Air bag device for protecting knee and crus

Abstract

The invention provides an airbag device for protecting knees and legs, which comprises a module frame. An air bag and a decoration cover for air charging system are arranged in the module frame, and a decoration cover is arranged on the module frame. The invention is characterized in that the two secondary air chambers are symmetrically arranged at two sides of the lower part of the air bag, anda notch is provided in the middle area of the lower part of the air bag; the two secondary air chambers are respectively folded into a main air chamber at the upper part of the air bag; an isolation strip is respectively arranged between the secondary air chambers and the main air chamber. When the air charge is performed, the main air chamber arranged at the upper part of the air bag is first fully charged to ensure the protection for the knees. Then, the main air chamber is continuously charged to extend the secondary air chamber so as to prevent the legs from directly contacting with the lower part of a dashboard, thereby reducing the harm to the legs, simultaneously increasing the contact area between the legs and the knees, and protecting the legs and the knees more effectively. As the broken notch is provided in the middle area of the lower part of the air bag, the airbag is kept away from the decoration cover when being extended, thus ensuring that the air bag is extended in the required direction.

Description

technical field [0001] The invention relates to a knee airbag device equipped on an automobile, in particular to an airbag device for protecting knees and lower legs. Background technique [0002] The knee airbag is placed under the dashboard assembly of the car, which can prevent the passenger's knees and calves from being hit by hard objects in the car, such as the impact on the lower part of the dashboard in the car, in a frontal collision accident. When a collision occurs, the knee air bag device will inflate the air bag through the inflator. After the knee airbag is fully deployed from the lower part of the dashboard, the knee airbag will cover the lower surface of the dashboard to protect the passenger's knees and lower legs. [0003] The traditional knee airbag is usually composed of an airbag, an inflator, a module bracket and a decorative cover. There are two deployment methods: one is that the airbag is fully deployed upwards. Since the installation height of the ...

AI Technical Summary

Problems solved by technology

[0003] The traditional knee airbag is usually composed of an airbag, an inflator, a module bracket and a decorative cover. There are two deployment methods: one is that the airbag is fully deployed upwards. Since the installation height of the module bracket is limited, the protection area is small. , is limited to the protection of the knee, and cannot effectively protect the calf; another kind of air bag is deployed up and down at the same time, when the lower part is deployed, due to the interference of the decorative cover, it cannot be deployed in the required direction; in addition, due to the upper and lower parts of the air bag The expansion of the area is carried out at the same time, and the deployment time of the upper area cannot be guaranteed, so the knee and lower leg cannot be well protected

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