Method for metallurgically bonding pressed-in cylinder liners to a cylinder block
First Claim
1. A method for metallurgically bonding a cylinder liner to a cylinder block of an internal combustion engine, said method comprising the steps of;
- casting a metal cylinder block (14) having at least one cylindrical wall defining a piston cylinder (16) of fixed inner diameter D1 ;
forming a cylindrical-shaped tubular liner 22 from high wear-resistant metal material having an outer surface diameter D2 slightly larger than the inner diameter D1 of the piston cylinder (16);
applying low melting point molten coating material (24) to one of the outer surface of the liner (22) and the cylinder wall (16);
heating the cylinder block (14) and the liner (22) to an elevated temperature;
and then forcing the liner (22) into the piston cylinder (16) with an interference fit causing the coating material (24) to alloy with the liner and cylinder block metals forming a metallurgically bonded region (46) between the liner (22) and cylinder wall (16), joining the same together.
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Abstract
A method for metallurgically bonding a cylinder liner 22 within a clinder block 14 of an automotive engine includes coating the outer surface of the liner 22 with a low melting point molten metal coating material 24, such as a zinc, as well as cylinder walls of the block 14 and then allowing the coatings to solidify. The block 14 and liner 22 are then heated to an elevated temperature and the liner 22 press-fit into the block 14. This causes the coating materials to alloy with the liner and block metal as well as one another, forming a metallurgical bond between the block 14 and liner 22 when cooled.
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Citations
13 Claims
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1. A method for metallurgically bonding a cylinder liner to a cylinder block of an internal combustion engine, said method comprising the steps of;
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casting a metal cylinder block (14) having at least one cylindrical wall defining a piston cylinder (16) of fixed inner diameter D1 ; forming a cylindrical-shaped tubular liner 22 from high wear-resistant metal material having an outer surface diameter D2 slightly larger than the inner diameter D1 of the piston cylinder (16); applying low melting point molten coating material (24) to one of the outer surface of the liner (22) and the cylinder wall (16); heating the cylinder block (14) and the liner (22) to an elevated temperature; and then forcing the liner (22) into the piston cylinder (16) with an interference fit causing the coating material (24) to alloy with the liner and cylinder block metals forming a metallurgically bonded region (46) between the liner (22) and cylinder wall (16), joining the same together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification