The invention discloses a rotary electromagnetic actuating mechanism and a car lamp upper and lower
beam switching device thereof, and relates to an illuminating device or functional characteristics or parts of a
system of the illuminating device. The rotary electromagnetic actuating mechanism comprises a shell, a rotor, a
stator, a rotary shaft and an end cover;
stator windings are arranged on the
stator, and the stator and the stator windings are fixedly mounted in the shell to form a pair of arc-shaped stator
magnetic poles capable of being electrified to be excited; the rotor is an arc-shaped permanent
magnet, is fixed onto the rotary shaft, is placed in
magnetic field space of the arc-shaped stator
magnetic poles and is matched with the arc-shaped stator
magnetic poles, so that a closed
magnetic circuit with air gaps is formed; and two ends of the rotary shaft are respectively connected with two oscillating bars radially extending along the rotary shaft. A shading plate of the car lamp upper and lower
beam switching device is fixedly connected onto the oscillating bars at the two ends of the rotary shaft, an oscillating angle of the shading plate is identical to a rotation angle of the rotor, the rotary electromagnetic actuating mechanism drives the shading plate to realize switching between upper beams and lower beams, collision
noise generated when electromagnets are sucked and released is avoided, and a comfortable driving environment is provided for users.