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Performance of a Cam-Type Pulse Continuously Variable Transmission

Pabiszczak Stanisław

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 1

280--290

The aim of this paper is to assess the performance parameters of the cam-type pulse Continuously Variable Transmission, which is a first attempt to investigate this issue in the presented manner. The transmission under investigation comprises two cams in cooperation with two units, each consisting of rollers connected to swing rods mounted on overrunning clutches. To accomplish this, a test stand was built and a detailed testing program was developed takes into consideration the influence of gear ratio, rotational speed, and load on the uniformity of motion and efficiency. Analysis of the obtained results leads to the conclusion that the tested CVT is particularly sensitive to changes in operating conditions, and its overall performance deteriorates as the reduction ratio increases. The best results were achieved with a load below the nominal one, at low rotational speeds and a low speed reduction. The transmission’s structure design and operational principle result in significant power losses, as evidenced by an efficiency rating of less than 60%.

Effect of Manufacturing Errors on the Operation of the Eccentric Rolling Transmission

Pabiszczak Stanisław, Ptaszyński Wojciech

Advances in Science and Technology. Research Journal

2020

Vol. 14, no 3

213--222

The eccentric rolling transmission consists of rolling bearings mounted eccentrically on the input shaft, cooperating with cam wheels, which are mounted on the output shaft. The aim of this paper was to determine the sensitivity of the transmission to the manufacturing errors of the cam wheel. Two methods of cam wheels milling using a universal CNC machining center were proposed. The measurements of manufactured wheels were performed using a blue light 3D scanner, which allowed the determination of geometric dimensions and deviations from nominal geometry. The experimental research of the eccentric rolling transmission prototype equipped with manufactured cam wheels was conducted, measuring the torque on the gear shafts as a function of its angular position. On the basis of the obtained results, the impact of manufacturing errors on the operation of the transmission unit was examined, especially in terms of torque and efficiency. It was indicated that the machining using ball nose end mill ensures sufficient accuracy of the cam wheels.