The output work of the engine is driven four stroke ic engine pdf this cam. Cam engines have been a success. The first engine to get an airworthiness certificate from the United States government was, in fact, a radial cam engine.

Hydraulic motors, particularly the swashplate form, are widely and successfully used. Internal combustion engines, though, remain almost unknown. In a two-stroke engine, the forces on the piston act uniformly downwards, throughout the cycle. The simple cam mechanism only works with a force in one direction. Usually, only one cam is required, even for multiple cylinders.

It runs as smoothly as an electric motor. IC engine” and one will find that the combustion event ideally should be a more-or-less “constant volume event”. The short dwell time that a crank produces does not provide a more-or-less constant volume for the combustion event to take place in. Also, the quickly descending piston lowers the pressure ahead of the flame front, reducing the burn time.

This means less time to burn under lower pressure. This dynamic is why in all crank engines a significant amount of the fuel is burned not above the piston, where its power can be extracted, but in the catalytic converter, which only produces heat. To suggest that cam engines were or are a failure as far as being robust is in error. After extensive testing by the United States government, the Fairchild Model 447-C radial-cam engine had the distinction of receiving the very first Department of Commerce Approved Type Certificate. At a time when aircraft crank engine had a life of 30 to 50 hours, the Model 447-C was far more robust than any other aircraft engine then in production. Sadly, in this pre-CNC age it had a very poor cam profile, which meant it shook too severely for the wood propellers and the wood, wire, and cloth airframes of the time. One advantage is that the bearing surface area can be larger than for a crankshaft.

In the early days of bearing material development, the reduced bearing pressure this allowed could give better reliability. Unlike a crankshaft, a cam may easily have more than one throw per rotation. This allows more than one piston stroke per revolution. In practice, the cam engine design weighed more than the combination of a conventional engine and gearbox. The only internal combustion cam engines that have been remotely successful were the swashplate engines. The purpose of such engines was usually to achieve this axial or “barrel” layout, making an engine with a very compact frontal area.