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. 13, 2021
Filed:
May. 15, 2018
Robert Bosch Gmbh, Stuttgart, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A pump unit for feeding fuel, in particular diesel fuel, to an internal-combustion engine; the pump unit comprising a head () inside which a cylinder () is formed along an axis; a pumping piston () housed inside the cylinder and comprising a head portion () inside the cylinder and an opposite foot portion () projecting outside the cylinder; wherein the piston is slidable inside the cylinder in a reciprocating manner between a first position and a second position where the foot projects from the cylinder by a greater or smaller amount respectively; and wherein the outer surface of the piston comprises a portion () with a surface finish so as to have less friction and a greater lubricant-retaining capacity than the remainder of the outer surface of the piston; the portion extending along the axis between the head of the piston and a first intermediate point () in the first position of the piston, the first intermediate point being inside the cylinder.