Gas generator

Abstract

This utility model relates to the field of automotive airbag technology, specifically to a gas generator. The gas generator includes a housing, an ignition unit, and an injection-molded connector. The housing has an inner cavity. The ignition unit includes an igniter and an ignition tube. The igniter is connected to the housing via the injection-molded connector, with the ignition end protruding from the connector and extending into the ignition tube, and the pin end protruding from the connector and extending out of the housing. The ignition tube is located in the inner cavity and connected to the connector. The gas generator has a simple structure, is easy to install, improves the installation stability of the ignition unit and its internal sealing, and enables long-term closed working environment and structural stability.

Description

Technical Field

[0001] This utility model relates to the field of automotive airbag technology, and more specifically, to a gas generator. Background Technology

[0002] In automotive airbag systems, the gas generator is a key component. Its function is to rapidly generate a large amount of gas in emergencies such as vehicle collisions, causing the airbag to inflate quickly and thus protecting occupants. Existing gas generators suffer from complex connections and fixing methods between components, leading to a cumbersome assembly process requiring multiple connection techniques, increasing manufacturing and time costs. Furthermore, welding is commonly used for connections during manufacturing; however, welding processes demand high skill levels from equipment and operators, and consistent welding quality is difficult to guarantee, easily resulting in problems such as incomplete welds and missed welds, which in turn affect the sealing performance and overall strength of the gas generator. Utility Model Content

[0003] The purpose of this utility model is to provide a gas generator with a simple structure and convenient installation, which can improve the installation stability of the ignition unit and the internal sealing performance, and can achieve a long-term closed working environment and structural stability.

[0004] The embodiments of this utility model can be implemented as follows: This utility model provides a gas generator, which includes a housing, an ignition unit, and an injection-molded connector; The housing has an inner cavity; the ignition unit includes an igniter and an ignition tube; the igniter is connected to the housing via an injection-molded connector, and the ignition end of the igniter protrudes from the injection-molded connector and extends into the ignition tube, while the pin end of the igniter protrudes from the injection-molded connector and extends out of the housing; the ignition tube is located in the inner cavity and is connected to the injection-molded connector.

[0005] In an optional embodiment, the housing includes an upper housing and a lower housing, the upper housing and the lower housing being connected and together forming the inner cavity; The lower housing has an opening that communicates with the inner cavity, and the injection-molded connector is connected to the opening.

[0006] In an optional embodiment, the lower housing is provided with a receiving groove recessed toward the inner cavity, and the opening is formed at the bottom of the receiving groove; Part of the injection-molded connector is housed in the receiving groove, while the remaining part of the injection-molded connector extends into the inner cavity and connects to the ignition tube.

[0007] In an optional embodiment, the bottom of the receiving groove is provided with a first connecting part and a second connecting part around the opening, the first connecting part being located inside the bottom of the receiving groove and the second connecting part being located outside the bottom of the receiving groove. Both the first connecting part and the second connecting part are grooves or protrusions.

[0008] In an optional embodiment, both the first connecting part and the second connecting part are grooves, and the cross-section of the groove is trapezoidal, polygonal, or more than 1 / 2 circle. In this groove, the cross-sectional width of at least a portion of the groove gradually increases from the opening of the groove towards its bottom.

[0009] In an alternative embodiment, the groove is inclined relative to the axial direction of the housing.

[0010] In an optional embodiment, both the first connecting portion and the second connecting portion are protrusions, and the cross-section of the protrusion is a circle, rectangle, or triangle exceeding 1 / 2 of its length. Along the protruding direction of the protrusion, the width of at least a portion of the protrusion gradually increases.

[0011] In an optional embodiment, the protrusion is inclined relative to the axial direction of the housing.

[0012] In an optional embodiment, the bottom of the receiving groove is provided with a bent portion around the axis of the opening, and the injection-molded connector covers the bent portion.

[0013] In an optional embodiment, the bent portion bends toward the inside or outside of the receiving groove, and the bent portion is formed with a groove.

[0014] The beneficial effects of the gas generator provided in this embodiment of the present invention include: The gas generator includes a housing, an ignition unit, and an injection-molded connector. The housing has an inner cavity. The ignition unit includes an igniter and an ignition tube. The igniter is connected to the housing via the injection-molded connector, with the ignition end protruding from the connector and extending into the ignition tube, and the pin end protruding from the connector and extending out of the housing. The ignition tube is located in the inner cavity and connected to the connector. This gas generator has a simple structure, is easy to install, improves the installation stability of the ignition unit and its internal sealing, and enables long-term closed working environments and structural stability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the gas generator provided in this embodiment; Figure 2This is a structural schematic diagram of the ignition unit and injection-molded connector provided in this embodiment; Figure 3 This is a schematic diagram of the structure of the first connecting part and the second connecting part provided in this embodiment; Figure 4 A schematic diagram of the structure of the first connecting part and the second connecting part being trapezoidal grooves provided in this embodiment; Figure 5 This is a schematic diagram of the structure of the first connecting part and the second connecting part being polygonal grooves provided in this embodiment; Figure 6 This is a schematic diagram showing that the first connecting part and the second connecting part are inclined grooves in this embodiment; Figure 7 This is a schematic diagram showing the structure of the first connecting part and the second connecting part as protrusions in this embodiment; Figure 8 The first connecting part and the second connecting part provided in this embodiment are structural diagrams of inclined protrusions; Figure 9 A schematic diagram of the structure provided in this embodiment, showing the bending portion bending towards the receiving groove; Figure 10 This is a schematic diagram of the structure provided in this embodiment, showing the bending portion bending towards the inner cavity. Figure 11 This is a schematic diagram of the structure of the bend and the opening spacing provided in this embodiment.

[0017] Icons: 100-Gas generator; 110-Housing; 130-Ignition unit; 150-Injection molded connector; 111-Inner cavity; 131-Igniter; 132-Ignition tube; 112-Upper housing; 113-Lower housing; 114-Opening; 115-Receiving groove; 116-First connecting part; 117-Second connecting part; 118-Groove; 119-Protrusion; 121-Bending part; 122-Groove. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0024] Please refer to Figure 1 and Figure 2 This embodiment provides a gas generator 100, which includes a housing 110, an ignition unit 130, and an injection-molded connector 150. The housing 110 is provided with an inner cavity 111; the ignition unit 130 includes an igniter 131 and an ignition tube 132; the igniter 131 is connected to the housing 110 through an injection molding connector 150, and the ignition end of the igniter 131 protrudes from the injection molding connector 150 and extends into the ignition tube 132, and the pin end of the igniter 131 protrudes from the injection molding connector 150 and extends out of the housing 110; the ignition tube 132 is located in the inner cavity 111 and is connected to the injection molding connector 150.

[0025] Please refer to Figure 1 and Figure 2 The working principle of the gas generator 100 is as follows: The gas generator 100 includes a housing 110, an ignition unit 130, and an injection-molded connector 150. The housing 110 is provided with an inner cavity 111. The ignition unit 130 includes an igniter 131 and an ignition tube 132. The igniter 131 is connected to the housing 110 through the injection-molded connector 150, and the ignition end of the igniter 131 protrudes from the injection-molded connector 150 and extends into the ignition tube 132. The pin end of the igniter 131 protrudes from the injection-molded connector 150 and extends out of the housing 110. The ignition tube 132 is located in the inner cavity 111 and is connected to the injection-molded connector 150.

[0026] Therefore, through the above structural design, the injection-molded connector 150 can be formed by injection molding, thereby installing the igniter 131 and the ignition tube 132 of the ignition tube 132 onto the housing 110, and making the ignition tube 132 and the igniter 131 stably connected to the housing 110. Moreover, this design can improve assembly efficiency and the sealing of the connection through injection molding. Therefore, the gas generator 100 has a simple structure, is easy to install, can improve the installation stability of the ignition unit 130 and the internal sealing, and can achieve a long-term closed working environment and structural stability.

[0027] It should be noted that the working process of the gas generator 100 is as follows: when the pin end of the igniter 131 receives a signal from the external structure, causing its ignition end to ignite the propellant in the ignition tube 132, the gas-generating agent in the inner cavity 111 will be ignited through the hole on the ignition tube 132 that connects the inside and outside of the ignition tube 132, thereby causing the gas-generating agent to produce gas, and then the other gas produced will be quickly discharged through the vent on the housing 110.

[0028] Further, please refer to Figures 1-3 In this embodiment, when configuring the housing 110, the housing 110 includes an upper housing 112 and a lower housing 113. The upper housing 112 and the lower housing 113 are connected and together form the inner cavity 111. The lower housing 113 is provided with an opening 114 communicating with the inner cavity 111, and an injection-molded connector 150 is connected to the opening 114. It should be noted that when connecting the upper housing 112 and the lower housing 113, a connecting flange can be used to connect the upper housing 112 and the lower housing 113 as a whole, or welding or other methods can be used to connect the upper housing 112 and the lower housing 113, which will not be elaborated further here.

[0029] When configuring the ignition unit 130, since the ignition tube 132 placed in the inner cavity 111 is used to hold the ignition propellant, and the other areas in the inner cavity 111 except for the ignition tube 132 are used to hold the gas-generating propellant, and the ignition end of the igniter 131 is located in the ignition tube 132 and is in contact with the ignition propellant inside it, while the pin end of the igniter 131 needs to extend out of the inner cavity 111 to be electrically connected to the external structure, in order to improve the installation stability of the igniter 131, the lower housing 113 is provided with a receiving groove 115 recessed towards the inner cavity 111, and the opening 114 is opened at the bottom of the receiving groove 115; part of the injection-molded connector 150 is accommodated in the receiving groove 115, and the remaining part of the injection-molded connector 150 extends into the inner cavity 111 and is connected to the ignition tube 132.

[0030] Therefore, through the above structural arrangement, the injection-molded connector 150 can mate with the receiving groove 115, thereby increasing its contact area with the lower housing 113, thus improving its installation stability and the overall structural sealing. Furthermore, this arrangement allows the igniter 131 to span the opening 114, further enhancing its installation stability and facilitating the extension of its ignition end into the ignition tube 132 and the protrusion of its pin end out of the inner cavity 111. It should be noted that when molding the injection-molded connector 150, the portion within the receiving groove 115 can be molded with an exposed mounting groove for connecting the pin end to the external structure.

[0031] Based on the above structural configuration, when configuring the injection-molded connector 150, the injection molding process ensures that the ignition tube 132 and igniter 131 of the ignition unit 130 are stably connected to the lower housing 113, improving its sealing performance. This includes a portion located in the inner cavity 111 and a portion located in the receiving groove 115. The receiving groove 115 enhances stability and prevents the injection-molded connector 150 from detaching. Furthermore, to improve connection stability and sealing performance, please refer to... Figures 1-8 The bottom of the receiving groove 115 is provided with a first connecting portion 116 and a second connecting portion 117 around the opening 114. The first connecting portion 116 is located inside the bottom of the receiving groove 115, and the second connecting portion 117 is located outside the bottom of the receiving groove 115; wherein, both the first connecting portion 116 and the second connecting portion 117 are grooves 118 (e.g., Figures 3-6 (as shown) or protrusion 119 (as shown) Figure 7 and Figure 8 (As shown).

[0032] It should be noted that, since the portion of the injection-molded connector 150 located in the inner cavity 111 extends into the ignition tube 132 and connects to it, it also abuts against the outer side of the bottom of the receiving groove 115 of the lower housing 113; while the portion of the injection-molded connector 150 located in the receiving groove 115 abuts against the inner side of the bottom of the receiving groove 115, in order to improve the connection stability of the injection-molded connector 150, the above-mentioned first connecting portion 116 and second connecting portion 117 are configured so that the outer and inner sides of the bottom of the receiving groove 115 of the injection-molded connector 150 can improve its connection stability and sealing performance through cooperation with the first connecting portion 116 and the second connecting portion 117. Furthermore, when the first connecting part 116 and the second connecting part 117 are configured, if both are set as grooves 118, the corresponding part of the injection-molded connector 150 extends into the groove 118 to cooperate with it. If it is a protrusion 119, the injection-molded connector 150 will be molded to accommodate the groove 119 during injection molding.

[0033] Furthermore, there are multiple ways to configure the first connecting part 116 and the second connecting part 117. When both the first connecting part 116 and the second connecting part 117 are set as grooves 118, the cross-section of the groove 118 is trapezoidal (e.g., Figure 4 As shown), polygons (such as) Figure 5 (as shown) or more than 1 / 2 of a circle (such as) Figure 3 As shown), the cross-sectional width of at least a portion of the groove 118 gradually increases from its opening to its bottom. Furthermore, the groove 118 can be an annular groove arranged around the axis of the opening 114. In addition, the groove 118 can be inclined relative to the axial direction of the housing 110 (e.g., Figure 6 As shown in the figure, it is formed into a slanted groove.

[0034] When both the first connecting portion 116 and the second connecting portion 117 are protrusions 119, the cross-section of the protrusion 119 is a circle exceeding 1 / 2 (e.g., Figure 7 (as shown), rectangles or triangles (such as) Figure 8 As shown in the figure, the width of at least a portion of the protrusion 119 gradually increases along the protrusion direction of the protrusion 119. Moreover, when arranging the protrusion 119, the protrusion 119 can also be inclined relative to the axial direction of the housing 110.

[0035] It should be noted that, based on the above-mentioned structure of the groove 118 and the protrusion 119, the width or shape of the groove 118 and the protrusion 119 can be varied to form an interlocking connection or a snap-fit ​​connection when connected with the injection molding connector 150, thereby improving the connection stability and sealing performance of the injection molding connector 150. Specifically, the cross-section of groove 118 is trapezoidal (e.g., Figure 4 As shown), polygons (such as) Figure 5 (as shown) and more than 1 / 2 of a circle (as shown) Figure 3 The shape shown is used as an example for explanation; like Figure 3 As shown, when the cross-section of the groove 118 is more than 1 / 2 of a circle, the width of the groove 118 gradually increases from the opening to the bottom of the groove 118 as it approaches the semi-circular position. The purpose of this is to ensure that the width of the opening of the groove 118, which is more than 1 / 2 of a circle, is less than the width of the groove 118 at the semi-circular position. This allows for interlocking or engaging with the injection molding connector 150 after connection, thereby improving the connection stability and sealing of the injection molding connector 150. like Figure 4 As shown, when the cross-section of the groove 118 is trapezoidal, because it adopts a direction from the opening to the bottom of the groove 118, the width of at least part of the groove 118 gradually increases. Figure 4 The middle section uses a section that gradually increases in width towards the bottom of the trapezoidal groove 118 at the opening position. The purpose is to make the width of the opening of the trapezoidal groove 118 smaller than the width of at least part of the area inside the groove 118, so that after being connected with the injection molding connector 150, an interlocking or locking mechanism can be formed, thereby improving the connection stability and sealing of the injection molding connector 150. like Figure 5 As shown, when the cross-section of the groove 118 is polygonal, the width of the groove 118 gradually increases from the opening to the bottom. The purpose is to make the width of the opening of the polygonal groove 118 smaller than the width of the rest of the groove, so that after it is connected with the injection molding connector 150, an interlocking or locking mechanism can be formed, thereby improving the connection stability and sealing of the injection molding connector 150. like Figure 6 As shown, when the groove 118 is inclined relative to the axial direction of the housing 110, it is inclined towards the axial direction of the receiving groove 115. Since the grooves 118 in this embodiment are all annular grooves arranged around the axis of the receiving groove 115, the inclined grooves 118 can form a corresponding interlocking structure. That is, by the angle of the two side walls of the groove 118, an interlocking or locking can be formed after connecting with the injection molding connector 150, thereby improving the connection stability and sealing of the injection molding connector 150. Similar to the shape of the groove 118 described above, when configuring the protrusion 119, the design aims to create an interlocking or locking mechanism after it is connected to the injection molding connector 150, thereby improving the connection stability and sealing of the injection molding connector 150. The specific design is the same as that of the groove 118 described above, so it will not be repeated here.

[0036] In addition to the structure described above, please refer to Figures 9-11 and combined Figures 1-8 Furthermore, the bottom of the receiving groove 115 can be provided with a bent portion 121 around the axis of the opening 114, and the injection-molded connector 150 covers the bent portion 121. Moreover, when the bent portion 121 is provided, it can be located at the edge of the opening 114 (e.g., Figure 9 and Figure 10 As shown), it can also be spaced from opening 114 (e.g. Figure 11 As shown), and arranged around the axis of the opening 114, the purpose of which is to make the injection molding connector 150 cover the bending part 121 during injection molding, thereby improving its connection stability and sealing performance and preventing it from falling off.

[0037] Furthermore, when configuring the bent portion 121, the bent portion 121 can be bent and extended toward the receiving groove 115 (e.g. Figure 9 (As shown), it can also be bent outwards toward the receiving groove 115 (as shown). Figure 10 As shown), during bending and forming, it can be bent either towards the inner cavity 111 or towards the receiving groove 115. Furthermore, during bending and forming, a groove 122 can be formed on the inner side of the bending portion 121. The groove 122 can also play the same role as the groove 118 mentioned above. That is, the groove 122 can form an interlock or engagement after being connected with the injection molding connector 150 through the structural setting of the bending portion 121, thereby improving the connection stability and sealing of the injection molding connector 150. Thus, when a part of the injection molding connector 150 is located in the groove 122 and cooperates with it, an interlock and engagement can be formed, thereby improving its connection stability and sealing and preventing it from falling off.

[0038] Based on the above, please refer to Figures 1-11The injection-molded connector 150 is injection molded. During the molding process, the injection-molded connector 150 and the igniter 131 covering the ignition unit 130 can cooperate with the receiving groove 115 of the lower housing 113, and can also extend into and connect to the ignition tube 132. Moreover, during the molding process, one or more of the aforementioned first connecting part 116, second connecting part 117, and bending part 121 can be arranged at the bottom of the receiving groove 115 of the lower housing 113, thereby enabling... In this method, a protrusion 119, a groove 118, or a bent structure can be formed at the bottom of the receiving groove 115. When forming the bent structure, a groove 122 can be formed on the inner side of the bent position. Thus, through the aforementioned structural arrangement, the injection-molded connector 150 can cover the inner or outer side of the bottom of the aforementioned formed receiving groove 115 during injection molding, thereby forming a mutual fit and interlocking effect, which can increase the connection fit, improve the connection stability, and enhance the sealing of the connection.

[0039] It should be noted that, through the above connection method, the ignition unit 130 is connected to the housing 110 by injection molding, which can improve the connection stability and sealing while reducing the welding connection of the gas generator 100 during the assembly process, thereby simplifying the assembly process and reducing the connection cost.

[0040] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A gas generator, characterized in that: The gas generator includes a housing, an ignition unit, and injection-molded connectors; The housing is provided with an inner cavity; the ignition unit includes an igniter and an ignition tube; the igniter is connected to the housing through the injection-molded connector, and the ignition end of the igniter protrudes from the injection-molded connector and extends into the ignition tube, and the pin end of the igniter protrudes from the injection-molded connector and extends out of the housing; the ignition tube is located in the inner cavity and is connected to the injection-molded connector.

2. The gas generator according to claim 1, characterized in that: The housing includes an upper housing and a lower housing, the upper housing and the lower housing are connected and together form the inner cavity; The lower housing has an opening that communicates with the inner cavity, and the injection-molded connector is connected to the opening.

3. The gas generator according to claim 2, characterized in that: The lower housing is provided with a receiving groove recessed towards the inner cavity, and the opening is formed at the bottom of the receiving groove; A portion of the injection-molded connector is housed within the receiving groove, while the remaining portion of the injection-molded connector extends into the inner cavity and is connected to the ignition tube.

4. The gas generator according to claim 3, characterized in that: The bottom of the receiving groove is provided with a first connecting part and a second connecting part around the opening. The first connecting part is located inside the bottom of the receiving groove, and the second connecting part is located outside the bottom of the receiving groove. Both the first connecting part and the second connecting part are grooves or protrusions.

5. The gas generator according to claim 4, characterized in that: Both the first connecting part and the second connecting part are grooves, and the cross-section of the groove is trapezoidal, polygonal, or more than 1 / 2 circle; In this groove, at least a portion of the cross-sectional width gradually increases from the opening of the groove towards its bottom.

6. The gas generator according to claim 5, characterized in that: The groove is inclined relative to the axial direction of the housing.

7. The gas generator according to claim 4, characterized in that: Both the first connecting part and the second connecting part are protrusions, and the cross-section of the protrusion is a circle, rectangle or triangle exceeding 1 / 2; Wherein, along the protruding direction of the protrusion, at least a portion of the width of the protrusion gradually increases.

8. The gas generator according to claim 7, characterized in that: The protrusion is inclined relative to the axial direction of the housing.

9. The gas generator according to claim 3, characterized in that: The bottom of the receiving groove is provided with a bent portion around the axis of the opening, and the injection-molded connector covers the bent portion.

10. The gas generator according to claim 9, characterized in that: The bent portion bends toward the inside or outside of the receiving groove, and the bent portion is formed with a groove.

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