JP2011020488A - Seat belt retractor and seat belt device with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress a decrease in a seat belt winding amount of a spool by actuation of a pretensioner even with the use of a low load EA mechanism. <P>SOLUTION: This seat belt retractor includes the spool 9 winding a seat belt, a locking base 12, the rotation of which in a seat belt pull-out direction is locked in an emergency, a torsion bar 14 limiting loads applied on the seat belt by its torsional deformation when the seat belt is pulled out in the emergency, and the pretensioner 13 actuating in the early stage of the emergency and rotating the spool 9 in the seat belt winding direction. Moreover, a torsion bar torsional deformation suppressing member 15 is arranged between the spool 9 and the locking base 12. This torsion bar torsional deformation suppressing member 15 suppresses the torsional deformation of the torsion bar 14 when the seat belt is wound by the pretensioner 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention belongs to the technical field of a seat belt retractor that winds up a seat belt so that the seat belt can be pulled out, and a seat belt device including the seat belt retractor.

  Conventionally, a seat belt device installed in a vehicle such as an automobile restrains an occupant with a seat belt in an emergency such as when a large vehicle deceleration is applied to a vehicle at the time of a collision or the like during normal driving. is there. Generally, this type of seat belt apparatus includes a seat belt retractor that winds up the seat belt when the seat belt is not worn.

  As a conventional seat belt retractor, in the early stage of the above-mentioned emergency, a pretensioner that rotates the spool in the seat belt retracting direction and retracts the seat belt, and restricts the withdrawal of the seat belt after the seat belt is retracted A seat belt retractor having an energy absorbing mechanism (hereinafter also referred to as an EA mechanism) that absorbs the occupant's energy by limiting the load applied to the seat belt by the action of the energy absorbing member is known (for example, a patent Reference 1).

  The seat belt retractor described in Patent Document 1 is a tread head (hereinafter, for convenience of description) that rotates together with a spindle (hereinafter referred to as a spool for convenience of description) during normal operation and is locked in the direction of withdrawal of the seat belt in the above-described emergency. A torsion bar as a first EA mechanism and a bending element as a second EA mechanism are provided between the locking base and the spool.

  Then, at the initial stage of the above-mentioned emergency, the pretensioner operates to rotate the locking base in the seat belt winding direction. The rotation of the locking base is transmitted to the spool via the torsion bar, and the spool rotates in the seat belt winding direction. As a result, the spool winds up the seat belt and removes the slack of the seat belt.

  Following the winding of the seat belt by the operation of the pretensioner, the seat belt tends to be pulled out due to the inertia of the occupant forward of the vehicle. As a result, the spool tends to rotate in the direction in which the seat belt is pulled out. At this time, since the rotation of the locking base in the seat belt withdrawing direction is locked, the spool rotates in the seat belt withdrawing direction while twisting the torsion bar and plastically deforming the bending element. The torsional deformation of the torsion bar and the plastic deformation of the bending element absorb kinetic energy based on the inertia of the occupant when the seat belt is pulled out. In this way, the two first and second EA mechanisms allow the occupant's kinetic energy absorption characteristics when the seatbelt is pulled out in an emergency, that is, the load applied to the occupant from the seatbelt, the size of the vehicle, the emergency situation, etc. Various settings can be made according to.

  Conventionally, as another second EA mechanism that operates when the seat belt is pulled out due to the inertia of the occupant in the above-described emergency, a seat belt provided with an energy absorption pin disposed between a locking base and a spool. A retractor is also known (see, for example, Patent Document 2). In the seat belt retractor described in Patent Document 2, when the seat belt is withdrawn in an emergency, the energy absorbing pin is bent by the spool rotating relative to the locked locking base in the seat belt withdrawing direction. It is pulled out from the spool while being plastically deformed. The torsional deformation of these torsion bars and the bending plastic deformation of the energy absorption pins absorb the occupant's kinetic energy when the seat belt is pulled out.

Japanese Patent Application Laid-Open No. 2008-174049. Japanese Patent Application Laid-Open No. 2008-114659.

  By the way, there is a case where a seat belt retractor that needs to reduce the load applied from the seat belt to the occupant as much as possible when the seat belt is pulled out in an emergency is required. In such a case, the second EA mechanism described in Patent Documents 1 and 2 is omitted, and the torsion bar of the first EA mechanism is twisted even when the aforementioned load applied from the seat belt to the occupant is low. It is required to make a low-load torsion bar that is easy to do.

However, in the seat belt retractor described in Patent Document 1, when the torsion bar is thus a low load torsion bar, the torsion bar is easily twisted and deformed when the seat belt is wound by the operation of the pretensioner, and is operated by the pretensioner. The locking base rotates relative to the spool in the seat belt winding direction. In the case of the low-load torsion bar indicated by the solid line in FIG. 6, the relative rotation amount θ ₁ between the locking base and the spool at the end of the seat belt winding in an emergency is difficult to torsional deformation indicated by the one-dot chain line in FIG. It becomes larger than the same relative rotation amount θ _{2 in} the case of a high-load torsion bar. That is, the twist amount α of the low load torsion bar when the seat belt is wound by the operation of the pretensioner becomes larger than the twist amount β of the high load torsion bar. For this reason, using a low-load torsion bar can reduce the load applied to the occupant from the seat belt compared to the conventional seat belt retractor, but reduces the amount of seat belt retracted by the spool due to the same pretensioner operation. There is a problem of doing.

Therefore, even if a low-load torsion bar is used, it is conceivable to increase the operation amount of the pretensioner in order to secure a desired amount of the seat belt retracted by the operation of the pretensioner. However, simply increasing the operating amount of the pretensioner causes a problem that the pretensioner becomes large and, as a result, the seat belt retractor also becomes large.
The seat belt retractor described in Patent Document 2 also has the same problem when a low load torsion bar is used.

  The present invention has been made in view of such circumstances, and the object thereof is to effectively reduce the amount of the seat belt wound on the spool by the operation of the pretensioner even when the low load EA mechanism is used. It is an object of the present invention to provide a seat belt retractor and a seat belt device including the same.

In order to solve the above-described problems, a seat belt retractor according to the present invention includes a spool that winds up a seat belt, and rotates with the spool in a normal state and is locked in rotation in the seat belt withdrawing direction in an emergency. A locking mechanism having a locking member that causes rotation; and an energy absorbing member that is disposed between the spool and the locking member and that deforms when the seat belt is pulled out in an emergency to limit a load applied to the seat belt. A seat belt retractor including at least a pretensioner that operates at an initial stage in an emergency to rotate the spool in a seat belt winding direction, and is disposed between the spool and the locking member. When the seat belt is wound by the operation of the It is characterized by having an energy absorbing member deformation suppressing member for suppressing the deformation of formic absorbing member.

  The seat belt retractor according to the present invention is characterized in that the spool is rotated via the energy absorbing member when the pretensioner rotates the locking member.

  In the seat belt retractor according to the present invention, the energy absorbing member deformation suppressing member is provided continuously with the engaging portion engaging with the locking member and the engaging portion, and fitted into the fitting hole of the spool. It is characterized in that it is formed in a pin shape from the mating shaft portion.

  Further, in the seat belt retractor according to the present invention, the locking portion of the energy absorbing member deformation suppressing member is a columnar head, and the shaft portion of the energy absorbing member deformation suppressing member is smaller than the diameter of the head. It is characterized by a small diameter.

  On the other hand, the seat belt device according to the present invention includes a seat belt retractor that winds up the seat belt, a tongue that is slidably supported by the seat belt pulled out from the seat belt retractor, and the tongue is detachable. A seat belt retractor that restrains the occupant by restraining the withdrawal of the seat belt by the seat belt retractor in an emergency, wherein the seat belt retractor is one of the seat belt retractors of the present invention described above. It is characterized by being one.

  According to the seat belt retractor of the present invention, the energy absorbing member deformation suppressing member that operates when the seat belt is wound by the pretensioner in an emergency is provided. Thereby, even if it uses the low load energy absorption member which is easy to deform | transform even if it is a low load for an energy absorption member, the deformation amount of the energy absorption member at the time of seat belt winding by a pretensioner can be suppressed. Therefore, it is possible to effectively suppress a reduction in the amount of the seat belt wound around the spool due to the operation of the pretensioner. In this way, it is possible to reduce the load on the occupant applied from the seat belt when the seat belt is subsequently pulled out while suppressing the decrease in the seat belt winding amount of the spool due to the operation of the pretensioner at the initial stage in an emergency.

  In addition, since it is not necessary to increase the operation amount of the pretensioner, it is possible to suppress an increase in the size of the pretensioner, and as a result, the seat belt retractor can be formed in a compact and compact manner even if a low load energy absorbing member is used.

  Further, the energy absorbing member deformation suppressing member is formed in a pin shape from a locking portion that engages with the locking member and a shaft portion that is provided continuously to the engaging portion and that fits into the fitting hole of the spool. Yes. Thereby, the structure of an energy absorption member deformation | transformation suppression member can be simplified. Therefore, the conventional seat belt retractor can be dispensed with without a major design change. In particular, by using a conventionally well-known and conventional torsion bar for the energy absorbing member, it is possible to reduce the cost of the seat belt retractor even if an energy absorbing member deformation suppressing member is provided without further design change of the conventional seat belt retractor. .

  On the other hand, according to the seat belt device of the present invention, since the seat belt retractor of the present invention that can be formed in a compact and compact manner is used, the interior of the passenger compartment can be widened accordingly. Therefore, it is sufficiently and flexibly compatible with the demand for increasing the cabin space as much as possible without increasing the overall size of the vehicle and the demand for reducing the load applied to the passengers in an emergency in recent years. It becomes possible to cope with.

It is a figure showing typically an example of a seat belt device provided with an example of an embodiment of a seat belt retractor of the present invention. It is a side view which shows an example of embodiment of the seatbelt retractor of this invention. It is sectional drawing which follows the III-III line in FIG. The operation of the torsion bar torsional deformation suppressing member is described, (a) is a diagram showing a non-operating state in a normal state, (b) is a diagram showing an intermediate state of an operation process at the time of winding a seat belt by a pretensioner, ( (c) is a figure which shows the seat belt winding completion state by a pretensioner, (d) is sectional drawing which follows the IVD-IVD line | wire in (c). It is a figure which shows the operating characteristic of the torsion bar of the seatbelt retractor of this invention. It is a figure which shows the operating characteristic of the torsion bar of the conventional seatbelt retractor.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically illustrating an example of a seat belt apparatus including an example of an embodiment of a seat belt retractor according to the present invention.
As shown in FIG. 1, a seat belt apparatus 1 of this example is a three-point seat belt apparatus similar to a conventional general three-point seat belt apparatus. In FIG. 1, 1 is a seat belt device, 2 is a vehicle seat, 3 is a seat belt retractor disposed in the vicinity of the vehicle seat 2, and 4 is retractable by the seat belt retractor 3 so as to be retractable and a belt anchor 4a at the front end. The seat belt 5 fixed to the floor of the vehicle body or the vehicle seat 2 is guided by the guide anchor 5 that guides the seat belt 4 pulled out from the seat belt retractor 3 toward the shoulder of the occupant. A tongue 6 slidably supported by the seat belt 4 and a buckle 7 fixed to the floor of the vehicle body or the vehicle seat and detachably inserted into the tongue 6.

FIG. 2 is a side view showing an example of an embodiment of the seat belt retractor of the present invention, and FIG. 3 is a sectional view taken along line III-III in FIG.
As shown in FIGS. 2 and 3, the seat belt retractor 3 of this example includes a U-shaped frame 8 having a pair of side walls 8a and 8b. A bottomed cylindrical spool 9 that winds up the seat belt 4 is disposed through the side wall 8a on one side (left side in FIG. 3) of the frame 8. Also, on the outside of the side wall 8a (on the left side of the side wall 8a in FIG. 3), a conventionally known lock mechanism 10 that operates when the seat belt 4 is pulled out more rapidly than in the case of emergency and when the seat belt 4 is pulled out for normal wearing. A conventionally known spring mechanism 11 having a spring that constantly biases the spool 9 in the seat belt winding direction is provided. In that case, a part 10b of the lock mechanism 10 is housed in a lock mechanism case 10a attached to the side wall 8a, and the spring mechanism 11 is housed in a spring mechanism case 11a attached to the side wall 8a. Since both the lock mechanism 10 and the spring mechanism 11 are conventionally known, a detailed description thereof will be omitted. The rotation shaft 9a of the spool 9 is rotatably supported by the spool urging mechanism case 11a.

  In this example, the lock mechanism 10 has a part 10b disposed on the left side in FIG. 3 of the spool 9 and the other part 10c disposed on the right side in FIG. The other part 10c of the locking mechanism 10 has a locking base 12 that is a locking member. The locking base 12 is disposed through the side wall 8b on the other side of the frame 8 (right side in FIG. 3). Although not shown, a part 10b of the lock mechanism 10 operates in the above-described emergency or the like to lock the rotation of the locking base 12 in the seat belt withdrawing direction.

Further, on the outside of the side wall 8b (on the right side of the side wall 8b in FIG. 3), there is a conventionally known pretensioner 13 that operates in the aforementioned emergency and rotates the locking base 12 (that is, the spool 9) in the seat belt winding direction. It is arranged. In that case, the pretensioner body 13a is attached to the side wall 8b. Since this pretensioner 13 is conventionally known, its detailed description is omitted. The rotating base 12 of the locking base 12 is rotatably supported by the pretensioner body 13a. At this time, the locking base 12 is fitted coaxially to the spool 9 and is rotatable relative to the spool 9.

  Further, a torsion bar 14 that is an energy absorbing member is disposed between the spool 9 and the locking base 12. The torsion bar 14 is torsionally deformed when the seat belt is withdrawn in an emergency and absorbs the kinetic energy of the occupant due to inertia in the same manner as a conventionally known torsion bar. It is configured as a low-load torsion bar that is easily deformed. One end portion 14a of the torsion bar 14 is fitted and supported on the spool 9 so as to be integrally rotatable, and the other end portion 14b of the torsion bar 14 is fitted and supported on the locking base 12 so as to be integrally rotatable.

  Further, a torsion bar torsional deformation suppressing member 15 which is an energy absorbing member deformation suppressing member is disposed between the spool 9 and the locking base 12. The torsion bar torsional deformation suppressing member 15 is formed in a pin shape having a columnar head portion 15a and a columnar shaft portion 15b that is provided continuously with the head portion 15a and has a smaller diameter than the head portion 15a. . Further, as shown in FIGS. 4A to 4D, the locking base 12 is formed with a columnar head fitting hole 12b into which the head 15a is fitted, and the shaft portion 15b is fitted therein. A shaft fitting groove 12c is formed. In that case, the shaft portion fitting groove 12c has an annular shape concentric with the locking base 12, and the center of the width of the shaft portion fitting groove 12c in the radial direction of the locking base 12 coincides with the center of the head fitting hole 12b. They are almost identical. Furthermore, the head fitting hole 12b and the shaft fitting groove 12c are communicated with each other.

  In normal times, the shaft portion 15b of the torsion bar torsional deformation suppressing member 15 is fitted into the fitting hole 9b having a circular cross section of the spool 9 through the shaft portion fitting groove 12c with almost no gap. At the same time, the head 15a of the torsion bar torsion deformation suppressing member 15 is fitted in the head fitting hole 12b with almost no gap. In this state, the head portion 15a (corresponding to the engaging portion of the present invention) of the torsion bar torsion deformation suppressing member 15 is engaged with the bottom portion of the head fitting hole 12b of the locking base 12 in the spool 9 direction. Yes. Therefore, the torsion bar torsional deformation suppressing member 15 cannot pass the locking base 12 from the side opposite to the spool 9 to the spool 9 side.

  Further, the shaft length of the portion of the shaft portion 15b of the torsion bar torsion deformation suppressing member 15 that is normally fitted in the fitting hole 9b of the spool 9 is at least the seat belt retracted by the pretensioner 13 in an emergency. Is set to a length that allows the shaft portion 15b to escape from the fitting hole 9b.

The operation of the seat belt retractor 3 in this example will be described.
In the normal state with the seat belt 4 mounted, the spool 9 and the locking base 12 are not rotated relative to each other by the torsion bar torsional deformation suppressing member 15 as shown in FIG. Rotate integrally in any direction.

  In this state, when the above-described emergency occurs, the locking mechanism 10 is activated and the locking base 12 is locked against rotation in the seat belt pull-out direction, as in the conventional seat belt retractor. Therefore, only the spool 9 can rotate in the seat belt withdrawing direction.

  Further, the pretensioner 13 is activated at the same time or almost simultaneously with the occurrence of an emergency, and the pretensioner 13 generates torque. Due to the torque of the pretensioner 13, the locking base 12 rotates in the seat belt winding direction, and the spool 9 also rotates in the same direction via the torsion bar 14. Thereby, the seat belt 4 is wound around the spool 9, and the slack of the seat belt 4 is removed. At this time, since the torsion bar 14 is a low load torsion bar, the torsion bar 14 is torsionally deformed and the locking base 12 is retracted with respect to the spool 9 in the seat belt winding direction (counterclockwise indicated by an arrow in FIG. 4B). Around).

  As described above, the locking base 12 rotates relative to the spool 9 in the seat belt winding direction, so that the shaft portion 15 b of the torsion bar torsional deformation suppressing member 15 is bent and deformed between the spool 9 and the locking base 12. However, the spool 9 is pulled out from the fitting hole 9b. At this time, the shaft portion 15 b pulled out from the fitting hole 9 b is positioned in the shaft portion fitting groove 12 c of the locking base 12. The torsion bar 14 is difficult to twist due to the bending deformation of the shaft portion 15b of the torsion bar torsion deformation suppressing member 15, and the torsion deformation of the torsion bar 14 is suppressed when the seat belt is wound by the pretensioner 13 in an emergency. Therefore, the relative rotation amount of the locking base 12 with respect to the spool 9 is suppressed.

After the locking base 12 is further rotated relative to the spool 9 in the seat belt winding direction, when the seat belt winding by the pretensioner 13 is finished, the torsion bar torsional deformation suppressing member as shown in FIG. Fifteen shaft portions 15b escape from the fitting holes 9b. At this time, the relative rotation amount of the locking base 12 and the spool 9 is θ ₃ °, and the twist amount of the torsion bar 14 is γ °. In the seat belt retractor 3 of this example, for the convenience of comparison with the conventional seat belt retractor, the twist amount γ ° is the twist of the torsion bar in the seat belt retractor using the conventional high load torsion bar shown in FIG. It is set to be equal to or approximately equal to the amount β °. Therefore, as shown in FIG. 5, the twist amount γ ° of the seat belt retractor 3 of this example is smaller by δ ° than the twist amount α ° of the torsion bar in the seat belt retractor using the conventional low load torsion bar (δ = Α-γ). Of course, it is not limited to this.

  Following the end of winding of the seat belt 4 by the pretensioner 13, the seat belt 4 tends to be pulled out of the seat belt retractor 3 due to the inertia of the occupant. For this reason, the spool 9 rotates in the seat belt withdrawing direction, and the seat belt 4 is withdrawn. At this time, since the locking base 12 is locked against rotation in the seat belt withdrawing direction, the torsion bar 14 continues to twist and deform in the same direction. As described above, when the seat belt is retracted by the pretensioner 13, the locking base 12 rotates relative to the spool 9 in the seat belt retracting direction. This means that the spool 9 pulls out the seat belt from the locking base 12. It is nothing but a relative rotation in the direction. That is, the torsion bar 14 is torsionally deformed in the same direction as when the seat belt is wound by the pretensioner 13 when the seat belt 4 is pulled out due to the inertia of the passenger.

Therefore, as shown in FIG. 5, the torque applied to the torsion bar 14 becomes the same constant torque as the torque at the end of the seat belt winding θ ₃ , and the torsion bar 14 is torsionally deformed by this constant torque. Due to the torsional deformation of the torsion bar 14, the pull-out of the seat belt 4 is suppressed, the load applied to the occupant from the seat belt 4 is limited, and the kinetic energy of the occupant is absorbed. That is, the EA operation by the torsion bar 14 is performed when the seat belt is pulled out due to the inertia of the occupant. At this time, since the shaft portion 15b of the torsion bar torsional deformation suppressing member 15 has escaped from the fitting hole 9b of the spool 9, the shaft portion 15b is not bent and deformed. Therefore, only the torsion bar 14 which is a low load torsion bar is torsionally deformed with a low load, and the load applied to the occupant is reduced. Thus, even when a low-load torsion bar is used for the torsion bar 14, the EA operation by the low load of the torsion bar 14 can be performed while the torsion amount of the torsion bar 14 when the seat belt is wound by the pretensioner 13 is suppressed. It becomes possible.

  According to the seat belt retractor 3 of this example, the torsion bar torsional deformation suppressing member 15 that is operated when the seat belt is retracted by the pretensioner 13 and is not operated when the seat belt is withdrawn is provided. Even if a low-load torsion bar is used for 14, the torsion amount of the torsion bar 14 when the seat belt is wound by the pretensioner 13 can be suppressed. Therefore, it is possible to effectively suppress a reduction in the amount of the seat belt wound around the spool due to the operation of the pretensioner. In this way, it is possible to reduce the occupant's load applied from the seat belt 4 when the seat belt is subsequently pulled out while suppressing a decrease in the amount of the seat belt retracted by the spool due to the operation of the pretensioner in the initial stage of an emergency.

  In addition, since it is not necessary to increase the operation amount of the pretensioner 13, it is possible to suppress an increase in the size of the pretensioner 13, and as a result, the seat belt retractor can be formed in a compact and compact manner even if a low load torsion bar is used.

  Further, since the torsion bar torsional deformation suppressing member 15 is formed in a pin shape including the head portion 15a and the shaft portion 15b, the configuration of the torsion bar torsional deformation suppressing member 15 can be simplified. Therefore, the conventional seat belt retractor can be dispensed with without a major design change. In particular, by using the torsion bar 14, it is possible to reduce the cost of the seat belt retractor 3 even if the torsion bar torsional deformation suppressing member 15 is provided without further changing the design of the conventional seat belt retractor.

On the other hand, according to the seat belt device 1 of this example, since the above-described seat belt retractor 3 that can be formed in a compact and compact manner is used, the interior of the passenger compartment can be widened accordingly. Therefore, it is sufficiently and flexibly compatible with the demand for increasing the cabin space as much as possible without increasing the overall size of the vehicle and the demand for reducing the load applied to the passengers in an emergency in recent years. It becomes possible to cope with.
Other configurations and other functions and effects of the seat belt retractor 3 and the seat belt apparatus 1 of this example are the same as those of the conventionally known seat belt retractor and seat belt apparatus.

  The seat belt retractor according to the present invention has an EA mechanism such as a torsion bar between the spool 9 and the locking base 12, and the seat belt retractor absorbs the kinetic energy of the occupant in an emergency by the EA mechanism. The present invention is applicable to various seat belt retractors within the scope of the matters described in the claims.

  The seat belt retractor according to the present invention is used in a seat belt device attached to a vehicle such as an automobile, and absorbs occupant's kinetic energy by limiting a load applied to the seat belt by an energy absorbing member in an emergency such as a collision. It can be suitably used for a seat belt retractor that restricts the withdrawal of the seat belt.

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 2 ... Vehicle seat, 3 ... Seat belt retractor, 4 ... Seat belt, 6 ... Tongue, 7 ... Buckle, 8 ... Frame, 9 ... Spool, 9b ... Fitting hole, 10 ... Lock mechanism, 11 ... Spring mechanism, 12 ... Locking base, 12b ... Head fitting hole, 12
c: Shaft fitting groove, 13 ... Pretensioner, 14 ... Torsion bar, 15 ... Torsion bar torsion deformation suppressing member, 15a ... Head, 15b ... Shaft

Claims (5)

A spool that winds up a seat belt; a locking mechanism that rotates together with the spool in a normal state and has a locking member that is locked in rotation in a seat belt pull-out direction in an emergency to cause relative rotation with the spool; and the spool and the locking member; And an energy absorbing member that is deformed when the seat belt is pulled out in an emergency and restricts a load applied to the seat belt, and operates in the initial stage of an emergency to move the spool in the seat belt winding direction. In a seat belt retractor comprising at least a pretensioner that rotates,
An energy absorbing member deformation suppressing member is provided between the spool and the locking member and suppresses deformation of the energy absorbing member when the seat belt is wound by the operation of the pretensioner. Seat belt retractor.   The seat belt retractor according to claim 1, wherein the pretensioner rotates the spool through the energy absorbing member by rotating the locking member.   The energy absorbing member deformation suppressing member is formed in a pin shape from a locking portion that engages with the locking member and a shaft portion that is provided continuously with the engaging portion and that fits into the fitting hole of the spool. The seat belt retractor according to claim 1, wherein the seat belt retractor is provided.   4. The locking portion of the energy absorbing member deformation suppressing member is a columnar head, and the shaft portion of the energy absorbing member deformation suppressing member is smaller in diameter than the head. The seat belt retractor described in 1. A seat belt retractor that winds up the seat belt, a tongue that is slidably supported by the seat belt pulled out from the seat belt retractor, and a buckle that is detachably engaged with the tongue, and is provided in an emergency. In a seat belt device that restrains an occupant by suppressing the withdrawal of the seat belt by a seat belt retractor,
The seat belt apparatus according to any one of claims 1 to 4, wherein the seat belt retractor is the seat belt retractor.

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