Simulation of cam-based infinitely variable transmission

Abstract

Infinitely variable transmission (IVT) is a system that gives a continuous (non-discrete) variation that includes zero in transmission ratios between two rotating elements. In this paper, a cam based IVT mechanism was designed and simulated using SolidWorks software containing two identical units. Each unit included a cam with a follower and oscillatory slotted links pivoted at a hinge that could be moved vertically by altering the transmission ratio, achieved by using a hydraulic ram or a power screw. system units also include a grooved wheel and a follower or actuator. During operation, the grooved wheels displayed an oscillating rotational motion, so that they are connected to the output shaft via one-way clutches (ratchets) to give the output shafts one-way directional motion. The cam profiles are designed and investigated within the system with regards to performance. A combination of uniform velocity and 1-5 polynomial profiles where selected and designed for the current study In general, the results obtained from the simulation showed compatibility with the expected theoretical results derived from the design of the current IVT system. These results indicated uniform velocity during the power stroke in each unit for all parts in the units. However, the ratchets used in this study produced a noticeable fluctuation in the angular velocity of the output shaft, and further work on the selection and development of more efficient ratchets is thus strongly recommended.

Performance of a Cam-Type Pulse Continuously Variable Transmission

“…Transmissions equipped with planetary pawls, planetary gears or switch plates are discussed in [15,16]. Additionally, there are designs that mechanism with a spatial cam with a planetary gear [17,18] or combine a cam-follower with a grooved wheel-follower [19,20]. The pulse CVT category also includes the transmission described in [21], which transmits drive by controlling the engagement time of compact non-slip clutches (e.g., dog clutches).…”