CN112172734A - Gas generator for small injection molding type safety air bag - Google Patents
Gas generator for small injection molding type safety air bag Download PDFInfo
- Publication number
- CN112172734A CN112172734A CN202011023648.2A CN202011023648A CN112172734A CN 112172734 A CN112172734 A CN 112172734A CN 202011023648 A CN202011023648 A CN 202011023648A CN 112172734 A CN112172734 A CN 112172734A
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- China
- Prior art keywords
- medicine cup
- cover
- filter screen
- lower cover
- medicine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
- B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
- B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
- B60R2021/26011—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using a filter through which the inflation gas passes
Abstract
The invention discloses a gas generator for a small injection molding type safety airbag, which comprises an upper cover and a lower cover, wherein the upper cover and the lower cover are fixedly connected to form a medicine cavity, the side wall of the upper cover is provided with a plurality of first exhaust holes and a rupture membrane, the rupture membrane is fixedly connected with the side wall of the upper cover, the rupture membrane is positioned in the medicine cavity and completely covers the first exhaust holes, a medicine cup assembly is arranged in the medicine cavity, the bottom center of the lower cover is sunken into the medicine cavity to form a groove, one end of the medicine cup assembly is connected with the bottom of the groove, the other end of the medicine cup assembly is located at the bottom of the upper cover, a center hole is formed in the bottom of the groove, an ignition assembly is arranged in the center hole and fixedly connected with the lower cover through injection molding, one end of the ignition assembly is located in the groove, the other end of the ignition assembly is located in the medicine cup assembly, one end of the filter is connected with the upper cover, the other end of the filter is connected with the lower cover, and the rupture membrane is located between the filter and the first exhaust hole. The invention has the beneficial effects that: the number of parts is reduced.
Description
Technical Field
The invention relates to the related technical field of safety air bags, in particular to a gas generator for a small injection molding type safety air bag.
Background
The function mode of the cash gas generator is that current is input into the electric ignition tube through a pin, so that the electric ignition tube is excited. The electric igniter can release flame to ignite the propellant and gas-generating charge in the propellant container. Then, the igniting agent and the gas generating agent start to burn, high-temperature gas and flame are released, the pressure in the cover rises rapidly, when the internal pressure reaches a certain value, the aluminum foil of the upper cover is broken, and the gas is discharged to the gas bag through the exhaust port to be filled with the safety airbag, so that the function of protecting a driver is achieved.
The primary structure of the cash generator is a short circuit clamp, a rubber ring, an ignition tube, a tube seat sleeve, a buffer sheet, a propellant/gas production powder, a filter screen cover, a medicine cup, a lower cover, a rupture membrane, an upper cover and a flange. The ignition tube and the tube seat sleeve are connected in a matched mode through bending and closing; the pipe seat sleeve is connected with the lower cover through a laser welding process; the pipe seat sleeve is connected with the medicine cup in a bending and pressing way; the lower cover is connected with the upper cover through friction welding; the rupture disk is connected with the upper cover by gluing; the upper cover is connected with the flange through laser welding.
The existing gas generator has the problems of large quantity of parts and complex structure, an ignition tube is arranged in the middle of a shell, when in ignition explosion, high internal pressure is generated instantly, the slope of a pressure curve is high, the internal gas pressure maintaining time of the generator is short, the internal pressure can not be maintained, the gas output and the pressure are lower than the expected standard, and the air bag is not filled enough; and the cost of parts is high, so that the gas generator has the problems of low market competitiveness, low profitability, slow increase of customer order quantity as expected plan and the number of matched vehicle types and the like.
The existing gas generator lower shell, the ignition tube seat and the ignition tube are assembled and connected in a laser welding and closing-in mode, in order to guarantee the sealing performance of the structure, two rubber rings which play a sealing role need to be used, the ignition tube seat sleeve is machined and formed by metal machining, if metal scraps are not cleaned cleanly after machining, the ignition tube is easily punctured to cause short circuit, and the production cost and the quality risk ratio of generator parts are all higher. In addition, the temperature of the metal lower cover is very high after the gas generator is ignited, so that the plastic of a plug connected with the ignition tube is easy to melt and deform.
Disclosure of Invention
The invention provides a small-sized gas generator for an injection-molded safety air bag, which has low part cost and aims to overcome the defect of high part cost of the gas generator in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a small-size injection molding formula gas generator for air bag, it includes upper cover and lower cover, the open end of lower cover outwards extends and forms the flange, upper cover and lower cover fixed connection just constitute a medicine chamber, be equipped with a plurality of exhaust hole one and rupture membrane on the lateral wall of upper cover, the lateral wall fixed connection of rupture membrane and upper cover, rupture membrane is located the medicine intracavity and covers a plurality of exhaust hole one completely, be equipped with medicine cup assembly, filter and gas production medicine in the medicine chamber, the bottom center of lower cover bends to the medicine intracavity and caves in and forms the recess, the one end of medicine cup assembly is connected with the bottom of recess, the other end of medicine cup assembly is located the bottom of upper cover, the bottom of recess is equipped with the centre bore, be equipped with the ignition assembly in the centre bore, the ignition assembly is through moulding plastics and lower cover fixed connection, the one end of ignition assembly is located the recess and is located outside the medicine chamber, the other end of the ignition assembly is located in the medicine cup assembly, one end of the filter is connected with the upper cover, the other end of the filter is connected with the lower cover, and the rupture membrane is located between the filter and the first exhaust hole.
The opening end of the lower cover extends outwards to form a flange, the upper cover and the lower cover are fixedly connected and form a medicine cavity, a plurality of first exhaust holes and a rupture membrane are arranged on the side wall of the upper cover, the rupture membrane is fixedly connected with the side wall of the upper cover, the rupture membrane is positioned in the medicine cavity and completely covers the first exhaust holes, a medicine cup assembly, a filter and a gas producing medicine are arranged in the medicine cavity, the center of the bottom of the lower cover is bent and sunken in the medicine cavity to form a groove, one end of the medicine cup assembly is connected with the bottom of the groove, the other end of the medicine cup assembly is positioned at the bottom of the upper cover, a center hole is formed in the bottom of the groove, an ignition assembly is arranged in the center hole, the ignition assembly is fixedly connected with the lower cover through injection molding, one end of the ignition assembly is positioned in the groove and outside the medicine cavity, and the other end of the ignition assembly is positioned, one end of the filter is connected with the upper cover, the other end of the filter is connected with the lower cover, and the rupture membrane is located between the filter and the first exhaust hole. The gas producing medicine releases high-temperature gas and flame through rapid combustion chemical reaction, the pressure in the medicine cavity rises rapidly, and the rupture membrane is positioned in the medicine cavity and completely covers the plurality of first exhaust holes, so that the rupture membrane is ruptured when the internal pressure reaches a certain value, and the rupture membrane is exhausted through the first exhaust holes and filled with the safety airbag to protect the safety of a driver; this scheme will integrate flange and lower cover formula lower cover as an organic whole, unites two into one and has left out the laser welding process between them, and the position of lower cover installation ignition assembly also is direct integrative stamping forming, does not need the outer machine processing of volume, and production convenient and fast for the good and bulk strength of lower cover portion leakproofness is big, has reached the purpose that the part is with low costs simultaneously.
Preferably, the diameter of the opening end of the groove is smaller than that of the bottom of the groove, injection molding bodies are arranged on the inner side and the outer side of the bottom of the lower cover and coated at the groove, a plurality of arc-shaped grooves are formed in the bottom of the groove, a plurality of convex hulls matched with the arc-shaped grooves are arranged on the injection molding bodies, and the ignition assembly is integrated with the lower cover through injection molding of the injection molding bodies. The anti-rotation characteristics such as recess back-off design, convex closure, arc wall ensure that the injection molding body can not influence the gas tightness and the intensity performance of generator because of rotating.
Preferably, the part of the injection molding body, which is located on the outer side of the bottom of the lower cover, is provided with a mounting groove, the central axis of the mounting groove and the central axis of the central hole are coaxial, the part of the injection molding body, which is located on the inner side of the bottom of the lower cover, is provided with an annular convex block, one end of the ignition assembly is located in the annular convex block and is integrated with the lower cover through injection molding of the annular convex block, and the other end of the ignition assembly penetrates through the injection molding body and is located in. The injection molding body is made into an inverted buckle structure, so that the strength of the injection molding body is improved, and the end of the injection molding body is effectively prevented from cracking and falling off when the generator is ignited; the complex structure refinement of closing up from the gasket welding with the ignition assembly structure is the integral type structure of moulding plastics of simpler cheap, has reduced spare part quantity.
As preferred, the filter includes filter screen and filter screen lid, the shape of filter screen is ring shape, the one end of filter screen and the inside wall phase-match of lower cover and be connected with the bottom of lower cover, the other end and the filter screen lid of filter screen are connected, the rupture membrane is located filter screen and exhaust hole between one, it is located between medicine cup assembly and the filter screen to produce the gas medicine, the filter screen lid matches with the bottom of upper cover, the one end that medicine cup assembly is located the upper cover bottom is connected with the filter screen lid, one side of filter screen lid is connected with the bottom of upper cover, the corresponding opposite side of filter screen lid and the bottom of lower cover all are connected with the buffer wafer, the buffer wafer on the lower cover bottom is located between filter screen and the injection molding body, the buffer wafer on the filter screen lid is located between filter screen and the medicine cup assembly. The filter screen filters the generated gas, retains solid residues in the gas, has a certain cooling effect on high-temperature gas and is usually made of metal mesh materials; the buffer sheet can effectively buffer the internal pressure, prevent the explosion of upper cover or lower cover for the pressure that inside sharply rises is discharged from exhaust hole one more high-efficiently, improves air bag's the gas filling volume, thereby more is favorable to human safety protection.
Preferably, the medicine cup assembly comprises a big medicine cup, an aluminum medicine cup and a medicine cup cover, a plurality of exhaust holes II corresponding to the aluminum medicine cup are formed in the side wall of the big medicine cup, one end of the big medicine cup is located outside the annular convex block and fixedly connected with the annular convex block through laser welding, the other end of the big medicine cup is connected with the filter screen cover, a propellant powder is arranged in the aluminum medicine cup, the aluminum medicine cup and the medicine cup cover are both located in the big medicine cup, one end of the aluminum medicine cup is an open end and located at a position corresponding to the ignition assembly, the other end of the aluminum medicine cup is connected with the medicine cup cover, one end of the medicine cup cover is connected with the aluminum medicine cup, the other end of the medicine cup cover is connected with the filter screen cover, and the buffer sheet on the filter screen cover is located between the filter screen and the big medicine cup. The current is excited by the ignition assembly to generate flame to ignite the pyrotechnic composition, the pyrotechnic composition amplifies ignition energy and smoothly ignites the gas production composition, the gas production composition converts most of solid chemical substances into gas through rapid combustion chemical reaction, so that the pressure in the composition cavity is rapidly increased, when the internal pressure reaches a certain value, the aluminum foil of the upper cover is broken, and the gas is discharged through the first exhaust hole and filled with the safety airbag, so that the function of protecting a driver is achieved; the medicine cup assembly is changed from a single medicine cup into a split charging design of a large medicine cup and an aluminum medicine cup, so that the production efficiency is improved, and the convenience and the safety of assembly are improved as the transfer powder is independently filled; big medicine cup passes through laser welding and annular lug fixed connection, has improved big medicine cup's leakproofness when firm in connection.
Preferably, the medicine cup assembly comprises a big medicine cup, an aluminum medicine cup and a medicine cup cover, a plurality of exhaust holes II corresponding to the aluminum medicine cup are formed in the side wall of the big medicine cup, one end of the big medicine cup is located outside the annular convex block, the big medicine cup is connected with the annular convex block through interference fit, the other end of the big medicine cup is connected with the filter screen cover, a propellant powder is arranged in the aluminum medicine cup, the aluminum medicine cup and the medicine cup cover are both located in the big medicine cup, one end of the aluminum medicine cup is an open end and is located at a position corresponding to the ignition assembly, the other end of the aluminum medicine cup is connected with the medicine cup cover, one end of the medicine cup cover is connected with the aluminum medicine cup, the other end of the medicine cup cover is connected with the filter screen cover, and the buffer sheet on the filter screen cover is located between the filter screen and the big medicine cup. The big medicine cup is fixedly connected with the annular convex block through interference fit, and the tightness of the big medicine cup is improved while the big medicine cup is firmly connected.
Preferably, the ignition assembly comprises an ignition tube and a short circuit clamp, the ignition tube comprises a tube sleeve and two electrodes, the tube sleeve is located in the annular convex block and is integrated with the lower cover through injection molding of the annular convex block, the short circuit clamp is located in the installation groove and is integrated with the groove through an injection molding body, two insertion holes corresponding to the electrodes are formed in the short circuit clamp, one end of each electrode is fixedly connected with the tube sleeve, and the other end of each electrode penetrates through the injection molding body and is located in the corresponding insertion hole. Current is input into the pipe sleeve through the electrode, so that the pipe sleeve is excited, flame is released from the pipe sleeve, the igniting primer and the gas producing explosive are ignited, then the primer and the gas producing explosive start to burn rapidly, high-temperature gas and flame are released, the pressure in the explosive cavity rises rapidly, when the internal pressure reaches a certain value, the upper cover rupture membrane is broken, the gas is discharged through the first gas outlet and is filled with the safety airbag, and the purpose of protecting a driver in the vehicle is achieved; the pipe sleeve and the short circuit clamp are fixedly combined with the lower cover into a whole in an injection molding mode, and the mode is low in cost, convenient and fast to produce, free of influence on the performance of the ignition pipe and capable of achieving a heat insulation function.
Preferably, one end of the short circuit clamp is matched with the bottom of the installation groove, the diameter of the short circuit clamp is larger than that of the other end of the short circuit clamp, the other end of the short circuit clamp is located in the opening end of the installation groove and forms a gap with the side wall of the opening end of the installation groove, the diameter of the opening end of the installation groove and the diameter of the bottom of the installation groove are smaller than that of the middle portion of the installation groove, and all bending portions of the lower cover are provided with fillets. Design like this makes the mounting groove inner wall have irregular polygon design, is convenient for improve the fastness that the short circuit pressed from both sides and car air bag socket switch cooperation installation, and the department of bending of lower cover all adopts the radius angle transition simultaneously, has avoided appearing gas tightness, acute angle or stress concentration scheduling problem when preventing changeing to the intensity of injection molding has been improved.
Preferably, one end of the flange is recessed towards the bottom of the lower cover to form an arc-shaped structure and is connected with the opening end of the lower cover into a whole, and the other end of the flange is parallel to the bottom of the lower cover. The arc-shaped structure avoids the problems of air tightness, acute angles or stress concentration and the like while preventing rotation.
Preferably, the open end of the upper cover is fixedly connected with the open end of the lower cover by friction welding. Thereby improving the tightness of the drug cavity.
The invention has the beneficial effects that: the flange, the lower cover and the ignition assembly are combined into one, so that the laser welding process of the flange and the lower cover is omitted; the ignition assembly is simplified from a welding insert type complex structure into an injection molding integrated compact structure, so that the number of parts is reduced, the weight of a product is reduced, and the quality stability of the product is optimized; the injection molding body is made into an inverted buckle structure, so that the strength of the injection molding body is improved, and the end of the injection molding body is effectively prevented from cracking and falling off when the generator is ignited; the special concave structure is arranged around the injection molding body, so that the anti-rotation problem of the same type of products is solved, and the effect of increasing the structural strength can be achieved; the medicine cup assembly is changed from a single medicine cup into a small medicine cup split charging design, and the produced powder is independently filled, so that the production efficiency is improved, and the assembly convenience and safety are improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the lower cover;
fig. 3 is a schematic structural view of the installation of the lower cover with the medicine cup assembly and the ignition assembly respectively.
In the figure: 1. the explosive gun comprises an upper cover, 2 parts of a lower cover, 3 parts of a flange, 4 parts of an explosive cavity, 5 parts of a first exhaust hole, 6 parts of a rupture membrane, 7 parts of an explosive cup assembly, 8 parts of a filter, 9 parts of gas producing explosive, 10 parts of a groove, 11 parts of a central hole, 12 parts of an ignition assembly, 13 parts of an injection molding body, 14 parts of an arc-shaped groove, 15 parts of an installation groove, 16 parts of an annular bump, 17 parts of a filter screen, 18 parts of a filter screen cover, 19 parts of a buffer sheet, 20 parts of a big explosive cup, 21 parts of an aluminum explosive cup, 22 parts of an explosive cup cover, 23 parts of a second exhaust hole, 24 parts of a propellant, 25 parts of an ignition tube, 26 parts of a short circuit clamp, 27 parts.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
In the embodiment shown in fig. 1, a small-sized gas generator for an injection-molded airbag comprises an upper cover 1 and a lower cover 2, wherein the open end of the lower cover 2 extends outwards to form a flange 3, the upper cover 1 and the lower cover 2 are fixedly connected to form a medicine cavity 4, the side wall of the upper cover 1 is provided with a plurality of vent holes 5 and a rupture membrane 6, the rupture membrane 6 is fixedly connected with the side wall of the upper cover 1, the rupture membrane 6 is positioned in the medicine cavity 4 and completely covers the vent holes 5, a medicine cup assembly 7, a filter 8 and a gas generating medicine 9 are arranged in the medicine cavity 4, as shown in fig. 1, 2 and 3, the center of the bottom of the lower cover 2 is bent towards the medicine cavity 4 to form a groove 10, one end of the medicine cup assembly 7 is connected with the bottom of the groove 10, the other end of the medicine cup assembly 7 is positioned at the bottom of the upper cover 1, the bottom of the groove 10 is provided with a central hole 11, and an ignition assembly 12, the ignition assembly 12 is fixedly connected with the lower cover 2 through injection molding, one end of the ignition assembly 12 is located in the groove 10 and located outside the medicine cavity 4, the other end of the ignition assembly 12 is located in the medicine cup assembly 7, one end of the filter 8 is connected with the upper cover 1, the other end of the filter 8 is connected with the lower cover 2, and the rupture disk 6 is located between the filter 8 and the first exhaust hole 5.
As shown in fig. 1 and 3, the diameter of the opening end of the groove 10 is smaller than the diameter of the bottom of the groove 10, injection molded bodies 13 are arranged on the inner side and the outer side of the bottom of the lower cover 2, the injection molded bodies 13 are coated at the groove 10, a plurality of arc-shaped grooves 14 are arranged at the bottom of the groove 10, a plurality of convex hulls matched with the arc-shaped grooves 14 are arranged on the injection molded bodies 13, and the ignition assembly 12 is integrated with the lower cover 2 through injection molding of the injection molded bodies 13.
As shown in fig. 1 and 3, a mounting groove 15 is formed in a portion of the injection molded body 13 located on the outer side of the bottom of the lower cover 2, a central axis of the mounting groove 15 is coaxial with a central axis of the central hole 11, an annular protrusion 16 is formed in a portion of the injection molded body 13 located on the inner side of the bottom of the lower cover 2, one end of the ignition assembly 12 is located in the annular protrusion 16 and is integrated with the lower cover 2 through injection molding of the annular protrusion 16, and the other end of the ignition assembly 12 penetrates through the injection molded body 13 and is located in the mounting groove 15.
As shown in fig. 1, the filter 8 includes a filter screen 17 and a filter screen cover 18, the filter screen 17 is circular, one end of the filter screen 17 is matched with the inner side wall of the lower cover 2 and is connected with the bottom of the lower cover 2, the other end of the filter screen 17 is connected with the filter screen cover 18, the rupture membrane 6 is located between the filter screen 17 and the first exhaust hole 5, the gas producing drug 9 is located between the drug cup assembly 7 and the filter screen 17, the filter screen cover 18 is matched with the bottom of the upper cover 1, one end of the drug cup assembly 7 located at the bottom of the upper cover 1 is connected with the filter screen cover 18, one side of the filter screen cover 18 is connected with the bottom of the upper cover 1, the other side corresponding to the filter screen cover 18 and the bottom of the lower cover 2 are both connected with a buffer sheet 19, the buffer sheet 19 on the bottom of the lower cover 2 is located between the filter screen 17 and the injection molding body 13, and the buffer sheet.
As shown in fig. 1 and 3, the medicine cup assembly 7 includes a big medicine cup 20, an aluminum medicine cup 21 and a medicine cup cover 22, a plurality of vent holes two 23 corresponding to the aluminum medicine cup 21 are provided on the side wall of the big medicine cup 20, one end of the big medicine cup 20 is located outside the annular bump 16 and fixedly connected with the annular bump 16 by laser welding, the other end of the big medicine cup 20 is connected with a filter screen cover 18, a propellant 24 is provided in the aluminum medicine cup 21, the aluminum medicine cup 21 and the medicine cup cover 22 are both located in the big medicine cup 20, one end of the aluminum medicine cup 21 is an open end and is located at a position corresponding to the ignition assembly 12, the other end of the aluminum medicine cup 21 is connected with the medicine cup cover 22, one end of the medicine cup cover 22 is connected with the aluminum medicine cup 21, the other end of the medicine cup cover 22 is connected with the filter screen cover 18, and a buffer sheet 19 on the filter screen cover 18 is located between the filter screen 17 and the big medicine.
As shown in fig. 1 and 3, the medicine cup assembly 7 includes a big medicine cup 20, an aluminum medicine cup 21 and a medicine cup cover 22, a plurality of exhaust holes two 23 corresponding to the aluminum medicine cup 21 are provided on the side wall of the big medicine cup 20, one end of the big medicine cup 20 is located outside the annular bump 16, the big medicine cup 20 is connected with the annular bump 16 through interference fit, the other end of the big medicine cup 20 is connected with a filter screen cover 18, a propellant 24 is provided in the aluminum medicine cup 21, the aluminum medicine cup 21 and the medicine cup cover 22 are both located in the big medicine cup 20, one end of the aluminum medicine cup 21 is an open end and is located at a position corresponding to the ignition assembly 12, the other end of the aluminum medicine cup 21 is connected with the medicine cup cover 22, one end of the medicine cup cover 22 is connected with the aluminum medicine cup 21, the other end of the medicine cup cover 22 is connected with the filter screen cover 18, and a buffer sheet 19 on the filter screen cover 18 is located between the filter screen 17 and the.
As shown in fig. 1 and 3, the ignition assembly 12 includes an ignition tube 25 and a short circuit clip 26, the ignition tube 25 includes a tube sleeve 27 and two electrodes 28, the tube sleeve 27 is located in the annular protrusion 16 and is formed integrally with the lower cover 2 by injection molding of the annular protrusion 16, the short circuit clip 26 is located in the mounting groove 15, the short circuit clip 26 is formed integrally with the groove 10 by the injection molded body 13, two insertion holes 29 corresponding to the electrodes 28 are formed in the short circuit clip 26, one end of each electrode 28 is fixedly connected with the tube sleeve 27, and the other end of each electrode 28 penetrates through the injection molded body 13 and is located in the insertion hole 29.
As shown in fig. 1 and 3, one end of the short circuit clip 26 is matched with the bottom of the mounting groove 15 and has a diameter larger than that of the other end, the other end of the short circuit clip 26 is positioned in the opening end of the mounting groove 15 and forms a gap with the side wall at the opening end of the mounting groove 15, the diameter of the opening end of the mounting groove 15 and the diameter of the bottom of the mounting groove 15 are both smaller than that of the middle part thereof, and as shown in fig. 2, all bent parts on the lower cover 2 are provided with rounded corners.
As shown in fig. 1, 2 and 3, one end of the flange 3 is recessed toward the bottom of the lower cover 2 to form an arc structure and is connected with the open end of the lower cover 2 into a whole, and the other end of the flange 3 is parallel to the bottom of the lower cover 2.
As shown in fig. 1, the open end of the upper cap 1 is fixedly coupled to the open end of the lower cap 2 by friction welding.
The miniaturized injection-molded gas generator according to the present patent functions in such a manner that a current is inputted into the socket 27 through the electrode 28 and excites the socket 27, the socket 27 discharges a flame, and the transfer charge 24 and the gas generant 9 are ignited. Then, the transfer powder 24 and the gas producing powder 9 start to burn rapidly, high-temperature gas and flame are released, the pressure in the generator powder cavity 4 rises rapidly, when the internal pressure reaches a certain value, the upper cover 1 is broken to break the rupture membrane 6, and the rupture membrane is discharged through the first exhaust hole 5 and filled with an airbag, so that the aim of protecting a driver in the vehicle is fulfilled.
Be provided with the centre bore 11 that power supply electrode 28 passed on the gas generator lower cover 2 of this patent, the ignition tube 25 is fixed with the help of the installation of injection molding 13, and upper cover 1 is metal material through drawing and stamping forming with lower cover 2, dashes out the centre bore 11 of installation electrode 28 simultaneously. The injection molding body 13 is formed by injection molding of high-temperature-resistant engineering plastics, plays a role of fixing the point fire tube 25 in the lower cover 2, is installed in a matched mode with an automobile safety airbag socket switch, and is used for preventing the injection molding body 13 from rotating in the lower cover 2 to cause the gas generator to have a gas tightness problem, and irregular surfaces are punched on the side wall of the lower cover 2 to serve as anti-rotation back-off and optimize the strength of the injection molding body 13. In order to avoid the problems of air tightness, acute angles or stress concentration and the like when the anti-rotation is carried out, the edges of all bending positions are in fillet transition.
The integral type lower cover 2 of moulding plastics of this patent has integrated three spare part in an organic whole, has effectively reduced spare part quantity, has simplified the manufacture craft, and manufacturing cost is reduced, this lower cover 2's new back-off and body prevent changeing the design and effectively avoided the defect that similar product exists on the market, possess higher intensity, better performance, lower manufacturing cost, lighter weight, to a great extent has promoted whole gas generator's market competition, therefore the order is expected to look good.
The integrative structure of moulding plastics of this patent fully considers the expend with heat and contract with cold characteristics of the plastic body in the design, adopt the fine material of nylon glass of high melting point and high strength, the shrinkage after having reduced to mould plastics to the at utmost, the intensity stability of injection molding 13 under high temperature welding and high temperature point explosion condition has been optimized, adopt interference fit in medicine cup assembly design, laser welding and support the end design and guaranteed assembly firmness and performance uniformity, prevent to drop or quality problems such as fracture in the point explosion process.
Claims (10)
1. The utility model provides a small-size injection molding formula gas generator for air bag, characterized by includes upper cover (1) and lower cover (2), the open end of lower cover (2) outwards extends and forms flange (3), upper cover (1) and lower cover (2) fixed connection just constitute a medicine chamber (4), be equipped with a plurality of exhaust hole (5) and rupture membrane (6) on the lateral wall of upper cover (1), rupture membrane (6) and the lateral wall fixed connection of upper cover (1), rupture membrane (6) are located medicine chamber (4) and cover a plurality of exhaust hole (5) completely, be equipped with medicine cup assembly (7), filter (8) and gas production medicine (9) in medicine chamber (4), the bottom center of lower cover (2) is bent in medicine chamber (4) and is sunken to form recess (10), the one end of medicine cup assembly (7) is connected with the bottom of recess (10), the other end of medicine cup assembly (7) is located the bottom of upper cover (1), the bottom of recess (10) is equipped with centre bore (11), be equipped with ignition assembly (12) in centre bore (11), ignition assembly (12) through moulding plastics with lower cover (2) fixed connection, the one end of ignition assembly (12) is located recess (10) and is located outside medicine chamber (4), the other end of ignition assembly (12) is located medicine cup assembly (7), the one end and the upper cover (1) of filter (8) are connected, the other end and the lower cover (2) of filter (8) are connected, rupture membrane (6) are located between filter (8) and exhaust hole (5).
2. The gas generator for the small injection-molded airbag as claimed in claim 1, wherein the diameter of the opening end of the groove (10) is smaller than the diameter of the bottom of the groove (10), the inner side and the outer side of the bottom of the lower cover (2) are provided with injection molded bodies (13), the injection molded bodies (13) are coated at the position of the groove (10), the bottom of the groove (10) is provided with a plurality of arc-shaped grooves (14), the injection molded bodies (13) are provided with a plurality of convex hulls matched with the arc-shaped grooves (14), and the ignition assembly (12) is integrated with the lower cover (2) through injection molding of the injection molded bodies (13).
3. The gas generator for the small injection-molded airbag as claimed in claim 2, wherein a mounting groove (15) is formed in a portion of the injection-molded body (13) located outside the bottom of the lower cover (2), a central axis of the mounting groove (15) is coaxial with a central axis of the central hole (11), an annular protrusion (16) is formed in a portion of the injection-molded body (13) located inside the bottom of the lower cover (2), one end of the ignition assembly (12) is located in the annular protrusion (16) and is integrated with the lower cover (2) through injection molding of the annular protrusion (16), and the other end of the ignition assembly (12) penetrates through the injection-molded body (13) and is located in the mounting groove (15).
4. The gas generator for the small injection-molded airbag according to claim 3, wherein the filter (8) comprises a filter screen (17) and a filter screen cover (18), the filter screen (17) is in the shape of a circular ring, one end of the filter screen (17) is matched with the inner side wall of the lower cover (2) and is connected with the bottom of the lower cover (2), the other end of the filter screen (17) is connected with the filter screen cover (18), the rupture disk (6) is positioned between the filter screen (17) and the first exhaust hole (5), the gas generant (9) is positioned between the cup assembly (7) and the filter screen (17), the filter screen cover (18) is matched with the bottom of the upper cover (1), one end of the cup assembly (7) positioned at the bottom of the upper cover (1) is connected with the filter screen cover (18), one side of the filter screen cover (18) is connected with the bottom of the upper cover (1), the other side that filter screen lid (18) is corresponding and the bottom of lower cover (2) all are connected with buffer sheet (19), buffer sheet (19) on lower cover (2) bottom are located between filter screen (17) and injection molding body (13), buffer sheet (19) on filter screen lid (18) are located between filter screen (17) and medicine cup assembly (7).
5. The gas generator for the small injection molding type airbag as claimed in claim 4, wherein the medicine cup assembly (7) comprises a big medicine cup (20), an aluminum medicine cup (21) and a medicine cup cover (22), a plurality of second exhaust holes (23) corresponding to the aluminum medicine cup (21) are formed in the side wall of the big medicine cup (20), one end of the big medicine cup (20) is located outside the annular bump (16) and fixedly connected with the annular bump (16) through laser welding, the other end of the big medicine cup (20) is connected with the filter screen cover (18), a propellant (24) is arranged in the aluminum medicine cup (21), the aluminum medicine cup (21) and the medicine cup cover (22) are both located in the big medicine cup (20), one end of the aluminum medicine cup (21) is an open end and is located at a position corresponding to the ignition assembly cover (12), and the other end of the aluminum medicine cup (21) is connected with the medicine cup (22), one end of the medicine cup cover (22) is connected with the aluminum medicine cup (21), the other end of the medicine cup cover (22) is connected with the filter screen cover (18), and the buffer sheet (19) on the filter screen cover (18) is located between the filter screen (17) and the large medicine cup (20).
6. The gas generator for the small injection molding type safety airbag according to claim 4, wherein the medicine cup assembly (7) comprises a big medicine cup (20), an aluminum medicine cup (21) and a medicine cup cover (22), a plurality of exhaust holes (23) corresponding to the aluminum medicine cup (21) are arranged on the side wall of the big medicine cup (20), one end of the big medicine cup (20) is positioned outside the annular bump (16), the big medicine cup (20) is connected with the annular bump (16) through interference fit, the other end of the big medicine cup (20) is connected with the filter screen cover (18), a propellant powder (24) is arranged in the aluminum medicine cup (21), the aluminum medicine cup (21) and the medicine cup cover (22) are both positioned in the big medicine cup (20), one end of the aluminum medicine cup (21) is an open end and is positioned at a position corresponding to the ignition assembly (12), the other end of the aluminum medicine cup (21) is connected with the medicine cup (22), one end of the medicine cup cover (22) is connected with the aluminum medicine cup (21), the other end of the medicine cup cover (22) is connected with the filter screen cover (18), and the buffer sheet (19) on the filter screen cover (18) is located between the filter screen (17) and the large medicine cup (20).
7. A gas generator for a small injection-molded airbag according to claim 3, wherein the ignition assembly (12) comprises an ignition tube (25) and a short-circuiting clip (26), the ignition tube (25) comprises a tube sleeve (27) and two electrodes (28), the tube sleeve (27) is located in the annular projection (16) and is integrated with the lower cover (2) by injection molding of the annular projection (16), the short-circuiting clip (26) is located in the mounting groove (15), the short-circuiting clip (26) is integrated with the groove (10) by injection molding (13), two insertion holes (29) corresponding to the electrodes (28) are formed in the short-circuiting clip (26), one end of the electrode (28) is fixedly connected with the tube sleeve (27), and the other end of the electrode (28) penetrates through the injection molding (13) and is located in the insertion hole (29).
8. The gas generator for a small injection-molded airbag according to claim 7, wherein one end of the short-circuiting clip (26) is fitted to the bottom of the mounting groove (15) and has a diameter larger than that of the other end thereof, the other end of the short-circuiting clip (26) is positioned in the open end of the mounting groove (15) and forms a gap with the side wall at the open end of the mounting groove (15), the diameter of the open end of the mounting groove (15) and the diameter of the bottom of the mounting groove (15) are both smaller than those of the middle portion thereof, and all bent portions of the lower cover (2) are provided with rounded corners.
9. The gas generator for a small injection-molded airbag as defined in claim 1, wherein one end of the flange (3) is recessed toward the bottom of the lower cover (2) to form an arc structure and is integrally connected to the open end of the lower cover (2), and the other end of the flange (3) is parallel to the bottom of the lower cover (2).
10. The gas generator for a small injection-molded airbag as claimed in claim 1, wherein the open end of the upper cover (1) is fixedly connected to the open end of the lower cover (2) by friction welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011023648.2A CN112172734A (en) | 2020-09-25 | 2020-09-25 | Gas generator for small injection molding type safety air bag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011023648.2A CN112172734A (en) | 2020-09-25 | 2020-09-25 | Gas generator for small injection molding type safety air bag |
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| CN112172734A true CN112172734A (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011023648.2A Pending CN112172734A (en) | 2020-09-25 | 2020-09-25 | Gas generator for small injection molding type safety air bag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113525287A (en) * | 2021-07-02 | 2021-10-22 | 均胜汽车安全系统(湖州)有限公司 | Novel injection molding type DAB gas generator |
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