A pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine has a pre-feed pump (3), which feeds the fuel to a high-pressure pump (2), is connected to a fuel storage chamber by means of an intake duct (49) and is provided with two gearings (40, 42) engaging with each other and made to rotate by an electric motor (37), a stator (38) of which is housed inside a containing chamber (48) formed in a pump body (32) of the pre-feed pump (3) and hydraulically connected to the intake duct (49).

A fuel pump includes: an electric motor; a pump stage drivable by the electric motor; and a fuel pump housing configured to accommodate the electric motor and the pump stage. The fuel pump housing has a first housing part configured to accommodate the electric motor and a second housing part configured to accommodate the pump stage. One or both of the first housing part and the second housing part are made of a conductive plastic adapted to dissipate static charges to a ground potential.

An electric gear pump comprising: a gerotor rotatable about an axis of rotation A; a support base for the gerotor; a cover which can be joined to the base; a feed duct and a delivery duct; electronic components of the control unit which are fastened on the outer surface of the cover; wherein the feed and delivery ducts are at least partly formed in the cover and comprise an axial section parallel to the axis A and a radial section parallel to the outer surface of the cover; wherein the outer surface of the cover comprises an inset portion; wherein at least a portion of the radial sections of the feed and delivery ducts is configured so as to project externally from the inset portion of the outer surface of the cover and form projecting support portions for the electronic components of the control unit.

A pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine has a pre-feed pump (3), which feeds the fuel to a high-pressure pump (2), is connected to a fuel storage chamber by means of an intake duct (49) and is provided with two gearings (40, 42) engaging with each other and made to rotate by an electric motor (37), a stator (38) of which is housed inside a containing chamber (48) formed in a pump body (32) of the pre-feed pump (3) and hydraulically connected to the intake duct (49).

A fuel pump includes: an electric motor; a pump stage drivable by the electric motor; and a fuel pump housing configured to accommodate the electric motor and the pump stage. The fuel pump housing has a first housing part configured to accommodate the electric motor and a second housing part configured to accommodate the pump stage. One or both of the first housing part and the second housing part are made of a conductive plastic adapted to dissipate static charges to a ground potential.

A fuel pump includes: an outer gear having a plurality of inner teeth; an inner gear having a plurality of outer teeth and eccentrically meshing with the outer gear; and a pump housing that defines a cylindrical gear housing chamber housing the outer gear and the inner gear to be rotatable. The outer gear and the inner gear rotate, while expanding and contracting a volume of a plurality of pump chambers formed between the outer gear and the inner gear, to sequentially draw fuel into and discharge from the pump chamber. An inner circumference part of the pump housing has a radially-inside corner part opposing a radially-outside corner part of an outer circumference part of the outer gear, and the pump housing has an annular groove formed in an annular shape all around the radially-inside corner part.

A gear pump for a gas turbine engine including a first gear having a plurality of gear teeth supported for rotation on a gear shaft relative to a second gear, wherein the gear teeth are formed from a steel base material and surfaces of the gear teeth are coated with a cavitation resistant coating material, and a journal bearing for carrying a gear shaft load through a fluid film pressure between a surface of the gear shaft and a surface of the journal bearing, wherein at least a portion of the journal bearing is formed from a cavitation resistant base material.

An electric gear pump comprising: a gerotor rotatable about an axis of rotation A; a support base for the gerotor; a cover which can be joined to the base; a feed duct and a delivery duct; electronic components of the control unit which are fastened on the outer surface of the cover; wherein the feed and delivery ducts are at least partly formed in the cover and comprise an axial section parallel to the axis A and a radial section parallel to the outer surface of the cover; wherein the outer surface of the cover comprises an inset portion; wherein at least a portion of the radial sections of the feed and delivery ducts is configured so as to project externally from the inset portion of the outer surface of the cover and form projecting support portions for the electronic components of the control unit.

Invention provides gear pump bearing block and method of manufacturing gear pump bearing block. Bearing block includes a bush formed of antifriction alloy, bush having cylindrical portion providing bore adapted to receive bearing shaft of gear of pump, and further having flange portion extending radially outwardly at end of cylindrical portion to provide thrust face adapted to slidingly engage with side surface of gear. Bearing block also has backing layer covering radially outer surface of cylindrical portion and rear face of flange portion, backing layer being formed of less dense alloy compared to antifriction alloy. Furthermore, there is an annular gallery embedded in flange portion such that gallery is spaced from surface of bore and from thrust face, gallery surrounding bore, with inlet to and outlet from annular gallery such that, in use, fluid flows from inlet, through annular gallery to provide cooling of thrust face, and then to outlet.

A pumping unit has a fuel storage tank (2), a piston pump (6) for feeding the fuel to an internal combustion engine (3); a gear pump (7) for feeding the fuel from the storage tank (2) to the piston pump (6), and a hydraulic circuit (46) which connects together the storage tank (2) and the internal combustion engine (3), extends through a pump body (8) of the piston pump (6) so as to lubricate an actuating shaft (36) of the piston pump (6) and has a collection branch (55) for collecting the fuel leaks resulting from the lubrication of said actuating shaft (36); the collection branch (55) being connected to an intake (37a) of the gear pump (7) so as to lubricate an actuating shaft (42) of the gear pump (7) with the fuel from said collection branch (55).