The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 1984
Filed:
Apr. 07, 1981
John H Stang, Columbus, IN (US);
Steven M Cusick, Pittsburgh, PA (US);
Cummins Engine Company, Inc., Columbus, IN (US);
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').