JPS6149132B2 - - 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. The present invention relates to a seat belt device that can be used as a seat belt device.

[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, the slider needs to be moved quickly and smoothly along the guide rail when the occupant gets on or off the vehicle, and it is also necessary 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 includes a slider and a guide rail that are small and have sufficient strength, and a seat belt that allows the slider to run stably and smoothly on the straight and curved portions of the guide rail. The purpose is to provide equipment.

[Means for Solving the Problems] In order to achieve the above object, the seat belt device of the present invention includes a slider having a head portion and a belt attachment portion, and a head slidably housing the head portion of the slider. The slider includes a guide rail having a groove, and a drive section for moving the slider along the guide rail, and the head section of the slider has a cross section along the direction of movement of the slider formed in a substantially arc shape. , both ends of the head portion are located on the side of the belt attachment portion of the slider and are in contact with the groove bottom of the head groove portion of the guide rail, and the guide rail has at least one bent portion. be.

[Effect]

When the seat belt is fastened or released, the drive section is activated and the head of the slider moves while being guided by the head groove of the guide rail. At this time, the head portion of the slider slides with both ends thereof in contact with the groove bottom of the head groove portion of the guide rail, so the sliding resistance is small and the slider travels while being supported by the two contact portions. This allows for stable and smooth running. In addition, when the slider passes through the bending part of the guide rail, since the head part and the bending part of the guide rail are formed with a predetermined radius of curvature, sliding resistance does not increase and the slider can run smoothly on the curve. I can do it.

〔Example〕

Embodiments of the 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 center 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 is movable 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 side of the body portion 16. The head portion 15 of the slider 9 has a radius of curvature R ₁ of the inner surface 15A on the body side.
Slider groove 1 in the curved part shown as 13A in the figure
The radius of curvature R 2 is set smaller than the radius of curvature R ₂ of the head groove 19 of No. 4, so that both ends of the head 15 in the running direction are in stable sliding contact with the head groove 19 in the entire area where the guide rail 13 is disposed.

A mounting seat 20 is provided on the lower end side of the body portion 16 of the slider 9.
are attached from the front and back, and fixed by a lippet 22.

This shoe 21 has extremely low frictional resistance.
It has good abrasion resistance, heat resistance, and cold resistance, and is molded from a synthetic resin such as nylon that has the same physical properties. Therefore, the slider 9, which is slidably guided in the slider groove 14 via the shoe 21, can run smoothly along the longitudinal direction of the guide rail 13.

In the body part 16 of the slider 9, a driving tape 24 is located between the head part 15 and the position where the shoe 21 is covered.
It is inserted into a mounting hole 25 that is opened at the end side. This drive tape 24 is perpendicular to both sides of the middle part of the body groove part 23 in the slider groove 14 of the guide rail 13, and
The tape is movably inserted through a tape groove 26 extending in the longitudinal direction of the tape. That is, the driving tape 24 is moved along the tape groove 26 to the guide rail 13.
By moving the slider 9 in the longitudinal direction,
The guide rail 13 can move from a vertical backward end side 13C along the center pillar 12 to an inclined forward end side 13B along the front pillar 10. Slider 9
The leg portion 17 of the body portion 16 is
It is bent at an angle θ as shown in
An anchor plate 8 is connected to its lower end side by bolts 27 and nuts 28. Since the leg portion 17 is bent in this way with respect to the body portion 16, the anchor plate 8
Webbing tension F acting on the end of the slider 9 through the arm length L relative to the corner of the head 15
1 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. 4B, and therefore the angle of the head portion 15 is The rotational force exerted by the webbing tension F on the guide rail 13 is reduced, and the effect of forcing the slider groove 14 of the guide rail 13 open 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. 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. Here, the body portion, leg portions, and anchor plate of the slider constitute a belt attachment portion.

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 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 to prevent 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. The head portion 1 of the slider 9 is arranged close to each other so that the distance E between the sliders 9 and 1 is small.
When the tip end side of the head part 5 is locked and held by the anchor pin 35, the effect W exerted on the head groove part 19 of the guide rail 13 by the other end side of the head part 15 can be reduced.

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 attachator 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 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 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.
3C and the forward end side 13B.

The motor 48 is activated by detecting the passenger's getting on and off. For example, when the passenger closes the door after seating, the sprocket wheel 44 is rotated clockwise in FIG. Slider 9
is moved toward the rearward end side 13C of the guide rail 13, and at the rearward end, the aforementioned stop switch 3 is activated.
When the passenger opens the door, the sprocket wheel 44 is rotated in the opposite direction to move the slider 9 to the guide rail 1.
3 toward the forward end side 13B.

Next, the operation of the above embodiment will be explained. When a passenger gets on board and closes the door after seating, the drive tape 24 is driven by the motor 48 to move the slider 9 and anchor plate 8 toward the rearward end side 13C of the guide rail 13.
The occupant is placed in a state where the webbing 1 is attached as shown in FIG. Here, the driving tape 24 that transmits the driving force of the slider 9 is attached to the slider at an intermediate portion between the head part that slides in the slider groove 14 of the guide rail 13 and the attachment position of the anchor plate 8 to which the webbing 1 is connected. 9 body part 16
, the driving force of the driving tape 24 is stably transmitted to the slider 9, and the slider 9 can move smoothly within the guide rail 13. The drive tape 24 is connected to the head portion 15.
The drive tape 24 is engaged with the body part 16 approximately in the middle of the leg part 17, and therefore the driving force by the drive tape 24 acts on the approximately middle part of the entire slider, so that the force acting on the entire slider becomes uneven. As a result, the head portion 15 is less likely to become jammed within the head groove portion 19.

Further, the head portion of the slider 9 is in a state of protruding on both sides with respect to the body portion 16, and the guide rail 13 is
Since the slider 9 is slidably supported in the head groove 19, the slider 9 is stably supported in the cross-sectional width direction of the guide rail 13, and can be smoothly moved.
Also, the radius of curvature of the inner surface of the head on the side where the belt is attached
Since R ₁ 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 is also supported at two points at both ends in the running direction, and therefore the slider 9 is supported at two points at both ends in the running direction. It is always possible to move smoothly in a stable state even in the direction of travel.

Furthermore, since the damper rubber 40 is disposed at the end of the retreating end side 13C of the guide rail 13, when the slider 9 reaches its retreating end side,
The movement inertia is absorbed by the damper rubber 40, and the slider 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 13C of the guide rail 13, movement in both the front and back directions of the chamber 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 13C of the guide rail 13, so that movement in the longitudinal direction of the vehicle is prevented. There is.

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.

〔Effect of the invention〕

As described above, according to the present invention, since the head portion of the slider is formed in a substantially arc shape, the contact portion with the head groove portion of the guide rail is small, and since the slider is supported at two points, the movement of the slider is facilitated. This can be done stably and smoothly, and since the sliding resistance is reduced, the driving force can be reduced.
In addition, since the radius of curvature of the bent part of the guide rail is set larger than the radius of curvature of the head part of the slider, the head part moves smoothly at the bent part, and the height of the head groove of the guide rail can be lowered. Since it is possible to do this, the guide rail can be made smaller.

[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 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. 6 is a sectional view taken along line - in FIG. 5; FIG. 7 is an exploded perspective view showing the combination of the drive tape and the sprocket foil; 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, 13C...Retreat end side guide rail, 14...Slider groove, 15...Head part, 15A...Inner sliding surface, 16...Body part, 1
7... Leg part, 21... Shoe, 23... Body groove part, 2
4... Drive tape, 26... Tape groove, 29... Projection, 30... Recess, 32... Mounting groove, 35... Anchor pin.

Claims (1)

[Claims] 1. A slider having a head portion and a belt attachment portion, a guide rail having a head groove portion for slidably housing the head portion of the slider, and a drive portion for moving the slider along the guide rail. In the seat belt device, the head portion of the slider has a substantially arc-shaped cross section along the direction of movement of the slider, and both ends of the head portion are located on the side of the belt attachment portion of the slider, and are located in the head groove portion of the guide rail. A seat belt device, wherein the guide rails each have at least one bent portion, each of which is in contact with a groove bottom.