Cylinder barrel inside surface treatment apparatus and method

Abstract

A cylinder barrel inside surface treatment apparatus for providing a uniform treatment finish is disclosed. The treatment apparatus includes a pallet on which a cylinder block is placed with a gasket surface faced upward. A top opening of a cylinder barrel of the cylinder block is covered by a cover member having a concave portion communicating with the top opening. A nozzle having treatment solution spray holes is attached to the cover member. The treatment solution is sprayed toward a wall of the concave portion from the treatment solution spray holes and flows along the wall from a top end to a bottom end of the cylinder barrel inside surface.

1 . A cylinder barrel inside surface treatment apparatus for causing a treatment solution to come into contact with an inside surface of a cylinder barrel provided to a cylinder block of an internal combustion engine and treating the cylinder barrel inside surface, the apparatus comprising:
 a pallet for supporting the cylinder block with a gasket surface of the cylinder block faced upward, and closing off a bottom opening of the cylinder barrel;   a first drainage passage provided to the pallet for discharging a portion of the treatment solution accumulated in the cylinder barrel;   a cover member placed on the gasket surface for covering a top opening of the cylinder barrel and having at a bottom thereof a concave portion communicating with the top opening of the cylinder barrel;   a nozzle inserted from above downward into and attached to the cover member and having treatment solution spray holes for spraying the treatment solution toward a wall of the concave portion so as to feed the treatment solution to the inside surface of the cylinder barrel along the concave portion wall; and   a second drainage passage provided in the cover member for discharging the remaining treatment solution accumulated in the cylinder barrel.   
     
     
         2 . The treatment apparatus of  claim 1 , wherein the treatment solution spray holes are positioned upwardly of a top edge of the cylinder block. 
     
     
         3 . The treatment apparatus of  claim 1 , wherein the pallet has on a top surface thereof a positioning pin designed to be engaged in a hole formed in the cylinder block. 
     
     
         4 . A cylinder barrel inside surface treatment method for causing a treatment solution to come into contact with an inside surface of a cylinder barrel provided to a cylinder block of an internal combustion engine and treating the cylinder barrel inside surface, the method comprising the steps of:
 placing the cylinder block, with a gasket surface thereof faced upward, on a pallet for closing off a bottom opening of the cylinder barrel;   covering, while inserting a treatment solution feeding nozzle into a top opening of the cylinder barrel, the cylinder barrel top opening with a cover member having at a bottom thereof a concave portion communicating with the cylinder barrel top opening;   spraying the treatment solution toward a wall of the concave portion from treatment solution spray holes provided to the nozzle so as to feed the treatment solution along the wall of the concave portion to the cylinder barrel inside surface; and   discharging a portion of the treatment solution accumulated in the cylinder barrel from a first drainage passage provided to the pallet and discharging a remaining part of the treatment solution accumulated in the cylinder barrel from a second drainage passage provided to the cover member.   
     
     
         5 . The treatment method of  claim 4 , wherein the treatment solution is fed from a top end to a bottom end of the inside surface of the cylinder barrel.