STRUCTURE OF INTAKE AIR TEMPERATURE SENSOR AND CONTROL COMPONENT FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To prevent a short circuit between electrodes, electric corrosion and a characteristic change by forming a water-repellent film made of an insulating material on the surface of an intake air temperature detecting element. SOLUTION: Lead wires 3 are connected to both metal electrodes 2 having thermistor chips 1, and the thermistor chips 1 are molded with a resin into a spherical shape to form a thermistor. Thermistor support terminals 5 insert- molded to the lead wires 3 and an intake air temperature sensor main body 4 are connected by welding or soldering. The metal surface of the intake air temperature sensor main body 4 is coated with a fluorine-containing finishing agent with a high water-repelling effect. Waterdrops stuck to the surface are dropped by the water-repelling effect when the grains are enlarged, and no short circuit occurs between the lead wires 3 and terminals 5. Electric corrosion and a characteristic change can be prevented as a result, and reliability and measurement precision can be improved.