Piston and piston rings set
OwnerRobert Geffroy, Christophe Geffroyinventors
Life of this patent
Estimating the term…
Abstract
New assembly of cylinder, lightweight piston and piston rings for engines and compressors comprising in a cylinder a reduced weight piston provided with a new simpler piston rings set of a high efficiency producing a very small tension against the cylinder and lighter than the piston rings set known heretofore and wherein each of the purposes ascribed to the individual piston rings of the set is entirely attained by each piston ring of this assembly.
Claims33
An assembly comprising a cylinder, for internal combustion engine or compressor, extending between a compression head and a crankcase, a piston, and piston rings set reciprocable within said cylinder characterized by an improved combination of compression ring and oil control ring means for reducing friction, blow-by, and oil climbing, said means comprising:
- compression ring means in a piston groove coaxial with the cylinder adjacent the compression head end of said piston for minimizing blow-by from said compression head to said crankcase, and oil control ring means in a piston groove adjacent said compression ring means on the crankcase side constructed with acute conical elastic circular outer edge skirt means projecting uniformly from its piston groove for differentially scraping oil from the cylinder wall during the strokes of the piston toward said crankcase, and for bypassing oil on the cylinder wall by Kingsbury effect during strokes of the piston away from said crankcase, said skirt means comprising a plurality of separated metal blades projecting from an integral connecting portion of said oil control ring means, the composite free state circumference of said blades being greater than their operating circumference thereby providing said outward spring bias upon assembly.
An assembly comprising a cylinder for internal combustion engine or compressor, a piston and piston ring set, characterized by improved means for reducing friction and oil climbing, the means used comprising:
- an oil ring means 13, 113, 123, 133, 143, 2113, 2213 for scraping oil from the cylinder wall during the downward strokes of the piston, and bypassing oil on the cylinder wall during the upward strokes of the piston, said oil ring means being made of one piece spring steel formed with a circular row of very thin elastic touching lateral blades 1117, 1217, 1317, 1417, 2117, 2217 connected to one another and to the piston by the common side of their row 1118, 1218, 1318, 1418, 2018, 2118, 2218 located on the side of the piston head, and said blades being applied against the cylinder 134, 144 by the edge of their row located on the side of the crankcase through the elastic force of each blade, their outer lateral faces making with the wall of the cylinder an acute conical angle .alpha. opening to the piston head, said blades forming together a closed elastic skirt sealed on the side of the piston head and opened to the crankcase;
- said piston comprising on its periphery, on the level of the blades of the oil ring 1317, 1417, an annular space 1326, 1426 for collecting scraped oil and means 1327, 1429, 1330, 1431 for the return thereof into the crankcase.
Dependencies are inferred from the claim text.