Front seat belt retractor, its mount on the bottom of the middle pillar of the body
Holder with lock - front seat belt, fixed to the seat
Height adjustable front seat belt hook on B-pillar
Front seat belt lock and its operation diagram
1 – mechanical starter; 2 – winding mechanism; 3 – the first gas generator; 4 – rotary piston; a – ignition of the first gas generator; b – first bypass channel; c – second gas generator; d – second bypass channel; e – third gas generator; f – outlet channel; g – rotary piston
Rear seat belt retractor
Rear seat belt mount on the side of the body
In accordance with the agreement on the operation of vehicles and international instructions, the manufacturer supplies Skoda Octavia cars with seat belts for all five seats. There are two types of front seat belts. The first version of the belts is self-winding, the second version is self-winding belts with a lock. The second version is mandatory for cars equipped with airbags. The front seat belts are three-point. The winding device is installed in the cavity of the lower part of the middle pillar of the body (see fig. Front seat belt retractor its fastening on the middle pillar of the body at the bottom). The upper grip on the middle pillar is height-adjustable. The belt lock is located on the front seat frame (see Fig. Holder with lock – front seat belt, fixed to the seat). The mounting bolts and grips have a 7/1620 UNF-2A thread, which corresponds to international standards. The tightening torque of these bolts is 35 Nm.
It is worth mentioning the upper grip of the belt towing device, installed on the sliding holder. It is an integral part of the leading profile, secured with three pairs of hooks pre-pressed into the middle post. The leading profile is screwed to the post with one bolt. The belt towing device (loop) is secured to the sliding holder with a bolt. The bolt is covered with a plastic cover. After folding the towing device, the sliding holder can be moved in the bar. The middle position of folding is held by a flat spring. The bar has five fixed positions of movement in height with a total range of 94 mm (see fig. Height-adjustable front seat belt catch on the B-pillar). Once released from the lock, the belt is automatically wound onto the winding element.
In the second version, i.e. belts with a blocker, all parts are similar except for the winding device. It is combined with the blocker.
The task of the blocker is to instantly tighten the seat belt if the car decelerates for 10 milliseconds to a value greater than 5 g (g = 9.81 m/sq. sec. – acceleration of gravity). If the blocker is activated, the belt is wound up by almost 120 mm. The necessary force is generated by a system of gas generators.
The figure Front seat belt lock and its operation diagram shows the diagram of the winder with the lock. The lock operates on the principle of a rotary piston with three working chambers and three gas generators. The lock function is initiated by a mechanical sensor when the above-mentioned vehicle deceleration values are reached. The first generator is ignited by mechanical action of the striker on the impact fuse. The gas explosion sets the rotary piston in motion. When the working pressure reaches the first bypass and outlet channel, the second generator is ignited again by the striker. The gas pressure rotates the rotary piston. When the second bypass and outlet channel is reached, the process is repeated - the third gas generator is ignited. Thus, the piston will receive a third impulse and, having turned, will approach the last lower dead center. The belt will be locked in 13 milliseconds.
The seat belts for both rear outer seats are also three-point and self-tensioning (see fig. Rear seat belt retractor, fig. Rear seat belt mount on the side of the vehicle). The rear middle seat is equipped only with a two-point lap belt with a manually adjustable length.
If the belts have been in an accident, they must be replaced with new ones during repairs, including the winding device. The same must be done in case of damage to the belt or its parts. If the blockers have been in operation, the seat belts must ALWAYS be replaced with new ones entirely. Seat belts must not be disassembled. In fact, any unqualified installation and removal of belts is prohibited, the crown strap can only be cleaned without removing it from the car, namely with ordinary detergents intended for washing textiles made of artificial fibers.