Oil drain passage structure of cylinder block and core...

Details Oil drain passage structure of cylinder block and core... Oil drain passage structure of cylinder block and core...

2007-06-05

2007-06-05

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

C123S1960CP

Reexamination Certificate

active

11299375

ABSTRACT:
The present invention provides an apparatus for achieving precise manufacturing of drain passages such as those used for oil return and blow-by gas discharge in a cylinder block. Grid-like oil drain passage and corresponding core structures are disclosed herein; the oil drain passage structure comprises a plurality of vertical passages that are arranged longitudinally with respect to the cylinder block, wherein the vertical passages are interconnected by a connecting passage that runs longitudinally through the central portions of the vertical passages.

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