JP2009234581A5

JP2009234581A5 -

Info

Publication number: JP2009234581A5
Application number: JP2009170000A
Authority: JP
Filing date: 2009-07-21
Publication date: 2010-02-04

Claims

A seat belt that restrains the occupant to the seat;
A reel shaft that rotates a reel that winds up the seat belt and plastically deforms when a tension that pulls out the seat belt from the reel exceeds a predetermined value ;
First and second tension varying means for varying the tension of the seat belt;
A lock mechanism that prevents rotation of the reel shaft in the pull-out direction and allows rotation in the take-up direction in the event of a collision ;
A collision prediction means for predicting a collision of a vehicle and outputting a collision prediction signal according to the possibility of the collision;
Collision detection means for detecting a vehicle collision and outputting a collision detection signal;
An airbag device that deploys an airbag according to the collision detection signal and prevents a secondary collision of an occupant;
Control means for controlling the first and second tension variable means by the collision prediction signal and the collision detection signal,
The control means receives the collision prediction signal and operates the first tension varying means to remove excessive slack of the seat belt before the collision, and further receives the collision detection signal to receive the second tension. By completing the winding of the seat belt before the inertial force by the occupant acts on the seat belt by operating the variable means ,
A seat belt device configured to avoid contact between an occupant moving by pulling out a seat belt from the reel due to plastic deformation of the reel shaft and the airbag in the middle of deployment by the collision detection signal .

The first tension varying means pulls the seat belt by a motor ,
2. The seat belt device according to claim 1, wherein the second tension varying means rapidly pulls in the seat belt by gas pressure .

The seat belt device according to claim 1 or 2, wherein both the first tension varying means and the second tension varying means are configured to rotate a reel that winds up the seat belt.

When the predetermined deceleration acts on the vehicle, when the seat belt is pulled out at a predetermined acceleration, or when a command signal is supplied from the control unit that has received the collision prediction signal The seat belt device according to any one of claims 1 to 3, which operates .