JP5223115B2 - Airbag device for motorcycle - Google Patents

Description

  The present invention relates to an airbag apparatus for a motorcycle that is mounted on a motorcycle and includes an airbag for protecting an occupant during a collision.

  Conventionally, as an airbag apparatus for a motorcycle, when an inflating gas flows in, an occupant who expands and inflates upward from a storage part near the left and right legs of the occupant seated on the seat and moves to the front side. The air bag is configured to include an airbag that can be received to complete the inflation (see, for example, Patent Document 1). In the airbag, when the inflation is completed, the upper end protrudes upward from the handle extending from the upper end of the stem shaft to the left and right, and is configured to receive the occupant moving forward.

JP 2006-168712 A

  However, in the conventional airbag apparatus for a motorcycle, since the upper end of the airbag has been protruded upward from the handle, the airbag has been largely cut to one of the left and right sides. When inflated, at least the grip end of one of the left and right handles interferes with the upper end of the airbag, and the airbag may be shifted to the left or right from the front of the occupant, or cannot be inflated to the inflated shape. There was a fear.

  In particular, when an inflated airbag is cut in a plan view, the occupant is received with a good cushioning capacity as a volume that greatly expands so as to interfere with at least the grip end of one of the left and right handles. If it is a structure, the said subject will be further encouraged.

  The present invention solves the above-mentioned problem, and even if the airbag is inflated with the handle largely cut, the airbag that has been stably inflated is disposed in front of the occupant. It is an object of the present invention to provide an airbag apparatus for a motorcycle that can be used.

The airbag apparatus for a motorcycle according to the present invention is an air bag for catching an occupant in a protective manner on the front side or the rear side of a stem shaft in which a handle extending on both the left and right sides is disposed on the upper end side when inflating gas flows. While the bag is configured to be inflated and arranged upward from the storage site,
An airbag device for a motorcycle having a configuration in which the airbag when inflated is arranged so as to overlap at least the terminal side of the grip of one of the left and right handles when the handle is cut in a plan view. And
Airbag
It is possible to suppress interference with the terminal side of the grip at the handle when cutting,
The upper surface of the completely inflated, causes disposed lowered left and right both end side from the center portion of the position in the lateral direction, so as to decrease gradually from the central portion in the lateral direction on both end sides of the right and left, in an inclined, constitutes ,
In the state of front view when the inflation is completed, the protruding tops in the left and right direction are arranged at approximately the same height as the terminals of the left and right grips as a shape that spreads from the lower end side to the upper end side on the storage site side To be configured,
The part of the peripheral wall at the completion of expansion
It is composed of a ceiling wall part that forms the upper surface side, a rear wall part on the passenger side, a front wall part on the front surface side, and a bottom wall part that is held in the storage part,
From the 1st base fabric which consists of a base fabric for bags which makes a back wall part, a front wall part, and a bottom wall part extend a back wall part and a front wall part with a bottom wall part in between Forming a ceiling wall portion from a second base fabric made of an elliptical plate base fabric having a long axis in the left-right direction;
Fold at the bottom wall portion of the first base fabric, overlap the rear wall portion and the front wall portion, sew the peripheral edges of the left and right edges, and on the upper edge side of the rear wall portion and the front wall portion, Sew the front and back edges of the ceiling wall of the base fabric,
It is characterized by forming .

  In the airbag apparatus for a motorcycle according to the present invention, even when the airbag is completely inflated with the handle largely cut to one side in the left-right direction, at least interference with the terminal side of the handle grip can be suppressed. In addition, the upper surface side of the airbag at the completion of the inflation is formed so as to lower the left and right ends from the center in the left-right direction. Therefore, the airbag can be prevented from shifting from the front side of the occupant by suppressing interference with the terminal side in the grips of the left and right handles, and can be smoothly inflated to the inflated shape.

  Therefore, in the airbag apparatus for a motorcycle according to the present invention, even when the airbag is inflated in a state where the handle is largely cut, the airbag which has been stably expanded is disposed in front of the occupant. Can be made.

The airbag is configured to be inclined so that the upper surface side at the time of completion of inflation is gradually lowered from the center in the left-right direction to the left and right ends.

  In such a configuration, the center side part away from the end part in the left and right direction on the upper surface side of the airbag interferes with the terminal side of one of the left and right grips of the handle in the cut state. However, as the upper surface side of the inflating airbag rises, the inclined surface that descends in the left-right direction on the upper surface side of the airbag slides as a guide surface with the interfering grip, and the upper surface side of the airbag The left and right central portions are moved so as to be disposed on the front side of the occupant, and the inflation can be smoothly completed to the inflation completed shape.

In addition , the airbag has a shape that spreads from the lower end side toward the upper end side toward the upper end side in the front view when the inflation is completed, and the protruding top portion in the left-right direction is substantially the same as the terminals of the left and right grips. It is configured to be arranged at the height position .

  In such a configuration, when the airbag is inflated with the handle turned off, the inclined surface on the upper surface side of the airbag slides as a guide surface on the terminal side of the grip, The entire area can be arranged between the left and right handles. At this time, the airbag is arranged in a high position at the same height as the terminal of the grip, which is a high position, without lowering the protruding top part in the left and right direction at the completion of inflation as much as possible. Further, the expansion can be completed in the entire area of the large volume, and a good cushioning property can be secured and the occupant can be received.

In addition , the airbag is a part of the peripheral wall when the inflation is completed,
It is composed of a ceiling wall part that forms the upper surface side, a rear wall part on the passenger side, a front wall part on the front surface side, and a bottom wall part that is held in the storage part,
From the 1st base fabric which consists of a base fabric for bags which makes a back wall part, a front wall part, and a bottom wall part extend a back wall part and a front wall part with a bottom wall part in between Forming a ceiling wall portion from a second base fabric made of an elliptical plate base fabric having a long axis in the left-right direction;
Fold at the bottom wall portion of the first base fabric, overlap the rear wall portion and the front wall portion, sew the peripheral edges of the left and right edges, and on the upper edge side of the rear wall portion and the front wall portion, Sew the front and back edges of the ceiling wall of the base fabric,
Forming.

  In such a configuration, the upper surface side of the airbag in which both the left and right ends when the inflation is completed can be arranged below the central portion can be formed from a single elliptical plate-shaped base fabric for the bag. Thus, a large surface of the airbag can be easily secured so that a wide surface in the front-rear direction can be secured without protruding upward, and as a result, the cushioning property can be improved.

Moreover, as a part of the peripheral wall of the other airbag of the elliptical plate-shaped ceiling wall part constituting the upper surface side of the airbag, the rear wall part and the front wall part are extended with the bottom wall part in between. It forms a base fabric for a single bag, overlapping the rear wall and the front wall portion is folded at the site of the bottom wall portion, and sewing the right and left edges mutual peripheral, rear wall and a front wall portion If the front and rear edges of the ceiling wall portion are stitched to the upper edge side, the airbag can be easily manufactured. In this case, an airbag can be comprised from two base fabrics for bags .

  Furthermore, in the airbag apparatus for a motorcycle according to the present invention, the airbag can be accommodated on the rear side of the stem shaft so as to support the front side of the airbag when the inflation is completed, and by the airbag when inflated. A support member pulled up from the storage site may be disposed on the front side of the airbag.

  In such a configuration, when the airbag is inflated, the support material is pulled up from the storage portion, and the airbag when the inflation is completed is supported by the support material on the front side thereof. Therefore, a good cushioning property can be secured and an occupant can be received. And since the airbag itself can suppress the interference with the terminal side of the grip in the handle in the cut state and can be smoothly inflated to the upper end side, even if the handle is largely cut, it is stable. The support material can be pulled up, and in the state of being supported by the support material, good cushioning properties can be secured and the occupant can be received.

1 is a side view of a motorcycle equipped with a motorcycle airbag device according to an embodiment of the present invention. It is a general | schematic fragmentary sectional view along the front-back direction of the airbag apparatus of embodiment. It is a perspective view showing the state where the airbag used for the airbag device of an embodiment was inflated independently in the state where the retainer was provided. It is a longitudinal cross-sectional view along the front-back direction at the time of completion | finish of inflation of the airbag of embodiment, and respond | corresponds to the IV-IV site | part of FIG. It is a cross-sectional view along the left-right direction at the time of completion of inflation of the airbag of the embodiment, and corresponds to the VV portion of FIG. It is a top view which shows the constituent material used for the airbag of embodiment. It is the schematic front view seen from the front side explaining the time of operation | movement of the airbag apparatus of embodiment, and shows the state which does not cut a handle. It is a schematic plan view explaining the time of operation | movement of the airbag apparatus of embodiment, and shows the state which does not cut a handle. It is the schematic front view seen from the front side explaining the time of action | operation of the airbag apparatus of embodiment, and shows the state which cut the handle | steering-wheel. It is the schematic front view seen from the front side explaining the action | operation time of the airbag apparatus of embodiment, and shows the state after FIG. It is a schematic plan view explaining the time of the action | operation of the airbag apparatus of embodiment, and shows the state which cut the handle | steering-wheel. It is a schematic plan view explaining the time of the action | operation of the airbag apparatus of embodiment, and shows the state after FIG.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A motorcycle airbag device (hereinafter simply referred to as an airbag device) 20 according to the embodiment includes a scooter type motorcycle as shown in FIG. (Hereinafter simply referred to as a two-wheeled vehicle) 1. The two-wheeled vehicle 1 includes a foot 13 of the occupant D between a seat 13 on which the occupant D sits and a head pipe 3 a of the frame 3 in front of the seat 13. Step 12 for placing F is disposed, and the airbag device 20 is disposed near the front end of the seat 13. The frame 3 on the body 2 side of the motorcycle 1 is provided with a head pipe 3a through which the stem shaft 5 is inserted on the front end side. The stem shaft 5 is connected to a front fork 4 extending downward, and has an upper end. Further, a mounting plate 6 to which a handle 7 (7L, 7R) extending in the left-right direction is attached is fixed.

  Note that the front-rear and left-right directions in the specification and the like of the present application are based on the two-wheeled vehicle 1 at the time of forward movement, and coincide with the front-rear, left-right directions of the occupant D seated on the two-wheeled vehicle 1.

  As shown in FIGS. 1 and 2, the airbag device 20 stores and holds the airbag 21, the inflator 44 that supplies the inflation gas to the airbag 21, and the folded airbag 21, and also holds the inflator 44. A case 48, a support member 57 that supports the front surface 21c side of the inflated airbag 21 on the rear surface 57b side, a connection belt 32 for pulling up the support member 57, and a regulation belt that restricts forward movement of the upper portion 21a of the airbag 21 37.

  The case 48 constitutes a housing part for the folded airbag 21, and is made of a box-shaped sheet metal having an upper opening, and has a rectangular plate-shaped bottom wall portion 49 and the vicinity of the outer peripheral edge of the bottom wall portion 49. And a peripheral wall portion 50 having a substantially rectangular tube shape extending upward. The bottom wall portion 49 is formed with a circular opening 49a into which the main body portion 45 of the inflator 44 is inserted from below. The case 48 is provided with a connection bracket (not shown), and the connection bracket is connected and fixed to a bracket 10 extending from the frame 3 on the body (vehicle body) 2 side of the motorcycle 1 (see FIG. 1). As a result, the case 48 holding the airbag 21 and the inflator 44 is disposed in the vicinity of the left and right knees K (KL, KR, see FIG. 7) of the seated occupant D near the front end of the seat 13. The two sides are connected and fixed.

  As shown in FIG. 2, the inflator 44 includes a cylindrical main body 45 having a plurality of gas discharge ports 45 a on the upper side, and a flange 46 that protrudes from the outer peripheral surface of the main body 45. The flange portion 46 is fixed to the lower surface side of the bottom wall portion 49 of the case 48.

  A substantially square annular retainer 41 having bolts 41a at four corners is disposed at the periphery of the inflow opening 22a of the airbag 21. Then, the bolt 41a of the retainer 41 is passed through the peripheral edge of the inflow opening 22a of the airbag 21, the bottom wall portion 49 of the case 48, and the flange portion 46, and is fastened to the nut 42, thereby fixing the flange portion of the inflator 44. 46 is fixed to the bottom wall portion 49 of the case 48 together with the airbag 21.

  The inflator 44 is electrically connected to a control circuit (not shown) mounted on the two-wheeled vehicle 1 via a lead wire (not shown), and when the shock is applied to the two-wheeled vehicle 1, the control circuit detects a predetermined detection sensor. The operation signal is output to the inflator 44.

  As shown in FIGS. 1 to 5, the airbag 21 has a substantially quadrangular prism shape (substantially) having a bottom wall portion 22, a front wall portion 23, a rear wall portion 24, and a ceiling wall portion 25 as a shape when inflation is completed. Fan-shaped). And the airbag 21 of embodiment is comprised so that the ceiling wall part 25 by the side of the upper surface 21e may be arrange | positioned in the position which lowered | hanged the left and right both ends (left end 25a and right end 25b) side from the center part 25c of the left-right direction. ing.

  More specifically, the upper surface 21e side of the airbag 21 when the inflation is completed is inclined so as to be gradually lowered from the center portion 25c in the left-right direction of the ceiling wall portion 25 toward the left and right left ends 25a and the right end 25b. Configured. In the case of the embodiment, the upper surface 21e side when the expansion is completed is a front view seen from the front side, and the portion that extends from the central portion 25c to the left and right left ends 25a and the right end 25b side is swelled upward by about 1/4 yen. It is formed as an inclined surface (guide surface) 26 formed in a circular arc shape. In the embodiment, the radius R of the arcuate upper surface 21e is about 520 mm (see B in FIG. 7).

  Furthermore, in the case of the embodiment, the airbag 21 spreads from the lower end (lower part) 21b side on the storage site (case) 48 side toward the upper end (upper part) 21a side in the front view when the inflation is completed. As a shape, the projecting top portions 21 f and 21 g on both the left and right sides are arranged at substantially the same height as the terminals 8 a of the left and right grips 8. In the case of the embodiment, the left and right protruding top portions 21f and 21g are arranged inside the terminals 8a and 8a of the left and right grips 8 and 8 in a front view (see FIG. 7), and the left and right grips. 8 and 8 terminals 8a and 8a are arranged on the rear side.

  Further, in the airbag 21, as the relationship between the ceiling wall portion 25 and the left and right handles 7L and 7R when the inflation is completed in a state where the two-wheeled vehicle 1 is traveling straight, at least a grip is provided if the handles 7L and 7R are largely cut. 8 is configured so as to interfere (contact) the ceiling wall portion 25 (see the two-dot chain line in FIG. 8B, FIGS. 9 and 10).

  Incidentally, in the case of the embodiment, as shown in FIG. 7B, the airbag 21 at the completion of the inflation has a width dimension in the left-right direction (a width dimension between the protruding top portions 21f and 21g) BW of 510 mm and a central portion 25c. The distance LD between the left and right projecting top portions 21f and 21g (the left end 25a and the right end 25b of the ceiling wall portion 25) that is lowered from the center is about 150 mm. Moreover, the airbag 21 at the time of completion of inflation has a thickness dimension BT of 320 mm (see B in FIG. 8).

  And in the case of embodiment, the airbag 21 is formed from the base fabric for bags (1st base fabric 27 and 2nd base fabric 28) as a raw material which comprises a surrounding wall (refer FIG. 6). The second base fabric 28 forms a portion of the peripheral wall that forms the upper surface 21e side when the expansion is completed, that is, the ceiling wall portion 25, and has an elliptical plate shape with the long axis X provided in the left-right direction. Further, the first base fabric 27 constitutes the bottom wall portion 22, the front wall portion 23, and the rear wall portion 24.

  When the airbag 21 protrudes from the case 48 which is a storage part and completes inflating, the width dimension in the left-right direction is reduced, and the left and right thighs TL, TR of the occupant D seated on the seat 13 on the lower side 21b side. (See FIG. 7) The upper 21a side can be disposed between the waist W and the chest B of the occupant D and the chest B (see FIG. 1), and the riding posture of the occupant D seated on the seat 13 The dimensions are set so as not to interfere with the left and right arms A (see FIG. 1) of the occupant D.

  In addition, a circular inflow opening 22a for allowing inflation gas to flow in is formed in the bottom wall portion 22 of the airbag 21, and each bolt 41a of the retainer 41 is inserted through the periphery of the inflow opening 22a. A mounting hole 22b (see FIGS. 3 and 6) is formed. The peripheral edge of the inflow opening 22a is pressed by the retainer 41 to become an attachment fixing portion 22c attached to the bottom wall portion 49 of the case 48 (see FIG. 2).

  Furthermore, in the airbag 21 of the embodiment, the inner bag 30 is disposed inside. When the airbag 21 is inflated, the inner bag 30 is disposed to smoothly lift the support material 57 while completing the inflation before the entire airbag 21 is inflated. The inner bag 30 is connected from the entire area of the bottom wall portion 22 on the inner peripheral side of the airbag 21 to the central portion 23a in the left-right direction of the front wall portion 23, and is arranged on the rear surface side from the bottom wall portion 22 side. An inflow port 30b is provided for inflating the entire airbag 21 by allowing the inflation gas flowing into the airbag 21 to flow out toward the rear wall 24 of the airbag 21.

  In the case of the embodiment, the outlet 30b has a height position substantially equal to the horizontal bar portion 58 (upper portion 57a) which is a connection portion with the connection belt 32 in the support member 57 arranged at the support position of the airbag 21. Are arranged (see FIG. 2). Incidentally, a portion (upper end portion) of the inner bag 30 above the outflow port 30b becomes a gas reservoir 30a for storing the inflation gas when the support member 57 is pulled up, and this gas reservoir 30a serves as an inflow opening. The support material 57 is pulled up by being pushed up by the inflation gas flowing in from 22a.

  Further, in the airbag 21 at the time of completion of the inflation, the inner bag 30 is stitched to an area up to the vicinity immediately below the upper edge 23b of the front wall portion 23, and the height dimension from the bottom wall portion 22 at the time of completion of the inflation. IH is about 460 mm lower than the height dimension BH (520 mm in the embodiment) of the airbag 21 itself, and the width dimension IW in the left-right direction is about 215 mm.

  The first base cloth 27, the second base cloth 28, and the third base cloth 29 forming the inner bag 30 are made of a woven cloth such as flexible polyamide or polyester.

  As shown in FIGS. 2 to 5, the connection belt 32 is connected to the central portion 25 c of the ceiling wall portion 25 on the front edge side of the upper surface 21 e of the airbag 21 by stitching the upper end 32 a. The connecting belt 32 is formed by overlapping two woven fabrics such as flexible polyamide and polyester. The lower end 32 b side is connected to the horizontal bar portion 58 of the support member 57. The lower end 32b has a bifurcated shape that wraps the horizontal bar portion 58, and is sandwiched between metal abutting plates 33, 33, and the abutting plates 33, 33 are coupled together using a plurality of bolts 34 and nuts 35. Thus, the horizontal bar portion 58 is wrapped and connected to the horizontal bar portion 58.

  The length LF (see FIG. 2) between the upper end 32a and the lower end 32b of the connection belt 32 is determined when the airbag 21 that is folded and accommodated is inflated by inflating with an inflation gas. Using the belt 32, the support material 57 is pulled up from the state of being stored in front of the case 48, and the support material is moved to a height position at which the airbag 21 can be supported on the front surface 21c side of the airbag 21 when the inflation is completed. 57 is set so that 57 can be pulled up.

  Further, as shown in FIGS. 2 to 5, a regulation belt 37 is disposed on the rear surface 21 d side of the airbag 21, with the upper end 38 connected to the lower portion 24 a side of the rear wall portion 24 when the inflation is completed. ing. The regulation belt 37 is connected at the lower end 39 side to the rear end 49 b of the bottom wall portion 49 protruding rearward from the peripheral wall portion 50 of the case 48. The regulation belt 37 is formed of a flexible woven fabric such as polyamide or polyester, and an upper end 38 is sewn and connected to the lower portion 24a in the center in the left-right direction of the rear wall portion 24. 39 side is connected with the fixed rod 52 (refer FIG. 2). The regulation belt 37 is formed by folding a single belt-like cloth material in half and arranging a crease on the lower end 39 side to connect the upper end 38 side to the airbag 21. Therefore, the lower end 39 side is formed in a loop shape. A fixing rod 52 is inserted into the loop-shaped lower end 39, and the fixing rod 52 is wound around the fixing rod 52 so that the lower end 39 can swing around the fixing rod 52. 52.

  The length dimension LB (see FIG. 2) of the main body portion 37a between the upper end 38 and the lower end 39 of the regulation belt 37 is such that the restraint surface RP on the rear surface 21d side of the airbag 21 is positioned at the position where the occupant D is received. The length of the air bag 21 is such that it can be placed and the forward movement of the airbag 21 on the side of the upper portion 21a during inflation can be restricted.

  As shown in FIG. 2, the fixing rod 52 is provided with a gap h between the rear wall 49a of the case 48 and the upper surface 49c of the rear end 49b of the bottom wall 49 behind the rear wall 50a. It is fixed to the end 49b. The fixing rod 52 has mounting holes 53 penetrating in the vertical direction in the vicinity of both left and right edges. The fixing rod 52 has a cylindrical collar (not shown) disposed between the fixing rod 52 and the upper surface 49c of the bottom wall portion 49, and the bolt 54 is inserted through the mounting hole 53 and the collar. By tightening to the rear end 49 b of the bottom wall portion 49, a gap h for swinging the lower end 39 of the regulating belt 37 is provided between the upper surface 49 c of the rear end 49 b of the bottom wall portion 49. It is fixedly attached to the rear end 49b.

  As shown in FIGS. 2, 7, and 8, the support member 57 is disposed adjacent to the front side of the case 48, and in the case of the embodiment, the horizontal bar portion 58 that extends in the left-right direction and the horizontal bar portion 58. It is formed from a pipe material having an inverted U-shaped integral structure provided with vertical bar portions 59, 59 extending downward from both left and right ends. In the support member 57, vertical bar portions 59 and 59 are held by a guide sleeve 61 so as to be vertically movable. The guide sleeve 61 is fixed to a bracket (not shown) extending from the frame 3 on the body 2 side.

  The support member 57 is configured such that the width dimension in the left-right direction can protrude upward from between the knee portions KL and KR of the occupant D. In addition, when the airbag 21 that has completed the upward protrusion of the support member 57 is disposed at the support position SP, the position of the upper portion 57a can support the front side of the upper portion 21a of the airbag 21 that has been inflated. In addition, the rear surface 57b side is covered with the upper portion 21a.

  Further, since the support member 57 and the airbag 21 are covered with the cover 14 constituting the front end side of the seat 13 in the stored state, the cover 14 is pushed open when protruding upward. , Projecting upward.

  In manufacturing the airbag 21, first, the upper end 38 of the regulation belt 37 is stitched in advance to a portion of the lower portion 24 a of the rear wall portion 24 of the first base fabric 27, and the ceiling wall of the second base fabric 28 is manufactured. The upper end 32a of the connecting belt 32 is previously stitched to the portion of the front edge 25d of the portion 25 (see FIG. 6). And the part 29a used as the front wall part of the inner bag 30 in the 3rd base cloth 29 is sewn and joined to the center part 23a of the front wall part 23 of the inner peripheral surface side of the airbag 21 in the 1st base cloth 27. . Next, the bottom wall portion 22 of the first base cloth 27 and the third base cloth 29 is drilled so as to provide an inflow opening 22a and a mounting hole 22b. The outlet 30b is drilled. The inflow opening 22a, the attachment hole 22b, and the outlet 30b may be formed in advance in the first base cloth 27 and the third base cloth 29 as appropriate. Further, as shown in FIG. 6, a reinforcing cloth (not shown) may be provided on the periphery of the inflow opening 22 a including the arrangement area of the attachment hole 22 b.

  Thereafter, the third base fabric 29 is folded at the site of the bottom wall portion 22, and the overlapped outer peripheral edges are stitched together to form the inner bag 30. Next, the first base cloth 27 is folded at the bottom wall portion 22, and the left and right left edges 27b are sewn together with the right edges 27c, and the second base cloth 28 is placed on the upper edge 27a side. The airbag 21 can be manufactured by suturing the entire periphery and turning it over using the inflow opening 22a so that the seam allowance is not exposed to the outer peripheral surface side.

  The outline of mounting the airbag device 20 on the two-wheeled vehicle 1 will be described. First, the airbag 21 is folded. This folding is performed so that the front surface 21c side and the rear surface 21d side are overlapped in the front-rear direction in a state where the retainer 41 is housed in the airbag 21 so that each bolt 41a protrudes from the mounting hole 22b. In order to correspond to the width dimension of the case 48 in the left-right direction, a fold along the top-bottom direction is attached, and a left-right reduction fold is performed to reduce the left-right width dimension. Before and after the folding is performed by folding in the left-right direction so that the width dimension is obtained.

  Thereafter, the airbag 21 that has been folded is wrapped with a wrapping material that can be broken so as not to collapse. Incidentally, the connecting belt 32 and the regulating belt 37 have their lower ends 32b and 39 protruding from the wrapping material, and the bolts 41a of the retainer 41 are also protruded from the wrapping material, and further for inflow of the airbag 21. The opening 22a is also opened so that the main body 45 of the inflator 44 can be inserted.

  The airbag 21 that has been folded is accommodated in the case 48 so that each bolt 41a protrudes from the bottom wall portion 49, and the bottom wall of the case 48 is inserted while the bolt 41a is inserted through the flange portion 46. The main body 45 of the inflator 44 is inserted into the openings 49a and 22a from below the portion 49, and the nut 42 is fastened to each bolt 41a.

  Thereafter, the fixing rod 52 is inserted into the loop-shaped lower end 39 of the regulation belt 37, and the bolts 54 are inserted into the left and right mounting holes 53 and the collar (not shown) disposed on the upper surface 49c of the case 48. The bolts 54 are fastened to the bottom wall portion 49 of the case 48, and the fixing rod 52 is fixed to the bottom wall portion 49 of the case 48.

  The case 48 is attached to the bracket 10 using a connection bracket (not shown), and the lower end 32b of the connection belt 32 is attached to the frame 3 using the contact plate 33, the bolt 34, and the nut 35. It connects with the horizontal bar part 58 of the used support material 57. FIG.

  Thereafter, a lead wire for inputting a predetermined operation signal is connected to the inflator 44, and the airbag device 20 can be mounted on the two-wheeled vehicle 1 by mounting the seat 13.

  In the two-wheeled vehicle 1 of this embodiment, when the airbag apparatus 20 is activated by colliding with a four-wheeled vehicle or the like during traveling, the inflator 44 inserted into the inflow opening 22a of the airbag 21 is connected to each gas discharge port. Since the inflation gas is discharged from 45a, the airbag 21 into which the inflation gas has flowed is located between the left and right legs LL and LR of the occupant D seated on the seat 13, as shown in FIGS. The inflated portion of the occupant D that expands and expands upward from the storage portion (case 48) and completes the expansion into a shape that can restrain at least the waist W of the occupant D that moves forward.

  At this time, as shown in FIGS. 9 to 12, even if the airbag 21 is completely inflated with the handle 7 (7L, 7R) largely cut to one side in the left-right direction, at least the grip 8 of the handle 7L. The upper surface 21e side of the airbag 21 at the time of completion of inflation is formed so that the left and right left ends 25a and right end 25b are lowered from the center portion 25c in the left and right direction so that interference with the terminal 8a side of the airbag can be suppressed. Therefore, the airbag 21 is prevented from shifting from the front side of the occupant D while suppressing interference with the terminal 8a side in the grip 8 of the left and right handles 7L, 7R, and is smoothly inflated to the inflated shape. Can do.

  Therefore, in the airbag device 20 according to the embodiment, even if the airbag 21 is inflated with the handles 7L and 7R being largely cut, the airbag 21 that has been stably inflated is removed from the occupant D. It can be placed in front.

  The airbag 21 of the embodiment is inclined so that the upper surface 21e (ceiling wall portion 25) side when the inflation is completed is gradually lowered from the center portion 25c in the left-right direction toward the left and right left ends 25a and the right end 25b. Configured. Therefore, as shown in A and B of FIG. 10 from A and B of FIG. 9, the airbag 21 is connected to the terminal 8a side of the left and right grip 8 of the handle 7 (7L and 7R) in the cut state. Even if the vicinity of the central portion 25c in the left-right direction on the upper surface 21e side interferes, the inclination decreases toward the left-right direction on the upper surface 21e side of the airbag 21 as the airbag 21 rises on the upper surface 21e side. The surface 26 slides as the guide surface with the interfering grip 8, and the portion 25 ac on the center portion 25 c side away from the left end 25 a on the upper surface 21 e side of the airbag 21 is smoothly brought into the front side of the occupant D. The airbag 21 can be smoothly inflated to the inflated shape while being moved rightward so as to be disposed (see a in FIG. 10 and a in FIG. 12).

  Further, in the embodiment, the airbag 21 has a shape spreading from the lower end (lower part) 21b side toward the upper end (upper part 21a) side on the left and right sides in the front view when the inflation is completed. As described above, the projecting top portions 21f and 21g in the left and right direction are arranged at substantially the same height as the terminals 8a of the left and right grips 8 and 8. Therefore, when the airbag 21 is inflated with the handle 7L turned off, as shown in FIGS. 11 and 12, the inclined surface 26 on the upper surface 21e side of the airbag 21 serves as a guide surface and the terminal 8a side of the grip 8. By sliding, the substantially entire area on the upper surface 21e side of the airbag 21 can be disposed between the left and right handles 7L, 7R. At this time, the airbag 21 is positioned at a high position substantially the same height as the terminals 8a of the grips 8 and 8 that are positioned high without reducing the protruding top portions 21f and 21g in the left-right direction when inflation is completed as much as possible. It is arranged, a large volume can be secured, and further, the expansion can be completed in the entire area of the large volume, and a good cushioning property can be secured and the occupant D can be received.

  Moreover, the airbag 21 of the airbag device 20 of the embodiment is an elliptical plate-shaped bag in which a peripheral wall portion (ceiling wall portion) 25 that forms the upper surface 21e side when inflation is completed is provided with a long axis X in the left-right direction. The base fabric (second base fabric) 28 is used (see FIG. 6). That is, the upper surface 21e of the airbag 21 in which the left and right left ends 25a and right ends 25b when the inflation is completed is disposed below the center portion 25c is formed from a single elliptical plate-shaped second base fabric 28. It is possible to easily increase the volume of the airbag 21 so that a wide surface in the front-rear direction can be secured without protruding upward as much as possible, and as a result, cushioning can be improved. It can be secured.

  Further, in the case of the embodiment, the peripheral wall portions of the other airbag 21 of the elliptical plate-shaped ceiling wall portion 25 constituting the upper surface 21e side of the airbag 21 are the rear wall portion 24 on the occupant D side and the front surface 21c side. The front wall portion 23 and the bottom wall portion 22 held by the storage portion (case) 48 are configured. A single bag in which the rear wall portion 24, the front wall portion 23, and the bottom wall portion 22 extend the rear wall portion 24 and the front wall portion 23 with the bottom wall portion 22 therebetween. The base fabric (first base fabric) 27 is formed. Therefore, in the embodiment, the rear wall portion 24 and the front wall portion 23 are overlapped by folding at the site of the bottom wall portion 22 of the first base fabric 27, and the peripheral edges of the left and right left edges 27b and the right edge 27c are sewn together. If the front and rear edges of the ceiling wall portion 25 are stitched to the upper edge 27a side of the rear wall portion 24 and the front wall portion 23, the airbag 21 can be easily manufactured. In this case, the airbag 21 can be comprised from the two base fabrics for bags (the 1st base fabric 27 and the 2nd base fabric 28). In addition, regarding the base fabric for bags which comprises the rear wall part 24, the front wall part 23, and the bottom wall part 22, you may comprise not only one sheet but two sheets or three sheets.

  Furthermore, in the airbag device 20 of the embodiment, the airbag 21 can be accommodated on the rear side of the stem shaft 5 to support the front surface 21c side of the airbag 21 when the inflation is completed, and the airbag when expanded. A support member 57 that is pulled up from the storage portion (case) 48 by 21 is disposed on the front surface 21 c side of the airbag 21. Therefore, when the airbag 21 is inflated, the support member 57 is pulled up from the storage part (case) 48 along with the completion of the inflation of the inner bag 30 and the inflation of the upper end (upper part) 21a of the airbag 21. The air bag 21 at the time is supported by the support member 57 on the front surface 21c side, and therefore, when the occupant D is received, the front airbag 21c is not moved forward, and a good cushioning property can be secured and the occupant D can be received. . And since the airbag 21 itself can suppress the interference with the terminal 8a side of the grip 8 in the handles 7L and 7R in the cut state, the airbag 7 itself can be smoothly inflated to the upper end (upper) 21a side. , 7R can be pulled up stably, and the support material 57 can be pulled up stably, and in the state supported by the support material 57, a good cushioning property can be secured and the occupant D can be received. it can.

  By the way, in the case of the embodiment, the inner bag 30 is at a height position up to the vicinity immediately below the upper edge 23b of the front wall portion 23, and the upper end 32a of the connecting belt 32 is stitched to the front edge 25d of the ceiling wall portion 25. The support position SP at the highest position where the support member 57 is pulled up is the position at which the support member 57 is lifted when the inner bag 30 itself completes expansion and the upper portion 21a of the airbag 21 completes expansion. (See B in FIG. 7 and B in FIG. 10). Therefore, it is desirable that the airbag 21 is smoothly inflated to the upper end (upper) 21a side. If the inflation is not completed to the upper end (upper) 21a side, the lifting position of the support member 57 is lowered. Therefore, the support performance of the inflated airbag 21 by the support material 57 is lowered, and it is not preferable because sufficient occupant protection performance of the inflated airbag 21 cannot be secured.

  9 to 12 show the case where the airbag 21 is inflated with the handles 7L and 7R cut to the left, but the air with the handles 7L and 7R cut to the right When the bag 21 is inflated, the airbag 21 is merely symmetrical with the state shown in FIGS. 9 to 12, and the same actions and effects as described above can be obtained.

  Further, the support member 57 is not formed from an inverted U-shaped pipe member having an integrated structure that can be reduced in weight as in the embodiment, but is formed by connecting rods such as a plurality of pipe members having rigidity such as a pipe member. Or may be formed from a plate material such as metal.

  Furthermore, in the airbag device 20 of the embodiment, the case where the airbag 21 is inflated on the rear side of the stem shaft 5 has been shown. However, the head 21 of the occupant D can be received at the front of the stem shaft 5 during operation. The airbag device may be configured to inflate the airbag on the side.

  Further, in the case of the illustrated example, the case where the airbag device 20 is mounted on the scooter type motorcycle 1 is shown. However, the airbag device of the present invention is mounted on other motorcycles such as sports bike types. Also good.

1 ... (auto) motorcycles,
5 ... Stem shaft,
7 (7L, 7R) ... handle,
8 ... grips,
8a ... terminal,
20 ... (for motorcycles) airbag device,
21 ... Airbag,
21a (upper end),
21b ... (lower end) lower part,
21c ... front,
21e ... upper surface,
21f, 21g ... protruding top,
25 ... ceiling wall,
25a ... Left end,
25b ... right end,
25c ... Central part,
28 ... (Bag base fabric) Second base fabric,
57 ... support material,
D ... Crew.

Claims (2)

An air bag that protects an occupant is inflated upward from the storage part on the front side or rear side of the stem shaft that has a handle that extends to the left and right sides at the upper end when the inflation gas flows in. With a configuration that allows
The airbag for a motorcycle configured to be disposed so as to overlap at least a grip terminal side of one of the left and right handles when the handle is cut in a state in plan view when the inflation is completed A device,
The airbag is
It is possible to suppress interference with the terminal side of the grip in the handle when cutting,
The upper surface of the completely inflated, causes disposed lowered left and right both end side from the center portion of the position in the lateral direction, so as to decrease gradually from the central portion in the lateral direction on both end sides of the right and left, in an inclined, constitutes ,
In the state of the front view when the expansion is completed, as a shape spreading from the lower end side on the storage site side toward the upper end side on both the left and right sides, the protruding tops in the left and right directions are at substantially the same height as the terminals of the left and right grips, Configured to arrange,
The part of the peripheral wall at the completion of expansion
It is composed of a ceiling wall part that forms the upper surface side, a rear wall part on the passenger side, a front wall part on the front surface side, and a bottom wall part that is held in the storage part,
From the single bag base fabric that extends the rear wall portion and the front wall portion with the rear wall portion, the front wall portion, and the bottom wall portion interposed therebetween. Formed from a first base fabric, and the ceiling wall portion is formed from a second base fabric made of an elliptical plate-shaped base fabric for bags having a long axis in the left-right direction,
Fold at the bottom wall portion of the first base fabric to overlap the rear wall portion and the front wall portion, and sew the peripheral edges of the left and right edges between the rear wall portion and the front wall portion. On the upper edge side, the front and rear edges of the ceiling wall portion of the second base fabric are sewn,
An airbag device for a motorcycle characterized by being formed . The airbag is housed on the rear side of the stem shaft,
A support material capable of supporting the front side of the airbag when inflation is completed and being pulled up from the storage part by the airbag when inflated is disposed on the front side of the airbag. The motorcycle airbag device according to claim 1 .

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