WO2018198829A1 - Enrouleur automatique pour ceinture de sécurité - Google Patents

Enrouleur automatique pour ceinture de sécurité Download PDF

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Publication number
WO2018198829A1
WO2018198829A1 PCT/JP2018/015537 JP2018015537W WO2018198829A1 WO 2018198829 A1 WO2018198829 A1 WO 2018198829A1 JP 2018015537 W JP2018015537 W JP 2018015537W WO 2018198829 A1 WO2018198829 A1 WO 2018198829A1
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WO
WIPO (PCT)
Prior art keywords
piston
pipe
webbing
spindle
load
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Application number
PCT/JP2018/015537
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English (en)
Japanese (ja)
Inventor
一寛 茂呂
松岡　弘樹
Original Assignee
オートリブ ディベロップメント エービー
一寛 茂呂
松岡　弘樹
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by オートリブ ディベロップメント エービー, 一寛 茂呂, 松岡　弘樹 filed Critical オートリブ ディベロップメント エービー
Priority to JP2019514390A priority Critical patent/JP6768149B2/ja
Publication of WO2018198829A1 publication Critical patent/WO2018198829A1/fr

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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
    • B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
    • 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

Definitions

  • the present invention relates to a seat belt retractor for winding and unwinding a webbing for restraining an occupant.
  • the seat belt device installed in the vehicle includes a retractor that winds and unwinds the webbing for restraining the passenger.
  • a retractor is known that includes a spindle that winds and unwinds a webbing by rotating, and a pretensioner that rotates the spindle in a webbing winding direction in a vehicle emergency (for example, Patent Document 1).
  • the pretensioner operates in the initial stage of vehicle emergency.
  • the pretensioner includes, for example, a rotating member such as a pinion that rotates integrally with a spindle, a pipe, a gas generator that is attached to one end of the pipe and generates gas in the event of a vehicle emergency, one piston and a plurality of pistons housed in the pipe Ball.
  • the piston moves in the pipe by the gas supplied from one end of the pipe in the event of a vehicle emergency.
  • the plurality of balls are pushed out one by one from the other end of the pipe by the moving piston, and by rotating the rotating member, a rotational force is applied to the spindle and the spindle is rotated in the webbing take-up direction.
  • Patent Document 1 describes a pretensioner in which an expanded portion is formed on the side of a ball that comes into contact with a force transmission member (ball) in a main body of a piston.
  • the expansion portion of the piston expands in the direction of the inner peripheral surface of the pipe when the piston presses the ball.
  • the sealing performance between the piston and the inner peripheral surface of the pipe is improved, and the pressure loss of the gas pressure is reduced.
  • the gas pressure can be more effectively applied to the piston.
  • Some retractors are equipped with a so-called load limiter that, after the pretensioner is actuated, when the webbing is pulled due to inertial movement of the occupant and the load exceeds a predetermined value, the webbing is unwound while absorbing energy.
  • the load limiter includes a twisted member such as a torsion bar.
  • the torsion bar is mounted in the spindle, extends along the axis center of the spindle, and one end portion in the axial direction is coupled to the spindle.
  • the tension of the webbing acts not only as a rotational force in the webbing unwinding direction on the torsion bar via the spindle, but also the pinion pushes the ball back into the pipe via the spindle, This also acts as a moving force that moves the piston toward the gas generator.
  • the torsion bar not only twists and deforms due to the pulling force of the webbing, but also the piston moves against the resistance force accompanying the movement in the pipe. That is, when the webbing is unwound, in addition to the load associated with the torsional deformation of the torsion bar, the load associated with the movement of the piston acts on the webbing (occupant), and these loads become the load limiter load.
  • the load acting on the webbing is stable after the pretensioner operation until the load limiter operation is completed, but a state of “re-lock” may occur.
  • “re-lock” will be described.
  • the piston is pushed by the gas pressure generated by the gas generator and the spindle is rotated by a ball or the like in contact with the piston.
  • the load limiter operates while the webbing is retracted (winded).
  • a phenomenon occurs in which the piston is returned.
  • Re-lock refers to a phenomenon in which the spindle is locked by the lock mechanism after the load on the webbing is once released after the primary lock (that is, after the primary lock is released).
  • the load change rate (N / ms) after the pretensioner operation is the difference between the maximum load change rate and the minimum change rate within 5 ms (the load on the webbing is momentarily lost)
  • the difference between the first and second locks is 1000 N / ms or more. That is, when re-locking occurs, the passenger is not restrained by webbing after the piston starts to move after the primary lock until re-locking, and the passenger restraining performance at the time of collision is reduced.
  • Patent Document 1 merely improves the sealing performance of the piston to the pipe and suppresses the pressure loss of the gas pressure, increases the load accompanying the movement of the piston, maintains the load limiter load, and re-locks. There is room for improvement in terms of preventing the occurrence of
  • the present invention provides a seatbelt retractor that prevents the occurrence of re-locking by preventing the phenomenon of the primary lock being released, and that can ensure higher safety for passengers in the event of a vehicle emergency.
  • the purpose is to do.
  • a typical configuration of a seatbelt retractor includes a spindle that rotates and unwinds a webbing by rotating, and a pretensioner that rotates the spindle in the webbing winding direction.
  • the pretensioner includes a pipe that includes a curved portion that extends along a predetermined path and is curved in the middle, and a predetermined gas that is accommodated in the pipe and supplied from one end of the pipe.
  • the piston is pushed by at least one ball and hits the inner wall of the curved portion. It passes through the curved portion while being deformed along.
  • the piston moves in the pipe by the gas pressure generated from the gas generator attached to one end of the pipe, for example, and a plurality of balls are moved to the other end of the pipe. Extrude from.
  • the plurality of extruded balls rotate a rotating member (such as a pinion) that rotates integrally with the spindle to rotate the spindle in the webbing take-up direction.
  • the load limiter is activated when the webbing is pulled due to the inertial movement of the occupant and the load exceeds a predetermined value. That is, the tensile force of the webbing acts as a rotational force in the webbing unwinding direction on a twisted member (such as a torsion bar) via the spindle. Also, the pinion pushes the ball back into the pipe via the spindle, and acts as a moving force that moves the piston toward the gas generator by the pushed back ball.
  • the torsion bar not only twists and deforms due to the tensile force of the webbing, but also the piston moves against the resistance force accompanying the movement in the pipe. That is, when the webbing is unwound, in addition to the load associated with the torsional deformation of the torsion bar, the load associated with the movement of the piston acts on the webbing (occupant), and these loads become the load limiter load.
  • the load limiter load becomes greater than the gas holding pressure after the primary lock, the primary lock is released, and immediately after that, the lock mechanism is activated and the spindle is locked (relock). If this re-lock occurs, the load acting on the webbing will fluctuate greatly between the time of the primary lock and the time of re-lock, and the occupant may move inadvertently, and the webbing will not be restrained. As a result, the occupant restraint performance at the time of collision is reduced.
  • the present invention employs a piston that moves while deforming along the inner wall of the bending portion when passing through the bending portion of the pipe.
  • a piston that moves while deforming along the inner wall of the bending portion when passing through the bending portion of the pipe.
  • the frictional force between the pipe inner wall and the piston can be increased, and the resistance force accompanying the movement in the pipe can be increased.
  • the movement of the piston after the pretensioner operation is limited, and the load acting on the webbing after the pretensioner operation is maintained in an increased state. Can do.
  • the load limiter load is maintained to prevent the load from being released after the primary lock (ie, the release of the primary lock), thereby preventing the occurrence of re-locking and increasing the safety of passengers in the event of a vehicle emergency. It can be secured.
  • the length of the piston in the moving direction is preferably 1.4 times or more the inner diameter of the pipe. In this way, since the length of the piston in the moving direction is sufficiently longer than the inner diameter of the pipe, the bending resistance of the piston itself increases when passing through the curved portion of the pipe, and the contact area with the inner wall of the curved portion also increases. The friction force also increases because it becomes larger. For this reason, the load accompanying the movement of the piston can be reliably increased, the load limiter load can be maintained, and the occurrence of re-locking can be prevented.
  • the durometer hardness of the piston is preferably D scale 63 or higher. With such durometer hardness, the deformation of the piston during movement in the pipe is limited, the frictional force between the piston and the inner wall of the pipe can be increased, the load accompanying the movement of the piston is increased, The occurrence of re-locking can be prevented.
  • the bending strength of the above piston is preferably 350 MPa or more. With such bending strength, the deformation of the piston during movement in the pipe is limited, the frictional force between the piston and the inner wall of the pipe can be increased, the load accompanying the movement of the piston is increased, and the primary lock It is possible to prevent the subsequent load from coming off and prevent relocking.
  • the piston should have a breaking strength value in an Izod impact strength test at 23 ° C or -20 ° C. If the fracture strength value is measured in such an Izod impact strength test, the deformation of the piston during movement in the pipe is limited, and the frictional force between the piston and the pipe inner wall can be increased, By increasing the load accompanying the movement of the piston, it is possible to prevent the load from being lost after the primary lock, thereby preventing relocking.
  • the above piston includes a cylindrical main body, a through-hole penetrating the main body in the moving direction of the piston, a concave recess formed on the ball side of the main body, and a groove formed by cutting out the edge of the recess. It is good to have.
  • the recessed part is formed in the side which contacts a ball among the main bodies of a piston, a recessed part and a ball can contact reliably.
  • the gas on the gas generator side generated by the gas generator can move to the ball side through the through hole of the piston and further through the groove of the recess. For this reason, it can avoid that the gas pressure between a gas generator and a piston becomes high too much, and can prevent destruction of a pipe.
  • a seatbelt retractor that prevents the occurrence of re-locking by preventing the phenomenon that the primary lock is released, and that can ensure higher safety for the passenger in the event of a vehicle emergency.
  • FIG. 3 is an AA cross-sectional view of the seat belt retractor of FIG. 2.
  • It is a figure which illustrates the piston of the pretensioner of FIG. It is a figure which illustrates the state of the pretensioner after the load limiter operation
  • It is a figure which illustrates the other example of the piston of FIG. It is the graph which compared the webbing load of the embodiment of the present invention, and the change rate of webbing load. It is a graph which illustrates the relationship between the piston of an embodiment of the present invention, and re-locking.
  • SYMBOLS 100 Retractor for seat belts, 102 ... Seat belt device, 104 ... Vehicle seat, 106 ... Webbing, 108 ... Seat back, 110 ... Through anchor, 112 ... Tip of webbing, 114 ... Anchor plate, 116 ... Tongue plate, 118 ... Buckle, 120 ... Pretensioner, 122 ... Spindle, 124 ... Retractor frame, 126, 128 ... A pair of side plates of the retractor frame, 130 ... Torsion bar, 132 ... Tread head, 134 ... Pipe, 136, 136A ... Piston, 138 138a to 138i ... ball, 140 ... one end of pipe, 142 ...
  • gas generator 144 ... curved portion, 146 ... pinion, 148 ... cover member, 150 ... pocket, 152 ... other end of pipe, 154, 154A ... main body, 156 ... concave 158 ... edge, 160 ... groove portion, 162,162A ... end surface, 164,164A ... through hole, 166, 168 ... inner wall of the pipe, 170 ... recessed portion
  • FIG. 1 is a diagram illustrating a seat belt device 102 including a seat belt retractor (hereinafter referred to as a retractor 100) according to an embodiment of the present invention.
  • a retractor 100 a seat belt retractor
  • the retractor 100 is schematically illustrated.
  • the seat belt device 102 is a safety device installed on a vehicle seat 104 which is a left front seat (for example, a passenger seat) of the vehicle.
  • the seat belt device 102 restrains an occupant (not shown) to the vehicle seat 104 by using an occupant restraining webbing 106.
  • the retractor 100 is a device that winds and unwinds the webbing 106 by a rotational force, and is disposed in a center pillar that is not shown here. In the drawing, however, the retractor 100 is not limited to the center pillar, and may be disposed behind or inside the seat back 108 of the vehicle seat 104.
  • the webbing 106 is unwound from the retractor 100, inserted through a through anchor 110 attached to the upper part of the side of the passenger compartment, such as above the center pillar, and folded downward.
  • An anchor plate 114 attached to the lower side of the vehicle body is stitched to the front end portion 112 of the webbing 106 folded back by the through anchor 110.
  • the folded webbing 106 is inserted into the tongue plate 116.
  • a buckle 118 is disposed on the vehicle seat center side of the vehicle seat 104.
  • the occupant seated on the vehicle seat 104 grips the tongue plate 116 and attaches the tongue plate 116 to the buckle 118, whereby the body of the occupant is restrained by the webbing 106.
  • FIG. 2 is a diagram illustrating a cross section of the retractor 100 of FIG.
  • FIG. 3 is a cross-sectional view taken along the line AA of the retractor 100 of FIG.
  • FIGS. 3A and 3B illustrate the states before and after the operation of the pretensioner 120 of the retractor 100 in the event of a vehicle emergency.
  • the retractor 100 includes a spindle 122 that rotates and unwinds the webbing by rotating, and a pretensioner 120 that rotates the spindle 122 in the webbing winding direction in the event of a vehicle emergency.
  • the spindle 122 is rotatably supported by a pair of side plates 126 and 128 of the retractor frame 124.
  • a torsion bar 130 that is a torsion member is mounted in the spindle 122. As shown in FIG. 2, the torsion bar 130 extends along the axis of the spindle 122, one end in the axial direction is coupled to the spindle 122, and the other end is coupled to the tread head 132.
  • the torsion bar 130 is included in a load limiter mechanism (described later) that draws out the webbing while absorbing energy when a load greater than the setting is applied to the webbing.
  • the pretensioner 120 and a winding spring device are attached to the side plate 126 of the retractor frame 124.
  • the side plate 128 of the retractor frame 124 is provided with sensors such as vehicle acceleration detecting means and webbing unwinding acceleration detecting means (not shown) and locking means.
  • the lock means prevents the rotation of the webbing in the unwinding direction by engaging the tread head 132 with the retractor frame 124 in the event of a vehicle emergency.
  • the pretensioner 120 includes a pipe 134 that extends along a predetermined path, a cylindrical piston 136 that is accommodated in the pipe 134, and a plurality of balls 138 made of metal.
  • the pipe 134 is attached with a gas generator 142 that generates gas at the time of vehicle emergency at one end 140 thereof, and includes a curved portion 144 that is curved in the middle.
  • the piston 136 is disposed in the vicinity of the gas generator 142 attached to one end 140 of the pipe 134 before the operation of the pretensioner 120 shown in FIG.
  • the ball 138 a is disposed at a position closest to the piston 136.
  • the pretension 120 further includes a pinion 146 as a rotating member and a cover member 148 (see FIG. 2) that covers the pipe 134.
  • the pinion 146 is always coupled to the spindle 122 by spline fitting, and rotates together with the spindle 122.
  • a plurality of hemispherical pockets 150 for accommodating the balls 138 are provided on the outer periphery of the pinion 146 in the circumferential direction.
  • the cover member 148 restricts the shape of the pipe 134 by covering the pipe 134.
  • the balls 138b and 138c among the plurality of balls 138 are stored in the pockets 150 of the pinion 146 in advance.
  • the ball 138c is in contact with a ball 138d located near the other end 152 of the pipe 134. Further, the balls 138e to 138a following the ball 138d are accommodated in the pipe 134 in a state of being in contact with each other as shown in FIG.
  • the piston 136 When the gas generator 142 is activated and gas is supplied into the pipe 134 in the event of a vehicle emergency, the piston 136 is pressed by the pressure of the generated gas and moves in the pipe 134 as shown in FIG. To do.
  • the piston 136 shown in FIG. 3B moves to a position where the plurality of balls 138 are pushed out toward the other end 152 of the piston 136 while being in contact with the ball 138 a and passes through the curved portion 144 of the pipe 134.
  • the pretensioner 120 operates in the initial stage of the vehicle emergency, thereby removing the slack of the webbing and applying tension to the webbing so that the occupant can be reliably restrained.
  • FIG. 4 is a diagram illustrating the piston 136 of the pretensioner 120 of FIG.
  • FIG. 4A is a perspective view of the piston 136.
  • 4 (b) and 4 (c) are enlarged views of the piston 136 in the state shown in FIGS. 3 (a) and 3 (b).
  • the piston 136 has a cylindrical main body 154 as shown in FIG.
  • a recessed portion 156 is formed on the side of the main body 154 that is in contact with the ball 138a.
  • the recess 156 has a groove 160 formed by cutting out the edge 158.
  • the gas generator side facing the gas generator 142 in the main body 154 has a flat end surface 162.
  • the piston 136 has a through hole 164 through which the main body 154 passes. As shown in FIG. 4B, the through-hole 164 penetrates the main body 154 along the direction from the gas generator side of the main body 154 to the ball side or from the ball side to the gas generator side, that is, the moving direction of the piston 136. Yes.
  • the length La of the piston 136 in the moving direction is 14 mm
  • the inner diameter Lb of the pipe 134 is 10 mm. That is, the length La of the piston 136 in the moving direction is 1.4 times the inner diameter Lb of the pipe 134 and is sufficiently longer than the inner diameter Lb of the pipe 134. Further, as shown in FIG. 4B, the inner diameter of the piston 136 is slightly larger than the inner diameter Lb of the pipe 134.
  • the position of the piston 136 shown in FIG. 4 (c) is the position after the pretensioner operation shown in FIG. 3 (b).
  • the balls 138 f and 138 g among the plurality of balls 138 pushed out by the piston 136 are accommodated in the pocket 150 of the pinion 146.
  • the ball 138g is in contact with the ball 138h located near the other end 152 of the pipe 134.
  • the ball 138h is in contact with the subsequent ball 138i.
  • the ball 138 i is in contact with the ball 138 a that is in direct contact with the piston 136.
  • the balls 138a, 138f to 138i remain in the pretensioner 120.
  • the load limiter is activated.
  • FIG. 5 is a diagram illustrating the state of the pretensioner 120 after the load limiter operation subsequent to FIG. 3B.
  • the piston 136 is pushed (held) by the internal pressure of the gas generated by the gas generator 142.
  • the ball 138 is not easily returned to the gas generator 142 side by the gas pressure that presses the piston 136 and the frictional force between the piston 136 and the pipe 134, that is, “primary lock”.
  • the webbing tensile force acts on the torsion bar 130 (see FIG. 2) via the spindle 122 as a rotational force in the webbing unwinding direction (arrow C in the figure).
  • the tension of the webbing is such that the pinion 146 pushes the ball 138 (here, balls 138a, 138f to 138i) back into the pipe 134 via the spindle 122, and the piston 136 is moved to the gas generator side by the pushed back ball 138. Also acts as a moving force to move to.
  • the load acting on the webbing (occupant) is stable (primary lock) from after the pretensioner operation until after the load limiter operation is completed.
  • the load limiter load becomes greater than the gas holding pressure after the primary lock, the primary lock is released, and immediately after that, the lock mechanism is activated and the spindle is locked. This is called “re-lock”.
  • the difference between the maximum change speed and the minimum change speed in 5 ms is 1000 N / ms or more. May be.
  • the load acting on the webbing fluctuates greatly between the time after the primary lock and the time when re-locking is completed, and the occupant may move inadvertently and is not restrained by the webbing. It will be in a state and the passenger
  • the length 136 of the piston 136 in the moving direction is sufficiently longer than the inner diameter Lb of the pipe 134 as shown in FIG. 4B, and the inner diameter is slightly larger than the inner diameter Lb of the pipe.
  • the piston 136 receives a moving force by the pushed-back ball 138a and makes a large contact with the inner walls 166, 168 of the curved portion 144 of the pipe 134, as shown in FIG. While maintaining the area, it deforms in a state of being in close contact with the inner walls 166 and 168. Further, the piston 136 moves while being bent along the inner walls 166 and 168, passes through the curved portion 144 of the pipe 134, and is pushed back to the position shown in FIG. 5. Thereby, when the piston 136 moves through the pipe 134 from the position shown in FIG. 4C to the position shown in FIG.
  • the load accompanying the movement of the piston 136 in the pipe 134 can be increased, and the occurrence of re-locking can be achieved by holding the load limiter load and preventing the phenomenon that the primary lock is released. Can be prevented, and higher safety of the passengers in the event of a vehicle emergency can be ensured. Since the length of the piston 136 in the moving direction is long, the number of balls 138 is reduced to match the initial volume of the combustion chamber of the gas generator 142. Therefore, the cost is reduced by reducing the number of balls 138. You can also. Further, since the piston 136 can be changed in length with respect to the existing piston, no additional parts are required, and the piston 136 can be applied to various retractors. Further, since the length of the piston 136 is changed, it is easy to distinguish from the existing piston.
  • the concave portion 156 is formed on the ball side of the main body 154 of the piston 136, the concave portion 156 and the ball 138 can be reliably in contact with each other. Therefore, the ball 138 can prevent a large amount of gas from moving into the pipe 134 on the side where the ball 138 is present in a state where the piston 136 is pushed by the gas. On the other hand, part of the gas generated by the gas generator 142 can move to the ball side through the through hole 164 of the piston 136 and further through the groove 160 of the recess 156. Therefore, in the retractor 100, the gas pressure between the gas generator 142 and the piston 136 can be prevented from becoming too high, and the pipe 134 can be prevented from being broken.
  • FIG. 6 is a diagram illustrating another example of the piston 136 in FIG.
  • another example of the piston 136A is shown corresponding to the piston 136 shown in FIG.
  • the piston 136A has a length Lc in the moving direction (see FIG. 6B) shorter than the length La in the moving direction of the piston 136, and further changes the material.
  • the end face of the main body 154A on the gas generator side It differs from the piston 136 in that a recess 170 is formed in 162A.
  • the inner diameter of the piston 136A is slightly larger than the inner diameter Lb of the pipe 134.
  • the material of the piston 136A is selected based on the durometer hardness, bending strength, and isod impact strength from the viewpoint of preventing the occurrence of re-locking by increasing the load accompanying the movement of the piston 136A during the load limiter operation.
  • the durometer hardness is the surface hardness when the measurement condition is durometer
  • the test method is JIS K7125
  • the unit is D scale.
  • the isod impact strength is obtained by an isod impact strength test when the measurement condition is 23 ° C. or ⁇ 20 ° C.
  • the test method is ASTM D256
  • the unit is J / m notch.
  • the piston 136A receives a moving force by the pushed back ball 138a and deforms in a state of being in close contact with the inner walls 166, 168 of the bending portion 144 of the pipe 134, as shown in FIG. While moving along the inner walls 166, 168, it moves through the curved portion 144 of the pipe 134.
  • the piston 136A moves from the position shown in FIG. 6C through the pipe 134 and passes through the bending portion 144.
  • the piston 136A moves from the inner walls 166, 168 of the bending portion 144 with a large vertical drag Fa,
  • bending resistances Fc and Fd are also received. Therefore, by selecting a material that increases the bending resistances Fc and Fd as the material of the piston 136A, it is possible to increase the load accompanying the movement of the piston 136A when the load limiter is activated.
  • the material of the piston 136A has a durometer hardness of D scale 63 or more (see FIG. 8B) or a bending strength of 350 MPa or more, the load accompanying the movement of the piston 136A can be increased. The occurrence of re-locking can be prevented.
  • the material of the piston 136A may be any material as long as the fracture strength value is measured by an Izod impact strength test at 23 ° C. or ⁇ 20 ° C.
  • the material of the piston 136A is not limited to the breaking strength value, and any appropriate material may be selected as long as the measured value is observed (however, the material from which the measured value cannot be obtained is included in the present invention). Absent).
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  • the load accompanying the movement of the piston 136A is increased, The occurrence of locks can be prevented.
  • the piston 136A since the piston 136A is formed with the recess 170 on the gas generator side of the main body 154A, the gas pressure by the gas generator 142 can sufficiently act on the piston 136A. Since the through-hole 164A is formed in the main body 154A, it is possible to avoid the gas pressure between the gas generator 142 and the piston 136A from becoming too high (similar to the case of FIG. 5). Furthermore, since the piston 136A can be realized by changing the material with respect to the existing piston, an additional part or the like is not necessary and can be applied to various retractors.
  • FIG. 7 is a graph comparing the webbing load and the change rate of the webbing load between the embodiment of the present invention and the comparative example.
  • the horizontal axis is time (ms) and the vertical axis is webbing load (N).
  • the horizontal axis is time (ms)
  • the vertical axis is the webbing load change rate (N / ms).
  • this embodiment is indicated by a solid line and a comparative example is indicated by a dotted line.
  • pistons 136 and 136A are used.
  • a piston made of an existing material whose length in the moving direction of the piston is not increased is used.
  • FIGS. 7A and 7B show the change in webbing load and the change in change rate of the webbing load after the pretensioner operation in the vehicle emergency and after the load limiter operation is completed. Show.
  • the webbing load is stable between 5000 and 6000 (N) between 80 and 100 (ms).
  • the webbing load greatly changes from 4000 to 7000 (N).
  • the change rate of the webbing load in the comparative example exceeds 1000 (N / ms) and is lower than ⁇ 1000 (N / ms) as shown in the graph of FIG.
  • FIG. 8 is a graph illustrating the relationship between the pistons 136 and 136A and the relock according to the embodiment of this invention.
  • the horizontal axis is the length (mm) in the moving direction of the piston 136
  • the vertical axis is the webbing load change rate (N / ms).
  • the inner diameter of the pipe 134 through which the piston 136 moves is 10 mm.
  • the horizontal axis is durometer hardness (D scale)
  • the vertical axis is the webbing load change rate (N / ms).
  • Each graph shows a change in the change rate of the webbing load between the time after the pretensioner operation in the vehicle emergency and the time after the load limiter operation is completed.
  • the change rate of the webbing load is less than 1000 (N).
  • the change rate of the webbing load is around 3500 (N / ms), and exceeds 1000 (N / ms).
  • the length in the moving direction of the piston 136 is 14 mm or more, that is, 1.4 times the inner diameter of the pipe 134. If it is above, it can confirm that a re-lock does not generate
  • the change rate of the webbing load is less than 1000 (N).
  • the durometer hardness of the piston is less than 63 mm, here 47, 55, the change rate of the webbing load is around 3000 (N / ms) and exceeds 1000 (N / ms).
  • the length in the moving direction of the piston 136 is increased from the viewpoint of increasing the load accompanying the movement of the pistons 136 and 136A when the load limiter is operated, or the material of the piston 136A is increased.
  • the present invention can be used for a seat belt retractor for winding and unwinding a webbing for restraining an occupant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un enrouleur automatique pour une ceinture de sécurité, l'enrouleur empêchant le blocage en empêchant la libération d'une serrure primaire, et pouvant fournir une plus grande sécurité à un passager lors d'une urgence de véhicule. La solution selon l'invention porte sur un enrouleur automatique 100 qui est pourvu d'un pré-tendeur 120 qui fait tourner un axe 122. Le pré-tendeur comprend : un tuyau 134 ayant une partie incurvée 144 ; un piston cylindrique 136 qui est déplacé à l'intérieur du tuyau par un gaz fourni à partir d'une extrémité 140 du tuyau ; et une pluralité de billes 138 qui sont logées dans le tuyau et poussées hors de l'autre extrémité 152 du tuyau par le piston mobile, la pluralité de billes 138 faisant tourner la broche dans une direction d'enroulement de sangle. Au moins l'une de la pluralité de billes fait tourner la broche dans la direction d'enroulement de sangle, et est ensuite repoussée dans le tuyau par la broche qui tourne dans la direction d'enroulement de sangle lorsque le passager est retenu. Le piston est poussé par la bille et passe à travers la partie incurvée tout en se déformant le long des parois internes 166 et 168 de la partie incurvée.
PCT/JP2018/015537 2017-04-27 2018-04-13 Enrouleur automatique pour ceinture de sécurité WO2018198829A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10369963B2 (en) 2017-03-17 2019-08-06 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening
US11059452B2 (en) 2017-03-17 2021-07-13 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening

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* Cited by examiner, † Cited by third party
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JPS5779309A (en) * 1980-09-11 1982-05-18 Repa Feinstanzwerk Gmbh Driver
JP2003054363A (ja) * 2001-08-09 2003-02-26 Takata Corp プリテンショナ
JP2008273447A (ja) * 2007-05-01 2008-11-13 Autoliv Development Ab ウェビング巻取り装置
DE102008032371A1 (de) * 2008-03-06 2009-09-10 Trw Automotive Gmbh Gurtstraffer für ein Sicherheitsgurtsystem
JP2011126311A (ja) * 2009-12-15 2011-06-30 Takata Corp シートベルトリトラクタおよびこれを備えたシートベルト装置
US20120006925A1 (en) * 2010-07-06 2012-01-12 Jon Burrow High Seal Retractor Pretensioner Piston
JP2012116296A (ja) * 2010-11-30 2012-06-21 Takata Corp プリテンショナー、これを有するシートベルトリトラクタ、およびこれを備えたシートベルト装置
JP2013525189A (ja) * 2010-04-27 2013-06-20 オートリブ ディベロップメント エービー 安全ベルトのためのテンショナ装置
JP2016107915A (ja) * 2014-12-09 2016-06-20 株式会社東海理化電機製作所 ウェビング巻取装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5779309A (en) * 1980-09-11 1982-05-18 Repa Feinstanzwerk Gmbh Driver
JP2003054363A (ja) * 2001-08-09 2003-02-26 Takata Corp プリテンショナ
JP2008273447A (ja) * 2007-05-01 2008-11-13 Autoliv Development Ab ウェビング巻取り装置
DE102008032371A1 (de) * 2008-03-06 2009-09-10 Trw Automotive Gmbh Gurtstraffer für ein Sicherheitsgurtsystem
JP2011126311A (ja) * 2009-12-15 2011-06-30 Takata Corp シートベルトリトラクタおよびこれを備えたシートベルト装置
JP2013525189A (ja) * 2010-04-27 2013-06-20 オートリブ ディベロップメント エービー 安全ベルトのためのテンショナ装置
US20120006925A1 (en) * 2010-07-06 2012-01-12 Jon Burrow High Seal Retractor Pretensioner Piston
JP2012116296A (ja) * 2010-11-30 2012-06-21 Takata Corp プリテンショナー、これを有するシートベルトリトラクタ、およびこれを備えたシートベルト装置
JP2016107915A (ja) * 2014-12-09 2016-06-20 株式会社東海理化電機製作所 ウェビング巻取装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10369963B2 (en) 2017-03-17 2019-08-06 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening
US11059452B2 (en) 2017-03-17 2021-07-13 Autoliv Asp, Inc. Seatbelt pretensioning retractor assembly including a gas release opening

Also Published As

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JPWO2018198829A1 (ja) 2020-05-14

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