JP6846277B2 - Locking tongue and seatbelt device for seatbelts - Google Patents

Description

The present invention relates to a seatbelt locking tongue and a seatbelt device including the locking tongue.

In a seatbelt device mounted on a vehicle, when the seatbelt is fastened, the seatbelt is folded back into a shoulder belt and a waist belt with the tongue as a fulcrum. In the event of a vehicle collision, the shoulder belt may be pulled toward the waist belt as the occupant moves forward due to inertial force. Therefore, in order to suppress the forward movement of the occupant, it is desired to lock the seat belt with the tongue at the time of a collision to prevent the shoulder belt from being pulled (passed) toward the waist belt side.

For example, Patent Document 1 discloses a seatbelt locking tongue that can lock a seatbelt in the event of a collision. The locking tongue includes a tongue body in which a seatbelt insertion hole is formed and a locking member supported by the tongue body. When the seatbelt is fastened, the seatbelt is wrapped around the lock member so as to be folded back around the shoulder belt and the waist belt passing through the seatbelt insertion hole of the tongue body.

The lock member is usually maintained in a state in which the urging force of the urging member forms a gap larger than the thickness of the seatbelt between the locking member and the holding portion extending along the seatbelt insertion hole in the tongue body. .. As a result, the slidability of the seatbelt with respect to the locking tongue is ensured, and the operability when the seatbelt is fastened and the comfort during the seatbelt wearing are ensured.

On the other hand, when the shoulder belt is pulled toward the waist belt, the lock member rotates 90 degrees accordingly. As a result, the lock member is prevented from further rotating and can move toward the holding portion. When the waist belt is further pulled in this state, the lock member moves toward the sandwiching portion, and the seat belt is sandwiched between the locking member and the sandwiching portion. As a result, the pulling (passing) of the shoulder belt toward the waist belt is stopped.

Japanese Unexamined Patent Publication No. 2016-60457

As described above, in the locking tongue disclosed in Patent Document 1, the lock member first rotates 90 degrees from the time when the shoulder belt starts to be pulled toward the waist belt side until the pulling is stopped, and then the lock member is rotated. Move toward the pinch. Therefore, it takes some time from when the shoulder belt starts to be pulled toward the waist belt until it is stopped.

Therefore, an object of the present invention is to provide a locking tongue capable of stopping the pulling (passing) of the shoulder belt toward the waist belt side in an extremely short time, and to provide a seatbelt device including the locking tongue. And.

In order to solve the above problems, the seatbelt locking tongue of the present invention has a seatbelt insertion hole through which the seatbelt is inserted, allows the seatbelt to pass through in normal times, and allows the seatbelt to pass through in the event of a vehicle collision. A seatbelt locking tongue that prevents passage in one direction, a main wall in which the seatbelt insertion hole is formed, and a thickness of the seatbelt provided inside the seatbelt insertion hole. A main wall having sandwiching portions and abutting portions facing each other in the direction, and a pair of side walls located on both sides of the seatbelt insertion hole in the width direction of the seatbelt and projecting from one surface of the main wall. The tongue body including the tongue and the seat belt are wound around the shoulder belt and the waist belt passing through the seat belt insertion hole so as to be folded back, and actuated by the tension of the seat belt between the holding portion of the main wall. A lock member that sandwiches the seatbelt, has a claw portion that abuts the abutting portion of the main wall in the seatbelt insertion hole, and the seat between the claw portion and the sandwiching portion. It is movable and said that it can move between a standby position where a gap larger than the thickness of the belt is formed and an operating position where the amount of penetration of the claw portion into the seatbelt insertion hole is larger than the standby position. It is rotatably supported by the pair of side walls between a first state in which the claw portion abuts on the abutting portion and a second state in which the claw portion separates from the abutting portion toward the holding portion. The locking member and the locking member are urged in the direction of moving from the operating position to the standby position, and the locking member is urged in the direction of rotating from the second state to the first state. The urging force that urges the lock member in the direction of rotating the lock member from the second state to the first state is a direction in which the lock member is moved from the operating position to the standby position. It is characterized by being larger than the urging force that urges.

According to the above configuration, normally, the lock member is maintained in the standby position in the first state in which the claw portion abuts on the abutting portion by the urging force of the urging member. Therefore, the slidability of the seatbelt with respect to the locking tongue is ensured, and the operability when the seatbelt is fastened and the comfort when the seatbelt is fastened are ensured. On the other hand, when the tension of the seat belt becomes large at the time of a vehicle collision or the like, the lock is maintained while the first state in which the claw portion abuts on the abutting portion is maintained due to the magnitude relationship between the two urging forces of the urging member. The member moves from the standby position to the operating position. Further, after the lock member has moved to the operating position, the lock member rotates from the first state to the second state due to the tension of the seat belt when the shoulder belt is pulled toward the waist belt side, and the claw portion and the holding portion The seat belt is sandwiched between. As a result, the pulling of the shoulder belt toward the waist belt is stopped. As described above, in the present invention, the lock member first moves from the standby position to the operating position, and then the seat belt is locked only by slightly rotating the lock member, so that the shoulder belt is pulled toward the waist belt side ( Passage) can be stopped in a very short time.

The lock member includes a lock bar provided with a claw portion and a shaft penetrating the lock bar, and both ends of the shaft are placed between a standby position and an operating position on the pair of side walls. An elongated hole of a certain width may be formed to guide. According to this configuration, the lock member moving between the standby position and the operating position can be smoothly guided.

The contact portion may be inclined so as to approach the sandwiching portion in a direction away from the lock member with respect to the extending direction of the elongated hole. According to this configuration, when the lock member moves from the standby position to the operating position, the claw portion can be rotated so as to approach the holding portion while maintaining the lock member in the first state. Therefore, the pulling (passing) of the shoulder belt toward the waist belt can be stopped in a shorter time than when the contact portion is parallel to the extending direction of the elongated hole.

Further, the seatbelt device of the present invention is inserted into the seatbelt locking tongue, the buckle fixed to the vehicle with which the locking tongue is engaged, and the seatbelt insertion hole of the locking tongue, and one end thereof is inserted. It is characterized by including a seat belt fixed to the vehicle and a retractor for retractably accommodating the other end side of the seat belt. According to this configuration, the pulling (passing) of the shoulder belt to the waist belt side is stopped in an extremely short time at the time of a collision, so that a seatbelt device with improved occupant safety can be obtained.

According to the present invention, the pulling (passing) of the shoulder belt toward the waist belt can be stopped in an extremely short time.

It is a schematic block diagram of the seatbelt apparatus including the locking tongue for a seatbelt which concerns on one Embodiment of this invention. It is a perspective view which looked at the locking tongue from the front side. It is a perspective view which looked at the locking tongue from the back side. It is an exploded perspective view of the locking tongue. It is a perspective view of the shaft of a lock member. It is a partial sectional view of the locking tongue when the seat belt is not fastened. (A) is a partial cross-sectional view of the locking tongue located in the standby position when the seatbelt is fastened, and (b) is a partial side view of the locking tongue. (A) is a partial cross-sectional view of the locking tongue moved to the operating position, and (b) is a partial side view of the locking tongue. (A) is a partial cross-sectional view of the locking tongue rotated from the first state to the second state at the operating position, and (b) is a partial side view of the locking tongue. (A) is a partial cross-sectional view when the locking tongue of the modified example is located in the standby position, and (b) is a partial cross-sectional view when the locking tongue is moved to the operating position. (A) is a partial side view when the locking tongue of another modified example is located in the standby position, and (b) is a partial side view when the locking tongue is moved to the operating position. It is a partial side view of the locking tongue of still another variant.

FIG. 1 shows a seatbelt device 1 including a seatbelt locking tongue 2 according to an embodiment of the present invention. The seatbelt device 1 is mounted on the vehicle 10, and includes a seatbelt 11, a retractor 12, and a buckle 14 in addition to the locking tongue 2.

The seatbelt 11 is inserted into the seatbelt insertion hole 32 described later in the locking tongue 2. One end of the seat belt 11 is fixed to the vehicle 10 via the belt anchor 15.

The retractor 12 accommodates the other end side of the seat belt 11 so that it can be pulled out. Further, the retractor 12 locks the drawer of the seat belt 11 in an emergency of the vehicle 10 (when the seat belt 11 is suddenly pulled out or when the acceleration of the vehicle 10 changes significantly). The seat belt 11 is slidably hung around the shoulder anchor 13 arranged above the retractor 12.

Although not shown, when the seatbelt is not fastened, the seatbelt 11 becomes straight from the shoulder anchor 13 to the belt anchor 15 due to the winding force of the retractor 12. When the seatbelt is fastened, the locking tongue 2 is engaged with the buckle 14 fixed to the vehicle 10, so that the seatbelt 11 is folded back into the shoulder belt 11a and the waist belt 11b with the locking tongue 2 as a fulcrum.

The locking tongue 2 normally allows the seatbelt 11 to pass through, and blocks the seatbelt 11 from passing in one direction when the vehicle 10 collides. Specifically, the locking tongue 2 includes a tongue body 3 and a lock member 4 supported by the tongue body 3, as shown in FIGS. 2 to 4.

The tongue body 3 includes a main wall 31 in which a slit-shaped seatbelt insertion hole 32 extending in the width direction of the seatbelt 11 is formed, and a pair of side walls 35 protruding from one surface of the main wall 31. The main wall 31 has a holding portion 33 and an abutting portion 34 that are provided inside the seatbelt insertion hole 32 and face each other in the thickness direction of the seatbelt 11. The side walls 35 are located on both sides of the seatbelt insertion hole 32 in the width direction of the seatbelt 11. Further, the tongue main body 3 includes an insertion portion 30 that protrudes from the center of one side of the main wall 31 (the side on the side of the holding portion 33 when viewed from the seatbelt insertion hole 32) and is inserted into the buckle 14. An engaging hole 30a for engaging with the buckle 14 is formed in the insertion portion 30.

The tongue body 3 is composed of a metal tongue plate 3A and a resin mold portion 3B that partially covers the tongue plate 3A. The insertion portion 30 is composed of only the tongue plate 3A, and the main wall 31 and the side wall 35 are composed of the tongue plate 3A and the mold portion 3B.

The lock member 4 extends so as to bridge the side wall 35 of the tongue body 3. When the seatbelt is fastened, the seatbelt 11 is wound around the lock member 4 so as to be folded back around the shoulder belt 11a and the waist belt 11b passing through the seatbelt insertion hole 32 (see FIG. 7A).

The lock member 4 is normally maintained in the state shown in FIG. 7A by the urging force of the urging member 5 described later, but when the waist belt 11b is pulled by a large tensile force, the tension of the seatbelt 11 is shown in the figure. The seatbelt 11 is sandwiched between the seatbelt 11 and the sandwiching portion 33 extending along the seatbelt insertion hole 32 in the main wall 31 by operating so as to be in the state shown in 9 (a).

Specifically, the lock member 4 includes a lock bar 41 and a shaft 44 penetrating the lock bar 41. The lock bar 41 and the shaft 44 are both made of metal. The lock bar 41 is provided with a through hole 42 extending in the longitudinal direction thereof. On the other hand, the shaft 44 is provided with knurled portions 45 inside the both ends exposed from the shaft 44. By press-fitting the knurled portion 45 into the through hole 42, the relative rotation between the shaft 44 and the lock bar 41 becomes impossible.

The lock bar 41 is provided with a claw portion 43 in the seatbelt insertion hole 32 that abuts on the abutting portion 34 extending along the seatbelt insertion hole 32 in the main wall 31. The lock member 4 is movable between the standby position shown in FIG. 7A and the operating position shown in FIG. 8A, and is in the first state shown in FIGS. 7A and 8A. It is rotatably supported by the side wall 35 between and the second state shown in FIG. 9 (a).

At the standby position shown in FIG. 7A, a gap larger than the thickness of the seat belt 11 is formed between the claw portion 43 and the holding portion 33. The operating position shown in FIG. 8A is a position where the amount of penetration of the claw portion 43 into the seatbelt insertion hole 32 is larger than that of the standby position. The first state shown in FIGS. 7 (a) and 8 (a) is a state in which the claw portion 43 is in contact with the contact portion 34, and the second state shown in FIG. 9 (a) is a state in which the claw portion 43 is sandwiched. It is in a state of being separated from the contact portion 34 toward the portion 33.

The side walls 35 of both sides are formed with elongated holes 36 into which both ends of the shaft 44 are fitted. Each elongated hole 36 has a constant width and extends in a direction in which the shoulder belt 11a is inclined toward the waist belt 11b toward the insertion portion 30 with respect to the thickness direction of the main wall 31 (). See FIG. 7 (a)). For example, the angle formed by the thickness direction of the main wall 31 and the extending direction of the elongated hole 36 is 20 to 60 degrees.

Each slot 36 guides the end of the shaft 44 between a standby position and an operating position. That is, the standby position is when the end of the shaft 44 is located at one end of the slot 36 (the side far from the seatbelt insertion hole 32), and the end of the shaft 44 is the other end of the slot 36 (seatbelt insertion hole). The operating position is when it is located on the side closer to 32).

Both ends of the shaft 44 project outward from both side walls 35. Further, a pair of urging members 5 for urging the lock member 4 are arranged on the outside of both side walls 35. In the present embodiment, a recess is formed on the outer surface of each side wall 35, and the urging member 5 is housed in the recess. The recess is closed by the cover 6.

The urging member 5 urges the lock member 4 in the direction of moving from the operating position to the standby position and in the direction of rotating from the second state to the first state. In the present embodiment, the urging member 5 includes a conical coil portion 53, a first end 51 extending outward from the coil portion 53, and a second end 52 extending inward from the coil portion 53. Is.

Specifically, as shown in FIG. 5, notches 46 are formed at both ends of the shaft 44, and the second end 52 of the torsion spring 5A is engaged with the notches 46 (FIG. 7 (FIG. 7). b) See). In FIG. 7B, the cover 6 is omitted in order to show the state of the torsion spring 5A (the same applies to FIGS. 8B and 9B described later). Further, each side wall 35 is formed with a mounting hole 37 into which the first end 51 of the torsion spring 5A is inserted.

The urging force F2 that urges the lock member 4 in the direction of rotating the lock member 4 from the second state to the first state is from the urging force F1 that urges the lock member 4 in the direction of moving from the operating position to the standby position. Is also big. In the present embodiment, the reason is that the conical coil portion 53 of the torsion spring 5A is more easily elastically deformed in the radial direction than being twisted. The coil portion 53 may have a tubular shape having a constant diameter. In this case, the first end 51 is more likely to be elastically deformed in the radial direction than the coil portion 53 of the torsion spring 5A is twisted.

Next, the operation of the locking tongue 2 when the seatbelt is fastened will be described with reference to FIGS. 7 (a) to 9 (b). When the seatbelt is not fastened, the locking tongue 2 is slanted with respect to the straight seatbelt 11, as shown in FIG.

As shown in FIGS. 7A and 7B, normally, in the lock member 4, the claw portion 43 abuts on the abutting portion 34 by the urging forces F1 and F2 of the urging member 5 (torsion spring 5A). It is maintained in the standby position in the first state. Therefore, the slidability of the seatbelt 11 with respect to the locking tongue 2 is ensured, and the operability when the seatbelt 11 is worn and the comfort when the seatbelt 11 is worn are ensured.

On the other hand, when the tension of the seatbelt 11 becomes large at the time of a vehicle collision or the like, as shown in FIGS. 8 (a) and 8 (b), depending on the magnitude relationship between the two urging forces F1 and F2 of the urging member 5. The coil portion 53 of the torsion spring 5A is elastically deformed mainly in the radial direction against the urging force F1, so that the lock member 4 keeps the first state in which the claw portion 43 abuts on the abutting portion 34. Move from the standby position to the operating position.

The cause of the increase in the tension of the seat belt 11 may be that the waist belt 11b is pulled by the forward movement of the occupant at the time of collision, and when the retractor 12 has a pretensioner function, the waist belt 11b may be pulled. The shoulder belt 11a may be pulled by operating the pretensioner function of the retractor 12 before the waist belt 11b is pulled at the time of collision.

In the present embodiment, the contact portion 34 is inclined so as to approach the holding portion 33 in the direction away from the lock member 4 with respect to the extending direction of the elongated hole 36. Therefore, when the lock member 4 moves from the standby position to the operating position, the claw portion 43 is rotated so as to approach the holding portion 33 while the lock member 4 is maintained in the first state. That is, the coil portion 53 of the torsion spring 5A is not only elastically deformed in the radial direction, but also slightly twisted against the urging force F2.

Since the seat belt 11 is not yet locked even if the lock member 4 moves to the operating position, when the retractor 12 has a pretensioner function, the lock member 4 stands by due to the winding force of the retractor 12. The waist belt 11b can be pulled toward the shoulder belt 11a not only during the movement from the position to the operating position but also when the movement to the operating position is completed.

After the lock member 4 has moved to the operating position, the tension of the seat belt 11 when the shoulder belt 111a is pulled toward the waist belt 11b due to the forward movement of the occupant causes the tension in FIGS. 9 (a) and 9 (b). As shown, the lock member 4 rotates from the first state to the second state against the urging force F2, and the seat belt 11 is sandwiched between the claw portion 43 and the sandwiching portion 33. As a result, the pulling (passing) of the shoulder belt 11a toward the waist belt 11b is stopped.

As described above, in the locking tongue 2 of the present embodiment, the lock member 4 first moves from the standby position to the operating position, and then the seat belt 11 is locked only by slightly rotating the lock member 4. The pulling (passing) of the shoulder belt 11a toward the waist belt 11b can be stopped in an extremely short time. The seatbelt device 1 including such a locking tongue 2 can improve the safety of the occupant.

In particular, when the retractor 12 has a pretensioner function, the waist belt 11b is pulled toward the shoulder belt 11a not only while the lock member 4 moves from the standby position to the operating position but also when the movement to the operating position is completed. be able to. Therefore, the waist belt 11b can be shortened in advance at the time of a collision, and the amount of forward movement of the occupant can be suppressed to a small size.

Further, in the present embodiment, since the elongated holes 36 into which both ends of the shaft 44 of the lock member 4 are fitted have a constant width, the lock member 4 that moves between the standby position and the operating position can be smoothly moved. Can guide you.

(Modification example)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

For example, as shown in FIG. 10A, the contact portion 34 may be parallel to the extending direction of the elongated hole 36. With this configuration, as shown in FIG. 10B, the lock member 4 moves from the standby position to the operating position without rotating. However, if the contact portion 34 is inclined with respect to the extending direction of the elongated hole 36 as in the above embodiment, the lock member 4 is first moved when the lock member 4 moves from the standby position to the operating position. The claw portion can be rotated so as to approach the holding portion while maintaining the state. Therefore, the pulling (passing) of the shoulder belt 11a toward the waist belt 11b can be stopped in a shorter time than when the contact portion 34 is parallel to the extending direction of the elongated hole 36.

Further, in the above embodiment, the mounting hole 37 into which the first end 51 of the torsion spring 5A is inserted is circular, but as shown in FIGS. 11A and 11B, the mounting hole 37 is an elongated hole. As a result, when the lock member 4 moves from the standby position to the operating position, the first end 51 may move in the mounting hole 37, so that the coil portion 53 of the torsion spring 5A may be twisted. In this case, since the second end 52 of the torsion spring 5A is shorter than the first end 51, the urging force acting on the second end 52 due to the twist of the coil portion 53 is larger than the urging force acting on the first end 51. The urging force F2 that urges the lock member 4 in the direction of rotating the lock member 4 from the second state to the first state urges the lock member 4 in the direction of moving the lock member 4 from the operating position to the standby position. It becomes larger than the urging force F1.

Further, as the urging member 5, various configurations can be adopted. For example, as shown in FIG. 12, the urging member 5 is a torsion spring 5B in which the first coil portion 55 that generates the urging force F1 and the second coil portion 56 that generates the urging force F2 are connected by an arm 57. There may be. Alternatively, the urging member 5 does not necessarily have to be a single member, and may be composed of, for example, two springs, a compression coil spring and a torsion spring.

1 Seatbelt device 10 Vehicle 11 Seatbelt 11a Shoulder belt 11b Waist belt 12 Retractor 14 Buckle 2 Locking tongue 3 Tongue body 31 Main wall 32 Seatbelt insertion hole 33 Holding part 34 Contact part 35 Side wall 36 Long hole 4 Lock member 41 Lock Bar 43 Claw 44 Shaft 5 Biasing member

Claims (4)

A seatbelt locking tongue that has a seatbelt insertion hole through which the seatbelt is inserted, allows the seatbelt to pass normally, and prevents the seatbelt from passing in one direction in the event of a vehicle collision.
A main wall in which the seatbelt insertion hole is formed, which is provided inside the seatbelt insertion hole and has a holding portion and an abutting portion facing each other in the thickness direction of the seatbelt, and a main wall. A tongue body including a pair of side walls located on both sides of the seatbelt insertion hole in the width direction of the seatbelt and projecting from one surface of the main wall.
The seatbelt is wound around the shoulder belt and the waist belt passing through the seatbelt insertion hole so as to be folded back, and the seatbelt is operated by the tension of the seatbelt to move the seatbelt between the holding portion of the main wall. It is a locking member to be sandwiched, and has a claw portion that abuts against the abutting portion of the main wall in the seatbelt insertion hole, and is more than the thickness of the seatbelt between the claw portion and the sandwiching portion. It is movable between a standby position where a large gap is formed and an operating position where the amount of penetration of the claw portion into the seatbelt insertion hole is larger than that of the standby position, and the claw portion is the contact. A lock member supported by the pair of side walls so as to be rotatable between a first state of contact with the contact portion and a second state in which the claw portion is separated from the contact portion toward the holding portion.
It is provided with an urging member that urges the lock member in a direction of moving from the operating position to the standby position and urges the lock member in a direction of rotating from the second state to the first state.
The urging force that urges the lock member in the direction of rotating the lock member from the second state to the first state urges the lock member in the direction of moving the lock member from the operating position to the standby position. A locking tongue for seat belts that is larger than the forces. The lock member includes a lock bar provided with the claw portion and a shaft penetrating the lock bar.
The locking tongue for a seat belt according to claim 1, wherein the pair of side walls are formed with elongated holes having a constant width for guiding both ends of the shaft between the standby position and the operating position. .. The locking tongue for a seat belt according to claim 2, wherein the abutting portion is inclined so as to approach the holding portion in a direction away from the locking member with respect to the extending direction of the elongated hole. The seatbelt locking tongue according to any one of claims 1 to 3.
A buckle fixed to the vehicle with which the locking tongue engages,
A seatbelt that is inserted into the seatbelt insertion hole of the locking tongue and one end of which is fixed to the vehicle.
A retractor that retracts the other end of the seat belt so that it can be pulled out.
A seatbelt device.

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