Differential timing altering mechanism for fuel injectors

Claim 1

A power plant comprising: an internal combustion engine having a rotary output; a fuel injection pump having a rotary input adapted to be driven by said rotary output in timed relation thereto; means interconnecting said input and output comprising first and second bevel gears mounted, in spaced relation, for rotation about a common axis, the facing sides of said bevel gears having facing teeth in aligned relationship, one of said bevel gears being connected to said input and the other of said bevel gears being connected to said output, at least one pinion gear disposed in the space between said bevel gears and having teeth in engagement with the teeth of both said bevel gears, a carrier disposed between said bevel gears and mounted for rotation about said common axis, said carrier further journalling said pinion gear for rotation about an axis between said bevel gears and extending generally radially of said common axis, and selectively operable means connected to said carrier for bidirectionally moving the same to shift said third gear to selectively alter the phasing between said engine and said fuel pump; and said selectively operable means including a shaft mounted for rotation about a fixed axis spaced from, but generally parallel to said common axis, an eccentric mounted on said shaft, a pair of spaced surfaces on said carrier partially surrounding said eccentric, and a motor affixed to said shaft to rotate the same.