JP7160890B2 - seat belt device - Google Patents

Description

The present invention relates to seatbelt devices.

Conventionally, as a seat belt device, a so-called three-point seat belt device that protects a driver and a fellow passenger in the event of a vehicle collision has been proposed (for example, Patent Document 1). In a three-point seat belt system, a lap belt (lap webbing) extends across the waist of an occupant seated in the seat and a lap webbing extends across the chest of the occupant when the tongue is properly connected to the buckle. The occupant is protected by a belt (hereinafter simply referred to as webbing) having a shoulder belt (shoulder webbing).

Patent No. 6027249

In such a conventional seatbelt device, when a vehicle crashes, the webbing may shift in the width direction and the side edge of the webbing may get caught in the gap between the members forming the tongue.
If such entanglement occurs, the thread forming the side edge of the webbing is partially cut and frayed. Therefore, there is room for further improvement.
SUMMARY OF THE INVENTION An object of the present invention is to provide a seat belt device that can protect webbing by suppressing the occurrence of fraying.

A seat belt device of the present invention is a seat belt device in which a tongue inserted in the middle of a webbing is inserted into a buckle and fixed. The tongue includes a tongue body formed with an insertion hole through which the webbing is inserted, and an insert plate embedded in the tongue body so that one end side is inserted into the buckle and the other end side is exposed through the insertion hole. Further, the tongue is disposed in the tongue body facing the other end side of the insert plate, and is slidably contacted so that the webbing is folded back, and the webbing is on the opposite side of the rod member to the webbing and is folded back. and a cam member arranged between them so as to be able to swing in a direction of approaching and separating from the other end side of the insert plate. The cam member includes a sandwiching portion sandwiching one side of the webbing folded back by the rod member and the insert plate, and a cam member slidingly contacting the other side of the webbing folded back by the rod member to press the sandwiching portion toward the insert plate. and a pair of projecting portions projecting from both ends of the cam member, and a sandwiching portion is provided between the pair of projecting portions . Both ends of the pressing portion in the width direction of the webbing are formed with curved surfaces that move away from the webbing that is in sliding contact with the pressing portion toward the outer side in the width direction.

ADVANTAGE OF THE INVENTION According to this invention, the seatbelt apparatus which can suppress generation|occurrence|production of fraying and can protect a webbing can be provided.

1 is a perspective view for explaining the configuration of the entire seat belt in the seat belt device of Embodiment 1 of the present invention. FIG. 1 is a perspective view showing the external shape of a tongue in the seat belt device of Embodiment 1. FIG. 1 is an exploded perspective view showing the construction of a tongue in the seat belt device of Embodiment 1. FIG. 2 is a plan view showing the configuration of the rear surface of the tongue in the seat belt device of Embodiment 1. FIG. FIG. 5 is a plan view of the principal part of the seat belt device of Embodiment 1, viewed from the direction of arrow V in FIG. 4; FIG. 5 is a bottom view of the essential parts of the seat belt device of Embodiment 1, viewed obliquely downward in the direction of arrow VI in FIG. 4; FIG. 3 is a cross-sectional view of the seat belt device of Embodiment 1 at a position along line VII-VII in FIG. 2; 8 is a cross-sectional view of the seat belt device of Embodiment 1 at a position corresponding to FIG. 7, showing a locked state in which the cam member slides against the webbing and presses it toward the insert plate. FIG. FIG. 6 is a plan view of the main part of the seat belt device of Embodiment 2, corresponding to FIG. 5 ;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with appropriate reference to the drawings. The same reference numerals are given to the same components, and overlapping descriptions are omitted. The same reference numerals are given to the same components, and overlapping descriptions are omitted. Unless otherwise specified, directions are basically explained based on front and rear, left and right, or up and down as seen from the driver. Further, the "vehicle width direction" is synonymous with the "left-right direction".

[Embodiment 1]
The configuration of the seat belt device 2 of Embodiment 1 will be described.
As shown in FIG. 1, each seat provided in the passenger compartment of a vehicle 1 is provided with a seat belt device 2 for restraining an occupant seated on the seat.
The seatbelt device 2 has a webbing 3, a tongue 4 through which the webbing 3 is inserted, and a buckle 5 into which the tongue 4 is inserted and connected to connect the webbing 3 to engage in a restrained state.
In addition, the seatbelt device 2 includes a retractor 6 with a load limiter that winds and stores the webbing 3 from one end side, a wrap pretensioner 7 that connects the other end side of the webbing 3, and a webbing at the top of a fixed pillar or the like. It has a shoulder adjuster 9 for adjusting the vertical position of the D ring 8 folding back 3.

The webbing 3 is formed into a belt shape having a constant width dimension by weaving a plurality of threads. The webbing 3 has a predetermined thickness dimension and is configured to be bendable and to obtain a desired tensile strength. The webbing 3 is inserted so that an intermediate portion between the wrap pretensioner 7 and the shoulder adjuster 9 is slidable in the insertion hole 11 of the tongue 4 .
For this reason, the webbing 3 drawn out from the retractor 6 with a load limiter and shown in phantom lines is folded back at the tongue 4 and extends almost horizontally parallel to the upper surface of the seat cushion, and diagonally across the seat back. a shoulder portion extending from the
When the tongue 4 is connected to the buckle 5, the buckle 5 is connected to the retractor 6 with a load limiter, the shoulder adjuster 9, and the webbing 3 to restrain the waist and chest of an occupant seated on the seat.

As shown in FIG. 2, the tongue 4 includes a tongue body 10 and an insert plate 12 inserted into the buckle 5. As shown in FIG.
The tongue body 10 is mainly made of resin molding, and has a laterally long insertion hole 11 extending in the width direction W through which the webbing 3 is inserted.

Also, the insert plate 12 shown in FIG. 3 is made of a metallic material. The insert plate 12 has one end side 12a exposed to the outside of the tongue body 10, the other end side 12b, and an upper side portion 12c.
The one end side 12a is formed with a substantially rectangular protruding piece to be inserted into the buckle 5. As shown in FIG. A substantially rectangular lock opening is formed on the one end side 12a. The lock opening is formed with a pair of projections to be locked projecting substantially in the center thereof so as to be engaged with the locking claw portion provided on the buckle 5 side.

Further, the insert plate 12 is formed with the other end 12b disposed inside the tongue body 10 and a substantially gate-shaped upper side 12c on the opposite side of the one end 12a across the lock opening.
The upper side portion 12c of the insert plate 12 is formed in a substantially annular shape together with the other end side 12b and a pair of connecting frame portions extending from the left and right ends of the other end side 12b. Furthermore, a horizontally long slit portion 12d is formed between the side edge of the other end side 12b and the upper side portion 12c. The slit portion 12d is formed so as to match the position of the insertion hole 11 formed in the tongue body 10 (see FIG. 7).

As a result, the webbing 3 inserted into the insertion hole 11 of the tongue body 10 from one side opening passes through the slit portion 12d of the insert plate 12 and is led out from the other side opening of the insertion hole 11 again.
The other end 12 b of the insert plate 12 is embedded in the tongue body 10 so that the side surface on the webbing 3 side is partially exposed in the insertion hole 11 .

Further, as shown in FIG. 8, a rod member 13, a cam member 14, and a spring member 15 that biases the cam member 14 are provided inside the tongue body 10 (see FIG. 3).
The rod member 13 is arranged inside the tongue body 10 so as to face the other end side 12 b of the insert plate 12 . The rod member 13 is in the shape of a metal round bar. Moreover, the rod member 13 is set so that the dimension in the width direction W is larger than that of the cam member 14 .
As shown in FIG. 6, the rod member 13 has left and right ends embedded in the inner wall 10a of the tongue body 10 and fixed to the tongue body 10 . The rod member 13 is configured such that the webbing 3 is brought into sliding contact with exposed intermediate portions of the left and right end portions and folded back (see FIG. 8).

The cam member 14 is located on the opposite side of the webbing 3 which is in sliding contact with the rod member 13 and between the folded webbings 3 , 3 , so as to approach and separate from the other end side 12 b of the insert plate 12 . It is arranged so that it can swing in the direction.
As shown in FIG. 4, the cam member 14 of Embodiment 1 is formed in a substantially U-shape in plan view, and includes a plate-like cam main body portion 14b arranged parallel to the rod member 13 and a cam main body portion 14b. and a pair of protruding portions 14a protruding from both ends thereof.
As shown in FIG. 8, the cam body 14b has a recessed sliding surface 14c that is recessed on the rod member 13 side. An edge portion of the cam body portion 14b on the side of the insertion hole 11 (one end side) constitutes a sandwiching portion 14d that sandwiches the one side 3a of the webbing 3 folded back by the rod member 13 and the other end side 12b of the insert plate 12. is doing. In the cam member 14 of Embodiment 1, a sandwiching portion 14d is arranged between a pair of projecting portions 14a (see FIG. 3).
The edge of the cam main body 14b on the opposite side (other end side) of the insertion hole 11 is in sliding contact with the other side 3b of the webbing folded back by the rod member 13, and extends toward the other end 12b of the insert plate 12. A pressing portion 14e is configured to press the holding portion 14d.
One side 3a of the webbing 3 is connected to the wrap pretensioner 7, and the other side 3b of the webbing is connected to the shoulder adjuster 9 (see FIG. 1).
The pair of protruding portions 14a are in sliding contact with both edge portions of the webbing 3 to prevent the webbing 3 from being displaced. The cam member 14 swings while bringing the sliding surfaces 14 c into sliding contact with the outer peripheral surface of the rod member 13 .
When the pressing portion 14 e is pressed by the other side 3 b of the webbing 3 , the cam member 14 moves toward the other end side 12 b of the insert plate 12 . The sandwiching portion 14 d sandwiches the one side 3 a of the webbing 3 with the other end side 12 b of the insert plate 12 .

As shown in FIG. 8, when tension is applied to one side 3a and the other side 3b of the webbing 3, the webbing 3 folded back by the rod member 13 moves the one side 3a and the other side 3b in the approaching direction. The pressing portion 14e is pressed by the other side 3b.
Therefore, the cam member 14 swings, and the one side 3a of the webbing 3 is sandwiched between the sandwiching portion 14d and the other end side 12b, thereby stopping the webbing 3. As shown in FIG. The tongue 4 is thereby locked at the desired position of the webbing 3 .

Further, as shown in FIG. 3, the spring member 15 is a leaf spring member and is formed in a substantially gate shape in which a pair of leg portions protrude from both left and right ends of a flat plate-like embedded piece portion.
As shown in FIG. 8, the spring member 15 has an embedded piece embedded in the tongue body 10 . The spring member 15 biases the cam member 14 toward the other side 3 b of the webbing 3 .
In a state where tension is not applied to the webbing 3, as shown in FIG. Create a gap that exceeds the directional dimension. Therefore, the webbing 3 is in an open state in which it can slide within the insertion hole 11 . Thereby, the tongue 4 can be slid to a desired position along the longitudinal direction of the webbing 3 .
Further, when no tension is applied to the webbing 3, the pressing portion 14e projects slightly from the side surface of the tongue body 10 due to the biasing force of the spring member 15 (see FIG. 7). When tension is applied to the webbing 3, the protruding pressing portion 14e is pushed by the webbing 3, and the cam member 14 moves toward the sandwiching portion 14d against the spring force. As a result, the pinching portion 14d is pressed against the webbing 3 (see FIG. 8).

As shown in FIG. 5, in the cam member 14 of the first embodiment, curved surfaces 16 are formed at both ends of the pressing portion 14e in the width direction of the webbing 3. As shown in FIG. FIG. 5 shows a curved surface 16 formed at one end. The cam member 14 of the first embodiment is provided with a pair of curved surfaces 16, 16 on both left and right corners of the pressing portion 14e of the cam member 14 so as to be left-right symmetrical.
The curved surface 16 smoothly connects the slidable contact surface 14f of the pressing portion 14e and the outer surface of the protruding portion 14a on the inner wall side of the tongue body, and is separated from the webbing 3, which is in sliding contact with the pressing portion 14e, toward the outer side in the width direction. formed.

As shown in FIG. 5, in the cam member 14 of the first embodiment, the position where the gap between the side edge of the cam member 14 and the inner wall 10a of the tongue body 10 narrows from the pressing portion 14e with which the webbing 3 is slidably contacted (pinch occurs). position) is set to be larger than the dimension d1 (d2>d1) when the corner 14k exists (see the two-dot chain line in the figure).
Therefore, even if the side edge of the webbing 3 is displaced in the width direction W, it is difficult for the webbing 3 to be pinched.

In the seatbelt device of Embodiment 1, as shown in FIG. 1, the tongue 4 inserted in the middle of the webbing 3 is inserted into the buckle 5 and fixed. The tongue 4 includes a tongue body 10 formed with an insertion hole 11 through which the webbing 3 is inserted, one end 12a of which is inserted into the buckle 5, and the other end 12b of which is exposed through the insertion hole 11 as shown in FIG. and an insert plate 12 embedded in the tongue body 10 .

As shown in FIG. 8, the tongue 4 is arranged inside the tongue main body 10 so as to face the other end 12b of the insert plate 12, and the rod member 13 with which the webbing 3 is slidably contacted so as to fold back. a cam member 14 arranged on the opposite side of the webbing 3 and between the folded webbings 3, 3 so as to be capable of swinging in a direction of approaching and separating from the other end side 12b of the insert plate 12; I have it.

The cam member 14 is in sliding contact with a sandwiching portion 14d that sandwiches the one side 3a of the webbing 3 folded back by the rod member 13 and the insert plate 12, and the other side 3b of the webbing 3 folded back by the rod member 13. and a pressing portion 14e that presses the sandwiching portion 14d toward the insert plate 12.
As shown in FIG. 5, curved surfaces 16 are formed at both ends of the pressing portion 14e in the width direction W of the webbing 3, and are inclined away from the webbing 3 that is in sliding contact with the pressing portion 14e toward the outside in the width direction. ing.

The seat belt device of Embodiment 1 configured in this manner can protect the webbing 3 by suppressing the occurrence of fraying.
Specifically, when the webbing 3 is not tensioned as shown in FIG. 7, the pressing portion 14e of the cam member 14 is in contact with the webbing 3 by the biasing force of the spring member 15 (see FIG. 8).
When the pressing portion 14e presses the webbing 3, the sandwiching portion 14d located on the opposite side of the cam member 14 is separated from the one end 12a on the insert plate side to form a gap. Therefore, the cam member 14 is in an open state, and the tongue body 10 can be moved by sliding the webbing 3 in the insertion hole 11 .

As shown in FIG. 5 , curved surfaces 16 are formed at corners of the cam member 14 located on both side edges of the sliding contact surface 14 f in the width direction of the webbing 3 .
For this reason, between the side surface of the cam member 14 and the inner wall 10a of the tongue body 10, a cavity having a substantially right-angled triangular shape in plan view is formed. As a result, a predetermined dimension d2 is provided from the side edge of the webbing 3 to the position of the gap where biting starts. Therefore, the webbing 3 can reduce the risk of the outer side edge in the width direction W being caught between the side edge of the cam member 14 and the inner wall 10 a of the tongue body 10 .
For example, even if the webbing 3 is displaced in the width direction W, the side edge of the webbing 3 does not get caught in the gap and stops in contact with the inner wall 10a. Therefore, the webbing 3 can be protected by suppressing the fraying caused by the side edges getting caught.

Further, as shown in FIG. 4, a pair of curved surfaces 16 are formed at both end portions of the pressing portion 14e of the cam member 14, respectively. For this reason, even if the webbing 3 is displaced in the width direction W either to the left or to the right, none of the side edges are caught in the gap between the inner wall 10a and the cam member 14 .
Moreover, in the first embodiment, even if the side edges of the webbing 3 are displaced in the width direction W, the inner wall 10a (FIG. 6) of the tongue body 10 is maintained while maintaining the curved shape folded back on the outer peripheral surface of the rod member 13. (see reference) and stop by abutting the side edge. For this reason, the side edges of the webbing 3 are less likely to bend in the direction of the gap, and the risk of the webbing 3 entering a position where it is caught is reduced.

As shown in FIG. 8 , by stretching the webbing 3 , the cam member 14 swings so that the pressing portion 14 e is pushed by the other side 3 b and approaches the other end side 12 b of the insert plate 12 .
The sandwiching portion 14d of the cam member 14 presses the one side 3a of the webbing 3 against the other end 12b to sandwich it between the sandwiching portion 14d and the other end 12b. Therefore, the webbing 3 is fixed in the insertion hole 11 and the tongue 4 is stopped at a desired intermediate position of the webbing 3 in a locked state.

As shown in FIG. 5, the seat belt device 2 of Embodiment 1 can easily prevent entrapment simply by changing the shape of the existing cam (see the corner 14k of the two-dot chain line in the figure) to form a curved surface 16. . Therefore, it is possible to take measures to protect the webbing 3 at low cost without requiring new parts.

[Embodiment 2]
FIG. 9 shows a seat belt device according to Embodiment 2 of the present invention. The same or equivalent parts as those of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
As shown in FIG. 9, the cam member 24 of the second embodiment has a substantially flat inclined surface 26 with an obliquely chamfered end. Here, for comparison, the outline of the corner 14k where the inclined surface 26 is not formed is indicated by a chain double-dashed line.
The dimension d2 from the pressing portion 14e with which the webbing 3 is in sliding contact to the position where the gap between the side edge of the cam member 14 and the inner wall 10a of the tongue body 10 is narrowed (the position where pinching occurs) is d1 (d2>d1).
Therefore, even if the side edge of the webbing 3 is displaced in the width direction W, it is difficult for the webbing 3 to be pinched.

In the second embodiment, in addition to the effects of the seat belt device 2 of the first embodiment, the angle α between the sliding surface 14c with which the webbing 3 slides and the inclined surface 26 in the pressing portion 14e exceeds 90 degrees. It is set to be an obtuse angle of about 135 degrees.
Therefore, the side edge of the webbing 3 can ensure a sufficient dimension d2 from the point where it abuts against the inner wall 10a of the tongue body 10 to the position of the gap where biting occurs.

The angle α between the sliding surface 14f with which the webbing 3 slides and the inclined surface 26 at both ends of the pressing portion 14e of the second embodiment is set to exceed 90 degrees. However, the angle α is not particularly limited to this, and may be set to approximately 95 degrees to 175 degrees, more preferably approximately 120 degrees to 150 degrees. That is, if the inclined surface 16 is inclined at an obtuse angle of more than 90 degrees from the sliding contact surface 14f so as to move away from the webbing 3 that is in sliding contact with the pressing portion 14e toward the outside in the width direction, what angle α is set? may
As described above, the second embodiment provides a seatbelt device that can protect the webbing 3 by preventing the webbing 3 from being caught even if the webbing 3 is displaced in the width direction W, thereby suppressing fraying.
Other configurations and effects are the same as those of the seatbelt device 2 of Embodiment 1, so description thereof will be omitted.

As described above, in the seat belt devices 2 of Embodiments 1 and 2, the curved surface 16 or the inclined surface 26 is formed at both ends of the cam members 14 and 24 so as to separate from the webbing 3 toward the outer side in the width direction W. .
Therefore, between the side surfaces of the cam members 14 and 24 and the inner wall 10a of the tongue body 10, a cavity having a substantially right-angled triangular shape in plan view is formed. Therefore, the webbing 3 moves away from the location where the webbing 3 is caught on the outside in the width direction, and is suppressed from being caught. As a result, fraying of the side edge is suppressed, and the webbing 3 can be protected.

The present invention is not limited to the embodiments described above, and various modifications are possible. The above-described embodiments are illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Also, it is possible to delete part of the configuration of each embodiment, or to add or replace other configurations. Possible modifications to the above embodiment are, for example, as follows.

That is, in the first embodiment, the curved surfaces 16 are formed at both ends of the pressing portion 14e in the width direction W of the webbing 3, and in the second embodiment, the substantially flat inclined surfaces 26 are formed. is not limited to
For example, the inclined surface 26 may be a combination of one or more inclined surfaces or steps. Further, the curved surface 16 may be curved concavely or convexly, or a connecting portion or a stepped portion may be formed to connect between a plurality of adjacent curved surfaces 16 or inclined surfaces 26 . Further, a plurality of curved surfaces 16 and inclined surfaces 26 may be three-dimensionally combined at different angles. That is, at both ends of the pressing portion 14e in the width direction W of the webbing 3, at least one curved surface 16 or an inclined surface 26 inclined away from the webbing 3 slidingly contacting the pressing portion 14e toward the outer side in the width direction W is formed. The shape, quantity and material of the end portion are not limited as long as they are included in the portion.

2 seat belt device 3 webbing 4 tongue 5 buckle 10 tongue body 11 insertion hole 12 insert plate 12a one end side 12b other end side 13 rod member 14 cam member 14d sandwiching portion 14e pressing portion 16 curved surface

Claims (3)

A seat belt device in which a tongue inserted in the middle of webbing is inserted into a buckle and fixed,
The tongue is
a tongue body having an insertion hole through which the webbing is inserted;
an insert plate embedded in the tongue body such that one end is inserted into the buckle and the other end is exposed through the insertion hole;
a rod member disposed inside the tongue body facing the other end side of the insert plate and slidably contacting the webbing so as to fold back;
a cam member disposed on the side opposite to the webbing with respect to the rod member and between the folded webbings so as to be swingable in a direction to approach and separate from the other end side of the insert plate; , and
The cam member is
a sandwiching portion sandwiching one side of the webbing folded back by the rod member and the insert plate;
a pressing portion that slidably contacts the other side of the webbing folded back by the rod member and presses the pinching portion toward the insert plate;
a pair of protrusions protruding from both ends of the cam member ,
The pinching portion is provided between the pair of projecting portions,
Both ends of the pressing portion in the width direction of the webbing are formed with curved surfaces that move away from the webbing that is in sliding contact with the pressing portion toward the outer side in the width direction.
A seat belt device characterized by: A seat belt device in which a tongue inserted in the middle of webbing is inserted into a buckle and fixed,
The tongue is
a tongue body having an insertion hole through which the webbing is inserted;
an insert plate embedded in the tongue body such that one end is inserted into the buckle and the other end is exposed through the insertion hole;
a rod member disposed inside the tongue body facing the other end side of the insert plate and slidably contacting the webbing so as to fold back;
a cam member disposed on the side opposite to the webbing with respect to the rod member and between the folded webbings so as to be swingable in a direction to approach and separate from the other end side of the insert plate; , and
The cam member is
a sandwiching portion sandwiching one side of the webbing folded back by the rod member and the insert plate;
a pressing portion that slidably contacts the other side of the webbing folded back by the rod member and presses the pinching portion toward the insert plate;
a pair of protrusions protruding from both ends of the cam member ,
The pinching portion is provided between the pair of projecting portions,
Both ends of the pressing portion in the width direction of the webbing are provided with inclined surfaces that are inclined away from the webbing that is in sliding contact with the pressing portion toward the outer side in the width direction.
A seat belt device characterized by: The angle formed between the sliding surface on which the webbing slides in the pressing portion and the inclined surface is an obtuse angle.
3. The seat belt device according to claim 2, characterized in that:

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