Patent ID: 6491010
Filing Date: 2002-12-10
Classification: F01L,F01M,F02B

Abstract:
An over-head cam type V-type engine comprising:a crank case having a crank chamber; a crank shaft provided to penetrate through the crank chamber; a first cylinder and a second cylinder provided in an upper portion of the crank chamber to be positioned on virtual lines extending like a V-shape upward from a center of the crank shaft as seen in an axial direction of the crank shaft, respectively; a cam shaft provided in a head portion of each of the first and second cylinders; an intermediate shaft provided above the crank shaft to penetrate through the crank chamber; a first transmitting means for transmitting a rotation of the crank shaft to the intermediate shaft through a chain at one of end sides of the intermediate shaft; a chain chamber formed adjacently to a side portion of the crank chamber and serving to accommodate the first transmitting means; a second transmitting means for transmitting a rotation of the intermediate shaft to the cam shaft of one of the first and second cylinders through a chain at the other end side of the intermediate shaft; a first chain tunnel for accommodating the second transmitting means; a third transmitting means for transmitting the rotation of the intermediate shaft to the cam shaft of the other cylinder through a chain at one of the end sides of the intermediate shaft; a second chain tunnel for accommodating the third transmitting means; an oil sump formed in a lower portion of the crank case and serving to accumulate a lubricating oil therein; a forcible oil supply means for supplying the lubricating oil from the oil sump to the head portion of each of the first and second cylinders such that each cam shaft is lubricated; a first lubricating oil feedback path formed such that the lubricating oil supplied to the head portion of one of the first and second cylinders flows down into the oil sump through the first chain tunnel and the crank chamber; and a second lubricating oil feedback path formed such that the lubricating oil supplied to the head portion of the other cylinder flows down into the oil sump through the second chain tunnel and the chain chamber.