JP2017119486A - Air bag for bike - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air bag for a bike, which is able to make its capacity compact while ensuring protection performance for a driver.SOLUTION: An air bag for a bike is folded and stored in a stored part 41 located below handles 11 on the front side of the seat 23 of the bike 1, and inflates and expands rearwards from the stored part when expansion gas G is caused to flow into the air bag. A shape after expansion is completed, includes: an approximately rectangular front wall part 62 having a mount part 62c mounted on a mounting seat 42c of the stored part; a rear wall part 64 that is able to receive a belly part B and chest part C below the jaw J of a driver D and that is disposed opposite the front wall part in forward and backward directions and approximately in parallel to it; and a peripheral wall part 66 of approximately square cylindrical shape. The shape is approximately truncated quadrangular pyramid, in which the length dimension of the rear wall part is made longer than that of the front wall part in a vertical direction. The front wall part arranges the mount part 62c on a peripheral edge of an inflow opening 62a for causing expansion gas to flow in, and disposes it lower than an intermediate part of the front wall part in the vertical direction.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a motorcycle air that is folded and stored in a storage portion below a handle on the front side of a motorcycle seat such as a scooter and expands and expands rearward from the storage portion when inflating gas flows. Regarding the bag.

  2. Description of the Related Art Conventionally, a motorcycle airbag has a configuration in which it is folded and stored in a storage portion below a handle on the front side of a motorcycle seat, and is expanded and inflated rearward from the storage portion when an inflating gas flows. (For example, see Patent Documents 1 and 2).

JP 2003-011871 A JP-A-2005-008055

  However, a conventional motorcycle airbag has a shape that extends in a column shape in the vertical direction so that the abdomen, chest, and head of the driver seated on the seat can be received when the inflation is completed. The volume (internal capacity) was increased so that the cross section surrounding and covering the upper body from the front side was U-shaped.

  For this reason, an inflator or the like for supplying the inflation gas to the storage part or the airbag becomes bulky, and an airbag capable of reducing the volume while ensuring the protection performance of the driver has been desired.

  The present invention solves the above-described problems, and an object of the present invention is to provide a motorcycle airbag that can be compact in volume while ensuring the protection performance of the driver.

A motorcycle airbag according to the present invention is folded and stored in a storage portion disposed at a position below a handle on the front side of a motorcycle seat, and is disposed along a substantially vertical direction in the storage portion. A motorcycle airbag having a structure that is attached to a mounting seat of the mounting wall portion and that expands and expands rearward from the storage portion when the inflation gas flows in,
As the expansion completion shape,
A substantially rectangular front wall portion having an attachment portion attached to the attachment seat of the storage portion;
A substantially rectangular rear wall portion that can be configured as a restraining portion that receives the abdomen and chest under the driver's chin, is opposed to the front wall portion in a substantially front-rear direction, and is disposed substantially parallel to the front wall portion. When,
An upper wall, a lower wall, a left wall, and a substantially square cylindrical peripheral wall having a right wall, extending forward from the upper, lower, left and right edges of the outer peripheral edge of the rear wall;
With
The length of the rear wall from the lower edge on the lower wall portion side to the upper edge on the upper wall portion side is determined from the lower edge on the lower wall portion side of the front wall portion to the upper side on the upper wall portion side. It has a substantially square frustum shape that is longer than the length to the edge,
The front wall portion is configured such that the attachment portion is disposed at the periphery of the inflow opening for allowing the inflation gas to flow in, and disposed below the intermediate portion in the vertical direction of the front wall portion. It is characterized by being.

  In the airbag for a motorcycle according to the present invention, the shape of the completed inflation is set so that the outer peripheral edges of the front wall portion below the handle and the rear wall portion capable of receiving and receiving the abdomen and chest below the driver's chin are It is made into the substantially square frustum shape connected with the surrounding wall part of the substantially square cylinder shape which has the wall part, the upper wall part, the left side wall part, and the right side wall part. That is, in the motorcycle airbag according to the present invention, the rear wall portion has a small area capable of receiving the abdomen and chest below the driver's chin, and the inflated shape has a height up to the upper edge. Since the substantially square frustum shape narrows from the rear wall portion with the increased size to the front wall portion with the reduced height size, the volume of the entire airbag can be made as small as possible.

  The airbag at the time of completion of the inflation is arranged such that the rear wall portion is opposed to the front wall portion along the substantially vertical plane in the front-rear direction and substantially parallel to the front wall portion. However, when trying to move forward by receiving the abdomen and chest of the driver moving forward, it is disposed along a substantially vertical plane that faces the rear wall portion in a substantially front-rear direction and is substantially parallel to the rear wall portion. The front wall portion is supported by the mounting wall portion of the storage portion and the vehicle body side portion around the storage portion, and the airbag is immediately attached to the mounting wall portion of the storage portion and the vehicle body side portion around the storage portion. By receiving the reaction force from the driver, the driver can be accurately received and protected.

  A mounting portion at the periphery of the inflow opening for allowing the inflating gas to flow in is disposed below the intermediate portion in the vertical direction of the front wall, and the airbag is inflated from the inflow opening. Is expanded and expanded to the rear side in the diagonally upward direction. Therefore, at the initial stage of deployment and inflation, the airbag can be quickly received from the chest to the abdomen of the driver who moves forward without interfering with the seat, which can contribute to improving the protection performance of the driver.

  Furthermore, if the attachment portion at the periphery of the inflow opening for allowing the inflation gas to flow in is disposed below the intermediate portion in the vertical direction of the front wall portion, the rear wall portion receives the driver, Even if the airbag tries to roll the rear wall obliquely upward and forward with the mounting portion as a fulcrum, the area of the upper portion above the mounting portion of the front wall portion is wide, and the upper portion of the wide area is stored. Rolling can be prevented by being supported by the mounting wall portion of the part or the vehicle body side part above the part, and the airbag can stably receive and protect the driver.

  Therefore, in the motorcycle airbag according to the present invention, the volume can be made compact while ensuring the protection performance of the driver.

And in the airbag for motorcycles according to the present invention, the airbag at the completion of the inflation is
While narrowing the width dimension in the left-right direction from the left and right grip parts of the handle,
It is preferable that the upper wall portion is set to a size that can be supported by contacting the portion of the handle between the left and right grip portions at least when the driver of the rear wall portion is received.

  In such a configuration, when the airbag is completely inflated, the airbag does not interfere with the left and right arms of the driver who grips the grip portion of the handle, and the posture of gripping the driver's handle can be stabilized. In addition, when the rear wall portion receives the driver, the rear wall portion receives the driver, and even if the airbag tries to roll the rear wall portion obliquely upward and forward with the mounting portion as a fulcrum, the upper wall portion Since the steering wheel hits and the airbag is prevented from rolling, the airbag can stably receive and protect the driver.

  Further, in the motorcycle airbag according to the present invention, it is desirable that a tether for connecting the left side wall part and the right side wall part when the inflation is completed is disposed.

  In such a configuration, since the size of the airbag in the left-right direction during inflation is regulated by the tether, it is possible to suppress the interference of the airbag with the left and right arms of the driver holding the handle grip portion. Thus, the posture of gripping the driver's handle can be stabilized.

It is a side view of the motorcycle carrying the airbag apparatus using the airbag of embodiment which concerns on this invention. It is a schematic partial longitudinal cross-sectional view along the front-back direction of the airbag apparatus of embodiment. It is the schematic perspective view which expanded the air bag of an embodiment alone. It is the schematic side view which inflated the airbag of the embodiment alone. It is the schematic plan view which expanded the airbag of the embodiment alone. It is a schematic longitudinal cross-sectional view of the airbag of embodiment, and respond | corresponds to the VI-VI site | part of FIG. It is a figure explaining the folding process of the airbag of an embodiment in order. It is a figure explaining the folding process of the airbag of an embodiment in order, and shows the process after C of Drawing 7. It is a schematic longitudinal cross-sectional view which shows the time of the action | operation of the airbag apparatus of embodiment in order. It is a schematic longitudinal cross-sectional view which shows the time of the action | operation of the airbag apparatus of embodiment in order, and shows the state after B of FIG. It is a schematic plan view which shows the time of the action | operation of the airbag apparatus of embodiment. It is a schematic side view explaining the state in which the airbag apparatus of embodiment receives a driver | operator.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, an airbag 60 according to the embodiment is used in a motorcycle airbag device 40. 40 is simply mounted on the lower side of the handle 11 on the front side of the seat 23 in the scooter 1 as a motorcycle. Specifically, the airbag device 40 is disposed in the vicinity of a position immediately below the central portion 14 (see FIG. 11) in the left-right direction of the handle 11 slightly above the upper surface 23a of the main seat 23 on which the driver D is seated. . In other words, the airbag device 40 is disposed at a height position between the upper surface 23 a of the main seat 23 and the central portion 14 of the handle 11.

  The airbag device 40 is fixed to the head pipe 4 as the body frame 3 of the motorcycle 1 and the down frame portions 5L and 5R that branch from the head pipe 4 to the left and right and extend downward using the mounting bracket 7. Has been.

  In the motorcycle 1, an operation shaft 15 connected to the central portion 14 of the handle 11 so as to extend downward is inserted through the head pipe 4 and connected to a front fork 27 that suspends a front wheel 26. Further, rear frame portions 6L and 6R extending rearward are connected to the down frame portions 5L and 5R, and a lower cover 24 and a seat 23 are attached to and supported by the rear frame portions 6L and 6R. The rear wheel 29 is also supported and disposed through an engine, a drive mechanism, an oil supply mechanism, a suspension, and the like.

  As shown in FIGS. 1 and 11, the handle 11 includes a left side portion 12L and a right side portion 12R extending upward from a central portion 14 extending in the left-right direction and extending left and right, and tips of the left side portion 12L and the right side portion 12R. Further, a left grip portion 13L and a right clip portion 13R that the driver D grips during operation are provided. The space between the left grip portion 13L and the right clip portion 13R is covered with a handle cover 18, and the vicinity of the head pipe 4 is covered with a front cover 19 and a rear cover 20. The lower end of the rear cover 20 is connected to the foot board 21. The handle cover 18, the front cover 19, the rear cover 20, the footboard 21 and the like are supported by the down frame portions 5L and 5R and the rear frame portions 6L and 6R using a predetermined stay.

  The handle 11 is configured by disposing a handle main body 11a made of a metal pipe inside the left and right grip portions 13L, 13R, and the operating shaft 15 is connected and fixed to the handle main body 11a of the central portion 14. In addition, the handle cover 18 covers the periphery of the handle body 11a except for the vicinity of the left and right grip portions 13L and 13R.

  As shown in FIG. 2, the airbag device 40 includes an airbag 60 that inflates by inflating the inflation gas G, an inflator 52 that supplies the inflation gas G to the airbag 60, and a folded airbag 60. A case 41 serving as a storage part for storing the airbag, and an airbag cover 46 covering the folded airbag 60 are provided.

  The case 41 as a storage part is made of sheet metal and includes a substantially rectangular mounting wall portion 42 and a peripheral wall portion 43 that extends from the outer peripheral edge of the mounting wall portion 42 to the rear side in a square tube shape. . The mounting wall portion 42 is formed in a substantially rectangular plate shape extending in the left-right direction so as to be along a substantially vertical plane that is inclined with the upper edge 42f side disposed forward. The inclination angle θ of the mounting wall portion 42 from the vertical plane VP is 10 °.

  In addition, the mounting wall portion 42 has a through hole 42a opened in a circular shape at the center, and four mounting holes 42b are disposed at the periphery of the through hole 42a. A portion where the mounting hole 42b on the periphery of the through hole 42a is disposed forms a mounting seat 42c for the airbag 60. In addition, a body portion 53 described later of the inflator 52 is penetrated through the through hole 42a, and a bolt 57 of a retainer 56 described later is penetrated through each mounting hole 42b.

  A plurality of locking claws 44 for holding the airbag cover 46 are formed on the upper and lower edges on the distal end side of the peripheral wall portion 43. Each locking claw 44 is formed so as to be reversed to the front side, and is inserted into a locking hole 50 a of a side wall 50 described later of the airbag cover 46 to lock the side wall 50. A through hole 43 a for a rivet (blind rivet) 51 is formed at a predetermined position of the peripheral wall portion 43.

  The case 41 includes a bracket portion 45 that is connected and fixed to the mounting bracket 7 using bolts 8, and is connected to and supported by the down frame portions 5 </ b> L and 5 </ b> R as the vehicle body frame 3 via the mounting bracket 7. Will be. The bracket portion 45 is provided with a nut 45 a for fastening the bolt 8.

  The airbag cover 46 is formed of a synthetic resin such as an olefin-based thermoplastic elastomer, and has a cover wall portion 47 exposed from the rear cover 20 and a rectangular tube shape forward from the back side (front side) of the cover wall portion 47. And a protruding side wall 50. The side wall 50 is formed with a locking hole 50 a for inserting the locking claw 44 of the case 41 described above and a through hole 50 b for the rivet 51. In the embodiment, the portion on the upper side of the side wall portion 50 is formed so as to continuously extend from the upper edge side of the cover wall portion 47 to the front side.

  Further, the cover wall portion 47 is formed with door portions 48 (48U, 48D) that are pushed up by the inflating airbag 60 and open up and down. Around each door portion 48, a thin breakage portion 49 is formed that is disposed in a substantially H shape when viewed from the rear. When the planned break portion 49 breaks, each door portion 48U, 48D is configured to open up and down with the hinge portion 48a of the corresponding upper edge and lower edge as the center of rotation.

  The inflator 52 includes a cylindrical main body portion 53 and a flange portion 54 having a substantially square plate shape with four corners protruding on the outer peripheral surface side of the main body portion 53. The main body 53 is configured by disposing a plurality of gas discharge ports 53a on the outer periphery on the rear end side along the axial direction substantially in the front-rear direction, and the flange portion 54 has mounting holes 54a penetrating at four corners. Yes. The inflator 52 is disposed with the gas discharge port 53a side disposed on the rear side, and the main body portion 53 is inserted through the through hole 42a of the mounting wall portion 42 of the case 41 so as to penetrate from the front side to the rear side. The flange portion 54 is brought into contact with the front surface side of the mounting wall portion 42 of the case 41 while the bolts 57 of the retainer 56 are inserted into the mounting holes 54 a, and the nuts 58 are fastened to the bolts 57. Thus, it is fixedly attached to the mounting wall portion 42 of the case 41.

  The retainer 56 is for attaching the inflator 52 and the airbag 60 to the attachment wall portion 42 of the case 41, is made of sheet metal, and has a circular opening through which the main body portion 53 of the inflator 52 can be inserted. As a quadrangular ring provided with the insertion hole 56a, bolts 57 projecting forward are arranged at the four corners. Each bolt 57 passes through a later-described through hole 62 b of the airbag 60, an attachment hole 42 b of the attachment wall portion 42 of the case 41, and an attachment hole 54 a of the flange portion 54 of the inflator 52, and a nut 58 is fastened. Thus, the flange portion 54 of the inflator 52 and a mounting portion 62c described later of the airbag 60 are fixedly attached to the mounting wall portion 42 of the case 41.

  As shown in FIGS. 3 to 6, the airbag 60 has a substantially square frustum shape that is narrowed from the large substantially rectangular rear wall portion 64 toward the front small rectangular front wall portion 62 as the inflation completed shape. . The peripheral wall portion 66 that connects the outer peripheral edges of the rear wall portion 64 and the front wall portion 62 has a substantially rectangular tube shape, and has upper, lower, left and right edges 64eu, 64ed, 64el, An upper wall portion 67, a lower wall portion 68, a left wall portion 69, and a right wall portion 70 that extend forward from 64er are provided. That is, the upper wall portion 67 is disposed so as to connect the upper edges 64 eu and 62 eu of the rear wall portion 64 and the front wall portion 62, and the lower wall portion 68 is disposed below the rear wall portion 64 and the front wall portion 62. The left wall portion 69 is disposed so as to connect the left edges 64el, 62el of the rear wall portion 64 and the front wall portion 62, and the right wall portion 70 is The rear wall portion 64 and the right edge 64er of the front wall portion 62 are arranged so as to connect each other.

  The substantially rectangular front wall 62 includes an inflow opening 62a that is opened in a circular shape to allow the inflation gas G to flow in, and a through hole 62b that allows each bolt 57 of the retainer 56 to pass through the periphery of the inflow opening 62a. Is disposed. The part in which the through hole 62b at the periphery of the inflow opening 62a is provided constitutes an attachment part 62c attached to the attachment seat 42c of the case 41 as a storage part.

  And although the attaching part 62c is a center part of the left-right direction of the front wall part 62, it is substantially 1 in the downward side from the intermediate part of the up-down direction of the front wall part 62, and the lower side of the front wall part 62 in the embodiment. / 3 area. More specifically, the lower edge 62ed of the front wall portion 62 is disposed so as to coincide with the lower side 62cd of the attachment portion 62c pressed by the square annular retainer 56.

  In addition, a reinforcing cloth 73 is disposed on the attachment portion 62c in order to increase heat resistance.

  The substantially rectangular rear wall portion 64 constitutes a restraining portion 64a that receives the abdominal portion B and the chest portion C below the chin J of the driver D, and when the airbag 60 is completely inflated, the central portion is slightly rearward. Although inflated, the front wall 62 is opposed to the front wall 62 substantially in the front-rear direction, and is disposed substantially parallel to the front wall 62.

  The length dimension BT from the lower edge 64ed on the lower wall portion 68 side of the rear wall portion 64 to the upper edge 64eu on the upper wall portion 67 side is higher than the lower edge 62ed on the lower wall portion 68 side of the front wall portion 62. It is longer than the length dimension FT to the upper edge 62eu on the wall 67 side (see FIG. 6).

  In the case of the embodiment, the length dimension BT of the rear wall 64 when the airbag 60 is completely inflated is about 350 mm, and the length dimension FT of the front wall 62 is about 250 mm. Furthermore, the longitudinal dimension L0 of the airbag 60 is about 400 mm.

  The width dimensions BW and FW in the left-right direction of the rear wall portion 64 and the front wall portion 62 are about 300 mm (see FIG. 5).

  In addition, when the airbag 60 is completely inflated with the vehicle mounted, the width dimension W0 in the left-right direction at the most inflated portion of the airbag 60 is set to about 350 mm, and between the left and right grip portions 13L, 13R of the handle 11. The width W1 is narrower and smaller than about 450 mm (see FIGS. 5 and 11).

  Furthermore, at least when the driver D receives the rear wall portion 64, the upper wall portion 67 is set to a size that can be supported by contacting the portion of the handle 11 between the left and right grip portions 13L, 13R. That is, the front upper surface 67a of the upper wall portion 67 is an area extending from the rear surface side to the lower surface side in the vicinity of the grip portions 13L and 13R of the central portion 14, the left portion 12L, and the right portion 12R of the handle 11, or downward from the central portion 14. The height of the front end portion 60a of the airbag 60 is set so as to be in contact with and supported by the support surface 11b such as the rear surface 17a of the central shaft portion 17 extending in the direction.

  In the airbag 60, a tether 72 that connects the left side wall 69 and the right side wall 70 when the inflation is completed is disposed. The tether 72 is composed of two tether cloths 72a and 72a in a band shape with the width direction extending in the front-rear direction, and an outer edge 72b sewn to the left wall part 69 and the right wall part 70 of each tether cloth 72a. , 72b away from the inner edges 72c, 72c. With the tether 72, when the inflation in the vehicle mounted state is completed, the airbag 60 has a width dimension W0 in the left-right direction at the most inflated portion, based on a width dimension W1 between the left and right grip portions 13L, 13R of the handle 11. It is structured stably and narrowly.

  The outer peripheral wall 61 of the airbag 60 is the same as the base fabric that forms the tether cloth 72a and the reinforcing cloth 73. However, the outer peripheral wall 61 is made of a predetermined shape of an airbag base cloth woven by plain weaving such as polyamide or polyester yarn. It is configured. When the tether cloth 72a and the reinforcing cloth 73 are disposed, and the predetermined stitching portions of the airbag base cloth having a predetermined shape are sewn together while forming the inflow opening 62a and the through hole 62b, the front wall An outer peripheral wall 61 including a portion 62 and a rear wall portion 64, and further including an upper wall portion 67, a lower wall portion 68, and a peripheral wall portion 66 including left and right side wall portions 69, 70. The airbag 60 can be manufactured.

  And when the manufactured airbag 60 is folded, it folds as follows. First, as shown in A of FIG. 7, a fold 91 along the left-right direction is attached to an intermediate portion in the vertical direction of the rear wall portion 64, and the rear wall portion 64 is folded in two. The fold 92 along the left-right direction is attached to the vicinity of the front wall portion 62, and the front wall portion 62 is folded on the upper wall portion 67 to form the initial folding bag 90. In the initial folding bag 90, the left and right side wall portions 69 and 70 are folded between the upper wall portion 67 and the lower wall portion 68.

  Next, as shown in FIGS. 7B and 7C, the fold 93D along the left-right direction is attached to the lower wall portion 68, and the fold 93F along the left-right direction is attached to the front wall portion 62, so that the front wall portion 62 The site | part of the attaching part 62c is arrange | positioned on the lower surface side. Next, as shown in FIGS. 8A to 8C, the front end 94 on the rear wall portion 64 side is wound on the upper wall portion 67 side, and the roll-folded folding portion 95 is disposed on the upper side of the attachment portion 62c. Then, as shown in FIGS. 8C and 8D, when the left and right edges 97 and 98 are folded so as to be disposed above the attachment portion 62c, the airbag folding completed body 100 can be formed.

  When the airbag 60 is folded, the retainer 56 is disposed on the attachment portion 62c in a state where the bolts 57 protrude from the through holes 62b.

  The airbag 60 folded as described above is wrapped with a wrapping sheet for preventing collapse, and the bolts 57 are passed through the mounting holes 42b of the case 41 and stored in the case 41. Further, the main body 53 of the inflator 52 is inserted into the airbag 60 through the through hole 42a of the case 41, the insertion hole 56a of the retainer 56, and the inflow opening 62a of the airbag 60. If the bolts 57 of the retainer 56 are passed through the mounting holes 54 a and the nuts 58 are fastened to the bolts 57, the inflator 52 and the airbag 60 can be fixedly mounted on the mounting seat 42 c of the mounting wall portion 42 of the case 41. it can.

  Thereafter, the side wall portion 50 of the airbag cover 46 is placed on the outer peripheral side of the peripheral wall portion 43 of the case 41, and each locking claw 44 of the case 41 is inserted into the corresponding locking hole 50 a of the airbag cover 46, If the side wall portion 50 of the airbag cover 46 is locked to each of the locking claws 44, and the rivet 51 is inserted into the predetermined through holes 43a, 50b, and the side wall portion 50 and the peripheral wall portion 43 are fastened, The airbag device 40 can be assembled.

  The airbag device 40 assembled in this manner uses the bolt 8 that is fastened to the nut 45a while connecting the operation signal input line extending from the predetermined control circuit to the inflator 52, and the bracket portion of the case 41. If 45 is attached to the attachment bracket 7, it can be mounted on the scooter 1.

  Even if the scooter 1 on which the airbag device 40 is mounted collides with an obstacle such as another vehicle while traveling and the driver D tries to move forward on the seat 23, the airbag device 40 is operated and the driving is performed. Person D can be protected. That is, as shown in A and B of FIG. 9 and A and B of FIG. 10, when the inflator 52 is activated and the inflation gas G is discharged from the gas discharge port 53 a (see FIG. 2), the airbag 60. Is inflated by the inflation gas G, pushes and opens the doors 48, 48 of the airbag cover 46, expands and inflates from the lower side of the handle 11 to the rear side, and the rear wall 64 is below the chin J of the driver D. Since the driver D moving forward is made to face the chest C and the abdomen B, the abdomen B and the chest C are received by the rear wall 64 as the restraint 64a of the airbag 60, and the obstacle Protected without contact.

  In the airbag 60 of the embodiment, the inflation completion shape is such that the front wall 62 below the handle 11 and the rear wall 64 that can receive the abdomen B and the chest C under the chin J of the driver D. The outer peripheral edges of each other are connected by a substantially rectangular tubular peripheral wall 66 (see FIGS. 3 to 6) having a lower wall portion 68, an upper wall portion 67, a left side wall portion 69, and a right side wall portion 70. It has a substantially square frustum shape. In other words, in the airbag 60 of the embodiment, the rear wall 64 receives the abdomen B and the chest C below the chin J of the driver D so as to exclude the head H side including the chin J of the driver D. It has a small possible area, and its expansion completion shape is such that it narrows from the rear wall part 64 with the height dimension BT up to the upper edge 64eu to the front wall part 62 side with a small height dimension FT. Due to the square frustum shape (see FIG. 6), the entire volume of the airbag 60 can be made as small as possible.

  In the case of the embodiment, the volume (capacity) of the airbag 60 is about 50 liters (specifically, 48 liters). Incidentally, a conventional motorcycle airbag generally has a volume of 100 to 150 liters. Further, in the embodiment, the internal pressure of the airbag 60 at the completion of the inflation is set as high as 50 kpa, and even if the airbag 60 has a small volume, the driver D who moves forward is a large person with a heavy weight. Even if it exists, the movement amount can be suppressed and the airbag 60 at the completion of the inflation can receive the driver D.

  The airbag 60 at the time of completion of the inflation is arranged such that the rear wall 64 faces the front wall 62 along the substantially vertical plane in the front-rear direction and is substantially parallel to the front wall 62. When the rear wall portion 64 receives the abdomen B and the chest C of the driver D that moves forward and tries to move forward, the rear wall portion 64 faces the rear wall portion 64 substantially in the front-rear direction and is substantially the same as the rear wall portion 64. A front wall portion 62 disposed along a substantially parallel vertical plane is supported by the vehicle body side portion 2 such as the mounting wall portion 42 of the case 41 as a storage portion or the handle cover 18 around the case 41, and the air The bag 60 immediately receives the reaction force from the vehicle body side part 2 such as the mounting wall portion 42 of the case 41 and the handle cover 18 around the case 41, and can accurately receive and protect the driver D. it can.

  A mounting portion 62c at the periphery of the inflow opening 62a for allowing the inflating gas G to flow in is disposed below the intermediate portion in the vertical direction of the front wall portion 62, and the airbag 60 is provided for inflow. When the expansion gas G is introduced from the opening 62a and expands and expands, it expands and expands toward the rear side in the diagonally upward direction (see A and B in FIG. 9 and A in FIG. 10). Therefore, the airbag 60 can be quickly received from the chest C to the abdomen B of the driver D moving forward without interfering with the seat 23 at the initial stage of deployment and inflation, and the protection performance of the driver D is improved. Can contribute.

  Furthermore, if the attachment portion 62c at the periphery of the inflow opening 62a for allowing the inflation gas G to flow in is disposed below the intermediate portion in the vertical direction of the front wall portion 62, the rear wall portion 64 operates. Even if the airbag 60 receives the person D and tries to roll the rear wall 64 obliquely upward and forward with the mounting portion 62c as a fulcrum, the area of the upper portion 62d above the mounting portion 62c of the front wall 62 The upper portion 62d having a large area is supported by the vehicle body side portion 2 such as the mounting wall portion 42 of the case 41 and the handle cover 18 on the upper side thereof to prevent rolling, and the airbag 60 is stable. Thus, the driver D can be received and protected.

  Therefore, in the airbag 60 of the embodiment, the volume can be made compact while ensuring the protection performance of the driver D.

  In the airbag 60 of the embodiment, when the inflation is completed, the width dimension W0 in the left-right direction is made narrower than the left and right grip portions 13L and 13R of the handle 11, and at least when the driver D of the rear wall portion 64 is received. A front upper surface 67a of the upper wall portion 67 is set to a size that allows the wall portion 67 to be supported by contacting a portion of the handle 11 between the left and right grip portions 13L and 13R (see FIGS. 5 and 11).

  Therefore, in the embodiment, when the inflation of the airbag 60 is completed, the airbag 60 does not interfere with the left and right arms AL and AR of the driver D holding the grip portions 13L and 13R of the handle 11, and the handle 11 of the driver D is The gripping posture can be stabilized. Further, when the rear wall portion 64 receives the driver D, the rear wall portion 64 receives the driver D, and the airbag 60 rolls the rear wall portion 64 obliquely upward and forward with the mounting portion 62c as a fulcrum. (Refer to the solid line from the two-dot chain line in FIG. 12), the handle 11 can be supported in a strong contact with the upper wall portion 67, and the airbag 60 can be prevented from rolling. The driver D can be received and protected.

  In the embodiment, the airbag 60 has the front upper surface 67a of the upper wall portion 67 from the lower surface side to the rear surface side of the left side portion 12L and the right side portion 12R of the handle 11 and the central axis of the handle 11 after the inflation is completed. It is comprised so that it may contact | abut to the support surface 11b which consists of the rear surface 17a of the part 17, and the rolling of the airbag 60 can be prevented stably.

  And in the airbag 60 of embodiment, the tether 72 which connects the left side wall part 69 and the right side wall part 70 at the time of completion of expansion | deployment is arrange | positioned.

  Therefore, in the embodiment, the tether 72 restricts the size of the airbag 60 in the left-right direction at the time of inflation, so that the driver D holding the grip portions 13L, 13R of the handle 11 has left and right arms AL, AR. The interference of the airbag 60 can be suppressed, and the posture of the driver D holding the handle 11 can be stabilized.

  Furthermore, in the airbag 60 of the embodiment, in the folding process, the rear wall 64 is attached to the fold 91 and folded up and down, and the rear wall 64 side is roll-folded on the upper wall 67 side. Yes.

  Therefore, at the initial stage of deployment and inflation of the airbag 60, as shown in FIGS. 9A and 9B, the rear wall 64 side is inclined from the case 41 so that the interference with the seat 23 can be suppressed so as to be unfolded. As shown in FIGS. 10A and 10B, the rear wall 64 that has been folded in two up and down eliminates the crease 91 and promptly drives the chest C of the driver D. Since it expands along a substantially vertical plane so as to face the abdomen B and the abdomen B, it becomes possible to quickly receive the chest C and the abdomen B of the driver D using the entire surface as the restraint part 64a.

  Further, in the airbag 60 of the embodiment, in order to regulate the width dimension W0 in the left-right direction so that the airbag 60 at the completion of inflation does not interfere with the left and right arms AL, AR of the driver D, the tether 72 is Since it is only disposed along the left-right direction and not along the front-rear direction, the rearward movement on the rear wall 64 side in the initial stage of expansion and expansion is performed quickly. The restraint of the driver D by the rear wall portion 64 is promoted.

  Furthermore, in the airbag 60 of the embodiment, the mounting wall portion 42 of the case 41 having the mounting seat 42c to which the mounting portion 62c is mounted shifts the upper edge 42f forward, and the inclination angle θ is 10 ° from the vertical plane VP. Is disposed. Therefore, the airbag 60 at the time of completion of the inflation is provided with a front wall portion 62 having an inclination angle θ, substantially parallel to the front wall portion 62, and opposed to the front wall portion 62 in the front-rear direction. The portion 64 is also disposed with an inclination angle θ.

  Therefore, when the airbag 60 is deployed and inflated from the case 41 as a storage part, the airbag 60 is folded and stored immediately below the central portion 14 of the handle 11 between the upper surface 23a of the seat 23 and the handle 11. However, the airbag 60 that inflates from the mounting seat 42c that has an inclination angle θ (10 °) from the vertical plane VP and is slightly upward is deployed and inflated obliquely rearward and upward perpendicular to the mounting seat 42c. As a restraining portion 64a that enters the upper side 23a of the seat 23 and between the left and right thighs FL, FR of the driver D without interfering with the seat 23, and restrains the driver D. The rear wall portion 64 can be directly opposed to the abdomen B side of the driver D.

  In the airbag 60 of the embodiment, the vertical length BT of the rear wall 64 at the completion of inflation is about 350 mm, and the horizontal width BW of the rear wall 64 is about 300 mm. In order to cope with the driver D who is large and small, such as male (AM50) and standard female (AF50), that is, the interference with the arms AL, AR and the thigh FL, FR is suppressed, and preferably If the driver D can be received, the vertical dimension BT of the rear wall 64 at the completion of the expansion is in the range of 250 to 450 mm, and the lateral dimension BW of the rear wall 64 is 200 to 200 mm. You may set suitably within the range of 400 mm.

  In the embodiment, the inclination angle θ that is inclined from the vertical plane VP of the attachment seat 42c (attachment wall portion 42) of the attachment portion 62c of the airbag 60 is 10 °, but the inclination angle θ is deployed and inflated. As a state in which the airbag 60 does not interfere with the seat 23, a range of 0 to 15 ° is desirable. If the inclination angle θ is too large, the driver D moving forward may slide on the rear wall portion 64 and may not be easily received by the rear wall portion 64. If the inclination angle θ does not reach 0 ° (the mounting seat 42c). This is because the airbag 60 that is inflated and inflated may interfere with the seat 23 (if the mounting wall portion 42 is inclined rearward and downward).

  Furthermore, in the embodiment, the case where the airbag 60 is mounted on the scooter 1 is shown. However, an airbag device is disposed in the vicinity of the center of the handle having a grip portion extending in the left and right directions in front of the seat. If the rear wall can catch the abdomen and chest under the driver's chin during the rearward expansion, it can be used for other three-wheel or four-wheel bikes without using the scooter 1. The airbag of this invention is applicable to the airbag apparatus mounted.

DESCRIPTION OF SYMBOLS 1 ... (Motorcycle) scooter, 2 ... Body side part, 11 ... Handle, 11b ... Support surface, 13L ... Left grip part, 13R ... Right grip part, 14 ... Center part, 23 ... Seat, 40 ... Airbag apparatus, 41 ... (storage part) case, 42c ... mounting seat,
60 ... Airbag, 62 ... Front wall portion, 62a ... Inflow opening, 62c ... Mounting portion, 62eu ... Upper edge, 62ed ... Lower edge, 64 ... Rear wall portion, 64a ... Restriction portion, 64eu ... Upper edge, 64ed ... Lower edge, 66 ... peripheral wall part, 67 ... upper wall part, 68 ... lower wall part, 69 ... left side wall part, 70 ... right side wall part, 72 ... tether, VP ... vertical plane, FT ... (vertical direction of front wall part Length dimension, BT ... length dimension (in the vertical direction of the rear wall), W0 ... width dimension (in the left-right direction of the airbag), W1 ... width dimension (between the grip parts), G ... inflation gas ,
D ... Driver, J ... Jaw, B ... Abdomen, C ... Chest.

Claims (3)

The seat is folded and stored in a storage portion disposed at a position below the handle on the front side of the motorcycle seat, and is attached to a mounting seat of a mounting wall portion disposed along a substantially vertical direction in the storage portion. A motorcycle airbag configured to be deployed and inflated rearward from the storage portion when the inflation gas flows in,
As the expansion completion shape,
A substantially rectangular front wall portion having an attachment portion attached to the attachment seat of the storage portion;
A substantially rectangular rear wall portion that can be configured as a restraining portion that receives the abdomen and chest under the driver's chin, is opposed to the front wall portion in a substantially front-rear direction, and is disposed substantially parallel to the front wall portion. When,
An upper wall, a lower wall, a left wall, and a substantially square cylindrical peripheral wall having a right wall, extending forward from the upper, lower, left and right edges of the outer peripheral edge of the rear wall;
With
The length of the rear wall from the lower edge on the lower wall portion side to the upper edge on the upper wall portion side is determined from the lower edge on the lower wall portion side of the front wall portion to the upper side on the upper wall portion side. It has a substantially square frustum shape that is longer than the length to the edge,
The front wall portion is configured such that the attachment portion is disposed at the periphery of the inflow opening for allowing the inflation gas to flow in, and disposed below the intermediate portion in the vertical direction of the front wall portion. A motorcycle airbag characterized by being made. The airbag at the completion of inflation is
While narrowing the width dimension in the left-right direction from the left and right grip parts of the handle,
At least when the driver of the rear wall portion receives the upper wall portion, the upper wall portion is set to a size that can be supported by contacting a portion of the handle between the left and right grip portions. Item 2. A motorcycle airbag according to Item 1.   3. The motorcycle airbag according to claim 1, wherein a tether that connects the left side wall part and the right side wall part when the inflation is completed is disposed.

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