Internal-combustion engines – Cooling – With jacketed head and/or cylinder
Reexamination Certificate
2000-02-16
2001-08-28
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Cooling
With jacketed head and/or cylinder
C123S04182R
Reexamination Certificate
active
06279516
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cylinder head for an engine and in particular to a cylinder head having a two-plane water jacket in which a lower chamber at one plane through the head cools the fire deck of each cylinder and a cross-flow passage spaced above the lower chambers in a second plane through the head directs coolant to an outlet. Less variability in fire deck temperature results from separating the lower chambers of each cylinder from one another.
2. Description of the Related Art
Typical heavy-duty diesel engine design relies on water jacket cooling that produces inconsistent cooling with higher temperatures at one end of the cylinder head fire deck than at the other. This results from a water jacket in which coolant from the cylinder head fire deck furthest from the coolant outlet flows through the cylinder head past the fire decks of the remaining cylinders as the coolant travels toward the coolant outlet. The fire deck of the cylinder nearest the coolant outlet is hotter than the fire deck of the cylinder furthest from the coolant outlet.
SUMMARY OF THE INVENTION
The present invention overcomes the inconsistent cooling of prior designs by providing a water jacket with two “planes,” or levels, of cooling in the cylinder head cooling circuit. The lower, directed cooling plane allows the coolant flowing into the cylinder head from the cylinder block to cool the fire deck of only one cylinder. The coolant flows upward from the directed cooling plane to an upper transport plane containing a cross-flow passage that directs the coolant to a coolant outlet without the coolant interacting with the direct cooling of the fire deck area of any other cylinders.
An upward flow channel is provided between the directed cooling plane and the upper transport plane. Preferably, this is an annular channel surrounding the injector nozzle sleeve where access to the bore surface from outside the head is provided so that the surface of the bore can be machined. Since the bore surface in the head and the injector nozzle sleeve surface are machined, the size of the channel is controlled by machine tolerances rather than by casting tolerances. This results in very little flow variation from one cylinder to the other, producing even cooling among the cylinders.
REFERENCES:
patent: 4083333 (1978-04-01), Rudert et al.
patent: 4214560 (1980-07-01), Nikly
patent: 4291650 (1981-09-01), Formia et al.
patent: 4455973 (1984-06-01), Stadler et al.
patent: 5682850 (1997-11-01), Matayoshi
patent: 5983844 (1999-11-01), Hauder
Haugen David James
Sandoval Fernando
Argenbright Tony M.
Deere & Company
Harris Katrina B.
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