Cardan and double Cardan homokinetic joints have a wide spectrum of application in vehicle design. This paper proposes mathematical models for mechanical efficiency and torque analysis and presents different analytical tools and procedures to be used for ascertaining the influence of the main working parameters (rotation speed, angular misalignment, transmitted torque) on the kinematic, dynamic and structural performances of the joint. The problem of fatigue analysis has been adressed. In particular, it has been investigated the influence of working parameters on the life expenctancy of the joint. design charts have been prepared for a ready use of the proposed models. It has been shown that the amplitude of torque variations due to the inertia effects is more affected by the rotation speed than by the angular misalignment beta between shafts. As far as fatigue analysis is concerned, a code has been developed for the purpose of stress analysis by means of finite elements models. These models have shown that the critical region is near the holes of yokes. The application of ANSI/AGMA norm criterion has shown that increasing rotational velocity causes an assessed-life reduction more than increasing angular misalignment or increasing transmitted torque. This can be explained considering that higher rotational velocity increases the alternate stress rate which reduces Fsy more than the increasing of mean stress caused by higher torque. Also a higher angular misalignment beta increases the alternate stress rate but in usual working range (0-10 deg of angle) this effect is not as relevant as that of changing rotational velocity.
Dynamic, mechanical efficiency, and fatigue analysis of the double Cardan homokinetic joint
Dynamik, mechanischer Wirkungsgrad und Ermüdungsanalyse eines doppelten homokinetischen Kardangelenks
International Journal of Vehicle Design ; 32 , 3/4 ; 231-249
2003
19 Seiten, 13 Bilder, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
Cardangelenk , Materialermüdung , Dynamik , dynamisches Verhalten , theoretisches Modell , Anwendung im Fahrzeugbau , mechanischer Wirkungsgrad , Lebenserwartung , Konstruktionsmethodik , Spannungsanalyse , Finite-Elemente-Methode , mathematisches Modell , Winkelgeschwindigkeit , Achsversetzung , Drehmoment , Betriebsverhalten
Dynamic, mechanical efficiency, and fatigue analysis of the double cardan homokinetic joint
Kraftfahrwesen | 2003
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Online Contents | 2003
|Determination of the life of an homokinetic joint
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|Double Cardan Constant Velocity Universal Joint
SAE Technical Papers | 1974
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