JPS5910815B2 - Emergency locking device for safety belt winding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides a safety belt retractor for tightening @. Regarding the locking device, in particular, 1@. This safety belt has a tensioner to lock the drawer when a strong pullout force is applied. This invention relates to an O-tsuku device.

This type of emergency locking device may be advantageously used in seats in vehicles, aircraft, etc. that are equipped with safety belts.

In other words, under normal conditions, the safety belt can be freely pulled out or retracted from the safety belt retractor according to the body movements of the person sitting in the seat, but in an emergency, such as an accident, an abnormal load may be applied. When a seated person is hit, the safety belt is locked to prevent the seated person from jumping out of the seat, thereby satisfying both comfort in normal conditions and safety in an emergency.

As an emergency locking device for such a safety belt retractor, a type h structure has been proposed up to now.

In particular, this emergency locking device cannot be very dog-shaped due to limitations imposed by its mounting location.

Therefore, it is preferable that the emergency locking device be realized by simply adding a modest accessory to the configuration of only the safety belt winding device.

This requirement for compactness also means a simple structure.

Furthermore, the simpler the structure, the fewer failures, and therefore the higher the safety.

Furthermore, the simple structure also simplifies the assembly work of the emergency locking device of such a safety belt retractor.

Therefore, the main object of the present invention is to provide an emergency locking device for a safety belt retractor of simple construction which provides the advantages of type h as mentioned above.

In summary, this invention provides a first drive gear to rotate integrally with a reel for winding up a safety belt, a planetary gear to mesh with the first drive gear, and the planetary gear is one of the drive gears. It is movable within a certain range along an arcuate orbit around the planetary gear, and at the end of the movement of this planetary gear, the planetary gear and meshing 5o solenoid teeth are provided on a fixed reel mounting base, thereby causing the safety belt to suddenly move. When pulled out, the planetary gear is moved to a state where it meshes with the lock tooth without rotating, or hardly rotates, and the rotation of the first drive gear, that is, the reel, is prohibited by prohibiting the rotation of the idler gear. On the other hand, by providing a spring that biases the planetary gear away from the ronok south, the planetary gear remains rotatable in the case of regular safety belt withdrawal or winding, thereby and an emergency locking device for the safety belt winding device that allows rotation of the reel.

Other objects and features of the present invention will become more apparent from the detailed description given below with reference to the drawings.

FIG. 1 is a cross-sectional front view of one embodiment of the present invention, and FIG.
The figure is also a cross-sectional right side view.

FIG. 3 is a diagram corresponding to FIG. 2 showing a locked state.

The safety belt 1 is wound onto the reel 2.

A shaft 3 is fixedly attached to the reel 2.

The shaft 3 is rotatably held relative to the reel mount 4.

The reel mount 4 includes means, such as mounting holes 5, for fixing the safety belt retractor in a suitable position.

A return spring 6 is connected to the left end of the shaft 3 in FIG. 1, and is thereby biased so that the reel 2 always rotates in the direction in which the safety belt 1 is wound up.

The return spring 6 is covered by the cover 1.

Further, a spacer 8 is arranged between both ends of the reel 20 and the reel mounting base 4, and a ring 9 is fitted into the shaft 3.
is configured to be always positioned and rotated with respect to the reel mounting base 4.

With the configuration described so far, this safety belt retractor can easily pull out or retract the safety belt 1 according to the body movement of the seated person.

Next, a description will be given of the configuration of the emergency 07 system that operates in the event of an emergency as described above.

At the right end of the shaft 3 in FIG. 1, a drive gear 10 is fixedly provided with respect to the shaft 3.

A planetary gear 11 meshes with the 1 drive gear 10. The structure including the 1 drive gear 10 and the planetary gear 11 includes the cover 1
covered by 2.

The planetary gear 11 is rotated by the rotation of the first drive gear 10, but its shaft 13 is not fixedly provided.

That is, the shaft 13 of the planetary gear 11 is received in long holes 14 and 15 extending in an arc shape and formed in the same shape in the reel mounting base 4 and the cover 12, and the shaft 13 of the planetary gear 11 is received in the arcuate long holes 14 and 15 that are formed in the same shape in the reel mounting base 4 and the cover 12. It is set up so that it can be moved along.

The shape of the elongated holes 14 and 15 is the same as that shown for the elongated hole 14.
This is best shown in Figures 3 and 3.

This elongated hole 14,
Although not shown in the drawings, instead of 15, it is also possible to rotatably provide the shaft 13 at the tip of a link that can rotate around the shaft 3.

The elongated holes 14 and 15 have a constant length dimension,
Therefore, the movement range of the planetary gear 110 along the arcuate trajectory is limited within certain limits.

When the safety belt 1 is pulled out, the safety belt 1 moves in the direction of the arrow 16 in FIG.
rotates in the direction of arrow 1γ.

At the end of movement of the planetary gear 11 in the direction of the arrow 1γ, regardless of whether it is rotated or not,
The lock teeth 18 that mesh with the planetary gear 11 are attached to the reel mounting base 4.
It is fixed to the cover 2, i.e. in this embodiment on the cover 2.

A spring 19 is provided to bias the planetary gear 11 in a direction opposite to the direction of movement of the planetary gear 11 just described, ie in a direction away from the locking teeth 8.

The spring 19 is actually connected between the shaft 13 of the planetary gear 11 and a fixed position of the reel mount 4 or the cover 12.

As shown in FIG. 1, the spring 19 can be placed by advantageously utilizing the gap between the reel 2 and the reel mount 4.

As shown in FIG. 1, the clearance between the planetary gear 11 and the reel mounting base 4 and cover 12 is such that the axis of the planetary gear 11 does not break the parallel opening relationship with the axis of the shaft 3 as much as possible. It is desirable that the design be as narrow as possible so that it can be operated.

In the above configuration, the safety bell shown here
The function and operation of the winding device will be described in relation to the emergency locking device.

First, in a steady state, the safety belt 1 has a return spring 6
It is pulled out in the direction of the arrow 16 with some resistance due to the action of , but when such pulling force is removed, it is wound up on the reel 2 again by the force of the return spring 6 acting on the reel 2.

That is, the safety belt 1 is in a state where it is lightly pulled out or wound up in accordance with the body movements of the seated person.

In this state, the tensile force of the spring 19 is applied to the floating gear 11 via the shaft 13, so the planetary gear 11 maintains a state separated from the lock teeth 18, as shown in FIG. The planetary gear 11 rotates in the direction of arrow 20 in response to the rotation of drive gear 10 in the direction of arrow 1γ, and rotation in the opposite direction is also possible.

Therefore, the idler gear 11 is not locked, the first drive gear 10 can rotate freely, and the safety belt 1 can be freely pulled out or wound up.

Next, the operation in an emergency will be explained.

Suppose now that the safety belt 1 is pulled out in the direction of arrow 16 with rapidly changing acceleration.

In response to this, the drive gear 10 rapidly rotates in the direction of the arrow 11.

This rotation of the first drive gear 10 in the direction of the arrow 1γ should be performed with a sudden change in acceleration.

Therefore, as in the case of the steady state described above, the planetary gear 11
rotation cannot follow this sudden change in acceleration.

In other words, due to the inertia of the planetary gear 11, it tries to maintain its previous state, that is, not rotating or rotating at a low speed, and therefore remains in the position where it meshes with the lock tooth 18 despite the elasticity of the spring 10. will be moved to.

As shown in FIG. 3, when the planetary gear 11 meshes with the interlocking teeth 18, the planetary gear 11 rotates in the direction of the arrow 20 (of course, the same is true in the direction of the eaves). Therefore, the rotation of the drive gear 10 in the direction of the arrow 11 is prohibited, and the withdrawal of the safety belt 1 in the direction of the arrow 16 is accordingly locked.

When the above-mentioned emergency situation is resolved, the safety belt 1 is wound onto the reel 2 by the action of the return spring 6.

In response, drive gear 10 rotates in the direction opposite to arrow 11, allowing the action of spring 19 to return planet gear 11 to the state shown in FIG.

In this way, the steady state is restored.

When considering the direction of movement of the planetary gear 11 in an emergency as described above, for example, an emergency locking device for the safety belt retractor should be provided. By selecting the direction of movement of the planetary gear 11, negative acceleration during braking of the automobile can be used advantageously for locking operation.

However, this is not an essential requirement.

In the embodiment described above, the locking teeth 18 were provided at a position directly facing the direction of movement of the planetary gear 11 in an emergency, but the position of the locking teeth 18 does not necessarily have to be this position. good.

That is, it is sufficient that the candle teeth 18 are provided at a position where they mesh with the planetary gear 11 at the end of the movement of the planetary gear 11 in an emergency.

Other embodiments of the invention demonstrating this will be described below.

FIG. 4 is a sectional right side view showing the main parts of another embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 4 showing a locked state.

In these drawings, parts corresponding to the embodiments described above are given the same reference numerals, and only different structures will be described below.

In an emergency, the five lock teeth 18 meshing with the planetary gear 11,
Rather than directly facing the direction of movement of the planetary gear 11, they are arranged substantially parallel to each other.

That is, the lock teeth 18 should protrude in a direction intersecting the direction of movement of the planetary gear 11.

Since the planetary gear 11 has teeth cut all over its circumference, even if the lock teeth 18 are formed at such a position, in an emergency, the planetary gear 110 will be prohibited from rotating, and accordingly It is possible to prohibit the rotation of

Note that the functions and operations are the same as those of the above-described embodiments, and their explanations will be omitted.

As is clear from the above embodiments, in this emergency locking device, it is important that the locking teeth 18, the planetary gear 11, and the drive gear 10 are reliably engaged.

Therefore, from a material point of view, these components
In addition, from the viewpoint of size and shape, each gear 10, 110
It is desirable that the teeth and lock teeth 18 be selected at the design stage to ensure sufficient strength.

Therefore, for example, it is preferable that the drive gear 10, the planetary gear 11, and the cover 12 be constructed using a steel material with high rigidity.

As described above, according to the present invention, an emergency locking device for a safety belt retractor that operates reliably can be obtained using the planetary gear and the driving gear and candle teeth that mesh with the planetary gear.

Its structure is extremely simple, so it can be compactly added to a safety belt winding device, has fewer failures, and is easy to assemble.

[Brief explanation of drawings]

FIG. 1 is a sectional front view of one embodiment of the present invention. FIG. 2 is also a cross-sectional right side view. FIG. 3 is a diagram corresponding to FIG. 2 showing a locked state. FIG. 4 is a sectional right side view showing the main parts of another embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 4 showing a locked state. In the figure, 1 is a safety belt, 2 is a reel, 3 is a shaft, 4 is a reel mounting base, 6 is a return spring, 10 is a drive gear, 11 is a planet gear, 13 is a shaft of the planet gear, 14 and 15 are oblong holes , 18 are long teeth, and 19 is a spring.

Claims (1)

[Claims] 1. A reel for winding up a safety belt is rotatably held on a fixedly provided reel mounting base by a shaft fixedly provided with respect to the reel, and the reel is An emergency locking device attached to a safety belt winding device that is biased by a spring to rotate in the winding direction of the safety belt, the emergency locking device comprising a first drive gear fixedly provided to the shaft; meshing planetary gears; means for guiding the shaft of the planetary gear along an arcuate trajectory around the first drive gear; means for defining a movement range of the planetary gear along the arcuate trajectory; and the safety belt. a lock tooth that is fixedly provided to the reel mount and meshes with the planet gear at the end when the planet gear moves in the direction in which the first drive gear rotates when being pulled out; An emergency locking device for a safety belt retractor, comprising: a spring that urges a planetary gear in a direction away from the locking teeth.