JP6093245B2 - Seat belt device - Google Patents

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. 3 of Patent Document 2 discloses a seat belt device 1 including a friction boot 20. In addition, according to the description of paragraphs [0031] and [0032] of Patent Document 2, the friction boot 20 is in a standing state with the friction boot 20 indicated by a two-dot chain line, and the friction boot 20 is in a belt holding state with a solid line. is there. Since the friction boot 20 is maintained in the belt holding state, the belt 3 does not get in the way when the passenger in the rear seat gets off the vehicle.

JP 2011-84081 A JP 2010-23609 A

  The belt reacher 170 of Patent Document 1 does not include the friction boot 20 of Patent Document 2. Even if the friction boot 20 of Patent Document 2 is provided in the belt reacher 170 of Patent Document 1, according to the description of paragraphs [0070] and [0074] of Patent Document 2, the door D of FIG. When the friction boot 20 is in the belt holding state based on the detection result of the rotation angle sensor 14 in FIG. 4, the holding restriction flag is turned on, and the boot return restriction portion 15 a in FIG. 4 reduces the driving force of the motor 13. Let

  However, according to the description of paragraph [0069] of Patent Document 2, the pull-out amount ΔX (detection result) of the belt 3 detected by the rotation angle sensor 14 in step S55 of FIG. It is necessary to determine whether or not the friction boot 20 corresponds to the pull-out amount range (ΔX1 ≦ ΔX ≦ ΔX2) when the friction boot 20 is operated to the belt holding state. In other words, the belt holding state is fixed, and it is necessary to tilt the friction boot 20 almost horizontally to the belt holding state. In particular, when the belt reacher 170 of Patent Document 1 and the friction boot 20 of Patent Document 2 are combined, the friction boot 20 provided in the belt reacher 170 is urged forward by the return spring 182, so that the friction boot 20 is A certain amount of force is required for the occupant in order to bring the belt down. As described above, the occupant cannot comfortably operate the belt reacher 170 including the friction boot 20. In particular, when the occupant in the rear seat is a woman, a child, or the like, the friction boot 20 is difficult to reach the belt holding state.

  One object of the present invention is to provide a seat belt device in which the belt reacher does not get in the way when a passenger in the rear seat gets off the vehicle. Another object of the present invention is to provide a seat belt device including a belt reacher that can be comfortably operated by an occupant. Other objects of the present invention will become apparent to those skilled in the art by referring to the aspects and preferred embodiments exemplified below and the accompanying drawings.

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

In the first aspect, the seat belt device comprises:
A 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 the biasing member, can be rotated to the storage position at the rear of the vehicle by winding the webbing , and can be further rotated to the rear of the vehicle from the storage position. When,
A holding mechanism that can be held at an arbitrary holding position so as not to rotate forward by the biasing member even when the belt reacher is not winding the webbing by the electric motor ;
Equipped with a,
The more amount of rotation is pre Symbol belt reacher rotates in the rear of the vehicle, the holding force of the holding mechanism is large.

  In the first aspect, since the belt reacher can further rotate rearward from the retracted position, the belt reacher does not get in the way when the passenger in the rear seat gets out of the vehicle. Further, since the belt reacher can be rotated forward of the vehicle by the biasing member, the biasing force of the biasing member is larger as the rotation amount of the belt reacher rotating rearward of the vehicle is larger. In other words, the force required for the occupant to increase the amount of rotation by which the belt reacher rotates rearward of the vehicle against the urging force of the urging member increases. However, the seat belt device includes a holding mechanism that can hold the rotation of the belt reacher, and the holding force of the holding mechanism increases as the amount of rotation by which the belt reacher rotates rearward of the vehicle increases. Therefore, since the urging force of the urging member is reduced by the holding force of the holding mechanism, the occupant can rotate the belt reacher from the retracted position toward the vehicle with a small force. In this way, the occupant can comfortably operate the belt reacher further from the retracted position to the rear of the vehicle.

  In particular, when the occupant of the rear seat is a woman, a child, or the like, even if the rotation amount of the belt reacher rotating to the rear of the vehicle does not become the maximum, the holding mechanism is in the belt at any holding position from the storage position. Reachers can be held. In other words, even if the amount of rotation by which the belt reacher rotates rearward of the vehicle is not maximized, the belt reacher does not get in the way when a woman, a child, or the like who is a passenger in the rear seat gets off the vehicle.

In a second aspect dependent on the first aspect, the seat belt device comprises:
A door opening / closing detection unit for detecting opening / closing of the door of the vehicle;
A motor control unit for controlling the electric motor;
May further comprise
When a change from the closed state to the open state of the door is detected by the door opening / closing detection unit, the motor control unit may control the electric motor so that the belt reacher is disposed at the storage position. Often,
Thereafter, the motor control unit controls the electric motor so that the tension of the webbing is constant until a change in the door from the open state to the closed state is detected by the door opening / closing detection unit. May be.

  In the second aspect, when the door is opened, the belt reacher is disposed in the retracted position, and thereafter, the electric motor is controlled so that the webbing tension is constant until the door is closed. Therefore, when the occupant gets into the vehicle, even if the hand of the occupant touches the belt reacher, the belt reacher can remain in the retracted position. In other words, if the electric motor stops so that the webbing tension becomes zero and the occupant, for example, the hand touches the belt reacher, the belt reacher may be biased forward of the vehicle. In the second aspect, since the webbing tension is constant, it is possible to avoid the belt reacher being urged forward of the vehicle before the occupant finishes riding the vehicle.

In a third form subordinate to the second form,
When the change of the door from the closed state to the open state is detected by the door opening / closing detection unit before the tension of the webbing becomes constant, the tension of the webbing becomes larger than the constant. The electric motor may be controlled as described above.

In the third aspect, the webbing tension is set large when the door is opened before the webbing tension becomes constant. Therefore, when the belt leecher is disposed behind the vehicle from the storage position, the belt leecher can return to the storage position more reliably with a large tension.
In a fourth aspect dependent on the first aspect,
The holding mechanism may be arranged offset with respect to the belt reacher in the axial direction of the rotation axis of the belt reacher.

  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 structural example of the holding mechanism holding the belt reacher of FIG. 1 is shown. 4A shows an example of a change in the arrangement position of the belt reacher of FIG. 1, and FIG. 4B is an explanatory view of the arrangement position of the pins of the holding mechanism corresponding to the arrangement position of FIG. FIG. 4C shows an explanatory diagram of the holding force of the holding mechanism. The disassembled perspective view of the winding apparatus of FIG. 1 is shown. FIG. 6 is an explanatory diagram of the motor drive mechanism of FIG. 5. FIG. 6 is an explanatory diagram of a contact state of the clutch mechanism of FIG. 5. FIG. 6 is an explanatory diagram of a disengaged state of the clutch mechanism of FIG. 5. 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 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. The inserted tongue plate 23, the buckle 24 engaged with the tongue plate 23, and the control device 20 that controls the winding of the webbing 16 can be provided. 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, FIG. 1 only shows an exemplary embodiment, and at least one component of the seat belt device 10 can be selected or determined in accordance with at least one object of the present invention.

  In FIG. 1, the winding device 14 is provided in a lower portion 12 a of a pillar 12 such as a B pillar of a 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 FIG. 1, the tongue plate 23 is a member that is movably inserted into the webbing 16 and is detachably engaged 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 FIG. 1, the seat belt wearing 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 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 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 FIG. 1, a belt reacher 17 that accommodates the other end of the webbing 16 is disposed between a seat 19 and a vehicle body 11 side such as a pillar 12 and a door (not shown), and the buckle 24 is interposed via the seat 19. It is located on the opposite side and is provided, for example, 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 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. As shown by a solid line in FIG. 2, the belt reacher 17 remains in the forward leaning position or the forward leaning position (P1 in FIG. 4A). As indicated by the chain line, the belt reacher 17 can rotate on the rotating shaft 17c to the retracted position (P2 in FIG. 4A) in the backward or reverse direction of the vehicle. The belt reacher 17 is slightly tilted backward at the retracted position, but is almost upright. As will be described later, the clutch member 65 is moved to a contact position where the electric motor 51 and the webbing reel 15 are kept in contact with each other by winding the webbing 16, and the clutch member 65 is engaged with the transmission mechanism 44. Due to the reverse drive of the motor 31, the locking to the transmission mechanism 44 is released (step S9 in FIG. 8), and the belt reacher 17 does not fall forward of the vehicle by the holding force of the holding mechanisms 18i, 22p, 22, 22s. , Almost upright at the storage position (see FIG. 4C). In addition, operation | movement of the clutch member 65 and the motor control part 28 is later mentioned in FIGS. 5-8 and FIG.

  After that, for example, when the occupant in the rear seat steps on the belt reacher 17 as shown in FIG. 2, the belt reacher 17 is further moved from the retracted position to the holding position ( It can be rotated up to P3 and P4) in FIG. The greater the amount of rotation that the belt reacher 17 rotates to the rear of the vehicle, the greater the urging force of the urging member 17s and the greater the holding force of the holding mechanisms 18i, 22p, 22, 22s. The belt reacher 17 is held at an arbitrary holding position without falling forward of the vehicle due to the holding force of the holding mechanisms 18i, 22p, 22, 22s. When the amount of rotation of the belt reacher 17 rotating rearward of the vehicle is the maximum (P4 in FIG. 4A), the urging force stored in the urging member 17s is the maximum.

  FIG. 3 shows a configuration example of a holding mechanism that holds the belt reacher 17 of FIG. As shown in FIG. 3, the belt reacher 17 is attached to the vehicle body 11 via a bracket 18 and can be rotated by a rotating shaft 17 c. Holding mechanisms 18i, 22p, 22, 22s are provided between the main body 17b of the belt reacher 17 and the bracket 18, and the pin 22p also rotates according to the rotation of the belt reacher 17 (see FIG. 4B). The pin 22p in contact with the inner surface 18i of the bracket 18 is provided in the rotating part 22, and a spring 22s is provided between the rotating part 22 and the main body 17b. When the force stored in the spring 22s is transmitted to the inner surface 18i of the bracket 18 via the pin 22p, the holding force of the holding mechanisms 18i, 22p, 22, 22s is generated.

  4A shows an example of a change in the arrangement position of the belt reacher 17 of FIG. 1, and FIG. 4B shows the arrangement position of the pin 22p of the holding mechanism corresponding to the arrangement position of FIG. 4A. FIG. 4C is an explanatory diagram of the holding force of the holding mechanism. 4A, when the belt leecher 17 comes into contact with the stopper 21, the arrangement position of the belt leecher 17 is a forward tilt position, and the rotation amount or the rotation angle of the belt leecher 17 is Zero. In other words, the belt reacher 17 is rotatable from the forward tilt position to the rear of the vehicle.

  When the webbing 16 is wound up by the electric motor 51, the arrangement position of the belt reacher 17 changes from the forward tilt position (P1) to the retracted position (P2). The pins 22p of the holding mechanisms 18i, 22p, 22, 22s also rotate according to the rotation of the belt reacher 17, and the arrangement position of the pin 22p starts from the position corresponding to the forward tilt position (P1) of the belt reacher 17. Changes to a position corresponding to the storage position (P2) (see FIG. 4B). Further, when the arrangement position of the belt reacher 17 is the forward tilt position (P1), the force stored in the spring 22s of the holding mechanisms 18i, 22p, 22, 22s is set to, for example, zero, and thus the holding mechanisms 18i, 22p. , 22, 22s also have zero holding force.

  When the belt reacher 17 rotates rearward from the forward tilt position (P1), the pin 22p moves from right to left in FIG. 4C or a top view. When the pin 22p is at a position corresponding to the retracted position (P2), the pin 22p is pushed by the inner surface 18i of the bracket 18, and the distance between the rotating portion 22 and the main body 17b of the belt reacher 17 is reduced. The force is stored in 22s, and the holding force of the holding mechanisms 18i, 22p, 22, 22s is generated. The greater the amount of rotation (P3, P4) that the belt reacher 17 rotates to the rear of the vehicle, the smaller the distance between the rotating portion 22 and the body 17b of the belt reacher 17 and the greater the force stored in the spring 22s. The holding force of the holding mechanisms 18i, 22p, 22, 22s is increased.

  By the way, the belt reacher 17 can be rotated to the front tilt position (P1) forward of the vehicle by the urging member 17s of FIGS. 3 and 1, so that the amount of rotation by which the belt reacher 17 rotates rearward of the vehicle increases. The biasing force of the biasing member 17s is large. In other words, the force required for the occupant to increase the amount of rotation by which the belt reacher 17 rotates from the retracted position (P2) to the rear of the vehicle against the urging force of the urging member 17s increases. End up. However, the seat belt device 10 includes holding mechanisms 18i, 22p, 22, 22s that can hold the rotation of the belt reacher 17, and the greater the amount of rotation (P3, P4) that the belt reacher 17 rotates to the rear of the vehicle, The holding force of the holding mechanisms 18i, 22p, 22, 22s is large. Therefore, since the urging force of the urging member 17s is reduced by the holding force of the holding mechanisms 18i, 22p, 22, 22s, the occupant rotates the belt reacher 17 from the storage position (P2) to the rear of the vehicle with a small force. be able to. In this way, the passenger can comfortably operate the belt reacher 17 further from the retracted position (P2) to the rear of the vehicle.

  In particular, when the occupant in the rear seat is a woman, a child, or the like, the holding mechanisms 18i, 22p, 22, 22s can be used even when the rotation amount of the belt reacher 17 rotating to the rear of the vehicle does not reach the maximum (P4). The belt reacher 17 can be held at an arbitrary holding position (P3) from the storage position (P2). In other words, even if the amount of rotation that the belt reacher 17 rotates to the rear of the vehicle does not reach the maximum (P4), the belt reacher 17 does not fall forward of the vehicle and the woman or child who is a passenger in the rear seat Etc. does not get in the way when getting off the vehicle.

  FIG. 5 shows an exploded perspective view of the winding device 14 of FIG. In FIG. 5, the winding device 14 includes a frame 41 attached to the pillar 12. For example, a 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 FIG. 5, 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. A deceleration / clutch mechanism 38 connected to the 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. 5, 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 FIG. 5, the clutch mechanism 45 includes a clutch member 65 (clutch pawl) 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 gear 51. And a stopper member 74 (see FIG. 6) for positioning the clutch member 65 at a position for keeping the electric motor 31 and the webbing reel 15 in the disconnected state. 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. 6 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. 7 is an explanatory view of a contact state of the clutch mechanism 45 of FIG. In FIG. 7, for example, as shown in FIG. 6, 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. As the planetary gears 58, 58, 58 revolve as indicated by an arrow J, the carrier 57 in FIG. 5 rotates, for example, in the counterclockwise direction. The webbing reel 15 shown in FIG. 5 rotates together with the carrier 57 in a counterclockwise direction, for example, and the webbing 16 is wound around the webbing reel 15. Note that the webbing 16 is completely wound when the occupant is not wearing the webbing 16 or the seat belt, so that the belt reacher 17 of FIG. 4A is almost upright at the retracted position (P2).

  FIG. 8 is an explanatory diagram of the disengaged state of the clutch mechanism 45 of FIG. In FIG. 8, for example, as shown in FIG. 6, the third intermediate gear 51 rotates as indicated by an arrow K by rotating the electric motor 31 in the other direction (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 in position. 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. 9 is a flowchart showing an operation example of the control device 20 of FIG. 9, first, the motor control unit 28 of the control device 20 of FIG. 1 inputs a signal representing the detection result of the door opening / closing detection unit 29 that detects the opening / closing of the door of the vehicle, and the door is opened from the closed state to the opened state. It is determined whether or not there is a change to (step S0). 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, when a change from the closed state to the open state of the door is detected by the door opening / closing detection unit 29, the motor control unit 28 executes step S1. 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.

  In step S <b> 1 shown in FIG. 9, the motor control unit 28 of FIG. 1 controls the electric motor 31 so that the webbing 16 is wound around the webbing reel 15. 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, 10 [A] or more (step S2).

  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 at the retracted position (P2) as shown in FIG. 4A after rotating to the position, the tension of the webbing 16 increases, and thus, for example, the electric motor 31 detected by the current sensor. For example, exceeds 10 [A]. At this time, in step S3 shown in FIG. 9, the motor controller 28 in FIG. 1 does not stop the storing operation of the webbing 16 in the winding device 14, but the positive drive current of the electric motor 31 in step S2. Is reduced to 1 [A], for example. Here, when the electric motor 31 is once rotated forward and rotated, for example, in the counterclockwise direction, the clutch member 65 remains in a contact position that keeps the electric motor 31 and the webbing reel 15 in contact, and the clutch of the clutch mechanism 45 (Contact state) is maintained (see FIG. 5).

  After the motor control unit 28 executes step S3, in step S4, the motor control unit 28 determines whether or not there is a change from the open state to the closed state of the door. The motor control unit 28 stands by in step S4 until the door is closed, and when the change from the open state to the closed state of the door is detected by the door opening / closing detection unit 29, the motor control unit 28 executes step S5. . As described above, when the door is opened, the belt reacher 17 is disposed at the retracted position (step S2), and thereafter, the electric motor 31 is set to, for example, 1 [so that the tension of the webbing 16 is constant until the door is closed. A] continues to be controlled (step S3). Therefore, even if the passenger touches the belt reacher 17 when the passenger gets into the vehicle, the belt reacher 17 can remain in the retracted position. In other words, if the electric motor 31 stops so that the tension of the webbing 13 becomes zero in step S3, and the occupant's hand touches the belt reacher 17, the belt reacher 17 is urged forward of the vehicle. there is a possibility. In step S3, since the tension of the webbing 13 is constant by the electric motor 31 (1 [A]), the belt reacher 17 is prevented from being urged forward of the vehicle before the occupant finishes riding on the vehicle. Can do.

  If the door opening / closing detection unit 29 detects a change from the closed state to the open state before the tension of the webbing 13 becomes constant in step S3, the tension of the webbing 13 is 1 [A in step S2. The electric motor 31 is controlled at, for example, 10 [A] so as to be larger than a fixed value by driving. In step S2, the tension of the webbing 13 is set to be large when the door is opened before the tension of the webbing 13 becomes constant by 1 [A] driving. Therefore, when the belt reacher 17 is disposed at the holding position (P3, P4), for example, behind the vehicle from the storage position, the belt reacher 17 can return to the storage position (P2) more reliably with a large tension. The positive drive current (10 [A]) in step S2 is not only the drive current (1 [A]) in step S3, but also the drive currents (3 [A], 5 in steps S8 and S12 described later). Larger than [A]) and set to the maximum. On the other hand, the positive drive current (1 [A]) in step S3 is smaller than the drive current (3 [A]) for performing slack removal in step S8 described later in order to reduce power consumption.

  In the example of step S <b> 5 shown in FIG. 9, the motor control unit 28 rotates 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 is connected to the electric motor 31 and the webbing reel 15. Move to the disconnection position that keeps the disconnection state. 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 S5). 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 able to be pulled out from the webbing reel 15 (step S5).

  After the extension of the belt reacher 17 is completed, in step S6, the motor control unit 28 determines whether or not the buckle switch is turned on and the occupant of the front seat has completed wearing the webbing 16 or the seat belt. In step S7, the motor control unit 28 turns off the electric motor 31 so that the slack of the webbing 16 is removed when the seatbelt wearing detection unit 27 outputs the change from OFF to ON of the buckle switch to the motor control unit 28. Control. Specifically, the motor control unit 28 drives the electric motor 31 to rotate forward until the positive drive current exceeds, for example, 3 [A] (step S8). Since the clutch (contact state) of the clutch mechanism 45 is held by the normal rotation drive of the electric motor 31, after the slack removal operation by the electric motor 31 is completed, in step S9, the motor control unit 28 determines the clutch (contact state). The electric motor 31 is controlled so as to be released. After the motor control unit 28 rotates the electric motor 31 in the reverse direction for a short time, the motor control unit 28 stops the reverse rotation driving of the electric motor 31 in step S10.

  Thereafter, in step S11, the motor control unit 28 determines whether or not the buckle switch is turned off and the front seat occupant has released the webbing 16 or the seat belt. When the seat belt attachment detection unit 27 outputs a change from ON to OFF of the buckle switch to the motor control unit 28, the motor control is performed so that the webbing 16 is wound around the webbing reel 15 and the belt reacher 17 returns to the storage position. The unit 28 controls the electric motor 31 in step S12. Specifically, the motor control unit 28 drives the electric motor 31 to rotate forward until the positive drive current exceeds 5 [A], for example (step S13). Thereafter, similarly to steps S9 and S10, the motor control unit 28 reversely drives the electric motor 31 for a short time and stops the reverse driving of the electric motor 31 (steps S14 and S15). Since the clutch (contact state) is released in step S14, when the passenger in the rear seat gets out of the vehicle, the passenger in the rear seat moves the belt reacher 17 from the retracted position (P2 in FIG. 4A) with a small force. Furthermore, it can rotate to the holding position (P3, P4 in FIG. 4A) at the rear of the vehicle. Even when the belt reacher 17 is arranged at the holding position (P3, P4) from the storage position (P2) to the rear of the vehicle, when the door is opened at step S0, the webbing tension is increased at step S2. Thus, the belt reacher 17 can return to the storage position (P2).

  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 10 ... Seat belt apparatus, 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, 16b · · · other end, 17 · · · belt reacher, 17b · · · body, 17c · · · rotation shaft, 17s ..Biasing member, 18 ... bracket, 18i ... inner surface, 19 ... sheet, 20 ... control device, 22 ... rotating part, 22p ... pin 23 ... tang plate, 24 ... Buckle, 26 ... Tension detector, 27 ... Seat belt attachment detector, 28 ... Motor controller, 29 ... Door open / close detector, 31 ... Electric motor, 31a ..Drive shaft, 32 ... Motor drive, 35 ... Mode 38 ... deceleration / clutch mechanism, 39 ... gear housing, 41 ... frame, 41a ... drawing 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 gear, 61b ... Ratchet, 62 ... Sun gear, 63, 64 ... Bearing, 65 ..Clutch member, 66... Fitting hole, 67... Pawl, 68 .. pawl pin, 69 .. return spring, 71 .. support shaft, 72 .. lever spring, 72 a. -Tip, 74 ... Strike Pas members.

Claims (4)

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 the biasing member, can be rotated to the storage position at the rear of the vehicle by winding the webbing , and can be further rotated to the rear of the vehicle from the storage position. When,
A holding mechanism that can be held at an arbitrary holding position so as not to rotate forward by the biasing member even when the belt reacher is not winding the webbing by the electric motor ;
Equipped with a,
The more amount of rotation is pre Symbol belt reacher rotates in the rear of the vehicle, a seat belt and wherein the holding force of the holding mechanism is large. A door opening / closing detection unit for detecting opening / closing of the door of the vehicle;
A motor control unit for controlling the electric motor;
Further comprising
When a change from the closed state to the open state of the door is detected by the door opening / closing detection unit, the motor control unit controls the electric motor so that the belt reacher is disposed at the storage position,
Thereafter, the motor control unit controls the electric motor so that the tension of the webbing is constant until a change in the door from the open state to the closed state is detected by the door opening / closing detection unit. The seat belt device according to claim 1.   When the change of the door from the closed state to the open state is detected by the door opening / closing detection unit before the tension of the webbing becomes constant, the tension of the webbing becomes larger than the constant. The seat belt device according to claim 2, wherein the electric motor is controlled as described above.   The seat belt device according to claim 1, wherein the holding mechanism is arranged to be offset with respect to the belt reacher in an axial direction of a rotation axis of the belt reacher.

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