JP2007223485A - Gas generator for vehicular occupant restraint system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas generator for a vehicular occupant restraint system to which a breaking rod of a closing means of a gas emission passage is reliably fixed. <P>SOLUTION: A space between a housing 20 and an ignition means chamber 30 is closed by a first closing means 38; and a space between the housing 20 and a diffuser unit 40 is closed by a second closing means 48. A root 25 of a rod 24 which breaks the second closing means and opens a passage to the diffuser unit 40 is brought into contact with a wall surface in the vicinity of the first closing means 38, and integrated with a retainer 50 with its front end 27 fitted to a position close to the second closing means 48. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas generator used in a vehicle personnel restraint device such as an air bag, an inflatable seat belt, a pedestrian protection device, and the like, and an assembling method thereof.

  In a gas generator that inflates an air bag or the like in a vehicle occupant restraint device or a pedestrian protection device, an air bag (restraint device) is connected to the gas discharge port, so that an ignition lead wire that obstructs the bag connection in the vicinity of the gas discharge port A structure in which there is no igniter or the like to be connected is preferable.

Patent Document 1 discloses an inflator using a pressurized gas, in which an igniter and a gas discharge port are separated. It is a structure that opens the gas discharge path by causing the closing plate that closes the gas discharge port to fly by cleaving the closing plate crushing bullet. In patent document 1, the bullet body for obstruction | occlusion board crushing is hold | maintained by the holding member arrange | positioned inside a gas storage part.

  In the invention of Patent Document 1, an ignition agent and a gas generating agent are used in operation. Moreover, the both ends of the bullet for crushing plate crushing described above have an enlarged diameter, and it is difficult to hold the bullet for crushing plate crush through the holding member. Therefore, the base end portion is simply fitted into the gas ejection portion, and the closing plate crushing bullet is not sufficiently fixed.

Patent No.3562020

  The present invention is a gas generator that is provided at a position where an igniter and a gas discharge port are separated from each other, and has a structure in which a blocking means of a gas discharge path leading to the gas discharge port is broken by a rod, and the rod is securely fixed It is an object of the present invention to provide a gas generator for a human restraint device and an assembly method thereof.

As a means for solving the problems, the present invention
A cylindrical housing having two openings, an ignition means chamber connected to one opening of the cylindrical housing, and a diffuser portion having a gas discharge port connected to the other opening of the cylindrical housing And
Between the cylindrical housing and the ignition means chamber is closed by a first closing means, and between the cylindrical housing and the diffuser part is closed by a second closing means, and a pressurized gas is contained in the cylindrical housing. Is filled,
In the cylindrical housing, a rod for breaking the second closing means and opening the passage to the diffuser part during operation is in contact with the wall near the first closing means, and the tip part is the first part. (2) A gas generator for a person restraining device for a vehicle, which is arranged in an integrated state with a retainer fitted in a position close to a closing means.

  During the operation of the gas generator, the first closing means is broken by the ignition means, the second closing means is broken by the rod, and the gas discharge path leading to the gas discharge port is opened. The personnel restraint device is activated. Such an operation needs to be performed reliably over 10 years, which is the useful life of the vehicle, from the viewpoint of ensuring the safety of passengers. Therefore, the rod may come off or be displaced due to externally applied vibration. Thus, the destruction of the second closing means must not be prevented.

  In the present invention, the rod and the retainer, which are separate members, are combined and integrated, and are arranged inside the cylindrical housing. The term “integrated” means that the rod and the retainer are joined together at least in part to form one part as a whole, and are used as one part when the gas generator is assembled. The integrated state of the rod and the retainer is maintained when the gas generator is assembled and when the gas generator is not in operation, and is canceled when the gas generator is in operation.

  In order to reliably destroy the second closing means, it is preferable that the center of the rod and the center of the second closing means are aligned, but when the rod and the retainer are integrated, It becomes easy to match the above-mentioned centers.

  The retainer preferably has the same cross-sectional shape as the cross-sectional shape in the width direction of the cylindrical housing and can be press-fitted into the cylindrical housing. The cross-sectional shape in the width direction of the cylindrical housing is preferably circular, but may be polygonal or elliptical.

  The rod tip portion means a portion of the rod that directly participates in destroying the second closing means during operation (a portion that contacts the second closing means at the time of destruction) and the vicinity thereof.

  The rod tip is preferably arranged at a distance from the second closing means before operation, but may be brought into contact therewith. By providing an interval between the rod tip and the second closing means, an initial speed is generated when the rod tip contacts the second closing means, so that the second closing means is easily destroyed.

  The rod tip is preferably pointed in the shape of an arrowhead in order to facilitate the destruction of the second closing means, but it may be flat or hemispherical. In the case where the rod tip is pointed like an arrowhead, it is preferable that the angle formed by the arrowhead-shaped portion is in the range of 45 ° to 150 °. If the rod tip has a flat surface, an angle [preferably the flat surface and the flat surface is in contact with the boundary between the shaft and the tip of the rod in order to facilitate the destruction of the second closing means by shearing. It is preferable that the angle formed by the surface (side surface) is 90 ° or an angle having an angle close thereto.

  The rod preferably has a circular cross-sectional area in the width direction, but may have a polygonal shape. In the case of a polygonal shape, the rod diameter is, for example, a diameter in the case of a circle, a diagonal length in the case of a square or a hexagon, and a maximum length in the case of a pentagon.

  The ignition means accommodated in the ignition means chamber, the first closing means, and the second closing means use ignition means including an electric igniter used in a known gas generator, or a rupturable plate made of stainless steel, iron, or the like. be able to.

  In another aspect of the present invention, the retainer has a hole, and the rod tip has a penetrating part penetrating the hole and a non-penetrating part not penetrating the hole, The gas generator for a personnel restraint device for a vehicle according to claim 1, wherein the rod and the retainer are integrated by sandwiching a periphery of the hole between a penetrating portion and the non-penetrating portion. .

  The rod tip has an outer diameter where the penetrating portion is larger than the hole diameter of the retainer, the non-penetrating portion has an outer diameter larger than the hole diameter of the retainer, and a step (step difference) between the non-penetrating portion and the penetrating portion. Surface). Therefore, the rod tip and the retainer are in a state where the stepped surface is in contact with the periphery of the hole of the retainer, the penetrating part is located on one side of the hole, and the non-penetrating part is located on the opposite side of the hole. Yes.

  As a method of sandwiching the periphery of the hole between the penetrating part and the non-penetrating part, after passing the penetrating part having an outer diameter smaller than the hole diameter through the hole of the retainer, the penetrating part is deformed to be crushed ( For example, a method of making the outer diameter of the penetrating portion larger than the hole diameter by caulking and deforming as described above, and a cap-shaped or annular pressing member having an inner diameter that matches the outer diameter of the penetrating portion. A method of fitting or screwing into the penetrating portion can be applied.

  In this way, combining the rod tip and the retainer hole facilitates the integration of the rod and the retainer, and the center of the retainer hole coincides with the center of the rod tip when integrated. By adjusting as described above, it is easy to align the center of the rod tip and the center of the second closing means.

  In another aspect of the present invention, the retainer has a hole, and the rod tip has a penetrating part penetrating the hole and a non-penetrating part not penetrating the hole, The vehicle according to claim 1, wherein an annular groove is formed between a penetrating part and the non-penetrating part, and the rod and the retainer are integrated by fitting the periphery of the hole into the annular groove. A gas generator for a human restraint system is provided.

  Each of the penetrating portion and the non-penetrating portion of the rod tip has an outer diameter larger than the hole diameter of the retainer. The diameter of the annular groove between the penetrating part and the non-penetrating part is less than or equal to the hole diameter of the retainer, and the width of the annular groove is approximately the same as the thickness of the peripheral part of the retainer hole.

  The method of fitting the peripheral part of the retainer hole into the annular groove is to form the retainer or the periphery of the retainer hole with a large elastic member, and push the rod tip while deforming the retainer hole, In addition to being able to apply a method of stopping pushing when reaching the hole position of the retainer, by deforming the penetrating portion so as to crush (for example, deforming as described above by caulking), The thing etc. which became the state where the circumference | surroundings of the hole of the retainer were engage | inserted by the annular groove formed between the non-penetrating parts are also contained.

  By combining the rod tip and retainer hole in this way, the rod and retainer can be easily integrated, and the center of the retainer hole and the center of the rod tip are aligned to match. This facilitates the alignment of the center of the rod tip and the center of the second closing means.

  According to another aspect of the present invention, the retainer is formed of an elastic member, the rod has a root portion that is in contact with a wall surface in the vicinity of the first closing means, and the first deformation is caused by the elastic deformation of the retainer. The gas generator for a person restraining device according to any one of claims 1 to 3, wherein the rod tip portion and the retainer are fixed to each other by being pressed against a wall surface in the vicinity of the closing means, and the rod tip portion and the retainer are pressed against each other. provide.

  The rod tip and the retainer are integrated, for example, in a state where the rod and the retainer are pressed against each other. That is, the retainer is integrated so as to press the rod against the wall surface in the vicinity of the first closing means, and conversely, the rod is integrated so as to press the retainer toward the second closing means. However, the retainer is fixed in the housing so as not to move in response to pressing by the rod.

  Since the rod root portion is pressed and fixed to the wall surface in the vicinity of the first closing means by being fixed in this way, the rod is supported by the tip portion and the root portion, and is dropped or displaced. Can be prevented. In particular, since the rod tip is integrated with the retainer, the rod tip can be fixed in the radial direction and the axial direction by fixing the retainer. Further, since the rod root portion is pressed against the wall surface in the vicinity of the first closing means by the elasticity of the retainer, the fixing of the rod root portion is simplified (it is only necessary to prevent the rod root portion from shifting in the radial direction). .

  The portion where the rod tip and the retainer are integrated can be provided with a fragile portion so as to be reliably destroyed with a smaller force when the gas generator is operated. The fragile part is a part where the thickness is thinner than other parts, a part where a groove is formed or cut, and by applying force, deformation, cleavage, preferentially over other parts, By being broken, etc., the integration of the rod and the retainer is eliminated, and the movement of the rod to the second closing member is allowed. The fragile portion can be formed on the retainer side or the rod side.

  In another aspect of the present invention, the retainer is formed of an annular frame portion, a plurality of rod-like support portions extending from a peripheral edge on one end side of the annular frame portion, and the plurality of rod-like support portions. The gas generator for personnel restraint device according to any one of claims 2 to 4, wherein the central support portion has a hole into which the tip of the rod is inserted. I will provide a.

  Since it has the shape which has the opening part enclosed by the cyclic | annular frame part, the center support part, and the rod-shaped support part, it becomes easy to generate | occur | produce the elastic force by these center support parts, a rod-shaped support part, and an annular frame part. The annular frame portion, the center support portion, and the rod-like support portion may have any shape that can exert the elastic force as described above.

  By using such a retainer, when the rod and the retainer are integrated and inserted into the cylindrical housing or attached by press fitting, at least one of the annular frame portion, the central support portion and the rod-like support portion However, since it bends to the 2nd closure member side and the rod is pressed to the 1st closure means side by the reaction force, fixation of a rod and a retainer becomes easy. Moreover, since the retainer's elastic force is exerted in this way, the rod will not come off or be displaced even when external vibration is applied.

  Further, the weight can be reduced by the opening portion of the retainer, and the opening portion also functions to facilitate the passage of the pressurized gas. For this reason, the total opening area of the opening portion is set to be larger than the maximum sectional area of the gas discharge passage from the retainer to the gas discharge port and the total opening area of the gas discharge port.

  As a means for solving another problem, the present invention provides a method for assembling a gas generator for a person restraining apparatus according to any one of claims 1 to 5, wherein the cylindrical housing is formed after the rod and the retainer are integrated. Provided is a method for assembling a gas generator for a person restraining apparatus including a step of inserting the gas generator into the person.

  Since the rod and the retainer are integrated into a single part and then mounted in the cylindrical housing, it becomes easy to match the center of the rod tip and the center of the second closing means. Also, the assembly of the gas generator is facilitated.

The present invention provides other means for solving other problems,
It is an assembly method of the gas generator for personnel restraint devices according to any one of claims 2 to 5.
As the rod, a rod having a tip portion composed of a non-penetrating portion having an outer diameter larger than the hole diameter of the retainer and a penetrating portion having a small outer diameter is used.
Step of integrating the rod and the retainer so as to sandwich the periphery of the hole between the non-penetrating part and the penetrating part by caulking the penetrating part after inserting the penetrating part into the hole of the retainer ,
A step of processing the penetrating portion into a shape in which the second closing member is easily broken;
Provided is a method for assembling a gas generator for a person restraining device, which includes a step of inserting the integrated rod and the retainer into the cylindrical housing.

  The rod has an outer diameter that is smaller than the hole diameter of the retainer at the penetrating part, and an outer diameter that is larger than the hole diameter of the retainer at the non-penetrating part. Based on this, the one having a step (step surface) between the non-penetrating portion and the penetrating portion is used. Therefore, when the rod tip is inserted into the hole of the retainer, the step surface is brought into contact with the periphery of the hole, the penetrating part is located on one side of the hole, and the non-penetrating part is divided and located on the opposite side of the hole It is in a state.

  The step of integrating the rod and the retainer and the subsequent processing step of the penetrating portion may be a single continuous step. For example, by applying a rolling caulking method, the penetrating portion is deformed so as to be crushed toward the outside in the axial direction and / or the radial direction, thereby sandwiching the periphery of the retainer hole between the penetrating portion and the non-penetrating portion. The tip portion and the retainer are integrated, and the tip portion is deformed into a shape in which the second closing member is easily broken. The rod tip can be in the shape of an arrowhead, a flat surface, a hemisphere, or the like.

  Rolling caulking is a process in which a rotating rod-shaped jig (having a roller at the tip and this roller is rotating) is pressed against the entire circumference of the penetrating part circumferential surface to deform that part. Is the law.

  Since the rod and the retainer are integrated in this manner and then mounted in the cylindrical housing, the center of the rod tip and the center of the second closing means can be easily aligned and the assembly can be facilitated.

  In the gas generator of the present invention, the rod and the retainer can be easily fixed, and the gas generator can be easily assembled. Furthermore, since the position of the rod or the retainer does not shift or fall off due to vibration applied from the outside, the reliability of the product is high.

(1) Gas generator of FIGS. 1 and 2 FIG. 1 (a) is a longitudinal sectional view of a gas generator 10 for an airbag, FIG. 1 (b) is a partially enlarged view of FIG. 1 (a), and FIG. FIG. 3 is a perspective view of the retainer shown in FIG. 1A, and FIG. 3 is a view for explaining a method of integrating the retainer and the rod shown in FIG.

  The cylindrical housing 20 has two openings on both ends, and has an ignition means chamber 30 connected to the opening on one end side, and a diffuser section 40 connected to the opening on the other end side. is doing. These are made of stainless steel or aluminum, and are fixed by welding at the respective joints.

  The interior space 22 of the cylindrical housing 20 is kept airtight and is filled with a simple substance such as argon, helium, nitrogen or a mixed gas thereof (filling pressure is about 35,000 to 70,000 kPa). The pressurized gas preferably has a sound velocity of 400 m / sec or more at 0 ° C. and 1 atm (101.325 kPa). The pressurized gas is filled from the filling hole before being closed by the pin 23 and then sealed by welding the pin 23 and the cylindrical housing 20 together.

  The ignition means chamber 30 has an outer shell formed by an ignition means chamber housing 32. Inside the ignition means chamber housing 32, an electric igniter 36 provided with an igniting agent is accommodated. The igniter 36 is connected to a vehicle power supply circuit via a connector and a lead wire (both not shown). The igniter 36 contains 260 mg of an ignition agent mainly composed of zirconium and potassium perchlorate as an ignition agent.

  The first passage 37 between the cylindrical housing 20 (internal space 22) and the ignition means chamber 30 is closed by a stainless steel first rupturable plate 38, and the inside of the ignition means chamber 30 is at normal pressure. . The peripheral edge of the first rupturable plate 38 is welded and fixed to a first annular stepped surface 33 provided on the inner surface of the ignition means chamber housing 32.

The diffuser section 40 has an outer shell formed by a diffuser housing 42, and the diffuser housing 42 is provided with a plurality of gas discharge ports 46 that discharge pressurized gas to the outside. In this embodiment, 30 gas discharge ports 46 having a diameter of 1.5 mm are formed (total opening area 53 mm ² ).

The second passage 44 between the cylindrical housing 20 (internal space 22) and the diffuser portion 40 is closed with a second rupturable plate 48 made of stainless steel, and the inside of the diffuser portion 40 is at normal pressure. The peripheral edge of the second rupturable plate 48 is fixed to the diffuser housing 42 by welding. Further, in order to cleave the second rupturable plate 48, a rod 24 is disposed in the cylindrical housing 20 (internal space 22). In addition, the cross-sectional diameter (A) of a 2nd channel | path is 8 mm (a cross-sectional area is 50 mm < ² >).

  A retainer 50 is disposed in a portion near the diffuser portion 40 in the cylindrical housing 20.

  The retainer 50 shown in FIG. 2 includes an annular frame portion 51 having a peripheral surface portion 52 and an annular surface portion 53, a plurality of rod-like support portions 54a, 54b, 54c, 54d extending from the annular surface portion 52 to the center, and rod-like support portions. The center support part 55 which has the hole 56 connected with 54a-54d consists of. The retainer 50 is made of a metal such as stainless steel or aluminum, or a synthetic resin, and has elasticity. The center support part 55 becomes a weak part, and is more easily destroyed than other parts.

The retainer 50 has four openings 59 surrounded by an annular frame portion 51 (annular surface portion 53), a central support portion 55, and rod-like support portions 54a, 54b, 54c, and 54d. The total opening area of the four openings 59 is 60 mm ² .

  The rod 24 includes a disk part (root part) 25, a shaft part 26, and a tip part 27. The distal end portion 27 has a non-penetrating portion 27a and an arrowhead-shaped penetrating portion 27b. Each part is integrated and is made of metal such as stainless steel or aluminum.

  The disk portion 25 is in contact with a second annular step surface 34 provided on the inner surface of the ignition means chamber housing 32. In FIG. 1A, the first rupturable plate 38 and the disc portion 25 are separate members, but the disc portion 25 and the first rupturable plate 38 may be formed integrally, and further the disc portion 25 is the first rupturable portion. It may be one that also serves as the plate 38. In order to facilitate the movement of the rod 24 by the operation of the igniter, the outer peripheral surface of the disk portion 25 is set to such an extent that the peripheral wall portion 33a of the housing 32 is prevented from moving in the radial direction.

  In the tip portion 27, the non-penetrating portion 27a and the penetrating portion 27b are respectively located on the opposite side to one side in the axial direction of the hole 56, and the central support portion 55 having the hole 56 is the first portion on the non-penetrating portion 27a side. The first contact surface 28a and the second contact surface 28b on the penetrating portion 27b side are sandwiched from both sides.

  The rod 24 and the retainer 50 are press-fitted into the cylindrical housing 20 in a state where the rod 24 and the retainer 50 are integrated at the distal end portion 27 of the rod 24 and the central support portion 55 of the retainer 50. And the peripheral part 51a of the retainer 50 is contact | abutted to the diffuser housing 42, and the movement to the 2nd rupturable plate 48 direction is blocked | prevented. Since the center of the hole 56 and the center of the second rupturable plate 48 face each other, the center of the distal end portion 27 (the apex of the arrowhead-shaped through portion 27b) and the center of the second rupturable plate 48 also face each other.

  Since the rod 24 and the retainer 50 integrated in this way are press-fitted into the cylindrical housing 20, the central support portion 55 or the annular frame portion 51 such as the rod-like support portion 54 a is bent toward the second rupturable plate 48 side. Deform. Since the retainer 50 itself has elasticity, the rod 24 is pressed toward the first rupturable plate 38 by a restoring force when the central support portion 55 or the annular frame portion 51 such as the rod-like support portion 54a is deformed. Has been. On the other hand, the retainer 50 is pressed toward the second rupturable plate 48 by the rod 24 (since the retainer 50 is in contact with the diffuser 42, the retainer 50 does not move toward the second rupturable plate 48). 50 are fixed in a state where they are pressed against each other.

  Thus, since the rod 24 and the retainer 50 are sandwiched between the ignition means chamber housing 32 and the diffuser housing 42, both the retainer 50 and the rod 24 are fixed at predetermined positions. Further, not only rattling of the rod 24 is prevented by vibrations from the outside, but also rattling and dropping of the retainer 50 itself are prevented.

  Next, the operation when the gas generator 10 shown in FIGS. 1 and 2 is incorporated into an automobile airbag system will be described.

  When the automobile collides and receives an impact, the first rupturable plate 38 is destroyed and the first passage 37 is opened by the shock wave generated by the operation signal from the control unit and the igniter 36 being activated and ignited. . The shock wave that broke the first passage 37 subsequently collides with the rod disk portion 25 and presses the rod 24 toward the diffuser portion 40 side.

  As a result, the rod 24 moves in the axial direction, and in the retainer 50 shown in FIG. 2, the distal end portion 27 inserted in the hole 56 breaks the central support portion 55 and goes straight and collides with the second rupturable plate 48. To do.

The distal end portion 27 (penetrating portion 27b) is sharp, and when the second rupturable plate 48 collides with the central portion of the second rupturable plate 48, the second rupturable plate 48 is cleaved in a petal shape from the central portion. It becomes a united state and no debris is generated.
In the case of FIG. 2, the hole 56 itself is a fragile part. However, a thicker part thinner than the thickness of the retainer 50 (central support part 55) is further formed outside the hole 56, A fragile part can be formed by forming a groove or notch. Further, the non-penetrating portion 27a of the rod tip portion 27 may be a thin-walled fragile portion that is easily broken.

  When the second rupturable plate 48 is thus cleaved from the central portion in a petal shape and the second passage 44 is opened, the pressurized gas is discharged from the gas discharge port 46 and the airbag is inflated. In addition, when the shape of the rod tip portion 27 is other than the arrowhead shape, the fracture state of the second rupturable plate 48 is different.

(2) Method for Assembling Gas Generator in FIGS. 1 and 2 The method for assembling the gas generator in FIGS. 1 and 2 will be described with reference to FIGS. 3A to 3C are partial cross-sectional views for explaining the assembling method.

  The rod 24 and the retainer 50 are press-fitted into the cylindrical housing 20 in an integrated state in advance.

  The rod 24 before being integrated with the retainer 50 has a non-through portion 27 a having an outer diameter larger than the diameter of the hole 56 of the retainer 50 and a through portion 27 b having an outer diameter smaller than the diameter of the hole 56. Use. Between the non-penetrating portion 27a and the penetrating portion 27b, there is a step surface 28a (first contact surface 28a in FIG. 1B) due to a difference in outer diameter.

  As shown in FIG. 3A, the through portion 27 b is inserted into the hole 56. At this time, the stepped surface 28a is in contact with the surface of the central support portion 55 having the hole 56, and the non-penetrating portion 27a is located on the opposite side of the penetrating portion 27b.

  Next, as shown in FIG. 3 (b), the penetration part 27b is deformed so as to be crushed by rolling caulking, and further, as shown in FIG. Processed into a shape. By this processing, the outer diameter of the penetrating portion 27 b becomes larger than the diameter of the hole 56.

  FIG. 3C is a diagram showing the same state as FIG. 1B, in which the central support portion 55 having the hole 56 has a first contact surface 28a on the non-penetrating portion 27a side and a first supporting surface 28a on the penetrating portion 27b side. The rod 24 and the retainer 50 are integrated by being clamped from both sides by the two contact surfaces 28b. Since the center of the hole 56 and the center of the second rupturable plate 48 face each other, the center of the arrowhead-shaped through portion 27b and the center of the second rupturable plate 48 also face each other.

  Next, the integrated rod 24 and the retainer 50 are placed on the diffuser portion 40 side in the cylindrical housing 20 in a state where the ignition means chamber housing 32 having the first rupturable plate 38 attached to the one end side opening is fixed. Press fit from the opening.

  Thereafter, the diffuser housing 42 is fixed to the other end opening of the cylindrical housing 20 by welding. At this time, when the diffuser housing 42 to which the second rupturable plate 48 is attached is attached to the other end opening of the cylindrical housing 20, the center of the arrowhead-shaped through portion 27 b and the center of the second rupturable plate 48 are automatically aligned. Will be.

  The rod tip 27 is integrated with the retainer 50 and is prevented from moving in the axial direction and the radial direction. The rod 26 is pressed toward the first rupturable plate 38 by the elasticity of the retainer 50, and the root portion 25 is fixed so as to be pressed against the ignition means chamber housing 32. Therefore, the disk portion 25 of the rod 24 is lightly fixed by the peripheral wall portion 33a so as not to be displaced in the radial direction, and the displacement in the axial direction is exclusively prevented by the retainer 50.

  Thereafter, an igniter 36 is attached, and gas is filled into the internal space 22 of the cylindrical housing 20 so as to be a predetermined pressure.

  In the cylindrical housing 20 of the gas generator 10, the rod 24 and the retainer 50 that are integrated with each other are pressed against the first rupturable plate 38 by the retainer 50, and the retainer 50 is pushed by the rod 24 to the second rupturable plate. It is fixed by being pressed to the 48 side. For this reason, the position of the rod 24 and the retainer 50 does not shift or fall off. Further, although the rod 24 is arranged in a pressurized space, since the same pressure is applied to any surface of the rod 24, it is difficult to move the rod 24 by the pressurized gas during operation. There is nothing.

(3) Gas Generator in FIGS. 4 and 5 FIG. 4 (a) is a vertical partial sectional view of a gas generator 100 according to another embodiment, and FIG. 4 (b) is a view of the retainer 50A in FIG. 4 (a). FIG. 5 is a perspective view of the retainer shown in FIG. 4 (a). The gas generator 100 of FIG. 4 is the same as the gas generator 10 of FIG. 1 except that the shape of the tip of the rod 124 and the shape of the retainer 50A are different.

  As shown in FIG. 5, the retainer 50 </ b> A is the same as FIG. 2 except that the periphery of the hole 56 is raised and has an inward flange portion (becomes a fragile portion) 58.

  As shown in FIG. 4B, the rod 124 before being integrated with the retainer 50A has a non-penetrating portion 127a, a penetrating portion 127b, and a step surface 128a. The outer diameter of the non-penetrating portion 127 a is larger than the diameter of the hole 56, and the outer diameter of the penetrating portion 127 b is smaller than the diameter of the hole 56. The shaft 126 and the non-penetrating portion 127a have the same outer diameter.

  The retainer 50A and the rod 124 are caulked so that the front end surface 129a of the penetrating portion 127b becomes a flat surface so that the state shown in FIG. ) 128a and the second contact surface 128b are sandwiched from both sides and integrated.

  In FIG. 4, the front end surface 129a of the penetrating portion 127b is a flat surface, and a 90 ° angle (α in the figure) is formed at the boundary with the side surface 129b. The corners can be formed by using a processing method (cutting or the like) other than caulking. The outer diameter of the front end surface 129 a is slightly smaller than the inner diameter of the second passage 44, and the outer diameter of the shaft portion 126 (non-penetrating portion 127 a) is sufficiently smaller than the inner diameter of the second passage 44.

  Thus, since the rod 124 and the retainer 50A are sandwiched between the ignition means chamber housing and the diffuser housing 42, both the retainer 50A and the rod 124 are fixed at predetermined positions. Not only does the rod 124 rattle due to external vibrations, etc., but also the retainer 50A itself can be prevented from rattling or falling off.

  When the gas generator is activated, when the rod 124 moves and destroys the second rupturable plate 48, the rod tip 127 has a flat surface (tip surface) 129a, so the second rupturable plate 48 is sheared. It is destroyed and punched out as a piece having the same size as the tip surface 129a. And since the punched piece is hold | maintained in the state pressed against the bottom face 40a of the diffuser part 40 by the front end surface 129a, discharge | emission of pressurized gas is not inhibited by the said piece.

  When the distal end surface 129a is pressed against the bottom surface 40a, the shaft portion 126 is positioned in the second passage 44. The outer diameter of the shaft portion 126 is sufficiently larger than the inner diameter of the second passage 44. Since it is small, a gas flow path is secured and discharge of pressurized gas is not hindered.

(A) is a longitudinal cross-sectional view of a gas generator, (b) is a partial view of (a). The perspective view of the retainer of FIG. (A)-(c) is a figure which shows the integration method of a retainer and a rod. (A) is a vertical partial cross-sectional view of another form of gas generator, (b) is a partial view of (a). The perspective view of the retainer used for the gas generator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas generator 20 Cylindrical housing 24 Rod 30 Ignition means chamber 32 Ignition means chamber housing 38 1st rupturable plate 40 Diffuser part 42 Diffuser housing 46 Gas discharge port 48 2nd rupturable plate 50 Retainer

Claims (7)

A cylindrical housing having two openings, an ignition means chamber connected to one opening of the cylindrical housing, and a diffuser portion having a gas discharge port connected to the other opening of the cylindrical housing And
Between the cylindrical housing and the ignition means chamber is closed by a first closing means, and between the cylindrical housing and the diffuser part is closed by a second closing means, and a pressurized gas is contained in the cylindrical housing. Is filled,
In the cylindrical housing, a rod for breaking the second closing means and opening the passage to the diffuser part during operation is in contact with the wall near the first closing means, and the tip part is the first part. (2) A gas generator for a vehicle personnel restraint device arranged in an integrated state with a retainer fitted in a position close to the closing means.   The retainer has a hole, and the rod tip has a penetrating part penetrating the hole and a non-penetrating part not penetrating the hole, and between the penetrating part and the non-penetrating part, The gas generator for a personnel restraint device for a vehicle according to claim 1, wherein the rod and the retainer are integrated by sandwiching a periphery of the hole.   The retainer has a hole, the rod tip has a penetrating part that penetrates the hole and a non-penetrating part that does not penetrate the hole, and an annular groove is formed between the penetrating part and the non-penetrating part. The gas generator for a personnel restraint device for a vehicle according to claim 1, wherein the rod and the retainer are integrated by fitting the periphery of the hole into the annular groove.   The retainer is formed of an elastic member, and the rod is fixed in a state where the root portion is in contact with the wall surface near the first closing means and is pressed against the wall surface near the first closing means by the elastic deformation of the retainer. The gas generator for a personnel restraint device according to any one of claims 1 to 3, wherein the rod tip and the retainer are pressed against each other and fixed.   The retainer includes an annular frame portion, a plurality of rod-like support portions extending from the peripheral edge on one end side of the annular frame portion, and a center support portion formed by the plurality of rod-like support portions, The gas generator for personnel restraint device according to any one of claims 2 to 4, wherein the central support portion has a hole into which the rod tip portion is inserted.   6. A method for assembling a gas generator for a personnel restraint device according to any one of claims 1 to 5, comprising the step of inserting the rod and the retainer and then inserting the rod and the retainer into the cylindrical housing. Generator assembly method. It is an assembly method of the gas generator for personnel restraint devices according to any one of claims 2 to 5.
As the rod, a rod having a tip portion composed of a non-penetrating portion having an outer diameter larger than the hole diameter of the retainer and a penetrating portion having a small outer diameter is used.
Step of integrating the rod and the retainer so as to sandwich the periphery of the hole between the non-penetrating part and the penetrating part by caulking the penetrating part after inserting the penetrating part into the hole of the retainer ,
A step of processing the penetrating portion into a shape in which the second closing member is easily broken;
A method for assembling a gas generator for a person restraining apparatus, comprising the step of inserting the integrated rod and the retainer into the cylindrical housing.

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