JP2017047783A - Seat belt retractor and seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt retractor and a seat belt device which can change energy absorption characteristic in a stepless manner and improve performance of the energy absorption characteristic.SOLUTION: A seat belt retractor comprises a spool, a shaft, a rocking base, and an energy absorption device. The energy absorption device comprises: a spool side component rotating in conjunction with the spool; a rocking base side component configured to be rotatable in conjunction with the rocking base; and a resistor for generating drag by relative rotation generated between the spool side component and the rocking base side component. The spool side component includes a casing 5d for storing the resistor and the rocking base side component. The casing 5d has a pair of radial bearing parts (a first radial bearing part 5e, a second radial bearing part 5f) on both sides across the resistor.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seat belt retractor and a seat belt device, and more particularly, to a seat belt retractor and a seat belt device provided with an energy absorbing device disposed between relatively rotating objects.

  For example, in a winding device (including a rewinding function) for a long object such as a seat belt retractor, a winding drum (also referred to as a drum or a spool) for winding a long object is used. It is rotating relative to the support means for rotatably supporting the barrel. When a long object is fully extended in a device that performs such relative rotation, or when the winding drum stops during winding or rewinding, a large load is applied to the device or the long object. It is preferable to arrange an energy absorbing device between the objects.

  For example, Patent Literature 1 discloses a vehicle force limiter device in which a ring disk (1, 3) and a swing member (2) are arranged between relatively rotating objects. According to such a device, when the swing member (2) rotates relative to the ring disc (1, 3), the protrusion (5) formed on the swing member (2) is caused to move to the ring disc (1, 3). ), The energy generated between the relatively rotating objects can be absorbed. In particular, in this apparatus, the kinetic energy varies depending on the rotational speed of the swing member (2), and the amount of energy absorption can be increased as the rotational speed of the swing member (2) increases.

International Publication 2012/059166

  By the way, when the energy absorbing device described in Patent Document 1 described above operates, the spool (shaft) is strongly pulled in the pull-out direction by the webbing. Therefore, when the energy absorbing device is operated, the spool (shaft) rotates in the pulling direction while being curved in the pulling direction.

  However, the energy absorbing device described in Patent Document 1 has a configuration in which a rocking member is disposed between a pair of ring disks. When the spool (shaft) is curved, the energy absorbing device is arranged between the ring disk and the rocking member. As a result, axial misalignment occurs, leading to a decrease in performance of energy absorption characteristics.

  The present invention has been made in view of such problems, and provides a seat belt retractor and a seat belt device that can change the energy absorption characteristics steplessly and can improve the performance of the energy absorption characteristics. For the purpose.

  According to the present invention, a spool that winds up a webbing that restrains an occupant, a shaft that is inserted through an axis of the spool, and a locking base that is connected to the shaft and can be switched between a rotating state and a non-rotating state. A seat belt retractor comprising: an energy absorbing device disposed between the spool and the locking base; wherein the energy absorbing device is a spool side component that rotates in conjunction with the spool; and the locking base A locking base-side component configured to be rotatable in conjunction with the spool, and a resistor that generates a drag force by relative rotation generated between the spool-side component and the locking base-side component. A side component is a casing that houses the resistor and the locking base component Wherein, the casing includes the resistor pair of radial bearing portions on both sides of the seat belt retractor is provided, characterized in that.

  According to the present invention, the webbing that restrains the occupant to the seat, the seat belt retractor that winds the webbing, the belt anchor that fixes the webbing to the vehicle body side, and the buckle that is disposed on the side surface of the seat And a tong disposed on the webbing, wherein the seatbelt retractor includes a spool for winding the webbing, a shaft inserted through an axis of the spool, and the shaft A locking base connected and switchable between a rotating state and a non-rotating state; and an energy absorbing device disposed between the spool and the locking base, wherein the energy absorbing device is interlocked with the spool. Rotating spool side component and configured to rotate in conjunction with the locking base A locking base side component, and a resistor that generates a drag force by relative rotation generated between the spool side component and the locking base side component, the spool side component being the resistor And a casing that accommodates the locking base side component, and the casing has a pair of radial bearing portions on both sides of the resistor, and provides a seat belt device.

  In the seat belt retractor and the seat belt apparatus described above, the casing includes a housing capable of accommodating the resistor and the locking base side components, and a cover plate connected to the housing, and is formed in the housing. You may have the made 1st radial bearing part and the 2nd radial bearing part formed in the said cover plate.

  The locking base side component may be connected to the locking base via a fixing ring, and the radial bearing portion may be formed on a contact surface with the fixing ring.

  According to the above-described seat belt retractor and seat belt device according to the present invention, the resistor is disposed between the spool side component and the locking base side component, so that the spool side component and the locking base side component are The relative rotational kinetic energy generated during the period can be converted into a drag (for example, inertial force, frictional force, etc.), and the energy absorption characteristics can be changed steplessly.

  Moreover, in this invention, even if it is a case where a spool (shaft) curves by arrange | positioning the radial bearing part at the both ends of the casing which comprises an energy absorption apparatus, a spool side structural component and a locking base side structural component Axial misalignment can be suppressed and the performance of energy absorption characteristics can be improved.

It is an axial sectional view showing a seat belt retractor concerning one embodiment of the present invention. FIG. 2 is a part development view showing a shaft unit of the seat belt retractor shown in FIG. 1. It is an enlarged view of the radial bearing part shown in FIG. It is a whole lineblock diagram showing the seat belt device concerning this embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is an axial sectional view showing a seat belt retractor according to an embodiment of the present invention. FIG. 2 is a part development view showing a shaft unit of the seat belt retractor shown in FIG. FIG. 3 is an enlarged view of the radial bearing portion shown in FIG.

  A seat belt retractor 1 according to an embodiment of the present invention is inserted through a spool 2 that winds up a webbing W that restrains an occupant and an axis of the spool 2, as shown in FIGS. A shaft 3, a locking base 4 connected to the shaft 3 and capable of switching between a rotating state and a non-rotating state, and an energy absorbing device 5 disposed between the spool 2 and the locking base 4. The apparatus 5 includes a spool-side component 5a that rotates in conjunction with the spool 2, a locking base-side component 5b that is configured to rotate in conjunction with the locking base 4, and a spool-side component 5a and a locking base-side component. A resistor 5c that generates a drag force by relative rotation generated between the component 5b and the spool side component 5a. The casing 5d includes a casing 5d that accommodates the base component 5b. The casing 5d has a pair of radial bearings (a first radial bearing 5e and a second radial bearing 5f) on both sides of the resistor 5c. . In FIG. 1, the illustration of the webbing W is omitted for convenience of explanation.

  The illustrated seat belt retractor 1 includes a base frame 11 having a square U-shaped section that rotatably accommodates the spool 2, a spring unit 12 disposed at one end of the shaft 3, and a conventional seat belt retractor. A lock mechanism 13 disposed at the other end of the shaft 3, a vehicle sensor 14 that detects vehicle acceleration, and the spool 2 is rotated in the event of a vehicle collision or the like to wind up the webbing W to create a gap between the occupant and the webbing W. And the pretensioner 15 to be eliminated. Note that the pretensioner 15 can be omitted as necessary. Moreover, the shaft 3 is comprised by the torsion bar, for example.

  As shown in FIG. 1, the spring unit 12 includes a spring core 12 a that forms the axis of a spiral spring (not shown), and a spring cover 12 b that houses the spiral spring. One end of the shaft 3 is connected to the spring core 12a.

  As shown in FIGS. 1 and 2, the locking mechanism 13 includes a locking base 4 disposed at an end portion of the shaft 3, a pawl 13 a that is swingably disposed on the locking base 4, and an outer side of the locking base 4. A lock gear 13b disposed at the end of the shaft 3 so as to be adjacent to the flywheel, a flywheel 13c disposed so as to be able to swing on the lock gear 13b, and housing these components and rotatably supporting the shaft 3 And a retainer 13d.

  As shown in FIG. 1, the vehicle sensor 14 is disposed adjacent to the lock mechanism 13, and is formed on the outer periphery of the lock gear 13b when detecting acceleration generated in the vehicle due to a vehicle collision or the like. It has an actuator 14a that engages with the teeth.

  When the vehicle sensor 14 detects acceleration generated in the vehicle due to a vehicle collision or the like, the rotation of the lock gear 13b is restricted by the actuator 14a. Further, when the webbing W is pulled out rapidly, the flywheel 13c is swung by the inertial force and engaged with the teeth formed on the inner peripheral surface of the retainer 13d, and the rotation of the lock gear 13b is restricted. . When the rotation of the lock gear 13 b is restricted, the pawl 13 a swings and protrudes in the outer diameter direction of the locking base 4 and engages with teeth formed in the opening of the base frame 11. The locking base 4 is fixed (restrained) to the base frame 11 by the engagement of the pawl 13a.

  Even when a load is applied in the direction in which the webbing W is pulled out in a state in which the lock mechanism 13 is activated, the spool 2 remains on the shaft 3 (torsion bar) until a load exceeding a threshold value is generated on the shaft 3 (torsion bar). ) Is connected to the locking base 4 through the non-rotating state. When the shaft 3 (torsion bar) has a load exceeding the threshold value, the shaft 3 (torsion bar) is twisted to cause the spool 2 to rotate relative to the locking base 4 and webbing. W is withdrawn.

  The shaft 3 may have a stopper 3a that defines the maximum torsional rotation speed of the torsion bar. For example, the stopper 3 a is inserted into the outer periphery of the shaft portion of the locking base 4. The pull-out amount of the webbing W is regulated by the stopper 3a. Further, a collar 3b for preventing backlash may be disposed between the stopper 3a and the spool 2. Although not shown, the shaft 3 is not limited to the torsion bar, and an EA plate (energy absorbing plate) that allows relative rotation with the spool 2 may be disposed on the rigid shaft 3.

  For example, as shown in FIG. 1, the pretensioner 15 includes a pinion 15a that is inserted through the shaft 3 and arranged on a concentric shaft, a ring gear 15b having internal teeth that can be engaged with the pinion 15a, and a ring gear 15b. And a cover 15c that covers the outer periphery of the ring gear 15b. The power generation means includes, for example, a mass body (not shown) that engages and rotates with the outer periphery of the ring gear 15b, a pipe 15d that accommodates the mass body in a releasable manner, and a gas generator that applies power to the mass body ( (Not shown).

  Normally, the pinion 15a and the ring gear 15b are separated from each other. When a mass body is released from the pipe 15d at the time of a vehicle collision, the ring gear 15b meshes with the pinion 15a by the movement of the mass body, and the ring gear 15b The pinion 15a is rotated by the rotation, and the spool 2 is rotated in the winding direction of the webbing W.

  As shown in FIG. 2, the pinion 15 a has a bearing portion 15 e that extends inward and is fitted to the shaft 3, and the bearing portion 15 e is fitted into an opening formed in the spool 2. . Therefore, one end of the shaft 3 is connected to the spool 2 via the bearing portion 15e of the pinion 15a. The pinion 15a may be positioned in the axial direction by a push nut 15f.

  The configuration of the above-described seat belt retractor 1 has substantially the same configuration as the conventional seat belt retractor described in, for example, Japanese Patent Application Laid-Open No. 2012-30636, and the detailed description thereof is omitted. . In the seat belt retractor 1 according to the present embodiment, the energy absorbing device 5 is disposed between the spool 2 and the locking base 4 as shown in FIGS.

  The energy absorbing device 5 is, for example, an energy absorbing device disposed between relatively moving objects as shown in FIGS. 1 to 2, and is integrally formed at the end of the spool 2. A housing 51 having a bottom surface having a corrugated groove 51a formed in an annular shape, a cover plate 52 having a corrugated groove 52a connected to the housing 51 and synchronized with the corrugated groove 51a of the housing 51, and one end thereof A plurality of drive pins 53 inserted into the corrugated grooves 51 a of the housing 51 and the other end inserted into the corrugated grooves 52 a of the cover plate 52, a plurality of mass bodies 54 disposed in each intermediate portion of the drive pins 53, and the drive pins 53 and a pair of intermediate plates 55 which are disposed on both sides of the mass body 54 and connected to the locking base 4. In addition, a guide ring 56 that guides movement in the radial direction of the mass body 54 may be disposed inside the mass body 54.

  In the illustrated energy absorbing device 5, the housing 51 is formed integrally with the spool 2. However, the housing 51 and the spool 2 may be formed separately and connected. As shown in FIG. 2, the bottom surface of the housing 51 is constituted by a corrugated groove plate 51b having a corrugated groove 51a, and may be constituted by another part. Although not shown, the corrugated groove 51 a may be formed directly on the bottom surface of the housing 51.

  In the present embodiment, the casing 5d is configured by a housing 51 and a cover plate 52, and the housing 51 is configured to accommodate the resistor 5c (the drive pin 53 and the mass body 54) and the locking base side component 5b. The cover plate 52 is configured to be connectable to the housing 51. The cover plate 52 may be fixed to the housing 51 by caulking or the like.

  Further, the intermediate plate 55 and the guide ring 56 are fixed to the locking base 4 via a fixing ring 57 and a connecting ring 58. An opening having engaging teeth (for example, internal teeth 55b) is formed at the center of the intermediate plate 55 and the guide ring 56, and the shaft portion 57a of the fixing ring 57 is engaged with the engaging teeth in this opening. It is inserted to match.

  The fixing ring 57 includes a shaft portion 57 a that is screwed into the shaft portion 4 a of the locking base 4, and a flange portion 57 b that restricts the movement of the cover plate 52 in the axial direction. Engagement teeth are formed on the outer peripheral surface of the shaft portion 57 a to engage with engagement teeth formed in the openings of the intermediate plate 55 and the guide ring 56. Further, a female screw is cut on the inner peripheral surface of the shaft portion 57 a and is configured to be screwable with a male screw cut on the outer peripheral surface of the shaft portion 4 a of the locking base 4. A recess 57c that can accommodate the connecting ring 58 is formed at the inner edge of the flange portion 57b.

  The connection ring 58 is an annular component having a convex portion 58 a that can be engaged with the concave portion 57 c of the fixing ring 57 and a concave portion 58 b that can be engaged with the locking base 4. By inserting the connecting ring 58 between the fixing ring 57 and the locking base 4, these components can be mechanically firmly connected. The connecting ring 58 can be omitted as necessary, and the fixing ring 57 may be directly fixed to the locking base 4.

  The drive pin 53 may be made of metal or resin. The mass body 54 is made of, for example, a metal such as lead or iron. Further, since the mass body 54 reciprocates in the radial direction of the spool 2 when the drive pin 53 moves along the corrugated groove 51a and the corrugated groove 52a, as shown in FIG. Placed in. The mass body 54 has, for example, a substantially trapezoidal shape in which the inside is narrow and the outside is wide as a whole, and includes a protruding portion 54a protruding inward. The protrusion 54 a is inserted into a groove formed on the outer periphery of the guide ring 56.

  As shown in FIG. 2, in the present embodiment, the drive pin 53 and the mass body 54 are configured separately, and the drive pin 53 is inserted through a through hole formed in the mass body 54. At this time, the drive pin 53 may be press-fitted into the through hole of the mass body 54 or may be inserted into the through hole of the mass body 54 in a loose fit. Although not shown, the drive pin 53 and the mass body 54 may be integrally formed by die casting or the like.

  When the drive pin 53 is press-fitted into the mass body 54 or when the drive pin 53 and the mass body 54 are integrally formed, the drive pin 53 can be fixed to the mass body 54, and the corrugated groove 51a and the corrugated groove 52a. The rotation (spinning) of the drive pin 53 that moves can be suppressed. Therefore, energy can be absorbed by the drag (inertial force, frictional force, etc.) generated with the movement of the drive pin 53 and the mass body 54. The drive pin 53 may be inserted into the mass body 54 in a loose fit.

  The intermediate plate 55 is an annular component having a plurality of long holes 55 a through which the drive pins 53 are inserted and internal teeth 55 b that engage with the shaft portion 57 a of the fixing ring 57. By disposing the intermediate plate 55 at both ends of the drive pin 53, a load can be applied to the drive pin 53 in a balanced manner, and the occurrence of stress concentration can be mitigated. The long hole 55a has a major axis arranged along the radial direction, and the length is designed to be larger than the amplitude of the corrugated groove 51a and the corrugated groove 52a.

  Here, in this embodiment, the “corrugated groove” means a groove formed so as to meander in the circumferential direction. “Synchronized” means that the corrugated groove 51a and the corrugated groove 52a have the same amplitude in the same phase. In the present embodiment, the spool-side component 5 a is configured by the housing 51, the corrugated groove plate 51 b, and the cover plate 52. The locking base-side component 5b includes a pair of intermediate plates 55, a guide ring 56, a fixing ring 57, and a connecting ring 58. Further, the resistor 5 c is configured by a drive pin 53 and a mass body 54.

  In the energy absorbing device 5 described above, it is assumed that the locking mechanism 13 is now operated and the locking base 4 is fixed to the base frame 11. At this time, since the spool 2 is connected to the locking base 4 via the shaft 3, it is held in a non-rotating state. For example, when a load is applied in a direction in which the occupant moves forward and pulls out the webbing W, the shaft 3 is constituted by a torsion bar in the present embodiment, and thus a load of a predetermined threshold value or more is generated on the shaft 3. Until then, the spool 2 is held in a non-rotating state.

  And when the load beyond a predetermined threshold arises in the shaft 3, when the shaft 3 twists, the spool 2 will produce a rotational motion relatively with respect to the locking base 4, and the webbing W will be pulled out. The relative rotational movement of the spool 2 causes a relative rotational movement between the spool-side component 5a and the locking base-side component 5b of the energy absorbing device 5, and the drive pin 53 is connected to the corrugated groove 51a and It moves along the corrugated groove 52a. At this time, the mass body 54 rotates (revolves) in conjunction with the drive pin 53 while reciprocating in the radial direction.

  The masses of the drive pin 53 and the mass body 54 are arbitrarily designed according to the predicted value of the acceleration generated in the webbing W. Further, the acceleration generated in the occupant at the time of a vehicle collision, that is, the acceleration generated in the webbing W tends to increase with time. If the mass is the same, the amount of energy input from the spool 2 depends on the magnitude of the acceleration. The amount of absorption can be varied. In addition, the acceleration generated in the webbing W varies depending on the physique difference (weight difference) of the occupant. In this case as well, the energy absorption amount of the energy absorbing device 5 can be varied according to the magnitude of the acceleration. . That is, according to the energy absorbing device 5 described above, the energy absorption characteristics can be changed steplessly.

  During the operation of the energy absorbing device 5, a high load is applied to the shaft 3 by the tension of the webbing W, and the shaft 3 is curved in the pulling-out direction of the webbing W. On the other hand, the energy absorbing device 5 needs to move (revolve) the resistor 5c between the housing 51 including the corrugated groove 51a and the cover plate 52 including the corrugated groove 52a. In order to maintain the absorption characteristics, it is important to maintain the parallelism between the corrugated groove 51a and the intermediate plate 55 and the parallelism between the corrugated groove 52a and the intermediate plate 55. That is, it is necessary to maintain the parallelism between the spool-side component 5a and the locking base-side component 5b (or to suppress axial misalignment).

  As shown in FIG. 3, the seat belt retractor 1 according to the present embodiment includes a first radial bearing portion 5 e formed on the housing 51 and a second radial bearing portion 5 f formed on the cover plate 52. doing. As described above, the locking base side component 5b is connected to the locking base 4 via the fixing ring 57. The first radial bearing portion 5e and the second radial bearing portion 5f are, for example, illustrated in FIG. As shown, a contact surface with the fixing ring 57 is formed. In FIG. 3, the illustration of the shaft 3 and the locking base 4 is omitted for convenience of explanation. A one-dot chain line L indicates a center line of the shaft 3.

  Specifically, as shown in FIG. 3, a concave portion that is slidably inserted into the tip end portion of the shaft portion 57 a of the fixing ring 57 is formed in the inner edge portion of the housing 51. It has the annular wall 51c arrange | positioned along the outer peripheral surface of the part 57a, and the opposing wall 51d arrange | positioned facing the front-end | tip part of the axial part 57a. The first radial bearing portion 5e is configured by the annular wall 51c. Moreover, you may make it comprise the thrust bearing part 5g by 51d of opposing walls.

  Further, a convex portion is formed on the inner edge portion of the cover plate 52 so as to be slidably inserted into the outer peripheral portion of the flange portion 57b of the fixing ring 57. The recess 57d is formed. The convex part formed in the inner edge part of the cover plate 52 has the annular wall 52b arrange | positioned along the outer peripheral surface of the recessed part 57d. The annular wall 52b constitutes the second radial bearing portion 5f. As shown in the figure, dust and the like can be prevented from being mixed by covering the opening of the cover plate 52 with the flange portion 57b.

  The first radial bearing portion 5e and the second radial bearing portion 5f are configured to receive a radial load generated in the radial direction of the shaft 3, and are particularly close to both axial ends of the energy absorbing device 5. Formed in position. Therefore, even when the shaft 3 is bent during the operation of the energy absorbing device 5, the radial load can be received by the first radial bearing portion 5e and the second radial bearing portion 5f. Can follow. Therefore, the parallelism between the corrugated groove 51a and the intermediate plate 55 and the parallelism between the corrugated groove 52a and the intermediate plate 55, that is, the parallelism between the spool side component 5a and the locking base side component 5b can be maintained. . In other words, axial misalignment between the spool-side component 5a and the locking base-side component 5b can be suppressed.

  In the embodiment described above, the annular wall 51c constituting the first radial bearing portion 5e is formed in a concave shape, but may be formed in a convex shape like the second radial bearing portion 5f. At this time, a corresponding recess is formed at the tip of the shaft portion 57a of the receiving-side fixing ring 57.

  Similarly, in the embodiment described above, the annular wall 52b constituting the second radial bearing portion 5f is formed in a convex shape, but it is formed in a concave shape like the first radial bearing portion 5e. May be. At this time, a corresponding convex portion is formed on the outer peripheral portion of the flange portion 57b of the fixing ring 57 on the receiving side.

  In the above-described embodiment, the first radial bearing portion 5e and the second radial bearing portion 5f are configured by contact surfaces with the fixing ring 57. For example, the fixing ring 57 is formed integrally with the locking base 4. In such a case, the first radial bearing portion 5e and the second radial bearing portion 5f may be configured by contact surfaces with the locking base 4.

  Next, the seatbelt apparatus 101 provided with the seatbelt retractor 1 described above will be described with reference to FIG. Here, FIG. 4 is an overall configuration diagram illustrating the seat belt device according to the present embodiment.

  A seat belt device 101 shown in FIG. 4 guides the webbing W provided on the vehicle body side, a webbing W that restrains an occupant (not shown) to the seat S, a seat belt retractor 1 that winds the webbing W, and the like. The seat belt retractor 1 includes a guide anchor 102, a belt anchor 103 for fixing the webbing W to the vehicle body side, a buckle 104 disposed on the side surface of the seat S, and a tongue 105 disposed on the webbing W. 1 is a seat belt retractor 1 according to the embodiment.

  The illustrated seat belt device 101 is a so-called passenger seat belt device, and a pillar P is often disposed at a position adjacent to the seat S. For example, the seat belt retractor 1 is disposed in the pillar P, and the guide anchor 102 is disposed on the surface of the pillar P. In the seat belt device 101, the occupant can be restrained to the seat S by the webbing W by pulling out the webbing W and fitting the tongue 105 to the buckle 104.

  Since the configuration of the seat belt device 101 other than the seat belt retractor 1 is the same as that of the conventional seat belt device, detailed description thereof is omitted here. The seat belt device 101 is not limited to the one for the passenger seat, and may be a seat belt device for a driver's seat or a seat belt device for a rear seat. In the seat belt device for the rear seat, the guide anchor 102 may be omitted.

  The present invention is not limited to the above-described embodiment. For example, the energy absorption device 5 may be an energy absorption device other than the configuration described above, and various modifications can be made without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 1 Seat belt retractor 2 Spool 3 Shaft 3a Stopper 3b Collar 4 Locking base 4a Shaft part 5 Energy absorber 5a Spool side component 5b Locking base side component 5c Resistor 5d Casing 5e First radial bearing part 5f Second radial bearing part 5g Thrust bearing portion 11 Base frame 12 Spring unit 12a Spring core 12b Spring cover 13 Lock mechanism 13a Pawl 13b Lock gear 13c Flywheel 13d Retainer 14 Vehicle sensor 14a Actuator 15 Pretensioner 15a Pinion 15b Ring gear 15c Cover 15d Pipe 15e Bearing portion 15f Push nut 51 Housing 51a, 52a Corrugated groove 51b Corrugated groove plate 51c, 52b Annular wall 51d Opposing wall 52 Bar plate 53 Drive pin 54 Mass 54a Protruding part 55 Intermediate plate 55a Long hole 55b Internal tooth 56 Guide ring 57 Fixing ring 57a Shaft part 57b Flange part 57c Concave part 57d Concave ring 58a Convex part 58b Concave part 101 Seat belt device 102 Guide Anchor 103 Belt anchor 104 Buckle 105 Tongue

Claims (4)

A spool that winds up a webbing that restrains an occupant, a shaft that is inserted through an axis of the spool, a locking base that is connected to the shaft and can be switched between a rotating state and a non-rotating state, the spool and the locking In a seat belt retractor comprising an energy absorbing device disposed between the base and
The energy absorber includes a spool-side component that rotates in conjunction with the spool, a locking base-side component that is configured to rotate in conjunction with the locking base, the spool-side component, and the locking base side A resistor that generates a drag force by relative rotation generated between the component parts,
The spool side component includes a casing that houses the resistor and the locking base side component, and the casing includes a pair of radial bearing portions on both sides of the resistor.
A seat belt retractor characterized by that.   The casing includes a housing capable of housing the resistor and the locking base side component, a cover plate connected to the housing, a first radial bearing portion formed in the housing, and the cover The seat belt retractor according to claim 1, further comprising a second radial bearing portion formed on the plate.   The locking base side component is connected to the locking base via a fixing ring, and the radial bearing portion is formed on a contact surface with the fixing ring. The seat belt retractor according to 1. A webbing that restrains an occupant to a seat, a seat belt retractor that winds the webbing, a belt anchor that fixes the webbing to a vehicle body side, a buckle that is disposed on a side surface of the seat, and a webbing that is disposed on the webbing In a seat belt device comprising a tongue,
The seat belt device according to any one of claims 1 to 3, wherein the seat belt retractor is the seat belt retractor.