JP2015171833A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device which enables a pretensioner to promptly and effectively apply a tensile force required during emergency to a seat belt while further improving tongue gripping easiness and user's easiness of getting on/off a vehicle.SOLUTION: In a seat belt device, a tip part 4c of a seat belt 4 is guided by a belt guide 10 which is provided so as to rotate between a belt retraction position and a belt attachment position and the tip part 4c is connected with a pretensioner 8. The tip part 4c of the seat belt 4, which is located between the belt guide 10 and the pretensioner 8, slidably penetrates into a belt flat surface direction control hole 12a of a belt flat surface direction control member 12. A direction of a flat surface of the tip part 4c of the seat belt 4 is smoothly changed by the belt flat surface direction control member 12 and then the tip part 4c is connected with the pretensioner 8.

Description

  In the present invention, the seat belt (the seat belt) is pulled by pulling the lap belt of the seat belt at an early stage of an emergency (hereinafter simply referred to as an emergency) when a deceleration larger than a normal deceleration is applied to the vehicle. In particular, the present invention belongs to the technical field of a seat belt apparatus including a pretensioner that increases the restraining force of an occupant by a lap belt.

  Conventionally, in a three-point seat belt device installed in a vehicle such as an automobile, the tongue is slidably supported by the seat belt pulled out from the seat belt retractor, and the tongue is engaged with the buckle. Thus, the seat belt is attached to the occupant, and the occupant is restrained by the attached seat belt in the initial stage of an emergency. In this case, the seat belt that restrains the occupant is divided into a shoulder belt that restrains the shoulder and chest of the occupant and a lap belt that restrains the occupant's waist.

  By the way, in the conventional seat belt apparatus, in the initial stage of an emergency, a seat provided with a pretensioner that quickly removes the slack of the seat belt and applies tension to the seat belt to increase the restraining force of the occupant by the seat belt. Various belt devices have been developed. As a pretensioner used in such a seat belt device, a lap pretensioner for applying tension to the seat belt by pulling the lap belt of the seat belt with, for example, pressure gas generated by a gas generator has been proposed. (For example, refer to Patent Document 1).

  The lap pretensioner described in Patent Document 1 is a gas generator that generates gas in an emergency, a cylinder in which the longitudinal direction is the front-and-rear direction of the vehicle, and a cylinder into which the gas generated by the gas generator is introduced. A piston that is airtight and slidably disposed and operated by a gas introduced into the cylinder, a main body provided with the gas generator and the cylinder, and a front end portion of the seat belt drawn from the seat belt retractor (that is, It has a connecting member made of a wire that connects the one end of the lap belt and a piston in the cylinder, and a cover that is rotatably provided on the main body and covers the connecting member.

  When the seat belt is not attached, the seat belt is retracted to the maximum extent by the seat belt retractor. At this time, the cover of the lap pretensioner is almost side of the seat back portion of the vehicle seat or the seat back portion. It does not extend in the direction of the seat part of the vehicle seat that is slightly rearward and is rotated in substantially the same direction as the direction of the seat back part and the occupant is seated. Further, after the occupant is seated on the seat portion of the vehicle seat, the lap pretensioner cover is rotated forward of the vehicle seat by pulling it out of the seat belt retractor and moving the tongue forward of the vehicle seat. Extend towards. As a result, the occupant can easily grip the tongue and move it more smoothly toward the buckle located on the opposite side in the left-right direction with respect to the position of the lap pretensioner and the vehicle seat. By combining, the seat belt is attached to the occupant.

In the seat belt device described in Patent Document 1, as described above, when the seat belt is not attached, the cover of the lap pretensioner is substantially at the side of the seat back portion of the vehicle seat or slightly behind the seat back portion and the seat back portion. Therefore, the seat belt pulled out from the seat belt retractor is also located substantially on the side of the seat back portion or slightly behind the seat back portion. For this reason, when the seat belt is not attached, the tongue is positioned substantially on the side of the seat back portion of the vehicle seat or slightly behind the seat back portion. However, if the tongue is positioned at the position when the seat belt is not worn, there is a problem that it is difficult for the occupant to grip the tongue to wear the seat belt.

  Therefore, even when the seatbelt is retracted to the maximum extent by the seatbelt retractor when the seatbelt is not attached, the tongue is positioned in front of the seatback portion of the vehicle seat and above the seat portion of the vehicle seat. Can be considered. Thus, when a tongue is located in the said position, a passenger | crew becomes possible [grasping a tongue easily]. However, if the tongue is positioned at the position when the seat belt is not attached, the portion of the seat belt on which the tongue is supported is also positioned at the position. When the tongue and the portion of the seat belt on which the tongue is supported are located in this position, when the passenger gets on and off the vehicle, it becomes an obstacle and the passenger is difficult to get on and off the vehicle. Occurs.

  In addition, a seat belt device has been proposed that improves both the ease of tongue gripping and the ease of getting on and off the vehicle when the seat belt is mounted (see, for example, Patent Document 2). In the seat belt device described in Patent Document 2, a belt guide member that guides a part of the lap belt of the seat belt pulled out from the seat belt retractor is rotatably provided. When the seat belt is not attached, the belt guide member is set to the inoperative position by the biasing force of the spring. In the non-operating position of the belt guide member, the seat belt and the tongue are located substantially on the side of the seat back part or slightly behind the seat back part. As a result, when the passenger gets on and off the vehicle, the seat belt and the tongue do not get in the way, and the ease of getting on and off the passenger is improved. Further, when the occupant is seated on the seat portion and intends to attach the seat belt, the belt guide member is rotated by a driving device such as a motor and set to the operating position. In the operating position of the belt guide member, the tongue is positioned in front of the seat back portion of the vehicle seat and above the seat portion of the vehicle seat. As a result, the occupant can easily grip the tongue when trying to wear the seat belt, and the ease of gripping the tongue by the occupant is improved.

  On the other hand, there has been proposed a seat belt device including a buckle pretensioner that applies tension to the seat belt by pulling the buckle with, for example, pressure gas generated by a gas generator in an early stage of an emergency (see, for example, Patent Document 3). ). The buckle pretensioner described in Patent Document 3 is a gas generator that generates gas in an emergency, a cylinder that is disposed so that the longitudinal direction is the left-right direction of the vehicle, and a gas generated by the gas generator is introduced into the cylinder. A piston that is airtightly and slidably disposed and is operated by a gas introduced into the cylinder, a main body provided with the gas generator and the cylinder, a wire rope that connects the buckle and the piston in the cylinder, and a main body It has a pulley that is rotatably provided on the part and guides the wire rope.

  Further, in the seat belt device described in Patent Document 3, when the occupant gets on the vehicle and the seat belt is not attached, the buckle is set to the non-use position. In this non-use position, the buckle is held in a retracted position that does not obstruct the occupant who gets on the vehicle. Further, when an occupant who has boarded the vehicle is seated on the seat portion and grasps the tongue to attach the seat belt, the buckle is set to the use position by a driving device such as a motor. In the use position of the buckle, the occupant can easily engage the tongue with the buckle.

JP2013-163502A. JP-A-59-145543. Japanese Patent Laid-Open No. 2007-118776.

  By the way, in the seatbelt device provided with the pretensioner described in Patent Document 1, in order to improve both the ease of gripping the tongue when the seatbelt is mounted and the ease of getting on and off the passenger, the seatbelt device described in Patent Document 2 Can be applied. However, the seat belt device described in Patent Document 2 is not provided with a lap pretensioner. For this reason, in this seat belt device, the positions of the tongue and the portion of the seat belt that supports the tongue are simply changed to improve both the ease of tongue gripping and the ease of getting on and off the occupant. The influence on the function of the lap pretensioner by changing the position of the seat belt is not considered. That is, the lap pretensioner is required to have a function of effectively applying tension to the seat belt by quickly pulling the lap belt in an emergency. However, in the seat belt device described in Patent Document 2, this function is applied to the tongue and the seat. It is not taken into consideration that even if the position of the belt is changed, the belt is stably exhibited. Therefore, it is difficult to simply apply the seat belt device described in Patent Document 2 to the seat belt device described in Patent Document 1.

  Moreover, in the seatbelt apparatus provided with the pretensioner described in Patent Document 3, the buckle that is pulled by the buckle pretensioner in an emergency is provided on the opposite side of the vehicle seat from the side where the passenger gets on and off the vehicle. For this reason, even if the position of the buckle is changed, the ease of gripping the tongue and the ease of getting on and off the passenger are not affected. Therefore, the seat belt device described in Patent Document 3 does not consider the ease of tongue gripping and the ease of getting on and off the occupant, and the seat belt device described in Patent Document 3 is added to the seat belt device described in Patent Document 1. It is difficult to simply apply.

  The present invention has been made in view of such circumstances, and the purpose thereof is to improve the ease of gripping the tongue and the ease of getting on and off the occupant, and is necessary in an emergency by a pretensioner. It is to provide a seat belt device capable of quickly and effectively applying a proper tension to a seat belt (particularly a lap belt).

  In order to solve the aforementioned problems, a seat belt device of the present invention includes a seat belt that restrains an occupant, a seat belt retractor that winds up the seat belt, and a tongue that is slidably supported by the seat belt, Pulling the buckle on which the tongue is detachably locked and the front end of the seat belt pulled out from the seat belt retractor while maintaining the flat surface of the front end of the seat belt in an emergency, the seat It can be moved between a pretensioner that applies tension to the belt, and a belt retracted position where the front end of the seat belt is retracted from the vehicle passenger passage and a belt mounted position that makes it easier for the passenger to grip the tongue. A belt guide for guiding a front end portion of the seat belt, and the belt guide guided by the belt guide. It is characterized in that at least and a said seat belt belt flat surface direction control member for direction change control flat surface of the tip portion of which is connected to the re-tensioner.

  In the seat belt device according to the present invention, the pre-tensioner is a pre-tensioner that pulls a front end portion of the seat belt while maintaining a flat surface thereof.

  Further, in the seat belt device of the present invention, the belt flat surface direction control member is substantially from a substantially vertical direction surface in which the flat surface of the front end portion of the seat belt guided by the belt guide is directed substantially in the vehicle left-right direction. It is characterized in that the direction change control is performed so as to be a horizontal plane.

Further, in the seat belt device of the present invention, the belt flat surface direction control member is substantially from a substantially vertical direction surface in which the flat surface of the front end portion of the seat belt guided by the belt guide is directed substantially in the vehicle left-right direction. It is characterized in that direction change control is performed so as to be a substantially vertical direction surface facing the vehicle longitudinal direction.

  Further, in the seat belt apparatus of the present invention, the belt flat surface direction control member is formed in a flat plate shape, and the belt flat surface direction through which a front end portion of the seat belt guided by the belt guide penetrates slidably. It has a control hole, and the belt flat surface direction control hole controls the direction change of the flat surface of the front end portion of the seat belt guided by the belt guide.

  According to the seatbelt device of the present invention configured as described above, the belt guide retracts the front end of the seatbelt from the vehicle occupant getting-on / off passage and when the belt is attached to make it easier for the occupant to grip the tongue. It can be moved (rotated) between positions. Thereby, like the seat belt device described in Patent Document 2 described above, it is possible to further improve the ease of getting on and off the passenger and the ease of gripping the tongue.

  In addition, according to the seat belt device of the present invention, the direction change control of the flat surface of the front end portion of the seat belt connected to the pretensioner is performed by the belt flat surface direction control member. Therefore, when the front end of the seat belt is pulled by the pretensioner in an emergency, the flat surface of the front end of the seat belt is smoothly redirected by the belt flat surface direction control member, and the front end of the seat belt is more stable. And can be pulled. As a result, the necessary tension can be quickly and effectively applied to the seat belt (particularly, the lap belt) by the pretensioner in an emergency, and occupant restraint by the pretensioner can be effectively performed.

  Thus, according to the seatbelt device 1 of the present invention, the tension required in an emergency is quickly and effectively applied to the seatbelt by the pretensioner while further improving the ease of gripping the tongue and the ease of getting on and off the occupant. Will be able to.

  In addition, the flat surface of the front end of the seat belt can be smoothly controlled by the belt flat surface direction control member, so the pretensioner installation position can be set more freely and the pretensioner can be installed freely. The degree can be improved. Further, as a pretensioner, by using a compact and compact pretensioner having a relatively thin thickness such as the pretensioner described in the specification and drawings of Japanese Patent Application No. 2013-99463 filed by the present applicant earlier. Even if the belt flat surface direction control member is provided, the moving (turning) belt guide can be installed without interfering with the belt flat surface direction control member and the pretensioner. It becomes possible to form the whole structure of a tensioner compactly.

  Further, since the pretensioner directly pulls the front end portion of the seat belt, a connecting member for connecting the front end portion of the seat belt and the pretensioner, such as the wire described in Patent Document 1, is not required, and the number of parts can be reduced. In addition, the connecting work of the front end portion of the seat belt and the pretensioner and the connecting member becomes unnecessary, and the number of work steps can be reduced.

It is a figure showing typically the 1st example of an embodiment of a seatbelt device concerning the present invention. It is a figure which shows typically the belt guide which guides the pretensioner and the front-end | tip part of a seatbelt in the seatbelt apparatus of a 1st example seeing from the right side of a vehicle. It is sectional drawing which follows the III-III line in FIG. It is a perspective view explaining the action | operation of a belt guide. It is a figure similar to FIG. 2 which shows typically the 2nd example of embodiment of the seatbelt apparatus concerning this invention. It is sectional drawing similar to FIG. 3 which follows the VI-VI line in FIG. It is a perspective view explaining the action | operation of the belt guide of a 2nd example.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing a first example of an embodiment of a seat belt device according to the present invention.

As shown in FIG. 1, the seat belt device 1 of the first example is basically the same as a conventionally known three-point seat belt device. In the drawing, in the configuration of a conventionally known portion, 1 is a seat belt device, 2 is a vehicle seat, 3 is a seat belt retractor disposed in the vicinity of the vehicle seat 2, and 4 is formed by webbing and is attached to the seat belt retractor 3. A seat belt 5 that can be pulled out and restrains the occupant M in an emergency, 5 is a guide anchor that guides the seat belt 4 pulled out from the seat belt retractor 3 toward the shoulder of the occupant M, and 6 is a guide anchor 5 A tongue 7 slidably supported on the seat belt 4 that has been guided is a buckle that is fixed to the floor of the vehicle body or the vehicle seat and that the tongue 6 is detachably inserted and engaged. The seat belt 4 includes a shoulder belt 4a that restrains the shoulder and chest of the occupant M and a lap belt 4b that restrains the waist and the like of the occupant M.
The seatbelt 4 mounting operation and mounting release operation in the seatbelt apparatus 1 are the same as those of a conventionally known seatbelt apparatus.

  As shown in FIG. 1, the seat belt device 1 of the first example includes a front end portion 4 c of the seat belt 4 pulled out from the seat belt retractor 3 (that is, a front end side of the seat belt 4 from the lap belt 4 b of the seat belt 4. The portion following (2) is connected to the pretensioner 8. The pretensioner 8 is disposed on the boarding / alighting side of the occupant M in the vehicle opposite to the buckle 7 with respect to the vehicle seat 2 and is disposed and fixed on the vehicle longitudinal frame 9 of the body frame of the vehicle. The pretensioner 8 functions as a lap pretensioner in the same manner as a conventionally known lap pretensioner, and operates in the initial stage of the above-described emergency to pull and tension the lap belt 4b, so that the seat belt 4 (particularly, the lap belt 4b ) To increase the restraining force of the occupant M.

  FIG. 2 is a diagram schematically showing the pretensioner and the belt guide for guiding the front end of the seat belt in the seat belt device of the first example as viewed from the right side of the vehicle, and FIG. 3 is taken along the line III-III in FIG. FIG. 4 is a perspective view for explaining the operation of the belt guide.

As shown in FIG. 2, the pretensioner 8 of the seat belt device 1 of the first example is a pretensioner described in the specification and drawings of Japanese Patent Application No. 2013-99463 previously filed by the present applicant. . The pretensioner 8 is formed in a substantially cylindrical container shape having a substantially flat outer shape and a relatively thin thickness, and the piston generates a pressing force by the gas generated by the gas generator in an emergency, and this pressing force is substantially circular. By being transmitted to the front end portion 4c of the seat belt 4 via the arc-shaped force transmission member, the seat belt is not used without a flexible connecting member such as a wire used in the lap pretensioner described in Patent Document 1. The front end 4c itself of 4 is pulled directly. In that case, the pretensioner 8 retracts the front end portion 4c of the seat belt 4 in the rearward direction of the vehicle by winding it in an arc shape while maintaining the belt-like shape with the flat surface thereof being substantially horizontal. ing. Thus, the front end 4c of the seat belt 4
However, the pretensioner 8 can be formed in a compact and compact shape with a relatively thin thickness as the tension of the seat belt 4 increases. The detailed configuration and operation of this pretensioner can be generally understood by referring to the specifications and drawings of the above-mentioned patent application, so that detailed description thereof is omitted, but the specification of Japanese Patent Application No. 2013-99463 and It goes without saying that the seat belt device 1 of the first example of the present invention using the pretensioner described in the drawings can be easily implemented by those skilled in the art.

As shown in FIGS. 2 and 3, the belt guide 10 is supported by a fixed shaft 11 including a mounting screw fixed to the vehicle longitudinal frame 9 so as to be rotatable by a predetermined rotation angle. In this case, as shown in FIG. 4, the belt guide 10 rotates (that is, moves) in the vehicle front-rear direction with the flat surfaces 10a and 10b being substantially vertical surfaces. The belt guide 10 is formed in a rectangular tube shape having relatively thin and flat surfaces 10a and 10b. The belt guide 10 has a first opening 10c at one end thereof and a second opening 10d on a flat surface 10a on the side facing the vehicle longitudinal frame 9. Then, the front end 4c of the seat belt 4 is inserted into the first opening 10c from the first opening 10c or from the second opening 10d to the first opening 10c, so that the seat belt 4 can slide into the belt guide 10. It is penetrated. Therefore, a predetermined area portion of the front end portion 4 c of the seat belt 4 including a portion penetrating the belt guide 10 is guided by the belt guide 10 while being rotated along with the rotation of the belt guide 10. At this time, at least the flat surface of the portion that penetrates the belt guide 10 at the front end portion 4c of the seat belt 4 rotates in the vehicle front-rear direction so as to be a substantially vertical surface.

  The belt guide 10 is rotated by a driving device such as a motor (not shown). As shown in FIG. 4, the belt guide 10 is set in three positions: a normal position A, a belt retracting position B, and a belt mounting position C.

  The normal position A is a position that is set when the seat belt 4 is not worn and when the seat belt 4 is wound up to the maximum by the seat belt retractor 3. At the normal position A of the belt guide 10, the seat belt 4 guided from the guide anchor 5 is substantially linear toward the belt guide 10.

  Further, the belt retracting position B is a position where the seat belt 4 is not worn and the belt guide 10 is rotated to the rear of the vehicle at the maximum. As shown in FIG. 4, at the belt retraction position B of the belt guide 10 of the first example, the belt guide 10 overlaps the pretensioner 8 in the left-right direction of the vehicle, but the belt guide 10 and the pretensioner 8 are different from each other. They do not interfere with each other. In particular, since the pretensioner 8 is configured to be small and compact with a relatively thin thickness, the overall configuration of the belt guide 10 and the pretensioner 8 is formed compactly.

  Further, at the belt retraction position B of the belt guide 10, the seat belt 4 guided from the guide anchor 5 is positioned on the side of the seat back portion 2a of the vehicle seat 2 or slightly behind the seat back portion 2a. . Therefore, when the belt guide 10 and the seat belt 4 retreat from the passenger getting-on / off passage including the passenger entrance of the vehicle and the passenger gets on / off the vehicle, the belt guide 10 and the seat belt 4 interfere with getting on / off the passenger. In other words, the occupant can get on and off the vehicle more smoothly. Thereby, a passenger | crew's boarding / alighting ease is improved further.

Further, the belt-mounted position C is a position where the belt guide 10 is rotated forward in the vehicle. At the belt mounting position C of the belt guide 10, the tongue 6 supported by the seat belt 4 is positioned on the side of the front portion of the seat portion 2a in the vehicle seat 2 and above the seat portion 2a. Therefore, when the occupant grips the tongue 6 for mounting the seat belt 4, the occupant can easily grip the tongue 6. This further improves the ease of tongue gripping. Then, the drive device is controlled by a control device (ECU) (not shown), and is selectively set and held at any one of these three positions.

  The above-described three positions of the belt guide 10 are set by controlling the operation of the drive device by a control device (ECU) when a preset condition corresponding to each position is satisfied. That is, the setting condition of the normal position A of the belt guide 10 is, for example, detecting that no occupant is seated on the vehicle seat 2 with a seating switch or the like and detecting that the vehicle door is closed with a door switch or the like. Such as when. Further, the setting condition of the belt retraction position B of the belt guide 10 is, for example, detecting that no occupant is seated on the vehicle seat 2 with a seating switch or the like and detecting that the vehicle door is opened with a door switch or the like. And the presence of an occupant seated on the vehicle seat 2 is detected by a seating switch or the like and the fact that the tongue 6 is disengaged from the buckle 7 is detected by a buckle switch or the like. For example, when it is detected that has been opened. Furthermore, the setting of the belt mounting position C of the belt guide 10 detects that an occupant is seated on the vehicle seat 2 with a seating switch or the like and detects that the vehicle door is closed with a door switch or the like. Time. Of course, the setting conditions for the three positions of the belt guide 10 are not limited to these conditions, and other conditions necessary for setting each position can also be used.

  Further, a flat belt-shaped flat surface direction control member 12 is fixedly supported on a fixed shaft 11 fixed to the vehicle longitudinal frame 9. The belt flat surface direction control member 12 is formed with a belt flat surface direction control hole 12a. The belt flat surface direction control hole 12a is formed in an arc shape so as to protrude toward the guide anchor 5 (or the seat back portion 2a) and the pretensioner 8 side. The front end 4c of the seat belt 4 between the belt guide 10 and the belt flat surface direction control member 12 is slidably penetrated through the belt flat surface direction control hole 12a. The front end portion 4c of the seat belt 4 extending from the belt guide 10 is turned by the belt flat surface direction control hole 12a, and the flat surface is substantially horizontal from the substantially vertical direction facing the vehicle left-right direction. It is guided toward the pretensioner 8 while the direction change control is performed so that Further, the direction change of the front end portion 4c of the seat belt 4 is controlled so that the flat surface is finally drawn in a substantially horizontal plane by the pretensioner 8. When the belt guide 10 rotates between the normal position A, the belt retraction position B, and the belt attachment position C, the front end portion 4c of the seat belt 4 has an arcuate belt flat surface direction control hole 12a. The belt flat surface is moved along the belt.

  In the first example, as shown in FIG. 2, the front end portion 4c of the seat belt 4 is bent in a substantially V shape by the belt flat surface direction control member 12 when viewed from the vehicle left-right direction. In that case, the arc-shaped belt flat surface direction control hole 12a smoothly changes the direction by turning the flat surface of the front end portion 4c of the seat belt 4 from a substantially vertical surface facing the vehicle left-right direction to a substantially horizontal surface. It is set to control. Therefore, when the leading end 4c of the seat belt 4 is pulled by the pretensioner 8 in an emergency, the leading end 4c of the seat belt 4 is pulled more stably. As a result, necessary tension is quickly and effectively applied to the seat belt 4 (particularly, the lap belt 4b) by the pretensioner 8 in an emergency, and the occupant restraint by the pretensioner 8 is effectively performed.

According to the seat belt device 1 of the first example configured as described above, the belt guide 10 that guides the front end portion 4c of the seat belt 4 moves the seat belt 4 and the tongue 6 from the occupant entrance / exit passage including the occupant entrance / exit of the vehicle. It is provided so as to be rotatable between a retracted belt position B to be retracted and a belt-mounted position C that facilitates gripping of the tongue 6 by the occupant. Thereby, like the seat belt device described in Patent Document 2 described above, it is possible to further improve the ease of getting on and off the passenger and the ease of gripping the tongue. In particular, by providing the seat belt device 1 of this example to the two-door vehicle rear seat, it is possible to more effectively improve the occupant's ease of getting on and off the vehicle.

  In addition, according to the seat belt device 1 of the first example, the flat surface of the front end portion 4c of the seat belt 4 is formed by the arc-shaped belt flat surface direction control hole 12a of the belt flat surface direction control member 12. The direction is set so as to smoothly change the direction from the substantially vertical direction surface facing the vehicle left-right direction from the lap belt 4b side toward the pretensioner 8 side to the substantially horizontal direction surface. Therefore, when the leading end 4c of the seat belt 4 is pulled by the pretensioner 8 in an emergency, the leading end 4c of the seat belt 4 can be pulled more stably. Thereby, the necessary tension can be quickly and effectively applied to the seat belt 4 (particularly, the lap belt 4b) by the pretensioner 8 in an emergency, and the occupant restraint by the pretensioner 8 can be effectively performed.

  Thus, according to the seat belt device 1 of the first example, the tension required in an emergency is applied to the seat belt 4 (particularly, the lap belt) by the pretensioner 8 while further improving the ease of gripping the tongue and the ease of getting on and off the occupant. 4b) can be given quickly and effectively.

  Furthermore, the belt flat surface direction control member 12 can smoothly change the direction of the flat surface of the front end portion 4c of the seat belt 4, so that the installation position of the pretensioner 8 can be set more freely. It is possible to improve the degree of freedom of installation of the pretensioner 8. Furthermore, by using a small and compact pretensioner having a relatively thin thickness such as the pretensioner of the above-mentioned patent application as the pretensioner 8, the belt guide 10 that rotates even if the belt flat surface direction control member 12 is provided. The belt flat surface direction control member 12 and the pretensioner 8 can be installed without interfering with each other, and the overall configuration of the belt guide 10, the belt flat surface direction control member 12, and the pretensioner 8 can be compactly formed.

  Furthermore, since the front end portion 4c of the seat belt 4 is directly pulled by the pretensioner 8, a connecting member for connecting the front end portion 4c of the seat belt 4 and the pretensioner 8, such as a wire described in Patent Document 1, is not necessary. The number of parts can be reduced, and the connecting work between the front end 4c of the seat belt 4 and the pretensioner 8 and the connecting member becomes unnecessary, and the number of work steps can be reduced.

  FIG. 5 schematically shows a second example of the embodiment of the seat belt device according to the present invention. FIG. 5 is a view similar to FIG. 2, and FIG. 6 is a cross section similar to FIG. 7 and 7 are perspective views for explaining the operation of the belt guide of the second example. Note that the same components as those in the seat belt device of the first example are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the seat belt device 1 of the first example described above, the pretensioner 8 is attached to the vehicle front-rear direction frame 9 of the body frame, and the front end portion 4c of the seat belt 4 has a flat surface substantially horizontal in an emergency. However, in the seat belt device 1 of the second example as shown in FIGS. 5 and 6, the pretensioner 8 is attached to the vehicle left-right frame 13 of the body frame, Sometimes the front end portion 4c of the seat belt 4 is in a substantially vertical direction with its flat surface facing in the vehicle front-rear direction (in the example shown in FIGS. 5 and 6, in the vehicle left direction). ).

  Also in the seat belt device 1 of the second example, the belt guide 10 is rotatably supported by a fixed shaft 11 fixed to the vehicle longitudinal frame 9 as in the first example. In this case, as shown in FIG. 7, the belt guide 10 of the second example is also set with three positions, a normal position A, a belt retracting position B, and a belt mounting position C, as in the first example. Furthermore, the belt guide 10 has a first opening 10c at one end thereof, and a third opening on a flat surface 10b on the side facing the pretensioner 8 (the side opposite to the side facing the vehicle longitudinal direction frame 9). 10e. Therefore, the belt guide 10 of the second example does not have the second opening 10d of the belt guide 10 of the first example.

  Further, in the seat belt device 1 of the first example described above, the belt flat surface direction control member 12 is fixed to the fixed shaft 11 fixed to the vehicle longitudinal direction frame 9, but the seat belt device 1 of the second example. In this case, the belt flat surface direction control member 12 is positioned on the fixed shaft 11 in the belt guide 10 and is rotatably supported integrally with the belt guide 10. Similarly to the first example, a belt flat surface direction control hole 12a is formed in the belt flat surface direction control member 12 of the second example. In that case, unlike the first example, the belt flat surface direction control hole 12a of the second example is formed linearly. The linear belt flat surface direction control hole 12 a extends in a direction orthogonal or substantially orthogonal to the longitudinal direction of the belt guide 10. A front end portion 4c of the seat belt 4 that penetrates the belt guide 10 is slidably passed through the belt flat surface direction control hole 12a. Then, the belt flat surface direction control hole 12a causes the front end portion 4c of the seat belt 4 to change from the belt guide 10 while changing the flat surface from a substantially vertical surface facing the vehicle left-right direction to a substantially horizontal surface. It is extended and guided towards the pretensioner 8. Further, the front end portion 4c of the seat belt 4 is changed in direction so that the flat surface is finally drawn by the pretensioner 8 in a substantially vertical direction surface facing the vehicle longitudinal direction.

  Further, in the second example, as shown in FIG. 6, the front end portion 4 c of the seat belt 4 is bent substantially in an L shape when viewed from the vehicle front-rear direction by the belt flat surface direction control member 12. Since the front end portion 4c of the seat belt 4 is bent substantially in an L shape in this way, the bending angle is smaller than in the case of being bent in a V shape as in the first example. The seat belt 4 is rotated when the belt guide 10 is rotated while smoothly changing the direction of the flat surface of the front end portion 4c of the belt 4 from the substantially vertical direction surface facing the vehicle left-right direction to the substantially vertical direction surface facing the vehicle front-rear direction. Is set so as to smoothly rotate the portion that penetrates the belt flat surface direction control hole 12a in the front end portion 4c.

  Other configurations and other operations of the seat belt device 1 of the second example are the same as those of the seat belt device 1 of the first example. The operation and effect of the seat belt device 1 of the second example is substantially the same as that of the seat belt device 1 of the first example.

  The seat belt device of the present invention is not limited to each example of the above-described embodiment of the present invention. For example, in each of the above-described examples, the belt guide 10 is rotated by a driving device such as a motor. However, the belt guide 10 is not necessarily limited to this, and the belt guide 10 is manually operated in the three positions described above. It can also be made to rotate between. In this case, the driving device is not necessary, and it is not necessary to set conditions corresponding to the normal position A, the belt retracting position B, and the belt mounting position C. Of the three positions described above, the normal position A is not necessarily required and can be omitted, or the same position as any of the belt retracting position B and the belt mounting position C can be set. You can also. In short, the present invention can be modified in various ways within the scope of the matters described in the claims.

  INDUSTRIAL APPLICABILITY The seat belt device of the present invention is suitably used for a seat belt device including a pretensioner that pulls a seat belt (particularly, a lap belt) to increase the restraining force of an occupant by the seat belt in an initial stage of an emergency such as a vehicle collision can do.

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 2 ... Vehicle seat, 2a ... Seat back part, 2b ... Seat part, 3 ... Seat belt retractor, 4 ... Seat belt, 4a ... Shoulder belt, 4b ... Wrap belt, 4c ... Tip part, 5 ... Guide anchor, 6 ... tongue, 7 ... buckle, 8 ... pretensioner, 9 ... vehicle longitudinal frame, 10 ... belt guide, 10a, 10b ... flat surface of belt guide 10, 10c ... first opening, 10d ... 2nd opening part, 11 ... Fixed shaft, 12 ... Belt flat surface direction control member, 12a ... Belt flat surface direction control hole, 13 ... Vehicle left-right direction frame, M ... Passenger

Claims (5)

A seat belt to restrain the occupant;
A seat belt retractor that winds up the seat belt;
A tongue slidably supported on the seat belt;
A buckle on which the tongue is releasably locked;
A pretensioner for applying tension to the seat belt by directly pulling a front end portion of the seat belt pulled out from the seat belt retractor while maintaining a flat surface of the front end portion of the seat belt in an emergency;
The front end of the seat belt is movably provided between a belt retracted position where the front end of the seat belt is retracted from a passenger getting-on / off passage of the vehicle and a belt mounted position that facilitates gripping of the tongue by the passenger. Belt guide to guide the part,
A belt flat surface direction control member that controls the direction change of the flat surface of the front end portion of the seat belt guided by the belt guide and connected to the pretensioner;
A seatbelt device comprising:   The seat belt device according to claim 1, wherein the pretensioner is a pretensioner that pulls a front end portion of the seat belt while maintaining a flat surface thereof.   The belt flat surface direction control member controls the direction change so that the flat surface of the front end portion of the seat belt guided by the belt guide is changed from a substantially vertical direction surface facing substantially the vehicle left-right direction to a substantially horizontal direction surface. The seat belt device according to claim 1, wherein the seat belt device is provided.   The belt flat surface direction control member includes a substantially vertical direction surface extending from a substantially vertical direction surface facing the vehicle left-right direction to a substantially vertical direction surface facing the vehicle front-rear direction from a flat surface of the front end portion of the seat belt guided by the belt guide. 3. The seat belt device according to claim 1, wherein the direction change control is performed so that The belt flat surface direction control member is formed in a flat plate shape, and has a belt flat surface direction control hole through which a front end portion of the seat belt guided by the belt guide slidably passes.
The seat according to any one of claims 1 to 4, wherein the belt flat surface direction control hole controls the direction change of the flat surface of the front end portion of the seat belt guided by the belt guide. Belt device.

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