Patent ID: 6155107
Filing Date: 2000-12-05
Classification: F01M,G01F,Y10T

Abstract:
An engine oil level detector comprising:a casing having a first receiving chamber and a second receiving chamber;a top cover covered on said casing at one side, said top cover comprising a first air chamber, a second air chamber, and an air hole in communication between said first air chamber and said second air chamber;a diaphragm covered on said first air chamber and said second air chamber, said diaphragm comprising a first tubular coupling portion in communication with said first air chamber and a second tubular coupling portion in communication with said second air chamber;a suction tube having one end connected to the first air chamber of said casing and an opposite end inserted an engine oil tank in a vehicle engine;a test switchan electromagnetic valve mounted in the first receiving chamber inside said casing and controlled by said test switch, said electromagnetic valve comprising a reciprocating rod fastened to the first tubular coupling portion of said diaphragm;a solenoid switch mounted in the second receiving chamber inside said casing corresponding to the second tubular coupling portion of said diaphragm;a signal lamp controlled by said solenoid switch;a magnet fastened to the second tubular coupling portion of said diaphragm; anda bottom cover covered on said casing at one side opposite to said top cover to close said first receiving chamber and said second receiving chamber;wherein when the oil level in said engine oil tank surpasses said suction tube and said test switch is switched on, said reciprocating rod is attracted by said electromagnetic valve to pull said first tubular coupling portion of said diaphragm toward said electromagnetic valve, enabling air to be sucked from said second air chamber into said first air chamber and said magnet to be moved with said second tubular coupling portion of said diaphragm in direction reversed to said solenoid switch, thereby causing said solenoid switch to cut off said signal lamp; when the oil level in said engine oil tank drops below said suction tube and said test switch is switched on, said reciprocating rod is released, and said diaphragm returns to a balanced manner, thereby causing said magnet to be moved with said second tubular coupling portion in direction toward said solenoid switch, to turn off said solenoid switch and said signal lamp.