DE19756192C2 - Safety system for erecting or re-erecting a vehicle that is rolling over or lying on the roof - Google Patents

Description

It is known to vehicle occupants by the arrangement of air bags to protect on the vehicle (DE 20 20 360 A). In the event that Airbags are also arranged on the roof. The The lack of this solution is, however, that the vehicle after one Rollover remains on the roof. Thus, the inmates affected difficult to free and the risk of fire from leaking fuel is very high large.

The invention has for its object a security system propose, causing a vehicle lying on the roof again is erected and the shortcomings of the prior art are eliminated.

This object is achieved by the features listed in claim 1 .

The advantages achieved by the invention are in particular that due to the different sized pistons and air bags an unstable position of the vehicle on the roof is reached and thus the vehicle is erected safely. Furthermore, by using the above Components low manufacturing costs and good recyclability guaranteed.

Further advantageous embodiments of the invention are the claims 2 to 9 inclusive.

An embodiment of the security system according to the invention is shown in the drawing and explained in the following description.

It shows:

Tie 1 Installation state of the safety system

Fig. 2 Compilation of the piston-cylinder unit

Fig. 3 How the piston-cylinder unit works

Tie 4 The function of the entire system

Fig. 5 System reaction in the event of a rollover

A pyrotechnic fixed in the vehicle frame Ejection device A, which also includes hybrid ejection device, is used in addition, in the case of a rollover, an unstable Generate position for the vehicle that due to its striving to physical equilibrium itself back to normal drivable position erects. The aforementioned instability can be of two unequal lengths extending pistons and from the air sacs in different sizes are caused. The momentum of the piston comes from the propellant gas created by burning fuel

A hard-wearing and foldable airbag LS with pressure-limited RV valve, which is normally placed in the roof body. The Gas mixture from the ejector passes through the folded air bag the volume change, from its old position and filled the sack up to a certain pressure full. The pressure-limited valve RV protects that Airbag before bursting and prevents gas from flowing back the airbag.

A heavy weight runner G serves as the current bridge for the Circuit when it is in a certain position. As a material The weight rotor can be made of steel or plastic with a coating serve electrically conductive material. To keep the weight within limits part of the runner consist of cavity.

A current storage device K (battery, capacitor, etc.) serves as a current source for the system when the car battery due to the accident of others Safety device such as cable disconnector interrupted or by Rollover is put out of operation.

The power line to the ejector is interrupted in the normal case and is closed when the weight runners roll over to them Interruption reached (falls).

The ejection device has a cylindrical structure in which an elongated cylinder with the shell-shaped upper and lower part represents the combustion chamber. It consists of a cylindrical lower part ( 1 ), a hermetically sealed canister with fuel ( 2 ). This is preferably made of aluminum, copper, cobalt,. , , and manufactured according to the state of the art in the extrusion process or deep drawing process and guarantees absolute tightness against moisture from outside. By using the TS container made of aluminum (copper,...), The requirement for absolute tightness because of the most sensitive fuels is not the primary priority as with the usual gas generators.

According to the invention, an ignition element ( 11 ) is arranged in the cylindrical inner wall of the inner lower part.

The propellant is usually a solid fuel based on sodium azide (NaN ₃ ) and an oxidizer, such as. B. KNO ₃ . Due to the toxicity of sodium azide, sodium azide-free fuels (5-AT or 100% gas-generating propellant such as ammonium nitrate fuel!) Have recently been used. Contrary to the normal field of application of gas generators, only fuel with a high gas yield and lower combustion temperature is used in this system.

The solid propellant can in all described embodiments of the Invention in the form of tablets, pellets, rings or compacts, or have any other form known in the art.

Further components of this invention consist of a screwable combustion chamber tube ( 3 ), an upper part ( 4 ) and a piston ( 13 ) which moves in a radial direction through the upper part with a liner ( 8 ).

The liner is made of soft material (copper, hard plastic, Teflon or Pa, etc. , .) and serves both as a guide and slide bearing.

In the upper part according to the invention there are several movable stop bolts ( 9 ) which, with the cylindrical bushing ( 7 ), enable axial movement (outwards) and reduce the friction between the components to a minimum. These bolts have a cavity (through hole) and move back and forth in the axial direction with the aid of compression springs ( 12 ). The number of bolts serves as a firm basis for the opened piston.

When the piston moves upward, it pushes the bolts axially Move directions (outwards) when he pushes past their position these bolts return to the old position using the compression springs.

The bolts according to the invention are fixed. They prevent at the same time the backward movement of the piston and direct the propellant gas to the air bag.

The screw-on cap serves as a stop for the compression spring and as a connection ( 6 ) to the heavy-duty airbag LS on the pressure-limited check valve RV, which is protected against bag damage. This check valve also prevents the gas from escaping from the sack at the end of the generator burning time or container opening time.

A protective cap ( 10 ) serves against the environmental influence and closes the opening.

The piston according to the invention also serves as a carrier for the gas container ( 15 ), the opening membrane of which lies on a pointed object ( 16 ). The frictional connection between the pressure vessel and the piston is held down by the slide ring ( 14 ). In addition to the gas in the container, a certain liquid can also be used for cooling or gas generation as required. The slide ring keeps the friction between the piston plate and the combustion chamber inner wall to a minimum. The piston moves almost freely in the combustion chamber.

The components of the exhaust device (lower part, combustion chamber tube, Upper part, piston, etc.) consist of a structured material, eg. B. Light metal titanium, or other metallic or non-metallic substances, like plastic, cast, sponged with honeycomb structure or other Structure with cavities closed to the outside, with and without Fiber reinforcement or be provided with inner or outer ribs and are especially in the injection molding, die casting or extrusion process manufactured.

Contrary to the conventional gas generators, the need of Filter materials (sieve, braid, knitted mesh, etc. ...) with this ejection device registered does not exist. The environmental impact is  thereby less → easier recycling (few parts, none Use of metal fiber or ceramic fleece!).

The ejection device works as follows: - Fig. 3 -

Gas generators contain a propellant charge which is introduced into a combustion chamber and which, after an electrical pulse has been triggered by a sensor as a result of an accident, is ignited by means of an ignition device integrated in the generator. The internal pressure of the generator is <0.5 bar (pressureless!) Before commissioning. The ignition devices ignite the fuel in the combustion chambers when the room is closed and the pressure rises sharply. If a combustion chamber pressure of <200 bar is reached, at which the surface of the fuel is already burning completely, the piston ( 13 ) is shot up to the stop of the upper part. When driving past, it first displaces the bolts ( 9 ) outwards, which are pushed back inwards by means of the compression springs ( 12 ) when the piston continues to move, thereby preventing the piston from returning.

The piston stops moving when the piston touches the Inner surface of the upper part reached.

The gas container ( 15 ) according to the invention is displaced by the strong force towards the pointed opener ( 16 ) and the specific (defined) location of the gas container is thus broken. The content of the gas container (combustible, non-combustible gas or liquid) flows out of the gas container and mixes with the hot propellant gas, cools the propellant gas temperature within a tolerable limit and increases the gas volume (if necessary!) Before the mixture passes through the outflow bores of the Bolt reaches and finally reaches the hard-wearing sack through the pressure valve.

The erection system works as follows: - Fig. 4 -

If the means of transportation overturns, the runner G falls down due to the weight - FIG. 5 - and the interruption is short-circuited, ie the current pulse from the current store K activates the ignition unit of the ejection device A and thereby ignites the igniter, which in turn generates hot particles, which then hit the surface of a fuel, usually in tablet form. This then ignites automatically and burns in the so-called fuel container under high pressure. The resulting propellant gas first bursts the TS container and builds up a certain pressure in the combustion chamber. When the combustion chamber pressure reaches a certain pressure, the propellant pushes the piston out of its position up to the stop of the upper part, blows through the bolts and pressure-limited valve and fills the bag.

The propellant gas cannot get into the airbag at the beginning because the Path to the pressure-limited valve is not yet clear. It is only free when the Piston drives past the bolts and reaches the stop of the upper part.

By introducing two systems into the B-pillar (one is and other on the passenger side) of the means of transportation and with Pistons in different lengths, air bags in two sizes (especially in the combination of shorter pistons with a large sack and of longer piston with a small sack) the position of the flipped over Vehicle unstable due to the inflated air bags. The vehicle turns due to the unstable shift of his focus back to the normal location around.

Claims (9)

1. Safety system for erecting or re-erecting a rollover or vehicle lying on the roof, characterized in that a piston-cylinder unit and an airbag are arranged together on each side of the vehicle roof, the pistons being of different lengths and the airbags being of different sizes , so that they generate an unstable position of the vehicle in the triggered state, which cause the vehicle to stand up or turn over. 2. Safety system according to claim 1, characterized in that the piston-cylinder unit has a combustion chamber, which consists of a lower part ( 1 ), a screwable combustion chamber tube ( 3 ) and an upper part ( 4 ), and a piston ( 13 ), wherein the piston moves linearly upwards to the upper part through a propellant gas in the combustion chamber tube and is held in place by radially movable bushings ( 8 ) and a sliding ring ( 14 ) at the piston end reduces the friction between the piston and the combustion chamber inner wall to a minimum value. 3. Safety system according to one of claims 1 to 2, characterized in that a filled container ( 15 ) is arranged above the lower piston part, which is transported by linear movement of the piston directly to the upper housing part ( 4 ) and bursts there on impact with the upper part , wherein the medium flows from the container through openings on the lower piston part, which consist of movable tongues that prevent backflow, into the combustion chamber tube and mixes there with hot propellant gas. 4. Safety system according to one of claims 1 to 3, characterized in that the combustion chamber tube ( 3 ) has cavities which serve to receive bolts ( 9 ) which prevent the piston ( 13 ) from moving back by providing a fixed one for the piston Form the basis for support. 5. Security system according to claim 4, characterized in that the number of bolts in the combustion chamber on the circumference is evenly distributed. 6. Security system according to one of claims 4 to 5, characterized in that a compression spring ( 12 ) and a closure cap ( 6 ) allow the movement of the bolts in the axial direction. 7. Safety system according to one of claims 4 to 6, characterized in that the bolts ( 9 ) in the combustion chamber have an oblique chamfer to the running direction of the piston, whereby the pushing in of the bolts in the radial direction is facilitated, so that the piston is in the Combustion chamber can move freely to the end position. 8. Safety system according to one of claims 1 to 7, characterized in that the bolts ( 9 ) have through holes through which the propellant gas passes through a check valve in the durable airbag, which can thus be kept stable over a longer period. 9. Security system according to one of the preceding claims, characterized in that for the ignition of the solid fuel an emergency power supply, by means of a weight runner (G) and a power store (K) is provided.