JPH0229002Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for use in an automatic seat belt system to move a seat belt between an occupant restraint position and an occupant release position.

Webbing in an automatic seat belt system is created by winding a flexible drive member, which has one end attached to a rotating member and the other end attached to webbing or a movable anchor to which the webbing is attached, to the rotating member and extruding it from the rotating member. In a conventional drive device that moves the driver between an occupant restraint position and an occupant release position, the drive member is guided to an entrance provided on the fixed side that is in the same plane as the drive member winding space in the direction of the rotational axis of the rotating member. It was being pushed out from there. Therefore, the drive member that tends to swell outward in the radial direction when being pushed out from the rotating member is the same as the drive member that tends to swell outward in the radial direction when it is pushed out from the rotating member. The members are strongly pressed against the wall that restricts them, or the drive members wound in multiple pieces exert friction on each other.
As a result, in this type of conventional device, even if the rotating member rotates to push out the driving member, the driving member is likely not to be pushed smoothly from the outlet due to the friction between the wall surface and the driving members. Ta.

Therefore, an object of the present invention is to form a spiral groove in a rotating member to accommodate the driving member so that the driving member does not bulge outward in the radial direction even when it is pushed out from the rotating member, thereby reducing friction with the stationary wall surface. An object of the present invention is to provide a drive device for an automatic seat belt in which the smooth extrusion of a drive member from an outlet is not hindered by operation or the like.

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

FIG. 1 shows a schematic overview of an automatic seat belt device provided with an embodiment of the drive device according to the invention. A retractor 2 is attached to the inner side of the seat 1, from which a webbing 3 extends and reaches a movable anchor 4. The movable anchor 4 is movable back and forth along a guide member 5 attached to the outer roof side of the seat 1. The movable anchor 4 extends within the tube 6 and is wound up by a take-up device 7, and a band-shaped flexible driving member 8 (see FIG. 2 and below) is extruded from this.
driven by When the drive member 8 is wound up by the take-up device 7 and the movable anchor 4 moves rearward to take the position where it is latched by the latch part 9, that is, the occupant restraint position, the webbing 3 is moved around the occupant 1 as shown by the solid line.
Constrain 0. When the driving member 8 is pushed out from the winding device 7 and the movable anchor 4 moves forward, that is, assumes the occupant release position, the webbing 3 releases the occupant 10 as shown by the chain line, allowing the occupant to get on and off the seat 1.

In FIG. 2 showing details of the winding device 7, a rotating member 11 to which one end 8a of a driving member 8 is attached is rotated clockwise or counterclockwise by a motor 12 via a gear train (not shown). Accordingly, the drive member 8 is wound up or pushed out. The rotating member 11 is formed with a spiral groove 13 for orderly winding and extrusion of the driving member 8.

As shown in FIG. 3, which is a sectional view taken along line AA in FIG. 2, the spiral groove 13 is open downward and has a depth smaller than the width of the belt-shaped drive member 8. Spiral groove 1
3, a fixed side member 14 is provided on the fixed side, and has an entrance/exit 15 for guiding the driving member 8 into the tube 6 and an inclined surface for guiding the driving member 8 from the groove 13 to the entrance/exit 15. Completed guide section 16
is formed. The entrance/exit 15 is formed at a position offset from the groove 13 in the direction of the rotation axis of the rotating member 11 . The amount of shift is related to the depth of the groove 13, and if this depth is the same as the width of the drive member 8, it is necessary to shift by this width, but as shown in FIG. If it is smaller than the width, the entrance/exit 15 can be formed closer to the groove 13 side by the smaller width.
Therefore, the winding device 7 becomes smaller.

Next, regarding the guide portion 16 of the fixed side member 14,
The guide portion 16 is formed in relation to the inlet/outlet 15 so that the drive member 8 is released from the restraint of the groove 13 near the contact point of the tangent extending from the inlet/outlet 15 to the circumference of each groove of the spiral groove 13. Desirable for smooth winding and unwinding of member 8. As an example, there is a guide portion 16 formed as a tapered inclined groove as shown in FIG. This guide portion 16 is a wall surface 2 formed approximately along a tangent line extending from the entrance/exit 15 to the outermost and innermost peripheries of the spiral groove 13.
5,26.

Further, one method of attaching one end 8a of the driving member 8 to the rotating member 11 is to engage the uneven portion 27 of the rotating member 11 and the uneven portion 28 of the driving member 8 as shown in FIG.

The operation of this embodiment will be explained based on the above configuration.

When the occupant 10 sits on the seat 1 and closes the door (not shown), for example, a door switch (not shown) senses this and the motor 12 begins to rotate, causing the rotating member 11 to rotate clockwise in FIG. 13. Start winding in an orderly manner. At this time, Tube 6,
The driving member 8 entering through the entrance/exit 15 is guided by the guide portion 16 to the level of each groove of the spiral groove 13 and is smoothly wound up. As the drive member 8 is wound up, the movable anchor 4 connected thereto is moved rearward from the front occupant release position to the occupant restraint position. When the movable anchor 4 reaches the latch portion 9 and is locked there, a switch (not shown) is activated and the motor 12 is stopped.
As a result, the occupant 10 is restrained by the webbing 3 shown in solid lines in FIG.

Next, when the occupant 10 opens the door, the door switch senses this as described above, and the motor 12 begins to rotate in reverse, causing the rotating member 11 to begin rotating counterclockwise in FIG. 2. This causes an extrusion force to act on the drive member 8,
The drive member 8 in the groove on the outer circumferential side of the spiral groove 13 is smoothly guided in order through the guide portion 16 to the entrance/exit 15 and enters the tube 6 . At this time, a force is applied to the driving member 8 that tends to expand outward, but since this is restricted by the spiral groove 13, the driving member 8 does not come into strong contact with the stationary wall surface of the stationary side member 14, and the force acts on the driving member 8 to expand outward. As a result, the extrusion force is smoothly and quickly pushed without being reduced.

In this way, the movable anchor 4 is moved forward by the pushed-out drive member 8, and when it reaches the occupant release position, a switch (not shown) is activated and the motor 1 is activated.
Stop 2. This allows the occupant to leave the seat 1 without being obstructed by the webbing 3.

FIG. 6 shows a pressing member 3 near the entrance/exit 15 of the fixed side member 14, which is biased inwardly by a spring 30.
1 is shown. This eliminates the possibility that the drive member 8 is bent near the entrance/exit 15, and the drive member 8 is pushed out more smoothly.

FIG. 7 shows a modification in which a movable guide member 33 is biased inwardly by a spring 32, and the driving member 8 is passed through a guide path 34 of the guide member 33. The only difference is that the operation and effect are almost the same as the example shown in the figure.

FIG. 8 and FIG. 9, which is a sectional view taken along line B-B, show a modified example having a movable guide member 35 provided to move in conjunction with the winding diameter of the drive member 8, and this interlocking is This is done by engaging the protrusion 36 of the guide member 35 with the spiral groove 13 of the rotating member 11. Thereby, the drive member 8 can be pushed out more smoothly and without bending. Furthermore,
There is no play in the drive member 8 within the drive device, and the movement of the movable anchor becomes smooth.

Next, the driving member 8 is placed on the outermost side of the spiral groove of the rotating member.
A second embodiment in which one end 8a of the is attached will be described. In this embodiment, as shown in FIG.
It is guided by 5. Further, the spiral groove 43 has a depth that is approximately the same as the width of the drive member 8, as shown in FIG. 11, which is a sectional view taken along line CC in FIG. The operation is substantially the same as that of the first embodiment, but if the drive device 7 is of the second embodiment in the arrangement shown in FIG. Since the drive member 8 extends outward from the inner groove to the entrance/exit port 15, a relatively small amount of the drive member 8 is wound up or pushed out for the same amount of rotation of the rotating member 41, and is therefore closer to the passenger. The movement of the movable anchor 4 becomes slower on the side, which is preferable for safety.

By the way, the driving member 8 is as shown in FIG.
By making the central part of the width of the cross-sectional shape slightly thicker, the contact area with the wall surface of the groove, etc. is reduced, and the winding and extrusion of the drive member 8 becomes smoother.

Incidentally, in the above embodiments, the entrance/exit 15 is provided parallel to the rotation axis of the rotating member, but as in the third embodiment shown in FIGS. 13 and 14, the guide portion 16
The inclined surface may extend as it is, and the entrance/exit 45 may be provided at an angle to the rotation axis of the rotating member 41. This makes the winding and pushing out of the drive member 8 smoother. In the third embodiment, like the second embodiment, one end of the drive member 8 is attached to the outermost side of the spiral groove, and a movable guide member 35 as shown in FIG. 8 is provided.

Furthermore, although a belt-shaped driving member is used in the above embodiments, a rope-shaped driving member having a circular cross section can also be used.

As described above, according to the present invention, since the driving member is wound up and pushed out in an orderly manner along the spiral groove of the rotating member, the contact area between the driving member and the stationary wall surface is reduced, and the driving member is smoothly driven. be done.

[Brief explanation of the drawing]

Fig. 1 is a schematic overall view of an example of an automatic seat belt device, Fig. 2 is a partially cutaway front view of the first embodiment of the present invention, and Fig. 3 is an A-A in Fig. 2.
A cross-sectional view, Figure 4 is an explanatory diagram of the lap-shaped guide groove, and Figure 5 is a cross-sectional view.
The figure is an explanatory diagram of a method of binding the drive member, FIG. 6 is an explanatory diagram of a modification in which a pressing member is provided, FIG. 7 is an explanatory diagram of a modification in which a movable guide member is provided, and FIG. 8 is an explanatory diagram of a modification in which a movable guide member is provided. FIG. 9 is a sectional view taken along the line BB in FIG. 8, FIG. 10 is a partially cutaway front view of the second embodiment, and FIG. 12 is an explanatory diagram of a drive member with a thick center portion, FIG. 13 is a partially cutaway front view of the third embodiment, and FIG. 14 is a side view of the same. be. Explanation of the symbols of the main parts: driving member...8, rotating member...11, 41, spiral groove...13, 43, outlet...15, 45.

Claims (1)

[Scope of utility model registration request] A drive device for moving a movable anchor movable along a guide member to which one end of webbing is attached between an occupant restraint position and an occupant release position using a flexible drive member, the drive device comprising: A rotating member is attached to one end of the driving member for transmitting the driving force to the movable anchor and for pushing out or winding up the driving member, and the rotating member has a spiral shape for accommodating the rolled-up driving member. Driving an automatic seat belt, comprising a space formed by a groove, and the driving member is pushed out or wound up through an entrance and exit located at a position offset from the space in the direction of the rotational axis of the rotating member. Device.