Patent ID: 6763801
Filing Date: 2004-07-20
Classification: F01M,F02B

Abstract:
In a four-stroke reciprocating piston-type internal combustion engine comprising:a cylinder block having a plurality of cylinders, each of said cylinders accommodating a piston slidably received therewithin to define a combustion chamber, each of said combustion chambers communicating in a tied manner through a first valve means with a source of fuel-air mixture to admit said mixture into said combustion chamber; and each of said combustion chambers further communicating in a timed manner through a second valve means with an exit port to withdraw exhaust gases from said combustion chamber; connecting rods connecting said pistons to a crankshaft; a crankcase defined within said cylinder block accommodating said crankshaft, said crankcase having journal supporting means; wherein each of said journal supporting means accommodates means for distributing liquid lubrication to bearings received by said journal supporting means; an oil reservoir in the interior of said block; an air and fuel intake system coupled to said cylinders; the improvement comprising sealing means providing a substantially airtight seal separating said oil reservoir from the remaining interior volume of said engine, thereby defining at least one compression chamber in the interior volume of said block in communication with the lower surface of at least one of said pistons; a first one-way valve means adapted on said block in communication with said compression chamber for admitting air from the atmosphere into said compression chamber by action of said piston; a second one-way valve means adapted on said block for releasing air from said compression chamber to be directed to said air and fuel intake system.