Seat Belts

Question 1

What is the purpose of a 3 point Inertia reel seat belt?

Answer 1

Locks at certain retardation threshold, absorbs energy at modest speeds - has 3 anchor points

Question 2

What is the disadvantage of a 3 point inertia reel seat belt?

Answer 2

Provides limited protection at higher speeds

Can not guarantee the occupants will not hit the steering wheel or dash board

Question 3

What does the mechanical seat belt tensioner compensate for?

Answer 3

Belt slack and stretch

Question 4

What does the mechanical seat belt tensioner do?

Answer 4

Automatically retracts and tightens seat belt in an accident

Located under the seat , do not always operate in conjunction with airbag

Question 5

How does a mechanical seat belt tensioner work?

Answer 5

Inertia/latching detects deceleration

Spring under compression is released

Spring pulls on cable and tensions seat belt buckle to give restraint

Question 6

Where is the electronic/pyrotechnic seat belt tensioner located?

Answer 6

In the door pillars

Question 7

What component stores the energy used to tension the seat belt in a mechanical pre tensioner?

Answer 7

A coil spring under compression