JP2006160056A - Webbing take-up device and three-point seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the timing to operate a motor with a simple configuration when the function of a tension reducer and taking off or taking out of the webbing for reducing or resolving excessive oppressive feeling during wearing of a webbing is performed by the motor. <P>SOLUTION: A control means detects an off-state of a buckle switch and rotates the output shaft of a motor by a predetermined amount in the normal direction. An energizing force for taking up of the spring acting on a winding shaft is increased and the webbing is taken up to the winding shaft thereby. The control means rotates the output shaft of the motor in the reverse direction after a predetermined time (for example, the time required for totally storing the webbing) has elapsed since the output shaft of the motor is rotated by a predetermined amount in the normal direction. The energizing force taking up of the spring applied to the winding shaft is reduced thereby. Mountability (drawability) of the webbing can be good and the excessive oppressive feeling during wearing of the webbing can be reduced or resolved by maintaining the state until the next releasing of the buckle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a three-point seat belt device for a vehicle and a webbing retractor that constitutes the three-point seat belt device and winds and stores an occupant restraining webbing on a take-up shaft.

  As a webbing take-up device, a spring for applying a take-up biasing force to a take-up shaft is locked to a spring holding box, and the spring holding box is rotated by a motor to adjust the take-up biasing force by the spring. There is a known one equipped with a so-called tension reducer (see, for example, Patent Document 1).

  In this type of webbing take-up device, when the occupant puts on the webbing, the winding urging force by the spring can be reduced (torque down) to improve the webbing wearability. An excessive feeling of pressure at the time can be reduced or eliminated. On the other hand, when the occupant releases the wearing state of the webbing, it is possible to secure a good winding property of the webbing by increasing the winding biasing force by the spring (torque up).

By the way, in the webbing take-up device as described above, it is preferable that the motor is operated by detecting the occupant's riding operation as the timing of the torque reduction. However, in order to detect the occupant's boarding operation, for example, a door switch that detects the open / closed state of the door or a seat switch that detects the seated state of the occupant is necessary, which causes an increase in cost.
Japanese Utility Model Publication No. 63-5965

  In consideration of the above facts, the present invention operates the motor when performing the function of a tension reducer for reducing or eliminating excessive feeling of pressure when the webbing is mounted and the function for assisting the winding and drawing of the webbing by the motor. It is an object of the present invention to provide a webbing retractor that can control timing with a simple configuration, and a three-point seat belt device configured by applying the webbing retractor.

  In order to solve the above-mentioned problem, a webbing take-up device according to claim 1 is provided with a spring that is connected at one end to a take-up shaft from which a webbing is taken up and pulled out and applies a take-up biasing force to the take-up shaft. The other end of the spring is locked and rotatably provided, and the winding biasing force by the spring is increased by rotating in the forward direction, and the winding by the spring is rotated by rotating in the reverse direction. A spring holding box for reducing the urging force and an output shaft are connected to the spring holding box, the spring holding box is rotated in the forward direction by the forward rotation of the output shaft, and the spring holding box is rotated by the reverse rotation of the output shaft. A motor for rotating the box in the reverse direction, and when the occupant releases the webbing mounting state, the output shaft of the motor is rotated forward by a predetermined amount, and It is characterized by and a control means for a predetermined amount reversely the output shaft of the motor after a predetermined time has elapsed.

  In the webbing take-up device according to claim 1, when the occupant releases the wearing state of the webbing (for example, when the tongue plate attached to the webbing is released from the buckle device), the output shaft of the motor is controlled by the control means. Is rotated forward by a predetermined amount. For this reason, the spring holding box connected to the output shaft of the motor is rotated by a predetermined amount in the forward direction, and the winding biasing force of the spring applied to the winding shaft is increased. Thereby, the webbing is wound around the winding shaft by the increased winding biasing force.

  Further, the control means reverses the output shaft of the motor by a predetermined amount after elapse of a predetermined time (for example, the time required for the entire webbing to be stored) after rotating the motor output shaft by a predetermined amount as described above. For this reason, the spring holding box is rotated by a predetermined amount in the reverse direction, and the winding urging force of the spring applied to the winding shaft is reduced. Therefore, by maintaining this state until the next webbing wearing state is released, it is possible to improve the webbing wearability (drawability) and to reduce or eliminate excessive feeling of pressure when the webbing is worn (function of tension reducer). .

  Thus, in the webbing take-up device according to the first aspect, when the function of the tension reducer and the auxiliary function for winding and drawing out the webbing are performed by the motor, the control means sets the timing for operating (rotating) the motor. Since the detection is based on the release of the occupant's webbing wearing state and the time elapsed since the wearing state was released, the configuration is simple.

  The webbing take-up device according to a second aspect of the present invention is the webbing take-up device according to the first aspect, wherein when the amount of the webbing taken up to the take-up shaft exceeds a predetermined value, the webbing take-up device pulls out the webbing. It is characterized in that it is provided with a drag applying means for applying a predetermined drag.

  In the webbing take-up device according to claim 2, when the take-up amount of the webbing to the take-up shaft exceeds a predetermined value (including a state where the webbing is fully stored in the webbing take-up device), A predetermined drag is applied to the webbing drawer by the applying means. Therefore, for example, even when the vehicle travels and vibration occurs in the fully retracted state of the webbing (that is, the state in which the winding biasing force of the spring applied to the winding shaft is reduced), the webbing extends unnecessarily. Can be prevented.

  The webbing take-up device according to a third aspect of the present invention is the webbing take-up device according to the second aspect, wherein the drag application means is provided rotatably in the vicinity of the outer side in the radial direction of the take-up shaft. A pressing lever that is urged toward the take-up shaft side and abuts against a take-up portion of the webbing to the take-up shaft when the take-up amount exceeds a predetermined value, and the take-up amount is a predetermined value. In a state of less than the above, a stopper that restricts the rotation of the pressing lever toward the take-up shaft by contacting the pressing lever is provided.

  In the webbing take-up device according to claim 3, when the winding amount of the webbing to the take-up shaft becomes a predetermined value or more, the pressing lever provided rotatably in the vicinity of the outer side in the radial direction of the take-up shaft Abuts on the winding portion to the winding shaft. Since this pressing lever is always urged toward the winding shaft, a predetermined drag is applied to the webbing drawer. On the other hand, when the winding amount of the webbing on the winding shaft becomes less than a predetermined value, the pressing lever contacts the stopper, and thereby the rotation of the pressing lever toward the winding shaft is restricted. Thereby, the contact state of a press lever and webbing is cancelled | released, and provision of the said drag is cancelled | released.

  The webbing take-up device according to a fourth aspect of the present invention is the webbing take-up device according to any one of the first to third aspects, wherein the control means causes the output shaft of the motor to rotate forward by the predetermined amount. The timing is characterized in that the timing is determined by the control means that the occupant has got off the vehicle.

  In the webbing retractor according to the fourth aspect, the control means causes the motor output shaft to rotate forward by a predetermined amount when it is determined that the occupant releases the webbing wearing state and gets off the vehicle. Thereby, the winding urging force of the spring applied to the winding shaft is increased, and the webbing is wound up on the winding shaft. Thus, since the motor is operated (rotated) after it is determined by the control means that the occupant has got off, it is possible to prevent or suppress discomfort to the occupant due to the operating sound of the motor.

  The webbing take-up device according to a fifth aspect of the present invention is the webbing take-up device according to the fourth aspect, wherein the control means passes a time required for the occupant to get off after the occupant is released from the webbing wearing state. It is characterized in that it is determined that the occupant has got off at the time.

  In the webbing take-up device according to the fifth aspect, the control means determines whether or not the occupant has got off the vehicle based on the elapsed time from the release of the webbing wearing state of the occupant. Therefore, the configuration is simple.

  A three-point seat belt device according to a sixth aspect of the invention is disposed on the opposite side of the vehicle seat from the side where the occupant gets off, and the base end portion of the webbing is locked to the take-up shaft. In addition, the webbing retractor according to any one of claims 1 to 5, wherein a front end portion of the webbing is locked to a side opposite to the dismounting side, and the disengaging side with respect to the seat. And a buckle device that holds a tongue plate through which the intermediate portion of the webbing is inserted.

  In the three-point seat belt device according to claim 6, the webbing retractor according to any one of claims 1 to 5 is disposed on the opposite side of the vehicle seat from the side where the occupant gets off. The buckle device for locking the tongue plate is disposed on the side where the occupant gets off the vehicle seat. Therefore, when the occupant releases the webbing state, the pulled-out webbing remains on the opposite side (webbing take-up device side) from which the occupant gets off, so that the pulled-out webbing It can prevent obstruction.

  As described above, in the webbing retractor and the three-point seat belt device according to the present invention, the function of the tension reducer for reducing or eliminating excessive pressure feeling when the webbing is mounted, and the webbing retractor When performing the mounting assist function with a motor, the timing for operating the motor can be controlled with a simple configuration.

<First Embodiment>
FIG. 1 is an exploded perspective view showing a configuration of a webbing take-up device 10 according to a first embodiment of the present invention. FIG. 2 is a sectional view showing the configuration of peripheral members including a spring holding box 24 that is a component of the webbing take-up device 10. Further, FIG. 3 shows a cross-sectional view of a configuration of peripheral members including a winding shaft 12 which is a component of the webbing winding device 10.

  The webbing take-up device 10 includes a take-up shaft 12. The take-up shaft 12 is rotatably supported by the frame 14, and the base end portion of the webbing 13 (see FIG. 3) is locked. The webbing 13 is taken up or pulled out by the rotation of the take-up shaft 12. Is done.

  An adapter 16 is connected to one end of the winding shaft 12 outside the frame 14, and a cover 18 and a box-shaped base 20 are attached to the side of the frame 14. The adapter 16 passes through the base 20 and always rotates integrally with the winding shaft 12.

  In the base 20, a mainspring 22 as a spring and a spring holding box 24 are arranged. The main spring 22 has an inner end locked to the adapter 16 and an outer end locked to a spring holding box 24 to urge the winding shaft 12 in the webbing winding direction. On the other hand, the spring holding box 24 that locks the outer end portion of the mainspring spring 22 can be rotated coaxially and forward and backward with the adapter 16 in a state in which the mainspring spring 22 is accommodated therein (relative to the adapter 16). ) It is supported by the base 20. For this reason, when the spring holding box 24 rotates in the forward and reverse directions, the locking position of the outer end portion of the mainspring spring 22, that is, the setting position of the mainspring spring 22 can be changed. The winding biasing force applied to the shaft 12 can be adjusted (changed).

  In this case, when the spring holding box 24 is rotated in the forward direction (the direction of arrow A in FIG. 1), the winding biasing force applied to the winding shaft 12 by the mainspring spring 22 increases, and the spring holding box 24 is moved in the reverse direction. When rotated in the direction of arrow B in FIG. 1, the winding biasing force applied to the winding shaft 12 by the mainspring spring 22 is reduced.

  On the outer peripheral edge of the spring holding box 24, a worm tooth portion 26 is formed to constitute a so-called worm wheel. A worm gear 30 is engaged with the worm tooth portion 26 of the spring holding box 24. The worm gear 30 is supported at one end of a shaft 32, and a spur gear 34 is attached to the other end of the shaft 32. The spur gear 34 meshes with a spur gear 38 attached to the output shaft 35 of the motor 36.

  The motor 36 is fixed to the base 20 by a stay 37, and the spur gear 34, the spur gear 38 and the like are covered with a cover 39. Thus, when the motor 36 is driven, the driving force is transmitted through the spur gear 38, the spur gear 34, the worm gear 30, and the worm tooth portion 26, and the spring holding box 24 is rotated.

  In this case, when the output shaft 35 of the motor 36 is rotated forward, the spring holding box 24 is rotated in the forward direction, and when the output shaft 35 of the motor 36 is reversed, the spring holding box 24 is rotated in the reverse direction. Yes.

  On the other hand, as shown in FIG. 3, the webbing take-up device 10 includes a pressing lever 40 disposed in the vicinity of the outer side in the radial direction of the take-up shaft 12. The pressing lever 40 has a support shaft portion 42 formed on the base end side thereof supported by the frame 14 so as to be rotatable, and moves toward and away from the winding shaft 12 by rotating around the support shaft portion 42. It is possible. The pressing lever 40 is always urged toward the winding shaft 12 by an urging member (not shown).

  A stopper 44 is disposed on the distal end side of the pressing lever 40. When the amount of webbing 13 wound onto the winding shaft 12 exceeds a predetermined value (including the state in which the webbing 13 is fully stored in the webbing winding device 10), the pressing lever 40 is used. Is in contact with a winding portion (outer peripheral portion) to the winding shaft 12. In this state, a predetermined drag is applied to the drawing of the webbing 13 (the rotation of the winding shaft 12).

  In addition, when the winding amount of the webbing 13 to the winding shaft 12 is less than a predetermined value, the pressing lever 40 makes its tip end abut against the stopper 44 so that the pressing lever 40 rotates to the winding shaft 12 side. It is regulated and is separated from the winding portion of the webbing 13.

  On the other hand, as shown in FIG. 1, the webbing take-up device 10 includes a driver 46 and an ECU 48 that constitute control means. The ECU 48 stores a drive control program according to the first embodiment of the present invention. In addition, the motor 36 is electrically connected to a battery 50 mounted on the vehicle via a driver 46, and the current from the battery 50 flows to the motor 36 via the driver 46, so that the motor 36 has a driving force. Thus, the output shaft 35 is configured to rotate forward or reverse. The driver 46 is connected to the ECU 48, and the ECU 48 controls the presence / absence of power supply to the motor 36 via the driver 46 and the direction of the supply current. In addition, in this case, the ECU 48 can detect the rotation amount of the output shaft 35 based on the energization time of the motor 36 and the like.

  The ECU 48 is connected to a buckle switch 52 as a control means for detecting whether or not a tongue plate provided on the webbing 13 is connected to a buckle device (both not shown). When the tongue plate is connected to the buckle device, the buckle switch 52 outputs an H level signal indicating the switch ON state to the ECU 48, and when the tongue plate is released from the buckle device, the switch OFF state. Is output to the ECU 48.

  Next, the operation of the first embodiment of the present invention will be described with reference to the flowchart of the drive control program shown in FIG.

  In the webbing take-up device 10 configured as described above, when the tongue plate provided on the webbing 13 is released from the buckle device and the buckle switch 52 is turned off (step 54), an L level signal is input to the ECU 48. As a result, the ECU 48 determines that the webbing 13 has been removed from the occupant's body when the occupant gets off, and the routine proceeds to step 56.

  In step 56, the ECU 48 and the driver 46 cause the output shaft 35 of the motor 36 to rotate normally. Thereby, the forward rotation of the output shaft 35 is transmitted through the spur gear 38, the spur gear 34, the worm gear 30, and the worm tooth portion 26, and the spring holding box 24 is rotated in the forward direction. When the process in step 56 is completed, the process proceeds to next step 58.

  In step 58, the ECU 48 determines whether or not the output shaft 35 of the motor 36 has rotated forward by a predetermined amount. That is, the ECU 48 determines whether the spring holding box 24 has rotated a predetermined amount in the forward direction and the winding biasing force applied to the winding shaft 12 by the mainspring spring 22 has increased to a predetermined value (torque up). The The process proceeds to the next step 60 only when this determination is affirmed.

  In step 60, the ECU 48 and the driver 46 stop the output shaft 35 of the motor 36. In this state, since the winding biasing force applied to the winding shaft 12 by the mainspring 22 is increased as described above, the winding shaft 12 is rotated in the winding direction by the winding biasing force. The webbing 13 is wound around the winding shaft 12 (winding assist function). At this time, when the winding amount of the webbing 13 to the winding shaft 12 becomes a predetermined value or more, the pressing lever 40 comes into contact with the outer periphery of the winding portion of the webbing 13 to the winding shaft 12, and the pressing lever 40 is biased. Against the winding shaft 12, it is rotated to the opposite side. As a result, a predetermined drag is applied to the withdrawal of the webbing 13 (rotation of the winding shaft 12) by the pressing lever 40. When the processing in step 60 is completed, the process proceeds to next step 62.

  In step 62, whether or not a predetermined time has elapsed since the output shaft 35 of the motor 36 was stopped, that is, whether or not the webbing 13 has been fully stored in the webbing take-up device 10 by the increased take-up biasing force. Is determined by the ECU 48. Only when this determination is affirmed, the routine proceeds to the next step 64.

  In step 64, the ECU 48 and the driver 46 reversely rotate the output shaft 35 of the motor 36. Thus, the reverse rotation of the output shaft 35 is transmitted through the spur gear 38, the spur gear 34, the worm gear 30, and the worm tooth portion 26, and the spring holding box 24 is rotated in the reverse direction. When the process in step 64 is completed, the process proceeds to next step 66.

  In step 66, the ECU 48 determines whether or not the output shaft 35 of the motor 36 has been reversed by a predetermined amount. That is, the ECU 48 determines whether the spring holding box 24 is rotated by a predetermined amount in the reverse direction and the winding biasing force applied to the winding shaft 12 by the mainspring spring 22 is reduced to a predetermined value (torque down). The Only when this determination is affirmed, the routine proceeds to the next step 68.

  In step 68, the ECU 48 and the driver 46 stop the output shaft 35 of the motor 36. When the processing in step 68 is finished, the drive control program according to the first embodiment of the present invention is finished.

  In this state, as described above, the winding biasing force applied to the winding shaft 12 by the mainspring 22 is reduced (torque down). Therefore, when the passenger gets on and pulls out the webbing 13 again, The webbing 13 can be easily pulled out and attached with a light force (drawing assist function). Further, it is possible to prevent the passenger from being overstressed by the webbing 13 in the mounted state (function of tension reducer).

  However, in the state where the webbing 13 is fully stored in the webbing take-up device 10 as described above (when the amount of the webbing 13 taken up by the take-up shaft 12 is a predetermined value or more), the webbing 13 is moved to the take-up shaft 12. Since the pressing lever 40 is in contact with the outer periphery of the winding portion of the webbing 13, a predetermined drag is applied to the withdrawal of the webbing 13 until the winding amount of the webbing 13 to the winding shaft 12 decreases below a predetermined value. The Here, for example, when the webbing retractor 10 is applied to a passenger seat or a rear seat, the vehicle travels in a state where the webbing 13 is fully stored (that is, the torque-down state). Can be considered. Even in such a case, as described above, since a predetermined drag is applied to the pulling out of the webbing 13, it is possible to prevent the webbing 13 from being unnecessarily extended from the webbing take-up device 10 due to the vibration of the running vehicle. .

  Note that the drag increases the pulling force of the webbing 13, but at the beginning of pulling out the webbing 13, a slightly higher pulling force provides a sense of moderation and improves the quality.

As described above, in the webbing retractor 10 according to the first embodiment of the present invention, when the motor 36 performs the function of the tension reducer and the assisting function for winding and drawing the webbing 13, the ECU 48 and the driver 46 detects the timing of operating (rotating) the motor 36 only by a signal from the buckle switch 52 and an elapsed time since the detection of the signal, for example, a door for detecting the occupant's riding operation No switch or seat switch is required, and the configuration is extremely simple.
<Second Embodiment>
Next, a second embodiment of the present invention will be described. In addition, about the structure and operation | movement fundamentally the same as the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is attached | subjected and the description is abbreviate | omitted.

  FIG. 5 is a perspective view showing a configuration of a vehicle three-point seat belt device 70 according to a second embodiment of the present invention.

  The three-point seat belt device 70 includes a webbing take-up device 74 that is disposed on the side (vehicle width direction inner side) opposite to the side (vehicle door side) from which the occupant gets off the vehicle seat 72. ing. The webbing take-up device 74 has basically the same configuration as the webbing take-up device 10 according to the first embodiment described above. However, as shown in FIG. 1, the webbing take-up device 74 includes an ECU 76 different from the ECU 48 according to the first embodiment, and the ECU 76 includes the second embodiment of the present invention. Such a drive control program is stored.

  An anchor plate 78 is disposed on the opposite side of the seat 72 from the side where the occupant gets off (the inner side in the vehicle width direction, the same side as the webbing take-up device 74). It is locked. An intermediate portion of the webbing 13 is wound around a shoulder anchor 80 disposed above the webbing take-up device 74 and is inserted through a tongue plate 82. Further, a buckle device 84 that holds the tongue plate 82 is disposed on the side where the occupant gets off the seat 72 (vehicle door side).

  Here, FIG. 6 shows a flowchart of the drive control program according to the second embodiment of the present invention. In addition, about the process similar to the drive control program which concerns on the said 1st Embodiment, the same number as the step number which concerns on the said 1st Embodiment is attached | subjected, and the description is abbreviate | omitted.

  As shown in FIG. 6, the drive control program according to the second embodiment of the present invention is basically the same as the drive control program according to the first embodiment. In between, step 86 is provided.

  In step 86, the ECU 76 determines whether or not a predetermined time (a time required for the occupant to get off, for example, one minute) has elapsed since the detection of the off state of the buckle switch 52 in step 54. Only when this determination is affirmed, the routine proceeds to the next step 56 where the output shaft 35 of the motor 36 is rotated forward. That is, in the webbing retractor according to the second embodiment, the ECU 76 detects the off state of the buckle switch 52 and activates the motor 36 when it is determined that the occupant has got off the vehicle. As described above, since the motor 36 is operated after the ECU 76 determines that the occupant has got off, it is possible to prevent or suppress discomfort to the occupant due to the operating sound of the motor 36.

  Here, since the webbing 13 released from the mounting state as described above is wound around the take-up shaft 12 after the occupant gets off, the webbing 13 remains pulled out until the occupant gets off. However, in the three-point seat belt device 70 according to the second embodiment, the webbing retractor 74 is disposed on the opposite side of the vehicle seat 72 from the side where the occupant gets off, and the tongue plate The buckle device 84 that holds 82 is disposed on the side where the occupant gets out of the seat 72 of the vehicle. Accordingly, the webbing 13 that has been pulled out remains on the side opposite to the side from which the occupant gets off (on the webbing take-up device 74 side), so that the webbing 13 can be prevented from hindering the occupant from getting off.

  As described above, the webbing take-up device 74 according to the second embodiment of the present invention has the same effects as the webbing take-up device 10 according to the first embodiment. And it can prevent or suppress giving a passenger discomfort with the operation sound of motor 36. Moreover, in the seatbelt apparatus 70 which concerns on the 2nd Embodiment of this invention, it can prevent that the webbing 13 withdraw | drawn out obstructs a passenger | crew's getting off.

In the second embodiment, the webbing retractor 74 is disposed on the opposite side of the vehicle seat 72 from the side where the occupant gets off, and the buckle device 84 is disposed on the exit side. Although described based on the three-point seat belt device 70, the present invention is not limited to this, and the webbing take-up device 74 is applied to a normal three-point seat belt device (a type in which the webbing take-up device is disposed on the alighting side). You may comprise. Even in this case, it is possible to control the timing of operating the motor 36 with a simple configuration and to prevent or suppress the passenger from feeling uncomfortable due to the operation sound of the motor 36. This also applies to the following embodiments.
<Third Embodiment>
Next, a third embodiment of the present invention will be described. In addition, about the structure and operation | movement fundamentally the same as the said 1st Embodiment and 2nd Embodiment, the same code | symbol as the said 1st Embodiment and 2nd Embodiment is attached | subjected and the description is given. Is omitted.

  FIG. 7 is an exploded perspective view showing the configuration of a webbing take-up device 90 according to the third embodiment of the present invention.

  The webbing take-up device 90 constitutes a vehicle seat belt device having the same configuration as the vehicle seat belt device 70 according to the second embodiment described above, and the webbing take-up device according to the first embodiment. The webbing take-up device 74 and the webbing take-up device 74 according to the second embodiment are basically the same in configuration. However, the webbing take-up device 90 includes an ECU 92 different from the ECU 48 according to the first embodiment and the ECU 76 according to the second embodiment. The ECU 92 includes a third embodiment of the present invention. A drive control program according to the embodiment is stored.

  The ECU 92 is connected to a door switch 94 that constitutes a control means. The door switch 94 outputs an H level signal indicating the switch on state to the ECU 92 when the vehicle door is closed, and outputs an L level signal indicating the switch off state when the vehicle door is open. Output to the ECU 92.

  Further, the ECU 92 is connected to a seat switch 96 that constitutes a control means. The seat switch 96 outputs an H level signal indicating the ON state of the switch to the ECU 92 when the occupant is seated in the vehicle seat, and sets the switch OFF state when the occupant is not seated in the vehicle seat. An L level signal is output to the ECU 92.

  Here, FIG. 8 shows a flowchart of the drive control program according to the third embodiment of the present invention. In addition, about the process similar to the drive control program which concerns on the said 1st Embodiment, the same number as the step number which concerns on the said 1st Embodiment is attached | subjected, and the description is abbreviate | omitted.

  As shown in FIG. 8, the drive control program according to the third embodiment of the present invention is basically the same as the drive control program according to the first embodiment. Between step 98, step 98 and step 100 are provided.

  In step 98, after detecting the off state of the buckle switch 52 in step 54, the ECU 92 determines whether or not the seat switch 96 is in an off state (a state in which no occupant is seated). Only when the determination at step 98 is affirmative, the routine proceeds to the next step 100.

  In step 100, the ECU 92 determines whether or not the door switch 94 is in an on state (a state in which the door is closed). Only when the determination at step 100 is affirmative, the routine proceeds to the next step 56 where the output shaft 35 of the motor 36 is rotated forward.

  That is, in the webbing retractor 90 according to the third embodiment of the present invention, the ECU 92 determines that the occupant has got off based on the seat switch 96 being in the off state and the door switch 94 being in the on state. It is a configuration. Therefore, the ECU 92 can more reliably detect whether the occupant has got off the vehicle. When it is determined that the occupant has got off the vehicle, the output shaft 35 of the motor 36 is rotated forward in step 56. As described above, since the motor 36 is operated in a state where there is a high possibility that the occupant has got off the vehicle, it is possible to prevent or suppress discomfort to the occupant due to the operation sound of the motor 36.

  As described above, the webbing take-up device 90 according to the third embodiment of the present invention also has basically the same effects as the webbing take-up device 74 according to the second embodiment.

  In the third embodiment, the ECU 92 is configured to detect whether or not the occupant gets out of the vehicle using the door switch 94 and the seat switch 96, but the present invention is not limited to this. For example, there is a high possibility that an occupant is present in the vehicle compartment immediately after the ignition switch of the vehicle is turned off. Therefore, if the ignition switch is connected to the ECU 92, it is possible to make the ECU 92 determine whether or not the occupant has got off the vehicle based on the elapsed time from when the ignition switch is turned off. Further, it is possible to make the ECU 92 determine whether or not the occupant has got off the vehicle using switches or the like operated by the occupant.

It is a disassembled perspective view which shows the structure of the webbing winding apparatus which concerns on the 1st Embodiment of this invention, and the webbing winding apparatus which concerns on the 2nd Embodiment of this invention. It is side surface sectional drawing which shows the structure of the peripheral member containing the spring holding box which is a structural member of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the peripheral member containing the winding shaft which is a structural member of the webbing winding apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the control procedure of the control means of the webbing winding device concerning a 1st embodiment of the present invention. It is a perspective view which shows the structure of the three-point seatbelt apparatus which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the control procedure of the control means of the webbing winding device concerning a 2nd embodiment of the present invention. It is a disassembled perspective view which shows the structure of the webbing winding apparatus which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the control procedure of the control means of the webbing winding device concerning a 3rd embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Webbing winding device 12 Winding shaft 13 Webbing 22 Spring spring (spring)
24 Spring holding box 35 Output shaft 36 Motor 46 Driver (control means)
48 ECU (control means)
52 Buckle switch (control means)
70 three-point seat belt device 72 seat 74 webbing take-up device 82 tongue plate 84 buckle device 76 ECU (control means)
90 Webbing take-up device 92 ECU (control means)
94 Door switch (control means)
96 Seat switch (control means)

Claims (6)

A spring that is connected at one end to a winding shaft from which the webbing is wound and pulled out, and applies a winding biasing force to the winding shaft;
The other end of the spring is locked and rotatably provided, and the winding biasing force by the spring is increased by rotating in the forward direction, and the winding by the spring is rotated by rotating in the reverse direction. A spring holding box that reduces the biasing force;
An output shaft connected to the spring holding box; and a motor that rotates the spring holding box in the forward direction by forward rotation of the output shaft, and rotates the spring holding box in the reverse direction by reverse rotation of the output shaft;
Control means for causing the output shaft of the motor to rotate forward by a predetermined amount when the occupant releases the webbing wearing state, and to reverse the output shaft of the motor by a predetermined amount after a predetermined time;
A webbing take-up device comprising:   2. The apparatus according to claim 1, further comprising a drag applying unit that applies a predetermined drag to the webbing drawer when the webbing amount of the webbing on the winding shaft exceeds a predetermined value. Webbing take-up device. The drag applying means is
It is rotatably provided in the vicinity of the outer side in the radial direction of the take-up shaft, and is always urged toward the take-up shaft side. A pressing lever that comes into contact with the winding portion of the shaft;
A stopper that restricts the rotation of the pressing lever toward the winding shaft by contacting the pressing lever when the winding amount is less than a predetermined value;
The webbing retractor according to claim 2, further comprising:   The timing at which the control means causes the output shaft of the motor to rotate forward by the predetermined amount is a time when the control means determines that the occupant has got off the vehicle. The webbing take-up device according to any one of the preceding claims.   5. The webbing winding according to claim 4, wherein the control means determines that the occupant has got off when a time required for the occupant to get off has elapsed after the occupant has released the webbing wearing state. Taking device. The webbing is disposed on the opposite side of the vehicle seat from the side where the occupant gets off, the base end of the webbing is locked to the take-up shaft, and the front end of the webbing is on the side opposite to the unloading side The webbing take-up device according to any one of claims 1 to 5, which is locked to
A buckle device that is disposed on the dismounting side with respect to the seat and holds a tongue plate through which an intermediate portion of the webbing is inserted;
A three-point seat belt device.

Images