Sleeveless cylinder block without marginal plating coating
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorMasao Koriyama
Life of this patent
Estimating the term…
Abstract
A sleeveless cylinder block for an automobile engine, motorcycle engine or the like having at least one cylinder such as that made of an aluminum ally, the inside surface of which is plated, is characterized in that a marginal portion from the bottom end of the inside surface of the cylinder on the side of the cylinder skirt and the remaining part of the cylinder block lower than the marginal portion are not plated, whereby only a target area inside the cylinder is securely plated, and further the area between the bottom of the cylinder and the cylinder skirt is strengthened.
Claims6
A sleeveless cylinder block formed from a material selected from the group of aluminum and aluminum alloys and having at least one cylinder bore, the inside surface of said cylinder bore swept by a piston through its stroke being plated by electroplating, wherein a marginal portion from the bottom end of the inside surface of said cylinder bore on the side of a cylinder skirt and the remaining part of the cylinder block lower than the portion of the cylinder bore swept by the piston are not plated, said portion having a width of 2-20 mm for permitting the formation of a liquid seal of said portion during the plating process.
Dependencies are inferred from the claim text.