A trigger device

Abstract

The present application relates to a kind of trigger device, including shell assembly, locking rod and igniter, shell assembly includes hollow tube body, locking rod includes piston part being contained in tube body and locking portion extending to tube body outside, igniter is used to inject high-pressure gas to sealed cavity to push piston part, make locking rod move from first position to second position, locking rod is kept in first position by limiting device, opening is provided on tube body for igniter installation and / or for high-pressure gas enters sealed cavity, and for limiting device is inserted and is embedded with locking rod after insertion hole, shell assembly further includes plastic package, plastic package is configured to cover the tube body periphery in the periphery, fix igniter on tube body and cover opening, insertion hole and limiting device.According to the trigger device of the present application, the installation process of the igniter is simplified, so that the manufacture is simple, reduces assembly process, so as to reduce production cost;Limiting device is embedded with locking rod after being inserted into insertion hole, and then together plastic package is covered and is shaped, which provides visual assembly method, improves the stability of product.

Description

Technical Field

[0001] This manual relates to the field of vehicle safety accessories technology, specifically to a triggering device. Background Technology

[0002] During the use of zero-gravity seats, the angle of retraction is greater than in normal seats. In the event of a collision, this increases the risk of seatbelt strangulation and excessive spinal injuries. Integrating a collision reset mechanism into the seat is a common passive safety solution for zero-gravity seats, and a pyrotechnic seat unlocker is an essential component. The unlocker releases the seat back from its locking position, allowing the reset mechanism to move the backrest to the designated location.

[0003] A pyrotechnic unlocking device typically uses an igniter to move a piston inside the housing from the locked position to the unlocked position, thereby releasing the seat back from its lock. Traditional igniters are usually riveted or threaded onto the housing as separate components, which not only complicates the installation process and increases installation time, but also poses a risk of leakage at the connection point.

[0004] In addition, the piston needs a limit device to keep it in the locked position to prevent it from sliding to the unlocked position when not actuated. However, traditional limit devices are usually located inside the housing. Since they are not easy to observe, they are prone to being improperly installed during the installation process, which causes the limit device to lose its function and affects the normal use of the unlocker. Summary of the Invention

[0005] In view of this, embodiments of this specification provide a low-cost, platform-based, and highly reliable unlocker for adjusting vehicle seat backrests, solving the aforementioned problems existing in traditional structures.

[0006] This specification provides the following technical solution in its embodiments: A triggering device includes a housing assembly, a locking rod, and an igniter. The housing assembly includes a hollow tube. The locking rod includes a piston portion housed within the tube and a locking portion extending outside the tube. The end face of the piston portion forms a sealed cavity with the inner wall of the tube and the rod portion of the locking rod. The igniter injects high-pressure gas into the sealed cavity to push the piston portion, causing the locking rod to move from a first position to a second position. The locking rod is held in the first position by a limiting device. The tube has an opening for installing the igniter and / or for high-pressure gas to enter the sealed cavity, and an insertion hole for the limiting device to engage with the locking rod after insertion. The housing assembly also includes a plastic coating, which is configured to cover the outer periphery of the tube in the circumferential direction, fixing the igniter to the tube and covering the opening, the insertion hole, and the limiting device.

[0007] Preferably, the locking rod is provided with a circumferential groove, and the limiting device passes through the insertion hole and is embedded in the circumferential groove.

[0008] Preferably, the tube body is also provided with several sunken weight-reducing blind holes, the insertion hole is located in any one of the weight-reducing blind holes, and the plastic coating covers the weight-reducing blind holes in the circumferential direction.

[0009] Preferably, the limiting device is a bolt, and the inner wall of the insertion hole is provided with a threaded structure.

[0010] Preferably, the plastic coating body has a connector on the outer periphery of the tube at the axial position where the circumferential opening is located, for mounting a connector device for electrical connection with the igniter.

[0011] Preferably, the tube body has a base extending away from the sealed cavity around the opening, the base has a flat end face, the igniter includes a gas generating body, a flange portion surrounding the gas generating body, and a lead pin electrically connected to the gas generating body, the flange portion overlaps on the flat end face, and the plastic coating covers the base, flange portion and gas generating body to form a connector, one end of the lead pin extends into the connector.

[0012] Preferably, an annular flange is provided on the outer periphery of the tube, and the plastic coating extends axially to the end face of the annular flange and / or across the annular flange.

[0013] Preferably, a receiving structure is formed inside the connector to receive a shorting clip that mates with the pin.

[0014] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0015] The plastic-coated body simplifies the igniter installation process, making manufacturing simpler, reducing assembly steps, and thus lowering production costs. The limiting device, after fitting, is also plastic-coated, providing a visible assembly method and improving product stability. The design of the annular flange and base effectively enhances the shear resistance and reliability of the plastic-coated body. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of the triggering device of the present invention.

[0018] Figure 2 This is an exploded view of the triggering device of the present invention.

[0019] Figure 3 These are a top view and a cross-sectional view along plane AA of the triggering device of the present invention when the locking lever is in the first position.

[0020] Figure 4 These are a top view and a cross-sectional view along the CC plane of the triggering device of the present invention when the locking lever is in the second position.

[0021] Figure 5 This is a side view of the triggering device of the present invention when the locking lever is in the first position, a cross-sectional view along the BB plane, a cross-sectional view along the EE plane, and a partial enlarged view of F.

[0022] Figure 6 This is a side view of the triggering device of the present invention when the locking lever is in the second position, and a cross-sectional view along the DD plane.

[0023] Figure 7 This is an exploded view of the housing assembly of the triggering device of the present invention, excluding the plastic coating.

[0024] Figure 8 This is a first state view of the triggering device assembly of the present invention.

[0025] Figure 9 This is a second state view of the triggering device assembly of the present invention.

[0026] Figure 10 This is a third state view of the triggering device assembly of the present invention.

[0027] In the attached figures, the following are the reference numerals: 10. Shell assembly; 11. Plate-shaped support; 111. Connecting hole; 112. Mounting hole; 12. First tube body; 121. Guide section; 122. Mounting section; 123. Opening; 1231. Base; 1232. Flat end face; 124. Weight-reducing blind hole; 125. Insertion hole; 126. Annular flange; 127. Limiting device; 128. Drop position; 13. Second tube body; 131. Flange structure; 14. Plastic-coated body; 141. Connecting port; 15. Tube body; 20. Igniter; 21. Gas generating body; 22. Flange; 23. Lead pin; 24. Short-circuit clamp; 30. Locking rod; 31. Locking part; 32. Piston part; 33. Circumferential annular groove; 34. First sealing ring; 35. Second sealing ring; 36. Plug. Detailed Implementation

[0028] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0029] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0031] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0032] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0033] like Figure 3 and Figure 4As shown, the triggering device includes a locking lever movable between a first position and a second position. The locking lever is used to insert or pull out between the first and second components to be activated, to establish at least a partial locking connection or to allow relative movement between the first and second components. In the field of vehicle seat applications, the triggering device is used to lock or unlock the seat back to adjust the tilt angle of the backrest relative to the seat cushion. The first and second components, which are fixedly connected to the seat cushion and the backrest respectively, are in a relative rotational relationship. This results in a shear force perpendicular to the axial direction of the locking lever being applied during both insertion and removal of the locking lever. In collision conditions with a seat back reset function, i.e., after the triggering device is unlocked, the backrest resets to the predetermined position. Due to different ignition timing or customer redundancy requirements, this shear force tends to increase, for example, from 20KN to 42KN. This causes deformation of the triggering device housing in traditional structures and has a significant impact on the sealing system, making it impossible to complete the insertion or removal of the locking lever.

[0034] In addition, the traditional triggering device uses an independent igniter socket design, which makes the installation process complicated, increases production costs, and there is also the possibility of the limit device not being properly assembled.

[0035] Based on this, the inventors conducted extensive and in-depth experiments and designed a low-cost, platform-based triggering device. It uses a tube with high deformation resistance to solve the adverse effects caused by shear force; it sets up a plastic-coated body to fix the igniter and seal the venting point; it provides a visual installation environment for the limit device; the overall device simplifies the installation process and greatly reduces production costs.

[0036] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0037] like Figure 1-4 As shown, the triggering device includes a housing assembly 10, a locking lever 30, and an igniter 20. The housing assembly 10 includes a hollow tube 15. The locking lever 30 includes a piston portion 32 housed within the tube 15 and a locking portion 31 extending outside the tube. One end of the tube 15 has a guide section 121 that allows the locking portion 31 to pass through but prevents the piston portion 32 from passing through. The locking lever 30 is preferably an integrated component, with one end having a smaller diameter that extends through the opening of the guide section 121 to form the locking portion 31, and the other end having a larger diameter that fits against the inner wall of the tube 15 to form the piston portion 32. The lever portion of the locking lever 30 is held in a first position by a limiting device 127, and the other end of the tube 15 is sealed by a cap 36.

[0038] When the locking lever 30 is in the first position, a sealed cavity is formed between the end face of the piston part 32, the inner wall of the tube body 15, and the rod part of the locking lever 30. The igniter 20 receives the ignition signal from the controller and injects high-pressure gas into the sealed cavity to push the piston part 32, causing it to tend to move away from the locking part 31. After the limiting device 127 is cut off, the locking lever 30 begins to move until it stops after the plug 36 is released, reaching the second position.

[0039] It should be noted that the first position can be one of the locking or unlocking positions between the two components to be operated, and the second position is the other locking or unlocking position, which can be configured according to the specific shape of the two components to be operated. In this application, the locking part in the first position extends out of the tube body to a predetermined position, and in the second position, it retracts into the tube body.

[0040] Compared to existing triggering devices, the improvements are as follows:

[0041] The housing assembly 10 includes a plastic-coated body 14, and the tube body 15 includes a first tube body 12 and a second tube body 13 fixedly connected to each other. At least a portion of the inner walls of the first tube body 12 and the second tube body 13 define a sealed cavity. The first tube body 12 has a higher resistance to deformation than the second tube body 13. The tube body 15 is also provided with an opening 123 for mounting the igniter 20 and / or for allowing high-pressure gas to enter the sealed cavity, and an insertion hole 125 for the limiting device 126 to be inserted and engaged with the locking rod 30. The plastic-coated body 14 fixes the igniter 20 to the tube body 15 and covers the opening 123, the insertion hole 125, and the limiting device 126 in the circumferential direction. Preferably, the opening 123 and the insertion hole 125 are provided on the first tube body 12.

[0042] In practice, the first tube 12 near the locking part 31 has high resistance to deformation, such as having a larger tube wall thickness, a more complex tube structure, or using high-strength tube materials or manufacturing processes. This allows it to withstand greater shear forces, increasing strength and rigidity, preventing tube deformation, and ensuring the sealing of the cavity. The plastic-coated body 14 simplifies the igniter's installation process, making manufacturing simpler, reducing assembly steps, and thus lowering production costs. The limiting device 126 is molded together with the locking rod 30 after being fitted through the insertion hole 125, providing a visible assembly method and improving product stability.

[0043] like Figure 2 and Figure 3As shown, in some embodiments, the first tube 12 includes a guide section 121 with an inner diameter matching the outer diameter of the locking rod 30 and an installation section 122 with an inner diameter spaced apart from the outer diameter of the locking rod 30. One end of the installation section 122 is embedded in the interior of the second tube 13 and fixedly connected by welding. The inner wall of the installation section 122 defines a sealed cavity, and the igniter 20 is fixed on the installation section 122 by a plastic-coated body 14.

[0044] The piston portion 32 is placed in the second tube 13, and the inner wall of the mounting section 122, part of the inner wall of the second tube 13, the end face of the piston portion 32, and the outer wall of the rod portion of the locking rod 30 together define the sealing cavity. Figure 3 When the locking lever 30 is in the first position, the end face of the piston portion 32 abuts against the end of the mounting section 122. Figure 4 When in the second position, the piston portion 32 is away from the mounting section 122.

[0045] Preferably, the first tube body 12 is cast from iron, and the second tube body 13 is a seamless steel pipe. The first tube body 12 has a thicker wall. The two are welded together using an aluminum brazing process. The plastic-coated body 14 is integrally injection molded by placing the tube body in an injection mold. Compared with the traditional one-piece tube body, this solution allows the cast first tube body to be designed with complex structures required for strength, while using a traditional second tube body for parts with lower strength requirements. This balances strength and material cost, ensuring both the sealing of the welded joints and the strength of the connection.

[0046] In some embodiments, the housing assembly 10 further includes a plate-shaped support 11, which includes a connection hole 111, and one end of the guide segment 121 is embedded in the connection hole 111 and fixed by welding.

[0047] The plate-shaped bracket 11 is a metal component and includes a mounting hole 112. The plate-shaped bracket 11 connects the triggering device to the vehicle body component through the mounting hole 112. The plate-shaped bracket 11 has higher resistance to deformation in the plane direction. One end of the guide section 121 is embedded in the connection hole 111 and fixed, which can further improve the deformation resistance of the first tube 12.

[0048] like Figure 3 and Figure 4 As shown, in some embodiments, the wall thickness of the guide section 121 is greater than the wall thickness of the mounting section 122, and the wall thickness of the mounting section 122 is greater than the wall thickness of the second tube body 123. The mounting section 122 is provided with an opening 123 communicating with the sealing cavity, and the plastic coating 14 fixes at least a portion of the igniter 20 in the opening 123.

[0049] During implementation, the guide section 121 corresponds to the area of ​​high-intensity shear force, the installation section 122 corresponds to the impact area of ​​the igniter 20, and the second tube 13 corresponds to the moving area of ​​the piston part 32. The gradual decrease in the wall thickness of the three areas conforms to the required anti-deformation capacity of each area, which can effectively ensure the stability of the device actuation process and prevent unreliable deformation in local areas.

[0050] like Figure 2 As shown, in some embodiments, the first tube 12 has a base 1231 extending away from the sealed cavity around the opening 123. The base has a flat end face 1232. The igniter 20 includes a gas-generating body 21, a flange 22 surrounding the gas-generating body, and a pin 23 electrically connected to the gas-generating body. The flange 22 overlaps the flat end face 1232. The plastic coating 14 covers the outer periphery of the first tube 12 at the axial position of the opening 123 in the circumferential direction and forms a connector 141. One end of the pin 23 extends into the connector 141.

[0051] In this design, circumferential refers to the direction around the outer periphery of the tube body, and axial refers to the extension direction of the tube body. The plastic coating 14 forms a ring-shaped enclosure around the outer periphery of the first tube body 12, preventing the plastic coating from separating radially along the tube body. Simultaneously, the plastic coating base prevents the plastic coating from sliding circumferentially along the tube body. The igniter 20 is an integrated component. The gas-generating body 21 is embedded in the base 1231, and the flange 22 overlaps on the straight end face 1232, achieving pre-fixation between the igniter 20 and the tube body 15, preventing the plastic coating from detaching from its predetermined position during injection molding. This design fixes the igniter in a single injection-molded unit, simplifying the traditional igniter installation process and reducing costs. The connector 141 is used for installing a connector (not shown) that is electrically connected to the igniter, transmitting the ignition signal.

[0052] It should be noted that the plastic coating 14 covers the outer periphery of the tube body 15 in the circumferential direction to form a ring-shaped closed structure and fixes the igniter on the tube body. This is not limited to the embodiment described in this application. Other non-open igniter mounting structures can also be applied to this innovative design to obtain the beneficial effects shown in this application.

[0053] Preferably, a receiving structure is formed within the connector 141 to receive the shorting clip 24 that mates with the pin. It is understood that the "shorting clip 24" is well known to those skilled in the art and will not be described in detail here.

[0054] like Figure 2 and Figure 5As shown, in some embodiments, the outer wall of the first tube 12 is further provided with a plurality of recessed weight-reducing blind holes 124, into which the plastic-coated body 14 is embedded in the weight-reducing blind holes 124 in the circumferential direction. The engagement of the weight-reducing blind holes with the plastic-coated body effectively reduces the weight of the product and further enhances the shear resistance of the plastic-coated body. The weight-reducing blind holes 124 are arranged at intervals along the circumference of the first tube 12 and are located approximately axially with the opening 123, so that the plastic-coated body 14 is subjected to uniform force.

[0055] Preferably, the insertion hole 125 is located in any one of the weight-reducing blind holes 124, which can prevent the limiting device 126 from loosening due to slight vibration of the plastic-coated body 14 during daily use.

[0056] Preferably, the limiting device 126 is a bolt, and the inner wall of the insertion hole 125 is provided with a threaded structure. The limiting device 126 is threadedly engaged with the insertion hole 125, which enhances the stability of the limiting device 126 in the predetermined position and during the cutting process.

[0057] During implementation, such as Figure 6 As shown, the locking lever 30 is in the second position. At this time, the limiting device 126 is cut off, part of which is still in the first housing 13, and the other part moves in the second tube 14 with the locking lever.

[0058] like Figure 2 and Figure 5 As shown, in some embodiments, the locking rod 30 is provided with a circumferential annular groove 33, the limiting device 127 passes through the insertion hole 125 and is embedded in the circumferential annular groove 33, and the plastic body 14 covers the insertion hole 125 and the limiting device 127 in the circumferential direction.

[0059] The circumferential annular groove 33 is a continuous annular structure, allowing the limiting device to be inserted at any position in the circumferential direction. Its axial position on the locking rod 30 is set according to a preset first position. In this embodiment, the first position is where the end face of the piston portion 32 abuts against the end face of the mounting section 122, and the axial position of the circumferential annular groove 33 is located at the axial position of the insertion hole 125 at this time.

[0060] During implementation, before injection molding of the plastic-coated body 14, the limiting device 127 is passed through the insertion hole 125 until it stops at the bottom of the axial annular groove 33. Whether it is properly engaged can be determined by the predetermined distance of insertion and by manually dragging the locking rod 30. If the locking rod 30 does not reach the first position, the limiting device 127 cannot be inserted to the predetermined distance. This solution provides a reliable installation and testing environment. After injection molding of the plastic-coated body 14, the fixing and sealing effect of the limiting device 127 is guaranteed, and the appearance is also improved.

[0061] like Figure 2 and Figure 3As shown, in some embodiments, the plastic-coated body 14, having a circumferentially closed structure, extends axially to a position 128 at the drop between the first tube 12 and the second tube 13. The outer periphery of the first tube 12 is also provided with an annular flange 126, located on the side of the opening 123 away from the second tube 13. The other axial end of the plastic-coated body 14 extends to an end face that fits against the annular flange 126. Alternatively, the other axial end of the plastic-coated body 14 may be disposed across the annular flange.

[0062] During implementation, the placement of the drop position 127 and the annular flange 126 further enhanced the shear resistance of the plastic-coated body 14 and improved its stability.

[0063] It should be noted that the annular flange 126 can be any structure transverse to the extension direction of the tube body 15, and can be continuous or discontinuous. Preferably, the annular flange 126 is a continuous plate-like structure extending radially outward along the tube body.

[0064] like Figure 2-6 As shown, in some embodiments, the housing assembly 10 is further provided with sealing rings. A first sealing ring 34 is provided between the guide section 121 of the first tube 12 and the rod portion of the locking rod 30, and a second sealing ring 35 is provided between the second tube 13 and the piston portion 32 to enhance the sealing performance of the sealing cavity. The end of the second tube 13 is machined with a flared structure 131. After the locking rod 30 and the plug 36 are sequentially inserted into the tube 15, the end of the flared structure 131 is contracted by a riveting process, and the plug 36 is held in the position of the flared structure 131. Preferably, a sealing structure is also provided between the plug 36 and the tube 15 to ensure the sealing effect of the tube.

[0065] Based on the same inventive concept, embodiments of this specification provide an assembly method for a triggering device according to the present invention, comprising the following steps:

[0066] like Figure 7 As shown, the housing assembly 10 includes a plate-shaped support 11, a first tube 12, and a second tube 13 arranged in sequence. The plate-shaped support 11 and the first tube 12 are metal castings, and the second tube 13 is a seamless steel tube.

[0067] like Figure 8 As shown, one end of the first tube 12 is inserted into the connection hole 111 of the plate-shaped bracket 11, and the other end is inserted into the opening of the second tube 13. The tubes are then fixedly connected by welding, preferably by aluminum brazing.

[0068] like Figure 9As shown, the locking rod 30 is inserted from one end of the second tube 13, the locking part 31 extends through the guide section 121, and the piston part 32 abuts against the end of the first tube 12 to reach the first position; the limiting device 127 passes through the insertion hole 125 and is embedded in the circumferential groove 33 of the locking rod 30, and the igniter 20 is embedded in the opening 123 and the base 1231; then the plug 36 is inserted from one end of the second tube 13 and stops after reaching the end of the flared structure 131, and then the end of the second tube 13 is fixed by riveting.

[0069] like Figure 10 As shown, the above-mentioned components are placed in an injection mold and integrally injection molded to form a plastic body 14. The plastic body 14 includes an annular closed profile and a connector 141 extending to one side. One end of the igniter 20 includes a lead pin 23 protruding from the connector 141, thus completing the assembly manufacturing.

[0070] As can be seen, according to the triggering device provided in this application, the igniter 20 is fixed on the tube body 15 by the integrally molded plastic body 14, and a visual operating environment is provided for the installation of the limiting device 127. Under the premise of ensuring increased strength, rigidity and sealing, the assembly process is greatly simplified and the production cost is reduced.

[0071] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the method embodiments described later are relatively simple in description since they correspond to the system, and relevant parts can be referred to the descriptions in the system embodiments.

[0072] The above description is merely a specific embodiment of this application, but the scope of protection of this application 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 application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A triggering device comprising a housing assembly, a locking lever, and an igniter, the housing assembly comprising a hollow tube, the locking lever comprising a piston portion housed within the tube and a locking portion extending outside the tube, an end face of the piston portion forming a sealed cavity between the inner wall of the tube and the lever portion of the locking lever, the igniter being configured to inject high-pressure gas into the sealed cavity to push the piston portion, causing the locking lever to move from a first position to a second position, the locking lever being held in the first position by a limiting device, characterized in that... The tube body is provided with an opening for the installation of the igniter and / or for the high-pressure gas to enter the sealed cavity, and an insertion hole for the limiting device to engage with the locking rod after insertion. The housing assembly also includes a plastic coating body, which is configured to cover the outer periphery of the tube body in the circumferential direction, fix the igniter on the tube body and cover the opening, the insertion hole and the limiting device.

2. The triggering device according to claim 1, characterized in that, The locking rod is provided with a circumferential groove, and the limiting device passes through the insertion hole and is embedded in the circumferential groove.

3. The triggering device according to claim 2, characterized in that, The tube body is also provided with a number of recessed weight-reducing blind holes, and the insertion hole is located in any one of the weight-reducing blind holes. The plastic coating covers the weight-reducing blind holes in the circumferential direction.

4. The triggering device according to claim 3, characterized in that, The limiting device is a bolt, and the inner wall of the insertion hole is provided with a threaded structure.

5. The triggering device according to any one of claims 1-4, characterized in that, The plastic coating body wraps around the outer periphery of the tube at the axial position where the opening is located in the circumferential direction, and forms a connector for mounting a connector device for electrical connection with the igniter.

6. The triggering device according to claim 5, characterized in that, The tube has a base extending away from the sealed cavity around the opening, the base having a flat end face, the igniter including a gas generating body, a flange portion surrounding the gas generating body, and a pin electrically connected to the gas generating body, the flange portion overlapping the flat end face, the plastic coating covering the base, the flange portion and the gas generating body forming a connector, one end of the pin extending into the connector.

7. The triggering device according to claim 6, characterized in that, The outer periphery of the tube is provided with an annular flange, and the plastic coating extends axially to the end face of the annular flange and / or across the annular flange.

8. The triggering device according to claim 6, characterized in that, The connector has a receiving structure for accommodating a shorting clip that mates with the pin.

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