JP5998100B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device or the like having a lock mechanism capable of locking a webbing drawer in an emergency such as a vehicle collision.

  For example, FIG. 1 of Patent Literature 1 discloses a seat belt retractor 3 of a seat belt device, and FIG. 3 of Patent Literature 1 shows a spool 9, a locking base 20, and a torsion constituting a webbing reel stored in the seat belt retractor 3. Bar 12 etc. are disclosed. In order to lock the pull-out of the webbing from the webbing reel in the event of an emergency such as a vehicle collision, the spool 9 of Patent Document 1 is locked via the locking base 20 and the torsion bar 12. Specifically, when the locking base 20 of Patent Document 1 is locked, rotation of the upper portion of the torsion bar 12 (first torque transmitting portion 18) is prohibited, while the torsional deformation of the torsion bar 12 causes the lower portion of the torsion bar 12 to rotate. The rotation of the (second torque transmission unit 24) is allowed and the rotation of the spool 9 is also allowed. Thus, since the rotation of the spool 9 is allowed, the webbing can be pulled out from the spool 9, and the burden on the occupant due to the webbing in an emergency is reduced.

JP 2012-30636 A

  However, with the end of the torsional deformation of the torsion bar 12 of Patent Document 1, the rotation of the spool 9 is prohibited from being allowed to rotate, and the end of the torsional deformation of the torsion bar 12 depends on the specifications of the torsion bar 12. . In other words, once the specification of the torsion bar 12 is designed or determined, the end of torsional deformation of the torsion bar 12 is fixed. Therefore, the seat belt device of Patent Document 1 cannot adjust the prohibition of the rotation of the spool 9 when locked.

FIG. 3 of Patent Document 1 discloses a stopper 23 and an energy absorbing (EA) member 27. When the stopper 23 is movable, the torsional deformation of the torsion bar 12 may be limited by crushing the energy absorbing member 27. it can. However, since the number of times the movement amount or rotation of the stopper 23 is dependent on the specifications of the stopper 23, when once the design or determine the specifications of the stopper 23, the number of times the movement amount or rotation of the stopper 23, thus being fixed. As a result, the end of the torsional deformation of the torsion bar 12 is fixed. Therefore, the seat belt device of Patent Document 1 including the stopper 23 and the energy absorbing member 27 cannot adjust the prohibition of the rotation of the spool 9 when locked.

  One object of the present invention is to provide a seat belt device capable of adjusting the prohibition of the rotation of the spool portion when locked. Other objects of the present invention will become apparent to those skilled in the art by referring to the aspects and preferred embodiments exemplified below and the accompanying drawings.

  In the following, in order to easily understand the outline of the present invention, embodiments according to the present invention will be exemplified.

In the first aspect, the seat belt device comprises:
A spool portion capable of winding the webbing;
A rotation detection unit for detecting the number of times the rotation of the spool,
A lock mechanism capable of locking the rotation of the spool portion;
A tone bar portion that allows the spool portion to rotate when the spool portion is locked by the locking mechanism;
And determining the control unit whether the number of times the rotation reaches the allowable number of times,
A rotation prohibiting mechanism capable of prohibiting the withdrawal of the webbing from the spool portion;
With
When the rotational speed times reaches the allowable number of times, the control unit generates a rotation inhibition signal,
The rotation prohibition mechanism operates in response to the rotation prohibition signal and prohibits the rotation of the spool portion by the tone bar portion.

According to the first aspect, even when the spool portion is locked by the locking mechanism, the rotation of the spool portion is allowed by the torsional deformation of the tone bar portion. Rotation detecting unit detects the number of times the rotation of the spool portion to be locked by the lock mechanism, the control unit determines whether or not to reach the allowable number of times the number of times rotation is set in advance. When the number of rotation times reaches the allowable number of times, the control unit generates a rotation inhibition signal, the rotation prohibition mechanism is actuated in response to rotation inhibition signal. As a result, the rotation of the spool portion at the time of locking is prohibited. In other words, by adjusting the preset allowable number of times , the seat belt device can adjust the prohibition of the rotation of the spool portion when locked.

In a second aspect dependent on the first aspect, the seat belt device comprises:
It may further comprise a sheet part state detection part for detecting the state of the sheet part,
The control unit may set the allowable number of times based on the state of the sheet unit.

  According to the 2nd aspect, the sheet | seat part state detection part can detect the state of a sheet | seat part. In other words, the seat belt device can adjust the prohibition of the rotation of the spool portion when locked according to the state of the seat portion.

In a third aspect subordinate to the second aspect,
The seat state detection unit may detect a seat position and a seat back reclining angle as the state of the seat unit.

  According to the third aspect, the seat belt device can adjust the prohibition of the rotation of the spool portion at the time of locking according to the position of the seat and the reclining angle of the seat back.

In a fourth aspect depending on the second or third aspect, the seat belt device comprises:
An occupant physique detection unit that detects the physique of the occupant seated in the seat part may further be provided,
The control unit may set the allowable number of times based on the state of the seat unit and the physique of the occupant.

  According to the fourth aspect, the seat belt device allows the rotation of the spool portion at the time of locking according to both the occupant's physique and the state of the seat portion (for example, the position of the seat and the reclining angle of the seat back). The ban can be adjusted.

  Those skilled in the art will readily understand that the illustrated embodiments according to the present invention can be further modified without departing from the spirit of the present invention.

The structural example of the seatbelt apparatus according to this invention is shown. An explanatory view of a plurality of data which the control part of Drawing 1 handles is shown. The explanatory view of the lock mechanism and rotation prohibition mechanism of the retractor of FIG. 2 is shown. Explanatory drawing of the rotation detection part and power transmission mechanism of the retractor of FIG. 3 is shown. FIG. 3 is an explanatory diagram of an allowable number of times preset in the control unit of FIG. 2. An explanatory view of a state of a sheet part of Drawing 1 is shown. The operation example of the control part of FIG. 2 is shown.

  The preferred embodiments described below are used to facilitate an understanding of the present invention. Accordingly, those skilled in the art should note that the present invention is not unduly limited by the embodiments described below.

  FIG. 1 shows a configuration example of a seat belt device according to the present invention. As shown in FIG. 1, for example, a seat belt device 10 provided in a vehicle such as an automobile includes a retractor 16 that can wind up a webbing 13 that restrains the body of an occupant 11 such as a driver or a passenger to a seat portion 12. Is provided. The retractor 16 is controlled by a control unit 35 called, for example, a seat belt ECU (electronic control unit), and the webbing 13 restrains, for example, the first portion 13a that restrains the upper body of the occupant 11 and the waist of the occupant 11. And a second portion 13b. In FIG. 1, for example, one end (or the second portion 13 b side) of the webbing 13 is fixed to the vehicle body portion at the lower part of the passenger compartment by an anchor plate 14. Further, for example, the other end (the first portion 13a side) of the webbing 13 is folded back by a through anchor 15 provided near the shoulder of the occupant 11, and the webbing belt reel in the retractor 16 (FIG. 3 or 4). It is connected to the inner spool part 42). A tongue plate 17 is attached to the webbing 13, and the webbing 13 is detachably attached to, for example, a buckle 18 fixed near the bottom of the seat portion 12 via the tongue plate 17. The buckle 18 is provided with a buckle switch 19 that detects the connection between the tongue plate 17 and the buckle 18. When the buckle switch 19 is turned on, the control unit 35 determines that the belt 13 is attached to the occupant 11. Can do.

  The seat belt device 10 may not include all of the components such as the retractor 16 illustrated in FIG. 1, such as the webbing 13, the tongue plate 17, the buckle 18, and the control unit 35, or each of these components. Some may be provided, and in addition, other components described below may also be provided. In other words, the seat belt device 10 of FIG. 1 is only shown as an exemplary embodiment, and for at least one purpose of the invention, the seat belt device 10 comprises at least one component. Can do.

  FIG. 2 is an explanatory diagram of a plurality of signals handled by the control unit 35 of FIG. As shown in FIG. 2, the control unit 35 is connected to, for example, the sensor unit 51, and the signal from the sensor unit 51 determines whether or not the current state is an emergency state such as a vehicle collision, sudden deceleration, or sudden steering. Can be detected. The sensor unit 51 in FIG. 2 includes at least one sensor, and the sensor unit 51 can be configured by an acceleration sensor, for example. Further, the control unit 35 may be connected to, for example, another ECU 52, and may input a signal indicating a detection result in the other ECU 52, and detects whether or not the current state is an emergency state based on the signal. May be. In other words, the control unit 35 can detect whether or not the current state is an emergency state based on signals from the sensor unit 51 and other external devices 53 such as the ECU 52.

When the current state is an emergency state, specifically, when the rearward acceleration of the vehicle is greater than or equal to a predetermined acceleration, the control unit 35 can send a signal to the retractor 16. For example, the actuator 38 of the retractor 16 can lock the rotation of the spool portion 42 in FIG. 3 or 4 by a signal from the control portion 35. However, since the shaft (rotating shaft) of the spool portion 42 is constituted by the torsion bar portion 22a, the rotation of the spool portion 42 at the time of locking is allowed by the torsional deformation of the tone bar portion 22a. Therefore, the rotation detecting unit 39 of the retractor 16 can detect the number of times the rotation of the spool 42, and sends a signal representing the number of times the rotation of the spool unit 42 to the control unit 35.

When the current is in the emergency, the control unit 35 may then determine whether the number of times the rotation of the spool 42 reaches the allowable number of times. When the number of rotation times reaches the allowable number of times, the control unit 35 can send to the retractor 16 signal (rotation prohibition signal). For example, the inflator 44 of the retractor 16 is ignited by a signal (rotation prohibition signal) from the control unit 35, thereby prohibiting the rotation of the spool unit 42 by the torsion bar unit 22 a. By adjusting the preset allowable number of times , the seat belt device 10 can adjust the prohibition of the rotation of the spool portion 42 when locked.

  FIG. 3 is an explanatory view of the locking mechanism and the rotation prohibiting mechanism of the retractor 16 of FIG. As shown in FIG. 2, the retractor 16 can include a lock mechanism 34 and a rotation prohibiting mechanism 49. In FIG. 3, the lock mechanism 34 includes, for example, an actuator 38, a first locking portion 37, and a first locked portion 36. When the present is an emergency state, the actuator 38 can move the first locking portion 37, whereby the first locking portion 37 (claw portion) is moved to the first locked portion 36 ( Locking to the first gear portion of the locking base). Since the first locking portion 37 is fixed to the webbing reel frame 31, the first locked portion is locked when the first locking portion 37 is locked to the first locked portion 36. The rotation of 36 is locked with respect to the webbing reel frame 31.

However, since one end and the other end of the torsion bar portion 22a are connected to the first locked portion 36 and the spool portion 42, respectively, the rotation of the spool portion 42 is locked via the lock mechanism 34. Even so, the rotation of the spool portion 42 at the time of locking is permitted by the torsional deformation of the tone bar portion 22a. However, when the number of times the rotation of the spool 42 after the rotation of the spool portion 42 is locked via the locking mechanism 34 has reached the allowable number of times, rotation inhibiting mechanism 49, the signal from the control unit 35 (rotation prohibited The rotation of the spool portion 42 by the torsion bar portion 22a can be prohibited.

In FIG. 3, the rotation prohibiting mechanism 49 includes, for example, an inflator 44, a second locking portion 43, a second locked portion 41, and the like. When the number of times the rotation of the spool 42 reaches the allowable number of times, the inflator 44 is ignited, and the first protrusion of the ring portion 45 provided outside of the spool portion 42 is pushed, the entire ring portion 45 Rotate. As the ring portion 45 rotates, the second protrusion 46 of the ring portion 45 rides on the protrusion 47 of the webbing reel frame 31. In other words, the ring portion 45 moves away from the base of the webbing reel frame 31 and approaches the second locked portion 41. Thereby, the 2nd latching | locking part 43 (claw part) can latch to the 2nd to-be-latched part 41 (2nd gear part of a locking base). Since the second locking portion 41 is fixed with respect to the spool portion 42, when the second locking portion 41 is locked to the second locked portion 41, The rotation (that is, the rotation of the spool portion 42) is prohibited with respect to the second locked portion 41 (and the webbing reel frame 31 via the lock mechanism 34).

Thus, when the number of times the rotation of the spool 42 reaches the allowable number of times, rotation inhibiting mechanism 49 is capable prohibiting withdrawal of the webbing 13 from the spool 49 (the pull-out direction 13d). Incidentally, (see FIG. 4) rotation detecting section 39 for detecting the number of times the rotation of the spool 42 at the time of locking can be provided on the webbing reel frame 31. Also, when the present is an emergency condition, the actuator 38 may not be activated immediately. In other words, when the current state is an emergency state, the control unit 35 performs winding of the webbing 13 on the spool unit 49 (reverse direction of the pulling direction 13d) via the power transmission mechanism 24 (see FIG. 4), and then In addition, the actuator 38 may be activated. In this case, the actuator 38 sends a signal indicating the operation time of the actuator 38 (that is, when the spool portion 42 is locked by the lock mechanism 34) to the control unit 35, and the control unit 35 operates after the actuator 38 is operated ( that is, it is possible to grasp the number of times the rotation of the spool 42 after the rotation of the spool 42 is locked) through the locking mechanism 34.

In the lock mechanism 34 of FIG. 3, the actuator 38 is electrically operated in accordance with a signal from the control unit 35. For example, when the rearward acceleration of the vehicle is equal to or higher than a predetermined acceleration, or the webbing 13 is pulled out. When the speed is equal to or higher than a predetermined speed, the lock mechanism 34 itself may be mechanically operated, and the spool portion 42 may be locked to the webbing reel frame 31 via the torsion bar portion 22a. In this case, the control unit 35 may detect a predetermined acceleration, a predetermined speed, and the like by the sensor unit 51, the rotation detection unit 39, and the like. In other words, the control unit 35 locks the spool unit 42 by the lock mechanism 34. when estimating the being, you may know the number of times subsequent rotation of the spool 42.

FIG. 4 is an explanatory diagram of the rotation detector 39 and the power transmission mechanism 24 of the retractor 16 of FIG. As shown in FIG. 4, the spool portion 42 is normally rotatable relative to the webbing reel frame 31, the rotation detecting unit 39 can detect the number of times the rotation of the spool 42. The rotation detection unit 39 is constituted by, for example, a rotation angle sensor, and the rotation angle sensor has, for example, a magnetic disk and two Hall ICs. In FIG. 4, a rotation detection unit 39 or a magnetic disk is provided on the shaft (torsion bar unit 22a) of the spool unit 42, and the rotation detection unit 39 or the two Hall ICs are, for example, alternating between an N pole region and an S pole region. movement of the circumferential edges of the magnetic disk arrangement is repeated for (i.e., magnetic disk speed of the rotating round = number of times the rotation of the spool portion 42) can output two pulse signals P1, P2 representing the. Control unit 35 can detect the result type (e.g. two pulse signals P1, P2) at the rotation detecting section 39 to grasp the number of times the rotation of the spool 42.

  The retractor 16 may include a motor 23. In this case, the spool unit 42 is rotated by the motor 23 and the power transmission mechanism (gear mechanism) 24 until the spool unit 42 is locked by the lock mechanism 43. Can be done. In FIG. 4, the power transmission mechanism 24 is provided on the shaft (torsion bar portion 22 a) of the spool portion 42 and the drive shaft 23 a of the motor 23, and the spool portion 42 also rotates as the drive shaft 23 a of the motor 23 rotates. . At this time, the control unit 35 outputs a signal to the energization amount adjustment unit 28, and the energization amount adjustment unit 28 controls or adjusts the energization amount of the drive current I1 supplied from the power source 27 to the motor 23 according to the signal. be able to. As described above, the control unit 35 may control the driving current I1 of the motor 23 to control the rotation of the spool unit 42 (that is, winding of the webbing 13, for example). In other words, when the current state is an emergency state, the control unit 35 may function as an electric pretensioner mechanism.

In FIG. 4, when the current state is an emergency state, the control unit 35 sets the lock mechanism 34 to, for example, the drive current I2 immediately without using the electric pretensioner mechanism or after using the electric pretensioner mechanism. Accordingly, the actuator 38 of the lock mechanism 34 is operated, and the spool portion 42 is locked with respect to the webbing reel frame 31. Thereafter, when the number of times the rotation of the spool 42 reaches the allowable number of times, the control unit 35 can control the rotation inhibiting mechanism 49 for example, the drive current I3, thereby, the inflator of rotation inhibiting mechanism 49 is actuated Thus, the rotation of the spool portion 42 is prohibited with respect to the webbing reel frame 31.

Preferably, the control unit 35 sets the allowable number of times based on the state of the sheet unit 12 in FIG. In this case, the seat portion 12 shown in FIG. 1 has, for example, a position adjustment structure capable of adjusting the position of the seat portion 12 in the front-rear direction in the passenger compartment and fixing the seat portion 12 at a predetermined position. doing. Moreover, the seat part 12 of FIG. 1 has an angle adjustment structure which can adjust the reclining angle of the seat part 12 in a vehicle interior and can fix the reclining angle at a predetermined angle, for example. For example, the other ECU 52 in FIG. 2 can be configured by a seat ECU capable of adjusting the state of the seat unit 12, and the control unit 35 can detect the detection result (for example, the seat unit 12) in the other ECU 52 (seat unit state detection unit). The position of the seat portion 12 such as the position of the seat portion 12 and the reclining angle of the seat portion 12) can be input.

In addition, preferably, the control unit 35 sets the allowable number of times based on the physique of the occupant 11 seated on the seat unit 12 of FIG. In this case, the seat part 12 shown by FIG. 1 measures the weight of the passenger | crew 11, for example. For example, the sensor unit 51 of FIG. 2 can be configured by a weight sensor that detects the weight of the occupant 11 seated on the seat unit 12, and the control unit 35 detects the detection result (for example, the occupant physique detection unit) (for example, A signal representing the occupant 11's physique such as the weight of the occupant 11) can be input.

The vehicle may include, for example, an SRS (supplemental restraint system), and the airbag ECU of the SRS is, for example, a weight sensor, a seat ECU, an acceleration sensor, and the like, for example, the presence or absence of the occupant 11, the physique of the occupant 11, and the seat portion 12, the reclining angle of the seat portion 12, the presence or absence of a vehicle collision, and the like can be grasped, and it can be determined whether or not to deploy an SRS airbag (not shown). In other words, for example, the airbag ECU can constitute the external device 53 such as the other ECU 52 of FIG. 1, and the control unit 35 (seat belt ECU) inputs various information grasped by the airbag ECU, The allowable number of times may be set, and then the time when the spool unit 42 is locked by the lock mechanism 34 may be estimated or determined.

FIG. 5 is an explanatory diagram of the allowable number of times preset in the control unit 35 of FIG. For example, when an ACC (accessory) switch (not shown) is turned on, the power source of the control unit 35 (seat belt ECU) is turned on, and the control unit 35 executes a program for executing the flowchart shown in FIG. Run. In step S1, the control unit 35 determines whether or not an IG (ignition) switch (not shown) is turned on. When the IG switch is turned on, the control unit 35 outputs a signal indicating a detection result (for example, the weight of the occupant 11) in the occupant physique detection unit (for example, a sensor unit 51 such as a weight sensor, an airbag ECU, or another ECU 52). input.

  In step S <b> 2, the control unit 35 determines whether the weight of the occupant 11 is smaller than 30 [kg], for example, as the physique of the occupant 11. That is, the control unit 35 can determine whether the occupant 11 is small in size or whether the occupant is a child. When the weight of the occupant 11 is smaller than 30 [kg], the control unit 35 detects the detection result (for example, the position of the seat unit 12 and the position of the seat unit 12 and the other ECU 52 such as the seat ECU and the airbag ECU). A signal representing the reclining angle of the seat portion 12 is input.

  In step S <b> 3, the control unit 35 grasps the state of the sheet unit 12. Specifically, the control unit 35 determines the distance G from the headrest 12a of the seat unit 12 to the instrument panel 5 based on the position of the seat 12c (see FIG. 6) of the seat unit 12 and the angle of the seat back 12b of the seat unit 12. Calculate The control unit 35 classifies the distance G into, for example, three categories, and selects one of steps S4 to S6 based on the classified category (state of the seat unit 12) and the determination result in step S2 (physique of the occupant 11). Run one.

For example, when the distance G is smaller than the first predetermined distance, step S4 is executed, and the distance G smaller than the first predetermined distance belongs to the first category (small), for example, and the allowable number of times T Is set to 0.5 rotation, for example. For example, when the distance G is equal to or larger than the first predetermined distance and the distance G is smaller than the second predetermined distance, step S5 is executed, and the distance G at that time Belongs to the second category (medium), for example, and the allowable number of times T is set to 1.5 rotations, for example. For example, when the distance G is equal to or larger than the second predetermined distance, step S6 is executed, and the distance G at that time belongs to, for example, the third category (large) and is allowed. The number of times T is set to 2.5 rotations, for example.

When the weight of the occupant 11 is not smaller than 30 [kg], the control unit 35 calculates the distance G from the headrest 12a of the seat unit 12 to the instrument panel 5 as in step S3. The control unit 35 classifies the distance G into, for example, three categories, and selects one of steps S7 to S9 based on the classified category (state of the seat unit 12) and the determination result (physique of the occupant 11) in step S2. Run one. For example, when the distance G belongs to the first category (small), the allowable number of times T is set to 0 rotation, for example (see step S7). When the distance G belongs to the second category (medium), for example, the allowable number T is set to 1.0 rotation, for example (see step S8). For example, when the distance G belongs to the third category (large), the allowable number of times T is set to, for example, 2.0 rotations (see step S9).

Thus, the control unit 35 sets the allowable number T so that the allowable number T increases as the distance G increases. In addition, the control unit 35 sets the allowable number T so that the allowable number T increases as the physique of the occupant 11 decreases. By setting the allowable number T based on the state of the seat portion 12 and the physique of the occupant 11, the burden on the occupant 11 due to the webbing 13 in an emergency is more appropriately reduced.

  FIG. 6 is an explanatory diagram of the state of the sheet portion 12 of FIG. As shown in FIG. 6, the distance G from the headrest 12a of the seat portion 12 to the instrument panel 5 is based on the seat Bc position B of the seat portion 12 and the seat back 12b angle D of the seat portion 12 (formula ( 1) to (3)).

G = (E2 + F2) 0.5 (1)
E = C × cos (D−π / 2) + B (2)
F = C × sin (D−π / 2) + A (3)

  Each of the distances A and C is a known value determined by the type of the vehicle, and the distance B and the angle D are determined by a seat part state detection unit (for example, another ECU 52 such as a seat ECU or an airbag ECU). Detected. The control unit 35 can calculate the distance G based on the detected distance B (position of the seat 12c) and angle D (reclining angle of the seat back 12b) (steps S3 and S7 in FIG. 6).

FIG. 7 shows an operation example of the control unit 35 of FIG. For example, after the allowable number of times is set, the control unit 35 executes a program for executing the flowchart shown in FIG. In step S11, the control unit 35 determines whether or not the SRS airbag has been deployed. In other words, the control unit 35 inputs a signal from, for example, an SRS airbag ECU, and determines whether or not the current state is an emergency state. Immediately after the SRS airbag is deployed, the control unit 35 can control, for example, the actuator 38 of the retractor 16 to lock the rotation of the spool unit 42 in FIG. 3 or 4. The vehicle may not include the SRS, and instead of step S11, the control unit 35 may determine whether or not the lock mechanism 34 has locked the rotation of the spool unit 42.

In step S12, the control unit 35 inputs the number of times the rotation of the spool 42 at the time of locking the rotation detector 39. In other words, the control unit 35 sets the number of times the rotation of the spool portion 42 immediately after the air bag of the SRS is deployed as the number of times the initial rotation speed times times the number and the initial rotation of the current rotation calculates a difference (number of times the rotation of the spool 42 in the locked state) with.

In step S13, the control unit 35 determines whether is greater than or the allowable number of times the number of times the rotation is equal to the permissible number of spool 42 at the time of locking. In other words, the control unit 35 immediately after the air bag of the SRS is deployed rpm round of spool portion 42 of the (initial speed times) (the number of times the rotation of the spool 42 in the locked state) is acceptable It is determined whether or not the number of times is reached. Until the number of times the rotation of the spool portion 42 when the lock reaches the allowable number of times, the control unit 35 repeats the steps S12, S13. When the number of times the rotation of the spool 42 reaches the allowable number of times during the locking, the control unit 35 executes step S14.

In step S14, the control unit 35 controls, for example, the inflator 44 of the retractor 16, and immediately after the SRS air bag is deployed, that is, immediately after the spool unit 42 is locked, the spool unit 42 rotates. Tolerance can be prohibited by using an arbitrarily set allowable number of times . As described above, the seat belt device 10 including the control unit 35 can control the allowable rotation of the spool portion 42 by the torsional deformation of the torsion bar portion 22a by an allowable number of times , and can allow the rotation of the spool portion 42 when locked. The prohibition can be adjusted electrically.

  The present invention is not limited to the above-described exemplary embodiments, and those skilled in the art will be able to easily modify the above-described exemplary embodiments to the extent included in the claims. .

  5 ... 10 ... Seat belt device, 11 ... Passenger, 12 ... Seat part, 12a ..., 12b ..., 12c ..., 13 ... Webbing, 13a, 13b ... Part, 13d ..., 14 ... Anchor plate, 15 ... Through anchor, 16 ... Retractor, 17 ... Tang plate, 18 ... Buckle, 19 ... Buckle switch, 22a ... Torsion bar section, 23 ... Motor, 23a ... Drive shaft, 24 ... Power transmission mechanism, 27 ..., 28 ..., 31 ... Webbing reel frame, 34 ... -Lock mechanism, 35 ... control part, 36 ... first locked part, 37 ... first locking part, 38 ... actuator, 39 ... rotation detection part, 41 ..Second locked part, 42 ... spool part, 3 ... second locking portion, 44 ... inflator, 45 ... ring portion, 46,47 ... projection portion, 49 ... rotation prohibiting mechanism, 51 ... sensor portion, 52. ..ECU, 53 ... external device

Claims (4)

A spool portion capable of winding the webbing;
A rotation detection unit for detecting the number of times the rotation of the spool,
A lock mechanism capable of locking the rotation of the spool portion;
A tone bar portion that allows the spool portion to rotate when the spool portion is locked by the locking mechanism;
Said detected by the rotation detection unit, wherein the determining whether or not the control unit the rotational speed of the rotating of the spool permitted by the torsion bar portion reaches the allowable number of times,
A rotation prohibiting mechanism capable of prohibiting the withdrawal of the webbing from the spool portion;
With
The detected by the rotation detecting section, when the rotational speed of the rotating of the spool permitted by the torsion bar portion reaches the allowable number of times, the control unit generates a rotation inhibition signal,
The rotation prohibiting mechanism operates in response to the rotation prohibiting signal, and prohibits the rotation of the spool portion by the tone bar portion. The rotation prohibiting mechanism has an inflator that prohibits pulling out the webbing from the spool portion when ignited, and
The seat belt device according to claim 1, wherein the inflator is ignited when the control unit generates the rotation inhibition signal. A seat state detection unit that detects the seat position and the reclining angle of the seat back;
The seat belt device according to claim 1 or 2, wherein the control unit sets the allowable number of times based on the position of the seat and the reclining angle of the seat back. An occupant physique detection unit that detects the physique of an occupant seated in the seat part;
The seat belt device according to claim 3, wherein the control unit sets the allowable number of times based on the position of the seat, the reclining angle of the seat back, and the physique of the occupant.

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