Gas generator

Abstract

This utility model relates to the field of automotive airbag technology, specifically to a gas generator. A first housing and a second housing of the gas generator are connected to form a closed gas-generating cavity. The bottom of the first housing is recessed towards the gas-generating cavity, forming a positioning groove for accommodating an injection-molded body. A guide port communicating with the gas-generating cavity is provided at the bottom of the positioning groove. An ignition tube is placed within the gas-generating cavity, and a second portion extends into the ignition tube. An igniter is encased in the injection-molded body, and the ignition end of the igniter extends into the ignition tube. The pin end of the igniter passes through the guide port, exits the injection-molded body, and protrudes from the first housing. The inner wall of the positioning groove is provided with a first positioning part that mates with the injection-molded body. This gas generator has a simple structure, improves connection stability and sealing performance, simplifies the manufacturing process, and improves manufacturing efficiency.

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 safety systems, the gas generator is one of the core components of the airbag system. Currently, existing gas generators primarily assemble the ignition tube and lower housing through welding during the design and manufacturing process. However, this manufacturing method suffers from problems such as poor connection stability, inadequate sealing, complex manufacturing processes, and low efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a gas generator with a simple structure, which can improve connection stability and sealing performance, and can simplify the manufacturing process and improve manufacturing efficiency.

[0004] The embodiments of this utility model can be implemented as follows:

[0005] This utility model provides a gas generator, which includes a first housing, a second housing, an injection molded body, an ignition tube, and an igniter;

[0006] The first housing and the second housing are connected to form a closed gas-generating cavity; the bottom of the first housing is recessed in the direction of the gas-generating cavity to form a positioning groove for accommodating the injection molded body, and a guide port communicating with the gas-generating cavity is opened at the bottom of the positioning groove.

[0007] The injection molded body includes a first portion placed in a positioning groove and a second portion located in a gas-generating cavity, the first portion being connected to the second portion; the ignition tube is placed in the gas-generating cavity, and the second portion extends into the ignition tube;

[0008] The igniter is encased in the injection-molded body, and the ignition end of the igniter extends into the ignition tube. The pin end of the igniter passes through the guide port, and extends out of the injection-molded body and out of the first housing.

[0009] The inner wall of the positioning groove is provided with a first positioning part that mates with the injection molded body.

[0010] In an optional embodiment, at least one annular groove is provided in the area where the inner wall of the ignition tube contacts the injection molded body, and the annular groove is arranged around the axis of the ignition tube.

[0011] In an optional embodiment, the first positioning part is disposed on the inner side of the bottom of the positioning groove or on the inner sidewall of the positioning groove.

[0012] In an optional embodiment, an arc-shaped transition chamfer is provided at the boundary between the first positioning part and the inner wall of the positioning groove.

[0013] In an optional embodiment, the first positioning part includes a first protrusion arranged annularly around the axis of the positioning groove or a plurality of first protrusions spaced apart around the axis of the positioning groove.

[0014] The first protrusion has a cross-sectional shape of triangle, rectangle, trapezoid, or semicircle, and its width gradually decreases along the protruding direction of the first protrusion.

[0015] In an optional embodiment, the first positioning part includes a first groove arranged annularly around the axis of the positioning groove or a plurality of first grooves spaced apart around the axis of the positioning groove.

[0016] The cross-sectional shape of the first groove is triangular, rectangular, trapezoidal or semi-circular, and its width gradually decreases along the concave direction of the first groove.

[0017] In an optional embodiment, a second positioning part that mates with the injection molded body is disposed on the inner wall of the first housing in the area opposite the bottom of the positioning groove.

[0018] In an optional embodiment, an arc-shaped transition chamfer is provided at the boundary between the second positioning part and the inner wall of the first housing.

[0019] In an optional embodiment, the second positioning part includes a second protrusion arranged annularly around the axis of the positioning groove or a plurality of second protrusions spaced apart around the axis of the positioning groove.

[0020] The cross-sectional shape of the second protrusion is triangular, rectangular, trapezoidal or semi-circular, and its width gradually decreases along the protruding direction of the second protrusion.

[0021] In an optional embodiment, the second positioning part includes a second groove arranged circumferentially around the axis of the positioning groove or a plurality of second grooves spaced apart around the axis of the positioning groove.

[0022] The cross-sectional shape of the second groove is triangular, rectangular, trapezoidal or semi-circular, and its width gradually decreases along the concave direction of the second groove.

[0023] The beneficial effects of the gas generator provided in this embodiment of the present invention include:

[0024] The gas generator includes a first housing, a second housing, an injection-molded body, an ignition tube, and an igniter. The first housing and the second housing are connected to form a closed gas-generating cavity. The bottom of the first housing is recessed towards the gas-generating cavity, forming a positioning groove for accommodating the injection-molded body. The bottom of the positioning groove has a through-hole communicating with the gas-generating cavity. The injection-molded body includes a first portion placed in the positioning groove and a second portion located in the gas-generating cavity, with the first portion connected to the second portion. The ignition tube is placed in the gas-generating cavity, and the second portion extends into the ignition tube. The igniter is covered by the injection-molded body, and the ignition end of the igniter extends into the ignition tube. The pin end of the igniter passes through the through-hole, exits the injection-molded body, and protrudes from the first housing. The inner wall of the positioning groove has a first positioning part that mates with the injection-molded body. This gas generator has a simple structure, improves connection stability and sealing performance, simplifies manufacturing processes, and increases manufacturing efficiency. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the gas generator provided in this embodiment;

[0027] Figure 2 This is a schematic diagram of the structure of the first housing and injection molded body provided in this embodiment when the first positioning part and the second positioning part are protruding structures;

[0028] Figure 3 This is a schematic diagram of the structure of the first housing provided in this embodiment when the first positioning part and the second positioning part are protruding structures;

[0029] Figure 4 This is a schematic diagram of the ignition tube provided in this embodiment;

[0030] Figure 5 This is a schematic diagram of the structure of the first housing and injection molded body provided in this embodiment when the first positioning part and the second positioning part are groove structures;

[0031] Figure 6 This is a schematic diagram of the structure of the first housing provided in this embodiment when the first positioning part and the second positioning part are groove structures.

[0032] Icons: 100-Gas generator; 110-First housing; 120-Second housing; 130-Injection molded body; 140-Ignition tube; 150-Igniter; 101-Gas generation cavity; 111-Positioning groove; 112-Conducting port; 131-First section; 132-Second section; 113-First positioning part; 141-Annular groove; 114-First protrusion; 115-First groove; 116-Second positioning part; 117-Second protrusion; 118-Second groove. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] 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.

[0039] Please refer to Figures 1-3This embodiment provides a gas generator 100, which includes a first housing 110, a second housing 120, an injection molded body 130, an ignition tube 140, and an igniter 150.

[0040] The first housing 110 and the second housing 120 are connected to form a closed gas-generating inner cavity 101; the bottom of the first housing 110 is recessed in the direction of the gas-generating inner cavity 101 to form a positioning groove 111 for accommodating the injection molded body 130, and a guide port 112 communicating with the gas-generating inner cavity 101 is provided at the bottom of the positioning groove 111.

[0041] The injection molded body 130 includes a first portion 131 placed in the positioning groove 111 and a second portion 132 located in the gas-generating inner cavity 101, the first portion 131 and the second portion 132 being connected; the ignition tube 140 is placed in the gas-generating inner cavity 101, and the second portion 132 extends into the ignition tube 140.

[0042] Igniter 150 is covered by injection molding body 130, and the ignition end of igniter 150 extends into ignition tube 140. The pin end of igniter 150 passes through the through port 112, and extends out of the injection molding body 130 and out of the first housing 110.

[0043] The inner wall of the positioning groove 111 is provided with a first positioning part 113 that cooperates with the injection molded body 130.

[0044] Please refer to Figures 1-3 The working principle of the gas generator 100 is as follows:

[0045] The gas generator 100 includes a first housing 110, a second housing 120, an injection molded body 130, an ignition tube 140, and an igniter 150; the first housing 110 and the second housing 120 are connected to form a closed gas-generating inner cavity 101; the gas-generating inner cavity 101 is used to contain the gas-generating drug;

[0046] The bottom of the first housing 110 is recessed towards the gas-generating inner cavity 101 to form a positioning groove 111 for accommodating the injection molded body 130. The bottom of the positioning groove 111 is provided with a guide port 112 that communicates with the gas-generating inner cavity 101.

[0047] The injection molded body 130 includes a first portion 131 placed in the positioning groove 111 and a second portion 132 located in the gas-generating inner cavity 101, the first portion 131 and the second portion 132 being connected; the ignition tube 140 is placed in the gas-generating inner cavity 101, and the second portion 132 extends into the ignition tube 140; the igniter 150 is covered by the injection molded body 130, and the ignition end of the igniter 150 extends into the ignition tube 140, the pin end of the igniter 150 passes through the guide port 112, and extends out of the injection molded body 130 and out of the first housing 110; the ignition tube 140 is used to contain the ignition propellant, and the ignition propellant contacts the igniter 150 located in the ignition tube 140; wherein, the inner wall of the positioning groove 111 is provided with a first positioning part 113 that cooperates with the injection molded body 130.

[0048] Therefore, through the above-described structural arrangement, the igniter 150 can be connected to the first housing 110 by the injection-molded body 130. Furthermore, since the first housing 110 has a positioning groove 111 formed therein, and a first positioning part 113 is arranged on the inner wall of the positioning groove 111, the connection stability between the injection-molded body 130 and the first housing 110 can be improved in this way. Moreover, the positioning groove 111 increases the contact area between it and the injection-molded body 130, and the cooperation between the first positioning part 113 on its inner wall and the injection-molded body 130 can improve the overall sealing performance.

[0049] Therefore, the above-described injection-molded body 130 configuration method, compared with the existing welding connection method of the igniter 150, has a simpler structure, a simpler and more convenient manufacturing process, can improve connection stability and sealing performance, and can simplify the manufacturing process and improve manufacturing efficiency.

[0050] Furthermore, based on the above structure, when configuring the positioning groove 111, the contour of the groove wall of the positioning groove 111 can be adjusted according to actual needs. That is, the inner diameter of the positioning groove 111 can change with its depth. For example, its inner diameter can gradually decrease from the bottom of the groove to the opening of the groove, thereby increasing its anti-detachment performance, improving the connection stability of the injection molded body 130, and increasing the contact area with the injection molded body 130, thereby improving the connection stability and sealing performance.

[0051] Based on the aforementioned internal design, a portion of the injection-molded body 130 is located within the gas-generating cavity 101. Therefore, to improve the connection stability between it and the ignition tube 140, as follows... Figure 4As shown, at least one annular groove 141 is provided in the area where the inner wall of the ignition tube 140 contacts the injection molded body 130. The annular groove 141 is arranged around the axis of the ignition tube 140. In this way, the contact area between the ignition tube 140 and the injection molded body 130 and the annular groove 141 are matched to increase the anti-detachment performance, thereby improving the connection stability and sealing performance.

[0052] Furthermore, when configuring the first positioning part 113 as described above, the first positioning part 113 can be disposed on the inner side of the bottom of the positioning groove 111 or on the inner sidewall of the positioning groove 111 as required. In this way, the contact area with the injection molded body 130 can be increased. Alternatively, the first positioning part 113 can be disposed on both the bottom and the sidewall of the positioning groove 111.

[0053] When configuring the first positioning unit 113, please refer to... Figures 1-6 It can be set as a groove or a protrusion, and to improve its connection stability, an arc-shaped transition chamfer is provided at the boundary between the first positioning part 113 and the inner wall of the positioning groove 111.

[0054] Please refer to Figures 1-3 When the first positioning part 113 is configured as a protruding structure, its structure is as follows:

[0055] The first positioning part 113 includes a first protrusion 114 arranged in a ring around the axis of the positioning groove 111 or a plurality of first protrusions 114 spaced apart around the axis of the positioning groove 111.

[0056] It should be noted that when there is only one first protrusion 114, it can be a continuous annular protrusion arranged around the axis of the positioning groove 111; while when there are multiple protrusions, they can be arranged at intervals around the axis of the positioning groove 111.

[0057] Furthermore, the shape of the first protrusion 114 can have various structural styles. Taking its cross-sectional shape as an example, the cross-sectional shape of the first protrusion 114 can be triangular, rectangular, trapezoidal or semi-circular. In addition, it can also be other types of shapes. In order to improve the connection stability between it and the injection molded body 130, its width can gradually decrease along the protrusion direction of the first protrusion 114. This method can increase the contact area between the injection molded body 130 and the first protrusion 114, thereby improving its connection stability and sealing performance.

[0058] like Figure 5 and Figure 6 As shown, when the first positioning part 113 is configured as a recessed structure, its structure is as follows:

[0059] The first positioning part 113 includes a first groove 115 arranged in a ring around the axis of the positioning groove 111 or a plurality of first grooves 115 arranged at intervals around the axis of the positioning groove 111.

[0060] It should be noted that when there is only one first groove 115, it can be a continuous annular groove arranged around the axis of the positioning groove 111; while when there are multiple grooves, they can be arranged at intervals around the axis of the positioning groove 111.

[0061] Furthermore, the cross-sectional shape of the first groove 115 is triangular, rectangular, trapezoidal or semi-circular, and it can also be other types of shapes; and in order to improve the connection stability between it and the injection molded body 130, its width can gradually decrease along the concave direction of the first groove 115.

[0062] Please refer to Figures 1-6 Based on the above structure, a second positioning part 116 that mates with the injection-molded body 130 can also be disposed on the inner wall of the first housing 110 in the area directly opposite the bottom of the positioning groove 111. It should also be noted that since the part of the main body located in the gas-generating cavity 101 is located inside the ignition tube 140, when the second positioning part 116 is disposed, it must be located in the area of ​​the first housing 110 directly opposite the ignition tube 140.

[0063] Furthermore, in order to improve the connection stability between the second positioning part 116 and the injection molded body 130, an arc-shaped transition chamfer is provided at the critical point between the second positioning part 116 and the inner wall of the first housing 110.

[0064] Furthermore, the second positioning part 116 can be configured as a groove structure or a protrusion structure. Specifically, when the second positioning part 116 is a protrusion structure, such as... Figure 2 and Figure 3 As shown, the second positioning part 116 includes a second protrusion 117 arranged annularly around the axis of the positioning groove 111, or a plurality of second protrusions 117 spaced apart around the axis of the positioning groove 111. It should be noted that when there is only one second protrusion 117, it can be a continuous protrusion arranged around the axis of the positioning groove 111; when there are multiple protrusions, they can be arranged annularly spaced around the axis of the positioning groove 111. Moreover, the cross-sectional shape of the second protrusion 117 can be triangular, rectangular, trapezoidal, or semi-circular, or other shapes can be used. Furthermore, in order to increase the contact area between the injection molded body 130 and the second protrusion 117, the width of the second protrusion 117 gradually decreases along the protrusion direction.

[0065] When the second positioning part 116 is a groove structure, such as Figure 5 and Figure 6As shown, the second positioning part 116 includes a second groove 118 arranged annularly around the axis of the positioning groove 111, or a plurality of second grooves 118 spaced apart around the axis of the positioning groove 111. It should be noted that when there is only one second groove 118, it can be a continuous groove arranged around the axis of the positioning groove 111; when there are multiple grooves, they can be arranged annularly spaced around the axis of the positioning groove 111. Moreover, the cross-sectional shape of the second groove 118 can be triangular, rectangular, trapezoidal, or semi-circular, or other shapes can be used. In addition, to increase the contact area between the injection molded body 130 and the second groove 118, the width of the second groove 118 gradually decreases along the concave direction.

[0066] It should be noted that when configuring the first positioning unit 113 and the second positioning unit 116, one of them can be set according to the requirements, or the first positioning unit 113 and the second positioning unit 116 can be set simultaneously according to the requirements.

[0067] 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 first housing, a second housing, an injection molded body, an ignition tube, and an igniter; The first housing and the second housing are connected to form a closed gas-generating cavity; the bottom of the first housing is recessed towards the gas-generating cavity to form a positioning groove for accommodating the injection molded body, and the bottom of the positioning groove is provided with a guide port communicating with the gas-generating cavity; The injection-molded body includes a first portion placed in the positioning groove and a second portion located in the gas-generating cavity, the first portion being connected to the second portion; the ignition tube is placed in the gas-generating cavity, and the second portion extends into the ignition tube; The igniter is encased in the injection-molded body, and the ignition end of the igniter extends into the ignition tube. The pin end of the igniter passes through the through-hole, and extends out of the injection-molded body and out of the first housing. The inner wall of the positioning groove is provided with a first positioning part that cooperates with the injection molded body.

2. The gas generator according to claim 1, characterized in that: The inner wall of the ignition tube has at least one annular groove in the area where it contacts the injection molded body, and the annular groove is arranged around the axis of the ignition tube.

3. The gas generator according to claim 1, characterized in that: The first positioning part is disposed on the inner side of the bottom of the positioning groove or on the inner sidewall of the positioning groove.

4. The gas generator according to claim 3, characterized in that: An arc-shaped transition chamfer is provided at the boundary between the first positioning part and the inner wall of the positioning groove.

5. The gas generator according to claim 3, characterized in that: The first positioning part includes a first protrusion arranged in a ring around the axis of the positioning groove or a plurality of first protrusions spaced apart around the axis of the positioning groove. The first protrusion has a cross-sectional shape of triangle, rectangle, trapezoid or semicircle, and its width gradually decreases along the protruding direction of the first protrusion.

6. The gas generator according to claim 3, characterized in that: The first positioning part includes a first groove arranged in a ring around the axis of the positioning groove or a plurality of first grooves arranged at intervals around the axis of the positioning groove. The first groove has a cross-sectional shape of triangle, rectangle, trapezoid or semicircle, and its width gradually decreases along the concave direction of the first groove.

7. The gas generator according to any one of claims 1-6, characterized in that: The inner wall of the first housing is provided with a second positioning part that mates with the injection molded body in the area opposite to the bottom of the positioning groove.

8. The gas generator according to claim 7, characterized in that: The second positioning part has an arc-shaped transition chamfer at the boundary between it and the inner wall of the first housing.

9. The gas generator according to claim 7, characterized in that: The second positioning part includes a second protrusion arranged in a ring around the axis of the positioning groove or a plurality of second protrusions spaced apart around the axis of the positioning groove. The cross-sectional shape of the second protrusion is triangular, rectangular, trapezoidal or semi-circular, and its width gradually decreases along the protruding direction of the second protrusion.

10. The gas generator according to claim 7, characterized in that: The second positioning part includes a second groove arranged in a ring around the axis of the positioning groove or a plurality of second grooves spaced apart around the axis of the positioning groove; The cross-sectional shape of the second groove is triangular, rectangular, trapezoidal or semi-circular, and its width gradually decreases along the concave direction of the second groove.

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