Metering valve for fuel injection
AssigneeEaton Corporation
InventorRobert C. Merritt
Life of this patent
Estimating the term…
Abstract
Disclosed is a metering valve for a diesel engine fuel injection system. Two injection systems are shown which embody the valve. The valve includes a spool which is moved in one direction by a stepped cam and is moved in the other direction by a spring. The cam moves the spool at a velocity proportional to engine speed. The spring moves the spool at a velocity proportional to the spring force and independent of engine speed. A mechanical fuel distributor prevents fuel metering by the spool when the cam is moving the spool and allows fuel metering when the spring is moving the spool.
Claims18
A metering valve adapted for use in an injection system of the type including a source of pressurized fluid, a discharge nozzle, passage means for communicating the source with the nozzle, and means for periodically blocking and opening said passage means, said metering valve comprising:
- a valve housing having an inlet port and an outlet port adapted to be connected to said source and said nozzle, respectively, by said passage means;
- a valving member moveable between first and second positions in said housing and operative to block an interconnection of said ports when in said first and second positions, said valving member including metering means moveable with said valving member for interconnecting said ports when moving between said first and second positions;
- resilient means operative to move said valving member from said second position to said first position;
- and
- cam means driven in a timed relation with said periodic means and operative to move said valving member from said first position to said second position when the periodic means is blocking said passage and then abruptly allow said valving member to move to said first position in response to the force of said resilient means when the periodic means is opening said passage means.
In a fuel injection system of the type including a source of pressurized liquid fuel, a nozzle for delivering the fuel to a piston cylinder of an internal combustion engine, passage means for communicating the source with the nozzle, and means for periodically blocking and unblocking the passage means, wherein the improvement comprises:
- a valve housing having a fuel inlet port and a fuel outlet port, respectively, connected with said source and said nozzle;
- a valving member moveable between first and second positions in said housing;
- cam means operative to move said valving member from said first position to said second position in response to relative movement between said cam means and said valving member and when said periodic means is blocking said passage means;
- and
- means operative to move said valving member from said second position to said first position at speeds independent of said relative movement and when said periodic means is unblocking said passage means for effecting a fuel metering by said valving member to said nozzle at a rate independent of the speed of said relative movement.
A metering valve for an injection system of the type including a source of pressurized liquid fuel, a nozzle for delivering the fuel to a piston cylinder of an internal combustion engine, passage means for communicating the source with the nozzle, and means for periodically blocking and opening the passage means in a timed relation to the piston, said metering valve comprising:
- a valve housing having an inlet port and an outlet port connected to said source and nozzle, respectively, and a bore in communication with said ports;
- a valving member disposed in said bore for metering fuel from said inlet to said outlet when said valving member is moving between first and second positions in said bore and for preventing said metering when in said first and second positions;
- resilient means for moving said valving member from said second position to said first position;
- and
- cam means operative to move said valving member to said second position when said periodic means is blocking said passage means and then abruptly allow said resilient means to move said valving to said first position when said periodic means is opening said conduit.
Dependencies are inferred from the claim text.