JP2012192854A - Seat belt retractor and seat belt device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress noise from being generated due to rattling of an inertial body of a vehicle sensor in a regular state.SOLUTION: The vehicle sensor 8 includes an inertial ball 8d. The inertial ball 8d is set in a non-operating position for allowing a spool to rotate in the direction of withdrawing a seat belt in the regular state and moves between the non-operating position and an operating position for suppressing the spool from rotating in the direction of withdrawing the seat belt upon sensing the deceleration generated in an emergency which is equal to or more than a predetermined value. Further, the vehicle sensor 8 locks the inertial ball 8d in the non-operating position in the regular state so as to suppress the rattling of the inertial ball, and includes a solenoid coil 8e capable of moving the inertial ball 8d to the operating position in an emergency. The solenoid coil 8e is energized in the regular state, and the inertial ball 8d is held in a case 8a so that the rattling of the inertial ball 8d is suppressed, and the noise is prevented from being generated.

Description

  In the present invention, in a vehicle such as an automobile, the inertia of the vehicle sensor is activated by the deceleration in the event of a large deceleration in the vehicle such as a vehicle collision, thereby locking the rotation of the spool in the seat belt pull-out direction. The present invention relates to a technical field of a seat belt retractor and a seat belt apparatus.

  2. Description of the Related Art Conventionally, a seat belt device that is installed in a vehicle such as an automobile restrains an occupant with a seat belt in an emergency in which a large deceleration of a predetermined value or more occurs in a vehicle such as a vehicle collision. This seat belt device is provided with a seat belt retractor that winds and pulls out the seat belt by a spool and prevents the seat belt from being pulled out in an emergency.

  As a conventional seat belt retractor, there is known a seat belt retractor in which an inertia body such as an inertia ball of a vehicle sensor is operated by a deceleration generated in a vehicle in an emergency so that rotation of a spool in a seat belt pull-out direction is locked. (For example, refer to Patent Document 1).

7 is a longitudinal sectional view of the seat belt retractor described in Patent Document 1, and FIG. 8 is a left side view of FIG. In the figure, 101 is a seat belt retractor, 102 is a U-shaped frame, 102a is a left side wall, 102b is a right side wall, 102c and 102d are teeth, 103 is a spool,
104 is a seat belt, 105 is a lock gear, 105a is an external tooth, 105b and 105c are cam holes, 106 is a main pawl, 107 is a backup pawl, 108 is a joint pin, 109 is an inertial body (webbing sensor), 109a is a locking claw , 110 is a cover, 110a is an internal tooth, 111 is a deceleration sensing means (vehicle sensor), 111a is an inertia ball, 111b is a lever, 111c is a locking claw, and 112 is a biasing force applying means.

When a large deceleration greater than a predetermined value occurs in the vehicle, the inertia ball 111a of the vehicle sensor 111 moves and the lever 111b rotates to the position of the two-dot chain line. Then, the engaging claw 111c of the lever 111b becomes an operating position where it can engage with the external tooth 105a of the lock gear 105. On the other hand, because the seat belt 104 is pulled out by the inertial movement of the occupant due to the large deceleration, the spool 103 and the lock gear 105 rotate in the seat belt pull-out direction α. For this reason, the external teeth 105a engage with the locking claws 111c of the lever 111b. Then, the lock gear 105 stops and only the spool 103 rotates. As a result, the main pawl 106 moves while being guided by the cam hole 105b and meshes with the teeth 102c of the left side wall 102a, and the joint pin 108 is guided and rotated by the cam hole 105c. It meshes with the teeth 102d of the wall 102b. As a result, the rotation of the spool 103 in the seat belt withdrawing direction is locked, and the seat belt 104 is prevented from being withdrawn.

  In the seatbelt retractor described in Patent Document 1, when the seatbelt 104 is suddenly pulled out from the pullout of the seatbelt 104 for attaching a normal seatbelt, the inertial body 109 that is a webbing sensor operates. The rotation of the spool 103 in the seat belt withdrawing direction is locked, and the withdrawal of the seat belt 104 is prevented.

The first locking means having a solenoid and the second locking means having an inertia ball and a solenoid for restricting the operation of the inertia ball are provided, and the first locking means rotates the spool in the seat belt withdrawing direction in the case of an emergency. In addition to locking, the operation of the inertial ball of the second locking means is regulated by a solenoid, and when the first locking means becomes inoperable, the inertial ball of the second locking means is made operable so that the spool is A seat belt retractor that locks the rotation in the seat belt pull-out direction has been proposed (see, for example, Patent Document 2). In the seat belt retractor described in Patent Document 2, the movement of the inertia ball of the second lock means is locked by a solenoid when the first lock means operates normally, and the first lock means is operated when the first lock means does not operate normally. (2) Allow the movement of the inertia ball of the locking means.

  Furthermore, when the child seat is fixed to the vehicle seat with a seat belt, the child seat is fixed by locking the rotation of the seat belt retractor spool in the seat belt pull-out direction by pushing up the inertial ball of the vehicle sensor with the electromagnetic force of the solenoid. A seat belt retractor that prevents the seat belt from slackening has been proposed (see, for example, Patent Document 3).

Japanese Patent No. 3192198. Japanese Patent Laid-Open No. 2002-220028. Japanese Patent No. 4414029.

  By the way, in the conventional seat belt retractor using the inertia ball 111a such as the seat belt retractor described in Patent Document 1, the inertia ball 111a swings (rattles) during normal traveling of the vehicle other than in an emergency. There is a case. When the inertia ball 111a swings in this way, a sound may be generated. Although this sound does not affect the function of the seat belt retractor, it is desirable to suppress it if possible to obtain the comfort of the passenger in the vehicle interior.

  Further, in the seat belt retractor described in Patent Document 2, when the first lock means is inoperable and no large deceleration occurs in the vehicle, the inertia ball of the second lock means may rattle and generate a sound. is there. That is, in the seat belt retractor described in Patent Document 2, no consideration is given to prevention of rattling of the inertia ball. In other words, Patent Document 2 does not disclose or suggest the technical idea of preventing the generation of abnormal noise due to rattling of the inertia ball at normal times.

  Furthermore, in the seat belt retractor described in Patent Document 3, not only the inertia ball is not regulated by the solenoid during normal operation, but also the inertia ball is not attracted by the solenoid. Therefore, Patent Document 3 does not disclose or suggest the technical idea of preventing the generation of abnormal noise due to the rattling of the inertia ball at normal times.

  The present invention has been made in view of such circumstances, and an object of the present invention is to effectively suppress the sound generated by the swing (rattle) of the inertial body of the vehicle sensor at normal times. To provide a seat belt retractor and a seat belt device including the same.

In order to solve the above-described problems, a seat belt retractor according to the present invention is set to a spool for winding up a seat belt and a non-operating position that normally allows rotation of the spool in the seat belt pull-out direction. A seat belt retractor comprising at least a vehicle sensor having at least an inertial body that moves between an operating position that senses a deceleration greater than or equal to a predetermined speed that occurs in an emergency and locks the rotation of the spool in the seat belt withdrawing direction. The vehicle sensor further includes an inertial body that fixes the inertial body in the non-operating position in a normal state to suppress rattling of the inertial body and allows the inertial body to move to the operating position in an emergency. It is characterized by having a sticking suppression holding member.

  Further, in the seat belt retractor according to the present invention, the inertia body rattling suppression holding member is fixed in the non-operating position by energizing the inertial body and sucking the inertial body, and de-energized in an emergency. It is a solenoid that enables the inertial body to move to the operating position.

Furthermore, the seat belt retractor according to the present invention includes a control unit that controls energization of the solenoid.
Further, the seat belt retractor according to the present invention is characterized in that it includes a second solenoid that is energized when it is necessary to forcibly lock it to move the inertial body to the operating position.

  Further, in the seat belt retractor according to the present invention, the inertial body rattling suppression holding member fixes and supports the inertial body in the non-operating position in a normal state and can move the inertial body to the operating position in an emergency. The inertial body is a rattling suppression holding part, and the inertial body rattling suppression holding part is provided in a case in which the inertial body is accommodated, and the inertial body is energized by suctioning the inertial body when energized in an emergency. A solenoid for moving the body to the operating position is provided.

  On the other hand, a seat belt device according to the present invention includes a seat belt that restrains an occupant in an emergency, a seat belt retractor that winds up the seat belt so that the seat belt can be pulled out, a tongue that is slidably supported by the seat belt, In the seat belt apparatus including at least a buckle on which the tongue is detachably locked, the seat belt retractor is any one of the seat belt retractors of the present invention described above.

  According to the seat belt retractor of the present invention configured as described above, the inertial body of the vehicle sensor is prevented from rattling when the inertial body of the vehicle sensor is normal, that is, when the operation of the vehicle sensor is not required. In addition, the inertial body can be moved to an operating position that locks the rotation of the spool in the seat belt withdrawing direction in an emergency. As a result, the rattling of the inertial body can be suppressed during normal times, that is, when the vehicle sensor is not required to operate. As a result, it is possible to effectively suppress the generation of sound due to rattling of the inertial body when the vehicle sensor is not required to operate. Further, in the event of an emergency, the inertial body rattling suppression holding member enables the inertial body to move to the operating position, so that the rotation of the spool in the seat belt withdrawing direction can be locked as in the case of the conventional vehicle sensor.

In particular, when the inertia body shake suppression holding member is configured by a solenoid, it is possible to easily perform control for suppressing the rattling of the inertia body. In that case, the inertial body rattling suppression holding member can move the inertial body to the operating position in an emergency, and even if the solenoid is not energized for some reason, the seatbelt retractor seatbelt The drawer lock function can be exhibited stably. Thereby, the locking reliability of the seat belt retractor can be ensured.
In addition, by controlling the energization to the solenoid by the control unit, it is possible to set various conditions for determining the operation unnecessary state of the vehicle sensor.

Further, in a state where it is necessary to forcibly lock, the inertial body is set and held at the operating position by the electromagnetic attraction force of the second solenoid, so that the forcible locking operation can be performed stably. . As a result, the set tension of the seat belt can be maintained in a state where the forced locking operation is necessary.

  Furthermore, the inertial body is configured to be a rattling suppression holding member by forming the inertial body provided in the case that accommodates the inertial body with the rattling suppression holding part, thereby forming the rattling suppression holding member more easily. And the number of parts can be reduced.

  On the other hand, according to the seat belt device of the present invention, since the seat belt retractor that can effectively suppress the sound generated by rattling of the inertia ball at normal time is provided, the vehicle interior is quietly kept during normal driving of the vehicle. Can be. As a result, the passenger can spend comfortably in the passenger compartment.

It is a figure showing typically a seat belt device provided with the 1st example of an embodiment of a seat belt retractor concerning the present invention. It is a front view which shows typically the vehicle sensor used for the seatbelt retractor of a 1st example. It is a front view which shows typically the vehicle sensor used for the 2nd example of embodiment of the seatbelt retractor concerning this invention. It is a front view which shows typically the vehicle sensor used for the 3rd example of embodiment of the seatbelt retractor concerning this invention. The inertia ball of the vehicle sensor of the third example is schematically shown with a rattling suppression holding portion, (a) is a plan view, (b) is a cross-sectional view taken along line VB-VB in (a), and (c) is inertia. It is sectional drawing which shows the state which supported the ball | bowl. The inertia ball of 3rd example shows the modification of the rattling suppression holding part typically, (a) is a top view, (b) is a sectional view which meets the VIB-VIB line in (a), (c) is inertia. It is sectional drawing which shows the state which supported the ball | bowl. 2 is a longitudinal sectional view of a seat belt retractor described in Patent Document 1. FIG. It is a left view of the seatbelt retractor described in Patent Document 1.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a view schematically showing a seat belt apparatus including a first example of an embodiment of a seat belt retractor according to the present invention.

As shown in FIG. 1, the seat belt device 1 of the first example is basically the same as a conventionally known three-point seat belt device. In the figure, 1 is a seat belt device, 2 is a vehicle seat, 3 is a seat belt retractor disposed in the vicinity of the vehicle seat 2, 4 is retractably wound around the seat belt retractor 3, and a belt anchor 4 a at the front end is retracted. A seat belt fixed to the floor of the vehicle body or the vehicle seat 2, 5 is a guide anchor that guides the seat belt 4 pulled out from the seat belt retractor 3 toward the occupant's shoulder, and 6 is guided from this guide anchor 5. A tongue 7 slidably supported by the seat belt 4 is a buckle that is fixed to the floor of the vehicle body or the vehicle seat and that the tongue 6 is detachably inserted and locked.
The seatbelt 4 mounting operation and mounting release operation in the seatbelt apparatus 1 are the same as those of a conventionally known seatbelt apparatus.

  The seat belt retractor 3 of the first example is the same as the seat belt retractor described in Patent Document 1, except for the deceleration sensing means (vehicle sensor) and the other operations. Therefore, the other configurations and other operations of the seat belt retractor 3 of the first example can be normally understood with reference to Patent Document 1, and thus the description thereof is omitted.

FIG. 2 is a front view schematically showing a vehicle sensor used in the seat belt retractor of the first example.
As shown in FIG. 2, the vehicle sensor 8 (corresponding to the conventional vehicle sensor 111 shown in FIG. 7) of the seat belt retractor 3 of the first example includes a case 8a and a lever 8b that is rotatably supported by the case 8a. And an engaging claw 8c provided at the tip of the lever 8b, and an inertia ball 8d, which is an inertial body made of a magnetic material, movably disposed in the case 8a. In the normal state, the lever 8b and the inertia ball 8 are in the non-actuated position indicated by the solid line, and when the vehicle is decelerated more than a predetermined value in an emergency, the inertia ball 8d moves to the actuated position indicated by the two-dot chain line. Thus, the lever 8b in the non-operating position indicated by the solid line becomes the operating position indicated by the two-dot chain line. In the inoperative position of the lever 8b and the inertia ball 8, rotation of the spool in the seat belt pull-out direction is allowed. Further, when the lever 8b is in the operating position, the engaging claw 8c can be engaged with external teeth (corresponding to the external gear 105a shown in FIG. 7) of a lock gear (corresponding to the lock gear 105 shown in FIG. 7) (not shown). Become. Therefore, in the operation position of the lever 8b and the inertia ball 8, the rotation of the spool in the seat belt withdrawing direction is locked.

  The vehicle sensor 8 has a solenoid coil 8e. The solenoid coil 8e is disposed in the case 8a so as to face the inertia ball 8d in the non-actuated position. The solenoid coil 8e is energized to generate an electromagnetic force and hold the inertia ball 8d in a non-operating position so as not to rattle (do not swing). The solenoid coil 8e is electrically connected to the controller 9, and the controller 9 is electrically connected to the vehicle battery 10. Further, the controller 9 is electrically connected to an operation unnecessary state detector 11 of the vehicle sensor 8. The operation unnecessary state detector 11 of the vehicle sensor 8 detects a state in which sensing by the vehicle sensor 8 is unnecessary, that is, an operation unnecessary state of the vehicle sensor 8. The operation unnecessary state of the vehicle sensor 8 is a normal state except for an emergency of the vehicle. The controller 9 controls energization to the solenoid coil 8 e based on a detection signal from the operation unnecessary state detection unit 11 of the vehicle sensor 8. That is, the controller 9 energizes the solenoid coil 8e when it is determined that the vehicle sensor 8 is in an operation unnecessary state based on a detection signal from the operation unnecessary state detection unit 11 of the vehicle sensor 8.

  Examples of the operation unnecessary state detection unit 11 of the vehicle sensor 8 include a conventionally known buckle switch that detects engagement between the tongue 6 and the buckle 7, and an occupant seating detection sensor that detects the seating state of the occupant on the vehicle seat 2 (or , Seat weight detection sensor), vehicle speed sensor, and the like. The buckle switch detects a state in which the operation of the vehicle sensor 8 is unnecessary by detecting a non-engagement state between the tongue 6 and the buckle 7. The occupant seating detection sensor (or seat weight detection sensor) detects a state in which the operation of the vehicle sensor 8 is unnecessary by detecting a state in which no occupant is seated on the vehicle seat 2. Further, the vehicle speed sensor detects a state in which the inertia ball 8e is likely to rattle, such as a state where the vehicle has stopped from running and deceleration has occurred, an idling state where the vehicle has stopped, or a state where the vehicle is running at a slow speed. Thus, a state where the operation of the vehicle sensor 8 is unnecessary is detected.

  In the vehicle sensor 8 of the seat belt retractor 3 of the first example configured as described above, the controller 9 is based on a detection signal from the operation unnecessary state detection unit 11 of the vehicle sensor 8 with the engine switch turned on. When it is determined that the vehicle sensor 8 is in an operation unnecessary state, the solenoid coil 8e is energized. Then, the solenoid coil 8e generates an electromagnetic force to attract the inertia ball 8d and press-contact with the case 8a. Thus, the inertia ball 8d is held in the non-actuated position and does not rattle.

Further, when the controller 9 determines that the vehicle sensor 8 is in an operation required state based on the detection signal from the operation unnecessary state detection unit 11 of the vehicle sensor 8, the energization to the solenoid coil 8e is stopped. Then, the solenoid coil 8e does not generate an electromagnetic force and does not attract the inertia ball 8d. As a result, the inertial ball 8d can move from the non-operating position to the operating position in an emergency. Accordingly, the vehicle sensor 8 is activated in an emergency, the seat belt retractor 3 locks the withdrawal of the seat belt 4, and the seat belt 4 firmly restrains the occupant.

  Furthermore, even if the solenoid coil 8e is not energized for some reason when the vehicle sensor 8 is not required to operate, the inertial ball 8d is not attracted by the solenoid coil 8e. The lock function of the withdrawal of the seat belt 4 of the retractor 3 is exhibited. Therefore, even if the solenoid coil 8e is not energized, the locking reliability of the seat belt retractor 3 is ensured.

  According to the seat belt retractor 3 of the first example, when the vehicle sensor 8 is not required to operate, the inertia ball 8d is attracted by the electromagnetic force of the solenoid coil 8e and held in the non-operating position. The inertia ball 8d can be prevented from rattling. Thereby, when the vehicle sensor 8 is not required to be operated, it is possible to effectively suppress the generation of sound due to the rattling of the inertia ball 8d.

  In particular, since the member that suppresses the rattling of the inertial ball 8d is configured by the solenoid coil 8e, it is possible to easily control the rattling of the inertial ball 8d. In this case, when the operation of the vehicle sensor 8 is necessary, the electromagnetic force of the solenoid coil 8e that attracts the inertia ball 8d has disappeared, so that the inertia ball 8d can be moved to the operation position in an emergency. . Thereby, the lock function of the drawer of the seat belt 4 of the seat belt retractor 3 can be exhibited in an emergency. In addition, even if the solenoid coil 8e is not energized for some reason, the lock function of the seat belt retractor 3 of the seat belt retractor 3 can be stably exhibited in an emergency, and the lock reliability of the seat belt retractor 3 can be achieved. Sex can be secured. Further, by controlling the energization of the solenoid coil 8e by the controller 9, various conditions for determining the operation unnecessary state of the vehicle sensor 8 can be set.

In order to further increase the electromagnetic attractive force of the inertia ball 8d by the solenoid coil 8e, an iron core 8f can be provided as shown by a dotted line in FIG.
Other configurations, other operations, and other effects of the vehicle sensor 8 of the first example and the seat belt retractor 3 of the first example are the same as those of the vehicle sensor and the seat belt retractor described in Patent Document 1. .

  On the other hand, according to the seat belt device 1 of the first example provided with the seat belt retractor 3 of the first example, the sound generated by rattling of the inertia ball 8e at the normal time when the vehicle sensor 8 is not required is effectively suppressed. Therefore, the interior of the vehicle can be kept quiet during normal driving of the vehicle. As a result, the passenger can spend comfortably in the passenger compartment.

FIG. 3 is a front view schematically showing a vehicle sensor used in the second example of the embodiment of the seat belt retractor according to the present invention.
As shown in FIG. 3, the vehicle sensor 8 of the second example further includes a second solenoid coil 8g in addition to the vehicle sensor 8 of the first example. The second solenoid coil 8g is also electrically connected to the controller 9. When the second solenoid coil 8g is energized, the inertia ball 8d is attracted to the operating position even when the inertia ball 8d is being held by the solenoid coil 8e, and the seat belt retractor 3 is forcibly forced. Next, the drawer belt lock state of the seat belt 4 is set. That is, the second solenoid coil 8g constitutes an interlock mechanism.

  Further, the controller 9 is electrically connected with an interlock necessary state detection unit 12. The interlock necessary state detection unit 12 detects a state in which the interlock operation is necessary in order to maintain the tension when the seat belt 4 is pulled out and locked, that is, a state in which the forced lock operation is necessary. Is output. The controller 9 controls energization to the second solenoid coil 8g based on the detection signal from the interlock necessary state detection unit 12. When the controller 9 determines that the interlock is in an operation required state based on the detection signal from the interlock required state detection unit 12, the controller 9 energizes the second solenoid coil 8g.

  As the interlock necessary state detection unit 12, for example, in an automatic lock type seat belt retracker (ALR), it is detected that the ALR is set to an automatic lock state and the child seat is fixed to the vehicle seat 2 by the seat belt 4. A signal for instructing to maintain the tension of the seat belt 4 set in the motor retractor that rotates the spool by the motor, an operation button for instructing to set the vehicle travel mode to the sport mode, or a rollover of the vehicle A sensor or the like for detecting

  In the vehicle sensor 8 of the seat belt retractor 3 of the second example configured as described above, the controller 9 detects the interlock based on the detection signal from the interlock required state detection unit 12 with the engine switch turned on. When it is determined that the operation is necessary, the second solenoid coil 8g is energized. Then, the second solenoid coil 8g generates an electromagnetic force to attract the inertia ball 8d and set it to the operating position indicated by the solid line in FIG. In that case, the inertial ball 8d is moved to the operating position by the solenoid coil 8e even in the suction state. As a result, the rotation of the spool of the seat belt retractor 3 in the seat belt withdrawing direction is locked. The second solenoid coil 8g exhibits an interlock function.

  Further, when the controller 9 determines that the interlock operation is not necessary based on the detection signal from the interlock required state detection unit 12, the energization to the second solenoid coil 8g is stopped. Then, the second solenoid coil 8e does not generate an electromagnetic force and does not attract the inertia ball 8d. Thereby, the inertia ball 8d is maintained in the non-actuated position. At this time, the inertial ball 8d can move to the operating position in an emergency.

  Further, when the second solenoid coil 8g is not energized for some reason when the interlock operation is necessary, the inertia ball 8d is not attracted by the second solenoid coil 8g, but the inertia ball 8d moves in an emergency. This is possible, and the lock function of the withdrawal of the seat belt 4 of the seat belt retractor 3 is exhibited. Therefore, the locking reliability of the seat belt retractor 3 is ensured even when the second solenoid coil 8g is not energized.

According to the seat belt retractor 3 of the second example, when the interlock operation is necessary, the inertia ball 8d is set and held at the operation position by the electromagnetic attraction force of the second solenoid coil 8g. Interlock operation can be performed stably. Thereby, the set tension | tensile_strength of the seatbelt 4 can be hold | maintained in the necessity state of an interlock operation | movement.
In order to further increase the electromagnetic attractive force of the inertial ball 8d by the second solenoid coil 8g, an iron core 8h can be provided as shown by a dotted line in FIG.

  Other configurations, other operations, and other effects of the vehicle sensor 8 and the seat belt retractor 3 of the second example are the same as those of the first example. The other configurations, other operations, and other effects of the seat belt device 1 of the second example including the seat belt retractor 3 of the second example are the same as those of the first example.

FIG. 4 is a front view schematically showing a vehicle sensor used in a third example of the embodiment of the seat belt retractor according to the present invention.
In the vehicle sensor 8 of the first example described above, the inertia ball 8d is held at the non-operating position by the electromagnetic attraction force of the solenoid coil 8e. In the vehicle sensor 8 of the third example, the solenoid coil 8e Electromagnetic attraction is not used. That is, as shown in FIG. 4, in the vehicle sensor 8 of the third example, the case 8 a is provided with an inertia ball rattling suppression holding portion 8 i.

  As shown in FIGS. 5A and 5B, the inertia ball rattling suppression holding portion 8i is a plane whose radius is the same as or substantially the same as the radius of the inertia ball 8d on the support surface of the inertia ball 8d of the case 8a. It is configured by a partially spherical concave portion 8j having a circular view. As shown in FIG. 5C, the inertial ball 8d is fitted and supported in the recess 8j of the rattling suppression holding portion 8i. As a result, the inertia ball rattling suppression holding portion 8i stably holds the inertia ball 8d without rattling in the non-actuated position when the vehicle sensor 8 is not required to operate.

  The vehicle sensor 8 of the third example has a solenoid coil 8k. The solenoid coil 8k is electrically connected to the controller 13, and the controller 13 is electrically connected to the battery 10 of the vehicle. The solenoid coil 8k is energized in an emergency so that the inertia ball 8d held by the rattling suppression holding portion 8i is attracted to the operating position, and the seat belt retracting direction of the spool of the seat belt retractor 3 is obtained. The rotation of is locked.

  Furthermore, the emergency detector 14 is electrically connected to the controller 13. The emergency detection unit 14 detects an emergency of the vehicle and outputs an electrical detection signal. The controller 13 controls energization to the solenoid coil 8k based on a detection signal from the emergency detection unit 14. That is, when the controller 13 determines that the vehicle is in an emergency based on the detection signal from the emergency detection unit 14, the controller 13 energizes the solenoid coil 8k. As the emergency detection unit 14, for example, an acceleration sensor, an obstacle detection sensor, a collision sensor, a rollover detection sensor, or the like can be used.

  In the vehicle sensor 8 of the seat belt retractor 3 of the third example configured as described above, the controller 13 determines that it is not an emergency based on the detection signal from the emergency detection unit 14 with the engine switch turned on. When energized, the solenoid coil 8k is not energized. Therefore, when the vehicle sensor 8 is not normally operated, the solenoid coil 8k does not generate electromagnetic force, and the inertial ball 8d is supported by the inertial ball rattling suppression holding portion 8i and stably held in the non-operating position. Is done. Thereby, rattling of the inertial ball 8d is suppressed.

  Further, when the controller 13 determines that it is an emergency based on the detection signal from the emergency detection unit 14 with the engine switch turned on, the solenoid coil 8k is energized. Then, the solenoid coil 8k generates an electromagnetic force. Since the inertia ball 8d is attracted by the solenoid coil 8k, it moves from the non-operation position together with the inertia force of the inertia ball 8d and is set to the operation position indicated by the solid line in FIG. In this case, the inertial ball 8d is moved to the operating position even if the inertial ball is stably supported by the rattling suppression holding portion 8i. As a result, the rotation of the spool of the seat belt retractor 3 in the seat belt withdrawing direction is locked.

Further, when the solenoid coil 8k is no longer energized for some reason, the inertia ball 8d is not attracted by the solenoid coil 8k, but the inertia ball 8d can be moved by the inertia force, and the The function of locking the drawer of the seat belt 4 is exhibited. Therefore, even if the solenoid coil 8k is not energized, the locking reliability of the seat belt retractor 3 is ensured.

  According to the seat belt retractor 3 of the third example, when the operation of the vehicle sensor 8 is not required, the inertial ball 8d is held by the rattling suppression holding portion 8i. Prevents rattling. Thereby, when the vehicle sensor 8 is not required to be operated, it is possible to effectively suppress the generation of sound due to the rattling of the inertia ball 8d.

  Further, when the vehicle sensor 8 is in an operation-necessary state, the inertial ball 8d is attracted by the electromagnetic force of the solenoid coil 8k. It can be moved to the operating position by inertial force. Thereby, the lock function of the drawer of the seat belt 4 of the seat belt retractor 3 can be exhibited in an emergency. Moreover, even if the solenoid coil 8k is not energized for some reason, the inertia ball 8d moves to the operating position by the inertia force in an emergency, so that the lock function of the seat belt retractor 3 of the seat belt retractor 3 is stabilized. Thus, the locking reliability of the seat belt retractor 3 can be ensured.

  Further, the inertia ball rattling suppression holding member is constituted by the inertia ball rattling suppression holding portion 8i provided integrally with the case 8a that accommodates the inertia ball 8d. It can be formed more easily, and the number of parts can be reduced.

  In order to further increase the electromagnetic attractive force of the inertia ball 8d by the solenoid coil 8k, an iron core 8m can be provided as shown by a dotted line in FIG. Further, the inertia ball shakiness suppressing holding portion 8i can be formed by a hole having a circular cross section instead of the partially spherical concave portion. Further, as shown in FIGS. 6 (a) to 6 (c), the inertia ball wobbling suppression holding portion 8i can also be constituted by a radially extending arc-shaped protrusion 8n arranged in an annular shape. . Furthermore, the inertia ball wobbling suppression holding portion 8i can also be configured by a pair of protrusions (not shown) having a cross-sectional arc shape arranged in parallel or substantially parallel to each other. In this case, it is preferable to take a means for preventing the inertial ball 8d from moving in the extending direction of the pair of protrusions.

  Other configurations, other operations, and other functions and effects of the vehicle sensor 8 and the seat belt retractor 3 of the third example are the same as those of the first example. Further, the other configurations, other operations, and other effects of the third example seat belt device 1 including the third example seat belt retractor 3 are the same as those of the first example.

  The present invention is not limited to the above examples. For example, in each of the above-described examples, the inertia ball 8d is used as the inertial body. However, the inertial body of the present invention is described in, for example, Patent Document 1 as long as it is an inertial body that moves at a large deceleration greater than a predetermined value. Inertia composed of a small mass portion of a hollow cylinder provided in the lower portion and a large mass portion having a larger diameter and a solid truncated cone shape provided on the small mass portion. Any other inertial body can be used, including the body. In short, the present invention can be modified in various ways within the scope of the technical matters described in the claims.

  The seatbelt retractor and seatbelt device according to the present invention is a spool in which an inertial body of a vehicle sensor is operated by this deceleration in an emergency in which a large deceleration occurs in a vehicle such as a vehicle collision in a vehicle such as an automobile. It can be suitably used for a seat belt retractor and a seat belt device in which the rotation in the seat belt pull-out direction is locked.

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 3 ... Seat belt retractor, 4 ... Seat belt, 6 ... Tongue, 7 ... Buckle, 8 ... Vehicle sensor, 8a ... Case, 8b ... Lever, 8c ... Locking claw, 8d ... Inertial ball, 8e ... solenoid coil, 8f ... iron core, 8g ... second solenoid coil, 8h ... iron core, 8i ... inertial ball rattling suppression holding part, 8j ... recess, 8k ... solenoid coil, 8m ... iron core, 8n ... projection part, DESCRIPTION OF SYMBOLS 9 ... Controller, 10 ... Battery, 11 ... Vehicle sensor operation unnecessary state detection part, 12 ... Interlock required state detection part, 13 ... Controller, 14 ... Emergency detection part

Claims (6)

A spool for winding up the seat belt;
An operating position that is set to a non-operating position that allows rotation of the spool in the seat belt withdrawing direction at a normal time, and that locks rotation of the spool in the seat belt withdrawing direction by detecting a deceleration that exceeds a predetermined level in an emergency; A vehicle sensor having at least an inertial body that moves between
In a seat belt retractor comprising at least
The vehicle sensor further includes an inertial body that fixes the inertial body in the non-operating position in a normal state to suppress rattling of the inertial body and that can move the inertial body to the operating position in an emergency. A seat belt retractor comprising a sticking suppression holding member.   The inertial body rattling suppression holding member is normally energized and sucks the inertial body to fix it in the non-operating position and is deenergized in an emergency so that the inertial body can be moved to the operating position. The seat belt retractor according to claim 1, wherein the seat belt retractor is a solenoid.   The seat belt retractor according to claim 2, further comprising a control unit that controls energization of the solenoid.   4. The seat belt retractor according to claim 2, further comprising a second solenoid that is energized when it is necessary to forcibly lock to move the inertial body to the operating position by suction. 5. The inertial body rattling suppression holding member is an inertial body rattling suppression holding part that fixes and supports the inertial body in the non-operating position in a normal state and enables the inertial body to move to the operating position in an emergency. ,
The inertial body shaking suppression holding part is provided in a case in which the inertial body is accommodated,
The seat belt retractor according to claim 1, further comprising a solenoid that is energized in an emergency to move the inertial body to the operating position by sucking the inertial body. A seatbelt that restrains passengers in an emergency,
A seat belt retractor that winds up the seat belt so that it can be pulled out;
A tongue slidably supported on the seat belt;
A buckle on which the tongue is releasably locked;
In a seat belt device comprising at least
The seat belt device according to any one of claims 1 to 5, wherein the seat belt retractor is the seat belt retractor.

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