Knee safety air bag and vehicle

Abstract

The invention provides a knee safety air bag and a vehicle, the knee safety air bag comprises an air bag body, the air bag body is formed by folding and sewing an air bag cloth piece, the air bag cloth piece is provided with a dragging structure, and the dragging structure is formed by sewing partial areas on the air bag cloth piece through sewing threads; when the airbag body is unfolded, the dragging structure drags the two side parts of the airbag body, so that the part, opposite to the knees of a passenger, in the airbag body is close to an instrument panel; the air bag cloth piece is further provided with an outer protruding structure which is formed by sewing a part of areas on the air bag cloth piece through sewing threads. When the air bag body is unfolded, the part, opposite to the knees of the passenger, in the air bag body is close to the instrument panel. When the air bag body is unfolded, the dragging structure and the convex structure enable the part, opposite to the knees of a passenger, in the air bag body to be more than the instrument panel, so that the air bag body can be better in an L-shaped structure, and the L-shaped structure can not only prevent the knees and the shanks from directly impacting the instrument panel, but also can avoid the situation that the knees and the shanks are possibly impacted due to overlarge air pressure in an inner cavity of the L-shaped structure.

Description

Technical Field

[0001] The present application relates to the field of vehicle safety technology, and in particular to a knee airbag, and also to a vehicle. Background Art

[0002] Knee airbag (KAB) is an important part of the vehicle's passive safety system and is usually installed under the vehicle dashboard and close to the driver or passenger. When the sensor detects a vehicle collision, the knee airbag will quickly inflate and deploy to form a buffer zone to absorb energy and prevent the driver or passenger's knees and calves from directly hitting the hard vehicle interior structure.

[0003] When a vehicle collides, the knee airbag deploys quickly to protect the driver or passenger's knees and calves. Therefore, during the inflation and deployment of the knee airbag, the deployed knee airbag needs to be closer to the vehicle's dashboard. This can prevent the knee and calf from directly hitting the vehicle's internal structure during the deployment of the knee airbag, and can also prevent the knee and calf from being impacted by excessive air pressure in the knee airbag's inner cavity during the instant deployment of the knee airbag.

[0004] Therefore, there is an urgent need for a knee airbag that can be moved close to the instrument panel when it is deployed so that the knee and calf can be better protected. Summary of the invention

[0005] The present application provides a knee airbag to solve the problem of how to make the deployed knee airbag closer to the dashboard of the vehicle when an accident occurs, so as to better protect the knees and calves. The present application also provides a vehicle using the above-mentioned knee airbag.

[0006] The present application provides a knee safety airbag, comprising: an airbag body, the airbag body being formed by folding and sewing an airbag cloth sheet, the airbag cloth sheet being provided with a pulling structure, the pulling structure being formed by sewing a partial area on the airbag cloth sheet with a sewing thread;

[0007] When the airbag body is deployed, the pulling structure pulls the two side portions of the airbag fabric sheet located on the pulling structure to each other, so that the portion of the airbag body opposite to the passenger's knee is close to the dashboard of the vehicle, and the pulling structure is located on the side of the knee airbag close to the dashboard; the airbag fabric sheet is also provided with an outward convex structure, and the outward convex structure is formed by sewing a part of the area on the airbag fabric sheet with sewing thread;

[0008] When the airbag body is deployed, the outwardly protruding structure makes the part of the airbag body opposite to the passenger's knees close to the dashboard of the vehicle, and the outwardly protruding structure is located on a side of the knee safety airbag away from the dashboard.

[0009] Optionally, the air bag fabric sheet is a one-piece structure;

[0010] Alternatively, the airbag fabric piece is formed by sewing a plurality of fabric pieces.

[0011] Optionally, the air bag fabric sheet is provided with openings, and the openings are sewn to form the pulling structure;

[0012] The opening is an elliptical structure, and two sides of the longitudinal axis of the elliptical structure are sewing areas.

[0013] Optionally, when the airbag fabric piece is formed by sewing multiple fabric pieces, the airbag fabric piece includes a first fabric piece and a second fabric piece, the first side edge of the first fabric piece and the second side edge of the second fabric piece are both concave structures, the first side edge and the second side edge are sewn, and the edges of the two concave structures after sewing form the pulling structure.

[0014] Optionally, a third cloth piece is further included, the third side edge of the second cloth piece and the fourth side edge of the third cloth piece are both convex structures, the third side edge and the fourth side edge are sewn together, and the two convex structures after sewing form the outer convex structure;

[0015] The convex structure is located in the middle of the second cloth piece and the third cloth piece, and the upper and lower ends of the convex structure gradually retract into the inside of the second cloth piece and the third cloth piece to form a smooth convex structure.

[0016] Optionally, a shrinkage structure is also provided on the airbag cloth piece, and the shrinkage structure is formed by sewing a partial area on the airbag cloth piece by sewing thread. The shrinkage structure is used to cooperate with the convex structure so that the part of the airbag body opposite to the occupant's knees is close to the dashboard of the vehicle. When the airbag body is deployed, the distance between the shrinkage structure and the convex structure is less than a preset value.

[0017] Optionally, it further includes a plurality of ventilation straps, which are distributed at intervals and fixed on the airbag fabric sheet, the plurality of ventilation straps divide the inner cavity of the airbag body into a plurality of interconnected cavities, and the plurality of ventilation straps are provided with ventilation holes.

[0018] Optionally, it further includes an external drawstring, a first end of which is fixed to the airbag fabric sheet, and a second end of which is fixed to a gas generator, and the gas generator is disposed inside the airbag body.

[0019] Optionally, a plurality of ear pieces are provided on the edge of the airbag cloth piece, and overlapping ear pieces are present when the airbag cloth piece is folded, and the overlapping ear pieces are sewn together, and when the knee airbag is inflated, the sewn ear pieces cause a portion of the airbag body connected to the vehicle shell and an opposite portion thereof to be pulled toward each other, so that the portion of the airbag body opposite to the occupant's knee is close to the dashboard of the vehicle.

[0020] The present application also provides a vehicle, comprising any one of the above-mentioned knee airbags.

[0021] Compared with the prior art, this application has the following advantages:

[0022] The present application provides a knee airbag, comprising: an airbag body, which is formed by folding and sewing an airbag cloth sheet, wherein a pulling structure is provided on the airbag cloth sheet, and the pulling structure is formed by sewing a partial area on the airbag cloth sheet by sewing thread; when the airbag body is deployed, the pulling structure pulls the two side parts of the airbag cloth sheet located on the pulling structure to each other, so that the part of the airbag body opposite to the occupant's knee is close to the dashboard of the vehicle, and the pulling structure is located on the side of the knee airbag close to the dashboard; the airbag cloth sheet is also provided with an outward convex structure, and the outward convex structure is formed by sewing a partial area on the airbag cloth sheet by sewing thread; when the airbag body is deployed, the outward convex structure makes the part of the airbag body opposite to the occupant's knee close to the dashboard of the vehicle, and the outward convex structure is located on the side of the knee airbag far from the dashboard.

[0023] The present application provides a pulling structure on the airbag fabric sheet, and the pulling structure is located on the side of the knee airbag close to the instrument panel. When the airbag body is deployed, the pulling structure on the airbag fabric sheet will pull parts of the areas on both sides of the airbag body to each other, so that the part of the airbag body that is opposite to the passenger's knee is closer to the vehicle's instrument panel, so that the airbag body can better present an L-shaped structure. The L-shaped structure can not only prevent the knee and calf from directly hitting the instrument panel, but also prevent the excessive air pressure in its inner cavity from impacting the knee and calf. At the same time, the airbag fabric sheet is also provided with an outward convex structure, and the outward convex structure is located on the side of the knee airbag away from the instrument panel. When the airbag body is deployed, the outward convex structure makes the part of the airbag body that is opposite to the passenger's knee close to the vehicle's instrument panel. It can be understood that when the outward convex structure is deployed by the airbag body, the gas in the inner cavity of the airbag body generates a force at the outward convex structure. The reaction force of the force will cause the tail of the airbag body to tilt toward the dashboard and away from the occupant's knees, which can further enable the airbag body to better present an L-shaped structure so as to better protect the occupant's knees and calves.

[0024] A plurality of ear pieces are arranged on the edge of the airbag cloth piece, and overlapping ear pieces are present when the airbag cloth piece is folded, and the overlapping ear pieces are sewn together. When the knee airbag is inflated, the sewn ear pieces cause the portion of the airbag body connected to the vehicle shell and the portion opposite thereto to be mutually entangled, that is, the front and rear of the airbag body are mutually entangled, so that the portion of the airbag body opposite to the occupant's knee is close to the dashboard of the vehicle, so that the airbag body can better present an L-shaped structure, and can better protect the occupant's knees and calves. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a knee airbag provided in an embodiment of the present application.

[0026] Figure 2 This is a schematic structural diagram of a one-piece airbag fabric provided in an embodiment of the present application, in which the sewing tracks and closing lines on the airbag fabric are not sewn.

[0027] Figure 3 It is a schematic diagram of the structure of a one-piece airbag fabric provided in an embodiment of the present application, and the sewing tracks on the airbag fabric after being sewn (i.e., the pulling structure) and the closing lines after being sewn (i.e., the convex structure).

[0028] Figure 4 It is a structural schematic diagram of a one-piece airbag fabric provided in an embodiment of the present application, wherein the sewing tracks on the airbag fabric are sewn (i.e., the pulling structure) and the closing lines are sewn (i.e., the convex structure), and folded along the center line P of the convex structure.

[0029] Figure 5 It is a structural schematic diagram that the air bag fabric provided in an embodiment of the present application is composed of two fabric pieces, an open hole structure is provided on the first fabric piece, and a closed line is provided on the second fabric piece.

[0030] Figure 6 It is a schematic diagram of the structure after the open hole structure is sewn on the first cloth piece (i.e., the pulling structure) provided in an embodiment of the present application.

[0031] Figure 7 It is a schematic diagram of the structure of the second cloth piece after the closing line is sewn on the second cloth piece (i.e., the convex structure) provided in an embodiment of the present application.

[0032] Figure 8 It is a structural schematic diagram of the second cloth piece provided in an embodiment of the present application after the closing line is sewn and folded along the center line P of the convex structure.

[0033] Fig. 9 It is a schematic structural diagram of an air bag fabric provided in an embodiment of the present application, which is composed of three pieces of fabric and the fabric pieces are not sewn together.

[0034] Fig.10 It is a schematic diagram of the structure of the folded air bag cloth provided in an embodiment of the present application.

[0035] Fig.11 It is a schematic diagram of the structure of the second folded air bag cloth sheet provided in an embodiment of the present application.

[0036] Fig.12 It is a cross-sectional view of the convex structure provided in an embodiment of the present application.

[0037] Fig.13 It is a cross-sectional view of the contraction structure provided in an embodiment of the present application.

[0038] Fig.14 It is a schematic diagram of the structure of the external drawstring provided in the embodiment of the present application.

[0039] Fig.15 It is a schematic diagram of the structure of the ventilation drawstring provided in the embodiment of the present application.

[0040] Reference numerals:

[0041] 10: Airbag body;

[0042] 20: air bag fabric; 20-a: opening; 20-b: sewing track; 20-c: closing line; 20-d: contraction track;

[0043] 201: pulling structure; 202: convex structure; 203: ear piece; 204: contraction structure;

[0044] 30: cloth piece; 301: first cloth piece; 3011: first side edge;

[0045] 302: second cloth piece; 3021: second side edge; 3022: third side edge;

[0046] 303: third piece of fabric; 3031: fourth side edge;

[0047] 40: ventilation strap; 401: ventilation hole;

[0048] 50: external drawstring; 501: first end; 502: second end;

[0049] 60: gas generator; 70: instrument panel; 80: housing; 90: cover. DETAILED DESCRIPTION

[0050] Many specific details are described in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present application, so the present application is not limited by the specific implementation disclosed below.

[0051] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the related art, when a vehicle has an accident, the knee airbag installed under the dashboard is deployed quickly in a short time to form an L-shaped buffer zone. The L-shaped knee airbag not only blocks the possibility of the knee and calf directly hitting the dashboard, but also provides additional support and buffering through the L-shaped structure, thereby minimizing the risk of injury. However, during the deployment process of the current L-shaped knee airbag, on the one hand, the effect of the knee airbag presenting an L-shaped structure is not good. The L-shaped structure may be far away from the dashboard and cannot better protect the knees and calves of the occupants; on the other hand, the L-shaped structure is relatively close to the legs of the occupants. During the deployment process, the excessive air pressure in its inner cavity may impact the knees and calves, and may also cause secondary injuries to the occupants.

[0054] In view of this, in order to make the knee airbag closer to the dashboard during the deployment process, it is also possible to avoid excessive air pressure in its inner cavity that may impact the knee and calf. The present application provides a knee airbag, comprising: an airbag body, which is formed by folding and sewing an airbag cloth sheet, wherein a pulling structure is provided on the airbag cloth sheet, and the pulling structure is formed by sewing a partial area on the airbag cloth sheet by sewing thread; when the airbag body is deployed, the pulling structure pulls the two side parts of the airbag cloth sheet located on the pulling structure to each other, so that the part of the airbag body opposite to the occupant's knee is close to the dashboard of the vehicle, and the pulling structure is located on the side of the knee airbag close to the dashboard; the airbag cloth sheet is also provided with an outward convex structure, and the outward convex structure is formed by sewing a partial area on the airbag cloth sheet by sewing thread; when the airbag body is deployed, the outward convex structure makes the part of the airbag body opposite to the occupant's knee close to the dashboard of the vehicle, and the outward convex structure is located on the side of the knee airbag far from the dashboard.

[0055] It can be understood that the airbag fabric is provided with a pulling structure and an outward convex structure, the pulling structure is located on the side of the knee airbag close to the instrument panel, and the outward convex structure is located on the side of the knee airbag far from the instrument panel. When the airbag body is deployed, the pulling structure on the airbag fabric will cause the partial areas on both sides of it to pull each other, so that the part of the airbag body opposite to the occupant's knee is closer to the vehicle's instrument panel. At the same time, when the airbag body is deployed, the gas in the inner cavity of the airbag body generates a force at the outward convex structure, and the reaction force of the force will cause the tail of the airbag body to tilt toward the instrument panel and away from the occupant's knee, so that the airbag body can better present an L-shaped structure. The L-shaped structure can not only prevent the knee and calf from directly hitting the instrument panel, but also prevent the excessive air pressure in its inner cavity from impacting the knee and calf.

[0056] Next, the knee airbag provided by the present application will be described in detail with reference to the accompanying drawings.

[0057] The present application provides a knee airbag, such as Figure 1 As shown in the figure, the knee air bag (KAB) generally has an L-shaped structure during the deployment process. The knees and calves of the human body usually present a certain angle when driving or sitting. The L-shaped structure is more in line with this natural form, which can better wrap the legs when deployed and provide tighter protection.

[0058] like Figure 1 and Figure 2 As shown, the knee airbag includes an airbag body 10, and the airbag body 10 is formed by folding and sewing an airbag fabric sheet 20. It can be understood that the structure of the airbag body 10 can be formed by folding the airbag fabric sheet 20 and sewing the folded airbag fabric sheet 20.

[0059] like Figure 2-4 As shown, the air bag fabric sheet 20 is a one-piece structure; or, as Figure 5 and Fig. 9 As shown, the airbag fabric piece 20 is formed by sewing a plurality of fabric pieces 30. It can be understood that the airbag fabric piece 20 can be a one-piece structure, or can be formed by sewing a plurality of fabric pieces, such as two or three fabric pieces, into a whole. It can be selected whether the airbag fabric piece 20 is a one-piece structure or is formed by sewing a plurality of fabric pieces 30 according to specific actual working conditions. In other words, the airbag fabric piece is formed by sewing a whole piece of fabric or a plurality of fabric pieces, and the airbag fabric piece is then folded and sewn to form the airbag body.

[0060] The airbag fabric 20 is generally made of nylon fabric or polyester fabric, etc., because it has high strength and durability and can withstand the impact force generated by the vehicle during a collision. Figure 1 As shown, the gas generator 60 provided in the airbag body 10 will generate a large amount of gas, such as nitrogen, when a vehicle collides, which will cause the knee airbag to expand rapidly to form an L-shaped buffer zone, thereby protecting the knees and calves of passengers or drivers in the vehicle and preventing the passengers or drivers from being injured by their knees or calves hitting the interior of the vehicle.

[0061] In addition, the airbag body is provided with an air inlet (not shown), which is responsible for inputting the gas generated by the gas generator into the inner cavity of the airbag body from the air inlet. Of course, the gas generator can also be directly installed in the inner cavity of the airbag body. When the gas generator generates and outputs gas, the gas enters the inner cavity of the airbag body for inflation, so that the airbag body expands and deploys rapidly.

[0062] The airbag fabric sheet 20 is provided with a pulling structure 201, and the pulling structure 201 is formed by sewing a part of the airbag fabric sheet by sewing thread. Figure 1 , Figure 3-4 and Figure 6 The pulling structure 201 may be provided on the airbag fabric sheet 20, and the pulling structure 201 is provided on the airbag fabric sheet 20 close to where the gas generator 60 is fixed and close to the instrument panel when the airbag body is deployed. Figure 1 As shown, when the airbag body 10 is deployed, the pulling structure 201 is closer to the end of the gas generator 60 , and the pulling structure 201 is also closer to one side of the instrument panel 70 .

[0063] like Figure 1 As shown, the pulling structure 201 is arranged during the deployment process of the airbag body 10, near the side where the gas generator 60 is fixed and near the instrument panel 70, and the head of the knee airbag with the gas generator 60 is fixed on the vehicle body, that is, the head of the knee airbag is a fixed end, and the tail opposite to the head is a free end. The left and right sides of the pulling structure 201 will generate pulling force, and the pulling force makes the tail of the knee airbag tilt toward the direction of the instrument panel, so that the knee airbag is closer to the vehicle instrument panel and can better present an L-shaped structure, which can better protect the knees and calves of the occupants or drivers.

[0064] like Figure 1 and Figure 2As shown, the pulling structure 201 is formed by sewing a part of the airbag fabric sheet with sewing thread. Specifically, the pulling structure 201 can be two pre-set sewing tracks 20-b on the airbag fabric sheet near the fixed gas generator 60 and the instrument panel 70, and can be sewn according to the pre-set two sewing tracks 20-b, that is, the pulling structure 201 is formed in the sewing area. In the embodiment of the present application, as Figure 2 As shown, the two sewing tracks 20-b can be two arcs pre-set on the air bag fabric 20, and the two arcs are symmetrically arranged on the air bag fabric 20. After the two arcs are sewn together, the air bag fabric 20 is formed as shown in FIG. Figure 3 The pulling structure 201 is shown. Of course, the sewing track 20-b does not exclude other structures, such as two straight lines, etc. Here, the two pre-set sewing tracks 20-b are no longer listed one by one.

[0065] In addition to the above, the two sewing tracks 20-b can be directly pre-set on the air bag fabric 20, and the two sewing tracks 20-b can be sewn together to form the pulling structure 201. The air bag fabric 20 can also be provided with an opening 20-a such as Figure 5 As shown, the opening 20-a is sutured to form the pulling structure 201 as shown in FIG. Figure 6 It can be understood that the opening 20-a is provided on the airbag fabric 20 near the fixed gas generator and the instrument panel. Figure 5 As shown, the opening 20-a is an elliptical structure, and the two sides of the longitudinal axis of the elliptical structure are symmetrical structures. That is, the opening 20-a is an elliptical structure, and the symmetrical structure is sewn to sew the opening, and the sewed opening 20-a forms the pulling structure 201 as shown in FIG. Figure 6 In the embodiment of the present application, there is no specific limitation on the size and number of the openings 20 - a , as long as the industry requirements are met.

[0066] The above two pulling structures 201 can be arranged on a one-piece airbag fabric sheet, or on an airbag fabric sheet 20 formed by sewing a plurality of fabric sheets 30. Of course, the structure of the airbag fabric sheet 20 can be determined according to the specific working conditions.

[0067] In the embodiment of the present application, the air bag cloth sheet can be formed by sewing two cloth sheets, and the opening is arranged on the cloth sheet on which the fixed gas generator is arranged, such as Figure 5 and Figure 6As shown, the circumference of the cloth piece does not change when the opening 20-a is not sewn and when the opening 20-a is sewn to form the pulling structure 201, that is, when the opening 20-a is not sewn, the circumference of the cloth piece is L1, and after the opening 20-a is sewn along its longitudinal axis, the circumference of the cloth piece is still L1, that is, before and after the opening 20-a is sewn, the circumference of the cloth piece does not change. The circumference of the cloth piece with the opening structure is L1, and the circumference of the other cloth piece is L2, and L2>L1. The specific lengths of L1 and L2 can be determined according to the specific working conditions.

[0068] In addition to the above two types of pulling structures 201, there is another pulling structure 201, which is mainly arranged on the air bag fabric sheet 20 formed by sewing a plurality of fabric sheets 30. Fig. 9 As shown, when the airbag fabric piece 20 is formed by sewing a plurality of fabric pieces 30, the airbag fabric piece 20 includes a first fabric piece 301 and a second fabric piece 302, the first side edge 3011 of the first fabric piece and the second side edge 3021 of the second fabric piece are both concave structures, the first side edge 3011 and the second side edge 3021 are sewn, and the edges of the two concave structures after sewing form the pulling structure 201.

[0069] Specifically, the air bag fabric is formed by sewing a plurality of fabric pieces 30. Fig. 9 As shown, the airbag cloth piece includes a first cloth piece 301 and a second cloth piece 302, and the first side edge 3011 of the first cloth piece and the second side edge 3021 of the second cloth piece are both configured as concave structures, and the sizes and shapes of the two concave structures are the same, so that when the first side edge 3011 and the second side edge 3021 are sewn, the first side edge 3011 and the second side edge 3021 can be better fitted, so as to sew the two sides, and at the same time, when the airbag body is deployed, the gas can flow better.

[0070] After the first side 3011 and the second side 3021 are sewn together, the edges of the two sewn concave structures form the pulling structure 201. Specifically, the pulling structure is formed by sewing the concave structures on the first side 3011 and the second side 3021 together.

[0071] It should be noted that no matter which of the above methods is used to form the pulling structure, the position and function of the pulling structure are the same.

[0072] like Figure 1As shown, the pulling structure 201 is mainly used to pull the two side parts of the airbag cloth sheet 20 located on the pulling structure 201 to each other when the airbag body 10 is deployed, so that the part of the airbag body 10 opposite to the occupant's knee is close to the dashboard 70 of the vehicle. The pulling structure 201 is located on the side of the knee airbag close to the dashboard 70.

[0073] Specifically, when the sensor detects that the vehicle has collided, the knee airbag installed on the dashboard 70 will be deployed quickly. The head of the airbag body 10 is fixed on the vehicle body, and the tail opposite to the head is a free end. At this time, the two side parts of the pulling structure 201 located on the side of the knee airbag close to the dashboard 70 will be pulled together. In other words, when the knee airbag is deployed, the two side parts of the pulling structure 201 will be pulled together, which will cause the free end of the tail to tilt toward the dashboard 70, that is, the tail will be away from the legs of the occupant or driver, so that the knee airbag can better form an L-shaped structure, which can prevent the knee or calf of the occupant or driver from hitting the inside of the vehicle. At the same time, the tail is away from the legs of the occupant or driver, which can also prevent the pressure in its inner cavity from being too high, which may impact the knee or calf of the occupant or driver.

[0074] It can be understood that due to the position of the pulling structure 201 and the role of the pulling structure 201 in the deployment process of the airbag body 10, that is, the pulling structure 201 is located on the side of the knee airbag close to the instrument panel 70, when the airbag body 10 is deployed, the two sides of the pulling structure 201 generate a mutually pulling force, and the mutually pulling force will further cause the tail to tilt toward the instrument panel 70. During the deployment process of the airbag body 10, when the head is fixed, the tail opposite to the head tilts toward the instrument panel 70, so that the knee airbag can better present an L-shaped structure.

[0075] In addition to the above-mentioned pulling structure 201 being provided on the air bag fabric sheet, Figure 1 , Figure 3-4 , Figure 7-8 , Fig.10 and Fig.12 As shown, the airbag fabric sheet 20 is also provided with an outer convex structure 202, and the outer convex structure 202 is formed by sewing a part of the area on the airbag fabric sheet by sewing thread; Figure 1 When the airbag body 10 is deployed, the convex structure 202 makes the portion of the airbag body 10 opposite to the passenger's knees close to the vehicle's instrument panel 70, and the convex structure 202 is located on the side of the knee airbag away from the instrument panel. Fig.12, is a cross-sectional view of an outer convex structure 202 provided on a one-piece structure or two sewn airbag fabric sheets, Fig.12 From the cross-sectional view of the upper convex structure, it can be seen that the convex structure is formed by sewing a partial area on the airbag fabric sheet by sewing thread.

[0076] like Figure 1 As shown, in addition to the pulling structure 201, the airbag fabric sheet is also provided with an outer convex structure 202, and when the airbag body 10 is deployed, the outer convex structure 202 is opposite to the pulling structure 201. It can be understood that when the airbag body 10 is deployed, the pulling structure 201 is close to one side of the instrument panel 70, and the outer convex structure 202 is away from one side of the instrument panel 70, that is, the outer convex structure 202 is close to the legs of the occupant or driver.

[0077] like Figure 3 As shown, when the airbag fabric sheet 20 is an integrated structure and is not folded or sewn, the pulling structure 201 is located on the airbag fabric sheet 20 close to the side where the gas generator is fixed, and the convex structure 202 is opposite to the pulling structure 201. Then, the convex structure 202 is located on the airbag fabric sheet 20 away from the side where the gas generator is fixed. Figure 1 As shown, after the airbag fabric sheet 20 is folded and sewn, when the airbag body 10 is deployed, the pulling structure 201 is close to one side of the instrument panel 70, and the convex structure 202 is away from one side of the instrument panel 70, that is, the convex structure 202 is close to the legs of the occupant or driver.

[0078] like Figure 1 As shown, the convex structure 202 is formed by sewing a part of the area on the airbag fabric sheet 20 with sewing thread. When the airbag body 10 is deployed, the gas in the inner cavity of the airbag body 10 will quickly rush to the convex structure 202, and the convex structure 202 will protrude toward the outside of the airbag body 10, that is, toward the leg of the passenger or driver. At this time, a force is generated at the convex structure 202, and the reaction force of the force at this place will make the tail away from the leg of the passenger or driver, even if the tail is tilted toward the direction of the instrument panel 70, so that the knee airbag can better present an L-shaped structure.

[0079] When the airbag fabric piece 20 is formed by sewing a plurality of fabric pieces 30 , the pulling structure 201 is formed by sewing the first side edge 3011 and the second side edge 3021 . The formation process of the convex structure 202 will be described in detail below.

[0080] like Fig. 9As shown, the airbag fabric piece 20 also includes a third fabric piece 303, the third side edge 3022 of the second fabric piece and the fourth side edge 3031 of the third fabric piece are both convex structures, the third side edge 3022 and the fourth side edge 3031 are sewn, and the two convex structures after sewing form the convex structure; the convex structure is located in the middle position of the second fabric piece 302 and the third fabric piece 303. It should be noted that the middle position of the second fabric piece 302 and the middle position of the third fabric piece 303 are the parts of the third side edge 3022 and the fourth side edge 3031 that protrude toward each other, and the upper and lower ends of the convex structure are gradually retracted toward the inside of the second fabric piece 302 and the third fabric piece 303, and a smooth convex structure is formed.

[0081] Specifically, when the air bag fabric sheet 20 is formed by sewing a plurality of fabric sheets 30, as shown in FIG. Fig. 9 As shown, the airbag fabric piece 20 can be formed by sewing three fabric pieces 30, that is, the airbag fabric piece 20 includes a first fabric piece 301, a second fabric piece 302 and a third fabric piece 303, the first side edge 3011 of the first fabric piece and the second side edge 3021 of the second fabric piece are sewn together, and the pulling structure is formed by the first side edge 3011 and the second side edge 3021. The third side edge 3022 on the second fabric piece is opposite to the second side edge 3021, that is, the second side edge 3021 and the third side edge 3022 are two opposite side edges on the second fabric piece 302. The fourth side edge 3031 is a side edge on the third fabric piece 302, and the third side edge 3022 is sewn with the fourth side edge 3031, that is, the third side edge 3022 and the fourth side edge 3031 are both provided with convex structures.

[0082] The convex structure is located in the middle of the third side edge 3022 on the second cloth piece and the fourth side edge 3031 on the third cloth piece, that is, the convex structure gradually retracts from the upper and lower ends of the third side edge 3022 and the fourth side edge 3031 toward the inside of the second cloth piece 302 and the third cloth piece 303. It can be understood that the ends of the third side edge 3022 and the fourth side edge 3031 are retracted toward the inside of the corresponding cloth piece, so that the middle position of the cloth piece protrudes outward in the direction of the relative cloth piece, so that a smooth convex structure can be formed.

[0083] After the convex structure of the third side 3022 and the convex structure of the fourth side 3031 are sewn together, a partial area of ​​the third side 3022 and a partial area of ​​the fourth side 3031 overlap after sewing, and a triangle-like structure will exist at the upper and lower ends of the non-overlapping area of ​​the third side 3022 and the fourth side 3031, and it will be folded along the third side 3022 or the fourth side 3031, and the symmetrical sides of the triangle-like structure will be sewn to the other symmetrical sides to form a convex structure.

[0084] The above is an outward convex structure provided on an airbag fabric piece sewn from three pieces of fabric. Of course, an outward convex structure may also be provided on an airbag fabric piece sewn from two pieces of fabric, and the sewing line is the side edge provided with the convex structure.

[0085] Of course, the convex structure 202 can also be provided on a one-piece airbag fabric sheet 20, or the airbag fabric sheet 20 is formed by sewing a plurality of fabric sheets 30, but the sewing line is not provided on the side with the convex structure. Figure 2 and Figure 5 As shown, the convex structure is arranged at the upper and lower ends of the cloth sheet far away from the fixed gas generator, and symmetrical closed lines 20-c are respectively arranged at the upper and lower ends, and the symmetrical closed lines 20-c extend toward the inside of the airbag cloth sheet to reduce the distance between the symmetrical closed lines 20-c until the symmetrical closed lines 20-c intersect, and one of the closed lines 20-c is folded along its symmetry axis toward another closed line 20-c and sewed, as shown in FIG. Figure 3 , Figure 4 , Figure 7-8 and Fig.12 As shown, an outer convex structure 202 is formed. It should be noted that in the embodiment of the present application, there is no specific restriction on the number of the outer convex structures, and a suitable number of the outer convex structures can be set according to specific circumstances.

[0086] In the embodiment of the present application, when the air bag fabric sheet 20 is formed by sewing two fabric sheets, such as Figure 5 An open hole structure 20-a is provided on the cloth sheet provided with the fixed gas generator, and the open hole structure 20-a is sewn to form a pulling structure 201 as shown in FIG. Figure 6 A closing line 20-c is set on another piece of cloth, and the closing line 20-c is sewn to form an outer convex structure 202 as shown. Figure 7 As shown, the perimeter of the cloth piece with the open hole structure 20-a is L1, and the perimeter of the cloth piece with the closed line 20-c is L2. At this time, L2>L1. After the closed line 20-c is sewn, the perimeter of the cloth piece of the convex structure 202 formed after sewing is L3. Figure 7 As shown, and L3=L1, at this time, the two pieces of cloth can be sewn together.

[0087] The air bag fabric is also provided with a contraction structure 204, and the contraction structure 204 is formed by sewing a part of the air bag fabric by sewing thread, such as Figure 2 As shown, a shrinkage track 20-d is preset on the cloth piece, and the sewing thread is sewn along the shrinkage track 20-d to form a Figure 3 or Fig.13The contraction structure 204 is used to cooperate with the convex structure 202 to make the part of the airbag body opposite to the passenger's knees close to the dashboard of the vehicle. When the airbag body is deployed, the distance between the contraction structure and the convex structure is less than a preset value.

[0088] like Figure 3 As shown, in addition to the pulling structure 201 and the convex structure 202, the airbag fabric is also provided with a contraction structure 204, which is located on a side close to the convex structure 202 and away from the pulling structure 201, so that when the airbag body is deployed, the distance between the contraction structure and the convex structure is less than a preset value, and the preset value can be determined according to specific working conditions. It can be understood that if the airbag fabric is formed by sewing multiple fabrics, the contraction structure can be set on the second fabric or the third fabric, and close to the convex structure.

[0089] like Fig.13 As shown, the shrinkage structure 204 is formed by sewing a partial area on the airbag cloth piece along the shrinkage trajectory with sewing thread. The shrinkage structure 204 can reduce the excess volume on both sides thereof and enable the volume of the center of the relative shrinkage structure and the relative convex structure to expand better. When the airbag body is deployed, the shrinkage structure can cooperate with the convex structure to enable the portion of the airbag body opposite to the occupant's knee to be close to the dashboard of the vehicle.

[0090] It should be noted that, in the embodiment of the present application, the distance between the contraction structure and the convex structure, i.e., the preset value, and the size and number of the stitching of the contraction structure can be determined according to the specific working conditions. In the embodiment of the present application, the number of the contraction structures is two, and the two contraction structures are distributed near the two convex structures, so as to cooperate with the convex structures, so that the part of the airbag body opposite to the occupant's knee is close to the dashboard of the vehicle, so that the airbag body can better present an L-shaped structure.

[0091] like Fig.15 As shown, the knee airbag further comprises a plurality of ventilation straps 40, which are distributed at intervals and fixed on the airbag fabric sheet. The plurality of ventilation straps 40 divide the inner cavity of the airbag body into a plurality of interconnected cavities such as Figure 1 As shown, the plurality of ventilation straps 40 are provided with ventilation holes.

[0092] Specifically, Fig.10As shown, a plurality of sewing lines of ventilation drawstrings 40 are arranged on the airbag fabric sheet 20, and the corresponding plurality of ventilation drawstrings 40 can be sewn on the corresponding sewing lines of the ventilation drawstrings 40, and the plurality of ventilation drawstrings 40 can be sewn on the airbag fabric sheet 20. After the airbag fabric sheet 20 is folded and sewn, the plurality of ventilation drawstrings 40 can divide the inner cavity of the airbag body into a plurality of interconnected cavities, and the sizes of the interconnected cavities can be the same or different.

[0093] like Fig.15 As shown, ventilation holes 401 are provided on the plurality of drawstrings 40, and the ventilation holes 401 can be evenly distributed on the ventilation drawstrings 40, or unevenly provided on the ventilation drawstrings 40. In the embodiment of the present application, there is no specific limitation on the number of the ventilation drawstrings 40, the number of ventilation holes 401 on the ventilation drawstrings, and the size of the ventilation holes 401, as long as the working requirements are met.

[0094] The knee airbag further includes an external drawstring 50 , a first end 501 of which is fixed to the airbag fabric 20 , and a second end 502 of which is fixed to a gas generator 60 , which is disposed inside the airbag body 10 .

[0095] Specifically, Figure 1 As shown, the gas generator 60 is disposed inside the airbag body 10. When the sensor detects that the vehicle has collided, the gas generator 60 generates and outputs gas, and the gas enters the inner cavity of the airbag body 10 for inflation, so that the airbag body 10 expands and deploys. Figure 10-11 and Fig.14 As shown, the external drawstring 50 is used to connect the airbag fabric piece 20 to the gas generator 60. A first fixing structure is provided on the first end 501 of the external drawstring, and the first end 501 of the external drawstring can be fixed to the airbag fabric piece 20 through the first fixing structure, that is, the first end 501 of the drawstring is fixed to the side opposite to the first side, and a second fixing structure fixed to the first fixing structure is provided on the side opposite to the first side. By fixing the first fixing structure to the second fixing structure, the first end 501 of the external drawstring is fixed to the airbag fabric piece 20. The first fixing structure and the second fixing structure can be mutually clamping rings, or the first fixing structure can be directly sewn to the second fixing structure. No matter which fixing structure is used, it is only necessary to fix the first end 501 of the external drawstring to the airbag fabric piece 20.

[0096] The second end 502 of the external pull strap is provided with a fixing hole, and the second end 502 of the external pull strap is fixed to the gas generator 60 by fixing the fixing hole to the gas generator 60 , that is, by sleeved the fixing hole on the stud of the gas generator.

[0097] like Figure 1 As shown, the knee airbag is mounted on a housing 80, and the housing 80 can be connected to the vehicle body bracket to achieve the fixation of the knee airbag. In addition, the knee airbag is provided with a cover 90, and the cover 90 is fixedly connected to the housing 80 by snapping or fasteners. The gas generator 70 disposed inside the knee airbag, when a signal triggers the gas generator 70, generates a large amount of gas to fill the knee airbag, and at the same time the airbag body 10 swells and pushes the cover 90 to open, so as to achieve an L-shaped structure, and the knee airbag is closer to the dashboard.

[0098] It should be noted that the second end 502 of the external tie strap can pass through the shell 80 and be fixed on the stud of the gas generator, or it can avoid the shell 80, that is, the second end 502 of the external tie strap does not pass through the shell 80 and is directly fixed on the stud of the gas generator. The second end 502 of the external tie strap is fixed to the gas generator 60 to prevent the airbag body 10 from shaking when the knee airbag is inflated.

[0099] In the embodiments of the present application, Figure 10-11 As shown, there are two external draw straps 50, and the first ends 501 of the two external draw straps are respectively fixed to the second fixing structures of the corresponding airbag fabric pieces. When the airbag fabric pieces are folded and installed between the shell 80 and the cover 90, the external draw straps 50 can be fixed on the studs of the gas generator in a cross or parallel manner.

[0100] A plurality of ear pieces 203 are arranged on the edge of the airbag fabric piece 20. When the airbag fabric piece 20 is folded, overlapping ear pieces 203 are present, and the overlapping ear pieces 203 are sewn together. When the knee airbag is inflated, the sewn ear pieces 203 cause the portion of the airbag body connected to the vehicle shell and the portion opposite thereto to be pulled mutually, so that the portion of the airbag body opposite to the occupant's knee is close to the dashboard 70 of the vehicle.

[0101] Specifically, Figure 8 , Figure 10-11As shown, a plurality of ear pieces 203 are arranged on the edge of the airbag fabric piece 20, and the positions of the ear pieces 203 arranged on the upper and lower edges of the airbag fabric piece 20 correspond to each other. After the airbag fabric piece 20 and the ventilation draw tape 40 are sewn together, they are folded and sewn along the center line N of the airbag fabric piece and the center line P of the convex structure. The ear pieces 203 on the same edge of the airbag fabric piece 20 are overlapped, and the ear pieces 203 on the same edge that overlap each other are sewn together as shown in FIG. Fig.11 When the knee airbag is inflated, the sewn ear piece 203 causes the portion of the airbag body connected to the vehicle shell and the portion opposite thereto to pull each other, so that the portion of the airbag body opposite to the passenger's knee is close to the vehicle dashboard 70, thereby enabling the knee airbag to better form an L-shaped structure. Figure 1 .

[0102] like Figure 1 As shown, the airbag fabric sheet 20 of the present application is provided with a pulling structure 201 and an outer convex structure 202, wherein the pulling structure 201 is located on the side of the knee airbag close to the instrument panel 70, and the outer convex structure 202 is located on the side of the knee airbag far from the instrument panel 70. When the airbag body 10 is deployed, the pulling structure 201 on the airbag fabric sheet will pull the partial areas on both sides of it to each other, so that the part of the airbag body opposite to the occupant's knee is closer to the vehicle's instrument panel 70. At the same time, during the deployment of the airbag body 10, the gas in the inner cavity of the airbag body generates a force at the outer convex structure, and the reaction force of the force will cause the tail of the airbag body to tilt toward the instrument panel 70 and away from the occupant's knee, so that the airbag body can better present an L-shaped structure, which can not only prevent the knee and calf from directly hitting the instrument panel 70, but also prevent the excessive air pressure in its inner cavity from impacting the knee and calf.

[0103] The present application also provides a vehicle, which includes the above-mentioned knee airbag, as follows.

[0104] An embodiment of the present application also provides a vehicle, which includes the above-mentioned knee airbag, and the knee airbag includes: an airbag body, which is formed by folding and sewing an airbag cloth piece, and a pulling structure is provided on the airbag cloth piece, and the pulling structure is formed by sewing a partial area on the airbag cloth piece by sewing thread; when the airbag body is deployed, the pulling structure pulls the two side parts of the airbag cloth piece located on the pulling structure to each other, so that the part of the airbag body opposite to the occupant's knee is close to the dashboard of the vehicle, and the pulling structure is located on the side of the knee airbag close to the dashboard.

[0105] The specific implementation of the knee airbag in this embodiment is similar to that of the knee airbag in the above embodiment. Please refer to the relevant contents of the above embodiment for details, and no unnecessary details will be given here.

[0106] It should be noted that, although several structures, components or units for realizing related functions are mentioned in the above detailed description, such division is not mandatory. In fact, according to the specific implementation of the present application, the features and functions of two or more structures, components or units described above can be concretized in one structure, component or unit. Conversely, the features and functions of one structure, component or unit described above can be further divided into multiple components, structures or units to be concretized.

[0107] In addition, although the components and the installation methods of the components or devices in the present application are described in a specific order in the drawings, this does not require or imply that the components or devices must be designed according to the specific components or the installation methods of the components, or that all the components shown must be included to achieve the desired results. Additionally or alternatively, some components can be omitted, multiple components can be combined into one component to achieve corresponding functions, and / or one component can be decomposed into multiple components to achieve corresponding functions, etc.

[0108] Although the present application is disclosed as above in the form of a preferred embodiment, it is not intended to limit the present application. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined by the claims of the present application.

Claims

1. A knee airbag, characterized in that: include: An airbag body, wherein the airbag body is formed by folding and sewing an airbag cloth sheet, wherein a pulling structure is provided on the airbag cloth sheet, and wherein the pulling structure is formed by sewing a part of the airbag cloth sheet with sewing thread; When the airbag body is deployed, the pulling structure pulls the two side portions of the airbag fabric sheet located on the pulling structure to each other, so that the portion of the airbag body opposite to the passenger's knee is close to the dashboard of the vehicle, and the pulling structure is located on the side of the knee airbag close to the dashboard; The airbag fabric piece is also provided with an outward convex structure, and the outward convex structure is formed by sewing a part of the area on the airbag fabric piece with sewing thread; When the airbag body is deployed, the outwardly protruding structure makes the part of the airbag body opposite to the passenger's knees close to the dashboard of the vehicle, and the outwardly protruding structure is located on a side of the knee safety airbag away from the dashboard.

2. The knee airbag according to claim 1, characterized in that: The air bag fabric sheet is a one-piece structure; Alternatively, the airbag fabric piece is formed by sewing a plurality of fabric pieces.

3. The knee airbag according to claim 1, characterized in that: The air bag fabric sheet is provided with openings, and the openings are sewn to form the pulling structure; The opening is an elliptical structure, and two sides of the longitudinal axis of the elliptical structure are sewing areas.

4. The knee airbag according to claim 2, characterized in that: When the airbag fabric piece is formed by sewing multiple fabric pieces, the airbag fabric piece includes a first fabric piece and a second fabric piece, a first side edge of the first fabric piece and a second side edge of the second fabric piece are both concave structures, the first side edge and the second side edge are sewn, and the edges of the two concave structures after sewing form the pulling structure.

5. The knee airbag according to claim 4, characterized in that: It also includes a third cloth piece, wherein the third side edge of the second cloth piece and the fourth side edge of the third cloth piece are both convex structures, the third side edge and the fourth side edge are sewn together, and the two convex structures after sewing form the outer convex structure; The convex structure is located in the middle of the second cloth piece and the third cloth piece, and the upper and lower ends of the convex structure gradually retract into the inside of the second cloth piece and the third cloth piece to form a smooth convex structure.

6. The knee airbag according to claim 1, characterized in that: The airbag fabric is also provided with a shrinkage structure, which is formed by sewing a partial area on the airbag fabric by sewing thread. The shrinkage structure is used to cooperate with the convex structure so that the part of the airbag body opposite to the occupant's knees is close to the dashboard of the vehicle. When the airbag body is deployed, the distance between the shrinkage structure and the convex structure is less than a preset value.

7. The knee airbag according to claim 1, characterized in that: It also includes a plurality of ventilation straps, which are distributed at intervals and fixed on the airbag fabric sheet, and the plurality of ventilation straps divide the inner cavity of the airbag body into a plurality of interconnected cavities, and the plurality of ventilation straps are provided with ventilation holes.

8. The knee airbag according to claim 1, characterized in that: It also includes an external drawstring, a first end of which is fixed to the airbag fabric sheet, and a second end of which is fixed to a gas generator, which is arranged inside the airbag body.

9. The knee airbag according to claim 1, characterized in that: A plurality of ear pieces are arranged on the edge of the airbag cloth piece, and overlapping ear pieces are present when the airbag cloth piece is folded, and the overlapping ear pieces are sewn together. When the knee airbag is inflated, the sewn ear pieces cause a portion of the airbag body connected to the vehicle shell and a portion opposite thereto to be mutually entangled, so that a portion of the airbag body opposite to the occupant's knee is close to the dashboard of the vehicle.

10. A vehicle, characterized in that: Comprising the knee airbag as described in claims 1-9.

Images