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US 4,178,725 AGranted
Rotary engine housing manufacture
AssigneeCaterpillar Tractor Co.
InventorAlexander Goloff
Life of this patent
Estimating the term…
Abstract
A rotary engine housing having an improved inner surface structure for preventing scuffing and wear such as during break-in and heavy load operation of the engine. The housing is defined by a wall having an inner surface provided with a crosshatch topography. The cross-hatching lines are preferably arranged at a substantial angle to the line of intersection of a plane perpendicular to the axis of the piston chamber and the wall surface.
Claims9
The method of finishing a rotary internal combustion engine inner wall surface, comprising
- honing said wall surface to define a crosshatched topography wherein unfilled cross-hatching lines are provided at a substantial angle to the line of intersection of a transverse plane with said wall surface, said honing step being effected by a flexible cylindrical hone having rigid longitudinal reinforcing stays arranged in a coaxially annular array about the axis of the cylindrical hone whereby the hone is axially substantially rigid and circumferentially substantially flexible, said hone being rotated about said axis and concurrently oscillated parallel to said axis during the honing operation to provide a preselected substantially uniformly angled cross-hatching of the wall surface.
Dependencies are inferred from the claim text.