Introduction

 

 

Since the very first internal combustion engine was built, there has been a need to control the time and quantity of gas or vapor flow into the engine. This is only possible with the existence of a valve system.

 

The most conventional valve system is the cam-controlled poppet valve. Due to the engineering knowledge and the development over the years of this system, it is allowed to say that the poppet valve system has achieved a remarkable state of perfection although there is still scope for improvement or for the appearance of a new system.

 

To build an alternative system to the one already existent, certain aspects must be taken into consideration. The new system can’t be more expensive than the poppet valve, has to be simpler and correct the disadvantages of this last one.

 

Therefore, the rotary valve was developed. This innovative system is much simpler than the poppet valve and doesn’t need half of its components. Other advantages include the low vibration, noise and the possibility of having bigger pressures thanks to a smaller head of the cylinder which means more power.

 

Like the poppet valve, the rotary valve system can be improved, which is the aim of this project. This project presents a study and an analysis of a trapezoidal valve system which makes it possible to adjust the intake area according to the charge applied.