大陆轮胎培训4)TireConstruction.pptVIP

Definition Function Requirements Task / Mechanism Truck Tire Mechanics - Reinforcements Truck Tire Construction Tire Basic Course Tire Construction Passenger Car Truck Tires What is a tire ? What are the requirements ? How does a tire carry load ? How is a tire designed ? What are the main functions of the different parts ? A tire is a complex structural composite which is built up by several rubber and reinforcement-materials, that ? ensures transformation of forces from vehicle to road ? thereby has to resist extreme large deformations for large amount of loading/ -unloading cycles. Tire-size (term): 315 / 80 R 22,5 HSR1 Nominal tire-width / aspect-ratio (hight/width) / “R”=radial tire / nominal rim-diameter / trade-name What does the customer expect from a tire ? Safety Force transfer(vehicle weight, cornering, braking/traction) Air tightness/burst-pressure Rim seating Durability Structural endurance High-Speed (less for truck) Stone retention Comfort Handling Damping Noise Uniformity Economy optimal wear-shape =Mileage Rolling resistance Retreadability Equilibrium in vertical direction: axle LOAD = contact AREA A x PRESSURE pi A tire uses the “membrane” principle: The membrane is provided by carcass-cords airtight liner ? inner air pressure ? carcass tension A pi membrane-tire belted radial-tire with tread F Equilibrium in vertical direction: axle LOAD = contact AREA A x PRESSURE pi ( + stiffness k ) add a belt-package to the tire Truck tire: ?HIGHer axle LOAD ?enlarge footprint AREA = width x length(diameter) ?increase inner PRESSURE (9bar) ? higher carcass force ? enforce material ! Equilibrium in vertical direction: axle LOAD = contact AREA x inner PRESSURE Overload: inner pressure = radial forces Carcass tension caused by inner pressure 18°R 18°L 18°R 50°R 90° Load - Force : axle load - radial cornering - lateral braking/traction - circumferential 0° 25° bending on rim