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:
Dec. 09, 1986
Filed:
Feb. 06, 1984
Josef Morell, Vienna, AT;
Harald Schmidt, Vienna, AT;
Steyr-Daimler-Puch AG, Vienna, AT;
Abstract
In a combination which includes a fuel injection unit and a cylinder of a diesel engine provided with a cover, and formed with a fuel bore communicating with a suction chamber, a piston is reciprocally moving within the cylinder, and is provided with a slanted front and rear control edge for regulating the quantity of fuel. The cylinder and piston define piston- and cylinder-surfaces separated from each other by a very small clearance, and are movable relative to each other; an injection nozzle includes a spring-loaded needle, a common casing houses the piston and the cylinder, a securing flange is disposed between the fuel bore and an end of the cylinder facing the cover, a tensioning device stresses the securing flange against the cover, and the piston, during its stroke, passes over the fuel bore. The improvement includes a cylindrically offset recess formed within a region of the securing flange on the cylinder surface, and the front control edge of the piston is formed with a first step-like recess with respect to the piston-surface. Consequently any undesired pressure peaks are avoided within the cylinder, when the piston passes over the fuel bore, while the clearance is substantially maintained between the piston surface and the cylinder surface during the stroke of the piston.