CN2234888Y

CN2234888Y - Air bag protection device for vehicle

Info

Publication number: CN2234888Y
Application number: CN 95207482
Authority: CN
Inventors: 范良藻; 范思琼
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-13
Filing date: 1995-04-13
Publication date: 1996-09-11
Anticipated expiration: 2005-04-13

Abstract

A gas bag protection device of the utility model discloses a specially designed collision detector, which comprises an impulse transducer and a piezoelectric element. The impulse transducer is provided with a coasting body which is arranged along the vehicle travel direction in a trajectory tube and which can detect the increment of the momentum; when the increment of the momentum exceeds a certain value, the coasting body can disengage the restraint mechanism of the coasting body to make relative motions along the trajectory in the trajectory tube and impact the piezoelectric element which is arranged at the other end of the trajectory tube; the piezoelectric element outputs signals to detonate the gas source. Because the transducer system is separated from the air source and the gas bag, the impulse transducer can be arranged at the most suitable position, having high accuracy; the transducer has no power supply and no preliminary accumulating energy, improving the reliability.

Description

Air bag protecting arrangement for vehicle

The utility model relates to for motor vehicle air bag protecting arrangement, the air bag protecting arrangement that the air bag protecting arrangement of using on the automobile of more specifically saying so, particularly chaufeur are used.

In recent years the development of communications and transportation promotes the increase of highway, especially express highway since, and vehicle increases and speed increases, so the collision case of vehicle also can increase.Prevent that personnel's injures and deaths are earth shaking problems in the accident.Because the speed height, general safety strap can not solve the injures and deaths problem in the high-speed crash.Occurred air bag protecting arrangement since the eighties, promptly in time inflated after the collision, between human body and other objects of Che Nei, formed buffering with airbag to an airbag.Be to activate to open gas source by a crash sensor to inflate in the prior art to airbag.What gas source had produces with the gunpowder detonation, and as Chinese utility model patent 92229131.4 (CN 2138594Y is referring to accompanying drawing 1), gas source also can be used high-pressure gas bottle, as Chinese utility model patent 92223860.1 (CN2138593Y).Crash sensor of the prior art can be divided into two kinds of mechanical pick-up device and electric transducers again.CN 2138594Y moves with coasting body and opens the spring of pretension, and having an effect with spring drives the igniting of striker bump detonating cap.Crossing kind of a sensor can only be set together with gas source, and for example on automotive steering wheel, this is not the position the most responsive to collision.Electric transducer such as Chinese utility model patent 92229132.2 (CN2138595Y is referring to accompanying drawing 2), the negative acceleration that will produce in the time of will colliding with the piezoelectric effect device is converted to voltage signal, to open electronic switch an energy-storage capacitor is discharged by igniter head.CN2138593Y also mentions the therapy of opening an electromagnetic valve with pressure sensor when colliding, and this sensor all is with active circuit, can not work during power fail.What electric transducer was surveyed is acceleration/accel or power, thus because of the transient process of collision complicated inaccurate.Also have, sensor of the prior art all has the energy (mechanical energy of spring and the electric energy of the cond) standby of a pre-storage to discharge, so increased the possibility of misoperation.

The purpose of this utility model is exactly the shortcoming that will overcome above-mentioned prior art, and a kind of sensitivity and air bag protecting arrangement accurately and reliably are provided, and particularly is chaufeur design-calculated air bag protecting arrangement on automobile.

The task of this part utility model is to realize with following technical solution: air bag protecting arrangement is made up of collision detector, gas source and bag module, and wherein collision detector is to be made of impulse sensor and piezoelectric element; Impulse sensor is with an increment along the detection of the coasting body in the trajectory of car sense of motion setting momentum, when the momentum increment surpassed certain value, coasting body broke away from its constraint mechanism and the piezoelectric element that is provided with along the relative motion of trajectory pipe inner trajectory and the bump trajectory pipe other end; The signal of piezoelectric element output is lighted a detonator, in order to ignite gas source.Because collision detector is exported the electric signal method with piezoelectric element, so collision detector can separate with airbag, impulse sensor can be arranged on the vehicle body for the most responsive position of momentum, the just the most suitable sites measured of momentum.Have only lead or cable connection between collision detector and the gas source.Can make coasting body with ferromagnetic material in order to work more reliably, and with the constraint mechanism of magnet as coasting body.Can also be with passive piezoelectric ceramics sensor, the high voltage signal of its output is lighted an electric detonation detonator by an arcing gap.This has just realized the energy freeization of collision detector part.Coasting body has only an in-to-in freedom of motion, and has only coasting body to obtain enough kinetic energy in high-speed motion just may to clash into piezoelectric element and produce electric signal, and this has just eliminated the possibility of misoperation.

Below in conjunction with drawings and Examples the present invention is done detailed explanation.

Fig. 1 is an air bag protecting arrangement scheme drawing of using gunpowder nitrogen gas generator and mechanical pick-up device in the prior art.

Fig. 2 is an air bag protecting arrangement scheme drawing of using gunpowder nitrogen gas generator and electric transducer in the prior art.

Fig. 3 is the scheme drawing of the utility model air bag protecting arrangement for vehicle, and a part is high pressurized gas 2 and airbag 1, and another part is impulse sensor 12 and piezoelectric element, and wherein 4 is electric detonation detonators.

Fig. 4 is the impulse sensor 12 among the embodiment of the present utility model and the structural representation of piezoelectric element.Wherein 13 is piezo ceramic elements; The 14th, the trajectory pipe; The 15th, coasting body (ferromagnetic material); The 16th, constraint mechanism (magnet); The 17th, pad; The 18th, the arcing gap; The 19th, cable junction.The quality of coasting body 15 can be chosen between the 7-200 gram, and its stroke in trajectory pipe 14 is 0.2-4 centimetre.The shape of coasting body 15 is spheroidal in this embodiment.

Select air bag protecting arrangement of the present utility model, its gas source and airbag can separate with crash sensor, so crash sensor can be arranged on only position.What adopt that the sensor of new-type dynamo-electric combination of the present utility model surveys is the momentum that produces in the collision, can judge whether serious collision case exactly, does not have power supply in the detector, does not also have other energy, has improved the reliability of air bag protecting arrangement.The used structure of this improvement is all very simple, and compactness and parts are few, the moderate product so reliable operation can be provided.

Though above embodiment and explanation all are to illustrate with the air bag protecting arrangement on the vehicle steering, the utility model is not limited to the air bag protecting arrangement that automobile driver is used, and also can use aspect the chaufeur of hot-short and occupant's the protection.A those skilled in the art so long as utilized design of the present utility model, will be understood that it is within protection domain of the present utility model in the scheme of having read the various distortion that can design by drawing inferences about other cases from one instance behind the specification sheets.

Claims

1. air bag protecting arrangement for vehicle, by collision detector, gas source, and bag module form, it is characterized in that:

A. said collision detector is to be made of impulse sensor and piezoelectric element;

B. said impulse sensor is with an increment along the detection of the coasting body in the trajectory pipe of car sense of motion setting momentum, when the momentum increment surpassed certain value, coasting body broke away from its constraint mechanism and a piezoelectric element being provided with along the relative motion of trajectory pipe inner trajectory and the bump trajectory pipe other end;

C. light a detonator with the signal of said piezoelectric element output, in order to ignite said gas source.

2. by the described air bag protecting arrangement for vehicle of claim 1, the quality that it is characterized in that said coasting body is the 7-200 gram, stroke 0.2-4 centimetre.

3. by claim 1,2 described air bag protecting arrangement for vehicle, it is characterized in that said coasting body constraint mechanism is a magnet, coasting body is made of ferromagnetic material for this reason.

4. by the described air bag protecting arrangement for vehicle of claim 3, it is characterized in that said piezoelectric element is passive piezoelectric ceramics sensor, the high voltage signal of its output is lighted said detonator by an arcing gap, and said detonator is an electric detonator.

5. by the described air bag protecting arrangement for vehicle of claim 1, it is characterized in that said gas source and bag module are arranged in the automobile steering wheel.