阅读说明：本技术 气体发生器 (Gas generator ) 是由 福本健二 于 2018-03-13 设计创作，主要内容包括：本发明提供一种气体发生器,其在筒状壳体的第1端部侧具有具备点火器的点火室,在第2端部侧具有具备气体排出口的扩散部,在它们之间具有燃烧室,可发生局部开裂的封闭构件将所述点火室与所述燃烧室之间分隔,所述封闭构件因所述点火室内的压力升高而发生局部开裂,在所述燃烧室内配置有从所述筒状壳体的第1端部的一侧向所述第2端部延伸的内管,在所述内管的周围的空间内容纳有所述气体发生剂成型体,所述内管是中空的,所述点火室侧的第1端部的开口部抵接于所述封闭构件的可开裂部分,封闭的第2端部向所述扩散部方向延伸,在周壁部具有多个贯穿孔,最小内径(Dmin)大于所述传火药成型体的最大长度(Lmax),所述中空部为所述封闭构件开裂时所述传火药成型体移动至所述第2端部为止的空间。(The present invention provides a kind of gas generator, its igniting chamber for having igniter in the 1st end side of tubular shell, has the diffusion part of gas discharge outlet in the 2nd end side, there is combustion chamber between them, the closure member that Local Cracking can occur will separate between the igniting chamber and the combustion chamber, because of the igniting indoor pressure rise Local Cracking occurs for the closure member, configured with the inner tube extended from a side of the 1st end of the tubular shell to the 2nd end in the combustion chamber, space content around said inner tube, which is received, the gas-forming agent formed body, said inner tube is hollow, the opening portion of 1st end of the igniting chamber side is connected to the part of cracking of the closure member, closed 2nd end extends to the diffusion part direction, there are multiple through holes in peripheral wall portion , minimum diameter (Dmin) is greater than the maximum length (Lmax) of the starting mix formed body, and the hollow portion is the space until the starting mix formed body is moved to the 2nd end when closure member cracks.)

1. gas generator has the igniting chamber of igniter in the 1st end side of tubular shell, in the tubular shell The 2nd end side of axially opposite side have the diffusion part of gas discharge outlet, the igniting chamber and the diffusion part it Between have and accommodate the combustion chamber of gas-forming agent formed body, part can be occurred between the igniting chamber and the combustion chamber and opened The closure member split separates,

Starting mix formed body is accommodated in the igniting chamber, the closure member that Local Cracking occurs is because of the igniting Indoor pressure rise and the component to crack,

The combustion chamber is connected to the diffusion part,

The inner tube extended from a side of the 1st end of the tubular shell to the 2nd end is configured in the combustion chamber, Space content around said inner tube, which is received, the gas-forming agent formed body,

Said inner tube is the 1st open-ended, axially opposite side the 2nd end-enclosed of the igniting chamber side and has in peripheral wall portion There is the hollow inner tube of multiple through holes,

The opening portion of 1st end is connected to the part of cracking of the closure member, and closed 2nd end is to described Diffusion part direction extends,

The minimum diameter (Dmin) of said inner tube is greater than the maximum length (Lmax) of the starting mix formed body,

The hollow portion is the sky until the starting mix formed body is moved to the 2nd end when closure member cracks Between.

2. gas generator according to claim 1, wherein

The starting mix formed body accommodated in the igniting chamber is granular formed body, the maximum length (Lmax) of the granular formed body The range for being 0.1~0.6 with the ratio between the minimum diameter (Dmin) of said inner tube (Lmax/Dmin).

3. gas generator according to claim 1 or 2, wherein

Multiple through holes of the peripheral wall portion of said inner tube are formed in from the 1st end towards the 2nd end side, per unit face The opening area of long-pending through hole increases,

The opening diameter of the through hole is less than the minimum length part of the gas-forming agent formed body accommodated in the combustion chamber.

4. gas generator described in any one of claim 1 to 3, wherein

The ratio between internal diameter (D) of the maximum outside diameter (Dmax) of said inner tube relative to the tubular shell (Dmax/D) be 0.15~ 0.50。

5. gas generator according to any one of claims 1 to 4, wherein

The diffusion part includes the combination of the 1st glass of component and the 2nd glass of component, and the 1st glass of component has the 1st bottom surface sections, formed Have the 1st peripheral wall portion and the 1st opening portion of multiple gas discharge outlets, the 2nd glass of component have the 2nd bottom surface sections, be formed with it is multiple 2nd peripheral wall portion and 2nd opening portion of the gas by mouth,

The 1st glass of component and the 2nd glass of component are by making the 2nd opening portion side of the 2nd glass of component be embedded in described 1st glass In 1st opening portion of component and abuts the medial surface of the 1st peripheral wall portion with the lateral surface of the 2nd peripheral wall portion and combines,

1st glass of component of the diffusion part supports the 1st peripheral wall portion of the 1st opening portion side of the not formed gas discharge outlet The inner peripheral wall near the opening portion of the 2nd end of the tubular shell is connect and is embedded in,

2nd bottom surface sections of the 2nd glass of component are opposite with the igniting chamber, the 2nd peripheral wall portion of the 2nd glass of component with institute The mode for stating formation annular gap between the inner peripheral wall of tubular shell configures,

It is closed by the 2nd bottom surface sections of the 2nd glass of component 2nd end of said inner tube.

6. the ignition method of gas-forming agent formed body, be gas generator described in claim 1 combustion chamber in accommodate Gas-forming agent formed body ignition method, this method comprises:

Stage 1 makes the igniter work and the indoor starting mix ignition burning that makes to light a fire, and thus makes the indoor pressure of igniting Power increases；

Stage 2 makes the part of cracking of the closure member crack because of the indoor pressure rise of the igniting, thus makes The igniting chamber is connected to said inner tube；

Stage 3 sprays the starting mix formed body of the indoor combustion state of the igniting into said inner tube, and to closed the 2 end sides are mobile；

Stage 4 sprays the combustion product discharged by the starting mix formed body of the sustained combustion in said inner tube from the through hole Out, make the indoor gas-forming agent formed body of burning be under fire to burn.

Technical field

The present invention relates to the gas generators for the airbag apparatus purposes that may be used as carrying in automobile.

Background technique

In the airbag apparatus of the side collision of automobile, due to the limitation of installation section, the gas of elongated shape has been used Body generator.For for the gas generator of such elongated shape the case where, mostly at one end side be under fire and by gas from The structure of another side discharge, in the case where such gas discharge mode, it is important to be able to successfully implement gas hair The burning of raw agent and the discharge of gas.

One kind is disclosed in JPH05-92747A, and side has igniter (igniter) 7 and in container (shell) 1 at one end Peripheral wall portion is formed with the air bag of gas tap hole (gas discharge outlet) 2 with air charging system (inflator).

In the inside (combustion chamber 3) of shell 1, be arranged in the axial direction with multiple gas-forming agent formed bodys 5, gas-forming agent at Type body 5 is the shape that center portion has run through.Therefore, in the state that multiple gas-forming agent formed bodys 5 are axially aligned, meeting Be formed as the state that hole is formed through from the one end of shell to another side.Have side by side with combustion chamber 3 filled with combustion The part of burning property substance pellet 6, the part and combustion chamber 3 are divided by sealing element 14.Combustion chamber 3 and external filter 10 Between form and be formed with the cylindrical member of gas vent 4 in peripheral wall portion.

In JP2003-002153A, there is igniter 23 in the one end for the tubular shell 1 that both ends are closed, another The peripheral wall portion of side forms gas discharge hole 8.

At work, igniter 23 works, and the 1st, which passes fiery agent 22, burns, and in turn, the in the fiery device 3 of biography the 2nd, which passes fiery agent 18, fires It burns, discharges flame etc. into hollow space 17 from fire-fighting mouth 28 is passed.Flame in hollow space 17 etc. is disposed to from inner cylinder material The gas through hole 15 of material 5 enters inside, so that gas-forming agent 4 is under fire and burns and generate high-temperature gas.High-temperature gas is from gas Through hole 15 enters in hollow space 17, after destroying explosion plate 14, into filter chamber 12, passes through in filter material 10 Afterwards, it is discharged from gas discharge hole 8.

Summary of the invention

The present invention provides a kind of gas generator, has the igniting of igniter in the 1st end side of tubular shell Room has the diffusion part of gas discharge outlet in the 2nd end side of the axially opposite side of the tubular shell, in the igniting Have between room and the diffusion part and accommodate the combustion chamber of gas-forming agent formed body, the igniting chamber and the combustion chamber it Between separated by the closure member that can be occurred Local Cracking,

Starting mix formed body is accommodated in the igniting chamber, the closure member that Local Cracking occurs is because described in The component lighting a fire indoor pressure rise and cracking,

The combustion chamber is connected to the diffusion part,

Configured with extending to the 2nd end from a side of the 1st end of the tubular shell in the combustion chamber Inner tube (inner tube), the space content around said inner tube, which is received, the gas-forming agent formed body,

Said inner tube is the 1st open-ended, axially opposite side the 2nd end-enclosed of the igniting chamber side and in peripheral wall Portion has the hollow inner tube of multiple through holes,

The opening portion of 1st end is connected to the part of cracking of the closure member, closed 2nd end to The diffusion part direction extends,

The minimum diameter (Dmin) of said inner tube is greater than the maximum length (Lmax) of the starting mix formed body,

The hollow portion is until the starting mix formed body is moved to the 2nd end when closure member cracks Space.

In addition, the present invention provides a kind of ignition method of gas-forming agent formed body, it is in the gas generator The ignition method of the gas-forming agent formed body accommodated in combustion chamber, this method comprises:

Stage 1 makes the igniter work and the indoor starting mix ignition burning that makes to light a fire, thus makes in the igniting chamber Pressure rise；

Stage 2 makes the part of cracking of the closure member crack because of the indoor pressure rise of the igniting, by This is connected to the igniting chamber with said inner tube；

Stage 3 sprays the starting mix formed body of the indoor combustion state of the igniting into said inner tube, and to closing The 2nd end side it is mobile；

Stage 4 runs through the combustion product discharged by the starting mix formed body of the sustained combustion in said inner tube from described Hole sprays, and so that the indoor gas-forming agent formed body of burning is under fire and burns.

Detailed description of the invention

The present invention can be more fully understood by detailed description and accompanying drawings below, but it is merely to illustrate, it is not right The present invention limits.

Fig. 1 is the sectional view of the X-direction of gas generator of the invention.

Fig. 2 is the partial enlarged view of Fig. 1.

Fig. 3 is the top view of the closure member of Fig. 1.

Fig. 4 is the enlarged fragmentary cross section of the embodiment different from Fig. 1.

Fig. 5 is the enlarged fragmentary cross section of another embodiment different from Fig. 1.

Specific embodiment

The present invention provides a kind of gas generator, despite accommodated in elongated tubular shell gas-forming agent at The gas generator of type body, but the efflux time of burning gases can be shortened, the expansion start time of air bag can be shortened.

Tubular shell is made of metals such as iron, stainless steels, and section is circle.Section is not limited to circle.

Tubular shell is the 1st end and the 2nd open-ended shell, and the 1st end side is closed because installing igniter, the 2 end sides are closed because installing diffusion part.

Tubular shell, which can be used, makes shell made of the opening portion closing of either end, In for example, by deep-draw processing method Above-mentioned closing end side can form gas discharge outlet and diffusion part is made.

Igniting chamber has well known ignition and starting mix formed body.

Igniter is installed on the opening portion side of the 1st end of tubular shell.Starting mix formed body is in addition to well known starting mix It, can also be used as the gas-forming agent formed body that starting mix functions other than formed body.

The closure member that Local Cracking occurs that igniting chamber and combustion chamber are separated is the plate made of iron, stainless steel Component or be the component with the box-like of bottom surface and side.

The closure member that Local Cracking can occur is the component that Local Cracking can occur because lighting a fire indoor pressure rise. The closure member that Local Cracking can occur, which can be used, forms+notch of shape etc., Circular Thin portion in the part for wanting cracking Etc. frangible portions component.Cracking part in closure member is the 1st end of inner space towards aftermentioned inner tube, i.e. inner tube The part of the opening portion in portion.

Gas-forming agent formed body is accommodated in the cylindrical space other than inner tube in the combustion chamber.Combustion chamber content The gas-forming agent formed body received can be used and the gas used in the well known gas generator for expanding air bag The identical gas-forming agent of propellant.

Diffusion part has gas discharge outlet, is preferably made of material identical with tubular shell.

As long as there is diffusion part the gas of gas discharge outlet and connection combustion chamber and the inner space of diffusion part to pass through mouth , shape and structure are not particularly limited.It can be used for example, by peripheral wall portion there is gas discharge outlet and opening portion to be Diffusion part that gas is made up of a cup component of mouth, by peripheral wall portion there is gas to pass through the multiple of mouth and gas discharge outlet The diffusion part that the combination of cup component is constituted.

Make the communication port (gas passes through mouth) of diffusion part and combustion chamber can be formed along the axial direction of tubular shell with The opposite position of igniting chamber, or be formed on the direction orthogonal with the axial direction of tubular shell, the inner peripheral wall with tubular shell Interval and opposite position.

Inner tube is made of metals such as iron, stainless steels, is to have to pass through the combustion products such as flame, high-temperature gas in peripheral wall portion Through hole hollow inner tube.

It is each non-constant but have diameter not that internal diameter and the uniform inner tube of outer diameter, internal diameter and outer diameter can be made in inner tube With part inner tube (for example, the opening portion of the 1st end and big inner tube of internal diameter near it), internal diameter and outer diameter from the 1st end The inner tube etc. that the inner tube or internal diameter and outer diameter that portion to the 2nd end stage reduces are continuously reduced from the 1st end to the 2nd end.

The through hole of inner tube is preferably multiple from the 1st end to being dispersedly formed between the 2nd end.

The position of 2nd end of inner tube is preferably the interposition than playing the length (L) between diffusion part from closure member (0.5L) is set closer to diffusion part side, i.e. close to the position of diffusion part, more preferably than the 0.7L from closure member closer to Diffusion part side, further preferably than 0.8L closer to diffusion part side.

The state that 1st end side of inner tube is connected to the part of cracking of above-mentioned closure member preferably with opening portion is consolidated Fixed, the opening portion of more preferable 1st end encloses the part of cracking of above-mentioned closure member.

The fixing means of inner tube is not particularly limited, and can be used such as under type: with the 1st end abutment in closure member, 2nd end abutment is in the fixed mode of state of diffusion part；1st end is embedded into the intracorporal cricoid fixing component of cylindrical case It surrounds and fixed mode；(protrusion top is can cracking unit for protrusion possessed by the opening portion insertion rupture member of 1st end Point) and fixed mode；The opening portion of 2nd end of inner tube is embedded in the protrusion for being formed in diffusion part and the mode being closed Deng.

The minimum diameter (Dmin) of inner tube is greater than the maximum length (Lmax) of starting mix formed body.For in the minimum of inner tube It is minimum diameter in the internal diameter unevenness of inner tube for diameter (Dmin), is for the moment above-mentioned uniform internal diameter in the internal diameter of inner tube.

For the maximum length (Lmax) of starting mix formed body, starting mix formed body be ball when be diameter, for It is long axis length when elliptical shape ball, is length when for cylinder, be diameter when for plate-like, (partially occurs for irregular shape The spherical shape etc. of deformation) when be longest part length.That is, refer to the diameter of every 1 starting mix formed body, long axis length, And length the best part in side length.

The opening portion of 1st end side of inner tube is connected to the part of cracking of closure member, therefore, at work, closing When the part of cracking of component cracks, is open because lighting a fire indoor pressure rise, igniting chamber becomes to be connected to inner tube.It is closing In component, it will not crack in addition to the part that can crack.

In this way, at the time of indoor pressure of lighting a fire sufficiently increases, when closure member cracks and is connected to, due to meeting The relationship of above-mentioned Dmin > Lmax, therefore, in igniting chamber, the starting mix formed body of combustion state is from the 1st end of inner tube Opening portion internally spray, by mobile to the 2nd end side of inner tube after hollow portion.At this point, the biography of mobile combustion state In the 1st end from inner tube between the 2nd end, the tamped density of the 2nd end side increases the tamped density of gunpowder formed body, the The tamped density of 1 end side reduces.

Then, the high-temperature gas discharged by the starting mix formed body of combustion state is from the through hole flowing in combustion chamber of inner tube Interior, gas-forming agent formed body, which is under fire, as a result, burns.At this point, the tamped density of the starting mix formed body of combustion state it is high, with connect The gas-forming agent formed body that 2nd end side of the inner tube of nearly diffusion part connects is easy burning, therefore, from the work of igniter It becomes faster to the time that burning gases are discharged by gas discharge outlet.It therefore, can also although having used the tubular shell of elongated shape Discharge is (from the gas of gas discharge outlet forming gas caused by volumetric combustion to gas-forming agent since igniter work with shortening Body starts to be discharged) time.

In the preferred embodiment of gas generator of the invention, it is contained in the indoor starting mix formed body of above-mentioned igniting For granular formed body.In addition, for starting mix formed body, in this case, the maximum length (Lmax) of granular formed body It is preferably 0.1~0.6 range with the ratio between the minimum diameter (Dmin) of above-mentioned inner tube (Lmax/Dmin).

When Lmax/Dmin=0.1~0.6, at work, the starting mix formed body of combustion state is easy in inner tube to 2 end sides are mobile, can shorten the time until being discharged since gas is played in igniter work, therefore preferably.

In the preferred embodiment of gas generator of the invention, it is formed in the multiple of the peripheral wall portion of above-mentioned inner tube and runs through From above-mentioned 1st end towards above-mentioned 2nd end side, the opening area of the through hole of per unit area increases in hole,

The opening diameter of above-mentioned through hole is less than the minimum length of the gas-forming agent formed body accommodated in above-mentioned combustion chamber Part.

Minimum length part refers to the smallest portion of length in diameter, long axis length and the side length of every 1 gas-forming agent Point.

The opening of through hole as multiple through holes from above-mentioned 1st end towards above-mentioned 2nd end side per unit area The form that area increases, there is following form:

When the opening diameter of through hole is all identical, the increased amount of form of the through hole of per unit area；

In the opening diameter of through hole different and through hole quantity from the 1st end to the 2nd end be equal densities when, The form etc. that opening diameter from the 1st end to above-mentioned 2nd end side through hole periodically or continuously increases.

Multiple through holes are from above-mentioned 1st end towards above-mentioned 2nd end side, the opening area of the through hole of per unit area When increase, the gas-forming agent formed body to connect with the 2nd end side of the inner tube close to diffusion part is readily burned, therefore, from gas Time required for the discharge of the burning gases of body outlet becomes faster, therefore can shorten since gas is played in igniter work Time until discharge, therefore preferably.

The preferred embodiment of gas generator of the invention is: the maximum outside diameter (Dmax) of above-mentioned inner tube is relative to above-mentioned The ratio between the internal diameter (D) of tubular shell (Dmax/D) is 0.15~0.50.

It in Dmax/D=0.15~0.50, can not only ensure the volume of combustion chamber, the burning in inner tube can also be made The movement of the starting mix formed body of state becomes easy.

In the preferred embodiment of gas generator of the invention, above-mentioned diffusion part includes the 1st glass of component and the 2nd glass of structure The combination of part, the 1st peripheral wall portion and the 1st opening that the 1st glass of component has the 1st bottom surface sections, is formed with multiple gas discharge outlets Portion, the 2nd glass of component have the 2nd bottom surface sections, are formed with 2nd peripheral wall portion and 2nd opening portion of multiple gases by mouth,

Above-mentioned 1st glass of component and above-mentioned 2nd glass of component are above-mentioned by being embedded in the 2nd opening portion side of above-mentioned 2nd glass of component In 1st opening portion of the 1st glass of component and the medial surface of the 1st peripheral wall portion is made to abut and be combined one with the lateral surface of the 2nd peripheral wall portion It rises,

1st glass of component of above-mentioned diffusion part makes the 1st peripheral wall of above-mentioned 1st opening portion side of not formed above-mentioned gas outlet Portion abuts and is embedded in the inner peripheral wall near the opening portion of the 2nd end of above-mentioned tubular shell,

2nd bottom surface sections of above-mentioned 2nd glass of component are opposite with above-mentioned igniting chamber, the 2nd peripheral wall portion of above-mentioned 2nd glass of component with The mode that annular gap is formed between the inner peripheral wall of above-mentioned tubular shell configures,

It is closed by the 2nd bottom surface sections of above-mentioned 2nd glass of component 2nd end of above-mentioned inner tube.

The 1st glass of component and the 2nd glass of component that the diffusion part of above embodiment is combined with each other by mutual opening portion are formed.

Due to foring multiple gas discharge outlets in the 1st peripheral wall portion of the 1st glass of component, multiple gas discharge outlet shapes On the orthogonal direction of the axial direction of Cheng Yu tubular shell.Pass through due to foring multiple gases in the 2nd peripheral wall portion of the 2nd glass of component Mouthful, therefore, multiple gases are formed in the internal perisporium on the direction orthogonal with the axial direction of tubular shell and with tubular shell by mouth Face interval and opposite position.

The 2nd end (opening portion of the 2nd end) of inner tube is closed by the 2nd bottom surface sections of the 2nd glass of component, in addition to forming the The opening portion of 2 ends is connected to other than the form of the 2nd bottom surface sections, and the opening portion insertion that can also form the 2nd end is formed in the 2nd The opening portion insertion of the protrusions of bottom surface sections and closed form, the 2nd end is formed in the form of the circular trough of the 2nd bottom surface sections.

In ignition method of the invention, as described in stage 1 and stage 2, component institute is closed between igniting chamber and inner tube Separate, therefore, at the time of the pressure of igniting chamber sufficiently increases, closure member can be made to crack, thus by igniting chamber with it is interior Connection inside pipe.

Then, as described in the stage 3, the starting mix formed body for indoor combustion state of lighting a fire flows into inner tube fiercely, to The mobile amount of the 2nd end side being closed in inner tube increases.Therefore, the gas to connect with the 2nd end of the inner tube close to diffusion part Body propellant formed body is easy burning, therefore, burning gases is generated early stage work, is discharged from gas discharge outlet, therefore, from The time that igniter work plays until gas starts to be discharged shortens.

Gas generator of the invention may be used as the airbag apparatus gas generator carried in automobile, especially can be with The gas generator of the short air sac device for lateral collision in interval as passenger and vehicle body.

Gas generator of the invention has used the tubular shell of elongated shape, but can shorten and play from igniter work Gas starts the time until discharge, therefore can accelerate the expansion start time of air bag.

Detailed description of the invention

< gas generator >

(1) gas generator of Fig. 1, Fig. 2

Opening portion side of the gas generator 1 in the 1st end 10a of tubular shell 10 has igniting chamber 20, in tubular shell The opening portion side of 2nd end 10b of 10 axially opposite side has diffusion part 40.In addition, gas generator 1 is in tubular shell 10 Igniting chamber 20 and diffusion part 40 between have combustion chamber 30.

Igniter 21 is installed in the opening portion of the 1st end 10a of tubular shell 10, above-mentioned opening portion is ignited 21 institute of device Closing.Igniter 21 is the lighter body comprising ignition portion 22 and metal igniter washer 23 through not shown resin Component made of integration occurs.

O-ring 24 is configured between the inner peripheral wall 11 and igniter washer 23 of tubular shell 10, in ignition portion 22 Surrounding is configured with guiding elements 25, guiding 29 side of closure member such as flame that the guiding elements 25 is used to generate when will work To.

Granular starting mix formed body 26 is accommodated in igniting chamber 20.Starting mix formed body 26 has spherical or similar with its Shape, be also possible to cylindrical shape.

Separated between igniting chamber 20 and combustion chamber 30 by the closure member 29 with bottom surface sections 29a and side surface part 29b.Envelope It closes component 29 to be pressed into tubular shell 10, and the starting mix formed body 26 being accommodated in igniting chamber 20 is supported.

The opening portion side of 2nd end 10b of tubular shell 10 is equipped with to be formed by the 1st glass of component 41 and the 2nd glass of component 51 Diffusion part 40.

The 1st peripheral wall portion 44 and the 1st that 1st glass of component 41 have the 1st bottom surface sections 42, forms gas discharge outlet 43 is opened Oral area 45.In the 1st ring that 45 side of the 1st opening portion has the 1st flange part 46 and stretches out from the 1st flange part 46 to vertical direction Shape wall portion 47.The 2nd peripheral wall portion 54 and the 2nd opening that 2nd glass of component 51 has the 2nd bottom surface sections 52, forms gas by mouth 53 Portion 55.There is the 2nd short flange part 56 in 55 side of the 2nd opening portion.

Gas discharge outlet 43 and gas are pasted with band (not shown) from inside by any one of mouth 53.

1st glass of component 41 and the 2nd glass of component 51 are by making 55 side of the 2nd opening portion of the 2nd glass of component 51 be embedded in the 1st glass of component In 41 the 1st opening portion 45 and abuts the medial surface of the 1st annular wall 47 with the 2nd flange part 56 and combine.

1st glass of component 41 is so that the 1st flange part 46 and the 1st annular wall 47 abut and be embedded in the 2nd of tubular shell 10 The state of inner peripheral wall 11 near the opening portion of end 10b have passed through welding.In addition, the 2nd bottom surface sections 52 of the 2nd glass of component 51 Towards in combustion chamber 30, the 2nd peripheral wall portion 54 of the 2nd glass of component 51 is to form ring between the inner peripheral wall 11 of tubular shell 10 The mode in shape gap 57 configures.

In combustion chamber 30 be configured with hollow inner tube 31, accommodated in the surrounding space of inner tube 31 gas-forming agent at Type body 33.The internal diameter and outer diameter of inner tube 31 are uniform.

The ratio between the outer diameter (Dmax) of inner tube 31 and the internal diameter (D) of tubular shell 10 (Dmax/D) are about 0.35, it is ensured that are used Space in the gas-forming agent formed body 33 for accommodating requirement and space for configuring inner tube 31.

Combustion chamber 30 is directly connected to by the gas of the 2nd glass of component 51 by mouth 53 with diffusion part 40.

For inner tube 31, the opening portion of the 1st end 31a of 20 side of igniting chamber is connected to closure member 29, axial opposed The opening portion of 2nd end 31b of side is sealed by being embedded in the protrusion 52a for the 2nd bottom surface sections 52 for being formed in the 2nd glass of component 51 It closes.

1st end 31a of inner tube 31 by be embedded in the hole for abutting with closure member 29 annular component 28 configured by It is fixed.

Annular component 28 is supported by the inner peripheral wall 11 that outer peripheral surface is connected to tubular shell 10 from radial direction, is led to The multiple inside protrusions portions 12 for crossing the inner peripheral wall 11 for being formed in tubular shell 10 are abutted with closure member 29, thus from X-axis side To two sides be supported.

The opening portion of 1st end 31a of inner tube 31 with surround form closure member 29+shape notch 29d it is circular The mode of part 29c (Fig. 3) of can cracking abuts.

Inner tube 31 is at the axially spaced interval of peripheral wall portion and all identical is opened with equally spaced form in a circumferential direction Multiple through holes 32 of mouth diameter.Multiple through holes 32 of inner tube 31 are counted with from the 1st end 31a towards the 2nd end side 31b Amount increases, and the opening area stage of the through hole 32 of per unit area increases as a result,.

The opening diameter of through hole 32 is less than the minimum length portion of the gas-forming agent formed body 33 accommodated in combustion chamber 30 Point, therefore gas-forming agent formed body 33 will not be embedded in through hole 32.

The internal diameter (Dmin) of inner tube 31 is greater than the maximum length (Lmax) of starting mix formed body 26, and starting mix formed body is most The ratio between long length (Lmax) and the internal diameter (Dmin) of inner tube 31 (Lmax/Dmin) are about 0.45.

When gas generator 1 for having used Fig. 1 in airbag apparatus, the ignition including gas-forming agent formed body 33 The operating of combustion method is illustrated.

When igniter 21 works, the combustion products such as flame are generated by ignition portion 22, form the starting mix in igniting chamber 20 Body 26, which is under fire, burns (stage 1).

When pressure rise in igniting chamber 20, part 29c (Fig. 3) cracking that cracks of closure member 29, igniting chamber 20 with The regional connectivity (stage 2) of the inside of inner tube 31.

Then, the starting mix formed body 26 of combustion state flows into inner tube 31, mobile to the 2nd end direction 31b, so that The 2nd end side 31b ratio more exists in the 1st end side 31a, and the increase in density of the through hole 32 of the 2nd end side 31b, because This, can spray the combustion products such as a greater amount of flame, high-temperature gas (stage 3,4) from the through hole 32 of the 2nd end side 31b.

Therefore, since the gas-forming agent formed body 33 in combustion chamber 30 being located adjacent to the part of position of diffusion part 40 Burning generates burning gases.Burning gases enter in diffusion part 40 after passing through mouth 53 by gas, from 43 row of gas discharge outlet Out, expand air bag.

Then, remaining gas-forming agent in combustion chamber 30 is made by the combustion product sprayed from the through hole 32 of inner tube 31 Formed body 33 burns and generates burning gases, is passed through in gas by mouth 53 and is discharged from gas discharge outlet 43, expands air bag.

It should be noted that closure member 29 be only can the raw cracking of cracking unit distribution, other parts will not cracking, therefore, The whole amount of the starting mix formed body 26 of combustion state in igniting chamber 20 enters in inner tube 31.

As a result, when using gas generator 1 shown in FIG. 1, it is contained in the gas-forming agent near diffusion part 40 and forms Body 33 is easy burning of being under fire, and the generation time of burning gases shortens, and therefore, can shorten since gas is played in igniter work Time until discharge can further shorten the expansion start time of air bag.

(2) gas generator of Fig. 4

Other than interior tube shape is different, the gas generator 1 of gas generator 1A and Fig. 1 of Fig. 4 is identical.

Inner tube 131, which only has in the 1st (closure member 29) side end 131a, is expanded into funnelform cyclic annular inclined wall portion 132 Aspect it is different from the inner tube 31 of Fig. 1.The gas generator 1A of Fig. 4 also works in the same manner as the gas generator of Fig. 11, but by Funnelform cyclic annular inclined wall portion 132, therefore, the starting mix of combustion state are expanded into the 1st end 131a with inner tube 131 Formed body 26 more readily flows into inner tube 131.

When using inner tube 131, can make the size of the part 29c that cracks of closure member 29 also with expand funnel The size of opening portion of cyclic annular inclined wall portion 132 correspondingly expand.

(3) gas generator of Fig. 5

Other than the shape of closure member 129, the basic phase of gas generator 1 of gas generator 1B and Fig. 1 of Fig. 5 Together.

Closure member 129 have bottom surface sections 129a, stretched out from side surface part 129b from bottom surface sections 129a to 21 side of igniter, from The central part of bottom surface sections 129a is to the side outstanding cylinder protruding portion 129c opposite with side surface part 129b.Cylinder protruding portion The top surface of 129c is that can crack part 129d (part for being equivalent to the 29c of Fig. 3).

In this way, the part 129d that cracks of closure member 129 is present in inner tube 31, therefore in the state of before work The starting mix formed body of combustion state can more successfully be implemented at work while increasing the amount of starting mix formed body 26 26 movement.

It can also be the inner tube in the gas generator 1A of the closure member 129 and Fig. 4 in the gas generator 1B by Fig. 5 131 embodiments being composed.

The present invention is described above.Certainly, the present invention includes various forms of deformations within its scope, these deformations do not take off From the scope of the present invention.In addition, whole schemes that those skilled in the art can clearly be regarded as deformation of the invention are wanted in right In the range of asking.