Fuel injection pump with improved shaft seal system

摘要

The invention provides a fuel injection pump comprising a casing (2); a drive shaft (3) rotatably mounted in the casing (2) and extending from a drive receiving end (4) which is located outside of the casing (2) to a point inside the casing (2); and first and second spaced apart seals (10,11) each for preventing the flow of fluid between the casing (2) and the drive shaft (3) at the location of the seal. A chamber (12) is formed between the drive shaft (3) and the casing (2), the chamber (12) being bounded at opposite ends thereof by the seals (10,11), and a vent passage (16) extends from the chamber (12) to a point on the surface of the casing (2) to vent the chamber (12). The vent passage (16) includes a portion defined by the clearance space between a screw threaded opening (15) and a screw (6) threadedly engaged with the opening (15). The screw (6) is preferably a screw which secures the casing to the engine supplied by the pump. The vent prevents fuel escaping, in the event of seal failure, from the interior of an injection pump to the interior of an engine with which the injection pump is associated but does not require any additional components. <IMAGE>