Gas guide assembly for columnar gas generator

Abstract

The utility model relates to the field of automobile safety, in particular to a gas guide assembly for a columnar gas generator, which comprises a columnar gas generator body, and the axial forward end of the columnar gas generator body is of a step shaft-mounted structure and sequentially comprises a third column body, a second column body and a first column body from inside to outside. A plurality of radial air outlet holes are circumferentially distributed in the surface of the first column body; the third column body, the second column body and the first column body are sleeved with a flow guide sleeve with the outer end open, and the flow guide sleeve wraps the periphery of the radial air outlet hole to form a flow guide cavity. Compared with the prior art, the air bag has the advantages that air generated by the air generator flows out of the radial air outlet hole to the flow guide cavity and then flows out of the opening in the outer end of the flow guide sleeve rightwards, and the air bag is prevented from being impacted and damaged due to direct radial exhaust of the air generator.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile safety, in particular to a gas guide component for a columnar gas generator. Background Art

[0002] Airbags are a crucial component of automotive safety systems, providing collision protection for occupants. Columnar inflators are a crucial component of the airbag module assembly and are typically used in curtain airbags located on the vehicle's side rails, the interior of the ceiling, or in side and distal airbags installed in the seatbacks. The inflator's outlet structure is typically located within the airbag. When a side collision occurs with an obstacle, the airbag system activates, the inflator is activated, and gas rapidly flows into the airbag, causing it to instantly deploy and form a flexible, cushioning element to protect the front and rear passengers.

[0003] The gas outlet structure of a cylindrical gas generator is generally distributed at the axial end, with multiple radial gas outlet holes distributed around the circumference of the cylinder. As a result, the gas flows out of the gas generator radially. In order to solve the thrust balance during the gas outlet process, the gas outlet holes are usually evenly distributed along the circumference. During the process of inflating the airbag in the airbag by such a gas generator, the radially outflowing gas has a strong impact force and heat load. Therefore, the bag body of the airbag must be protected from the impact force and heat load to avoid damage to the airbag and additional harm to the occupants. Utility Model Content

[0004] In response to the above problems, an embodiment of the present utility model provides a gas guide assembly for a columnar gas generator.

[0005] An embodiment of the present utility model provides an air guide assembly for a columnar gas generator, including a columnar gas generator body, the axial positive end of the columnar gas generator body is a stepped shaft-mounted structure, which comprises, from the inside to the outside, a third column, a second column and a first column, and a surface of the first column is circumferentially distributed with a plurality of radial air outlet holes; the third column, the second column and the first column are provided with a guide sleeve with an outer end opening, and the guide sleeve is wrapped around the periphery of the radial air outlet to form a guide cavity.

[0006] Compared with the prior art, the beneficial effect of the present invention is that the gas generated by the gas generator flows out from the radial outlet hole to the guide cavity, and then flows out to the right from the outer end opening of the guide sleeve, preventing the direct radial exhaust of the gas generator from causing impact damage to the air bag.

[0007] Optionally, a positioning protrusion is provided on the guide sleeve and located in the middle area, and the positioning protrusion is in contact with the surface of the first cylinder to limit the axial position.

[0008] Optionally, the positioning protrusion includes a left positioning protrusion and a right positioning protrusion that are symmetrically arranged.

[0009] Optionally, the diameter of the third column is smaller than the diameters of the second column and the cylindrical gas generator body, thereby forming an annular crimping process groove.

[0010] Optionally, the mounting opening at the inner end of the guide sleeve is tightly fitted with the second column, and the mounting opening is spun into the surface of the second column and the annular pressing process groove.

[0011] Optionally, the guide sleeve, the third column, the second column, the first column and the cylindrical gas generator body are coaxially arranged.

[0012] Optionally, the edge of the outer opening of the guide sleeve is in an irregular arc shape.

[0013] Optionally, an opening is provided on the circumferential surface of the guide sleeve and the opening is shaped and flanged to form a radial guide port and a guide vane, and the areas of the radial guide port and the opening at the outer end of the guide sleeve are different.

[0014] Optionally, the radial guide port faces one side of the cylindrical gas generator body.

[0015] Optionally, the angle between the guide vane and the axis of the guide sleeve is 30-40 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a gas guide assembly for a columnar gas generator provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the main structure of a gas guide assembly for a columnar gas generator provided by the utility model;

[0019] Figure 3 for Figure 2 AA-axis cross-sectional structural diagram;

[0020] Figure 4 A schematic side view of the structure of a gas guide assembly for a columnar gas generator provided by the present invention;

[0021] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0022] Figure 6 A schematic diagram of the three-dimensional structure of a columnar gas generator body provided by the utility model;

[0023] Figure 7 A schematic diagram of the three-dimensional structure of a guide sleeve provided by the utility model Figure 1 ;

[0024] Figure 8 A schematic diagram of the three-dimensional structure of a guide sleeve provided by the utility model Figure 2 .

[0025] Among them, 1. Columnar gas generator body; 101. First column; 102. Second column; 103. Third column; 105. Radial air outlet; 2. Guide sleeve; 201. Outer end opening; 202. Radial guide port; 203. Guide vane; 204. Left positioning protrusion; 205. Right positioning protrusion; 206. Mounting port; 3. Guide cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the schematic embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0027] See also Figures 1-8 An embodiment of the present invention provides a gas guide assembly for a columnar gas generator, including a columnar gas generator body 1. The axial positive end of the columnar gas generator body 1 is a stepped shaft-mounted structure, which comprises, from the inside to the outside, a third column 103, a second column 102 and a first column 101. A plurality of radial air outlet holes 105 are circumferentially distributed on the surface of the first column 101; a guide sleeve 2 with an outer end opening 201 is provided on the third column 103, the second column 102 and the first column 101, and the guide sleeve 2 is wrapped around the outer periphery of the radial air outlet hole 105 to form a guide cavity 3.

[0028] In practice, the guide sleeve 2 can be made by stretching, punching and expanding a plate, or made of a steel pipe.

[0029] A positioning protrusion is provided on the guide sleeve 2 and in the middle area. The positioning protrusion is in contact with the surface of the first column 101 to limit the axial position.

[0030] In practice, the positioning protrusions include a left positioning protrusion 204 and a right positioning protrusion 205 that are symmetrically arranged.

[0031] In practice, the diameter of the third column 103 is smaller than the diameters of the second column 102 and the cylindrical gas generator body 1 , thereby forming an annular pressing process groove.

[0032] In practice, the installation opening 206 at the inner end of the guide sleeve 2 is tightly fitted with the second column 102 , and the installation opening 206 is spun on the surface of the second column 102 and in the annular pressing process groove.

[0033] In practice, the flow guide sleeve 2 , the third column 103 , the second column 102 , the first column 101 and the cylindrical gas generator body 1 are coaxially arranged.

[0034] In practice, the edge of the outer opening 201 of the guide sleeve 2 is in an irregular arc shape.

[0035] During implementation, an opening is provided on the circumferential surface of the guide sleeve 2 and the opening is shaped and flanged to form a radial guide port 202 and a guide vane 203. The guide vane 203 forms an arc-shaped guide groove. The radial guide port 202 and the opening 201 at the outer end of the guide sleeve 2 have different areas, thereby achieving different distribution ratios of the front and rear air outlets.

[0036] In practice, the radial guide port 202 faces one side of the cylindrical gas generator body 1 .

[0037] In practice, the angle between the guide vane 203 and the axis of the guide sleeve 2 is 30-40 degrees, preferably 35 degrees.

[0038] When the vehicle collides with an obstacle during driving, the gas generated by the gas generator flows out from the radial outlet hole 105 into the guide cavity 3. Part of the gas is guided by the inner wall of the guide cavity 3 and diverted to the right to flow out from the outer end opening 201. The other part of the gas flows out from the radial guide port 202 along the guide groove formed by the guide plate 203, thereby decomposing the high pressure accumulated inside the guide cavity 3, maintaining the balance of the outlet thrust, and avoiding the impact damage to the airbag caused by direct radial exhaust of the gas generator.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A gas guide assembly for a cylindrical gas generator, comprising a cylindrical gas generator body, characterized in that: The axial positive end of the cylindrical gas generator body is a stepped shaft-mounted structure, which includes, from the inside to the outside, the third cylinder, the second cylinder and the first cylinder. The surface of the first cylinder is circumferentially distributed with several radial air outlet holes. The third cylinder, the second cylinder and the first cylinder are provided with a guide sleeve with an open outer end, and the guide sleeve is wrapped around the outer periphery of the radial air outlet to form a guide cavity.

2. The gas guide assembly for a cylindrical gas generator according to claim 1, characterized in that: A positioning protrusion is provided on the guide sleeve and in the middle area. The positioning protrusion is fitted with the surface of the first column to limit the axial position.

3. The gas guide assembly for a cylindrical gas generator according to claim 2, characterized in that: The positioning protrusions include a left positioning protrusion and a right positioning protrusion that are symmetrically arranged.

4. The gas guide assembly for a cylindrical gas generator according to claim 1, wherein: The diameter of the third column is smaller than the diameter of the second column and the columnar gas generator body, thereby forming an annular pressing process groove.

5. The gas guide assembly for a cylindrical gas generator according to claim 4, characterized in that: The installation opening at the inner end of the guide sleeve is tightly fitted with the second column, and the installation opening is spun on the surface of the second column and in the annular pressing process groove.

6. The gas guide assembly for a cylindrical gas generator according to claim 1, wherein: The guide sleeve, the third column, the second column, the first column and the columnar gas generator body are coaxially arranged.

7. The gas guide assembly for a cylindrical gas generator according to claim 1, wherein: The edge of the outer opening of the guide sleeve is in an irregular arc shape.

8. The gas guide assembly for a cylindrical gas generator according to claim 1, wherein: An opening is provided on the circumference of the guide sleeve and the opening is shaped and flanged to form a radial guide port and a guide vane. The radial guide port and the opening at the outer end of the guide sleeve have different areas.

9. The gas guide assembly for a cylindrical gas generator according to claim 8, characterized in that: The radial guide port faces one side of the cylindrical gas generator body.

10. The gas guide assembly for a cylindrical gas generator according to claim 9, characterized in that: The included angle between the guide vane and the guide sleeve axis is 30-40 degrees.

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