Fuel injection regulating valve
AssigneeJohn Deere Technologies International, Inc.
InventorAndrew E. Meyer
Life of this patent
Estimating the term…
Abstract
A fuel injection control valve has a housing with a high pressure fuel inlet, a fuel outlet and a spill passage. A spool is rotatably and slidably received in the housing. The spool has peripheral delivery and spill control recesses which control communication of fuel to the outlet and through the spill passage as the spool rotates. The width and depth of the recesses may be adjusted to achieve desired timing and flow rate control. The spool is threadably connected to a rotating drive shaft. The spool is movable axially to adjust the amount of fuel delivered for each spool rotation and can be rotated relative to the engine drive system to adjust injection timing.
Claims20
A fuel injection control valve for an engine, comprising:
- a housing having a valve bore therein, an inlet port for communicating the bore with a source of pressurized fuel, an outlet port for communicating the bore with an engine fuel injector, a spill passage communicating the bore with the outlet, and a spill port for communicating the valve bore with a regulated source of spill fuel pressure;
- a spool rotatably and slidably received in the valve bore, the spool having an annular groove communicated with the outlet port, a delivery recess on a surface of the spool, the delivery recess being communicated with the groove, a spill recess on the surface of the spool spaced apart from the delivery recess;
- means for rotating the spool, the spool having a first set of rotary positions wherein communication between the inlet port and the delivery recess is blocked and wherein the spill recess communicates the spill passage to the spill port, and the spool having a second set of rotary positions wherein the inlet port is communicated with the outlet port via the delivery recess and the groove and wherein communication between the spill port and the spill passage is blocked;
- and
- means for moving the spool axially to adjust the amount of fuel communicated from the inlet port to the delivery recess and, from the spill passage to the spill port for each rotation of the spool.
A fuel delivery control valve comprising:
- a valve housing having a high pressure fuel inlet, a fuel outlet, a spill outlet and a spill passage for communicating fuel from the fuel outlet to the spill outlet;
- a valve member slidably and rotatably mounted in the housing, the valve member comprising means for controlling communication between the inlet and the outlet and for controlling communication of fuel through the spill passage as a function of rotation and axial movement of the valve member;
- a rotatable input shaft extending through the housing;
- means for coupling the input shaft to one end of the valve member so that the valve member is axially movable with respect to the input shaft and so that the valve member is rotatable with and with respect to the input shaft;
- a slidable input rod extending through the housing;
- and
- means for coupling the input rod to another end of the valve member so that movement of the rod causes only axial movement of the valve member.
Dependencies are inferred from the claim text.