Cylinder head with inwardly projecting cup plug in casting sand extraction hole for speeding up coolant flow
Patent
·
OSTI ID:6096740
A cylinder head for an internal combustion engine is described having combustion chambers, the cylinder head comprising: (a) an inner wall serving to define roofs of combustion chambers of the internal combustion engine; (b) an outer wall spaced from the inner wall, the inner and outer walls defining a coolant plenum between the inner wall and the outer wall, with a coolant flow path being defined through the coolant plenum, and the outer wall having a casting sand extraction hole extending through the outer wall and opening to a region of the coolant plenum which has a cross-sectional area that is substantially larger than the cross-sectional area of the coolant flow path in a portion of the coolant plenum adjacent to the region; and (c) a cup plug fitted into the casting sand extraction hole so as to block the hole, and cup plug projecting inwards into the coolant flow plenum so far as to reach nearly to the inner wall but to leave a coolant flow passage between the plug and the inner wall, thereby substantially reducing the cross-sectional area of the region of the coolant plenum.
- Assignee:
- Toyota Jidosha Kabushiki Kaisha, Aichi
- Patent Number(s):
- US 4690104
- OSTI ID:
- 6096740
- Country of Publication:
- United States
- Language:
- English
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