JPS6149133B2 - - 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 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 attachment rate of restraint webbing is extremely low because it is complicated to attach.

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 moved toward and away from the seated occupant, and the attachment section is automatically released. 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 ensure that the occupant is restrained 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.

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

[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 unit for moving the slider along the guide rail, and at least a contact portion of the head of the slider with the head groove of the guide rail as a sliding part shoe. It is characterized by being coated with a twist.

[Effect]

According to the above configuration, when the seat belt is fastened or released, the drive section is activated and the head section of the slider moves while being guided by the head groove section of the guide rail. At this time, since the head portion of the slider is covered with the shoe for the sliding portion, the sliding resistance against the head groove portion is reduced, and smooth running is achieved.

〔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 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 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, and the first shoes 18 slide into the head groove 19 forming the innermost part of the slider groove 14 of the guide rail 13. It is housed in a movable manner. The radius of curvature R ₁ of the inner sliding surface 18A of the first shoe 18 is the radius of curvature of the slider groove 14 of the curved portion of the guide rail 13 shown by 13A in FIG.
The radius of curvature _R2 of the head groove 19 is set to be smaller than the radius of curvature R2 of the head groove 19, and both ends of the inner sliding surface 18A of the first shoe 18 in the running direction can stably slide into contact with the head groove 19 in the entire installation area of the guide rail 13. It's becoming like that.

A mounting seat 20 is provided at the lower end 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.
It is designed to be slidably guided near the opening 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 driving tape 24 is attached to a body groove portion 23 in the slider groove 14 of the guide rail 13.
A tape groove 26 extends in the longitudinal direction of the guide rail 13 and is perpendicular to both sides of the intermediate portion of the guide rail 13.
It is inserted so that it can move inside. 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 from the vertical rearward end side 13C along the center pillar 12 of the guide rail 13 to the front pillar 10. It is now possible to move to the forward end side 13B which is inclined along the forward direction. The leg portion 17 of the slider 9 is bent at an angle θ 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 L ₁ is smaller than the arm length L ₂ when the leg 17 is straight with respect to the body 16 as shown by the two-dot chain line in FIG. 4B, and therefore the head The rotational force exerted by the webbing tension F on the corner of the portion 15 is reduced, and the effect of prying 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 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 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 sensor pillar inner or 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 34 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 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 rearward 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 3.
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 door is opened, the occupant rotates the sprocket wheel 44 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 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.

The first shoe 18 attached to the head portion 15 of the slider 9 is in a state of protruding from both sides with respect to the body portion 16, and is attached to the head groove portion 19 of the guide rail 13.
Since the slider 9 is slidably supported by the guide rail 13, the slider 9 is stably supported in the cross-sectional width direction of the guide rail 13, and can be smoothly moved. Further, the radius of curvature R ₁ of the inner sliding surface 18A of the first shoe 18 is equal to the radius of curvature R1 of the slider groove 1
Since the radius of curvature R ₂ is set to be smaller than the curved portion 13A, the slider 9 is supported at two points at both ends in the running direction, so that the slider 9 can always move smoothly in a stable state in the running direction. Become. Further, the slider 9 is connected to the slider groove 1 of the guide rail 13 via a first shoe 18 and a second shoe 21 made of a material with extremely low frictional resistance.
4 slides, the frictional resistance during movement is reduced and smooth movement is possible.

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 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 in the vertically receding end side 13C of the guide rail 13, so that movement of the vehicle in the longitudinal direction is prevented. .

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 covered with the sliding shoe, the frictional resistance with the head groove portion of the guide rail is reduced, smooth running is guaranteed, and the slider is Since the movement is light, the driving force is reduced, and the power consumption of the drive unit can be reduced. Also,
Since the sliding member is interposed between the head portion and the head groove portion, the sliding noise can be reduced and quiet running can be achieved. Furthermore, compared to a guide rail with a member with low frictional resistance attached to the head groove,
In the present invention, since the head portion is covered with a sliding shoe, manufacturing is easy and material costs can be reduced.

[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, 14... Slider groove, 15... Head portion, 18... First shoe, 18A
...Inner sliding surface, 19...Head groove, 21...Second shoe, 24...Drive tape, 26...Tape groove.

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 moving the slider along the guide rail. What is claimed is: 1. A seat belt device comprising: a drive portion; wherein at least a portion of the head portion of the slider that contacts the head groove portion of the guide rail is covered with a sliding portion shoe. 2. The seat belt device according to claim 1, wherein the shoe for the sliding portion is formed in sections.