Sigma Diesel

Andre Vuaille

The hydraulic head especially for an 'in line' injection pump, comprises a cylinder forming a pump chamber, in which a pump piston moves, having at least one fuel supply orifice formed in its cylindrical wall. The hydraulic head has a deflector element situated axially at the level of this supply orifice to deflect a jet of fuel capable of emerging from said orifice. A delivery connector is connected to the cylinder, and is constituted by an elastic ring of cylindrical form. The ring is open and has two ends arranged to come into contact with one another, said ends being separable from one another.

Hydraulic heads for injection pumps and the injection pumps themselves

A device for regulating the delivery of a fuel injection pump of an internal combustion engine comprises a centrifugal governor coupled to a regulating member of the pump by a transmission lever so that the delivery of the pump is regulated in dependence upon engine speed. The transmission lever is pivotally connected at its ends to a control member of the governor and to the regulating member respectively, the lever being freely rotatably mounted intermediate its ends on a spindle eccentrically mounted on a pivot rotatably supported by a casing of the device. Actuating means responsive to a controlling fluid pressure is provided for rotating the pivot in order to adjust the regulating member in dependence upon the controlling fluid pressure. The actuating means comprises a differential piston received in a cylinder to define first and second permanently interconnected chambers, the first chamber of smaller cross-section being supplied with working fluid and the second chamber of greater cross-section communicating with a low pressure region via a variable throttle section defined between the differential piston and a pilot valve whose position is adjusted by a deformable unit sensitive to the controlling fluid pressure.

Device for regulating the delivery of a fuel injection pump of an

The hydraulic head comprises a cylinder forming a pump chamber and comprising at least one fuel supply orifice formed in its cylindrical wall. A pump piston is adapted to move in said cylinder, and a delivery connector is connected to the cylinder. This connector is provided externally with a shoulder adapted to constitute an axial stop for the hydraulic head, against a support surface of the pump casing comprising housings adapted to receive said hydraulic heads. The delivery connector, comprises, in addition, internally, a delivery valve, the end portion of the cylinder turned towards the delivery connector comprising, on its outer surface, fixing means adapted to cooperate with complementary fixing means provided on the inner surface of a housing of the delivery connector adapted to receive said end portion of the cylinder. Thus, in the fully assembled hydraulic head, said cylinder is directly suspended on the delivery connector.

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Lyon, France

Andre Vuaille