JP6596274B2 - Seat belt retractor and seat belt device - Google Patents

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. An energy absorbing device disposed between the spool and the locking base, wherein the energy absorbing device is integrally formed on the concentric shaft at the end of the spool. A housing having a bottom surface having a corrugated groove formed in an annular shape, a cover plate having a corrugated groove that is connected to the housing and is synchronized with the corrugated groove of the housing, and one end of the housing has a corrugated groove A plurality of drive pins inserted into the corrugated groove of the cover plate and the other ends thereof, and intermediate portions of the drive pins A plurality of arranged mass bodies, a pair of intermediate plates that are inserted on both sides of the mass body through which the drive pin is inserted and connected to the locking base, and between the intermediate plate and the locking base There is provided a seat belt retractor comprising: a fixing ring disposed; and the intermediate plate having an outer peripheral surface that contacts the inner peripheral surface of the casing so as to be centerable.

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, the energy absorbing device at an end of the spool Provided with a bottom surface that is formed integrally on the concentric shaft and has a wave groove formed in an annular shape A cover plate having a corrugated groove connected to the housing and facing the housing and synchronized with the corrugated groove of the housing; and one end inserted into the corrugated groove of the housing and the other end into the corrugated groove of the cover plate A plurality of inserted drive pins, a plurality of mass bodies disposed at respective intermediate portions of the drive pins, and a pair of the drive pins inserted and disposed on both sides of the mass body and connected to the locking base An intermediate plate, and a fixing ring disposed between the intermediate plate and the locking base, and the intermediate plate has an outer peripheral surface that contacts the inner peripheral surface of the casing so as to be centered . A seat belt device is provided.

Seat belt retractor and seat belt apparatus odor mentioned above Te, before Symbol intermediate plate has an opening with internal teeth in the center, the fixing ring is provided with the internal teeth engageable with teeth It may have a shaft part. Further, the inner teeth and the engaging teeth may have a contact portion that has a clearance in the radial direction and contacts in the circumferential direction. The casing may have a pair of radial bearing portions on both sides of the resistor.

  According to the seat belt retractor and the seat belt device according to the present invention described above, the relative rotation generated between the spool and the locking base by arranging the energy absorbing device having a resistor between the spool and the locking base. Kinetic energy can be converted into drag (for example, inertial force, frictional force, etc.), and the energy absorption characteristics can be changed steplessly.

  Further, in the present invention, since the center plate arranged in the casing is centered on the outer peripheral surface of the intermediate plate, the energy absorbing device can be used even when the spool (shaft) is about to bend. The parallelism of the main components (casing, resistor, intermediate plate) to be configured can be maintained, and the energy absorption characteristics of the energy absorbing device can be improved.

It is a figure which shows the seatbelt retractor which concerns on one Embodiment of this invention, (A) is an axial sectional view, (B) is a BB arrow sectional drawing in FIG. 1 (A). FIG. 2 is a part development view showing a shaft unit of the seat belt retractor shown in FIG. 1. It is the elements on larger scale of the energy absorber shown in FIG. It is explanatory drawing which shows the engagement state of an intermediate | middle plate and a power transmission member. It is a conceptual diagram which shows the effect of the seatbelt retractor shown in FIG. 1, (A) is a normal state of this embodiment, (B) is an overload state of this embodiment, (C) is a normal state of a comparative example, (D) shows the overload state of the comparative example. It is a whole lineblock diagram showing the seat belt device concerning this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a view showing a seat belt retractor according to an embodiment of the present invention, in which (A) is an axial sectional view, and (B) is a sectional view taken along line BB in FIG. 1 (A). . FIG. 2 is a part development view showing a shaft unit of the seat belt retractor shown in FIG. FIG. 3 is a partially enlarged view of the energy absorbing device shown in FIG.

  A seat belt retractor 1 according to an embodiment of the present invention includes, for example, a spool 2 that winds up a webbing W that restrains an occupant and an axial center of the spool 2 as illustrated in FIGS. A shaft 3 inserted into the 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 energy absorbing device 5 includes a casing 51 fixed to the spool 2, a resistor 52 arranged in the casing 51, an intermediate plate 53 arranged to be interlocked with the resistor 52, an intermediate plate 53, and a locking base 4, the spool 2, the casing 51, and the intermediate plate 53 are disposed on a concentric shaft, During plate 53 is provided with an outer peripheral surface 53c that contacts to be centering on the inner peripheral surface of the casing 51. Note that the webbing W is not shown in FIGS. 1A and 1B 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 this 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 rotating objects, and is integrally formed on the concentric shaft at the end of the spool 2 and has a wave shape formed in an annular shape. A housing 511 having a bottom surface having a groove 511a, a cover plate 512 having a corrugated groove 512a connected to the housing 511 and synchronized with the corrugated groove 511a of the housing 511, and one end of the corrugated groove 511a of the housing 511 The other end of the drive pin 521 is inserted into the corrugated groove 512a of the cover plate 512, the plurality of mass bodies 522 disposed at each intermediate portion of the drive pin 521, and the drive pin 521 is inserted into the mass. A pair of intermediate plates 53 disposed on both sides of the body 522 and connected to the locking base 4; It has a fixing ring 541 which is arranged between the rate 53 and the locking base 4. A guide ring 523 that guides the movement of the mass body 522 in the radial direction may be disposed inside the mass body 522.

  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 511a and the corrugated groove 512a have the same amplitude in the same phase.

  In the illustrated energy absorbing device 5, the housing 511 is formed integrally with the spool 2. However, the housing 511 and the spool 2 may be formed separately and connected. The housing 511 has a substantially bottomed cylindrical shape, and a space for housing components such as the resistor 52 is formed by connecting the cover plate 512 to the opening side. That is, in the present embodiment, the casing 51 is configured by the housing 511 and the cover plate 512. It should be noted that the positional relationship between the housing 511 and the cover plate 512 may be switched so that the cover plate 512 is connected to the spool 2.

  Further, as shown in FIG. 2, a corrugated groove 511 a is formed directly on the bottom surface of the housing 511. The corrugated groove 511 a may be formed in an annular metal plate that is a separate part from the housing 511, and this metal plate may be disposed on the bottom surface of the housing 511. An opening 512b through which the locking base 4 can be inserted is formed at the center of the cover plate 512. Further, as shown in FIG. 1A, the corrugated groove 512a is formed directly on the inner surface of the cover plate 512. However, similar to the corrugated groove 511a, the corrugated groove is formed on another annular metal plate. 512a may be formed.

  The drive pin 521 may be made of metal or resin. The mass body 522 is made of a metal such as lead or iron, for example. Further, since the mass body 522 is reciprocated in the radial direction of the spool 2 when the drive pin 521 moves along the corrugated groove 511a and the corrugated groove 512a, as shown in FIG. Placed in. The mass body 522 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 522a protruding inward.

  The guide ring 523 has a plurality of groove portions 523a formed on the outer periphery and inner teeth 523b formed on the inner periphery. The groove 523a is inserted into the protrusion 522a of the mass body 522, and the internal teeth 523b are configured to engage with the fixing ring 541.

  As shown in FIG. 2, in the present embodiment, the drive pin 521 and the mass body 522 are configured separately, and the drive pin 521 is inserted through a through hole formed in the mass body 522. At this time, the drive pin 521 may be press-fitted into the through hole of the mass body 522 or may be inserted into the through hole of the mass body 522 in a loose fit. Although not shown, the drive pin 521 and the mass body 522 may be integrally formed by die casting or the like.

  When the drive pin 521 is press-fitted into the mass body 522, or when the drive pin 521 and the mass body 522 are integrally formed, the drive pin 521 can be fixed to the mass body 522, and the corrugated groove 511a and the corrugated groove 512a. Rotation (spinning) of the drive pin 521 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 521 and the mass body 522. That is, in this embodiment, the resistor 52 is configured by the drive pin 521 and the mass body 522.

  The intermediate plate 53 is an annular component having a plurality of long holes 53 a through which the drive pins 521 are inserted and internal teeth 53 b that engage with the shaft portion 541 a of the fixing ring 541. By disposing the intermediate plate 53 at both ends of the drive pin 521, a load can be applied to the drive pin 521 in a balanced manner. The long hole 53a has a major axis arranged along the radial direction, and the length is designed to be larger than the amplitude of the corrugated groove 511a and the corrugated groove 512a.

  Further, as shown in FIG. 3, the intermediate plate 53 is configured such that the outer peripheral surface 53 c is slidably in contact with the inner peripheral surface 511 b of the housing 511. By this contact, the intermediate plate 53 is centered, and the casing 51 and the intermediate plate 53 are arranged on the concentric shaft. The outer peripheral surface 53c may be formed over the entire outer periphery of the intermediate plate 53, but is formed in at least three or more portions that are arranged substantially evenly along the outer periphery of the intermediate plate 53. Just do it.

  For example, as shown in FIG. 2, the fixing ring 541 is fixed to the locking base 4 via the connection ring 542. The fixing ring 541 includes a shaft portion 541 a that is screwed into the shaft portion 4 a of the locking base 4, and a flange portion 541 b that covers the opening 512 b of the cover plate 512. Engagement teeth that engage with the inner teeth 53b of the intermediate plate 53 and the inner teeth 523b of the guide ring 523 are formed on the outer peripheral surface of the shaft portion 541a. Further, a concave portion 541c capable of accommodating the connection ring 542 is formed on the inner edge portion of the flange portion 541b.

  The connection ring 542 is an annular component having a convex portion 542 a that can be engaged with the concave portion 541 c of the fixing ring 541 and a concave portion 542 b that can be engaged with the locking base 4. By inserting the connecting ring 542 between the fixing ring 541 and the locking base 4, these components can be mechanically firmly connected. The connecting ring 542 can be omitted as necessary, and the fixing ring 541 may be directly fixed to the locking base 4.

  With this configuration, the fixing ring 541 rotates integrally with the locking base 4, and the shaft portion 541 a is configured to transmit power by engaging the inner teeth 53 b of the intermediate plate 53 and the inner teeth 523 b of the guide ring 523. Has been. That is, in this embodiment, the power transmission member 54 is configured by the fixing ring 541 and the connection ring 542.

  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 casing 51 of the energy absorbing device 5 and the resistor 52, and the drive pin 521 moves along the corrugated groove 511a and the corrugated groove 512a. Will move. At this time, the mass body 522 rotates (revolves) in conjunction with the drive pin 521 while reciprocating in the radial direction.

  The masses of the drive pin 521 and the mass body 522 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 rotate the resistor 52 and the intermediate plate 53 between the housing 511 including the corrugated groove 511a and the cover plate 512 including the corrugated groove 512a. In order to maintain the energy absorption characteristics, it is important to maintain the parallelism of the main components (casing 51, resistor 52, intermediate plate 53).

  Here, FIG. 4 is an explanatory view showing an engaged state between the intermediate plate and the power transmission member. In FIG. 4, for convenience of explanation, only the inner edge portion of the intermediate plate 53 and the shaft portion 541 a of the fixing ring 541 constituting the power transmission member 54 are illustrated. As illustrated, inner teeth 53 b are formed on the inner peripheral surface of the intermediate plate 53, and engaging teeth 541 e are formed on the outer peripheral surface of the shaft portion 541 a of the fixing ring 541. The inner teeth 53b and the engaging teeth 541e have a clearance Δc in the radial direction and a contact portion 541f that contacts in the circumferential direction.

  Specifically, the inner teeth 53b and the engaging teeth 541e have opposing surfaces along the substantially radial direction, and the contact portion 541f is configured by these surfaces. Thus, by configuring the contact portion 541f between the inner teeth 53b and the engaging teeth 541e, power in the rotational direction (circumferential direction) can be transmitted. Further, the inner teeth 53b and the engaging teeth 541e have opposing surfaces along the substantially circumferential direction, and the clearance Δc is configured by preventing these surfaces from contacting each other.

  Even if a force for bending the spool 2 (shaft 3) is generated by forming the clearance Δc at the joint portion between the intermediate plate 53 and the fixing ring 541 (power transmission member 54), the energy The shaft unit including the absorbing device 5 can be bent at the joint portion between the intermediate plate 53 and the fixing ring 541 (power transmission member 54), and bending at other portions can be suppressed. Although not shown, the inner teeth 523b of the guide ring 523 have the same shape and configuration as the inner teeth 53b of the intermediate plate 53.

  Here, FIG. 5 is a conceptual diagram showing the effect of the seat belt retractor shown in FIG. 1, wherein (A) is a normal state of the present embodiment, (B) is an overload state of the present embodiment, and (C). Indicates the normal state of the comparative example, and (D) indicates the overload state of the comparative example. In each figure, a cross section is shown for a part of the energy absorbing device 5 (casing, intermediate plate, mass body).

  As shown in FIG. 5 (A), since the outer peripheral surface 53c of the intermediate plate 53 is in contact with the inner peripheral surface 511b of the casing 51 (housing), as shown in FIG. Even when a large force F acts on the casing 51 side via 2, the inclination of the intermediate plate 53 with respect to the casing 51 can be suppressed. The load due to the force F is absorbed at the joint portion between the fixing ring 541 (power transmission member 54) and the intermediate plate 53 as described above. In other words, the fixing ring 541 (power transmission member 54) acts on the energy absorbing device 5 like a universal joint (universal joint).

  On the other hand, as shown in FIG. 5C, when the outer peripheral surface 53c ′ of the intermediate plate 53 ′ is separated from the inner peripheral surface 511b ′ of the casing 51 ′ (housing), the centering of the intermediate plate 53 ′ is performed. Is performed at a joint portion between the fixing ring 541 '(power transmission member) and the intermediate plate 53'. As shown in FIG. 5D, when a large force F ′ acts on the casing 51 ′ side via the spool 2 ′, the intermediate plate 53 ′ also moves together with the locking base 4 ′ and the fixing ring 541 ′. It will be inclined. Therefore, a large load is applied to the mass body 522 ′ sandwiched between the intermediate plates 53 ′, which affects the energy absorption characteristics of the energy absorbing device 5 ′.

  As described above, according to the seat belt retractor 1 according to the above-described embodiment, the center plate 53 is arranged in the casing 51 by the outer peripheral surface 53c of the intermediate plate 53. Even when the (shaft 3) is about to bend, it can be actively bent at the joint with the power transmission member 54 in the energy absorbing device 5, and the main components (casing 51) constituting the energy absorbing device 5 The parallelism of the resistor 52 and the intermediate plate 53) can be maintained, and the performance of the energy absorption characteristics of the energy absorbing device 5 can be improved.

  Incidentally, in order to further improve the performance of the energy absorption characteristics of the energy absorbing device 5, as shown in FIG. 3, the casing 51 has a pair of radial bearing portions (first radial bearing portions) on both sides of the resistor 52. 55 and a second radial bearing portion 56). 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.

  As shown in FIG. 3, the inner edge of the housing 511 is formed with a recess that is slidably inserted into the tip of the shaft portion 541a of the fixing ring 541. The recess is an outer peripheral surface of the shaft portion 541a. And an opposing wall 511d disposed to face the tip of the shaft portion 541a. The first radial bearing portion 55 is configured by the annular wall 511c. Further, the thrust bearing portion 57 may be configured by the facing wall 511d.

  Further, a convex portion that is slidably inserted into the outer peripheral portion of the flange portion 541b of the fixing ring 541 is formed on the inner edge portion of the cover plate 512, and an annular shape that receives the convex portion is disposed on the outer peripheral portion of the flange portion 541b. The concave portion 541d is formed. The convex part formed in the inner edge part of the cover plate 512 has the annular wall 512c arrange | positioned along the outer peripheral surface of the recessed part 541d. The second radial bearing portion 56 is configured by the annular wall 512c. As shown in the figure, dust and the like can be prevented from being mixed by covering the opening of the cover plate 512 with the flange portion 541b.

  The 1st radial bearing part 55 and the 2nd radial bearing part 56 are comprised so that the radial load produced in the radial direction of the shaft 3 can be received, and it was especially close to the axial direction both ends of the energy absorption apparatus 5. Formed in position. Therefore, even when the shaft 3 is about to bend when the energy absorbing device 5 is operated, the radial load can be received by the first radial bearing portion 55 and the second radial bearing portion 56. Therefore, the energy absorbing device 5 can be supported at a position close to the casing 51 of the energy absorbing device 5, and axial displacement of the energy absorbing device 5 can be suppressed.

  In the present embodiment, the annular wall 511 c constituting the first radial bearing portion 55 is formed in a concave shape, but may be formed in a convex shape like the second radial bearing portion 56. Further, although the annular wall 512 c constituting the second radial bearing portion 56 is formed in a convex shape, it may be formed in a concave shape like the first radial bearing portion 55.

  In the above-described embodiment, the first radial bearing portion 55 and the second radial bearing portion 56 are configured by the contact surface with the fixing ring 541. For example, the fixing ring 541 is formed integrally with the locking base 4. In such a case, the first radial bearing portion 55 and the second radial bearing portion 56 may be configured by contact surfaces with the locking base 4.

  Next, the seatbelt apparatus 101 provided with the seatbelt retractor 1 mentioned above is demonstrated, referring FIG. Here, FIG. 6 is an overall configuration diagram showing the seat belt device according to the present embodiment.

  The seat belt device 101 shown in FIG. 6 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 absorption device 11 Base frame 12 Spring unit 12a Spring core 12b Spring cover 13 Lock mechanism 13a Paul 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 Casing 52 Resistor 53 Intermediate plate 53a Long hole 53b Inner teeth 53c Outer peripheral surface 54 Power transmission member 55 First radial bearing portion 56 Second Radial bearing portion 57 Thrust bearing portion 101 Seat belt device 102 Guide anchor 103 Belt anchor 104 Back Kul 105 Tongue 511 Housing 511a Corrugated groove 511b Inner peripheral surface 511c Annular wall 511d Opposing wall 512 Cover plate 512a Corrugated groove 512b Opening 512c Annular wall 521 Drive pin 522 Mass body 522a Protrusion part 523 Guide ring 523a Groove part 523b Inner tooth 541 Fixed ring 541a Shaft 541b Flange 541c Concave 541d Concave 541e Engaging tooth 541f Contact part 542 Connection ring 542a Convex part 542b Concave part

Claims (5)

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 absorbing device is connected to a housing having a bottom surface integrally formed on the concentric shaft at the end portion of the spool and having a corrugated groove formed in an annular shape so as to face the housing. A cover plate having a corrugated groove synchronized with the corrugated groove of the housing; a plurality of drive pins having one end inserted into the corrugated groove of the housing and the other end inserted into the corrugated groove of the cover plate; A plurality of mass bodies arranged in a section, a pair of intermediate plates that are inserted on both sides of the mass body through which the drive pin is inserted and connected to the locking base, and the intermediate plate and the locking base A fixing ring disposed between,
The intermediate plate has an outer peripheral surface that comes into contact with the inner peripheral surface of the casing so as to be centered.
A seat belt retractor characterized by that. The intermediate plate has an opening with internal teeth in the center, the fixing ring has a shaft portion having the internal teeth engageable with teeth, and wherein the The seat belt retractor according to claim 1. The seat belt retractor according to claim 2 , wherein the inner teeth and the engaging teeth have a contact portion that has a clearance in a radial direction and contacts in a circumferential direction.   The seat belt retractor according to claim 1, wherein the casing includes a pair of radial bearing portions on both sides of the resistor. 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 the 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 4 , wherein the seat belt retractor is the seat belt retractor.