement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
- B60R22/405—Belt retractors, e.g. reels self-locking in an emergency responsive to belt movement and vehicle movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R2022/3402—Retractor casings; Mounting thereof
Definitions
- the present invention relates to a seat belt retractor for preventing webbing from being pulled out in an emergency.
- the inner peripheral surfaces of the through holes 2d and 2e provided in the left and right side walls 2a and 2b of the frame 2 formed in a U-shape are respectively formed with mountain-shaped teeth 2f and 2g over the entire circumference.
- a reel shaft 4 for winding the webbing 3 is disposed between the left and right side walls 2a and 2b.
- Circular guide flange portions 4b and 4c are provided at the left and right ends of the webbing take-up portion 4a of the reel shaft 4, and arc-shaped retaining flanges 4m, 4r is provided. Further, the maximum dimension of the outer peripheral surface formed by the guide flange portions 4b and 4c and the retaining flanges 4m and 4r is set slightly smaller than the inner peripheral diameter of the tips of the teeth 2f and 2g.
- the guide flange portions 4b and 4c including the stop flanges 4m and 4r can pass through the through holes 2d and 2e.
- the reel shaft 4 rotates in the webbing pull-out direction by engaging the teeth 2f and 2g when necessary.
- a main pawl 17 and a backup pawl 20 are disposed so as to be able to rotate. Further, between the teeth 17d and 20d engaged with the teeth 2f and 2g of the pawls 17 and 20, raked large misalignment prevention flanges 17g and 20g are formed on the reel shaft 4 side.
- the axial load is applied to the main pawl 17 as much as the backup pawl 20. For this reason, there is a possibility that the main pawl 17 is greatly displaced in the axial direction from the teeth 2f of the frame 2 due to deformation of the large displacement prevention flange 17g, deformation of the rotation support portion of the main pawl 17 in the guide flange 4b, and the like.
- the shaft 2 may be displaced due to deformation of the frame 2 in an emergency such as a vehicle collision.
- the axial load on the large displacement prevention flange 17g of the main pawl 17 is further increased, and due to deformation of the large displacement prevention flange 17g, deformation of the rotation support portion of the main pawl 17 in the guide flange 4b, and the like.
- the main pawl 17 may be greatly displaced in the axial direction from the teeth 2 f of the frame 2.
- An object of the present invention is to provide a retractor for a seat belt capable of reducing the number of parts and reducing the weight.
- the seatbelt retractor of the present invention has a winding drum for winding and storing a webbing, and a through hole in which the winding drum is inserted into a pair of opposite side wall portions and rotatably mounted. It is disposed between the formed housing, and the winding drum and a through hole formed in one side wall portion of the pair of side wall portions. Locking means that allows rotation in the winding direction and operates when necessary to prevent rotation of the winding drum in the webbing pull-out direction, and the locking means is formed on the one side wall portion.
- the engagement side facing the engagement teeth Flange part A pawl disposed at a non-engagement position where the engagement teeth are not normally engaged and moved to an engagement position where the engagement teeth are engaged when necessary.
- the flange portion has a protruding portion formed to protrude radially outward from a peripheral portion facing the engaging portion between the pawl and the engaging tooth, and the outer diameter of the engaging side flange portion is It is formed so as to be smaller than the inner peripheral diameter of the front end of the engaging tooth, and the maximum outer dimension formed by the protruding portion and the engaging side flange portion is larger than the inner peripheral diameter of the front end of the engaging tooth.
- the maximum outer dimension formed by the protruding portion and the engagement side flange portion is formed to be larger than the inner peripheral diameter of the tip of the engagement tooth.
- the protruding height of the protruding portion protruding from the engaging flange portion can be easily increased so that the pawl is engaged with the engaging teeth. It is possible to reliably prevent the shift from the alignment position in the axial direction. Furthermore, even when a load is applied to the winding drum on the axial direction pawl side, the protruding portion protruding from the engagement side flange portion abuts on the engagement teeth and receives the load, so the load applied to the pawl can be reduced and the pawl can be reduced. It can be provided only on the engagement side flange portion facing the engagement teeth of the winding drum, and the number of parts can be reduced.
- the projecting portion has the engagement teeth in a state where a central axis of a through hole formed in the one side wall portion coincides with a rotating shaft of the winding drum.
- a stepped portion projecting at a height lower than the thickness of the pawl from at least one of both circumferential edge portions including a portion projecting radially outward from the inner circumferential diameter of the tip of the pawl, The pawl may move to the engagement position by moving inward in the circumferential direction with respect to the stepped portion.
- the engagement side flange portion has a flange portion extending radially outward from a peripheral portion on the outer side in the axial direction than the protruding portion, and the flange portion is The center axis of the through-hole formed in the one side wall and the rotation axis of the winding drum coincide with each other and are positioned on the outer side in the axial direction than the engagement tooth, and the tip of the engagement tooth You may make it protrude on the radial direction outer side rather than the inner peripheral diameter.
- the flange portion is axially inward from at least one portion facing both end portions in the circumferential direction of the engaging portion between the pawl and the engaging tooth on the axial inner side surface.
- An outer stepped portion projecting at a height lower than the thickness of the pawl, and the pawl moves in the circumferential direction relative to the outer stepped portion and moves to the engagement position. Also good.
- the through hole formed in the other side wall portion facing the one side wall portion has a semicircular arc-shaped portion whose webbing pull-out direction side is opened in a semicircular arc shape, An enlarged portion that is formed in a U-shape on the edge side of the other side wall portion continuously from the semicircular arc-shaped portion, and the enlarged portion tilts the winding drum to the one side wall portion.
- the other flange portion facing the through hole formed in the other side wall portion of the pair of flange portions is formed so as not to interfere. You may make it.
- the semicircular arc-shaped portion is formed in a state in which a center axis of a through hole formed in the one side wall portion and a rotation axis of the winding drum coincide with each other.
- the side flange portion may be formed so as to protrude outward in the radial direction from the inner peripheral surface of the semicircular arc-shaped portion adjacent to the outer side in the axial direction.
- the lock means prevents the winding drum from rotating in the webbing pull-out direction, even if a load is applied to the opposite side in the axial direction with respect to the pawl, the other flange is provided. Since the portion faces the inner side surface of the semicircular arc-shaped portion adjacent to the outside in the axial direction, it is possible to supplementarily prevent the pawl from being greatly displaced in the axial direction from the engagement position with the engagement tooth.
- the other side flange portion is configured such that the center axis of the through hole formed in the one side wall portion and the rotating shaft of the winding drum coincide with each other.
- the other side flange portion is provided so as to face each other across the arc-shaped portion, and the other side flange portion rotates the center axis of the through hole formed in the one side wall portion and the winding drum. You may make it form so that it may protrude in the radial direction outer side from the internal peripheral surface of this semi-arc-shaped part in the state in which the axis
- the seat belt retractor when the locking drum prevents the winding drum from rotating in the webbing pull-out direction, even if a load is applied to the winding drum on the axial pawl side, the seat belt retractor is provided on the other flange portion. Further, since the other side collar portion faces the outer surface of the semicircular arc-shaped portion adjacent to the inner side in the axial direction, it is possible to supplementarily prevent the pawl from largely shifting in the axial direction from the engagement position with the engagement teeth. .
- FIG. 1 is an external perspective view of a seatbelt retractor according to the present embodiment. It is a disassembled perspective view of the seatbelt retractor.
- FIG. 2 is a full sectional view taken along arrow X1-X1 in FIG.
- FIG. 2 is a full sectional view taken along arrow X2-X2 in FIG.
- It is a side view by the side of the mechanism cover unit of a housing. It is a side view by the side of the winding spring unit of a housing.
- It is a disassembled perspective view of a winding spring unit.
- It is a disassembled perspective view of a mechanism cover unit.
- It is a disassembled perspective view of a vehicle acceleration sensor. It is a perspective view of a sensor holder.
- FIG. 12 is a cross-sectional view taken along arrow X3-X3 in FIG. 11. It is a center sectional view showing a state where an inertial mass body is stationary. It is a center sectional view showing the state where the inertial mass body has moved to the tip side of the sensor lever. It is a center sectional view showing the state where the inertial mass body has moved to the shaft side of the sensor lever. It is sectional drawing which shows the state of the axial part when an inertial mass body is stationary. It is sectional drawing which shows the state of the axial part when a sensor lever rotates to the maximum rotation position. It is a disassembled perspective view of a winding drum unit.
- FIG. 21 is a left side view of FIG. 20. It is a right view of FIG.
- FIG. 21 is a cross-sectional view taken along arrow X5-X5 in FIG. 20.
- FIG. 21 is a cross-sectional view taken along arrow X6-X6 in FIG. 20. It is sectional drawing explaining the insertion method in the housing of a winding drum unit.
- FIG. 26 is a left side view of FIG. 25. It is sectional drawing explaining the insertion method in the housing of a winding drum unit. It is a left view of FIG.
- FIG. 30 is a left side view of FIG. 29. It is operation
- FIG. 34 is a cross-sectional view taken along arrow X7-X7 of FIG. 33 with a pawl inserted.
- FIG. 1 is an external perspective view of a seatbelt retractor 1 according to this embodiment.
- FIG. 2 is an exploded perspective view of the seatbelt retractor 1.
- FIG. 3 is a full sectional view taken along line X1-X1 in FIG.
- the seat belt retractor 1 is a device for winding up a webbing 3 of a vehicle, and includes a housing unit 5, a winding drum unit 6, a winding spring unit 7, and a mechanism. And a cover unit 8.
- the mechanism cover unit 8 is fixed to the outside of the housing unit 5 by the integrally formed ny latches 8A so as to cover the outside of the clutch unit 9 constituting the winding drum unit 6, and cooperates with the clutch unit 9.
- the lock mechanism 10 is configured to stop the withdrawal of the webbing 3 in response to a sudden withdrawal of the webbing 3 or a rapid acceleration change of the vehicle. (See FIG. 31).
- the take-up spring unit 7 is fixed to the outside of the housing unit 5 by each ny latch 11A integrally formed with a spring case 11 (see FIG. 7).
- the winding drum unit 6 in which the webbing 3 having the retaining pin 12 fixed at the end portion is inserted and wound is provided between the winding spring unit 7 fixed to the housing unit 5 and the mechanism cover unit 8. Is supported rotatably.
- FIG. 4 is a full sectional view taken along line X2-X2 in FIG.
- FIG. 5 is a side view of the housing on the mechanism cover unit 8 side.
- FIG. 6 is a side view of the housing on the winding spring unit 7 side.
- the housing unit 5 is formed with a U-shaped housing 15 in plan view, and a through hole 16 that is formed of a synthetic resin such as nylon and has a horizontally long rectangular shape in plan view from which the webbing 3 is drawn. And a horizontally long frame-shaped protector 17.
- the housing 15 is formed in a U-shape in plan view by extending a back plate portion 18 fixed to the vehicle body and a pair of side wall portions 21 and 22 facing each other from both side edges of the back plate portion 18. These side wall portions 21 and 22 are connected to each other by a connecting member 23. In addition, an opening is formed at the center of the back plate 18 to reduce the weight and improve the efficiency of the webbing 3 attachment operation.
- the protector 17 is formed with a wall portion 25 extending downward from a side edge portion on the back plate portion 18 side, and an engaging protrusion 26 protruding outward is formed at the lower end central portion of the wall portion 25. ing. Then, while the wall portion 25 of the protector 17 is brought into contact with the back plate portion 18 and is pushed so as to be disposed between the opposing side wall portions 21 and 22, the engaging protrusions 26 of the protector 17 are brought into contact with the back plate. The upper end edge of the opening formed in the portion 18 is elastically locked and fixed.
- the width dimension in the longitudinal direction of the through hole 16 of the protector 17 is formed to be substantially equal to the width dimension of the webbing 3. Further, the width dimension of the through-hole 16 in the short direction is formed so as to be substantially opposed to the outer peripheral surface from the minimum winding diameter to the maximum winding diameter of the webbing 3, so that the webbing 3 can be smoothly pulled out and taken up. Can be done.
- a circular through hole 28 is formed in the substantially central portion of the side wall portion 21 to which the mechanism cover unit 8 is attached, and the inner peripheral surface of the through hole 28 is further formed.
- a mountain-shaped engaging tooth 28A is formed over the entire circumference.
- the engaging teeth 28A engage with a pawl 29 which is arranged so as to be able to protrude and retract from the outer peripheral surface of the winding drum unit 6, so that the rotation of the winding drum unit 6 in the webbing pull-out direction is stopped. It is configured (see FIG. 32).
- a reinforcing groove 31 that is recessed in a substantially semicircular cross section in the inner direction (the left side direction in FIG. 4) passes through the side wall portion 21 at the peripheral portion on the back plate portion 18 side of the through hole 28. It is formed in an arc shape so as to be concentric with the hole 28. Further, the side wall portion 21 has a predetermined outwardly outward direction (leftward direction in FIG. 2) at three corners of both corners of the upper end edge portion and the lower end edge portion almost directly below the central axis 28B of the through hole 28. Each mounting hole 32 burring-processed so that it may protrude in height (for example, about 1.5 mm in height) is penetrated and formed.
- each ny latch 8A of the mechanism cover unit 8 is fitted in each mounting hole 32 and attached. Further, the periphery of the base end portion of each ny latch 8A comes into contact with the tip end portion of each mounting hole 32 projecting a predetermined height outward by burring, so that the tip end of each nai latch 8A attached to each mounting hole 32
- the protruding height at which the portion protrudes from the inner surface of the side wall portion 21 can be lowered (for example, the protruding height can be lowered from about 2 mm to about 0.5 mm).
- a substantially rectangular opening 33 is formed below the through hole 28 in the side wall portion 21 at a portion on the back plate 18 side from almost right below the central axis 28B of the through hole 28.
- the sensor cover 35 (see FIG. 8) of the mechanism cover unit 8 is inserted into the opening 33 in a closed state.
- the central portion of the side wall portion 22 to which the winding spring unit 7 is attached has a substantially semicircular arc shape in which the webbing pull-out direction side is centered on the central axis 28 ⁇ / b> B of the through hole 28.
- a through-hole 38 is formed which includes an established semicircular arc-shaped portion 36 and an enlarged portion 37 that is continuous with the semicircular arc-shaped portion 36 and is opened substantially in a U-shape toward the lower edge of the side wall portion 22.
- the inner peripheral diameter of the semicircular arc-shaped portion 36 formed in the side wall portion 22 is the inner periphery of the tip of the engaging tooth 28 ⁇ / b> A of the through hole 28 formed in the side wall portion 21. It is formed to be smaller than the diameter D1.
- a plurality of (seven in FIG. 6) small chevron protrusions 39 are formed on the inner peripheral surface of the upper end edge of the semicircular arc-shaped portion 36 with an inner peripheral diameter of radius R1.
- substantially U-shaped enlarged portion 37 formed on the side wall portion 22 extends downward from both lower end portions of the semicircular arc-shaped portion 36 while extending slightly outward in the left-right direction, and the lower end edge portion is a through hole of the side wall portion 21. 28 is opened so as to face the opening 33 formed below 28.
- the side wall portion 22 has a semicircular arc-shaped portion 36 and a peripheral portion on the back plate portion 18 side of the enlarged portion 37 in the inner direction (rightward direction in FIG. 4).
- Reinforcing grooves 41 that are recessed in a substantially semicircular cross section are formed.
- the reinforcing groove 41 is formed in a circular arc shape concentric with the semicircular arc portion 36 along the peripheral edge portion of the semicircular arc portion 36, and along the peripheral edge portion of the enlarged portion 37.
- the lower end of the through hole 28 is substantially opposed to the lower end of the through hole 28.
- the side wall portion 22 has a predetermined height (for example, rightward direction in FIG. 2) at three locations, that is, both corners of the upper end edge portion and the lower end edge portion below the reinforcing groove 41.
- the height is about 1.5 mm.
- Each mounting hole 42 burring so as to protrude is formed through. Then, each ny latch 11 ⁇ / b> A provided in the cover case 11 of the take-up spring unit 7 is fitted into each attachment hole 42 and attached.
- each ny latch 11A comes into contact with the tip end portion of each mounting hole 42 projecting a predetermined height outward by burring, so that the tip end of each nai latch 11A attached to each mounting hole 42
- the protruding height at which the portion protrudes from the inner surface of the side wall portion 22 can be reduced (for example, the protruding height can be reduced from about 2 mm to about 0.5 mm).
- FIG. 7 is an exploded perspective view of the winding spring unit 7.
- the take-up spring unit 7 is fixed to a spiral spring 45 and a rib 46 whose outer end 45 ⁇ / b> A is erected from the bottom surface of the inner peripheral edge.
- a spring case 11 that houses the spiral spring 45, a spring shaft 47 to which the inner end 45B of the spiral spring 45 is coupled and the spring force is biased, and a spring seat 48 that is attached to the spring case 11 and covers the spiral spring 45 It is composed of
- the spring shaft 47 has a pin 49 erected at a substantially central position of the bottom surface of the spring case 11 inserted into a through hole 47A in the bottom surface so that the bottom surface is rotatably supported. Further, the end of the spring shaft 47 on the spring seat 48 side rotates to a stepped portion having a circular cross section formed around the base end of a substantially cylindrical boss portion 48A provided at the center of the spring seat 48. Supported as possible.
- the spring seat 48 is fixed by elastically locking the locking projections 48B provided at three locations on the outer peripheral portion to the locking holes 11B provided at the open side peripheral edge of the spring case 11. Yes.
- the spring side shaft 51 of the winding drum unit 6 is rotatably supported by being inserted into a substantially cylindrical boss portion 48A provided at the center portion of the spring seat 48, and has an H-shaped cross section.
- the tip portion formed in a shape is fitted into a cylinder formed in a H-shaped section of the spring shaft 47 and is connected to the spring shaft 47 so as not to be relatively rotatable.
- the biasing force of the spiral spring 45 is always biased to the winding drum unit 6 via the spring shaft 47 so as to rotate in the winding direction of the webbing 3.
- a ring-shaped rib 52 is provided on the surface of the spring seat 48 on the side wall 22 side so as to cover the outer peripheral portion of the end edge portion of the winding drum unit 6, and radially outward from the outer peripheral surface of the rib 52.
- a plurality of reinforcing ribs 53 are provided up to the outer peripheral portion radially.
- the upper end portion of each reinforcing rib 53 facing the enlarged portion 37 formed on the side wall portion 22 of the housing 15 is arranged from the outer peripheral surface of the rib 52 to the inner peripheral surface of the enlarged portion 37.
- a positioning portion 53A is formed so as to protrude at a height substantially equal to the thickness of the side wall portion 22 up to a position opposite to.
- a cylindrical positioning boss 54 is erected on the outer side of the rib 52 of the spring seat 48.
- the winding spring unit 7 is inserted into each of the ny latches while the positioning boss 54 is fitted into the positioning hole 56 (see FIG. 6) formed in the peripheral edge portion of the semicircular arc-shaped portion 36 of the side wall portion 22 on the connecting member 23 side.
- the positioning portions 53A of the respective reinforcing ribs 53 have substantially the same height as the inner side surface of the side wall portion 22.
- FIG. 8 is an exploded perspective view of the mechanism cover unit 8.
- the mechanism cover unit 8 includes a mechanism cover 58 attached to the outside of the side wall portion 21 of the housing 15 so as to cover the clutch unit 9 by each ny latch 8 ⁇ / b> A, It is comprised from the vehicle acceleration sensor 61 as an emergency lock starting device accommodated in the sensor accommodating part 59.
- the mechanism cover 58 is provided with an annular rib portion 62 erected on the inner surface facing the clutch unit 9 coaxially with the central axis 28B of the through hole 28 of the side wall portion 21, and the inner peripheral surface of the rib portion 62.
- a lock gear 66 that engages with an engagement claw 65 of the lock arm 63 is formed (see FIG. 31).
- the lock gear 66 is configured to engage with the engagement claw 65 of the lock arm 63 only when the clutch unit 9 rotates in the webbing pull-out direction as described later (see FIG. 31).
- a substantially cylindrical support boss 67 is erected at the center of the annular rib portion 62.
- a tip end portion of the mechanism side shaft 68 of the take-up drum unit 6 is fitted to the support boss 67 through a bearing cap 71 so as to be slidably rotatable.
- the sensor accommodating part 59 is formed in the concave shape of a substantially square cross section, and a pair of locking holes 72 formed on the back side of the both side walls are formed.
- the locking claws 75 of the sensor cover 35 are attached to the upper end of the sensor housing portion 59.
- the mechanism cover unit 8 is configured by being fitted and locked in the provided locking hole 76.
- an opening 77 communicating with the sensor housing portion 59 is formed below the annular rib portion 62.
- FIG. 9 is an exploded perspective view of the vehicle acceleration sensor 61.
- FIG. 10 is a perspective view of the sensor holder 82 of FIG. 9 as viewed from the back side.
- FIG. 11 is a front view of the sensor lever 85 as viewed from the side where it is attached to the sensor holder 82.
- 12 is a cross-sectional view taken along arrow X3-X3 in FIG.
- FIGS. 13 to 17 are explanatory views for explaining the operation state of the sensor lever 85 that swings up and down by the movement of the inertial mass body 83.
- the vehicle acceleration sensor 61 includes a resin-made sensor holder 82 having a substantially box shape opened on the top surface and a mortar-shaped mounting portion 81 formed on the bottom surface, and steel or the like.
- An inertia mass body 83 formed in a spherical shape with metal and movably placed on the placement portion 81, and a resin that is disposed above the inertia mass body 83 and supported by the sensor holder 82 so as to be swingable.
- Sensor lever 85 is provided in a resin-made sensor holder 82 having a substantially box shape opened on the top surface and a mortar-shaped mounting portion 81 formed on the bottom surface, and steel or the like.
- An inertia mass body 83 formed in a spherical shape with metal and movably placed on the placement portion 81, and a resin that is disposed above the inertia mass body 83 and supported by the sensor holder 82 so as to be swingable.
- Sensor lever 85 is provided in a resin
- the shaft portions 86 and 87 are provided on the same axial center in the outward direction from both side surface portions of one end portion in the longitudinal direction. .
- the outer diameter of the shaft portion 86 located on the back side of the sensor housing portion 59 is slightly thicker than the shaft portion 87 located on the sensor cover 35 side. It is formed to become.
- the base end portion of the shaft portion 86 has a protruding portion formed in a rectangular shape with a predetermined axial thickness (for example, a thickness of about 0.7 mm to 1.0 mm) having a substantially axial diameter width in front view. 88 protrudes upward.
- a pair of support wall portions 91 and 92 are provided upward at one end of each of the side wall portions 82A and 82B facing the shaft portions 86 and 87 of the sensor holder 82, respectively. Is provided so as to protrude. Further, support holes 91A and 92A are formed above the support wall portions 91 and 92 so as to penetrate in the thickness direction with an inner diameter substantially equal to the diameter of the shaft portions 86 and 87, respectively.
- a rotation stopper portion that is notched with a width that is substantially equal to the inner diameter of the support hole 91A from the center to the upper end of the support hole 91A and a depth that is substantially equal to the thickness of the protruding portion 88.
- a notch groove 93 is formed on the inner side surface of the support wall portion 91.
- the inner wall of the cutout groove 93 on the mounting portion 81 side is formed so as to incline in an obliquely outward direction (upper right direction in FIG. 10) from the outer peripheral portion to the upper end of the support hole 91A.
- the shaft portions 86 and 87 of the sensor lever 85 are fitted into the support holes 91A and 92A from above, whereby the sensor lever 85. Is supported rotatably in the vertical direction. Further, as will be described later, the protrusion 88 formed at the base end portion of the shaft portion 86 is loosely fitted into a notch groove 93 formed upward from the support hole 91 ⁇ / b> A so that the maximum upward of the sensor lever 85 is achieved.
- the rotation angle is regulated (see FIG. 17).
- the sensor lever 85 has a predetermined thickness over the entire width in the width direction (in FIG. 11, the left-right direction) from one edge in the longitudinal direction to the lower side.
- an extension portion 95 extending to the lower side of the shaft portions 86 and 87 is formed (for example, the thickness is about 2 mm).
- the lower end portion of the extending portion 95 has a width that is about 1/3 of the entire width of the extending portion 95 in the rotation axis direction from the inner corner portion on the shaft portion 87 side, and
- An abutment lever 96 having a rectangular cross section extending further downward with a thickness of about half the thickness is provided.
- the contact lever 96 may be extended downward from the inner corner of the lower end portion of the extending portion 95 on the shaft portion 86 side.
- the sensor holder 82 extends further upward from the upper end of the side wall portion.
- a protruding regulation wall 97 is provided.
- the upper end of the restriction wall portion 97 is formed so as to be located slightly below the lower end portion of the extension portion 95 of the sensor lever 85 pivotally supported by the support wall portions 91 and 92. Then, the lower end portion of the contact lever 96 contacts the inner side surface of the restriction wall portion 97, and the downward rotation range of the sensor lever 85 is restricted.
- the extension portion 95 and the contact lever 96 function as a contact portion.
- the sensor lever 85 is provided with a bowl-shaped cover portion 98 that covers the upper side of the inertia mass body 83.
- a lock claw 99 protruding in an obliquely upward direction is provided on the upper surface of the cover portion 98 opposite to the extending portion 95.
- the inertia mass body 83 placed on the placement portion 81 and the inner wall surface of the sensor holder 82 surrounding the circumference thereof are appropriately formed with a gap over the entire circumference in the circumferential direction.
- the inertia mass body 83 is configured to move on the mounting portion 81 and be movable within the gap.
- a contact portion 98A that is recessed in a bowl shape is formed so as to face the outer surface portion of the stationary inertia mass body 83. Then, the inertia mass body 83 moves on the mounting portion 81, contacts the contact portion 98 ⁇ / b> A that is recessed in a bowl shape on the lower surface side of the cover portion 98, and pushes upward so that the sensor lever 85 moves upward. It is rotated.
- a communication hole 101 communicating with the lower surface is formed at the center of the mounting portion 81.
- the vertical rotation range of the sensor lever 85 will be described with reference to FIGS.
- the sensor lever 85 rotates downward by its own weight, and the lower end portion of the contact lever 96. Is in contact with the inner side surface of the restriction wall 97, and the rotational range of the sensor lever 85 in the lower direction is restricted.
- a gap 102 of a predetermined distance (for example, a gap of a distance of about 0.5 mm) is formed between the contact portion 98A that is recessed in a bowl shape on the lower surface side of the cover portion 98 and the inertia mass body 83. ing.
- a narrow gap is formed between the protruding portion 88 formed at the base end portion of the shaft portion 86 and the inner wall surface on the mounting portion 81 side of the notch groove 93 of the support wall portion 91. Therefore, when the fluctuation of the acceleration of the vehicle is within a fluctuation range where the inertial mass body 83 does not contact the contact portion 98A of the sensor lever 85, the contact of the sensor lever 85 even if the sensor lever 85 swings in the vertical direction. Contact between the portion 98A and the inertia mass body 83 can be prevented.
- the inertia mass body 83 moves on the mounting portion 81 and contacts and presses the contact portion 98A on the lower surface side of the cover portion 98.
- the position where the sensor lever 85 rotates upward is the position where the lock claw 99 comes into contact with the clutch gear 112 (see FIG. 31) of the locking clutch 106 constituting the clutch unit 9 described later.
- the maximum rotation position of the sensor lever 85 in the upward direction is set above the position where the lock pawl 99 contacts the clutch gear 112.
- the maximum rotation position of the sensor lever 85 in the upward direction is such that the protruding portion 88 formed at the base end portion of the shaft portion 86 is relative to the placement portion 81 of the notch groove 93 of the support wall portion 91. It is set by contacting the inner wall surface on the opposite side and restricting the rotation range of the sensor lever 85 in the upward direction.
- the gap 103 between the sensor lever 85 and the peripheral wall portion of the sensor holder 82 when the sensor lever 85 reaches the maximum rotational position in the upper direction is set to be smaller than the diameter of the inertia mass body 83. It is configured. Further, the lower end portion of the contact lever 96 of the sensor lever 85 is separated from the inner surface of the restriction wall portion 97 and is rotated toward the placement portion 81 side. The lower end portion of the contact lever 96 and the bottom surface portion of the sensor holder 82 are configured not to contact each other, and the sensor lever 85 is configured to smoothly rotate in the vertical direction.
- FIG. 18 is an exploded perspective view of the winding drum unit 6.
- FIG. 19 is an exploded perspective view of the clutch unit 9.
- the winding drum unit 6 includes a winding drum 105 around which the webbing 3 is wound, and a through hole 28 formed in the side wall portion 21 of the housing 15.
- the pawl 29 is engaged with the tooth 28 ⁇ / b> A, the clutch unit 9, and the bearing cap 71.
- the clutch unit 9 includes a locking clutch 106, a lock arm 63, a sensor spring 107, and a return spring 108.
- the locking clutch 106 is erected in an annular shape from the entire circumference of the disk-shaped bottom surface portion 111 having a diameter larger than the outer diameter of the annular rib portion 62 of the mechanism cover 58 to the mechanism cover 58 side.
- a clutch gear 112 that engages with the lock claw 99 of the sensor lever 85 of the vehicle acceleration sensor 61 is formed.
- the clutch gear 112 is formed to engage with the lock claw 99 of the sensor lever 85 only when the locking clutch 106 rotates in the webbing pull-out direction (see FIG. 31).
- a substantially cylindrical boss 113 is erected on the surface on the mechanism cover 58 side at the center of the bottom surface portion 111 of the locking clutch 106 and communicates with the winding drum 105 side.
- a pivot shaft 115 is erected on the bottom surface portion 111 of the locking clutch 106 adjacent to the boss 113 at substantially the same height as the clutch gear 112.
- the synthetic resin lock arm 63 formed in a substantially arcuate shape so as to surround the boss 113 has a pivot shaft 115 in a through hole 116 formed in an end edge portion on the boss 113 side at a substantially central portion in the longitudinal direction. Inserted and pivotally supported.
- the bottom surface portion 111 of the locking clutch 106 is provided with a spring support pin 117 projecting from a rib portion extending radially outward from the outer peripheral surface of the boss 113. Then, one end side of the sensor spring 107 is fitted into the spring support pin 117, and the other end side of the sensor spring 107 is placed in a recess 118 formed on the end portion of the lock arm 63 opposite to the engaging claw 65. Fit.
- the lock arm 63 is biased with a predetermined load so as to rotate in the webbing pull-out direction side with respect to the axis of the pivot shaft 115, and an end edge portion on the side opposite to the engagement claw 65 is applied to the bottom surface portion 111. It is in contact with a standing stopper 119.
- the outer edge of the engagement claw 65 is The locking clutch 106 is configured to be able to come into contact with a rotation stop 121 having a substantially triangular cross section standing on the bottom surface portion 111 of the locking clutch 106 (see FIG. 31).
- an interlocking pin 122 projecting from a side surface portion on the engaging claw 29A side of the pawl 29 is slidably fitted on the radially outer side of the spring support pin 117.
- An elongated protruding guide groove 123 is formed.
- the protruding guide groove 123 is formed so that the edge portion on the webbing pull-out direction side is gradually separated from the center of the bottom surface portion 111.
- a spring mounting portion 125 (see FIG. 3) in which a recess into which one end side of the return spring 108 is fitted is formed on the bottom surface portion 111 of the locking clutch 106 on the winding drum 105 side. Projected to. Therefore, as shown in FIG. 18, the clutch unit 9 has the boss 113 fitted into the base end portion of the mechanism side shaft 68 with the one end side of the return spring 108 fitted into the spring mounting portion 125 and the pawl 29. The interlocking pin 122 is inserted into the protruding guide groove 123.
- the return spring 108 and the spring mounting portion 125 are arranged in a horizontally long fitting recess 126 formed on the end surface of the winding drum 105 with the return spring 108 contracted.
- a bearing cap 71 is fitted into a spline formed at the tip of the mechanism-side shaft 68 protruding from the boss 113 of the clutch unit 9 so as to be relatively non-rotatable.
- the clutch unit 9 is pushed by the return spring 108 in the webbing pull-out direction side and is rotated along with the take-up drum 105 while the pawl 29 is drawn into the take-up drum 105.
- FIG. 20 is a front view of the pawl 29 inserted into the winding drum 105.
- FIG. 21 is a left side view of FIG.
- FIG. 22 is a right side view of FIG. 23 is a cross-sectional view taken along arrow X5-X5 in FIG. 24 is a cross-sectional view taken along arrow X6-X6 in FIG.
- the winding drum 105 formed of an aluminum material or the like is provided with a webbing winding part 131 at the center in the axial direction, and the webbing winding part 131 has webbing 3 at both ends.
- a mechanism side flange portion 132 on the mechanism cover unit 8 side that guides winding and drawing and a winding spring side flange portion 133 on the winding spring unit 7 side are provided.
- the mechanism side shaft 68 is erected at the center position of the axially outer end surface of the mechanism side flange portion 132, and the spring side shaft 51 is erected at the center position of the axially outer end surface of the winding spring side flange portion 133. Yes.
- the webbing take-up portion 131 has a slit 135 through which the webbing 3 is inserted, which rotates across the entire width between the mechanism side flange portion 132 and the take-up spring side flange portion 133. It is opened in the radial direction including the shaft. Further, the insertion opening 136 for inserting the webbing 3 of the slit 135 is enlarged symmetrically in the circumferential direction so that the retaining pin 12 can be placed, and the webbing 3 wound around the retaining pin 12 is the webbing take-up portion 131. It is comprised so that it may be located inside the webbing winding surface.
- the mechanism side flange portion 132 and the winding spring side flange portion 133 are coaxial with the rotation center of the webbing winding portion 131 and are formed in a circle having substantially the same size. Further, as shown in FIG. 23, the outer diameter D2 of each of the mechanism side flange portion 132 and the take-up spring side flange portion 133 is determined by the engagement teeth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21. It is set to be slightly smaller than the inner peripheral diameter D1 of the tip.
- the mechanism side flange 132 has a pawl 29 that protrudes inward and outward from the outer periphery on the radially opposite side of the fitting recess 126 in which the return spring 108 is accommodated.
- a substantially bow-shaped pawl housing recess 137 is formed to accommodate it.
- the pawl housing recess 137 is formed so as to have a depth substantially the same as the thickness of the pawl 29, and the outer side in the axial direction of the pawl 29 on the outlet side is covered with a pawl guiding flange 138.
- a guide groove 139 into which an interlocking pin 122 erected on the side surface of the pawl 29 is slidably inserted is provided at the end edge of the pawl guide flange 138 on the webbing take-up direction side. Notched in the direction.
- the interlocking pin 122 protruding from the guide groove 139 is slidably fitted into the protruding guide groove 123 of the locking clutch 106.
- edge on the outer side in the axial direction of the mechanism side flange 132 extends radially outward from the outer peripheral surface excluding the pawl outlet side opening portion of the pawl receiving recess 137, and functions as an example of a flange.
- a retaining flange 141 having a substantially C shape in front view is provided. Further, as shown in FIG. 21, the outer diameter D3 of the retaining flange 141 is larger than the inner peripheral diameter D1 of the front end of the engaging tooth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21.
- the retaining flange 141 has an inner peripheral diameter at the tip of the engaging tooth 28A adjacent in the axial direction. It protrudes radially outward from D1.
- edge of the mechanism side flange portion 132 on the webbing take-up portion 131 side is from the peripheral portion including the opening portion on the pawl exit side of the pawl receiving recess 137, that is, the relationship between the pawl 29 and the engaging teeth 28A.
- a protruding flange 142 that protrudes in a substantially arc shape in the protruding movement direction of the pawl 29 and functions as an example of a protruding portion is provided from the peripheral portion facing the mating portion.
- the side surface of the projecting flange 142 on the side of the pawl 29 and the bottom surface portion of the pawl housing recess 137 are formed so as to be located on the same plane, and the side surface portion of the pawl 29 is configured to smoothly slide and move. .
- the maximum external dimension D4 formed by the projecting flange 142 and the mechanism side flange portion 132 is the tip of the engaging tooth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21. It is set to be larger than the inner peripheral diameter D1. Therefore, in a state where the rotation axis of the winding drum 105 and the central axis 28B of the through hole 28 of the side wall portion 21 coincide with each other, the protruding flange 142 is smaller than the inner peripheral diameter D1 of the tip of the engaging tooth 28A adjacent to the outside in the axial direction. Also protrudes radially outward.
- the axially outer side surface of the projecting flange 142 is pawled outward in the axial direction at a portion on both sides in the circumferential direction from the pawl outlet side opening portion of the pawl receiving recess 137.
- step-difference part 143 which protrudes by the height (for example, height is about 1 mm) lower than the thickness of 29 is provided (refer FIG. 18).
- Each inner stepped portion 143 has an inner peripheral diameter D1 at the tip of the engaging tooth 28A adjacent to the outside in the axial direction in a state where the rotation axis of the winding drum 105 and the central shaft 28B of the through hole 28 of the side wall portion 21 coincide.
- the protrusion flange 142 is provided at both end edges in the circumferential direction so as to protrude outward in the radial direction.
- the axially inner side surface of the retaining flange 141 is located on the outer side in the circumferential direction of the pawl outlet side of the pawl housing recess 137 at a portion facing each inner step 143 in the axial direction.
- Each outer stepped portion 145 that protrudes inwardly at a height lower than the thickness of the pawl 29 (for example, about 1 mm in height) is provided (see FIG. 18). Accordingly, as shown in FIGS. 20 and 23, the pawl 29 moves between the inner step portions 143 and between the outer step portions 145 and is formed on the inner peripheral surface of the through hole 28. It moves to the engaging position where it engages with the tooth 28A (see FIG. 32).
- a substantially annular rib portion 146 is provided on the axially outer end surface of the take-up spring side flange portion 133 having the outer diameter D ⁇ b> 2.
- the shaft is erected coaxially so as to reach the outer side in the axial direction than the side wall portion 22.
- the outer diameter D5 of the substantially annular rib portion 146 is smaller than the inner peripheral diameter of the radius R1 of the tip of the chevron 39 formed on the inner peripheral surface of the semicircular arc-shaped portion 36 of the side wall portion 22. It is set (see FIG. 29).
- annular outer flange that functions as an example of the other side flange portion that extends radially outward from the outer peripheral surface of the axially outer edge of the annular rib portion 146 over the entire circumference. 147 is provided. Further, the outer diameter D6 of the outer flange 147 is larger than the inner peripheral diameter of the radius R1 of the tip of the chevron projection 39 formed on the inner peripheral surface of the semicircular arc-shaped portion 36 of the side wall portion 22, and the semicircular arc-shaped portion It is set to be approximately the same as the inner peripheral diameter of 36.
- the outer flange 147 is located inside the semicircular arc-shaped portion 36 adjacent to the inner side in the axial direction. It protrudes radially outward from the inner peripheral diameter of the radius R1 at the tip of the chevron 39 formed on the peripheral surface (see FIG. 29). As will be described later, the outer flange 147 can enter the enlarged portion 37 of the side wall portion 22 (see FIG. 27).
- FIGS. 25 to 30 are explanatory views for explaining a method of inserting the take-up drum unit 6 into the housing 15.
- the winding drum unit 6 is arranged so that the substantially central portion in the circumferential direction of the projecting flange 142 formed on the mechanism side flange portion 132 of the winding drum 105 is positioned on the upper side in the vertical direction.
- the clutch unit 9 is gripped.
- the winding spring side flange portion 133 is formed on the side wall portion 21 of the housing 15 in a state where the winding drum unit 6 is tilted so that the winding spring side flange portion 133 is below the mechanism side flange portion 132.
- the protruding flange 142 is inserted into the housing 15 from the through hole 28 through the through hole 28. Further, the spring side shaft 51 of the winding drum 105 slightly protrudes outward from the enlarged portion 37 of the through hole 38 formed in the side wall portion 22.
- the winding drum unit 6 is slightly moved in a state where the winding drum unit 6 is inclined so that the winding spring side flange portion 133 is below the mechanism side flange portion 132.
- the mechanism side flange portion 132 is inserted into the housing 15 by being inserted into the through hole 28 of the side wall portion 21 while being lifted upward. Further, the upper peripheral edge of the retaining flange 141 provided at the end edge on the axially outer side of the mechanism side flange 132 is brought into contact with the outer surface of the side wall 21.
- the outer flange 147 and the take-up spring side flange portion 133 of the take-up drum 105 are inclined in the downward direction, and the semicircular arc-shaped portion 36 and the enlarged portion 37 of the through hole 38 formed in the side wall portion 22. It is inserted into the continuous part. For this reason, the upper peripheral edge of the outer flange 147 protrudes outward from the semicircular arc portion 36 of the side wall 22.
- the outer flange 147 and the winding spring side flange 133 of the winding drum 105 are lifted upward so that the winding drum 105 is substantially horizontal, and the winding drum 105
- the rotation shaft 105A and the central axis 28B of the through hole 28 in the side wall portion 21 are made to coincide with each other. That is, as shown in FIG. 3, the mechanism side shaft 68 of the winding drum unit 6 is pivotally supported by the mechanism cover unit 8, and the spring side shaft 51 of the winding drum unit 6 is pivotally supported by the winding spring unit 7.
- the protruding flange 142 provided on the mechanism side flange portion 132 protrudes outside the inner peripheral diameter D1 of the front end of the engaging tooth 28A provided on the inner peripheral surface of the through hole 28 of the side wall portion 21.
- the mechanism side flange portion 132 is positioned inside the inner peripheral diameter D1 at the tip of the engaging tooth 28A.
- the outer peripheral edge portion of the mechanism side flange portion 132 in the radial direction of the retaining flange 141 protrudes outside the inner peripheral diameter D1 of the tip of the engagement tooth 28A provided on the inner peripheral surface of the through hole 28. .
- each inner stepped portion 143 provided on the axially outer side surface of the projecting flange 142 and each outer stepped portion 145 provided on the axially inner side surface of the retaining flange 141 are adjacent to the engagement teeth. It protrudes outside the inner peripheral diameter D1 of the tip of 28. Further, the winding spring side flange portion 133 and the outer flange 147 are larger than the inner peripheral diameter of the radius R1 of the tip of the chevron 39 provided on the inner peripheral surface of the semicircular arc-shaped portion 36 of the through hole 38 of the side wall portion 22. Projects outward.
- the outer peripheral surface of the rib portion 146 erected on the outer side in the axial direction of the winding spring side flange portion 133 is the inner periphery of the radius R1 of the tip of the chevron projection 39 provided on the inner peripheral surface of the semicircular arc-shaped portion 36. Located inside the diameter.
- the reinforcing groove 41 is formed in the inner direction of the side wall portion 22 so that the protruding portion toward the inner side of the side wall portion 22 is substantially flush with the inner side surface in the axial direction of the winding spring side flange portion 133 of the winding drum 105. 4 in the right direction. Further, in the reinforcing groove 41 provided in the side wall portion 22, the winding diameter of the webbing 3 wound around the webbing winding portion 131 of the winding drum 105 becomes the outer diameter D2 of the winding spring side flange portion 133. In this case, the side edge of the webbing 3 is provided so as to face the reinforcing groove 41.
- the reinforcing groove 41 provided in the side wall portion 22 is provided in the webbing 3 even when the winding diameter of the webbing 3 wound around the webbing winding part 131 of the winding drum 105 reaches the maximum winding diameter D7.
- the side edge portion is provided along the peripheral edge portion of the enlarged portion 37 so as to face the reinforcing groove 41. Therefore, when the webbing 3 is pulled out and wound, the side edge portion facing the side wall portion 22 of the webbing 3 is brought into contact with the axial inner side surface of the winding spring side flange portion 133 or the reinforcing groove 41 and the side edge portion. Are aligned and wound so as not to ride on the winding spring side flange portion 133.
- FIG. 31 is an explanatory view of the operation of the lock mechanism 10.
- FIG. 32 is a side view showing a locked state in which the pawl 29 is engaged with the engaging teeth 28A.
- the operation of the lock mechanism 10 includes a “webbing sensitive lock mechanism” that stops the pulling out of the webbing 3 by abrupt pulling out of the webbing 3, and a “stopping the pulling out of the webbing 3 in response to a sudden change in acceleration of the vehicle”. There is a “body-sensitive lock mechanism”.
- the pull-out acceleration of the webbing 3 is a predetermined acceleration (for example, about 2.0G).
- a predetermined acceleration for example, about 2.0G.
- the lock arm 63 that has been in contact with the stopper 119 maintains the initial position against the biasing force of the sensor spring 107, so that the webbing pull-out direction is centered on the pivot shaft 115 with respect to the locking clutch 106. It is rotated in the opposite direction (clockwise in FIG. 31) until it comes into contact with the detent 121. Therefore, the engagement claw 65 of the lock arm 63 is rotated radially outward with respect to the rotation shaft of the locking clutch 106 and engages with the lock gear 66 of the rib portion 62 of the mechanism cover 58, where the locking clutch The accompanying rotation of the winding drum 105 with the winding drum 105 is stopped.
- the interlocking pin 122 erected on the side surface of the pawl 29 with the rotation of the winding drum 105 slides in the protruding guide groove 123. Move. Along with this sliding movement, the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the winding drum 105, protrudes radially outward, and penetrates the side wall portion 21.
- the engaging claw 29A is engaged with the engaging teeth 28A formed on the inner peripheral surface of the hole 28. As a result, the winding drum 105 is prevented from rotating and the drawing of the webbing 3 is stopped.
- the lock arm 63 when the sudden withdrawal of the webbing 3 is released, the lock arm 63 returns to the initial position where it abuts against the stopper 119 by the urging force of the sensor spring 107. Therefore, the engagement between the engagement claw 65 of the lock arm 63 and the lock gear 66 of the rib portion 62 of the mechanism cover 58 is released. Due to the urging force of the return spring 108, the locking clutch 106 is rotated relative to the winding drum 105 in the webbing pull-out direction (in the direction of the arrow 151), and the interlocking pin 122 moves in the protruding guide groove 123 by this rotation. It slides and returns to the initial position shown in FIG.
- the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the winding drum 105 and is pulled inward in the radial direction, so that the pawl housing concave portion is moved. It is accommodated in 137 and buried in the mechanism side flange portion 132.
- the accompanying rotation of the locking clutch 106 with the winding drum 105 is started, and the webbing 3 is returned to a state in which the webbing 3 can be pulled out and wound.
- the sensor lever 85 is pushed upward by the mass inertial body 83, and the lock claw 99 of the sensor lever 85 protrudes from the opening 77 of the mechanism cover 58 and is formed on the outer peripheral portion of the locking clutch 106. 112, and the accompanying rotation of the locking clutch 106 with the winding drum 105 is stopped. For this reason, when a load in the pull-out direction is applied to the webbing 3, the take-up drum 105 rotates in the webbing pull-out direction (in the direction of arrow 151) against the urging force of the return spring 108.
- the interlocking pin 122 erected on the side surface of the pawl 29 slides in the protruding guide groove 123.
- the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the winding drum 105, protrudes radially outward, and penetrates the side wall portion 21.
- the engaging claw 29A is engaged with the engaging teeth 28A formed on the inner peripheral surface of the hole 28. As a result, the winding drum 105 is prevented from rotating and the drawing of the webbing 3 is stopped.
- the inertial mass body 83 moves on the mounting portion 81 of the sensor holder 82 by the gravitational action and is returned to the center position of the mounting portion 81.
- the locking clutch 106 is rotated relative to the winding drum 105 in the webbing pull-out direction (in the direction of the arrow 151) by the urging force of the return spring 108.
- the interlocking pin 122 slides in the protruding guide groove 123 and returns to the initial position shown in FIG.
- the sensor lever 85 is rotated downward by its own weight, and the contact lever 96 extending downward from the extending portion 95 formed on one end side of the sensor lever 85 serves as a restriction wall portion of the sensor holder 82.
- a predetermined gap 102 is formed between the inertia mass body 83 and the contact portion 98A by contacting the inner surface of 97 (see FIG. 13). Further, the lock claw 99 of the sensor lever 85 is rotated downward and is accommodated in the opening 77 of the mechanism cover 58.
- the interlocking pin 122 slides in the protruding guide groove 123, the interlocking pin 122 slides in the guide groove 139 formed in the pawl guide flange 138 of the take-up drum 105, so that the radial direction It is pulled inward and moved into the pawl housing recess 137 and buried in the mechanism side flange portion 132.
- the accompanying rotation of the locking clutch 106 with the take-up drum 105 is started, and the webbing 3 is returned to a state where the webbing 3 can be pulled out and taken up.
- the lock mechanism 10 operates in response to a sudden pull-out of the webbing 3 or a sudden acceleration change of the vehicle. Rotation in the webbing pull-out direction is prevented.
- the winding drum 105 is prevented from rotating in the webbing pull-out direction, even if a load is applied from the webbing 3 to the winding drum 105 on the axial pawl 29 side, the mechanism side flange portion 132 outwards in the radial direction.
- the protruding flange 142 that protrudes faces the engaging tooth 28A adjacent to the outside in the axial direction, it is possible to reliably prevent the pawl 29 from being greatly displaced outward in the axial direction from the engaging position with the engaging tooth 28A. .
- the maximum outer dimension D4 formed by the protruding flange 142 and the mechanism side flange portion 132 is larger than the inner peripheral diameter D1 of the tip of the engagement tooth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21. Is set to Thereby, even when the mechanism side flange portion 132 moves to the opposite side with respect to the pawl 29 due to the reaction force that the engaging claws 29A and the engaging teeth 28A of the pawl 29 lock, The projecting flange 142 can be opposed to the adjacent engaging tooth 28A, and the pawl 29 can be reliably prevented from greatly deviating from the engaging position with the engaging tooth 28A outward in the axial direction.
- the protruding height of the protruding flange 142 protruding from the mechanism-side flange portion 132 can be easily increased, and the pawl 29 can be engaged. It is possible to reliably prevent the shift from the engagement position with the tooth 28A to the outside in the axial direction. Further, even if a load is applied to the take-up drum 105 toward the axial direction pawl side, the protruding flange 142 protruding from the mechanism side flange portion 132 abuts against the engaging teeth 28A and receives the load, so the load applied to the pawl 29 is reduced.
- the pawl 29 can be provided only on the mechanism side flange portion 132 facing the engaging teeth 28A of the winding drum 105, and the number of parts can be reduced.
- each level difference part 143 projected to the axial direction outside from projection flange 142 can be made to contact with engagement tooth 28A.
- a gap is formed between the portion of the projecting flange 142 where the pawl 29 moves and the engaging tooth 28A, and the pawl 29 is engaged with the engaging tooth 28A. It can be made to project more toward the projecting flange 142 side, and the engagement between the pawl 29 and the engaging teeth 28A can be ensured.
- the shaft of the mechanism side flange portion 132 is Since the retaining flange 141 provided on the outer edge of the outer side faces the engaging tooth 28A adjacent to the inner side in the axial direction, the pawl 29 is largely shifted inward in the axial direction from the engaging position with the engaging tooth 28A. This can be reliably prevented.
- the mechanism side flange portion can be applied regardless of which axial load is applied from the webbing 3 to the take-up drum 105.
- the mechanism-side flange portion 132 is not easily affected by a decrease in rigidity of the housing 15, and the housing 15 can be easily reduced in weight.
- the through-hole 38 formed in the side wall portion 22 is opened in a substantially U shape by extending downward from the semicircular arc portion 36 and the lower end portions of the semicircular arc portion 36 slightly outward in the left-right direction. And an enlarged portion 37.
- the outer flange 147 of the drum 105 and the take-up spring side flange portion 133 are inclined to the downward direction, and continue to the portion where the semicircular arc portion 36 and the enlarged portion 37 of the through hole 38 formed in the side wall portion 22 are continuous. Can be inserted. Thereby, the winding drum unit 6 can be easily attached between the side wall portions 21 and 22 of the housing 15, and the efficiency of the assembling work can be improved.
- the winding spring side flange portion 133 is provided. Is opposed to the inner side surface of the semicircular arc-shaped portion 36 adjacent to the outside in the axial direction, so that the pawl 29 can be prevented from being largely displaced inward in the axial direction from the engagement position with the engagement teeth 28A.
- the winding drum 105 is prevented from rotating in the webbing pull-out direction, even if a load is applied from the webbing 3 to the winding drum 105 toward the axial pawl 29, the axial direction of the winding spring side flange portion 133 is increased. Since the outer flange 147 provided on the outer side faces the outer surface of the chevron 39 of the semicircular arc-shaped portion 36 adjacent to the inner side in the axial direction, the pawl 29 is greatly increased from the engagement position with the engagement teeth 28A to the outer side in the axial direction. Shifting can be prevented in an auxiliary manner.
- this invention is not limited to the said embodiment, Of course, various improvement and deformation
- transformation are possible within the range which does not deviate from the summary of this invention.
- the following may be used.
- the same reference numerals as those of the seat belt retractor 1 according to the embodiment in FIGS. 1 to 32 are the same as or equivalent to those of the seat belt retractor 1 according to the embodiment. Is shown.
- the stepped portion 143 provided on the side surface on the outer side in the axial direction of the projecting flange 142 is provided on only one side, not both sides, on the outer side in the circumferential direction from the opening portion on the pawl outlet side of the pawl housing recess 137. You may do it.
- the outer stepped portion 145 provided on the axially inner side surface of the retaining flange 141 is either on the outer side in the circumferential direction with respect to the opening portion on the pawl outlet side of the pawl receiving recess 137, but not on both sides. It may be provided only on one side.
- the stepped portion 143 and the outer stepped portion 145 are not opposed to each other even if they are provided on the same side so as to face each other in the portion on the outer side in the circumferential direction with respect to the opening portion on the pawl outlet side of the pawl housing recess 137. As such, they may be provided on different sides.
- the stepped portion 143 projecting outward in the axial direction from the projecting flange 142 or the outer stepped portion 145 projecting inward in the axial direction from the retaining flange 141 is removed. It can be brought into contact with the engaging teeth 28A. Therefore, no matter which side of the winding drum 105 is displaced in the axial direction, a gap is formed between the projecting flange 142 or the part of the pawl 29 of the retaining flange 141 where the pawl 29 moves and the engaging tooth 28A. 29 can protrude from the engaging tooth 28A toward the projecting flange 142 or the retaining flange 141, and the engagement between the pawl 29 and the engaging tooth 28A can be ensured.
- FIG. 33 is a perspective view of the winding drum 155.
- 34 is a cross-sectional view taken along arrow X7-X7 in FIG. 33 with the pawl 29 inserted.
- the winding drum 155 has substantially the same configuration as the winding drum 105.
- the difference is that a protruding flange 156 is provided instead of the protruding flange 142.
- the protruding flange 156 is formed in a straight line connecting the positions near the stepped portions 143 at the outer edge in the radial direction in order to reduce the weight of the winding drum 155. Further, the maximum outer dimension D8 formed by the protruding flange 156 and the mechanism side flange portion 132 is larger than the inner peripheral diameter D1 of the tip of the engagement tooth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21.
- both ends of the radially outer edge portion of the protruding flange 156 are adjacent to the outer side in the axial direction. It protrudes radially outward from the inner peripheral diameter D1 of the tip of the artificial tooth 28A.
- the maximum outer dimension D8 formed by the protruding flange 156 and the mechanism side flange portion 132 is larger than the inner peripheral diameter D1 of the tip of the engagement tooth 28 formed on the inner peripheral surface of the through hole 28 of the side wall portion 21. Is set to Thereby, even when the mechanism side flange portion 132 moves to the opposite side with respect to the pawl 29 due to the reaction force that the engaging claws 29A and the engaging teeth 28A of the pawl 29 lock, Both ends of the radially outer end edge of the projecting flange 156 can be opposed to the adjacent engaging teeth 28A, and the pawl 29 is reliably shifted from the engaging position with the engaging teeth 28A outward in the axial direction. Can be prevented.
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Abstract
Description
例えば、コの字形に形成されたフレーム2の左右側壁2a、2bに設けられた貫通孔2d、2eの内周面には、それぞれ全周に渡って山形状の歯2f、2gが形成されている。また、左右側壁2a、2b間にはウエビング3を巻き取るリールシャフト4が配設されている。
先ず、本実施形態に係るシートベルト用リトラクタ1の概略構成について図1乃至図3に基づき説明する。
図1は本実施形態に係るシートベルト用リトラクタ1の外観斜視図である。図2はシートベルト用リトラクタ1の分解斜視図である。図3は図1のX1-X1矢視の全断面図である。
メカニズムカバーユニット8は、巻取ドラムユニット6を構成するクラッチユニット9の外側を覆った状態でハウジングユニット5の外側に、一体に形成された各ナイラッチ8Aによって固設され、クラッチユニット9と協働してウエビング3の急激な引き出しや車両の急激な加速度の変化に反応してウエビング3の引き出しを停止するロック機構10を構成する。(図31参照)。
そして、終端部に抜け止めピン12が固定されたウエビング3が挿通されて巻装される巻取ドラムユニット6は、ハウジングユニット5に固設された巻取バネユニット7とメカニズムカバーユニット8との間に回転自在に支持される。
次に、ハウジングユニット5の概略構成について図2乃至図6に基づいて説明する。
図4は図1のX2-X2矢視の全断面図である。図5はハウジングのメカニズムカバーユニット8側の側面図である。図6はハウジングの巻取バネユニット7側の側面図である。
図2及び図3に示すように、ハウジングユニット5は、平面視コの字状のハウジング15と、ナイロン等の合成樹脂で形成されてウエビング3が引き出される平面視横長四角形の貫通孔16が形成された横長枠状のプロテクタ17とから構成されている。
次に、巻取バネユニット7の概略構成について図2乃至図4と図7に基づいて説明する。図7は巻取バネユニット7の分解斜視図である。
図2乃至図4と図7に示すように、巻取バネユニット7は、渦巻バネ45と、この渦巻バネ45の外側端45Aが内側周縁部の底面から立設されたリブ46に固定されると共にこの渦巻バネ45を収容するバネケース11と、渦巻バネ45の内側端45Bが連結されてバネ力が付勢されるバネシャフト47と、バネケース11に取り付けられて渦巻バネ45を覆うスプリングシート48とから構成されている。
次に、メカニズムカバーユニット8の概略構成について図2乃至図4と図8に基づいて説明する。図8はメカニズムカバーユニット8の分解斜視図である。
図2乃至図4と図8に示すように、メカニズムカバーユニット8は、ハウジング15の側壁部21の外側に各ナイラッチ8Aによってクラッチユニット9を覆うように取り付けられるメカニズムカバー58と、メカニズムカバー58のセンサー収容部59に収容される緊急ロック起動装置としての車両加速度センサ61とから構成されている。
また、センサー収容部59は、断面略四角形の凹形状に形成されて、両側壁部の奥側に形成された一対の係止孔72が形成されている。
ここで、車両加速度センサ61の概略構成を図8乃至図17に基づいて説明する。
図9は車両加速度センサ61の分解斜視図である。図10は図9のセンサーホルダ82を奥側から見た斜視図である。図11はセンサーレバー85のセンサーホルダ82への取り付け側から見た正面図である。図12は図11のX3ーX3矢視断面図である。図13乃至図17は、慣性質量体83の移動によって上下に揺動するセンサーレバー85の動作状態を説明する説明図である。
図13及び図16に示すように、慣性質量体83が載置部81の底部に静止している静止状態においては、センサーレバー85が自重によって下方へ回転して、当接レバー96の下端部が規制壁部97の内側面に当接して、当該センサーレバー85の下側方向への回転範囲が規制されている。また、カバー部98の下面側の碗状に窪む接触部98Aと慣性質量体83との相互間には所定距離の隙間102(例えば、距離約0.5mmの隙間である。)が形成されている。
従って、車両の加速度の変動が、慣性質量体83がセンサーレバー85の接触部98Aに接触しない変動範囲内の場合には、センサーレバー85が上下方向に揺動しても、センサーレバー85の接触部98Aと慣性質量体83との接触を防止することができる。
次に、巻取ドラムユニット6の概略構成について図2乃至図4、図18及び図19に基づいて説明する。図18は巻取ドラムユニット6の分解斜視図である。図19はクラッチユニット9の分解斜視図である。
図2乃至図4、図18及び図19に示すように、巻取ドラムユニット6は、ウエビング3が巻回される巻取ドラム105と、ハウジング15の側壁部21に形成された貫通孔28の係合歯28Aに係合するパウル29と、クラッチユニット9と、ベアリングキャップ71とから構成されている。また、クラッチユニット9は、ロッキングクラッチ106、ロックアーム63、センサースプリング107及びリターンスプリング108とから構成されている。
続いて、巻取ドラム105の概略構成について図3、図20乃至図24に基づいて説明する。図20は巻取ドラム105にパウル29を挿入した正面図である。図21は図20の左側面図である。図22は図20の右側面図である。図23は図20のX5-X5矢視断面図である。図24は図20のX6-X6矢視断面図である。
先ず、図25及び図26に示すように、巻取ドラム105のメカニズム側フランジ部132に形成された突出フランジ142の周方向略中央部が、鉛直方向上側に位置するように巻取ドラムユニット6のクラッチユニット9を把持する。
次に、ロック機構10の動作について図31及び図32に基づいて説明する。図31はロック機構10の動作説明図である。図32はパウル29が係合歯28Aに係合したロック状態を示す側面図である。
ロック機構10の動作には、ウエビング3の急激な引き出しによってウエビング3の引き出しを停止する「ウエビング感応式ロック機構」と、車両の急激な加速度の変化に反応してウエビング3の引き出しを停止する「車体感応式ロック機構」とがある。
先ず、「ウエビング感応式ロック機構」の動作について説明する。
図31及び図32に示すように、ロックアーム63はロッキングクラッチ106のピボット軸115によって回動自在に支持されているため、ウエビング3の引出加速度が所定加速度(例えば、約2.0Gである。尚、1G≒9.8m/s2とする。)を超えた場合には、ロッキングクラッチ106のウエビング引出方向(矢印151方向である。)への回転に対してロックアーム63に慣性遅れが生じる。
次に、「車体感応式ロック機構」の動作について説明する。
図31及び図32に示すように、車両加速度センサ61の球体状の慣性質量体83は、センサーホルダ82のすり鉢状の載置部81上に載置されているため、車両の衝突や急ブレーキ等によって車体の揺れや傾きなどによる急激な加速度が所定加速度(例えば、約0.4Gである。)を超えた場合には、載置部81上を移動して、センサーレバー85の接触部98Aに接触して上方へ押動する。
尚、以下の説明において上記図1乃至図32の前記実施形態に係るシートベルト用リトラクタ1の構成等と同一符号は、該前記実施形態に係るシートベルト用リトラクタ1の構成等と同一あるいは相当部分を示すものである。
図33及び図34に示すように、巻取ドラム155は、上記巻取ドラム105とほぼ同じ構成である。但し、突出フランジ142に替えて、突出フランジ156が設けられている点で異なっている。
Claims (7)
- ウエビングを巻回収納する巻取ドラムと、
相対向する一対の側壁部に前記巻取ドラムが挿通されて回転可能に取り付けられる貫通孔が形成されたハウジングと、
前記巻取ドラムと前記一対の側壁部のうちの一方の側壁部に形成された貫通孔との間に配設されて、通常時前記巻取ドラムのウエビング引出方向及びウエビング巻取方向の回動を許容し、必要時に作動して前記巻取ドラムのウエビング引出方向の回動を阻止するロック手段と、
を備え、
前記ロック手段は、
前記一方の側壁部に形成された貫通孔の内周面に設けられた係合歯と、
前記巻取ドラムのウエビング巻取部の軸方向両端にそれぞれ形成された一対のフランジ部のうち、前記係合歯に対向する係合側フランジ部に配設されて、通常時前記係合歯に係合しない非係合位置に位置し、必要時に前記係合歯に係合する係合位置に移動するパウルと、
を有し、
前記係合側フランジ部は、前記パウルと前記係合歯との係合部に対向する周縁部分から半径方向外側へ突出するように形成された突出部を有し、
該係合側フランジ部の外径が前記係合歯の先端の内周径よりも小さくなるように形成されると共に、前記突出部と該係合側フランジ部とのなす最大外形寸法が前記係合歯の先端の内周径よりも大きくなるように形成され、
前記一方の側壁部に形成された貫通孔の中心軸と前記巻取ドラムの回転軸とが一致した状態で、前記突出部が軸方向外側に隣接する前記係合歯の先端の内周径よりも半径方向外側に突出することを特徴とするシートベルト用リトラクタ。 - 前記突出部は、前記一方の側壁部に形成された貫通孔の中心軸と前記巻取ドラムの回転軸とが一致した状態で、前記係合歯の先端の内周径よりも半径方向外側に突出する部分を含む周方向両端縁部の少なくとも一方から軸方向外側へ前記パウルの厚さよりも低い高さで突設された段差部を有し、
前記パウルは、前記段差部に対して周方向内側を移動して前記係合位置へ移動することを特徴とする請求項1に記載のシートベルト用リトラクタ。 - 前記係合側フランジ部は、前記突出部よりも軸方向外側の周縁部から半径方向外側へ延出された鍔部を有し、
前記鍔部は、前記一方の側壁部に形成された貫通孔の中心軸と前記巻取ドラムの回転軸とが一致した状態で、前記係合歯よりも軸方向外側に位置すると共に、該係合歯の先端の内周径よりも半径方向外側に突出することを特徴とする請求項1又は請求項2に記載のシートベルト用リトラクタ。 - 前記鍔部は、軸方向内側面の前記パウルと前記係合歯との係合部の周方向両端部に対向する少なくとも一方の部分から軸方向内側へ前記パウルの厚さよりも低い高さで突設された外側段差部を有し、
前記パウルは、前記外側段差部に対して周方向内側を移動して前記係合位置へ移動することを特徴とする請求項3に記載のシートベルト用リトラクタ。 - 前記一方の側壁部に対向する他方の側壁部に形成された貫通孔は、
ウエビング引出方向側が半円弧状に開設された半円弧状部と、
前記半円弧状部に連続して該他方の側壁部の端縁側へU字状に開設された拡大部と、
を有し、
前記拡大部は、前記巻取ドラムを傾けて前記一方の側壁部に形成された貫通孔内へ前記突出部を通過させる際に、前記一対のフランジ部のうち、前記他方の側壁部に形成された貫通孔に対向する他側フランジ部が干渉しないように形成されていることを特徴とする請求項1乃至請求項4のいずれかに記載のシートベルト用リトラクタ。 - 前記半円弧状部は、前記一方の側壁部に形成された貫通孔の中心軸と前記巻取ドラムの回転軸とが一致した状態で、前記他側フランジ部が軸方向外側に隣接する該半円弧状部の内周面よりも半径方向外側に突出するように形成されていることを特徴とする請求項5に記載のシートベルト用リトラクタ。
- 前記他側フランジ部は、前記一方の側壁部に形成された貫通孔の中心軸と前記巻取ドラムの回転軸とが一致した状態で、前記半円弧状部を挟んで相対向するように設けられた他側鍔部を有し、
前記他側鍔部は、前記一方の側壁部に形成された貫通孔の中心軸と前記巻取ドラムの回転軸とが一致した状態で、該半円弧状部の内周面よりも半径方向外側に突出するように形成されていることを特徴とする請求項6に記載のシートベルト用リトラクタ。
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JP5753736B2 (ja) | 2015-07-22 |
US20140117138A1 (en) | 2014-05-01 |
EP2719583B1 (en) | 2016-10-12 |
KR101489825B1 (ko) | 2015-02-06 |
EP2719583A1 (en) | 2014-04-16 |
EP2719583A4 (en) | 2014-12-03 |
US9771051B2 (en) | 2017-09-26 |
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