Hinge mechanism and electronic device

An electronic device comprising:

• a first housing;
• a second housing;
• a flexible display;
• a hinge mechanism comprising a first side and a second side opposite the first side, wherein the first housing is disposed on the first side, the second housing is disposed on the second side, and the first housing and the second housing are rotatably connected to the hinge mechanism for folding and unfolding the electronic device, wherein the flexible display is fastened to the first housing and the second housing, wherein the flexible display continuously covers the first housing, the second housing, and the hinge mechanism, and wherein the hinge mechanism comprises:
• a main shaft comprising a third side and a fourth side opposite the third side;
• a first swing arm disposed on the third side and rotatably connected to the main shaft;
• a second swing arm disposed on the fourth side and rotatably connected to the main shaft;
• a synchronization assembly located between the first swing arm and the second swing arm along an axial direction of the hinge mechanism, wherein the synchronization assembly comprises:
• a first gear assembly comprising:
• a first gear member comprising:
• a first gear comprising a first gear surface and a first end part, wherein a first axis of the first gear is parallel to and does not coincide with a second axis along which the first swing arm rotates around the main shaft;
• and
• a first connection part located on the first end part and facing the first swing arm;
• and
• a first connecting rod slidably connected to the first connection part and rotatably connected to the first swing arm;
• and
• a second gear assembly comprising:
• a second gear member comprising:
• a second gear comprising a second gear surface and second end part, wherein the second gear surface is engaged with the first gear surface, and wherein a third axis of the second gear is parallel to and does not coincide with a fourth axis along which the second swing arm rotates around the main shaft;
• and
• a second connection part located on the second end part and facing the second swing arm;
• and
• a second connecting rod slidably connected to the second connection part and rotatably connected to the second swing arm;
• and
• a flexible display comprising a foldable part and configured to continuously cover the first housing, the second housing, and the hinge mechanism, wherein the flexible display is fastened to the first housing and the second housing, and wherein the hinge mechanism is disposed opposite to the foldable part.

A hinge mechanism comprising:

• a main shaft comprising a first side and a second side opposite the first side;
• a first swing arm disposed on the first side and rotatably connected to the main shaft;
• a second swing arm disposed on the second side rotatably connected to the main shaft;
• and
• a synchronization assembly located between the first swing arm and the second swing arm along an axial direction of the hinge mechanism, wherein the synchronization assembly comprises:
• a first gear assembly comprising:
• a first gear member;
• and
• a first connecting rod slidably connected to the first gear member and rotatably connected to the first swing arm;
• and
• a second gear and assembly comprising:
• a second gear member engaged with the first gear member;
• and
• a second connecting rod slidably connected to the second gear member and rotatably connected to the second swing arm,
• wherein the synchronization assembly is configured to:
• synchronously rotate the first gear assembly and the second gear assembly towards each other during a folding process of an electronic device, and
• synchronously rotate the first gear assembly and the second gear assembly away from each other during an unfolding process of the electronic device.