Transfer pump for injection of fuel at high pressure

Abstract

A transfer pump for the injection of fuel under high pressure of the type comprising a piston (10) providing the hydraulic liquid to a deformable bellows (14), the deformations of said bellows (14) in a cylindrical chamber (20) filled with fuel giving rise to a high pressure pumping effect of said fuel; a cam (5) provided with lugs (6) carried by a drive shaft (1), is characterized in that the oil portion of the pump comprises: the portion of the drive shaft (1) bearing the cam (5); the cam (5) and its lugs (6); the roller (7) with its shaft (8) and its roller bearing (9) carried by a bearing member (12), by which roller the cam(5) bears on the piston (10); as well as the upper portion of said piston (10); such that all the mechanical drive portion and angle change are bathed in the oil of the oil portion.

Dependencies are inferred from the claim text.