Knee safety air bag and vehicle

Abstract

The utility model 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 technical field of vehicle safety, in particular to a knee airbag, and also relates to a vehicle. BACKGROUND

[0002] The knee airbag (KAB) is one of the important components of the passive safety system of a vehicle, and is usually installed under the instrument panel of the vehicle and close to the driver or passenger. When the sensor detects a collision of the vehicle, the knee airbag will rapidly inflate and expand to form a buffer zone to absorb energy and prevent the driver's or passenger's knees and lower legs from directly impacting the hard structure inside the vehicle.

[0003] When the vehicle collides, the knee airbag rapidly expands to protect the driver's or passenger's knees and lower legs. Therefore, during the inflation and expansion of the knee airbag, it is necessary to make the expanded knee airbag closer to the direction of the instrument panel of the vehicle. In this way, during the expansion of the knee airbag, on the one hand, it can avoid the driver's or passenger's knees and lower legs from directly impacting the structure inside the vehicle; on the other hand, during the instant expansion of the knee airbag, it can also avoid the impact of the excessive air pressure in the inner cavity of the knee airbag to the driver's or passenger's knees and lower legs.

[0004] Therefore, there is an urgent need for a knee airbag that can be closer to the instrument panel during expansion, so as to better protect the knees and lower legs. CONTENT OF THE INVENTION

[0005] The present application provides a knee airbag to solve the problem of how to make the expanded knee airbag closer to the instrument panel of the vehicle during an accident, so as to better protect the knees and lower legs. The present application also provides a vehicle using the above-mentioned knee airbag.

[0006] The present application provides a knee airbag, comprising: an airbag body, the airbag body is folded and sewn by an airbag cloth, a pulling structure is arranged on the airbag cloth, and the pulling structure is formed by sewing part of the area on the airbag cloth with sewing thread.

[0007] When the airbag body is expanded, the pulling structure pulls the two sides of the airbag cloth located on the pulling structure to make the part of the airbag body opposite to the knees of the occupant closer to the instrument panel of the vehicle, and the pulling structure is located on the side of the knee airbag close to the instrument panel; an outward convex structure is also arranged on the airbag cloth, and the outward convex structure is formed by sewing part of the area on the airbag cloth with sewing thread.

[0008] The outer convex structure is located on the side of the knee safety airbag away from the dashboard of the vehicle.

[0009] Optionally, the airbag cloth piece is a one-piece structure.

[0010] Alternatively, the airbag cloth piece is formed by sewing multiple cloth pieces.

[0011] Optionally, the airbag cloth piece is provided with an opening, and the opening is sewn to form the pulling structure.

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

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

[0015] The convex structure is located at the middle position of the second cloth piece and the third cloth piece, the upper and lower ends of the convex structure gradually retract inward to the interior of the second cloth piece and the third cloth piece, and form a smooth convex structure.

[0016] Optionally, the airbag cloth piece is further provided with a contraction structure, the contraction structure is formed by sewing part of the area on the airbag cloth piece with sewing thread, and the contraction structure is used to cooperate with the outer convex structure to make the part of the airbag body opposite to the knee of the occupant close to the dashboard of the vehicle. When the airbag body is deployed, the distance between the contraction structure and the outer convex structure is less than a preset value.

[0017] Optionally, a plurality of air passage pull tapes are further included, the plurality of air passage pull tapes are spaced apart and fixed on the airbag cloth piece, the plurality of air passage pull tapes divide the inner cavity of the airbag body into a plurality of interconnected cavities, and the plurality of air passage pull tapes are provided with air holes.

[0018] Optionally, an external pull tape is further included, a first end of the external pull tape is fixed on the airbag cloth piece, a second end of the external pull tape is fixed on a gas generator, and the gas generator is arranged inside the airbag body.

[0019] Optionally, the edge of the airbag cloth is provided with a plurality of ears, the airbag cloth is folded to have the ears stacked, and the ears are sewn to each other, when the knee airbag inflates, the sewn ears pull the part of the airbag body connected with the housing of the vehicle and the part opposite to it to each other, so that the part of the airbag body opposite to the knee of the occupant is close to the dashboard of the vehicle.

[0020] The application also provides a vehicle comprising the knee airbag of any one of the above.

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

[0022] The application provides a knee airbag, comprising: an airbag body, the airbag body is folded and sewn by an airbag cloth, the airbag cloth is provided with a pulling structure, the pulling structure is formed by sewing the part of the airbag cloth by sewing thread; when the airbag body is unfolded, the pulling structure pulls the parts on both sides of the airbag cloth to each other, so that the part of the airbag body opposite to the knee of the occupant is close to the dashboard of the vehicle, the pulling structure is located on the side of the knee airbag close to the dashboard; the airbag cloth is also provided with a convex structure, the convex structure is formed by sewing the part of the airbag cloth by sewing thread; when the airbag body is unfolded, the convex structure makes the part of the airbag body opposite to the knee of the occupant close to the dashboard of the vehicle, and the convex structure is located on the side of the knee airbag away from the dashboard.

[0023] The application provides a knee airbag, comprising: an airbag body, the airbag body is folded and sewn by an airbag cloth, the airbag cloth is provided with a pulling structure, the pulling structure is formed by sewing the part of the airbag cloth by sewing thread; when the airbag body is unfolded, the pulling structure pulls the parts on both sides of the airbag cloth to each other, so that the part of the airbag body opposite to the knee of the occupant is close to the dashboard of the vehicle, the pulling structure is located on the side of the knee airbag close to the dashboard; the airbag cloth is also provided with a convex structure, the convex structure is formed by sewing the part of the airbag cloth by sewing thread; when the airbag body is unfolded, the convex structure makes the part of the airbag body opposite to the knee of the occupant close to the dashboard of the vehicle, and the convex structure is located on the side of the knee airbag away from the dashboard.

[0024] The edge of the airbag cloth is provided with a plurality of ears, the airbag cloth is folded to have the ears stacked, and the ears are sewn to each other. When the knee airbag is inflated, the sewn ears pull the part of the airbag body connected to the housing of the vehicle and the opposite part of the airbag body to each other, that is, the front part and the rear part of the airbag body are pulled to each other, so that the part of the airbag body opposite to the knee of the occupant is close to the instrument panel of the vehicle, and the airbag body can better present an L-shaped structure, and the knee and the lower leg of the occupant can be better protected. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic diagram of a knee airbag provided by an embodiment of the present application.

[0026] Figure 2 FIG. 2 is a structural schematic diagram of a one-piece airbag cloth, and the sewing traces and the closure line on the airbag cloth are not sewn.

[0027] Figure 3 FIG. 3 is a structural schematic diagram of a one-piece airbag cloth, and the sewing traces on the airbag cloth are sewn (that is, a pulling structure) and the closure line is sewn (that is, an outward convex structure).

[0028] Figure 4 FIG. 4 is a structural schematic diagram of a one-piece airbag cloth, and the sewing traces on the airbag cloth are sewn (that is, a pulling structure) and the closure line is sewn (that is, an outward convex structure), and the airbag cloth is folded along the center line P of the outward convex structure.

[0029] Figure 5 FIG. 5 is a structural schematic diagram of an airbag cloth composed of two pieces of cloth, and the first piece of cloth is provided with an opening structure, and the second piece of cloth is provided with a closure line.

[0030] Figure 6 FIG. 6 is a structural schematic diagram of the first piece of cloth after the opening structure is sewn (that is, a pulling structure).

[0031] Figure 7 FIG. 7 is a structural schematic diagram of the second piece of cloth after the closure line is sewn (that is, an outward convex structure).

[0032] Figure 8 FIG. 8 is a structural schematic diagram of the second piece of cloth after the closure line is sewn and folded along the center line P of the outward convex structure.

[0033] Figure 9 FIG. 9 is a structural schematic diagram of an airbag cloth composed of three pieces of cloth, and the pieces of cloth are not sewn.

[0034] Figure 10 is a structure schematic diagram of the air bag cloth piece folding one provided by the embodiment of the present application.

[0035] Figure 11 is a structure schematic diagram of the air bag cloth piece folding two provided by the embodiment of the present application.

[0036] Figure 12 is a sectional view of the outer convex structure provided by the embodiment of the present application.

[0037] Figure 13 is a sectional view of the shrinkage structure provided by the embodiment of the present application.

[0038] Figure 14 is a structure schematic diagram of the external pull strap provided by the embodiment of the present application.

[0039] Figure 15 is a structure schematic diagram of the air pull strap provided by the embodiment of the present application.

[0040] Reference signs:

[0041] 10: air bag body;

[0042] 20: air bag cloth piece; 20-a: opening; 20-b: sewing track; 20-c: closing line; 20-d: shrinkage track;

[0043] 201: pulling structure; 202: outer convex structure; 203: ear piece; 204: shrinkage 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 cloth piece; 3031: fourth side edge;

[0047] 40: air pull strap; 401: air hole;

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

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

[0050] In the following description, a lot of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be practiced in many different ways from those described herein, and the skilled person can make similar extensions without departing from the spirit 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 "upper", "lower", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0052] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In the related art, when the vehicle has an accident, the knee airbag installed under the instrument panel rapidly expands 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 instrument panel, but also provides additional support and cushioning through the L-shaped structure, thereby minimizing the risk of injury. However, the current L-shaped knee airbag has the following problems in the process of expansion. On the one hand, the L-shaped structure of the knee airbag is not effective, and the L-shaped structure may be far away from the instrument panel, which cannot better protect the knees and calves of the occupant. On the other hand, the L-shaped structure is relatively close to the legs of the occupant, and the air pressure in the inner cavity of the L-shaped structure may impact the knees and calves during the expansion process, which may cause secondary injury to the occupant.

[0054] Therefore, in order to make the knee airbag better close to the instrument panel during the expansion process, and also to avoid the air pressure in the inner cavity of the knee airbag impacting the knees and calves, the present application provides a knee airbag, which comprises: an airbag body, the airbag body is folded and sewn by an airbag cloth, the airbag cloth is provided with a pulling structure, the pulling structure is formed by sewing part of the area on the airbag cloth by sewing thread; when the airbag body is expanded, the pulling structure pulls the two sides of the airbag cloth on the pulling structure to each other, so that the part of the airbag body opposite to the knees of the occupant is close to the instrument panel of the vehicle, and the pulling structure is located on one side of the knee airbag close to the instrument panel; the airbag cloth is also provided with an outward protruding structure, the outward protruding structure is formed by sewing part of the area on the airbag cloth by sewing thread; when the airbag body is expanded, the outward protruding structure makes the part of the airbag body opposite to the knees of the occupant close to the instrument panel of the vehicle, and the outward protruding structure is located on the side of the knee airbag away from the instrument panel.

[0055] It can be understood that the gas bag cloth piece is provided with a pulling structure and an outward protruding structure, the pulling structure is located on one side of the knee air bag close to the instrument panel, and the outward protruding structure is located on the side of the knee air bag away from the instrument panel. When the air bag body is unfolded, the pulling structure on the gas bag cloth piece pulls the partial areas on both sides of the gas bag cloth piece to each other, so that the part of the air bag body opposite to the knee of the occupant is closer to the instrument panel of the vehicle. At the same time, when the air bag body is unfolded, the gas in the inner cavity of the air bag body generates a force at the outward protruding structure, and the reaction force of the force makes the tail of the air bag body tilt towards the instrument panel and away from the knee of the occupant, so that the air bag body can better present an L-shaped structure. The L-shaped structure not only can block the knee and the lower leg from directly impacting the instrument panel, but also can avoid that the gas pressure in the inner cavity of the air bag body may impact the knee and the lower leg.

[0056] Next, the knee air bag provided by the present application will be described in detail in combination with the drawings.

[0057] The present application provides a knee air bag, as shown in the drawings, Figure 1 As shown in the drawings, the knee air bag (KAB) generally presents an L-shaped structure during unfolding process. The knee and the lower leg of the human body generally present a certain angle when in the driving position or the sitting position. The design of the L-shaped structure is more in line with this natural form, and can better wrap the leg during unfolding, so as to provide more close protection.

[0058] As shown in the drawings, Figure 1 and Figure 2 The knee air bag comprises an air bag body 10, and the air bag body 10 is folded and sewn by a gas bag cloth piece 20. It can be understood that the structure of the air bag body 10 can be formed by folding the gas bag cloth piece 20 and sewing the folded gas bag cloth piece 20.

[0059] As shown in the drawings, Figures 2-4 the gas bag cloth piece 20 is a one-piece structure; or, as shown in the drawings, Figure 5 and Figure 9 the gas bag cloth piece 20 is formed by sewing a plurality of cloth pieces 30. It can be understood that the gas bag cloth piece 20 can be a one-piece structure, or can be formed by sewing a plurality of cloth pieces such as two or three cloth pieces. According to the actual working condition, it can be selected whether the gas bag cloth piece 20 is a one-piece structure or is formed by sewing a plurality of cloth pieces 30. That is, the gas bag cloth piece is formed by sewing a whole cloth piece or a plurality of cloth pieces, and the gas bag cloth piece is folded and sewn to form the air bag body.

[0060] The airbag fabric 20 is generally made of nylon fabric or polyester fabric, etc. because of its high strength and durability, which can withstand the impact force generated when the vehicle collides. Figure 1 As shown, the gas generator 60 provided in the airbag body 10 generates a large amount of gas, such as nitrogen, when the vehicle collides, which causes the knee airbag to rapidly expand to form an L-shaped buffer zone, which can protect the knees and lower legs of the passengers or driver in the vehicle from being injured by colliding with 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. Of course, the gas generator can also be directly installed in the inner cavity of the airbag body, and when the gas generator generates and outputs gas, the gas enters the inner cavity of the airbag body to inflate, so that the airbag body rapidly expands and unfolds.

[0062] The airbag fabric 20 is provided with a pulling structure 201, which is formed by sewing part of the area on the airbag fabric with sewing thread. Specifically, as shown in Figure 1 、 Figures 3-4 and Figure 6 The airbag fabric 20 can be provided with the pulling structure 201, which is arranged on the airbag fabric 20 close to the fixed gas generator 60 and close to the instrument panel when the airbag body unfolds. That is, as shown in Figure 1 When the airbag body 10 unfolds, the end of the pulling structure 201 close to the gas generator 60, and the side of the pulling structure 201 close to the instrument panel 70.

[0063] As shown in Figure 1 The pulling structure 201 is arranged on the airbag body 10 during unfolding, close to the fixed gas generator 60 and close to the side of the instrument panel 70, the head of the knee airbag provided with the gas generator 60 is fixed on the vehicle body, that is, the head of the knee airbag is the fixed end, and the tail opposite to the head is the free end. The pulling force is generated on the left and right sides of the pulling structure 201, which causes the tail of the knee airbag to tilt towards the instrument panel, so that the knee airbag is closer to the instrument panel of the vehicle, and can better present an L-shaped structure, which can better protect the knees and lower legs of the passengers or driver.

[0064] As shown in Figure 1 and Figure 2As shown, the pulling structure 201 is a structure formed by sewing part of the air bag cloth with sewing thread. Specifically, the pulling structure 201 can be two pre-set sewing tracks 20-b on the air bag cloth close to the fixed gas generator 60 and close to the instrument panel 70. The two pre-set sewing tracks 20-b can be sewn, that is, the pulling structure 201 is formed in the sewing area. In the embodiment of the present application, as shown in the figure, Figure 2 As shown, the two sewing tracks 20-b can be two pre-set arcs on the air bag cloth 20, and the two arcs are symmetrically arranged on the air bag cloth 20. After the two arcs are sewn, the pulling structure 201 as shown in the figure is formed. Figure 3 Of course, the sewing track 20-b also does not exclude other structures, such as two straight lines, etc. Here, the two pre-set sewing tracks 20-b are not listed one by one.

[0065] In addition to the above, the two pre-set sewing tracks 20-b on the air bag cloth 20 can be directly pre-set, and the two pre-set sewing tracks 20-b can be sewn to form the pulling structure 201. As shown in the figure, Figure 5 As shown, the opening 20-a is sewn to form the pulling structure 201 as shown in the figure. Figure 6 It can be understood that the opening 20-a is arranged on the air bag cloth 20 close to the fixed gas generator and close to the instrument panel. Specifically, as shown in the figure, 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. The sewn opening 20-a forms the pulling structure 201 as shown in the figure. Figure 6 In the embodiment of the present application, the size and number of the opening 20-a are not limited specifically, as long as the industry demand is met.

[0066] The above two pulling structures 201 can be arranged on the air bag cloth of a one-piece structure, or on the air bag cloth formed by sewing a plurality of cloths 30. Of course, the structure of the air bag cloth 20 can be selected according to the specific working condition.

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

[0068] In addition to the two pulling structures 201 described above, there is another pulling structure 201, which is mainly provided on the air bag cloth piece 20 formed by stitching a plurality of cloth pieces 30. As shown in Figure 9 As shown, when the air bag cloth piece 20 is formed by stitching a plurality of cloth pieces 30, the air bag cloth piece 20 includes a first cloth piece 301 and a second cloth piece 302, the first side edge 3011 of the first cloth piece and the second side edge 3021 of the second cloth piece are both concave structures, and the first side edge 3011 and the second side edge 3021 are stitched, and the edges of the two stitched concave structures form the pulling structure 201.

[0069] Specifically, when the air bag cloth piece is formed by stitching a plurality of cloth pieces 30. As shown in Figure 9 As shown, the air bag cloth piece includes a first cloth piece 301 and a second cloth piece 302, the first side edge 3011 of the first cloth piece and the second side edge 3021 of the second cloth piece are both provided as concave structures, and the sizes, shapes, etc. of the two concave structures are the same, so that when the first side edge 3011 and the second side edge 3021 are stitched, the first side edge 3011 and the second side edge 3021 can be better fitted to facilitate the stitching of the two side edges, and at the same time, when the air bag body is unfolded, the gas can flow better.

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

[0071] It should be noted that no matter which way the pulling structure is formed, the position and function of the pulling structure are the same.

[0072] As shown in Figure 1As shown, the pulling structure 201 is mainly used to pull the two sides of the air bag cloth 20 in the knee airbag close to the instrument panel 70 of the vehicle when the air bag body 10 is deployed, and the pulling structure 201 is located on the side of the knee airbag close to the instrument panel 70.

[0073] Specifically, when the sensor detects that the vehicle has collided, the knee airbag installed on the instrument panel 70 will be quickly deployed. The head of the air bag body 10 is fixed on the vehicle body, and the tail opposite to the head is a free end. At this time, the two sides of the pulling structure 201 located on the side of the knee airbag close to the instrument panel 70 will pull each other. That is, when the knee airbag is deployed, the two sides of the pulling structure 201 pull each other, which will make the free end of the tail tilt towards the instrument panel 70, that is, the tail will move away from the legs of the passenger or the driver, so that the knee airbag can better present an L-shaped structure, which can avoid the knees or lower legs of the passenger or the driver from colliding with the vehicle, and at the same time, the tail moving away from the legs of the passenger or the driver can also avoid the pressure in the inner cavity of the tail from being too large, which may impact the knees or lower legs of the passenger or the driver.

[0074] It can be understood that, due to the position of the pulling structure 201 and the effect of the pulling structure 201 in the deployment process of the air bag body 10, that is, the pulling structure 201 is located on the side of the knee airbag close to the instrument panel 70, the two sides of the pulling structure 201 generate a pulling force of pulling each other when the air bag body 10 is deployed, which will further make the tail tilt towards the instrument panel 70. In the deployment process of the air bag body 10, under the condition that the head is fixed, the tail opposite to the head tilts towards the instrument panel 70, which can make the knee airbag better present an L-shaped structure.

[0075] In addition to the above-mentioned pulling structure 201 provided on the air bag cloth, as shown in Figure 1 , Figures 3-4 , Figures 7-8 , Figure 10 and Figure 12 , the air bag cloth 20 is also provided with an outward protruding structure 202, which is formed by sewing part of the area on the air bag cloth with sewing thread; as shown in Figure 1 , when the air bag body 10 is deployed, the outward protruding structure 202 makes the part of the air bag body 10 opposite to the knees of the passenger close to the instrument panel 70 of the vehicle, and the outward protruding structure 202 is located on the side of the knee airbag away from the instrument panel. It should be noted that, as shown in Figure 12The diagram shown is a cross-sectional view of the protruding structure 202 provided on a one-piece structure or on two sewn-together airbag fabric pieces. Figure 12 A cross-sectional view of the upper convex structure shows that the convex structure is formed by sewing a portion of the air bag fabric piece together with a sewing thread.

[0076] like Figure 1 As shown, in addition to the traction structure 201, the airbag fabric also has a protruding structure 202. When the airbag body 10 deploys, the protruding structure 202 is positioned opposite to the traction structure 201. This can be understood as follows: when the airbag body 10 deploys, if the traction structure 201 is closer to the instrument panel 70, then the protruding structure 202 is further away from the instrument panel 70, i.e., closer to the legs of the occupant or driver.

[0077] like Figure 3 As shown, when the air bag fabric 20 is a one-piece structure and is not folded or sewn, the traction structure 201 is located on the side of the air bag fabric 20 close to the side where the gas generator is fixed, and the outwardly protruding structure 202 is opposite to the traction structure 201, so the outwardly protruding structure 202 is located on the side of the air bag fabric 20 away from the side where the gas generator is fixed. Figure 1 As shown, after the airbag fabric piece 20 is folded and sewn, when the airbag body 10 is deployed, the traction structure 201 is on the side closer to the instrument panel 70, and the protruding structure 202 is on the side away from the instrument panel 70, that is, the protruding structure 202 is closer to the legs of the occupant or driver.

[0078] like Figure 1 As shown, the protruding structure 202 is formed by sewing a portion of the airbag fabric 20 together with sewing thread. When the airbag body 10 deploys, the gas inside the airbag body 10 rushes towards the protruding structure 202, causing the protruding structure 202 to protrude outwards from the airbag body 10, that is, towards the legs of the occupant or driver. At this time, a force is generated at the protruding structure 202, and the reaction force at this point causes the rear end to move away from the occupant's or driver's legs, even tilting the rear end towards the dashboard 70, so that the knee airbag better presents an L-shaped structure.

[0079] When the air bag fabric 20 is formed by sewing together multiple fabric pieces 30, the tension structure 201 is formed by sewing together the first side 3011 and the second side 3021. The formation process of the convex structure 202 will be described in detail below.

[0080] like Figure 9As shown, the air bag cloth piece 20 further comprises a third cloth piece 303, the third side edge 3022 of the second cloth piece and the fourth side edge 3031 of the third cloth piece are both convex structures, the third side edge 3022 and the fourth side edge 3031 are sewn, and the two sewn convex structures form the outer convex structure; the convex structure is located at the middle position of the second cloth piece 302 and the third cloth piece 303. It should be noted that the middle position of the second cloth piece 302 and the middle position of the third cloth piece 303 are the parts of the third side edge 3022 and the fourth side edge 3031 that protrude towards each other, and the upper and lower ends of the convex structure gradually recede towards the inside of the second cloth piece 302 and the third cloth piece 303, and form a smooth convex structure.

[0081] Specifically, when the air bag cloth piece 20 is sewn by a plurality of cloth pieces 30, as shown in the following figure, Figure 9 As shown, the air bag cloth piece 20 can be sewn by three cloth pieces 30, that is, the air bag cloth piece 20 comprises a first cloth piece 301, a second cloth piece 302 and a third cloth piece 303, the first side edge 3011 of the first cloth piece and the second side edge 3021 of the second cloth piece are sewn, and the first side edge 3011 and the second side edge 3021 form the pulling structure. The third side edge 3022 on the second cloth 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 cloth piece 302. The fourth side edge 3031 is a side edge on the third cloth piece 302, and the third side edge 3022 and the fourth side edge 3031 are sewn, that is, the third side edge 3022 and the fourth side edge 3031 are both provided as convex structures.

[0082] The convex structure is located at the middle position 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 recedes towards the inside of the second cloth piece 302 and the third cloth piece 303 from the upper and lower ends of the third side edge 3022 and the fourth side edge 3031. It can be understood that the end of the third side edge 3022 and the fourth side edge 3031 recedes towards the inside of the corresponding cloth piece, and the middle position of the cloth piece protrudes outwardly towards the opposite cloth piece, so that a smooth convex structure can be formed.

[0083] After the convex structure of the third side edge 3022 and the convex structure of the fourth side edge 3031 are sewn, the sewn third side edge 3022 and the fourth side edge 3031 partially overlap, and the upper and lower ends of the non-overlapping area of the third side edge 3022 and the fourth side edge 3031 form a triangular structure, and the symmetrical edges of the triangular structure are sewn on the other symmetrical edges to form an outer convex structure.

[0084] The above is the convex structure provided on the air bag fabric sewn by three pieces of fabric, of course, the convex structure can also be provided on the air bag fabric sewn by two pieces of fabric, and the sewing line is the side provided with convex structure.

[0085] Of course, the convex structure 202 can also be provided on the air bag fabric 20 of one-piece structure, or the air bag fabric 20 is sewn by a plurality of fabrics 30, but the sewing line is not the side provided with convex structure. At this time, as shown in Figure 2 and Figure 5 The convex structure is provided on the upper and lower ends away from the fixed gas generator fabric, and symmetric closed lines 20-c are provided on the upper and lower ends respectively, which extend to the inside of the air bag fabric, so that the distance between the symmetric closed lines 20-c is reduced until the symmetric closed lines 20-c intersect, and one closed line 20-c is folded along the symmetric axis to the other closed line 20-c and sewn, as shown in Figure 3 、 Figure 4 、 Figures 7-8 and Figure 12 to form the convex structure 202. It should be noted that in the embodiments of the present application, the number of convex structures is not specifically limited, and a proper number of convex structures can be provided according to specific conditions.

[0086] In the embodiments of the present application, when the air bag fabric 20 is formed by sewing two pieces of fabric, as shown in Figure 5 The opening structure 20-a is provided on the fabric provided with the fixed gas generator, and the opening structure 20-a is sewn to form the pulling structure 201 as shown in Figure 6 The closed line 20-c is provided on the other fabric, and the closed line 20-c is sewn to form the convex structure 202 as shown in Figure 7 The circumference of the fabric provided with the opening structure 20-a is L1, the circumference of the fabric provided with the closed line 20-c is L2, at this time L2>L1, after the closed line 20-c is sewn, the circumference of the fabric of the convex structure 202 formed after sewing is L3 as shown in Figure 7 At this time, L3=L1, at this time, the two fabrics can be sewn.

[0087] The air bag fabric is also provided with a contraction structure 204, which is formed by sewing part of the area on the air bag fabric by sewing thread, as shown in Figure 2 The contraction track 20-d is pre-set on the fabric, and the sewing thread is sewn along the contraction track 20-d to form Figure 3 or Figure 13The contraction structure 204 is used to cooperate with the convex structure 202, so that the part of the airbag body opposite to the knee of the passenger is close to the dashboard of the vehicle, and the distance between the contraction structure and the convex structure is less than a preset value when the airbag body is unfolded.

[0088] As shown in Figure 3 The contraction structure 204 is arranged on the airbag cloth in addition to the traction structure 201 and the convex structure 202, and is located on the side close to the convex structure 202 and away from the traction structure 201, so that the distance between the contraction structure and the convex structure is less than a preset value when the airbag body is unfolded. The preset value can be determined according to the specific working condition. It can be understood that, if the airbag cloth is formed by sewing a plurality of cloth pieces, the contraction structure can be arranged on the second cloth piece or the third cloth piece and close to the convex structure.

[0089] As shown in Figure 13 The contraction structure 204 is formed by sewing the part of the airbag cloth along the contraction track by sewing thread, which can reduce the volume of the two sides and make the volume of the center of the opposite contraction structure and the opposite convex structure better inflated. When the airbag body is unfolded, the contraction structure can cooperate with the convex structure to make the part of the airbag body opposite to the knee of the passenger 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 contraction structure can be determined according to the specific working condition. In the embodiment of the present application, the number of the contraction structure is two, and the two contraction structures are distributed near the two convex structures, so as to cooperate with the convex structure to make the part of the airbag body opposite to the knee of the passenger close to the dashboard of the vehicle, which can make the airbag body better present the L-shaped structure.

[0091] As shown in Figure 15 The knee airbag further comprises a plurality of air passage pull belts 40, which are distributed and fixed on the airbag cloth, and the plurality of air passage pull belts 40 divide the inner cavity of the airbag body into a plurality of cavities connected with each other. Figure 1 The plurality of air passage pull belts 40 are provided with air holes.

[0092] Specifically, as shown in Figure 10As shown in the drawings, a plurality of air ventilation pull tapes 40 are provided on the air bag cloth sheet 20, and the corresponding plurality of air ventilation pull tapes 40 can be sewn on the sewing lines of the corresponding air ventilation pull tapes 40. When the air bag cloth sheet 20 is folded and sewn, the plurality of air ventilation pull tapes 40 can divide the inner cavity of the air bag body into a plurality of interconnected cavities, and the sizes of the interconnected cavities can be the same or different.

[0093] As shown in the drawings, Figure 15 As shown in the drawings, air holes 401 are provided on the plurality of pull tapes 40, which can be uniformly distributed on the air ventilation pull tapes 40 or unevenly arranged on the air ventilation pull tapes 40. In the embodiments of the present application, the number of air ventilation pull tapes 40, the number of air holes 401 on the air ventilation pull tapes, and the size of the air holes 401 are not specifically limited, as long as they meet the working needs.

[0094] The knee safety air bag further comprises an external pull tape 50, a first end 501 of the external pull tape is fixed on the air bag cloth sheet 20, and a second end 502 of the external pull tape is fixed on a gas generator 60, and the gas generator 60 is arranged inside the air bag body 10.

[0095] Specifically, as shown in the drawings, Figure 1 The gas generator 60 is arranged inside the air bag 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 air bag body 10 to inflate, so that the safety air bag body 10 expands and unfolds. As shown in the drawings, Figures 10-11 and Figure 14 The external pull tape 50 connects the air bag cloth sheet 20 to the gas generator 60. The first end 501 of the external pull tape is provided with a first fixing structure, and the first end 501 of the external pull tape can be fixed on the air bag cloth sheet 20 through the first fixing structure, that is, the first end 501 of the pull tape is fixed on the side opposite to the first side, and the second fixing structure is arranged on the side opposite to the first side, and the first fixing structure is fixed on the second fixing structure, that is, the first end 501 of the external pull tape is fixed on the air bag cloth sheet 20. The first fixing structure and the second fixing structure can be clamping rings that are clamped with each other, or the first fixing structure can be directly sewn on the second fixing structure. No matter which fixing structure is used, as long as the first end 501 of the external pull tape is fixed on the air bag cloth sheet 20.

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

[0097] As shown in Figure 1 , the knee airbag is installed on the shell 80, and the knee airbag is fixed by connecting the shell 80 with the body support of the vehicle. Moreover, the knee airbag is provided with a cover 90, and the cover 90 is fixedly connected with the shell 80 by clamping or fasteners. The gas generator 70 arranged in the knee airbag generates a large amount of gas to fill the knee airbag when a signal is triggered, and at the same time, the airbag body 10 is inflated and pushes the cover 90 to open, so as to achieve an L-shaped structure, and the knee airbag is closer to the instrument panel.

[0098] It should be noted that the second end 502 of the external pull strap can pass through the shell 80 and be fixed on the stud of the gas generator, or can avoid the shell 80, that is, the second end 502 of the external pull 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 pull strap is fixed on the gas generator 60 to prevent the airbag body 10 from shaking when the knee airbag is inflated.

[0099] In the embodiment of the present application, as shown in Figures 10-11 , the number of the external pull straps 50 is two, and the first end 501 of each of the two external pull straps is fixed on the second fixing structure of the corresponding airbag cloth piece. When the airbag cloth piece is folded and installed between the shell 80 and the cover 90, the external pull straps 50 can be fixed on the stud of the gas generator in a cross or parallel manner.

[0100] The edge of the airbag cloth piece 20 is provided with a plurality of tabs 203. After the airbag cloth piece 20 is folded, the tabs 203 are overlapped, and the overlapped tabs 203 are sewn. When the knee airbag is inflated, the sewn tabs 203 pull the part of the airbag body connected with the shell of the vehicle and the opposite part of the airbag body, so that the part of the airbag body opposite to the knee of the occupant is close to the instrument panel 70 of the vehicle.

[0101] Specifically, as shown in Figure 8 , Figures 10-11As shown, multiple ear tabs 203 are provided on the edge of the air bag fabric piece 20, and the ear tabs 203 provided on the upper and lower edges of the air bag fabric piece 20 are positioned correspondingly. After the air bag fabric piece 20 and the ventilation strap 40 are sewn together, and folded and sewn along the center line N of the air bag fabric piece and the center line P of the outward convex structure, the ear tabs 203 on the same edge of the air bag fabric piece 20 will overlap, and the overlapping ear tabs 203 on the same edge are sewn together as shown. Figure 11 When the knee airbag inflates, the sewn-in ear flaps 203 cause the portion of the airbag body connected to the vehicle shell and its opposite portion to pull against each other, so that the portion of the airbag body opposite the occupant's knee is closer to the vehicle's dashboard 70, thereby allowing the knee airbag to better form an L-shaped structure. Figure 1 .

[0102] like Figure 1 As shown, the airbag fabric 20 of this application is provided with a pulling structure 201 and a protruding structure 202. The pulling structure 201 is located on the side of the knee airbag closer to the dashboard 70, and the protruding structure 202 is located on the side of the knee airbag away from the dashboard 70. When the airbag body 10 deploys, the pulling structure 201 on the airbag fabric will pull some areas on both sides of the airbag body together, so that the part of the airbag body opposite to the occupant's knee is closer to the vehicle's dashboard 70. At the same time, during the deployment of the airbag body 10, the gas in the airbag body cavity generates a force at the protruding structure. The reaction force of this force will cause the tail of the airbag body to tilt towards the dashboard 70 and away from the occupant's knee, so that the airbag body can better present an L-shaped structure. This L-shaped structure can not only prevent the knee and lower leg from directly impacting the dashboard 70, but also prevent excessive air pressure in its cavity from impacting the knee and lower leg.

[0103] This application also provides a vehicle that includes the aforementioned knee airbag, as detailed below.

[0104] This application embodiment also provides a vehicle including the above-mentioned knee airbag. The knee airbag includes: an airbag body, which is formed by folding and sewing an airbag fabric piece. The airbag fabric piece is provided with a traction structure, which is formed by sewing a portion of the airbag fabric piece together with sewing thread. When the airbag body is deployed, the traction structure pulls the two sides of the airbag fabric piece located on the traction structure together, so that the portion of the airbag body opposite to the occupant's knee is close to the vehicle's dashboard. The traction 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 analogous to the knee airbag in the above-described embodiments, and specific details can be found in the above-described embodiments, which are not repeated here.

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

[0107] In addition, although the various components of the assembly or device and the installation mode between components in the present application are described in a specific order in the accompanying drawings, this does not require or imply that the assembly or device must be designed in this specific component or installation mode between components, or must contain all the components shown to achieve the desired results. In addition or alternatively, some components can be omitted, a plurality of components can be combined into one component to achieve the corresponding function, and / or one component can be divided into a plurality of components to achieve the corresponding function, etc.

[0108] Although the present application is disclosed with the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application, therefore the protection scope of the present application should be defined by the scope defined in the claims of the present application.

Claims

1. A knee airbag, characterized in that, The application relates to a knee airbag, which comprises: an airbag body, which is folded and sewn by an airbag cloth sheet, wherein a pulling structure is arranged on the airbag cloth sheet, and the pulling structure is formed by sewing some areas on the airbag cloth sheet by sewing thread; when the airbag body is unfolded, the pulling structure pulls the two sides of the airbag cloth sheet to make the part of the airbag body, which is opposite to the knee of a passenger, close to the instrument panel of a vehicle, and the pulling structure is located on the side of the knee airbag, which is close to the instrument panel; an outward convex structure is arranged on the airbag cloth sheet, and the outward convex structure is formed by sewing some areas on the airbag cloth sheet by sewing thread; when the airbag body is unfolded, the outward convex structure makes the part of the airbag body, which is opposite to the knee of a passenger, close to the instrument panel of a vehicle, and the outward convex structure is located on the side of the knee airbag, which is far away from the instrument panel.

2. The knee airbag according to claim 1, characterized by The airbag cloth sheet is a one-piece structure; alternatively, the airbag cloth sheet is formed by sewing a plurality of cloth sheets.

3. The knee airbag according to claim 1, characterized by, An opening is arranged on the airbag cloth sheet, and the opening is sewn to form the pulling structure; the opening is an elliptical structure, and the two sides of the longitudinal axis of the elliptical structure are sewing areas.

4. The knee airbag according to claim 2, characterized by When the airbag cloth sheet is formed by sewing a plurality of cloth sheets, the airbag cloth sheet comprises a first cloth sheet and a second cloth sheet, the first side edge of the first cloth sheet and the second side edge of the second cloth sheet 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, a third cloth sheet is further included, the third side edge of the second cloth sheet and the fourth side edge of the third cloth sheet are both convex structures, the third side edge and the fourth side edge are sewn, and the two convex structures after sewing form the outward convex structure; the convex structure is located at the middle position of the second cloth sheet and the third cloth sheet, the upper and lower ends of the convex structure gradually recess towards the inside of the second cloth sheet and the third cloth sheet, and the convex structure is smooth.

6. The knee airbag according to claim 1, characterized by a contraction structure is further arranged on the airbag cloth sheet, the contraction structure is formed by sewing some areas on the airbag cloth sheet by sewing thread, the contraction structure is used for cooperating with the outward convex structure to make the part of the airbag body, which is opposite to the knee of a passenger, close to the instrument panel of a vehicle, and the distance between the contraction structure and the outward convex structure is less than a preset value when the airbag body is unfolded.

7. The knee airbag according to claim 1, characterized by, a plurality of air-venting pull tapes are further included, the plurality of air-venting pull tapes are distributed and fixed on the airbag cloth sheet, the plurality of air-venting pull tapes divide the inner cavity of the airbag body into a plurality of cavities connected with each other, and air-venting holes are arranged on the plurality of air-venting pull tapes.

8. The knee airbag according to claim 1, characterized by, an external pull tape is further included, a first end of the external pull tape is fixed on the airbag cloth sheet, and a second end of the external pull tape is fixed on a gas generator, and the gas generator is arranged in the inner cavity of the airbag body.

9. The knee airbag according to claim 1, characterized by, The edge of the airbag cloth is provided with a plurality of tabs, the airbag cloth is folded to have the tabs stacked, and the tabs are sewn to each other. When the knee airbag is inflated, the sewn tabs pull the portions of the airbag body connected to the housing of the vehicle and the opposite portions to each other, so that the portion of the airbag body opposite to the knee of the occupant is close to the dashboard of the vehicle.

10. A vehicle characterized by comprising: The knee airbag includes the airbag according to any one of claims 1 to 9.

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