JPS6146356B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a seat belt device that restrains and protects an occupant in the event of a vehicle emergency such as a collision, and particularly relates to a seat belt device that automatically attaches restraint webbing to the occupant after the occupant is seated. The present invention relates to a seat belt device that can

[Conventional technology]

The seat belt device protects the occupant by restraining the occupant with the webbing in the event of a vehicle emergency, so the occupant is safely protected from colliding with the steering wheel or the like.

However, in general, the rate of attachment of restraining webbings is extremely low due to the fact that it is complicated to attach them.

Conventionally, seatbelt devices have been proposed that are capable of automatically attaching restraining webbing to the body of an occupant after the occupant is seated. This seatbelt device installs a guide rail on the vehicle body, and by running a slider to which the end of the webbing is attached along the guide rail, the webbing is automatically attached and released by moving the webbing toward and away from the seated occupant. is possible.

[Problem that the invention seeks to solve]

In such a seat belt device, it is necessary for the slider to move quickly and smoothly along the guide rail when the occupant gets on or off the vehicle, and in case of a vehicle emergency,
It is necessary that the slider and guide rail have sufficient strength to reliably restrain and protect the occupant. Further, the slider and the guide rail are arranged inside the vehicle interior, and it is desirable that their volume be as small as possible and that they do not protrude into the vehicle interior.

The present invention was made in view of the above facts, and an object of the present invention is to provide a seat belt device that is small in size and includes a slider and a guide rail that ensure sufficient strength, and that allows the slider to run smoothly. do.

[Means for solving problems]

In order to achieve the above object, in the seat belt device of the present invention, one end of the occupant restraint webbing is connected to a slider, and the slider is moved along a guide rail laid on the vehicle body, so that the webbing is attached to the occupant. In a seat belt device that is brought into contact with and separated from the body of a person, the slider is provided between a head portion, a leg portion to which the webbing is attached, and a portion between the head portion and the leg portion, and is suspended from a central portion of the cross section of the head portion. and a body portion in which the drive tape is engaged, and the guide rail includes:
A substantially T-shaped slider groove consisting of a head groove that slides and guides the head of the slider and a body groove that slides and guides the body of the slider, and an approximately intermediate portion of the body groove of the slider groove; The tape groove is perpendicular to the tape groove for inserting and guiding the drive tape.

[Effect]

According to the above configuration, the movement of the drive tape is restricted only in the direction of movement of the slider, and the driving force is applied in a balanced manner to the middle part of the entire slider, so that the movement of the drive tape is restricted only in the direction of movement of the slider. The force that bends the slider in the direction, that is, the rotational moment that rotates in the head groove of the guide rail using the head of the slider as a fulcrum, is less likely to occur, and the slider is guided slidingly against the guide rail with small frictional resistance. The slider does not get caught on the rail and become slow or stop, ensuring stable and smooth running of the slider at all times, and reliably attaching and detaching the webbing.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a webbing 1 for restraining an occupant is obliquely wrapped around the body of an occupant 3 seated on an occupant seat 2, so that the occupant 3 is in a webbing-attached state. The inner end portion 4 of the webbing 1 is wound onto a winding device 6 attached to a floor member 5 of the vehicle. This winding device 6 is disposed approximately in the center of the vehicle, winds up the webbing 1 with a biasing force, and incorporates an inertia lock mechanism that abruptly stops unwinding the webbing 1 in the event of a vehicle emergency.

On the other hand, an outer end 7 of the webbing 1 is connected to a slider 9 via an anchor plate 8. The slider 9 is the front pillar 10 of the vehicle,
The guide rails 13 as shown in FIG. 2A (showing the center pillar part), FIG. 2B (showing the roof side part), and FIG. 3 are laid along the roof side 11 and the center pillar 12. It is inserted into the guide groove 14. This guide groove 14
extends along the longitudinal direction of the guide rail 13, and the slider 9 is movable along this guide groove 14.

As shown in FIGS. 4A and 4B, the slider 9 includes a head portion 15 and a body portion 16 that is vertically disposed in a substantially T-shape from the center of the cross section of the head portion 15. , and a leg portion 17 extending from the lower end of the body portion 16. The head portion 15 of the slider 9 is covered with a pair of first shoes 18 from both sides.
is slidably accommodated in a head groove 19 forming the innermost part of the guide groove 14 of the guide rail 13. Inner sliding surface 18A of this first shoe 18
The radius of curvature R1 of the first guide rail 13 is
The radius of curvature R2 of the head groove 19 of the guide groove 14 in the curved portion 13A shown in the figure is set smaller than the radius of curvature R2, and both ends of the inner sliding surface 18A of the first shoe 18 in the running direction are set in the entire area where the guide rail 13 is disposed. The head groove portion 19 is adapted to stably slide into contact with the head groove portion 19.

A mounting seat 20 is provided on the lower end side of the body portion 16 of the slider 9, and a second shoe 21 is attached to the mounting seat 20 from the front and back, and is fixed by a rivet 22. This second show 2
1 is adapted to be slidably guided in the guide groove 14 toward the opening side of a body groove 23 forming a substantially T-shape with the head groove 19 .

These first shoes 18 and second shoes 21
is molded from a synthetic resin such as nylon, which has extremely low frictional resistance, good abrasion resistance, and excellent heat and cold resistance, and whose physical properties do not change. Therefore,
The slider 9 is slidably guided in the guide groove 14 through the first shoe 18 and the second shoe 21.
can run smoothly along the longitudinal direction of the guide rail 13.

In the body portion 16 of the slider 9, a mounting hole portion 25 opened toward the end of the drive tape 24 is inserted into an intermediate portion between the head portion 15 and the position where the second shoe 21 is covered. This drive tape 24 is connected to the body groove 2 in the slider groove 14 of the guide rail 13.
The tape groove 2 is perpendicular to both sides of the middle part of the guide rail 13 and extends in the longitudinal direction of the guide rail 13.
6 and is movably inserted therein. That is, as the drive tape 24 moves in the longitudinal direction of the guide rail 13 along the tape groove 26, the slider 9 moves toward the center pillar 12 of the guide rail 13.
It is possible to move from a vertical backward end side 13A along the front pillar 10 to an inclined forward end side 13B along the front pillar 10. The leg portion 17 of the slider 9 has a fourth position with respect to the body portion 16.
As shown in FIG.
Anchor plates 8 are connected by.
Since the leg portion 17 is bent in this manner relative to the body portion 16, the webbing tension F acting on the end portion of the slider 9 via the anchor plate 8, and the force of the arm against the corner portion of the head portion 15 are reduced. The length L1 is smaller than the arm length L2 when the leg portion 17 is straight with respect to the body portion 16 as shown by the two-dot chain line in FIG. The rotational force exerted by the webbing tension F on the corner of the guide rail 13 is reduced, and the effect of trying to pry open the slider groove 14 of the guide rail 13 is reduced.

Further, although the bolts 27 and nuts 28 attach the anchor plate 8 to the slider 9 so as to be relatively rotatable, the protrusion 29 protruding from the edge of the slider 9 is not provided on the anchor plate 8. The relative position of the anchor plate 8 with respect to the slider 9 under normal use is fixed, and the webbing 1 is engaged with the recess 30 in a direction that does not cause discomfort to the occupant 3.
is directing. Note that when the webbing tension F is applied during a vehicle emergency, the protrusion 29 is destroyed and the anchor plate 8 rotates around the bolt 27 to the position shown by the two-dot chain line in FIG. 3's body is now securely restrained. In the figure, 31 indicates a cover.

Attachment grooves 32 are formed continuously or intermittently in the longitudinal direction on both the outer side portions of the guide rail 13 on the vehicle interior side and the vehicle body side. A pair of lips 33 to cover the opening side and improve the aesthetic appearance.
It is designed to store and hold the proximal end of the Since this pair of lips 33 always seals the slider groove 14 where the slider 9 is not parked, it not only improves the aesthetic appearance but also directly transmits the sliding sound of the slider 9 inside the guide rail 13 into the vehicle interior. First, it is possible to prevent rainwater from entering the guide rail 13, and also to prevent the rail components from deteriorating due to sunlight. The guide rail 13 and the lip 33 on the inside of the vehicle are covered by a side garnish 34, and the lip 33 on the vehicle body side is held between the center pillar inner or the roof side inner and the side surface of the guide rail 13. There is. The mounting groove 32 can accommodate not only the lip 33 but also a guide rail covering member such as a side garnish 34.

As shown in FIGS. 5 and 6, an anchor pin 35 that can be engaged with the tip end side of the head portion 15 of the slider 9 is fixed to the end of the retreating end side 13A of the guide rail 13 by a washer 36. ing. The anchor pin 35 is disposed so as to pass through the body groove 23 between the head groove 19 and the tape groove 26 of the guide rail 13, and improves the strength of the guide rail 13 against the action of the webbing tension F in the event of a vehicle emergency. At the same time, the tip end of the head portion 15 of the slider 9 can finally be locked and held. In addition, with respect to the installation position of the anchor pin 35, the installation position of the bolt 27 for attaching the anchor plate 8 to the slider 9 is such that the line of action of the webbing tension F passing through the central axis of the bolt 27 is the central axis of the anchor pin 35. When the distal end side of the head section 15 of the slider 9 is locked and held by the anchor pin 35, the other end side of the head section 15 acts on the head groove section 19 of the guide rail 13. This makes it possible to reduce W.

Also, the rearward end side 13A of this guide rail 13
A stop switch 38 is disposed at the end of the guide rail 13 via a mounting bracket 37, and an actuator 39 of the stop switch 38 is connected to the head groove 1 of the guide rail 13.
A damper rubber 40 is provided on the opening side of the head groove 19. That is, when the slider 9 reaches the retreating end side 13A of the guide rail 13, the tip of the first shoe 18, which is covered with the head portion 15, touches the actuator 39.
is pushed in to stop the movement of the drive tape 24, and the movement inertia is absorbed by the damper rubber 40, so that the drive tape 24 is stopped in a quiet state near the anchor pin 35.

Further, a tape guide 41 as shown in FIG. 7 is connected to and arranged on the rearward end side 13A of the guide rail 13, and a tape track 42 is connected to the tape groove 26 of the guide rail 13 inside the tape guide 41. It is formed. The lower end of this tape guide 41 communicates with a sprocket housing 43 attached to the lower part of the center pillar 12.
A rectangular opening 45 of the drive tape 24 is adapted to engage with a sprocket wheel 44 which is pivotally supported within the sprocket housing 43.

A tape guide 46 is further connected to the sprocket housing 43, through which the drive tape 24 is pushed out after being engaged with the sprocket wheel 44. A sprocket wheel 44 in the sprocket housing 43 is rotated by an output shaft of a motor 48 passing through a cap 47, and the rotation of the sprocket wheel 44 causes the drive tape 24 to be moved along the guide rail. 13, move the slider 9 along the tape guides 41 and 46 to the rear end side 1 of the guide rail 13 as described above.
3A and the forward end side 13B.

The motor 48 is activated by detecting whether the passenger is getting on or off the vehicle. For example, when the passenger closes the door after sitting down, the sprocket wheel 44 is rotated clockwise in FIG. Then, the slider 9 is moved in the direction of the rearward end side 13A of the guide rail 13, and is stopped at the rearward end by the operation of the stop switch 38, and when the occupant opens the door, the slider 9 is moved in the opposite direction. By rotating the sprocket wheel 44, the slider 9 is moved toward the forward end side 13B of the guide rail 13.

Next, the operation of the above embodiment will be explained. When a passenger enters the vehicle and closes the door after seating,
By driving the motor 48, the drive tape 24
In order to move the slider 9 and the anchor plate 8 toward the rearward end side 13A of the guide rail 13, the occupant moves the webbing 1 as shown in FIG.
It is said that it is installed. Here, the driving tape 24 that transmits the driving force to the slider 9 is connected to the guide rail 1.
3, and the anchor plate 8 to which the webbing 1 is connected is located in the body part 16 of the slider 9. The driving force of the driving tape 24 is stably transmitted to the slider 9, and the slider 9 is connected to the guide rail 13.
You can move smoothly inside. More specifically, since the webbing 1 is attached to the leg portion 17 of the slider 9, it is thought that a resisting force acts on the leg portion 17 when the slider moves, and the head portion 15 on the opposite side of the leg portion 17 acts on the leg portion 17. It is thought that a similar resisting force acts on the slider when it moves. Here, the driving tape 24 is attached to the head portion 1.
5 and the leg portion 17, and therefore the driving force by the drive tape 24 acts on the approximately middle portion of the entire slider, so that the force acting on the entire slider is biased. This reduces the possibility of the head section 15 becoming jammed within the head groove section 19. Further, since the first shoe 18 attached to the head portion 15 of the slider 9 is slidably supported in the head groove portion 19 of the guide rail 13 while protruding from both sides with respect to the body portion 16, The slider 9 is stably supported in the cross-sectional width direction of the guide rail 13 and can move smoothly. Furthermore, since the radius of curvature R1 of the inner sliding surface 18A of the first shoe 18 is set smaller than the radius of curvature R2 of the slider groove 14 in the curved portion of the guide rail 13, even in the curved portion, both ends in the running direction are The slider 9 is supported at two points, so that the slider 9 can always move smoothly in a stable state even in its running direction. Furthermore, slider 9
slides on the slider groove 14 of the guide rail 13 via the first shoe 18 and second shoe 21 made of materials with extremely low frictional resistance, so the frictional resistance during movement is reduced and smooth movement is possible. becomes.

Furthermore, since the damper rubber 40 is disposed at the end of the guide rail 13 on the retreating end side 13A, when the slider 9 reaches its retreating end side,
The movement inertia is absorbed by the damper rubber 40, and the slider 9 can be stopped quietly.

When the occupant changes his or her driving posture with the webbing 1 attached in this manner, the inner end 4 of the webbing 1 can be moved by moving the occupant's upper body.
can be unwound from the winding device 6 against the winding force, and in this case, the anchor plate 8
Since the slider 9 is inserted into the vertical rearward end side 13A of the guide rail 13, movement in the longitudinal direction of the vehicle is prevented. In addition, in such an attached state, the attachment direction of the anchor plate 8 to the slider 9 is restricted to a predetermined direction by the uneven engagement between the protrusion 29 of the slider 9 and the recess 30 of the anchor plate 8. Even when the webbing 1 is attached, the occupant does not feel discomfort.

Next, when the vehicle is in an emergency situation such as a collision, the inertia lock mechanism in the winding device 6 suddenly stops unwinding the webbing 1, so that the occupant can be securely restrained by the webbing 1. can become. That is, the outer end 7 of the webbing 1 is engaged with the anchor plate 8, and the anchor plate 8 is housed on the vertically receding end side 13A of the guide rail 13, so that movement in the longitudinal direction of the vehicle is prevented. This prevents the occupants from being thrown forward of the vehicle and avoids collisions with dangerous objects. Here, since a large webbing tension F acts on the anchor plate 8, the protrusion 29 of the slider 9 is destroyed and disengaged from the recess 30, and the anchor plate 8 rotates relative to the slider 9, allowing the passenger to The webbing 1 is moved in a direction in which the webbing 1 can be surely restrained. In addition, since the anchor pin 35 is arranged on the retreating end side 13A of the guide rail 13, the strength of the guide rail 13 is improved, and the guide rail 13 will not open even with a large webbing tension F, and the slider 9
is securely held on the guide rail 13. Also,
As mentioned above, the attachment position of the anchor plate 8 to the slider 9 is such that the line of action of the webbing tension F approaches the installation position of the anchor pin 35.
The load exerted on the slider groove 14 by the opposite side of the tip that engages with the slider 9 is reduced, and since the leg portions 17 of the slider 9 are bent into the body portion 16, the width of the cross section of the slider groove 14 is reduced. The rotational force exerted by the head portion 15 of the slider 9 in this direction is reduced, and therefore, even if the shape of the guide rail 13 is made smaller, its strength can be ensured.

When the vehicle finishes its normal running state and the occupant exits the vehicle, the motor 48 is driven by opening the door, and the slider 9 is activated by moving the drive tape 24.
is moved toward the forward end side 13B of the guide rail 13, and the webbing 1 is stopped in the state shown by the two-dot chain line in FIG. 1, so that the occupant can easily get off the vehicle.
In this case as well, the slider 9 moves toward the guide rail 1 as in the case where the rider gets on the vehicle and the slider 9 is moved to the rearward end side 13A of the guide rail 13.
It is possible to move smoothly along 3.

In addition, in the above embodiment, the drive tape 24
was directly inserted into the body part 16 between the head part 15 and the second shoe 21, but as shown in FIG.
1C, and the drive tape 24 is inserted into the stepped portion 21C between the head portion 15 and the sliding portion 21B of the second shoe 21, and the drive tape 24 is inserted into the second shoe made of nylon or the like. You may make it contact the step part 21C of 21A.

〔Effect of the invention〕

As described above, according to the seat belt device according to the present invention, sufficient strength can be ensured by the downsized slider and guide rail, and the slider 9 can run smoothly along the guide rail. It can be done. In particular, since the slider is composed of a head section, a body section, and a leg section, and the drive tape is engaged with the body section, for example, a drive tape or wire can be connected to the section corresponding to the head section of the slider. Compared to the slider, the occurrence of bias in the force acting on the entire slider is reduced, and the head portion is less likely to get stuck in the head groove, thereby allowing the slider to run smoothly along the guide rail. It has the excellent effect of being able to

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the seat belt device according to the present invention, FIG. 2A is an enlarged sectional view of the center pillar portion, and FIG. 2B is an enlarged view of the roof side portion. 3 is an exploded perspective view of the main parts of FIG. 2, FIG. 4A is a front view of the slider, FIG. 4B is a side view of FIG. 4A,
Figure 5 is a side view showing the stopped state of the slider at the rearward end of the guide rail, and Figure 6 is the same as in Figure 5.
FIG. 7 is an exploded perspective view showing the combined relationship between the drive tape and the sprocket foil, and FIG. 8 is a side view showing another method of inserting the drive tape into the slider. 1...Webbing, 8...Anchor plate,
9...Slider, 13...Guide rail, 13A
...Retreat end side guide rail, 14...Slider groove, 15...Head part, 16...Body part, 17
...Legs, 18...First shoe, 18A...Inner sliding surface, 21...Second shoe, 23...Body groove, 24...Drive tape, 26...Tape groove, 2
9...Protrusion, 30...Recess, 32...Mounting groove, 35...Anchor pin.

Claims (1)

[Scope of Claims] 1. A seat belt device in which one end of the occupant restraint webbing is connected to a slider, and the slider is moved along a guide rail installed on the vehicle body to move the webbing toward and away from the occupant's body. In the slider, the slider includes a head portion, a leg portion to which the webbing is attached, and a body that is provided between the head portion and the leg portion, is suspended from the center of the cross section of the head portion, and is engaged with the drive tape. The guide rail includes a substantially T-shaped slider groove consisting of a head groove that slides and guides the head of the slider and a body groove that slides and guides the body of the slider, and a body of the slider groove. A seat belt device comprising: a tape groove for inserting and guiding a drive tape at a substantially intermediate portion of the groove and perpendicular to the body groove. 2. A patent in which the head portion of the slider is covered with a first shoe, the body portion is covered with a second shoe, and a drive tape is engaged at an intermediate portion between the head portion and the second shoe covered position. A seat belt device according to claim 1. 3. The seat belt device according to claim 1, wherein the first shoe sliding surface is a circular arc surface with a radius of curvature smaller than the radius of curvature of the curved portion of the guide rail. 4 The legs of the slider and the anchor plate are:
The seat belt device according to claim 1, wherein the seat belt device is mutually held at a predetermined relative position via a concave-convex engagement portion that can be disengaged by the action of webbing tension in a vehicle emergency. 5 On the slider retreating end side of the guide rail,
The seat belt device according to claim 1, further comprising an anchor pin that can be engaged with the head portion of the slider. 6. The seat belt according to claim 5, wherein the position where the anchor plate is attached to the leg of the slider is such that a line of action of the webbing tension passing through the anchor plate attachment position approaches the anchor pin placement position. Device. 7. The seat belt device according to claim 1, wherein the leg portion of the slider is bent with respect to the body portion of the slider. 8. The seat belt device according to claim 1, wherein a groove portion for holding a guide rail covering member is formed on an outer side portion of the guide rail.