WO2015093185A1 - Seat belt device - Google Patents

Abstract

[Problem] To enable a passenger to easily fasten a seat belt without twisting his body when sitting. [Solution] A seat belt device includes: a retractor device (10) configured to wind up a seat belt (2) while biasing one end of the belt toward a winding direction and to enable unwinding of the one end of the seat belt (2), while preventing the unwinding of the one end of the seat belt (2) when a predetermined condition is satisfied; a tongue (5) fitted to the seat belt (2) to engage a buckle; an arm (4) with a proximal end supported on a vehicle in such a way that the end of the arm can be swung in a front-rear direction of the vehicle, the arm having a riding position where the one end of the seat belt (2) is unwound when the arm is upright with the end of the arm being swung toward the front of the vehicle, or an alighting position where the one end of the seat belt (2) is drawn back when the arm is brought down with the end of the arm swung toward the rear of the vehicle; and a swinging device (50) that modifies the arm (4) to the riding position or the alighting position in accordance with the riding/alighting state of the passenger.

Description

Seat belt device

The present invention relates to a seat belt device for restraining an occupant.

Conventionally, in a three-point seat belt device mounted on a vehicle, one end side of the seat belt is wound up by a retractor device, and if necessary, the one end side is pulled out from the retractor device, thereby restraining an occupant.

For example, in the case of a front seat, this retractor device is disposed on the vehicle body floor near the front seat and the vehicle body center pillar.

Therefore, when pulling out the seat belt while the occupant is sitting on the front seat, it is necessary for the occupant to push out the hand backward to perform the feeding operation, which causes a problem that the feeding operation is troublesome.

Therefore, in order to facilitate the operation of extending the seat belt, after the occupant sits on the front seat, the occupant pushes his hand backward by swinging to tilt forward of the vehicle while extending one end of the seat belt. There has been known one provided with an arm that can easily perform the operation of extending the seat belt (see, for example, Patent Document 1).

JP 2008-126880 A

However, in the above conventional seat belt device, the arm has a front standing position toward the front side of the vehicle where the one end side of the seat belt is extended, and a rear standing position toward the rear side of the vehicle where the one end side of the seat belt is wound up. , Rocking.

For this reason, for example, in the case of a so-called two-door vehicle, an occupant sitting on a rear seat moves the front seat and the center pillar by moving the seat cushion forward by tilting the seat back of the front seat and sliding the seat cushion forward. We get on and off after expanding the boarding space between.

Therefore, when the arm is in the rearward standing position toward the rear side of the vehicle where the one end side of the seat belt is wound, there is a problem that the occupant gets in the way when getting on and off.

An object of the present invention is to provide a seat belt device in which an arm does not get in the way when a passenger using a rear seat gets on and off in a two-door vehicle.

In order to achieve the above object, according to the first aspect of the present invention, a predetermined condition is satisfied while the one end side of the seat belt is urged and wound in the winding direction and the one end side of the seat belt can be extended. A retractor device configured to prevent the one end side of the seat belt from being extended, a buckle connected to a stationary member of a vehicle, a tongue provided on the seat belt and engaged with the buckle, A riding position in which the base end is supported by the vehicle so that the front end thereof can swing in the front-rear direction of the vehicle, and the front end of the seat belt is extended when the front end swings and stands up toward the front side of the vehicle An arm serving as a disengagement position when one end side of the seat belt is pulled back when the front end swings backward on the vehicle and falls or when it stands up and moves to the rear of the vehicle; A rocking device to change the drop-off location and riding position the arm in response to descending state and having a.

The seat belt device of the present invention is configured such that when a predetermined condition is satisfied while the one end side of the seat belt is urged and wound in the take-up direction by the retractor device and the one end side of the seat belt can be extended. The seat belt is provided with a tongue that is prevented from being fed out on one end side of the belt and engages with a buckle connected to a stationary member of the vehicle.

Here, the seat belt device of the present invention is provided with an arm that can swing in the front-rear direction of the vehicle in order to facilitate the belt mounting operation of the occupant.

The base end of this arm is supported by the vehicle so that the front end of the arm can swing in the longitudinal direction of the vehicle. In addition, the arm is set to the riding position where the end of the seat belt is extended when the front end of the arm swings to the front side of the vehicle by the swinging device, and the front end swings backward to the vehicle. When the vehicle is raised or stood up and moved to the rear of the vehicle, the one end side of the seat belt is pulled back to the disengagement position.

This allows the arm to stay out of the way when the occupant gets on and off, so that the arm does not get in the way.

According to a second invention, there is provided a boarding / exiting sensor for detecting or predicting an occupant's boarding / alighting state according to the first invention, wherein the swing device detects the occupant's boarding when the boarding / exiting sensor detects or predicts boarding of the occupant It is characterized in that when the getting-on / off sensor detects or predicts the passenger getting off, the arm is lowered to the getting-off position.

Thus, for example, when the occupant gets on or off the arm, the arm is lying behind the vehicle, and when detecting that the occupant gets on the arm, the arm stands up in front of the vehicle while extending one end side of the seat belt. be able to.

A third invention includes the door sensor for detecting opening / closing of a vehicle door according to the first invention, wherein the swing device stands up at the boarding position when the door sensor detects the closing of the vehicle door, When the door sensor detects the opening of the vehicle door, the arm is laid down to the dismounting position.

Thus, when the door is opened, the occupant can get on and off as if the occupant gets on and off, and when the door is closed, the arm can be raised up as if the occupant is sitting on the seat.

According to a fourth aspect of the present invention, in the third aspect of the invention, the swing sensor includes a seat sensor that detects that the occupant is seated on the seat, and the swing device moves the arm to the riding position when the seat sensor detects the occupant's seating. It is characterized by standing.

This allows the arm to stand up in front of the vehicle after the occupant is seated on the seat.

A fifth invention is characterized in that, in the fourth invention, the swing device does not operate when the seat sensor does not detect the seating of an occupant even if the door sensor detects the closing of the vehicle door. To do.

This makes it possible to prevent the arm from standing when the occupant is not sitting on the seat.

According to a sixth aspect of the present invention, in the first to fifth aspects of the invention, the swinging device includes a rotating body that engages with the arm and swings the arm within a predetermined range, and one end is held by the rotating body. A spring having the other end held by an arm, and the retractor device transmits a drive of the motor to the rotating body, the motor winding the one end side of the seat belt, and the motor is connected to the seat belt. A clutch that releases the drive of the motor to the rotating body when the winding of the one end side is completed, and the arm swings when the winding of the one end side of the seat belt by the motor is completed. It is in the winding completion position inclined toward the rear side of the vehicle with respect to the moving fulcrum, and is laid down to the dismounting position by releasing the clutch and urging the spring.

This makes it possible to swing the arm by partially using the drive of the seat belt retractor motor of the retractor device.

According to the present invention, it is possible to prevent the arm from getting in the way when a passenger using a rear seat gets on and off in a two-door vehicle.

It is the conceptual diagram which showed the action | operation of the seatbelt apparatus of one Embodiment of this invention, and is the figure which showed the state which mounted | wore the seatbelt. It is the figure which showed the state in the middle of the state which removed the seatbelt. It is the figure which showed the state where the passenger | crew is not sitting on the seat. It is a disassembled perspective view showing the detailed structure of a retractor. It is a disassembled perspective view of a part of retractor. It is a disassembled perspective view of a part of retractor. It is a front view which shows a power transmission mechanism, and has shown the state in which power transmission is possible by a clutch mechanism. It is a front view which shows a power transmission mechanism, and has shown the state by which the transmission of power is interrupted | blocked by the clutch mechanism. 1 is a front view of a swing mechanism that shows a seat belt device according to an embodiment of the present invention and swings an arm back and forth of a vehicle. 1 shows a seat belt device according to an embodiment of the present invention and is a cross-sectional view of a swing mechanism. It is explanatory drawing of the boarding position which showed the effect | action of the arm in the seatbelt apparatus of one Embodiment of this invention, and the front-end | tip stood up ahead of the vehicle. It is explanatory drawing in the middle of the effect | action of the arm in the seatbelt apparatus of one Embodiment of this invention, and the front-end | tip returning from the front of a vehicle. It is explanatory drawing of the seat belt winding completion position which shows the effect | action of the arm in the seatbelt apparatus of one Embodiment of this invention at the time of arm return. It is explanatory drawing of the alighting position which showed the effect | action of the arm in the seatbelt apparatus of one Embodiment of this invention, and the front-end | tip rock | fluctuated and fell down. It is explanatory drawing just after the arm rocking | fluctuation start which shows the effect | action of the arm in the seatbelt apparatus of one Embodiment of this invention, and the front-end | tip is back from the vehicle forward. It is explanatory drawing in the middle of the arm rocking | fluctuation which shows the effect | action of the arm in the seatbelt apparatus of one Embodiment of this invention, and the front-end | tip is back from the vehicle forward. FIG. 5 is an explanatory diagram of a seat belt retracting completion position when the arm swings, showing the action of the arm in the seat belt device of the embodiment of the present invention. It is the conceptual diagram which showed the action | operation of the seatbelt apparatus of the modification 1 of one Embodiment of this invention. It is the conceptual diagram which showed the action | operation of the seatbelt apparatus of the modification 2 of one Embodiment of this invention. It is the conceptual diagram which showed the action | operation of the seatbelt apparatus of the modification 3 of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 are conceptual diagrams showing the operation (details will be described later) of the seat belt in the seat belt device according to the present invention. FIG. 1 is a view showing a state in which a seat belt is mounted, FIG. 2 is a view showing a state in the middle of removal of the seat belt, and FIG. 3 is a view in which a passenger P is not sitting on the seat. FIG.

1 to 3, the seat belt device has a retractor device 10 that is located on the outside of the vehicle body of the seat 1 and is installed on a floor panel or the like. Then, the seat belt 2 is wound around the retractor device 10. The pay-out part of the seat belt 2 is stretched over a through anchor 3 installed on the upper part of a center pillar or the like, folded back there, and guided downward. And the front-end | tip of the folding | returning part 2a of this seatbelt 2 is located in the one side of the seat 1, and is latched by the arm 4 rotatably installed in the floor panel etc. A tongue 5 is slidably attached to the folded portion 2 a of the seat belt 2. On the other hand, a buckle (not shown) is installed on the floor panel or the like, positioned on the other side of the seat 1. The occupant P is restrained by the seat 1 by attaching the tongue 5 of the seat belt 2 to the buckle. In the seat belt device of the present embodiment, although not shown, a door sensor that detects that the front door of the vehicle is opened, a seat sensor that detects that the occupant P is seated on the seat 1, and a tongue 5 are provided. And a buckle sensor for detecting that the buckle is attached / detached. Each of these sensors functions as a boarding / alighting sensor that detects or predicts the boarding / alighting state of the passenger P.

4 to 6 are perspective views showing the retractor device 10, FIG. 4 is an exploded perspective view showing the overall structure, and FIGS. 5 and 6 are partially extracted enlarged views of FIG.

The frame 12 of the retractor device 10 is formed in a U shape by a pair of parallel side walls 12a and 12b and a back wall 12c connecting them. The side walls 12a and 12b of the frame 12 are formed with large-diameter holes 12d and 12e.

A first retainer 13, a cover 14, a spring case 15, and a pretensioner cassette 16 are attached in this order to the outer surface of the side wall 12a of the frame 12, and a second retainer 17 is attached to the outer surface of the side wall 12b. Established.

On the other hand, the reel 11 of the retractor device 10 has a cylindrical shape with one end closed. In the center of the closed end surface of the reel 11, a shaft 18 is provided outward. As shown in FIG. 5, the shaft 18 includes a large-diameter shaft portion 18a, a medium-diameter shaft portion 18b, and a small-diameter shaft portion 18c. Splines are formed in the large-diameter shaft portion 18a and the medium-diameter shaft portion 18b.

Further, the retractor device 10 includes a torsion bar 19 that constitutes a force limiter mechanism A. One end of the torsion bar 19 is fixed with a locking base 20 that constitutes one of the components of an emergency lock mechanism B described later. The tip 19 a of the torsion bar 19 is inserted from the opening of the reel 11. The tip 19a is integrally connected to the closed end of the reel 11.

Further, the locking base 20 is formed with a shaft 21 extending on the opposite side to the torsion bar 19.

The reel 11 is positioned between the side wall 12a and the side wall 12b of the frame 12. The shaft 18 is rotatably supported by the pretensioner cassette 16 with a small diameter shaft portion 18c. The shaft 21 is rotatably supported by the second retainer 17.

A motor 22 is supported on the first retainer 13. This motor 22 is for forcibly driving the reel 11. The drive shaft 22 a of the motor 22 is linked to the shaft 18 of the reel 11 by the power transmission mechanism C.

The power transmission mechanism C includes a planetary gear mechanism that is accommodated in a large-diameter hole 13 a formed in the first retainer 13. The planetary gear mechanism includes three planetary gears 23, and these planetary gears 23 are rotatably supported on the peripheral edge of the side surface of the carrier 24. A spline hole 24 a is formed at the center of the carrier 24. The spline hole 24a is engaged with the spline of the large-diameter shaft portion 18a of the reel 11. The planetary gears 23 are meshed with internal teeth 25 a of the internal gear 25 so as to surround the planetary gears 23. The sun gear 26 is rotatably held by the large-diameter shaft portion 18 a of the reel 11 and meshed with the planetary gear 23. The sun gear 26 is integrally engaged with the center hole 27 a of the large-diameter gear 27. The outer teeth 27b of the large-diameter gear 27 drive the motor 22 via an intermediate gear 28 that is rotatably supported by the first retainer 13 and a connect gear 29 that is rotatably supported by the first retainer 13. The motor gear 30 is fixed to the shaft 22a.

In this power transmission mechanism C, a clutch mechanism D is interposed. The clutch mechanism D selectively cuts off power transmission from the motor 22 to the reel 11. As shown in FIG. 6, the clutch mechanism D includes a spring holding member 31, a lever spring 32, and the like attached to the side surface of the connect gear 29. On the peripheral surface of the spring holding member 31, a protrusion having a groove 31b is formed. The spring holding member 31 is attached to the side surface of the connect gear 29 by a pin 31a. The lever spring 32 includes a curved portion 32a at one end. The lever spring 32 is rotatably supported by the spring holding member 31 by inserting the curved portion 32a so as to fit into the groove 31b of the spring holding member 31. A locking lever 33 is disposed at the tip of the lever spring 32. The locking lever 33 has a claw 33a at the tip. The claw 33 a is positioned so as to face the external teeth 25 b formed on the peripheral surface of the internal gear 25.

7 and 8 are sectional views for explaining the operation of the power transmission mechanism C. FIG. The power transmission mechanism C includes a retractor device 10. As shown in FIG. 7, when the drive shaft 22 a of the motor 22 is rotated in the seat belt winding direction (CCW direction), the power is transmitted to the connect gear 29 via the motor gear 30. Thereby, the connect gear 29 is rotated in the CCW direction. When the connect gear 29 rotates in the CCW direction, the locking lever 33 is operated via the lever spring 32, and the claw 33a of the locking lever 33 engages with the external teeth 25b of the internal gear 25.

On the other hand, the rotation of the connect gear 29 is transmitted to the planetary gear 23 via the intermediate gear 28, the large diameter gear 27, and the sun gear 26.

In this case, the internal gear 25 is prevented from rotating by the claw 33a of the locking lever 33. For this reason, the planetary gear 23 revolves while rotating along the internal teeth 25a of the internal gear 25. Accordingly, the carrier 24 is rotated, and the reel 11 is rotated in the seat belt winding direction (CCW direction) via the shaft 21. Therefore, the seat belt 2 is forcibly wound up.

When the motor 22 is driven and the drive shaft 22 a is rotated in the seat belt feeding direction (CW direction) as shown in FIG. 8, the power is transmitted to the connect gear 29 via the motor gear 30. Thereby, the connect gear 29 is rotated in the CW direction. When the connect gear 29 rotates in the CW direction, the locking lever 33 is operated via the lever spring 32, and the claw 33 a of the locking lever 33 is separated from the external teeth 25 b of the internal gear 25.

On the other hand, the rotation of the connect gear 29 is transmitted to the planetary gear 23 via the intermediate gear 28, the large diameter gear 27, and the sun gear 26.

In this case, the claw 33a of the locking lever 33 is separated from the external tooth 25b of the internal gear 25, so that the internal gear 25 is rotatable. For this reason, the planetary gear 23 rotates the internal gear 25 without being revolved. Therefore, the carrier 24 is not rotated and the reel 11 is not rotated.

Further, the retractor apparatus 10 includes a spring mechanism E that urges the reel 11 in the seat belt winding direction (CCW direction) at the normal time. The spring mechanism E biases the seat belt 2 in the direction to wind the reel 11. The spring mechanism E holds the seat belt 2 in an unloaded state, that is, when the seat belt 2 is not used. The spring mechanism E always brings the seat belt 2 into contact with the occupant P with a weak tension when the seat belt 2 is used. The spring mechanism E restrains the occupant P so that the seat belt 2 can be easily extended when the occupant P moves the upper body forward.

The spring mechanism E is provided with a return spring 34 made of a spring. The return spring 34 is accommodated between the cover 14 and the spring case 15. The return spring 34 is engaged with a bush 35 whose inner end 34 a is splined to the medium diameter shaft portion 18 b of the reel 11, and the outer end 34 b is locked to the inner peripheral surface of the spring case 15.

Further, the retractor device 10 includes a lock mechanism F. When the seat belt 2 is about to be pulled out suddenly during braking or the like, the lock mechanism F immediately regulates the extension of the seat belt 2 to prevent the occupant P from hitting a front obstacle or the like. Suppress.

The lock mechanism F is constituted by a lock gear 36, a flywheel 37, and ratchet teeth 17a formed on the second retainer 17.

The flywheel 37 has a claw 37 a at the tip, and a base end is rotatably supported on the side surface of the lock gear 36. The flywheel 37 is biased inward in the radial direction of the lock gear 36 by a spring 38 disposed between the flywheel 37 and the lock gear 36. The claw 37a is in a state of being separated from the ratchet teeth 17a of the second retainer 17 by this urging.

In the lock mechanism F, for example, when braking is performed and the seat belt 2 is suddenly pulled out and the reel 11 is rotated in the belt pull-out direction (CW direction), the lock gear 36 is also rotated suddenly. . At this time, the flywheel 37 cannot follow the rotation of the lock gear 36 and is moved against the urging force of the spring 38. As a result, the claw 37 a engages with the ratchet teeth 17 a of the second retainer 17. As a result, the lock gear 36 is prevented from rotating, and accordingly, the reel 11 is prevented from rotating in the belt drawing direction (CW direction). Therefore, further extension of the seat belt 2 is restricted.

When the braking is released, the flywheel 37 returns to the original state, and the claw 37a is separated from the ratchet teeth 17a of the second retainer 17. Accordingly, the reel 11 is unlocked.

The emergency lock mechanism B operates even when the vehicle is decelerated at the time of a collision, for example, and the occupant P is about to protrude forward of the vehicle body. At that time, the occupant P is restrained to the seat by preventing the seat belt 2 from being extended.

The emergency lock mechanism B includes a deceleration detecting means 39, a pawl 40 supported by the locking base 20, ratchet teeth 41 formed on the inner surface of the large diameter hole 12e of the side wall 12b of the frame 12.

The deceleration detection means 39 includes a lever 39a and a claw 39b at the tip of the lever 39a. The deceleration detection means 39 is installed on the outer surface of the side wall 12 b of the frame 12, and the claw 39 b is positioned to face the ratchet teeth 36 a of the lock gear 36.

The pawl 40 includes a cam follower 40a protruding toward the lock gear 36 on the side surface of the tip. The pawl 40 includes a claw 40b at the tip. And this pawl 40 is supported by the side surface of the locking base 20 so that rotation is possible at the base end. The cam follower 40 a is inserted into a cam groove 36 b formed on the side surface of the lock gear 36. The claw 40 b is positioned to face the ratchet teeth 41. A spring 41 </ b> A is interposed between the pawl 40 and the locking base 20, whereby the pawl 40 b of the pawl 40 is positioned away from the ratchet teeth 41.

According to the emergency lock mechanism B configured in this way, when the vehicle suddenly decelerates, the lever 39a of the deceleration detection means 39 is actuated, and the claw 39b engages with the ratchet teeth 36a of the lock gear 36.

On the other hand, when the vehicle decelerates suddenly and a load on the front of the vehicle body is generated on the occupant P, the seat belt is extended and the reel 11 is rotated in the belt drawing direction (CW direction). Along with this, the locking base 20 is rotated via the torsion bar 19. However, since the lock gear 36 is prevented from rotating by the lever 39a of the deceleration detecting means 39, the cam follower 40a of the pawl 40 is operated. Thereby, the pawl 40 b of the pawl 40 is engaged with the ratchet teeth 41. Therefore, the locking base 20 is prevented from rotating, and accordingly, the reel 11 is prevented from rotating and the seat belt 2 is prevented from being pulled out.

In this way, the occupant P is restrained by the seat by preventing the seat belt 2 from being pulled out against the sudden deceleration of the vehicle. At that time, when an excessive restraining force is applied to the occupant P, the restraining force is relaxed by twisting the torsion bar 19 constituting the force limiter mechanism.

FIG. 9 is a front view of a swinging mechanism that swings the arm 4 back and forth (left and right in the drawing) of the vehicle, and FIG. 10 is a cross-sectional view of the swinging mechanism.

9 and 10, the swing device 50 includes a base 51, an arm 4 that holds the folded portion 2 a of the seat belt 2 at the tip, and a swing shaft 52 that serves as a swing support point that supports the other end of the arm 4. And a rotating body 53 having a driven-side protrusion 53a that engages with a driving-side protrusion 4a provided at the other end of the arm 4, and a support protrusion 4b that is held at one end by the rotating body 53 and protrudes from the middle part of the arm 4. A spring 54 having the other end held therein, and a tension spring 56 spanned between the swing shaft 52 and the rotation shaft 55 of the rotating body 53 are provided.

The base 51 is integrally formed with a pair of restricting protrusions 51a and 51b for restricting the moving range of the driven side protrusion 53a, that is, the rotating range of the rotating body 53, and a restricting groove 51c where the rotating shaft 55 is located. . The base 51 is fixed to a vehicle body panel (not shown) or the like, and supports the swing shaft 52.

The rotating body 53 is integrally provided with a driven-side protrusion 53 a that protrudes in the radial direction from the peripheral surface, a support protrusion 53 b that supports one end of the spring 54, and a rotating shaft 55.

Next, the operation of the rocking device 50 will be described with reference to FIGS.

In a state where the occupant P is sitting on the seat 1, as shown in FIG. 9 and FIG. Therefore, the spring 54 is on the front side of the vehicle with respect to the swing shaft 52, and the driving side protrusion 4a and the driven side protrusion 53a are in a disengaged state. Further, the rotation shaft 55 is positioned above the restriction groove 51 c by the biasing force of the tension spring 56. The driven projection 53a is in contact with the regulation projection 51a on the vehicle rear side.

Next, after the buckle sensor detects that the tongue 5 is detached from the buckle, when the door sensor detects that the front door of the vehicle is opened, the motor 22 is driven to start the winding of the seat belt 2. The

As a result, as shown in FIG. 12, the arm 4 starts swinging toward the rear of the vehicle, the drive side protrusion 4a engages with the driven side protrusion 53a, and the rotating body 53 rotates in the counterclockwise direction shown in the figure. Let At the same time, the rotating body 53 is rotated until the driven-side protrusion 53a contacts the other restricting protrusion 51b.

2 and 13, when the seat belt 2 is further wound and reaches the winding completion position, the driven side protrusion 53a rides on the peripheral surface of the driving side protrusion 4a. At the same time, the rotary shaft 55 moves to the lower side of the restricting groove 51c against the biasing force of the tension spring 56.

Furthermore, in this state, the clutch mechanism D is in the released state and the support protrusion 53b is located on the vehicle rear side with respect to the rotating shaft 55.

As a result, as shown in FIG. 3 and FIG. 14, by the bias of the spring 54, the arm 4 rotates to the rear side of the vehicle and becomes a descending position. At the same time, the rotary shaft 55 is moved back to the upper side of the restriction groove 51 c by the urging of the tension spring 56. Thereby, even if the vehicle is a two-door vehicle and the seat 1 is moved to the front of the vehicle using the walk-in mechanism, the state in which the arm 4 remains standing in the open space between the seat 1 and the center pillar is is not. Accordingly, it is possible to suppress the arm 4 from hindering passengers from getting on and off the vehicle.

When the door sensor detects the opening of the front door and the seat sensor detects the seating of the occupant P, the motor 22 is driven and the clutch mechanism D is connected. Thereby, as shown in FIG. 15, the reel 11 starts to wind up the seat belt 2. At the same time, the driving side protrusion 4a engages with the driven side protrusion 53a to rotate the rotating body 53 in the clockwise direction in the figure.

Then, as shown in FIG. 16, the rotating body 53 rotates until the driven-side protrusion 53a contacts one of the restricting protrusions 51a. Thereafter, as shown in FIG. 17, when the seat belt 2 returns to the winding completion position, the driven side protrusion 53 a rides on the peripheral surface of the driving side protrusion 4 a and the rotating shaft 55 is biased by the tension spring 56. Accordingly, it moves to the lower side of the regulation groove 51c. Further, in this state, the clutch mechanism D is in a released state, and the support protrusion 53b is positioned on the vehicle front side with respect to the rotation shaft 55.

As a result, as shown in FIGS. 1 and 11, the arm 4 is rotated to the front side of the vehicle by the urging of the spring 54 to be in the riding position, and the rotating shaft 55 is restricted by the urging of the tension spring 56. Move back to the upper side of the groove 51c. Further, the clutch mechanism D is released, and the arm 4 swings from the position shown in FIG. 17 to the position shown in FIG. The operation position of the seat belt 2 by the occupant can be on the front side of the occupant.

As described above, the seat belt device of the present embodiment urges and winds one end of the seat belt 2 in the take-up direction and allows the one end of the seat belt 2 to be fed out while satisfying a predetermined condition. A retractor device 10 configured to prevent the one end side of the seat belt 2 from being extended, a buckle connected to a stationary member of the vehicle, a tongue 5 provided on the seat belt 2 and engaged with the buckle. And the base end is supported by the vehicle so that the front end of the vehicle can swing in the front-rear direction of the vehicle, and the end of the seat belt 2 is extended when the front end swings and stands up toward the front side of the vehicle. Position, the arm 4 as a dismounting position in which one end side of the seat belt 2 is pulled back when the front end swings backward and the vehicle falls, and the arm 4 is disposed in the disengaging position and the dismounting position according to the passenger's getting-in / out state. Having, a swing device 50 to change and.

Further, the swinging device 50 includes a rotating body 53 that engages with the arm 4 and swings the arm 4 within a predetermined range, a spring 54 having one end held by the rotating body 53 and the other end held by the arm 4, The retractor device 10 includes a motor 22 that winds up one end side of the seat belt 2, and transmits the drive of the motor 22 to the rotating body 53, and the motor 22 completes winding of the one end side of the seat belt 2. A clutch mechanism D for releasing the drive of the motor 22 to the rotating body 53, and the arm 4 is a swing shaft 52 that is a swing fulcrum when the winding of the one end side of the seat belt 2 is completed by the motor 22. The vehicle is in the winding completion position inclined toward the rear side of the vehicle, and falls to the dismounting position by releasing the clutch mechanism D and urging the spring 54.

Thus, when the occupant P is seated on the seat 1 and the front door is closed, the seating / door closing is detected by each sensor, the motor 22 is driven, the clutch mechanism D is released, and the tip of the arm 4 is moved. The seat belt 2 is extended in the extending direction while standing up to the boarding position.

On the other hand, when the occupant P disengages the tongue 5 from the buckle to open the vehicle and opens the front door, the motor 22 is driven to rotate the reel 11 in the winding direction. Then, the clutch mechanism D is in a connected state. As a result, the front end of the arm 4 starts swinging toward the rear of the vehicle, the clutch mechanism D is released at a predetermined position (FIG. 13), and the arm 4 is laid down by the bias of the spring 54, thereby causing one end of the seat belt 2 to move. It can be set as the getting-off position with the side pulled back.

In the above embodiment, the operation of the arm 4 includes the door sensor 60 for detecting the opening of the door, the seat sensor 61 for detecting that the occupant P is seated on the seat 1, and the tongue 5 being detached from the buckle. Control is performed based on the detection signal of the buckle sensor 62 to be detected. However, the present invention is not limited to such control, and various modifications can be made without departing from the spirit and technical idea thereof. Hereinafter, such modifications will be described.

(1) The swinging device is composed of a rhombus plate. For example, as shown in FIG. 18, a guide groove 42 is formed in the arm 4 along the extending direction, and a shaft 43 that can be displaced in the guide groove 42 is a spring 44. , 45 and a diamond plate 46 that engages with the shaft 43 is disposed.

Thereby, the shaft 43 may go around each side of the rhombus plate 46, and the swing position of the arm 4 may be switched depending on the position of the shaft 43.

(2) Displacement of the arm 4 only by the winding force of the retractor device 10 For example, as shown in FIG. 19 or FIG. 20, the through anchor 3 is attached to the rear of the vehicle relative to the seat 1, and the arm 4 is movable in the longitudinal direction of the vehicle. The arm 4 may be moved toward the rear of the vehicle only by the retracting force of the retractor device 10 when the occupant P gets on and off.

In this embodiment, a rail 57 that extends in the longitudinal direction of the vehicle and allows the displacement of the arm 4 in the longitudinal direction of the vehicle, a rail spring 58 that biases the arm 4 in the pushing direction forward of the vehicle, and the tip of the arm 4 And a spiral spring 59 that urges the lever in the direction of swinging toward the vehicle rear side.

At the time of boarding, the clutch mechanism D is OFF, and the arm 4 and the spiral spring 59 are pushed forward by the pushing biasing force of the rail spring 58. Further, the arm 4 is erected on the vehicle front side by a spiral spring 59. The force obtained by adding the urging force of the spiral spring 59 and the urging force of the rail spring 58 is set larger than the belt winding force.

When the front door is opened, the retractor device 10 is activated, and the seat belt 2 moves the arm 4 and the spiral spring 59 along the rail 57 to the rear of the vehicle. At this time, the urging force of the spiral spring 59 and the urging force of the rail spring 58 are smaller than the belt winding force.

On the other hand, when the front door is closed, the retractor device 10 is actuated again, the arm 4 and the spiral spring 59 are wound up by the seat belt 2, and the clutch mechanism D is released to return to the normal position.

In the case shown in FIG. 19, by supporting the middle part of the seat belt 2 with the tip of the arm 4, the seat belt 2 is fed out and pulled back so that the middle part is at the top.

On the other hand, in the case shown in FIG. 20, the other end of the seat belt 2 is supported by the tip of the arm 4 so that the seat belt 2 is extended and pulled back so that the arm 4 becomes an outer anchor.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat belt 4 Arm 5 Tongue 10 Retractor device 22 Motor 50 Oscillating device 52 Oscillating shaft (oscillating fulcrum)
53 Rotating body 54 Spring D Clutch mechanism

Claims (6)

When the one end side of the seat belt (2) is urged and wound in the take-up direction and the one end side of the seat belt (2) is enabled, the seat belt (2 ) One end side of the retractor device (10) configured to prevent the extension,
A buckle connected to a fixed side member of the vehicle;
A tongue (5) that is provided on the seat belt (2) and engages with the buckle, and a base end thereof is supported by the vehicle so that the front end of the tongue (5) can swing in the front-rear direction of the vehicle. When the seat belt (2) is swung to the side and stood up, one end side of the seat belt (2) is set to the riding position, and when the front end swings to the rear of the vehicle and falls down or stands and moves to the rear of the vehicle. An arm (4) that is at a dismounting position where one end side of the seat belt (2) is pulled back;
An oscillating device (50) for changing the arm (4) to a boarding position and a boarding position according to a passenger boarding / alighting state;
A seat belt device comprising: The seat belt device according to claim 1, wherein
With a boarding / exiting sensor that detects or predicts the boarding / exiting state of the passenger
The rocking device (50)
When the boarding / exiting sensor detects or predicts the boarding of an occupant, the arm (4) is raised at the boarding position,
The seat belt device according to claim 1, wherein when the getting-on / off sensor detects or predicts the passenger getting off, the arm (4) is laid down to the getting-off position. The seat belt device according to claim 1, wherein
It has a door sensor that detects the opening and closing of the vehicle door,
The rocking device (50)
When the door sensor detects the closing of the vehicle door, the arm (4) is raised to the riding position,
The seat belt device according to claim 1, wherein when the door sensor detects the opening of the vehicle door, the arm (4) is laid down to the dismounting position. The seat belt device according to claim 3,
It has a seat sensor that detects that the occupant is seated on the seat,
The rocking device (50)
The seat belt device according to claim 1, wherein when the seat sensor detects the seating of an occupant, the arm (4) is erected at a riding position. The seat belt device according to claim 4, wherein
The rocking device (50)
Even if the door sensor detects the closing of the vehicle door, the seat belt device does not operate when the seat sensor does not detect the seating of an occupant. The seat belt device according to any one of claims 1 to 5,
The rocking device (50)
A rotating body (53) that engages with the arm (4) and swings the arm (4) within a predetermined range;
A spring (54) having one end held by the rotating body (53) and the other end held by the arm (4);
With
The retractor device (10)
A motor (22) that winds up one end of the seat belt (2);
When the drive of the motor (22) is transmitted to the rotating body (53) and the motor (22) completes winding of one end side of the seat belt (2), the rotating body (53) is moved to the rotating body (53). A clutch (D) for releasing the drive of the motor (22),
The arm (4) is in a winding completion position inclined to the rear side of the vehicle with respect to the swing fulcrum when the winding of the one end side of the seat belt (2) is completed by the motor (22), The seat belt device according to claim 1, wherein the seat belt device falls to a dismounting position by releasing the clutch (D) and urging the spring (54).

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