JPS6012763Y2 - automatic belt device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic belt device that automatically releases or restrains an occupant in response to opening and closing of a door.

Conventionally, automatic belt devices for ensuring the safety of occupants of vehicles such as automobiles have been used to restrain occupants by reciprocating a belt guide member along guide rails provided in the center or side portions of the vehicle. Many attempts have been made to move the automatic belt between a release position at the front and a restraint position at the rear.

An example of such an automatic belt device is the one shown in FIG.

In the figure, 1 is a vehicle body, 2 is a door, 3 is a seat, and 4 is an automatic belt disposed diagonally upwardly across the seat 3. It is attached to an emergency lock type retractor 5 fixed at the lower side of the side so that it can be pulled out and retracted, and its upper end is attached to a belt guide member 9 of a guide rail 8, which will be described later, via a buckle 6 and a tongue 7 so that it can be detached in an emergency. ing.

This buckle 6 is attached to a belt guide member 9 in a guide rail 8 provided in the upper part of the vehicle body 1, and this belt guide member 9 is attached to a visible drive member, for example, on the outer periphery, which is reciprocated by a drive source 13. It is attached to one end of a guard wire 11 having spiral teeth, and is configured to reciprocate the automatic belt 4 between a restraining position and a release position.

A part of this guard wire 11 is meshed with a gear (not shown) of a drive source 13, and the other part is connected to an outer tube 12 which is connected to the rear end of the guide rail 8.
It is inserted into the outer tube 12 and reciprocated within the outer tube 12 by a drive source 13 that rotates forward and backward in response to the opening and closing of the door 2.

This drive source 13 is a door detection switch (not shown) that is detected when the occupant opens and closes the door 2 to get on and off the vehicle.
The rotation is switched between forward and reverse directions.

Reference numeral 10 denotes knee pads located in front of the seat 3 to protect the legs of the occupant in the event of a collision.

However, since this type of automatic belt device reciprocates the automatic belt via a guard wire, the length of the teeth of the guard wire must be at least as long as the length between the automatic belt's restraint position and release position. , and in order to prevent the toothed part of the guard wire from protruding into the guide rail part, the toothless part of the guard wire must be provided quite long, and therefore the entire length of the guard wire becomes extremely long and it takes time to store it. There is a problem in that the outer tube and its installation area are large, and the mounting location is limited.

In addition, the drive source for the guard wire must be installed at a location quite far away from the guide rail, which limits the mounting location.Furthermore, there are spiral teeth on the outer circumferential surface of the guard wire to drive the guard wire. There were many disadvantages such as the need to form a section and the manufacturing process was troublesome.

The present invention has been developed based on the above circumstances, and is an automatic belt device that has an extremely simple configuration, can make the entire device compact, and can supply highly reliable products at low cost. The purpose is to provide the following.

The present invention will be described with reference to embodiments shown in the drawings.

FIG. 2 is a schematic diagram showing an embodiment of the belt drive mechanism in the device of the present invention.

This belt drive mechanism includes a belt guide section 20 and a drive section 30.

The belt guide section 20 includes, for example, three upper and lower guide rail members 8A to 8C attached to the roof side of the vehicle, and the two lower guide rail members 8A and 8B guide a slider having a U-shaped cross section. The guide rail 20A for guide rail 20A, and the guide rail 20B for guiding a strip (tape) described later by the upper two guide rail members 8B and 8C.
are configured respectively.

Of these guide rails 20A and 20B, the lower guide rail 20A has an opening in the front direction in the figure for allowing the tip of a slide anchor 21 (described later) to protrude outward, and the upper guide rail 20B has an opening in the downward direction in the figure. , is provided with an opening that communicates with the slider guiding guide rail 20A.

Inside the lower guide rail 20A, a slide anchor 21 is provided in which the buckle 6 is suspended at the tip and a recess 21B formed on the upper side for locking the lock pawl 24 is slidably provided with the tip protruding outward. ing.

This slide anchor 21 has a pair of sliding holes 21 in the middle part.
A, 21A are formed, and these sliding holes 21A, 21
Inside A, a pin 22A is provided upright on a mover 22, which will be described later.
22A is slidably fitted.

The mover 22 is arranged at a position in contact with the back surface of the slide anchor 21, and a recess 22B having a gentler slope than the slope of the recess 21B provided on the upper side of the slide anchor 21 is provided on its upper side. This recess 22B allows the lock pawl 24 to be pushed up and guided to the release position when the mover 22 slides forward within the guide rail 20A.

Also, on the upper side of the mover 22, a middle guide rail member 8B is provided.
A pair of guide rollers 23A, 23A are provided in contact with the lower guide rail member 8A, and a pair of guide rollers 23B, 23B are provided on the lower side thereof, respectively, in contact with the lower guide rail member 8A.
Due to the transfer of these guide rollers 23A and 23B,
The mover 22 can move smoothly within the guide rail 20A.

At the rear end (right end in the figure) of the slider 22, there is a vertical T-shaped mounting piece 25 having a horizontal plate-shaped sliding piece 25A that slides upwardly within the tape guiding guide rail 2OB. The flat plate portion is fixed via a fixing member such as a pin 26.

The top of the upper sliding piece 25A of the mounting piece 25 is attached to the tip of a flat thick tape 29, the details of which will be described later, via a fixing device such as a flat head screw 27.

The upper guide rail 20B is for guiding the tape 29, and therefore its height and width are designed to prevent the guided tape 29 from bending.

The base end of this tape 29 is guided by a slide rail 28 connected to the rear end of the guide rail to
It extends to 0.

This slide rail 28 has a guide hole with a cross-sectional shape similar to that of the tape 29 (for example, a rectangular shape), and is sized so that the tape 29 can slide into the guide hole in a state in which it is almost in close contact with the guide hole. Designed.

The drive section 30 has a tape winding section 31 and a drive motor 32.

Based on the forward and reverse movement of the drive motor 32, the tape 29
is movable in the forward direction A1 and the backward direction.

Next, the details of the configuration of the drive section 30 will be explained with reference to FIGS. 3 and 4.

Here, FIG. 3 is a partially cutaway front view, and FIG. 4 is a sectional view taken along the line A-A'.

This drive unit 30 includes a tape winding unit 31 and a drive motor 32 at a position sandwiching a fixing plate 33 that is fixed to an appropriate location on the vehicle.
A speed reducer 34 that reduces the rotational force from the engine is disposed facing the engine.

The tape winding part 31 is rotatably supported by a collar member 33A provided at the intermediate part of the fixed plate 33, and one end is connected to a power transmission part (not shown) in the reducer 34, and the other end is connected to a power transmission part (not shown) in the reducer 34. A locking portion 35A is provided on the shaft 35, and a shaft 35 with a protruding tip thereof is provided.

A drum gear 36 having an outer peripheral part 36A thicker than an inner peripheral part 36B is inserted into the shaft 35, and an engaging protrusion 37A facing inward is provided on the outside (left side in FIG. 4) of the drum gear 36. A holder gear 37 is provided which is engaged in an engagement hole 36C formed at a suitable position on the inner peripheral surface of the drum gear 36 and screwed into a threaded portion 35B formed on the shaft 35.

These drum gear 36 and holder gear 37 are connected to the shaft 3
It is fixed by a nut 38 which is screwed onto the tip of 5.

Incidentally, a sprocket-shaped tooth portion 3 serving as a relatively long protrusion is provided at an appropriate location on the outer peripheral surface of the outer thick portion 36A of the drum gear 36.
6D is provided, and an opening in the tape 29, which will be described in detail later, is engaged with the tooth portion 36D, and the tape 29 is wound in layers in this manner.

Each of these members is entirely covered by a cup-shaped cover 39 having a guide hole for winding the tape.

In addition, a tape inlet/outlet 3 formed in a part of this cover 39
One end of a slide rail 28 for guiding the tape 29 is inserted and fixed into the inside 9A.

Next, the details of the structure of the tape 29, which is the strip, will be explained with reference to FIGS. 5 and 6.

This tape 29 has a flat cross-sectional shape, is made of a hard elastic material such as synthetic resin (nylon or polyurethane), and can be engaged with the teeth 36D provided on the drum gear 36 in the longitudinal direction. multiple openings 29A, 29B, 29C, 29D...
are each provided in an elliptical shape, and the base end portion thereof is fixed to the outer peripheral portion of the drum gear 36 with a fixing device such as a screw 40 via a mounting hole 29'.

The gap between each of the openings 29A, 29B, . . . changes depending on the winding layer around the drum gear 36.

That is, as the diameter of the tape 29 wound around the drum gear 36 increases, the gap between the apertures also increases. It is designed to be able to reliably mesh with the tooth portion 36D of.

It is not necessary to provide these openings along the entire length of the tape.
It is sufficient to provide the length corresponding to the length wound around the drum gear 36.

The structure of the tape 29, which is the strip, is not limited to the above embodiment, and for example, as shown in FIG. 7a, a thin metal plate 4 is used.
1 as a core material and its surface covered with a synthetic resin material 42, or as shown in the same figure, reinforced by embedding a plurality of metal wires 43 in a wear-resistant synthetic resin 44. By using various composite materials, such as abrasion-resistant synthetic fibers or resin reinforced by embedding synthetic fibers along the longitudinal direction, it can be made flexible enough to be pushed and pulled. Improved durability can be obtained.

Further, the cross-sectional shape is not limited to a rectangular shape, but may be a trapezoidal shape or an elliptical shape.

The operation of the automatic venting device of the present invention configured as described above is as follows.

Note that the same reference numerals are used to describe the same members as in FIG. 1.

When door 2 is opened to allow passengers to get on and off the vehicle,
The drive motor 32 is rotated in the forward direction by the operation of a door detection switch (not shown), and the rotation of the motor 32 is transmitted through a reduction gear 34 to a drum gear 36 that winds the tape 29.
Since the drum gear 36 rotates, the tape 29 has an opening that meshes with the teeth 36D provided on the outer peripheral surface of the drum gear 36.
will be pushed out.

As a result, the tape 29 is guided by the slide rail 28 and moves in the direction of arrow A□ force in FIG.
The sliding piece 25A in the guide rail 20B, to which the tip of the guide rail 9 is fixed, moves.

Then, the slider 22 and the slide anchor 21 move forward within the guide rail 20A via the attachment piece 25 connected to the sliding piece 25A, thereby guiding the belt 4 to the open position.

Furthermore, when an occupant sits on the seat 3 in the vehicle with the door open and the door 2 is closed, the drive motor 32 rotates in the reverse direction due to the operation of the door detection switch, thereby rotating the drum gear 36 for winding the belt. Therefore, the tape 29 having the openings that mesh with the teeth 36D on the outer peripheral surface of the drum gear 36 is wound around the drum gear 36.

Therefore, the tape 29 is guided by the slide rail 28 and moves in the direction of arrow A2 in FIG.
2 retreats within the guide rail 20A, and as a result, the belt 4
is guided to the occupant restraint position, and the lock pawl 24 engages with the recess 21B on the slide anchor 21 to lock the restraint state.

In the above operation, the tape 29 has openings 29A and 29B.
Because the tape is moved by meshing with the teeth 36D of the drum gear 36, the tape can be moved reliably and smoothly not only during the winding operation but also during the pulling or pushing operation. Become.

It goes without saying that the present invention is not limited to the embodiments described above, and that each member can be replaced with another member having the same function.

For example, the automatic belt is not limited to a shoulder belt, but may include both a shoulder belt and a waist belt, and the belt guide member is not limited to a type in which a tongue is engaged with a buckle, but is directly attached to a slide anchor. It may also be of the type that connects belts.

Furthermore, the guide rail and the drive section may be provided on the door side.

As described above, the present invention adopts a winding storage method for the belt drive mechanism, so it can be made extremely compact compared to conventional belt drive mechanisms, and can be easily integrated into the body of a car. The tape is driven by the meshing of the teeth provided in the tape with the elliptical holes provided in the tape, so the durability of each hole is improved without cracking from the corner of the hole. Push-pull operation of the tape can be performed reliably.

In addition, since there is no need to provide teeth corresponding to the distance between the restraining position and the release position on the outer peripheral surface of the tape as in the conventional case, the drive source can be installed close to the guide rail. The installation location can be set arbitrarily.

Furthermore, since it is small and has a simple structure, it is easy to manufacture, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a conventional automatic belt device, FIG. 2 is a schematic diagram including a sectional view showing an example of a drive mechanism used in the automatic belt device of the present invention, and FIGS. FIG. 4 is a partially cutaway front view and a cross-sectional view taken along the line A-A' showing an embodiment of the drive section of the drive mechanism, and FIGS. FIGS. 7a and 7b are perspective views showing the rolled state, and sectional views showing other structures of the tape used in the present invention. 2...Door, 3...Seat, 4...
...Automatic belt, 5...Retractor, 6...
...Buckle 7 m5sses tongs, 8...
...Guide rail, 9...Belt guide member,
20... Belt guide section, 30... Drive section, 20A... Guide rail for guide of mover, 2
0B...Guide rail for tape guide, 21...
・Slide anchor, 22... Mover, 25.
...Mounting piece, 28...Slide rail,
29...Tape, 29A-29D...
Opening hole, 31... Tape winding part, 32...
・Drive motor, 33...Fixing plate, 34...
・・Reducer, 35---Shaft, 36...
... Drum gear, 36D... Teeth, 37...
...Hold gear, 38... Nut, 39.
·····cover.

Claims (1)

[Claims for Utility Model Registration] (1) A drive mechanism including a drive source that rotates forward and backward in response to opening and closing of a door causes the belt guide member to be aligned with a guide member provided in the center or side part of the vehicle. An automatic belt device that enables an automatic occupant restraint belt to be shifted between a release position and a restraint position by reciprocating the belt, which rotates forward and backward in conjunction with the drive source and has sprocket-like teeth on the outer peripheral surface. a drum gear having a distal end attached to one end of the belt guide member and a proximal end attached to a part of the outer circumferential surface of the drum gear, the distance increasing from the proximal end toward the distal end along the longitudinal direction; The drive mechanism is constituted by a flexible strip having a plurality of openings that are sequentially widened and fitted with the teeth of the drum gear, and a slide rail that guides the strip, and the drum gear is driven by a drive source. The automatic belt device is characterized in that the belt guide member is moved in a reciprocating manner by rotating the belt in forward and reverse directions, thereby laminating and winding the strip on a drum gear, or pushing it out from the drum gear and moving it. (2) Claims 1 or 2 for registration of a utility model, characterized in that the strip is a thick tape whose core material is a thin metal plate and whose surface is covered with a synthetic resin material. Automatic belt device as described in section. (3.) Utility model registration claim 1 or 2, characterized in that the strip is a thick tape whose core material is a metal wire and whose surface is covered with a synthetic resin material. Automatic belt device as described in section. (4) Utility model registration claims 1 or 2, characterized in that the strip is a thick tape whose core material is synthetic fiber and whose surface is covered with synthetic resin material. Automatic belt device as described.