Vehicle safety belt braid

Abstract

The invention discloses a vehicle safety belt braid which is formed by M*N pull expansion units jointed with one another and shown as a continuous belt structure with orthorhombic convexes as a whole, wherein M represents the number of the rows of the pull expansion units included in the braid and N represents the number of the pull expansion units included in a complete row of the braid. The shape of the pull expansion unit is a continuous curved surface with orthorhombic convexes, including four orthorhombic convexes and four subtriangular transitional curved surfaces. When a vehicle has a crash, the braid is impacted by the upper trunk of the human body having acceleration and thereby being stretched longitudinally; and the braid is expanded and deformed transversely due to negative-Poisson ratio pull expansion characteristic, so that the contact area of the braid with the human body is increased. Under the same impact force, the area of force bearing is increased so that pressure on the chest and the stomach of the human body is accordingly reduced; in the way, squeezing to the trunk of a passenger is reduced and damage on the ribs and the viscera is avoided; and secondary harm on the passenger is avoided.

Description

technical field [0001] The invention relates to a vehicle safety belt, in particular to a vehicle safety belt webbing. Background technique [0002] At present, passenger cars widely use three-point seat belts to protect occupants. When the car collides, the occupant is "bound" on the seat through the locked seat belt webbing, limiting the forward movement of the occupant, so as to avoid the occupant's secondary collision with the interior of the car or being thrown out of the car. As the main occupant restraint protection device, the seat belt is currently the most effective automotive passive safety device, which has excellent effects in reducing the number of traffic accident deaths and reducing the degree of occupant injury. [0003] Existing car seat belt webbing is mainly made of nylon or polyester fiber material, with smooth surface, high strength, extensibility and good energy absorption characteristics. However, after the universal safety belt webbing is locked, u...

AI Technical Summary

Problems solved by technology

However, after this universal safety belt webbing is locked, under the action of a large impact acceleration of the human body, it will produce transverse narrowing and deformation due to longitudinal stretching, so that the area of ​​the webbing that acts on the chest and abdomen of the human body is reduced.

When the collision acceleration of the car is high and the impact pressure of the occupant on the webbing is high, the reduction of the area of ​​action of the webbing will generate excessive pressure on the contact torso, which may cause excessive compression of the chest and abdomen of the occupant, and in severe cases, cause damage to internal organs , even life-threatening

Due to the positive Poisson's ratio characteristics of the traditional seat belt webbing material, it cannot overcome the above shortcomings, which reduces the overall protection effect of the seat belt device.

Images