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:
Nov. 04, 2008
Filed:
Nov. 27, 2006
Scott F. Shafer, Morton, IL (US);
Timur Trubnikov, Peoria, IL (US);
William John Love V, Dunlap, IL (US);
Heather Rebholz, Metamora, IL (US);
Jianhua Zhang, Dunlap, IL (US);
Scott F. Shafer, Morton, IL (US);
Timur Trubnikov, Peoria, IL (US);
William John Love V, Dunlap, IL (US);
Heather Rebholz, Metamora, IL (US);
Jianhua Zhang, Dunlap, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
A high volume high pressure common rail pump for a fuel system includes pairs of pump head assemblies in phase with each other but oriented in opposition to one another about a rotating cam shaft. Pump pistons in the pump head assemblies simultaneously undergo pumping strokes via a shared two lobe cam of the rotating cam shaft. The pump may include two pairs of pump head assemblies, and each head assembly may include two pump pistons. The cam shaft includes two cams sufficiently out of phase with one another that the cam shaft always has a positive torque even when the cam lobes are symmetrical. In addition, because the pumping is done simultaneously on opposite sides of the cam shaft, the forces on the cam shaft are balanced and its support bearings experience less wear and tear.