Distributor-type fuel injection pump

Claim 1

A distributor-type fuel injection pump comprising: (a) a pump body including a rear portion and a head portion remote from said rear portion, said rear portion having a first bore and said head portion having a second bore extending in alignment with said first bore; (b) a drive shaft rotatably mounted in said first bore via at least two bearings; (c) a feed pump disposed in said pump body adjacent to said rear portion and connected in driven relation to said drive shaft, there being defined between said feed pump and said head portion a cam chamber; (d) a plunger slidably mounted in said second bore and defining between said second bore a pump working chamber; (e) a cam disposed in said cam chamber and connecting said drive shaft with said plunger so as to cause the latter to take rotational and reciprocating motions simultaneously, in unision with the rotation of said drive shaft; (f) a magnetic valve disposed on said head portion for opening and closing a fuel passage communicating with said pump working chamber; (g) a pair of oil seals mounted around said drive shaft and disposed on opposite sides of said feed pump; (h) said rear portion further having a first passageway communicating with said first bore between said two bearings for introducing a lubrication oil into a space defined between said first bore, said drive shaft and said bearings; (i) said drive shaft having at least one second oil passageway extending diametrically therethrough and opening at opposite ends to one of said bearings, and a third oil passageway extending axially therein and communicating said second oil passageway with said cam chamber; and (j) a bypass passage bypassing said cam chamber ans communicating a discharge side of said feed pump with an inlet side of said fuel passage of said magnetic valve.