JP2014231346A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device which allows a belt reacher to operate according to an intention of an occupant such as a driver.SOLUTION: A seat belt device 10 includes a webbing reel 15, an electric motor 31, a clutch member 65, a belt reacher 17, a door opening and closing detection part 29, an occupant detection part 30 and a motor control part 28. Therein, when, for example, a contact to a lateral surface 19s of a seat 19 is not detected at a predetermined time by the occupant detection part 30, the motor control part 28 controls the electric motor 31 such that the clutch member 65 is moved from a connected position to cut-off position. Further, the seat belt device 10 can provide a temperature detection part 25 and, when temperature of the door opening and closing detection part 29 is low and, for example, the contact to the lateral surface 19s of the seat 19 is not detected at a predetermined time, the motor control part 28 can control the electric motor 31 such that the clutch member 65 is moved from the connected position to the cut-off position.

Description

  The present invention relates to a seat belt device including a belt reacher that can rotate so as to fall forward together with a part of a webbing, for example, when a vehicle door is closed.

  For example, FIG. 1A of Patent Document 1 discloses a seat belt device 100 including a belt reacher 170. Further, according to the description of paragraphs [0049] and [0057] of Patent Document 1 and the contents of FIG. 11, when the vehicle door is opened, the retractor 120 is driven to rotate forward, the webbing 110 is wound up, and the belt reacher 170 is Stand upright in the retracted position. On the other hand, according to the description in paragraphs [0054] and [0055] of Patent Document 1 and the contents of FIGS. 5B, 6B, and 11, the retractor 120 is driven in reverse when the vehicle door is closed, The return spring 182 biases the belt reacher 170 in the forward direction, and the belt reacher 170 stays in a forward leaning posture by the first stopper 200 or the second stopper 210 depending on the position of the seat 150.

  Thus, since the belt reacher 170 of patent document 1 moves to a storage position when the door of a vehicle opens, the belt reacher 170 does not get in the way, for example, when a driver gets into the vehicle. On the other hand, since the belt reacher 170 falls forward when the vehicle door is closed, the driver can easily hold the webbing 110 or the tongue plate 140, and accordingly, the tongue plate 140 can be easily inserted or fixed to the buckle 160.

  For example, FIG. 1A of Patent Document 2 discloses a seat belt wearing assistance device 10 including an arm member 11. Further, according to the description in paragraphs [0024] and [0037] of Patent Document 2 and the contents of FIG. 1B, when the vehicle door is closed and an occupant is seated, the arm member 11 is located above the seat back 2. Therefore, the occupant can easily hold the webbing 4 or the tongue plate 5, and thus can easily insert or fix the tongue plate 5 to the buckle 6.

  However, according to the description in paragraph [0038] of Patent Document 2 and the contents of FIG. 5A, seating determination is turned on / off within the waiting time T a predetermined number of times, and a passenger such as a child is placed on the rear seat 1. When a seating abnormality such as jumping is detected, the arm member 11 does not extend and continues to stand by at the top of the seat back 2. Thereby, it can avoid that a child collides with the arm member 11 (paragraph [0005] of patent document 2).

JP 2011-84081 A JP 2012-20640 A

  However, a front seat such as a driver's seat or a passenger seat generally includes an operation unit capable of adjusting a reclining angle, a seat position, and the like. Such an operation unit is, for example, the second part of FIG. Similar to the stopper 210 and the like, it is provided on the side surface of the sheet 150. Accordingly, when the occupant operates the operation section after the occupant gets into the vehicle and closes the door, the belt reacher 170 that falls forward is obstructed by such an operation.

  In other words, even if a seating sensor such as the seating sensor 31 of Patent Document 2 is provided on the seat 150 of Patent Document 1 according to the teaching in paragraph [0032] of Patent Document 2, the reclining angle, the seat position, etc. When the adjustment is performed, the seating sensor does not detect a seating abnormality, and if the occupant operates the operation unit after entering the vehicle and closing the door, the belt reacher 170 falls forward. That is, even when no seating abnormality is detected, the occupant feels uncomfortable when the belt reacher 170 falls forward.

  Further, the door opening / closing detection unit 230 in FIG. 7 of Patent Document 1 may not operate or break down at low temperatures. In this case, the belt leecher 170 of Patent Document 1 cannot operate properly according to the opening / closing of the door of the vehicle.

  One object of the present invention is to provide a seat belt device in which a belt reacher can operate according to the intention of an occupant such as a driver. 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.

A first aspect according to the present invention is a webbing reel capable of winding a webbing;
An electric motor coupled to the webbing reel via a transmission mechanism;
A clutch member movable to a contact position for keeping the electric motor and the webbing reel in contact or a disconnect position for keeping the electric motor and webbing reel in a disconnected state;
A belt reacher that can be rotated forward of the vehicle by an urging member, and can be rotated to the retracted position behind the vehicle by winding the webbing;
A door opening / closing detection unit for detecting opening / closing of the door of the vehicle;
An occupant detection unit that detects contact by the occupant to the side surface of the seat part;
A motor control unit for controlling the electric motor;
With
When the contact with the side surface of the seat portion is not detected by the occupant detection unit at a predetermined time, the motor control unit controls the electric motor so that the clutch member moves from the contact position to the disengagement position. The present invention relates to a seat belt device characterized by controlling.

  In the first aspect, for example, when contact with the side surface of the seat is not detected by the occupant detection unit at a predetermined time, the clutch member moves from the contact position to the disengagement position under the control of the motor control unit. By such control, the belt reacher can be rotated forward of the vehicle by the biasing member only when there is no contact by the occupant at a predetermined time. In other words, if there is contact by the occupant at a predetermined time, the clutch member stays in the contact position and the position of the belt reacher is maintained, so the belt reacher is the occupant when the occupant adjusts the reclining angle, seat position, etc. It is hard to get in the way of operation. Thus, a seat belt device is provided in which the belt reacher can operate according to the intention of the occupant.

In a second aspect according to the present invention, in the first aspect,
The predetermined time is a time when a predetermined time has elapsed since the change from the open state to the closed state of the door is detected by the door opening / closing detection unit in a state where the belt reacher is rotated to the storage position. May be.

  In the second aspect, the predetermined time is a time when a predetermined time has elapsed since the change of the door from the open state to the closed state was detected in a state where the belt reacher was rotated to the storage position. Therefore, the position of the belt reacher is held at the storage position for a period until a predetermined time elapses after the change from the open state to the closed state of the door is detected. In other words, after the door is closed, when the occupant adjusts the reclining angle, the seat position, etc., the position of the belt reacher is held at an ideal storage position so as not to obstruct the occupant's operation.

According to the third aspect of the present invention, in the first or second aspect,
A temperature detection unit that detects a temperature of the door opening / closing detection unit;
When the temperature is lower than a predetermined value, the predetermined time is the state where the belt reacher is rotated to the storage position, regardless of the detection result of the door opening / closing detection unit, to the side surface of the seat unit. It may be set when a predetermined time has elapsed since the contact was detected by the door opening / closing detection unit.

  In the third aspect, when the temperature of the door opening / closing detection unit decreases, the motor control unit causes the occupant detection unit to contact the side surface of the seat at a predetermined time regardless of the detection result of the door opening / closing detection unit. It can be determined whether or not it has been detected. Here, the predetermined time is set to a time when a predetermined time has elapsed since the contact with the side surface of the sheet was detected. Accordingly, when contact with the side surface of the seat is detected and no contact is detected at a predetermined time, the belt reacher can be rotated forward of the vehicle by the biasing member. In other words, when the occupant gets into the vehicle, for example, the hand of the occupant touches the side of the seat, and if such contact is no longer detected, the completion of the occupant's boarding can be estimated. Can start rotating the vehicle forward.

  Thus, even when the door opening / closing detection unit does not operate at low temperatures, the movement of the occupant is estimated, and therefore the belt reacher can operate according to the occupant's intention.

According to a fourth aspect of the present invention, there is provided a webbing reel capable of winding the webbing,
An electric motor coupled to the webbing reel via a transmission mechanism;
A clutch member movable to a contact position for keeping the electric motor and the webbing reel in contact or a disconnect position for keeping the electric motor and webbing reel in a disconnected state;
A belt reacher that can be rotated forward of the vehicle by an urging member, and can be rotated to the retracted position behind the vehicle by winding the webbing;
A door opening / closing detection unit for detecting opening / closing of the door of the vehicle;
A temperature detection unit for detecting the temperature of the door opening / closing detection unit;
A motor control unit for controlling the electric motor;
With
When the temperature is lower than a predetermined value, the motor control unit controls the electric motor so that the belt reacher rotates to the retracted position regardless of a detection result of the door opening / closing detection unit. It relates to the seat belt device.

  In the fourth aspect, when the temperature of the door opening / closing detection unit decreases, the belt reacher rotates to the storage position by the control of the motor control unit regardless of the detection result of the door opening / closing detection unit. Since the belt reacher is disposed at the retracted position when the door opening / closing detection unit does not operate at a low temperature, the belt reacher does not get in the way when the occupant gets into the vehicle. As a result, the belt reacher can operate according to the minimum intention or basic intention of the occupant.

According to the fifth aspect of the present invention, in the fourth aspect,
An occupant detection unit that detects contact by the occupant to the seat part may be further provided.
When the contact with the seat part is not detected by the occupant detection part at a predetermined time, the motor control part controls the electric motor so that the clutch member moves from the contact position to the disengagement position. Well,
When the temperature is lower than a predetermined value, the predetermined time is the state where the belt reacher is rotated to the retracted position, and the contact with the seat is not related to the detection result of the door opening / closing detection unit. It may be the time when a predetermined time has elapsed since the detection by the occupant detection unit.

  In the fifth embodiment, when the temperature of the door opening / closing detection unit decreases, the motor control unit detects that the contact with the seat, the seat back, etc. is detected at a predetermined time regardless of the detection result of the door opening / closing detection unit. It can be determined whether it is not detected by the unit. Here, the predetermined time is set to a time when a predetermined time has elapsed since the contact with the seat, the seat back, or the like was detected. Accordingly, when contact with a seat, a seat back or the like is detected and the contact is not detected at a predetermined time, the belt reacher can be rotated forward of the vehicle by the biasing member. In other words, when the occupant gets into the vehicle, for example, the occupant's hand touches the side of the seat, or when the occupant gets into the vehicle, the occupant's, for example, the back contacts the front of the seat back. If it is lost, the completion of the occupant's boarding can be estimated, so that the belt reacher can start rotating the vehicle forward.

  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 storing position of the belt reacher of FIG. 1 is shown. The disassembled perspective view of the winding apparatus of FIG. 1 is shown. An explanatory view of the motor drive mechanism of FIG. 3 is shown. The explanatory view of the contact state of the clutch mechanism of Drawing 3 is shown. FIG. 4 is an explanatory diagram of a disengaged state of the clutch mechanism of FIG. 3. 2 is a flowchart illustrating an operation example of the control device in FIG. 1.

  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. In the example of FIG. 1 (perspective view and block diagram), a vehicle seat belt device 10 includes, for example, a winding device 14 (retractor) provided on a vehicle body 11, a webbing 16 wound around the winding device 14, and a webbing. 16, a tongue plate 23 inserted into the tongue plate 16, a buckle 24 that engages with the tongue plate 23, and a control device 20 that controls the winding of the webbing 16. However, the seat belt device 10 may not include all the components such as the winding device 14, the webbing 16, the tongue plate 23, the buckle 24, and the control device 20, or a part of each of these components. In addition, other components described below can also be provided. In other words, the example of FIG. 1 merely illustrates an exemplary embodiment, and at least one component of the seat belt device 10 may be selected or determined in accordance with at least one object of the present invention. it can.

  In the example of FIG. 1, the winding device 14 is provided in a lower portion 12 a of a pillar 12 such as a B pillar of the vehicle body 11. The winding device 14 can include, for example, a motor drive mechanism 35 as a mechanism for winding (withdrawing) the webbing 16. One end side 16a of the webbing 16 is wound around the webbing reel 15 of the winding device 14, while the other end side 16b of the webbing 16 drawn from the winding device 14 is fixed to the belt reacher 17, and For example, it is provided on the floor surface of the vehicle body 11 via the belt reacher 17. The webbing 16 is bent by a through anchor 13 provided on the top of the pillar 12.

  In the example of FIG. 1, the tongue plate 23 is a member that is movably inserted into the webbing 16 and detachably engages with the buckle 24. The buckle 24 is also provided on the floor surface of the vehicle body 11, for example. The buckle 24 can incorporate, for example, an engaging portion (not shown) for engaging the tongue plate 23, and an unlock button (not shown) for releasing the lock between the engaging portion and the tongue plate 23. )). When an occupant such as a driver presses the lock release button of the buckle 24, the lock between the engaging portion and the tongue plate 23 is released.

  In the example of FIG. 1, the seat belt attachment detection unit 27 is configured by, for example, a buckle switch, and the buckle switch is provided, for example, at the buckle 24 or the engagement unit. A seat belt wearing detection unit 27 such as a buckle switch detects whether or not there is a lock between the buckle 24 (engagement unit) and the tongue plate 23, that is, whether or not the occupant is wearing the webbing 16 or the seat belt. . When the occupant wears the seat belt and the tongue plate 23 is fixed to the buckle 24, for example, the buckle switch is turned on, and a signal indicating the detection result in the seat belt wearing detection unit 27 is input or transmitted to the control device 20. .

  In the example of FIG. 1, the control device 20 includes a motor control unit 28 that inputs a signal from the seat belt wearing detection unit 27 and a signal from the door opening / closing detection unit 29. The motor control unit 28 can output a control signal to the motor drive unit 32 based on these signals, while the motor drive unit 32 drives the electric motor 31 of the winding device 14 based on this control signal. A drive signal can be generated. The door opening / closing detection unit 29 configured by, for example, a door switch detects the opening / closing of a vehicle door (not shown). For example, when the driver closes the door on the vehicle side, the door switch is turned ON, for example. A signal representing the detection result of the detection unit 29 is input to the control device 20 or the motor control unit 28.

  In the example of FIG. 1, the control device 20 can further include, for example, an occupant detection unit 30, and the occupant detection unit 30 can detect contact of the occupant with the seat 19, for example. A signal representing the detection result of the occupant detection unit 30 is input to the motor control unit 28, and the motor control unit 28 can generate a control signal in consideration of the signal from the occupant detection unit 30. Here, the passenger | crew detection part 30 is comprised, for example by the electrostatic capacitance sensor, and an electrostatic capacitance sensor can detect whether the passenger | crew's hand is touching the electrostatic capacitance sensor.

  In the example of FIG. 1, the occupant detection unit 30 configured by, for example, a capacitance sensor is provided on, for example, the side surface 19 s of the seat 19. Specifically, the occupant detection unit 30 is provided not on the side surface on the buckle 24 side of the seat 19 but on the side surface 19s on the belt reacher 17 side, and when the occupant operates the reclining lever 22, the occupant detection unit 30 The contact by the passenger to the side surface 19s of the seat 19 is detected. Note that when the occupant operates the operation unit such as the reclining lever 22, the belt reacher 170 that falls forwardly interferes with such an operation. Therefore, the control device 20 can control the electric motor 31 so that the belt reacher 170 does not interfere with the operation of the occupant. The detailed control method of the electric motor 31 according to the detection result in the passenger | crew detection part 30 is mentioned later (refer FIG. 7).

  In the example of FIG. 1, the control device 20 can further include, for example, a temperature detection unit 25, and the temperature detection unit 25 can detect the temperature of the door opening / closing detection unit 29. A signal representing the detection result of the temperature detection unit 25 is input to the motor control unit 28, and the motor control unit 28 can generate a control signal in consideration of the signal from the temperature detection unit 25. Here, the temperature detection part 25 is comprised, for example with a thermistor. The temperature detection unit 25 is disposed, for example, in the vicinity of the door opening / closing detection unit 29 or the door, but the temperature detection unit 25 may be incorporated in the door opening / closing detection unit 29. Since the door opening / closing detection unit 29 may not operate at a low temperature, the control device 20 causes the electric motor 31 to be activated regardless of the detection result of the door opening / closing detection unit 29 when the temperature of the door opening / closing detection unit 29 decreases. Can be controlled. A detailed control method of the electric motor 31 according to the detection result of the temperature detection unit 25 will be described later (see FIG. 7).

  In the example of FIG. 1, the control device 20 can further include, for example, a tension detection unit 26, and the tension detection unit 26 can obtain the tension of the webbing 16. A signal representing the detection result in the tension detection unit 26 is input to the motor control unit 28, and the motor control unit 28 can generate a control signal in consideration of the signal from the tension detection unit 26. Here, the tension detection unit 26 is configured by, for example, a current sensor, and the current sensor can detect a drive current when the webbing 16 is wound by driving the electric motor 31.

  In the example of FIG. 1, the belt reacher 17 that houses the other end of the webbing 16 is disposed between the seat 19 and the vehicle body 11 side such as a pillar 12 and a door (not shown), and buckles through the seat 19. For example, it is provided on the floor surface of the vehicle body 11 via the bracket 18. The belt reacher 17 has a biasing member 17s, and the belt reacher 17 that can be rotated by the rotating shaft 17c with respect to the bracket 18 by the biasing force of the biasing member 17s formed of a spring, for example, Can fall in the forward direction. In the example of FIG. 1, the belt reacher 17 comes into contact with the stopper 21 and stays in a forward inclined posture by the stopper 21 provided on the seat 19, for example.

  FIG. 2 is an explanatory diagram of the storage position of the belt reacher 17 of FIG. In the example of FIG. 1, the belt reacher 17 remains in the forward tilted posture, but the belt reacher 17 can be rotated by the rotating shaft 17 c to the retracted position in the backward or reverse direction of the vehicle by winding the webbing 16. . In the example of FIG. 2, the belt leecher 17 stands almost upright in the retracted position. At this time, the urging force stored in the urging member 17s is the maximum. However, as will be described later, the clutch member 65 moves to a contact position that keeps the electric motor 51 and the webbing reel 15 in contact with each other by winding the webbing 16, and the clutch member 65 is locked to the transmission mechanism 44. The belt reacher 17 stands almost upright without falling forward of the vehicle (see FIG. 2). In other words, the clutch member 65 is unlocked from the transmission mechanism 44 by pulling out the webbing 16, and the belt reacher 17 falls forward of the vehicle as shown in FIG. The operation of the clutch member 65 will be described below, and then the operation of the motor control unit 28 will be described.

  FIG. 3 shows an exploded perspective view of the winding device 14 of FIG. In the example of FIG. 3, the winding device 14 includes a frame 41 attached to the pillar 12. For example, the webbing reel 15 is rotatably provided in the frame 41. A motor drive mechanism 35 is provided outside the frame 41. One end of a webbing 16 is attached to the webbing reel 15, and one end part side 16 a of the webbing 16 is drawn out of the frame 41 from a drawing opening 41 a of the frame 41.

  In the example of FIG. 3, the motor drive mechanism 35 has a gear housing 39 composed of, for example, an inner case 42 and an outer case 43, and the electric motor 31 is attached to the inner case 42 of the gear housing 39. The speed reduction / clutch mechanism 38 connected to the electric motor 31 is accommodated. The deceleration / clutch mechanism 38 is connected to the transmission mechanism 44 that connects the drive shaft 31a of the electric motor 31 to the webbing reel 15, and is engaged with the transmission mechanism 44 to keep the electric motor 31 and the webbing reel 15 in contact with each other. And a clutch mechanism 45 that releases the lock to keep the electric motor 31 and the webbing reel 15 in a disconnected state.

  In the example of the transmission mechanism 44 shown in FIG. 3, for example, a drive gear 47 is provided on the drive shaft 31 a, for example, the first intermediate gear 48 meshes with the drive gear 47, and the second intermediate gear 49, for example, engages with the first intermediate gear 48. For example, a third intermediate gear 51 is engaged with the second intermediate gear 49, and a fourth intermediate gear 52 is formed integrally with the third intermediate gear 51. The fourth intermediate gear 52 is disposed so as to mesh with the final gear 53, for example. Further, for example, a final gear 53 is rotatably attached to the outer case 43, for example, a reduction plate 54 is disposed coaxially with the final gear 53, and the reduction plate 54 is attached to, for example, a carrier 57 via pins 56, 56, 56, for example. By being attached, one of the planetary gears 58, 58, 58 is rotatably supported on each of the pins 56, 56, 56, and the planetary gears 58, 58, 58 are, for example, attached to the internal teeth 61 a of the internal gear 61. The carrier 57 is connected to the connecting shaft 15 a of the webbing reel 15 while being engaged with, for example, the sun gear 62 of the final gear 53. Here, the bearings 63 and 64 support the carrier 57.

  In the example of FIG. 3, the clutch mechanism 45 includes a clutch member 65 (clutch pawl) that is rotatably attached to the inner case 42 via, for example, a pawl pin 68, a return spring 69 provided on the pawl pin 68, and a third intermediate A lever spring 72 attached to a support shaft 71 (see FIG. 4) of the gear 51, and a stopper member 74 (see FIG. 4) for positioning the clutch member 65 at a position to keep the electric motor 31 and the webbing reel 15 in the disconnected state. Prepare. Here, the clutch member 65 includes a locking claw 67, and the locking claw 67 is a claw that can be locked to a ratchet 61 b formed on the outer periphery of the internal gear 61. The ratchet 61b is an internal gear 61. The distal end portion 72 a of the lever spring 72 is fitted in the fitting hole 66 of the clutch member 65.

  FIG. 4 is an explanatory diagram of the motor drive mechanism 35 of FIG. The motor drive mechanism 35 rotates the drive shaft 31a of the electric motor 31 in one direction as indicated by an arrow A (for example, counterclockwise), thereby driving the drive gear 47 and the first to fourth intermediate gears 48, 49, 51. , 52 rotate as indicated by solid arrows, the final gear 53 rotates as indicated by arrow B, and the sun gear 62 rotates as indicated by arrow C.

  On the other hand, the motor drive mechanism 35 rotates the drive shaft 31a of the electric motor 31 to the other side (for example, clockwise direction) as indicated by a dotted arrow D, whereby the drive gear 47 and the first to fourth intermediate gears 48, 49, 51, 52 rotate in the opposite direction to the solid arrow, the final gear 53 rotates as indicated by the dotted arrow E, and the sun gear 62 rotates as indicated by the dotted arrow F.

  FIG. 5 is an explanatory diagram of the contact state of the clutch mechanism 45 of FIG. In the example of FIG. 5, for example, as shown in FIG. 4, the third intermediate gear 51 rotates as indicated by an arrow G by rotating the electric motor 31 in one direction (for example, counterclockwise). At this time, the support shaft 71 rotates integrally with the third intermediate gear 51 as indicated by the arrow G, so that the lever spring 72 swings as indicated by the arrow H. The distal end portion 72a of the lever spring 72 urges the latching claw 67 of the clutch member 65 toward the ratchet 61b against the spring force of the return spring 69, so that the clutch member 65 has an arrow I about the pawl pin 68 as an axis. Thus, the swinging claw 67 is locked to the ratchet 61b.

  Thus, by rotating the electric motor 31 in one direction (for example, counterclockwise direction), the clutch member 65 can be moved to the contact position and can be locked to the transmission mechanism 44. When the locking claw 67 is locked to the ratchet 61b, the internal gear 61 is prevented from rotating in the clockwise direction, for example.

  By the way, when the fourth intermediate gear 52 rotates as indicated by the arrow G integrally with the third intermediate gear 51, the final gear 53 rotates as indicated by the arrow B. Accordingly, the sun gear 62 rotates integrally with the final gear 53 as indicated by an arrow C, and the planetary gears 58, 58, 58 rotate as indicated by solid arrows. Since the internal gear 61 is restrained from rotating in the clockwise direction, the planetary gears 58, 58, 58 revolve as indicated by the arrow J while rotating as indicated by the solid line arrows. When the planetary gears 58, 58, 58 revolve as indicated by an arrow J, the carrier 57 in FIG. 3 rotates, for example, in the counterclockwise direction. The webbing reel 15 shown in FIG. 3 rotates together with the carrier 57 in the counterclockwise direction, for example, and the webbing 16 is wound around the webbing reel 15. Note that the belt reacher 17 of FIG. 2 is almost upright because the webbing 16 is completely wound when the occupant is not wearing the webbing 16 or the seat belt.

  FIG. 6 is an explanatory diagram of the disengaged state of the clutch mechanism 45 of FIG. In the example of FIG. 6, for example, as shown in FIG. 4, the third intermediate gear 51 rotates as indicated by an arrow K by rotating the electric motor 31 to the other side (for example, clockwise). At this time, the support shaft 71 rotates integrally with the third intermediate gear 51 as indicated by the arrow K, so that the lever spring 72 swings as indicated by the arrow L. Further, the clutch member 65 is moved away from the ratchet 61b by the pressing force applied to the clutch member 65 by the distal end portion 72a of the lever spring 72 and the spring force of the return spring 69. Since the clutch member 65 swings about the pawl pin 68 to the disengaged position as shown by the arrow M, the locking claw 67 is separated from the ratchet 61b.

  Thus, by rotating the electric motor 31 to the other side (for example, clockwise direction), the clutch member 65 can be moved to the disengaged position. At this time, the clutch member 65 abuts against the stopper member 74 and is disengaged. Positioned. When the locking claw 67 of the clutch member 65 is separated from the ratchet 61b, the internal gear 61 becomes rotatable. In addition, the webbing 16 can be pulled out from the webbing reel 15 by continuing the rotation of the electric motor 31 in the clockwise direction. When the occupant does not wear the webbing 16, the webbing 16 is pulled out, so that the belt reacher 17 is tilted forward or forward by the urging force of the urging member 17s of FIG.

  However, when the urging force of the urging member 17s is strong, it is not necessary to continue the clockwise rotation of the electric motor 31 after the locking claw 67 of the clutch member 65 is separated from the ratchet 61b. The webbing 16 may be able to be pulled out from the webbing reel 15 only by the urging force.

  FIG. 7 is a flowchart showing an operation example of the control device 20 of FIG. In the example of FIG. 7, first, the motor control unit 28 of the control device 20 of FIG. 1 inputs a signal representing the detection result of the temperature detection unit 25 that detects the temperature of the door opening / closing detection unit 29, and the door opening / closing detection unit It is determined whether or not the temperature of 29 is lower than a predetermined value, specifically, whether or not the temperature of the door opening / closing detection unit 29 is equal to or higher than −30 [degree] Centigrade (step S0). When the temperature of the door opening / closing detection unit 29 is equal to or higher than minus 30 [degrees] Celsius, the motor control unit 28 executes Step S1. On the other hand, when the temperature of the door opening / closing detection unit 29 is not equal to or lower than minus 30 [degree] Celsius, that is, when the temperature of the door opening / closing detection unit 29 is low, the motor control unit 28 executes Step S10.

  In the example of step S <b> 1 shown in FIG. 7, the motor control unit 28 inputs a signal representing the detection result of the door opening / closing detection unit 29 that detects opening / closing of the vehicle door, and changes from the closed state of the door to the open state. The presence or absence of is determined. When the door opening / closing detection unit 29 is configured by, for example, a door switch, the door switch outputs a signal indicating, for example, “Low” or “0” when detecting that the door is closed, while the door switch opens the door. For example, a signal indicating “High” or “1” is output.

  For example, when the door switch outputs a signal indicating a change of “High” from “Low”, for example, in the example of step S1 shown in FIG. When detected by 29, the motor control unit 28 executes step S2. On the other hand, when the door opening / closing detection unit 29 does not detect a change from the closed state to the open state, the motor control unit 28 executes Step S0. Therefore, when the temperature of the door opening / closing detection unit 29 is equal to or higher than minus 30 [degrees] Celsius, the motor control unit 28 executes Step S1 again. In other words, the motor control unit 28 stands by in step S1 until the door is opened.

  In the example of step S2 shown in FIG. 7, the motor control unit 28 in FIG. 1 controls the electric motor 31 so that the webbing 16 is wound around the webbing reel 15 in FIG. Specifically, the motor control unit 28 drives the electric motor 31 connected to the webbing reel 15 via the transmission mechanism 44 to rotate forward, and the electric motor 31 rotates, for example, counterclockwise, thereby causing the webbing 16 to rotate. Is stored in the winding device 14. At this time, the motor control unit 28 in FIG. 1 determines whether, for example, a positive drive current when the electric motor 31 is driven to rotate forward is, for example, 2 [A] or more (step S3).

  The tension detection unit 26 in FIG. 1 is configured by, for example, a current sensor, and when the webbing 16 is completely wound around the webbing reel 15, in other words, the belt reacher 17 is stored behind the vehicle by winding the webbing 16. When the belt reacher 17 is almost upright in the retracted position as shown in FIG. 2 as shown in FIG. 2, the tension of the webbing 16 increases, and therefore the driving current of the electric motor 31 detected by, for example, a current sensor is, for example, 2 [A] is exceeded. At this time, in the example of step S4 shown in FIG. 7, the motor control unit 28 of FIG. 1 stops the control of the electric motor 31 in step S2 so as to stop the storing operation of the webbing 16 in the winding device 14. To do. Here, when the electric motor 31 once rotates forward and rotates, for example, counterclockwise, the clutch member 65 contacts the electric motor 31 and the webbing reel 15 even when the electric motor 31 stops rotating forward. The clutch stays in the contact position that maintains the state, and the clutch (contact state) of the clutch mechanism 45 is maintained (see FIG. 5).

  As the motor control unit 28 executes steps S3 and S4, the belt reacher 17 is rotated to the storage position. At this time, the position of the belt reacher 17 is held at an ideal storage position so as not to obstruct the operation of the occupant. Thereafter, the position of the belt reacher 17 is held at the retracted position until the motor control unit 28 executes Step S8.

  After the motor control unit 28 executes step S4 shown in FIG. 7, in the example of step S5, the motor control unit 28 determines whether there is a change from the open state to the closed state of the door. The motor control unit 28 stands by in step S5 until the door is closed, and when the door opening / closing detection unit 29 detects a change from the open state to the closed state, the motor control unit 28 executes step S6. .

  In the example of step S <b> 6 shown in FIG. 7, the motor control unit 28 inputs a signal representing the detection result of the occupant detection unit 30 that detects contact by the occupant to the side surface of the seat unit, and for example, to the side surface 19 s of the seat 19 Detects the presence or absence of contact by passengers. When the occupant detection unit 30 is configured by a capacitance sensor, for example, the capacitance sensor detects, for example, “High” or “1” when detecting that the occupant's hand, for example, is within a predetermined distance from the capacitance sensor. On the other hand, the capacitance sensor outputs a signal indicating, for example, “Low” or “0” when detecting that the hand is not within the predetermined distance from the capacitance sensor.

  Depending on the setting of the capacitance sensor, the occupant's hand does not actually contact the side surface 19s (capacitance sensor) of the seat 19 and the hand approaches the side surface 19s (capacitance sensor), so that the motor control unit 28 detects the presence of contact by the passenger on the side surface 19s of the seat 19. In other words, in this specification, the concept of contact includes not only actual contact but also substantial contact.

  For example, in the example of FIG. 2, the occupant detection unit 30 or the capacitance sensor is provided on the side surface 19s of the seat 19 as the side surface of the seat unit, but the belt reacher 170 that rotates forward of the vehicle as shown in FIG. The occupant detection unit 30 or the electrostatic capacity sensor is a side surface of the seat part so that the operation by the occupant to the operation part such as the reclining lever 22 and the seat position adjustment button (not shown) which are disturbed by the occupant can be detected. It may be provided at an arbitrary position. For example, when the reclining lever 22 is disposed not on the front side of the vehicle but on the rear side of the vehicle or on the seat back 7 side with respect to the stopper 21 (and for example, a seat position adjustment button is also disposed on the side surface 19s of the seat 19), The occupant detection unit 30 or the capacitance sensor may be provided, for example, on the side surface 7s of the seat back 7 (and the side surface 19s of the seat 19).

  In the example of step S6 shown in FIG. 7, for example, when there is contact by the occupant on the side surface 19s of the seat 19, the motor control unit 28 executes step S7. In the example of step S7, the motor control unit 28 continues to stop control of the electric motor 31 in step S4, and thereby the clutch (contact state) of the clutch mechanism 45 is also maintained. In other words, the motor control unit 28 stands by in step S6 until there is no contact by the passenger.

  In the example of step S6 shown in FIG. 7, for example, when there is no contact by the occupant on the side surface 19s of the seat 19, the motor control unit 28 executes step S8. In the example of step S8, the motor control unit 28 drives the electric motor 31 in the reverse direction, and the electric motor 31 rotates, for example, in the clockwise direction, so that the clutch member 65 brings the electric motor 31 and the webbing reel 15 into the disconnected state. Move to the position to keep. Specifically, the motor control unit 28 can reversely drive the electric motor 31 so that the webbing 16 is pulled out from the webbing reel 15 at a predetermined speed, for example. At this time, as the webbing 16 is pulled out, the belt reacher 17 can be rotated forward of the vehicle by the biasing member 17s. In other words, the webbing 16 cannot be pulled out only by the urging force of the urging member 17 s, and when the webbing 16 is pulled out by the electric motor 31, the belt reacher 17 falls to the front of the vehicle as much as the webbing 16 is pulled out. The belt reacher 17 rotates forward of the vehicle according to the reverse rotation speed of the vehicle. When the webbing 16 is pulled out to the maximum extent, the motor control unit 28 stops the control of the electric motor 31 (step S9). As a result, the belt leecher 17 comes into contact with the stopper 21 and stays in the forward tilted position by the stopper 21, and the belt leecher 17 extends completely.

  However, when the urging force of the urging member 17s is strong, it is not necessary to continue the reverse drive of the electric motor 31 after the clutch member 65 moves from the contact position to the disconnection position, and only the urging force of the urging member 17s. The webbing 16 may be drawable from the webbing reel 15.

  As described above, when the temperature of the door opening / closing detection unit 29 is not low (step S1), the belt reacher 17 is rotated to the storage position in FIG. 2 (step S4), and the door is changed from the open state to the closed state. When contact with the side surface of the seat part is not detected by the occupant detection part 30 at a time (step S6) when a predetermined time has elapsed from the time detected by the door opening / closing detection part 29 (step S5), the motor control part 28 The electric motor 31 is controlled so that the member 65 moves from the contact position to the disconnection position (step S8). On the other hand, when contact with the side surface of the seat portion is detected by the occupant detection unit 30 at a predetermined time (step S6), the motor control unit 28 continues to stop control of the electric motor 31 (step S7). Update a predetermined time (or a predetermined time). The motor control unit 28 stands by in step S6 until the door opening / closing detection unit 29 detects a change from the open state to the closed state at the updated predetermined time (step S6). When a change from the open state of the door to the closed state is detected by the door opening / closing detection unit 29 at the updated predetermined time (step S6), that is, for example, there is no contact by the passenger on the side surface 19s of the seat 19 When the motor control unit 28 changes to, the motor control unit 28 drives the electric motor 31 in the reverse direction (step S8), whereby the extension of the belt reacher 17 is completed.

  After the extension of the belt reacher 17 is completed, the motor control unit 28 may determine whether or not the occupant has completed wearing the webbing 16 or the seat belt by turning on the buckle switch. The motor control unit 28 may control the electric motor 31 so that the 16 slacks are removed.

  In the example of step S1 shown in FIG. 7, when the temperature of the door opening / closing detection unit 29 is low, the motor control unit 28 causes the electric motor so that the webbing 16 is wound around the webbing reel 15 as in step S2. 31 is rotated forward (step S10). However, since the door opening / closing detection unit 29 may not operate at a low temperature, the motor control unit 28 does not execute step S1, and the belt reacher 17 is stored in the storage position regardless of the detection result of the door opening / closing detection unit 29. The electric motor 31 is controlled so as to rotate (step S10). Thereafter, similarly to steps S3 and S4, the motor control unit 28 continues the forward rotation of the electric motor 31 until the drive current of the electric motor 31 exceeds 2 [A], for example (step S11). When it exceeds 2 [A], the forward drive of the electric motor 31 is stopped (step S12).

  When the temperature of the door opening / closing detection unit 29 decreases, the belt reacher 17 rotates to the storage position under the control of the motor control unit 28 regardless of the detection result of the door opening / closing detection unit 29 (step S12). Since the belt reacher 17 is disposed at the retracted position when the door opening / closing detection unit 29 does not operate at a low temperature, the belt reacher 17 does not get in the way when an occupant gets into the vehicle.

  In the example of step S13 shown in FIG. 7, the motor control unit 28 causes the clutch member 65 to move from the contact position to the disengagement position when there is no contact by the occupant to the side surface 19s of the seat 19 at a predetermined time, for example. Then, the electric motor 31 is driven in reverse (step S8). Specifically, in the example of step S13 shown in FIG. 7, the predetermined time is a state in which, for example, the side surface of the seat 19 is in a state in which the belt reacher 17 is rotated to the storage position regardless of the detection result of the door opening / closing detection unit 29. This is the time when a predetermined time has passed since the occupant detection unit 30 detected contact with the occupant at 19s. When the occupant gets into the vehicle, for example, the hand of the occupant contacts the side surface 19s of the seat 19, and if such contact is no longer detected, the completion of the occupant's boarding can be estimated. Can start rotating the vehicle forward.

  As described above, when the temperature of the door opening / closing detection unit 29 is low (step S1), the belt reacher 17 is rotated to the storage position in FIG. 2 (step S12), for example, by a passenger on the side surface 19s of the seat 19 When the contact changes from presence to absence (step S13), the motor control unit 28 controls the electric motor 31 so that the clutch member 65 moves from the contact position to the disengagement position (step S8). In step S13, the motor control unit 28 waits once until there is contact by the occupant on the side surface 19s of the seat 19, and after that, when the contact continues at a time after a predetermined time has elapsed, Time). The motor control unit 28 stands by in step S13 until a change from the presence of contact to the absence of contact is detected by the occupant detection unit 30 at the updated predetermined time. At the updated predetermined time (step S13), for example, when the occupant contacts the side surface 19s of the seat 19 changes from presence to absence, the motor control unit 28 reversely drives the electric motor 31 (step S8). Thus, the extension of the belt reacher 17 is completed.

  When the temperature of the door opening / closing detection unit 29 decreases, in the example of step S <b> 13 shown in FIG. 7, the motor control unit 28 determines, for example, the side surface of the seat 19 at a predetermined time regardless of the detection result of the door opening / closing detection unit 29. It is possible to determine whether or not there is no contact with the upper surface 19u of the seat 19, the side surface 7s of the seat back 7, the front surface 7f, the headrest 5 and the like as well as 19s. In other words, when the occupant gets into the vehicle, not only the occupant's hand, for example, touches the side surface 19s of the seat 19, but also when the occupant gets into the vehicle, the occupant's back, for example, contacts the front surface 7f of the seat back 7, Since, for example, the head of the passenger contacts the front surface of the headrest 5, for example, when such a contact is not detected, the completion of the passenger's boarding can be estimated.

  Therefore, for example, in the example of FIG. 2, the occupant detection unit 30 or the capacitance sensor is provided on the side surface 19 s of the seat 19 as the side surface of the seat unit. In this case, the occupant detection unit 30 or the capacitance sensor may be provided at an arbitrary position (for example, the side surfaces 19s, 7s, the front surface 7f, the upper surface 19u, etc.) of the seat unit.

  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. .

  DESCRIPTION OF SYMBOLS 5 ... Headrest, 7 ... Seat back, 7f ... Front, 7s ... Side, 10 ... Seat belt device, 11 ... Vehicle body, 12 ... Pillar, 12a ... Lower part , 13 ... Through anchor, 14 ... Winding device, 15 ... Webbing reel, 15a ... Connection shaft, 16 ... Webbing, 16a ... One end side, 16b ... Other end Part side, 17 ... belt reacher, 17c ... rotating shaft, 17s ... biasing member, 18 ... bracket, 19 ... sheet, 19s ... side face, 19u ... top face, 20 ... Control device, 21 ... Stopper, 22 ... Recliner lever, 23 ... Tang plate, 24 ... Buckle, 25 ... Temperature detector, 26 ... Tension detector, 27 ..Seat belt wearing detector, 28 Control unit, 29 ... door opening / closing detection unit, 30 ... occupant detection unit, 31 ... electric motor, 31a ... drive shaft, 32 ... motor drive unit, 35 ... motor drive mechanism , 38 ... Deceleration / clutch mechanism, 39 ... Gear housing, 41 ... Frame, 41 a ... Drawer opening, 42 ... Inner case, 43 ... Outer case, 44 ... Transmission mechanism 45 ... clutch mechanism, 47 ... drive gear, 48, 49, 51, 52 ... intermediate gear, 53 ... final gear, 54 ... reduction plate, 56 ... pin, 57 ..Carrier, 58 ... Planetary gear, 61 ... Internal gear, 61a ... Internal teeth, 61b ... Ratchet, 62 ... Sun gear, 63, 64 ... Bearing, 65 ... Clutch Member, 66 ... fitting , 67 ... locking claw 68 ... pawl pin, 69 ... return spring, 71 ... support shaft, 72 ... lever spring, 72a ... front end portion, 74 ... stopper member.

Claims (5)

A webbing reel capable of winding the webbing;
An electric motor coupled to the webbing reel via a transmission mechanism;
A clutch member movable to a contact position for keeping the electric motor and the webbing reel in contact or a disconnect position for keeping the electric motor and webbing reel in a disconnected state;
A belt reacher that can be rotated forward of the vehicle by an urging member, and can be rotated to the retracted position behind the vehicle by winding the webbing;
A door opening / closing detection unit for detecting opening / closing of the door of the vehicle;
An occupant detection unit that detects contact by the occupant to the side surface of the seat part;
A motor control unit for controlling the electric motor;
With
When the contact with the side surface of the seat portion is not detected by the occupant detection unit at a predetermined time, the motor control unit controls the electric motor so that the clutch member moves from the contact position to the disengagement position. A seatbelt device that is controlled.   The predetermined time is a time when a predetermined time has elapsed since a change from the open state to the closed state of the door is detected by the door opening / closing detection unit in a state where the belt reacher is rotated to the storage position. The seat belt device according to claim 1. A temperature detection unit that detects the temperature of the door opening / closing detection unit;
When the temperature is lower than a predetermined value, the predetermined time is the state where the belt reacher is rotated to the storage position, regardless of the detection result of the door opening / closing detection unit, to the side surface of the seat unit. The seat belt device according to claim 1, wherein the seat belt device is set at a time when a predetermined time has elapsed since the contact was detected by the occupant detection unit. A webbing reel capable of winding the webbing;
An electric motor coupled to the webbing reel via a transmission mechanism;
A clutch member movable to a contact position for keeping the electric motor and the webbing reel in contact or a disconnect position for keeping the electric motor and webbing reel in a disconnected state;
A belt reacher that can be rotated forward of the vehicle by an urging member, and can be rotated to the retracted position behind the vehicle by winding the webbing;
A door opening / closing detection unit for detecting opening / closing of the door of the vehicle;
A temperature detection unit for detecting the temperature of the door opening / closing detection unit;
A motor control unit for controlling the electric motor;
With
When the temperature is lower than a predetermined value, the motor control unit controls the electric motor so that the belt reacher rotates to the retracted position regardless of a detection result of the door opening / closing detection unit. A seat belt device. An occupant detection unit for detecting contact by the occupant to the seat part;
When the contact to the seat portion is not detected by the occupant detection unit at a predetermined time, the motor control unit controls the electric motor so that the clutch member moves from the contact position to the disengagement position,
When the temperature is lower than the predetermined value, the predetermined time is the contact of the seat with the belt reacher rotated to the retracted position regardless of the detection result of the door open / close detection unit. The seat belt device according to claim 4, wherein the seat belt device is a time when a predetermined time elapses from the time when it is detected by the occupant detection unit.

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