JP5539042B2 - Webbing take-up device - Google Patents

Description

  The present invention relates to a webbing take-up device in which a motor rotates a spool.

  In the webbing take-up device described in Patent Document 1 below, the power generated by the motor is transmitted to the spindle body via a plurality of gears of the power transmission mechanism. Furthermore, when the gas generator generates gas, the force limiter load (energy absorption force) due to the operation of the force limiter mechanism is switched.

  However, in this webbing take-up device, a gas generator is disposed above the power transmission mechanism. For this reason, the arrangement space of the power transmission mechanism and the gas generator is large in the vertical direction, and the physique of the webbing take-up device is enlarged.

JP 2010-30502 A

  An object of the present invention is to obtain a webbing take-up device capable of suppressing an increase in size when a plurality of reduction gears and fluid generating means are provided in consideration of the above facts.

  The webbing take-up device according to claim 1, wherein the webbing to be mounted on an occupant is taken up and rotated in the take-up direction so that the webbing is taken up, and the webbing is drawn out to draw out the webbing take-up device. A spool that is rotated to a position, a motor that generates power, and a connecting line that connects at least a portion of the central axis line in the orthogonal direction is bent to form a space between at least a portion of the motor. A plurality of reduction gears that rotate the spool by decelerating and transmitting the generated power to the spool, and a force that allows the webbing to be pulled out from the spool at a force greater than a force limiter load. The limiter mechanism is inserted into the space and the plurality of reduction gears are arranged within the range of the protruding width in the spool axial direction to generate fluid. And a, and the fluid generating means force limiter load is switched Rukoto.

  A webbing take-up device according to a second aspect is the webbing take-up device according to the first aspect, wherein the webbing take-up device is provided in the fluid generating means, and a connection portion is provided, and electrical connection is performed from the connection portion. A connector is provided and the space is opened to the inside of the vehicle so that the connection portion is directed to the inside of the vehicle.

  In the webbing take-up device according to claim 1, the webbing to be mounted on the occupant is wound on the spool, and the spool is rotated in the take-up direction so that the webbing is taken up on the spool, and from the spool. By pulling out the webbing, the spool is rotated in the drawing direction.

  Also, the power generated by the motor is reduced by a plurality of reduction gears and transmitted to the spool, whereby the spool is rotated.

  Further, when the force limiter mechanism is actuated, it is allowed to withdraw from the webbing spool with a force exceeding the force limiter load. Moreover, the force limiter load is switched when the first fluid generating means generates the fluid.

  Here, the plurality of reduction gears are arranged in a state in which a connecting line that connects at least some central axes of the plurality of reduction gears in the orthogonal direction is bent, and there is a space between at least some of the plurality of reduction gears. The fluid generation means is inserted into the space, and a plurality of reduction gears are arranged within the range of the projecting width of the fluid generation means in the spool axis direction.

  For this reason, the arrangement space of the plurality of reduction gears and the fluid generating means can be reduced, and an increase in the size of the webbing take-up device can be suppressed.

  In the webbing take-up device according to the second aspect of the present invention, the connector provided in the fluid generating means is provided with a connecting portion, and the connector is electrically connected from the connecting portion.

  Here, the space is opened to the inside of the vehicle, and the connecting portion of the connector is directed to the inside of the vehicle. For this reason, electrical connection to the connector can be easily performed from the inside of the vehicle.

It is the disassembled perspective view which looked at the vehicle front-back direction one side and the vehicle width direction inner side which show the principal part of the webbing winding device concerning an embodiment of the invention. It is sectional drawing seen from the vehicle width direction inner side which shows the principal part of the webbing winding device concerning an embodiment of the invention. It is the disassembled perspective view seen from the vehicle front-back direction other side and the vehicle width direction inside which shows the principal part of the 2nd lock mechanism in the webbing winding device concerning an embodiment of the invention. It is the side view seen from the vehicle front-back direction other side which shows the state except the drive mechanism and urging | biasing mechanism of the webbing winding device which concerns on embodiment of this invention. It is the front view seen from the vehicle width direction outer side which shows the state except the drive mechanism and urging | biasing mechanism of the webbing winding device which concerns on embodiment of this invention. It is the side view seen from the vehicle front-back direction other side which shows the state except the biasing mechanism of the webbing winding device concerning an embodiment of the invention. It is the front view seen from the vehicle width direction outer side which shows the state except the biasing mechanism of the webbing winding device concerning an embodiment of the invention.

  FIG. 1 shows an exploded perspective view of a main part of a webbing take-up device 10 according to an embodiment of the present invention as seen from one side in the vehicle front-rear direction and the inner side in the vehicle width direction. The main part of the webbing take-up device 10 is shown in a sectional view as seen from the inside in the vehicle width direction. In the drawings, one side in the vehicle front-rear direction is indicated by an arrow LO, the inner side in the vehicle width direction is indicated by an arrow IN, and the upper side is indicated by an arrow UP.

  The webbing take-up device 10 according to the present embodiment is installed in a substantially rectangular cylindrical center pillar (not shown) as a vehicle installation member. An installation hole (not shown) is formed at the lower end of the center pillar, and the installation hole opens inside the center pillar to the vehicle interior side in the vehicle width direction (vehicle inside). The webbing take-up device 10 is inserted into the center pillar through the installation hole from the passenger compartment side.

  As shown in FIGS. 1 and 2, the webbing take-up device 10 is provided with a metal frame 12 having a U-shaped cross section as an arrangement member, and the frame 12 has a back plate on the inner side in the vehicle width direction. 12A, a leg plate 12B on one side in the vehicle longitudinal direction, and a leg plate 12C on the other side in the vehicle longitudinal direction are provided. The frame 12 is fixed to the vehicle below the center pillar installation hole at the lower part of the back plate 12A, whereby the webbing take-up device 10 is installed in the center pillar and the webbing take-up device 10 The upper part of the lower part of the back plate 12A faces the installation hole of the center pillar in the vehicle width direction.

  A substantially rectangular plate-like extension plate 12D as a pressure receiving portion is integrally formed on the upper side of the leg plate 12C, and the extension plate 12D extends upward from the leg plate 12B. A circular arrangement hole 14A and an arrangement hole 14B are formed through the leg plate 12B and the leg plate 12C, respectively, and the arrangement hole 14A and the arrangement hole 14B are opposed to each other.

  Between the leg plate 12B (arrangement hole 14A) and the leg plate 12C (arrangement hole 14B) of the frame 12, a substantially cylindrical spool 16 as a winding member constituting the winding shaft is rotatably arranged. One end 16A on the leg plate 12B side of the spool 16 is arranged on the leg plate 12C side of the arrangement hole 14A, and the other end 16B on the leg plate 12C side of the spool 16 is arranged on the leg plate 12B side of the arrangement hole 14B.

  A long belt-like webbing 18 (belt) is wound on the spool 16 from the base end side, and the webbing 18 extends upward from the frame 12 and is seated on a vehicle seat (not shown). It is attached to. Further, when the spool 16 is rotated in the winding direction (the direction of arrow A in FIG. 1), the webbing 18 is wound around the spool 16 and the webbing 18 is pulled out from the spool 16 so that the spool 16 is It is rotated in the drawing direction (the direction of arrow B in FIG. 1).

  The webbing take-up device 10 is provided with a force limiter mechanism 20.

  A torsion shaft 22 serving as an energy absorbing member constituting the take-up shaft is accommodated in the spool 16 along the central axis. A connecting portion 24 is coaxially and integrally formed on the torsion shaft 22 between one end 16A and the other end 16B of the spool 16, and the torsion shaft 22 is coaxial with the spool 16 at the connecting portion 24. And they are connected together.

  The torsion shaft 22 is formed with a columnar first deformable portion 26 on the leg plate 12B side of the connecting portion 24, and the first coupling portion 28 is coaxial with the leg plate 12B side portion of the first deformable portion 26. And it is formed integrally. The torsion shaft 22 is formed with a cylindrical second deformable portion 30 on the leg plate 12C side of the connecting portion 24, and a second coupling portion 32 is coaxial with the leg plate 12C side portion of the second deformable portion 30. And it is formed integrally.

  A first lock mechanism 34 constituting the force limiter mechanism 20 is provided on the leg plate 12B side of the torsion shaft 22.

  A first lock base 36 as a first rotating body is coaxially and integrally connected to the first coupling portion 28 of the torsion shaft 22, and the leg plate 12 </ b> B is radially outside the first lock base 36. The first lock pawl 38 is rotatably supported. When the vehicle is suddenly decelerated and when the spool 16 is suddenly rotated in the pull-out direction, the ratchet teeth at one end of the first lock pawl 38 mesh with the ratchet teeth on the outer periphery of the first lock base 36, and The rotation of the one lock base 36 in the pull-out direction is locked (the rotation of the first lock base 36 in the winding direction is allowed).

  As shown in FIGS. 2 and 3, a second lock mechanism 40 serving as a switching unit constituting the force limiter mechanism 20 is provided on the leg plate 12 </ b> C side of the torsion shaft 22.

  A second lock base 42 as a second rotating body is coaxially and integrally connected to the second coupling portion 32 of the torsion shaft 22, and a pair of second lock pawls 44 are connected to the second lock base 42. The base end of is rotatably supported. On the opposite side of the second lock base 42 from the spool 16, a rotating disk 46 is provided as an operating member, and the rotating disk 46 is coaxially supported relative to the second lock base 42. Has been.

  A rectangular spring accommodating hole 42A is formed in the second lock base 42, and a flat plate 46A is formed on the surface of the rotary disk 46 on the second lock base 42 side so as to protrude. The plate 46A is accommodated in the accommodation hole 42A. An energizing spring 48 is accommodated in the spring accommodating hole 42 </ b> A, and the energizing spring 48 is stretched between the peripheral surface of the spring accommodating hole 42 </ b> A of the second lock base 42 and the plate 46 </ b> A of the rotating disk 46. ing. As a result, the urging spring 48 urges the rotating disk 46 in the winding direction or withdrawing direction with respect to the second lock base 42, and the rotating disk 46 due to the urging force of the urging spring 48 as described later. The relative rotation with respect to the second lock base 42 is restricted.

  A pair of guide pins 46 </ b> B project from the surface of the rotary disk 46 on the second lock base 42 side, and the guide pins 46 </ b> B are inserted into elongated holes 44 </ b> A formed in the second lock pawl 44. . For this reason, when the rotary disk 46 is rotated relative to the second lock base 42 by the biasing force of the biasing spring 48, the guide pin 46B is moved in the long hole 44A, and the second lock pawl 44 is moved. The tip is rotated outward in the radial direction of the second lock base 42.

  A stopper accommodating hole 50 is formed in the spool 16, and the stopper accommodating hole 50 is arranged in parallel to the central axis of the spool 16 and penetrates the spool 16 to spring spring holes of the second lock base 42. It communicates with 42A. A stopper wire 52 having a longitudinal bar shape is accommodated in the stopper accommodation hole 50, and one end of the stopper wire 52 is engaged with the first lock base 36. The other end of the stopper wire 52 is inserted into the spring accommodating hole 42 </ b> A of the second lock base 42, and is disposed on the opposite side of the biasing spring 48 with respect to the plate 46 </ b> A of the rotating disk 46. The other end restricts relative rotation of the rotating disk 46 with respect to the second lock base 42 by the urging force of the urging spring 48 by interference of the plate 46A.

  As shown in FIGS. 1, 4, and 5, a switching mechanism 54 constituting the second lock mechanism 40 is provided outside the leg plate 12 </ b> C of the frame 12. The switching mechanism 54 is provided with a box-shaped body 56. The body 56 is fixed to the leg plate 12C, and includes a second lock base 42 (including a pair of second lock pawls 44) and a rotating disk. 46 and a biasing spring 48 are inserted.

  In the body 56, an annular plate-like lock ring 58 as a rotating member is supported on the outer periphery of the second lock base 42, and the lock ring 58 rotates relative to the second lock base 42 coaxially. Has been made possible. An inner ratchet 58A is formed on the inner periphery of the lock ring 58, and the tip end of the second lock pawl 44 is rotated outward in the radial direction of the second lock base 42 as described above. The ratchet teeth at the tip of 44 are engaged (engaged) with the inner ratchet 58A, and the rotational force in the pull-out direction of the second lock base 42 is transmitted to the lock ring 58 via the pair of second lock pawls 44 (first (2) The rotational force in the winding direction of the lock base 42 is not transmitted to the lock ring 58). An outer peripheral groove 58B having a triangular cross section is formed on the outer periphery of the upper portion of the lock ring 58.

  A plate-like pawl 60 as a switching member is rotatably supported on the upper portion of the body 56, and the lower portion of the pawl 60 is engaged (fitted) with an outer peripheral groove 58 </ b> B of the lock ring 58. . A shear pin 62 as a locking means protrudes from the upper portion of the body 56, and the shear pin 62 penetrates the pawl 60 and locks the rotation of the pawl 60. As a result, the pawl 60 regulates the rotation of the lock ring 58 in the winding direction and the drawing direction.

  A cylindrical cylinder 64 as a supply member is integrally provided on the upper portion of the body 56 (above the spool 16), and the cylinder 64 is disposed on the side of the extension plate 12D of the frame 12 (leg plate 12C). Has been. A front end side portion of the cylinder 64 is provided in the body 56, and a proximal end side portion of the cylinder 64 protrudes from the back plate 12 A side portion of the body 56 to the opposite side to the frame 12. A piston 66 is accommodated in the tip end portion of the cylinder 64, and the piston 66 is opposed to the upper portion of the pawl 60.

  A gas generator 68 (micro gas generator) as a fluid generating means is accommodated in the base end side portion of the cylinder 64, and a connector 70 is provided in the gas generator 68. A substantially bottomed cylindrical cap 72 is fixed to the base end of the cylinder 64, and the cap 72 fixes the gas generator 68 to the cylinder 64. A circular insertion port 70A as a connection portion is opened on the surface on the back plate 12A side of the connector 70, and a circular connection hole 72A is formed in the bottom wall of the cap 72 so as to pass therethrough. The hole 72A opens the insertion port 70A toward the installation hole side of the center pillar.

  In the connector 70, a vehicle-side connector (not shown) from the vehicle control device 74 (ECU) is connected to the insertion port 70A from the connection hole 72A of the cap 72 through the installation hole of the center pillar from the vehicle compartment side. It is electrically connected to the control device 74. The control device 74 is electrically connected to a physique sensor (not shown) and a collision prediction sensor or a collision detection sensor (not shown). The physique sensor detects the physique of the occupant by detecting the load acting on the seat on which the occupant is seated and the amount of webbing 18 drawn from the spool 16. The collision prediction sensor predicts a vehicle collision, and the collision detection sensor detects a vehicle collision.

  When the physique of the occupant detected by the physique sensor is less than the reference value, when the collision prediction sensor predicts a vehicle collision or when the collision detection sensor detects a vehicle collision, the control device 74 controls the gas. The generator 68 is activated, and the gas generator 68 instantaneously generates high-pressure gas (fluid). On the other hand, when the physique of the occupant detected by the physique sensor is greater than or equal to the reference value, the gas generator 68 is activated when the collision prediction sensor predicts a vehicle collision or when the collision detection sensor detects a vehicle collision. Not.

  When the gas generator 68 generates gas, the gas is supplied into the cylinder 64, and the pressure of the gas acts on the piston 66, so that the piston 66 presses the upper portion of the pawl 60. For this reason, when the shear pin 62 is broken and the pawl 60 is rotated by the movement of the piston 66, the engagement of the lower part of the pawl 60 with the outer peripheral groove 58B of the lock ring 58 is released, and the lock ring 58 is wound up. Rotation in the direction and withdraw direction is allowed.

  As shown in FIGS. 1, 6 and 7, the webbing take-up device 10 is provided with a drive mechanism 76 on the opposite side of the force limiter mechanism 20 from the frame 12. The drive mechanism 76 is provided with a case 78, and the case 78 is fixed to the body 56.

  A motor 80 is fixed to the upper part (upper side of the spool 16) and the outer side of the case 78. The motor 80 is disposed on the upper side of the frame 12 and fixed to the extension plate 12D of the frame 12 (leg plate 12C). Has been. The motor 80 is provided with a motor connector 82. The motor connector 82 is provided with a rectangular insertion port 82A serving as a motor connecting portion, and the insertion port 82A is directed toward the center pillar installation hole side. It has been. The motor connector 82 is electrically connected to the control device 74 by connecting a vehicle side motor connector (not shown) from the control device 74 to the insertion port 82A through the center pillar installation hole from the passenger compartment side. Yes. When the collision prediction sensor predicts a vehicle collision, the motor 80 is driven under the control of the control device 74.

  A gear mechanism 84 (reduction mechanism) is provided in the case 78, and the output shaft of the motor 80 is inserted into the case 78 so that the first gear 86 as a reduction gear can rotate coaxially and integrally. It is fixed. A second gear 88 as a reduction gear is engaged with the first gear 86, and a third gear 90 as a reduction gear is fixed to the second gear 88 so as to be coaxial and integrally rotatable. A fourth gear 92 as a reduction gear is engaged with the third gear 90, and a fifth gear 94 as a reduction gear is connected to the fourth gear 92 so as to be coaxial and integrally rotatable. The fifth gear 94 meshes with a sixth gear 96 as a reduction gear, and the sixth gear 96 meshes with a clutch gear 98 as a reduction gear. Therefore, when the motor 80 is driven, the first gear 86, the second gear 88, the third gear 90, the fourth gear 92, the fifth gear 94, the sixth gear 96, and the clutch gear 98 are rotated, The power (rotational force) generated by the motor 80 is decelerated and transmitted to the clutch gear 98.

  The central axes of the second gear 88 and the third gear 90, the central axes of the fourth gear 92 and the fifth gear 94, the central axis of the sixth gear 96, and the central axis of the clutch gear 98 are connected in this order in the orthogonal direction. The connecting line L (see FIG. 6) is bent in a substantially U shape, and the second gear 88, the third gear 90, the fourth gear 92, the fifth gear 94, the sixth gear 96, and the clutch gear 98 are , And is generally curved and arranged in a U-shape. Therefore, a space 100 is formed between the second gear 88, the fourth gear 92, the sixth gear 96, and the clutch gear 98 (between the position of the motor 80 and the position of the clutch gear 98). The space 100 is open to the force limiter mechanism 20 side, the side opposite to the force limiter mechanism 20 and the back plate 12A side (center pillar installation hole side).

  The case 78 has a recess 102 corresponding to the space 100. The recess 102 is open to the force limiter mechanism 20 side and the back plate 12A side (center pillar installation hole side), and the base end side portion of the cylinder 64 of the force limiter mechanism 20 is fitted (inserted) into the recess 102. Has been. Thereby, the base end side portion of the cylinder 64, the gas generator 68 and the cap 72 are arranged in the space 100. Further, the first gear 86, the second gear 88, the third gear 90, the fourth gear 92, the fifth gear 94, the sixth gear 96 and the clutch gear 98 are the proximal end side portion of the cylinder 64, the gas generator 68 and the cap. 72 is disposed within a range of a width projecting toward the case 78 (see FIG. 7).

  The clutch gear 98 is disposed coaxially with the torsion shaft 22 of the force limiter mechanism 20, and the torsion shaft 22 is inserted through the clutch gear 98. A clutch mechanism (not shown) is provided between the clutch gear 98 and the torsion shaft 22. The clutch gear 98 and the clutch mechanism allow the torsion shaft 22 to rotate in the winding direction and the pulling direction. Yes. When the motor 80 is driven as described above, the clutch mechanism connects the clutch gear 98 and the torsion shaft 22 so that the rotational force of the clutch gear 98 is transmitted to the torsion shaft 22 via the clutch mechanism. The torsion shaft 22 and the spool 16 are rotated in the winding direction. Thereafter, when the spool 16 and the torsion shaft 22 are rotated in the winding direction with respect to the clutch gear 98, the clutch mechanism releases the connection between the clutch gear 98 and the torsion shaft 22.

  As shown in FIG. 1, the webbing take-up device 10 is provided with an urging mechanism 104 on the side opposite to the frame 12 of the drive mechanism 76, and the urging mechanism 104 is connected to the torsion shaft 22. . For this reason, the urging mechanism 104 urges the torsion shaft 22 and the spool 16 in the winding direction, and the urging force in the winding direction on the spool 16 is applied to the webbing 18.

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

  In the webbing take-up device 10 configured as described above, the webbing 18 is pulled out from the spool 16 and attached to the occupant seated on the vehicle seat. Further, the urging mechanism 104 applies an urging force in the winding direction to the spool 16 to the webbing 18, whereby the webbing 18 is brought into close contact with the occupant.

  When the collision prediction sensor predicts a vehicle collision, the motor 80 of the drive mechanism 76 is driven under the control of the control device 74. Therefore, the first gear 86, the second gear 88, the third gear 90, the fourth gear 92, the fifth gear 94, the sixth gear 96, and the clutch gear 98 of the gear mechanism 84 are rotated, so that the clutch gear 98 is rotated. Is transmitted to the torsion shaft 22 through the clutch mechanism, and the torsion shaft 22, the first lock base 36, the second lock base 42, and the spool 16 are rotated in the winding direction. As a result, the webbing 18 is wound on the spool 16 and the slack of the webbing 18 is removed.

  Thereafter, when the vehicle collides, the vehicle is decelerated rapidly, or the webbing 18 is suddenly pulled out from the spool 16 due to the movement of the occupant's inertia, and the spool 16 is rapidly rotated in the pulling direction. For this reason, the first lock mechanism 34 is operated, the ratchet teeth at one end of the first lock pawl 38 mesh with the ratchet teeth on the outer periphery of the first lock base 36, and the rotation of the first lock base 36 in the pull-out direction is locked. Is done. Accordingly, the rotation of the first lock base 36, the torsion shaft 22, the second lock base 42, and the spool 16 in the pull-out direction is locked, and the pull-out of the webbing 18 from the spool 16 is locked. The crew is restrained.

  When the load acting on the occupant from the webbing 18 becomes equal to or greater than the first force limiter load, the force limiter mechanism 20 is operated, and the first deforming portion 26 of the torsion shaft 22 is twisted and deformed. The spool 16 is rotated in the pull-out direction with respect to the lock base 36.

  For this reason, the stopper wire 52 locked to the first lock base 36 is moved to the first lock base 36 side through the stopper accommodation hole 50 of the spool 16, and the stopper wire 52 is connected to the rotating disk 46 (plate 46 </ b> A). By releasing the interference, the second lock mechanism 40 is operated, and the rotating disk 46 is rotated relative to the second lock base 42 by the biasing force of the biasing spring 48. As a result, the guide pin 46B of the rotating disk 46 is moved in the elongated hole 44A of the second lock pawl 44, and the tip of the second lock pawl 44 is rotated outward in the radial direction of the second lock base 42. Thus, the ratchet teeth at the tip of the second lock pawl 44 are engaged with the inner ratchet 58A of the lock ring 58 so that the lock ring 58 can rotate in the pull-out direction integrally with the second lock base 42.

  When the physique of the occupant detected by the physique sensor is less than the reference value, when the collision prediction sensor predicts a vehicle collision or when the collision detection sensor detects a vehicle collision, the control device 74 controls the gas. The generator 68 is activated, and the gas generator 68 instantaneously generates high-pressure gas.

  When the gas generator 68 generates gas, the gas is supplied into the cylinder 64, and the pressure of the gas acts on the piston 66, so that the piston 66 presses the upper portion of the pawl 60. For this reason, when the shear pin 62 is broken and the pawl 60 is rotated by the movement of the piston 66, the engagement of the lower part of the pawl 60 with the lock ring 58 outer peripheral groove 58B is released, and the lock ring 58 is pulled out. Rotation to is allowed.

  As a result, after the ratchet teeth at the tip of the second lock pawl 44 are engaged with the inner ratchet 58A of the lock ring 58 as described above, the lock ring 58 is rotated integrally with the second lock base 42 in the pull-out direction. The first deforming portion 26 of the torsion shaft 22 is continuously twisted and deformed (the second deforming portion 30 of the torsion shaft 22 is not twisted and deformed), and the spool 16 rotates in the pull-out direction with respect to the first lock base 36. Is done. For this reason, the webbing 18 is allowed to be pulled out from the spool 16, and the first deformation portion 26 of the torsion shaft 22 absorbs the kinetic energy of the occupant. Accordingly, the force limiter load of the force limiter mechanism 20 (the load that allows the webbing 18 to be pulled out from the spool 16) is set to the first force limiter load (the torsional deformation load of the first deformation portion 26).

  On the other hand, when the physique of the occupant detected by the physique sensor is greater than or equal to the reference value, the gas generator 68 is activated when the collision prediction sensor predicts a vehicle collision or when the collision detection sensor detects a vehicle collision. Not. For this reason, the engagement of the lower part of the pawl 60 with the outer peripheral groove 58B of the lock ring 58 is maintained, and the pawl 60 restricts the rotation of the lock ring 58 in the pull-out direction.

  Thereby, after the ratchet teeth at the tip of the second lock pawl 44 are engaged with the inner ratchet 58A of the lock ring 58 as described above, the lock ring 58 locks the rotation of the second lock base 42 in the pull-out direction. The second deformable portion 30 as well as the first deformable portion 26 of the torsion shaft 22 is torsionally deformed, and the spool 16 is rotated in the pull-out direction with respect to the first lock base 36 and the second lock base 42. For this reason, the webbing 18 is allowed to be pulled out from the spool 16, and the first deformation portion 26 and the second deformation portion 30 of the torsion shaft 22 absorb the kinetic energy of the occupant. Accordingly, the force limiter load of the force limiter mechanism 20 is set to the second force limiter load (the sum of the torsional deformation load of the first deformation portion 26 and the torsional deformation load of the second deformation portion 30).

  As described above, the force limiter load of the force limiter mechanism 20 is switched between the first force limiter load and the second force limiter load.

  By the way, the gas generator 68 of the force limiter mechanism 20 is provided with a connector 70, and the connector 70 is connected to the bottom wall of the cap 72 from the vehicle compartment side through the center pillar installation hole. The connection hole 72A is connected to the insertion port 70A and is electrically connected to the control device 74.

  The motor 80 of the drive mechanism 76 is provided with a motor connector 82. The motor connector 82 has a vehicle side motor connector from the control device 74 inserted from the vehicle compartment side through an installation hole of the center pillar. 82A and electrically connected to the control device 74.

  Here, the central axes of the second gear 88 and the third gear 90 of the gear mechanism 84, the central axes of the fourth gear 92 and the fifth gear 94, the central axis of the sixth gear 96, and the center of the clutch gear 98 in the drive mechanism 76. The connecting line L that connects the axis lines in this order in the orthogonal direction is bent in a substantially U shape, and is located between the second gear 88, the fourth gear 92, the sixth gear 96, and the clutch gear 98 (the position of the motor 80). And a position of the clutch gear 98), a space 100 is formed, and in this space 100, the base end side portion of the cylinder 64, the gas generator 68 and the cap 72 in the switching mechanism 54 of the force limiter mechanism 20 are arranged. Has been.

  For this reason, the arrangement space in the vertical direction between the gear mechanism 84 of the drive mechanism 76 and the projecting portion of the switching mechanism 54 toward the drive mechanism 76 (the base end side portion of the cylinder 64, the gas generator 68 and the cap 72) can be reduced.

  Further, the first gear 86, the second gear 88, the third gear 90, the fourth gear 92, the fifth gear 94, the sixth gear 96 and the clutch gear 98 of the gear mechanism 84 are the base end side portion of the cylinder 64, gas The generator 68 and the cap 72 are disposed within the range of the protrusion width to the drive mechanism 76 side.

  For this reason, the arrangement space in the vehicle front-rear direction of the gear mechanism 84 of the drive mechanism 76 and the protruding portion (the base end side portion of the cylinder 64, the gas generator 68 and the cap 72) of the switching mechanism 54 toward the drive mechanism 76 is overlapped. Can be small.

  As described above, even when the driving mechanism 76 and the switching mechanism 54 are provided in the webbing take-up device 10, it is possible to suppress an increase in size of the physique of the webbing take-up device 10 in the vertical direction and the vehicle front-rear direction.

  Further, the connector 70 and the motor connector 82 are disposed adjacent to each other outside the leg plate 12C of the frame 12. Moreover, the space 100 is opened to the center pillar installation hole side and the connector 70A is opened to the center pillar installation hole side so that the connection hole 72A on the bottom wall of the cap 72 is inserted into the connector 70. 70A is opened toward the installation hole side of the center pillar, and the insertion port 82A of the motor connector 82 is directed toward the installation hole side of the center pillar. Therefore, the vehicle-side connector and the vehicle-side motor connector can be easily (together and efficiently) connected to the connector 70 and the motor connector 82 from the vehicle compartment side through the center pillar installation hole, respectively. The connector 82 can be easily electrically connected to the control device 74.

  Moreover, the insertion port 70 </ b> A of the connector 70 and the insertion port 82 </ b> A of the motor connector 82 are arranged above the spool 16. Therefore, the vehicle-side connector and the vehicle-side motor connector can be easily connected to the connector 70 and the motor connector 82 from above the spool 16, respectively, and the connector 70 and the motor connector 82 can be more easily and electrically connected to the control device 74. Can connect.

  Further, an extension plate 12D is formed integrally with the leg plate 12C of the frame 12, and a cylinder 64, a pawl 60, a piston 66, and a gas generator 68 of the force limiter mechanism 20 are disposed on the side of the extension plate 12D. The motor 80 of the drive mechanism 76 is fixed to the extension plate 12D. For this reason, the extension plate 12D can receive pressure (impact) from the force limiter mechanism 20 when the gas generator 68 is operated, and can also apply pressure (vibration, etc.) from the drive mechanism 76 when the motor 80 is driven. Therefore, the deformation of the body 56 of the force limiter mechanism 20 and the case 78 of the drive mechanism 76 can be suppressed. Thus, the deformation of the body 56 and the case 78 can be suppressed without providing the extension plate 12D separately from the leg plate 12C and increasing the number of parts.

  In the present embodiment, the insertion port 70A of the connector 70 and the insertion port 82A of the motor connector 82 are disposed above the spool 16, but the insertion port 70A of the connector 70 and the insertion port 82A of the motor connector 82 are provided. At least one of the above may be arranged above the central axis of the spool 16.

  Further, in the present embodiment, the switching mechanism 54 of the drive mechanism 76 and the force limiter mechanism 20 is provided in the webbing take-up device 10, but the switching mechanism 54 of the drive mechanism 76 and the force limiter mechanism 20 is provided in the webbing take-up device 10. At least one may not be provided. Further, even when the webbing take-up device 10 is not provided with the drive mechanism 76, the webbing take-up device 10 according to the present embodiment and a portion other than the drive mechanism 76 (including the switching mechanism 54 of the force limiter mechanism 20) can be shared. Even when the switching mechanism 54 of the force limiter mechanism 20 is not provided in the webbing take-up device 10, portions (including the drive mechanism 76) other than the webbing take-up device 10 and the switching mechanism 54 of the present embodiment can be shared.

DESCRIPTION OF SYMBOLS 10 Webbing winding device 16 Spool 18 Webbing 20 Force limiter mechanism 68 Gas generator (fluid generating means)
70 connector 70A socket (connection part)
80 Motor 86 1st gear (reduction gear)
88 Second gear (reduction gear)
90 3rd gear (reduction gear)
92 4th gear (reduction gear)
94 5th gear (reduction gear)
96 6th gear (reduction gear)
98 Clutch gear (reduction gear)
100 space L connecting line

Claims (2)

A webbing to be mounted on an occupant is wound, the webbing is wound by being rotated in the winding direction, and the spool is rotated in the pulling direction by being pulled out,
A motor for generating power;
A connecting line that connects at least a part of the central axis line in the orthogonal direction is arranged in a bent state so that a space is formed between at least a part, and the power generated by the motor is decelerated and transmitted to the spool. A plurality of reduction gears on which the spool is rotated,
A force limiter mechanism that allows the webbing to be pulled out from the spool beyond the force limiter load by being actuated;
A fluid generating means that is inserted into the space and in which the plurality of reduction gears are arranged within a range of a protruding width in the spool axial direction, and the force limiter load is switched by generating fluid;
A webbing take-up device comprising:   The connector is provided in the fluid generating means and provided with a connection portion and electrically connected from the connection portion, and the space is opened to the inside of the vehicle so that the connection portion is directed to the inside of the vehicle. The webbing take-up device according to claim 1.

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