Patent ID: 6736090
Filing Date: 2004-05-18
Classification: F01L,F02B,F02G

Abstract:
An engine, having a valve device, said engine having a cylinder into which a fluid is supplied, a piston mounted in said cylinder, and a valve for providing switching between suction and exhaust of a pressure fluid to and from said cylinder, said valve device comprising:a valve seat defined by an opening for fluid inflow formed in an end face of said cylinder, said opening being smaller in area than an end face of said piston; and a valve disc arranged outside of said valve seat, said valve disc coming into abutment against said valve seat, wherein said cylinder is movable in its axial direction, said end face of said cylinder being capable of coming into or out of contact with said valve disc, wherein when an interior of said cylinder is pressurized as a result of abutment of said valve seat against said valve disc, said end face of said cylinder is urged toward said valve disc so that said valve seat and said valve disc are brought into press-contact with each other, wherein movement of said cylinder is controlled by movement of said piston, wherein â€ƒsaid cylinder includes an upper cylinder and a lower cylinder, said upper cylinder being urged downward, said lower cylinder being urged upward, and said lower cylinder having a lower end at which it has a raised portion against which a lower end of said piston abuts, wherein â€ƒwhen said piston rises, said lower cylinder also rises and thrusts up said upper cylinder to close said valve seat so that said valve seat comes into press-contact with said valve disc when the interior of said cylinder is pressurized, and wherein â€ƒwhen said piston falls, said lower cylinder is disengaged from said upper cylinder so that an outlet is formed between said upper cylinder and said lower cylinder and that said valve seat is opened to form an opening.