Automatic air vent device for fluid pump of internal combustion

Details Automatic air vent device for fluid pump of internal combustion Automatic air vent device for fluid pump of internal combustion

1987-02-17

1988-11-29

Freeh, William L.

Pumps

Expansible chamber type

Pumping member position controlled port

417502, 184 623, F04B 706, F01M 900

Patent

active

047878320

ABSTRACT:
Several embodiments of venting arrangements for the lubricant pump of a two-cycle, crankcase compression internal combustion engine for an outboard motor and having a positive lubricating system. In each embodiment, the lubricant pump is provided with a vent passage that extends from an upper portion of a chamber of the pump for venting air from it. In each embodiment, an arrangement is provided for permitting air flow from the fluid pump without returning to the fluid pump. In some embodiments, this means comprises a check valve and in another embodiment, it comprises a restricted orifice.

REFERENCES:
patent: 2118234 (1938-05-01), Rupp
patent: 2819678 (1958-01-01), Nordell et al.
patent: 3181473 (1965-05-01), Duron
patent: 3353492 (1967-11-01), Heinzelmann et al.
patent: 3630639 (1971-12-01), Duron
patent: 3936244 (1976-02-01), Drori
patent: 4053901 (1977-10-01), Shafuenstadt

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