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2007-10-30
Technical Paper
2007-32-0082
David A. Mower, Robert H. Todd
In research conducted at Brigham Young University, four coatings were tested for their ability to increase the wear life of primary clutch sheaves made of A390 die-cast aluminum used in continuously variable transmissions (CVT). The coatings tested were: hard chrome, electroless nickel metal, hard coat anodizing and composite ceramic coating. A wear test stand was developed to duplicate wear found on CVTs currently in use. The wear was evaluated using four methods. The test first method characterized the shift delay properties of the worn CVTs while running on the wear test stand. As the CVT was run on the wear test stand a delay in shifting would develop during the unloading cycles. The second method used an ATV and chassis dynamometer to evaluate the change in performance with wear. The third method used a profilometer to evaluate the amount of material lost, through wear.
2004-09-27
Technical Paper
2004-32-0078
Aaron Robison, Roger Raymond, Zac Hale, Robert H. Todd
Modifications to continuously variable transmissions (CVT) are presented in order to improve overall performance in recreational vehicles. A computer controlled CVT would eliminate performance-inhibiting compromises currently imposed by mechanical sensors and actuators. The authors propose a computer controlled CVT to obtain improved performance. This paper considers a snowmobile modification that is a stepping-stone towards a fully computer controlled CVT. External force was applied with a pneumatic cylinder and four bar linkage to the driven pulley to vary sheave pressure and override the natural shift pattern. An external force of 431 N increased track speed 59% during hill climb testing. Ultimately, a microprocessor would use input signals from track speed, engine speed, and throttle position to shift the CVT to obtain maximum performance.
2000-09-11
Technical Paper
2000-01-2651
Brent Zollinger, Robert H. Todd
This paper uses a case study to demonstrate how focusing on customer needs improves the success of product designs in the marketplace. A sampling of trends in modern design is presented, showcasing some methodologies that facilitate effective design. The work of the Brigham Young University mini-baja vehicle design team is studied. The team used a customer-focused design by developing the product specification directly from customer statements, and using matrices to evaluate the capacity of concepts to meet the specification. Lessons learned from the design process are considered.
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