Sealing structure of cylinder head cover
This patent describes a structure for mounting a cylinder head cover on a cylinder head of an internal combustion engine. The cylinder head has plug holes for mounting ignition plugs therethrough, a plug tube fixedly inserted into each of the plug holes and protruding upward from the cylinder head, the cylinder head cover being mounted on the cylinder head via a sealing gasket arranged therealong. The mounting structure comprises: the cylinder head cover having plug mounting holes, each of which is formed in substantially reversed-conical surface having a diameter that becomes gradually smaller toward the lower portion thereof. The plug tube has a male thread portion at an upper end thereof protruding upward from the cylinder head cover through the plug mounting hole, a grommet having an annular sealing lip fitted to the upper end of the plug tube, and a fastening nut engaged with and fastened to a male thread portion of the plug tube to urge the grommet downward so that the sealing lip of the grommet is sealingly pressed into a gap between the reverse-conical surface of the cylinder head cover and an outer peripheral surface of the plug tube, so as to tightly seal away oil contained in the cylinder head cover.
- Assignee:
- Toyota Jidosha Kabushiki Kaisha, Aichi
- Patent Number(s):
- US 4727833
- OSTI ID:
- 5034934
- Resource Relation:
- Patent File Date: Filed date 12 Nov 1986
- Country of Publication:
- United States
- Language:
- English
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