CN117416449A - Airbag device for vehicle, airbag device for saddle-type vehicle, and airbag device for standing-type vehicle - Google Patents

Abstract

The invention provides an airbag device for a vehicle, an airbag device for a saddle-type vehicle, and an airbag device for a standing-riding type vehicle, wherein the airbag is in a state that can be separated from a locking state by a simple structure. An airbag device for a vehicle, which comprises an inflator (41) and an airbag (42), wherein the airbag (42) is cut off after inflation, a guide (60) for guiding gas is provided in the airbag (42), the airbag (42) is connected to the inflator (41) via the guide (60), the airbag (42) has an inlet (53) for gas, the guide (60) has an expansion (60 b) which is inserted into the inlet (53) and is disposed inside the airbag (42), the gas of the inflator (41) flows into the airbag (42) through the expansion (60 b), and the expansion (60 b) expands to a diameter larger than that of the inlet (53) when the gas is ejected at a predetermined gas ejection pressure or more, and can deform to a diameter smaller than that of the inlet (53) when the gas is ejected at a predetermined gas ejection pressure or less.

Description

Airbag device for vehicle, airbag device for saddle-type vehicle, and airbag device for standing-type vehicle

Technical Field

The present invention relates to an airbag device for a vehicle, an airbag device for a saddle-type vehicle, and an airbag device for a standing-ride type vehicle.

Background

Conventionally, there is known an airbag device for a saddle-type vehicle, which has an inflator attached to the saddle-type vehicle and an airbag connected to the inflator, and in which the airbag inflated by a gas discharged from the inflator is cut off after inflation (for example, refer to patent document 1). In the structure of patent document 1, the airbag is cut off from the inflator by a cut-off mechanism that operates by utilizing the pressure of the gas in the airbag.

Prior art literature

Patent document 1: international publication No. 2021/199334

Disclosure of Invention

Problems to be solved by the invention

However, in an airbag device provided in a vehicle such as a saddle-type vehicle, it is desirable that the airbag be in a state that can be separated from the locked state by a simple structure.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an airbag device for a vehicle in which an airbag can be released from a locked state with a simple structure.

Means for solving the problems

An airbag device for a vehicle, which has an inflator attached to the vehicle, and an airbag connected to the inflator, wherein the airbag inflated by a gas discharged from the inflator is cut off after inflation, and wherein a flexible guide portion for guiding the gas flowing from the inflator into the airbag is provided in the airbag, the airbag is connected to the inflator via the guide portion, the airbag has an inlet portion that is an inlet of the gas of the airbag, the guide portion has an inflation portion that is inserted into the inlet portion and is disposed inside the airbag, the gas of the inflator flows into the airbag through the inflation portion, the inflation portion is inflated to be larger than a diameter of an inlet portion of the airbag when the predetermined gas discharge pressure is higher, and the inflation portion is deformable to be smaller than the diameter of the inlet portion of the airbag when the predetermined gas discharge pressure is lower.

Effects of the invention

In an airbag device for a vehicle, an airbag can be brought into a state that can be separated from a locked state with a simple structure.

Drawings

Fig. 1 is a side view of a saddle-ride type vehicle according to an embodiment of the present invention.

Fig. 2 is a left side view showing a state where the airbag is deployed to protect an occupant.

Fig. 3 is a front view of the airbag before deployment, as seen from the front.

Fig. 4 is a diagram showing a state in which a guide portion is provided in an inlet portion.

Fig. 5 is a view showing a state in which a guide portion and an inflator are provided in an inlet portion.

Fig. 6 is a cross-sectional view taken along line VI-VI of fig. 5.

Fig. 7 is a cross-sectional view taken along line VII-VII of fig. 5.

FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 5 in a detached condition of the inflator.

Fig. 9 is a diagram showing an example of time variation in the internal pressure of the air bag and the guide portion.

Fig. 10 is a left side view of a standing car in a second embodiment of the present invention.

Fig. 11 is a front view of the airbag before deployment as seen from the front in the first reference example.

Fig. 12 is a front view of the airbag before deployment as seen from the front in the second reference example.

Fig. 13 is a front view of the airbag before deployment as seen from the front in the third reference example.

Fig. 14 is a front view of the airbag before deployment as seen from the front in the fourth reference example.

Fig. 15 is a view showing a connection state of the inlet portion, the inflator, and the tether in the fifth reference example.

Description of the reference numerals

10: a saddle-ride type vehicle;

17: a seat;

40: airbag devices (airbag devices for saddle-type vehicles, airbag devices for vehicles);

41: an inflator;

41a: an insertion section;

42: an air bag;

53: an inlet portion;

60: a guide section;

60b: an expansion section;

62: a sewing part;

210: a standing-riding type vehicle;

212: a platform part;

240: airbag devices (airbag devices for standing vehicles, airbag devices for vehicles).

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, the directions of the front, rear, left, right, up and down are the same as the directions with respect to the vehicle body unless otherwise specified. Note that, a reference numeral FR shown in each figure indicates a vehicle body front side, a reference numeral UP indicates a vehicle body upper side, and a reference numeral LH indicates a vehicle body left side.

Embodiment(s)

Fig. 1 is a side view of a saddle-type vehicle 10 according to an embodiment of the present invention.

The saddle-type vehicle 10 is a vehicle provided with: the vehicle body comprises a frame 11, a power unit 12 supported by the frame 11, a front fork 14 for supporting a front wheel 13 to be freely turnable, a swing arm 16 for supporting a rear wheel 15, and a seat 17 for a passenger.

The saddle-type vehicle 10 is a vehicle in which an occupant sits on a seat 17 in a straddling manner. Seat 17 is disposed above the rear of frame 11.

The frame 11 includes: a front vertical pipe 18 provided at a front end portion of the frame 11, a front frame 19 located rearward of the front vertical pipe 18, and a rear frame 20 located rearward of the front frame 19. The front end of the front frame 19 is connected to the front riser 18.

Seat 17 is supported by rear frame 20.

The front fork 14 is supported by the front standpipe 18 so as to be freely turnable in the left-right direction. The front wheel 13 is supported by an axle 13a provided at a lower end portion of the front fork 14. A steering handle 21 gripped by the occupant is attached to an upper end portion of the front fork 14.

The swing arm 16 is supported by a pivot 22 supported by the frame 11. The pivot 22 is an axis extending horizontally in the vehicle width direction. A pivot 22 is inserted through the front end of the swing arm 16. The swing arm 16 swings up and down about the pivot 22.

The rear wheel 15 is supported by an axle 15a provided at the rear end portion of the swing arm 16.

The power unit 12 is disposed between the front wheel 13 and the rear wheel 15, and is supported by the frame 11.

The power unit 12 is an internal combustion engine. The power unit 12 includes a crankcase 23 and a cylinder 24 that houses a reciprocating piston. The exhaust port of the cylinder portion 24 is connected to an exhaust device 25.

The output of the power unit 12 is transmitted to the rear wheels 15 through a driving force transmission member that connects the power unit 12 and the rear wheels 15.

The saddle-type vehicle 10 further includes: a front fender 26 covering the front wheel 13 from above, a rear fender 27 covering the rear wheel 15 from above, a pedal 28 for the foot of the occupant, and a fuel tank 29 storing fuel for the power unit 12.

The front fender 26 is mounted to the front fork 14. The rear fender 27 and the step 28 are disposed below the seat 17. The fuel tank 29 is supported by the frame 11.

The saddle-type vehicle 10 is a motorcycle. The fuel tank 29 is disposed forward of the seat 17 and rearward of the front riser 18.

The occupant R seated in the seat 17 holds the handle 21 by extending the arms R1 forward, puts the feet on the pedals 28, and holds the vehicle body by sandwiching the fuel tank 29, the frame 11, and the like by the legs R2.

The saddle type vehicle 10 includes an airbag device 40 that protects the occupant R.

The airbag device 40 is disposed in a position forward of the seat 17, and is disposed at a position overlapping the rear end portion of the fuel tank 29 in the vehicle width direction when the vehicle is viewed from the side.

The airbag device 40 is disposed in an airbag housing portion 29a provided at a rear end portion of the fuel tank 29. The airbag housing portion 29a is, for example, a recess formed by recessing the rear end portion of the fuel tank 29, and the airbag device 40 is disposed in the recess.

The airbag device 40 has an inflator 41 and an airbag 42 inflated by gas emitted from the inflator 41. The airbag 42 is stored in the airbag storage portion 29a in a folded state. The airbag 42 is disposed in a position forward of the seating position of the occupant R with respect to the seat 17, and is located in a position forward of the occupant. The airbag 42 is disposed at the center in the vehicle width direction, similarly to the front wheels 13.

The saddle type vehicle 10 includes an acceleration sensor (not shown) that detects an impact acting on the saddle type vehicle 10. The acceleration sensor is electrically connected to a control unit (not shown) of the saddle-type vehicle 10, and the control unit is electrically connected to the inflator 41. The control unit determines whether the airbag device 40 is operating or not based on the detected acceleration. When the airbag device 40 is operated, the control unit operates the inflator 41 to release gas into the airbag 42. The airbag 42 is inflated and deployed by the pressure of the gas. Here, the control unit may be an airbag control unit instead of the control unit of the vehicle itself. That is, the control unit may be an ECU (Electronic Control Unit: electronic control unit) for an airbag and may be an ECU independent of an ECU for vehicle control.

The airbag 42 is covered with a cover (not shown) that covers the airbag housing portion 29a from above. The airbag 42 is deployed by pushing the cover open when inflated.

Fig. 2 is a left side view showing a state where the airbag 42 is deployed to protect the occupant R. Fig. 3 is a front view of the airbag 42 before deployment, as seen from the front. In the present embodiment, the airbag 42 is basically deployed by the pressure expansion of the gas. Since the airbag 42 shown in fig. 3 is not inflated, fig. 3 is a diagram showing the airbag 42 before deployment.

The airbag 42 includes a first deployment section 51 that deploys upward from the airbag housing section 29a, and a pair of left and right second deployment sections 52 that branch from a lower portion of the first deployment section 51 and extend rearward.

The airbag 42 includes a pair of left and right inlet portions 53 at the lower end portion of the first deployment portion 51, and the inlet portions 53 are inlets for gas of the airbag 42.

The first deployment section 51 is disposed at the center in the vehicle width direction and covers the trunk R3 of the occupant R from the front.

Specifically, the first deployment section 51 integrally includes: a side upper deployment portion 51a extending upward from the airbag housing portion 29a on the left and right sides (right sides) with respect to the center in the vehicle width direction; and an upper deployment portion 51b on the other side (left side) of the vehicle width direction center, which extends upward from the airbag housing portion 29 a.

The one-side upper deployment section 51a and the other-side upper deployment section 51b are connected in the vehicle width direction (left-right direction) and extend upward substantially parallel to each other.

The first deployment section 51 includes a partition section 51c that partitions the space in the first deployment section 51 into a one-side upper deployment section 51a and another-side upper deployment section 51b. The partition portion 51c is provided from the lower end to the upper end of the first deployment portion 51.

The left and right one inlet 53 is provided at the lower end of the one-side upper deployment section 51 a. The left and right other inlet portions 53 are provided at the lower end portion of the upper deployment portion 51b on the other side.

The second deployment section 52 is a bar-like shape extending rearward of the vehicle from both lateral sides of the lower portion of the first deployment section 51 on the outside in the vehicle width direction. The base end portion of the second deployment section 52 communicates with the inside of the first deployment section 51.

The left and right second deployment sections 52 extend rearward from the side sections of the one-side upper deployment section 51 a.

The other left and right second development portions 52 extend rearward from the side portions of the other side upper development portion 51 b.

The second deployment section 52 extends obliquely rearward and upward from the first deployment section 51 in a side view of the vehicle. The second deployment section 52 extends from the first deployment section 51 to the rear of the occupant R along the outer side surface of the trunk R3, passing between the arm R1 of the occupant R seated in the seat 17 and holding the handle 21 and the leg R2 of the occupant R.

The one-side upper deployment section 51a and the one-side right and left second deployment section 52 constitute one-side deployment section 55R that deploys on the one side of the right and left.

The other side upper deployment section 51b and the other of the left and right second deployment sections 52 constitute an other side deployment section 55L that deploys on the other of the left and right sides.

The one side deployment section 55R and the other side deployment section 55L have mutually independent air cells into which the gas of the inflator 41 flows.

In a state where the airbag 42 is deployed, as shown in fig. 2, the airbag 42 surrounds the occupant R from the surroundings, and is attached to the occupant R.

Specifically, the first deployment section 51 contacts the trunk R3 from the front, and protects the trunk R3.

The second expansion portion 52 abuts the outer side surface of the trunk R3 below the arm R1, and protects the trunk R3. The rear end of the second expansion portion 52 may be in contact with the back of the trunk R3.

The occupant R is sandwiched between the first deployment section 51 and the left and right second deployment sections 52. This allows the airbag 42 to adhere well to the occupant R.

The left and right inlet 53 is cylindrical and extends from the lower end of the one-side upper deployment section 51a into the one-side upper deployment section 51 a.

The left and right other inlet portions 53 are cylindrical and extend from the lower end of the other side upper deployment portion 51b into the other side upper deployment portion 51 b.

The lower end of the inlet 53 opens to the outside of the airbag 42.

The airbag 42 is formed in a bag shape by sewing cloth. The inlet 53 of the present embodiment is made of cloth in the same manner as the airbag 42. The inlet 53 is a cloth formed in a cylindrical shape. In the present embodiment, the inlet 53 is described as being formed in a cylindrical shape, but the inlet 53 may be formed by simply overlapping two cloths and sewing the left and right ends of the overlapped cloths in a straight line.

A base member 56 for supporting the inlet 53 in the airbag 42 is provided in the airbag 42. The base member 56 is disposed to overlap with the inlet portion 53 in the front view of fig. 3. The base members 56 are provided in the one-side upper deployment section 51a and the other-side upper deployment section 51b, respectively. The base member 56 is made of cloth in the same manner as the airbag 42.

The base member 56 extends in the axial direction of the inlet portion 53. The base member 56 extends inward of the airbag 42 than the inlet portion 53. The inlet 53 is fixed to the base member 56 by being sewn to the base member 56.

The base member 56 is sewn and fixed to the airbag 42 by an inner sewn portion 56a located inside the airbag 42. That is, the inlet portion 53 is fixed to the inner side of the airbag 42 via the base member 56.

In the present embodiment, the structure in which the base member 56 and the inlet portion 53 are formed of different cloths is described, but the base member 56 and the inlet portion 53 may be a single cloth. That is, a part of the cloth constituting the base member 56 may constitute the inlet 53. Conversely, the base member 56 may be formed of a part of the cloth constituting the inlet 53.

The structure in which the base member 56 extends in the axial direction of the inlet portion 53 and is sewn to the airbag 42 by the inner sewn portion 56a located at the axial end portion is described, but the sewing position is not particularly limited. Accordingly, for example, the base member 56 may be stretched in the left-right direction of the inlet 53, and may be sewn and fixed to the airbag 42 at the end in the left-right direction.

Further, a portion of the cloth constituting the airbag 42 may constitute the base member 56 and the inlet portion 53.

Fig. 4 is a diagram showing a state in which the guide portion 60 is provided in the inlet portion 53. Fig. 5 is a view showing a state in which the guide portion 60 and the inflator 41 are provided in the inlet portion 53. Here, in fig. 4, the inflator 41 is not shown. In fig. 5, a bag-shaped main body of the airbag 42 is not shown.

The airbag device 40 includes a guide portion 60, and the guide portion 60 rectifies the gas flowing from the inflator 41 into the airbag 42 toward a target direction.

The guide portion 60 and the inlet portion 53 constitute a cut-off mechanism 61 that cuts off the inflated airbag 42 from the inflator 41.

The separating mechanism 61 is provided in the one-side development portion 55R and the other-side development portion 55L, respectively. The disconnecting mechanism 61 is configured similarly in the one-side development portion 55R and the other-side development portion 55L, and therefore, the disconnecting mechanism 61 of the one-side development portion 55R will be described in detail here.

The guide portion 60 is a cylindrical member extending in the axial direction of the inlet portion 53 as a whole.

The guide portion 60 integrally includes a tubular portion 60a inserted into the inlet portion 53, and an expansion portion 60b disposed inside the airbag 42 with respect to the tubular portion 60 a.

In the present embodiment, the guide portion 60 is made of cloth in the same manner as the airbag 42. The balloon 42, the guide portion 60, and the base member 56 are made of the same material, but may be made of different materials. For example, the guide portion 60 may be made of a silicone material instead of cloth, as long as it has flexibility. Thus, for example, the guide 60 may also be a silicone tube.

The guide portion 60 is made of cloth and has flexibility and can be easily folded. Therefore, the guide portion 60 in the folded state can be inserted into the inlet portion 53 from the outside, and the guide portion 60 can be fitted to the inlet portion 53.

The expansion portion 60b is disposed inside the airbag 42 with respect to the inlet portion 53, and is located in the vicinity of the inlet portion 53.

The expansion portion 60b is cylindrical extending in the axial direction of the inlet portion 53. The outer diameter of the expansion portion 60b is larger than the inner diameter of the inlet portion 53. The expansion portion 60b includes a projection 60c that projects outward in the vehicle width direction toward the second deployment portion 52 at a part of the tubular shape.

The guide portion 60 is a cylindrical member having both ends open in the axial direction. The opening at one end of the guide portion 60 is an inlet opening 60d at the end of the cylindrical portion 60 a. The opening at the other end of the guide portion 60 is an outlet opening 60e at the end of the expansion portion 60b.

The inlet opening 60d is located outside of the bladder 42. The outlet opening 60e is located inside the airbag 42.

The inflated portion 60b is temporarily fixed to the airbag 42 by a sewn portion 62 that sews the inflated portion 60b with the airbag 42. This allows the expansion portion 60b to be positioned with high accuracy with respect to the inlet portion 53.

The inflator 41 is fixed to the vehicle body of the saddle-type vehicle 10. The inflator 41 is fixed to a frame 11 as a vehicle body via a bracket (not shown), for example. In the present embodiment, the inflator 41 is fixed to the frame 11 via a bracket, but instead, a retainer (not shown) that accommodates the inflator 41 may be attached to the bracket of the frame 11, and the inflator 41 may be attached to the retainer.

The inflator 41 has an insertion portion 41a (fig. 5) inserted into the airbag 42.

The insertion portion 41a is cylindrical extending in the axial direction of the inlet portion 53. A gas discharge port 41b for discharging gas is provided at the distal end portion of the insertion portion 41 a.

The insertion portion 41a of the inflator 41 is inserted into the cylindrical portion 60a from the inlet opening 60d of the guide portion 60. A part of the insertion portion 41a is located inside the inlet portion 53 via the cylindrical portion 60 a. That is, a part of the insertion portion 41a is located inside the inner periphery of the inlet portion 53.

The distal end portion of the insertion portion 41a is disposed inside the expansion portion 60b and at a position overlapping in the axial direction. The gas discharge port 41b is disposed inside the expansion portion 60b and at a position overlapping in the axial direction. The gas discharge port 41b discharges gas inside the expansion portion 60 b.

The guide portion 60 is fixed to the outer periphery of the inflator 41 by an annular band member 63 fitted to the outer periphery of the cylindrical portion 60a on the outer side of the airbag 42. Therefore, the guide portion 60 and the inflator 41 are integrally connected. The inflator 41 is connected to the inlet portion 53 via the guide portion 60.

Fig. 6 is a cross-sectional view taken along line VI-VI of fig. 5. Fig. 7 is a cross-sectional view taken along line VII-VII of fig. 5. Fig. 8 is a cross-sectional view taken along line VIII-VIII of fig. 5. Here, in fig. 6 to 8, the airbag 42 is also illustrated. Fig. 8 shows a state in which the guide portion 60 and the inflator 41 are detached from the inlet portion 53. In fig. 6 to 8, an arrow indicated by reference numeral 65 indicates the direction of the external air pressure. In fig. 6 to 8, arrows indicated by reference numeral 66 indicate the direction of the internal pressure of the gas-based airbag 42. In fig. 6 to 8, a symbol 67 indicates the pressure of the gas in the back direction of the paper surface. In fig. 6, an arrow indicated by reference numeral 68 indicates the direction of the internal pressure of the gas-based expansion portion 60 b.

Fig. 9 is a diagram showing an example of time changes in the internal pressures P1 and P2 of the airbag 42 and the guide portion 60. The upper stage of fig. 9 shows a time change between the internal pressure P1 of the airbag 42 and the internal pressure P2 of the guide portion 60. In the upper stage of fig. 9, the vertical axis represents the pressure P, and the horizontal axis represents the time T. The lower stage of fig. 9 shows a time change in the pressure difference Δp (=p2—p1) between the internal pressure P1 of the airbag 42 and the internal pressure P2 of the guide portion 60. In the lower stage of fig. 9, the vertical axis represents the pressure difference Δp, and the horizontal axis represents the time T. In fig. 9, time t0 is the time of collision. The time t1 is the time at which the inflator 41 fires. Time t2 is the time when the inflation of the airbag 42 is completed.

In the state before the operation of the inflator 41, the external air pressure, the internal pressure P1 of the airbag 42, and the internal pressure P2 of the expansion portion 60b of the guide portion 60 are equal.

When an acceleration associated with a collision or the like is detected (time t0 in fig. 9), the control unit determines whether or not to operate the airbag device 40. When the control unit determines to operate the airbag device 40, it ignites the inflator 41 to operate (time t1 in fig. 9). Therefore, the period from time t0 to time t1 is a collision determination period A1 in which the control unit determines whether or not to operate the airbag device 40, in other words, whether or not a collision has occurred.

When the inflator 41 is operated (time t1 in fig. 9), the gas from the inflator 41 is discharged from the gas discharge port 41b into the expansion portion 60b of the guide portion 60, and then flows into the airbag 42 from the outlet opening 60 e. Thereby, the expansion portion 60b and the airbag 42 are inflated by the gas. At this time, with respect to the sewn portion 62, the sewn portion 62 is broken or loosened by the inflation of the inflation portion 60b, and the temporary fixation of the sewn portion 62 is released, and the airbag 42 is inflated to be larger than the inflation portion 60b, so that the inflation portion 60b is separated from the airbag 42.

At this time, the guide portion 60 rectifies the gas to efficiently expand the airbag 42, and protects the airbag 42 from the heat of the gas in the vicinity of the inlet portion 53. That is, the guide portion 60 functions as a heat-resistant shield that prevents heat of the gas from contacting the airbag main body of the airbag 42, in addition to the function of rectifying the gas. That is, the guide portion 60 also has a function of preventing the high-temperature gas in the vicinity of the gas discharge port 41b of the inflator 41 from coming into contact with the airbag main body of the airbag 42.

In a state where the inflator 41 is operated and the gas is being discharged from the gas discharge port 41b (fig. 5), that is, in a gas discharge period A2 which is a period from time t1 to time t2, as shown in fig. 9, the internal pressure P2 of the expansion portion 60b is larger than the internal pressure P1 of the airbag 42, and the internal pressure P1 of the airbag 42 is larger than the external air pressure. Since the gas discharge port 41b discharges gas in the expansion portion 60b, the internal pressure P2 of the expansion portion 60b is larger than the internal pressure P1 of the airbag 42.

In a state in which the gas is being discharged from the gas discharge port 41b and the airbag 42 is in a state before it is fully inflated, as shown in fig. 7, the inlet 53 receives the internal pressure of the airbag 42 indicated by reference numeral 66, and therefore, the inlet 53 is pressed against the insertion portion 41a of the inflator 41, and the cylindrical shape is maintained by the insertion portion 41 a. In a state where the gas is being discharged from the gas discharge port 41b and before the airbag 42 is fully inflated, the inflated portion 60b is inflated by the pressure of the gas, and has a cylindrical shape with a larger diameter than the inlet portion 53, as shown in fig. 6.

That is, when the internal pressure P2 of the gas-based expansion portion 60b is higher than the internal pressure P1 of the gas-based airbag 42 by a predetermined value or more, that is, when the pressure difference Δp is larger than the predetermined value Δp2 (a state of a predetermined gas discharge pressure or more), the outer diameter D1 (fig. 6) of the expansion portion 60b is larger than the inner diameter D2 (fig. 7) of the inlet portion 53, and this state is maintained for a predetermined period of time by the internal pressure P2 of the expansion portion 60 b. In other words, when the pressure difference Δp is larger than the predetermined value Δp2, the expansion portion 60b of the guide portion 60 is less likely to be deformed to a small diameter. In a state in which the expansion portion 60b is expanded, the expansion portion 60b is caught by the inlet portion 53, and the expansion portion 60b cannot pass through the inlet portion 53 in the axial direction. In this state, the airbag 42 is locked by the expansion portion 60b and does not fall off from the guide portion 60 and the inflator 41.

At this time, the inlet portion 53 receives the internal pressure of the airbag 42 indicated by reference numeral 66, and is pressed against the insertion portion 41a of the inflator 41, and the inlet portion 53 can be said to be in a state of sandwiching the insertion portion 41a from the surroundings. Therefore, the inlet 53 is pressed against the inflator 41 by the internal pressure of the airbag 42 in the gas discharge state, and thus, the airbag 42 can be prevented from being detached from the inflator 41. Therefore, for example, the difficulty of the detachment can be adjusted by adjusting the amount of overlap of the inlet portion 53 and the insertion portion 41a, that is, the contact area, or using a member having a different friction coefficient.

In fig. 6, the expansion portion 60b is schematically shown in a state of being expanded into a perfect circle, but the expansion portion 60b may not be in a perfect circle.

When the discharge of the gas from the gas discharge port 41b is completed, the airbag 42 is in a fully inflated state (time t2 in fig. 9). In this state, the internal pressure P1 of the airbag 42 is larger than the external pressure of the airbag 42, but the pressure difference Δp between the internal pressure P2 of the inflated portion 60b and the internal pressure P1 of the airbag 42 becomes smaller, and the two become equal in some cases. The state where the internal pressure P2 of the expansion portion 60b is equal to the internal pressure P1 of the airbag 42 is a state where the pressure difference Δp between the internal pressure P2 of the expansion portion 60b and the internal pressure P1 of the airbag 42 is smaller than the predetermined value Δp2 (a state where the pressure is smaller than the predetermined gas discharge pressure).

When the internal pressure P2 of the expansion portion 60b is equal to the internal pressure P1 of the airbag 42, the expansion portion 60b is contracted as compared with when the internal pressure P2 of the expansion portion 60b is higher than the internal pressure P1 of the airbag 42. In other words, when the pressure difference Δp is equal to or smaller than the predetermined value Δp1 which is smaller than the predetermined value Δp2, the expansion portion 60b of the guide portion 60 is easily deformed to a small diameter. This releases the engagement of the airbag 42 by the expansion portion 60b, and the expansion portion 60b can pass through the inlet 53 in the axial direction. The period after time t2 when the inflation of the airbag 42 is completed is a separable period A3 in which the airbag 42 can be separated from the guide portion 60 and the inflator 41.

Referring to fig. 6, the inner pressure of the air bag 42 presses the end surface 41c of the insertion portion 41a in the axial direction as indicated by reference numeral 67 in the inflated portion 60 b. The pressure of 67 acts as a force pushing the inflator 41 out of the airbag 42. That is, the pressure of 67 becomes a force that separates the inflator 41 and the airbag 42 in the axial direction of the insertion portion 41a during the separable period A3, and the airbag 42 is separated from the guide portion 60 and the inflator 41 by this force.

The inflated portion 60b and the inserted portion 41a in the deflated state receive a force that passes through the inlet portion 53 and comes out of the airbag 42 due to the pressure of the reference numeral 67.

Here, the detachment of the airbag 42 from the guide portion 60 and the inflator 41 means that the guide portion 60 and the inflator 41 are directed to exit from the inlet portion 53 to the outside of the airbag 42, and the airbag 42 is detached from the guide portion 60 and the inflator 41.

Before the state in which the locking of the airbag 42 by the inflation portion 60b is released and the airbag 42 is separated from the guide portion 60 and the inflator 41 is reached, the airbag 42 may be separated from the guide portion 60 and the inflator 41 by applying an inertial force of the airbag main body of the airbag 42 based on the deployment behavior of the airbag 42, a force by which the airbag 42 attached to the occupant R moves integrally with the occupant R and is pulled, or the like, in addition to the pressure of the reference numeral 67 pressing the end surface 41c in the axial direction of the insertion portion 41 a.

Referring to fig. 7 and 8, when the insertion portion 41a is detached from the inlet portion 53, the member that maintains the shape of the inlet portion 53 disappears, and therefore, the inlet portion 53 collapses due to the internal pressure of the airbag 42 shown by reference numeral 66, and the inlet portion 53 closes. This suppresses the gas in the airbag 42 from flowing outward from the inlet 53. That is, the inlet 53 functions as a check valve that operates by the internal pressure of the airbag 42 to prevent the outflow of gas. In fig. 7, the closed inlet portion 53 is illustrated by an imaginary line.

The base member 56 supporting the inlet portion 53 is fixed inside the airbag 42 by an inner sewn portion 56 a. This can prevent the inlet 53 from being discharged to the outside of the airbag 42 due to the internal pressure of the airbag 42. Therefore, the inlet portion 53 can be made to function well as a check valve.

When the airbag 42 is deployed, the airbag 42 is attached to the occupant R and is cut away from the inflator 41. Therefore, after the airbag 42 is deployed, the airbag 42 is restrained from being excessively pulled by the inflator 41 to deflect the airbag 42 from the occupant R.

The inlet 53 functions as a check valve for gas, and therefore, the airbag 42 remains inflated even after being detached from the guide 60 and the inflator 41, and adheres well to the occupant R.

As described above, according to the embodiment to which the present invention is applied, the airbag device 40 of the saddle type vehicle, which is an example of the airbag device of the vehicle, includes the inflator 41 attached to the saddle type vehicle 10 and the airbag 42 connected to the inflator 41, and the airbag 42 inflated by the gas discharged from the inflator 41 is cut off after inflation, wherein the flexible guide portion 60 that guides the gas flowing from the inflator 41 into the airbag 42 is provided in the airbag 42, the airbag 42 is connected to the inflator 41 via the guide portion 60, the airbag 42 has the inlet portion 53 that is the inlet of the gas of the airbag 42, the guide portion 60 has the inflation portion 60b that is inserted into the inlet portion 53 and is arranged inside the airbag 42, the gas of the inflator 41 flows into the airbag 42 through the inflation portion 60b, and the inflation portion 60b is inflated to be larger than the diameter of the inlet portion 53 of the airbag 42 when the gas is discharged at a predetermined gas discharge pressure or higher, and is deformed to be smaller than the diameter of the inlet portion 53 of the airbag 42 when the gas is discharged at a predetermined gas discharge pressure or lower.

According to this configuration, when the airbag 42 is inflated, the inflation portion 60b of the guide portion 60 is inflated to be larger than the diameter of the inlet portion 53 of the airbag 42 and is engaged with the inlet portion 53 when the predetermined gas discharge pressure is higher than or equal to the predetermined gas discharge pressure, and therefore, the airbag 42 can be engaged by the inflation portion 60b of the guide portion 60. When the gas discharge pressure is smaller than the predetermined gas discharge pressure, the expansion portion 60b of the guide portion 60 is contracted as compared with the case where the gas discharge pressure is equal to or higher than the predetermined gas discharge pressure, and thus the locking of the airbag 42 by the expansion portion 60b of the guide portion 60 is released, and the airbag 42 can be cut off from the guide portion 60. Therefore, the airbag 42 can be brought into a state that can be cut off from the locked state with a simple structure by the guide portion 60 that rectifies the gas.

In the present embodiment, the inflated portion 60b is temporarily fixed to the airbag 42 by the sewn portion 62 sewn to the airbag 42, and the temporary fixation of the sewn portion 62 is released by inflation of the airbag 42 by the gas.

According to this configuration, since the expansion portion 60b of the guide portion 60 is temporarily fixed to the airbag 42 by the sewn portion 62, the expansion portion 60b of the guide portion 60 can be positioned in a state in which the airbag 42 is not deployed, and the expansion position of the expansion portion 60b can be adjusted. In addition, according to this structure, when the expansion portion 60b expands, the temporary fixation of the sewn portion 62 is released, and therefore the airbag 42 can be cut away from the guide portion 60.

In the present embodiment, the inlet 53 extends into the airbag 42, and when the airbag 42 is cut off from the guide 60, the inlet 53 closes the inlet 53 by the internal pressure of the airbag 42.

According to this structure, the inlet portion 53 extending in the airbag 42 can form a check valve for gas with a simple structure. The check valve can suppress the outflow of gas from the airbag 42, and therefore, the cut airbag 42 can be maintained in an inflated state.

In the present embodiment, the inflator 41 has an insertion portion 41a that is inserted into the airbag 42, and the gas is ejected from the insertion portion 41a, and the insertion portion 41a is positioned inside the inlet portion 53.

According to this structure, when the airbag 42 is inflated, the insertion portion 41a located inside the inlet portion 53 can maintain the inlet portion 53 in the opened state in a state before the airbag 42 is cut off from the guide portion 60. In addition, since the insertion portion 41a inside the inlet portion 53 disappears in a state in which the airbag 42 is separated from the guide portion 60, the inlet portion 53 collapses by the internal pressure of the airbag 42, and the inlet portion 53 can be closed.

In addition, according to the embodiment to which the present invention is applied, in the airbag device 40 of the saddle type vehicle in which the airbag 42 inflated by the gas discharged from the inflator 41 is cut off after inflation, the airbag device 40 of the saddle type vehicle has the inflator 41 attached to the inflator 41 and the airbag 42 connected to the inflator 41, the airbag 42 has the inlet portion 53 as the inlet of the gas of the airbag 42, the inlet portion 53 extends inside the airbag 42, the inlet portion 53 is at least partially overlapped with the inflator 41, and the inlet portion 53 is pressed against the inflator 41 by the internal pressure of the airbag 42 in the gas discharge state, and the cut off of the airbag 42 from the inflator 41 can be suppressed.

According to this configuration, the inlet portion 53 is pressed against the inflator 41 by the internal pressure of the airbag 42 in the gas discharge state, and therefore, the airbag 42 can be prevented from being cut off from the inflator 41.

Second embodiment

A second embodiment to which the present invention is applied will be described below with reference to fig. 10. In the second embodiment, the same reference numerals are given to the same components as those of the above embodiment (first embodiment), and the description thereof is omitted.

The second embodiment differs from the above embodiment in that the airbag device 240 is mounted on the passenger vehicle 210. The basic structure of the airbag device 240 of the second embodiment is the same as that of the airbag device 40 of the first embodiment.

Fig. 10 is a left side view of a standing car 210 in a second embodiment of the present invention.

The standing-ride type vehicle 210 is a vehicle provided with: a frame 211; a plate-like platform 212 on which the occupant R rides; a steering unit 213 supported by the front end of the frame 211 so as to be freely steered left and right; a front wheel 214 supported by the lower end of the steering unit 213; and a rear wheel 215 provided at a rear end portion of the vehicle body. The platform 212 is supported by the frame 211.

The steering unit 213 includes a steering shaft 216 supported by the front end portion of the frame 211, and a handle 217 provided at the upper end portion of the steering shaft 216.

The occupant R stands on the platform 212 at a position rearward of the handle 217, and rides on the standing vehicle 210 by holding the handle 217 by hand.

The standing vehicle 210 is a so-called scooter type vehicle on which the occupant R sits in a standing posture.

The riding position 218 of the occupant R is located behind the handle 217 and in front of the rear wheel 215 on the platform 212.

A box-shaped holder (airbag housing portion) 220 is provided on the rear surface portion of the handle 217. The airbag device 240 of the present embodiment is housed in the holder 220. The retainer 220 and the airbag device 240 are disposed forward and upward relative to the riding position 218.

As shown in phantom in fig. 10, the retainer 220 may be provided on the rear surface of the steering shaft 216 below the handle 217, and the airbag device 240 may be housed in the retainer 220.

When the airbag 42 is deployed, the airbag 42 deploys rearward and upward from the retainer 220, surrounds the occupant R from the surroundings, and adheres to the occupant R. At this time, in the present embodiment, the airbag 42 may be brought into the locked state before the sufficient inflation by the disconnecting mechanism 61, and the airbag 42 may be brought into a state of being able to be disconnected from the inflator 41 after the sufficient inflation.

As described above, according to the second embodiment to which the present invention is applied, in the airbag device 240 provided in the standing type vehicle 210 provided with the platform portion 212 on which the occupant R stands, the same operational effects as those of the airbag device 40 of the saddle type vehicle of the first embodiment are obtained. That is, according to the airbag device 240 of the standing and riding vehicle of the second embodiment, when the airbag 42 is inflated, the inflation portion 60b of the guide portion 60 is inflated to be larger than the diameter of the inlet portion 53 of the airbag 42 and is engaged with the inlet portion 53 when the predetermined gas discharge pressure is exceeded, and therefore, the airbag 42 can be engaged by the inflation portion 60b of the guide portion 60. When the gas discharge pressure is smaller than the predetermined gas discharge pressure, the expansion portion 60b of the guide portion 60 is contracted as compared with the case where the gas discharge pressure is equal to or higher than the predetermined gas discharge pressure, and thus the locking of the airbag 42 by the expansion portion 60b of the guide portion 60 is released, and the airbag 42 can be cut off from the guide portion 60. Therefore, the airbag 42 can be brought into a state that can be cut off from the locked state with a simple structure by the guide portion 60 that rectifies the gas.

Other embodiments

The above embodiment shows an embodiment to which the present invention is applied, and the present invention is not limited to the above embodiment.

In the above embodiment, the case where the locking of the airbag 42 by the guide portion 60 is released when the internal pressure of the guide portion 60 is equal to the internal pressure of the airbag 42 has been described, but the present invention is not limited to this. For example, the release of the locking of the airbag 42 by the shrinkage of the guide portion 60 may be performed in a state where the internal pressure is smaller than the predetermined value and the internal pressure of the guide portion 60 is higher than the internal pressure of the airbag 42.

In the above embodiment, the airbag device 40, 240 is disposed in front of the occupant R, but the present invention is not limited to this. For example, the airbag devices 40 and 240 may be disposed behind the occupant R, and the airbag 42 may be attached to the occupant R from behind.

In the above embodiment, the inflator 41 is exemplified, and the structure in which the insertion portion 41a inserted into the airbag 42 corresponds to the main body portion having the largest diameter of the inflator 41 is described. However, the insertion portion may not be the main body portion of the inflator 41. For example, in the case where a tube connected to the gas discharge port 41b of the inflator 41 is provided and gas is discharged from the tip end of the tube, the tip end of the tube corresponds to an insertion portion to be inserted into the airbag 42.

In the above-described embodiment, the saddle-type vehicle 10 has been described as an example of a motorcycle, but the saddle-type vehicle is not limited to this, and may be a three-wheeled saddle-type vehicle having two front wheels or rear wheels, or a saddle-type vehicle having four or more wheels.

[ Structure supported by the above embodiment ]

The above embodiment supports the following structure.

An airbag device for a vehicle having an inflator attached to a vehicle and an airbag connected to the inflator, wherein the airbag inflated by a gas discharged from the inflator is cut off after inflation, and wherein a flexible guide portion for guiding the gas flowing from the inflator into the airbag is provided in the airbag, the airbag is connected to the inflator via the guide portion, the airbag has an inlet portion that is an inlet of the gas of the airbag, the guide portion has an inflation portion that is inserted into the inlet portion and is disposed inside the airbag, the gas of the inflator flows into the airbag through the inflation portion, and the inflation portion is inflated to be larger than a diameter of an inlet portion of the airbag when the gas discharge pressure is equal to or higher than a predetermined gas discharge pressure, and is deformable to be smaller than the diameter of the inlet portion of the airbag when the gas discharge pressure is lower than the predetermined gas discharge pressure.

According to this configuration, when the airbag is inflated, the inflation portion of the guide portion is inflated to be larger than the diameter of the inlet portion of the airbag and is engaged with the inlet portion when the predetermined gas discharge pressure is higher than the predetermined gas discharge pressure, and therefore, the airbag can be engaged by the inflation portion of the guide portion. When the pressure is smaller than the predetermined gas discharge pressure, the expansion portion of the guide portion is contracted as compared with the pressure equal to or higher than the predetermined gas discharge pressure, and thus the locking of the airbag by the expansion portion of the guide portion is released, and the airbag can be cut off from the guide portion. Therefore, the airbag can be brought into a state that can be cut off from the locked state with a simple structure by the guide portion that rectifies the gas.

(structure 2) in the airbag apparatus of the vehicle of structure 1, the inflated portion is temporarily fixed to the airbag by being sewn to a sewn portion of the airbag, and the temporary fixation of the sewn portion is released by inflation of the airbag by means of gas.

According to this configuration, since the expansion portion of the guide portion is temporarily fixed to the airbag by the sewn portion, the expansion portion of the guide portion can be positioned in a state in which the airbag is not deployed, and the expansion position of the expansion portion can be adjusted. In addition, according to this structure, when the inflation portion is inflated, the temporary fixation of the sewn portion is released, and therefore the airbag can be cut away from the guide portion.

(structure 3) in the airbag device of the vehicle of structure 1 or 2, the inlet portion extends into the airbag, and when the airbag is cut off from the guide portion, the inlet portion closes the inlet portion by the internal pressure of the airbag.

According to this structure, the gas check valve can be formed with a simple structure by the tubular inlet portion extending in the airbag. The check valve can suppress the outflow of gas from the airbag, and therefore, the cut airbag can be maintained in an inflated state.

(structure 4) in the airbag apparatus of the vehicle of structure 3, the inflator has an insertion portion that is inserted into the airbag, and the gas is ejected from the insertion portion, and the insertion portion is located inside the inlet portion.

According to this configuration, the insertion portion positioned inside the inlet portion can maintain the inlet portion in an opened state in a state before the airbag is detached from the guide portion at the time of inflation of the airbag. In addition, since the insertion portion inside the inlet portion disappears in a state in which the airbag is detached from the guide portion, the inlet portion collapses due to the internal pressure of the airbag, and the inlet portion can be closed.

An aspect of the present invention provides an airbag device for a vehicle, including an inflator mounted to the vehicle and an airbag connected to the inflator, wherein the airbag inflated by a gas discharged from the inflator is cut off after inflation, the airbag device for a vehicle having an inlet portion as an inlet of the gas of the airbag, the inlet portion extending in the airbag, the inlet portion and the inflator being at least partially overlapped, the inlet portion being pressed against the inflator by an internal pressure of the airbag in a gas discharge state, and the airbag being able to be prevented from being cut off from the inflator.

According to this configuration, the inlet portion is pressed against the inflator by the internal pressure of the airbag in the gas discharge state, and therefore, the airbag can be prevented from being detached from the inflator.

(configuration 6) an airbag device for a saddle-ride type vehicle provided in a saddle-ride type vehicle having a seat for an occupant, characterized in that the airbag device for a saddle-ride type vehicle is constituted by the airbag device for a vehicle according to any one of configurations 1 to 5.

According to this configuration, in the airbag device of the saddle-type vehicle, the expansion portion of the guide portion expands to be larger than the diameter of the inlet portion of the airbag and is engaged with the inlet portion when the predetermined gas discharge pressure or higher is applied to the airbag, and therefore, the airbag can be engaged by the expansion portion of the guide portion. When the pressure is smaller than the predetermined gas discharge pressure, the expansion portion of the guide portion is contracted, and the locking of the airbag by the expansion portion of the guide portion is released, so that the airbag can be separated from the guide portion. Therefore, the airbag can be brought into a state that can be cut off from the locked state with a simple structure by the guide portion that rectifies the gas.

(configuration 7) an airbag device for a standing vehicle provided in a standing vehicle having a platform on which an occupant stands, the airbag device for a standing vehicle being configured by the airbag device for a vehicle according to any one of configurations 1 to 5.

According to this configuration, in the airbag device for a passenger vehicle, the expansion portion of the guide portion expands to be larger than the diameter of the inlet portion of the airbag and is engaged with the inlet portion when the predetermined gas discharge pressure is higher than the predetermined gas discharge pressure during the expansion of the airbag, and therefore, the airbag can be engaged by the expansion portion of the guide portion. When the pressure is smaller than the predetermined gas discharge pressure, the expansion portion of the guide portion is contracted as compared with the pressure equal to or higher than the predetermined gas discharge pressure, and thus the locking of the airbag by the expansion portion of the guide portion is released, and the airbag can be cut off from the guide portion. Therefore, the airbag can be brought into a state that can be cut off from the locked state with a simple structure by the guide portion that rectifies the gas.

Reference example

Hereinafter, an airbag cutting mechanism for cutting the inflated airbag 242 from the inflator 241 will be described with reference to fig. 11 to 15. In this reference example, the same reference numerals are given to the same components as those of the above embodiment, and the description thereof is omitted.

The airbag 242 is the same as the airbag 42, and the inflator 241 is the same as the inflator 41, but for the sake of distinction from the above embodiment, the description will be given with reference numerals 242 and 241.

Fig. 11 is a front view of the airbag 242 before deployment as seen from the front in the first reference example.

The airbag 242 includes one deployment section 55R and the other deployment section 55L. The one-side expansion portion 55R and the other-side expansion portion 55L each include an inlet 53.

The inflators 241 are inserted into the pair of left and right inlet portions 53, respectively. The one-side deployment section 55R and the other-side deployment section 55L are inflated by the gas released from the inflator 241.

The left and right one inlet 53 is provided at a lower end 55a of the one-side deployment section 55R. The left and right other inlet portions 53 are provided at the lower end portion 55b of the other side development portion 55L. The lower end portions 55a and 55b are lower end portions of the air cells 242.

The airbag cutoff mechanism 261 includes a tether 280 connected to the airbag 242 and a tether cutter 281 for cutting off the tether 280.

The tie cutter 281 is fixed to the vehicle body of the saddle-type vehicle 10. The lace cutters 281 are fixed to the frame 11 via brackets, for example. The lace cutter 281 is electrically connected to the control unit.

The tether 280 is a tether connecting the airbag 242 and the tether cutter 281. The middle part of the lace 280 in the longitudinal direction is a connection part 280a connected to a lace cutter 281.

The strap 280 includes: a one-side tether portion 282 extending from the connection portion 280a toward the airbag 242 and connected to the lower end portion 55a of the one-side deployment portion 55R; and the other tether portion 283 extending from the connection portion 280a toward the airbag 242 and connected to the lower end portion 55b of the other deployment portion 55L.

One end of one side lacing portion 282 is a connecting portion 280a. The other end 282a of the one-side lace 282 is connected to the lower end 55 a. Specifically, the other end 282a is connected to the vehicle width direction outside of the inlet 53 of the one-side expansion portion 55R at the lower end portion 55 a.

One end of the other lace 283 is the connecting portion 280a. The other end 283a of the other tether portion 283 is connected to the lower end 55 b. Specifically, the other end 283a is connected to the vehicle width direction outer side of the inlet 53 of the other side expansion portion 55L at the lower end portion 55 b.

The other ends 282a and 283a are connected to the lower end portion of the airbag 242, but the positions at which the other ends 282a and 283a are connected are not limited to the lower end portion. The other ends 282a and 283a may be connected to the vicinity of the inlet 53, and may be connected to any end of the airbag 242.

The airbag 242 is pulled toward the tether cutter 281 via the tether 280, and is thereby fixed to the vehicle body. By fixing the airbag 242 via the tether 280 and the tether cutter 281, the inflator 241 maintains the state of being inserted into the inlet portion 53.

In fig. 11, the tether cutter 281 is disposed on the opposite side of the airbag 242 with respect to the inflator 241 in the axial direction of the inlet portion 53.

When the control unit determines to inflate the airbag 242, the control unit operates the inflator 241 to inflate the airbag 242 with gas. In this state, the airbag 242 is fixed to the vehicle body via the tether 280 and the tether cutter 281. The tether 280 receives a force to detach the airbag 242 from the inflator 241 by the pressure of the gas, preventing the airbag 242 from being detached from the inflator 241.

The control unit operates the strap cutter 281 to cut the strap 280 after a predetermined time from the operation of the inflator 241. The connection portion 280a of the tie 280 is cut off. The predetermined time is, for example, a time taken from when the inflator 241 is operated to when the airbag 242 is fully inflated. The inflated airbag 242 is attached to the occupant R.

When the tether 280 is cut, the restraint of the airbag 242 by the tether 280 is released. Accordingly, the airbag 242 moves in the axial direction of the inflator 241 so as to be separated from the inflator 241 by the internal pressure of the airbag 242, and the airbag 242 is separated from the inflator 241. When the airbag 242 is cut off, the inlet portion 53 as a check valve is closed by the internal pressure of the airbag 242.

In the airbag cut-off mechanism 261, the airbag 242 can be fixed to the vehicle body with a simple structure by the tether 280. In addition, by cutting the tether 280 with the tether cutter 281, the airbag 242 can be cut off from the inflator 241 with a simple configuration. By adjusting the timing of operating the tether cutter 281, the airbag 242 can be cut off at an arbitrary timing.

The other ends 282a and 283a of the tether 280 are connected to the airbag 242 at positions on the other end 241b side of the inflator 241 with respect to one end 241a of the inflator 241 located inside the airbag 242 in the axial direction of the inflator 241. This can suppress the tether 280 from interfering with the inflation of the airbag 242, and can satisfactorily inflate the airbag 242.

The tether 280 is connected to the airbag 242 at two positions separated from each other by a pair of left and right one-side tether portions 282 and the other-side tether portion 283. Accordingly, when the airbag 242 is inflated, the airbag 242 can be supported well by the pair of left and right one-side tether portions 282 and the other-side tether portion 283, and the airbag 242 can be inflated well.

Fig. 12 is a front view of the airbag 242 before deployment as seen from the front in the second reference example.

In the second reference example, the other end 282a of the one-side tether portion 282 is connected to the vehicle width direction inner side of the inlet portion 53 of the one-side deployment portion 55R at the lower end portion 55 a.

In the second reference example, the other end 283a of the other tether portion 283 is connected to the vehicle width direction inner side of the inlet portion 53 of the other deployment portion 55L at the lower end portion 55 b.

Fig. 13 is a front view of the airbag 242 before deployment as seen from the front in the third reference example.

In the third reference example, the other end 282a of the one-side tether portion 282 is connected to the vehicle width direction inner side of the inlet portion 53 of the one-side deployment portion 55R at the lower end portion 55 a.

In the third reference example, the other end 283a of the other tether portion 283 is connected to the vehicle width direction outside of the inlet portion 53 of the other deployment portion 55L at the lower end portion 55 b.

Fig. 14 is a front view of the airbag 242 before deployment as seen from the front in the fourth reference example.

The airbag cutting mechanism 461 includes a tether cutter 281, and a first tether 481 and a second tether 482 connected to the airbag 242.

The first tether 481 and the second tether 482 are cords connecting the airbag 242 and the tether cutter 281.

The middle portion in the longitudinal direction of the first lace 481 is a connecting portion 481a that is connected to a lace cutter 281.

The first tether 481 includes a first outer tether portion 483 and a first inner tether portion 484 that extend from the connection portion 481a toward the airbag 242 and are connected to the lower end portion 55a of the one-side deployment portion 55R.

One end of the first outer tie portion 483 is a connecting portion 481a. The other end 483a of the first outer tether portion 483 is connected to the vehicle width direction outer side of the inlet portion 53 of the one-side deployment portion 55R at the lower end portion 55 a.

One end of the first inner tether portion 484 is a connecting portion 481a. The other end 484a of the first inner tether portion 484 is connected to the vehicle width direction inner side of the inlet portion 53 of the one-side deployment portion 55R at the lower end portion 55 a.

The middle portion of the second lace 482 in the longitudinal direction is a connecting portion 482a connected to a lace cutter 281.

The second tether 482 includes a second outer tether portion 485 and a second inner tether portion 486 which extend from the connection portion 482a to the airbag 242 and are connected to the lower end portion 55b of the other deployment portion 55L.

One end of the second outer tie portion 485 is a connecting portion 482a. The other end 485a of the second outer tether portion 485 is connected to the vehicle width direction outside of the inlet portion 53 of the other side deployment portion 55L at the lower end portion 55 b.

At one end of the second inner lace portion 486 is a connecting portion 482a. The other end 486a of the second inner tether portion 486 is connected to the vehicle width direction inner side of the inlet portion 53 of the other side deployment portion 55L at the lower end portion 55 b.

The lace cutter 281 cuts off the connection portion 481a and the connection portion 482a.

Fig. 15 is a diagram showing a connection state of the inlet portion 53, the inflator 241, and the tether 580 in the fifth reference example.

A cylindrical projection 242a projecting downward is provided at the lower end of the airbag 242.

The inlet 53 is provided in the projection 242a.

The protruding portion 242a is provided with a hole 590 penetrating the airbag 242 at a position offset in the vehicle width direction from the inlet portion 53. The hole 590 is disposed outside the portion of the inflator 241 into which the gas flows.

The inflator 241 has an inlet insertion portion 241c inserted into the inlet portion 53. A groove portion 241d recessed radially inward is provided on the outer periphery of the inlet insertion portion 241c. The groove 241d is annular around the outer periphery of the inlet insertion portion 241c.

The airbag detachment mechanism 561 includes a tether cutter 281 (fig. 11) and a tether 580 connected to the airbag 242.

One end of the lace 580 is coupled to a lace cutter 281.

The other end of the tether 580 is mounted to the protrusion 242a. Specifically, the other end portion of the tether 580 includes a winding portion 581 wound around the outer periphery of the protrusion 242a.

The winding portion 581 passes through the hole portion 590 and is wound around the outer periphery of the protrusion portion 242a. The front end of the winding part 581 is the other end 580a of the tether 580. The other end 580a is connected to the projection 242a. The other end 580a is provided in the protruding portion 242a on the opposite side of the hole 590 with the inflator 241 interposed therebetween.

The winding portion 581 is wound around the groove portion 241d located inside the protrusion portion 242a via the protrusion portion 242a. This can firmly fix the protruding portion 242a and the strap 580 to the groove 241d.

When the lace 580 is cut by the lace cutter 281, the winding portion 581 is loosened. Accordingly, the airbag 242 can be cut off from the inflator 241.

Claims (7)

1. An airbag device for a vehicle having an inflator (41) mounted to the vehicle and an airbag (42) connected to the inflator (41), the airbag (42) inflated by gas discharged from the inflator (41) being cut off after inflation, characterized in that,

a flexible guide portion (60) for guiding the gas flowing from the inflator (41) into the airbag (42) is provided in the airbag (42),

The airbag (42) is connected to the inflator (41) via the guide portion (60),

the airbag (42) is provided with an inlet portion (53) which is an inlet of the gas of the airbag (42),

the guide portion (60) includes an expansion portion (60 b) inserted into the inlet portion (53) and disposed inside the airbag (42),

the gas of the inflator (41) flows into the airbag (42) through the expansion portion (60 b),

the expansion part (60 b) expands to a diameter larger than the inlet part (53) of the airbag (42) when the predetermined gas discharge pressure (DeltaP 1) is higher, and the expansion part (60 b) can deform to a diameter smaller than the inlet part (53) of the airbag (42) when the predetermined gas discharge pressure (DeltaP 2) is lower.

2. The airbag apparatus of claim 1, wherein,

the expansion part (60 b) is temporarily fixed to the airbag (42) by a sewing part (62) sewn to the airbag (42),

by the inflation of the airbag (42) by means of gas, the temporary fixation of the sewn portion (62) is released.

3. The airbag apparatus of claim 1, wherein,

the inlet portion (53) extends into the balloon (42),

when the airbag (42) is detached from the guide portion (60), the inlet portion (53) closes the inlet portion (53) by the internal pressure of the airbag (42).

4. The airbag apparatus of claim 3, wherein,

the inflator (41) has an insertion portion (41 a) inserted into the airbag (42), and gas is ejected from the insertion portion (41 a),

the insertion portion (41 a) is located inside the inlet portion (53).

5. An airbag device for a vehicle having an inflator (41) mounted to the vehicle and an airbag (42) connected to the inflator (41), the airbag (42) inflated by gas discharged from the inflator (41) being cut off after inflation, characterized in that,

the airbag (42) has an inlet portion (53) as an inlet for gas of the airbag (42),

the inlet portion (53) extends within the balloon (42),

the inlet portion (53) at least partially overlaps the inflator (41),

the inlet portion (53) is pressed against the inflator (41) by the internal pressure of the airbag (42) in a gas discharge state, and can suppress the airbag (42) from being cut off from the inflator (41).

6. An airbag device for a saddle-type vehicle, which is provided to a saddle-type vehicle (10) equipped with a seat (17) for an occupant,

the airbag device of a saddle-type vehicle is configured by the airbag device of a vehicle according to any one of claims 1 to 5.

7. An airbag device for a standing vehicle, which is provided to a standing vehicle (210) provided with a platform (212) on which an occupant stands,

the airbag device of a standing-ride type vehicle is configured by the airbag device of a vehicle according to any one of claims 1 to 5.