Patent ID: 7100548

Claim:
A V-type 8-cylinder four cycle internal combustion engine with a bank angle of 90 degrees, comprising: a first group of four pistons respectively received in cylinders formed in a first bank; a second group of four pistons respectively received in cylinders defined in a second bank; a crankshaft including four throws each having a crank pin; a first group of four upper links each having one end pivotally connected to one of the pistons of the first group; a second group of four upper links each having one end pivotally connected to one of the pistons of the second group; a first group of four lower links rotatably and respectively supported by the four crank pins of the throws of the crankshaft, each lower link of the first group having one end pivotally connected to the other end of the corresponding upper link of the first group; a second group of four lower links rotatably and respectively supported by the four crank pins of the throws of the crankshaft, each lower link of the second group having one end pivotally connected to the other end of the corresponding upper link of the second group; a first group of four control links each having one end pivotally connected to the other end of the corresponding lower link of the first group and the other end pivotally connected to a cylinder block; and a second group of four control links each having one end pivotally connected to the other end of the corresponding lower link of the second group and the other end pivotally connected to the cylinder block, wherein each piston is pivotally connected to the corresponding upper link through a piston pin.