Patent ID: 6107615
Filing Date: 2000-08-22
Classification: H05B

Abstract:
A tray driving apparatus of a microwave oven, comprising:a driving source for rotating a tray disposed in a cooking chamber of said microwave oven;a driving shaft rotated by the driving source;a driven shaft connected to the tray and rotated together with the tray; andspeed changing means for changing the rotational speed of the tray by changing the ratio of the rotational speed transmitted from the driving shaft to the driven shaft;said speed changing means including:a driving gear unit having a plurality of driving gears, and mounted to the driving shaft; anda driven gear unit having a plurality of driven gears corresponding to respective driving gears of the driving, ear unit, and mounted to the driven shaft;wherein gears of any one of the driving rear unit and the driven gear unit are portion gears which are gears having gear teeth on respective portions of outer peripheries thereof, so that, upon a rotation of the driving shaft, each portion gear of any one of the driving gear unit and the driven gear unit are alternately meshed with a corresponding gear of the other one of the driving gear unit and the driven gear unit, to thereby change the rotational speed of the tray.