A side curtain airbag

Abstract

The application discloses a side curtain airbag, which comprises a bag, the bag comprising a front protection cavity, a rear protection cavity and a buffer area, the buffer area being arranged between the front protection cavity and the rear protection cavity, and a gas passing cavity being formed between the buffer area and a top edge of the bag, the gas passing cavity being communicated with the front protection cavity, the rear protection cavity and the buffer area respectively, the buffer area comprising a front buffer cavity and a rear buffer cavity, a longitudinal part of the front buffer cavity being arranged at least corresponding to a B column of a car, and a transverse part of the front buffer cavity extending at least over a backrest of a front seat of the car; the rear buffer cavity being arranged at least corresponding to a seatless area between the B column of the car and a rear seat of the car. The side curtain airbag can make gas enter the front protection cavity and the rear protection cavity first, so that the front protection cavity and the rear protection cavity are filled, and the problem that the existing side curtain airbag is difficult to make the protection cavity be filled quickly when a small gas generator is used is solved by increasing the area of the buffer area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of airbags, in particular to a side curtain airbag. BACKGROUND

[0002] The side curtain airbag generally comprises a protective cavity for protection, a buffer cavity for buffering, and a non-inflating area, so that the protective cavity can be quickly filled when the inflator is ignited, and the protective cavity is quickly deployed in a collision event to protect the occupant.

[0003] In the prior art, a small inflating passage is usually arranged between the buffer cavity and the protective cavity, or a non-inflating area is formed between the protective cavities, so that the gas flow is preferentially directed to the protective cavity. However, in the conventional side curtain airbag, a certain area is usually arranged with either a non-inflating area or a small inflating passage, so when a small volume inflator is used, the small volume inflator has less gas, and the arrangement of the non-inflating area and the small inflating passage cannot effectively guide the gas flow to the protective cavity, which makes it difficult for the protective cavity to be quickly filled, resulting in a small coverage area of the protective cavity or a small thickness of the protective cavity, thereby making it difficult to effectively protect the occupant.

[0004] At present, there is no effective solution to the problem that the existing side curtain airbag is difficult to quickly fill the protective cavity when a small volume inflator is used. SUMMARY

[0005] Therefore, the embodiments of the present application provide a side curtain airbag to at least solve the problem that the existing side curtain airbag is difficult to quickly fill the protective cavity when a small volume inflator is used.

[0006] The embodiments of the present application provide the following technical solutions:

[0007] The embodiments of the present application provide a side curtain airbag, comprising a bag, the bag comprising a front protective cavity and a rear protective cavity, further comprising a buffer area, the buffer area being arranged between the front protective cavity and the rear protective cavity, and a gas passing cavity being formed between the buffer area and a top edge of the bag, the gas passing cavity being in communication with the front protective cavity, the rear protective cavity and the buffer area respectively;

[0008] The buffer area comprises:

[0009] The front buffer cavity is arranged close to the front protective cavity and has an L-shaped structure, the longitudinal part of the front buffer cavity being arranged at least corresponding to the B pillar, and the transverse part extending at least over the backrest of the front row seat of the vehicle;

[0010] a rear buffer cavity located between the rear protection cavity and the front buffer cavity, and forming a primary air passage between the rear buffer cavity and the front buffer cavity, the primary air passage being used for gas to enter the front buffer cavity and the rear buffer cavity, the rear buffer cavity being arranged at least corresponding to the seatless area between the B pillar and the rear seat of the car;

[0011] a non-inflatable part arranged in the rear buffer cavity and separating the rear buffer cavity into a primary rear buffer cavity and a secondary rear buffer cavity, the primary rear buffer cavity extending along the rear bottom edge of the bag and being in communication with the front buffer cavity, and the secondary rear buffer cavity being located on the opposite side of the primary rear buffer cavity and being in communication with the primary rear buffer cavity through a secondary air passage formed between the non-inflatable part and the rear buffer cavity edge.

[0012] Further, the front protection cavity is in communication with the gas passing cavity through a front air passage, and the rear protection cavity is in communication with the gas passing cavity through a rear air passage;

[0013] wherein the inflation size of the primary air passage is smaller than the inflation size of the front air passage and the rear air passage, so that the gas entering the bag first fills the front protection cavity and the rear protection cavity.

[0014] Further, the bag further comprises:

[0015] a first stitching part extending from the front bottom edge stitching of the bag to the gas passing cavity, and forming a transverse part front buffer cavity between the first stitching part and the bottom edge stitching of the bag;

[0016] a second stitching part extending from the rear bottom edge stitching of the bag upward to the rear of the gas passing cavity, and then extending to the front end of the bag and the bottom edge of the bag, the second stitching part forming the rear buffer cavity between the second stitching part and the bottom edge stitching of the bag, the tail of the second stitching part and the tail of the first stitching part forming the primary air passage, and the non-inflatable part being arranged in the space between the head and / or tail of the second stitching part to form the secondary air passage;

[0017] wherein the part of the tail of the second stitching part extending to the bottom edge of the bag and the tail of the first stitching part form a longitudinal part front buffer cavity, and the transverse part front buffer cavity and the longitudinal part front buffer cavity jointly constitute the front buffer cavity.

[0018] Further, the middle part of the bottom edge of the bag is concave upward to form a concave part, and the middle part of the bottom edge of the bag extends to both sides from the concave part to form a spade-shaped structure, so as to reduce the volume of the front buffer cavity and the rear buffer cavity.

[0019] Further, the suture part of the annular suture forming the non-inflating part is arc-shaped towards the middle part of the bottom end of the bag, so that the primary rear buffer cavity is arc-shaped.

[0020] Further, the middle part of the first suture part protrudes towards the direction of the second suture part, so as to reduce the inflating speed of the gas into the transverse part front buffer cavity.

[0021] Further, the buffer area further comprises:

[0022] A suture lock part is arranged between the gas inlet of the secondary rear buffer cavity and the first suture part, and corresponds to the middle part of the first suture part, so as to shunt the gas from the primary air passage to the secondary rear buffer cavity and the transverse part front buffer cavity.

[0023] Further, the rear protection cavity comprises at least a longitudinal support cavity, which is adjacent to the rear buffer cavity, and which is used to form a strong support between the door apron after the inflating and unfolding, so as to reduce the pitching movement of the head of the occupant in a small offset collision event.

[0024] Further, the bag further comprises:

[0025] A front end part buffer cavity is arranged at the front end of the bag, and is communicated with the front protection cavity through a front end part air passage.

[0026] Further, when the occupant in the vehicle is seated at a large inclination angle and the bag is inflated and unfolded, the primary rear buffer cavity corresponds to the head of the occupant.

[0027] Compared with the prior art, the above-mentioned at least one technical scheme adopted by the embodiment of the present application can achieve at least the following beneficial effects:

[0028] The side air curtain of the present application sets a buffer area between the front protection cavity and the rear protection cavity, the buffer area comprises a front buffer cavity and a rear buffer cavity, then the longitudinal part of the front buffer cavity is arranged at least corresponding to the B column of the automobile, the transverse part extends at least over the backrest of the front seat of the automobile, and the rear buffer cavity is arranged at least corresponding to the seatless area between the B column of the automobile and the back seat, so that the buffer area is inflated slowly to make the front protection cavity and the rear protection cavity be filled quickly, and after the front protection cavity and the rear protection cavity are filled and are hit by the occupant, the gas can enter the multiple buffer cavities in the buffer area, and the gas in the front protection cavity and the rear protection cavity is maintained, so that the problem that the prior art side air curtain is difficult to make the protection cavity be filled quickly when dealing with a small volume gas generator is solved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and do not include all the embodiments. The present application can be implemented or applied through other different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] Figure 1 A structure diagram of a side curtain according to an embodiment of the present application.

[0031] 10, pocket; 11, front protection cavity; 12, rear protection cavity; 121, support cavity; 122, head protection cavity; 13, buffer area; 131, front buffer cavity; 1311, transverse portion front buffer cavity; 1312, longitudinal portion 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 portion; 14, first suture portion; 15, second suture portion; 16, concave portion; 17, suture lock portion; 18, front end portion buffer cavity; 19, gas passage cavity. DETAILED DESCRIPTION

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

[0033] The embodiments of the present application will be described in detail below with reference to the drawings.

[0034] It is to be understood that the embodiments described hereinbelow within the scope of the appended claims. It will be apparent to one of ordinary skill in the art that aspects described herein can be implemented in a wide variety of forms, and that any specific structure and / or function described herein is merely illustrative. An aspect described herein can be implemented alone or in combination with any other aspect(s). Two or more aspects described herein can be combined in a variety of ways. For example, an apparatus can be implemented or a method can be practiced using any number of the aspects described herein. In addition, each of the

[0035] It is also to be understood that the diagrams provided in the following embodiments are only schematic and that the shapes, relative sizes, and proportions of parts shown in the diagrams are not intended to portray the actual shape, relative sizes, and proportions of the parts shown in the diagrams. The diagrams are provided merely for the purpose of illustration and explanation and can show detailed or generalized functional block diagrams.

[0036] Furthermore, in the following description, numerous specific details are set forth in order to provide a thorough understanding of the examples. However, it will be apparent to one of ordinary skill in the art that the examples can be practiced without these specific details.

[0037] For some small output, slow or small volume of gas generator, the traditional multi-cavity air curtain protection cavity and buffer cavity setting method, it is difficult to make the protection cavity be filled quickly to protect the passengers. In the prior art, a non-inflatable area and a small inflatable passage between cavities are usually formed on the multi-cavity side air curtain to quickly fill the protection cavity to protect the passengers. However, due to the lack of cooperation between the position setting of the small inflatable passage and the non-inflatable area, the protection cavity cannot be quickly filled when dealing with small output, slow or small volume of gas generator. Therefore, a new type of side air curtain is needed to deal with small output, slow or small volume of gas generator.

[0038] Based on this, the embodiment of the present specification proposes a processing scheme: as Figure 1As shown, a side curtain airbag of the present invention comprises a buffer region 13 formed between a front protective cavity 11 and a rear protective cavity 12, and an air passage cavity 19 formed between the buffer region 13 and the top of the bladder 10. The front protective cavity 11 and the rear protective cavity 12 correspond to the two ends of the air passage cavity 19, and the air passage size of the buffer region 13 is set to be smaller than the front air passage of the front protective cavity 11 and the rear air passage of the rear protective cavity 12. The longitudinal portion of the front buffer cavity 131 is at least used to correspond to the B-pillar of the car, and the lateral portion extends at least beyond the back of the front seat of the car; the rear buffer cavity 132... It is designed to correspond to the seatless area between the B-pillar and the rear seats of a car, so that gas can be quickly rushed into the front protection chamber 11 and the rear protection chamber 12, so that the front protection chamber 11 and the rear protection chamber 12 can be filled in time to protect the occupants; then, through multiple buffer chambers in the buffer area 13, a buffer space is provided after the front protection chamber 11 and the rear protection chamber 12 are impacted. It can also cause the front protection chamber 11 and the rear protection chamber 12 to be concave under a certain pressure after the occupants are impacted, so as to avoid secondary injury to the occupants.

[0039] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

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

[0041] When the side curtain airbags are installed on the car, the front protection chamber 11 is set to correspond with the front seats, and the rear protection chamber 12 is set to correspond to at least the rear seats.

[0042] In some embodiments, the front protective cavity 11 can be an inclined cavity and it is connected to the gas passage cavity 19 through the front air passage; the rear protective cavity 12 can be an inclined cavity or a vertical cavity and it is connected to the gas passage cavity 19 through the rear air passage.

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

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

[0045] The longitudinal cavity is a general longitudinal cavity, which can have a small inclination angle, such as an inclination angle of 0-15°.

[0046] The rear protection cavity 12 is a cavity in the rear end of the bag 10, which mainly plays a protection role, and can be one or more cavities.

[0047] For example, the rear protection cavity 12 can be a large inclined cavity, or can be a plurality of longitudinal cavities arranged side by side 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 passage and the rear air passage, so as to directly deliver 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 rapidly filled.

[0049] The buffer area 13 is communicated with the gas passing cavity 19 through the first air passage 133, and the first air passage 133 can be communicated with the gas passing cavity 19, so that the gas can directly enter the buffer area 13.

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

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

[0052] The buffer area 13 is used to cover at least the B column and the seatless area between the B column and the rear seat.

[0053] Specifically, the buffer area 13 comprises a front buffer cavity 131, a rear buffer cavity 132 and a non-inflatable part 135. The front buffer cavity 131 is arranged close to the front protection cavity 11 and is inclined downward along the front end of the airbag 10, and the front buffer cavity 131 corresponds to at least the B-pillar; the rear buffer cavity 132 is located between the rear protection cavity 12 and the front buffer cavity 131, and a primary air passage 133 is formed between the front buffer cavity 131 and the rear buffer cavity 132, the primary air passage 133 is used for allowing gas to enter the front buffer cavity 131 and the rear buffer cavity 132, and the rear buffer cavity 132 is used for corresponding to at least the seatless area between the B-pillar and the rear seat; the non-inflatable part 135 is arranged in the rear buffer cavity 132 and divides the rear buffer cavity 132 into a primary rear buffer cavity 1321 and a secondary rear buffer cavity 1322, the primary rear buffer cavity 1321 extends along the rear bottom edge of the airbag 10 and communicates with the front buffer cavity 131, and the secondary rear buffer cavity 1322 is located on the opposite side of the primary rear buffer cavity 1321 and communicates with the primary rear buffer cavity 1321 through a secondary air passage 134 formed between the non-inflatable part 135 and the edge of the rear buffer cavity 132; wherein the gas enters the secondary rear buffer cavity 1322 through the secondary air passage 134 after entering the primary rear buffer cavity 1321 from the primary air passage 133.

[0054] The front buffer cavity 131 and the front protection cavity 11 are separated 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 corresponds to the B-pillar, the seat belt and the seat side airbag as a whole, so that the seat belt is not jammed and the deployment of the seat side airbag is not affected when the front buffer cavity 131 is deployed.

[0056] The front buffer cavity 131 can have an L-shaped structure, the longitudinal part of which corresponds to the front seat backrest / B-pillar, and the transverse part of which extends from the B-pillar to the front end of the vehicle and corresponds to the seat side airbag, so that the front buffer cavity 131 is fully inflated with gas, and the seat airbag is deployed first to protect the passenger's shoulder and chest.

[0057] The front buffer cavity 131 communicates with the gas passage 19 through the primary air passage 133 to obtain gas and deploy.

[0058] The inflation diameter of the primary air passage 133 is 35mm, and the 2d laying is 50mm.

[0059] The gas source of the front buffer cavity 131 can be the gas initially released by the gas generator, or the gas backflowing from the front protection cavity 11 and the rear protection cavity 12. The front buffer cavity 131 is mainly used to obtain a small amount of gas through the primary gas passage 133, so that the gas released by the gas generator first enters the front protection cavity 11 and the rear protection cavity 12, and receives the gas backflowing from the front protection cavity 11 and the rear protection cavity 12 when the front protection cavity 11 and the rear protection cavity 12 are impacted by the occupant, so that the front protection cavity 11 and the rear protection cavity 12 are concave when impacted by the occupant, thereby buffering the occupant.

[0060] The rear buffer cavity 132 and the rear protection cavity 12 are separated by a suture. The rear buffer cavity 132 is mainly arranged corresponding to the seatless area between the rear seat and the front seat, and is mainly used to occupy the use space of the bag 10, so that the volume of the rear protection cavity 12 is appropriately reduced to be quickly filled.

[0061] The rear buffer cavity 132 obtains gas through the primary gas passage 133, such as the gas initially released by the gas generator or the gas backflowing from the front buffer cavity 131 and the rear buffer cavity 132.

[0062] The rear buffer cavity 132 is mainly used to obtain the gas backflowing from the front protection cavity 11 and the rear protection cavity 12 after the front protection cavity 11 and the rear protection cavity 12 are filled and impacted by the occupant, so that the front protection cavity 11 and the rear protection cavity 12 are concave when impacted by the occupant, thereby buffering the occupant. When the head of the occupant slides downward, the head of the occupant is received to protect the head of the occupant.

[0063] The non-inflatable part 135 is used to divide the rear buffer cavity 132 into a primary rear buffer cavity 1321 and a secondary rear buffer cavity 1322, and is also used to limit the amount of gas entering, so as to ensure the amount of gas entering 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 always in a bulging state.

[0064] The primary rear buffer cavity 1321 is used to protect the head of the occupant when the head of the occupant slides downward from the rear protection cavity 12, so as to avoid the head of the occupant from bumping on the door panel.

[0065] The secondary rear buffer cavity 1322 is used for buffering, such as when the primary rear buffer cavity 1321, the front protection cavity 11 or the rear protection cavity 12 is impacted, the gas enters the secondary rear buffer cavity 1322, so that the primary rear buffer cavity 1321, the front protection cavity 11 or the rear protection cavity 12 can be concave when impacted by the occupant, thereby avoiding secondary injury to the occupant.

[0066] The non-inflatable part 135 can be formed in a ring shape by a suture.

[0067] The secondary air passage 134 formed between the non-inflatable part 135 and the edge of the rear buffer cavity 132 is substantially an air passage formed between the annular suture forming the non-inflatable part 135 and the suture forming the rear buffer cavity 132.

[0068] The inflated diameter of the primary air passage 133 is 35 mm, the inflated diameter of the secondary air passage 134 is 20-30 mm, the 2d lay of the primary air passage 133 is 50 mm, and the inflated diameter of the secondary air passage 134 is 40-45 mm.

[0069] When there are two secondary air passages 134, the inflated diameter of the secondary air passage close to the front buffer cavity is 20 mm, and the 2d lay diameter is 40 mm; the inflated diameter of the secondary air passage away from the front buffer cavity is 30 mm, and the 2d lay diameter is 45 mm.

[0070] Specifically, when the side air curtain is assembled with the gas generator and installed on the automobile, if a collision event occurs and the gas generator is detonated, due to the small inflation size of the primary air passage 133, a large amount of gas rapidly 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 the occupant, the gas in the front protection cavity 11 and the rear protection cavity 12 flows back to the gas passage cavity 19 and enters the front buffer cavity 131 and the rear buffer cavity 132 through the primary air passage 133, respectively, to protect the occupant.

[0071] Further, after the gas enters the primary rear buffer cavity 1321 of the rear buffer cavity 132 and fills the primary rear buffer cavity 1321, at this time, due to the small size of the secondary air passage 134, the gas enters the secondary rear buffer cavity 1322 from the primary rear buffer cavity 1321 at a slow speed, so that the front protection cavity 11 and the rear protection cavity 12 can still maintain sufficient air pressure after preliminary buffering and slowly recess, thereby achieving continuous protection of the occupant.

[0072] The side air curtain of the present application first enters the front protection cavity 11 and the rear protection cavity 12 with a large amount of gas released by the gas generator, so that the front buffer cavity 131 is deployed, thereby avoiding the front buffer cavity 131 from being stuck with the safety belt, and since the inflation speed of the front buffer cavity 131 is slow and the transverse part thereof is arranged corresponding to the seat airbag, the deployment of the seat airbag is also facilitated.

[0073] One specific embodiment of forming the buffer area 13 is given as follows:

[0074] The bag 10 further comprises a first sewing part 14 and a second sewing part 15. The first sewing part 14 extends from the front bottom end sewing line of the bag 10 to the gas passing cavity 19, and a transverse part front buffer cavity 1311 is formed between the first sewing part 14 and the bottom end sewing line of the bag 10; the second sewing part 15 extends from the rear bottom end sewing line of the bag 10 to the gas passing cavity 19, then to the front end of the bag 10 and the bottom end of the bag 10, a rear buffer cavity 132 is formed between the second sewing part 15 and the bottom end sewing line of the bag 10, a first level air passage 133 is formed between the tail of the second sewing part 15 and the tail of the first sewing part 14, and a non-inflatable part 135 is arranged between the head and / or tail of the second sewing part 15 to form a second level air passage 134; a longitudinal part front buffer cavity 1312 is formed between the tail of the second sewing part 15 extending to the bottom end of the bag 10 and the tail of the first sewing part 14, and the transverse part front buffer cavity 1311 and the longitudinal part front buffer cavity 1312 jointly form the front buffer cavity 131.

[0075] The first sewing part 14 is used to divide the bag 10 to form the front buffer cavity 131 and the front protection cavity 11 on the bag 10.

[0076] For example, the part of the first sewing part 14 away from the rear end of the bag 10 is used to form the front protection cavity 11, and the part of the first sewing part 14 close to the rear end of the bag 10 cooperates with the bottom end sewing line of the bag 10 to form the transverse part front buffer cavity 1311.

[0077] The transverse part front buffer cavity 1311 can be a 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 arranged corresponding to the seat side airbag to facilitate the unfolding of the seat side airbag in a collision event.

[0078] The head of the first sewing part 14 is the part of the first sewing part 14 extending from the front bottom end sewing line of the bag 10, the head of the first sewing part 14 extends upward or obliquely upward from the front bottom end sewing line of the bag 10, then extends to the rear end of the bag 10, and keeps a sufficient distance from the front bottom end sewing line of the bag 10, so that the head of the first sewing part 14 and the front bottom end sewing line of the bag 10 form the transverse part front buffer cavity 1311; the first sewing part 14 extends to the rear end of the bag 10 for a sufficient length, then extends to the gas passing cavity 19 to form the middle part of the first sewing part 14, and finally extends to the second sewing part 15 to form the tail of the first sewing part 14.

[0079] The head of the second stitching part 15 is the part of the second stitching extending out from the rear bottom end stitching of the bag 10 to the gas passing cavity 19, the middle of the second stitching part 15 is the part of the second stitching part 15 extending to the front end of the bag 10, and the tail of the second stitching part 15 is the part of the second stitching part 15 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 stitching part 14 and the tail of the second stitching part 15.

[0081] The size of the rear buffer cavity 132 is determined by the length of the second stitching part 15 extending to the gas passing cavity 19 and the width of the second stitching part 15 extending to the front end of the bag 10.

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

[0083] The head and the middle of the second stitching part 15 are arc-shaped transitioned, and the middle and the tail of the second stitching part 15 are also arc-shaped transitioned to form a downward arc between the middle and the tail of the second stitching part 15 to facilitate the gas flow to the primary airway 133 and the front protection cavity 11.

[0084] The annular stitching forming the non-inflatable part 135 forms a secondary airway 134 with the head and / or the tail of the second stitching part 15, and the size of the secondary airway 134 is determined by the minimum distance between the annular stitching and the head or the tail of the second stitching part 15.

[0085] In some embodiments, the tail end of the first stitching part 14 and the tail end of the second stitching part 15 are provided with lock stitches to avoid the tail of the first stitching part 14 and the tail of the second stitching part 15 being torn.

[0086] In some embodiments, the tail end of the first stitching part 14 and the tail end of the second stitching part 15 are curved into an arc shape to reduce the stress of the tail end of the first stitching part 14 and the tail end of the second stitching part 15.

[0087] In some embodiments, the second stitching part 15 is substantially in an inverted U-shaped structure, and one end of the second stitching part 15 is shorter than the other end in the longitudinal direction.

[0088] By limiting the shape of the front buffer cavity 131 and the rear buffer cavity 132 through the first stitching part 14 and the second stitching part 15, the combined shape of the front buffer cavity 131 and the rear buffer cavity 132 is in a horn shape as a whole, so that the front buffer cavity 131 and the rear buffer cavity 132 can form the thinning and buffering area 13 while avoiding the protection area (the protection area mainly corresponds to the front seat area and the rear seat area).

[0089] Further, the middle part of the bottom end of the bag 10 is concave upward to form a concave part 16, and the middle part of the bottom end of the bag 10 extends to both sides from the concave part 16 to form a flared structure, so as to reduce the volume of the front buffer cavity 131 and the rear buffer cavity 132, and reduce the gas needed to fill the front buffer cavity 131 and the rear buffer cavity 132.

[0090] In the above, the middle part of the bottom end of the bag 10 extends to both sides from the concave part 16 to form a flared structure, compared to the middle part of the bottom end of the bag 10 being provided in a straight line type seam, the volume of the front buffer cavity 131 and the rear buffer cavity 132 is reduced, so that when a gas generator with less gas output is encountered, the front buffer cavity 131 and the rear buffer cavity 132 can be filled with enough gas after the gas generator outputs gas, such as being inflated to slightly bulge.

[0091] In the above, the middle part of the bottom end of the bag 10 extends to both sides from the concave part 16 to form a flared structure, which 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 space below can also be reserved for the deployment of the seat side airbag, without affecting the deployment of the seat side airbag.

[0092] Further, the seam part of the annular seam forming the non-inflatable part 135 towards the middle part of the bottom end of the bag 10 is arc-shaped, so that the primary buffer cavity is arc-shaped.

[0093] In the above, the middle part of the bottom end of the bag 10 extends to both sides from the concave part 16 to form a flared structure, and the seam of the non-inflatable part 135 is a circular ring type seam (the seam forming the non-inflatable part 135 is at least arc-shaped towards the seam part of the middle part of the bottom end of the bag 10), which can also make the primary rear buffer cavity 1321 of the rear buffer cavity 132 form an arc-shaped cavity, so that when the primary rear buffer cavity 1321 is filled or close to being filled, it can better accommodate the downward sliding of the occupant's head, avoiding the occupant's head from continuing to slide in the front-rear direction.

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

[0095] Further, the middle part of the first seam part 14 protrudes towards the direction where the second seam part 15 is located, so as to reduce the rate of gas entering the transverse part front buffer cavity 1311.

[0096] Wherein, by protruding the middle part of the first sewing line part 14 towards the direction of the second sewing line part 15, when the gas entering from the primary air inlet flows into the front buffer cavity 131, the front buffer cavity 131 is prevented from being filled with excessive gas, and the gas in the primary rear buffer cavity 1321 is less, and at the same time, a larger cavity space is reserved for the front protection cavity 11.

[0097] Further, the buffer area 13 further comprises a sewing line lock part 17, which is located between the air inlet of the secondary rear buffer cavity 1322 and the first sewing line part 14, and is arranged corresponding to the middle part of the first sewing line part 14, for shunting the gas entering from the primary air duct 133 to the rear buffer cavity 132 and the transverse part front buffer cavity 1311.

[0098] Wherein, the sewing line lock part 17 is used to reduce the thickness of the adjacent part of the front buffer cavity 131 and the rear buffer cavity 132, so as to prevent it from being stuck by the seat and unable to fully deploy, and also for shunting the gas.

[0099] Specifically, after the gas enters from the primary air duct 133, the gas is shunted by the protrusion formed by the middle part of the first sewing line part 14 and the sewing line lock part 17, so as to adjust the rate and amount of gas entering the transverse part front buffer cavity 1311 and the primary rear buffer cavity 1321, to avoid uneven distribution of gas.

[0100] Preferably, the protrusion formed by the middle part of the first sewing line part 14 and the sewing line lock part 17 correspond to each other horizontally, and the sewing line lock part 17 and the inner recess 16 formed by the bottom end of the bag 10 correspond to each other vertically.

[0101] In some embodiments, the rear protection cavity 12 comprises at least one longitudinally arranged support cavity 121 and a plurality of head protection cavities 122. Wherein, 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 between the door apron after inflation and deployment, to reduce the pitching movement of the occupant's head in a small offset collision event; wherein the plurality of head protection cavities 122 are arranged in sequence on the side of the support cavity 121 away from the rear buffer cavity, which is used to receive the occupant's head when side collision occurs, to protect the occupant's head.

[0102] More specifically, in side collision, the occupant's head collides transversely in the direction of the window, at this time, after the side air curtain 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 collides forward in the direction of the window, at this time, the support cavity 121 can receive the occupant's head to protect the occupant's head.

[0103] As Figure 1As shown, the A area in the figure is the approximate area of receiving the passenger's head during side impact, and the support cavity 121 is used to receive the passenger's head during small offset impact.

[0104] Further, the front end buffering cavity 18 is arranged in the front end of the bag 10 and connected with the front protection cavity 11 through the front end air channel, and the front end buffering cavity 18 is used to buffer the front protection cavity 11.

[0105] The inflation diameter of the front end air channel is 30mm, and the 2d laying length is 45mm.

[0106] The front end air channel is a small air channel, so when the front protection cavity 11 is full, the front end buffering cavity 18 is not full, so that when the front protection cavity 11 is hit by the passenger, the gas in the front protection cavity 11 can enter the front end buffering cavity 18 to play a buffering role, avoiding too much pressure in the front protection cavity 11 to cause harm to the passenger.

[0107] In some embodiments, when the passenger in the vehicle is seated at a large inclination angle and the bag 10 is inflated and deployed, the first rear buffering cavity 1321 corresponds to the head of the passenger, so as to protect the head of the passenger when the passenger is seated at a large inclination angle.

[0108] The combination of the multiple small air channels and the non-inflated area of the present application makes the buffering area 13 thicken while maximizing the coverage, so that the protection cavity inflates faster and fills up in time to support the passenger's head, and the small air channel limits the simultaneous inflation of the gas into the buffering cavity, and the buffering cavity can also store the squeezed gas after the passenger is dynamically hit.

[0109] In the present specification, the same and similar parts among various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments. Especially, for the product embodiment described later, since it corresponds to the method, the description is relatively simple, and the relevant part can be referred to the part of the system embodiment.

[0110] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A side curtain airbag, comprising a pouch, the pouch including a front protective cavity and a rear protective cavity, characterized in that, It also includes a buffer area, which is disposed between the front protective cavity and the rear protective cavity, and a gas passage cavity is formed between the buffer area and the top edge of the pouch, the gas passage cavity being connected to the front protective cavity, the rear protective cavity and the buffer area respectively; The buffer area includes: A front buffer cavity is provided close to the front protection cavity and has an L-shaped structure. The longitudinal portion of the front buffer cavity is at least configured to correspond to the B-pillar of the car, and the lateral portion extends at least beyond the back of the front seat of the car. A 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. The rear buffer chamber is at least configured to correspond to the seatless area between the B-pillar and the rear seat of the car. The non-inflatable part 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. The primary rear buffer cavity extends along the rear bottom edge of the pouch and communicates with the front buffer cavity. The secondary rear buffer cavity is located on the opposite side of the primary rear buffer cavity and communicates with the primary rear buffer cavity through a secondary air passage formed between the non-inflatable part and the edge of the rear buffer cavity. The front protective chamber is connected to the gas passage chamber via a front air passage, and the rear protective chamber is connected to the gas passage chamber via a rear air passage; Wherein, the expansion size of the primary airway is smaller than that of the front airway and the rear airway, so that the gas entering the bag first fills the front protective cavity and the rear protective cavity; The pouch also includes: A first suture portion extends from the front bottom suture of the pouch toward the gas passage cavity, and a transverse front buffer cavity is formed between the first suture portion and the bottom suture of the pouch. The second suture portion extends upward from the rear bottom suture of the pouch to the gas passage cavity, and then sequentially extends to the front end and the bottom end of the pouch. The rear buffer cavity is formed between the second suture portion and the bottom suture of the pouch. The primary airway is formed between the tail of the second suture portion and the tail of the first suture portion. The non-inflatable portion is spaced apart from the head and / or tail of the second suture portion to form the secondary airway. Wherein, the portion of the second suture extending toward the bottom of the pouch forms a longitudinal front buffer cavity between the tail of the first suture and the tail of the first suture. The transverse front buffer cavity and the longitudinal front buffer cavity together constitute the front buffer cavity.

2. The side curtain air vent according to claim 1, characterized in that, The bottom center of the bag is concave upwards to form a concave portion, and the bottom center of the bag extends from the concave portion to both sides in a figure-eight shape to reduce the volume of the front buffer cavity and the rear buffer cavity.

3. The side curtain air vent according to claim 2, characterized in that, The annular suture forming the non-inflatable part is arc-shaped towards the middle of the bottom end of the bladder, so that the primary rear buffer cavity is arc-shaped.

4. The side curtain air vent according to claim 3, characterized in that, The middle part of the first suture portion protrudes in the direction of the second suture portion to reduce the rate at which gas enters the front buffer chamber of the transverse portion.

5. The side curtain air vent according to claim 4, characterized in that, The buffer area also includes: A suture locking part is located between the air inlet of the secondary rear buffer chamber and the first suture part, and is correspondingly disposed to the middle part of the first suture part. It is used to divert the gas entering from the primary air passage to the rear buffer chamber and the transverse front buffer chamber.

6. The side curtain air vent according to claim 1, characterized in that, The rear protection cavity includes at least a longitudinally arranged support cavity, which is adjacent to the rear buffer cavity. After inflation and deployment, the support cavity forms a strong support with the door panel to reduce the pitching motion of the occupant's head in a small offset collision event.

7. The side curtain air vent according to claim 1, characterized in that, The pouch also includes: The front end buffer cavity is located at the front end of the bag and is connected to the front protection cavity through the front end air passage.

8. The side curtain air vent according to claim 1, characterized in that, When the occupant is seated at a large angle and the bladder is inflated and deployed, the primary rear buffer chamber corresponds to the occupant's head.

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