JPS6146354B2 - - 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]

Since the seat belt device protects the occupant by restraining the occupant with the webbing in the event of a vehicle emergency, the occupant is safely protected from colliding with a 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 moved toward and away from the seated occupant and is automatically released. It is possible.

[Problem that the invention seeks to solve]

In such a seat belt device, the slider needs to move quickly and smoothly along the guide rail when the occupant gets on or off the vehicle, and when the webbing is attached, the slider needs to be stopped at a predetermined position. However, this stopping mechanism is generally configured to be activated by abutment of the slider. Therefore, when the slider stops, its inertial force causes a sound of contact with the stop mechanism, that is, a stop sound, which not only causes discomfort to the occupants, but also damages the slider drive unit or causes the stop mechanism to switch. There was a problem with it breaking.

The object of the present invention has been made in view of the above facts, and is to ensure sufficient strength of the slider and guide rail, to be able to stop the slider reliably at a predetermined position, and to absorb the inertia force at the time of stopping. To provide a seat belt device without stop sound.

[Means for solving problems]

The seat belt device of the present invention includes a guide rail that is laid on a vehicle body and has a guide groove, a sliding part that is slidably inserted into the guide groove of the guide rail, and a webbing to which one end of the webbing for occupant restraint is attached. A slider having a connecting portion, a slider driving portion that moves the slider as a passenger gets on and off, an actuator that is disposed near an end of the guide rail and is operated by a sliding portion of the slider, and a slider stopping mechanism comprising a stop switch that stops the slider drive section when the actuator is operated; and a buffer member that buffers the movement of the sliding section of the slider in the actuator operating direction when the actuator is operated by the sliding section of the slider. It is equipped with.

[Effect]

According to the above configuration, when the webbing is attached,
A slider is driven by a slider drive and moved to the end of the guide rail. Then, the sliding part of the slider stops the slider stopping mechanism, stops the slider driving part, and stops the movement of the slider. On the other hand, when the sliding part of the slider operates the slider stop mechanism, it comes into contact with the buffer member and absorbs the inertia of the slider, so the slider stops quietly without making a stop sound, and the webbing can be attached. Complete.

〔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, 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 header portion 15 of the slider 9 has a pair of first
A shoe 18 is crowned, and this first shoe 18 is
It forms the most protruding part of the guide groove 14 of the guide rail 13, and is slidably accommodated in the head groove 19. 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 head groove 19 of the guide groove 14 in the curved portion of the guide rail 13 shown by 13A in FIG. In the entire area where the guide rail 13 is installed, the first
Both ends of the inner sliding surface 18A of the shoe 18 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 mounted on 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. Here, the sliding parts of the slider are the head part 15, the mounting seat 20 of the body part 16,
It is composed of a first shoe 18 and a second shoe 21.

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. The drive tape 24 is movably inserted into a tape groove 26 extending in the longitudinal direction of the guide rail 13 and perpendicular to both sides of the middle part of the body groove 23 in the guide groove 14 of the guide rail 13. has been done. That is, the driving tape 24 is moved along the tape groove 26 to the guide rail 1.
By moving the slider 9 in the longitudinal direction of 3.
The guide rail 13 can move from a vertical backward end side 13A 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
The anchor plate 8 is bent at an angle as shown in FIG. Leg 1
7 is bent in this way with respect to the body portion 16, the webbing tension F acting on the end of the slider 9 via the anchor plate 8, and the length of the arm relative to the corner of the head portion 15. L1
is the leg 1 as shown by the two-dot chain line in Fig. 4B.
The arm length L2 is smaller than the length L2 when the arm 7 is straight with respect to the body part 16. Therefore, the rotational force exerted by the webbing tension F on the corner of the head part 15 becomes small, and the slider of the guide rail 13 The effect of trying to pry open the groove 14 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 in the recess 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 webbing connection part of the slider is connected to the leg part 1.
7 and an anchor plate 8.

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 E 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 as a buffer member. That is, when the slider 9 reaches the retreating end side 13C of the guide rail 13, the head portion 1
The tip of the first shoe 18, which is crowned by the anchor pin 3, presses the actuator 39 to stop the movement of the drive tape 24, and the damper rubber 40 absorbs the movement inertia, so that the anchor pin 3 stays in a quiet state.
It stops at a position near 5. Here, the slider stopping mechanism includes a mounting bracket 37 and a stop switch 3.
8, an actuator 39.

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. Slider 9 moves along tape guides 41 and 46
As mentioned above, the rearward end side 13 of the guide rail 13
C 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 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. Here, the slider driving section is composed of a driving tape 24, tape guides 41 and 46, a sprocket wheel 44, sprocket housings 43 and 47, and a motor 48.

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
The slider 9 and the anchor plate 8 are moved toward the rearward end side 13A of the guide rail 13. When the slider reaches the end of the guide rail 13, the actuator 3 is moved by the slider head 15.
9 is operated and the stop switch 38 is activated to stop the motor 48. At the same time, the head portion 15 of the slider contacts the damper rubber, its inertia is absorbed, and the slider stops quietly. The webbing 1 is attached so that the webbing 1 is attached. here,
Driving tape 24 that transmits driving force to slider 9
is arranged on the body portion 16 of the slider 9 at an intermediate portion between the attachment position of the first shoe 18 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. Therefore, the driving force of the driving tape 24 is stably transmitted to the slider 9, and the driving force of the driving tape 24 is stably transmitted to the slider 9.
can move smoothly within the guide rail 13. More specifically, since the webbing 1 is attached to the leg portion 17 of the slider 9, the leg portion 17
It is thought that a resisting force acts on the slider when it moves, and it is also thought that a similar resisting force acts on the head section 15 on the opposite side to the leg section 17 when the slider moves. Here, the drive tape 24 is engaged with the body part 16 approximately in the middle between the head part 15 and the leg part 17, and therefore the driving force by the drive tape 24 acts on the approximately middle part of the entire slider. Unbalanced forces acting on the entire slider are reduced, and the head portion 15 is less likely to become jammed within the head groove portion 19. Further, 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 1 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 R1 of the inner sliding surface 18A of the first shoe 18 is equal to the radius of curvature R1 of the slider groove 1 of the curved portion 13A of the guide rail 13.
Since the radius of curvature R2 is set smaller than the radius of curvature R2 of 4, the curved portion 13A is also supported at two points at both ends in the running direction, and therefore the slider 9 can always move smoothly in a stable state in the running direction. Become. Further, since the slider 9 slides in the slider groove 14 of the guide rail 13 via the first shoe 18 and the second shoe 21 made of a material with extremely low frictional resistance, the frictional resistance during movement is reduced and smooth movement is achieved. movement becomes 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. 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 retractor 6 suddenly stops unwinding the webbing 1, so 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. This prevents the occupants from being thrown forward of the wheels 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 occupant 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 disposed on the retreating end side 13C of the guide rail 13, the strength of the guide rail 13 is improved, and the guide rail 13 does not open even with a large webbing tension F, and the slider 9
is securely held on the guide rail 13. Also,
As described 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 legs 17 of the slider 9 are bent into the body 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 is moved to 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 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, sufficient strength can be ensured by the downsized slider and guide rail, and the slider can run smoothly along the guide rail.

In addition, since the slider stop mechanism is provided at the end of the retreating end of the guide rail, it is possible to reliably stop the slider at a predetermined position, and at the same time when the slider operates the actuator of the slider stop mechanism, the slider Since the stop switch comes into contact with a buffer member that absorbs the inertial force of the slider, the stopping sound of the slider is eliminated, and the stop switch is prevented from being damaged by the collision of the slider, extending the life of the stop switch. be 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 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, 13A
...Retreat end side guide rail, 14...Slider groove, 15...Head part, 16...Body part, 17
... Leg portion, 18 ... First shoe, 18A ... Inner sliding surface, 21 ... Second shoe, 24 ... Drive tape, 38 ... Stop switch, 39 ... Actuator, 40 ... Damper rubber.

Claims (1)

[Claims] 1. A guide rail that is laid on the vehicle body and has a guide groove, a slider that has a sliding part that is slidably inserted into the guide groove of the guide rail, and a webbing connecting part to which one end of the occupant restraint webbing is attached; a slider drive section that moves the slider in accordance with the getting on and off of the passenger; an actuator that is disposed near the end of the guide rail and is operated by the sliding section of the slider; A slider stopping mechanism includes a stop switch that stops the slider drive section, and when the actuator is operated by the sliding section of the slider,
A seat belt device comprising: a buffer member that buffers movement of the sliding portion in the actuator operation direction.