Internal-combustion engines – Cooling – Internal cooling of moving parts; e.g. – hollow valves,...
Reexamination Certificate
1999-08-20
2001-05-29
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Cooling
Internal cooling of moving parts; e.g., hollow valves,...
Reexamination Certificate
active
06237548
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to controlling the oil flow to an oil nozzle and is particularly applicable to a nozzle for directing a cooling stream of oil onto the underside of a reciprocating piston of an engine.
BACKGROUND OF THE INVENTION
It is known to cool the reciprocating piston of an engine by directing a stream of oil onto its underside. The nozzle used to direct the oil stream may be a so-called dowel nozzle, which is a carefully shaped and positioned tube fed from a dedicated oil gallery and aiming a jet of oil onto a target point on the piston. Alternatively, the nozzle may be in the form of a plastic nozzle inserted into a bore in the saddle of a main bearing and fed from an annular oil groove in the upper main bearing shell. These two types of nozzle are designed to operate with different oil flow rates and the nozzle fed from a dedicated oil gallery requires an oil pump of higher output.
If different variants of the same engine produced by a manufacturer are designed to operate with different types of oil nozzle, the spray pattern achieved by supplying oil to a plastic nozzle using a higher output pump intended for a dowel nozzle results in an oil plume angle that is so large that the oil achieves a negligible cooling effect.
Simply reducing the bore of the nozzle itself does not correct this problem but will probably increase the plume angle still further due to the higher dynamic pressure across the plastic nozzle.
Object of the Invention
The present invention therefore seeks to provide a simplified means of regulating the oil flow to a nozzle that will allow a nozzle designed for use with a low output oil pump to operate efficiently with a higher output oil pump.
SUMMARY OF THE INVENTION
In accordance with a first aspect of the present invention, there is provided an oil passage for supplying oil to a nozzle, comprising two communicating bores which are misaligned with one another such that the area of overlap between the bores at their intersection is smaller than the cross-section of each of the bores and serves as a flow regulating throttle along the oil passage.
In accordance with a second aspect of the present invention, there is provided an internal combustion engine having an oil nozzle for cooling a reciprocating piston of the engine by directing a stream of oil onto the underside of the piston and a passage for supplying oil to the nozzle, wherein the oil passage comprises two communicating bores which are misaligned with one another such that the area of overlap between the bores at their intersection is smaller than the cross-section of each of the bores and serves as a flow regulating throttle along the oil passage.
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patent: 1430575 A1 (1988-10-01), None
Cummins Engine Company Ltd.
Gron Gary M.
Harris Katrina B.
Wolfe Willis R.
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