Side air curtain

Abstract

The side air curtain comprises a bag, the bag comprises a front protection cavity, a rear protection cavity and a buffer area, the buffer area is arranged between the front protection cavity and the rear protection cavity, an air passing cavity is formed between the buffer area and the edge of the top end of the bag, and the air passing cavity is communicated with the front protection cavity, the rear protection cavity and the buffer area. The buffering area comprises a front buffering cavity and a rear buffering cavity, the longitudinal part of the front buffering cavity is at least used for being arranged corresponding to an automobile B column, and the transverse part at least extends and crosses an automobile front row seat backrest. The rear buffer cavity is at least used for being arranged corresponding to a seat-free area between an automobile B column and a rear row seat. According to the side air curtain, a large amount of air can firstly enter the front protection cavity and the rear protection cavity to fill the front protection cavity and the rear protection cavity, and the problem that the protection cavities are difficult to fill rapidly when an existing side air curtain deals with a small-volume air generator is solved by increasing the area of the buffer area.

Description

Technical Field

[0001] The invention relates to the technical field of safety airbags, and in particular to a side air curtain. Background Art

[0002] Side air curtains usually include a protective cavity, a buffer cavity and a non-inflated area, so that when the gas generator is ignited, the protective cavity can be quickly filled and the protective cavity can be quickly deployed in the event of a collision to protect the occupants.

[0003] In the prior art, a small inflation channel is usually arranged between the buffer cavity and the protection cavity or a non-inflated area is formed between the protection cavities so that the airflow flows to the protection cavity preferentially. However, in a certain area of ​​the traditional side air curtain, usually a non-inflated area and a small inflation channel are arranged alternatively. Therefore, when dealing with a small-volume gas generator, because the small-volume gas generator has a small gas volume, the non-inflated area and the small inflation channel cannot effectively guide the gas to flow to the protection cavity. Finally, the protection cavity is difficult to be quickly filled, resulting in a smaller coverage area of ​​the protection cavity or a smaller thickness of the protection cavity, making it difficult to effectively protect the occupant.

[0004] At present, no effective solution has been proposed for the problem that the existing side air curtains are difficult to quickly fill the protection cavity when dealing with small-volume gas generators. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a side air curtain to at least solve the problem that the existing side air curtain is difficult to quickly fill the protection cavity when dealing with a small-volume gas generator.

[0006] The embodiment of the present invention provides the following technical solutions:

[0007] An embodiment of the present invention provides a side air curtain, comprising a bag, the bag comprising a front protection cavity and a rear protection cavity, and further comprising a buffer region, the buffer region being arranged between the front protection cavity and the rear protection cavity, and a gas passage cavity being formed between the buffer region and a top edge of the bag, the gas passage cavity being connected to the front protection cavity, the rear protection cavity and the buffer region respectively;

[0008] The buffer area includes:

[0009] A front buffer cavity, the front buffer cavity is arranged close to the front protection cavity and has an L-shaped structure, the longitudinal portion of the front buffer cavity is at least used to correspond to the B-pillar, and the transverse portion at least extends over the backrest of the front seat of the car;

[0010] A rear buffer chamber, the rear buffer chamber is located between the rear protection chamber and the front buffer chamber, and a primary air passage is formed between the rear buffer chamber and the front buffer chamber, the primary air passage is used to allow gas to enter the front buffer chamber and the rear buffer chamber, and the rear buffer chamber is at least used to correspond to the seat-free area between the B-pillar and the rear seats of the automobile;

[0011] A non-inflatable portion, wherein the non-inflatable portion is disposed in the rear buffer cavity and divides the rear buffer cavity into a primary rear buffer cavity and a secondary rear buffer cavity, wherein the primary rear buffer cavity extends along the rear bottom edge of the sac bag and is communicated with the front buffer cavity, and the secondary rear buffer cavity is located on the opposite side of the primary rear buffer cavity and is communicated with the primary rear buffer cavity through a secondary airway formed between the non-inflatable portion and the edge of the rear buffer cavity.

[0012] Further, the front protection cavity is communicated with the gas passing cavity through the front airway, and the rear protection cavity is communicated with the gas passing cavity through the rear airway;

[0013] The expansion size of the primary airway is smaller than the expansion sizes of the front airway and the rear airway, so that the gas entering the bag first fills the front protection cavity and the rear protection cavity.

[0014] Furthermore, the pouch further comprises:

[0015] A first suture portion, the first suture portion extending from the front bottom end suture of the bladder bag toward the gas passage cavity, and a transverse front buffer cavity is formed between the first suture portion and the bottom end suture of the bladder bag;

[0016] A second suture portion, the second suture portion extends upward from the rear bottom suture of the bag to the gas passage cavity, and then extends to the front end of the bag and the bottom end of the bag in sequence, the rear buffer cavity is formed between the second suture portion and the bottom suture of the bag, the primary airway is formed between the tail of the second suture portion and the tail of the first suture portion, and the non-inflatable portion is spaced from the head and / or tail of the second suture portion to form the secondary airway;

[0017] Among them, a longitudinal front buffer cavity is formed between the part of the tail of the second suture portion extending toward the bottom end of the pouch and the tail of the first suture portion, and the transverse front buffer cavity and the longitudinal front buffer cavity together constitute the front buffer cavity.

[0018] Furthermore, the middle portion of the bottom end of the sac is concave upward to form an inner concave portion, and the middle portion of the bottom end of the sac is extended from the inner concave portion to both sides to form an eight-shaped structure to reduce the volume of the front buffer cavity and the rear buffer cavity.

[0019] Furthermore, the suture portion of the annular suture forming the non-inflatable portion toward the middle of the bottom end of the bladder bag is arc-shaped, so that the primary rear buffer cavity is arc-shaped.

[0020] Furthermore, the middle portion of the first stitching portion protrudes toward the direction where the second stitching portion is located, so as to reduce the speed at which gas enters the front buffer cavity of the transverse portion.

[0021] Furthermore, the buffer area also includes:

[0022] A suture lock portion, which is located between the air inlet of the secondary rear buffer cavity and the first suture portion, and is arranged corresponding to the middle part of the first suture portion, and is used to divert the gas entering from the primary airway to the secondary rear buffer cavity and the transverse front buffer cavity.

[0023] Furthermore, the rear protection cavity includes at least one longitudinally arranged support cavity, which is adjacent to the rear buffer cavity, and the support cavity is used to form a strong support with the door guard plate after being inflated and expanded to reduce the pitch movement of the occupant's head in a small offset collision event.

[0024] Furthermore, the pouch further comprises:

[0025] The front end buffer cavity is arranged at the front end of the bag and is connected with the front protection cavity through the front end airway.

[0026] Furthermore, when an occupant in the vehicle sits at a large tilt angle and the bag is inflated and deployed, the primary rear buffer cavity corresponds to the occupant's head.

[0027] Compared with the prior art, the at least one technical solution adopted in the embodiment of the present invention can achieve the following beneficial effects:

[0028] A side air curtain of the present invention is achieved by setting a buffer area between a front protection cavity and a rear protection cavity, the buffer area includes a front buffer cavity and a rear buffer cavity, and then the longitudinal portion of the front buffer cavity is at least used to correspond to the B-pillar of the automobile, and the transverse portion at least extends over the backrest of the front seat of the automobile, and the rear buffer cavity is at least used to correspond to the seat-free area between the B-pillar of the automobile and the rear seat, so that the front protection cavity and the rear protection cavity are quickly filled by slow inflation through the buffer area, and after the front protection cavity and the rear protection cavity are filled and hit by the occupant, the gas can enter the multiple buffer cavities in the buffer area and maintain the gas in the front protection cavity and the rear protection cavity, thereby solving the problem that the existing side air curtain is difficult to quickly fill the protection cavity when dealing with a small-volume gas generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 The figure is a schematic structural diagram of a side air curtain according to an embodiment of the present invention.

[0031] 10. Bag; 11. Front protection cavity; 12. Rear protection cavity; 121. Support cavity; 122. Head protection cavity; 13. Buffer area; 131. Front buffer cavity; 1311. Transverse part front buffer cavity; 1312. Longitudinal part front buffer cavity; 132. Rear buffer cavity; 1321. Primary rear buffer cavity; 1322. Secondary rear buffer cavity; 133. Primary airway; 134. Secondary airway; 135. Non-inflatable part; 14. First suture part; 15. Second suture part; 16. Inner recess; 17. Suture lock part; 18. Front end buffer cavity; 19. Gas passage cavity. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0033] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0034] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0035] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the examples can be practiced without these specific details.

[0037] For some gas generators with low output, slow gas output or small volume, the traditional setting method of the protection chamber and buffer chamber of the multi-chamber air curtain makes it difficult to quickly fill the protection chamber to protect the occupants. In the prior art, a non-inflated area and a small inflation channel between the cavities are usually formed on the multi-chamber side air curtain to quickly fill the protection chamber to protect the occupants. However, due to the lack of coordination between the position setting of the small inflation channel and the non-inflated area, the protection chamber cannot be quickly filled when dealing with gas generators with low output, slow gas output or small volume. Therefore, a new type of side air curtain is needed to deal with gas generators with low output, slow gas output or small volume.

[0038] Based on this, this specification embodiment proposes a processing solution: Figure 1As shown, a side air curtain of the present invention forms a buffer area 13 between a front protection cavity 11 and a rear protection cavity 12, and forms a gas passage cavity 19 between the buffer area 13 and the top of the bag 10, the front protection cavity 11 and the rear protection cavity 12 correspond to the two ends of the gas passage cavity 19 respectively, and the air passage size of the buffer area 13 is set to be smaller than the front air passage of the front protection cavity 11 and the rear air passage of the rear protection cavity 12, the longitudinal part of the front buffer cavity 131 is at least used to correspond to the B-pillar of the car, and the transverse part at least extends over the backrest of the front seat of the car; the rear buffer cavity 132 At least it is used to correspond to the seat-free area between the B-pillar and the rear seats of the car, so that the gas can quickly rush into the front protection cavity 11 and the rear protection cavity 12, so that the front protection cavity 11 and the rear protection cavity 12 can be filled in time to protect the occupants; then, a buffer space is realized after the front protection cavity 11 and the rear protection cavity 12 are hit by a plurality of buffer cavities in the buffer area 13, and after the occupants hit the front protection cavity 11 or the rear protection cavity 12, the front protection cavity 11 and the rear protection cavity 12 can be concave while maintaining a certain pressure to avoid secondary injuries to the occupants.

[0039] The technical solutions provided by various embodiments of the present application are described below in conjunction with the accompanying drawings.

[0040] like Figure 1 As shown, a side air curtain of the present invention includes a bag 10, and the bag 10 includes a front protection cavity 11, a rear protection cavity 12 and a buffer area 13; the buffer area 13 is arranged between the front protection cavity 11 and the rear protection cavity 12, and a gas passage cavity 19 is formed between the buffer area 13 and the top edge of the bag 10, and the gas passage cavity 19 is connected to the front protection cavity 11, the rear protection cavity 12 and the buffer area 13 respectively.

[0041] When the side air curtain is installed on a car, the front protection cavity 11 is arranged corresponding to the front seats, and the rear protection cavity 12 is arranged corresponding to at least the rear seats.

[0042] In some of the embodiments, the front protection cavity 11 may be an oblique cavity, and is connected to the gas passage cavity 19 through the front airway; the rear protection cavity 12 may be an oblique cavity or a vertical cavity, and is connected to the gas passage cavity 19 through the rear airway.

[0043] The front protection cavity 11 is a cavity in the front end of the pouch 10 that mainly plays a protective role, and it may be one or more cavities.

[0044] For example, the front protection cavity 11 may be a large oblique cavity, or may be a plurality of longitudinal cavities arranged in parallel, or may be at least one large oblique / longitudinal cavity and a plurality of small cavities, etc.

[0045] The longitudinal cavity described in the present application is a substantially longitudinal cavity, which may have a small inclination angle, such as an inclination angle of 0 to 15°.

[0046] The rear protection cavity 12 is a cavity in the rear end of the pouch 10 that mainly plays a protective role, and it may be one or more cavities.

[0047] For example, the rear protection cavity 12 may be a large oblique cavity, or may be a plurality of longitudinal cavities formed in parallel, so as to reduce the pitching movement of the occupant's head in a collision event.

[0048] When the air guide bag is installed in the bag 10, the two air outlets of the air guide bag are respectively arranged corresponding to the front air duct and the rear air duct to directly transport the gas to the front protection cavity 11 and the rear protection cavity 12, so that the front protection cavity 11 and the rear protection cavity 12 are quickly filled.

[0049] The buffer region 13 is connected to the gas passage cavity 19 via the primary gas passage 133 , and the primary gas passage 133 can be connected to the gas passage cavity 19 so that the gas can directly enter the buffer region 13 .

[0050] Among them, since the first-level airway 133 is located below the gas passage chamber 19 and on both sides of the front protection chamber 11 and the rear protection chamber 12, after the gas is drained through the air guide bag, most of the gas flows to the front protection chamber 11 and the rear protection chamber 12, and a small part of the gas flows into the buffer area 13 through the first-level airway 133, so that the front protection chamber 11 and the rear protection chamber 12 are filled first.

[0051] Furthermore, the expansion size of the primary air passage 133 is smaller than the expansion sizes of the front air passage and the rear air passage, so that the gas first enters the front protection cavity 11 and the rear protection cavity 12 in large quantities.

[0052] The buffer area 13 is used to at least cover the B-pillar and the area without seats between the B-pillar and the rear seats.

[0053] Specifically, the buffer area 13 includes a front buffer chamber 131, a rear buffer chamber 132 and a non-inflatable portion 135. The front buffer chamber 131 is arranged close to the front protective chamber 11 and is inclined downward along the front end of the bag 10. The front buffer chamber 131 corresponds to at least the B-pillar; the rear buffer chamber 132 is located between the rear protective chamber 12 and the front buffer chamber 131, and a primary airway 133 is formed between the rear buffer chamber 132 and the front buffer chamber 131. The primary airway 133 is used to allow gas to enter the front buffer chamber 131 and the rear buffer chamber 132. The rear buffer chamber 132 is used to correspond to the non-seat area between the B-pillar and the rear seat; the non-inflatable portion 135 is arranged in the rear buffer chamber 132 and the rear buffer chamber 132 is used to connect the rear seat to the non-seat area; The buffer chamber 132 is divided into a primary rear buffer chamber 1321 and a secondary rear buffer chamber 1322. The primary rear buffer chamber 1321 extends along the rear bottom edge of the pouch 10 and is connected to the front buffer chamber 131. The secondary rear buffer chamber 1322 is located on the opposite side of the primary rear buffer chamber 1321 and is connected to the primary rear buffer chamber 1321 through a secondary airway 134 formed between the non-inflatable portion 135 and the edge of the rear buffer chamber 132. After the gas enters the primary rear buffer chamber 1321 from the primary airway 133, it enters the secondary rear buffer chamber 1322 through the secondary airway 134.

[0054] The front buffer cavity 131 and the front protection cavity 11 are divided by a suture. For example, one side of the suture forms the front buffer cavity 131 , and the other side forms the front protection cavity 11 .

[0055] The front buffer cavity 131 as a whole corresponds to the B-pillar, the safety belt, and the seat side airbag, so that when the front buffer cavity 131 is deployed, the safety belt is not stuck and the deployment of the seat side airbag is not affected.

[0056] Among them, the front buffer cavity 131 can be an L-shaped structure as a whole, its longitudinal part roughly corresponds to the front seat back / B-pillar, and its transverse part extends from the B-pillar to the front end of the car, and the seat side airbag is arranged accordingly, so as to ensure that the front buffer cavity 131 is filled with gas, so as to facilitate the seat airbag to deploy first to protect the shoulders and chest of the occupants.

[0057] The front buffer cavity 131 is connected to the gas passage cavity 19 through the primary air channel 133 to obtain gas and expand.

[0058] Among them, the inflation diameter of the first-level airway 133 is 35mm, and the 2d flat diameter is 50mm.

[0059] Among them, the gas source of the front buffer chamber 131 can be the gas initially released by the gas generator, or the gas refluxed from the front protection chamber 11 and the rear protection chamber 12. The front buffer chamber 131 is mainly used to obtain a small amount of gas through the first-level air duct 133, so that the gas released by the gas generator first enters the front protection chamber 11 and the rear protection chamber 12, and when the front protection chamber 11 and the rear protection chamber 12 are hit by an occupant, the gas refluxed from the front protection chamber 11 and the rear protection chamber 12 is received, so that the front protection chamber 11 and the rear protection chamber 12 are concave when hit by an occupant, so as to cushion the occupant.

[0060] Among them, the rear buffer cavity 132 and the rear protective cavity 12 are divided by stitches. The rear buffer cavity 132 is mainly set corresponding to the seat-free area between the rear seats and the front seats, and is mainly used to occupy the use space of the bag 10, so that the volume of the rear protective cavity 12 is appropriately reduced for rapid filling.

[0061] The rear buffer chamber 132 obtains gas through the primary gas passage 133 , such as obtaining gas initially released by the gas generator or obtaining gas refluxed in the front buffer chamber 131 and the rear buffer chamber 132 .

[0062] Among them, the rear buffer chamber 132 is mainly used to obtain the gas refluxed in the front protection chamber 11 and the rear protection chamber 12 after the front protection chamber 11 and the rear protection chamber 12 are filled and hit by the occupant, so that the front protection chamber 11 and the rear protection chamber 12 become concave when hit by the occupant to cushion the occupant, and at the same time, receive the occupant's head when the occupant's head slides downward to protect the occupant's head.

[0063] Among them, the non-inflatable part 135 is used to divide the rear buffer chamber 132 into a primary rear buffer chamber 1321 and a secondary rear buffer chamber 1322, and is also used to limit the amount of gas entering to ensure the amount of gas entering the front protection chamber 11 and the rear protection chamber 12, so that the front protection chamber 11 and the rear protection chamber 12 are always in a bulging state.

[0064] Among them, the first-level rear buffer cavity 1321 is used to protect the head of the rear passenger when the head of the rear passenger slides downward from the rear protection cavity 12, thereby preventing the head of the passenger from hitting the door panel.

[0065] Among them, the secondary rear buffer chamber 1322 is used to play a buffering role. For example, when the primary rear buffer chamber 1321, the front protection chamber 11 or the rear protection chamber 12 is impacted, gas enters the secondary rear buffer chamber 1322, so that the primary rear buffer chamber 1321, the front protection chamber 11 or the rear protection chamber 12 can be concave and buffered when impacted by the occupant, thereby avoiding secondary injury to the occupant.

[0066] The non-inflatable portion 135 may be formed by surrounding an annular suture.

[0067] The secondary air passage 134 formed by the non-inflatable portion 135 and the edge of the rear buffer cavity 132 substantially refers to the air passage formed between the annular suture forming the non-inflatable portion 135 and the suture forming the rear buffer cavity 132 .

[0068] Among them, the inflation diameter of the primary airway 133 is 35 mm, the inflation diameter of the secondary airway 134 is 20-30 mm, the 2d flatness of the primary airway 133 is 50 mm, and the inflation diameter of the secondary airway 134 is 40-45 mm.

[0069] Among them, when there are two secondary air channels 134, the inflation diameter of the secondary air channel close to the front buffer cavity is 20mm, and the 2d flat diameter is 40; the inflation diameter of the secondary air channel far from the front buffer cavity is 30, and the 2d flat diameter is 45mm.

[0070] Specifically, when the side air curtain and the gas generator are assembled and installed on the automobile, if a collision occurs and the gas generator is ignited, since the expansion size of the first-level air duct 133 is smaller than the front air duct and the rear air duct, a large amount of gas quickly enters the front protection cavity 11 and the rear protection cavity 12 to fill the front protection cavity 11 and the rear protection cavity 12, and a small amount of gas enters the buffer area 13. After the front protection cavity 11 and the rear protection cavity 12 are filled, if the front protection cavity 11 and the rear protection cavity 12 are hit by an occupant, the gas in the front protection cavity 11 and the rear protection cavity 12 flows back to the gas passing cavity 19 and enters the front buffer cavity 131 and the rear buffer cavity 132 respectively through the first-level air duct 133 to protect the occupant.

[0071] Furthermore, after the gas enters the primary rear buffer chamber 1321 of the rear buffer chamber 132 and fills the primary rear buffer chamber 1321, since the size of the secondary airway 134 is also small, the speed at which the gas enters the secondary rear buffer chamber 1322 from the primary rear buffer chamber 1321 is slow, so that the front protection chamber 11 and the rear protection chamber 12 can still maintain sufficient air pressure after initial buffering and slowly concave inward to achieve continuous protection of the occupants.

[0072] The side air curtain of the present invention allows a large amount of gas released by the gas generator to first enter the front protection cavity 11 and the rear protection cavity 12, so that the front buffer cavity 131 is deployed later, thereby avoiding the front buffer cavity 131 from jamming the seat belt. In addition, since the front buffer cavity 131 is inflated slowly and its lateral part is arranged corresponding to the seat airbag, the deployment of the seat airbag is also facilitated.

[0073] A specific implementation of forming the buffer region 13 is given below:

[0074] The pouch 10 further includes a first suture portion 14 and a second suture portion 15. The first suture portion 14 extends from the front bottom suture of the pouch 10 to the gas passage cavity 19, and a transverse front buffer cavity 1311 is formed between the first suture portion 14 and the bottom suture of the pouch 10; the second suture portion 15 extends upward from the rear bottom suture of the pouch 10 to the gas passage cavity 19, and then extends to the front end of the pouch 10 and the bottom end of the pouch 10 in sequence, and a rear buffer cavity 132 is formed between the second suture portion 15 and the bottom suture of the pouch 10, and the second suture portion 15 A primary airway 133 is formed between the tail of the first suture portion 14, and the non-inflatable portion 135 is spaced from the head and / or tail of the second suture portion 15 to form a secondary airway 134; wherein, a longitudinal front buffer cavity 1312 is formed between the portion of the tail of the second suture portion 15 extending toward the bottom end of the bag 10 and the tail of the first suture portion 14, and the transverse front buffer cavity 1311 and the longitudinal front buffer cavity 1312 together constitute the front buffer cavity 131.

[0075] The first suture portion 14 is used to divide the pouch 10 to form a front buffer cavity 131 and a front protection cavity 11 on the pouch 10 .

[0076] For example, the first suture portion 14 of the bag 10 away from the rear end of the bag 10 is used to form the front protective cavity 11, and the first suture portion 14 of the bag 10 close to the rear end of the bag 10 cooperates with the bottom end suture of the bag 10 to form a lateral front buffer cavity 1311.

[0077] Among them, the transverse part front buffer cavity 1311 can be the transverse part of the front buffer cavity 131, and when the side air curtain is installed on the car and unfolded, the transverse part front buffer cavity 1311 is set corresponding to the seat side airbag to facilitate the unfolding of the seat side airbag in the event of a collision.

[0078] Among them, the head of the first suture portion 14 is the part of the first suture portion 14 extending from the front bottom end suture of the bag 10. After the head of the first suture portion 14 extends upward or obliquely upward from the front bottom end suture of the bag 10, it extends toward the rear end direction of the bag 10 and maintains a sufficient distance from the front bottom end suture of the bag 10, so that a transverse partial front buffer cavity 1311 is formed between the head of the first suture portion 14 and the front bottom end suture of the bag 10; after the first suture portion 14 extends a sufficient length toward the rear end direction of the bag 10, it extends toward the direction of the gas passage cavity 19 to form the middle part of the first suture portion 14, and finally extends to the second suture portion 15 to form the tail of the first suture portion 14.

[0079] Among them, the head of the second suture portion 15 is the part of the second suture extending from the rear bottom end suture of the bag 10 to the gas passage cavity 19, the middle part of the second suture portion 15 is the part of the second suture portion 15 extending to the front end of the bag 10, and the tail part of the second suture portion 15 is the part extending to the bottom end of the bag 10.

[0080] The size of the primary airway 133 is determined by the minimum distance between the tail of the first suture portion 14 and the tail of the second suture portion 15 .

[0081] The size of the rear buffer cavity 132 is determined by the length of the second suture portion 15 extending toward the gas passage cavity 19 and the width extending toward the front end of the bladder bag 10 .

[0082] Preferably, when the air guide bag is installed in the bladder 10, the head of the second suture portion 15 extends to abut against the air guide bag, and the middle portion of the second suture portion 15 extends at least to the air outlet of the air guide bag.

[0083] Among them, an arc-shaped transition is set between the head and the middle part of the second suture part 15, and an arc-shaped transition is also set between the middle and the tail of the second suture part 15, so as to form a downward arc between the middle and the tail of the second suture part 15 to facilitate the gas to flow to the primary airway 133 and the front protective cavity 11.

[0084] A secondary airway 134 is formed between the annular suture forming the non-inflatable portion 135 and the head and / or tail of the second suture portion 15 , and the size of the secondary airway 134 is determined by the minimum distance between the annular suture and the head or tail of the second suture portion 15 .

[0085] In some of the embodiments, the tail ends of the first suture portion 14 and the second suture portion 15 are both provided with lock stitches to prevent the tail ends of the first suture portion 14 and the second suture portion 15 from being torn.

[0086] In some of the embodiments, the tail ends of the first suture portion 14 and the second suture portion 15 are bent into an arc shape to reduce the stress of the tail ends of the first suture portion 14 and the second suture portion 15 .

[0087] In some of the embodiments, the second suture portion 15 is substantially in an inverted U-shaped structure, and a longitudinal portion at one end thereof is shorter than a longitudinal portion at the other end.

[0088] The shapes of the front buffer cavity 131 and the rear buffer cavity 132 are restricted by the first stitching portion 14 and the second stitching portion 15, so that the combined shape of the front buffer cavity 131 and the rear buffer cavity 132 can be trumpet-shaped as a whole, so that the front buffer cavity 131 and the rear buffer cavity 132 can form a thickened and buffering area 13 while avoiding the protection area (the protection area is mainly the area corresponding to the front seats and the area corresponding to the rear seats).

[0089] Furthermore, the middle portion of the bottom end of the bag 10 is concave upward to form an inner concave portion 16, and the middle portion of the bottom end of the bag 10 extends from the inner concave portion 16 to both sides to form an eight-shaped structure to reduce the volume of the front buffer cavity 131 and the rear buffer cavity 132, thereby reducing the gas required to fill the front buffer cavity 131 and the rear buffer cavity 132.

[0090] Among them, the middle part of the bottom end of the bag 10 is extended from the inner recess 16 to both sides to form an eight-shaped structure. Compared with setting the middle part of the bottom end of the bag 10 as a straight stitching line, the volume of the front buffer cavity 131 and the rear buffer cavity 132 is reduced, so that when dealing with a gas generator with less gas output, the front buffer cavity 131 and the rear buffer cavity 132 can be filled with sufficient gas after the gas generator outputs gas, such as being inflated to be slightly bulging.

[0091] Among them, extending the middle part of the bottom end of the bag 10 from the inner recess 16 to both sides to form an eight-shaped structure can also make the horizontal part of the front buffer cavity 131 extend obliquely upward, so that when the front buffer cavity 131 is filled in advance, the empty space below it can also reserve deployment space for the seat side airbag without affecting the deployment of the seat side airbag.

[0092] Furthermore, the suture portion of the annular suture forming the non-inflatable portion 135 toward the middle of the bottom end of the bladder bag 10 is arc-shaped, so that the primary buffer cavity is arc-shaped.

[0093] Among them, the middle part of the bottom end of the bag 10 is extended from the inner recess 16 to both sides to form an eight-shaped structure, and the stitches of the non-inflatable part 135 are quasi-circular stitches (the stitches forming the non-inflatable part 135 at least have an arc-shaped structure toward the middle part of the bottom end of the bag 10), which can also make the first-level rear buffer cavity 1321 of the rear buffer cavity 132 form an arc-shaped cavity, so that when the first-level rear buffer cavity 1321 is full or nearly full, it can better accommodate the occupant's head from sliding down and prevent the occupant's head from continuing to slide in the front and rear directions.

[0094] Furthermore, the extension trend of the head of the first stitching portion 14 is similar to the extension trend of the corresponding stitching at the middle of the bottom end of the bag 10, so that the front buffer cavity 1311 of the transverse portion forms a roughly long strip structure, so as to completely avoid the seat side airbag.

[0095] Furthermore, the middle portion of the first stitch portion 14 protrudes in the direction of the second stitch portion 15 to reduce the speed at which gas enters the front buffer cavity 1311 of the lateral portion.

[0096] Among them, by protruding the middle part of the first stitching part 14 toward the direction where the second stitching part 15 is located, when the gas entering from the first-level air inlet flows into the front buffer chamber 131, excessive gas flowing into the front buffer chamber 131 and causing the front buffer chamber 131 to be filled is avoided, and there is less gas in the first-level rear buffer chamber 1321, and a larger cavity space can also be reserved for the front protective chamber 11.

[0097] Furthermore, the buffer area 13 also includes a suture lock portion 17, which is located between the air inlet of the secondary rear buffer cavity 1322 and the first suture portion 14, and is arranged corresponding to the middle part of the first suture portion 14, for diverting the gas entering from the primary airway 133 to the rear buffer cavity 132 and the lateral front buffer cavity 1311.

[0098] The stitch lock portion 17 is used to reduce the thickness of the adjacent portions of the front buffer cavity 131 and the rear buffer cavity 132 to prevent them from being stuck by the seat and unable to be fully deployed, and is also used to divert the gas.

[0099] Specifically, after the gas enters from the primary airway 133, the gas is simultaneously diverted by the protrusion formed in the middle of the first suture portion 14 and the suture lock portion 17, which can adjust the rate and amount of gas entering the front buffer cavity 1311 of the lateral portion and the primary rear buffer cavity 1321 to avoid uneven gas distribution.

[0100] Preferably, the stitch lock portion 17 is roughly horizontally corresponding to the protrusion formed in the middle of the first stitch portion 14 , and the stitch lock portion 17 is roughly vertically corresponding to the inner recess 16 formed at the bottom end of the pouch 10 .

[0101] In some embodiments, the rear protection cavity 12 includes at least a longitudinally arranged support cavity 121 and a plurality of head protection cavities 122. The support cavity 121 is adjacent to the rear buffer cavity 132 of the buffer area 13, and the support cavity 121 is used to form a strong support with the door guard plate after being inflated and deployed to reduce the pitching movement of the occupant's head in a small offset collision event; the plurality of head protection cavities 122 are sequentially arranged on the side of the support cavity 121 away from the rear buffer cavity, and are used to receive the occupant's head in a side collision to protect the occupant's head.

[0102] More specifically, in a side collision, the occupant's head collides laterally toward the vehicle window. At this time, after the side airbag is deployed, the head protection cavity 122 can receive the occupant's head to protect the occupant; in a small offset collision, the occupant's head tilts forward toward the vehicle window. At this time, the support cavity 121 can receive the occupant's head to protect the occupant's head.

[0103] like Figure 1As shown, area A in the figure is the approximate area for receiving the occupant's head during a side collision, and the support cavity 121 is used to receive the occupant's head during a small offset collision.

[0104] Furthermore, a front end buffer chamber 18 is provided in the front protection chamber 11 . The front end buffer chamber 18 is provided at the front end of the bag 10 and is connected to the front protection chamber 11 through a front end airway. The front end buffer chamber 18 is used to buffer the front protection chamber 11 .

[0105] Among them, the inflation diameter of the airway at the front end is 30mm, and the 2d flat length is 45mm.

[0106] Among them, the front end airway is a small airway, so when the front protection cavity 11 is filled, the front end buffer cavity 18 is in an unfilled state. Therefore, when the front protection cavity 11 is hit by an occupant, the gas in the front protection cavity 11 can enter the front end buffer cavity 18 to play a buffering role, thereby avoiding excessive pressure in the front protection cavity 11 to cause harm to the occupant.

[0107] In some of the embodiments, when an occupant in a vehicle sits at a large tilt angle and the bag 10 is inflated and deployed, the primary rear buffer chamber 1321 corresponds to the occupant's head to protect the occupant's head when the occupant sits at a large tilt angle.

[0108] The combined design of multiple small airways and non-inflated areas of the present invention allows the buffer area 13 to be reduced in thickness while maximizing its coverage, thereby allowing the protection cavity to inflate faster and be filled with air in time to support the occupant's head. The setting of the small airways limits the simultaneous filling of gas into the buffer cavity, and the buffer cavity can also store squeezed gas after a dynamic collision of the occupant.

[0109] In this specification, the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the product embodiment described later, since it corresponds to the method, the description is relatively simple, and the relevant parts can be referred to the partial description of the system embodiment.

[0110] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A side air curtain, comprising a bag, the bag comprising a front protection chamber and a rear protection chamber, characterized in that: It also includes a buffer area, which is arranged between the front protection cavity and the rear protection cavity, and a gas passage cavity is formed between the buffer area and the top edge of the pouch, and the gas passage cavity is connected to the front protection cavity, the rear protection cavity and the buffer area respectively; The buffer area includes: A front buffer chamber, the front buffer chamber is arranged close to the front protection chamber and has an L-shaped structure, the longitudinal portion of the front buffer chamber is at least used to correspond to the B-pillar of the automobile, and the transverse portion at least extends over the backrest of the front seat of the automobile; A rear buffer chamber, the rear buffer chamber is located between the rear protection chamber and the front buffer chamber, and a primary air passage is formed between the rear buffer chamber and the front buffer chamber, the primary air passage is used to allow gas to enter the front buffer chamber and the rear buffer chamber, and the rear buffer chamber is at least used to correspond to the seat-free area between the B-pillar and the rear seats of the automobile; A non-inflatable portion, wherein the non-inflatable portion is disposed in the rear buffer cavity and divides the rear buffer cavity into a primary rear buffer cavity and a secondary rear buffer cavity, wherein the primary rear buffer cavity extends along the rear bottom edge of the sac bag and is communicated with the front buffer cavity, and the secondary rear buffer cavity is located on the opposite side of the primary rear buffer cavity and is communicated with the primary rear buffer cavity through a secondary airway formed between the non-inflatable portion and the edge of the rear buffer cavity.

2. The side curtain airbag according to claim 1, characterized in that: The front protection cavity is in communication with the gas passage cavity through a front airway, and the rear protection cavity is in communication with the gas passage cavity through a rear airway; The expansion size of the primary airway is smaller than the expansion sizes of the front airway and the rear airway, so that the gas entering the bag first fills the front protection cavity and the rear protection cavity.

3. The side curtain airbag according to claim 2, characterized in that: The pouch further comprises: A first suture portion, the first suture portion extending from the front bottom end suture of the bladder bag toward the gas passage cavity, and a transverse front buffer cavity is formed between the first suture portion and the bottom end suture of the bladder bag; A second suture portion, the second suture portion extends upward from the rear bottom suture of the bag to the gas passage cavity, and then extends to the front end of the bag and the bottom end of the bag in sequence, the rear buffer cavity is formed between the second suture portion and the bottom suture of the bag, the primary airway is formed between the tail of the second suture portion and the tail of the first suture portion, and the non-inflatable portion is spaced from the head and / or tail of the second suture portion to form the secondary airway; Among them, a longitudinal front buffer cavity is formed between the part of the tail of the second suture portion extending toward the bottom end of the pouch and the tail of the first suture portion, and the transverse front buffer cavity and the longitudinal front buffer cavity together constitute the front buffer cavity.

4. The side curtain airbag according to claim 3, characterized in that: The middle part of the bottom end of the sac is concave upward to form an inner concave portion, and the middle part of the bottom end of the sac is extended from the inner concave portion to both sides to form an eight-shaped structure to reduce the volume of the front buffer cavity and the rear buffer cavity.

5. The side curtain airbag according to claim 4, characterized in that: The suture portion of the annular suture forming the non-inflatable portion toward the middle of the bottom end of the bladder bag is arc-shaped, so that the primary rear buffer cavity is arc-shaped.

6. The side curtain airbag according to claim 5, characterized in that: The middle portion of the first stitching portion protrudes toward the direction where the second stitching portion is located, so as to reduce the speed at which gas enters the front buffer cavity of the transverse portion.

7. The side curtain airbag according to claim 6, characterized in that: The buffer area also includes: A suture lock portion, which is located between the air inlet of the secondary rear buffer cavity and the first suture portion, and is arranged corresponding to the middle part of the first suture portion, and is used to divert the gas entering from the primary airway to the rear buffer cavity and the transverse front buffer cavity.

8. The side curtain airbag according to claim 1, characterized in that: The rear protection cavity includes at least one longitudinally arranged support cavity, which is adjacent to the rear buffer cavity and is used to form a strong support with the door guard plate after being inflated and expanded to reduce the pitch movement of the occupant's head in a small offset collision event.

9. The side curtain airbag according to claim 1, characterized in that: The pouch further comprises: The front end buffer cavity is arranged at the front end of the bag and is connected with the front protection cavity through the front end airway.

10. The side curtain airbag according to claim 1, characterized in that: When an occupant in the vehicle sits at a large tilt angle and the bag is inflated and deployed, the primary rear buffer chamber corresponds to the occupant's head.

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