Internal-combustion engines – Charge forming device – With fuel pump
Reexamination Certificate
2000-05-03
2001-11-27
Yuen, Henry C. (Department: 3747)
Internal-combustion engines
Charge forming device
With fuel pump
C123S508000
Reexamination Certificate
active
06321724
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fuel injected engine having unit pumps and injection nozzles that are integrated with one another as a subassembly enabling the integrated unit pump and injection nozzles to be leak tested and calibrated prior to installation of the integrated pump and nozzle on the engine block and cylinder head.
2. Description of the Related Art
Currently, camshaft followers, unit pumps, injection lines and injection nozzles are installed in engines as individual components. Part variability results in significant variation in fuel output. Injection timing is set by measuring the block and selecting shims to adjust the pump mounting. Fuel leaks will occur if the injection line connections are faulty or not tightened properly.
Only after assembly into an engine are these components coupled with one another, thereby enabling leak testing and calibration of the quantity of fuel delivered by the pump and nozzle. If leaks are present, or if the fuel output is not within the desired specification, significant disassembly of the engine is needed to access the pump or nozzle for correction.
SUMMARY OF THE INVENTION
The present invention overcomes the above disadvantages by assembling the cam follower, the unit pump, the injection line and the injection nozzle together as an integrated unit pump injector before installation of any of these components into the engine block and cylinder head. The integrated assembly can be internally shimmed to give the correct injection timing and tested for fuel output and leaks. Any assemblies with leaks or fuel output outside the specified range would be disassembled and corrected. The integrated unit pump injector is then installed in the engine by simultaneously inserting both the injection nozzle and the unit pump into the cylinder head and block respectively. The simultaneous installation of the injection nozzle and pump as an integrated unit necessitates that the injection nozzle bore in the cylinder head and the pump bore in the block be parallel with one another. This is not the case with many engine designs.
By having an pre-assembled integrated unit pump injector, the entire assembly can be installed in the engine without subsequent adjustment or alteration. This reduces the engine assembly time and cost, reduces the engine output variability and reduces the likelihood of leaks. A further advantage is a shorter feedback time to the manufacturer of the pumps and injection nozzles of any manufacturing defects. This is possible by having the pump and nozzle manufacturer test the integrated assembly before shipment to an engine manufacturer rather than waiting until the components are assembled into an engine, the entire engine tested and defects in the pumps or nozzles reported to the pump and nozzle manufacturer.
A unit pump is associated with each cylinder of an engine.
REFERENCES:
patent: 1991586 (1935-02-01), Vincent
patent: 5390642 (1995-02-01), Thoma
patent: 5419298 (1995-05-01), Nolte et al.
patent: 5692477 (1997-12-01), Berger et al.
patent: 6026786 (2000-02-01), Groff et al.
Deere & Company
Gimie Mahmoud
Yuen Henry C.
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