JPH0336446Y2 - - Google Patents

Description

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

(Prior Art) Conventionally, automatic belt devices for ensuring the safety of occupants of vehicles such as automobiles have been designed to reciprocate a belt guide member along a guide rail provided at the center or side of the vehicle. In particular, many attempts have been made to move the automatic occupant restraint belt between a release position in the front and a restraint position in the rear.

An example of such an automatic belt device is the one shown in FIG. 4. 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 rolled up and stored in an emergency locking type retractor 5 fixed to the lower part of the inner surface so that it can be pulled out and retracted, and the upper end can be removed in an emergency via a buckle 6 and a tongue 7 to a belt guide member 9 of a guide rail 8, which will be described later. is attached to. This buckle 6 is attached to a belt guide member 9 within a guide rail 8 provided in the upper part of the vehicle body 1. This belt guide member 9 is attached to one end of a flexible drive member that reciprocates by a drive source 13, for example, a geared wire 11 having a spiral toothed portion on its outer periphery. 4 is configured to reciprocate between a restraining position and a releasing position. A part of this gear wire 11 meshes with a gear (not shown) of a drive source 13, and the other part is connected to an outer tube 1 connected to the rear end of the guide rail 8.
The outer tube 12 is inserted into the outer tube 2 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 configured to rotate in forward and reverse directions by being switched by a door detection switch (not shown) which is sensed when an occupant opens or closes the door 2 in order to get on or off the vehicle.

Reference numeral 10 designates 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 geared wire, the length of the teeth of the geared wire is at least as long as the length between the restrained position and the released position of the automatic belt. In addition, in order to prevent the toothed portion of the geared wire from protruding into the guide rail portion, the toothless portion of the geared wire must be provided for a considerable length. Therefore, the overall length of the geared wire is extremely long. The problem is that the outer tube is long and requires a large outer tube to accommodate it and a large installation area, which limits the mounting location. In addition, the drive source for the geared wire must be installed at a location quite far from the guide rail, which limits the installation location. There were many drawbacks, such as the need to form toothed portions, making the manufacturing process cumbersome.

Therefore, the present inventor focused on the problem of the drive mechanism in the conventional automatic belt device, and used a flexible strip instead of the geared wire, and fixed the belt guide member to the tip of the strip. At the same time, the proximal end of the strip is fixed to the outer periphery of a first drum which is rotated in forward and reverse directions by a motor together with one end of a strip of a required length, so that they can be wound up and unwound together in an overlapping state. At the same time, the other end of the strip plate is fixed to the outer periphery of a second drum disposed on the side of the pull-out path of the strip pulled out from the first drum, and separated from the strip. In addition, it can be rolled up and rolled up.
By interlocking the drum shafts of the first drum and the second drum with each other via an interlocking mechanism such as a gear or a timing pulley,
and an automatic machine equipped with a compact drive mechanism that winds or extrudes the strip while clamping it with a band plate and moves it in the longitudinal direction by rotating a second drum, thereby reciprocating the belt guide member. He first proposed a belt device (see Utility Application No. 59-194525) (Problems to be solved by the invention) By the way, in the drive mechanism of the automatic belt device that the present inventor previously proposed, the first problem was still When the drum and the second drum are interlocked with each other through an interlocking mechanism that does not cause slippage, such as a gear or a timing pulley, the rotation ratio of the first drum and the second drum is always constant. Nevertheless, the actual winding diameter during winding and unwinding increases and decreases alternately depending on the thickness of the strip and strip, and the diameter of the first drum that winds the strip and strip in a superposed state increases and decreases depending on the thickness of the strip and strip. The change in the winding diameter is larger than that of the second drum, which winds only the strip, and an error occurs in the winding/unwinding speed between the two. There is a possibility that play may occur due to loosening, slowing down the moving speed of the strips, or causing the strips or strips to buckle and break midway, and there remains room for further improvement in this regard.

The present invention has been made in view of the above circumstances and to improve the problem.The present invention is aimed at reducing the phase error between the first and second drums, strips, and strips during winding and unwinding. This problem is solved by absorbing the displacement by a spring interposed between the belt plate and maintaining the band plate in a tightly wound state at all times.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained based on FIGS. 1 to 3 corresponding to embodiments.

Guide rail 8 of an automatic belt device as shown in Fig. 3
The flexible strip 21 whose tip end is fixed to the belt guide member 9 inserted through the belt guide member 9 has its proximal end attached to one end of a strip plate 35 of a required length around the outer periphery of the first drum 26 provided in the drive mechanism 20. The other end of the strip plate 35 is attached to the first drum 26 in a superimposed state with the strip plate 35, and the other end of the strip plate 35 is attached to the pull-out path side of the strip 21 in the vicinity of the first drum 25. is fixed to the outer periphery of the second drum 34 disposed on the side,
As the second drum 34 rotates, it separates from the strip 21 and winds up only the strip 35. Further, the strip 21 unwound from the first drum 26 and separated from the strip plate 35 is guided to the belt guide member 9 through an elongated guide passage 39.

The first sheet 26 and the second drum 34
The drum shafts 24 and 33 that support the drum shafts are respectively interlocked with each other via non-slip interlocking mechanisms 41 using gears or timing belts, and one of the drum shafts 24 is connected to a drive source 45. Of the first and second drums 26, 34,
At least one of the drums 26 is supported by the drum shaft 24 so as to be relatively rotatable within a required angular range.

Further, the drum 26, which is rotatably supported by the drum shaft 24, is constantly rotated in the direction of winding the band plate 35 by springs 31, 31', 31'' interposed between the drum shaft 24 and the drum shaft 24. It is dynamically energized.

(Function) The automatic belt device having the above-mentioned configuration is configured such that the drum shaft 24 of the first drum 26 is moved by the drive source 45 in the direction indicated by the arrow.
By rotating in the _X1 direction, the first drum 26 is rotated in the same direction, and the first drum 26
winding the strip 21 and the strip 35 in a polymerized state;
By sliding the strip 21 in the direction of arrow _X2 , the belt guide member 9 is moved to the occupant restraint position, and
On the other hand, when moving the belt guide member 9 to the release position side, the second drum 34 is rotated in the direction of arrow _Y1 , and the belt plate 35 wound around the first drum 26 is rotated.
The strip 2 is rolled up and extruded together with the strip 35.
1 in _{the two} directions of arrow Y. During this period, the rate of decrease in the winding diameter of the first drum 26 gradually increases, and conversely, the rate of increase in the winding diameter of the second drum 34 gradually decreases, but the rotation ratio of the drum shafts 24 and 33 remains constant. Therefore, the strip 2 on the outer periphery of the drum 26
1 and the strip 34 tend to loosen, but the strip 2
The first drum 26 is disposed between the drum shaft 24 and the first drum 26 to which the belt member 1 and the band member 35 are fixed on the outer periphery.
Springs 31, 31', which bias the winding direction
31'', the slack at this time is absorbed by the relative phase change between the drum 26 and the drum shaft 24 and the displacement of the springs 31, 31', 31'', and the band plate 35 is tensioned. kept in condition.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

Fig. 1 is a side sectional view showing an example of a drive mechanism applicable to the automatic belt device of the present invention, Fig. 2 is a sectional view taken along the line - in Fig. 1, and Fig. 3 is an example of the automatic belt device of the present invention. FIG.

The automatic belt device of the present invention slides back and forth along a guide rail 8 provided on the roof side of the vehicle body 1 in response to the opening and closing of the door 2, and is pulled out from an emergency locking retractor 5 provided on the side of the seat 3. a belt guide member 9 for displacing the seat belt 4 between the front occupant release device (indicated by a two-dot chain line in FIG. 3) and the rear occupant restraint position (indicated by a solid line in FIG. 3); rear car body 1
It is configured to include a drive mechanism 20 provided at Belt guide member 9
The belt guide member 9 is configured to be able to slide within the guide rail 8 as the strip 21 is pushed and pulled by the drive mechanism 20 and moves.

The strip 21 has a rectangular flat cross-sectional shape,
Usually, a hard elastic material such as one made of synthetic resin (nylon or polyurethane), a metal plate or metal wire coated with a synthetic resin as a core material, or a metal plate having the same cross-sectional shape are used.

As shown in FIGS. 1 and 2, the drive mechanism 20 for the strip 21 in the automatic belt device operates within a large-diameter storage chamber 23 formed in the casing 22.
A first drum 26 is rotatably fitted onto a drum shaft 24 passing through 2b through a sleeve 25, and three arcuate grooves 27, 27 are formed on the side surface of the first drum 26. ', 27'' is the drum shaft 2
By indenting the claws 29, 29', and 29'' of the triangular cam plate 28 fixed to the shaft end of the drum 24, the first drum 26 is supported by the drum shaft 24 so as to be relatively rotatable within a required angular range. In addition, the claw portions 29, 29', 29'' are configured to be able to rotate together when engaged with each end of the grooves 27, 27', 27'', and the grooves 27, 27' , 27'', and the claws 29, 29', 29'' of the cam plate 28.
Tension springs 31, 31', 31'' are tensioned.

Further, a second drum 34 fixed to a drum shaft 33 rotatably inserted through the intermediate wall 22a is housed in a small-diameter storage chamber 32 provided in the casing 22 adjacent to the large-diameter storage chamber 23. has been done.

The first drum 26 has a strip 21 whose tip end is fixed to the belt guide member 9 on its outer peripheral surface.
and one end of the strip plate 35 of the required length with the screw 3.
6, and these strips 21 and strips 35
The material is wound up in a polymerized state and then wound so that it can be unwound.

The second drum 34 also connects the other end of the band plate 35 wound around the first drum 26 with a screw 37.
The strip 21 is fixed to the outer periphery of the strip 21 and can be wound up separately from the strip 21, and the strip 21, which has been pulled out from the first drum 26 and separated from the band plate 35, is attached to the large diameter storage Chamber 23 and small diameter storage chamber 32
is inserted into a guide passage 39 extending substantially tangentially to the large-diameter storage chamber 23 from a communication portion 38 with the large-diameter storage chamber 23;
The belt guide member 9 is slidably guided through the slide rail 40.

The strip plate 35, which is fixed at both ends to the first drum 26 and the second drum 34 and wound around each drum, has a full length slightly longer than at least the moving distance of the belt guide member 9, and has a long longitudinal direction. It is made of a material with very little elongation in the direction and high tensile strength, such as a metal band plate, and also to suppress an increase in the winding diameter when it is wound around the first drum 26 in a superposed state with the strip 21. , it is preferable to use as thin a material as possible.

On the other hand, 41 is a gear chamber 42 of the casing 22.
an interlocking mechanism housed in the interlocking mechanism 41;
is composed of a large-diameter gear 43 fixed to the shaft 24 of the first drum 26 and a small-diameter gear 44 fixed to the shaft 33 of the second drum 34;
A drive motor 4 connected to the shaft 24 of the drum 26 of
The rotational torque of 5 is applied to the large diameter gear 43 and the small diameter gear 4.
4 to the second drum 34, and the first
The second drum 26 and the second drum 34 are rotated in opposite directions.

Reference numeral 46 denotes a holding member disposed in the middle of the pull-out path of the strip 21, and the holding member 46 has a side surface 46a parallel to the side surface of the guide passage 39 and prevents the casing 22 from sliding. The arc-shaped guide surface 46b at the tip is always connected to the first drum 26 by a spring 48 contracted between the bottom of the guide groove 47 and the bottom of the guide groove 47.
It is biased in a direction to press against the outer surface of the band plate 35 wrapped around.

The automatic belt device of the present invention has the above-mentioned configuration, and its operation will be explained next. First, the belt guide member 9 is in the occupant restraining position on the rear end side of the guide rail 8, as shown by the solid line in FIG. 3. In this state, when the door 2 is opened, the drive motor 45 is activated by the operation of a door detection switch (not shown).
rotates forward, and the second drum 34 is rotated in the direction of arrow _Y1 in FIG. 1 via the large-diameter gear 43 and the small-diameter gear 44. At this time, the band plate 35 whose one end is fixed to the second drum 34 is attached to the first drum 2.
6, the strip 21 is returned together with the strip 21, separated from the strip 21 and wound onto the second drum 34, and wound around the first drum 26. It is pushed out in the tangential direction while being clamped to the band plate 35.

During this time, the winding diameter of the first drum 26 rapidly decreases due to the unwinding of the strip 21 and the strip plate 35, and at the same time, the winding diameter of the second drum 34 gradually increases as the strip plate 35 is wound. Although the strips 21 are considerably larger than the thickness of the strip plate 35 and the winding diameter reduction rate of the first drum 26 is greater than that of the second drum 34, the drum shafts 24 and 33 are interlocked. Due to the action of the mechanism 41, the first
The first drum 26 attempts to rotate faster than the actual rewinding speed, but the first drum 26
The drum 26 is rotatably supported within a required angle range, and the drum 26 is mounted on the drum shaft 24.
On the other hand, since the springs 31, 31', and 31'' are biased in the strip winding direction, the phase of the drum 26 with respect to the drum shaft 24 is delayed by the amount of slack in the strip, and the slack in the strip 35 is removed. While holding the strip 21 in place, the strip 21 is reliably pushed out in the longitudinal direction.

As a result, the strip 21 is guided by the guide passage 39 and the slide rail 40 and moves in the direction of arrow _Y2 in FIG. Along the 3rd
It moves to the release position side shown by the two-dot chain line in the figure.

Further, when an occupant sits on the seat 3 in the vehicle with the door open and the door 2 is closed, the drive motor 45 rotates in the reverse direction due to the operation of the door detection switch, and the cam plate 28 fixed to the drum shaft 24 rotates in the opposite direction. When the cam plate 28 is rotated in the direction of arrow _X1 in FIG. 1, the first The drums 26 rotate in the same direction, and the first drum 26 winds up the strip 21 in a superposed state together with the strip 35 wound around the second drum 34 around its outer periphery. Therefore, the strip 21 is guided by the slide rail 40 and the guide path 39 and moves in the direction of arrow _X2 in FIG. 9 to the occupant restraint position, where the restraint state is locked by a known locking mechanism.

Also, while the strip 21 and the strip plate 34 are being wound around the first drum 26, the springs 31, 31',
31'' are maintained in a fully extended state, and a biasing force is accumulated to prevent the strip plate 35 from loosening in preparation for the next unwinding.

In the above embodiment, the tension spring 31,
31' and 31'' are interposed to rotate and urge the first drum 26 in the strip winding direction to prevent the strip plate 35 from loosening. , the same effect can be achieved even if it is provided between the second drum 34 and the drum shaft 33,
In addition, the first drum 26 and the second drum 34
If provided on both sides, the loosening prevention effect can be further improved.

(Effects of the Invention) As described above, the automatic belt device of the present invention includes a drive mechanism for reciprocating the belt guide member via a flexible strip, a strip plate of a required length, one end of the strip plate, and the belt. The proximal end of the strip whose tip is fixed to the guide member is fixed to the outer circumferential surface, and these are wound up in a superposed state.
A first drum for rewindably winding the strip; and a first drum disposed on the side of the pull-out path of the strip pulled out from the first drum; a second drum for separating the plate from the strip and winding it; an interlocking mechanism for interlocking each drum shaft of the first drum and the second drum without causing any slippage; an automatic belt device comprising: a drive source connected to at least one drum shaft of two drums and driving the drum shaft in forward and reverse directions;
at least one of the drums and the second drum is rotatably supported relative to each other within a required angular range by a drum shaft of the drum, and
A spring is interposed between the two drums to constantly bias the drum in the direction of winding the strip, and the strip is re-wound from the first drum to the second drum, and the strip is superimposed on the first drum. When extruding the wound strip from the first drum in the longitudinal direction, the spring causes a phase shift between the drum and the drum shaft;
Since it is designed to prevent the band plate from loosening, even when the drum shafts of the first drum and the second drum are interlocked via a non-slip interlocking mechanism such as a gear or a timing belt, This prevents the strips from loosening, allows the strips to slide back and forth smoothly without play or friction with the casing, and prevents breakage due to buckling of the strips or strips inside the drive mechanism casing. It has the excellent effect of preventing damage and greatly improving the durability of the drive mechanism.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing one embodiment of the drive mechanism used in the automatic belt device of the present invention, and FIG.
3 is a perspective view showing an example of the automatic belt device of the present invention, and FIG. 4 is a schematic diagram showing an example of the conventional automatic belt device. 2...Door, 4...Belt, 8...Guide member (guide rail), 9...Belt guide member, 20...
... Drive mechanism, 21 ... Strip, 24, 33 ... Drum shaft, 26 ... First drum, 31, 31', 3
1″...Spring, 34...Second drum, 3
5... Band plate, 41... Interlocking mechanism, 45... Drive source.

Claims (1)

[Scope of utility model registration request] A belt guide member is attached to the tip of a flexible strip that is driven by a drive mechanism in response to the opening and closing of the door,
Automatically sliding the belt guide member back and forth along a guide member provided in the center or side part of the vehicle, and shifting the occupant restraint belt connected to the guide member between a release position and a restraint position. In the belt device, the drive mechanism includes a strip plate of a required length, and one end of the strip plate and the base end of the strip are fixed to the outer periphery;
a first drum for winding and storing the strip and the strip in a mutually overlapping state so that they can be wound and unwound;
a second drum that is disposed on the side of the pull-out path of the strip pulled out from the drum, fixes the other end of the strip to the outer periphery, and separates the strip from the strip and winds it; an interlocking mechanism that interlocks the drum shafts of the first drum and the second drum without causing any slippage; and an interlocking mechanism that is connected to at least one of the drum shafts of the first drum and the second drum. In an automatic belt device configured to include a drive source that drives a shaft in forward and reverse directions, at least one of the first drum and the second drum is moved in a required direction relative to each other by the drum shaft of the drum. An automatic belt device characterized in that the belt is supported on a shaft so as to be relatively rotatable within an angular range, and a spring is interposed between the two for constantly biasing the drum to rotate in the band winding direction.