WO2010107075A1 - シートベルト装置 - Google Patents
シートベルト装置 Download PDFInfo
- Publication number
- WO2010107075A1 WO2010107075A1 PCT/JP2010/054605 JP2010054605W WO2010107075A1 WO 2010107075 A1 WO2010107075 A1 WO 2010107075A1 JP 2010054605 W JP2010054605 W JP 2010054605W WO 2010107075 A1 WO2010107075 A1 WO 2010107075A1
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- WO
- WIPO (PCT)
- Prior art keywords
- spindle
- pin
- lock member
- load
- seat belt
- Prior art date
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- 238000004804 winding Methods 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 7
- 229910001234 light alloy Inorganic materials 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 12
- 230000001133 acceleration Effects 0.000 description 8
- 238000005452 bending Methods 0.000 description 3
- 230000002542 deteriorative effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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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
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
- B60R22/4676—Reels with means to tension the belt in an emergency by forced winding up comprising energy-absorbing means operating between belt reel and retractor frame
-
- 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
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
- B60R2022/287—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material of torsion rods or tubes
-
- 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
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/288—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices with means to adjust or regulate the amount of energy to be absorbed
Definitions
- the present invention relates to a seat belt device, and more particularly, to a seat belt device provided with an energy absorbing mechanism that relieves a load that a passenger receives from a webbing during a vehicle collision.
- an emergency lock mechanism is provided that is driven by a sensor that reacts to sudden acceleration, collision or deceleration, and physically locks a webbing drawer, The passengers are restrained effectively and safely.
- pre-tensioners are used to improve the occupant's protection performance by removing the loose webbing in the event of a vehicle emergency due to a collision, etc., so that the occupant can be securely fixed before moving forward.
- gunpowder is used for the operation of the pretensioner, and the webbing is rapidly drawn by the force of gas generated when the gunpowder explodes.
- the webbing is allowed to be pulled out by a predetermined amount when the load acting on the webbing with the inertial movement of the occupant exceeds a predetermined value, thereby absorbing energy.
- An energy absorption mechanism that reduces the burden on the chest of the occupant is provided.
- a torsion bar As an energy absorption mechanism used in such a seat belt device, a torsion bar is generally widely used.
- the torsion bar is arranged coaxially with the spindle that winds up the webbing, one end is fixed to the spindle, and the other end is fixed to a lock member (a part called a tread head) of the emergency lock mechanism.
- a lock member a part called a tread head
- the spindle and the locking member of the emergency locking mechanism need to be connected so as to rotate integrally in the initial state. This is because, if the two are not connected so as to rotate together, the usability during normal webbing winding and pulling-out becomes worse, causing abnormal noise and rattling.
- a connecting means in this case for example, a pin is used.
- the load related to the pin thereafter becomes the energy absorption load (hereinafter referred to as EA) of the torsion bar.
- EA energy absorption load
- the present invention has been made in view of the above-described problems, and its purpose is to be able to firmly fix the spindle and the lock member during normal use, without adversely affecting usability,
- An object of the present invention is to provide a seat belt device in which a pin breaks with a low load at the time of a vehicle collision or the like so as not to affect the EA load.
- Retractor frame A spindle that is rotatably attached to the retractor frame, and a webbing is wound around the outer periphery;
- a locking member that is rotatable with respect to the retractor frame and lockable in an emergency,
- the spindle and the lock member are connected so as to rotate integrally in the initial state, and the spindle and the lock member can be rotated relative to each other by breaking when a predetermined relative rotational force acts between the spindle and the lock member.
- One end is fixed to the spindle and the other end is fixed to the lock member.
- the spindle is subjected to a rotational force in the webbing pull-out direction of a predetermined value or more in a state where the lock member is locked by the emergency lock means.
- a seat belt device comprising: The breaking load of the pin differs depending on the relative rotation direction of the lock member and the spindle, and the breaking load when the spindle tries to rotate relative to the lock member in the webbing pull-out direction is determined by the spindle.
- a seat belt device wherein the seat belt device is set to be larger than a breaking load when the relative rotation in the webbing take-up direction with respect to the lock member is attempted.
- the pin is integrally projected on one of the spindle or the lock member, and the pin is fitted into a hole formed on the other of the spindle or the lock member.
- the seat belt device according to (1) wherein the spindle and the lock member are connected by the pin so as to rotate integrally in an initial state.
- the pin is formed separately from the spindle and the lock member, and the pin is fitted into holes formed in the spindle and the lock member, respectively.
- the seat belt device according to (1), wherein the spindle and the lock member are coupled so as to rotate integrally in an initial state.
- the seat belt device according to (4), wherein the pin is made of any one of a high-strength resin, a light alloy, and a steel material.
- a part of the periphery of the base of the pin is provided with a notch for varying the breaking load of the pin due to a difference in relative rotation direction of the lock member and the spindle,
- the position of the base end of the pin opposite to the deep notch becomes the reference point for breakage, and the spindle is wound around the lock member by webbing.
- the base end position of the pin corresponding to the position of the bottom of the deep notch is set as a reference point for fracture when rotating in the take-off direction.
- a notch for making the breaking load of the pin different due to a difference in relative rotation direction of the lock member and the spindle is provided,
- the spindle tries to rotate in the webbing pull-out direction with respect to the lock member, the spindle is more than the distance from the working point at which the pressing force for breaking acts on the pin to the reference point for breaking. From the point (2), the distance from the point of action at which the pressing force for breaking acts on the pin to the reference point of breaking when rotating in the webbing take-up direction is longer ( 5)
- the seatbelt apparatus in any one of.
- a cushion portion for absorbing impact energy for changing the breaking load due to a difference in relative rotation direction of the lock member and the spindle is provided in a part of the circumferential direction of the pin, When the spindle rotates relative to the lock member in the webbing pull-out direction and a load of a predetermined level or more is applied to the pin, the cushion portion crushes to absorb a part of impact energy, and the spindle When the pin is subjected to a relative rotation in the webbing take-up direction with respect to the lock member, when a load exceeding a predetermined value is applied to the pin, the pin is broken by receiving the load on the side where the cushion portion is not provided.
- the seat belt device according to any one of (1) to (5), wherein the seat belt device is set.
- the breaking load of the pins differs depending on the relative rotation direction of the lock member and the spindle.
- the lock member is activated by the action of the webbing pull-out acceleration detecting means (WSI) to be in the locked state.
- WAI webbing pull-out acceleration detecting means
- the spindle does not lock at any time.
- the maximum static load stress is applied when the pin is pulled out.
- the pretensioner is activated during winding, the maximum impact force is applied.
- the breaking load of the pin is greater when the spindle tries to rotate relative to the lock member in the webbing pull-out direction than when the spindle tries to rotate relative to the lock member in the webbing take-up direction. Is set to be larger. Thereby, at the time of a pretensioner operation
- Rotating load in the pulling direction during normal use such as pulling out by an occupant, or rotating load in the pulling direction during sudden braking that does not activate the pretensioner does not cause pin breakage.
- the spindle When the pretensioner is activated in an emergency, the spindle rapidly rotates in the webbing take-up direction.
- the driving force of the pretensioner is very large and a large impact load is generated. Therefore, a pin that exerts a relatively small breaking load in that direction breaks during its operation, and the spindle and the lock member are joined by the pin. Is released.
- the spindle and the lock member are connected via a torsion bar. Actually, however, there is some backlash (gap, etc.) in each connecting part, and deformation corresponding to the twist angle in the elastic region of the torsion bar. As a result, the pin breaks.
- the emergency lock means is activated and the locking member is locked at the same time as the seat belt starts to be pulled out by the acceleration in the forward direction of the vehicle applied to the occupant.
- the rotational force in the webbing pull-out direction more than a predetermined value acts on the spindle and the energy absorbing mechanism absorbs impact energy, the load for breaking the pin does not ride as resistance. Therefore, even when the EA load (energy absorption load) is set low, the energy absorption performance in an emergency can be optimized without deteriorating the usability during normal use.
- the pin can be connected to the spindle and the lock member by protruding integrally with one of the spindle and the lock member and fitting into the hole formed on the other.
- the pin can be formed separately from the spindle and the lock member, and can be connected to the spindle and the lock member by being fitted in holes formed in the spindle and the lock member, respectively.
- the pin can be formed of any one of a high-strength resin, a light alloy, and a steel material.
- a notch is provided in a part around the base of the pin protruding from one of the spindle and the lock member. Is mentioned. Moreover, the same effect
- FIG. 1 It is a disassembled perspective view which shows the principal part of the seatbelt apparatus of 1st Embodiment of this invention.
- FIG. 1 it is a principal part sectional drawing of a seatbelt apparatus. The procedure for connecting the spindle and the tread head of the seat belt device with a pin integrated with the spindle is shown, (a) is a cross-sectional view showing a state in which the pin protrudes from the end surface of the spindle, (b) is the pin Sectional drawing which shows the state which fitted the hole of the tread head in (c), It is sectional drawing which shows the state which crimped the head of the pin and connected the spindle and the tread head.
- connection part by a pin is cut
- (a) is sectional drawing which shows that the notch is formed in the base end of a pin
- (b) is the difference in the rotation direction of a spindle It is sectional drawing which shows the effect
- (A) is a figure for demonstrating the fracture
- (b) is a fracture of a pin when a spindle tries to rotate in a webbing take-up direction. It is a figure for demonstrating.
- FIG. 4 shows a pin connecting portion when the pin is formed separately from the spindle and the tread head according to the seat belt device of the second embodiment, and FIG. 4A is cut along a plane along the same direction as FIG. Cross-sectional view, (b) is a cross-sectional view taken along the line Vb-Vb in (a), and (c) is a state in which the protrusions that are cushion portions are crushed by the load in the direction of arrow B in FIGS. It is sectional drawing shown.
- FIG. 6 shows a procedure when the spindle and the tread head are connected by the pin of FIG.
- FIG. 6 (a) is a sectional view showing a state in which a hole for fitting the pin is formed on the end surface of the spindle, and (b) is a hole of the tread head in the hole. Sectional drawing which shows the state which match
- FIG. 10 is a diagram illustrating a case where pins are formed separately from the spindle and the tread head according to the seat belt device of the third embodiment, where (a) is a cross-sectional view showing the configuration on the spindle side, and (b) is a tread head. It is sectional drawing which shows the state which inserted the pin in the hole of this, and the hole of the spindle, and crimped the head.
- the seat belt device 10 of the first embodiment is mounted on a retractor frame 11 attached to a vehicle body (not shown), is rotatably attached to the retractor frame 11, and a webbing is wound around the outer periphery.
- the seat belt device 10 takes up the spindle 12 in the winding direction (in the direction of arrow R in FIGS. 4 and 5) in order to wind up the webbing by a predetermined length in the emergency and before the emergency locking means 15 is activated.
- a pretensioner 18 that is rapidly rotated, and extends along the axial center of the spindle 12 and has one axial end fixed integrally with the spindle 12 and the other axial end.
- a torsion bar 13 fixed to the tread head 14. In the torsion bar 13, the tread head 14 is locked by the emergency locking means 15 during the emergency, and a rotational force in the webbing pull-out direction (arrow F direction in FIGS. 4 and 5) greater than a predetermined value is applied to the spindle 12.
- the torsional deformation acts as an energy absorbing mechanism that absorbs impact energy while allowing relative rotation between the spindle 12 and the tread head 14.
- a winding spring device (not shown), a cover 16 and the like for constantly urging the spindle 12 in the webbing winding direction are provided.
- the emergency lock means 15 is equipped with a sensor 15a for detecting an emergency of the vehicle, such as a vehicle acceleration detection means and a webbing pull-out acceleration detection means, in the cover 16, and the pawl 15b is moved by the movement of the sensor 15a to the retractor frame. 11, the tread head 14 is locked to the retractor frame 11.
- a sensor 15a for detecting an emergency of the vehicle such as a vehicle acceleration detection means and a webbing pull-out acceleration detection means
- a hexagonal hole 12a is provided at the end of the spindle 12 on the tread head 14 side, and a hexagonal nut 17 can be rotated integrally with the spindle 12 in the hexagonal hole 12a and is axial with respect to the spindle 12. It is housed in a slidable state.
- the male screw portion 14a of the tread head 14 is screwed to the hexagon nut 17 and the female screw to be screwed to the male screw portion 14a of the tread head 14 when the hexagon nut 17 rotates as the spindle 12 rotates.
- the hexagon nut 17 moves in the axial direction by the lead action of the portion 17a. Then, the hexagon nut 17 abuts against the inner stopper wall of the spindle 12, so that the spindle 12 is restricted from rotating with respect to the tread head 14.
- a plurality of pins 20 that connect the spindle 12 and the tread head 14 are provided at intervals in the circumferential direction of the spindle 12 (two in the illustrated example at intervals of 180 °).
- the pin 20 is integrally projected on the end surface of the spindle 12 formed as a die-cast molded product of a light alloy material such as an aluminum alloy, and the pin 20 is formed on the tread head 14.
- the spindle 12 and the tread head 14 are connected by the pin 20 so as to rotate integrally in the initial state by being fitted in the formed hole 22.
- the pin 20 protruding as shown in FIG. 3 (a) is inserted through the hole 22 of the tread head 14 as shown in FIG. 3 (b), and then the head is moved as shown in FIG. 3 (c).
- By hammering with the hammer 100 it is crimped to the opening step 22 a of the hole 22 of the tread head 14.
- the breaking load of the pin 20 is different depending on the relative rotation direction of the tread head 14 and the spindle 12. That is, when the spindle 12 attempts to rotate relative to the tread head 14 in the webbing pull-out direction, the pin 20 exerts a large breaking load, and the spindle 12 attempts to rotate relative to the tread head 14 in the webbing take-up direction. When doing so, the pin 20 is set to exhibit a small breaking load.
- the rupture load of the pin 20 is different on a part of the periphery of the base portion of the pin 20 due to the difference in the relative rotation direction of the tread head 14 and the spindle 12.
- a notch 28 is provided for the purpose.
- the following working difference occurs depending on the difference in the rotation direction of the spindle 12. That is, when the spindle 12 rotates in the webbing pull-out direction (arrow F direction) with respect to the tread head 14, the position of the proximal end of the pin 20 on the shallow notch side opposite to the deep notch 28 becomes the reference point for fracture. When the spindle 12 rotates in the webbing take-up direction (arrow R direction) with respect to the tread head 14, the position of the base end of the pin 20 corresponding to the position of the bottom of the deep notch 28 becomes the reference point for fracture. That is, the “breaking reference point” is a location of the main body of the spindle 12 which is regarded as a fulcrum of the moment of the force acting on the pin 20 by receiving the force acting on the pin 20 from the tread head 14.
- the spindle 12 is in the webbing pull-out direction.
- the pressing force indicated by arrow B in FIG. 4B acts at a distance b near the reference point.
- the pin 20 is fracture
- any means detects (or predicts) a vehicle collision
- the pretensioner 18 is activated, and the spindle 12 rapidly rotates in the webbing take-up direction (arrow R direction) to remove the slack of the webbing.
- the pin 20 that exhibits a small breaking load in that direction is broken at that time, and the spindle 12 is separated from the tread head 14.
- the breaking load of the pin 20 differs depending on the difference in the relative rotational direction between the tread head 14 and the spindle 12. Normally, when a sudden acceleration is applied to the spindle 12 in the pull-out direction, the tread head 14 is activated by the WSI to be locked. On the other hand, at the time of winding, the spindle 12 is not locked at any time. Looking at the load applied to the pin 20, the maximum static load stress is applied when the pin 20 is in the locked state. On the other hand, when the pretensioner is activated during winding, the maximum impact force is applied.
- the spindle 12 webs to the tread head 14. It is comprised so that it may become larger than the time of trying to rotate relatively in a winding direction (arrow R direction). Thereby, at the time of a pretensioner operation
- the pin 20 is not broken by a rotational load in the pulling direction during normal use such as a pulling-out operation by the occupant, or a rotating load in the pulling direction during sudden braking to the extent that the pretensioner 18 does not operate.
- the spindle 12 When the pretensioner 18 is activated in an emergency, the spindle 12 rapidly rotates in the webbing take-up direction. Since the driving force of the pretensioner 18 is very large and a large impact load is generated, the pin 20 that exhibits a relatively small breaking load in that direction is broken during the operation, and the spindle 12 and the tread head 14 are broken. The connection by the pin 20 is released.
- the spindle 12 and the tread head 14 are coupled to each other via a torsion bar 13. In practice, however, there is a slight backlash (gap or the like) at each coupling portion and the torsional bar in the elastic region of the torsion bar 13. Due to the deformation for the angle, the pin 20 is broken.
- the emergency lock means is activated and the tread head 14 is locked at the same time as the seat belt starts to be pulled out by the acceleration in the vehicle front direction applied to the occupant.
- the rotational force in the webbing pull-out direction of a predetermined value or more acts on the spindle 12 and the energy absorbing mechanism absorbs the impact energy, the load for breaking the pin 20 does not ride as a resistance. Therefore, even when the EA load (energy absorption load) is set low, the energy absorption performance in an emergency can be optimized without deteriorating the usability during normal use.
- the pin 20 is provided integrally on the spindle 12 side.
- the pin 20 is provided integrally on the tread head 14 side, and a hole for fitting the pin 20 is provided on the spindle 12 side.
- the spindle 12 and the tread head 14 may be connected by fitting the pin 20 into the hole.
- FIGSecond Embodiment 6 (a) to 7 (d) show the structure of the connecting portion of the pin 20B according to the seat belt device of the second embodiment of the present invention.
- the pin 20B is formed separately from the spindle 12 and the tread head 14. Then, the spindle 12 and the tread head 14 are connected by fitting the pins 20B into the holes 21 and 22 formed in the spindle 12 and the tread head 14, respectively.
- the pin 20B can be formed of any material of high strength resin, light alloy, and steel.
- a crush projection (cushion portion) 24 for absorbing impact energy is provided in a part of the circumferential direction of the pin 20B to vary the breaking load depending on the relative rotation direction of the tread head 14 and the spindle 12.
- this pin 20B when the spindle 12 rotates relative to the tread head 14 in the webbing pull-out direction (arrow F direction) and a load exceeding a predetermined value is applied to the pin 20B, as shown in FIG.
- the crushing protrusions 24 are crushed, a part of the impact energy is absorbed, and the spindle 12 rotates relative to the tread head 14 in the webbing winding direction (arrow R direction), so that a load exceeding a predetermined value is applied to the pin 20B.
- the pin 20B receives the load on the side where the crushing protrusion 24 is not present, the pin 20B is broken at a low load.
- an engagement uneven portion 27 for preventing rotation is provided on the outer periphery of the pin 20B (see FIG. 7D).
- FIGS. 8A and 8B show the structure of the connecting portion of the pin 20C according to the seat belt device of the second embodiment of the present invention.
- This pin 20C is also formed separately from the spindle 12 and the tread head 14, and an engaging uneven portion 27 for preventing rotation is provided on the outer periphery, as in the second embodiment.
- the spindle 12 is provided with a notch 26 for making the breaking load of the pin 20 different depending on the relative rotation direction of the tread head 14 and the spindle 12 in a part around the base of the pin 20C.
- the pin 20C exerts a large breaking load, and the spindle 12 is in the tread head 14
- the pin 20C is designed to exert a small breaking load. It can be ruptured by actuation and can not affect the EA load.
- the notches 28 and 26 are mainly provided in the spindle 12, but the notches may be provided in the pin 20 itself by appropriately calculating the breaking load. That is, the “periphery of the base of the pin 20” in the present invention means that not only the spindle portion around the base of the pin 20 but also the thickness and diameter of the pin 20 itself are in the middle of the longitudinal direction of the pin 20. As varied, it also includes the periphery of the pin 20 itself. The notch may be provided only on the spindle, only on the pin, or on both, as long as it is around the base of the pin 20.
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Abstract
Description
(1) リトラクタフレームと、
該リトラクタフレームに回転自在に取り付けられ、外周にウェビングが巻装されるスピンドルと、
前記リトラクタフレームに対して回転可能かつ緊急時にはロック可能なロック部材と、
前記スピンドルとロック部材を初期状態において一体回転するように連結し、前記スピンドルとロック部材間に所定の相対回転力が作用した際に自身が破断することで、前記スピンドルとロック部材を相対回転可能な状態に分離するピンと、
前記緊急時に前記ロック部材を前記リトラクタフレームに対してロックさせて前記スピンドルのウェビング引き出し方向への回転を阻止する緊急ロック手段と、
前記緊急時であって前記緊急ロック手段が作動する前に前記ウェビングを所定長さだけ巻き取るために前記スピンドルを巻き取り方向に回転させるプリテンショナと、
前記スピンドルに一端が固定されると共に他端が前記ロック部材に固定され、前記緊急時に前記ロック部材が前記緊急ロック手段によってロックされた状態で前記スピンドルに所定値以上のウェビング引き出し方向の回転力が作用したとき、前記スピンドルと前記ロック部材との相対回転を許容しながら衝撃エネルギを吸収するエネルギ吸収機構と、
を有するシートベルト装置であって、
前記ピンの破断荷重は、前記ロック部材とスピンドルの相対回転方向の違いにより異なっており、前記スピンドルが前記ロック部材に対してウェビング引き出し方向に相対回転しようするときの破断荷重が、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に相対回転しようとするときの破断荷重よりも大きくするように設定されていることを特徴とするシートベルト装置。
(2) 前記ピンが、前記スピンドルまたは前記ロック部材のうちの一方に一体に突設され、そのピンが、前記スピンドルまたは前記ロック部材のうちの他方に形成された孔に嵌合されることで、当該ピンによって、前記スピンドルとロック部材が初期状態において一体回転するように連結されていることを特徴とする上記(1)に記載のシートベルト装置。
(3) 前記スピンドルと前記ピンが、アルミニウム合金素材のダイキャスト成形品として一体に形成されていることを特徴とする上記(2)に記載のシートベルト装置。
(4) 前記ピンが、前記スピンドル及び前記ロック部材とは別体に形成され、該ピンが、前記スピンドル及び前記ロック部材にそれぞれ形成された孔に嵌合されることで、当該ピンによって、前記スピンドルとロック部材が初期状態において一体回転するように連結されていることを特徴とする上記(1)に記載のシートベルト装置。
(5) 前記ピンが、高強度樹脂、軽合金、及び鋼材のいずれかの材料で形成されていることを特徴とする上記(4)に記載のシートベルト装置。
(6) 前記ピンの基部の周囲の一部に、前記ロック部材とスピンドルの相対回転方向の違いにより前記ピンの破断荷重を異ならせるための切欠が設けられており、
前記スピンドルが前記ロック部材に対してウェビング引き出し方向に回転しようするときには、前記深い切欠と反対側の前記ピンの基端の位置が破断の基準点となり、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に回転しようするときには、前記深い切欠の底の位置に相当する前記ピンの基端の位置が破断の基準点となるように設定されていることを特徴とする上記(2)から(5)のいずれかに記載のシートベルト装置。
(7) 前記ピンの基部の周囲の一部に、前記ロック部材とスピンドルの相対回転方向の違いにより前記ピンの破断荷重を異ならせるための切欠が設けられており、
前記スピンドルが前記ロック部材に対してウェビング引き出し方向に回転しようするときの、前記ピンに破断のための押圧力が作用する作用点から破断の基準点までの距離よりも、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に回転しようするときの、前記ピンに破断のための押圧力が作用する作用点から破断の基準点までの距離の方が長いことを特徴とする(2)から(5)のいずれかに記載のシートベルト装置。
(8) 前記ピンの周方向の一部に、前記ロック部材とスピンドルの相対回転方向の違いにより破断荷重を異ならせるための衝撃エネルギ吸収用のクッション部が設けられており、
前記スピンドルが前記ロック部材に対してウェビング引き出し方向に相対回転することによって前記ピンに所定以上の荷重がかかったときに、前記クッション部が圧潰することで衝撃エネルギの一部を吸収し、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に相対回転することによって前記ピンに所定以上の荷重がかかったときに、前記クッション部が無い側で前記ピンがその荷重を受けることで破断するように設定されていることを特徴とする上記(1)から(5)のいずれかに記載のシートベルト装置。
図1及び図2に示すように、第1実施形態のシートベルト装置10は、車体(図示省略)に取り付けられるリトラクタフレーム11と、リトラクタフレーム11に回転自在に取り付けられ、外周にウェビングが巻装される略円筒状のスピンドル12と、リトラクタフレーム11に対して回転可能かつ緊急時にはロック可能なロック部材としてのトレッドヘッド14と、スピンドル12とトレッドヘッド14を初期状態において一体回転するように連結し、スピンドル12とトレッドヘッド14間に所定の相対回転力が作用した際に自身が破断することで、スピンドル12とトレッドヘッド14を相対回転可能な状態に分離するピン20と、緊急時にトレッドヘッド14をリトラクタフレーム11に対してロックさせてスピンドル12のウェビング引き出し方向(図4及び図5中の矢印F方向)への回転を阻止する緊急ロック手段15と、を備えている。
例えば、車両衝突を何らかの手段が検知(または予知)すると、最初にプリテンショナ18が作動し、スピンドル12がウェビング巻き取り方向(矢印R方向)に急速回転し、ウェビングの緩みを取り除く。その際、プリテンショナ18の駆動力は比較的大きいので、その方向に小さな破断荷重を発揮するピン20はその時点で破断し、トレッドヘッド14からスピンドル12が分離される。
図6(a)~図7(d)は、本発明の第2実施形態のシートベルト装置に係る、ピン20Bの連結部の構造を示す。ピン20Bは、スピンドル12及びトレッドヘッド14とは別体に形成される。そして、スピンドル12及びトレッドヘッド14にそれぞれ形成した孔21、22にそのピン20Bを嵌合させることにより、スピンドル12とトレッドヘッド14を連結する。ピン20Bをスピンドル12などと別体に形成した場合、ピン20Bを高強度樹脂、軽合金、及び鋼材のいずれかの任意の材料で形成することができる。
図8(a)及び(b)は、本発明の第2実施形態のシートベルト装置に係る、ピン20Cの連結部の構造を示す。このピン20Cも、スピンドル12及びトレッドヘッド14とは別体に形成されており、第2実施形態と同様、外周には回り止め用の係合凹凸部27を設けている。また、スピンドル12には、ピン20Cの基部の周囲の一部に、トレッドヘッド14とスピンドル12の相対回転方向の違いによりピン20の破断荷重を異ならせるための切欠26が設けられている。
例えば、切欠28,26は主にスピンドル12に設けられているが、破断荷重を適切に計算することでピン20自体に切欠が設けられてもよい。即ち、本発明の「ピン20の基部の周囲」とは、ピン20の根本付近周囲のスピンドル部分だけでなく、ピン20自体の太さ、径などが、ピン20の長手方向に対して途中で変わるように、ピン20自体の周囲も含む。当該切欠は、ピン20の基部の周囲であればスピンドルのみ設けられても、ピンのみに設けられてもよく、或いは、両方に設けられてもよい。
11 リトラクタフレーム
12 スピンドル
13 トーションバー(エネルギ吸収機構)
14 トレッドヘッド(ロック部材)
15 緊急ロック手段
18 プリテンショナ
20,20B,20C ピン
21,22 孔
26,28 切欠
Claims (8)
- リトラクタフレームと、
該リトラクタフレームに回転自在に取り付けられ、外周にウェビングが巻装されるスピンドルと、
前記リトラクタフレームに対して回転可能かつ緊急時にはロック可能なロック部材と、
前記スピンドルとロック部材を初期状態において一体回転するように連結し、前記スピンドルとロック部材間に所定の相対回転力が作用した際に自身が破断することで、前記スピンドルとロック部材を相対回転可能な状態に分離するピンと、
前記緊急時に前記ロック部材を前記リトラクタフレームに対してロックさせて前記スピンドルのウェビング引き出し方向への回転を阻止する緊急ロック手段と、
前記緊急時であって前記緊急ロック手段が作動する前に前記ウェビングを所定長さだけ巻き取るために前記スピンドルを巻き取り方向に回転させるプリテンショナと、
前記スピンドルに一端が固定されると共に他端が前記ロック部材に固定され、前記緊急時に前記ロック部材が前記緊急ロック手段によってロックされた状態で前記スピンドルに所定値以上のウェビング引き出し方向の回転力が作用したとき、前記スピンドルと前記ロック部材との相対回転を許容しながら衝撃エネルギを吸収するエネルギ吸収機構と、
を有するシートベルト装置であって、
前記ピンの破断荷重は、前記ロック部材とスピンドルの相対回転方向の違いにより異なっており、前記スピンドルが前記ロック部材に対してウェビング引き出し方向に相対回転しようするときの破断荷重が、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に相対回転しようとするときの破断荷重よりも大きくするように設定されていることを特徴とするシートベルト装置。 - 前記ピンが、前記スピンドルまたは前記ロック部材のうちの一方に一体に突設され、そのピンが、前記スピンドルまたは前記ロック部材のうちの他方に形成された孔に嵌合されることで、当該ピンによって、前記スピンドルとロック部材が初期状態において一体回転するように連結されていることを特徴とする請求項1に記載のシートベルト装置。
- 前記スピンドルと前記ピンが、アルミニウム合金素材のダイキャスト成形品として一体に形成されていることを特徴とする請求項2に記載のシートベルト装置。
- 前記ピンが、前記スピンドル及び前記ロック部材とは別体に形成され、該ピンが、前記スピンドル及び前記ロック部材にそれぞれ形成された孔に嵌合されることで、当該ピンによって、前記スピンドルとロック部材が初期状態において一体回転するように連結されていることを特徴とする請求項1に記載のシートベルト装置。
- 前記ピンが、高強度樹脂、軽合金、及び鋼材のいずれかの材料で形成されていることを特徴とする請求項4に記載のシートベルト装置。
- 前記ピンの基部の周囲の一部に、前記ロック部材とスピンドルの相対回転方向の違いにより前記ピンの破断荷重を異ならせるための切欠が設けられており、
前記スピンドルが前記ロック部材に対してウェビング引き出し方向に回転しようするときには、前記深い切欠と反対側の前記ピンの基端の位置が破断の基準点となり、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に回転しようするときには、前記深い切欠の底の位置に相当する前記ピンの基端の位置が破断の基準点となるように設定されていることを特徴とする請求項2から5のいずれか1項に記載のシートベルト装置。 - 前記ピンの基部の周囲の一部に、前記ロック部材とスピンドルの相対回転方向の違いにより前記ピンの破断荷重を異ならせるための切欠が設けられており、
前記スピンドルが前記ロック部材に対してウェビング引き出し方向に回転しようするときの、前記ピンに破断のための押圧力が作用する作用点から破断の基準点までの距離よりも、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に回転しようするときの、前記ピンに破断のための押圧力が作用する作用点から破断の基準点までの距離の方が長いことを特徴とする請求項2から5のいずれか1項に記載のシートベルト装置。 - 前記ピンの周方向の一部に、前記ロック部材とスピンドルの相対回転方向の違いにより破断荷重を異ならせるための衝撃エネルギ吸収用のクッション部が設けられており、
前記スピンドルが前記ロック部材に対してウェビング引き出し方向に相対回転することによって前記ピンに所定以上の荷重がかかったときに、前記クッション部が圧潰することで衝撃エネルギの一部を吸収し、前記スピンドルが前記ロック部材に対してウェビング巻き取り方向に相対回転することによって前記ピンに所定以上の荷重がかかったときに、前記クッション部が無い側で前記ピンがその荷重を受けることで破断するように設定されていることを特徴とする請求項1から5のいずれか1項に記載のシートベルト装置。
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JP2011504874A JP5560384B2 (ja) | 2009-03-18 | 2010-03-17 | シートベルト装置 |
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JP6074243B2 (ja) * | 2012-12-05 | 2017-02-01 | 芦森工業株式会社 | シートベルト用リトラクタ |
CN104742855A (zh) * | 2013-12-30 | 2015-07-01 | 常州博万达汽车安全设备有限公司 | 安全带连接装置 |
JP6393234B2 (ja) * | 2015-05-15 | 2018-09-19 | 株式会社ニフコ | ダンパー |
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DE102018106664B4 (de) | 2018-03-02 | 2022-05-05 | Autoliv Development Ab | Selbstsperrender Gurtaufroller für eine Sicherheitsgurteinrichtung eines Kraftfahrzeuges |
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US20120006928A1 (en) | 2012-01-12 |
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CN102341279A (zh) | 2012-02-01 |
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