Gears can be grouped into two major categories: those that operate in pairs to connect parallel shafts and those that connect nonparallel shafts. Parallel types include spur and helical.

One of the major technological changes has been the evolution from standard parallel axis gear trains, to planetary gear trains, to planetary gear trains that use roller gears. How do they compare ...

With a patent application for a parallel-twin engine coupled to a belt-operated CVT, CFMoto now looks set to join the party. A continuously variable gearbox permits an infinite number of effective ...