Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-12-17
2001-10-09
Dolinar, Andrew M. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C137S625690, C239S095000
Reexamination Certificate
active
06298826
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to control valves, and more particularly to use of center feed control valves in hydraulically actuated devices, such as fuel injectors.
BACKGROUND ART
A number of hydraulically actuated fuel injectors have been developed in recent years. While these injectors have performed well, engineers are always looking for ways to improve upon their design. For instance, because it is desirable to have an abrupt end to injection events with a lessened possibility of secondary injections, methods to more quickly relieve internal pressure after an injection event are often being sought. Additionally, a reduction in the overall size of the hydraulically actuated fuel injector is desirable to allow for incorporation of hydraulically actuated fuel injectors in ever smaller engine designs. Finally, it is almost always desirable to reduce the number of components in a hydraulically actuated fuel injector.
The present invention is directed to overcoming one or more of the problems set forth above.
SUMMARY OF THE INVENTION
A control valve comprises a valve body that defines a high pressure passage, a low pressure passage and a flow passage. A valve member is positioned in the valve body, has an end, and defines an internal passage that opens through the end. The valve member also defines a closing hydraulic surface that is exposed to fluid pressure in the flow passage. The valve member is movable between a first position at which the high pressure passage is open to the flow passage via the internal passage and a second position at which the low pressure passage is open to the flow passage. The closing hydraulic surface is oriented such that pressure applied to the closing hydraulic surface produces a force on the valve member in a direction toward the second position.
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Castro Arnold
Caterpillar Inc.
Dolinar Andrew M.
Liell & McNeil
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