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:
Jun. 26, 1990
Filed:
Jun. 20, 1989
Michael Groddeck, Meckenbeuren, DE;
Otto Reifenscheid, Friedrichshafen, DE;
Gerd-Michael Wolters, Immenstaad, DE;
MTU Friedrichshafen GmbH, Friedrichshafen, DE;
Abstract
A lubricating system is disclosed which includes a splash cooling of the pistons of an internal-combustion engine by spraying nozzles, the cooling jets of which are aimed at the interior surfaces of the pistons. In order to achieve, after the start of an internal-combustion engine, a rapid buildup of the lubricant pressure, the lubricant supply to the spraying nozzles is interrupted in this initial operating phase. Since, in the starting phase, the lubricating oil supply to the camshafts can be reduced considerably or can even be switched off completely without damaging the bearings, the spraying nozzles and the camshafts receive a common lubricating oil supply which can be controlled centrally by means of control valves. It is advantageous that already existing lubricant ducts may be used, and the spraying nozzles can be constructed in a simple manner without any integrated control valves. It is also advantageous that the spraying nozzles must no longer be arranged at the central main duct above the crankshaft, which is disadvantageous with respect to accessibility and space conditions, but in the area of the camshafts which, in the case of a V-Engine, may be arranged in an advantageous lateral crankcase area.