Internal-combustion engines – Cooling – With jacketed head and/or cylinder
Patent
1981-04-07
1984-04-03
Feinberg, Craig R.
Internal-combustion engines
Cooling
With jacketed head and/or cylinder
123 4142, 123 4179, F02F 116
Patent
active
044401183
ABSTRACT:
An oil cooled system for an internal combustion engine (2 and 2') includes a cylinder liner (22 and 22') shaped to form an annular oil flow passage (36 and 36') by an inner flow control surface (52 and 52') and outer flow control surface (56 and 56') through which engine lubrication oil flows in a very thin film under laminar flow conditions to produce a very large convective heat transfer coefficient of 300-400 BTU's per hour-feet squared-degree Fahrenheit. To insure laminar flow conditions, the radial thickness of the annular flow passage (36 and 36') is held to less than 0.016 inches and is preferably in the range of 0.008 to 0.010 inches. The disclosed liner (22 and 22') is very accurately positioned within a cylinder bore (8) of the engine block (4) by liner stop means (68 and 68') for retaining the liner in a fixed axial position within the cylinder bore ( 8) and by inner and outer radial locating means (106, 106', 101 and 101') positioned, respectively, inwardly and outwardly of the inner flow control surface (52 and 52'). Annular oil supply passage (30 and 30') and oil collecting passages (66 and 66') are also formed to supply and collect, respectively, the cooling oil to cause the oil to flow within the flow passage (36 and 36') inwardly from the outermost portion of the liner (22) toward the crankshaft (6) for no more than about 40 percent of the total axial length of the liner (22). In one embodiment (FIGS. 1 and 2), the liner stop means (68) is adjacent the inner locating means (106). In a second embodiment, the liner stop means (68') is positioned adjacent the outer locating means (101').
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Cusick Steven M.
Stang John H.
Cummins Engine Company, Inc.
Feinberg Craig R.
Wolfe W. R.
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