JP2018127116A - Knee airbag and knee airbag device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knee airbag which achieves simplification of a structure of the knee airbag while maintaining occupant restraint force, and to provide a knee airbag device.SOLUTION: A knee airbag device 1 includes: a knee airbag 2 which may be inflated and expanded between a dash board D and a lower leg part of an occupant M; and an inflator 3 which supplies a gas to the knee airbag 2. The knee airbag 2 includes: a left expansion part 21 which restrains a left leg; a right expansion part 22 which restrains a right leg; and a center expansion part 23 which is disposed between the left expansion part 21 and the right expansion part 22 and is inflated and expanded so as to protrude toward the occupant M. The center expansion part 23 includes: a center front surface part 23a which is located in front of the occupant M during inflation and expansion; and center extension parts 23b which are located at both sides of the center front surface part 23a and may be stored at a back surface of the center front part 23a while being folded in a bellows shape.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a knee airbag and a knee airbag device, and more particularly to a knee airbag and a knee airbag device capable of simplifying the structure of the knee airbag.

  A vehicle such as an automobile may be provided with a knee airbag device for absorbing an impact generated in an occupant's lower leg (a portion including knees and shins) in a vehicle collision. Such knee airbag devices are generally arranged on a dashboard, which is an interior cover in front of the occupant's knees, and are configured to inflate and deploy the airbag between the dashboard and the occupant when the vehicle collides.

  In such a knee airbag device, it has already been proposed to inflate and deploy the airbag between the occupant's knees so that the occupant's knee does not flow diagonally forward when an offset collision or an oblique collision occurs. (For example, refer to Patent Document 1 and Patent Document 2).

JP-A-2005-145111 JP 2012-121572 A

  However, the knee airbag device described in Patent Document 1 or Patent Document 2 requires both a bag body that restrains the shin portion from the knee and a bag body that is inserted between the knees. There is a problem that the structure of the airbag must be three-dimensional or a plurality of bags must be combined, and the structure of the airbag becomes complicated.

  The present invention has been devised in view of the above-described problems, and provides a knee airbag and a knee airbag device capable of simplifying the structure of a knee airbag while maintaining occupant restraining force. With the goal.

  According to the present invention, in a knee airbag that can be inflated and deployed between a dashboard and a lower leg of an occupant, a left inflatable portion that restrains a left foot, a right inflatable portion that restrains a right foot, and the left inflatable portion. A central inflatable portion disposed between the right inflatable portion and inflated and deployed so as to protrude toward the occupant, and the central inflatable portion is located on the front surface of the occupant during inflation and deployment. And a central expansion portion that is located on both sides of the central front portion and can be accommodated in a state of being folded bellows on the back surface of the central front portion.

  Further, according to the present invention, in a knee airbag device including a knee airbag that can be inflated and deployed between a dashboard and a lower leg of an occupant, and an inflator that supplies gas to the knee airbag, The knee airbag is disposed between the left inflating portion that restrains the left foot, the right inflating portion that restrains the right foot, and the left inflating portion and the right inflating portion, and is inflated and deployed so as to protrude toward the occupant. A central inflatable portion, and the central inflatable portion is located at the front of the occupant when inflated and deployed, and is bellows-folded at the back of the central front portion located on both sides of the central front portion. A knee airbag device characterized in that it includes a central extension portion that can be accommodated in a wet state.

  In the above-described knee airbag and knee airbag device, the knee airbag includes a front panel disposed on the occupant side, a rear panel disposed on the dashboard side, and an outer periphery of the front panel and the rear panel. An outer peripheral stitching portion, wherein the central front portion and the central extension portion are disposed on the front panel, and the central extension portion is stitched by the outer circumference stitching portion in a accordion-folded state. .

  In addition, the left inflatable part is a left front part positioned on the front surface of the occupant when inflated and deployed, and a left side expansion that can be accommodated in a state in which the left front part is located on the left side of the left front part and is bellows-folded on the back of the left front part. May be provided. The left extension may be arranged on a front panel arranged on the occupant side, or may be arranged on a rear panel arranged on the dashboard side.

  In addition, the right inflating portion includes a right front portion positioned on the front surface of the occupant when inflated and deployed, and a right side expansion that is positioned on the right side of the right front portion and can be accommodated in a state in which the bellows is folded on the back surface of the right front portion. May be provided. The right extension may be disposed on a front panel disposed on the occupant side, or may be disposed on a rear panel disposed on the dashboard side.

  The left inflating part and the right inflating part are a first non-inflating part formed at a position corresponding to the knee of the occupant, and a second non-inflating part formed at a position corresponding to the shin of the occupant. , May be included. Furthermore, the left side expansion part and the right side expansion part may have a third non-expansion part formed between the first non-expansion part and the second non-expansion part.

  According to the above-described knee airbag and knee airbag device according to the present invention, the central expansion portion is disposed in the central expansion portion, so that when the knee airbag is inflated and deployed, the bellows-folded central expansion portion is replaced with the knee airbag. The center front part can be protruded toward the passenger. Therefore, according to the present invention, the knee airbag can be inflated and deployed between the knees of the occupant, and the occupant restraining force can be maintained. Further, according to the present invention, it is not necessary to sew the knee airbag three-dimensionally or to combine a plurality of bag bodies, so that the structure of the knee airbag can be simplified.

It is sectional drawing which shows the knee airbag apparatus which concerns on 1st embodiment of this invention, (A) has shown the state before expansion | deployment and (B) has shown the state after completion of expansion | deployment. It is a top view which shows the cut part of the base fabric which comprises the knee airbag which concerns on 1st embodiment shown in FIG. 1, (A) has shown the front panel and (B) has shown the rear panel. It is a figure which shows the folding method of the front panel shown to FIG. 2 (A), (A) is the state before folding, (B) is the state after folding, (C) is CC in FIG. 3 (B). FIG. It is a figure which shows the state which stitch | sutured the front panel and the rear panel, (A) is a top view, (B) is the BB sectional drawing in FIG. 4 (A). It is a figure which shows the shape of the knee airbag after completion | finish of expansion | deployment, (A) is a perspective view of a knee airbag single-piece | unit, (B) is a perspective view of a vehicle-mounted state. It is a figure which shows the knee airbag which concerns on other embodiment of this invention, (A) is 2nd embodiment, (B) is 3rd embodiment, (C) has shown 4th embodiment.

  Embodiments of the present invention will be described below with reference to FIGS. 1 (A) to 6 (C). Here, FIG. 1 is a cross-sectional view showing the knee airbag device according to the first embodiment of the present invention, in which (A) shows a state before inflating and deploying, and (B) shows a state after completing inflating and deploying. ing. 2 is a plan view showing cut parts of the base fabric constituting the knee airbag according to the first embodiment shown in FIG. 1, wherein (A) shows a front panel and (B) shows a rear panel. . 3A and 3B are diagrams showing a method of folding the front panel shown in FIG. 2A, in which FIG. 3A shows a state before folding, FIG. 3B shows a state after folding, and FIG. 3C shows FIG. CC sectional drawing in FIG. 4A and 4B are diagrams illustrating a state in which the front panel and the rear panel are stitched together, in which FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along line BB in FIG. FIGS. 5A and 5B are views showing the shape of the knee airbag after completion of the inflation and deployment, in which FIG. 5A is a perspective view of the knee airbag alone, and FIG. 5B is a perspective view of an in-vehicle state.

  The knee airbag device 1 according to the first embodiment of the present invention can be inflated and deployed between the dashboard D and the lower leg of the occupant M, as shown in FIGS. 1 (A) to 5 (B). A knee airbag 2 and an inflator 3 that supplies gas to the knee airbag 2. The knee airbag 2 includes a left inflatable portion 21 that restrains the left foot, a right inflatable portion 22 that restrains the right foot, and a left side. A central inflatable portion 23 that is disposed between the inflatable portion 21 and the right inflatable portion 22 and is inflated and deployed so as to protrude toward the occupant M. The center front part 23a located and the center expansion part 23b which can be accommodated in the state bellows folded in the back surface of the center front part 23a located in the both sides of the center front part 23a are provided. In addition, in FIG. 1 (A) and FIG. 1 (B), the state which notched a part of dashboard D is shown in figure.

  Dashboard D is a general term for all interior parts arranged in front of a front seat of a vehicle. Below the dashboard D, an accelerator pedal and a brake pedal are arranged. When the occupant M gets on, the lower leg is arranged between the floor and the dashboard D. The lower leg part is a part including the knee Mk and the shin Ms. Further, as shown in FIG. 1A, a steering wheel S and a steering column C are disposed on the surface of the dashboard D on the occupant M side in the driver's seat.

  The inflator 3 has, for example, a substantially cylindrical outer shape, and a gas outlet is formed in a portion enclosed in the knee airbag 2. The inflator 3 is connected to an ECU (electronic control unit) (not shown) and is controlled based on measurement values of an acceleration sensor or the like. When the ECU detects a vehicle collision, the chemical stored in the inflator 3 is burned to generate gas, and the gas is supplied to the knee airbag 2.

  The inflator 3 and the knee airbag 2 are accommodated and fixed in a box-shaped retainer 4 as shown in FIG. 1A, for example. The retainer 4 is fixed to an in-vehicle structure disposed in the dashboard D via a bracket or the like. Further, the dashboard D located on the front surface of the retainer 4 is formed with a thin portion (tea line) that tears the dashboard D when the knee airbag 2 is inflated and deployed.

  The knee airbag 2 includes, for example, a front panel 2f arranged on the occupant M side shown in FIG. 2 (A) and a rear panel 2r arranged on the dashboard D side shown in FIG. 2 (B). A bag is formed by stitching the outer periphery together. Further, the lower leg portion of the occupant M seated in the driver's seat is often shifted to the left or right side with respect to the steering column C. For example, as shown in FIG. You may have an asymmetrical shape.

  For example, in the front panel 2f illustrated in FIG. 2A, the right width Wf2 is wider than the left width Wf1 with respect to the center line. Also, the rear panel 2r shown in FIG. 2B is formed so that the right width Wr2 is wider than the left width Wr1 with respect to the center line. In the front panel 2f and the rear panel 2r, which of the left and right widths is increased depends on conditions such as the structure of the vehicle body and the position of the driver's seat (left handle or right handle).

  The rear panel 2r has a lower part 2rb positioned in the vicinity of the retainer 4 at the time of inflating and deploying, and an upper part 2ru positioned in the vicinity of the knee Mk of the occupant M at the time of inflating and deploying. The lower part 2rb has a lateral width relative to the upper part 2ru. Has a narrow T-shape. The front panel 2f is folded so that the outer shape matches the rear panel 2r, and the outer periphery is sewn.

  As shown in FIG. 3A, the front panel 2f has a plurality of folding lines set in the vertical direction. In FIG. 3A, a mountain fold portion is indicated by a one-dot chain line, and a valley fold portion is indicated by a two-dot chain line. A vertically long rectangular central front portion 23a is set at a substantially central portion of the front panel 2f. Fold lines L1 to L4 are set in order from the inside to the outside on both the left and right sides of the central front portion 23a. Note that the number and interval of the folding lines are arbitrary, and are not limited to the illustrated number and interval.

  The front panel 2f is mountain-folded on the back surface (dashboard D side) of the central front portion 23a along the fold line L1, and is valley-folded on the back surface (dashboard D side) of the central front portion 23a along the fold line L2. The fold line is folded on the back surface (dashboard D side) of the central front portion 23a along the fold line L3, and the fold is folded on the back surface (dashboard D side) of the central front portion 23a along the fold line L4. In this way, by folding the front panel 2f bellows on the back surface of the central front portion 23a along the folding lines L1 to L4, the central extension portion 23b is formed as shown in FIG.

  Further, as shown in FIG. 3A, the left front part 21a located on the front face of the left foot of the occupant M and the right foot of the occupant M are provided on the left and right sides of the portion constituting the central extension 23b of the front panel 2f. The right front part 22a located on the front is set. Fold lines L5 and L6 are set outside the left front portion 21a and the right front portion 22a.

  The left end portion of the front panel 2f is mountain-folded on the back surface (dashboard D side) of the left front surface portion 21a along the fold line L5, and on the back surface (dashboard D side) of the left front surface portion 21a along the fold line L6. The valley is folded. The right end portion of the front panel 2f is mountain-folded along the fold line L5 on the back surface (dashboard D side) of the right front surface portion 22a, and along the fold line L6, the back surface of the right front surface portion 22a (dashboard D side). )

  In this way, the both ends of the front panel 2f are bellows folded to the back of the left front part 21a or the right front part 22a along the fold lines L5 and L6, as shown in FIG. And the right side expansion part 22b is formed. That is, the left extension 21b is a portion that is located on the left side of the left front portion 21a and is bellows-folded on the back surface of the left front portion 21a. Moreover, the right side extended part 22b is a part which is located on the right side of the right side front part 22a and is bellows folded on the back side of the right side front part 22a.

  The portion constituting the left extension portion 21b of the front panel 2f is formed in a shape that matches the outer shape of the left front portion 21a when folded, and the portion constituting the right extension portion 22b of the front panel 2f is It is formed in a shape that matches the outer shape of the right front portion 22a when folded.

  Then, by folding the central extension 23b, the left extension 21b, and the right extension 22b, as shown in FIG. 3B, it is formed into a shape that matches the outer shape of the rear panel 2r shown in FIG. Is done. As shown in FIG. 4A, the front panel 2f and the rear panel 2r folded in this way are stitched on the outer periphery in a state in which the outer shapes coincide with each other to form the outer periphery stitched portion 24.

  Thus, by sewing the outer peripheries of the front panel 2f and the rear panel 2r, the upper and lower ends of the central extension 23b, the left extension 21b, and the right extension 22b are sewn and formed into a hook shape. The Therefore, the middle part in the vertical direction of the central extension part 23b, the left extension part 21b, and the right extension part 22b is maintained in a folded state when not inflated, and is released from the folded state when inflated and deployed. Can expand in the vertical direction.

  4A, the left front portion 21a constituting the left inflatable portion 21 and the right front portion 22a constituting the right inflatable portion 22 are formed at positions corresponding to the knees Mk of the occupant M. The first non-inflatable portion 25 may be formed, or the second non-inflatable portion 26 formed at a position corresponding to the shin Ms of the occupant M may be formed.

  The first non-inflatable portion 25 is sewn into, for example, a curved ring so as to correspond to the positions of the knees Mk of both a large occupant (for example, an adult male) and a small occupant (for example, an adult female). Even if the second non-inflatable portion 26 is a large occupant (for example, an adult male) or a small occupant (for example, an adult female), there is no significant change in the position of the shin Ms. Sewn into a circular shape.

  Further, a third non-expandable portion 27 that is sewn linearly may be formed between the first non-expandable portion 25 and the second non-expandable portion 26. By forming the third non-expanding portion 27, a gas flow path for supplying gas from the inflator 3 to each of the left expanding portion 21, the right expanding portion 22, and the central expanding portion 23 can be formed. Can be clearly defined. In FIG. 4A, the third non-inflatable portion 27 is sewn in a curved shape, but may be sewn in a linear shape.

  The knee airbag 2 shown in FIG. 4 (A) is, for example, in a state in which the left inflatable portion 21 and the right inflatable portion 22 are folded inward and then rolled from the upper end toward the lower end in FIG. 1 (A). As shown, it is housed within the retainer 4. In addition, the folding method of the knee airbag 2 at the time of accommodating in the retainer 4 may be bellows folding, or may be a combination of bellows folding and roll folding.

  When the inflator 3 is activated at the time of a vehicle collision and gas is supplied into the knee airbag 2, the knee airbag 2 is connected to the dashboard D and the lower leg of the occupant M as shown in FIG. Inflated and deployed between. Here, FIG. 5A is a perspective view showing the knee airbag 2 that has been inflated and deployed. 5 (A) and 5 (B), the vertical stripe pattern displayed on the surface of the knee airbag 2 shows how the folded portions of the central extension portion 23b, the left extension portion 21b, and the right extension portion 22b are displayed. It is shown in order to display whether it is expanding and developing.

  When the knee airbag 2 is inflated and deployed, the central inflating portion 23 is inflated by releasing the folded central expanding portion 23b, so that the central front portion 23a becomes the occupant M as shown in FIG. It expands and expands so as to protrude toward the side. Therefore, when the inflation and deployment of the knee airbag 2 is completed, a substantially cylindrical central inflatable portion 23 is formed at a substantially central portion of the knee airbag 2.

  In addition, the horizontal width (width in the left-right direction) of the central inflating portion 23 is set to a size that can be inflated and deployed in a gap between both knees of a small occupant (for example, an adult female), for example. The thickness of the central inflatable portion 23 (thickness in the direction from the dashboard D to the lower leg of the occupant M) is, for example, that the knee Mk of a large occupant (for example, an adult male) is The size is set so as not to get over 23.

  When the knee airbag 2 is inflated and deployed, the left inflatable portion 21 and the right inflatable portion 22 are inflated by releasing the inflated left and right expanded portions 21b and 22b, as shown in FIG. As shown, the left front portion 21a and the right front portion 22a expand and deploy in the thickness direction. Therefore, when the inflation and deployment of the knee airbag 2 is completed, the left and right inflating portions 21 and 22 having a substantially flat plate shape are formed on the left and right sides of the central inflating portion 23 of the knee airbag 2.

  Further, since the left inflating portion 21 has the left expanding portion 21b at the left end, the thickness of the portion on the left end side can be made larger than the side adjacent to the central inflating portion 23. A recess or a recess that restrains the surface can be formed. Similarly, since the right inflating portion 22 has the right expanding portion 22b at the right end, the thickness of the portion on the right end side can be made larger than the side adjacent to the central inflating portion 23. A recess or recess that restrains the right foot can be formed.

  Further, as shown in FIG. 5 (A), the knee airbag 2 has a thickness of the central inflating portion 23 larger than that of the left inflating portion 21 and the right inflating portion 22. The projecting output to the front (occupant M direction) of the central inflating portion 23 is larger than that of the left inflating portion 21 and the right inflating portion 22, and the reaction can form a recess 23 c along the back surface of the central inflating portion 23. .

  By forming the recess 23c, the knee airbag 2 can be inflated and deployed while avoiding the steering column C as shown in FIG. In addition, in the left inflating part 21 and the right inflating part 22 shown in FIG. 5 (B), a dent assuming a state in which the lower leg part of the occupant M is in contact is illustrated.

  According to the knee airbag 2 and the knee airbag device 1 according to the above-described embodiment, the central expansion portion 23b is disposed in the central expansion portion 23, so that the bellows-folded center is formed when the knee airbag 2 is inflated and deployed. The expansion part 23b can be inflated on the surface of the knee airbag 2, and the central front part 23a can be protruded toward the occupant. Therefore, the central inflating portion 23 of the knee airbag 2 can be inflated and deployed between the knees of the occupant M, and the occupant restraining force can be maintained.

  Further, according to the knee airbag 2 according to the present embodiment, the portion of the shin Ms from the knee Mk of the occupant M can be restrained, and even if the vehicle has an offset collision or an oblique collision, Lateral movement of the thigh can be suppressed.

  Further, according to the knee airbag 2 according to the present embodiment, there is no need to sew the knee airbag 2 three-dimensionally or to combine a plurality of bags, so that the structure of the knee airbag 2 is simplified. Can be achieved. Specifically, as described above, the central expansion portion 23, the left expansion portion 21, and the right expansion portion 22 can be formed simply by folding the front panel 2f into a predetermined shape and stitching the front panel 2f with the rear panel 2r.

  Furthermore, in the airbag 2 according to the present embodiment, there is no need to arrange a tether for adjusting the expansion thickness of the knee airbag 2, and the structure of the knee airbag 2 can be simplified. The manufacturing man-hours and manufacturing costs can be reduced.

  Next, a knee airbag 2 according to another embodiment of the present invention will be described with reference to FIGS. 6 (A) to 6 (C). Here, FIG. 6 is a figure which shows the knee airbag which concerns on other embodiment of this invention, (A) is 2nd embodiment, (B) is 3rd embodiment, (C) is 4th embodiment. Form. In addition, about the same component as the knee airbag 2 which concerns on 1st embodiment mentioned above, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The knee airbag 2 according to the second embodiment is formed symmetrically as shown in FIG. 6 (A). Specifically, in the knee airbag 2, the left width W1 and the right width W2 have the same size. For example, when the knee airbag device 1 is disposed in the passenger seat where the steering column C is not disposed, the symmetrical knee airbag 2 as shown in the present embodiment may be employed.

  As shown in FIG. 6 (B), the knee airbag 2 according to the third embodiment includes a left side expansion part 21b constituting the left side expansion part 21 and a right side extension part 22b constituting the right side expansion part 22 on the rear panel 2r. It is arranged. According to this embodiment, the left side extended portion 21b and the right side extended portion 22b can be inflated toward the dashboard D side, and the concave portion formed on the back surface of the central inflatable portion 23 of the knee airbag 2 after inflating and deploying. 23c (see FIG. 5A) can be enlarged.

  In the first embodiment, the left extension 21b and the right extension 22b are formed on the front panel 2f. In the third embodiment, the left extension 21b and the right extension 22b are formed on the rear panel 2r. It is not limited to the embodiment. For example, the left extension portion 21b and the right extension portion 22b may be formed on both the front panel 2f and the rear panel 2r.

  Alternatively, the left extension 21b may be formed on the front panel 2f and the right extension 22b may be formed on the rear panel 2r, or the left extension 21b may be formed on the rear panel 2r and the right extension 22b may be formed on the front panel 2f. Also good. Further, the left extension part 21b and the right extension part 22b may have different configurations (folding width, number of bellows folds, etc.), and either the left extension part 21b or the right extension part 22b is omitted. Also good.

  As shown in FIG. 6C, the knee airbag 2 according to the fourth embodiment is formed by forming a linear fourth non-inflatable portion 28 so as to connect adjacent second non-inflatable portions 26. is there. The fourth non-expandable portion 28 is configured to be sewn to the rear panel 2r while the central expansion portion 23b of the front panel 2f is folded. By forming the fourth non-expanding portion 28, it is possible to form a gas flow path that expands the central expanding portion 23 after the left expanding portion 21 and the right expanding portion 22 are expanded. Here, the fourth non-inflatable portion 28 is formed by a linear suture line extending in the left-right direction, but may be formed by a curved suture line curved toward the inflator 3 side.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Knee airbag apparatus 2 Knee airbag 2f Front panel 2r Rear panel 2rb Lower 2ru Upper 3 Inflator 4 Retainer 21 Left expansion part 21a Left front part 21b Left expansion part 22 Right expansion part 22a Right front part 22b Right expansion part 23 Central expansion part 23a Central front part 23b Central expansion part 23c Recess 24 Outer periphery stitching part 25 First non-inflatable part 26 Second non-inflatable part 27 Third non-inflatable part 28 Fourth non-inflatable part M Crew Mk Knee Ms Ticks C Steering column D Dashboard S Steering wheel L1-L6 Folding line

Claims (9)

In a knee airbag that can be inflated and deployed between the dashboard and the lower leg of the occupant,
A left inflating portion that restrains the left foot, a right inflating portion that restrains the right foot, and a central inflating portion that is disposed between the left inflating portion and the right inflating portion and is inflated and deployed so as to protrude toward the occupant. With
The central inflatable portion includes a central front portion located on the front surface of the occupant during inflation and deployment, and a central extension portion that is located on both sides of the central front portion and can be accommodated in a bellows-folded state on the back surface of the central front portion. Has
A knee airbag characterized by that.   The knee airbag includes a front panel disposed on the occupant side, a rear panel disposed on the dashboard side, and an outer peripheral stitching portion that stitches the outer periphery of the front panel and the rear panel. 2. The knee air according to claim 1, wherein the portion and the central extension portion are disposed on the front panel, and the central extension portion is stitched by the outer peripheral stitching portion in a state in which the bellows is folded. bag.   The left inflating part includes a left front part positioned on the front surface of the occupant when inflated and deployed, and a left extension part which is located on the left side of the left front part and can be accommodated in a accordion-folded state on the back of the left front part. The knee airbag according to claim 1, further comprising:   The knee airbag according to claim 3, wherein the left extension is disposed on a front panel disposed on the occupant side or a rear panel disposed on the dashboard side.   The right inflating part includes a right front part positioned on the front surface of the occupant when inflated and deployed, and a right extension part that is located on the right side of the right front part and can be accommodated in a bellows-folded state on the back of the right front part. The knee airbag according to claim 1, further comprising:   6. The knee airbag according to claim 5, wherein the right side expansion portion is disposed on a front panel disposed on the occupant side or a rear panel disposed on the dashboard side.   The left inflating portion and the right inflating portion include a first non-inflating portion formed at a position corresponding to the occupant's knee and a second non-inflating portion formed at a position corresponding to the occupant's shin. The knee airbag according to claim 1, comprising: a knee airbag.   The left side expansion part and the right side expansion part have a third non-expansion part formed between the first non-expansion part and the second non-expansion part, respectively. Knee airbag. In a knee airbag device comprising a knee airbag that can be inflated and deployed between a dashboard and a lower leg of an occupant, and an inflator that supplies gas to the knee airbag,
The knee airbag device according to any one of claims 1 to 8, wherein the knee airbag is the knee airbag described in any one of claims 1 to 8.