JP5179156B2 - Gas generator for vehicle restraint system - Google Patents

Description

  The present invention relates to a gas generator for a person restraining device for a vehicle such as an air bag device.

  A gas generator is used when operating an automobile personnel restraint system. There is a strong demand for gas generators that are smaller and lighter in order to reduce the weight of the entire vehicle. In view of the complexity of assembling and cost, it is preferable that the internal structure of the gas generator is simple and the number of parts is small.

  A gas generator in which two combustion chambers are formed in a housing is known in which one combustion chamber is formed by a cup member (Patent Document 1). For example, in the gas generator shown in FIG. 32, a through hole formed in the peripheral wall portion of the cup member serves as a gas outlet, and the through hole is closed with a seal tape.

FIG. 3 of Patent Document 2 shows a gas generator in which a first chamber 111 includes a second chamber 112. Before the operation of the gas generator, the cup 110 and the cap 120 that form the second chamber 112 are combined, and the opening 124 formed in the cap 120 is closed by the cup 110. The cap 120 slides upward by the pressure when the gas generating agent 60 in the second chamber 112 burns, and the opening 124 is opened. In the present invention, a sealing tape for closing the opening 124 is not necessary.
JP 2001-225711 A US 2007/0120349 A1

In the gas generator of patent document 1, the process of forming a through-hole in a cup member and the process of obstruct | occluding the said through-hole with a sealing tape are needed, and a number of parts and a man-hour increase.
In the gas generator of Patent Document 2, since it is necessary to form two parts of the cup 110 and the cap 120 in order to form the second chamber 112, the structure becomes complicated and it is difficult to meet the demand for weight reduction. In addition, since the opening 124 is formed in the peripheral wall portion of the cap 120 forming the second chamber 112, the high-temperature combustion gas discharged from the opening 124 is close to the filter located on the outer side of the filter. It is easy to concentrate on and partly affected by heat.

  An object of the present invention is to provide a gas generator for a vehicle personnel restraint device that can be reduced in weight by simplifying the structure and that can simplify the manufacturing process.

The invention of claim 1
A first combustion chamber having a first gas generating agent and first ignition means, a second gas generating agent and second ignition means are provided in a housing having a top plate, a bottom plate and a peripheral wall portion and having a gas discharge port. A second combustion chamber is disposed, and a coolant filter for filtering and cooling the combustion gas is disposed;
The second combustion chamber is separated from the first combustion chamber by a combustion chamber cup member;
The combustion chamber cup member is fitted into the second ignition means, receives a pressure when the second ignition means is actuated, slides in the axial direction, and combustion gas between the second ignition means and the second ignition means The present invention provides a gas generator for a vehicle personnel restraint device that forms a gap for releasing the gas.

  The gas generator of the present invention has a structure in which a first combustion chamber surrounds the second combustion chamber and a coolant / filter surrounds the first combustion chamber in the housing, and the second combustion chamber is combusted. It is formed of a chamber cup member. In addition, when the gas generator of the present invention (using only the combustion gas of the gas generating agent as the gas source) is operated, the housing top plate and the bottom plate are always deformed so as to swell outward due to an increase in internal pressure.

In the present invention, the combustion chamber cup member is not fixed by fixing means such as welding or screws, but is merely fitted into the second ignition means. Therefore, the combustion chamber cup member can be slid in the axial direction so as to be detached from the second ignition means under the pressure when the second ignition means is operated. And by the said sliding, the clearance gap which discharge | releases combustion gas is formed between a combustion chamber cup member and the 2nd ignition means, and the said clearance gap becomes the exit of the combustion gas which generate | occur | produced in the 2nd combustion chamber. The opening of the combustion chamber cup member may be in contact with the housing bottom plate or may not be in contact with the housing bottom plate.
Moreover, the combustion chamber cup member after the operation may or may not come off from the second ignition means. The combustion chamber cup member is preferably fitted directly into the second ignition means, but another member may be interposed between the combustion chamber cup member and the second ignition means.

  Since the gap (gas outlet) formed in this way opens toward the bottom plate of the housing, the combustion gas once collides with the bottom plate of the housing and then changes its direction and flows into the first combustion chamber. The gas is discharged from the gas outlet. For this reason, the combustion gas flowing out from the second combustion chamber is prevented from concentrating directly on a part of the coolant / filter.

  Further, when the first gas generating agent in the first combustion chamber burns first and the second gas generating agent in the second combustion chamber burns with a delay, the pressure in the first combustion chamber is increased and combustion occurs. The chamber cup member receives pressure from the outside. For this reason, since the combustion chamber cup member fitted in the second ignition means pushes the second ignition means from the outside, the airtightness in the second combustion chamber is maintained, and the combustion gas in the first combustion chamber is the first. 2 A malfunction that flows into the combustion chamber and ignites the second gas generating agent is prevented.

  In addition, a gap may be formed between the bottom of the combustion chamber cup member (at a position close to the housing top plate from the installed state) and the housing top plate, and the bottom portion may be formed on the housing top plate. You may contact | abut. As described above, when the gas generator is operated, the housing top plate is deformed so as to swell outward due to an increase in internal pressure. Therefore, even when the bottom portion is in contact with the housing top plate, the combustion chamber cup member is Sliding in the axial direction is not hindered.

  According to a second aspect of the present invention, there is provided the gas generator for a vehicle personnel restraint apparatus according to the first aspect, wherein the combustion chamber cup member has a minimum opening diameter.

  Thus, the volume of the second combustion chamber can be increased to a desired range by minimizing the diameter of the opening and increasing the diameter of the other part.

The invention of claim 3
The said 2nd igniter collar has a groove | channel in an axial direction, and when the said combustion chamber cup member slides in an axial direction, the said groove | channel becomes a clearance gap which discharge | releases combustion gas. A gas generator for a vehicle restraint device is provided.

  When such a groove is present, a gap serving as a gas outlet of the second combustion chamber is easily formed. There may be one groove or a plurality of grooves. When there are a plurality of grooves, they may be formed at equal intervals or may be formed in a biased manner.

The groove of the second igniter collar is
(I) When formed from a position corresponding to the same plane as the housing bottom plate to a desired upper position (that is, the lower end of the groove is in contact with the housing bottom plate),
(II) Any of the case where the groove is formed from a position corresponding to a position slightly above the same plane as the housing bottom plate to a desired position above (that is, the lower end of the groove is not in contact with the housing bottom plate). .

  In the case of (I), the opening of the combustion chamber cup member prevents a malfunction in which the combustion gas in the first combustion chamber flows into the second combustion chamber and the second gas generating agent is ignited. From the viewpoint, it is in contact with the housing bottom plate. In the case of (II), the opening of the combustion chamber cup member may or may not be in contact with the housing bottom plate. In the case of (II), even when the opening of the combustion chamber cup member is not in contact with the housing bottom plate, the inner peripheral surface of the combustion cup member is in contact with the outer peripheral surface without the groove of the second igniter collar. .

The invention of claim 4
The combustion chamber cup member has an opening abutted against the housing bottom plate and has a groove reaching the opening on the inner peripheral surface thereof, and the combustion chamber cup member slid in the axial direction. The gas generator for a personnel restraint device for a vehicle according to claim 1 or 2, wherein the groove becomes a gap for releasing combustion gas.

  When such a groove is present, a gap serving as a gas outlet of the second combustion chamber is easily formed. There may be one groove or a plurality of grooves. When there are a plurality of grooves, they may be formed at equal intervals or may be formed in a biased manner.

The invention of claim 5
The combustion chamber cup member has a hole in the inner peripheral surface near its opening end, and when the combustion chamber cup member slides in the axial direction, the hole becomes a gap for releasing combustion gas. A gas generator for a vehicle personnel restraint device according to claim 1 or 2 is provided.

  If there is such a hole, a gap serving as a gas outlet of the second combustion chamber is easily formed. There may be one hole or a plurality of holes. When there are a plurality of holes, they may be formed at equal intervals or may be formed in a biased manner.

  Prior to operation, the opening end of the combustion chamber cup member is fitted into the second ignition means, so that the hole is closed by the second ignition means. When the combustion chamber cup member slides, the hole is opened and the outside of the second combustion chamber is circulated.

The invention of claim 6
The combustion chamber cup member has a cutout portion in which an inner peripheral surface in contact with the opening end portion is cut out in the axial direction, and when the combustion chamber cup member slides in the axial direction, the cutout portion is formed. The gas generator for a personnel restraint device for a vehicle according to claim 1 or 2, wherein the notch becomes a gap for releasing combustion gas.

  The notch is formed, for example, by cutting the inner peripheral surface in contact with the open end of the combustion chamber cup member into a quadrangle, a triangle, a semicircle, or the like. When such a notch is present, a gap serving as a gas outlet of the second combustion chamber is easily formed. There may be one notch or a plurality of notches. When there are a plurality of cutout portions, they may be formed at equal intervals or may be formed unevenly.

  Before the operation, the second ignition means blocks the flow outside and inside the second combustion chamber at the notch. When the combustion chamber cup member slides, a gap is formed by the notch and the second ignition means.

The invention of claim 7
The vehicle restraint device gas according to claim 5 or 6, wherein a stopper member is attached to the combustion chamber cup member, and the axial movement of the combustion chamber cup member is restricted by the stopper member. Provide a generator.

  When the degree of expansion of the housing top plate is large, the slidable combustion chamber cup member may come off from the ignition means. However, by attaching the stopper member, the above situation can be prevented from occurring. The stopper member can be formed by providing a protrusion or a recess on the ignition means side and a member corresponding to the protrusion or the recess on the combustion chamber cup member side.

  The gas generator for a person restraining device for a vehicle according to the present invention can reduce the number of parts, reduce the number of steps, facilitate assembly, and reduce the overall weight.

(1) Gas Generator in FIGS. 1 to 3 FIG. 1 is an axial sectional view of a gas generator of the present invention and shows a state before operation. 2 and 3 show the operating state of the gas generator of FIG.

  A housing 11 forming the gas generator 10 of FIG. 1 is a unit in which a diffuser shell 12 and a closure shell 13 are joined and integrated.

  The diffuser shell 12 is formed by integrally forming a top plate 12a and an upper peripheral wall portion 12b, and a plurality of gas discharge ports 14 are provided on the peripheral surface of the upper peripheral wall portion 12b. The gas discharge port 14 is closed by a seal tape 15 made of aluminum or stainless steel attached from the inside.

  The closure shell 13 is integrally formed with a bottom plate 13a and a lower peripheral wall portion 13b. The bottom plate 13a is provided with two holes, and a first ignition means 21 and a second ignition means 25 are welded to the bottom plate 13a, respectively. It is attached with.

  The housing 11 has the lower peripheral wall portion 13b inserted inside the upper peripheral wall portion 12b, and is fixed by welding only at the contact portion (welded portion) 11a.

  The first ignition means 21 has a first igniter 23 fixed to the first igniter collar 22, and the second ignition means 25 is a second igniter 27 fixed to the second igniter collar 26. have. A connector having a lead wire is fitted into each conductive pin portion and connected to the battery.

  A combustion chamber cup member 41 is disposed in the housing 11, the outer side being the first combustion chamber 31, and the inner side being the second combustion chamber 35. The first combustion chamber 31 is filled with the first gas generating agent 30, and the second combustion chamber 35 is filled with the second gas generating agent 33. The second combustion chamber 35 is included in the first combustion chamber 31.

  An enhancer chamber cup member 32 is disposed in the first combustion chamber 31. The enhancer chamber cup member 32 has a peripheral surface 32 b having a closed bottom plate 32 a and a plurality of enhancer holes 34. An opening end 32c is formed on the opposite side of the bottom plate 32a. The enhancer chamber cup member 32 is an enhancer chamber 36 in which the enhancer agent 37 and the first ignition means 21 are accommodated.

  As the enhancer 37, a gas generating agent having a high combustion temperature can be used in addition to the known boron nitrate. The plurality of enhancer holes 34 are covered and closed with a sealing tape 34a such as aluminum.

  The enhancer chamber cup member 32 has an opening end 32 c fitted into the first igniter collar 22, the periphery of the opening is in contact with the bottom plate 13 a, and the bottom 32 a is in contact with the top plate 12 a of the housing 11. . Therefore, the enhancer chamber cup member 32 is positioned by the first igniter collar 22 and fixed so as to be pressed from above and below by the top plate 12a and the bottom plate 13a.

  A disc-shaped retainer 46 for adjusting the volume of the first combustion chamber 31 according to the filling amount of the first gas generating agent 30 is fitted in the first combustion chamber 31. The retainer 46 has two holes, and these two holes are fitted into the combustion chamber cup member 41 and the enhancer chamber cup member 32. In FIG. 1, only the peripheral surface 32 b of the enhancer chamber cup member 32 is press-fitted.

  A cylindrical coolant filter 45 having a function of filtering and cooling combustion gas is disposed outside the first combustion chamber 31, and between the outer peripheral surface of the coolant filter 45 and the gas discharge port 14 and the seal tape 15. A gap is provided.

  The combustion chamber cup member 41 that forms the second combustion chamber 35 is fitted into the second igniter collar 26.

  The combustion chamber cup member 41 includes a closed end portion (bottom portion) 41a, an opening end portion 41b formed on the opposite side, and a peripheral wall portion 41c. No openings or nozzles are formed on the bottom portion 41a and the peripheral wall portion 41c. . The peripheral wall portion 41c includes a small diameter portion 41d, a large diameter portion 41e that occupies most of the peripheral wall portion 41c, and an annular inclined portion 41f that connects the small diameter portion 41d and the large diameter portion 41e. The inner diameter of the small-diameter portion 41d (that is, the inner diameter of the opening) is set to be the same as or slightly smaller than the outer diameter of the second igniter collar 26. For this reason, the combustion chamber cup member 41 is fitted so as to press the outer peripheral surface of the second igniter collar 26 from the outside by the small diameter portion 41d.

  The bottom portion 41 a of the combustion chamber cup member 41 is in contact with the top plate 12 a of the diffuser shell 12, and the open end portion 41 b is in contact with the bottom plate 13 a of the closure shell 13. Therefore, the combustion chamber cup member 41 is positioned by the second igniter collar 26 and is prevented from moving in the axial direction and the radial direction, and is fixed by being pressed from above and below by the top plate 12a and the bottom plate 13a. Has been.

  Next, the operation when the gas generator of FIG. 1 is applied to an automobile airbag system will be described with reference to FIGS. The first igniter 23 and the second igniter 27 are configured so that the first igniter 23 operates first when only the first igniter 23 operates according to the degree of impact received by the automobile at the time of the collision. When the second igniter 27 operates with a delay, the first igniter 23 and the second igniter 27 may operate at the same time. However, in the following, the first igniter 23 operates first and the second ignition The case where the device 27 operates with a delay will be described.

  When the automobile collides and receives an impact, the operation signal is received from the control unit, the first igniter 23 is activated and ignited, and the enhancer agent 37 is ignited and burned. Thereafter, the pressure in the enhancer chamber 36 is increased, so that the seal tape 34 a covering the enhancer hole 34 from the outside is broken, the enhancer hole 34 is opened, and combustion products (ignition energy) are released into the first combustion chamber 31. The

  By this combustion product, the first gas generating agent 30 is ignited and burned to generate high-temperature combustion gas. The combustion gas is filtered and cooled through the coolant filter 45, then breaks the seal tape 15, is discharged from the gas discharge port 14, and inflates the airbag. At this time, in the second combustion chamber 35, the open end 41 b of the combustion chamber cup member 41 is in contact with the bottom plate 13 a, and the second combustion chamber 35 is completely isolated from the first combustion chamber 31. Therefore, the second gas generating agent 33 is not ignited by the combustion gas generated from the first gas generating agent 30.

  As described above, the first gas generating agent 30 in the first combustion chamber 31 burns to generate combustion gas, thereby increasing the pressure inside the housing 11. Since the diffuser shell 12 and the closure shell 13 are joined only at the abutting portion 11a, the housing 11 is deformed so that the top plate 12a and the bottom plate 13a swell due to an increase in pressure inside the housing 11, and the combustion chamber cup member A gap (A shown in FIG. 2) is formed between the bottom 41a and the top plate 12a.

  The second igniter 27 is activated and ignited with a slight delay to ignite and combust the second gas generating agent 33 to generate high-temperature combustion gas. At this time, the internal pressure of the combustion chamber cup member 41 is increased by the high-temperature combustion gas. Then, the combustion chamber cup member 41 is slid in the axial direction as shown in FIG. 3 from the state in which the combustion chamber cup member 41 is press-fitted into the second igniter collar 26, and the opening end 41 b and the second igniter collar 26 are A gap serving as a gas outlet is formed therebetween. The combustion gas generated from the second gas generating agent 33 flows out of the gap in a flow as shown by an arrow in FIG. 3 and flows into the first combustion chamber 31.

  At this time, as indicated by the arrow, the gas flow is downward (in the direction of the bottom plate 13a of the housing), and since the high temperature gas does not directly hit the filter 45, the thermal load on the filter 45 is reduced.

  The enhancer chamber cup member 32 is the same as the method for fixing the combustion chamber cup member 41 in that the open end 32c is fitted into the first igniter collar 22. However, the bottom portion 32 a of the enhancer chamber cup member 32 is in contact with the top plate 12 a of the housing 11, and when the enhancer agent 37 burns, the generated combustion product flows out from the enhancer hole 34 into the first combustion chamber 31. Therefore, the enhancer chamber cup member 32 does not slide in the axial direction.

(2) Gas Generator in FIG. 4 FIG. 4A is a partial cross-sectional view showing a gas generator according to another embodiment of the present invention, in which only a part of the second combustion chamber is enlarged. FIG. 4B is a partial view of FIG. 4A as viewed from above, and FIG. 4C is a view for explaining the operating state of FIG. 4A.

  As shown in FIGS. 4A and 4B, a plurality of grooves 50 are formed in the axial direction on the outer peripheral surface of the second igniter collar 26. The plurality of grooves 50 are formed at equal intervals in the circumferential direction. The groove 50 is formed from a position corresponding to the same plane as the housing bottom plate 13a, and the lower end of the groove 50 is in contact with the housing bottom plate 13a. The groove 50 may be formed from a position corresponding to a position slightly above the same plane as the housing bottom plate 13a (in the case of (II) described above).

  As shown in FIGS. 4A and 4B, a gap is formed between the inner peripheral surface of the small diameter portion 41 d of the combustion chamber cup member and the groove 50 of the second igniter collar 26. Before operation, the open end 41b is in contact with the bottom plate 13a, and the first combustion chamber 31 and the second combustion chamber 35 are not in communication.

  In FIG. 4A, since the groove 50 is formed, the combustion gas generated by the combustion of the first gas generating agent 30 flows into the second combustion chamber 35 as compared with the embodiment of FIG. It becomes easy to do. For this reason, in order to prevent inflow into the 2nd combustion chamber 35, a seal member can also be arranged between opening end 41b and bottom board 13a.

  When the second igniter 26 is activated and the second gas generating agent 33 is combusted, the pressure inside the second combustion chamber 35 rises, and the combustion chamber cup member 41 slides in the axial direction. Then, gas begins to flow through the gap between the groove 50 and the small diameter portion 41d, and as shown in FIG. 4C, the gas flows out between the opening end portion 41b and the bottom plate 13a. At this time, the combustion chamber cup member 41 is not completely detached from the second igniter collar 26.

  Thus, the combustion chamber cup member 41 slightly slides in the axial direction, and the first combustion chamber 31 and the second combustion chamber 35 communicate with each other by the action of the groove 50. For this reason, compared with the gas generator of FIG. 1, the combustion gas from the second combustion chamber 35 is more likely to flow out.

(3) Gas Generator in FIG. 5 FIG. 5 (a) is a partial cross-sectional view showing another embodiment of the gas generator of the present invention, in which only a part of the second combustion chamber is enlarged. FIG. 5B is a partial view of FIG. 5A viewed from above, and FIG. 5C is a diagram for explaining the operating state of FIG. 5A.

  As shown in FIGS. 5A and 5B, a plurality of grooves 60 are formed in the axial direction on the inner peripheral surface of the small diameter portion 41d of the combustion chamber cup member. The plurality of grooves 60 are formed at equal intervals in the circumferential direction.

  As shown in FIGS. 5A and 5B, a gap is formed between the groove 60 of the small diameter portion 41 d of the combustion chamber cup member and the outer peripheral surface of the second igniter collar 26. Before operation, the open end 41b is in contact with the bottom plate 13a, and the first combustion chamber 31 and the second combustion chamber 35 are not in communication.

  In FIG. 5A, since the groove 60 is formed, the combustion gas generated by the combustion of the first gas generating agent 30 flows into the second combustion chamber 35 as compared with the embodiment of FIG. It becomes easy to do. For this reason, in order to prevent inflow into the 2nd combustion chamber 35, a seal member can also be arranged between opening end 41b and bottom board 13a.

  When the second igniter 26 is activated and the second gas generating agent 33 is combusted, the pressure inside the second combustion chamber 35 rises, and the combustion chamber cup member 41 slides in the axial direction. Then, gas begins to flow through the gap between the groove 60 and the outer peripheral surface of the second igniter collar 26, and the gas flows out between the open end 41b and the bottom plate 13a as shown in FIG. At this time, the combustion chamber cup member 41 is not completely detached from the second igniter collar 26.

  Thus, the combustion chamber cup member 41 is slightly slid in the axial direction, and the first combustion chamber 31 and the second combustion chamber 35 are communicated by the action of the groove 60. For this reason, compared with the gas generator of FIG. 1, the combustion gas from the second combustion chamber 35 is more likely to flow out.

(4) Gas Generator in FIG. 6 FIG. 6A is a partial cross-sectional view showing a gas generator according to another embodiment of the present invention, in which only a part of the second combustion chamber is enlarged. FIG. 6B is a perspective view of a part of FIG. 6A, and FIG. 6C is a diagram for explaining the operating state of FIG. 6A.

  As shown in FIGS. 6A and 6B, a plurality of holes 70 are formed in the small diameter portion 41d of the combustion chamber cup member. The plurality of holes 70 are formed at equal intervals in the circumferential direction.

  A pin 71 serving as a stopper member is inserted into one of the holes 70 so as to contact the upper end edge 70 a of the hole 70. The pin 71 is fitted in the insertion hole 72 formed on the outer peripheral surface of the second igniter collar 26. The pin 71 is inserted into the insertion hole 72 after the combustion chamber cup member 41 is filled with the second gas generating agent 33 and fitted into the second igniter collar 26.

  When the second igniter 26 is activated and the second gas generating agent 33 is combusted, the pressure inside the second combustion chamber 35 rises, and the combustion chamber cup member 41 slides in the axial direction. The combustion cup member 41 stops sliding in the axial direction when the pin 71 hits the lower edge 70 b of the hole 70. In this state, since the hole 70 is opened, the combustion gas in the second combustion chamber 35 flows out from the hole 70 into the first combustion chamber 31.

  Thus, the combustion chamber cup member 41 is slightly slid in the axial direction, and the first combustion chamber 31 and the second combustion chamber 35 are communicated by the action of the hole 70. For this reason, compared with the gas generator of FIG. 1, the combustion gas from the second combustion chamber 35 is more likely to flow out.

(5) Gas Generator in FIG. 7 FIG. 7 (a) is a partial cross-sectional view showing a gas generator according to another embodiment of the present invention, in which only a part of the second combustion chamber is enlarged. FIG. 7B is a perspective view of a part of FIG. 7A, and FIG. 7C is a diagram for explaining the operating state of FIG. 7A. FIG.7 (d) is a perspective view of another embodiment of Fig.7 (a), FIG.7 (e) is the elements on larger scale of FIG.7 (d).

  As shown in FIGS. 7A and 7B, the small-diameter portion 41d of the combustion chamber cup member is formed with a plurality of notches 80 and a protruding portion 81 which is the remaining portion. The plurality of notches 80 and the protrusions 81 are formed at equal intervals in the circumferential direction. The tip of the protrusion 81 is a portion corresponding to the opening end 41 b in FIGS. 1 to 6, but the tip is bent inward to form a bent portion 82.

  An annular groove 84 is formed on the outer peripheral surface of the second igniter collar 26. The groove 84 may be formed only on the surface facing the protruding portion 81. Further, an overhanging portion 86 is formed on the outer peripheral surface of the second igniter collar 26 over the entire circumference or only in a portion where the groove 84 is formed. The overhanging portion 86 is rounded.

  As shown in FIGS. 7A and 7B, the inner peripheral surface of the small diameter portion 41 d is in contact with the outer peripheral surface of the overhang portion 86, and the inner peripheral surface of the bent portion 82 is in contact with the outer peripheral surface of the groove 84. Therefore, before the operation, the first combustion chamber 31 and the second combustion chamber 35 are not in communication.

  The structure shown in FIGS. 7A and 7B can be assembled by the following procedure. First, the combustion chamber cup member 41 is fitted into the second igniter collar 26 with the second gas generating agent 33 filled in the combustion chamber cup member 41. At this time, the bent portion 82 is deformed so as to be pushed outward by the rounded overhanging portion 86, and when the bent portion 82 exceeds the overhanging portion 86, the bent portion 82 is pushed out by its own elasticity. Then, it returns to its original shape and comes into contact with the groove 84. The combustion chamber cup member 41 is pushed in as it is until the state shown in FIGS.

  When the second igniter 26 is activated and the second gas generating agent 33 is combusted, the pressure inside the second combustion chamber 35 rises, and the combustion chamber cup member 41 slides in the axial direction. At this time, the bent portion 82 slides in the groove 84 in the axial direction. The combustion cup member 41 stops sliding in the axial direction when the bent portion 82 hits the overhanging portion 86. In this state, the notch 80 is opened, so that the combustion gas in the second combustion chamber 35 flows out from the notch 80 into the first combustion chamber 31.

  Thus, the combustion chamber cup member 41 is slightly slid in the axial direction, and the first combustion chamber 31 and the second combustion chamber 35 are communicated by the action of the notch 80. For this reason, compared with the gas generator of FIG. 1, the combustion gas from the second combustion chamber 35 is more likely to flow out.

  7 (d) and 7 (e), the formation position of the bent portion 82 shown in FIGS. 7 (a) and 7 (b) is changed from the viewpoint of facilitating the fitting of the combustion cup member 41 into the second igniter collar 26. It is an example.

  As shown in FIGS. 7D and 7E, a claw 90 is formed on a part of the lower end portion of the small diameter portion 41d (a portion where the notch portion 80 is not formed). The claw 90 is formed such that three sides are cut and slightly bent from one side that is not cut to the inside (inside the combustion cup member 41). The tip of the claw 90 is slightly bent inward to form a bent portion 91. The bent portion 91 performs the same function as the bent portion 82 shown in FIGS.

  7D and 7E, the claw 90 itself has elasticity, and when the combustion chamber cup member 41 is fitted into the second igniter collar 26, the bent portion 91 is the second igniter collar 26. When hitting the outer peripheral surface, the claw 90 is easily deformed outward. When the fitting of the combustion chamber cup member 41 is completed, the bent portion 91 of the claw portion 90 returns to its original shape and is in contact with the groove 84. In operation, the bent portion 91 is caught by the overhanging portion 86, so that the combustion chamber cup member 41 is prevented from coming off.

The axial direction sectional view of the gas generator of the present invention. The figure for demonstrating the operating state of the gas generator of FIG. The figure for demonstrating the operating state of the gas generator of FIG. (A) is a fragmentary sectional view of embodiment different from the gas generator of FIG. 1, (b) is a fragmentary top view of (a), (c) is a figure for demonstrating the operating state of (a). (A) is a fragmentary sectional view of embodiment different from the gas generator of FIG. 1, (b) is a fragmentary top view of (a), (c) is a figure for demonstrating the operating state of (a). (A) is a fragmentary sectional view of embodiment different from the gas generator of FIG. 1, (b) is a fragmentary perspective view of (a), (c) is a figure for demonstrating the operating state of (a). (A) is a fragmentary sectional view of embodiment different from the gas generator of FIG. 1, (b) is a fragmentary perspective view of (a), (c) is a figure for demonstrating the operating state of (a). (D) is a perspective view of an embodiment different from (a), and (e) is a partially enlarged view of (d).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas generator 11 Housing 11a Welding part 14 Gas discharge port 22 1st igniter collar 23 1st igniter 26 2nd igniter collar 27 2nd igniter 30 1st gas generating agent 31 1st combustion chamber 33 2nd gas Generating agent 35 Second combustion chamber 36 Enhancer chamber 37 Enhancer agent 41 Combustion chamber cup

Claims (6)

A diffuser shell (12) consisting of an upper peripheral wall portion (12b) having a top plate (12a) and a gas discharge port (14) and a closure shell (13) consisting of a bottom plate (13a) and a lower peripheral wall portion (13b) are integrally joined. In the structured housing (11) ,
A first combustion chamber (31) having a first gas generating agent (30) and first ignition means (21), and a second combustion chamber having a second gas generating agent (33) and second ignition means (25) ( 35) is arranged, and further a coolant filter (45) for filtering and cooling the combustion gas is arranged,
The second combustion chamber (35) is separated from the first combustion chamber (31) by a combustion chamber cup member (41) ;
The combustion chamber cup member (41) is fitted into the second ignition means (25) with the opening closed, and receives the pressure when the second ignition means (25) is actuated to receive the shaft. A gas generator for a person restraining device for a vehicle, which slides in a direction and forms a gap for releasing combustion gas between the second ignition means (25) and the open end (41b) .   The gas generator for a vehicle personnel restraint apparatus according to claim 1, wherein the combustion chamber cup member has a minimum opening.   The said 2nd igniter collar has a groove | channel in an axial direction, and when the said combustion chamber cup member slides in an axial direction, the said groove | channel becomes a clearance gap which discharge | releases combustion gas. Gas generator for personnel restraint devices of vehicles.   The combustion chamber cup member has an opening abutted against the housing bottom plate and has a groove reaching the opening on the inner peripheral surface thereof, and the combustion chamber cup member slid in the axial direction. The gas generator for a vehicle personnel restraint device according to claim 1 or 2, wherein the groove becomes a gap for releasing combustion gas.   The combustion chamber cup member has a cutout portion in which an inner peripheral surface in contact with the opening end portion is cut out in the axial direction, and when the combustion chamber cup member slides in the axial direction, the cutout portion is formed. The gas generator for a personnel restraint device for a vehicle according to claim 1, wherein the notch becomes a gap for releasing combustion gas. The gas generator for a vehicle personnel restraint device according to claim 5 , wherein a stopper member is attached to the combustion chamber cup member, and the axial movement of the combustion chamber cup member is limited by the stopper member. .

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