JP2020044891A - Mounting structure of gas generator - Google Patents

Abstract

To provide a mounting structure of a gas generator which can facilitate assembly of the gas generator and can reduce processing cost while ensuring quality.SOLUTION: A mounting structure 100 of a gas generator includes the gas generator 10, a module pipe 30, and engagement members 21, 22 which assemble the gas generator 10 on the module pipe 30. The engagement member 21 has a bow-shaped part 21a which warps in an approximately vertical direction with respect to an extension direction of the engagement member 21, and is formed in a wave-like shape as a whole. The bow-shaped part 21a of the engagement member 21 is supported at three point positions A, B, C of hole parts 13, 31, 36, and receives constraint force, and repulsive force accompanying the constraint force (elastic force of the bow-shaped part 21a of the engagement member 21) can strengthen engagement of the gas generator 10 with the module pipe 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gas generator mounting structure used for a safety device such as an automobile.

  2. Description of the Related Art Conventionally, from the viewpoint of protection of occupants of automobiles and the like, seat belt devices and airbag devices have become widespread. Among them, the seat belt device is provided for the purpose of preventing the occupant from being thrown out of the vehicle or outside due to an impact generated at the time of a collision of a vehicle or the like, and the occupant is seated by winding the belt around the occupant's body. To be fixed.

  In recent years, a seatbelt device having a pretensioner function has been widely used for improving an occupant protection function. The pretensioner function instantly winds up the slack of the seatbelt caused by the thickness of the clothes at the time of collision or immediately before the collision, and enhances the restraining effect of the occupant. This pretensioner function is realized by the seat belt being strongly pulled in by the pressure of gas output from a gas generator called a micro gas generator (MGG).

  Such a gas generator has, for example, a metal housing, and may be fixed by welding the housing to a module pipe (for example, see Patent Literature 1). In addition to the welding as described above, a method of caulking and fixing the gas generator to the module pipe, or a method of screwing and fixing the module pipe holding the gas generator using a module cap, and the like. is there.

JP 2006-504230 A

  However, in the conventional method of fixing the gas generator, for example, in the case of welding and fixing, it is necessary to increase the flatness of the opening end face of the module pipe or the flange portion of the gas generator, and accordingly, processing of each part. Costs are required. In addition, since heat is applied to the module pipe or the gas generator during welding, it is necessary to consider the deterioration and ignition of the gas generating agent contained in the gas generator. In the case of caulking and fixing, it is necessary to mold the open end face of the module pipe into a stepped shape for caulking, and when caulking is performed, caulking may occur, so the worst case In such a case, there is a possibility that the electrode pins may be short-circuited. Furthermore, in the case of screw fixing, the gas generator that has come into contact with the module cap rotates together with the module cap, and there is a possibility that the connector cannot be inserted because the pin deviates from a predetermined angle. However, in any of the fixing methods, the backlash in the axial direction of the gas generator can be suppressed.

  Therefore, the present invention provides a gas generator mounting structure that not only suppresses the axial play of the gas generator as in the conventional case, but also facilitates the assembly of the gas generator. The purpose is to provide.

(1) A mounting structure of a gas generator according to the present invention is a mounting structure of a gas generator for generating gas by burning an igniter by ignition by an igniter, and holding the igniter and forming a flange-shaped portion. The gas generator having a holder having at least one hole-shaped gas generator engaged portion penetrated along the thickness direction of the holder, provided on one end side in the axial direction, A module pipe having an opening into which a gas generator is inserted, and a peripheral wall portion in which a hole-shaped pipe engaged portion is formed at a position corresponding to the gas generator engaged portion, An engagement member capable of simultaneously engaging the engaged portion for the gas generator and the engaged portion for the pipe in a state where the gas generator is inserted into the module pipe; At least a part of the module It characterized in that in contact with the opening of the pipe.

  According to the above configuration (1), it is possible not only to suppress the backlash in the axial direction of the gas generator as in the conventional case, but also to use the engaging member for the gas generator engaged portion and the pipe engaged portion. , The gas generator can be easily assembled to the module pipe than before. Further, by having the flange portion, at least a part of the flange portion is brought into contact with and fixed to the opening of the pipe, so that the hole of the engaged portion for the gas generator and the hole of the engaged portion for the pipe are provided. Are aligned with respect to the pipe axis direction. By doing so, a hole communicating in the diametric direction of the pipe is formed, so that the engagement member can be more easily inserted.

(2) In the gas generator mounting structure according to the above (1), the engaging member is provided on the side of the opening of the module pipe opposite to the side of the opening of the module pipe in the engaged portion for the pipe. A first portion that contacts at least a portion thereof, and a second portion that contacts at least a portion of the module generator engaged portion that is closer to the opening side of the module pipe on the side opposite to the opening side of the module pipe. A pressure generated when the first portion contacts the engaged portion for pipe, and a pressure generated when the second portion contacts the engaged portion for gas generator. Preferably, at least a part of the flange portion of the gas generator is pressed against an opening of the module pipe.

  According to the above configuration (2), it is possible to suppress rattling in the radial direction of the gas generator after the engagement member is inserted.

(3) In the gas generator mounting structure according to (1) or (2), at least a part of the flange portion is provided with a convex portion or a concave portion along an outer wall of the module pipe. At the end of the opening of the module pipe, a concave portion or a convex portion is provided at a position corresponding to the convex portion or the concave portion of the flange portion, and the convex portion of the flange portion and the opening portion are provided. And the concave portion of the end portion, or, the concave portion of the flange-shaped portion and the convex portion of the end of the opening are fitted to each other, and positioning of the gas generator with respect to the module pipe, Is also good.

  According to the above configuration (3), it is easy to adjust the phase of the gas generator (the circumferential position of the gas generator with respect to the module pipe). Thereby, when inserting a connector for supplying electricity to the gas generator, the connector can always be inserted from a fixed direction, and it becomes easier to insert. Further, at a position where the convex portion provided on the flange portion and the concave portion provided at the end of the opening of the module pipe are fitted, the engaged portion for pipe of the module pipe and the gas of the holder of the gas generator are provided. If it is designed in advance so that the positions of the engaged portions of the generator correspond to each other, the engaged portions of the module and the pipe are simultaneously engaged with the engaged portions of the module pipe and the holder of the gas generator. Can be made to correspond to the position of the gas generator engaged portion.

(4) In the gas generator mounting structure according to any one of (1) to (3), the engagement member has an arcuate portion warped in a direction substantially perpendicular to an extending direction of the engagement member. Is preferred.

  According to the above configuration (4), when the engaging member having the bow portion is engaged, the bow portion receives the binding force from the engaged portion for the gas generator and the engaged portion for the pipe. Due to the repulsive force (elastic force) associated with the restraining force, a force is generated that presses at least a part of the flange of the gas generator against the opening of the module pipe, and the gas generator is firmly fixed to the module pipe. Become.

(5) In the gas generator mounting structure according to any one of (1) to (3), the engagement member may have a thickness that is continuously reduced along the extending direction of the engagement member. It is preferable to have a tapered portion.

  According to the above configuration (5), when the engagement member having the tapered portion is engaged, as the tapered portion is inserted, the engaged portion of the gas generator is moved relative to the engaged portion of the pipe. By moving the gas generator in the downward direction, a force is generated that presses the flange portion of the gas generator against the opening of the module pipe, and the gas generator is firmly fixed to the module pipe.

(6) In the gas generator mounting structure according to any one of (1) to (3), the engaging member is at least partially opposed to the opening side of the module pipe in the engaged portion for the gas generator. It is preferable to have an elastic member that can contact at least a part of the side.

  According to the above configuration (6), when the engaging member having the elastic member is engaged, the elastic member pushes down, for example, the gas generator engaged portion with respect to the pipe engaged portion. By applying a pressure to move the gas generator in the direction (by the restoring force of the deformed elastic member), a force is generated that presses the flange of the gas generator against the opening of the module pipe, and the gas generator is fixed to the module pipe. Will be strong.

It is an appearance front view of the mounting structure of the gas generator concerning an embodiment of the present invention. It is II sectional drawing of the attachment structure of the gas generator of FIG. It is sectional drawing of the mounting structure of the gas generator of FIG. It is sectional drawing of the mounting structure of the gas generator which concerns on the modification of embodiment of FIG. It is sectional drawing of the mounting structure of the gas generator which concerns on another modification of embodiment of FIG.

  Hereinafter, a gas generator mounting structure according to an embodiment of the present invention will be described with reference to the drawings. This mounting structure is a mounting structure of a gas generator that generates gas by burning an ignition charge by ignition by an igniter.

  As shown in FIG. 1, the gas generator mounting structure 100 of the present embodiment includes a gas generator 10, a module pipe 30, and an engaging member 21 for assembling (fixing) the gas generator 10 to the module pipe 30. , 22. In addition, the engaging members 21 and 22 are also called clips, and 21 and 22 may be connected.

  The gas generator 10 includes an igniter 50, a holder 11 that holds the igniter 50, a bottomed cylindrical cup-shaped member 40 provided on the igniter 50 side of the holder 11, and a cup-shaped member 40. And a filled gas generating agent 60.

  The igniter 50 is provided with electrode pins 51 and 52. When electricity is supplied between the electrode pins 51 and 52, the igniter 50 generates a flame and ignites the gas generating agent 60 in the cup-shaped member 40.

  As shown in FIGS. 1 to 3, the holder 11 includes a flange portion 12, holes 13 and 14 (engaged portions for a gas generator), a fitting portion 15, grooves 16 and 17, and a protrusion. A part 18.

  The flange 12 abuts on the end 35 of the module pipe 30 to position the holder 11 relative to the module pipe 30 in the axial direction.

  As shown in FIG. 3, the holes 13 and 14 are penetrated so as to face symmetrical positions with respect to the electrode pin 51 (52). In addition, the holes 13 and 14 are formed to have a size into which the respective engaging members 21 and 22 are inserted.

  The fitting portion 15 is provided as a portion to be a female connector on the outside of the holder 11. At the bottom of the fitting portion 15, the electrode pins 51 and 52 are partially exposed.

  The grooves 16 and 17 are each formed in a ring shape around the outer wall of the holder 11. An O-ring 41 is fitted in the groove 16 to close a gap between the outer wall of the holder 11 and the inner wall of the cup-shaped member 40 so that the gas generating agent 60 in the cup-shaped member 40 does not take on moisture. It has become. The end of the cup-shaped member 40 is fixed to the groove 17 by caulking.

  As shown in FIG. 1, the protruding portion 18 is a protruding portion that protrudes in the axial direction in a part of the flange portion 12. Further, the convex portion 18 is fitted into a concave portion 34 of the module pipe 30 described later, so that the holder 11 can be positioned.

  The cup-shaped member 40 covers a part of the outer wall of the holder 11 on the igniter 50 side and holds the gas generating agent 60. An O-ring 42 is fitted to the outer wall of the end of the cup-shaped member 40, and closes a gap between the inner wall of the module pipe 30 and the outer wall of the cup-shaped member 40.

  In the gas generator 10 having the above-described configuration, when a vehicle collides, the collision is detected by collision detection means (not shown) provided in the vehicle, and based on the detected collision, a control unit provided in the vehicle outputs an electrode pin 51. , 52, the igniter 50 provided in the gas generator 10 is activated. The gas generating agent 60 is ignited and burned by the flame generated by the operation of the igniter 50, and generates a large amount of gas. This gas serves as a driving force for a seat belt pretensioner or the like provided adjacent to the gas generator 10. Here, as a modified example, by introducing the gas into an airbag (not shown) provided adjacent to the gas generator 10, it is possible to inflate and deploy the airbag. .

  As shown in FIGS. 1 to 3, the module pipe 30 has holes 31, 32, 36 (engaged portions for pipes), an opening 33, a recess 34, and an end 35. ing.

  As shown in FIGS. 1 and 2, the holes 31 and 32 penetrate along the thickness direction of the holder 11 at positions corresponding to the holes 13 and 14. Each is formed in a size to be inserted.

  The opening 33 has a diameter large enough to fit the gas generator 10. As described above, the concave portion 34 is formed in a size to which the convex portion 18 of the holder 11 fits. The end 35 locks the flange 12 of the holder 11.

  The hole 36 is provided in the peripheral wall (cylindrical portion) of the module pipe 30 so as to face the hole 31. The hole 36 is provided at a position corresponding to the hole 13, similarly to the hole 31. Although not shown, in the peripheral wall portion (cylindrical portion) of the module pipe 30, a hole (a pipe engaged portion) similar to the hole 36 is also formed at a position facing the hole 32. It is formed so as to correspond to the position.

  The engaging member 21 has an arcuate portion 21a that is warped in a direction substantially perpendicular to the direction in which the engaging member 21 extends, and is formed in a wavy shape as a whole. Further, the arcuate portion 21a has flexibility, and when the force is applied, it rebounds and is restored to its original shape. Here, FIG. 2 shows the engaging member 21 deformed into a shape in which a force is applied to the arcuate portion 21a to press the point A (second portion). Therefore, the shape of the arcuate portion 21a to which no force is applied before attaching the engagement member 21 to the gas generator attachment structure 100 is not shown, but is more curved and warped than the state of FIG. The engaging member 22 is the same as the engaging member 21.

  Here, when the engagement member 21 is inserted so as to penetrate the hole 31 from the hole 36 via the hole 13, for example, the engagement state shown in FIG. 2 can be obtained. In the engagement state shown in FIG. 2, the arcuate portion 21 a receives a restraining force from the inner wall surfaces of the holes 13, 31, and 36, and receives a repulsive force (elastic force of the engaging member 21) due to the restraining force. The engagement of the gas generator with the pipe can be made strong.

  Specifically, as shown in FIG. 2, the arcuate portion 21a of the engagement member 21 has three points A (second portion), B (first portion), and C (first portion) of the holes 13, 31, and 36. 1) and receives a restraining force, and the repulsive force (elastic force of the arcuate portion 21a of the engaging member 21) accompanying the restraining force firmly engages the gas generator 10 with the module pipe 30. It can be something. In particular, by inserting the engaging member 21 into the hole 13 such that the arcuate portion 21 a of the engaging member 21 presses the point A, the flange 12 of the holder 11 is pressed against the end 35 of the module pipe 30. be able to. In addition, the same effects as those of the engaging member 21 can be achieved with the engaging member 22.

  As described above, according to the present embodiment, the arcuate portion 21 a of the engaging member 21 contacts the inner wall of the hole 13 of the gas generator 10 and the holes 31 and 36 of the module pipe 30. Since the engagement member 21 is configured to engage with the gas generator 10 and the module pipe 30, the gas generator 10 can be easily assembled to the module pipe 30. Further, in the conventional caulking and fixing, it is necessary to mold the opening end face of the module pipe into a stepped shape for caulking and fixing, but in the present invention, since the molding is unnecessary, the processing of the module pipe 30 is performed. There is a cost merit due to the simplification of the process and the shortening of the processing time, and the reduction in the strength of the module pipe 30 can be suppressed. Further, since there is no occurrence of caulking at the time of caulking and fixing, quality can be secured. Furthermore, since there is no concern that the gas generator rotates together with the module cap at the time of the above-mentioned conventional screw fastening and the connector cannot be inserted, there is a cost merit while maintaining the quality.

  Further, according to the present embodiment, since the flange portion 12 is provided on the gas generator 10, positioning of the gas generator 10 in the axial direction of the module pipe 30 can be facilitated.

  Further, since the convex portion 18 is provided on the flange portion 12 of the holder 11 so as to be fitted into the concave portion 34 provided on the module pipe 30, the positioning of the gas generator 10 with respect to the module pipe 30 can be easily performed. Can be. Thus, for example, it is possible to design in advance so that the positions of the holes 31 and 36 of the module pipe 30 and the holes 13 of the holder 11 correspond to the positions where the protrusions 18 and the recesses 34 fit. The positions of the holes 31 and 36 of the module pipe 30 and the holes 13 of the holder 11 can be made to correspond at the same time when the protrusions 18 and the recesses 34 are fitted.

  Further, according to the present embodiment, by inserting the engaging member 21 into the hole 13 so that the arcuate portion 21a of the engaging member 21 presses the point A, the flange portion 12 of the holder 11 is connected to the module pipe. 30 can be pressed against the end 35. Thereby, the degree of close contact between the flange 12 of the holder 11 and the end 35 of the module pipe 30 is improved.

  As described above, the embodiments of the present invention have been described with reference to the drawings. However, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present invention is defined by the terms of the claims, rather than the description of the embodiments, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

  For example, after using the engaging members 21 and 22 for engaging the module pipe 30 and the gas generator 10, the protruding portion is cut, and the protruding portion is bent in the axial direction or the circumferential direction of the module pipe 30. Making the tip of the protruding portion hook-shaped to engage with the engaged portion of the module pipe 30; or bonding the engaging members 21 and 22 to the hole of the module pipe 30 by welding or an adhesive. May be.

  Further, in the above-described embodiment, the projection 18 and the recess 34 are configured to be fitted. However, on the contrary, the projection 18 may be configured to be fitted as a recess and the recess 34 as a projection. .

  In the above embodiment, the engagement members 21 and 22 are longer than the length between the holes 31 and 36 of the module pipe 30, but the engagement members 21 and 22 are equivalent to the length between the holes 31 and 36. You may.

  Further, in the above embodiment, the flange portion 12 of the holder 11 is pressed against the end portion 35 of the module pipe 30 by using the arcuate portions of the engagement members 21 and 22. However, the present invention is not limited thereto. The joining members 21 and 22 may be simply rod-shaped members, and the holder 11 may simply be locked or fixed to the module pipe 30.

  Further, instead of the engaging members 21 and 22 of the above embodiment, the engaging member 121 shown in FIG. 4 or the engaging member 221 shown in FIG. 5 may be used. The details will be described below. In FIGS. 4 and 5, unless otherwise specified, the same parts as those in the above embodiment are denoted by the same reference numerals in the lower two digits, and the description of the same parts as in the above embodiment may be omitted. is there.

  The engaging member 121 in the mounting structure 200 shown in FIG. 4 is a rod-shaped member having a diameter smaller than the diameter of the holes 131 and 136 of the module pipe 130 and the hole 113 of the holder 111, and has a thickness (up and down in FIG. (Width in the direction) from the one end to the other end. Further, as shown in FIG. 4, the engaging member 121 is inserted (press-fitted) so as to engage with the hole 136 of the module pipe 130 and the hole 113 of the holder 111, so that a point D of the hole 136 is obtained. It is supported at the position of (the first portion) and the position of the point E (the second portion) of the hole 113. In other words, the engagement of the gas generator 110 with the module pipe 130 can be strengthened by the restraining force (pressure) generated by the support, and the flange 112 of the holder 111 is connected to the end 135 of the module pipe 130. Can be pressed. Thereby, the degree of adhesion between the flange 112 of the holder 111 and the end 135 of the module pipe 130 is improved. Therefore, the same effect as the above embodiment can be obtained.

  The engaging member 221 in the mounting structure 300 shown in FIG. 5 includes a rod-shaped member 221a having a diameter smaller than the diameter of the holes 231 and 236 of the module pipe 230 and the hole 213 of the holder 211, and a lower part of the middle of the rod-shaped member 221a. And an elastic member 221b (e.g., made of rubber, elastic resin, or the like) fixed to the base member. The elastic member 221b is deformable enough to pass through the hole 213 or the hole 236. Further, as shown in FIG. 5, the engaging member 221 is inserted so as to engage with the holes 231 and 236 of the module pipe 230 and the hole 213 of the holder 211, so that the surface F of the hole 231 ( It is supported at the position of the first portion, the position of the surface G (first portion) of the hole 236, and the position of the surface H (second portion) of the hole 213. That is, the engagement of the gas generator 210 with the module pipe 230 can be strengthened by the restraining force (pressure) generated by the support, and the flange 212 of the holder 211 is connected to the end 235 of the module pipe 230. Can be pressed. Thereby, the degree of adhesion between the flange 212 of the holder 211 and the end 235 of the module pipe 230 is improved. Therefore, the same effect as the above embodiment can be obtained.

10, 110, 210 Gas generators 11, 111, 211 Holders 12, 112, 212 Flanges 13, 14, 31, 32, 36, 131, 136, 231, 236 Holes 15, 115, 215 Fitting part 16 , 17, 116, 117, 216, 217 Groove 18 Convex 21, 22, 121, 221 Engaging member 21a Arcuate portion 30, 130, 230 Module pipe 33, 133, 233 Opening 34 Recess 35, 135, 235 End Parts 40, 140, 240 Cup-shaped members 41, 42, 141, 142, 241, 242 O-rings 50, 150, 250 Igniters 51, 52, 151, 152, 251, 252 Electrode pins 60, 160, 260 Gas generation Agent 221a Bar-shaped member 221b Elastic members 100, 200, 300 Mounting structure

Claims (6)

An attachment structure of a gas generator that generates gas by burning an igniter by ignition by an igniter,
The gas generator that holds the igniter, has a holder having a flange portion, and has at least one hole-shaped gas generator engaged portion penetrated along the thickness direction of the holder,
A peripheral wall provided on one end side in the axial direction and having an opening into which the gas generator is inserted, and a hole-shaped pipe engaged portion formed at a position corresponding to the gas generator engaged portion. A module pipe having:
In a state where the gas generator is inserted into the module pipe, an engaging member capable of simultaneously engaging both the gas generator engaged portion and the pipe engaged portion,
With
At least a part of the flange portion is in contact with an opening of the module pipe. The engagement member,
A first portion that contacts at least a part of the engagement portion for the pipe on the opening side of the module pipe on the opening side of the module pipe of the engagement member;
A second portion that is in contact with at least a part of the engaged portion for the gas generator opposite to the opening side of the module pipe on a side of the engagement member opposite to the side of the opening of the module pipe. And
The pressure generated by the first portion coming into contact with the engaged portion for pipe, and the pressure generated by the second portion coming into contact with the engaged portion for gas generator, the gas generator of the gas generator The mounting structure for a gas generator according to claim 1, wherein at least a part of the flange is pressed against an opening of the module pipe. At least a part of the flange portion is provided with a convex portion or a concave portion along an outer wall of the module pipe,
At the end of the opening of the module pipe, a concave portion or a convex portion is provided at a position corresponding to the convex portion or the concave portion of the flange portion,
The convex portion of the flange portion and the concave portion at the end of the opening, or the concave portion of the flange portion and the convex portion at the end of the opening are fitted, and the gas generator The gas generator mounting structure according to claim 1, wherein positioning of the gas generator is performed with respect to the module pipe.   The gas according to any one of claims 1 to 3, wherein the engagement member has an arcuate portion warped in a direction substantially perpendicular to a direction in which the engagement member extends. Generator mounting structure.   The said engaging member has the taper-shaped part which thickness becomes small continuously along the extension direction of the said engaging member, The Claims any one of Claim 1 thru | or 3 characterized by the above-mentioned. Gas generator mounting structure. The engaging member has, at least in part, an elastic member capable of contacting at least a part of the engaged portion for the gas generator on a side opposite to an opening side of the module pipe. A mounting structure for the gas generator according to any one of claims 1 to 3.

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