JP2010083460A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device enhancing the belt fit-feeling. <P>SOLUTION: (1) The seat belt device includes a pair of right and left elastic belt bodies 30 connected to a belt body turning shaft turnably arranged on an upper end of a seatback to be flip-up when a belt is not fitted and having a webbing insertion hole in fore ends thereof, a webbing 10 passing through webbing guides provided on right and left sides of an intermediate part in the height direction of the seatback, and extending between the right and left webbing guides, a first retractor 50 having a pretensioner connected to an end of the webbing, a lap belt 20 separated from the webbing, and having a tongue 70 to be inserted in/detached from a buckle being fitted to one end, and a second retractor 60 connected to the other end of the lap belt. (2) The seat belt device 1 has a torque transmission means 80 for transmitting the turning torque of the second retractor 60 associated with the attachable/detachable operation of the lap belt as the turning torque of a belt body turning shaft 81. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a seat belt device for a vehicle that can improve a feeling of wearing a seat belt.

  Most vehicles employ a three-point seat belt system. However, the three-point seat belt device has room for improvement in terms of further improving the restraining performance of the upper body at the time of a frontal collision, a far-side collision, or a rollover.

In order to improve restraint of the upper body at the time of frontal collision, far-side collision, and rollover, Patent Document 1 discloses that an X-shaped seat belt composed of a webbing and an elastic covering is placed on the upper end of the seat back at the left and right upper ends. A four-point seat belt device is disclosed that is connected so as to be able to be lifted up, and is connected to the left and right side portions of the seat cushion so as to be detachable with tongues and buckles.
JP 2000-016238 A

However, the vehicle seat belt device of Patent Document 1 has the following problems to be solved.
(I) There is room for improvement in the feeling of wearing the seat belt.
When the seat belt is worn, the intersection of the X-shaped seat belt is always in contact with the front of the chest, so there is room for improvement in the feeling of wearing the seat belt.
(Ii) There is room for improvement in detachability of the belt.
Since the connecting portion between the tongue plate and the buckle is provided at the two left and right lower end portions of the X-shaped seat belt, there is room for improvement in the detachability of the belt.

The objective of this invention is providing the seatbelt apparatus which can improve a seatbelt wearing feeling.
Another object of the present invention is to provide a seat belt device that can improve the feeling of wearing the seat belt and improve the detachability of the seat belt.

  The vehicle seat belt device of the present invention that solves the above-described problems or achieves the above-described object is as follows.

(1) A belt body rotating shaft is arranged so that one end of the belt extends from above the shoulder of the occupant toward the front of the chest when the belt is worn and is flipped up when the belt is not worn. A pair of elastic left and right strips connected and provided with a webbing insertion hole at one end;
A webbing guide provided on the left and right side portions of the seatback height direction intermediate portion is inserted and extends between the left and right webbing guides. When the pretensioner is not operated, the seatback extends from the webbing guide to the left and right side portions of the seatback upper end. A webbing that extends from the left and right sides of the upper end to the webbing insertion hole at one end of the band, and that extends from the webbing guide to the webbing insertion hole at one end of the band when the pretensioner is activated;
A first retractor with a pretensioner connected to an end portion of the webbing, a lap belt separately attached to the webbing and attached with a tongue inserted into and removed from the buckle at one end;
A second retractor coupled to the other end of the lap belt;
A seat belt device comprising:
(2) The seatbelt device according to (1), further comprising torque transmission means for transmitting the rotation torque of the second retractor accompanying the attachment / detachment operation of the lap belt as the rotation torque of the belt body rotation shaft. .
(3) The seat belt according to (1) or (2), further comprising: a second belt body that is connected to one side portion of the seat cushion on the connection side to the second retractor of the lap belt and passes through the lap belt. apparatus.
(4) The seat belt device according to any one of (1) to (3), wherein an airbag that is deployed on the occupant head side is accommodated in the pair of left and right belts.
The above (1) to (4) are applicable to all the embodiments of the present invention.

(5) The seat belt device according to any one of (1) to (4), wherein the belt supports the webbing so that the webbing is separated from the belt when the pretensioner is operated.
The above (5) is applicable to the first embodiment of the present invention.
(6) A webbing hanger provided on the left and right sides of the upper end of the seat back is provided, and the webbing hanger supports the webbing so that the webbing is detached from the webbing hanger when the pretensioner is operated. ) The seat belt device according to any one of the above.
The above (6) is applicable to Embodiment 2 of the present invention.
(7) detection means for detecting whether the buckle and the tongue plate are attached or not;
Driving means for rotating the belt,
Control means for controlling the drive means based on the detection result of the detection means;
The seat belt device according to (1), further comprising:
The above (7) is applicable to Embodiment 3 of the present invention.

  According to the seat belt device of the above (1), when the seat belt is worn, the occupant's chest is only restrained by a pair of left and right belts that are separated from each other (the webbing between one end of the pair of left and right belts is not on the chest The degree to which the seat belt is lightly touched), the front part of the chest is not always restrained and pressed at the intersection of the X-shaped belts as in the conventional X-shaped seat belt device, and the feeling of wearing the seat belt is improved. In addition, since the pair of left and right belts are separated from each other without intersecting, concentration of the load from the belt to the occupant chest is suppressed when the pretensioner is activated.

  According to the seat belt device of the above (2), since the torque transmission means is provided, the rotation of the second retractor accompanying the attaching / detaching operation of the lap belt can be interlocked with the vertical rotation of the belt. By simply attaching / detaching the lap belt, it is possible to operate the attachment / non-attachment of the left and right belts, and the detachability of the seat belt is improved.

  According to the seat belt device of the above (3), since the second belt body is provided, the detachable operability of the lap belt can be improved.

  According to the seat belt device of (4) above, since the airbag deployed on the passenger head side is stored in the pair of left and right belts, the air stored in the pair of left and right belts at the time of a vehicle collision The bag can be deployed to further protect the occupant.

  According to the seat belt device of the above (5), since the webbing is integrally supported by the belt, usability and appearance are improved.

  According to the seat belt device of the above (6), since the webbing is supported by the webbing hanger, it is easy to separate the webbing from the belt during the pretensioner operation.

  According to the seat belt device of (7) above, it is possible to automatically detect whether the buckle and the tongue plate are attached or not, and raise and lower the belt.

Below, the seatbelt apparatus of this invention is demonstrated with reference to drawings.
1 to 13 show a first embodiment of the present invention (FIGS. 11 to 13 apply to other embodiments of the present invention), FIGS. 14 to 20 show a second embodiment of the present invention, FIG. 21 shows Embodiment 3 of the present invention.
Components common to the first to third embodiments of the present invention are denoted by the same reference numerals throughout the first to third embodiments of the present invention.

[Example 1]
First, a vehicle seat belt device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 2 show the seat belt mounted state and the pretensioner non-operating state, FIGS. 3 to 4 show the seat belt non-operating state, and FIGS. 5 to 6 show the seat belt mounted state and the pretensioner operating state. Indicates.

[Overall configuration of seat belt device]
The seat belt device 10 of the present invention is a four-point vehicle seat belt device. The seat belt device 1 of the present invention includes a pair of left and right belt bodies (shoulder belt bodies) 30, a webbing 10 that functions as a shoulder belt, a first retractor 50 with a pretensioner connected to the webbing 10, and the webbing 10. Includes a separate lap belt 20 and a second retractor 60 connected to the lap belt 20. A tongue plate 70 is provided at one end of the lap belt 20, and the tongue plate 70 is inserted into and removed from the buckle 71. The seat 90 includes a seat back 91, a seat cushion 92, and a headrest 93.

  The pair of left and right belt bodies 30 have elasticity and are made of, for example, resin. The pair of left and right belt bodies 30 are arranged so that one end of the belt body 30 extends from the shoulder of the occupant J toward the front of the chest (left and right sides of the upper front of the chest) when the belt is worn, and is flipped up when the belt is not worn. The other end of the band 30 is connected to a band rotating shaft that is rotatably disposed on the seat back upper end portion 96. A webbing insertion hole 31 through which the webbing 10 is inserted is provided at one end of the band 30. The webbing insertion hole 31 may be replaced with a slip ring fixed to one end of the band 30. Moreover, the front-end | tip of a pair of right and left belt | band | zone 30 may be mutually connected by the connection belt | band | zone extended in the left-right, In that case, it will become one belt | band | zone 30. The illustrated example shows a case where the left and right belt bodies 30 are not connected to each other by a connection belt body.

  The end of the webbing 10 is connected to the first retractor 50 provided in the seat back 91, and the webbing 10 is inserted through the webbing guide 94 provided on the left and right side portions of the intermediate portion in the height direction of the seat back 91. It exits from the seat back 91 and extends between the left and right webbing guides 94. The webbing 10 extends from the webbing guide 94 to the left and right side portions of the seat back upper end 96 when the pretensioner is not operated (when the belt is not mounted and when the belt is mounted). The webbing insertion hole 31 at one end of the belt body extends from the side portion. When the pretensioner is operated, the webbing 10 is detached from the left and right side portions of the seat back upper end 96 and extends directly from the webbing guide 94 to the webbing insertion hole 31 at one end of the band 30.

  When the pretensioner is operated, the webbing 10 is separably fixed or supported (or slidably supported) on the left and right belt bodies 30 or on the webbing hanger 35 extending outward from the left and right belt bodies 30 in the left-right direction. ) When the pretensioner is activated, the webbing 10 is separated from the left and right belt bodies 30 or the webbing hanger 35 and extends directly from the webbing guide 94 to the webbing insertion hole 31 at one end of the belt body 30. When the pretensioner is operated, a portion of the webbing 10 extending between the webbing insertion holes 31 at one end of the left and right belt bodies 30 functions as an upper chest restraint belt. Further, a portion from the webbing insertion hole 31 to the webbing guide 94 at one end of the left and right belt bodies 30 of the webbing 10 serves as a chest-abdominal side restraint belt when the pretensioner is operated.

  The first retractor 50 has a pretensioner and is connected to the left and right ends of the webbing 10. Two first retractors 50 may be provided, one for each of the left and right ends of the webbing 10, or only one in common for the left and right ends of the webbing 10. Also good. The illustrated example shows a case where one first retractor 50 is provided at each of the left and right end portions of the webbing 10. A conventionally well-known thing can be used for a retractor and a pretensioner.

  The lap belt 20 is a waist restraining belt, is a belt different from the webbing 10 that functions as a shoulder belt, and is not connected to the webbing 10. A second retractor 60 is connected to the lap belt 20. The second retractor 60 may be provided with a pretensioner or may not be provided with a pretensioner. The second retractor 60 is provided in the seat cushion 92. A tongue plate 70 is provided at one end of the lap belt 20 (the end opposite to the end connected to the second retractor 60), and the tongue plate 70 is inserted into and removed from the buckle 71. When the lap belt 20 is pulled out from the second retractor 60 and the tongue plate 70 is inserted into the buckle 71, the belt is attached. The tongue plate 70 is removed from the buckle 71 and the lap belt 20 is rewound onto the second retractor 60. Is when the belt is not attached.

  A second belt 40 is connected to one side of the seat cushion on the connection side of the lap belt 20 to the second retractor 60. The lap belt 20 is slidably inserted through the second belt 40. The lap belt 20 is inserted through the second belt 40, is inserted into the seat cushion 92 through the webbing guide 95 provided on the side surface of the seat cushion 92, and is attached to the second retractor 60 provided in the seat cushion 92. Connected. The buckle 71 is provided on the vehicle outer side of the seat cushion 92, and the second belt body 40 is provided on the vehicle inner side of the seat cushion 92. This is to prevent the second belt 40 from getting in the way when the passenger J gets in and out.

As shown in FIGS. 10 to 13, the seat belt apparatus 1 transmits torque for rotating the second retractor 60 accompanying the attaching / detaching operation of the lap belt 20 as torque for rotating the belt rotating shaft. Means (torque transmission device) 80 is provided. The torque transmission means 80 is provided between the rotation shaft 81 of the band 30, the gear 82 added to the second retractor 60, the wire side gear 83, and the gear 82 and the wire side gear 83. The intermediate gear 85 having teeth only on a part thereof, the wire side gear 83 and the belt rotating shaft 81, and the torque of the wire side gear 83 while freely changing the direction of the axis of rotation of the wire side gear 83 The wire (which may be a bundle of wires) 84 is transmitted to the belt rotating shaft 81 of the belt 30. Since the second retractor 60 winds up the lap belt 20 and also lifts the belt 30, the belt retracting force is increased as compared with the case where the second retractor 60 only winds up the lap belt 20. ing. Further, since the intermediate gear 85 has teeth only on a part of the circumference, both the gear 82 and the wire side gear 83 are engaged with the intermediate gear 85, and only one of the gear 82 and the wire side gear 83 is the intermediate gear 85. And a state of meshing with each other. In the belt non-attached state (state where the band 30 is raised), both the gear 82 and the wire side gear 83 are engaged with the intermediate gear 85 (FIG. 11), and the belt is attached (state where the band 30 is lowered). Then, only one of the gear 82 and the wire side gear 83 meshes with the intermediate gear 85 (FIG. 13), and the belt 30 comes into contact with the shoulder of the occupant J under its own weight. The reason for contacting the shoulder of the occupant J with its own weight is to contact the occupant's shoulder with a constant force regardless of the occupant's physical difference (shoulder height difference). FIG. 12 shows a state in which the belt 30 is in the middle of rising from the lowered state (a state in the middle of changing from the belt wearing state to the non-wearing state).
The configuration of the gear is not limited to the embodiment of the present invention, and may be configured by two pieces of a retractor gear and a wire side gear. In the case of the two-gear structure, one of the retractor gear and the wire side gear is composed of a gear having teeth only on a part of the circumference.

  The pair of left and right belt bodies 10 may store an airbag 100 that is deployed on the occupant head side in the event of a vehicle collision. When the airbag 100 is housed in the pair of left and right belts 10, the inflator 101 is disposed in the seat back 91, and the inflator 101 and the airbag 100 are connected by an air bag inflation gas distribution tube 102.

Next, the state where the seat belt is not attached and attached, and the state at the time of a vehicle collision will be described.
(A) Seatbelt non-attached state The tongue plate 71 is removed from the buckle 70, the lap belt 20 is automatically retracted (retracted) by the second retractor 60, and the second belt 40 is a vehicle with a seat cushion 92. Stands up elastically on the inner side. The lap belt 20 is wound by the second retractor 60 until the tongue plate 70 reaches the upper end position of the band 40 of the second band 40.

  The rotational torque of the second retractor 60 involving the lap belt is determined by the rotation of the gear 82 added to the second retractor 60 of FIGS. 10 to 13 through the intermediate gear 85, the wire side gear 83 and the wire 84. It is transmitted to the band rotating shaft 81 of the band 30. The left and right belt bodies 30 are turned around the belt body rotation shaft 81 in the direction in which the tip end side is lifted. Therefore, as the lifting torque of the belt rotating shaft 81, the wrap belt winding torque of the second retractor 60 is used, and the lap belt 20 is driven by the torque of the second retractor 60 only by removing the tongue plate 71 from the buckle 70. The left and right belt bodies 30 and the webbing 10 are flipped up. This state is a state where the seat belt is not attached. The completed state of seat belt non-wearing is shown in FIGS.

  In this state, the webbing 10 is lifted immediately below the roof of the vehicle, and the webbing portion from the webbing insertion hole 31 at the tip of the left and right belt bodies 30 to the webbing guide 94 extends along the left and right side surfaces of the seat back 91. Because it is extended, it does not get in the way of passenger J getting on and off. Further, when the occupant gets on, the webbing 10 is not sandwiched between the occupant and the seat back 91.

(B) Seat belt wearing state The occupant J is seated on the seat 90, pulls the tongue plate 70 at the upper end of the second belt body 40 by hand, pulls out the lap belt 20 from the second retractor 60, and the lap belt 20 Is placed on the waist, and the tongue plate 70 is inserted into the buckle 71.

  When the lap belt 20 is pulled out from the second retractor 60, the rotation of the wire side gear 83 that is linked via the intermediate gear 85 to the rotation of the gear 82 of the second retractor 60 is rotated via the wire 84. This is transmitted to the moving shaft 81. As a result, the left and right belt bodies 30 pivot around the belt body pivot shaft 81 and descend. When the belt 82 is lowered to a certain extent, the gear 82 and the wire side gear 83 are disengaged, and the left and right belt bodies 30 are rotated by their own weights about the belt body rotation shaft 81 and fall on the shoulder of the occupant J. In this state, the webbing 10 extends from the webbing guide 94 to the left and right sides of the upper end 96 of the seat back 91, extends from there to the webbing insertion hole 31 at the tip of the band 30, and passes through the webbing insertion hole 31 to the left and right. The webbing insertion hole 31 extends in the right and left direction. This state is a state where the seat belt is completely attached. The completed state of seat belt installation is shown in FIGS.

(C) At the time of collision The sensor detects the collision of the vehicle, and the pretensioner of the first retractor 50 is actuated by the electric signal to retract the webbing 10. When the operating force of the pretensioner of the first retractor 50 is applied to the webbing 10, the webbing 10 comes off from the left and right sides of the seat back upper end 96, and the webbing insertion hole 31 at one end of the left and right belt bodies 30 from the webbing guide 94. Extend directly to. This state is the state shown in FIGS.

  In the state of FIGS. 5 to 6, the webbing portion extending between the webbing insertion holes 31 at the tips of the left and right belt bodies 30 functions as a front chest restraint webbing. Since the left and right belt bodies 30 are separated from each other with a space left and right, the load is distributed to the left and right, and the load is prevented from being concentrated on the center of the chest of the occupant J like a conventional X-shaped belt. A portion between the webbing insertion hole 31 at the tip of the left and right belt bodies 30 and the left and right belt guides 94 serves as a thoracoabdominal side restraint belt. The occupant J is also restrained in the left-right direction by the chest-abdominal side restraint belt, and is restrained safely against far-side collision and rollover. The lap belt 29 restrains the waist. Since the lap belt 29 is not pulled upward by the webbing 10, the waist is sufficiently restrained and the submarine phenomenon can be suppressed.

  Further, when the airbag 100 is incorporated in the belt body 30, the head of the occupant J can be safely restrained by inflating and deploying the airbag 110 on the occupant head side in the event of a vehicle collision.

The above configuration is also applied to other embodiments other than the first embodiment. The first embodiment of the present invention further includes the following unique configuration.
As shown in FIGS. 7 to 9, the left and right belt bodies 30 support the webbing 10 so that the webbing 10 is separated from the belt body 30 when the pretensioner of the first retractor 50 is operated. Yes. 7 to 9, the webbing 10 is applied to the left and right belt bodies 30, for example, the surfaces of the left and right belt bodies 30 (the surface on the side in contact with the occupant J or the opposite side thereof). The surface may be fixed integrally with a thread that is broken by the operating force of the pretensioner or an adhesive.

  Therefore, when the seat belt is attached and the pretensioner is not in operation, as shown in FIGS. 1 and 2, the webbing 10 extends upward from the webbing guide 94 to the left and right ends of the seat back upper end 96, and from there Bends inward in the direction, bends forward at the upper ends of the left and right belt bodies 30, curves further downward, extends to the webbing insertion holes 31 at the tips of the left and right belt bodies 30, passes through the webbing insertion holes 31, and It extends in the left-right direction between the webbing insertion holes 31 at the tip of the body 30.

  3 and 4, when the seat belt is not attached, the webbing 10 extends upward from the webbing guide 94 to the left and right ends of the seat back upper end 96, and then bends inward in the left-right direction of the seat. At the upper end of the belt 30, it extends upward along the belt 30, further bends obliquely upward, extends to the webbing insertion hole 31 at the tip of the left and right belts 30, passes through the webbing insertion hole 31, It extends in the left-right direction between the webbing insertion holes 31 at the tip of the band 30.

  In the pretensioner operating state, as shown in FIGS. 5 and 6, the webbing 10 is separated from the belt body 30 and extends obliquely forward from the webbing guide 94 to the webbing insertion holes 31 at the tips of the left and right belt bodies 30. The webbing insertion holes 31 are inserted and extend in the left-right direction between the webbing insertion holes 31 at the tips of the left and right belt bodies 30.

  7 to 9, instead of the structure in which the webbing 10 is fixed to the band 30 with a thread or an adhesive, a hole through which the webbing 10 is slidably inserted is provided in the band 30. A part of the webbing 10 may be separated from the remaining part of the wall by the pretensioner operating force, and the webbing 10 may be supported by the band 30. In that case, when the actuating force of the pretensioner is applied, a part of the wall is detached and the webbing 10 is detached from the band 30.

Next, operations and effects of the first embodiment of the present invention will be described.
First, when the seat belt is worn, the occupant J's chest is only restrained by a pair of left and right strips 30 that are separated from each other, and the webbing between the ends of the pair of left and right strips is only in light contact with the chest. (In addition, when the distal ends of the pair of left and right belt bodies 30 are connected by a connection belt body, the pair of left and right belt bodies 30 are separated from the center of the chest to the left and right). In this way, the front part of the chest is not always restrained or compressed at the intersection of the X-shaped belts, and the feeling of wearing the seat belt is improved. Further, since the pair of left and right belt bodies 30 are separated from each other without intersecting, concentration of load from the belt body 30 to the chest of the occupant J is suppressed when the pretensioner is operated (at the time of a vehicle collision).

  Further, since the seat belt device 1 includes the torque reaching means 80, the rotation of the second retractor 60 accompanying the operation of attaching / detaching the lap belt 20 can be interlocked with the vertical rotation of the left and right belt bodies 30. The mounting and non-mounting of the left and right belt bodies 30 can be operated only by the operation of mounting and non-mounting the lap belt 20, and the detachability operability of the seat belt is improved. There is no need to raise and lower the webbing 10 and the left and right belt bodies 30 by hand, and the webbing 10 and the left and right belt bodies 30 are automatically moved up and down in conjunction with the attachment / detachment operation of the lap belt 20 when the lap belt 20 is attached / detached. It is rotated.

  In addition, since the second belt body 40 is provided, the lap belt 20 is not entangled with the occupant J, and the detachable operability of the lap belt 20 can be improved.

Further, when the airbag 100 deployed on the passenger head side is accommodated in the pair of left and right belt bodies 30, the airbag 100 housed in the pair of left and right belt bodies is deployed at the time of a vehicle collision, The passenger can be further protected.
The above operations and effects are also applied to embodiments other than the first embodiment of the present invention.

In the first embodiment of the present invention, the following specific actions and effects can be obtained.
In the first embodiment, since the webbing 10 is integrally supported by the band 30, the usability and appearance of the webbing 10 and the band 30 are improved as compared with the case where the webbing 10 is partially separated from the band 30. At the time of a vehicle collision, the pretensioner operating force is applied to the webbing 10, and the webbing 10 is detached from the band 30 at the hatched portion of FIGS. 7 to 9, and the state shown in FIGS. Time and effect can be obtained.

[Example 2]
In the description of the first embodiment, the part that can be applied to other than the first embodiment also applies to the second embodiment of the present invention. Hereinafter, a specific configuration of the second embodiment of the present invention will be described with reference to FIGS.

  In the second embodiment of the present invention, the seat belt device 1 includes the webbing hanger 35 provided on the left and right sides of the seat back upper end 96. The webbing hanger 35 supports the webbing 10 so that the webbing 10 is detached from the webbing hanger 35 when the pretensioner of the first retractor 50 is operated. The webbing support portion of the webbing hanger 35 is provided with a slit hole 36 through which the webbing 10 passes. The wall portion 37 of the slit hole 36 that is pressed from the webbing 10 when a pretensioner operating force is applied to the webbing 10 is formed by a breaking portion 38 (thickness of the wall portion 37 that has a wall thickness when the pretensioner operating force is applied. The webbing 10 comes out of the slit hole 36 and the webbing 10 comes off from the webbing hanger 35.

  When the seat belt is attached and the pretensioner is not in operation, as shown in FIGS. 14 and 15, the webbing 10 extends upward from the webbing guide 94 to the slit holes 36 of the webbing hanger 35 at the left and right ends of the seatback upper end 96. From there, it bends forward and bends downward outside the left and right belt bodies 30, extends to the webbing insertion holes 31 at the tips of the left and right belt bodies 30, passes through the webbing insertion holes 31, and is inserted into the left and right belt bodies. It extends in the left-right direction between the webbing insertion holes 31 at the tip of 30.

  When the seat belt is not attached, as shown in FIGS. 16 and 17, the webbing 10 extends upward from the webbing guide 94 to the slit hole 36 of the webbing hanger 35 at the left and right ends of the seatback upper end 96, and from there Outside of the belt body 30, extending upward and curving obliquely upward, extending to the webbing insertion holes 31 at the distal ends of the left and right belt bodies 30, passing through the webbing insertion holes 31, and It extends in the left-right direction between the webbing insertion holes 31.

  In the pretensioner operating state, as shown in FIGS. 18 and 19, the webbing 10 is detached from the slit hole 36 of the webbing hanger 35 at the left and right ends of the seat back upper end 96 and obliquely forward from the webbing guide 94. It extends to the webbing insertion hole 31 at the tip of the belt 30, passes through the webbing hole 31, and extends in the left-right direction between the webbing holes 31 at the tip of the left and right belts 30.

In the second embodiment of the present invention, the following specific actions and effects can be obtained.
Since the webbing hanger 35 supports the webbing 10, the webbing 10 can be easily separated from the webbing hanger 35 and the left and right belt bodies 30 when the pretensioner is operated. However, the webbing insertion hole 31 at the tip of the band 30 is excluded. The webbing 10 is not separated from the webbing insertion hole 31 of the band 30.

Example 3
In the description of the first embodiment, the part that can be applied to other than the first embodiment also applies to the third embodiment of the present invention. Hereinafter, a specific configuration of the third embodiment of the present invention will be described with reference to FIG.

  In the third embodiment of the present invention, the seat belt apparatus 1 includes a detection unit 86 that detects whether the buckle 71 and the tongue plate 70 are mounted or not, and a driving unit that rotates the band 30 (for example, a band rotating shaft). 81) and a control means 88 for controlling the drive means 87 based on the detection result of the detection means 86. When the detecting means 86 detects that the tongue plate 70 is attached to the buckle 71, the control means 88 rotates the band rotating shaft 81 so that the band 30 is lowered, and the tongue plate 70 is detached from the buckle 71. When it is detected that the belt body 30 is raised, the belt body rotation shaft 81 is rotated so that the belt body 30 is raised.

  According to the seatbelt device of the third embodiment of the present invention, it is possible to automatically detect whether the buckle 71 and the tongue plate 70 are attached or not, and to raise and lower the belt body 30, thereby improving operability.

It is a front view of the seatbelt wearing state of the seatbelt apparatus of Example 1 of this invention. It is a side view of the seatbelt wearing state of the seatbelt apparatus of Example 1 of this invention. It is a front view of the seatbelt apparatus of Example 1 of this invention of the seatbelt non-wearing state. It is a side view of the seatbelt apparatus of Example 1 of this invention of the seatbelt non-mounting | wearing state. It is a front view of the seatbelt apparatus of Example 1 of this invention in the seatbelt wearing state and the pretensioner operating state. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a seat belt device according to a first embodiment of the present invention in a seat belt wearing state and a pretensioner operating state. It is a front view of a part of left and right belt bodies and webbing in the seat belt wearing state of the seat belt device of Example 1 of the present invention. It is a side view of a part of left and right belt bodies and a webbing in the seat belt wearing state of the seat belt device of Example 1 of the present invention. It is a top view of a part of left and right belt bodies and webbing in the seat belt wearing state of the seat belt device of Example 1 of the present invention. It is a block diagram of the torque transmission means of the seatbelt apparatus of Example 1, 2 of this invention. It is a front view of the state which the belt body went up of the torque transmission means of the seatbelt apparatus of Examples 1 and 2 of the present invention (belt non-wearing state). It is a front view of the state which is in the middle (the state in the middle from the belt wearing state to the non-wearing state) of the belt body of the torque transmission means of the seat belt device of Examples 1 and 2 of the present invention. It is a front view of the state (belt wearing state) of the belt body of the torque transmission means of the seat belt device according to the first and second embodiments of the present invention. It is a front view of the seatbelt wearing state of the seatbelt apparatus of Example 2 of this invention. It is a side view of the seatbelt wearing state of the seatbelt apparatus of Example 2 of this invention. It is a front view of the seatbelt non-wearing state of the seatbelt apparatus of Example 2 of this invention. It is a side view of the seatbelt apparatus of Example 2 of this invention of the seatbelt non-wearing state. It is a front view of the seatbelt apparatus of Example 2 of this invention in the seatbelt wearing state and the pretensioner operating state. It is a side view of the seatbelt apparatus of Example 2 of this invention in the seatbelt wearing state and the pretensioner operating state. It is a front view of a part of webbing hanger and webbing in the seatbelt wearing state of the seatbelt device of Example 2 of the present invention. It is the block diagram which took out and showed only the apparatus part which concerns on the drive of raising / lowering a belt body of the seatbelt apparatus of Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seatbelt apparatus 10 Webbing 20 Lap belt 30 Band 31 Webbing insertion hole 35 Webbing hanger 36 Slit hole 37 Wall part 38 Breaking part 40 Second band 50 First retractor (with pretensioner)
60 second retractor 70 tongue plate 71 buckle 72 webbing or wire 80 torque transmission means 81 belt rotation shaft 82 gear 83 wire side gear 84 wire 85 intermediate gear 86 detection means 87 drive means 88 control means 90 seat 91 seat back 92 Seat cushion 93 Headrest 94 Webbing guide 95 Belt guide 96 Seat back upper end 100 Air bag 101 Inflator 102 Air inflation gas distribution tube

Claims (7)

The other end is connected to a belt rotation shaft that is rotatably arranged at the upper end of the seat back so that one end extends from the shoulder of the occupant toward the front of the chest when the belt is worn and is flipped up when the belt is not worn. A pair of elastic left and right belts provided with webbing insertion holes at one end; and
The seat cushion extends through the webbing guides provided at the left and right side parts of the seatback height direction intermediate part, extends between the left and right webbing guides, and extends from the webbing guide to the left and right side parts at the upper end of the seat cushion when the pretensioner is not operated. A webbing that extends from the left and right sides of the upper end to the webbing insertion hole at one end of the band, and that extends from the webbing guide to the webbing insertion hole at one end of the band when the pretensioner is activated;
A first retractor with a pretensioner connected to an end portion of the webbing, a lap belt separately attached to the webbing and attached with a tongue inserted into and removed from the buckle at one end;
A second retractor coupled to the other end of the lap belt;
A seat belt device comprising:   The seat belt device according to claim 1, further comprising torque transmitting means for transmitting a torque of rotation of the second retractor accompanying the operation of attaching and detaching the lap belt as a torque of rotation of the belt body rotation shaft. The seat belt device according to claim 1 or 2, further comprising: a second belt member that is connected to one side portion of the seat cushion on the connection side to the second retractor of the lap belt and passes through the lap belt.
  The seatbelt apparatus of any one of Claims 1-3 in which the airbag developed by the passenger | crew head side is accommodated in the said left-right paired belt body.   The seat belt device according to any one of claims 1 to 4, wherein the belt supports the webbing so that the webbing is separated from the belt when the pretensioner is operated.   The webbing hanger provided on the left and right side portions of the upper end of the seat back includes a webbing hanger that supports the webbing so that the webbing is detached from the webbing hanger when the pretensioner is operated. The seat belt device according to the description. Detection means for detecting whether the buckle and the tongue plate are attached or not;
Driving means for rotating the belt,
Control means for controlling the drive means based on the detection result of the detection means;
The seat belt device according to claim 1, further comprising:

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