Internal-combustion engines – Cooling – Internal cooling of moving parts; e.g. – hollow valves,...
Reexamination Certificate
1999-08-13
2001-10-09
Wolfe, Willis R. (Department: 3726)
Internal-combustion engines
Cooling
Internal cooling of moving parts; e.g., hollow valves,...
Reexamination Certificate
active
06298810
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to the mounting of a cooling nozzle on an engine block in order to direct a nozzle or spray of oil at the underside of a reciprocating piston.
BACKGROUND OF THE INVENTION
It is known to cool a piston of a heavy duty engine by directing a spray or stream of oil at its underside. For this purpose, a nozzle is secured to the engine block by means of a capscrew and communicates through the capscrew with an oil gallery in the engine block. Conventionally, the capscrew passing through a hole in the base or mounting collar of the nozzle serves as the means for correctly positioning and aligning the nozzle in the block but very accurate machining is required both in the drilling and in the tapping of the bore in the engine block on account of the precision with which it is essential to locate the oil nozzle. In this context, it should be noted that the clearance between the crankshaft, the connecting rod and the piston is typically 5 mm, but it can be as little as 3 mm.
OBJECT OF THE INVENTION
The present invention therefore seeks to provide a mounting of a piston cooling nozzle on the engine block that can reliably achieve accurate alignment positioning of the oil nozzle without resorting to expensive high precision machining and which also ensures that oil can enter the nozzle freely and without obstruction.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a method of mounting an oil nozzle on an engine block, the oil nozzle comprising an annular mounting collar having a cylindrical outer surface and an inner recess in flow communication with a tube projecting generally radially from the mounting collar, the method comprising drilling a bore in the engine block to intersect an oil gallery in the engine block, machining a cylindrical recess in the surface of the cylinder block surrounding the mouth of the bore for receiving and locating the mounting collar of the nozzle, tapping a thread in the bore, placing the mounting collar of the nozzle in the recess and inserting a capscrew through the collar into the threaded bore to retain the collar within the recess, the capscrew allowing oil to flow from the oil gallery in the block into the mounting collar and tube of the oil nozzle.
In accordance with a second aspect of the invention, there is provided an oil nozzle mounted on an engine block to direct oil from an engine oil gallery towards the underside of a reciprocating piston. The oil nozzle comprises an annular mounting collar having a cylindrical outer surface and a tube projecting generally radially from the mounting collar, the annular mounting collar having an interior hole in flow communication with the tube, the engine block is formed with a drilled and tapped screw threaded bore that is drilled into the surface of the engine block to intersect the oil gallery and with a cylindrical recess that is machined in the surface of the cylinder block surrounding the mouth of the bore to receive and locate the mounting collar of the nozzle. A capscrew extends through the collar into the threaded bore to retain the collar within the recess, the capscrew allowing oil to flow from the oil gallery in the block into the mounting collar of the oil nozzle.
REFERENCES:
patent: 4995346 (1991-02-01), Hudson, Jr.
patent: 5881684 (1999-03-01), Bontaz
patent: 5917418 (1999-06-01), Han
Antcliff Gary S.
Chimonides Nikos
Cummins Engine Company Ltd.
Gron Gary M.
Harris Katrina B.
Wolfe Willis R.
LandOfFree
Mounting a cooling nozzle on an engine block does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mounting a cooling nozzle on an engine block, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mounting a cooling nozzle on an engine block will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2571950