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. 29, 1976
Filed:
Dec. 09, 1974
Raymond Tissot, Bron, FR;
Sigma Diesel, Venissieux, FR;
Abstract
A fuel injection pump for an internal combustion engine has a pump assembly comprising a piston and cylinder and a structure defining a delivery passage through which fuel is delivered, during an active portion of a delivery stroke of the piston, from the cylinder to a linking passage connected to an injector. The structure also defines a return flow passage for the fuel between the linking passage and the cylinder. A normally closed delivery valve positioned in the delivery passage in alignment with the cylinder is responsive to pressure in the delivery passage to open during the active portion of the delivery stroke of the piston to allow fuel to be delivered to the linking passage. A normally closed return flow valve positioned in the return flow passage in alignment with the cylinder is responsive to the exceeding of a given pressure difference between the linking passage and the cylinder to open to allow fuel to flow back from the linking passage towards the cylinder, the return flow valve including a permanently open axial passage forming part of the delivery passage. A third valve is disposed in the delivery passage upstream of the return flow valve and is operative to open and close in the same sense as the delivery valve.