Rotating device, housing, and electronic device

A rotating device, comprising:

• at least one pair of rotation assemblies;
• and
• a gear assembly located between rotation assemblies of one pair of the at least one pair of rotation assemblies, wherein:
• each rotation assembly of the at least one pair of rotation assemblies comprises a support frame and a rotating rack rotatably connected to the support frame, the rotating rack being provided with a driving gear engaging with the gear assembly;
• the rotating racks of one pair of rotation assemblies are synchronously rotatable by rotating the rotating rack relative to a corresponding support frame;
• driving, by the rotation of the rotating rack, a corresponding driving gear to rotate;
• and further rotating, by the rotation of the corresponding driving gear, the gear assembly;
• and
• the rotating rack comprises a rotating piece and a connecting piece, wherein the connecting piece comprises a connecting plate, and a guide plate protruding from a surface of the connecting plate facing towards the support frame, and wherein the driving gear is an external gear provided on an end of the connecting plate.

An electronic device, comprising:

• a flexible screen;
• and
• a housing,
• wherein the flexible screen is arranged on the housing, the housing comprises a first frame body, a second frame body, and a rotating device disposed between the first frame body and the second frame body and configured to fold or unfold the first frame body and the second frame body,
• the rotating device comprising:
• at least one pair of rotation assemblies;
• and
• a gear assembly located between rotation assemblies of one pair of the at least one pair of rotation assemblies, wherein:
• each rotation assembly of the at least one pair of rotation assemblies comprises a support frame and a rotating rack;
• the rotating rack comprises a rotating piece rotatably connected to the support frame, and a connecting piece provided with a driving gear thereon;
• the rotating racks of one pair of rotation assemblies are synchronously rotatable by driving the driving gear with a rotation of the rotating rack relative to a corresponding support frame;
• the connecting piece comprises a connecting plate, and a guide plate protruding from a surface of the connecting plate facing towards the support frame;
• the driving gear is provided on an end, having an arc-shaped cross-section, of the connecting plate;
• and
• the driving gear comprises a plurality of teeth, each of the plurality of teeth extending along a longitudinal direction of the connecting plate, and the plurality of teeth being distributed along a periphery of the end, having the arc-shaped cross-section, of the connecting plate.