JPH092201A - Webbing take-up device - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the locking means from operating in the fully retracted state of the webbing, and to achieve it reliably with a simple structure. According to the relative rotation of the V gear 32 with the spool 18 in the webbing take-up direction, a locking means is operated to prevent the spool 18 from rotating in the webbing withdrawal direction.
As the webbing is taken up from the fully pulled-out state, first, the incomplete gear portion 112 of the spool-side gear 100 repeatedly meshes / disengages with the intermittent rotation gear portion 126 of the intermediate gear 122 to rotate the spool-side gear 100. Intermediate gear 12
2 is transmitted intermittently. Before reaching the fully retracted state of the webbing 28, the continuous rotation gear unit 1 of the intermediate gear 122 is provided.
28 is the complete gear portion 114 of the spool side gear 100, and V
The rotation of the spool-side gear 100 is continuously transmitted to the V-gear-side gear 120 by meshing with the gear-side gear 120, and the operation of the locking means is prevented in the fully stored state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a webbing retractor used in a vehicle seat belt device.

[0002]

2. Description of the Related Art In a webbing retractor, usually, the webbing can be pulled out and taken up freely, but when the vehicle is suddenly decelerated, the webbing is prevented from being pulled out to restrain an occupant.

For this purpose, the following structure is adopted. That is, the spool is rotatably supported by the frame, and the webbing is wound around the spool. On the other hand, a V gear is provided coaxially with the spool and rotatable relative to the spool.

The V gear is provided with engaging teeth as external teeth on its peripheral portion, and an acceleration sensor is provided facing the engaging teeth.
In the acceleration sensor, the V pawl is engaged with the engaging teeth of the V gear by the inertial movement of the ball as the vehicle decelerates,
Rotation of the V gear in the webbing pull-out direction is prevented. The V gear is biased by the rotation of the spool and normally rotates together with the spool. However, when the rotation of the V gear in the webbing withdrawal direction is blocked, the webbing is pulled to move the spool in the webbing withdrawing direction. It rotates relative to the V gear (in other words, the V gear rotates relative to the spool in the webbing winding direction).

A lock plate is provided between the V gear and the spool. The lock plate has a lock claw and faces the lock claw, and the lock tooth is provided on the frame side (the lock plate and the lock tooth have locking means). Are configured). When the V gear and the spool rotate integrally, the lock claws of the lock plate are disengaged from the lock teeth, but when the V gear rotates relative to the spool and the webbing take-up direction, the lock claws move outward in the radial direction of the spool. It projects toward the side and engages with the lock teeth (the lock means is activated), and rotation of the spool in the webbing withdrawal direction is blocked.

This functions as a so-called VSIR vehicle-body-sensitive webbing retractor.

On the other hand, there is one provided with a W pawl. That is, the W pawl configured by the inertial mass body is provided eccentrically with the V gear. The W pawl is biased by the rotation of the V gear and normally rotates together with the V gear. However, when the webbing is pulled rapidly, an inertial force in the webbing winding direction is applied to the W pawl, and the W pawl is , And moves relative to the V gear in the webbing winding direction. As a result, the pawl claws formed on the outer periphery of the W pawl project outward in the radial direction of the V gear,
It engages with the W tooth, which is provided as an internal tooth on the frame side so as to face the pawl claw, and prevents the V gear from rotating in the webbing pull-out direction. When rotation of the V gear in the webbing pull-out direction is blocked, the spool is pulled in the webbing pull-out direction by pulling the webbing as in VSIR.
By rotating relative to the gear, the locking means is activated to prevent rotation of the spool in the webbing withdrawal direction.

This functions as a webbing-sensitive webbing retractor called a so-called WSIR.

A device that performs both the VSIR and WSIR functions is called a so-called DSIR.

[0010]

By the way, the spool is biased in the webbing winding direction by a retractor spring, and the webbing is pulled out against the biasing force to mount the webbing. When the webbing is unwound, it is wound onto a spool by a retractor spring. At this time, when the webbing is rapidly wound around the spool and reaches the fully wound state or the fully retracted state (a state in which the webbing cannot be further wound), the V gear is inertial when the winding of the webbing is stopped and the V gear is in the winding direction. There is a case where the locking means is activated by rotating relative to the hesspool.

In this case, it is necessary to pull the webbing to wind and squeeze the webbing, and then rewind the webbing to cause return relative rotation between the V gear and the spool in order to release the locking operation of the locking means. There is.

As a means for preventing the locking means from being locked when the webbing is fully stored, the following is known.

That is, a sensing member is provided for sensing the winding diameter of the webbing. The sensing member is disengaged from the V gear and the spool when the winding diameter is large, and operates to press the V gear and the spool together when the winding diameter becomes smaller than a predetermined value. After the pressing, the V gear and the spool rotate together so that the V gear and the spool do not rotate relative to each other. If the predetermined value at which the sensing member operates is set to the size of the winding diameter before the webbing reaches the fully retracted state, the V gear does not rotate in the webbing retracting direction relative to the spool in the fully retracted state of the webbing. The locking mechanism does not work.

However, since the pressing force is used to rotate the V gear and the spool integrally in the means provided with the sensing member which senses the winding diameter and operates, the V gear and the spool are opposed to each other against the pressing force. There is a lack of certainty in preventing relative rotation between the V gear and the spool in the fully stored state, such as the possibility of relative rotation occurring between the two. Also, the structure is complicated.

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to provide a webbing retractor which prevents the locking means from operating in the fully retracted state of the webbing and achieves it with a simple structure.

[0016]

In order to solve the above-mentioned problems, a webbing retractor of the present invention according to a first aspect of the present invention is a spool that is rotatable and that allows the webbing to be withdrawn and retracted, and this spool. A winding attachment urging means for urging the webbing in the webbing take-up direction, an actuating rotator that is rotatable relative to the spool coaxially with the spool, and an actuating rotator following means for rotating the actuating rotator following the spool. Locking means, which is actuated by the relative rotation of the actuating body against the actuating body following means, relative to the spool in the webbing take-up direction, and prevents rotation of the spool in the webbing pull-out direction; With an imperfect gear part that rotates integrally with it and has fewer teeth than the number of teeth determined by the module, and the number of teeth is determined by the module A spool-side gear having a complete gear portion having teeth, which is the number of teeth, arranged in the axial direction, an operating-rotor-side gear that rotates integrally with the operating-rotating body coaxially with the operating-rotating body, and the spool-side gear and operating rotation An intermediate gear provided between the body-side gear and the body-side gear, the intermediate gear rotates within a range of less than one rotation, and meshes / disengages with the incomplete gear portion of the spool-side gear repeatedly to cause the webbing to be completely pulled out. The rotation of the spool-side gear is intermittently transmitted by the rotation of the spool-side gear and the rotation of the spool-side gear is meshed with the complete gear portion of the spool-side gear until the webbing is fully retracted. A continuous rotation gear portion, which is continuously transmitted and meshes with the operating-rotor-side gear to continuously transmit rotation to the V gear to rotate the V gear integrally with the spool, is defined along the circumferential direction. A serial intermediate gear, and wherein the structure comprises a.

According to a second aspect of the present invention, in the webbing retractor according to the first aspect, the incomplete gear portion of the spool-side gear is formed in the same circle as the tip circle of the incomplete gear portion. It is characterized in that it has a restricting surface which engages with the intermittent rotation gear portion so as to prevent the rotation of the intermediate gear during non-engagement among the repeated engagement / non-engagement of the incomplete gear portion.

According to a third aspect of the present invention, in the webbing retractor according to the first aspect, the actuating rotor is a V gear having engaging teeth on its peripheral portion, and the acceleration due to the sudden deceleration of the vehicle is increased. It is characterized in that a V pawl is provided which engages with the engaging teeth by operation to prevent rotation of the actuating rotor in the webbing pull-out direction.

[0019]

According to the above construction, normally, the operating rotary member rotates integrally with the spool, and the webbing can be freely drawn and wound.

The webbing is attached by pulling out the webbing against the winding attachment biasing means. When the webbing is unwound, it is wound onto the spool by the winding attachment force means.

At the time of sudden deceleration of the vehicle, for example, as described in claim 3, the V pawl is engaged by the action of acceleration with the engaging teeth of the operating rotary member constituted by the V gear, and the webbing withdrawal of the operating rotary member is performed. Directional rotation is blocked. When the webbing is pulled in this state, the spool relatively rotates in the webbing withdrawing direction with respect to the operating rotor (in other words, the operating rotor rotates in the webbing winding direction with respect to the spool). The locking means is actuated by relative rotation of the operating rotor in the webbing winding direction, and rotation of the spool in the webbing withdrawal direction is blocked. This prevents the webbing from being pulled out and restrains the occupant.

When the webbing is taken up from the fully pulled out state, the spool-side gear rotates integrally with the spool accordingly. First, the incomplete gear portion of the spool-side gear repeatedly meshes / disengages with the intermittent rotation gear portion of the intermediate gear, and the rotation of the spool-side gear is intermittently transmitted to the intermediate gear.

At this time, according to the second aspect of the present invention, when the incomplete gear portion is not meshed among the repeated meshing / non-meshing portions, the regulating surface engages with the intermittent rotation gear portion to rotate the intermediate gear. Is prevented, and stable intermittent rotation is obtained. .

By the time the webbing reaches the fully retracted state, for example, before reaching the fully retracted state, the continuously rotating gear portion of the intermediate gear meshes with the complete gear portion of the spool side gear, and the rotation of the spool side gear is prevented. When continuously transmitted to the intermediate gear, and when the continuous rotation gear portion of the intermediate gear meshes with the complete gear portion of the spool side gear, the continuous rotation gear portion of the intermediate gear meshes with the operating rotor side gear, which , The rotation of the spool side gear is continuously transmitted to the operating rotor side gear via the intermediate gear, and the spool side gear and the operating rotor side gear rotate integrally, that is, the spool and the operating rotor rotate integrally. As a result, relative rotation between the spool and the actuating rotor is prevented.

The webbing may be unwound, and the webbing may be rapidly wound up on the spool to reach the full winding state or the full storage state (a state in which the webbing cannot be further wound). By the time the full storage state is reached, the spool-side gear and the operating rotor side gear rotate together and the relative rotation between the spool and the operating rotor is blocked. Even if the winding is stopped, the operating rotor does not rotate relative to the spool in the webbing winding direction. The operation of the locking means in the fully stored state is prevented.

The V gear and the spool are integrally rotated by meshing the intermediate gear with the spool and the operating rotator, and the relative rotation between the V gear and the spool is prevented in the fully stored state. Certainty is increased. Also, the structure is simple. Furthermore, a large reduction ratio is obtained by the structure in which the rotation of the spool is intermittently transmitted to the intermediate gear, and even if the spool requires a large number of rotations from the fully retracted state of the webbing to the fully retracted state, the intermediate gear must be large. Needless to say, the intermittent rotation gear portion and the continuous rotation gear portion can be provided within the range of one rotation.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A webbing retractor according to an embodiment of the present invention will be described with reference to FIGS. In the figure, an arrow FR indicates the front of the vehicle, an arrow W indicates the vehicle width direction, and an arrow U indicates the upper side of the vehicle.
Each is shown by P.

As shown in FIG. 1, the frame 12 is provided with a pair of leg pieces 14 and 16 facing each other in the vehicle front-rear direction and is bent and formed in a U shape, and a spool 18 is stretched between the leg pieces 14 and 16. Be done. The spool 18 has an axial direction in which the leg pieces 14 and 16 face each other, and is provided with support shafts 20 and 22 at both ends. One of the support shafts 20 is pivotally supported on the sensor cover 24 side attached to the outer surface of the leg piece 14, and the other support shaft 22 is attached to the outer surface of the leg piece 16.
Is pivoted to the side. As a result, the spool 18 is
It is rotatable about 0 and 22. Spool 18
One end of the webbing 28 is locked to the webbing 2
The webbing 28 is wound around eight times, and the webbing 28 can be freely drawn and taken up with the rotation of the spool 18 (the webbing drawing-out direction is shown by an arrow A). The mainspring spring cover 26 accommodates a mainspring spring 30 as a winding attachment force means fitted to the support shaft 22, and the mainspring spring 30 moves the spool 18 in the webbing winding direction (direction opposite to arrow A). Energize the rotation. That is, the webbing 28 is biased toward the winding side.

Inside the sensor cover 24, a V gear 32 as an operating rotator is housed.
It is fitted to the outer periphery of 0 and is rotatable relative to the spool 18 coaxially with the spool 18. On the outer circumference of the V gear 32,
Engaging teeth 34 that are external teeth are formed. Sensor cover 2
Further, an acceleration sensor 36 is provided inside 4 in correspondence with the engaging teeth 34 of the V gear 32. The acceleration sensor 36 includes a ball 38 that receives acceleration due to sudden vehicle deceleration and inertially moves forward of the vehicle. A V-pawl 40 that rotates upward (rotates in the direction of arrow B) in accordance with the inertial movement of the ball 38 is provided. The V pawl 40 is engaged with the engaging tooth 34 by the upward rotation (by the rotation from the solid line position to the chain line position as shown in FIG. 6). The engagement between the V pawl 40 and the engaging teeth 34 of the V gear 32 prevents the V gear 32 from rotating in the webbing pull-out direction.

On the opposite side of the V gear 32 from the spool 18,
A torsion spring 42 is provided as a means for following the operating rotor, and the central portion 44 of the torsion spring 42 is curved in an arc shape around the boss portion 33 of the V gear 32 that penetrates the support shaft 20, The one end portion 46 of the torsion spring 42 is bent toward the end surface of the V gear 32 and is locked in a locking hole 48 formed in the end surface of the V gear 32. The end portion 50 is bent toward the end surface of the V gear 32, penetrates through a through hole 52 formed in the end surface of the V gear 32, and engages in a locking hole 54 formed in the end surface of the spool 18. Be stopped. The V gear 32 includes a central portion 44 of the torsion spring 42.
Due to the elastic return deformation force in the radial direction, the spool 18
Is urged to follow the rotation of. Normally, the V gear 32 rotates integrally with the spool 18 by the urging force of the torsion spring 42. As shown in FIG. 7, when the webbing 28 is pulled and the spool 18 rotates in the webbing withdrawing direction while the rotation of the V gear 32 in the webbing withdrawing direction is blocked,
The other end 50 of the torsion spring 42 moves in the through hole 52 in the circumferential direction toward the radial direction of the torsion spring 42, and the spool 18 pulls out the webbing against the biasing force of the torsion spring 42. Direction relative to the V gear 32 (in other words, the V gear 32 rotates relative to the spool 18 in the webbing winding direction).

A lock plate (lock means) 55 is provided between the V gear 32 and the spool 18. The lock plate 55 is provided with a recess 56 in a part of the outer periphery thereof,
Corresponding to No. 6, a cylindrical protrusion 58 is provided on the end face of the spool 18.
Is formed so that the convex portion 58 is engaged with the concave portion 56. Further, the lock plate 55 is provided with a recess 60 on the side opposite to the recess 56 for allowing the support shaft 20 of the spool 18 to pass therethrough, and a pair of guide pins projecting toward the end face of the V gear 32 on both left and right sides of the recess 60. 62. Guide pin 62
Corresponding to the above, a guide recess 64 is provided in the end surface of the V gear 32, and the guide pin 62 is engaged in the guide recess 64. A plurality of lock claws 66 are also formed on the outer periphery of the lock plate 55. Corresponding to the lock claws 66, the spool 18 is provided at the edge of the opening of the leg piece 14 through which the end of the spool 18 is inserted.
A lock tooth 68 (locking means) is formed coaxially with the inner tooth.

When the spool 18 and the V gear 32 rotate integrally, the guide pin 62 is located at one end of the guide recess 64, and the lock plate 55 rotates together with the spool 18 and the V gear 26, as shown in FIG. And then lock claw 6
6 is separated from the lock teeth 68. As shown in FIG. 7, when the spool 18 relatively rotates in the webbing pull-out direction while the rotation of the V gear 32 in the webbing pull-out direction is blocked, the lock plate 55 moves relatively to both the spool 18 and the V gear 32. To do. That is, the concave portion 56 of the lock plate 55 is pushed and moved by the convex portion 58 of the spool 18, and the guide pin 62 is moved by the guide concave portion 64.
The inside is moved toward the other end, and the lock claw 66 of the lock plate 55 is engaged with the lock tooth 68 so as to project outward in the radial direction of the spool 18 (the lock means is activated). By the engagement, the rotation of the spool 18 in the webbing withdrawing direction is blocked, the withdrawal of the webbing 28 is stopped, and the occupant is restrained.

This functions as a so-called VSIR vehicle-body sensitive webbing retractor.

On the other hand, a W pawl 70 composed of an inertial mass body is provided between the V gear 32 and the sensor cover 24, and the W pawl 70 has a passage hole 72 for passing the boss portion 33 of the V gear 32. It has a ring shape. On the eccentric axis line that is eccentric with the axial center of the V gear 32, the pin shaft 74 protruding from the end surface of the V gear 32 is fitted into the pin hole 76 formed in the W pawl 70, whereby the W pawl 70. Is supported by the V gear 32 so as to be rotatable around the pin shaft 74.

Between the W pawl 70 and the V gear 32, W
A coil spring 78 is provided as a follower, and one end of the coil spring 78 is formed on the W pawl 70.
0, and the other end is locked by a locking projection 82 formed on the end surface of the V gear 32. Further, a part of the outer circumference of the W pawl 70 is cut out, and a stopper 86 is provided in a projecting manner on the end face of the V gear 32 in correspondence with the cutout notch 84, and the stopper is driven by the urging force of the coil spring 78. 86 is urged to abut the notch 84, which normally causes the W pawl 70 to rotate integrally with the V gear 32.

A pawl claw 88 is formed on the outer circumference of the W pawl 70, and a W tooth 9 which is an internal tooth coaxial with the spool 18 is formed on the sensor cover 24 so as to face the outer circumference of the pawl claw 88.
0 is formed. When the webbing 28 is rapidly pulled out and the inertial force in the webbing winding direction is applied to the W pawl 70, the W pawl 70 resists the biasing force of the coil spring 78,
It rotates around the pin shaft 74 (rotates in the direction of arrow C from the position shown by the solid line to the position shown by the chain line in FIG. 8) so as to move relatively in the webbing winding direction, and the pawl claw 88 becomes the W tooth 90. It projects outward from the disengaged position and engages with the W tooth 90, which prevents the V gear 32 from rotating in the webbing pull-out direction. By blocking the rotation of the V gear 32 in the webbing pull-out direction, if the webbing 28 is pulled and the spool 18 relatively rotates in the webbing pull-out direction, the locking means is locked, as described above.

This functions as a so-called WSIR webbing-sensitive webbing retractor.

This embodiment fulfills both functions of VSIR and WSIR, which is so-called DSIR.

As shown in FIG. 2, the spindle 2 of the spool 18
No. 0 is provided with a spool side gear 100 coaxially therewith. The support shaft 20 has a large diameter portion 102 having a large diameter at the base end portion.
And a small diameter portion 104 having a small diameter at the tip portion, and a split groove 106 is formed in the large diameter portion 102 in the axial direction. The spool-side gear 100 includes a through hole 108 through which the small diameter portion 104 penetrates, and a fitting claw 110 that is inserted and fitted in the split groove 102 in the axial direction, and rotates integrally with the spool 18.

The spool-side gear 100 has an incomplete gear portion 112 having teeth 112A whose number of teeth is less than the number of teeth determined by the module (a value obtained by dividing the diameter of the pitch circle by the module), and the number of teeth. A complete gear portion 114 having teeth 114A whose number of teeth is determined by the module is arranged in parallel along the axial direction. The complete gear portion 114 is located on the spool 18 side, and the incomplete gear portion 112 is located on the opposite side. The teeth of the imperfect gear portion 112 and the teeth of the perfect gear portion 114 have the same number of teeth determined by the module (for example, 6 teeth), but the imperfect gear portion 112 is adjacent to each other. Only two teeth are provided and the other four teeth are not provided, and the complete gear portion 114 has a shape having all six teeth. The incomplete gear portion 112 is the remaining portion between the teeth of the incomplete gear portion 112 and the complete gear portion 114 in the axial direction except the portion corresponding to the tooth between the two teeth of the incomplete gear portion 112. It has an outer peripheral surface (regulating surface 118) formed in the same circle as the tip circle of the portion 112.

On the boss portion 33 of the V gear 32, a V gear side gear (actuating body side gear) 120 that penetrates the support shaft 20 of the spool 18 is provided coaxially with the boss portion 33, and the V gear side gear 120 is It has one tooth 120A which rotates together with the V-gear 32 and whose number of teeth is determined by the module, which is the same as the complete gear part 114, for example 6 teeth.

Spool side gear 100 and V gear side gear 12
An intermediate gear 122 whose axial direction is parallel to the axial direction of the spool 18 is provided between 0 and 0. Intermediate gear 122
Is rotatably supported on the sensor cover 24 by a gear shaft 124, and has an intermittent rotation gear portion 126 and a continuous rotation gear portion 128 which are defined in the circumferential direction. The intermittent rotation gear portion 126 has teeth whose number of teeth is the number of teeth determined by the module, and the tooth width is large or small for each tooth (in FIGS. 2 to 4, 126 A has a large tooth width, The tooth having a small tooth width is indicated by 126B), and when viewed along the gear axis direction, in the portion corresponding to the tooth 112A of the incomplete gear portion 112 of the spool side gear 100 (see FIG. 5), , The number of teeth is determined by the module, but all the teeth exist, but in the portion corresponding to the restriction surface 118 of the incomplete gear portion 112 (see FIG. 5), one tooth It is set as a nonexistent mode. As the webbing 28 is taken up from the fully pulled-out state and the spool 18 rotates in the webbing take-up direction, the incomplete gear portion 112 of the spool-side gear 100.
Teeth 112A of the intermediate gear 122 of the intermittent rotation gear portion 12
6 meshes with the teeth 126A, 126B repeatedly (meshed state is shown in FIG. 4 and non-meshed state is shown in FIG. 5) to rotate the spool-side gear 100 (spool 18
Of rotation) is intermittently transmitted to the intermediate gear 122. That is, the intermediate gear 122 is fed by two teeth while the spool-side gear 100 makes one rotation. As shown in FIG. 5, at the time of non-meshing, the restriction surface 118 is located between the teeth 126 </ b> A having a large tooth width of the intermittent rotation gear portion 122 in a portion where there is no tooth for each tooth. 126C is slidably engaged to prevent rotation of the intermediate gear 122.

The continuous rotation gear portion 128 has teeth 128A whose number of teeth is the number of teeth determined by the module, and when viewed along the gear axis direction, the teeth 114A of the complete gear portion 114 of the spool side gear 100 and the teeth 114A. Tooth 1 of V gear side gear 120
20A (see FIG. 5) in common. In addition, when viewed along the axial direction, the continuous rotation gear portion 128 is
A portion of the spool-side gear 100 corresponding to the incomplete gear portion 112 does not interfere with the teeth of the incomplete gear portion 112 and the restriction surface 118 (does not interfere with continuous rotation described later).
As long as there is no tooth. The teeth 128A of the continuous rotation gear portion 128 are the same as the teeth 114A of the complete gear portion 114 of the spool-side gear 100 before the webbing 28 reaches the fully wound state or the fully retracted state (for example, before reaching the fully retracted state). Mesh with the spool side gear 10
The rotation of 0 is continuously transmitted to the intermediate gear 122, and the rotation of the spool side gear 100 is continuously transmitted to the V gear 32 via the intermediate gear 122 by meshing with the teeth 120A of the V gear side gear 120. , V gear 32 rotates integrally with spool 18. The intermediate gear 122 rotates within a range not exceeding one rotation according to the rotation of the spool 18 accompanying the winding of the webbing 28 from the fully pulled-out state to the fully-stored state. For example, while the spool rotates 16 times, The gear 122 rotates while being decelerated so as not to exceed one rotation. The diameters of the pitch circles of the intermediate gear, the spool side gear, and the V gear side gear are set so that such deceleration is possible.

When viewed in the gear axis direction, the intermittent rotation gear portion 126 has no teeth in the portion corresponding to the complete gear portion 114, and the intermittent rotation gear portion 126 and the incomplete gear portion 112 are not separated from each other. When the rotation of the spool side gear 100 is intermittently transmitted to the intermediate gear 122 by repeating meshing / non-meshing, the V gear side gear 120 does not mesh with the intermediate gear 122 and the V gear 32 does not move. It is possible to rotate relative to. The position of the continuously rotating gear portion 128 of the intermediate gear 122 when the V gear 32 is rotatable relative to the spool 18 is shown in FIG. 9, and the V gear 32 is integrated with the spool 18 via the V gear side gear 120. Intermediate gear 1 when rotating
The positions of the 22 continuous rotation gear portions 128 are shown in FIG.

The intermediate gear 122 is used for the sensor cover 24.
The boss portion 33 of the V gear 32 penetrates through the sensor cover 24 and is rotatably supported by the boss portion 33 of the V gear 32, whereby the support shaft 20 of the spool 18 is rotatably supported.
The V gear side gear 120 projects to the outer surface side of the sensor cover 24, and the spool side gear 100 also projects to the outer surface side of the sensor cover.

According to the above structure, normally, the V gear 32 rotates integrally with the spool 18, and the webbing 28 can be freely drawn and wound.

Webbing 28 against spring spring 30
And the webbing 28 is attached. When the webbing 28 is unmounted, the webbing 28 is wound around the spool 18 by the spiral spring 30.

At the time of sudden deceleration of the vehicle, the V pawl 40 is engaged with the engaging teeth 34 of the V gear 32 by the action of acceleration,
The rotation of the V gear 32 in the webbing pull-out direction is prevented.
When the webbing 28 is pulled in this state, the spool 1
8 rotates relative to the V gear 32 in the webbing pull-out direction (in other words, the V gear 32 rotates relative to the spool 18 in the webbing winding direction). The relative rotation of the V gear 32 in the webbing take-up direction activates the locking means to prevent the spool 18 from rotating in the webbing pull-out direction. This prevents the webbing 18 from being pulled out and restrains the occupant.

Here, when the webbing 28 is wound up from the fully pulled out state, the spool side gear 100 rotates integrally with the spool 18 accordingly. First, the imperfect gear portion 112 of the spool-side gear 100 repeatedly meshes / disengages with the intermittent rotation gear portion 126 of the intermediate gear 122, and the rotation of the spool-side gear 100 is intermittently transmitted to the intermediate gear 122.

At this time, when the incomplete gear portion 112 is not meshed among the meshing / non-meshing that is repeated, the restriction surface 1
18 engages with the intermittent rotation gear portion 126 to engage the intermediate gear 122.
Rotation is blocked, and stable intermittent rotation is obtained.

By the time the webbing 28 reaches the fully retracted state, for example, before reaching the fully retracted state, the continuous rotation gear portion 128 of the intermediate gear 122 has the spool-side gear 100.
Of the spool side gear 100 by meshing with the complete gear portion 114 of
Is continuously transmitted to the intermediate gear 122, and when the continuous rotation gear portion 128 of the intermediate gear 122 meshes with the complete gear portion 114 of the spool-side gear 100, the continuous rotation gear portion 128 of the intermediate gear 122 is This meshes with the V gear side gear 120, whereby the rotation of the spool side gear 100 is continuously transmitted to the V gear side gear 120 via the intermediate gear 122, and the spool side gear 100 and the V gear side gear 120 are integrated. Rotation, that is, the spool 18 and the V gear 32
Rotate integrally with each other, and relative rotation between the spool 18 and the V gear 32 is blocked.

There is a case where the webbing 28 is unwound and the webbing 28 is rapidly wound around the spool 18 to reach the fully wound state or the fully stored state (a state in which the webbing cannot be further wound). By the time the full storage state is reached, the spool-side gear 100 and the V-gear-side gear 120 rotate together and the spool 18 and the V-gear 32
Since relative rotation between the V gear 32 and the spool is prevented, the V gear 32 does not rotate relative to the spool 18 in the webbing take-up direction even if the winding is suddenly stopped in the fully stored state.
The operation of the locking means in the fully stored state is prevented.

The spool 18 and the V gear 32 are meshed with each other through an intermediate gear 122, and the V gear 32 and the spool 18 are meshed with each other.
Rotate in unison with each other, and the certainty of preventing relative rotation between the V gear 32 and the spool 18 in the fully stored state is enhanced. Also, the structure is simple. Further, a large reduction ratio is obtained by the structure in which the rotation of the spool 18 is intermittently transmitted to the intermediate gear 122, and even if the spool 18 requires a large number of rotations from the fully retracted state of the webbing 28 to the fully retracted state, the intermediate gear 122 is rotated. The 122 may include the intermittent rotation gear portion 126 and the continuous rotation gear portion 128 within the range of one rotation without increasing the size.

In the above embodiment, in order to perform the WSIR function, the W pawl 70 is used as a sensitive mass body, and the webbing is rapidly pulled due to the rapid vehicle deceleration, so that the W pawl 70 is subjected to an inertial force. , W pawl 70 has W teeth 9
The lock means is operated by engaging with 0 to prevent the V gear 32 from rotating in the webbing pull-out direction.
Not limited to that. For example, without providing the W pawl 70 as in the above-described embodiment, the V gear 32 is positively configured as an inertial mass body, and the webbing is rapidly pulled by the rapid deceleration of the vehicle so that the V gear 32 is wound in the webbing winding direction. Is applied to the spool 18 in the webbing pull-out direction.
The locking means may be operated directly by rotating relative to the lock means. In such a case, the V gear 32
Is particularly effective in that the V gear 32 is directly subjected to a large inertial force as a result of the positive construction of the inertia mass body.

In the above embodiment, the incomplete gear portion 112 of the spool side gear 100 and the intermediate gear 122 corresponding thereto.
By the intermittent rotation gear portion 126, the spool side gear 1
Although the rotation of 00 is intermittently transmitted to the intermediate gear 122, the intermittent mechanism for realizing the intermittent rotation is not limited to the above embodiment.

For example, in the first modification of the intermittent mechanism shown in FIG. 11, the intermittent rotation gear portion 202 of the intermediate gear 200 has teeth formed in two rows and in a staggered pattern, and the total number of teeth is modular. The number of teeth is determined. On the other hand, the incomplete gear portion 206 of the spool-side gear 204 has two teeth, that is, a tooth 206A that projects to one side in the diametrical direction and a tooth 206B that projects to the opposite side in the diametrical direction. An outer peripheral surface 210A corresponding to the teeth of one row of teeth 202A of 202 and formed on one half circumferential side between the teeth of two teeth 206A and 206B of incomplete gear portion 206, and teeth 202B of the other row. Corresponding to the space between the teeth, the two teeth 2 of the incomplete gear portion 206
The outer peripheral surface 210B is formed on the half circumferential side opposite to the tooth between the teeth 06A and 206B.

Incomplete gear portion 20 of the spool side gear 204
The two teeth 206A and 206B of No. 6 are the teeth 202A of one row of the intermittent rotation gear part 202 of the intermediate gear 200 and the teeth 2 of the other row.
02B alternately meshes and repeats meshing / non-meshing to intermittently rotate the intermediate gear 200. Further, at the time of non-meshing, the restricting surface 210 has a space between the teeth of one row of teeth 202A and another row. Tooth 202A alternately engages between the teeth of tooth 202B, and tooth 202A,
Sliding contact with the tooth surface of 202B prevents rotation of the intermediate gear 200. By one rotation of the spool side gear 204, the intermediate gear 200 is fed by two teeth.

In the second modified example of the intermittent mechanism shown in FIGS. 12 to 14, the incomplete gear portion 302 of the spool-side gear 300 has a spiral pitch circle and has only one tooth 3.
00A, and the restriction surfaces 304 are formed on both sides in the gear axis direction via the teeth 300A. On the other hand, each tooth 310 of the intermittent rotation gear portion 308 of the inter-gear 306 corresponds to the rotation direction of the intermediate gear 306 corresponding to the spiral pitch circle of the spool-side gear 300 when viewed along the axial direction. The direction is inclined.

Incomplete gear portion 30 of the spool-side gear 300
The second tooth 300A is the intermittent rotation gear portion 30 of the intermediate gear 306.
By repeating meshing / non-meshing with the respective teeth 308 of 8, the intermediate gear 306 is fed by one tooth for one rotation of the spool-side gear 300. At the time of non-meshing, the restriction surface 304 engages between the teeth of the teeth 310 of the intermittent rotation gear portion 308 of the intermediate gear 306, and comes into sliding contact with the tooth surfaces of the teeth 310 to prevent the rotation of the intermediate gear 306.

In the drawings relating to the first modification and the second modification, only the intermittent rotation gear part of the intermediate gear and the intermittent rotation gear part of the spool side gear are shown.

[0061]

According to the webbing take-up device of the present invention,
In the fully retracted state of the webbing, the locking means are not activated, which is reliably achieved with a simple construction.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a webbing retractor of the present invention.

FIG. 2 is an exploded perspective view showing a main part of the webbing retractor of this embodiment.

FIG. 3 is a perspective view illustrating the operation of the intermittent mechanism.

FIG. 4 is a view corresponding to FIG. 3 showing the next operation of FIG. 3;

FIG. 5 relates to a main part of the webbing retractor of the present embodiment,
It is explanatory drawing which shows the positional relationship in the axial direction of the spool of each gear.

FIG. 6 is a view showing the locking means as viewed from the axial direction of the spool.

FIG. 7 is a view corresponding to FIG. 6 showing the locking operation of the locking means.

FIG. 8 is a view showing the operation of the W pawl as seen from the axial direction of the spool.

FIG. 9 is a view showing the positional relationship between the intermediate gear and the gear on the operating rotor side, as viewed from the axial direction of the spool.

FIG. 10 is a view corresponding to FIG. 9 when the webbing reaches the fully stored state.

FIG. 11 is a perspective view showing a first modified example of the intermittent mechanism.

FIG. 12 is a perspective view showing a second modification of the intermittent mechanism.

FIG. 13 is a diagram of the second modification viewed along the gear axis direction.

FIG. 14 is a diagram of the second modification viewed from the gear axis direction.

[Explanation of symbols]

 18 Spool 28 Webbing 30 Spring Spring (Winding Attachment Force Means) 32 V Gear (Actuation Rotating Body) 34 Engaging Teeth 40 V Pawl 42 Torsion Spring (Actuation Rotating Body Following Means) 55 Lock Plate (Locking Means) 68 Lock Teeth (Locking means) 100 Spool side gear 112 Incomplete gear part 114 Complete gear part 118 Restriction surface 120 V gear side gear (actuating body side gear) 122 Intermediate gear 126 Intermittent rotation gear part 128 Continuous rotation gear part

Claims (3)

[Claims] 1. A spool that is rotatable and that allows the webbing to be pulled out and wound up freely; a winding attachment biasing means that biases the spool in the webbing winding direction; and a relative rotation relative to the spool that is coaxial with the spool. Of the operating rotor, the operating rotor following means for rotating the operating rotor on the spool, and the spool in the webbing take-up direction of the operating rotor that opposes the operating rotor following means. Locking means actuated by rotation to prevent rotation of the spool in the webbing withdrawal direction, and an incomplete gear that rotates integrally with the spool coaxially therewith and has fewer teeth than the number of teeth determined by the module. A spool-side gear having a portion and a complete gear portion having teeth whose number of teeth is determined by the module along the axial direction; An intermediate gear that is provided between the operating-rotor-side gear that rotates coaxially with the operating-rotator and integrally with the operating-rotator, and an intermediate gear that is provided between the spool-side gear and the operating-rotor-side gear. Rotates and meshes with the incomplete gear of the spool side gear /
The intermittent rotation gear part that intermittently transmits the rotation of the spool side gear accompanying the winding of the webbing from the fully pulled out state by repeating non-meshing and the complete gear of the spool side gear until the webbing is fully retracted. Rotation of the spool-side gear is continuously transmitted by meshing with the gear part, and rotation is continuously transmitted to the V-gear by meshing with the operating-rotor-side gear to rotate the V-gear integrally with the spool. A webbing take-up device comprising: 2. The incomplete gear portion of the spool-side gear is
Restriction for engaging with the intermittently rotating gear portion to prevent rotation of the intermediate gear when the incomplete gear portion is in non-engagement among the repeated meshing / non-meshing formed in the same circle as the tip circle of the incomplete gear portion The webbing retractor according to claim 1, having a surface. 3. The actuating rotor is a V gear having engaging teeth on its peripheral portion, and is engaged with the engaging teeth by the action of acceleration due to sudden vehicle deceleration in the webbing pull-out direction of the actuating rotor. The webbing retractor according to claim 1, further comprising a V pawl that prevents rotation.