Aluminum alloy piston and piston-ring assembly treated to suppre

Details Aluminum alloy piston and piston-ring assembly treated to suppre Aluminum alloy piston and piston-ring assembly treated to suppre

1989-01-23

1990-02-13

Wolfe, Willis R.

Internal-combustion engines

Particular piston and enclosing cylinder construction

Cylinder detail

92222, 277224, F02F 500

Patent

active

048997021

ABSTRACT:
A piston and piston-ring assembly includes a piston and piston-rings located in piston-ring grooves formed in the piston. Such a kind of surface hardening treatment as is accompanied by an increase in surface roughness, such as alumite treatment, is applied to at least a lower groove surface of a top piston-ring groove. On the other hand, a resin with an excellent adhesive property is coated on a portion of a surface of the piston-ring opposing the hardened surface of the piston-ring groove. The heat resistive property of the assembly is improved by the surface hardening treatment without being accompanied by an increase in blowby gas amount and oil consumption because resin removed from the piston ring fills the valleys of the rugged hardened surface of the piston-ring groove.

REFERENCES:
patent: 4212477 (1980-07-01), Ludwig
patent: 4360956 (1982-11-01), Hiller
patent: 4643079 (1987-02-01), Brann et al.
patent: 4762330 (1988-08-01), Lonne et al.

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