Shaft assembly and electric valve

A shaft assembly, comprising a compound motion assembly, a shaft rod assembly and a bearing assembly, wherein

• the compound motion assembly is rotatable around an axis thereof and is movable, and the shaft rod assembly is movable when being pushed by the compound motion assembly;
• the shaft rod assembly comprises a shaft rod and a bushing that are connected to each other, and the shaft rod comprises a bottom wall portion;
• a part of the compound motion assembly is located between the bushing and the bottom wall portion in an axial direction of the shaft assembly;
• the bearing assembly is provided between and can abut against the bushing and the compound motion assembly in the axial direction of the shaft assembly, and/or, the bearing assembly is provided between and can abut against the bottom wall portion and the compound motion assembly in the axial direction of the shaft assembly;
• and
• the bearing assembly comprises a plurality of rotating members that are arranged in a circumferential direction of the compound motion assembly, and the plurality of rotating members are rotatable under an action of the compound motion assembly.