JPS5941166Y2 - automatic belt device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic belt device that automatically releases or restrains an occupant in response to the 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. 1.

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 loose walk 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 a flexible drive member, for example, which is reciprocated by a drive source 13. It is attached to one end of a guard wire 11 having spiral teeth on its outer periphery, and is configured to reciprocate the automatic belt 4 between a restraining position and a releasing position.

A part of this guard wire 11 meshes with a gear (not shown) of a drive source 13, and the other part is connected to an outer tube 12 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 occupant's legs in 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 restricted.

In addition, the drive source for the guard wire must be installed at a location far away from the guide rail, which limits the mounting location.Furthermore, the outer peripheral surface of the guard wire has spiral teeth for driving it. It had many drawbacks, such as having to make a formal appearance and making it cumbersome.

This invention was made based on the above-mentioned circumstances, and has an extremely simple structure, making it possible to make the entire device compact, and also allows the strip wound around the rotating body to be wound under tension. This allows the belt guide member to reciprocate accurately without any slack.
Even if the strips stop while the drive unit is rotating, the strips will not loosen, and the six-piece alignment of the strips can be performed accurately, with high reliability. The object is to provide an automatic belt device that can supply products at the listed price.

This invention will be explained with reference to an embodiment shown in the drawings.

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

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 (not shown) at the front in the figure for allowing the tip of a slide anchor 21 (described later) to protrude outward, and the upper guide rail 20B is an opening 2 located at the bottom in the figure that communicates with the slider guiding guide rail 20A.
0b.

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 horizontally elongated sliding holes 21A, 21A formed in the middle part.
A. Inside 21A is a pin 22A that is erected on the side of the 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. 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, which is provided with a horizontal plate-like sliding piece 25A that slides upwardly within the tape guiding guide rail 20B. The flat plate portion is fixed via a suitable fixture such as a pin 26.

At the top of the upper sliding piece 25A of this mounting piece 25, there is a thick flat strip (hereinafter also referred to as tape) 2, the details of which will be described later.
The tip of 9 is attached via a suitable fixing device such as a flat head screw 27.

Moreover, the above-mentioned upper guide I/-! - The rod 20B is for guiding the tape 29, and therefore its height and width are designed to prevent the tape 29 being guided from bending.

The other end of the tape 29 is guided by a slide rail 28 connected to the rear end of the guide rail and extends to the drive section 30.

This slide rail 28 has a guide hole 28a having a cross-sectional shape similar to that of the tape 29 (for example, a rectangular shape), and the tape 29 can slide in the guide hole 8a in a state in which it is almost in close contact with the tape 29. Designed to size.

The drive section 30 has a tape winding section 31 and a drive motor 32. The tape 29 can be moved in the forward direction A1 and the backward direction A2 based on the forward and reverse rotation of the drive motor 32.

Next, the details of the configuration of the drive section 30 will be explained with reference to FIGS. 3, 4, and 5.

Here, FIG. 3 is a front view showing the state of the strip before winding, FIG. 4 is a front view showing the state of the strip after winding, and FIG.
The figure is a longitudinal sectional side view taken along the line V-■ in FIG. 4.

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 (not shown) in a recess 33A provided in the intermediate part of the fixed plate 33, and one end is connected to a power transmission part (not shown) in the reducer 34. (not shown)
A shaft 35 is provided, which is connected to the shaft 35, has a locking portion at the other end, and has a protruding tip portion.

A rotating body (hereinafter also referred to as a drum gear) 36 is inserted through the shaft 35, and is fixed by mounting pieces 38a and 38b screwed into threaded portions formed on the shaft 35.

As a result, the drum gear 36 is configured to be rotated in forward and reverse directions by the drive motor 32.

Further, the drum gear 36 is composed of front and back plates 36A and 36B made of synthetic resin, for example, and an intermediate plate 36C made of a metal material interposed therebetween. It is integrally constructed with an appropriate fixing device (in addition, it may be constructed integrally with a metal material, etc.)
.

A plurality of (eight radially in the figure) teeth 36E in the form of a relatively long protrusion are provided at appropriate positions on the outer peripheral surface of the intermediate plate 36C of the drum gear 36. Opening 29A of the strip (hereinafter also referred to as tape) 29 whose details will be described later.

29B, . . . , 29N are engaged and disengaged, and in this way the tape 29 is wound around the outer peripheral surface of the drum gear 36.

Further, the recess 33A of the fixing plate 33 and the tape 2
At the winding position 9, first and second recesses 39A and 39B communicating with the recess 33A are formed, respectively, and one end is pivotally supported in the first recess 39A via a pin 40. and a first pressing member 41A that is swingable in the direction of arrow X.
is located.

A first groove 42A that avoids the teeth 36E of the drum gear 36 is formed on the surface of the first pressing member 41A facing the drum gear 36.
A curved portion 43A is formed so as to be in close contact with the tape 29 wound around the drum gear 36.

Further, at the other end of the first pressing member 41A, an engaging portion (an engaging recess in the figure) 4 of a second pressing member 41B, the details of which will be described later, is provided.
An engaging part (engaging protrusion in the figure) 44A that engages with the engaging part (engaging recess in the figure) 44B that engages with the second pressing member 4B is provided. It is configured to move following the member 41B.

A second pressing member 41B that can freely reciprocate in the direction of the arrow y is disposed within the second recess 39B, and the second pressing member 41B is urged toward the drum gear 36 by a biasing member, such as a spring 45. It is configured such that its tip always presses the tape 29 of the drum gear 36.

Further, a curved portion 43B is formed at the tip thereof so as to be in close contact with the tape 29.

Further, a second groove 42B is formed on the opposing surface of the drum gear 36 to avoid the teeth 36E of the drum gear 36, and an engagement recess 44B that engages with the engagement protrusion 44A of the first pressing member 41A. is provided.

Further, an engaging portion (hereinafter also referred to as an engaging protrusion) 37 is disposed on the side of the second pressing member 41B, and this engaging protrusion 37 forms an engaging recess of the regulating members 54A and 54B, which will be described later. 5
It is designed to engage and disengage from 7A and 57B.

In addition, in the embodiment, the first and second pressing members 41A
, 41B is shown, but the present invention is not limited to this, and the same effect can be obtained even if at least one is provided. Although shown in the figure, the first pressing member 41A is configured to operate in conjunction with the second pressing member 41B, but the first pressing member 41A may be provided with a separate biasing member so that the first pressing member 41A operates separately. In this case, the engaging portions 44A, 44 of the first and second pressing members 41A, 41B
Each of B can be omitted.

Further, at a position adjacent to the second pressing member 41B (on the opposite side of the first pressing member 41A), a regulating member 54A, which will be described later, is provided.
, 54B is provided in a protruding manner.

Furthermore, a pair of regulating members 54A and 54B are rotatably supported on one side of the drum gear 36 in the direction of arrow Z via a spring washer 55 on the rotating portion of the drum gear 36.

A regulating portion 56 is provided on the outer periphery of the regulating members 54A and 54B.
A and 56B are provided respectively, and this regulating part 5
The second pressing member 41B is provided on one side of each of 6A and 56B.
a serrated engagement recess 57A that engages and disengages the engagement protrusion 37;
57B are formed respectively.

The engagement recesses 57A and 57B are designed to prevent the second pressing member 41 from moving toward the biasing member 45 when engaged.

Engagement recess 57A of the regulating portions 56A, 56B. 57B
are configured to be out of phase with each other, and this is to narrow the pitch interval between the engagement recesses 57A and the engagement recesses 57A to further improve accuracy.

Furthermore, the number of regulating members 54A, 54B is not necessarily limited to two, but can be any number as required.

Furthermore, when the tape 29 is unwound, the pair of regulating members 54A and 54B are moved in the direction of the arrow Z by the rotation of the drum gear 36.
direction and stops when it comes into contact with the stopper pin 53,
The engagement recesses 57A and 57B of the regulating portions 56A and 56B are spaced apart from the engagement protrusion 37 of the second pressing member 41B, and the second
As the tape 29 increases, the suppressing member 41B moves against the biasing force of the biasing member 45.

On the other hand, when extruding the tape 29, the second pressing member 41B
The engaging concave portions 57A and 5713 of the regulating members 54A and 54B engage with the engaging protrusion 37 to restrict movement of the second pressing member 41B toward the biasing member 45 side.

Therefore, even if the movement of the tape 29 stops while the drive section 30 is rotating, the second pressing member 41B does not move and the tape 29 stops moving.
The openings in the tape 29 and the teeth 36E of the drum gear 36 will not be misaligned.

In addition, a tape entrance/exit 33 formed in a part of the fixing plate 33
One end of a slide rail 28 for guiding a tape 29 is inserted and fixed into C.

Further, each of these members is entirely covered by a cover 46.

Next, the details of the structure of the tape 29, which is the strip, will be explained with reference to FIG.

This tape 29 has a rectangular cross-sectional shape, is made of a hard elastic material such as synthetic resin (nylon or polyurethane), and engages and disengages from the teeth 36E provided on the drum gear 36 in the longitudinal direction. Multiple openings 29A, 29B, 29C,...2 of possible sizes
9N are provided at desired intervals, and one end thereof is fixed to the outer circumferential portion of the drum gear 36 with a fixing device such as a screw 47 through the mounting hole 29a.

And each of the openings 29A, 29B,...2
The respective gaps of 9N are changed depending on the winding around the drum gear 36.

That is, as the diameter of the tape 29 wound around the drum gear 36 increases, the interval between the holes also increases, and even when the tape 29 is wound in the direction of increasing layers, it always remains securely attached to the tooth portion 36E of the drum gear 36. It is possible to connect and disconnect.

It is not necessary to provide these holes in the entire longitudinal direction of the tape 29, and it is sufficient to provide them at least for the length of the tape 29 that is 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. 8a, a thin metal plate 4
8 as a core material and its surface covered with a synthetic resin material 49, or reinforced by embedding a plurality of metal wires 50 in a wear-resistant synthetic resin 51 as shown in the figure. A variety of materials can be used, such as abrasion-resistant synthetic resin with synthetic fibers embedded along its length in order to strengthen the material.

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 belt device thus constructed 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 engages with the teeth 36E provided on the outer peripheral surface of the drum gear 36.
is pushed out while slidingly contacting the first and second suppressing members 41A and 41B.

As a result, the tape 29 is guided by the slide rail 28 and moves in the direction of arrow A1 in FIG.
Sliding piece 2 in the guide rail 20B with the tip of 9 fixed
5A moves.

Then, the mover 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 automatic belt 4 to the open position.

At this time, as the tape 29 wound around the drum gear 36 decreases, the first and second pressing members 41A, 4
1B protrudes toward the drum gear 36 side by the biasing force of the spring 45 and constantly presses the tape 29 of the drum gear 36, so that the tape 29 does not loosen.

That is, the engagement recesses 5 of the pair of regulating members 54A, 54B
7A and 57B are the engagement protrusions 37 of the second pressing member 41B.
As the tape 29 decreases, the second pressing member 41B moves while shifting the engagement part 1. On the other hand, if the tape 29 stops moving while the drum gear 36 is rotating, Even if the second suppressing member 41B presses the tape 29, the engaging protrusion 37 is the regulating member 54A,
Since the tape 29 is engaged with the engagement recesses 57A and 57B of the tape 54B, movement toward the biasing member 45 is restricted, and as a result, the tape 29 does not loosen.

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 engage with the teeth 36E 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.
moves backward 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, thereby locking the restraint state.

At this time, the tape 29 wound on the surface of the drum gear 36 of the winding portion 31 is
Since the tape 29 is pressed against the drum gear 36 by the pressing force of the tape 41B, the tape 29 can be rewound accurately.

Further, the pair of regulating members 54A. 54B rotates in the direction of arrow Z when the drum gear 36 rotates to engage the engagement recess 57A,
57B is disengaged from the engaging protrusion 37 of the second suppressing member 41B, and as the tape 29 is sequentially wound around the drum gear 36 and increases in number, the first and second pressing members 41A and 41B are removed from the biasing member 45. The first and second pressing members 41A and 41B are kept in contact with the tape 29 at all times.

In the above operation, the tape 29 has openings 29A,
29B.

29N is engaged with the teeth 36E of the drum gear 36 and moves while being pressed by the pressing member, so the tape moves not only during winding operation but also during pulling out or pushing out operation. will be carried out reliably and smoothly.

It goes without saying that this invention is not limited to the embodiments described above, and 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.

Further, the same effect can be obtained by providing the second pressing member with an engaging recess and providing the regulating member with an engaging protrusion.

Further, although the second pressing member is shown as having an engaging portion, the present invention is not limited to this, and the same effect can be obtained even if the first pressing member 41A is provided with an engaging portion.

As described above, this invention adopts a winding method for the belt drive mechanism, so it can be made much smaller than conventional ones, and can be easily integrated into the body of a car.
Since it is driven by the engagement between the teeth provided on the winding section and the apertures provided in the tape, it is possible to reliably perform the push-pull operation of the tape even though it is a winding method.

Furthermore, since the suppressing member is disposed adjacent to the drum gear, it can press the tape wound around the drum gear, prevent the tape from loosening, and move the tape accurately.

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

Furthermore, since the suppression member is regulated by the regulation member,
Even if the strip cannot be fed while the drive unit is rotating, the strip will not become loose and the strip can be fed reliably. Moreover, it is compact and has a simple structure. Therefore, it is easy to manufacture and has excellent effects such as cost reduction.

[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 cross section showing an example of a drive mechanism used in the automatic belt device of this invention, and FIG. FIG. 4 is a front view showing the state of the strip before being wound up, showing an embodiment of the drive unit of the mechanism. FIG. 5 is a front view showing the state of the strip after being wound. 6 is a perspective view showing the state of attachment of the tape, 7 is an explanatory view showing the state of the rotating body and the pressing member, and 8 a and b are used in this invention, respectively. It is a sectional view showing other examples of a strip. 2...Door, 3...Seat, 4...
...Automatic belt, 5...Retractor, 6...
...Buckle, 7...Tong, 8...
...Guide rail, 9...Belt guide member, 2
0... Belt guide section, 30... Drive section, 20A... Guide rail for guide of mover, 20
B...Guide rail for tape guide, 21...
... Slide anchor, 22 ... Mover, 2
5...Mounting piece, 28...Slide rail, 29...Tape, 29A, 29B~29
N...Opening hole, 31...Tape winding part,
32... Drive motor, 33... Fixed plate, 34... Reducer, 35... Shaft, 36... Drum gear, 36E... ...Tooth portion, 37...Engagement protrusion, 38a...Mounting piece, 39A, 39B...Recess, 41A,
41B... Suppression member, 42A, 42B...
...Groove, 44A, 44B...Engagement part, 45
...Spring, 46...Cover, 53...
...Stopper pin, 54A, 54B...
Regulating member, 56...Spring washer, 57
A, 57B... Engagement recess.

Claims (5)

[Scope of utility model registration request] (1) Occupant restraint is achieved by reciprocating the belt guide member along a guide member installed in the center or side of the vehicle using a drive mechanism that includes a drive source that rotates forward and backward in response to the opening and closing of the door. In an automatic bell I/device in which an automatic belt for use can be shifted between a release position and a restraint position, the rotating body rotates forward and reverse in conjunction with the drive source and has a plurality of teeth on its outer circumferential surface. , one end of which is attached to one end of the belt guide member, the other end of which is attached to a part of the outer circumferential surface of the rotating body, and a plurality of teeth that engage with and disengage from teeth provided on the rotating body along the longitudinal direction. A flexible strip with openings formed therein, a slide rail that guides the strip, and an engaging portion that is biased by a biasing member to press the strip against a rotating body. A strip body comprising a pressing member and a regulating member having an engaging part that engages and disengages with the engaging part of the pressing member, and is wound around the rotating body by rotating the rotating body in forward and reverse directions by a drive source. While being pressed by a pressing member, the strip is wound around the rotating body or pushed out from the rotating body and moved, and at the same time, when the strip is wound, the engagement between the engaging portion of the regulating member and the engaging portion of the pressing member is released. Further, an automatic belt device characterized in that, during extrusion, both engaging portions are moved while being engaged with each other, thereby causing the belt guide member to reciprocate. (2) The engaging portion of the pressing member is formed of a stopper pin, and the engaging portion of the regulating member is formed of a plurality of teeth. Claim 1 of the Utility Model Registration Claim: The automatic belt device described in . (3) The automatic bell I/device according to claim 1 or 2, wherein the pressing member has a groove formed on the rotating body side to avoid the teeth of the rotating body. . (4) A utility model registration claim characterized in that the plurality of apertures formed in the strip are set such that the gaps between the apertures become wider as the distance from the mounting portion to the rotating body increases. The automatic belt device according to any one of Items 1 to 3. (5) Utility model registration claims 1 to 5, characterized in that the strip is a thick tape whose core material is a thin metal plate and whose surface is coated with a synthetic resin material. The automatic belt device according to any one of Item 4.