As the demand for improved automotive environmental performance increases, manufacturers are focusing on the CVT (Continuously Variable Transmission) as a transmission type enabling the achievement of a balance between driving performance and fuel efficiency. In terms of driving performance, CVT offers quietness and smooth acceleration without shift shock. Given this, the requirement to extend the transmission capacity of CVT will increase in future. From the perspective of the maximum input torque that is transmitted to the drive train, the most severe demands are made on the CVT at start-up operation. The pulleys and metal pushing V-belt of a CVT with a torque converter are subjected to a sudden rapid increase in pulley thrust from a stationary state, and are required to transmit maximum torque with minimal time lag. The most important consideration at this time is the dynamic strength of the metal pushing V-belt. Dynamic strength cannot be determined simply from the maximum input torque, but must be determined in relation to the shift ratio, pulley piston pressure as well as the rated speed in time history. This paper reports on research that has succeeded, using a new simulation, in clarifying the stress history on the element neck under transient operating condition at CVT start-up. These results suggest that the compression stress generated by the load on the V surface is a fundamental component of element stress, and that bending stress generated by the pushing force between the elements is superimposed on this stress. A comparison of simulation results with test results for the load distribution on the element, conducted to confirm the accuracy of the simulation, demonstrated good qualitative correlation. This paper also discusses the method used to evaluate dynamic strength in response to transient stress and the application to a variety of vehicle startup conditions to make it possible to determine operating conditions by considering the dynamic strength of the belt.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Stress simulation on elements of metal pushing V-belt for fatigue strength under transient operating conditions


    Additional title:

    Spannungssimulation der Elemente eines Metallkeilriemens zur Bestimmung der Dauerfestigkeit unter transienten Betriebsbedingungen


    Contributors:


    Publication date :

    2008


    Size :

    12 Seiten, 16 Bilder, 10 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    F2008-12-076 STRESS SIMULATION ON ELEMENTS OF METAL PUSHING V-BELT FOR FATIGUE STRENGTH UNDER TRANSIENT OPERATING CONDITIONS

    Saito, T. / International Federation of Automobile Engineers' and Technicians' Associations | British Library Conference Proceedings | 2008


    Stress Simulation on Elements of Metal Pushing V-belt Under CVT Transient Operating Condition

    Saito, T. / Society of Automotive Engineers of Japan | British Library Conference Proceedings | 2007




    Application of stress simulation under transient condition for metal pushing V-belt of CVT

    Saito,T. / Honda Research and Development,JP | Automotive engineering | 2008