The utility model discloses an oil level alarm mechanism of an
oil tank, which comprises a shell, a floating ball and a floating ball rod, the floating ball is arranged at the
tail end of the floating ball rod, a fixing frame and a
resistor disc support are arranged in the shell, the fixing frame is connected with the
resistor disc support in a buckling mode, a
resistor disc is arranged on the resistor disc support, and a sensor is further arranged on the resistor disc support. The sensor is matched with the resistor disc support in a concave-convex inserting mode through the sensor inserting piece and electrically connected with the resistor disc, a rotating seat is arranged on the shell, the front end of the floating ball rod is bent and connected to the rotating seat, a
rocker arm is further arranged on the rotating seat, and the end of the
rocker arm is in
sliding contact with the resistor disc. A
copper wire is arranged between the resistor disc and the sensor insert, one end of the
copper wire is soldered with the resistor disc, and the other end of the
copper wire is soldered with the sensor insert. The cover plate is ensured not to easily
cut off the sensor
insertion piece and the resistor disc in the
ultrasonic welding process, the technical effect of reasonable and reliable structure is realized, and the damage to the circuit in the
ultrasonic welding process is avoided.