Cylinder cover bottom drilling cooling structure

The utility model relates to a cylinder-head bottom drilling cooling structure which belongs to a sealing device of a combustion engine and consists of an integrative cylinder-head body. The utility model is characterized in that at least two groups of cooling water via-holes are transversely processed on the water channel wall on the bottom of the cylinder-head body and the cooling water via-holes are distributed in a cross shape. The utility model makes the improvements on existing techniques. Because the cooling water via-holes are transversely processed on bottom of the water channel wall 2 of the cylinder-head body 1, the utility model therefore changes the direction of the cooling water in the water channel, changes unidirectional recurrent type cooling into multi-directional circulating type cooling in a manner of concentrated forced cooling from around the water channel to the centre thereof. Thus, the cooling effect of the cooling water is enhanced and the cooling of the lower part of an airway is re