Hydraulic, automatically adjustable timing device for fuel injection

Claim 1

A hydraulic, automatically adjustable timing device for fuel injection in which a rotor having vanes and a casing having radial members are coaxially connected to a drive shaft and a driven shaft respectively, each vane and each radial member forming an operating chamber having a passage to permit fluid in and out; the bore of said drive shaft having disposed therein a pilot valve rotatable by centrifugal force of flyweights and having separate fluid chambers provided with fluid passages respectively, said pilot valve controlling the opening and closing of the fluid chambers, resulting in rotational transmission and relative movement between the drive shaft and the driven shaft through fluid present in the chambers; the pilot valve having a flat shaft which separates the two fluid chambers and forms lands to control communication of the flow passage with the fluid chambers, said lands being parallel to the axis of said pilot valve, said chambers being in communication with the atmospheric pressure side and the fluid pressure source side respectively.