JPH0572614U - Webbing retractor - Google Patents

Abstract

(57) [Abstract] [Purpose] When switching from ELR to ALR without increasing the accuracy of constituent parts, even if the locking means may engage with the next lock tooth, each constituent part So that it is not overloaded. [Configuration] When switching from ELR to ALR, the switching projection 104 moves counterclockwise as the webbing is pulled out, the release arm 102 rotates counterclockwise, and the switching projection 104 shifts. Push in the clockwise direction. The engagement lever 130 that receives this rotational force via the stopper 131 moves to the lock wheel 42 side from the neutral position, and is biased by the compression coil spring 98 so as to engage with the ratchet 46. At this time, the locking pin 1
38 is engaged with the switching projection 104, and the engagement lever 13
The engagement between 0 and the lock wheel 42 is prevented. After that, when the webbing is wound, the engagement between the engagement lever 130 and the lock wheel 42 is released as the switching projection 104 moves in the clockwise direction, and the engagement lever 130 is disconnected from the lock wheel 42. Engage.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a webbing retractor having both so-called ELR function and ALR function.

[0002]

[Prior Art]

 The webbing retractor has an ELR (Emergency Locking Retractor) function that allows the occupant restraint webbing to be pulled out and wound up during normal operation and prevents the webbing from being pulled out during a sudden vehicle deceleration, and during normal and sudden vehicle deceleration. Regardless of the type, some have an ALR (automatic locking retractor) function that prevents the webbing from being pulled out after the webbing is installed.

Conventionally, as this webbing retractor, the one described below is known. That is, the take-up shaft is rotatably supported by the frame, and the occupant restraining webbing can be taken up by the take-up shaft.The take-up shaft is provided with a lock ring via a spring member. The urging force of the spring member allows it to rotate following the winding shaft, and the urging force of the spring member makes it relatively rotatable with respect to the winding shaft.

The lock wheel is provided with a lock plate rotatable together with the lock wheel, and a ratchet wheel fixed to the frame is arranged around the lock plate. In addition, the lock wheel is formed with an elongated hole, and the lock plate is provided with a pin engaging with the elongated hole, so that the relative rotation between the lock wheel and the winding shaft causes the lock wheel to have an elongated hole. The pin is guided. As a result, the lock plate moves from the state in which the tooth-shaped claws formed on the lock plate disengage from the inner teeth (lock teeth) of the ratchet wheel to the predetermined relative rotational position and engages with the inner teeth of the ratchet wheel. It is said that. This prevents rotation of the winding shaft in the webbing pull-out direction.

Here, an inertial member is used in order to set the lock mechanism of the winding shaft to ELR. When an acceleration of a predetermined value or more in the webbing pull-out direction acts on the take-up shaft, the inertia force of the inertia member acts on the lock ring, and based on this inertia force, the take-up shaft resists the biasing force of the spring member. And the lock wheel are rotated relative to each other, and the claw portion of the lock plate meshes with the inner teeth of the ratchet wheel at a predetermined relative rotation position.

As a result, in normal times, the webbing can be freely wound and pulled out from the winding shaft, the occupant can take a free driving posture, and the webbing is prevented from being pulled out and the occupant is restrained when the vehicle suddenly decelerates. It

On the other hand, in order to set the lock mechanism of the take-up shaft to ALR, a switching pawl having an engaging claw that is releasably engaged with external teeth formed on the outer peripheral surface of the lock wheel is used. There is. According to this switching pawl, the engagement pawl is set to ELR in a state where it is disengaged from the outer teeth of the lock wheel, and the rotation of the lock wheel is blocked in a state in which the engagement pawl is engaged with the outer teeth of the lock wheel. It The switching pawl engages with the lock wheel when the webbing is pulled out by the maximum amount, and is disengaged from the lock wheel when the maximum amount is taken up. Therefore, when the webbing is pulled out by the maximum amount, the take-up shaft and the lock wheel rotate relative to each other, whereby the ALR state is established, and the pulling-out of the webbing is prevented regardless of the normal state and the rapid vehicle deceleration.

Further, in order to switch the lock mechanism of the winding shaft from ALR to ELR, when the webbing is maximally wound, the switching pawl is disengaged from the lock wheel and switched to ELR.

[0009]

[Problems to be solved by the device]

 In the conventional webbing retractor described above, the position of the lock wheel relative to the ratchet wheel when the lock wheel and the take-up shaft move relative to each other when the lock mechanism of the take-up shaft operates as the ELR. In some cases, the toes of the claws of the lock plate, or the tips of the teeth, do not mesh with the roots of the ratchet wheel in an appropriate state, and try to mesh with the next lock tooth. In this case, the direction of formation of the long hole of the lock wheel and the direction of movement of the outer teeth of the lock plate required to mesh with the inner teeth of the ratchet wheel coincide, that is, the position of the lock wheel with respect to the ratchet wheel is moved. Thus, a rotational force that rotates the lock wheel in the webbing pull-out direction is generated so that a predetermined relative rotational position between the lock wheel and the winding shaft is obtained. This rotational force exceeds the inertial force of the inertial member, and the lock wheel is forcibly rotated slightly, so that the guide hole direction of the lock wheel and the moving direction of the lock plate coincide with each other.

However, when switching from ELR to ALR, the maximum amount of webbing pulled out causes an acceleration of a predetermined value or more in the webbing pull-out direction to act on the take-up shaft, and based on the inertial force of the inertia member, the lock wheel The outer teeth of the lock plate may mesh with the inner teeth of the ratchet wheel in some cases due to relative rotation between the winding shaft and the winding shaft. In this case, the tip of the lock plate does not mesh with the root of the ratchet wheel in an accurate state, and the lock ring is forced to rotate in the webbing pull-out direction in an attempt to mesh with the next lock tooth. Rotational force is generated to match the direction of the long hole with the moving direction of the lock plate, but the engaging pawls of the switching pawl are already engaged with the outer teeth of the lock wheel and are in the ALR state. Rotation in the pull-out direction is blocked, which causes a load on each component.

In order to solve this, it is necessary to increase the strength of each component. Or, it is necessary to improve the manufacturing accuracy and assembly accuracy of each component so that the toes of the claws of the lock plate mesh with the lock teeth at an appropriate position when switching from ELR to ALR.

In view of the above facts, the present invention has an object to provide a webbing take-up device in which each component is not loaded when switching from ELR to ALR without increasing the accuracy of components.

[0013]

Means for Solving the Problems In order to solve the above problems, the present invention provides a relative rotation of a take-up shaft for taking up a webbing and a rotation that follows the take-up shaft and causes a rotation delay due to a sudden webbing pull-out. A member, a locking means for preventing the webbing pulling out of the winding shaft due to a rotation delay of the relative rotation member, a separation position spaced from the relative rotation member, and the relative rotation member in association with the relative rotation member. The engagement lever that can be moved to the engagement position that causes a rotation delay and is urged toward the separated position direction and the engagement position direction when the neutral position is exceeded, and the engagement by pulling out the web vigung above a predetermined value. The switching means for moving the lever toward the engagement position and the engagement lever that is moved in the engagement position direction when the webbing is pulled out by a predetermined value or more are brought into contact with each other to contact the engagement lever. Blocking means for blocking the engagement with the counter rotating member and for separating the engaging lever from the engaging lever by winding the webbing so that the engaging lever can be engaged with the relative rotating member. I am trying.

[0014]

[Action]

 According to the webbing take-up device of the present invention, when the engaging lever is located at the separated position separated from the relative rotating member (ELR) and the webbing is not suddenly pulled out, The rotating member does not cause rotation delay. Therefore, the webbing can be freely withdrawn without the webbing being withdrawn by the locking means.

On the other hand, when the engagement lever is located at the engagement position (ALR), the relative rotation member is delayed in rotation, and the webbing of the take-up shaft is prevented by the locking means.

In the webbing retractor according to the present invention, the switching from the ELR to the ALR is performed by pulling out the webbing by a predetermined value or more. When the webbing is pulled out beyond the predetermined value, the engagement lever is moved in the engagement position direction by the switching means. In this case, the engagement lever comes into contact with the blocking member and blocks engagement with the relative rotation member. When the webbing is wound from this blocking state, the blocking means separates from the engaging lever, the engaging lever engages with the relative rotating member, and the mode is switched to ALR.

As described above, in the present invention, when the webbing is pulled out and the ELR is switched to the ALR, the engaging lever abuts the blocking member and is prevented from engaging with the relative rotating member. The rotating member can freely rotate in the webbing pull-out direction.

Therefore, the locking means is constituted by a pair of members that can be meshed with each other, for example, a locking plate and a ratchet wheel fixedly arranged to the locking plate, and the locking plate is constructed by delaying the rotation of the relative rotating member. If the lock plate does not mesh with the ratchet wheel at the specified position and the pawl of the lock plate tries to mesh with the next lock tooth of the ratchet wheel, the relative rotation member Since it can freely rotate in the webbing pull-out direction and absorb the load, no load acts on each member.

[0019]

【Example】

 A webbing retractor according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7 (in the drawings, an arrow UP indicates the upper side of the vehicle).

In this webbing retractor, the frame 12 shown in FIG. 1 is fixed to the vehicle body by a mounting bolt (not shown). The frame 12 has a pair of leg plates 12A extending from both sides thereof in parallel with each other.

A winding shaft 14 is rotatably supported by these leg plates 12 A, and a through hole 16 penetrating in the radial direction of the winding shaft 14 is provided with a webbing (not shown) for restraining an occupant. The ends are locked. Further, one end of a spiral spring 18 is locked to the rear end of the winding shaft 14, and always urges the winding shaft 14 in the webbing winding direction. For this reason, the occupant restraining webbing is usually wound in layers on the winding shaft 14, and after pulling this out, the tongue plate attached to the end of the webbing is engaged with the buckle device attached to the vehicle body. By doing so, it can be put in the mounted state.

A projecting portion 20 is formed at the tip of the winding shaft 14, and a transmitting member 22 is fitted to the projecting portion 20. A projecting portion 24 projects from the center of the transmitting member 22, and a pinion gear 26 is formed at the tip. A pair of recesses 28 are formed in the protrusion 24. Further, a through hole 30 is formed near the base of the projecting portion 24, and when the transmitting member 22 is fitted to the tip of the winding shaft 14, the projecting portion 20 penetrates through the through hole 30 and is further transmitted. It is arranged so as to project from the member 22.

A pair of lock plates 32 is arranged around the protrusion 24. Each of these lock plates 32 has a substantially C-shape with a substantially U-shaped cutout recess 34 formed in the center thereof, and the projection 20 of the winding shaft 14 is accommodated in the cutout recess 34. It can enter and rotate together with the lock wheel 42.

The width dimension of the notch recess 34 is formed to be slightly larger than the width dimension of the protruding portion 20, and the lock plate 32 is rotatable relative to the winding shaft 14 by a predetermined angle.

A claw portion 36 is formed at one end of each of the lock plates 32, and corresponds to the lock tooth 38A of the internal tooth ratchet wheel 38 fixed to the leg plate portion 12A.

Further, a pair of pins 40 are respectively projected on the lock plate 32, and are inserted into the long holes 44 (see FIG. 2) formed in the lock ring 42. The lock wheel 42 is a large-diameter inner tooth ratchet wheel that is pivotally supported by the protruding portion 24, and is rotatable relative to the winding shaft 14. Ratchet teeth 46 are formed on the outer periphery of the lock ring 42. On the outer side of the lock wheel 42, a rotary wheel 48 is pivotally supported integrally with the protrusion 24.

A locking claw 50 is formed in the center of the rotating wheel 48, and the locking claw 50 fits into the recess 28 of the projecting portion 24, so that the rotating wheel 48, together with the projecting part 24, that is, the winding It is designed to rotate integrally with the shaft 14. A spring receiving portion 52 having a U-shaped cross section is formed on the outer periphery of the rotating wheel 48. A torsion coil spring 54 is interposed between the rotary wheel 48 and the lock wheel 42.

The torsion coil spring 54 is supported by a support protrusion 56 formed to project on the lock ring 42, one end of which is in contact with a spring locking pin 58 of the lock ring 42, and the other end of which is projected on the rotary wheel 48. It abuts on the formed spring locking pin 60. The lock wheel 42 is always biased and rotated in the webbing pull-out direction of the winding shaft 14 by the biasing force of the torsion coil spring 54 so as to follow the winding shaft 14.

As a result, when the lock wheel 42 rotates with the winding shaft 14, the lock plate 32 rotates with them, and normally, as shown in FIG. 2, the pin 40 of the lock plate 32 has one end of the long hole 44. On the side, the claw portion 36 of the lock plate 32 is separated from the lock teeth 38A. However, when a rotation delay occurs between the lock ring 42 and the winding shaft 14 that rotates in the webbing pull-out direction against the biasing force of the torsion coil spring 54, the pin 40 of the lock plate 32 becomes a long hole. It guides to the other end side of 44, and thereby the claw portion 36 is engaged with the lock tooth 38A (state of FIG. 3).

Further, as shown in FIG. 1, an inertia member 51 is provided on the surface of the lock wheel 42 that faces the rotating wheel 48. The inertia member 51 is made of metal and has an annular shape, and is integrally formed on the peripheral portion of the lock ring 42. When an acceleration of a predetermined value or more in the webbing pull-out direction acts on the winding shaft 14, an inertial force acts on the lock ring 42, and the lock ring 42 resists the biasing force of the torsion coil spring 54 based on the inertial force. Causes a rotation delay with respect to the winding shaft 14. As a result, in normal times, the webbing can be freely taken up and drawn out, and when the vehicle decelerates suddenly, the webbing is prevented from being drawn out. A sensor holder 62 is fixed to the leg plate portion 12A immediately below the lock wheel 42, and an ELR lever 64, an acceleration sensor 66, and a switching mechanism 68 are respectively assembled.

The ELR lever 64 is substantially L-shaped and is pivotally supported by a support shaft 70 that is formed to project from one end of the sensor holder 62. The tip of the arm 72 is an engaging portion 74 that bends upward and is driven to rotate when the acceleration sensor 66 is actuated to mesh with the ratchet teeth 46 to stop the rotation of the lock wheel 42. .. A release arm 76 is formed on the ELR lever 64, and the engagement between the engagement portion 74 and the ratchet teeth 46 can be released by pressing the release arm 76.

In the acceleration sensor 66, the mounting protrusion 80 of the case 78 is fitted into the receiving portion 82 of the sensor holder 62 to be mounted, and the ball 86 arranged in the conical receiving portion 84 receives the conical receiving portion 84 during acceleration. It is designed to climb up inside.

The actuator 88 pivotally supported by the acceleration sensor 66 has one end mounted on the ball 86, and when pushed up by the ball 86, the other end rotates the ELR lever 64 around the support shaft 70, The engaging portion 74 of the ELR lever 64 meshes with the ratchet teeth 46 of the lock wheel 42.

The switching mechanism 68 includes an engagement lever 130 and a switching lever 132. The engaging lever 130 and the switching lever 132 are formed with circular holes 130A and 132A at their base ends. Further, these circular holes 130A and 132A are arranged coaxially with each other, through which the support shaft 94 formed to project at one end of the sensor holder 62 is inserted, and between the engagement lever 130 and the switching lever 132. A torsion coil spring 134, in which a coil portion is wound around a support shaft 94, is interposed therebetween. The engagement lever 130 and the switching lever 132 are urged in a direction in which they approach each other by the urging force of the torsion coil spring 134, and are separated from each other around the support shaft 94 as a rotation center against the urging force. It is possible to rotate in the direction. The stopper 131 is projected from the engagement lever 130 so that the minimum included angle between the engagement lever 130 and the switching lever 132 is θ (see FIG. 4). By pressing the switching lever 132 in the clockwise direction of FIG. 4 around the support shaft 94, this pressing force is transmitted through the stopper 131 as a rotational force in the clockwise direction of FIG. 6 and the switching lever 132 is pressed in the counterclockwise direction around the support shaft 94 in the counterclockwise direction in FIG. 6, so that this pressing force is supported by the engagement lever 130 via the torsion coil spring 134. It is possible to transmit the rotational force in the counterclockwise direction in FIG. 4 about the shaft 94.

The tip of the engagement lever 130 is a claw portion 136 that is bent in a substantially L shape toward the lock wheel 42, and is capable of engaging with the ratchet teeth 46. As shown in FIG. 1, a hooking pin 138 is provided upright on the cover 118 side of the claw 136, and corresponds to the switching projection 104 of the release gear 102.

A locking projection 96 is formed on the engaging lever 130, and one end of the compression coil spring 98 is locked. Further, the other end of the compression coil spring 98 is housed in a U-shaped spring housing portion 100 formed in the sensor holder 62. Therefore, in the switching mechanism 68, the engaging lever 130 is closer to the engagement position side (the lock wheel 42 side) than the neutral position (the axis of the compression coil spring 98 is linear) by the urging force of the compression coil spring 98. When the lock wheel 42 is in the state of meshing with the ratchet teeth 46 of the lock wheel 42 (FIG. 6), and when the lock wheel 42 is in the non-engagement position side (opposite the lock wheel 42 side) from the neutral position, the lock wheel 42 is in the ratchet position. It constitutes a snap action that is separated from the teeth 46 (FIG. 4).

The release gear 102 is substantially disc-shaped, and a fan-shaped switching projection 104 that projects in the radial direction is formed on a part of the outer circumference. The release gear 102 is rotatably supported by the protrusion 24 of the transmission member 22.

A rib portion 108 is formed so as to project in the axial direction from the peripheral edge of the release gear 102, and the internal teeth 110 formed inside the rib portion 108 mesh with the pinion gear 26 via an intermediate gear 112. .. The intermediate gear 112 is a two-stage gear in which a large-diameter gear portion 114 and a small-diameter gear portion 116 are integrally formed. The intermediate gear 112 is rotatably supported by a cover 118, and the pinion gear 26 meshes with the large-diameter gear portion 114. The small-diameter gear portion 116 meshes with the internal gear 110. Therefore, the release gear 102 decelerates the rotation of the take-up shaft 14 and is transmitted, so that the release gear 102 makes one full rotation between the time when the webbing is fully taken up and the time when the webbing is fully taken out. It rotates in the direction opposite to the direction of rotation of 14.

The release gear 102 rotates about one full turn in the counterclockwise direction as the webbing shown in FIG. When engaged (in the state shown in FIG. 5), the switching lever 132 is turned largely clockwise. The engagement lever 130 is positioned closer to the engagement position side than the neutral position due to the clockwise rotation of the switching lever 132, but the locking pin 138 of the engagement lever 130 and the peripheral surface 104A of the switching projection 104 are formed. The abutment prevents the pawl 136 from engaging the ratchet teeth 46.

When the take-up shaft 14 is taken up from the state of maximum rotation in the webbing take-up direction (arrow B direction in FIG. 5), the release gear 102 moves in the opposite direction (clockwise in FIG. 5). 6) and the switching projection 104 is separated from the locking pin 138 as shown in FIG. 6, the pawl 136 can engage with the ratchet teeth 46.

A friction spring 120 is attached to the spring receiving portion 52 of the rotating wheel 48. The friction spring 120 is a substantially U-shaped leaf spring, and the ALR contact portion 122 and the ELR contact portion 124 are formed by bending. The friction spring 120 has an intermediate portion pressed against the spring receiving portion 52, and when the take-up shaft 14 rotates in the webbing pull-out direction, the ELR abutting portion 124 abuts on the stopper 126 and more. However, when the take-up shaft 14 rotates in the webbing take-up direction, the ELR abutting portion 124 abuts against the releasing arm 76 and presses the engaging portion 74 slightly from the ratchet teeth 46. It is designed to be separated by an amount. Even when the engagement lever 130 is in the engagement state with the ratchet teeth 46, the ALR contact portion 122 contacts the engagement lever 130 by the rotation of the winding shaft 14 in the webbing winding direction. The engagement lever 130 is pushed so as to be separated from the ratchet teeth 46 by a slight amount. In this case, the force by which the ALR contact portion 122 presses the engagement lever 130 is smaller than the biasing force of the compression coil spring 98 because it is transmitted by the friction force of the friction spring 120, and the engagement claw 90 is The engagement lever 130 is not completely disengaged from the ratchet teeth 46, and the engagement lever 130 is merely slightly separated from the ratchet 42 when the webbing is wound to eliminate the winding noise.

Next, the operation of this embodiment will be described. When the occupant pulls the webbing to install the webbing, the lock wheel 42 rotates integrally with the winding shaft 14 without causing a rotation delay with respect to the winding shaft 14. In this case, since the lock plate 32 does not mesh with the lock teeth 38A, the webbing can be easily pulled out (state shown in FIG. 2).

As described above, when the pulled-out webbing is mounted and when the vehicle suddenly decelerates, the acceleration of a predetermined value or more acts in the pulling-out direction of the webbing due to the inertial force of the occupant. As a result, the take-up shaft 14 is rapidly rotated and the lock wheel 42 is delayed in rotation with respect to the take-up shaft 14, and the lock plate 32 moves from the disengaged position separated from the lock teeth 38A to the engaged position. The claw portions 36 of the lock plate 32 and the lock teeth 38A are brought into an engaged state, and rotation of the winding shaft 14 in the webbing pull-out direction is blocked (state in FIG. 3).

Further, when the vehicle rapidly decelerates, the ball 86 pushes up the actuator 88, rotates the ELR lever 64 around the support shaft 70, and the engaging portion 74 meshes with the ratchet teeth 46 (state of FIG. 4). ). This allows the webbing to be pulled out and wound up in the normal state, and prevents the webbing from being pulled out (EL R) when the vehicle is suddenly decelerated.

On the other hand, when the engaging lever 130 is in the engaged state with the lock wheel 42, the ALR is set (the state shown in FIG. 6). In the ALR, since the claw portion 136 of the engagement lever 130 meshes with the ratchet teeth 46 of the lock wheel 42, the rotation of the lock wheel 42 in the webbing pull-out direction is blocked. Therefore, as the webbing is pulled out, the lock wheel 42 is delayed in rotation with respect to the take-up shaft 14, the pawl portion 36 of the lock plate 32 and the lock tooth 38A are brought into engagement with each other, and the webbing of the take-up shaft 14 is made. Rotation in the pull-out direction is prevented. This prevents the webbing from being pulled out and allows only winding (ALR) regardless of normal or sudden vehicle deceleration.

Now, when switching the lock mechanism of the winding shaft 14 from ELR to ALR, the webbing may be pulled out beyond the normal mounting range to the vicinity of all the drawers. That is, when the webbing is pulled out, the release gear 102, which rotates following the take-up shaft 14, rotates in the direction opposite to the take-up shaft 14, and when the amount of the webbing pulled out becomes substantially the maximum amount, the switching protrusion is provided. 104 is engaged with the switching lever 132 (state of FIG. 5) and pushes the switching lever 132 clockwise in FIG. This pressing force is transmitted to the engagement lever 130 via the torsion coil spring 134, and the engagement lever 130 moves to the engagement position side beyond the neutral position against the biasing force of the compression coil spring 98. To do. In this state, the engaging lever 130 is urged by the compression coil spring 98 so that the claw 136 engages with the ratchet teeth 46. However, in the present embodiment, the switching projection 104 is located on the rotational movement locus of the locking pin 138 of the pawl 136, and the locking pin 138 contacts the peripheral surface 104A of the switching projection 104. Therefore, the claw 136 does not engage with the ratchet teeth 46. That is, the lock wheel 42 is freely rotatable in the webbing withdrawing direction, and is rotatable with the lock plate 32 in the webbing withdrawing direction. In this case, when the webbing is pulled out, the rotation of the lock wheel 42 is delayed by the inertial member 51 and the lock plate 32 does not engage with the lock tooth 38A at the correct position, and even if the lock wheel tries to mesh with the next lock tooth, Even if a force in a direction different from the guide direction of the pin 40 of the lock plate 32 by the elongated hole 44 acts on 42, the lock wheel 42 is not engaged with the engagement lever 130, so that the lock wheel 42 is , And can rotate together with the lock plate 32 in the webbing pull-out direction. Therefore, the guide long hole 44 direction of the lock wheel 42 coincides with the moving direction of the lock plate 32, and the load is prevented from acting on each member constituting the webbing retractor.

Further, there is an error in the maximum withdrawal position of the webbing, and even if the switching protrusion 104 further rotates counterclockwise in the drawing, the switching lever 132 separates from the engagement lever 130 (clockwise in FIG. 5). Direction), the force acting on the switching lever 132 is absorbed by the torsion coil spring 134, and no load acts on the switching lever 132.

When the webbing is wound from the engagement preventing state of the engagement lever 130 and the lock wheel 42 (the state of FIG. 5), the release lever 102 rotates in the clockwise direction of FIG. 5, and the switching projection 104 is formed. The engagement between the locking pin 138 and the locking pin 138 is released, and the engagement lever 130 is rotationally moved in the clockwise direction in FIG. 5 around the support shaft 94 by the urging force of the compression coil spring 98, so that the pawl portion 136 moves the ratchet teeth. It engages with 42 and is set as ALR (state of FIG. 6).

When switching the lock mechanism of the winding shaft 14 from ALR to ELR, the webbing may be entirely wound up. That is, as the webbing is wound, the release gear 102 rotates in the clockwise direction (arrow B direction) in FIG. 6, and the switching projection 104 pushes the switching lever 132 in the counterclockwise direction in FIG. This pressing force is transmitted to the engagement lever 130 via the stopper 131 as a rotational force in the counterclockwise direction in FIG. 6 about the support shaft 94, and the engagement lever 130 passes the neutral position and is disengaged. Moved to a position. As a result, the engagement lever 130 is maintained in the ELR state in which the ratchet teeth 46 are separated from the engagement lever 130 by the biasing force of the compression coil spring 134 (state of FIG. 7).

Next, a second embodiment will be described with reference to FIGS. In the present embodiment, in the switching mechanism 68A, the engagement lever 130B and the switching lever 132B are integrally formed in a substantially V shape. The tip of the engaging lever 130B extends toward the outer peripheral surface of the lock wheel 42, and the tip of the switching lever 132B extends toward the outer peripheral surface of the small diameter protrusion 166 of the switching protrusion 104B of the release gear 102A. There is. The base ends of the engaging lever 130B and the switching lever 132B are pivotally supported by the support shaft 94, whereby both the engaging lever 130B and the switching lever 132B can rotate around the support shaft 94. ing.

The switching lever 132B is provided with a torsion coil spring 134C. The coil portion of the torsion coil spring 134C is fitted to the coil support shaft 160 formed to project in parallel with the support shaft 94 at the tip of the switching lever 132B, and the end of the one end portion 134A is bent so that the switching lever 132B is bent. The U-shaped portion 168 formed in the middle portion between the front end portion and the base end portion of 132 is locked and fixed, and the other end portion 134B is raised upward and extends freely. It corresponds to the large diameter protrusion 164 of the switching protrusion 104B of the release gear 102A. According to the torsion coil spring 134C, the other end portion 134B is pressed and rotated about the coil support shaft 160 with respect to the one end portion 134A of the torsion coil spring 134C and elastically deformable. , It is always biased to its original position.

A locking pin 138 A is provided at the tip of the switching lever 132 B in parallel with the support shaft 94 and below the support shaft 94. The locking pin 138 A is provided on the release gear 102. Corresponds to the outer peripheral surface of the large diameter protrusion 164 of the switching protrusion 104A.

Further, the switching projection 104A is integrally configured in a stepped manner with a large-diameter projection 164 and a small-diameter projection 166 having a small diameter on the surface facing the rotating wheel 48.

According to the switching projection 104A, as the take-up shaft 14 rotates in the webbing pull-out direction (arrow B direction), the reduction gear 102 rotates in the opposite direction (arrow A direction), and the webbing moves. However, when a predetermined amount, for example, substantially the entire amount is pulled out, one end 105 in the rotation direction of the large diameter protrusion 164 comes into contact with the other end 134B of the torsion coil spring 134C from one direction side of the switching lever 132C and the coil spring. Press the other end of 134C. This pressing force is transmitted to the one end portion 134A of the torsion coil spring 134C, and the switching lever 132B is pressed together with the engaging lever 130B around the support shaft 94 (in the direction of arrow C) (FIG. 10). The engaging lever 130B moves to the engaging position side from its neutral position.

At this time, as shown in FIG. 10, the outer peripheral surface of the large diameter protrusion 164 is on the movement locus of the locking pin 138A of the engaging lever 130B, and the outer peripheral surface thereof contacts the locking pin 138A. Then, the rotational movement of the engagement lever 130B, which is biased to the engagement position by the biasing force of the compression coil spring 98, to the engagement position is restrained, and the pawl portion 136 and the ratchet teeth 46 of the engagement lever 130B are restrained. Are prevented from engaging. From this state, as the webbing starts to be wound and the release gear 102A rotates in the reverse direction (in the direction of arrow B), the outer peripheral surface of the large diameter protrusion 164 moves on the locus of the engagement pin 138A of the engagement lever 130B. The engagement between the pawl portion 136 of the engagement lever 130B and the ratchet teeth 46 is continued until the outer peripheral surface of the large diameter protrusion 164 prevents the movement of the engagement lever 130B from moving to the engagement position. Maintained. In this way, the large-diameter protrusion 164 constitutes blocking means on the outer peripheral surface thereof. Then, when the contact of the locking pin 138 with the outer peripheral surface of the large diameter protrusion 164 is released, the claw portion 136 of the engaging lever 130B and the ratchet tooth 46 can be engaged (FIG. 11).

On the other hand, as the take-up shaft 14 rotates in the webbing take-up direction (arrow A direction), the release gear 102A rotates in the opposite direction (arrow B direction), and the webbing takes up substantially the entire amount. Then, the rotation direction one end 107 of the small diameter protrusion 166 located on the opposite side to the rotation direction one end 105 of the large diameter protrusion 164 is connected to the tip end of the switching lever 132B and the other direction side opposite to the one direction side. To abut (FIG. 12). As a result, the switching lever 132B is pressed around the support shaft 94 (in the direction of arrow D), and the engagement lever 130B moves to the non-engagement position side from the neutral position.

Next, the operation of the second embodiment will be described. When switching from ELR to ALR, the webbing may be pulled out substantially entirely. That is, when the webbing is pulled out substantially completely, one end 105 in the rotational direction of the large-diameter protrusion 164 of the release gear 102A engages with the other end 134B of the torsion coil spring 134C (FIG. 10) to switch. The lever 132B is pressed in the direction of arrow C. This pressing force is transmitted from the other end portion 134B of the torsion coil spring 134C to the one end portion 134A, and then to the switching lever 132B and the engagement lever 130B. As a result, the engagement lever 130C moves to the engagement position side beyond the neutral position against the biasing force of the compression coil spring 98. In this state, the engagement lever 130B is urged to move to the engagement position by the compression coil spring 98. At this time, the outer peripheral surface of the large diameter protrusion 164 is positioned on the movement locus of the locking pin 138 of the claw portion 136 of the engagement lever 130B, and the engagement lever 130B is contacted by the outer peripheral surface of the large diameter protrusion 164. Since the contact is restricted, the pawl 136 does not engage with the ratchet teeth 46 of the lock wheel 42 (Fig. 10).

When the webbing is wound from the state (FIG. 10) in which the claw portion 136 of the engagement lever 130B and the ratchet teeth 46 of the lock ring 42 are prevented from engaging with each other, the outer peripheral surface of the large diameter protrusion 164 is engaged with the engagement lever 130B. The engaging pin 138A is disengaged and separated from the engaging pin 138A, and the claw portion 136 engages with the ratchet tooth 42 to be ALR (FIG. 11).

When switching from ELR to ALR, a large pressing force acts on the other end portion 134B of the torsion coil spring 134C via the one end portion 105 in the rotation direction of the large diameter protrusion 164 as the webbing is pulled out. However, the pressing force is transmitted to the switching lever 132B along with the elastic deformation of the torsion coil spring 134C, the force acting on the engaging lever 130B is buffered, and a large load acts on each member. There is nothing to do. Further, even after the engagement lever 130B is restricted by the outer peripheral surface of the large-diameter protrusion 164, the release gear 102A can continue to rotate in the webbing drawing-out direction by the elastic deformation of the torsion coil spring 134C. Therefore, the movement error of the release gear 102A is absorbed.

This engagement state is maintained until substantially the entire amount of webbing is wound, as will be described later.

Here, similarly to the first embodiment, when the webbing is pulled out for switching from ELR to ALR, the lock wheel 42 is delayed in rotation by the inertia member 51, and the claw portion 36 of the lock plate 32 is locked by the lock teeth. In some cases, it may mesh with 38A. In this case, the relative rotation between the lock wheel 42 and the inertia member 51 is performed, while the engagement lever 130B moves to the engagement position side. When the pawl portion 36 of the lock plate 32 meshes with the lock tooth 38A and tries to mesh with the next lock tooth, the lock ring 42 is guided by the elongated hole 44 in the guiding direction of the pin 40 of the lock plate 32. The force of a different direction acts on the guide direction of the lock plate 32 by the long hole 44, and the engagement direction in which the claw portion 36 of the lock plate 32 and the lock tooth 38A of the internal tooth ratchet wheel 38 should properly engage. As a result, the locking wheel 42 is subjected to a rotational force in the wetting direction. Even if this rotational force is exerted, the engagement lever 130B moves to the engagement position side, but the engagement between the claw portion 136 of the engagement lever 130B and the ratchet teeth 46 of the lock wheel 42 is blocked and the lock wheel 130B is blocked. Since the rotation of the lock wheel 42 is free, there is no counter force against the rotational force of the locking wheel 42 in the webbing pull-out direction, and the lock wheel 42 can smoothly rotate in the webbing pull-out direction.

Therefore, in the case of switching from ELR to ALR, even when the locking means is operated and meshes with the next lock tooth, no load is applied to each constituent part. It is achieved with a simple structure without increasing accuracy.

On the other hand, when switching from ALR to ELR, the webbing may be wound up in its entirety. That is, as the take-up shaft 14 rotates in the webbing pull-out direction, the release gear 102A rotates, and when the webbing is in a state in which substantially all the webbing is taken up, the other end portion in the rotational direction of the small diameter protrusion 166 of the release gear 102A. 107 contacts the tip of the switching lever 132B, and the switching lever 132B is pressed in the direction of arrow D. Then, the engagement lever 130B is moved from the neutral position to the non-engagement position side. As a result, the engagement lever 130B is maintained in the non-engagement position by the urging force of the compression coil spring 98 (FIG. 12), and the ELR becomes possible.

When switching from ALR to ELR, the other end 107 in the rotational direction of the small diameter protrusion 166 of the release gear 102A comes into contact with the tip of the switching lever 132B so that the engagement lever 130B is disengaged from the neutral position. Although it is arranged to move to the mating position side, the other end of the large diameter protrusion 164 in the rotational direction may contact the other end of the torsion coil spring 134C instead of the small diameter protrusion 166. is there.

In addition, at the time of ALR, the webbing is pulled out by a certain amount, and the rotation delay occurs in the lock wheel 42. However, the engagement prevention between the claw portion 136 and the ratchet teeth 42 is released, and thus the ALR is released. Immediately after the switching, the one end of the large diameter protrusion 164 of the release gear 102A is near the locking pin 138 of the pawl 136, so that the webbing is pulled out and the reduction gear 102 rotates accordingly. Also, one end of the large-diameter protrusion 164 of the release gear 102 comes into contact with the locking pin 138 of the claw 136, and thereafter the release gear 102A cannot rotate, so that the webbing cannot be pulled out. , The locking means may not work. However, such a situation occurs when the webbing is pulled out by almost the maximum amount, and in normal wearing, the webbing is pulled out by the maximum amount so that the webbing is not used when the webbing is pulled out by the maximum amount. The above situation can be avoided by increasing the amount.

Other constitutions and effects are the same as those of the first embodiment.

[0067]

[Effect of the device]

 According to the present invention, the rotary lock member such as a lock plate is a fixed lock member such as an internal tooth ratchet wheel when switching from ELR to ALR without increasing the accuracy of components. This has the excellent effect that it is possible to obtain a webbing retractor that does not apply a load to each component even if it tries to mesh with the next lock tooth when meshing with.

[Brief description of drawings]

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

FIG. 2 is a front view showing the correspondence relationship between the lock plate and the internal tooth ratchet wheel of the webbing retractor according to the first embodiment.

3 is an operation diagram of FIG. 2. FIG.

FIG. 4 is a front view showing the operation of the lock mechanism portion of the webbing retractor according to the first embodiment.

5 is an operation diagram of FIG. 4. FIG.

6 is an operational view of FIG. 4. FIG.

FIG. 7 is an operation diagram of FIG. 4.

FIG. 8 is an exploded perspective view of a webbing retractor according to a second embodiment of the present invention.

FIG. 9 is an ELR of the webbing retractor according to the second embodiment.
It is a front view which shows and ALR.

FIG. 10 is a diagram showing switching from ELR to ALR in FIG. 9;

[Fig. 11] Fig. 1 is a diagram showing the process of switching from ELR to ALR.
It is a figure which shows the operation state next to 0.

FIG. 12 is a diagram showing switching from ALR to ELR in FIG. 9;

[Explanation of symbols]

 14 Winding Shaft 32 Lock Plate (Locking Means) 38 Internal Tooth Ratchet Wheel (Locking Means) 42 Lock Wheel (Relative Rotating Member) 104 Switching Protrusion (Blocking Means) 104B Switching Protruding Means (Blocking Means) 130 Engaging Lever 130B Engagement lever 132 Switching lever (switching means) 132B Switching lever (switching means)

Claims (1)

[Scope of utility model registration request] 1. A take-up shaft for taking up a webbing, a relative rotating member which rotates following the take-up shaft and causes a rotation delay due to a sudden webbing pull-out, and the take-up shaft due to a rotation delay of the relative rotating member. Locking means for preventing the webbing from being pulled out, a separated position separated from the relative rotation member, and an engagement position that engages with the relative rotation member and causes the rotation delay in the relative rotation member, and moves the neutral position to the neutral position. An engaging lever that is urged in the separating position direction and the engaging position direction when it passes, and a switching unit that moves the engaging lever in the engaging position direction by pulling out a predetermined value or more of the web vigng, When the webbing is pulled out by a predetermined value or more, it comes into contact with an engagement lever that is moved in the engagement position direction to prevent the engagement lever from engaging with the relative rotation member, The webbing retractor and having a blocking means to allow engagement of the said relative rotary members of said engagement lever and away Riniyori the engagement lever, the.