JP7365231B2 - seat belt device - Google Patents

Description

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

For example, three-point seatbelts are widely used to restrain occupants seated in the seats of vehicles such as automobiles and to prevent injuries in the event of a collision.
The three-point seat belt includes a lap belt section that extends in the vehicle width direction along the front surface of the occupant's waist, and a shoulder belt section that extends obliquely along the front surface of the occupant's chest.

As a conventional technology related to three-point seat belts, for example, Patent Document 1 discloses that a three-point seat belt has first and second tongues through which webbing is sequentially inserted into a buckle portion where the seat belt is folded back from the lap belt side to the shoulder belt side. It is described that plates are provided one after another and are relatively rotatable in the direction of separation.

Japanese Patent Application Publication No. 2007-237754

Seat belt devices are an effective means for reducing chest injuries to occupants and secondary collisions with other parts in the vehicle cabin in frontal collisions.
However, in the case of a three-point seat belt with a diagonal shoulder belt, the tongue side (lower side) of the shoulder belt is affected by behavior such as tilting the upper body forward, or by a pretensioner etc. When the ribs rise upward relative to the chest due to the retraction, the area around the ribs may be compressed upward and bending force may be generated in the ribs.
In view of the above-mentioned problems, an object of the present invention is to provide a seat belt device that reliably suppresses compression of the chest by a shoulder belt with a simple configuration.

The present invention solves the above-mentioned problems by the following solving means.
The invention according to claim 1 provides a lap belt portion at least partially disposed across the vehicle width direction along the front of the occupant's waist, and at least a portion disposed diagonally along the front of the occupant's chest. a webbing having a shoulder belt portion that is attached to the webbing; a first tongue and a second tongue that are sequentially provided between the lap belt portion and the shoulder belt portion of the webbing and are connected to the vehicle body when worn; In conjunction with the displacement of the first tongue toward the front of the vehicle, the webbing passing portion of the second tongue is spaced apart in the vehicle width direction from the webbing passing portion of the first tongue, and is relatively displaced upward. a buckle part that connects the first tongue and the vehicle body and swings relative to the vehicle body about an axis along the vehicle width direction; a transmission member that transmits a driving force to the interlocking mechanism section, the transmission member having a push rod protruding from the buckle section side in conjunction with the swinging of the buckle section. It is a device.
The invention according to claim 2 provides a lap belt portion at least partially disposed across the vehicle width direction along the front of the occupant's waist, and at least a portion disposed diagonally along the front of the occupant's chest. a webbing having a shoulder belt portion that is attached to the webbing; a first tongue and a second tongue that are sequentially provided between the lap belt portion and the shoulder belt portion of the webbing and are connected to the vehicle body when worn; In conjunction with the displacement of the first tongue toward the front of the vehicle, the webbing passing portion of the second tongue is spaced apart in the vehicle width direction from the webbing passing portion of the first tongue, and is relatively displaced upward. a buckle part that connects the first tongue and the vehicle body and swings relative to the vehicle body about an axis along the vehicle width direction; The seatbelt device includes a transmission member that transmits a driving force to the interlocking mechanism section, and the transmission member has a traction member that is pulled in conjunction with the swinging of the buckle section.
According to each of these inventions , the webbing passing portion of the second tongue, which is provided on the shoulder belt portion side of the first tongue and the second tongue, is displaced upward relative to the webbing passing portion of the first tongue. As a result, the contact portion of the shoulder belt portion with the occupant's chest can be displaced upward, and it is possible to prevent a strong compressive force from acting from the lower side of the ribs and increasing the possibility of harm to the occupant.
In addition, at this time, by separating the webbing passing portion of the second tongue and the webbing passing portion of the first tongue in the vehicle width direction, twisting and unreasonable bending of the webbing can be suppressed, and the above-mentioned webbing of the second tongue can be Passing points can be ascended smoothly.
Furthermore, by linking the relative displacement between the first tongue and the second tongue with the displacement of the first tongue toward the front of the vehicle at the time of a vehicle collision, the occupant moves forward relative to the vehicle body in the event of a collision, and the traction force of the lap belt is reduced. Utilizing the behavior in which the first tongue moves forward, the above-mentioned effects can be reliably obtained with a simple configuration that does not require a dedicated actuator or the like.

Furthermore, the above-mentioned effects can be reliably obtained by utilizing the swinging of the buckle portion to which the first tongue is connected.

The invention according to claim 3 provides a lap belt portion, at least a portion of which is disposed across the vehicle width direction along the front of the occupant's waist, and at least a portion of which is disposed diagonally along the front of the occupant's chest. a webbing having a shoulder belt portion that is attached to the webbing; a first tongue and a second tongue that are sequentially provided between the lap belt portion and the shoulder belt portion of the webbing and are connected to the vehicle body when worn; In conjunction with the displacement of the first tongue toward the front of the vehicle, the webbing passing portion of the second tongue is spaced apart in the vehicle width direction from the webbing passing portion of the first tongue, and is relatively displaced upward. a buckle part that connects the first tongue and the vehicle body and swings relative to the vehicle body about an axis along the vehicle width direction; a transmission member that transmits a driving force to the interlocking mechanism, the interlocking mechanism driving the transmission member via a speed change mechanism that reduces or increases the angular velocity when the buckle swings. This is a seat belt device featuring :
According to this, the first tongue and the second tongue are relatively displaced by decelerating or increasing the angular velocity when the buckle part swings via the transmission mechanism and then transmitting it as the driving force of the interlocking mechanism. The operating speed and operating force can be optimized.

As described above, according to the present invention, it is possible to provide a seat belt device that reliably suppresses compression of the chest by the shoulder belt with a simple configuration.

1 is a perspective view schematically showing the configuration of a first embodiment of a seat belt device to which the present invention is applied. FIG. 3 is a schematic external view of a first tongue and a second tongue in the seat belt device of the first embodiment, showing a state before a collision. FIG. 2 is a schematic external view of a first tongue and a second tongue in the seat belt device of the first embodiment, showing a state after a collision. FIG. 3 is a schematic cross-sectional view of the locking mechanism of the second tongue in the seat belt device of the first embodiment, showing a free state. FIG. 6 is a schematic cross-sectional view of the locking mechanism of the second tongue in the seat belt device of the first embodiment, showing a locked state. FIG. 3 is a schematic diagram of the first tongue, second tongue, and buckle peripheral portions in the first embodiment viewed from the vehicle width direction, and is a diagram showing a state before a collision. FIG. 3 is a schematic diagram of the first tongue, second tongue, and buckle peripheral portions in the first embodiment viewed from the vehicle width direction, and is a diagram illustrating the state after a collision. FIG. 2 is a block diagram schematically showing the configuration of a control system in the seat belt device of the first embodiment. FIG. 2 is a perspective view schematically showing a state after the relative displacement between the first tongue and the second tongue is completed in the seat belt device of the first embodiment. FIG. 2 is a schematic diagram of a first tongue, a second tongue, and a peripheral portion of a buckle in a second embodiment of a seat belt device to which the present invention is applied, as viewed from the vehicle width direction, and is a diagram showing a state before a collision. FIG. 7 is a schematic diagram of a first tongue, a second tongue, and a peripheral portion of a buckle in a third embodiment of a seat belt device to which the present invention is applied, as viewed from the vehicle width direction, and is a diagram showing a state before a collision.

<First embodiment>
Hereinafter, a first embodiment of a seat belt device to which the present invention is applied will be described.
The seatbelt device of the first embodiment is a three-point seatbelt provided in a front seat of a vehicle such as a passenger car, where an occupant is seated facing forward.

FIG. 1 is a perspective view schematically showing the configuration of a seat belt device according to a first embodiment.
The seat 10 on which the occupant P sits has a cushion 11 and a seat back 12.
The cushion 11 is provided at the lower part of the seat 10 and has a seat surface on which the buttocks and thighs of the occupant P are placed.
The seat back 12 is a portion that is provided to protrude upward from near the rear end of the seat portion and holds the back, shoulders, etc. of the occupant P.

A B-pillar 20 is provided on one side of the seat 10 in the vehicle width direction.
The B-pillar 20 is a columnar vehicle body structural member that extends in the vertical direction along the rear edge of a door opening through which the occupant P gets in and out.
The seat belt device 100 includes a webbing 110, a retractor 120, a lap pretensioner 130, a shoulder anchor 140, a first tongue 150, a second tongue 160, a buckle 170, a tongue separation mechanism 180, and the like.

The webbing 110 is a flexible belt-shaped member made of, for example, a knitted fabric of polyester fibers.
The webbing 110 has a lap belt part 111 and a shoulder belt part 112, with the first tongue 150 and the second tongue 160, through which the middle part thereof is inserted and folded, as boundaries.
The lap belt portion 111 is arranged to extend in the vehicle width direction, mainly along the front of the waist of the occupant P.
The shoulder belt portion 112 is arranged mainly along the front of the chest of the occupant P.
The shoulder belt portion 112 is arranged obliquely so that the B-pillar 20 side in the vehicle width direction is higher.

The retractor 120 is connected to the end of the webbing 110 on the shoulder belt 112 side, and is attached to the lower part of the B-pillar 20.
The retractor 120 has a function of winding up and storing the excess portion of the webbing 110.
Webbing 110 is adapted to be pulled upward from retractor 120.
The retractor 120 is provided with a shoulder pretensioner 121 (see FIG. 8) that pulls the shoulder belt portion 112 in accordance with a command from a control unit using an actuator using, for example, a gunpowder-type gas generator.

The lap pretensioner 130 is provided near the lower end of the B-pillar 20 of the vehicle body, and is connected to the outer end in the vehicle width direction of the lap belt portion 111 of the webbing 110.
The lap pretensioner 130 has a function of pulling the lap belt portion 111 in response to a command from the seat belt control unit 210 using, for example, an actuator using a gunpowder type gas generator.

The shoulder anchor 140 is provided near the upper end of the B-pillar 20 of the vehicle body, and the shoulder belt portion 112 of the webbing 110 pulled upward from the retractor 120 is diagonally downward toward the first tongue 150 and second tongue 160 side. This is the part that is folded back.
The shoulder anchor 140 is rotatable about an axis substantially along the vehicle width direction with respect to the B-pillar 20, and the webbing 110 is rotatable between the retractor 130 side and the first tongue 150 and second tongue 160 sides. It is designed not to obstruct passage.

The first tongue 150 and the second tongue 160 are members that are removably attached to the buckle 170 with the webbing 110 inserted therethrough.
FIG. 2 is a schematic external view of the first tongue and the second tongue, showing the state before the collision.
FIG. 2(a) is a view taken along the line II-II in FIG.
FIG. 2(b) is a view taken along the line bb in FIG. 2(a).
FIG. 2(c) is a view along the line cc of FIG. 2(a).
FIG. 3 is a schematic external view of the first tongue and the second tongue, showing the state after the collision (the state after deployment).
3(a) and 3(b) are views seen from the same direction as FIG. 2(a) and FIG. 2(b), respectively (FIG. 3(b) is a view taken along the line bb in FIG. 3(a). (view).

The main body portions of the first tongue 150 and the second tongue 160 are portions through which the webbing 110 is inserted in a folded state between the lap belt portion 111 side and the shoulder belt portion 112 side.
The main body is made of a combination of metal materials, hard resin materials, etc., so as to have sufficient strength against the maximum tension that is applied to the webbing 110 when a collision occurs, for example. (Each figure is simplified.)

The first tongue 150 and the second tongue 160 function as an integral tongue in an adjacent state when there is no collision.
The first tongue 150 is provided closer to the occupant P in the vehicle width direction than the second tongue 160 (in the case of the present embodiment, on the outside in the vehicle width direction).
The lap belt section 111 is pulled out from the first tongue 150, and the shoulder belt section 112 is pulled out from the second tongue 160.

The main body portions of the first tongue 150 and the second tongue 160 have slits through which the webbing 110 is inserted.
Tongue plates 151 and 161 protrude from below the first tongue 150 and the second tongue 160.
The tongue plates 151 and 161 are made of a metal material such as a steel plate and are formed into a flat plate shape.
The upper parts of the tongue plates 151 and 161 are embedded and fixed in the lower parts of the main bodies of the first tongue 150 and the second tongue 160 by insert molding or the like.
A lower portion of the tongue plate 151 of the first tongue 150 is removably connected to a buckle 170 .
The lower part of the tongue plate 161 of the second tongue 160 is swingably connected to the tongue plate 151 of the first tongue 150 via a spherical bearing B.

Further, the second tongue 160 restrains the webbing 110 when the tension of the webbing 110 exceeds a predetermined value, and moves the webbing 110 between the lap belt section 111 side (first tongue 150 side) and the shoulder belt section 112 side. The locking tongue is prohibited.
The locking mechanism of the second tongue 160 as a locking tongue will be described below.

4 and 5 are schematic cross-sectional views of the locking mechanism of the second tongue in the seat belt device of the first embodiment, showing a free state and a locked state, respectively.
In addition to the tongue plate 161 described above, the second tongue 160 further includes a space 162, a lap belt slit 163, a shoulder belt slit 164, a lock member 165, and the like.

The space portion 162 is a hollow portion formed inside the main body portion, and accommodates a portion of the webbing 110, the lock member 165, and the like.
A sliding surface 162a and a lock recess 162b are formed on the inner surface of the space 162.
The sliding surface portion 162a is formed in a concave curved shape, contacts the sliding surface portion 165a of the locking member 165, and slides on the sliding surface portion 165a when the locking member 165 is operated.
The sliding surface portion 162a is formed on the inner surface of the region between the lap belt slit 163 and the shoulder belt slit 164 in the main body portion.
The lock recess 162 is a portion that cooperates with the lock member 165 to clamp and lock the webbing 110 when a predetermined tension or more is applied to the webbing 110 and the lock member 165 moves.
The lock recess 162b is formed on the inner surface of the space 162 in an area adjacent to the sliding surface 162a with the shoulder belt slit 164 in between.

The lap belt slit 163 and the shoulder belt slit 164 are openings that are formed to penetrate from the surface of the main body part to the inside of the space part 162, and through which the webbing 110 is inserted.
The lap belt slit 163 and the shoulder belt slit 164 are formed as elongated slits having a longitudinal direction along the width direction of the webbing 110 (direction perpendicular to the paper plane in FIGS. 4 and 5).
The lap belt slit 163 allows the end of the lap belt portion 111 to be introduced into the space 162 via the first tongue 150.
The shoulder belt slit 164 allows the end of the shoulder belt portion 112 to be introduced into the space 162 .

The lock member 165 is disposed inside the space 162 and is movable to move from a free (released) position where the webbing 110 is allowed to pass to a locked position where the webbing 110 is restrained as the tension of the webbing 110 increases. It is a member.
The locking member 165 includes a sliding surface portion 165a, a webbing contact portion 165b, a webbing restraining portion 165c, and the like.

The sliding surface portion 165a is a convex curved portion that slidably contacts the sliding surface portion 162a on the inner surface 162 of the main body portion.
The webbing contact portion 165b is a convex portion (folded portion) that is provided on one end side (lower side in FIGS. 5 and 6) of the sliding surface portion 165a and comes into contact with a folded portion of the webbing 110.
The webbing contact portion 165b is arranged so as to be tilted rearward so that the lower end thereof is on the front side of the vehicle with respect to the upper end thereof when viewed from the side during normal use of the vehicle.
When the locking mechanism of the second tongue 160 is in the locked state, the webbing restraint part 165c works with the lock recess 162b to clamp and restrain the webbing 110, and prevents the webbing 110 from being separated between the lap belt part 111 side and the shoulder belt part 112 side. The webbing 110 is locked so that it does not move past the second tongue 160 between the two tongues.
The webbing restraining portion 165c is provided at the end of the sliding surface portion 165a opposite to the webbing contact portion 165b (upper side in FIGS. 4 and 5).

The webbing 110 is folded back from the lap belt section 111 side to the shoulder belt section 112 side at the webbing contact section 165b.
When the locking mechanism of the second tongue 160 is in the free state, the webbing 110 can freely pass through the second tongue 160 by sliding along the surface of the webbing contact portion 165b (on the lap belt portion 111 side or on the shoulder). (can pass to the belt portion 112 side).

When the tension acting on the webbing 110 increases during a vehicle collision, the locking mechanism of the second tongue 160 shifts from the free state shown in FIG. 5 to the locked state shown in FIG. 6.
The locking member 165 is pulled upward in FIGS. 5 and 6 by the tension of the webbing 110, and the sliding surface portions 162a and 165a move while sliding against each other.
At the end of the movement range of the locking member 165, the webbing restraining portion 165c of the locking member 165 restrains the webbing 110 between it and the lock recess 162b formed in the space 162.

The buckle 170 is attached to a location inside the cushion 11 of the seat 10 in the vehicle width direction and close to the rear end of the vehicle body so as to be swingable around a rotation center axis along the vehicle width direction.
The buckle 170 has an engagement mechanism that engages with the tongue plate 161 of the second tongue 160 when it is inserted, a release mechanism that releases the engagement mechanism, and the like.
A release button 171 for releasing the release mechanism is provided on the inside surface of the buckle 170 in the vehicle width direction.

The tongue separation mechanism 180 allows the first tongue 150, the second tongue 160, and the buckle 170 to move when the body of the occupant P moves toward the front of the vehicle due to inertia and a significant tension is generated in the lap belt portion 111 during a collision. , the first tongue 150 and the second tongue 160 are moved in conjunction with the behavior in which the upper end portion swings forward and downward around a rotating shaft 170a provided at the base of the buckle 170 and along the vehicle width direction. This is an interlocking mechanism that allows relative displacement from the state shown in FIG. 2 to the state shown in FIG.
FIGS. 6 and 7 are schematic diagrams of the first tongue, second tongue, and buckle periphery in the first embodiment viewed from the vehicle width direction, and are diagrams showing the states before and after the collision, respectively.

As shown in FIGS. 6 and 7, the tongue separation mechanism 180 is provided at a connection point of the tongue plate 151 of the first tongue 150 with the tongue plate 161 of the second tongue 160 (near the spherical bearing B).
The tongue separating mechanism 180 is provided with a push rod 181.
One end of the push rod 181 is swingably connected to a connecting portion provided on the cushion 11 of the seat 10 on the front side and diagonally downward side of the rotating shaft 170a of the buckle 170.
The other end of the push rod 181 is connected to an input portion of the tongue spacing mechanism 180.
In addition, it is preferable that the push rod 181 is divided in the middle so as not to hinder the removal of the first tongue 150 from the buckle 170.

When the first tongue 150 and the buckle 170 rotate about the rotating shaft 160a in the forward direction from the state shown in FIG. 6 to the state shown in FIG. 7, the push rod 181 is pushed into the tongue separation mechanism 180.
The tongue separation mechanism 180 converts the pressing force from the push rod 181 into a force in a direction to relatively displace the first tongue 150 and the second tongue 160 using various mechanisms such as a gear mechanism, a link mechanism, and a cam mechanism. .

The seat belt device 100 has a control system described below.
FIG. 8 is a block diagram schematically showing the configuration of a control system in the seat belt device of the first embodiment.
The control system 200 includes a seat belt control unit 210, a seating sensor 220, a seat belt wearing sensor 230, an acceleration sensor 240, an environment recognition unit 250, and the like.

The seat belt control unit 210 detects a collision or its precursor, and gives commands to each actuator (pretensioner) provided in the seat belt device 100.
The seating sensor 220 is a load sensor provided on the cushion 11 of the seat 10 and detects whether the occupant P is seated on the seat 10.
The seat belt wearing sensor 230 is provided on the buckle 170 and detects a state in which the first tongue 150 and the second tongue 160 are connected to the buckle 170 (seat belt wearing state).

The acceleration sensor 240 is provided, for example, at the front end of the vehicle body, and detects acceleration acting on the vehicle body in the front-rear direction or the like.
Acceleration sensor 240 is used as a sensor for detecting a vehicle collision.

The environment recognition unit 250 uses various sensors and communication such as vehicle-to-vehicle communication and road-to-vehicle communication to determine information about the shape of the road around the vehicle, other vehicles, pedestrians, buildings, terrain, obstacles such as trees, etc. It is used to recognize information, etc.
A stereo camera device 251, a millimeter wave radar device 252, a laser scanner device 253, a communication device 254, and the like are connected to the environment recognition unit 250.

The stereo camera device 251 includes a pair of cameras arranged with their imaging range facing the front of the vehicle and spaced apart in the vehicle width direction, and an image processing unit that performs known stereo image processing on images captured by each camera.
The millimeter wave radar device 252 detects the relative position, relative speed, etc. of an obstacle present in front of the vehicle, etc., with respect to the vehicle, using radio waves of, for example, 30 to 300 GHz.
The laser scanner device 253 is a 3D LIDAR that detects the shape and position of obstacles around the vehicle by emitting pulsed laser light and measuring scattered light.
The communication device 254 acquires information regarding obstacles that are difficult to detect by the above-mentioned sensors (for example, other vehicles appearing from a place blocked by a building, etc.) through vehicle-to-vehicle communication and road-to-vehicle communication.
The environment recognition unit 250 has a function of detecting a state where the possibility of a collision occurring is extremely high (a precursor to a collision) prior to an actual collision of the vehicle.
The seatbelt control unit 210 operates the shoulder pretensioner 121 and the lap pretensioner 130 in response to a sign of a collision.

FIG. 9 is a perspective view schematically showing a state after the relative displacement between the first tongue and the second tongue is completed in the seat belt device of the first embodiment.
In the first embodiment, the second tongue 160 separates from the first tongue 150 in the vehicle width direction in conjunction with the rotation of the buckle 170 in the forward direction (counterclockwise in FIGS. 6 and 7) at the time of a collision. , and by rotating in the upward swinging direction, the entire position where the shoulder belt part 112 passes moves upward, and the part where the shoulder belt part 112 contacts the chest of the occupant P also moves upward. .

As explained above, according to the first embodiment, the following effects can be obtained.
(1) Between the first tongue 150 and the second tongue 150, the webbing passage point (body part) of the second tongue 160 provided on the shoulder belt part 112 side is relative to the webbing passage place (main body part) of the first tongue 150. By relatively displacing the shoulder belt portion 112 upwardly, the contact portion of the shoulder belt portion 112 with the occupant P's chest can be displaced upwardly, and a strong compressive force acts from the lower side of the ribs, increasing the degree of harm to the occupant. This can be prevented.
Further, at this time, by separating the webbing passing portion of the second tongue 160 and the webbing passing portion of the first tongue 150 in the vehicle width direction, twisting or unreasonable bending of the webbing 110 is suppressed, and the above-mentioned second The webbing passage point of the tongue can be raised smoothly.
Furthermore, by linking the relative displacement between the first tongue 150 and the second tongue 160 with the displacement of the first tongue 150 toward the front of the vehicle at the time of a vehicle collision, the occupant P moves forward with respect to the vehicle body at the time of a collision, and Utilizing the behavior in which the first tongue 150 moves forward as the tractive force of the belt portion 111 increases, the above-mentioned effects can be reliably obtained with a simple configuration that does not require a dedicated actuator or the like.
(2) By providing the push rod 181 that transmits the driving force to the tongue separating mechanism 180 in conjunction with the swinging of the buckle 170, the above-mentioned effects can be reliably obtained with a simple configuration.

<Second embodiment>
Next, a second embodiment of a seat belt device to which the present invention is applied will be described.
In the second embodiment, the same parts as in the first embodiment described above are given the same reference numerals, and the explanation will be omitted, and the differences will be mainly explained.
FIG. 10 is a schematic diagram of the first tongue, the second tongue, and the buckle peripheral portion in the first embodiment, viewed from the vehicle width direction, and is a diagram showing a state before a collision.
In the second embodiment, a drive gear 182 and a driven gear 183 are provided.
The drive gear 182 is an externally toothed spur gear arranged concentrically with the rotation center axis 170a of the buckle 170, and is fixed to the cushion 11 of the seat 10 (fixed to the vehicle body).
The driven gear 183 is an externally toothed spur gear that is rotatably attached to the tongue plate 151 of the first tongue 150 around a rotation center axis.
Driven gear 183 meshes with drive gear 182.
In the second embodiment, the end of the push rod 181 on the side opposite to the tongue separation mechanism 180 is swingably connected to the driven gear 183.
A connecting portion between the push rod 181 and the driven gear 183 is arranged above and diagonally rearward with respect to the rotation center axis of the driven gear 183.

In the second embodiment, when the buckle 170 and the like rotate in the forward direction, the driven gear 183 rotates in the counterclockwise direction in FIG. 10 .
As a result, the push rod 181 is pushed toward the tongue separating mechanism 180 side.
In the second embodiment, the number of teeth of the driven gear 183 is set to be larger than the number of teeth of the drive gear 182.
Therefore, the angular velocity when the driven gear 183 rotates is reduced relative to the angular velocity when the buckle 170 rotates, and the torque is increased.

According to the second embodiment described above, in addition to the same effects as those of the first embodiment described above, the buckle 170 swings through the gear train (transmission mechanism) consisting of the drive gear 182 and the driven gear 183. Optimization of the operating speed and operating force when the first tongue 150 and the second tongue 160 are displaced relative to each other by reducing the angular velocity when the first tongue 150 and the second tongue 160 are displaced relative to each other by transmitting the driving force to the tongue separating mechanism 180, which is an interlocking mechanism. can be achieved.

<Third embodiment>
Next, a third embodiment of a seat belt device to which the present invention is applied will be described.
In the seat belt device of the third embodiment, the tongue separating mechanism 180 is driven by a wire 184, which will be described below, instead of the push rod 181 in the seat belt device of the second embodiment.
One end of wire 184 is connected to tongue spacing mechanism 180.
The other end of the wire 184 is swingably connected to the driven gear 183.
The connecting portion between the wire 184 and the driven gear 183 is arranged below and diagonally forward with respect to the rotation center axis of the driven gear.

In the third embodiment, when the buckle 170 and the like rotate in the forward direction, the driven gear 183 rotates in the counterclockwise direction in FIG. 11.
This causes the wire 184 to be pulled.
The tongue separating mechanism 180 uses the pulling force of the wire 184 to separate the first tongue 150 and the second tongue 160.
Also in the third embodiment described above, effects similar to those of the second embodiment described above can be obtained.

(Modified example)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The configurations of the vehicle and the seat belt device are not limited to the above-described embodiments, and can be modified as appropriate.
For example, the shape, structure, function, arrangement, number, etc. of each part constituting the seat belt can be changed as appropriate.
(2) The structure of the mechanism for relatively displacing the first tongue and the second tongue in each embodiment is an example, and can be changed as appropriate.
(3) In each embodiment, the second tongue is provided with a locking mechanism to form a locking tongue, but instead of this, the first tongue may be provided with a locking mechanism. Alternatively, the first tongue and the second tongue may not be provided with a locking mechanism.
(4) In each embodiment, the first tongue and the second tongue connected to a single buckle are configured to be relatively displaced, but instead of this, the buckle can be connected to the first tongue and the second tongue, respectively. A configuration may also be adopted in which the first tongue and the second tongue are provided separately and are relatively displaced together with the corresponding buckle.
(5) In the second and third embodiments, the rotational speed at which the buckle swings is reduced by the gear train, but the rotational speed at which the buckle swings may be increased instead. In this case, the relative displacement of the first tongue 150 and the second tongue 160 can be accelerated.

10 Seat 11 Cushion 12 Seat back 20 B-pillar 100 Seat belt device 110 Webbing 111 Lap belt portion 112 Shoulder belt portion 120 Retractor 121 Shoulder retractor 130 Lap pretensioner 140 Shoulder anchor 150 First tongue 151 Tongue plate 160 Second tongue 161 Ta plate 162 Space portion 162a Sliding surface portion 162b Lock concave portion 163 Lap belt slit 164 Shoulder belt slit 165 Lock member 165a Sliding surface portion 165b Webbing contact portion 165c Webbing restraining portion 166 Tongue plate 170 Buckle 171 Release button 180 Tongue separation mechanism 181 Push rod 182 Drive gear 183 Driven gear 184 Wire 200 Control system 210 Seat belt control unit 220 Seating sensor 230 Seat belt wearing sensor 240 Acceleration sensor 250 Environment recognition unit 251 Stereo camera device 252 Millimeter wave radar device 253 Laser scanner device 254 Communication device

Claims (3)

Webbing having a lap belt portion, at least a portion of which is disposed across the vehicle width direction along the front of the occupant's waist, and a shoulder belt portion, at least a portion of which is disposed obliquely along the front of the occupant's chest. and,
a first tongue and a second tongue that are sequentially provided between the lap belt portion and the shoulder belt portion of the webbing and are connected to the vehicle body when worn;
In conjunction with the displacement of the first tongue toward the front of the vehicle at the time of a vehicle collision, the webbing passing portion of the second tongue is spaced apart in the vehicle width direction and upward relative to the webbing passing portion of the first tongue. an interlocking mechanism for relatively displacing the
a buckle portion that connects the first tongue and the vehicle body and swings relative to the vehicle body around an axis along the vehicle width direction;
a transmission member that transmits a driving force to the interlocking mechanism in conjunction with the swinging of the buckle;
Equipped with
The transmission member may include a push rod that protrudes from the buckle side in conjunction with the swinging of the buckle.
A seat belt device featuring : Webbing having a lap belt portion, at least a portion of which is disposed across the vehicle width direction along the front of the occupant's waist, and a shoulder belt portion, at least a portion of which is disposed obliquely along the front of the occupant's chest. and,
a first tongue and a second tongue that are sequentially provided between the lap belt portion and the shoulder belt portion of the webbing and are connected to the vehicle body when worn;
In conjunction with the displacement of the first tongue toward the front of the vehicle at the time of a vehicle collision, the webbing passing portion of the second tongue is spaced apart in the vehicle width direction and upward relative to the webbing passing portion of the first tongue. an interlocking mechanism for relatively displacing the
a buckle portion that connects the first tongue and the vehicle body and swings relative to the vehicle body around an axis along the vehicle width direction;
a transmission member that transmits a driving force to the interlocking mechanism in conjunction with the swinging of the buckle;
Equipped with
The seat belt device, wherein the transmission member includes a traction member that is pulled in conjunction with the swinging of the buckle portion. Webbing having a lap belt portion, at least a portion of which is disposed across the vehicle width direction along the front of the occupant's waist, and a shoulder belt portion, at least a portion of which is disposed obliquely along the front of the occupant's chest. and,
a first tongue and a second tongue that are sequentially provided between the lap belt portion and the shoulder belt portion of the webbing and are connected to the vehicle body when worn;
In conjunction with the displacement of the first tongue toward the front of the vehicle at the time of a vehicle collision, the webbing passing portion of the second tongue is spaced apart in the vehicle width direction and upward relative to the webbing passing portion of the first tongue. an interlocking mechanism for relatively displacing the
a buckle portion that connects the first tongue and the vehicle body and swings relative to the vehicle body around an axis along the vehicle width direction;
a transmission member that transmits a driving force to the interlocking mechanism in conjunction with the swinging of the buckle;
Equipped with
The seat belt device is characterized in that the interlocking mechanism section drives the transmission member via a speed change mechanism that reduces or increases the angular velocity when the buckle section swings.

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