Sealing assembly, gas generating device and safety belt retractor

Abstract

According to the sealing assembly, the gas generation device and the safety belt retractor, the sealing assembly is provided with the exhaust structure on the sealing column to achieve exhaust, the blocking piece is installed in the sealing column in the sealed state, and if the pressure value of the gas pressure is smaller than the preset air pressure value, the blocking piece is subjected to the gas pressure but does not deform; if the gas pressure is larger than or equal to the preset gas pressure value, deformation can be generated to relieve the sealing state of the blocking piece relative to the sealing column, then the gas pressure is exhausted from the exhaust structure of the sealing column in the direction different from the extending direction, and therefore the impact of the gas pressure on the elbow is relieved, and the integrity of the elbow is guaranteed; therefore, the gas generating device can be normally used. In addition, the supporting base is connected to one end of the sealing column in an embedded mode, the blocking piece is supported and stabilized, and meanwhile the driving ball can be contained. Or when receiving the counter-acting force of the driving ball, the blocking piece is promoted to deform.

Description

Technical Field

[0001] The present application relates to the field of automobile safety technology, and in particular to a sealing component, a gas generating device and a seat belt retractor. Background Art

[0002] As people's living standards continue to improve, cars have become one of the indispensable means of transportation for people to travel, and people's requirements for car safety are getting higher and higher. Among them, the gas generator is one of the important components of the car safety system. During the driving process of the car, in the event of a collision, the gas generator can work to trigger the seat belt retractor and cooperate with the seat belt to restrain the passenger in the seat, which can protect the life safety of the passenger and avoid injury to the passenger.

[0003] At present, the gas generated by the gas generating device in its bent pipe may deform or break due to excessive gas pressure, thereby affecting the normal use of the gas generating device and further affecting the life safety of passengers.

[0004] Therefore, how to ensure the normal use of the gas generating device to protect the life safety of passengers has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The present application provides a sealing assembly to solve the problem in the prior art of how to ensure the normal use of a gas generating device to protect the life safety of passengers. The present application also provides a gas generating device and a seat belt retractor.

[0006] The present application provides a sealing assembly installed in a curved pipe of a gas generating device of a seat belt retractor, characterized in that it comprises: a sealing column, a baffle and a supporting base;

[0007] The sealing column can be installed in the elbow, and the sealing column has an exhaust structure;

[0008] The blocking piece is installed inside the sealing column in a sealed state; the blocking piece is deformable;

[0009] The support base is embedded in one end of the sealing column and abuts against the blocking piece at the same time to fix the blocking piece in the sealing column;

[0010] When the sealing assembly is subjected to gas pressure along the extension direction of the bent pipe, if the pressure value of the gas pressure is less than a preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; if the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, the gas pressure will be transmitted to the baffle to cause the baffle to deform, thereby releasing the sealing state of the baffle relative to the sealing column, and then allowing the gas pressure to be discharged from the exhaust structure of the sealing column along a direction different from the extension direction.

[0011] Optionally, the exhaust structure includes an exhaust groove and a through hole;

[0012] The through hole is arranged along the axial direction of the main body of the sealing column; the main body of the sealing column can be inserted into the bent pipe, and the axial direction of the main body of the sealing column is parallel or colinear with the axial direction of the bent pipe;

[0013] The exhaust groove is arranged along the circumference of the main body of the sealing column, and the notch direction of the exhaust groove is perpendicular to the axial direction of the main body of the sealing column;

[0014] When the baffle is installed inside the sealing column in a sealed state, the exhaust groove and the through hole are separated, and the exhaust groove does not exhaust air; when the sealing state of the baffle relative to the sealing column is released, the exhaust groove and the through hole are connected, and the exhaust groove exhausts air.

[0015] Optionally, the exhaust groove includes a plurality of exhaust holes; the plurality of exhaust holes are arranged along the circumference of the main body of the sealing column, and each of the exhaust holes is connected to the through hole.

[0016] Optionally, the sealing column comprises a first section column structure, a second section column structure and a third section column structure which are connected in sequence; the exhaust groove is arranged at the second section column structure of the sealing column.

[0017] Optionally, the through hole comprises a first section of through holes, a second section of through holes and a third section of through holes which are sequentially connected along the axial direction of the main body of the sealing column;

[0018] The first section through hole is arranged along the central axis of the first section pillar structure;

[0019] The second section through hole is arranged along the central axis of the second section column structure and is opposite to the exhaust groove; and the cross section of the second section through hole in the axial direction of the main body of the sealing column is trapezoidal;

[0020] The third section through hole is arranged along the central axis of the third section pillar structure;

[0021] The aperture of the first section of through holes is smaller than the aperture of the second section of through holes; and the aperture of the second section of through holes is smaller than the aperture of the third section of through holes.

[0022] Optionally, the blocking piece is in the shape of a cap, and the blocking piece includes a sealing portion and an abutting portion which are integrally formed;

[0023] In the axial direction of the main body of the sealing column, the cross section of the sealing portion is trapezoidal, the sealing portion is adapted to the second section through hole, and the sealing portion can be sealingly installed at the second section through hole;

[0024] The abutting portion abuts against the third section through hole.

[0025] Optionally, the support base includes an integrally formed abutment end and a receiving end;

[0026] The abutting end abuts against the abutting portion of the blocking piece to position the blocking piece in the first section through hole and the second section through hole;

[0027] The accommodating end is provided with a ball concave structure, and the ball concave structure is in contact with the driving ball of the gas generating device.

[0028] Optionally, an exhaust groove is provided on the end surface of the abutment portion of the abutment end facing the baffle; the exhaust groove can discharge the air pressure in the enclosed space formed by the baffle and the support base to deform the baffle.

[0029] The present application also provides a gas generating device, characterized in that it comprises: a gas generator, a bent pipe, a driving ball and the sealing assembly described above;

[0030] The gas generator is arranged at one end of the bent pipe, and the sealing assembly and the driving ball are arranged in the bent pipe in sequence;

[0031] The gas generator can generate high-pressure gas when working to push the sealing component to move, and the sealing component then pushes the driving ball to rotate; the sealing component is subjected to gas pressure along the extension direction of the bent pipe, and if the pressure value of the gas pressure is less than the preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; when the tail resistance of the bent pipe is too large, the sealing component cannot be pushed, or the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, so that the gas pressure is transmitted to the baffle to cause the baffle to deform, so as to release the sealing state of the baffle relative to the sealing column, and then the gas pressure is discharged from the exhaust structure of the sealing column along a direction different from the extension direction.

[0032] The present application also provides a seat belt retractor, characterized in that it comprises the gas generating device described above.

[0033] Compared with the prior art, this application has the following advantages:

[0034] The present application provides a sealing assembly installed in a curved pipe of a gas generating device of a seat belt retractor, comprising: a sealing column, a baffle and a supporting base; wherein the sealing column can be installed in the curved pipe, and the sealing column has an exhaust structure. The baffle is installed inside the sealing column in a sealed state, and the baffle can be deformed. The supporting base is embedded in one end of the sealing column, and at the same time abuts the baffle to fix the baffle in the sealing column. When the sealing assembly is subjected to gas pressure along the extension direction of the curved pipe, if the pressure value of the gas pressure is less than a preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; if the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, the gas pressure will be transmitted to the baffle to cause the baffle to deform, so as to release the sealing state of the baffle relative to the sealing column, and then the gas pressure is discharged from the exhaust structure of the sealing column along a direction different from the extension direction.

[0035] The sealing assembly provided by the present application realizes exhaust by providing an exhaust structure on the sealing column, and the baffle is installed inside the sealing column in a sealed state, and can be deformed when subjected to a gas pressure greater than or equal to a preset gas pressure value, so as to release the sealing state of the baffle relative to the sealing column, and then the gas pressure is discharged from the exhaust structure of the sealing column along a direction different from the extension direction, thereby reducing the direct impact of the gas pressure on the elbow, thereby ensuring the integrity of the elbow, and allowing the normal use of the gas generating device. In addition, the support base is embedded in one end of the sealing column, and while supporting and stabilizing the baffle, it can also accommodate a driving ball. Or when receiving the reaction force of the driving ball, it can cause the baffle to deform. The sealing assembly of the present application has a simple structure, and can quickly decompose the gas pressure along the extension direction of the elbow to reduce the direct impact of the gas pressure on the elbow, thereby ensuring the integrity of the elbow, and allowing the normal use of the gas generating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a sealing assembly provided in an embodiment of the present application.

[0037] Figure 2 It is a cross-sectional view of the sealing assembly provided in an embodiment of the present application.

[0038] Figure 3 It is an exploded view of the sealing assembly provided in an embodiment of the present application.

[0039] Figure 4 It is a schematic diagram of the sealing column structure provided in an embodiment of the present application.

[0040] Figure 5 It is a schematic diagram of the structure of the baffle provided in the embodiment of the present application.

[0041] Figure 6 It is a schematic diagram of the structure of the support base 4 provided in an embodiment of the present application.

[0042] Figure 7 It is a structural schematic diagram of the support base 4 provided in an embodiment of the present application from another angle.

[0043] Figure 8 It is a structural schematic diagram of a partial structure of a seat belt retractor provided in an embodiment of the present application.

[0044] Reference numerals:

[0045] Sealing assembly 100, sealing column 1, exhaust structure 2, exhaust groove 21, exhaust hole 211, through hole 22, baffle 3, sealing portion 31, abutment portion 32, support base 4, abutment end 41, accommodating end 42, ball concave structure 421, exhaust groove 43, gas generating device 200, driving ball 300, DETAILED DESCRIPTION

[0046] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0047] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] At present, the gas generated by the gas generating device in its bent pipe may deform or break due to excessive gas pressure, thereby affecting the normal use of the gas generating device and further affecting the life safety of passengers.

[0050] Based on this, the present application provides a sealing assembly installed in the bent pipe of the gas generating device of the seat belt retractor, including: a sealing column, a baffle and a supporting base; wherein the sealing column can be installed in the bent pipe, and the sealing column has an exhaust structure. The baffle is installed inside the sealing column in a sealed state, and the baffle can be deformed. The supporting base is embedded in one end of the sealing column, and at the same time abuts the baffle to fix the baffle in the sealing column. When the sealing assembly is subjected to gas pressure along the extension direction of the bent pipe, if the pressure value of the gas pressure is less than the preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; if the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, the gas pressure will be transmitted to the baffle to cause the baffle to deform, so as to release the sealing state of the baffle relative to the sealing column, and then the gas pressure is discharged from the exhaust structure of the sealing column along a direction different from the extension direction.

[0051] It can be understood that the sealing assembly provided by the present application realizes exhaust by setting an exhaust structure on the sealing column, and the baffle is installed inside the sealing column in a sealed state, and can be deformed when subjected to a gas pressure greater than or equal to a preset gas pressure value, so as to release the sealing state of the baffle relative to the sealing column, and then the gas pressure is discharged from the exhaust structure of the sealing column along a direction different from the extension direction, thereby reducing the direct impact of the gas pressure on the elbow, thereby ensuring the integrity of the elbow, and allowing the normal use of the gas generating device. In addition, the support base is embedded in one end of the sealing column, and while supporting and stabilizing the baffle, it can also accommodate a driving ball. Or when receiving the reaction force of the driving ball, it can cause the baffle to deform. The sealing assembly of the present application has a simple structure, and can quickly decompose the gas pressure along the extension direction of the elbow to reduce the direct impact of the gas pressure on the elbow, thereby ensuring the integrity of the elbow, and allowing the normal use of the gas generating device.

[0052] Next, the sealing assembly provided by the present application will be described in detail with reference to the accompanying drawings. Figure 1 It is a structural schematic diagram of a sealing assembly provided in an embodiment of the present application. Figure 2 It is a cross-sectional view of the sealing assembly provided in an embodiment of the present application. Figure 3 It is an exploded view of the sealing assembly provided in an embodiment of the present application. Figure 4 It is a schematic diagram of the sealing column structure provided in an embodiment of the present application. Figure 5 It is a schematic diagram of the structure of the baffle provided in the embodiment of the present application. Figure 6 It is a schematic diagram of the structure of the support base 4 provided in an embodiment of the present application. Figure 7 It is a structural schematic diagram of the support base 4 provided in an embodiment of the present application from another angle. Figure 8 It is a structural schematic diagram of a partial structure of a seat belt retractor provided in an embodiment of the present application.

[0053] like Figures 1 to 8As shown, the present application provides a sealing assembly 100, which is installed in the bent pipe of the gas generating device 200 of the seat belt retractor, and the sealing assembly 100 includes: a sealing column 1, a baffle 3 and a supporting base 4. Among them, the sealing column 1 can be installed in the bent pipe, and the sealing column 1 has an exhaust structure 2. The baffle 3 is installed inside the sealing column 1 in a sealed state, and the baffle 3 can be deformed. The supporting base 4 is embedded at one end of the sealing column 1, and at the same time abuts the baffle 3 to fix the baffle 3 in the sealing column 1. When the sealing assembly 100 is subjected to gas pressure along the extension direction of the bent pipe, if the pressure value of the gas pressure is less than the preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; if the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, the gas pressure will be transmitted to the baffle 3 to cause the baffle 3 to deform, so as to release the sealing state of the baffle 3 relative to the sealing column 1, and then the gas pressure is discharged from the exhaust structure 2 of the sealing column 1 along a direction different from the extension direction.

[0054] Specifically, in this embodiment, the sealing column 1 is in the shape of a pillar as a whole. Specifically, the sealing column 1 includes a first-stage pillar structure, a second-stage pillar structure and a third-stage pillar structure that are sequentially connected, and the three-stage pillar structures are sequentially connected and integrally formed to form a sealing column 1 in the shape of a pillar. In one example, the size of the first-stage pillar structure is greater than the size of the second-stage pillar structure, the size of the second-stage pillar structure is smaller than the size of the third-stage pillar structure, and the size of the third-stage pillar structure is smaller than the size of the second-stage pillar structure. In one example, of course, the size of the first-stage pillar structure is greater than the size of the second-stage pillar structure, and the size of the second-stage pillar structure is equal to the size of the third-stage pillar structure. In other examples, the sealing column 1 includes a first-stage pillar structure and a second-stage pillar structure that are sequentially connected, and the two-stage pillar structures are sequentially connected and integrally formed to form a sealing column 1 in the shape of a pillar. In one example, the size of the first-stage pillar structure is greater than the size of the second-stage pillar structure. The exhaust structure 2 is relatively arranged at the position where the second-stage pillar structure is located, so that it is convenient to exhaust while achieving sealing. That is, the first section of the column structure has a large size for sealing, and the second section of the column has a small size for exhaust.

[0055] In other examples, the sealing column 1 is in the shape of a column, specifically a cylindrical shape. The sealing column 1 is set as a column as a whole, mainly to adapt to the structure of the bent pipe of the gas generating device 200, so that the sealing column 1 can be installed in the bent pipe. Specifically, the bent pipe of the gas generating device 200 is generally cylindrical, and the sealing column 1 is set as a column as a whole so that the outer end face of the sealing column 1 can be fitted and slid with the inner wall of the bent pipe. And while fitting and sliding, the outer end face of the sealing column 1 has a certain degree of sealing relative to the inner wall of the bent pipe. That is, in one example, the sealing component 100 is subjected to gas pressure along the extension direction of the bent pipe. If the pressure value of the gas pressure is less than the preset air pressure value (the preset air pressure value is determined at the bend of the sealing component 100 at the bent pipe according to the morphological structure of the bent pipe), the baffle is subjected to gas pressure but does not deform. In one case, the pressure value of the gas pressure is less than the preset air pressure value, but the sealing component 100 can be driven by the air pressure to move in the bent pipe. If the pressure value of the gas pressure is greater than or equal to the preset pressure value, the gas pressure will be transmitted to the baffle 3 to deform the baffle 3, so as to release the sealing state of the baffle 3 relative to the sealing column 1, and then the gas pressure will be discharged from the exhaust structure of the sealing column 1 in a direction different from the extension direction. In one case, that is, the pressure value of the gas pressure is greater than or equal to the preset pressure value, but the sealing component 100 is blocked when being driven by the gas pressure to the bending structure of the elbow, and then the sealing component 100 cannot move and generates resistance, then the gas pressure will be transmitted to the baffle 3 to deform the baffle 3, so as to release the sealing state of the baffle 3 relative to the sealing column 1, and then the gas pressure will be discharged from the exhaust structure of the sealing column 1 in a direction different from the extension direction. .

[0056] In addition, based on the external shape of the sealing column 1, that is, the sealing column 1 includes at least a first section of a column structure and a second section of a column structure, and the size of the first section of the column structure is larger than that of the second section of the column structure, the exhaust structure 2 is arranged relative to the position of the second section of the column structure so that there is a gap between the exhaust structure 2 and the inner wall of the bent pipe so that exhaust can be discharged through the gap.

[0057] The sealing column 1 has an exhaust structure 2. Specifically, in the present embodiment, the exhaust structure 2 includes an exhaust groove 21 and a through hole 22. Among them, the through hole 22 is arranged along the axial direction of the main body of the sealing column 1. The main body of the sealing column 1 can be embedded in the curved pipe, and the axial direction of the main body of the sealing column 1 is parallel or colinear with the axial direction of the curved pipe, so as to facilitate the movement of the main body of the sealing column 1 in the curved pipe. The exhaust groove 21 is arranged along the circumferential direction of the main body of the sealing column 1, and the groove direction of the exhaust groove 21 is perpendicular to the axial direction of the main body of the sealing column 1. When the baffle 3 is installed inside the sealing column 1 in a sealed state, the exhaust groove 21 and the through hole 22 are separated, and the exhaust groove 21 does not exhaust. When the sealing state of the baffle 3 relative to the sealing column 1 is released, the exhaust groove 21 and the through hole 22 are connected, and the exhaust groove 21 is exhausted.

[0058] Further, in this embodiment, corresponding to the specific structure of the sealing column 1, the through hole 22 includes a first section through hole, a second section through hole and a third section through hole which are sequentially connected along the main body axial direction of the sealing column 1. Among them, the first section through hole is arranged along the central axis of the first section column structure. The second section through hole is arranged along the central axis of the second section column structure and is opposite to the exhaust groove 21. And the cross section of the second section through hole in the main body axial direction of the sealing column 1 is trapezoidal. The third section through hole is arranged along the central axis of the third section column structure; wherein the central axes of the first section column structure, the second section column structure and the third section column structure are respectively on a straight line, and the first section through hole, the second section through hole and the third section through hole are sequentially connected. In one example, the aperture of the first section through hole is smaller than the aperture of the second section through hole, and the aperture of the second section through hole is smaller than the aperture of the third section through hole. Of course, in other examples, the aperture size relationship between the first section through hole, the second section through hole and the third section through hole can also be other. For example, the aperture of the first section of through holes is larger than the aperture of the second section of through holes, the aperture of the second section of through holes is smaller than the aperture of the third section of through holes, and so on.

[0059] It should be noted that, in this embodiment, the hole shape of the first section through hole is columnar, the hole shape of the second section through hole is trapezoidal, and the hole shape of the first section through hole is irregular columnar. The hole shape of each section through hole needs to be set according to the specific structure of the baffle 3 and the support base 4.

[0060] The exhaust groove 21 is arranged at the second section of the column structure of the sealing column 1. The exhaust groove 21 is arranged along the circumference of the main body of the sealing column 1, and the groove direction of the exhaust groove 21 is perpendicular to the axial direction of the main body of the sealing column 1. Specifically, in the present embodiment, the exhaust groove 21 includes a plurality of exhaust holes 211. The plurality of exhaust holes 211 are arranged along the circumference of the main body of the sealing column 1, and each exhaust hole 211 is connected with the through hole 22. In one example, the radial cross-section of the exhaust hole 211 is trapezoidal. The exhaust hole 211 includes a connecting port and an exhaust port, the area of ​​the connecting port is smaller than the area of ​​the exhaust port, the connecting port is connected with the through hole 22, and the exhaust port passes through the circumferential end surface of the main body of the sealing column 1. Therefore, after the gas passes through the through hole 22 along the axial direction of the main body of the sealing column 1, it is discharged through the exhaust hole 211 along the axial direction of the main body of the sealing column 1, so that the gas pressure along the extension direction of the bent pipe can be quickly decomposed to reduce the direct impact of the gas pressure on the bent pipe, thereby ensuring the integrity of the bent pipe and allowing the gas generating device 200 to be used normally.

[0061] In addition, the exhaust hole 211 is arranged along the radial direction of the main body of the sealing column 1 to have a structure with a smaller connection port and a larger exhaust port, so that when the exhaust hole 211 is connected to the through hole 22, the gas in the through hole 22 can be quickly discharged.

[0062] Of course, in other examples, the structure of the exhaust hole 211 can be other, and this example does not make any specific restrictions. As long as the structure of the exhaust hole 211 can allow the gas pressure to be discharged from the exhaust structure 2 of the sealing column 1 along a direction different from the extension direction, it is within the scope of protection of this embodiment.

[0063] The baffle 3 is installed in the sealing column 1 in a sealed state, and the baffle 3 can be deformed. Specifically, in the present embodiment, the baffle 3 is in the shape of a cap, and the outer part of the baffle 3 is in the shape of a cap, and the inner part is set as a hollow structure. In one example, the baffle 3 includes an integrally formed sealing portion 31 and an abutting portion 32. It can be understood that, in combination with the baffle 3 being in the shape of a cap, the sealing portion 31 is the "cap top position" of the baffle 3 in the shape of a cap, and the abutting portion 32 is the "cap edge position" of the baffle 3 in the shape of a cap. In the present embodiment, the baffle 3 is specifically installed in the second section through hole and the third section through hole (the part connected to the second section through hole). Specifically, corresponding to the structural form of the second section through hole and the third section through hole, in the main body axial direction of the sealing column 1, the cross section of the sealing portion 31 is trapezoidal, and the structural form of the sealing portion 31 is adapted to the structural form of the second section through hole, so that the sealing portion 31 can be sealed and installed in the second section through hole. A groove in the shape of a trapezoidal body is provided on the inner side of the sealing portion 31. The abutting portion 32 abuts against the third through hole. A cylindrical groove is provided on the inner side of the abutting portion 32. The radial dimension of the abutting portion 32 is greater than the radial dimension of the sealing portion 31, so that when the abutting portion 32 is installed in the third through hole, it can be limited by the third through hole to move toward the second through hole, thereby limiting the freedom of the blocking piece 3 relative to the moving direction of the second through hole.

[0064] In this embodiment, in order to further fix the baffle 3 in the second section through hole and the third section through hole, the support base 4 is embedded in one end of the sealing column 1, and the baffle 3 is abutted at the same time to fix the baffle 3 in the sealing column 1. In one example, the support base 4 is embedded in the third section through hole. Specifically, the support base 4 includes an abutting end 41 and a receiving end 42 formed in one piece, wherein the abutting end 41 abuts against the abutting portion 32 of the baffle 3 to position the baffle 3 in the first section through hole and the second section through hole. In one example, corresponding to the structure of the abutting portion 32 of the baffle 3, the abutting end 41 is configured as a cylindrical shape as a whole, and the cylindrical shape is adapted to the inner groove of the abutting portion 32, so that it can be embedded in the inner groove of the abutting portion 32. The receiving end 42 is provided with a ball recess structure 421, and the ball recess structure 421 contacts the driving ball 300 of the gas generating device 200. The receiving end 42 is embedded in a portion of the third section through hole.

[0065] Further, in the present embodiment, in order to timely remove the air pressure in the enclosed space formed by the baffle 3 and the support base 4, so that the baffle 3 can be deformed in time, an exhaust groove 43 is provided on the end surface of the abutting portion 32 of the abutting end 41 facing the baffle 3. The exhaust groove 43 can remove the air pressure in the enclosed space formed by the baffle 3 and the support base 4, so that the baffle 3 is deformed. In one example, the exhaust groove 43 is connected to the edge of the end surface of the abutting portion 32, and the exhaust groove 43 is radially arranged along the end surface of the abutting portion 32. One exhaust groove 43 can be provided, and the groove wall of the exhaust groove 43 is provided as a stepped structure. In one example, the exhaust groove 43 is provided as a "cross" structure, and the exhaust groove 43 of the "cross" structure can increase the number of grooves of the exhaust groove 43, thereby increasing the exhaust volume, so that the air pressure in the enclosed space formed by the baffle 3 and the support base 4 can be quickly removed, so that the baffle 3 can be quickly deformed.

[0066] The present application provides a sealing assembly 100, which is installed in a curved pipe of a gas generating device 200 of a seat belt retractor, and includes: a sealing column 1, a baffle 3 and a supporting base 4; wherein the sealing column 1 can be installed in the curved pipe, and the sealing column 1 has an exhaust structure 2. The baffle 3 is installed inside the sealing column 1 in a sealed state, and the baffle 3 can be deformed. The supporting base 4 is embedded in one end of the sealing column 1, and at the same time abuts the baffle 3 to fix the baffle 3 in the sealing column 1. When the sealing assembly 100 is subjected to gas pressure along the extension direction of the curved pipe, if the pressure value of the gas pressure is less than the preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; if the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, the gas pressure will be transmitted to the baffle 3 to cause the baffle 3 to deform, so as to release the sealing state of the baffle 3 relative to the sealing column 1, and then the gas pressure is discharged from the exhaust structure 2 of the sealing column 1 along a direction different from the extension direction.

[0067] It can be understood that the sealing assembly 100 provided by the present application realizes exhaust by setting an exhaust structure 2 on the sealing column 1, and the baffle 3 is installed in the sealing column 1 in a sealed state, and can be deformed when subjected to a gas pressure greater than or equal to a preset gas pressure value, so as to release the sealing state of the baffle 3 relative to the sealing column 1, and then the gas pressure is discharged from the exhaust structure 2 of the sealing column 1 along a direction different from the extension direction, thereby reducing the impact of the gas pressure directly on the elbow, thereby ensuring the integrity of the elbow, so that the gas generating device 200 can be used normally. In addition, the support base 4 is embedded in one end of the sealing column 1, and while supporting and stabilizing the baffle 3, it can also accommodate the driving ball 300. Or when receiving the reaction force of the driving ball 300, it can cause the baffle 3 to deform. The sealing assembly 100 of the present application has a simple structure, and can quickly decompose the gas pressure along the extension direction of the elbow to reduce the impact of the gas pressure directly on the elbow, thereby ensuring the integrity of the elbow, so that the gas generating device 200 can be used normally.

[0068] The present application also provides a gas generating device 200, comprising a gas generator, a curved pipe, a driving ball 300 and the above-mentioned sealing assembly 100. The specific structure of the sealing assembly 100 can be found in the description of the above embodiment, and will not be repeated here.

[0069] The gas generator is arranged at one end of the elbow, and the sealing assembly 100 and the driving ball 300 are arranged in the elbow in sequence. When the gas generator is working, it can generate high-pressure gas to push the sealing assembly to move, and the sealing assembly then pushes the driving ball 300 to rotate; if the pressure value of the gas pressure is less than the preset pressure value, the baffle is subjected to the gas pressure but does not deform; when the tail resistance of the elbow is too large, the sealing assembly cannot be pushed, or the pressure value of the gas pressure is greater than or equal to the preset pressure value, so that the gas pressure is transmitted to the baffle 3 to deform the baffle 3, so as to release the sealing state of the baffle 3 relative to the sealing column 1, and then the gas pressure is discharged from the exhaust structure 2 of the sealing column 1 along a direction different from the extension direction, thereby reducing the direct impact of the gas pressure on the elbow, thereby ensuring the integrity of the elbow, and allowing the normal use of the gas generating device 200.

[0070] The present application also provides a seat belt retractor, comprising the gas generating device 200 described above.

[0071] It should be noted that, although several structures, components or units for realizing related functions are mentioned in the above detailed description, such division is not mandatory. In fact, according to the specific implementation of the present application, the features and functions of two or more structures, components or units described above can be concretized in one structure, component or unit. Conversely, the features and functions of one structure, component or unit described above can be further divided into multiple components, structures or units to be concretized.

[0072] In addition, although the components and the installation methods of the components or devices in the present application are described in a specific order in the drawings, this does not require or imply that the components or devices must be designed according to the specific components or the installation methods of the components, or that all the components shown must be included to achieve the desired results. Additionally or alternatively, some components can be omitted, multiple components can be combined into one component to achieve corresponding functions, and / or one component can be decomposed into multiple components to achieve corresponding functions, etc.

[0073] Although the present application is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present application. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A sealing assembly installed in a curved pipe of a gas generating device of a seat belt retractor, characterized in that: include: Sealing column, baffle and supporting base; The sealing column can be installed in the elbow, and the sealing column has an exhaust structure; The blocking piece is installed inside the sealing column in a sealed state; the blocking piece is deformable; The support base is embedded in one end of the sealing column and abuts against the blocking piece at the same time to fix the blocking piece in the sealing column; When the sealing assembly is subjected to gas pressure along the extension direction of the bent pipe, if the pressure value of the gas pressure is less than a preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; if the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, the gas pressure will be transmitted to the baffle to cause the baffle to deform, thereby releasing the sealing state of the baffle relative to the sealing column, and then allowing the gas pressure to be discharged from the exhaust structure of the sealing column along a direction different from the extension direction.

2. The sealing assembly according to claim 1, characterized in that: The exhaust structure includes an exhaust groove and a through hole; The through hole is arranged along the axial direction of the main body of the sealing column; the main body of the sealing column can be inserted into the bent pipe, and the axial direction of the main body of the sealing column is parallel or colinear with the axial direction of the bent pipe; The exhaust groove is arranged along the circumference of the main body of the sealing column, and the notch direction of the exhaust groove is perpendicular to the axial direction of the main body of the sealing column; When the baffle is installed inside the sealing column in a sealed state, the exhaust groove and the through hole are separated, and the exhaust groove does not exhaust air; when the sealing state of the baffle relative to the sealing column is released, the exhaust groove and the through hole are connected, and the exhaust groove exhausts air.

3. The sealing assembly according to claim 2, characterized in that: The exhaust groove includes a plurality of exhaust holes; the plurality of exhaust holes are arranged along the circumference of the main body of the sealing column, and each of the exhaust holes is connected to the through hole.

4. The sealing assembly according to claim 2, characterized in that: The sealing column comprises a first column structure, a second column structure and a third column structure which are connected in sequence; the exhaust groove is arranged at the second column structure of the sealing column.

5. The sealing assembly according to claim 4, characterized in that: The through hole comprises a first section through hole, a second section through hole and a third section through hole which are sequentially connected along the axial direction of the main body of the sealing column; The first section through hole is arranged along the central axis of the first section pillar structure; The second section through hole is arranged along the central axis of the second section column structure and is opposite to the exhaust groove; and the cross section of the second section through hole in the axial direction of the main body of the sealing column is trapezoidal; The third section through hole is arranged along the central axis of the third section pillar structure; The aperture of the first section of through holes is smaller than the aperture of the second section of through holes; and the aperture of the second section of through holes is smaller than the aperture of the third section of through holes.

6. The sealing assembly according to claim 5, characterized in that The blocking piece is in the shape of a cap, and comprises a sealing portion and an abutting portion which are integrally formed; In the axial direction of the main body of the sealing column, the cross section of the sealing portion is trapezoidal, the sealing portion is adapted to the second section through hole, and the sealing portion can be sealingly installed at the second section through hole; The abutting portion abuts against the third section through hole.

7. The sealing assembly according to claim 6, characterized in that: The support base includes an integrally formed abutment end and a receiving end; The abutting end abuts against the abutting portion of the blocking piece to position the blocking piece in the first section through hole and the second section through hole; The accommodating end is provided with a ball concave structure, and the ball concave structure is in contact with the driving ball of the gas generating device.

8. The sealing assembly according to claim 7, characterized in that: An exhaust groove is provided on the end surface of the abutment portion of the abutment end facing the baffle; the exhaust groove can exhaust the air pressure in the closed space formed by the baffle and the support base to deform the baffle.

9. A gas generating device, characterized in that: include: A gas generator, a bent pipe, a driving ball, and a sealing assembly as described in any one of claims 1 to 8; The gas generator is arranged at one end of the bent pipe, and the sealing assembly and the driving ball are arranged in the bent pipe in sequence; The gas generator can generate high-pressure gas when working to push the sealing component to move, and the sealing component then pushes the driving ball to rotate; the sealing component is subjected to gas pressure along the extension direction of the bent pipe, and if the pressure value of the gas pressure is less than the preset gas pressure value, the baffle is subjected to the gas pressure but does not deform; when the tail resistance of the bent pipe is too large, the sealing component cannot be pushed, or the pressure value of the gas pressure is greater than or equal to the preset gas pressure value, so that the gas pressure is transmitted to the baffle to cause the baffle to deform, so as to release the sealing state of the baffle relative to the sealing column, and then the gas pressure is discharged from the exhaust structure of the sealing column along a direction different from the extension direction.

10. A seat belt retractor, characterized in that: Comprising the gas generating device as claimed in claim 9 above.

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