Abstract: An air bag device on a two-wheeled motor vehicle including a body frame, a fuel tank and a seat. The air bag device comprises a housing, an air bag, a base plate and an inflator. The device is mounted to the body frame of the vehicle in a space between a rear portion of the fuel tank and a front portion of the seat.

Abstract: An air bag device for a motorcycle deploys to cushion an impact to a rider of the motorcycle during a collision. The air bag device is mounted to a body frame of the motorcycle in front of the rider. Bag anchoring members provide a connection between the air bag and the body frame. During deployment of the air bag, the bag anchoring members deploy from grooves in the motorcycle's fuel tank, and extend together with the air bag to hold the air bag securely to the frame body.

Abstract: A valve for regulating the pressure of an air bag for a two-wheeled motor vehicle is provided. The valve regulates the internal pressure of the air bag to restrain a rider effectively. The pressure-regulating valve is disposed in a vent hole formed in the air bag. When the internal pressure of the air bag exceeds a predetermined value, the vent hole is opened. When the internal pressure drops to the predetermined value, the vent hole is closed to maintain the air bag in a half-expanded state so that the rider continues to be cushioned against shocks of a crash.