Injection pump
OwnerAllen F. Chapman, Peter Honnefinventors
Life of this patent
Estimating the term…
Abstract
A fuel injection pump includes a pumping section that is segregated from the drive mechanism to permit independent lubrication of the latter, thereby avoiding any need for reliance upon the fuel supplied for that purpose. Generally, the unit will have two pumping stages, one utilizing a rotating vane arrangement and the second comprising reciprocating pistons, and it may include novel means for adjusting timing and speed, which means may automatically be controlled in response to fuel pressure.
Claims16
A two-stage fuel injection pump assembly comprising:
- a. a body;
- b. a pump block mounted within said body and defining to one side thereof a drive mechanism section therewithin, said block having a pump chamber disposed to the opposite side thereof, and a plurality of piston cylinders extending therethrough and disposed thereabout on axes that are generally parallel to a central axis of said block;
- c. a corresponding plurality of injection pistons slidably mounted for reciprocal movement within said cylinders;
- d. sealing means for segregating said pump chamber and said drive mechanism section against the passage of liquid therebetween;
- e. a rotary pump member seated within said pump chamber of said block and providing therewith a pumping section;
- f. driven means within said drive mechanism section operatively connected for reciprocation of said pistons and rotation of said pump member;
- g. distributor means disposed to said opposite side of said pump block and adapted to cooperate therewith to distribute fuel to said pumping section, from said pumping section to said cylinders, and from said cylinders outwardly of said pump assembly, whereby said assembly is operable to receive and distribute fuel through said pumping section, and said drive mechanism section thereof can be lubricated independently of said pumping section and of the fuel passing therethrough.
In a fuel injection pump assembly including a body, a pump block mounted within said body and having a plurality of piston cylinders extending therethrough, a corresponding plurality of injection pistons slidably mounted for reciprocal movement within said cylinders, and driven means operatively connected for reciprocation of said pistons and comprising a rotary cam member having at least one cam element for periodically lifting said pistons, the improvement comprising:
- injection timing means operatively interposed between said driven means and said pistons, said timing means comprising an angularly adjustable plate disposed to one side of said pump body, and a plurality of lifters corresponding to said pistons and carried by said plate, one of said lifters being aligned with each of said pistons and having one end in contact therewith and the opposite end disposed for contact by said cam element of said rotary cam member, said one end of said lifters being enlarged relative to the corresponding end of said pistons to enable contact therebetween throughout a range of angularly adjusted positions of said plate, said timing means being adjustable to alter the effective angle of rotation at which said cam member is effective to operate said pistons, whereby the timing of fuel injection can be adjusted in accordance with the speed of a prime motor fueled by said pump assembly and driving said driven means thereof.
Dependencies are inferred from the claim text.