Low engine oil sensing switch

Details Low engine oil sensing switch Low engine oil sensing switch

1985-04-01

1986-04-29

Cross, E. Rollins

Internal-combustion engines

Lubricators

Crankcase, pressure control

123198DC, 184108, 73116, F01M 100

Patent

active

045849773

ABSTRACT:
A pneumatic switch (25) responsive to the vacuum in a closed crankcase (20) of a reciprocating piston engine (15) for indicating when there is less than a predetermined quantity of oil (21) in the crankcase. The switch includes a housing (30) defining a cylinder (35), a closed end (48) and an open end (74). A piston (36) reciprocates and rotates in the cylinder through a path determined by a cam (51) and a follower (52). Crankcase vacuum is applied to a chamber (47) between the piston and the closed housing end to move the piston against a calibrated spring (50). An electric switch (70, 71 and 76) indicates when the piston is in the portion of its path of motion when the engine is operating and there is less than the predetermined quantity of oil in the crankcase.

REFERENCES:
patent: 2529775 (1950-11-01), Maddox
patent: 2600810 (1952-06-01), Lucas
patent: 3366100 (1968-01-01), Sapp
patent: 3487183 (1968-12-01), Schulman
patent: 4203408 (1980-05-01), Yamaguchi et al.
patent: 4429670 (1984-02-01), Ulanet

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