JPS5943153Y2 - Emergency winding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an emergency winding device that is used in a seat belt system for protecting an occupant in a vehicle emergency and forcibly winds up webbing for restraining an occupant in an emergency.

Seat-held systems are designed to secure occupant safety by restraining occupants with restraint webbing in the event of a vehicle emergency, but if the occupant does not wear the webbing tightly under normal driving conditions, the webbing and occupant If there is a gap between the vehicle and the vehicle, the occupant will be moved a predetermined amount by a trench that eliminates this gap before being restrained by the webbing in the event of a vehicle emergency, and in the event of a secure restraint, the occupant will be moved in the direction of the collision. As a result, the seatbelt system cannot perform its functions to the fullest.

For this reason, in the past, in case of a vehicle emergency, the occupant restraint webbing was forcibly wound up and a predetermined tension was applied to the webbing, so that the occupant was tightly attached to the webbing, and the emergency winding was able to quickly restrain the occupant. A device has been proposed.

In the event of a vehicle emergency, this winding device drives a piston to propel the webbing in the axial direction, converts this thrust into rotational motion, and forcibly winds the webbing onto the winding drum.

However, in this winding device, when the stroke of the piston is large, that is, when a large gap is formed between the occupant restraint webbing and the occupant, the piston moves more than the necessary amount, reducing the propulsive force of the piston. The problem is that it is transmitted to the frame and deforms it.

If the frame is deformed, it becomes impossible to reliably support the winding drum, and the winding drum falls off, making it impossible to support the tension of the webbing, which can lead to a fatal accident for the seat belt system. Become.

The present invention takes the above-mentioned facts into account, and aims to provide an emergency winding device in which the propulsive force of the piston does not damage the various parts of the winding device even when the stroke of the piston is large.

The emergency winding device according to the present invention prevents the propulsive force of the piston from being applied to the frame etc. even when the stroke of the piston is large by providing a propulsive force absorbing member near the stroke end of the piston.

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

Figures 1 to 3 show the first part of the emergency winding device according to the present invention.
An embodiment is shown in which the occupant restraining webbing 10 is wound around a winding drum 14 that is pivotally supported on a frame 12.

There is a total of 1 spring 1 between the winding drum 14 and the frame 12.
6 is interposed to apply a winding force (in the direction of arrow A) to the webbing 10.

Further, a tank plate is provided at an end (not shown) of the webbing 100, so that the occupant can attach the webbing 10 by engaging the tank plate with a buckle device (not shown) when attaching the webbing.

The pressure chamber cover 18 is fastened to the frame 12 and the button is pressed.
A support shaft 20 is fixed coaxially with the winding drum 14 within the pressure chamber cover 18 .

A large pitch screw 22 is cut on the outer periphery of this support shaft 20, into which a screw 25 cut on the inner periphery of the piston 24 is fitted.

Further, a drum 26 is arranged around the screw 22 to support the support shaft 2.
0 and is rotatable around the support shaft 20.

The outer periphery of the piston 24 is fitted into the inner periphery of the drum 26 to create a button, and a groove 28 carved along the axial direction of the inner periphery of the broken drum 26 has a button protruding from the outer periphery of the piston 24. The protrusion 30 is fitted.

Here, the pressure chamber cover 18, piston 24 and drum 26 are installed.
The inner periphery of the pressure chamber 32 forms a pressure chamber 32.
Pressure fluid (for example, pressurized air from explosion of gunpowder) supplied from a supply source (not shown) is fed into the pressure chamber cover 18 from an introduction hole 34 formed in the pressure chamber cover 18 .

Due to this pressure increase in the pressure chamber 32, the piston 24 moves toward the support shaft 2.
However, since the screw 22 of the support shaft 20 and the screw 25 of the heavy stone 24 are fitted, the piston 24 is rotated while moving in the axial direction.

Therefore, the protrusion 30 moves while sliding within the groove 28, thereby causing the drum 26 to rotate.

When the piston 24 moves in the direction of expansion of the pressure chamber 32, it approaches a drum cover 36 which is fastened to the end of the drum 26.

An absorbing member 38 is attached to the inside of this drum cover 36.

This absorbing member 38 has a support shaft 2 formed in an annular shape as a whole.
Although it is coaxial with 0, the cross-sectional shape along the axial direction is a W-shape due to the thin plate being bent multiple times.

Therefore, this absorbing member 38 is configured to plastically deform and absorb kinetic energy when subjected to compressive force in the axial direction.

The direction of rotation of the drum 26 that is rotated when the piston 24 moves in the direction of expansion of the pressure chamber 32 is the same direction as the webbing winding direction of the winding drum 14, and the rotation speed of the drum 26 reaches a predetermined value or more. In this case, the clutch mechanism 40 connects the drum 26 and the winding drum 14.

In this clutch mechanism, a plurality of pawls 42 provided on the drum 26 are activated by a tension coil spring 4 by the rotational driving force of the drum 26.
The drum 26 is connected to the winding drum 14 by expanding outward under the urging force of the winding drum 14 and meshing with a ratchet gear 46 carved on the inner periphery of the winding drum 14. (see figure).

Note that this winding device is equipped with an inertia lock mechanism (not shown) consisting of a ratchet wheel and a bowl for stopping the unwinding rotation of the winding drum 14 in the event of a vehicle emergency.

Next, the operation of the first embodiment will be explained. In the normal state, when the button is pressed, the clutch mechanism 40 separates the winding drum 14 from the drum 26, so the rotation of the winding drum 14 is restricted and the button cannot be pressed. The occupant can unwind and attach the webbing 10 against the biasing force of the full spring 16.

Further, when the button is pressed in a normal vehicle running state, the occupant can unwind the webbing 10 against the biasing force of the spring 16, thereby making it possible to change the driving position.

Next, when the vehicle falls into an emergency situation such as a collision, pressure from a pressure supply source (not shown) is sent to the pressure chamber 32 via the Ha-7'i4 inlet 34.

Due to this pressure increase in the pressure chamber 32, the piston 24 moves toward the support shaft 2.
It receives a propulsive force along the 0 axis direction.

This propulsive force is generated by the piston 2 due to the engagement of the screws 22 and 25.
4, the protrusion 30 of the piston 24 moves while sliding on the groove 28 of the drum 26, and as a result, the drum 26 is rapidly rotated.

When the drum 26 begins to rotate, a clutch mechanism 40 connects the drum 26 and the winding drum 14.

That is, the pawls 42 receive the rotational centrifugal force of the drum 26 and expand outward against the biasing force of the tension coil spring 44, so that they engage with the ratchet gear 46 and transfer the rotational force of the drum 26 to the winding drum 14.
to be communicated to.

As a result, the webbing 10 is forcibly wound up by receiving the rotational force of the piston 24, and an inertia lock mechanism (not shown) prevents the winding drum from unwinding the webbing, thereby eliminating the gap between the occupant and the webbing. This improves safety by tightly restraining the occupants.

If the gap between the webbing 10 and the occupant is large, the piston 24 will move at the axial end of the support shaft 20 and press the absorbing member 38 against the drum cover 36.

Therefore, the absorbing member 38 is plastically deformed in response to the propulsive force of the piston 24 and can absorb the propulsive force of the piston 24, and the piston 24 does not deform the frame 12 etc. due to this propulsive force, thereby avoiding unexpected accidents. can do.

Referring next to FIG. 4.5, a second embodiment of the invention is shown, in which another embodiment of the absorbent member and an alternative method of attaching the absorbent member are shown.

As shown in FIG.
The piston is integrally formed by connecting the pistons, and is adapted to absorb the propulsive force of the piston that is plastically deformed, as in the previous embodiment.

This absorbing member 48 is inserted into the narrow diameter portion 56 of the support shaft 20, and after the washer 58 is inserted into the end thereof, the nut 60 is screwed into the narrow diameter portion 56. It can be installed securely.

Therefore, in this embodiment, it is possible to accurately control the movement stroke of the piston 24.

Next, FIG. 6 shows a third embodiment of the present invention. The absorption member in this embodiment is a small diameter hole 62 provided in the drum 26.

The small diameter hole 62 is located at a predetermined distance from the end of the drum 26, that is, as shown in FIG.
When the drum 26 is moved by the maximum amount of 4, the drum 26 is at a position where the inside of the drum 26 is communicated with the outside air.

Therefore, in this third embodiment, after the piston 24 has moved the maximum amount, the pressure in the drum 26 is released to the outside air, so that the propulsive force is reliably absorbed and the same effects as in the previous embodiments can be obtained. It is possible.

In each of the above embodiments, the piston and the support shaft are screwed together as a mechanism for converting the propulsive force of the piston into rotational motion, and the outer periphery of the piston and the inner periphery of the drum l are connected by a sliding connection. However, the screw connection and the sliding connection can be reversed, and the present invention is not limited to this, and any structure that can appropriately convert the propulsive force of the piston into rotational motion will suffice.

As explained above, the emergency winding device according to the present invention is provided with an absorbing member that absorbs the propulsive force of the piston, so that even if the gap between the webbing and the occupant is large, the propulsive force of the piston deforms the frame etc. It has an excellent effect that does not impair the function of the seat belt system.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing a first embodiment of an emergency winding device according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG.
4 is a partial view showing the cross section of the second embodiment of the present invention, FIG. 5 is a perspective view showing the absorbing member of FIG. 4, and FIG. 6 is the third embodiment of the present invention. It is a sectional view showing an example. 10... Webbing, 12... Frame, 14... Winding drum, 20... Support shaft, 2
2...Screw, 24...Piston, 25
...Screw, 26...Drum, 32...
...Pressure chamber, 38.48...Absorption member, 6
2...Small pore.

Claims (1)

[Scope of utility model registration request] In an emergency winding device for a seat belt system that converts the propulsive force of a piston driven in a vehicle emergency into a rotational motion of a winding drum to forcibly wind an occupant restraining webbing, the piston is propelled toward the vicinity of a stroke end. An emergency winding device characterized by being provided with a force absorbing member.