Method of joining cylinder bore liners to an engine block

Internal-combustion engines – Particular piston and enclosing cylinder construction – Cylinder detail

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123668, 123669, 29888061, F02F 100

Patent

active

049862308

ABSTRACT:
Method of bonding cylinder liners to cylinder bore walls, comprising: (a) inserting a cylindrical work hardenable liner into a complementary sized cylindrical bore wall of the block, with a uniform annular radial spacing therebetween of about 0.005 inch; and (b) forcing a nondeformable mandrel throughout the interior length of the cylindrical liner to uniformly circumferentially expand the radially outer surface of the liner into full annular surface-to-surface heat exchange relationship with the interior surface of the bore wall, the mandrel having a cross-sectional radius greater than the interior radius of the liner by a dimension which is at least 0.001 inch in excess of such radial spacing. Preferably, the cylindrical liner is comprised of steel having a ductility of at least 30%, a hardness of at least 35 HRB, and a wall thickness in the range of 0.050-0.250. The mandrel is preferably formed as a spherical element by a process of pressing and sintering followed by precise grinding to shape, and has a hardness greater than either the liner or bore wall.

REFERENCES:
patent: 1402508 (1922-01-01), Lathrop
patent: 1722389 (1929-07-01), Opie et al.
patent: 2353774 (1944-07-01), Wagner
patent: 2435837 (1948-02-01), Larson
patent: 2613431 (1952-10-01), McGee
patent: 3372452 (1968-03-01), Firth et al.
patent: 4221196 (1980-09-01), Castarede
patent: 4370788 (1983-02-01), Baker
patent: 4700444 (1987-10-01), Yamagata

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