JP4885764B2 - Webbing take-up device - Google Patents

Description

  The present invention relates to a webbing take-up device that restricts a load applied to an occupant from a webbing by a force limiter mechanism in a vehicle emergency.

  In the webbing take-up device, the torsion shaft limits the load acting on the occupant from the webbing belt to the limit load, and the limit load by the torsion shaft is increased by switching between engagement and non-engagement of the lock pawl with the ratchet wheel. Some can be switched between a load and a low load (see, for example, Patent Document 1).

  However, in this webbing take-up device, when the piston is driven and the cam plate is rotated, the lock pawl is rotated, and the engagement of the lock pawl to the ratchet wheel and the non-engagement are switched. For this reason, the cam plate and the lock pawl are interposed between the piston and the ratchet wheel, and the number of parts is large and the structure is complicated.

  A plurality of ratchet teeth are formed on the lock pawl, and the lock pawl meshes with the ratchet wheel at a plurality of locations. For this reason, the positioning of the lock pawl with respect to the ratchet wheel may be complicated.

  Further, the lock pawl support position (guide pin position) is arranged on the opposite side of the rotation direction of the ratchet wheel in the pull-out direction as compared with the engagement position of the lock pawl with the ratchet wheel. For this reason, in order for the lock pawl to mesh with the ratchet wheel and prevent the ratchet wheel from rotating in the pull-out direction, the lock pawl ratchet teeth are inclined to the opposite side of the ratchet wheel pull-out direction. It needs to be shaped. This may complicate the shape of the ratchet tooth portion of the lock pawl.

Further, when the engagement of the lock pawl with the ratchet wheel is released by driving the piston, it is preferable that the lock pawl can be prevented from being engaged with the ratchet wheel.
JP 2005-1648 A

  The present invention takes into account the above facts, a webbing take-up device that can simplify the structure, a webbing take-up device that can easily align the operating member with the moving member, a webbing take-up device that can simplify the shape of the operating member, And it is an object to obtain a webbing take-up device capable of suppressing the operation member from being inactivated when the operation member is operated.

A webbing take-up device according to claim 1, wherein a webbing that can be attached to a vehicle occupant is taken up and rotated in a drawing direction to draw out the webbing, a first deforming part, The second deforming portion has a torsion shaft provided at different axial positions, and allows the rotation of the take-up shaft in the pull-out direction in the event of a vehicle emergency to limit the load acting on the occupant from the webbing A force limiter mechanism that restricts to a driving force, a driving member that can be driven in an emergency of a vehicle, an actuating member that is directly actuated by driving of the driving member, and the actuating member is engaged and moved by actuation of the actuating member includes a movable member that is allowed, the low load by the first deforming portion of the limited load from high load by the first deformation portion and the second deforming portion by movement of the movable member is permitted And a, a switching means for switching to.

A webbing take-up device according to claim 2, wherein a webbing that can be attached to an occupant of a vehicle is taken up, and the webbing is taken out by being rotated in a drawing direction, a first deforming part, The second deforming portion has a torsion shaft provided at different axial positions, and allows the rotation of the take-up shaft in the pull-out direction in the event of a vehicle emergency to limit the load acting on the occupant from the webbing A force limiter mechanism that restricts to a driving force, a driving member that can be driven in an emergency of a vehicle, and a moving member that is engaged with the driving member and allowed to move by driving the driving member. Switching means for switching the limit load from a high load by the first deforming portion and the second deforming portion to a low load by the first deforming portion when the movement of the first deforming portion is permitted.

A webbing take-up device according to claim 3 is provided, wherein a webbing that can be attached to a vehicle occupant is taken up and rotated in a drawing direction to draw out the webbing, a first deforming part, The second deforming portion has a torsion shaft provided at different axial positions, and allows the rotation of the take-up shaft in the pull-out direction in the event of a vehicle emergency to limit the load acting on the occupant from the webbing A force limiter mechanism that restricts to an active member, an actuating member that can be actuated in an emergency of a vehicle, and a moving member that can be engaged with the actuating member at one location and can be switched between blocking and allowing movement by actuation of the actuating member When the has, by the operation and non-operation the said limit load by switching the first deformation portion and the high load and the first deformation portion according to a second modification of the actuating member into a low load And switching means for changing Ri, and a.

A webbing take-up device according to claim 4 is provided, wherein a webbing that can be attached to a vehicle occupant is taken up and rotated in a drawing direction to draw out the webbing, a first deforming part, The second deforming portion has a torsion shaft provided at different axial positions, and allows the rotation of the take-up shaft in the pull-out direction in the event of a vehicle emergency to limit the load acting on the occupant from the webbing A force limiter mechanism that restricts to an operating force, an actuating member that can be actuated via a fluid pressure in an emergency of a vehicle and that is kept in an actuated state via the fluid pressure, and the movement of the actuating member prevents movement And a movable member that can be switched, and switching the operation member between operation and non-operation, thereby restricting the limit load to a high load by the first deformation unit and the second deformation unit and And a, a switching means for switching into a low load by the first modified portion.

  In the webbing take-up device according to claim 1, the webbing that can be mounted on the vehicle occupant is taken up by the take-up shaft, and the webbing is drawn out by rotating the take-up shaft in the pull-out direction. .

  In an emergency of the vehicle, the force limiter mechanism allows the winding shaft to rotate in the pull-out direction, and the load acting on the occupant from the webbing is limited to the limit load.

  Further, in the switching means, the driving member can be driven in the event of an emergency of the vehicle, and the operating member is actuated by driving the driving member and the movement of the moving member is permitted, so that the limit load by the force limiter mechanism is allowed. Is switched from high load to low load.

  Here, the actuating member is directly actuated by driving of the driving member, and the actuating member is engaged with the moving member. For this reason, since only the operation member is interposed between the driving member and the moving member, the number of parts can be reduced and the structure can be simplified.

  In the webbing take-up device according to claim 2, the webbing that can be attached to the vehicle occupant is taken up by the take-up shaft, and the webbing is drawn out by rotating the take-up shaft in the pull-out direction. .

  In an emergency of the vehicle, the force limiter mechanism allows the winding shaft to rotate in the pull-out direction, and the load acting on the occupant from the webbing is limited to the limit load.

  Further, in the switching means, the driving member can be driven in an emergency of the vehicle, and the movement of the moving member is permitted by the driving of the driving member, so that the limit load by the force limiter mechanism is changed from a high load to a low load. Can be switched.

  Here, the driving member is engaged with the moving member. For this reason, since the structure is such that nothing is interposed between the driving member and the moving member, the number of parts can be reduced and the structure can be simplified.

  In the webbing take-up device according to claim 3, the webbing that can be mounted on the vehicle occupant is taken up by the take-up shaft, and the webbing is drawn out by rotating the take-up shaft in the pull-out direction. .

  In an emergency of the vehicle, the force limiter mechanism allows the winding shaft to rotate in the pull-out direction, and the load acting on the occupant from the webbing is limited to the limit load.

  Further, in the switching means, the operating member can be operated in the event of an emergency of the vehicle, and the movement of the moving member is switched between blocking and allowing by the operation of the operating member, so that the limit load by the force limiter mechanism is high. And low load.

  Here, the operating member can be engaged with the moving member at one location. For this reason, position alignment with respect to the moving member of an operation member can be simplified.

In the webbing take-up device according to claim 4 , the webbing that can be mounted on the vehicle occupant is wound around the take-up shaft, and the webbing is drawn out by rotating the take-up shaft in the pull-out direction. .

  In an emergency of the vehicle, the force limiter mechanism allows the winding shaft to rotate in the pull-out direction, and the load acting on the occupant from the webbing is limited to the limit load.

  Further, in the switching means, the operating member can be operated in the event of an emergency of the vehicle, and the movement of the moving member is switched between blocking and allowing by the operation of the operating member, so that the limit load by the force limiter mechanism is high. And low load.

  Here, the actuating member is operable via the fluid pressure, and when the actuating member is actuated, the operating state of the actuating member is maintained via the fluid pressure. For this reason, it can suppress that an operation member will be in a non-operation state.

<First Embodiment>
Next, a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is a sectional view schematically showing the configuration of the webbing take-up device 10 according to the first embodiment of the present invention.

  As shown in this figure, the webbing take-up device 10 includes a frame 12. The frame 12 includes a plate-like back plate 14 that is fixed to the vehicle body. A leg plate 16 extends substantially perpendicularly to the back plate 14 from one end in the width direction of the back plate 14. On the other hand, a leg plate 18 extends from the other end in the width direction of the back plate 14 in the same direction as the extending direction of the leg plate 16, and the frame 12 has a substantially concave shape in plan view.

  A spool 20 as a winding shaft is provided between the leg plate 16 and the leg plate 18. The spool 20 has an axial direction along the opposing direction of the leg plate 16 and the leg plate 18, and a base end portion of a long belt-like webbing belt 22 (seat belt) as a webbing is provided at an intermediate portion in the axial direction. It is locked. The spool 20 is wound in the winding direction (in the direction of arrow A in FIG. 2) which is one of its axes, so that the webbing belt 22 is wound and stored from the base end side, and the other is the drawer around the axis. The webbing belt 22 is pulled out by being rotated in the direction (the direction of arrow B in FIG. 2).

  On the other hand, the spool 20 is hollow along its central axis, and a force limiter mechanism and a torsion shaft 24 as a first energy absorbing member are accommodated inside thereof. The torsion shaft 24 includes a spool side coupling portion 26. The spool side coupling portion 26 is located between both axial ends of the spool 20, and the torsion shaft 24 is integrally connected to the spool 20 at the spool side coupling portion 26.

  A rod-shaped first deformable portion 28 is formed continuously from the end surface of the spool side coupling portion 26 on the leg plate 16 side. A first coupling portion 30 is formed coaxially and integrally with the first deformation portion 28 at the distal end side of the first deformation portion 28, and rotates to constitute a first lock mechanism 32 as a first lock means. A first coupling portion 30 is coaxially and integrally connected to a first lock base 34 as a body.

  The first lock base 34 is fitted from the end of the spool 20 on the leg plate 16 side so as to be coaxially rotatable relative to the spool 20. However, as described above, the first coupling portion 30 is integrally connected to the first lock base 34, so that the first lock base 34 is basically coaxial and integral with the spool 20. Connected.

  A first lock pawl 36 is provided on the radially outer side of the first lock base 34. The first lock pawl 36 is rotatably supported by the leg plate 16, and when the first lock pawl 36 rotates in a predetermined direction, the ratchet teeth formed on the first lock pawl 36 approach the outer periphery of the first lock base 34. Thus, the ratchet teeth formed on the outer peripheral portion of the first lock base 34 can be engaged with each other.

  On the other hand, a rotary member 38 is provided on the opposite side of the spool 20 via the first lock base 34 so as to be rotatable relative to the first lock base 34 in a coaxial manner. It is configured to follow and rotate with respect to the first lock base 34 by a biasing force of a biasing means (not shown) such as a coil spring.

  Although not shown in detail, the first lock mechanism 32 is provided with one or a plurality of restricting means for restricting the rotation of the rotating member 38. The first lock mechanism 32 is large when the vehicle is suddenly decelerated (emergency). When inertia occurs or when the first lock base 34 suddenly rotates in the pull-out direction, this restricting means is activated, and the rotation of the rotating member 38 is restricted. The first lock pawl 36 is a relative rotation between the first lock base 34 and the rotation member 38 that occurs when the first lock base 34 attempts to rotate in the pull-out direction while the rotation of the rotation member 38 is restricted. Interlocked with the outer periphery of the first lock base 34.

  On the other hand, a rod-shaped second deformable portion 40 is continuously formed from the end surface of the spool side coupling portion 26 on the leg plate 18 side. A second coupling portion 42 is formed coaxially and integrally with the second deformation portion 40 on the distal end side of the second deformation portion 40, and a second lock mechanism 44 as a switching means (second lock means). The second coupling part 42 is coaxially and integrally connected to the second lock base 46 constituting the above.

  The second lock base 46 is inserted from the end of the spool 20 on the leg plate 18 side so as to be coaxially rotatable relative to the spool 20. However, as described above, since the second coupling portion 42 is integrally connected to the second lock base 46, the second lock base 46 is basically coaxial and integral with the spool 20. Connected.

  As shown in FIGS. 1 and 2, the second lock base 46 is formed with a pair of pawl housing portions 48. These pawl housing portions 48 are open at a part of the outer periphery of the second lock base 46 and open at the end surface of the second lock base 46 opposite to the spool 20. A second lock pawl 50 is housed in these pawl housing portions 48. Each second lock pawl 50 is pivotally supported by a pawl support pin 52 formed in the pawl housing 48 so as to be rotatable about an axis parallel to the spool 20. Each of the second lock pawls 50 is basically housed in the pawl housing portion 48, but when the second lock pawl 50 rotates to one side around the pawl support pin 52, the distal end side of each second lock pawl 50 is the outer periphery of the pawl housing portion 48. Projecting outward from the opening in the part.

  On the other hand, a rotating disk 54 is provided on the opposite side of the spool 20 via the second lock base 46. The rotating disk 54 is pivotally supported on the spool 20 so as to be relatively rotatable coaxially with the spool 20. A pair of guide pins 56 project from the end face of the rotating disk 54 on the second lock base 46 side. These guide pins 56 are provided corresponding to the second lock pawl 50 described above.

  A long hole 58 is formed in each of the second lock pawls 50 corresponding to the guide pins 56, and the guide pin 56 enters the long hole 58. The long hole 58 has a width that is slightly larger than the outer diameter of the guide pin 56, and when the guide pin 56 rotates together with the rotating disk 54 to one side around the spool 20, the guide pin 56 moves along the inner wall of the long hole 58. The second lock pawl 50 is pressed to rotate around the pawl support pin 52.

  Further, a flat plate 60 projects from the end face of the rotating disk 54 on the second lock base 46 side. A rectangular spring accommodating hole 62 is formed in the second lock base 46 corresponding to the plate 60. A rotating disk biasing spring 64 is accommodated inside the spring accommodation hole 62.

  The rotating disk biasing spring 64 is a compression coil spring, one end of which is in pressure contact with the inner wall of the spring accommodating hole 62, and the other end is in pressure contact with the plate 60 that enters the inside of the spring accommodating hole 62. The rotating disk 54 can be rotated to one side around the spool 20 when the plate 60 receives the urging force of the rotating disk urging spring 64. When the rotating disk 54 is rotated in this direction, the guide pin 56 is moved to the first position. The two-lock pawl 50 is rotated to one side around the pawl support pin 52.

  On the other hand, as shown in FIGS. 5 and 6, a through hole 66 is formed at the bottom of the spring accommodation hole 62. A stopper accommodating hole 70 is formed in the spool 20 corresponding to the through hole 66. The stopper receiving hole 70 is parallel to the axis of the spool 20, one end opens at the end of the spool 20 on the first lock base 34 side, and the other end of the spool 20 on the second lock base 46 side. It opens at the end, and the inner diameter of the stopper accommodation hole 70 does not change from one end to the other end.

  Inside the stopper accommodating hole 70, a second energy absorbing member and a stopper wire 74 as a control means are accommodated. The stopper wire 74 is formed in a long rod shape along the axial direction of the spool 20, and one end side of the stopper wire 74 extends from the opening end of the stopper receiving hole 70 on the first lock base 34 side to the outside of the stopper receiving hole 70. Protruding.

  Further, at least one of the end portion of the spool 20 on the first lock base 34 side and the end portion of the first lock base 34 on the spool 20 side corresponding to the portion of the stopper wire 74 protruding from the spool 20 (this embodiment) In the embodiment, a wire guide groove 82 (see FIG. 7A) is formed in the end portion of the spool 20. The wire guide groove 82 is curved with the central axis of the spool 20 as the center of curvature, and one end side of the stopper wire 74 enters the inside of the wire guide groove 82 and is curved following the wire guide groove 82.

  Further, one end of the stopper wire 74 is bent toward the first lock base 34 in the wire guide groove 82 and enters the wire locking hole 84 formed in the first lock base 34 also shown in FIG. It is out.

  On the other hand, the other end of the stopper wire 74 protrudes from the end of the stopper receiving hole 70 on the second lock base 46 side to the outside of the spool 20. Further, the stopper wire 74 passes through the through-hole 66 and enters the inside of the spring accommodating hole 62 on the opposite side of the rotating disk biasing spring 64 via the plate 60 and rotates by the biasing force of the rotating disk biasing spring 64. The other end of the stopper wire 74 interferes with the plate 60 to be tried.

  As shown in FIGS. 1 and 2, a base 86 is integrally connected to the leg plate 18 outside the leg plate 18. A circular hole 88 is formed coaxially with the spool 20 in the base 86. The circular hole 88 has a sufficiently larger inner diameter than the second lock base 46, and the second lock base 46 passes through the circular hole 88. A lock ring 90 as a moving member is rotatably supported in the circular hole 88. The lock ring 90 is formed in a ring shape as a whole. Further, an inner ratchet 92 is formed on the inner peripheral portion of the lock ring 90, the second lock pawl 50 rotates to one side around the pawl support pin 52, and the distal end side of the second lock pawl 50 is the pawl housing portion 48. The second lock pawl ratchet 94 on the distal end side of the second lock pawl 50 meshes with the inner ratchet 92.

  Further, an outer peripheral groove 96 having a triangular cross section as an engaged portion is formed on a part of the outer periphery of the lock ring 90. A cam receiving hole 98 communicating with the circular hole 88 is formed in the base 86 corresponding to the outer peripheral groove 96. Inside the cam accommodation hole 98, a substantially rectangular plate-shaped cam 100 as an operating member is provided. The cam 100 is rotatably supported by a support shaft 102 that protrudes from the leg plate 18, and the support shaft 102 is disposed on the pulling direction side of the outer peripheral groove 96 of the lock ring 90. The cam 100 is configured such that a corner portion 100A on one end side as an engaging portion can be engaged with a winding-direction side surface 96A of the outer circumferential groove 96 of the lock ring 90. A rotational force in a direction away from the outer peripheral groove 96 of the lock ring 90 is applied. A shear pin 104 as a positioning means that protrudes from the leg plate 18 passes through the cam 100, thereby restricting the rotation of the cam 100, so that the corner portion 100 </ b> A of the cam 100 is an outer peripheral groove 96 of the lock ring 90. Is engaged (contacted) with the winding side surface 96A.

  When the corner portion 100A of the cam 100 is engaged with the winding direction side surface 96A of the outer circumferential groove 96 of the lock ring 90, when the lock ring 90 tries to rotate in the pull-out direction, the corner portion 100A of the cam 100 is moved to the lock ring 90. The outer circumferential groove 96 is pressed in the pull-out direction by the winding direction side surface 96A, and a rotational force acts in a direction in which the corner portion 100A is separated from the outer circumferential groove 96 of the lock ring 90 on the cam 100. By being regulated by the shear pin 104, the shear pin 104 receives the rotational force in the pull-out direction of the lock ring 90, and the rotation of the lock ring 90 in the pull-out direction is restricted (blocked).

  A cylinder housing hole 106 is formed in the base 86 below the cam 100. The cylinder accommodation hole 106 communicates with the cam accommodation hole 98, and a cylindrical cylinder 108 is fixed on the inside thereof. A piston 110 as a drive member is accommodated in the upper end portion of the cylinder 108, and the upper end of the piston 110 projects into the cam accommodation hole 98.

  A gas generator 112 (micro gas generator) as driving means is fixed to the lower end portion of the cylinder 108, and the gas generator 112 is disposed inside a generator housing hole 114 formed in the base 86, It is fixed to the base 86. Inside the gas generator 112, a chemical such as an igniting agent and a gas generating agent, and an ignition device that ignites the igniting agent when an electric ignition signal is input are accommodated. The ignition device of the gas generator 112 is connected to an ECU (control device) (not shown).

  In addition to the acceleration sensor that detects the sudden deceleration state of the vehicle, the ECU has suddenly decelerated the vehicle, such as a distance measuring sensor that detects that the distance to the obstacle in front of the vehicle is less than a certain value. And a danger prediction means for directly or indirectly detecting that the vehicle is about to suddenly decelerate, a load sensor for detecting a load acting on the seat of the vehicle, and the webbing belt 22 is pulled out by a certain amount from the spool 20. It is directly or indirectly connected to both physique detection means for directly or indirectly detecting the physique of the occupant seated on the seat, such as a belt sensor for detecting the fact.

  Based on a signal from the danger prediction means, the ECU determines that the vehicle is suddenly decelerated or that the vehicle is likely to decelerate, and the physique of the occupant seated in the seat is predetermined. When it is determined that the value is less than the value, an ignition signal is output from the ECU to the ignition device of the gas generator 112, and the gas generator 112 is operated.

  When an ignition signal is input to the ignition device of the gas generator 112, the igniting agent is ignited. Further, when the ignited ignition agent burns the gas generating agent, gas (fluid) is instantaneously generated inside the gas generator 112. appear. The pressure of the gas acts to push (drive) the piston 110 upward through the cylinder 108, and the piston 110 pushed upward of the cylinder 108 presses the other end side portion of the cam 100 upward. As the cam 100 breaks the shear pin 104, the cam 100 is rotated (actuated) in the direction of separating the corner portion 100A from the outer circumferential groove 96 of the lock ring 90.

  The base 86 is covered with a resin cover (not shown) as a covering member on the side opposite to the leg plate 18, and the second lock mechanism 44 is accommodated inside the cover.

  Next, the operation and effect of the present embodiment will be described.

(Operation of the first lock mechanism 32)
When the webbing belt 22 pulled out from the spool 20 is attached to the body of a vehicle occupant, for example, when the vehicle is suddenly decelerated and the first lock mechanism 32 is activated, The rotation of the rotating member 38 in the drawing direction is restricted.

  Next, when an occupant's body, which intends to move forward due to inertia at the time of sudden deceleration of the vehicle, tries to rotate the spool 20 in the pull-out direction by suddenly pulling the webbing belt 22, it is integrated with the spool 20 via the torsion shaft 24. The first lock bases 34 connected to each other rotate in the pull-out direction.

  Here, in this state, when the rotation of the rotation member 38 in the pull-out direction is restricted as described above, relative rotation occurs between the first lock base 34 and the rotation member 38, and the first lock pawl 36. Approaches the first lock base 34.

  As a result, the ratchet teeth of the first lock pawl 36 mesh with the ratchet teeth of the first lock base 34, and the rotation of the first lock base 34 in the pull-out direction, and hence the rotation of the spool 20 in the pull-out direction, is restricted. Pulling out the webbing belt 22 from the spool 20 is restricted. Thereby, the passenger | crew's body which is going to move ahead with the webbing belt 22 can be restrained reliably.

(Operation of the torsion shaft 24)
As described above, in the state where the rotation of the first lock base 34 is regulated by the first lock pawl 36, the occupant's body pulls the webbing belt 22 with a greater force, and the spool 20 in the pull-out direction based on this pulling force. When the rotational force exceeds the mechanical strength of the first deformable portion 28, the first deformable portion 28 is twisted while the first coupling portion 30 remains connected to the first lock base 34, and the spool 20 is twisted by this twist amount. Rotates in the pull-out direction.

  Therefore, the webbing belt 22 is pulled out from the spool 20 by the amount of rotation of the spool 20 in the pulling direction. As a result, the restraining force of the occupant by the webbing belt 22 is slightly weakened, and the energy used for pulling the webbing belt 22 is absorbed by the amount of torsional deformation.

(Operation of stopper wire 74)
Furthermore, as described above, the fact that the spool 20 rotates in the pull-out direction with respect to the first lock base 34 means that the first lock base 34 rotates in the winding direction relative to the spool 20. It is. Thus, when the first lock base 34 rotates in the winding direction with respect to the spool 20, one end of the stopper wire 74 remains in the wire locking hole 84 formed in the first lock base 34. The stopper wire 74 is pulled while being guided by the wire guide groove 82 of the first lock base 34.

  However, the stopper wire 74 has a longitudinal direction along the axial direction of the spool 20 inside the stopper accommodating hole 70, whereas the first lock base 34 pulls the stopper wire 74 in the winding direction. Therefore, as shown in FIG. 7B, the stopper wire 74 pulled by the first lock base 34 is squeezed at the edge of the opening end of the stopper accommodating hole 70 on the first lock base 34 side. Following the guide groove 82, the guide groove 82 is deformed so that its longitudinal direction is the longitudinal direction of the wire guide groove 82, that is, the rotational circumferential direction of the spool 20.

  As described above, even when the stopper wire 74 is pulled and deformed, the restraining force of the occupant by the webbing belt 22 is slightly weakened, and the energy used for pulling the webbing belt 22 by the amount of deformation of the stopper wire 74 is increased. The amount of energy absorbed by the stopper wire 74 is superposed on the amount of energy absorbed by the twist of the first deformable portion 28, and the energy used for pulling the webbing belt 22 can be effectively absorbed.

(Operation of the second lock mechanism 44)
Further, as described above, when the stopper wire 74 moves toward the first lock base 34 inside the stopper accommodation hole 70, the other end side of the stopper wire 74 that has entered the spring accommodation hole 62 has a through hole 66. It passes through and disengages from the spring accommodation hole 62 and is drawn into the stopper accommodation hole 70 from the end of the stopper accommodation hole 70 on the lock base 46 side. Thus, when the stopper wire 74 comes out of the spring accommodating hole 62, the interference of the stopper wire 74 with the plate 60 is eliminated. The plate 60 from which the interference from the stopper wire 74 has been eliminated rotates in the spring accommodating hole 62 by receiving the biasing force of the rotating disk biasing spring 64.

  Since the plate 60 is integral with the rotating disk 54, the rotating disk 54 rotates in the winding direction with respect to the second lock base 46 by rotating the plate 60 by the biasing force of the rotating disk biasing spring 64. To do. When the rotary disk 54 rotates in the winding direction with respect to the second lock base 46, the guide pin 56 presses the inner wall of the long hole 58 to rotate the second lock pawl 50 to one side around the pawl support pin 52.

  Thus, when the second lock pawl 50 rotates, the tip of the second lock pawl 50 protrudes to the outside of the second lock base 46, and the second lock pawl ratchet 94 at the tip of the second lock pawl 50 is connected to the lock ring 90. It meshes with the inner ratchet 92 (see FIG. 3).

  By the way, the spool 20 on which the webbing belt 22 is pulled is going to rotate in the pull-out direction. For this reason, the second lock pawl 50 tries to rotate in the pull-out direction together with the second lock base 46.

  Accordingly, the rotational force of the second lock base 46 in the pull-out direction is transmitted to the lock ring 90 with which the second lock pawl 50 is engaged, and the lock ring 90 tends to rotate in the pull-out direction. In this state, if the corner portion 100 </ b> A of the cam 100 is engaged with the winding direction side surface 96 </ b> A of the outer peripheral groove 96 of the lock ring 90, rotation of the lock ring 90 in the pull-out direction is restricted by the cam 100.

  When the rotation restriction of the lock ring 90 in the pull-out direction is made, the rotation of the second lock base 46 in the pull-out direction is also restricted. In this state, the rotational force in the pull-out direction of the spool 20 based on the pulling force when the occupant's body pulls the webbing belt 22 causes the mechanical strength of the first deformable portion 28 and the mechanical strength of the second deformable portion 40. The second deformable portion 40 is twisted together with the first deformable portion 28 while the second coupling portion 42 remains connected to the second lock base 46, and the spool 20 is pulled in the pull-out direction by this twist amount. Rotate.

  Therefore, the webbing belt 22 is pulled out from the spool 20 by the amount of rotation of the spool 20 in the pulling direction. As a result, the restraining force of the occupant by the webbing belt 22 is slightly weakened, and the energy used for pulling the webbing belt 22 is absorbed by the amount of torsional deformation. For this reason, energy absorption occurs due to torsional deformation of the first deformation portion 28 and the second deformation portion 40, and the limit load by the torsion shaft 24 is increased.

  On the other hand, as shown in FIG. 4, before the first lock mechanism 32 operates, the vehicle is in a sudden deceleration state or a state immediately before sudden deceleration, and the ECU is seated on the seat based on a signal from the physique detection means. When it is determined that the occupant's physique is less than a predetermined reference value, and an ignition signal is output from the ECU, the gas generator 112 is activated. When the gas generator 112 is activated, the piston 110 is pushed upward of the cylinder 108 and presses the other end portion of the cam 100 upward, whereby the cam 100 is rotated while breaking the shear pin 104, and the cam 100 Is separated from the outer peripheral groove 96 of the lock ring 90.

  In this state, when the rotational force in the pull-out direction of the spool 20 is transmitted to the lock ring 90 via the second lock base 46 and the second lock pawl 50, the lock ring 90 rotates in the pull-out direction together with the spool 20. Therefore, in this state, the first deformable portion 28 is twisted, but the second deformable portion 40 is not twisted. For this reason, only energy absorption due to torsional deformation of the first deformable portion 28 occurs, and the limit load by the torsion shaft 24 is reduced.

That is, in the present embodiment, by controlling the gas generator 112 , a mode in which the second deforming portion 40 is deformed (high load mode) and a mode in which the second deforming portion 40 is not deformed (low load mode). ) And can be switched. Thereby, it is possible to absorb energy appropriately according to the physique of the occupant wearing the webbing belt 22.

Further, when the gas generator 112 is not operated, the cam 100 is engaged with the outer peripheral groove 96 of the lock ring 90 and the limit load by the torsion shaft 24 is increased, while the cam 100 is operated when the gas generator 112 is operated. Is separated from the outer peripheral groove 96 of the lock ring 90, and the limit load by the torsion shaft 24 is reduced.

As described above, the cam 100 is separated from the outer peripheral groove 96 of the lock ring 90 by the operation of the gas generator 112 from the state in which the cam 100 is engaged with the outer peripheral groove 96 of the lock ring 90 (high load mode). Mode). Therefore, the cam 100 is engaged with the outer peripheral groove 96 of the lock ring 90 by the operation of the gas generator 112 from the state where the cam 100 is separated from the outer peripheral groove 96 of the lock ring 90 (low load mode). ), The configuration can be simplified, the limit load by the torsion shaft 24 can be increased to a high load early, and even if the operation of the gas generator 112 is slow, Since the limit load by the torsion shaft 24 is held at a high load, the movement amount of the occupant can be suppressed. Moreover, since the cam 100 is changed from the state in which the cam 100 is engaged with the outer peripheral groove 96 of the lock ring 90 to the state in which the cam 100 is separated from the outer peripheral groove 96 of the lock ring 90, the cam 100 with respect to the outer peripheral groove 96 of the lock ring 90 is changed. Since the assembly accuracy is good and there is no loss of driving force between the lock ring 90 and the cam 100, no extra force is required for the cam 100, and the operation of the cam 100 can be stabilized.

  Here, the second lock mechanism 44 has a structure in which only the cam 100 is interposed between the piston 110 driven by the gas generator 112 and the lock ring 90. For this reason, the number of parts of the second lock mechanism 44 can be reduced, and the structure of the second lock mechanism 44 can be simplified. Thereby, the assembly work of the second lock mechanism 44 can be facilitated, and the cost can be reduced.

  Further, the cam 100 is engaged with the outer peripheral groove 96 of the lock ring 90 at one place (corner portion 100A). Therefore, the positioning of the cam 100 with respect to the outer peripheral groove 96 of the lock ring 90 can be simplified, and the assembly accuracy of the cam 100 with respect to the outer peripheral groove 96 of the lock ring 90 can be easily improved. However, the rotation of the lock ring 90 in the pull-out direction can be appropriately restricted.

  Further, the support position (support shaft 102 position) of the cam 100 is arranged on the pull-out direction side of the lock ring 90 as compared with the engagement position of the cam 100 with the lock ring 90 (corner portion 100A position). Therefore, the cam 100 is engaged with the outer peripheral groove 96 of the lock ring 90 in order that the corner portion 100A of the cam 100 engages with the outer peripheral groove 96 of the lock ring 90 and prevents the lock ring 90 from rotating in the pull-out direction. It is not necessary to make the joint portion (corner portion 100A) inclined in the winding direction of the lock ring 90, the shape of the engaging portion of the cam 100 can be simplified, and the engagement of the cam 100 can be simplified. The strength of the joint portion can be increased. Moreover, since the load from the outer peripheral groove 96 of the lock ring 90 can also be received by the support shaft 102, the engagement of the cam 100 with the lock ring 90 can be stabilized.

  Further, after the gas generator 112 is operated and the corner portion 100A of the cam 100 is separated from the outer peripheral groove 96 of the lock ring 90, the corner portion 100A of the cam 100 again becomes the winding side surface 96A of the outer peripheral groove 96 of the lock ring 90. Even when engaged, the corner portion 100A of the cam 100 is pressed against the winding direction side surface 96A of the outer peripheral groove 96 of the lock ring 90 and is separated from the outer peripheral groove 96 of the lock ring 90. For this reason, it is possible to prevent the rotation of the lock ring 90 from being unnecessarily restricted after the gas generator 112 is operated.

  In the present embodiment, the rotation of the cam 100 is restricted by the shear pin 104, but the rotation of the cam 100 may be restricted by the shear pin 104. In this case, when the lock ring 90 rotates in the pull-out direction and the corner portion 100A of the cam 100 is pressed against the winding direction side surface 96A of the outer circumferential groove 96 of the lock ring 90, the corner portion 100A is moved to the lock ring 90. A rotational force in the approaching direction is applied. Further, the cam 100 is given a rotational force in the direction in which the corner portion 100A approaches the outer peripheral groove 96 of the lock ring 90 by its own weight, or prevents the cam 100 from rotating during normal operation of the vehicle and It is preferable that a positioning unit that can prevent the rotation of the cam 100 from being released at the time of deceleration is provided on the cover or the like.

  Further, in the present embodiment, the inside of the cylinder 108 is made high by the gas generated by the gas generator 112, and the state where the piston 110 is pushed out to the upper side of the cylinder 108 is maintained, so that the corner portion 100A of the cam 100 is maintained. It is good also as a structure by which the state spaced apart from the outer peripheral groove 96 of the lock ring 90 is hold | maintained. Thereby, after the gas generator 112 is operated, the corner portion 100A of the cam 100 can be reliably prevented from engaging with the winding direction side surface 96A of the outer peripheral groove 96 of the lock ring 90, and the lock ring 90 is pulled out. It is possible to reliably prevent unnecessary rotation of the motor.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  The webbing take-up device 200 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  As shown in FIGS. 9 and 10, in the webbing retractor 200 according to the present embodiment, a rectangular plate-like stopper arrangement hole 202 as an engaged portion is formed in a part of the outer periphery of the lock ring 90. The lower end of the stopper arrangement hole 202 is opened from the outer periphery of the lock ring 90. A stopper receiving hole 204 communicating with the circular hole 88 is formed in the base 86 corresponding to the stopper arrangement hole 202. Inside the stopper arrangement hole 202 is accommodated a stopper 206 having a substantially rectangular plate shape as an operating member, and the stopper 206 is engaged (arranged) with the lock ring 90. The stopper 206 protrudes from the outer periphery of the lock ring 90 into the stopper accommodation hole 204, and the stopper 206 is in contact with the side surface 204 </ b> A of the stopper accommodation hole 204 in the drawing direction. A shear pin placement recess 208 having a rectangular cross section is formed on the top of the stopper 206, and a cylindrical shear pin 210 is formed on the outer peripheral surface of the stopper placement hole 202, and the lower surface of the share pin placement recess 208 is formed on the shear pin 210. By abutting, the entire stopper 206 is prevented from being completely accommodated in the stopper arrangement hole 202. The stopper 206 is prevented from dropping from the stopper arrangement hole 202 by a shear pin (not shown) as a positioning means that protrudes from the leg plate 18. The stopper 206 may be prevented from dropping from the stopper arrangement hole 202 by, for example, being press-fitted into the stopper arrangement hole 202 as a positioning means.

  In a state where the stopper 206 protrudes from the outer periphery of the lock ring 90 and abuts against the side surface 204A of the stopper receiving hole 204, when the lock ring 90 tries to rotate in the pull-out direction, the rotational force of the lock ring 90 in the pull-out direction The stopper 204 receives the side 204A of the stopper receiving hole 204 through the stopper 206 and restricts (blocks) the rotation of the lock ring 90 in the pull-out direction.

  The cylinder housing hole 106 of the base 86 communicates with the stopper housing hole 204, and the upper end of the piston 110 housed in the upper end portion of the cylinder 108 fixed inside the cylinder housing hole 106 is the stopper housing hole 204. It protrudes inward and is arranged below the stopper 206.

  When the gas generator 112 is activated and the piston 110 is pushed out to the upper side of the cylinder 108, the piston 110 pushes the stopper 206 upward, so that the stopper 206 breaks the shear pin 210 and the shear pin formed protruding from the leg plate 18. However, the whole is completely accommodated (actuated) in the stopper arrangement hole 202.

  By the way, as shown in FIG. 11, the vehicle is suddenly decelerated, the second lock pawl 50 is engaged with the lock ring 90, and the lock ring 90 is moved via the spool 20, the second lock base 46 and the second lock pawl 50. If the stopper 206 protrudes from the outer periphery of the lock ring 90 and is in contact with the side surface 204A of the stopper receiving hole 204 in a state of rotating in the pull-out direction, the stopper 206 rotates the lock ring 90 in the pull-out direction. Is regulated. For this reason, energy absorption occurs due to torsional deformation of the first deformation portion 28 and the second deformation portion 40, and the limit load by the torsion shaft 24 is increased.

  On the other hand, as shown in FIG. 12, when the vehicle is suddenly decelerated or immediately before sudden decelerating and the gas generator 112 is operated before the first lock mechanism 32 operates, the piston is moved upward of the cylinder 108. 110 is pushed out, and the piston 110 presses the stopper 206 upward, so that the stopper 206 breaks the shear pin 210 and the shear pin formed protruding from the leg plate 18, and the whole is completely inside the stopper arrangement hole 202. Be contained. In this state, when the rotational force in the pull-out direction is transmitted to the lock ring 90 via the spool 20, the second lock base 46, and the second lock pawl 50, the lock ring 90 rotates in the pull-out direction. For this reason, only energy absorption due to torsional deformation of the first deformable portion 28 occurs, and the limit load by the torsion shaft 24 is reduced.

  Here, the second lock mechanism 44 has a structure in which only the stopper 206 is interposed between the piston 110 driven by the gas generator 112 and the lock ring 90. For this reason, the number of parts of the second lock mechanism 44 can be reduced, and the structure of the second lock mechanism 44 can be simplified. Thereby, the assembly work of the second lock mechanism 44 can be facilitated, and the cost can be reduced.

  Further, the stopper 206 is engaged with the stopper arrangement hole 202 of the lock ring 90 at one place (upper portion). For this reason, the positioning of the stopper 206 with respect to the lock ring 90 can be simplified, and the assembly accuracy of the stopper 206 with respect to the stopper arrangement hole 202 of the lock ring 90 can be easily improved. The rotation of 90 in the pulling-out direction can be appropriately regulated.

  In addition, the stopper 206 is partially accommodated in the stopper arrangement hole 202 of the lock ring 90 and protrudes from the outer periphery of the lock ring 90 to abut against the side surface 204 </ b> A of the stopper accommodation hole 204. For this reason, the shape of the stopper 206 for preventing the lock ring 90 from rotating in the pull-out direction can be simplified, and the strength of the stopper 206 can be increased.

  Further, after the gas generator 112 is activated, the gas generated by the gas generator 112 makes the inside of the cylinder 108 at a high pressure, and the state where the piston 110 is pushed out to the upper side of the cylinder 108 is maintained. Is prevented from projecting from the outer periphery of the lock ring 90 by the piston 110. For this reason, after the gas generator 112 is operated, the stopper 206 can be reliably prevented from coming into contact with the drawing direction side surface 204A of the stopper accommodation hole 204, and the rotation of the lock ring 90 in the drawing direction is unnecessarily restricted. This can be surely prevented.

<Third Embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS.

  The webbing take-up device 300 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  As shown in FIGS. 13 and 14, in the webbing take-up device 300 according to the present embodiment, the take-up side surface 96 </ b> A of the outer peripheral groove 96 on the outer periphery of the lock ring 90 is horizontally arranged. A piston receiving hole 302 communicating with the circular hole 88 is formed in the base 86 corresponding to the outer peripheral groove 96.

  The cylinder housing hole 106 of the base 86 communicates with the piston housing hole 302, and the piston 110 partially housed in the upper end portion of the cylinder 108 fixed inside the cylinder housing hole 106 may serve as an operating member. It functions and protrudes into the piston accommodation hole 302. The piston 110 has a substantially horizontal T-shaped plate shape, and the upper end of the piston 110 is engaged (contacted) with the winding side surface 96 </ b> A of the outer circumferential groove 96 of the lock ring 90. The piston 110 is positioned by positioning means (for example, a positioning protrusion formed on the cover).

  When the upper end of the piston 110 is engaged with the winding direction side surface 96A of the outer circumferential groove 96 of the lock ring 90, when the lock ring 90 tries to rotate in the pull-out direction, the rotational force in the pull-out direction of the lock ring 90 is changed to the piston. 110 is received and the rotation of the lock ring 90 in the pull-out direction is restricted (blocked).

  When the gas generator 112 is actuated, the piston 110 breaks the positioning means and is pushed out (driven and actuated) to the side of the upper end portion of the cylinder 108 to wind the outer peripheral groove 96 of the lock ring 90. The engagement of the upper end of the piston 110 with the directional side surface 96A is released.

  By the way, as shown in FIG. 15, the vehicle is suddenly decelerated, the second lock pawl 50 is engaged with the lock ring 90, and the lock ring 90 is moved via the spool 20, the second lock base 46 and the second lock pawl 50. If the upper end of the piston 110 is engaged with the winding direction side surface 96 </ b> A of the outer peripheral groove 96 of the lock ring 90 in a state of rotating in the pull-out direction, the piston 110 restricts the rotation of the lock ring 90 in the pull-out direction. Is done. For this reason, energy absorption occurs due to torsional deformation of the first deformation portion 28 and the second deformation portion 40, and the limit load by the torsion shaft 24 is increased.

  On the other hand, as shown in FIG. 16, when the vehicle is brought into a sudden deceleration state or a state just before sudden deceleration before the first lock mechanism 32 operates, and the gas generator 112 is operated, the upper end portion of the cylinder 108. As a result, the piston 110 breaks the positioning means and is pushed out, and the engagement of the upper end of the piston 110 with the winding side surface 96A of the outer circumferential groove 96 of the lock ring 90 is released. In this state, when the rotational force in the pull-out direction is transmitted to the lock ring 90 via the spool 20, the second lock base 46, and the second lock pawl 50, the lock ring 90 rotates in the pull-out direction. For this reason, only energy absorption due to torsional deformation of the first deformable portion 28 occurs, and the limit load by the torsion shaft 24 is reduced.

  Here, the second lock mechanism 44 has a structure in which nothing is interposed between the piston 110 driven by the gas generator 112 and the lock ring 90. For this reason, the number of parts of the second lock mechanism 44 can be reduced, and the structure of the second lock mechanism 44 can be simplified. Thereby, the assembly work of the second lock mechanism 44 can be facilitated, and the cost can be reduced.

  Further, the piston 110 is engaged with the outer peripheral groove 96 of the lock ring 90 at one place (upper end). For this reason, the positioning of the upper end of the piston 110 with respect to the winding direction side surface 96A of the outer peripheral groove 96 of the lock ring 90 can be simplified, and the piston 110 is assembled to the winding direction side surface 96A of the outer peripheral groove 96 of the lock ring 90. The accuracy can be improved easily, and the piston 110 can appropriately regulate the rotation of the lock ring 90 in the pull-out direction.

  Further, the piston 110 partially protrudes from the upper end portion of the cylinder 108, and the upper end is engaged with the winding direction side surface 96 </ b> A of the outer peripheral groove 96 of the lock ring 90. For this reason, the shape of the piston 110 for preventing the lock ring 90 from rotating in the pull-out direction can be simplified, and the strength of the piston 110 can be increased.

  Furthermore, after the gas generator 112 is activated, the gas generated by the gas generator 112 makes the inside of the cylinder 108 high in pressure, and the piston 110 is pushed out to the side of the upper end of the cylinder 108. . Therefore, after the gas generator 112 is operated, the piston 110 can be reliably prevented from engaging with the winding direction side surface 96A of the outer circumferential groove 96 of the lock ring 90, and the rotation of the lock ring 90 in the pull-out direction is prevented. Unnecessary restrictions can be reliably prevented.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  The webbing take-up device 400 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  As shown in FIGS. 17 and 18, in the webbing retractor 400 according to the present embodiment, a substantially hemispherical stopper portion arrangement hole 402 as an engaged portion is formed in a part of the outer periphery of the lock ring 90. In addition, the lower end of the stopper portion arrangement hole 402 is opened from the outer periphery of the lock ring 90. A columnar stopper portion accommodation hole 404 that communicates with the circular hole 88 is formed in the base 86 corresponding to the stopper portion arrangement hole 402.

  The cylinder housing hole 106 of the base 86 communicates with the stopper portion housing hole 404, and the piston 110 housed in the upper end portion of the cylinder 108 fixed inside the cylinder housing hole 106 has an upper shaft-shaped stopper. The portion 406 and the lower plate-like piston portion 408 are integrated to function as an operating member. The stopper portion 406 protrudes upward from the piston portion 408, and the stopper portion 406 passes through the upper wall of the cylinder 108 and has an upper end at the stopper portion arrangement hole 402 of the lock ring 90 through the stopper portion accommodation hole 404. Engaged (inserted). The piston 110 (piston portion 408) is positioned by positioning means (for example, a positioning projection formed on the cylinder 108), and the downward movement in the cylinder 108 is restricted.

  When the upper end of the stopper portion 406 of the piston 110 is engaged with the stopper portion arrangement hole 402 of the lock ring 90, when the lock ring 90 tries to rotate in the pull-out direction, the rotational force in the pull-out direction of the lock ring 90 is reduced to the stopper portion. 406 receives and the rotation of the lock ring 90 in the pull-out direction is restricted (blocked).

When the gas generator 112 is operated, the piston 110 (piston part 408) breaks the positioning means in the cylinder 108 and is moved downward (driven and operated), so that the stopper part arrangement hole of the lock ring 90 is moved. The engagement of the upper end of the stopper 406 to 402 is released.

  By the way, as shown in FIG. 19, the vehicle is suddenly decelerated, the second lock pawl 50 is engaged with the lock ring 90, and the lock ring 90 is moved via the spool 20, the second lock base 46 and the second lock pawl 50. If the upper end of the stopper portion 406 of the piston 110 is engaged with the stopper portion arrangement hole 402 of the lock ring 90 in a state of rotating in the pull-out direction, the stopper portion 406 restricts rotation of the lock ring 90 in the pull-out direction. Is done. For this reason, energy absorption occurs due to torsional deformation of the first deformation portion 28 and the second deformation portion 40, and the limit load by the torsion shaft 24 is increased.

  On the other hand, as shown in FIG. 20, before the first lock mechanism 32 operates, when the vehicle is in a sudden deceleration state or a state immediately before sudden deceleration, and the gas generator 112 is activated, the piston 110 is moved in the cylinder 108. The (piston part 408) breaks the positioning means and is moved downward, and the engagement of the piston 110 (the upper end of the stopper part 406) with the stopper part arrangement hole 402 of the lock ring 90 is released. In this state, when the rotational force in the pull-out direction is transmitted to the lock ring 90 via the spool 20, the second lock base 46, and the second lock pawl 50, the lock ring 90 rotates in the pull-out direction. For this reason, only energy absorption due to torsional deformation of the first deformable portion 28 occurs, and the limit load by the torsion shaft 24 is reduced.

  Here, the second lock mechanism 44 has a structure in which nothing is interposed between the piston 110 driven by the gas generator 112 and the lock ring 90. For this reason, the number of parts of the second lock mechanism 44 can be reduced, and the structure of the second lock mechanism 44 can be simplified. Thereby, the assembly work of the second lock mechanism 44 can be facilitated, and the cost can be reduced.

  Further, the stopper portion 406 of the piston 110 is engaged with the stopper portion arrangement hole 402 of the lock ring 90 at one place (upper end). Therefore, the piston 110 (stopper portion 406) can be easily aligned with the stopper portion arrangement hole 402 of the lock ring 90, and the piston 110 (stopper portion 406) is assembled with the stopper portion arrangement hole 402 of the lock ring 90. The attaching accuracy can be easily improved, and the stopper portion 406 of the piston 110 can appropriately regulate the rotation of the lock ring 90 in the pull-out direction.

  Further, the upper end of the stopper portion 406 of the piston 110 is engaged with the stopper portion arrangement hole 402 of the lock ring 90. For this reason, the shape of the piston 110 (stopper portion 406) for preventing the lock ring 90 from rotating in the pull-out direction can be simplified, and the strength of the piston 110 (stopper portion 406) can be increased. .

  Furthermore, after the gas generator 112 is activated, the pressure generated in the gas generator 112 is increased to a high pressure in the cylinder 108, and the piston 110 (piston portion 408) is kept in a state where it is moved downward in the cylinder 108. Is done. For this reason, after the gas generator 112 is actuated, it is possible to reliably prevent the upper end of the stopper portion 406 of the piston 110 from engaging with the stopper portion arrangement hole 402 of the lock ring 90 and to rotate the lock ring 90 in the pull-out direction. Can be reliably prevented from being unnecessarily regulated.

<Fifth embodiment>
Next, a fifth embodiment of the present invention will be described with reference to FIGS.

  The webbing take-up device 500 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  As shown in FIGS. 21 and 22, in the webbing retractor 500 according to the present embodiment, a stopper accommodating hole 502 communicating with the circular hole 88 is formed in the base 86 corresponding to the outer peripheral groove 96 on the outer periphery of the lock ring 90. A stopper 504 having a substantially rectangular plate shape as an operating member is accommodated inside the stopper accommodation hole 502. A piston housing hole 506 is formed in the base 86, and the piston housing hole 506 communicates with the lower end of the stopper housing hole 502.

  The cylinder housing hole 106 of the base 86 communicates with the piston housing hole 506, and an L-shaped plate-like piston 110 partially housed in the upper end portion of the cylinder 108 fixed inside the cylinder housing hole 106 is , Protruding into the stopper receiving hole 502 and disposed below the stopper 504. Thus, the piston 110 prevents the stopper 504 from moving downward, and the upper end of the stopper 504 is engaged (inserted) into the outer peripheral groove 96 of the lock ring 90.

  In a state where the upper end of the stopper 504 is engaged with the outer peripheral groove 96 of the lock ring 90, when the lock ring 90 tries to rotate in the pull-out direction, the stopper 504 receives the rotational force in the pull-out direction of the lock ring 90 and locks. The rotation of the ring 90 in the pull-out direction is restricted (blocked).

  When the gas generator 112 is operated and the piston 110 is pushed out from the upper end of the cylinder 108 to the side, the prevention of the downward movement of the stopper 504 by the piston 110 is released, and the stopper 504 moves downward. (Dropped) (actuated).

  By the way, as shown in FIG. 23, the vehicle is suddenly decelerated, the second lock pawl 50 is engaged with the lock ring 90, and the lock ring 90 is moved via the spool 20, the second lock base 46 and the second lock pawl 50. If the upper end of the stopper 504 is engaged with the outer peripheral groove 96 of the lock ring 90 in a state where it is going to rotate in the pull-out direction, the stopper 504 restricts the rotation of the lock ring 90 in the pull-out direction. For this reason, energy absorption occurs due to torsional deformation of the first deformation portion 28 and the second deformation portion 40, and the limit load by the torsion shaft 24 is increased.

  On the other hand, as shown in FIG. 24, when the vehicle is in a sudden deceleration state or a state immediately before sudden deceleration and the gas generator 112 is activated before the first lock mechanism 32 operates, the upper end portion of the cylinder 108 is Since the piston 110 is pushed out from the side, the prevention of the downward movement of the stopper 504 by the piston 110 is released, the stopper 504 is moved downward, and the stopper 504 to the outer peripheral groove 96 of the lock ring 90 is released. The upper end is disengaged. In this state, when the rotational force in the pull-out direction is transmitted to the lock ring 90 via the spool 20, the second lock base 46, and the second lock pawl 50, the lock ring 90 rotates in the pull-out direction. For this reason, only energy absorption due to torsional deformation of the first deformable portion 28 occurs, and the limit load by the torsion shaft 24 is reduced.

  Here, the second lock mechanism 44 has a structure in which only the stopper 504 is interposed between the piston 110 driven by the gas generator 112 and the lock ring 90. For this reason, the number of parts of the second lock mechanism 44 can be reduced, and the structure of the second lock mechanism 44 can be simplified. Thereby, the assembly work of the second lock mechanism 44 can be facilitated, and the cost can be reduced.

  Further, the stopper 504 is engaged with the outer peripheral groove 96 of the lock ring 90 at one place (upper end). For this reason, the positioning of the stopper 504 with respect to the outer peripheral groove 96 of the lock ring 90 can be simplified, and the assembly accuracy of the stopper 504 with respect to the outer peripheral groove 96 of the lock ring 90 can be easily improved. However, the rotation of the lock ring 90 in the pull-out direction can be appropriately restricted.

  Further, the upper end of the stopper 504 is engaged with the outer peripheral groove 96 of the lock ring 90. For this reason, the shape of the upper end of the stopper 504 for preventing rotation of the lock ring 90 in the pull-out direction can be simplified, and the strength of the stopper 504 can be increased.

<Sixth Embodiment>
Next, a sixth embodiment of the present invention will be described with reference to FIGS.

  A webbing take-up device 600 according to the present embodiment has substantially the same configuration as that of the first embodiment, but differs in the following points.

  As shown in FIGS. 25 and 26, in the webbing take-up device 600 according to the present embodiment, a stopper shaft accommodation hole 602 communicating with the circular hole 88 is formed in the base 86 corresponding to the outer peripheral groove 96 on the outer periphery of the lock ring 90. A stopper body accommodation hole 604 that is formed and communicated with the lower end of the stopper shaft accommodation hole 602 is formed. A stopper 606 as an operation member is accommodated inside the stopper shaft accommodation hole 602 and the stopper main body accommodation hole 604. The stopper 606 is configured such that the lower end of a shaft-like stopper shaft 608 is fixed to the upper end of a rectangular plate-shaped stopper main body 610. The stopper shaft 608 and the stopper main body 610 are respectively provided with a stopper shaft accommodation hole 602 and a stopper body accommodation. It is accommodated in the hole 604. As a result, the upper end of the stopper shaft 608 is engaged (inserted) with the outer peripheral groove 96 of the lock ring 90.

  In a state where the upper end of the stopper shaft 608 is engaged with the outer peripheral groove 96 of the lock ring 90, when the lock ring 90 tries to rotate in the pull-out direction, the stopper 606 receives the rotational force in the pull-out direction of the lock ring 90, The rotation of the lock ring 90 in the pull-out direction is restricted (blocked).

  The cylinder housing hole 106 of the base 86 communicates with the side portion of the stopper body housing hole 604, and the piston 110 housed at one end of the cylinder 108 fixed inside the cylinder housing hole 106 is connected to the stopper body 610 side. It is arranged in the direction.

  When the gas generator 112 is actuated to push the piston 110 laterally from one end of the cylinder 108, the stopper body 610 is moved laterally by the piston 110, and the stopper shaft 608 and the stopper body 610 are separated. The stopper shaft 608 is moved (dropped) downward (the stopper 606 is actuated).

  By the way, as shown in FIG. 27, the vehicle is suddenly decelerated, the second lock pawl 50 is engaged with the lock ring 90, and the lock ring 90 is moved via the spool 20, the second lock base 46 and the second lock pawl 50. If the upper end of the stopper shaft 608 is engaged with the outer peripheral groove 96 of the lock ring 90 in a state of rotating in the pull-out direction, the stopper 606 restricts the rotation of the lock ring 90 in the pull-out direction. For this reason, energy absorption occurs due to torsional deformation of the first deformation portion 28 and the second deformation portion 40, and the limit load by the torsion shaft 24 is increased.

  On the other hand, as shown in FIG. 28, before the first lock mechanism 32 operates, when the vehicle is in a sudden deceleration state or a state immediately before sudden deceleration and the gas generator 112 is operated, the piston is started from one end of the cylinder 108. When the 110 is pushed to the side, the stopper body 610 is moved to the side by the piston 110, the stopper shaft 608 and the stopper body 610 are separated, and the stopper shaft 608 is moved to the lower side. The engagement of the upper end of the stopper shaft 608 with the 90 outer circumferential groove 96 is released. In this state, when the rotational force in the pull-out direction is transmitted to the lock ring 90 via the spool 20, the second lock base 46, and the second lock pawl 50, the lock ring 90 rotates in the pull-out direction. For this reason, only energy absorption due to torsional deformation of the first deformable portion 28 occurs, and the limit load by the torsion shaft 24 is reduced.

  Here, the second lock mechanism 44 has a structure in which only the stopper 606 is interposed between the piston 110 driven by the gas generator 112 and the lock ring 90. For this reason, the number of parts of the second lock mechanism 44 can be reduced, and the structure of the second lock mechanism 44 can be simplified. Thereby, the assembly work of the second lock mechanism 44 can be facilitated, and the cost can be reduced.

  Further, the stopper shaft 608 of the stopper 606 is engaged with the outer peripheral groove 96 of the lock ring 90 at one place (upper end). Therefore, the positioning of the stopper 606 (stopper shaft 608) with respect to the outer peripheral groove 96 of the lock ring 90 can be simplified, and the assembly accuracy of the stopper 606 (stopper shaft 608) with respect to the outer peripheral groove 96 of the lock ring 90 can be easily performed. The stopper 606 can appropriately regulate the rotation of the lock ring 90 in the pull-out direction.

  Further, the upper end of the stopper shaft 608 is engaged with the outer peripheral groove 96 of the lock ring 90. Therefore, the shape of the stopper 606 (upper end of the stopper shaft 608) for preventing the lock ring 90 from rotating in the pull-out direction can be simplified, and the strength of the stopper 606 (upper end of the stopper shaft 608) is increased. can do.

It is a disassembled perspective view which shows the structure of the 2nd locking mechanism of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is a front view which shows the outline of a structure of the 2nd lock mechanism in the webbing winding apparatus which concerns on the 1st Embodiment of this invention. FIG. 5 is a front view corresponding to FIG. 2 showing an operating state of a second lock mechanism in the webbing take-up device according to the first embodiment of the present invention. FIG. 5 is a front view corresponding to FIG. 2 showing a lock release state of the lock ring of the second lock mechanism in the webbing take-up device according to the first embodiment of the present invention. It is front sectional drawing which shows the outline of a structure of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is a disassembled perspective view which shows the structure of the 2nd locking mechanism of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a positional relationship between a spool and a stopper wire in a webbing take-up device according to a first embodiment of the present invention, where (A) shows a state before the stopper wire moves, and (B) shows a stopper wire. Indicates the state of moving. It is a front view of the 1st lock base in the webbing winding device concerning a 1st embodiment of the present invention. It is a disassembled perspective view which shows the structure of the 2nd locking mechanism of the webbing winding apparatus which concerns on the 2nd Embodiment of this invention. It is a front view which shows the outline of a structure of the 2nd locking mechanism in the webbing winding apparatus which concerns on the 2nd Embodiment of this invention. It is a front view corresponding to FIG. 10 which shows the operating state of the 2nd lock mechanism in the webbing winding device concerning a 2nd embodiment of the present invention. It is a front view corresponding to FIG. 10 which shows the lock release state of the lock ring of the 2nd lock mechanism in the webbing take-up device according to the second embodiment of the present invention. It is a disassembled perspective view which shows the structure of the 2nd locking mechanism of the webbing winding apparatus which concerns on the 3rd Embodiment of this invention. It is a front view which shows the outline of a structure of the 2nd lock mechanism in the webbing winding apparatus which concerns on the 3rd Embodiment of this invention. FIG. 15 is a front view corresponding to FIG. 14 showing an operating state of a second lock mechanism in a webbing take-up device according to a third embodiment of the present invention. It is a front view corresponding to FIG. 14 which shows the lock release state of the lock ring of the 2nd lock mechanism in the webbing winding device concerning the 3rd embodiment of the present invention. It is a disassembled perspective view which shows the structure of the 2nd locking mechanism of the webbing retractor which concerns on the 4th Embodiment of this invention. It is a front view which shows the outline of a structure of the 2nd lock mechanism in the webbing winding apparatus which concerns on the 4th Embodiment of this invention. It is a front view corresponding to FIG. 18 which shows the operating state of the 2nd lock mechanism in the webbing winding device concerning a 4th embodiment of the present invention. It is a front view corresponding to FIG. 18 which shows the lock release state of the lock ring of the 2nd lock mechanism in the webbing winding device concerning a 4th embodiment of the present invention. It is a disassembled perspective view which shows the structure of the 2nd locking mechanism of the webbing winding apparatus which concerns on the 5th Embodiment of this invention. It is a front view which shows the outline of a structure of the 2nd locking mechanism in the webbing winding apparatus which concerns on the 5th Embodiment of this invention. FIG. 23 is a front view corresponding to FIG. 22 showing an operating state of a second lock mechanism in a webbing take-up device according to a fifth embodiment of the present invention. FIG. 23 is a front view corresponding to FIG. 22 showing a lock release state of the lock ring of the second lock mechanism in the webbing take-up device according to the fifth embodiment of the present invention. It is a disassembled perspective view which shows the structure of the 2nd locking mechanism of the webbing winding apparatus which concerns on the 6th Embodiment of this invention. It is a front view which shows the outline of a structure of the 2nd lock mechanism in the webbing winding apparatus which concerns on the 6th Embodiment of this invention. It is a front view corresponding to FIG. 26 which shows the operation state of the 2nd lock mechanism in the webbing winding device concerning the 6th embodiment of the present invention. It is a front view corresponding to FIG. 26 which shows the lock release state of the lock ring of the 2nd lock mechanism in the webbing take-up device according to the sixth embodiment of the present invention.

Explanation of symbols

10 Webbing take-up device 20 Spool (winding shaft)
22 Webbing belt (webbing)
24 Torsion shaft (force limiter mechanism)
44 Second lock mechanism (switching means)
90 Lock ring (switching means, moving member)
100 cam (switching means, actuating member)
110 piston (switching means, drive member, actuating member)
200 Webbing take-up device 206 Stopper (switching means, actuating member)
300 Webbing Winder 400 Webbing Winder 500 Webbing Winder 504 Stopper (Switching Means, Actuating Member)
600 Webbing take-up device 606 Stopper (switching means, actuating member)

Claims (4)

A take-up shaft on which a webbing that can be mounted on a vehicle occupant is taken up and rotated in the draw-out direction;
The first deformable portion and the second deformable portion have torsion shafts provided at different positions in the axial direction, and permit the rotation of the take-up shaft in the pull-out direction to act on the occupant from the webbing in the event of a vehicle emergency Force limiter mechanism to limit the load to be limited to the limit load,
A drive member that can be driven in an emergency of the vehicle, an operation member that is directly operated by driving the drive member, and a moving member that is engaged with the operation member and permitted to move by the operation of the operation member. Switching means for switching the limit load from a high load by the first deformable portion and the second deformable portion to a low load by the first deformable portion by allowing the movement of the moving member;
A webbing take-up device comprising: A take-up shaft on which a webbing that can be mounted on a vehicle occupant is taken up and rotated in the draw-out direction;
The first deformable portion and the second deformable portion have torsion shafts provided at different positions in the axial direction, and permit the rotation of the take-up shaft in the pull-out direction to act on the occupant from the webbing in the event of a vehicle emergency Force limiter mechanism to limit the load to be limited to the limit load,
A drive member that can be driven in an emergency of the vehicle, and a moving member that is engaged with the drive member and permitted to move by driving the drive member, and the movement of the moving member is permitted. Switching means for switching the limit load from a high load by the first deformable portion and the second deformable portion to a low load by the first deformable portion;
A webbing take-up device comprising: A take-up shaft on which a webbing that can be mounted on a vehicle occupant is taken up and rotated in the draw-out direction;
The first deformable portion and the second deformable portion have torsion shafts provided at different positions in the axial direction, and permit the rotation of the take-up shaft in the pull-out direction to act on the occupant from the webbing in the event of a vehicle emergency Force limiter mechanism to limit the load to be limited to the limit load,
An actuating member that can be actuated in an emergency of the vehicle, and a moving member that can be engaged at one location and can be switched between blocking and allowing movement by actuating the actuating member. A switching means for switching the limit load between a high load by the first deformable portion and the second deformable portion and a low load by the first deformable portion by switching between operation and non-operation of a member;
A webbing take-up device comprising: A take-up shaft on which a webbing that can be mounted on a vehicle occupant is taken up and rotated in the draw-out direction;
The first deformable portion and the second deformable portion have torsion shafts provided at different positions in the axial direction, and permit the rotation of the take-up shaft in the pull-out direction to act on the occupant from the webbing in the event of a vehicle emergency Force limiter mechanism to limit the load to be limited to the limit load,
An actuating member that can be actuated via a fluid pressure and maintained in an actuated state via the fluid pressure in a vehicle emergency, and a moving member that is switched between blocking and allowing movement by actuation of the actuating member Switching to switch the limit load between a high load due to the first deformation portion and the second deformation portion and a low load due to the first deformation portion by switching between operation and non-operation of the operation member. Means,
A webbing take-up device comprising:

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