JPH061013U - Vehicle airbag - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an airbag for a vehicle, which can be easily manufactured and can be prevented from protruding when inflated. In an airbag formed by sewing a substantially circular back member and an outer peripheral edge portion of a front member, a substantially circular breathable fabric having an outer peripheral diameter smaller than that of the back member is arranged on a concentric circle of the back member, and The outer peripheral edge of the breathable fabric is sewn to the back member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle airbag that is inflated by gas from a gas generator that operates in an emergency such as a vehicle collision and absorbs an impact of an occupant.

[0002]

[Prior art and its problems]

 An airbag device is a device that inflates and deploys an airbag in a vehicle compartment by high-pressure gas when a sudden deceleration such as a vehicle collision is detected. The airbag body is composed of two substantially circular cloths, a front side member on the occupant side and a back side member on the steering side, and is formed by sewing the outer peripheral edges together. What is formed is known. In this type of airbag, straps (hanging strings) are arranged so that the body of the airbag does not project more than necessary and directly hit the occupant's head or chest. The end of the strap is the front member and the other end. The part is usually sewn to the back member. However, attaching the straps increased the number of sewing points, complicating sewing, and leading to higher costs. An object of the present invention is to provide a vehicle airbag which has the same or higher safety as a strap, since it is not necessary to attach a strap, the number of sewing parts is reduced, the manufacturing process is simplified, and the manufacturing is facilitated. Is to provide.

[0003]

[Means for Solving the Problems]

 The present invention relates to a vehicle airbag in which a substantially circular back member and an outer peripheral edge portion of a front member are sewn together. The breathable fabric is arranged on concentric circles and the outer peripheral edge of the breathable fabric is sewn on.

The present invention will be described below with reference to the drawings. FIG. 1 is an example of a conventional air bag to which a strap is attached. The strap 3 is sewn to the front member 1 and the back member 2. FIG. 2 is a sectional view of an example of the airbag of the present invention. The breathable cloth 4 is arranged on substantially the concentric circles of the back side member 2, and the outer peripheral edge thereof is sewn.

The breathable fabric may have breathability by adjusting the density of the fabric (woven fabric or knitted fabric), or may be provided with a vent hole. Further, the central portion may be non-or low-permeability and the peripheral portion may be breathable. When the cloth itself has air permeability, the air permeability (according to JIS L-1096A method) should be 5 cc / cm ² / sec or more. The size of the breathable fabric should be at least one-third the diameter of the back fabric in order to inflate and deploy the airbag within a given time. Generally, about 2/5 to 4/5 is preferable. In addition, when the air permeability of the peripheral portion is higher than that of the central portion, the gas at the time of inflation flows in the peripheral direction and fills the entire airbag, so that the protrusion phenomenon can be prevented more effectively. Two or more breathable fabrics may be provided in stages.

As a method of sewing the breathable fabric to the back side member, the breathable fabric and the back side member may be overlapped and the outer peripheral edge portion of the breathable fabric may be sewn. Unlike the conventional method of attaching a strap, since it can be made on a flat surface, the automation of sewing is easy and the sewing is simplified. The gas generated from the gas generator must be exhausted to the outside of the airbag after restraining the occupant, but an exhaust hole may be provided in the back side member outside the outer peripheral sewing part of the breathable fabric, and it is not coated. The base cloth may be exhausted by providing a portion. The front member is preferably coated on the front surface, but the coating portion may be partially arranged. A polymer elastomer may be applied or a tape may be applied to the sewn portion of the front side member and the back side member and the sewn portion of the back side member and the breathable cloth for reinforcement.

When a sensor (not shown) detects a vehicle collision or the like, the airbag is inflated and expanded by the high pressure gas generated by the gas generator (not shown) based on the signal from the sensor. First, the gas instantly expands the section partitioned by the breathable cloth and the back surface member, and the breathable cloth plays a role of restricting expansion. Therefore, it does not project more than necessary and does not hit the occupant's head or chest directly. The gas inflates a section separated by the breathable fabric and the back member, and then passes through the breathable fabric to fill the entire airbag with the gas, so that the occupant can be safely restrained.

[0008]

[Effect of device]

 In the airbag of the present invention, it is not necessary to attach a strap, the number of sewing parts can be reduced, the manufacturing process can be simplified and the manufacturing can be facilitated, and the manufacturing cost on the sewing surface can be significantly reduced. it can. Moreover, the airbag is a safe and excellent airbag that does not hit the occupant's head or chest directly due to excessive protrusion of the airbag.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional airbag.

FIG. 2 is a sectional view of the airbag of the present invention.

[Explanation of symbols]

 1 front side member 2 back side member 3 strap 4 breathable fabric

Claims (3)

[Scope of utility model registration request] 1. An airbag formed by sewing a substantially circular back member and an outer peripheral edge portion of a front member together with at least one substantially circular breathable cloth having an outer peripheral diameter smaller than that of the back member and substantially concentric circles of the back member. An air bag for a vehicle, which is disposed on the upper surface and has an outer peripheral edge portion of the breathable cloth sewn to a back member. 2. The size of the breathable fabric is 3 times the diameter of the back side member.
The air bag for a vehicle according to claim 1, wherein the air bag is one-third or more. 3. The vehicle airbag according to claim 1, wherein the breathability of the breathable fabric mainly depends on the peripheral portion.