JP3214178B2 - Seat belt retractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt retractor mounted on a vehicle such as an automobile. More specifically, the present invention relates to an improvement in a seat belt retractor having a structure in which a seat belt does not excessively press an occupant.

[0002]

2. Description of the Related Art In a seat belt retractor mounted on an automobile or the like, when an occupant sits down, wears a belt, and absorbs excess slack (when normally worn), the occupant does not need to use it. It is desired that the configuration is such that a feeling of oppression is not given.

[0003] As a seat belt winding device that meets such expectations, the present applicant has proposed Japanese Utility Model Application Laid-Open No. 63-52656.

In this method, a spring means for urging the belt in the winding direction is divided into a main spring and an additional spring in advance, and at the time of normal belt winding, a sufficient belt winding force is obtained by a combined pressure of both springs. And a seat belt retractor having a structure such that the belt can be softly fitted to the occupant only by the urging force of the main spring when the seat belt is normally worn.

FIG. 7 is a schematic view showing the relationship between a spring and a belt in Japanese Utility Model Laid-Open No. 63-52665.
The main spring 121 and the additional spring 117 are installed in parallel. The main spring 121 is always connected to the belt B. A clutch gear 111a is connected to the additional spring 117.
A is provided with a claw 111b. This nail 111b
Can be engaged with the stopper 111c on the belt B side.
A swinging claw 128 at the tip of a pivot lever 126 can be engaged with the teeth of the clutch gear 111a, and the pivot lever 126 is swung by an electromagnetic solenoid 123.

[0006] When the winding is completed as shown in Fig. 7A, the urging force of both the main spring 121 and the additional spring 117 is applied to the belt B.

When the belt is pulled out as shown in FIG. 7 (b), the clutch gear 111a eventually engages with the swinging pawl 128. In FIG. 7 (b), the solenoid 123
Is demagnetized.

Assume that the occupant pulls out the belt B sufficiently long as shown in FIG. 7 (b) to attach the tongue to the buckle, attaches the tongue to the buckle, and turns to the front. Then, the belt B is slightly wound up. FIG. 7 (c) shows a state where the occupant is facing the front in this way.

In FIG. 7C, the main spring 12
Only one is pulling the belt B, which fits softly on the occupant.

That is, in FIG. 7 (c), the clutch gear 1
11a is engaged with the swinging pawl 128 and cannot be retracted. Therefore, the engaging portion 111c is separated from the claw 111b.

When the solenoid 123 is excited in the state shown in FIG. 7 (c), the swing pawl 128
Depart from 1a. Then, the clutch gear 111a is pulled back by the additional spring 117, and the pawl 111b is engaged with the engaging portion 111c as shown in FIG. 7A, so that the winding force of the additional spring 117 is also applied to the belt B. Accordingly, the belt B is strongly wound into the winding device.

Japanese Utility Model Application Laid-Open No. 63-52656 has the following problems. That is, when the solenoid 123 is excited in the state shown in FIG. 7 (c), the instant the clutch 128 is disengaged from the clutch gear 111a,
1a is pulled by the additional spring 117 and rapidly moves to the left in the figure. Then, the pawl 111b is engaged with the engaging portion 111c.
Mechanical sound (shock sound) is generated by violently colliding with.

The present applicant has proposed a seat belt retractor improved to prevent such an impact noise from Japanese Patent Application No. 62-1987.
297467 (JP-A-01-141147).

The operation of the seat belt retractor disclosed in Japanese Patent Application No. 62-297467 will be described with reference to FIG.

In Japanese Patent Application No. 62-297467,
The main spring 236 and the additional spring 234 are installed in parallel, and the main spring 236 is always connected to the belt B. The tip of the additional spring 234 is tape 2
It is connected to the belt B via 51.

A clutch gear 241 is provided at the tip of the additional spring 234. This clutch gear 241
A clutch claw 245 is provided to prevent the retraction of the clutch. The clutch claw 245 is unlocked by the pivot lever 244 and the solenoid 246.

In Japanese Patent Application No. 62-297467,
When the seat belt B is unwound, it operates in the order of FIGS. 6 (a) and 6 (b), the clutch gear 241 is locked by the clutch claws 245, and retreat is prevented.

When the occupant with the tongue engaged with the buckle turns to the front and the seat belt B is slightly rewound, the seat belt B is attached only by the main spring 236 as shown in FIG. It is in a state of being energized.
That is, the clutch pawl 245 is engaged with the clutch gear 241, and the clutch gear 241 is
You cannot retreat even if you are energized at 4.

In the state shown in FIG. 6C (occupant restrained state by the seat belt), the seat belt B is lightly pulled only by the main spring 236, and the seat belt B is lightly applied to the occupant. Fit.

In the state shown in FIG. 6 (c), when the solenoid 246 is operated to release the engagement of the clutch gear 241 by the clutch pawl 245, the clutch gear 241 is rapidly moved by the urging force of the additional spring 234, and finally. As a result, the tape 251 is in a tension state, and the seat belt B is urged by both the main spring 236 and the additional spring 234 to be strongly wound (the state of FIG. 6A).

By the way, in the state of FIG. 6B in which the clutch gear 241 is locked by the clutch pawl 245,
When the engagement of the clutch pawl 245 is released, the clutch gear 241 is urged by the additional spring 234 and moves at a considerably high speed. Finally, the tape 251 is in a tension state. In Japanese Patent Application No. 62-297467, even at the moment when the tape 251 is tensioned, there is no collision between the members, so that almost no collision sound is generated.

[0022]

SUMMARY OF THE INVENTION As described above, Japanese Patent Application No.
According to 2-297467, a loud impact sound caused by the collision of the clutch gear 241 after the clutch pawl is released is prevented. There was something.

[0023]

According to a first aspect of the present invention, there is provided a seat belt retractor in which the urging force of an additional spring is transmitted to a reel via a tape. An elastic member for reducing impact is provided on the outer peripheral surface of the tape winding member.

According to a second aspect of the present invention, in the seat belt retractor according to the first aspect, the elastic member has one end attached to the tape winding member and extends along an outer peripheral surface of the tape winding member. The other end is a leaf spring separated from the outer peripheral surface of the tape winding member.

According to a third aspect of the present invention, in the seat belt retractor, a cushioning member is provided in a power transmission path for transmitting an urging force from the additional spring to the reel in order to reduce the tension applied to the tape. It is.

[0026]

According to the seat belt retractor of the present invention, even if a large tensile force is applied to the tape, the peak value of the stress (tension) generated in the tape is reduced. Thereby, the generation of the impact noise can be completely or almost eliminated.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings. FIG. 1 is a full exploded perspective view of a seat belt retractor according to the present invention, FIG. 2 is a front view of the present retractor in an assembled state, FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
FIG. 4 is an enlarged cross-sectional view of a main part of the tape memory unit as viewed from IV-IV in FIG.

In the drawing, a seat belt winding device according to the present invention includes a winding mechanism 10 for a seat belt B, a tongue (not shown) on the belt B side, and a buckle member (not shown) on a buckle-stoke side. ), A biasing mechanism 30 having two springs, the winding mechanism 10 and the biasing mechanism 3.
The clutch device unit 40 includes a clutch device unit 40 that removably couples the clutch unit 0 and a tape memory unit 50.

The winding mechanism 10 includes a pair of side walls 11.
a, a frame 11 having a U-shaped cross section having a and 11b, an opening 11c formed in a left side wall 11a of the frame 11,
A retainer 12 attached to the left side wall 11a, a bearing member 13 fitted in an opening formed in the right side wall 11b of the frame 11, and a bearing opening 12a formed in the bearing member 13 and the retainer 12 A main shaft 14, a ratchet wheel 14a formed at the right end of the shaft 14 for an emergency lock device (not shown), a square shaft 14b formed at the left end of the main shaft 14, and the square shaft 14b, a connecting shaft 15 which rotates integrally with the main shaft 14, and a belt reel 16 which is combined so as to rotate integrally with the main shaft 14.
And

The base end of the belt B is fixed to a belt holding portion 16a formed on the shaft of the reel 16.

The connecting shaft 15 has a small diameter clutch gear fitting portion 15A and a large diameter tape winding portion 15B provided coaxially. The clutch gear fitting portion 15A has an inner end locking groove 15 for locking an inner end of a main spring 36 described later.
a is provided in the diameter direction. Further, a tape 5 described later is also provided on the left end of the tape winding section 15B forming the step.
1 is provided with a tape holding portion 15b for locking the inner end.

[0032] As shown in FIG.
Is for detecting when the tongue (not shown) attached to the seat belt B side and the buckle 21 are in a normal coupling state. The detection unit 20 outputs a connection completion signal when the tongue inserted in the buckle 21 presses the switch 22 installed in the buckle 21.

The urging mechanism 30 includes a cover 31 attached to the side wall 11a of the frame 11 together with the retainer 12,
A first storage chamber 32 formed in the cover 31, an additional spring 34 whose outer end is locked by an outer end locking portion 33 provided in the first storage chamber 32, and the first storage chamber 32. A housing 35 provided to cover and having a second storage chamber 35a; a main spring 36 whose outer end is locked by an outer end locking portion 35b provided in the second storage chamber 35a; And a cap 37 fixed to the housing 35 so as to cover the two storage chambers 35a.

The inner end of the additional spring 34 is locked by a locking portion 41c of the clutch gear 41 described later. Thus, the clutch gear 41 can be urged by the additional spring 34 in the belt winding direction.
The inner end of the main spring 36 is the locking groove 1 of the connecting shaft 15.
5a. Thereby, the seat belt B
Is always urged by the main spring 36 in the winding direction.

The clutch device section 40 includes a clutch gear 41
And a clutch pawl mechanism 42. Clutch gear 4
The tooth portion 41a on the outer peripheral surface of the reference numeral 1 has a sawtooth shape. This claw part 4
When the tooth surface 1a rotates in the pull-out direction of the seat belt B, the gentle slope becomes the front surface in the rotation direction, and when it rotates in the belt winding direction, the steep surface becomes the front surface in the rotation direction.

As will be described later, when the clutch pawl 45 comes into contact with the teeth 41a, only rotation in the belt withdrawing direction can be permitted. That is, the clutch pawl 45 and the clutch gear 41 constitute a so-called one-way rotating clutch gear.

The inner end of the additional spring 34 is locked to the inner end locking portion 41c of the boss 41b of the clutch gear 41.

The center hole 41h of the clutch gear 41 is rotatably fitted to the clutch gear fitting portion 15A of the connecting shaft 15.

The clutch pawl mechanism 42 includes a pivot lever 4
4, a clutch claw 45, and a solenoid 46.

The pivot lever 44 is connected to the retainer 12
An intermediate portion thereof is rotatably supported by a support shaft 43 implanted in the base. A slit 44a is formed in one arm of the pivot lever 44 in the longitudinal direction.

The clutch pawl 45 is connected to the pivot lever 44
Is provided at the tip of the other arm so as to be rotatable only in a very small angle range.

A pin 46b protrudes from a side surface of the plunger 46a of the solenoid 46. The pin 46b is engaged in the slit 44a of the pivot lever 44. The solenoid 46 is actuated based on the detection signal from the detection unit 20, and the pivot lever 44 is swung by the plunger 46 projecting and retracting. 47 is an electromagnetic solenoid 46
Is a return spring for retracting the plunger 46a at the time of demagnetization. The clutch pawl mechanism 42 composed of these members 43 to 47 is housed in the space on the retainer 12 side of the cover 31 as shown in FIG.

The interlocking relationship between the clutch pawl 45, the solenoid 46, and the tooth portion 41a of the clutch gear 41 is as follows.

When the solenoid 46 is in the demagnetized state, the return spring causes the plunger 46 a to protrude, and lowers the distal end of the pivot lever 44 in FIG. As a result, the clutch pawl 45 is
Move away from the first tooth portion 41a.

When the solenoid 46 is in the excited state, the plunger 46 a is retracted, and the tip end of the pivot lever 44 is raised in FIG. Thereby, the clutch pawl 45 meshes with the tooth portion 41a.

As shown in FIG. 4, the tape memory unit 50
Is composed of a tape 51 and a connecting shaft 15 (particularly, a tape winding portion 15B). A loop 51a is provided at the inner end of the tape 51, and the loop 51a is hooked on the tape holding portion 15b of the connecting shaft 15.
This tape 51 is a tape winding portion 1 of the connecting shaft 15.
5B is wound.

A loop 51b provided at the outer end of the tape 51 is engaged with a tape outer end holding portion 53 formed on the end face of the clutch gear 41 on the retainer 12 side.

A leaf spring 54 is provided at the tape winding portion 15B of the connecting shaft 15. The leaf spring 54 has loops 54R at both ends. This leaf spring 54 is loosely curved so as to gradually move away from the outer peripheral surface of the tape winding section 15B.

As shown in FIG. 4, a columnar spring mounting projection 5 is formed on the left end face of the tape winding section 15B in FIG.
5 are provided. A leaf spring 5 is provided around the protrusion 55.
A groove 56 is formed at a depth equal to or greater than the width of the plate spring 5.
The loop 54R at the base end portion of No. 4 is locked.

An escape recess 57 is provided at a position separated from the projection 55 by the length of the leaf spring 54. The recess 57 has a depth approximately equal to that of the groove 56, and the loop 54R on the distal end side of the leaf spring 54 enters when bent in the direction of arrow M.

The tape 51 is made of a flexible synthetic resin having a high tensile strength and a small elongation. When the seat belt B is unwound from the belt reel 16, the connecting shaft 15 rotates clockwise in FIG. The operations of the main spring 36, the tape 51 and the clutch gear 41 at this time are as follows.

(A) Since the inner end of the main spring 36 is directly connected to the inner end holding portion 15a, the tape 51 is wound and tightened with the clockwise rotation of the connecting shaft 15 when the belt is pulled out. The slack is absorbed.

(B) The inner end of the tape 51 is directly connected to the tape inner end holding portion 52 of the connecting shaft 15, and the outer end is connected to the tape outer end holding portion 53 of the clutch gear 41. Therefore, when the winding of the tape 51 is completed, the clutch gear 41 starts rotating clockwise while the leaf spring 54 is bent toward the connection shaft 15. Since the inner end of the additional spring 34 is engaged with the spring inner end holding portion 41c of the clutch gear 41, the additional spring 34 is wound and tightened as the clutch gear 41 rotates clockwise.

(C) When the clutch pawl 45 is engaged with the teeth 41a of the clutch gear 41, the clutch gear 41 is only allowed to rotate clockwise, and is not allowed to rotate counterclockwise. It is blocked by the clutch pawl 45.

FIG. 5 shows these springs 34, 36,
Clutch gear 41, pivot lever 44, clutch pawl 4
5 schematically shows the relationship among the solenoid 46, the tape 51, the leaf spring 54, and the like.

Next, the operation of the embodiment configured as described above will be described.

I. The state in which the entire amount of the belt B has been wound around the reel 16 is stored in the belt. Since the urging force of the main spring 36 is constantly applied to the connecting shaft 15, the urging force of the main spring 36 urges the connecting shaft 15 in the counterclockwise direction. Have been.

In this state, the tongue is removed from the buckle, and the solenoid 46 is demagnetized. Therefore,
The plunger 46a is held at the projecting position by the pressing force of the return spring 47. In this state, the clutch claw 45 at the tip of the pivot lever 44 is
It is separated from the first tooth portion 41a.

As a result, the clutch gear 41 rotates counterclockwise by the urging force of the additional spring 34, and absorbs the slack of the tape 51 during the rotation. That is, the tape 51 is tightly wound around the outer periphery of the connecting shaft 15 and the leaf spring 54, and is in a state of being tensioned between the tape outer end holding portion 53 on the clutch gear 41 side. The urging force of the additional spring 34 in the belt winding direction is applied to the connecting shaft 15 via the tape 51.

FIG. 5A corresponds to this state.

II. A state in which the belt is pulled out for wearing, and the tongue is attached to the buckle. When the occupant pulls out the belt B when wearing the belt, the belt reel 16, the main shaft 14, and the connecting shaft 15 The three members (hereinafter, also referred to as the main shaft 14 and the like) rotate in the pull-out direction (clockwise in FIGS. 1 and 2), and wind the main spring 36 through the inner end locking groove 15a of the connecting shaft 15. To go. At the same time, the additional spring 34 and the leaf spring 54 are
Is also tightened.

This winding operation corresponds to the operation of pulling out the belt B to the right in the state of FIG. 5 (a). That is, the seat belt B is pulled out against the urging force of both the springs 34 and 36.

When the occupant connects the tongue of the pulled out seat belt B to the buckle member, the switch 22 in the buckle member is turned on to excite the electromagnetic solenoid 46, so that the plunger 46a is attracted and pivoted. The lever 44 is turned in the direction of arrow H in FIG. As a result, the clutch pawl 45 meshes with the teeth 41a of the clutch gear 41, locking the rotation of the gear 41 in the belt winding direction and transmitting the urging force of the additional spring 34 in the winding direction to the belt B. No state. This state corresponds to FIG. 5 (b).

III. After coupling the tongue and the buckle member,
The occupant turns his hand away from the buckle and turns to the front of the vehicle. When the occupant joins the tongue of the seat belt B and the buckle member, the upper body is twisted. It is drawn out more than the drawer length. FIG. 5B shows this state.

When the occupant turns to the front after the buckle is attached, the urging force of the additional spring 34 in the winding direction is not transmitted to the tape B. It is rewound until it fits the occupant's body only by the power (the state of FIG. 5 (c)).

In the state shown in FIG. 5B, the clutch gear 4
The tape 51 that has been in a tension state between the first shaft 1 and the connecting shaft 15 starts to loosen as the main shaft 14 and the like rotate counterclockwise when the tape 51 is rewound only by the urging force of the main spring 36.

Accordingly, as shown in FIG. 4, the tape 51 is loosely wound on a leaf spring 54 provided on the connecting shaft. In the state as shown in FIG. 5 (c), only the urging force of the main spring 36 is applied to the belt B, so that the belt B fits softly to the occupant, and the feeling of oppression to the occupant is reduced. Significantly reduced.

IV. When the occupant shifts from the normal sitting posture to the deep forward leaning posture after the occupant shifts to the deep forward leaning posture after the belt is attached, the belt B is pulled out accordingly.
Until the extra belt amount that has been rewound when the belt is worn is pulled out (the state shown in FIG. 5B), only the main spring 36 is tightened and pulled out.

When the excess belt amount is reached, the tape 51 changes to a tension state between the clutch gear 41 and the connecting shaft 15, and the clutch gear 41 is moved clockwise through the tensioned tape 51. Rotated in the direction.

At this time, since the teeth 41a of the clutch gear 41 are in the forward direction with respect to the clutch pawl 45, the function of preventing the clutch pawl 45 from rotating the clutch gear 41 does not work. (Even if the pawl 45 is engaged with the teeth 41a of the clutch gear 41, the clutch gear 41 can rotate clockwise in FIG. 2.) The seat belt exceeds the point where the extra belt amount is pulled out. When the belt B is pulled out, the belt B is pulled out while winding the additional spring 34 and the main spring 36, that is, in a heavy state in which the combined biasing force of the two springs is applied to the belt B. become.

V. State when the occupant returns to a normal sitting posture after a deep forward leaning posture When the occupant returns to a normal sitting posture after taking a deep forward leaning posture, the urging force of the main spring 36 is applied to the seat belt B. Just get caught by. This is based on the same reason as that described in the section of the state when the hand is released from the belt after the tongue and the buckle member are connected to the above-mentioned III.

That is, in this state, the teeth 41 a of the clutch gear 41 are engaged with the clutch pawl 45, and the rotation of the clutch gear 41 in the winding direction (counterclockwise) is prevented by the clutch pawl 45. Is done. Therefore, the seat belt B is urged only by the main spring 36.

VI. The state when the tongue and the buckle member are released for dismounting. When the tongue of the seat belt B is released from the coupling with the buckle member, the switch 22 in the buckle member is turned off and the solenoid 46 is demagnetized. As a result, the plunger 46a returns to the projecting position by the pressing force of the return spring 47. As a result, the pivot lever 44 rotates counterclockwise in FIG. 2 (the direction opposite to the arrow H direction), and the engagement of the clutch pawl 45 with the tooth portion 41a of the clutch gear 41 is released. Therefore, the clutch gear 41
Is rapidly rotated in the winding direction (counterclockwise) by the urging force of the additional spring 34 to guide the tape 51 into a tensioned state. However, when the urging force of the additional spring 34 is suddenly applied to the tape 51 in this manner, the leaf spring 54 of the connecting shaft 15 bends as shown by the arrow M in FIG. 4 to absorb the impact. After the tape 51 is tensioned, the additional spring 34 urges the belt B in the winding direction together with the main spring 36. Therefore, the belt B is quickly wound on the belt reel 16.

As described above, in the seat belt retractor of this embodiment, when the tongue is removed from the buckle, the clutch gear 41 is pulled by the additional spring 34 and rotates rapidly. Then, the tape 51, which has been loosened up to that time, is rapidly wound and tightened, and finally the tension for attaching the additional spring 34 is applied to the seat belt B. At the moment when the tape 51 is tensioned, the leaf spring 54 absorbs the impact and no collision occurs between the members, so that the generation of the mechanical impact sound is reliably prevented.

Although one embodiment has been described above, the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention. For example, the clutch mechanism is not limited to the structure shown in the drawing, and it goes without saying that an appropriate mechanism may be adopted.
It may also serve as a detection means for a warning circuit for notifying the occupant of the success or failure of the connection state. Further, one end of the leaf spring provided on the connection shaft may be embedded in the connection shaft or fixed with screws or the like. In the present invention, the inner end of the tape 51 may be connected to the leaf spring 54.

[0076]

As described above, the seat belt retractor of the present invention can maintain a sufficient belt retracting force, and does not give an occupant an unnecessary feeling of pressure during normal wearing.
Moreover, no impulsive sound is generated immediately after the tongue dissociation.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a seat belt retractor according to the present invention.

FIG. 2 is a left side view of the winding device with a partial cross section.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is an enlarged sectional view of a main part along line IV-IV in FIG. 3;

FIG. 5 is a schematic view for explaining in principle the operation of the device of the present invention.

FIG. 6 is a schematic view for explaining in principle the operation of Japanese Patent Application No. 62-297467.

FIG. 7 is a schematic view for explaining in principle the operation of Japanese Utility Model Application Laid-Open No. 63-52656.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Take-up mechanism part 14 Main shaft 15 Connection shaft 16 Belt reel 20 Coupling state detection part 21 Buckle 22 Switch 30 Biasing mechanism part 33 Outer end locking part 34 Additional spring 35 Housing 36 Main spring 40 Clutch mechanism part 41 Clutch gear 42 Clutch pawl mechanism 44 Pivot lever 45 Clutch pawl 46 Solenoid 46a Plunger 50 Tape memory unit 51 Tape 54 Leaf spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-141147 (JP, A) JP-A-5-213156 (JP, A) JP-A-5-24508 (JP, A) 52656 (JP, U) Japanese Utility Model 5-52012 (JP, U) Japanese Utility Model 3 122968 (JP, U) Japanese Utility Model 4-7260 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) B60R 22/12-22/48

Claims (3)

(57) [Claims] 1. A reel 1 for winding up a seat belt.
6, a frame 11 for rotatably holding the reel,
A spring for urging the reel 16 in the seat belt winding direction; a main spring 36 for constantly urging the reel 16 in the winding direction; and a spring for urging the reel 16 in the winding direction. An additional spring 34 provided to the reel 16 is provided, and the main spring 36 and the additional spring 34 are arranged in parallel. A seat belt retractor, wherein the urging force of the additional spring 34 is applied to the reel 16. A tape 5 that is provided in the middle of the power transmission path for transmitting and transmits the urging force of the additional spring 34 to the reel.
A driven member 41 that is connected to the reel-side end of the additional spring 34 and moves with the end of the additional spring 34 when the reel-side end moves; With the additional spring 3
A locking member 45 that locks the driven member 41 that has moved together with the end of the driven member 41 and that prevents the driven member 41 from retreating due to the urging force of the additional spring; The tape 51 is wound around an outer peripheral surface of a tape winding member 15 which rotates integrally with the reel 16. A belt winding device, wherein an elastic member 54 is interposed between an outer peripheral surface of the tape winding member 15 and a tape 51 wound therearound. 2. The elastic member according to claim 1, wherein
Is attached at one end to the tape winding member 15,
A seat belt winding device comprising a leaf spring extending along the outer peripheral surface of the tape winding member 15 and having the other end separated from the outer peripheral surface of the tape winding member 15. 3. A reel 1 for winding up a seat belt.
6, a frame 11 for rotatably holding the reel,
A spring for urging the reel 16 in the seat belt winding direction; a main spring 36 for constantly urging the reel 16 in the winding direction; and a spring for urging the reel 16 in the winding direction. An additional spring 34 provided to the reel 16 is provided, and the main spring 36 and the additional spring 34 are arranged in parallel. A seat belt retractor, wherein the urging force of the additional spring 34 is applied to the reel 16. A tape 51 is provided in the middle of the power transmission path for transmitting the power, and is connected to a tape 51 for transmitting the urging force of the additional spring 34 to the reel 16. The tape 51 is connected to the reel-side end of the additional spring 34. A driven member 41 that moves together with the reel-side end when the end moves, and an additional spring 3 that moves with the unwinding of the seat belt.
A locking member 45 that locks the driven member 41 that has moved together with the end of the driven member 41 and that prevents the driven member 41 from retreating due to the urging force of the additional spring; The tape 51 is wound around an outer peripheral surface of a tape winding member 15 which rotates integrally with the reel 16. In the belt winding device, a cushioning member is provided in a power transmission path for transmitting a biasing force from the additional spring 34 to the reel 16 for reducing an impact tension applied to the tape 51. Seat belt winding device.