Cylinder block structure of an internal combustion engine

Claim 1

In a cylinder block structure of an internal combustion engine including an outer wall of said cylinder block, a water jacket wall formed integrally with said outer wall and having portions intermediate the top and bottom of said cylinder block extending in spaced relation to said outer wall, the outer wall of said cylinder block and said intermediate portions of said water jacket wall forming a tappet chamber therebetween with a depth extending from the top of the cylinder block to a wall containing a tappet seat, and a plurality of cylinder liners disposed with said water jacket wall, the improvement for the reduction of noise and vibrations in the walls of said tappet chamber comprising: a plurality of solid substantially cylindrically-shaped strut means in the tappet chamber extending between the water jacket wall and connecting with surfaces of the outer wall of said cylinder block, each solid strut means being provided between adjacent cylinder liners and disposed approximately at half the depth of the tappet chamber where maximum vibration tends to occur when the engine is in operation, whereby noise and vibrations of the cylinder block are significantly reduced.