JP6371621B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device that makes it easy to pull a webbing by displacing a guide member that guides the webbing at the upper part of the seat.

  In the seat belt device disclosed in Patent Document 1, the webbing is inserted into the insertion hole of the reacher head attached to the tip of the first arm, and the reacher head tilts when the first arm extends forward of the seat. It is rotated as follows. However, since the reacher head is rotated by its own weight, the rotation angle of the reacher head is not stable, and the webbing may not be easily pulled to the buckle side.

JP 2010-111294 A

  In view of the above facts, an object of the present invention is to provide a seat belt device that can easily pull the webbing toward the buckle when the webbing is mounted.

The seat belt device according to claim 1, wherein a webbing for restraining an occupant extending in a vertical direction of a vehicle seat, a guide member for guiding an intermediate portion of the webbing in a longitudinal direction at an upper portion of the seat, A driving member is configured, and a rod-shaped member provided with the guide member at a tip thereof, the driving unit, a cylindrical body in which the rod-shaped member is movably inserted in the longitudinal direction of the seat, and the driving unit are configured. A drive source that moves the rod-shaped member to the front side of the seat when the webbing of the occupant seated on the seat is not mounted, and moves the rod-shaped member to the rear side of the seat when the webbing is mounted on the occupant; Constituting a driving means, provided between the rod-shaped member and the cylinder, and moving the rod-shaped member with respect to the cylinder by moving the rod-shaped member toward the front side of the sheet with respect to the cylinder; The webbing pulling angle of the guide member is directed toward the occupant side, and the rod-shaped member is moved toward the seat front side with respect to the cylinder by moving the rod-shaped member toward the seat rear side with respect to the cylinder. A guide mechanism that rotates in a direction opposite to the rotation direction .

According to the seat belt device of the first aspect, when the webbing of the occupant seated on the seat is not attached, the rod-shaped member is moved to the front side of the seat with respect to the cylinder body by the driving force of the driving source constituting the driving means. . In this manner, rod-like member is moved toward the seat forward against the cylindrical body, the rod-like member is rotated by the guide mechanism, thereby, multiply the lead angle of the webbing in the guide member provided in the rod-like member membered Directed to the side. For this reason, the amount of displacement of the guide member is stabilized. As a result, the occupant can easily pull the webbing.
Further, in this seat belt device, when the webbing is mounted on the occupant's body, the rod-shaped member is moved to the rear side of the seat with respect to the cylindrical body. Thus, when the rod-shaped member is moved to the rear side of the sheet with respect to the cylindrical body, the rod-shaped member is rotated with the rotation direction of the rod-shaped member when the rod-shaped member is moved to the front side of the sheet with respect to the cylindrical body by the guide mechanism. Is rotated in the opposite direction. As a result, the guide member is returned to the original state, so that the webbing is properly attached.
Further, in the present seat belt device, the guide member is moved to the front side of the seat when the webbing of the occupant seated on the seat is not attached, so that the occupant can easily grip the webbing.
Moreover, in this seatbelt apparatus, since the guide mechanism is provided between the cylindrical body and the rod-shaped member, the driving means can be made compact. Therefore, the installation space for the driving means can be reduced.

A seat belt device according to a second aspect is the seat belt device according to the first aspect , wherein the guide member is moved in the front-rear direction of the seat by a driving force of a single driving source provided in the driving means.

In the seat belt apparatus as claimed in claim 2, the guide member is moved to the sheet forward by the driving force of a single drive source, the lead angle of the webbing in the guide member is directed toward the passenger. For this reason, the number of parts and the cost can be reduced as compared with the case where the movement of the guide member in the front-rear direction of the sheet and the change of the webbing pull-out angle of the guide member are performed by separate drive sources.

  As described above, in the seat belt device according to the present invention, the webbing can be easily pulled to the buckle side when the webbing is mounted.

1 is a perspective view showing a configuration of a webbing retractor and a reacher device of a seatbelt device according to the present embodiment and its surroundings. It is a perspective view corresponding to FIG. 1 which shows the state which the guide member moved to the sheet | seat front side. FIG. 2 is a side sectional view mainly showing the leecher device shown in FIG. 1. It is a control block diagram of a drive means. (A) is an enlarged perspective view of a cylinder, a rod-like member, and a rotation guide showing a state in which the rod-like member is removed from the cylinder, and (B) is a cylinder showing a state where the rod-like member is accommodated in the cylinder. It is an expansion perspective view of a body, a rod-shaped member, and a rotation guide. 1 is a front view of a seat belt device according to an embodiment and a seat to which the seat belt device is applied. FIG. 7 is a perspective view corresponding to FIG. 6 illustrating a state where the guide member has moved to the front side of the sheet. FIG. 8 is a perspective view corresponding to FIG. 7 illustrating a state where the webbing is attached to the occupant's body from the state illustrated in FIG. 7 and the guide member returns to the original position.

  Next, an embodiment of the present invention will be described with reference to FIGS. In each figure, the arrow FR indicates the front side of the seat 12, the arrow LH indicates the left side when viewed from the passenger 28 seated on the seat 12, and the arrow UP indicates the upper side of the seat 12.

<Configuration of the present embodiment>
As shown in FIG. 1, the seatbelt device 10 according to the present embodiment is provided corresponding to a seating position in a bench-type seat 12 of a rear seat of a vehicle. In the present embodiment, description will be made assuming that the seat belt device 10 corresponds to the seating position on the right side of the seat 12. The seat belt device 10 includes a webbing take-up device 14. The webbing retractor 14 includes a frame 18 that is fixed to the vehicle body on the rear side of the seat back 16 of the seat 12.

  The frame 18 includes a pair of side plates 20 facing the left and right direction of the seat 12, and a spool (not shown) is rotatable between the pair of side plates 20 around an axis whose axial direction is the left and right direction of the seat 12. Is provided. A longitudinal base end portion of the webbing 22 for occupant mounting is locked to the spool, and the webbing 22 is wound and stored on the outer peripheral portion of the spool by rotating the spool in the webbing winding direction. Further, the webbing take-up device 14 includes a mainspring spring that urges the spool in the webbing take-up direction, a lock mechanism that prevents rotation of the spool in the webbing pull-out direction in the event of a vehicle emergency, and a forced webbing take-up direction in the event of a vehicle emergency. A pretensioner mechanism and the like are provided for rotation.

  The webbing 22 passes through a slit 26 formed in the upper plate 24 of the frame 18 and is drawn to the upper side of the frame 18. Further, the webbing 22 passes through the upper side of the seat back 16 on the right side of the seating position of the occupant 28 in the seat 12, and is further pulled out to the lower side of the seat 12 along the front surface of the seat back 16 as shown in FIG. Has been. The front end side of the webbing 22 passes through the side (right side) of the seat 12 and is connected to an anchor plate 32 fixed to the vehicle body below the seat cushion 30 of the seat 12. Further, a tongue 34 is provided at the intermediate portion of the webbing 22 so as to be movable in the longitudinal direction of the webbing 22. Specifically, a slit is formed in the tongue 34, and the webbing 22 passes through the slit of the tongue 34.

  A buckle 36 is provided on the left side of the seat 12 where the occupant 28 is seated. The buckle 36 is provided in a slit that vertically penetrates the seat cushion 30, and the lower end of the buckle 36 is fixed to the vehicle body below the seat cushion 30. As shown in FIG. 8, the webbing 22 is attached to the body of the occupant 28 by inserting the tongue 34 into the buckle 36 while the webbing 22 is wound around the body of the occupant 28.

  On the other hand, as shown in FIG. 1, a leecher device 40 is provided above the seat back 16 of the seat 12. As shown in FIG. 3, the leecher device 40 includes a housing 42, and a telescopic mechanism 44 is provided above the seat back 16 inside the housing 42. The telescopic mechanism 44 includes cylindrical members 46 and 48 and a rod 50 constituting a driving means as a rod-like member.

  The axial directions of the cylindrical members 46 and 48 and the rod 50 are along the front-rear direction of the seat 12. The cylindrical member 46 is supported by the housing 42, and a cylindrical member 48 that constitutes a driving unit as a cylindrical body is accommodated inside the housing movably forward of the seat 12. A rod 50 is accommodated inside the cylindrical member 48 so as to be movable forward of the seat 12, and a reacher head 52 as a guide member is fixed to the front end of the rod 50. A through hole 54 penetrating in the front-rear direction of the seat 12 is formed above the cylindrical members 46 and 48 and the rod 50 in the leecher head 52. The webbing 22 is passed through the through hole 54, and the webbing 22 extends downward along the front surface of the seat back 16 on the front side of the leecher head 52 as shown in FIG. 1.

  As shown in FIG. 3, a motor 56 constituting drive means is provided as a drive source below the telescopic mechanism 44, and a gear box 58 is provided on the side of the motor 56. A reduction gear train constituting drive means is accommodated in the gear box 58, and an output shaft of the motor 56 is connected to an input gear of the reduction gear train in the gear box 58. The leecher device 40 includes a pinion gear 60 that constitutes a driving unit. The pinion gear 60 is connected to the output gear of the reduction gear train in the gear box 58. As shown in the enlarged plan view of the pinion gear 60 and the flexible rack 70 in the circle A indicated by the one-dot chain line in FIG. 3, the driving force of the motor 56 is transmitted to the pinion gear 60 through the reduction gear train, so that the pinion gear 60 is sent out It is rotated in the direction of arrow B in FIG. 3 or in the direction of pull back (in the direction of arrow C in FIG. 3).

  As shown in FIG. 4, the motor 56 is electrically connected to a battery 64 mounted on the vehicle via a control device 62. The control device 62 is electrically connected to a courtesy switch 66 that is turned on and off as the door on the right side of the seat 12 is opened and closed, and is also electrically connected to a buckle switch 68 provided on the buckle 36. . When ON / OFF of the courtesy switch 66 corresponding to the opening of the vehicle door and the subsequent closing of the door is input to the control device 62, the motor 56 is driven by the control device 62, whereby the pinion gear 60 is moved in the delivery direction. Is rotated to. On the other hand, when the buckle switch 68 detects that the tongue 34 has been inserted into the buckle 36, the motor 56 is driven by the control device 62, whereby the pinion gear 60 is rotated in the retracting direction.

  As shown in FIG. 3, the leecher device 40 includes a flexible rack 70 that constitutes a driving means as a driving force transmission member. The flexible rack 70 is formed in a long shape that can be bent by a synthetic resin material, and the distal end of the flexible rack 70 in the longitudinal direction is fixed to the proximal end of the rod 50. Further, rack teeth are formed on one side surface of the flexible rack 70 in the width direction, and the rack teeth of the flexible rack 70 mesh with the pinion gear 60.

  When the pinion gear 60 is rotated in the feeding direction (the direction of arrow B in FIG. 3) by the normal rotation driving force output from the motor 56, the rod 50 is pressed and moved to the front side of the sheet 12 by the flexible rack 70. When the rod 50 is extended from the front end of the cylindrical member 48 for a certain length, the cylindrical member 48 is then extended from the front end of the cylindrical member 46 to the front side of the sheet 12. In contrast, when the pinion gear 60 is rotated in the retracting direction (the direction of arrow C in FIG. 3), the rod 50 is pulled to the rear side of the seat 12 by the flexible rack 70. Accordingly, the rod 50 is accommodated inside the cylindrical member 48, and the cylindrical member 48 is accommodated inside the cylindrical member 46.

  Further, the leecher device 40 includes a reel 72. The reel 72 is connected to a gear of a reduction gear train in the gear box 58, and is rotated in the drawing direction (direction of arrow D in FIG. 3) or the winding direction (direction of arrow E in FIG. 3) by the driving force of the motor 56. The When the pinion gear 60 is rotated in the delivery direction by the driving force of the motor 56, the reel 72 is rotated in the pull-out direction, and when the pinion gear 60 is rotated in the pull-back direction by the driving force of the motor 56, the reel 72 is rotated in the winding direction. Is rotated to.

  On the other hand, as shown in FIG. 5, the cylindrical member 48 of the telescopic mechanism 44 is formed with a pair of guide portions 74 constituting a driving means as a guide mechanism. The guide portion 74 is formed so as to protrude inward in the radial direction of the cylindrical member 48 by deforming a part of the cylindrical member 48 inward in the radial direction of the cylindrical member 48. These guide portions 74 are formed in a spiral shape around the central axis of the cylindrical member 48, and the guide portion 74 is displaced clockwise around the central axis of the cylindrical member 48 as it is displaced to the front side of the seat 12. doing.

  On the other hand, the guide piece 76 which comprises a guide mechanism with the guide part 74 is provided in the base end part of the rod 50 of the telescopic mechanism 44, and the outer diameter dimension of the guide piece 76 is larger than the outer diameter dimension of the rod 50. The cylindrical shape is larger and smaller than the inner diameter dimension of the cylindrical member 48. A pair of grooves 78 are formed in the outer peripheral portion of the guide piece 76, one of the pair of guide portions 74 is in one groove 78, and the other of the pair of guide portions 74 is in the other groove 78.

  For this reason, when the guide piece 76 is moved inside the cylindrical member 48 in the longitudinal direction of the cylindrical member 48, the guide piece 76 is guided by the pair of guide portions 74 and around the central axis of the cylindrical member 48 in FIGS. 5 and the arrow F in FIG. As a result, the rod 50 of the telescopic mechanism 44, and consequently the leecher head 52 fixed to the tip of the rod 50 is rotated around the central axis of the cylindrical member 48, and the end portion of the through hole 54 of the reacher head 52 on the occupant 28 side The (left end) is raised with respect to the end on the counter-occupant 28 side (right end).

<Operation and effect of the present embodiment>
When the passenger 28 gets on and off and the door of the vehicle is opened and seated on the seat 12, ON / OFF of the courtesy switch 66 accompanying the opening and closing of the door is input to the control device 62. Thus, when the motor 56 is driven by the control device 62, the pinion gear 60 is rotated in the delivery direction by the driving force of the motor 56, and the reel 72 is rotated in the pull-out direction. As a result, when the front end side of the flexible rack 70 is moved to the front side of the sheet 12, the rod 50 of the telescopic mechanism 44 is moved to the front side of the sheet 12 with respect to the cylindrical member 48.

  When the rod 50 is extended from the front end of the cylindrical member 48 for a certain length, the cylindrical member 48 is then extended from the front end of the cylindrical member 46 to the front side of the sheet 12. In this way, the rod 50 and the cylindrical member 48 are extended to the front side of the seat 12, whereby the reacher head 52 fixed to the tip of the rod 50 is moved to the front side of the seat 12 from the upper end of the seat back 16. .

  The webbing 22 is penetrated from the rear side of the seat 12 into the through hole 54 of the reacher head 52 and extends to the lower side of the seat 12 along the seat back 16. For this reason, as shown in FIG. 2, the leecher head 52 is moved to the front side of the seat 12 from the upper end of the seat back 16, so that the webbing 22 is more seated than the seat back 16 on the upper end side of the seat back 16. Moved to the front. As a result, the occupant 28 seated on the seat 12 can easily grasp the tongue 34 to mount the webbing 22.

  When the rod 50 is moved to the front side of the seat 12 with respect to the cylindrical member 48, the guide piece 76 is guided by the guide portion 74 of the cylindrical member 48 and around the central axis of the cylindrical member 48 in FIGS. 2 and 7. It is rotated in the direction of arrow F. As a result, the end portion (left end portion) of the through hole 54 of the reacher head 52 on the occupant 28 side is raised relative to the end portion (right end portion) on the counter occupant 28 side. In this manner, the through hole 54 of the leecher head 52 is tilted, so that the pulling angle of the webbing 22 from the leecher head 52 is changed. This can reduce the resistance that the webbing 22 receives from the inner peripheral portion of the through hole 54 of the reacher head 52 when the webbing 22 is pulled to the front side of the sheet 12 and to the lower left side of the sheet 12. For this reason, the passenger | crew 28 can pull out the webbing 22 to the buckle 36 side with the tongue 34, and can mount | wear with the webbing 22 easily.

  Next, the tongue 34 is inserted into the buckle 36, and when this is detected by the buckle switch 68, the motor 56 is driven in reverse by the controller 62. As a result, the pinion gear 60 is rotated in the retracting direction, and the reel 72 is rotated in the winding direction. As a result, when the leading end side of the flexible rack 70 is moved to the rear side of the sheet 12, the rod 50 of the telescopic mechanism 44 is pulled to the rear side of the sheet 12 by the flexible rack 70 and stored in the cylindrical member 48. 48 is accommodated in the cylindrical member 46. Thus, when the leecher head 52 returns to the original state together with the rod 50 and the cylindrical member 48, the webbing 22 is mounted so as to fit the body of the occupant 28.

  When the rod 50 is housed in the cylindrical member 48, the guide piece 76 is guided by the guide portion 74 of the cylindrical member 48, and the direction of the arrow F in FIGS. It is turned in the opposite direction. As a result, the end portion (left end portion) on the occupant 28 side of the through hole 54 of the reacher head 52 is lowered with respect to the end portion (right end portion) on the counter occupant 28 side, as shown in FIG. Then, the leecher head 52 returns to the original state. Thereby, the webbing 22 can be appropriately attached to the body of the occupant 28.

  Thus, in the present embodiment, the reacher head 52 is rotated together with the rod 50 by moving the rod 50 in the front-rear direction of the seat 12 by the driving force of the motor 56. For this reason, the number of parts and the cost can be reduced as compared with the case where the movement of the reacher head 52 in the front-rear direction of the seat 12 and the rotation of the reacher head 52 are performed by separate motors.

  Further, since the rotation angle of the reacher head 52 is determined by the amount of movement of the seat 12 in the front-rear direction with respect to the cylindrical member 48 of the rod 50, the rotation angle of the reacher head 52 and thus the inclination of the through hole 54 of the reacher head 52 is determined. It can be stabilized.

  In the present embodiment, the seat belt device 10 has been described as corresponding to the seating position on the right side of the seat 12. However, the seat belt device 10 is provided corresponding to the left and center seating positions of the seat 12. However, in such a case, the arrangement position of the webbing take-up device 14, the reacher device 40, and the buckle 36 may be opposite to the seating position, and the rotation direction of the reacher head 52 is also possible. May be the opposite.

  Further, in the present embodiment, the present invention is applied to the seat belt device 10 for the seat 12 as a rear seat of the vehicle. However, the present invention may be applied to other seats such as a driver seat and a passenger seat.

  Further, in the present embodiment, the reel 72 and the pinion gear 60 are configured to rotate with the same driving force of the motor 56. However, for example, the reel 72 is urged in the winding direction by the urging force of the urging means such as a spiral spring, and the pinion gear 60 that rotates by the driving force of the motor 56 resists the urging force of the urging means. It is good also as a structure which pulls out from the reel 72. FIG. In other words, the reel 72 may be rotated with a driving force different from the driving force of the motor 56 for rotating the pinion gear 60.

  In the present embodiment, the base end side of the flexible rack 70 is wound around the reel 72. However, the winding means for winding the base end side of the flexible rack 70 such as the reel 72 or the flexible rack 70 is used. It is good also as a structure which does not provide the storage means which stores the base end side of.

  Furthermore, in the present embodiment, the distal end of the flexible rack 70 is fixed to the proximal end of the rod 50, and the rod 50 is moved in the front-rear direction of the seat 12 with respect to the cylindrical member 48 by the flexible rack 70. . However, for example, the rod 50 is moved in the longitudinal direction of the sheet 12 by fixing the distal end of the wire to the proximal end of the rod 50 and moving the distal end side of the wire in the longitudinal direction of the sheet 12 by the driving force of the motor 56. The configuration for moving the rod 50 relative to the cylindrical member 48 is not limited to the flexible rack 70.

  In the present embodiment, the rod 50 is moved in the front-rear direction of the seat 12 by the driving force of the motor 56 and rotated around the central axis of the cylindrical member 48. However, the drive source for moving the rod 50 in the front-rear direction of the seat 12 and the drive source for rotating the rod 50 around the central axis of the cylindrical member 48 may be different.

  Further, in the present embodiment, the present invention is applied to the leecher device 40 in which the leecher head 52 is moved in the front-rear direction of the seat 12. For example, the webbing 22 is provided through the seatback 16. The belt guide may be configured to be rotated by a driving force of a driving unit such as a motor.

DESCRIPTION OF SYMBOLS 10 Seat belt apparatus 12 Seat 22 Webbing 48 Cylindrical member (cylinder, drive means)
50 Rod (bar-shaped member, drive means)
52 Reacher head (guide member)
56 Motor (drive source, drive means)
70 Flexible rack (drive force transmission member, drive means)
74 Guide part (guide mechanism, drive means)
76 Guide piece (guide mechanism, drive means)

Claims (2)

A webbing for restraining an occupant extending in a vertical direction of a vehicle seat;
A guide member that guides an intermediate portion of the webbing at an upper portion of the sheet so as to be movable in a longitudinal direction;
A rod-shaped member that constitutes a driving means and is provided with the guide member at a tip;
A cylindrical body that constitutes the driving means and in which the rod-like member is inserted so as to be movable in the longitudinal direction of the seat;
The drive means is configured to move the rod-like member to the front side of the seat when the webbing of the occupant seated on the seat is not attached, and the rod-like member is moved to the rear side of the seat when the webbing is attached to the occupant. A driving source to be
The drive means is provided, and is provided between the rod-shaped member and the cylindrical body, and is guided by rotating the rod-shaped member with respect to the cylindrical body by moving the rod-shaped member to the front side of the sheet with respect to the cylindrical body. The webbing pulling angle of the member is directed toward the occupant side, and the rod-shaped member is moved toward the seat front side with respect to the cylindrical body by moving the rod-shaped member toward the seat rear side with respect to the cylindrical body. Is a guide mechanism that rotates in the opposite direction;
A seat belt device comprising: The seat belt device according to claim 1 , wherein the guide member is moved in the seat front-rear direction by a driving force of a single driving source provided in the driving means.

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