Engine oil pressure-sensitive switch

Abstract

The invention discloses an engine oil pressure sensitive switch, which belongs to the field of engine oil pressure detection. The switch includes: an oil flow passage communicated with the main oil passage of the engine, an inner cavity not connected with the oil flow passage, a static contact located in the inner cavity, and an oil pressure channel through the oil flow passage The movable contact is used to control the connection or separation of the static contact, the breathing channel connecting the inner cavity with the outside world, and the gas-permeable membrane covering the breathing channel. The present invention covers the breathing channel through a breathable film, and liquids such as muddy water from the outside cannot directly enter the inner cavity through the breathing channel, which solves the problem of false alarms between the dynamic and static contacts due to the conduction of water droplets, and also solves the problem of There was a problem with power failure due to corrosion of components caused by liquid entering the cavity.

Description

technical field [0001] The invention relates to the field of engine oil pressure detection, in particular to an oil pressure sensitive switch. Background technique [0002] With the continuous development of gasoline engine technology, especially the improvement of small high-speed direct-injection gasoline engine technology, the lubrication effect formed by engine oil in the engine is particularly important. Reduce the frictional resistance and make the operation more smooth, especially the connecting rod bearing pair and the main bearing pair must have proper oil pressure, which is also the premise to ensure the reliable operation of each friction pair, so it is necessary to detect the oil pressure of the main oil passage of the engine , when it is detected that the engine oil pressure is lower than the preset pressure value, the sound and light alarm system will be turned on. The detection of oil pressure is generally through the oil pressure switch sensor, which is usua...

AI Technical Summary

Problems solved by technology

[0006] Since the breathing channel of the current oil pressure sensitive switch is exposed, it is very easy to cause failure due to water ingress

For example, when the engine encounters a large area of ​​cold water splashing, the temperature drops, and the pressure in the inner cavity is lower than the atmospheric pressure. At this time, the inner cavity needs to compensate for air to achieve balance. It will enter the inner cavity along the breathing channel, and then the muddy water will adhere to the position of the dynamic and static contacts. Although the dynamic and static contacts are separated under the action of oil pressure, due to the conduction effect of water droplets between the dynamic and static contacts, The switch behaves as normally on, false alarm

When the liquid enters for a period of time, there is a certain amount of corrosion between the contact surfaces of springs, contacts and other parts, and the rust layer blocks the conduction of the circuit, and the switch will fail at this time

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