Abstract
A new type driven valve system for combustion engines has been presented, in which an actuator consists of a conical coil spring, a hollow motor and a screw. In the system, initial compressions and spring constant are controlled by an actuator. Hence, the resisting torque and the energy loss in a low-speed rotation are small in this system in comparison with normal engines. In addition, the jump and bounce phenomena in a high-speed rotation are suppressed by controlling initial compression and spring constant. The analysis for obtaining the jump and bounce phenomena of the present valve system has been presented. To validate the present valve system and the analysis, experimental tests have been carried out. It is ascertained that the load torque can be decreased, and initial compressions and spring constants can be controlled. The jump and bounce phenomena obtained by this analysis almost coincide with the experimental data.
