Knee safety air bag air bag

Abstract

The utility model relates to the technical field of air bags, in particular to a knee safety air bag which comprises an air bag body. A drawstring assembly is arranged in the air bag body; an air guide bag is arranged between the first cloth piece and the third cloth piece, and an air generating device is arranged in the air guide bag; the first drawstring, the second drawstring and the third drawstring are arranged on the air bag body, circulation spaces of the air bag body can be reserved on the two sides of the air bag body, and then the air bag body can be rapidly unfolded conveniently; the air guiding bag is arranged on the air bag body, so that the air generating device can quickly guide air to enter the two sides of the air bag body when the air bag body is inflated with the air through the air guiding bag, the air bag body can be better bent upwards, and the situation that the air bag body is prone to making contact with the knees of a passenger in the initial unfolding stage is effectively avoided; and the risk that the knees and the legs of the passenger are injured when the airbag body is unfolded is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of airbags, in particular to a knee safety airbag. Background Art

[0002] The knee airbag is installed at the bottom of the car dashboard assembly to prevent the passenger's knees and calves from being hit by hard objects in the car (such as the bottom of the dashboard) in a frontal collision accident. When a collision occurs, the knee airbag device will inflate the airbag through the inflation device. When the knee airbag is fully deployed from the bottom of the dashboard, the knee airbag will cover the lower surface of the dashboard to protect the passenger's knees and calves. During the deployment of the knee airbag, the following problems usually occur. See the publication number CN109318848A, which discloses a knee safety airbag including a front panel, a rear panel, and first and second drawstrings. The first drawstring is located between the panels and defines an outer chamber. The second drawstring is located between the panels and defines an inner chamber. The drawstrings together define a central chamber. The chambers in the inflated position are generally vertical and parallel. Although the patent can reduce the potential rotation of the tibia of the occupant's lower leg that can occur under oblique impact collisions and related asymmetric loads, there is still the problem of impact with the passenger's knees and legs during deployment, thereby affecting the protective effect of the knee airbag. Therefore, during the long-term research and development testing process: the knee airbag in the prior art is difficult to quickly guide the gas into both sides of the airbag, so that the airbag is easy to contact the passenger's knees in the early stage of deployment, causing direct impact on the passenger's knees and legs, and there is a problem of causing injury to the occupant. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a knee safety airbag to solve the problem that the airbag is prone to contact with the occupant's knees and cause injuries in the early stage of deployment.

[0004] Based on the above purpose, the utility model provides a knee airbag, comprising: an airbag body; the airbag body also comprises: a first cloth piece, a second cloth piece sewn to an edge of one side of the first cloth piece, and a third cloth piece sewn to an edge of one side of the second cloth piece; a drawstring assembly is arranged inside the airbag body, and the drawstring assembly comprises: a third drawstring arranged at both end edges of the second cloth piece, a first drawstring and a second drawstring arranged between the first cloth piece and the third cloth piece, air holes are provided on the first drawstring, the second drawstring and the third drawstring, the first drawstring and the second drawstring are arranged in a V shape in the airbag body, and a raised airbag supporting portion is formed on the third cloth piece between the first drawstring and the second drawstring; an air guide bag is arranged between the first cloth piece and the third cloth piece, and a gas generating device is arranged inside the air guide bag.

[0005] Preferably, a first draw strap seam is formed between the first draw strap and the third fabric piece, a second draw strap seam is formed between the second draw strap and the third fabric piece, a third draw strap seam is formed between one end of the third draw strap and the third fabric piece and the second fabric piece, a fourth draw strap seam is formed between the other end of the third draw strap and the third fabric piece and the second fabric piece, and a fifth draw strap seam is formed between the first fabric piece and the first draw strap and the second draw strap.

[0006] Preferably, the third fabric piece is bent with a first fold line in the middle, a first fabric seam and a second fabric seam are respectively formed on the third fabric piece at both ends of the first fold line, and the air bag support portion is formed between the first fabric seam and the second fabric seam.

[0007] Preferably, a second fold line is bent in the middle of the second fabric piece, a side seam and a third fabric seam are formed between the first fabric piece and the second fabric piece, and the first fabric piece and the second fabric piece are sewn together through the side seam and the third fabric seam.

[0008] Preferably, the first cloth piece and the second cloth piece are placed up and down.

[0009] Preferably, a first pre-sewn line is sewn at the middle of the first cloth piece, a first protrusion is formed on the first cloth piece on one side of the first pre-sewn line, a second pre-sewn line is sewn at one side of the middle of the second cloth piece, and a second protrusion is formed on the second cloth piece on one side of the second pre-sewn line.

[0010] The beneficial effects of the utility model are as follows: by arranging the first drawstring, the second drawstring and the third drawstring on the airbag body, circulation space of the airbag body can be reserved on both sides, thereby facilitating rapid deployment of the airbag body; by forming a raised airbag support portion on the third cloth piece between the first drawstring and the second drawstring, the gas generating device can quickly guide the gas into both sides of the airbag body when filling the air into the airbag body through the air guide bag, so that the airbag body can be better bent upwards, effectively avoiding the situation where the airbag body is easily in contact with the knees of the occupant in the initial stage of deployment, avoiding direct impact on the knees and legs of the passenger when the airbag body is deployed, and avoiding the risk of injury to the occupant. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is a schematic diagram of the structure of the air bag body of the utility model;

[0013] Figure 2 for Figure 1 Schematic diagram of the cross-section structure at A in the middle;

[0014] Figure 3 This is a schematic diagram of the unfolded structure of the third cloth piece of the utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the second cloth piece of the utility model;

[0016] Figure 5 This is a schematic diagram of the third cloth piece structure of the utility model;

[0017] Figure 6 It is a schematic diagram of the structure of the air bag body after being inflated.

[0018] Markings in the figure are: 1. airbag body; 2. first drawstring; 3. second drawstring; 4. third drawstring; 5. air guide bag; 6. gas generating device; 7. airbag supporting part; 8. first fold line; 9. second fold line; 10. first pre-stitched line; 11. second pre-stitched line; 101. first piece of fabric; 102. second piece of fabric; 103. third piece of fabric; 40a. first drawstring seam; 41a. second drawstring seam; 42a. third drawstring seam; 43a. fourth drawstring seam; 44a. fifth drawstring seam; 45a. side seam; 45b. first piece of fabric seam; 46b. second piece of fabric seam; 47b. third piece of fabric seam. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0020] like Figure 1-Figure 6 As shown, a knee airbag comprises: an airbag body 1; the airbag body 1 further comprises: a first fabric piece 101, a second fabric piece 102 sewn to one side edge of the first fabric piece 101, and a third fabric piece 103 sewn to one side edge of the second fabric piece 102; a drawstring assembly is arranged inside the airbag body 1, and the drawstring assembly comprises: a third drawstring 4 arranged at both ends of the second fabric piece 102, a first drawstring 2 and a second drawstring 3 arranged between the first fabric piece 101 and the third fabric piece 103, and a first drawstring 2 on the first drawstring 2 and a second drawstring 3 on the third drawstring 3. Air holes are provided on the second draw strap 3 and the third draw strap 4. The length of the draw strap assembly is smaller than the width of the airbag body 1. At the same time, flow space for the airbag body 1 is reserved on both sides to facilitate the rapid deployment of the airbag body 1. The first draw strap 2 and the second draw strap 3 are arranged in a V shape in the airbag body 1, and a raised airbag supporting portion 7 is formed on the third cloth piece 103 between the first draw strap 2 and the second draw strap 3; an air guide bag 5 is arranged between the first cloth piece 101 and the third cloth piece 103, and a gas generating device 6 is provided inside the air guide bag 5.

[0021] Among them, the first cloth piece 101, the second cloth piece 102 and the third cloth piece 103 can define the morphological structure of the airbag body 1 after inflation, and at the same time, the first drawstring 2, the second drawstring 3 and the third drawstring 4 are provided on the airbag body 1 to reserve circulation space for the airbag body 1 on both sides, thereby facilitating the rapid deployment of the airbag body 1. By forming a raised airbag support portion 7 on the third cloth piece 103 between the first drawstring 2 and the second drawstring 3, the gas generating device 6 can quickly guide the gas into the two sides of the airbag body 1 when filling the air into the airbag body 1 through the air guide bag 5, so that the airbag body 1 can be better bent upward, effectively avoiding the situation where the airbag body 1 is easy to contact with the occupant's knees in the initial stage of deployment, avoiding affecting the deployment of the knee airbag, and at the same time effectively avoiding the huge impact force of the airbag body 1 when it is deployed. Direct impact on the passenger's knees and legs, avoiding the risk of causing injury to the occupant.

[0022] A first drawstring seam 40a is formed between the first drawstring 2 and the third fabric piece 103, a second drawstring seam 41a is formed between the second drawstring 3 and the third fabric piece 103, a third drawstring seam 42a is formed between one end of the third drawstring 4 and the third fabric piece 103 and the second fabric piece 102, a fourth drawstring seam 43a is formed between the other end of the third drawstring 4 and the third fabric piece 103 and the second fabric piece 102, and the first fabric piece 101 is connected to the first drawstring 2 and the second drawstring 3. A fifth draw tape seam 44a is formed in between, and the first draw tape 2, the second draw tape 3 and the third draw tape 4 can be positioned through the formed first draw tape seam 40a, the second draw tape 3 and the third draw tape 4, and the airbag body 1 can be bent and shaped with the help of the first draw tape 2, the second draw tape 3 and the third draw tape 4, so that the gas can be further guided to the two sides of the airbag body 1 after being filled into the airbag body 1.

[0023] In order to enable the airbag body 1 to be bent upwards better, the third cloth piece 103 is bent with a first folding line 8 in the middle, and the third cloth piece 103 at both ends of the first folding line 8 is respectively formed with a first cloth piece seam 45b and a second cloth piece seam 46b, the airbag supporting portion 7 is formed between the first cloth piece seam 45b and the second cloth piece seam 46b, the second cloth piece 102 is bent with a second folding line 9 in the middle, and a side seam 45a and a third cloth piece seam 47b are formed between the first cloth piece 101 and the second cloth piece 102, and the first cloth piece 101 and the second cloth piece 102 are sewn together by the side seam 45a and the third cloth piece seam 47b; the first cloth piece 101 and the second cloth piece 102 are placed up and down, and the airbag body can be bent upwards through the airbag supporting portion 7, and at the same time, the length of the upper airbag body 1 can be further shortened in cooperation with the first pre-sewn line 10 and the second pre-sewn line 11, so that the airbag body 1 can be bent better.

[0024] In order to further adapt to installation under different instrument panels, a first pre-stitched line 10 is sewn in the middle of the first cloth piece 101, and a first protrusion is formed on the first cloth piece 101 on one side of the first pre-stitched line 10; a second pre-stitched line 11 is sewn on one side of the middle of the second cloth piece 102, and a second protrusion is formed on the second cloth piece 102 on one side of the second pre-stitched line 11, so that the length of the cloth on the inner side of the airbag body 1 can be controlled by pre-stitching, and then the deployment angle of the airbag body 1 can be controlled, thereby adapting to the installation requirements of instrument panels of various specifications.

[0025] Working principle: When in use, by providing the first drawstring 2, the second drawstring 3 and the third drawstring 4 on the airbag body 1, circulation space for the airbag body 1 can be reserved on both sides, thereby facilitating the rapid deployment of the airbag body 1. By forming a raised airbag support portion 7 on the third cloth piece 103 between the first drawstring 2 and the second drawstring 3, the gas generating device 6 can quickly guide the gas into the two sides of the airbag body 1 when filling the air into the airbag body 1 through the air guide bag 5, so that the airbag body 1 can be better bent upward.

Claims

1. A knee airbag, comprising: An airbag body (1); characterized in that the airbag body (1) further comprises: a first fabric piece (101), a second fabric piece (102) sewn to one side edge of the first fabric piece (101), and a third fabric piece (103) sewn to one side edge of the second fabric piece (102); a drawstring assembly is arranged inside the airbag body (1), and the drawstring assembly comprises: a third drawstring (4) arranged at both end edges of the second fabric piece (102), a first drawstring (2) arranged between the first fabric piece (101) and the third fabric piece (103); and a second drawstring (3); air holes are provided on the first drawstring (2), the second drawstring (3) and the third drawstring (4); the first drawstring (2) and the second drawstring (3) are arranged in a V-shape inside the airbag body (1); a raised airbag support portion (7) is formed on the third cloth piece (103) between the first drawstring (2) and the second drawstring (3); an air guide bag (5) is arranged between the first cloth piece (101) and the third cloth piece (103); a gas generating device (6) is provided inside the air guide bag (5).

2. A knee airbag according to claim 1, characterized in that: A first drawstring seam (40a) is formed between the first drawstring (2) and the third fabric piece (103), a second drawstring seam (41a) is formed between the second drawstring (3) and the third fabric piece (103), a third drawstring seam (42a) is formed between one end of the third drawstring (4) and the third fabric piece (103) and the second fabric piece (102), a fourth drawstring seam (43a) is formed between the other end of the third drawstring (4) and the third fabric piece (103) and the second fabric piece (102), and a fifth drawstring seam (44a) is formed between the first fabric piece (101), the first drawstring (2) and the second drawstring (3).

3. A knee airbag according to claim 1, characterized in that: A first fold line (8) is bent in the middle of the third fabric piece (103), a first fabric piece seam (45b) and a second fabric piece seam (46b) are respectively formed on the third fabric piece (103) at both ends of the first fold line (8), and the air bag support portion (7) is formed between the first fabric piece seam (45b) and the second fabric piece seam (46b).

4. A knee airbag according to claim 1, characterized in that: A second fold line (9) is bent in the middle of the second fabric piece (102); a side seam (45a) and a third fabric piece seam (47b) are formed between the first fabric piece (101) and the second fabric piece (102); the first fabric piece (101) and the second fabric piece (102) are sewn together via the side seam (45a) and the third fabric piece seam (47b).

5. A knee airbag according to claim 4, characterized in that: The first cloth piece (101) and the second cloth piece (102) are placed one above the other.

6. A knee airbag according to claim 1, characterized in that: A first pre-sewn thread (10) is sewn to the middle of the first fabric piece (101), and a first protrusion is formed on the first fabric piece (101) on one side of the first pre-sewn thread (10); a second pre-sewn thread (11) is sewn to one side of the middle of the second fabric piece (102), and a second protrusion is formed on the second fabric piece (102) on one side of the second pre-sewn thread (11).

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