JPS6149134B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] 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 be worn.

[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 seatbelt device, it is necessary to have a lever that allows the slider to move quickly and smoothly along the guide rail when the occupant gets on or off the vehicle, and also to securely restrain the occupant in the event of a vehicle emergency. It is necessary that the slider and guide rail have sufficient strength to protect them from damage. Further, the slider and the guide rail are arranged inside the vehicle interior, and it is desirable that their volume be made as small as possible.

This invention was made in view of the above facts, and it is possible to ensure sufficient strength with a small slider and guide rail, and the seat belt attached to the slider interferes with the vehicle body when the slider slides, so that the slider moves smoothly. An object of the present invention is to provide a seat belt device that does not impair smooth sliding motion.

[Means for solving problems]

To achieve the above object, the seat belt device of the present invention includes a slider having a head portion, a body portion, and a belt attachment portion, a head groove portion for slidably housing the head portion of the slider, and a guide for the body portion of the slider. The slider is provided with a guide rail having a body groove that allows movement along the rail, and a drive unit that moves the slider along the guide rail. The body part of the slider is suspended from approximately the center of the head part, and the belt attachment part is bent so as to be inclined toward the vehicle interior with respect to the body part. It is characterized by this.

[Effect]

According to the above configuration, when the seatbelt is attached or released, the drive section operates, and even if the webbing attached to the seatbelt attachment part of the slider is quite thick, it interferes with the vehicle body structure inside the vehicle interior. The slider moves smoothly along the guide rail. At this time, the tension of the seat belt is applied from the belt attachment section through the body section to the approximate center of the head section, so that the head section is maintained in even contact with the head groove section, and smooth running is achieved. . In addition, in the event of a vehicle emergency, the tension of the seat belt acts to rotate the slider in the width direction of the head groove using the head of the slider as a fulcrum, but since the belt attachment part of the slider is tilted inward into the vehicle interior. , the effective length (straight line distance) from the head section to the seat belt attachment section is shortened, and the rotational moment of the slider can be suppressed to a small level.

〔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 a 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 front pillar 12. It is inserted into the slider groove 14. This slider groove 14 extends along the longitudinal direction of the guide rail 13, and the slider 9 can move along this slider groove 14.

As shown in FIGS. 4A and 4B, the slider 9 includes a head portion 15, a body portion 16 extending vertically from the center of the cross section of the head portion 15 so as to form a substantially T-shape; The leg portion 17 extends from the lower end of the body portion 16 at an angle. The head portion 15 of the slider 9 is covered with a pair of first shoes 18 from both sides.
It is slidably housed in a head groove 19 that forms the most protruding part of the head. The radius of curvature R ₁ of the inner sliding surface 18A of the first shoe 18 is
The radius of curvature R ₂ of the head groove 19 of the slider groove 14 in the curved portion shown by 13A in FIG. Both ends in the running direction are in stable sliding contact with the head groove 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 the head groove portion 1 in the slider groove 14.
9 and is slidably guided to the opening side of a body groove 23 having a substantially T-shape.

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, which is slidably guided in the slider groove 14 via the first shoe 18 and the second shoe 21, can run smoothly along the longitudinal direction of the guide rail 13.

An intermediate portion of the body portion 16 of the slider 9 between the head portion 15 and the crowned position of the second shoe 21 is inserted into a drive hole portion 25 opened at the end side of the drive tape 24. 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 13C 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 Figure B, it is bent at an angle θ, and a bolt 27 and a nut 28 are attached to the lower end.
Anchor plates 8 are connected by.
Since the leg portion 17 is bent in this manner relative to the body portion 16, the seat belt attachment portion is positioned slightly on the inside of the vehicle interior, as shown in FIGS. 2A and 2B. Therefore, even when the webbing 1 attached to the anchor plate 8 is fixed to the leg part 17, the webbing 1 does not interfere with the body structure in the vehicle interior, and does not interfere with the smooth sliding of the slider 14. Furthermore, the webbing tension F acting on the end of the slider 9 via the anchor plate 8 and the length _L1 of the arm relative to the corner of the head 15 are determined by the length of the leg as shown by the two-dot chain line in FIG. 4B. 17 is made straight with respect to the body part 16, the arm length L2 is smaller than the length _L2 ,
Therefore, the rotational force exerted by the webbing tension F on the corner of the head portion 15 becomes smaller, and the guide rail 1
The effect of trying to pry open the slider groove 14 of No. 3 is reduced.

Further, although the bolts 27 and nuts 28 attach the anchor plate 8 to the slider 9 so as to be able to rotate relative to the slider 9, the protrusion 29 protruding from the edge of the slider 9 is provided on the anchor plate 8. engaged with the recessed portion 30;
The relative position of the anchor plate 8 with respect to the slider 9 under normal use conditions is fixed, and the webbing 1 is oriented in a direction that does not cause discomfort to the occupant 3. In addition, when the webbing tension F is applied in a vehicle emergency, the protrusion 29 becomes a broken line, 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. Here, the leg portion 17 of the slider and the anchor plate 8 constitute a belt attachment portion.

The guide rail 13 has mounting grooves 32 formed continuously or intermittently in the longitudinal direction on both the outer side parts of 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 appearance but also directly transmits the sliding sound of the slider 9 inside the guide rail 18 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 13C 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 13C 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 inserted into 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 13C 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.

Furthermore, a tape guide 41 as shown in FIG. 7 is connected and arranged on the rearward end side 13C of the guide rail 13, and a tape track 42 is connected therein to the tape groove 26 of the guide rail 13. 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 13, 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.
3C 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 seating, the sprocket wheel 44 is rotated clockwise as shown in FIG. , the slider 9 is moved toward the rearward end side 13C 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. The slider 9 is moved toward the forward end side 13B of the guide rail 13 by rotating the sprocket wheel 44.

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 anchor plate 8 toward the rearward end side 13C 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.
The driving force of the driving tape 24 is stable because it is disposed in the body part 16 of the slider 9 at an intermediate part between the head part that slides in the head groove part 19 of No. 3 and the belt attachment part to which the webbing 1 is connected. is transmitted to the slider 9, and the slider 9 can move smoothly within the guide rail 13.

Further, the head portion 15 of the slider 9 has a body portion suspended approximately in the center thereof, and both inner sides of the head portion sandwiching the body portion are slidably supported in the head groove portion 19 of the guide rail 13. As a result, 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 R ₁ of the inner sliding surface 18A of the first shoe 18 is set smaller than the radius of curvature R ₂ of the slider groove 14 of the curved portion 13A of the guide rail 13, the curved portion 13A also The slider 9 is supported at two points at both ends of the slider 9, so that the slider 9 can always move smoothly in a stable state even in its running direction.

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 13C of the guide rail 13, movement in the longitudinal direction of the vehicle is prevented.

Next, when the vehicle is in a tense state due to 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 in the vertically receding end side 13C of the guide rail 13, so that movement of the vehicle in the longitudinal direction is prevented. .

Here, since the leg portion 17 of the slider 9 as a belt attachment portion is bent to the body portion 16, the rotational force exerted by the head portion 15 of the slider 9 in the width direction of the cross section of the slider groove 14 is reduced. 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 is moved from the guide rail 1 to the rear end side 13C of the guide rail 13, as in the case where the rider gets on the vehicle and the slider 9 is moved to the rearward end side 13C 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 present invention, the belt attachment portion is inclined inward to the vehicle interior to form a gap between it and the inner surface of the vehicle body, so that when the slider moves, the seat belt does not come into contact with the vehicle body and impair the running of the slider. disappears. Furthermore, since the tension of the seat belt acts on the head groove of the guide rail through both sides of the head that sandwich the body, there is no biased force on the sliding part of the slider, and the slider is always stable and smooth. Running takes place.

Furthermore, even if a large tension is applied to the seatbelt,
Compared to a slider in which the belt attachment portion is straight, the present invention greatly reduces the effect of trying to pry open the slider groove of the guide rail.

[Brief explanation of the drawing]

FIG. 1 is a side view of 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 Figure 2, Figure 4A is a front view of the slider, Figure 4B is a side view of Figure 4A, and Figure 5 is a guide. FIG. 6 is a sectional view taken along line - in FIG. 5, and FIG. 7 is an exploded perspective view showing the combination of the drive tape and sprocket wheel. , 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, 14... Slider groove, 15... Head part, 16... Body part, 17... Leg part (belt attachment part), 19... Head groove part, 23...
Body groove portion, 24... Drive tape, 26... Tape groove.

Claims (1)

[Claims] 1. A slider having a head portion, a body portion, and a belt attachment portion, a head groove portion for slidably housing the head portion of the slider, and a body groove portion for allowing the body portion of the slider to move along a guide rail. In a seatbelt device comprising a guide rail and a drive section for moving the slider along the guide rail, the guide rail is laid on the vehicle body so that the body groove opens substantially downward into the vehicle interior, and the slider is moved along the guide rail. The body portion is suspended from approximately the center of the head portion, and
A seat belt device, wherein the belt attachment portion is bent so as to be inclined toward a vehicle interior with respect to the body portion.