Electric lock and clutch mechanism thereof

An electric lock, comprising:

• a lock cylinder, the lock cylinder being operable with a key, the lock cylinder having a latch drive lever, the latch drive lever extending along an axis and being rotatable about the axis;
• and
• a clutch mechanism, the clutch mechanism comprising:
• a fixed base, the fixed base being fixedly connected to the lock cylinder;
• a rotatable knob, the rotatable knob being rotatably disposed on the fixed base, the rotatable knob having a first engagement portion;
• a clutch part, the clutch part being disposed movably along the axis and rotatably about the axis on the fixed base, the clutch part having a driving hole, a second engagement portion, and a first cam surface, the latch drive lever passing through the driving hole, the driving hole having a first pushing portion and a second pushing portion, the clutch part rotating the latch drive lever in a first rotation direction through the first pushing portion, the clutch part rotating the latch drive lever in a second rotation direction through the second pushing portion, the first rotation direction being opposite to the second rotation direction, the first pushing portion and the second pushing portion not abutting against the latch drive lever at the same time;
• a linkage part, the linkage part being disposed rotatably about the axis on the fixed base, the linkage part having a second cam surface, the linkage part being adjacent to the clutch part along the axis, the first cam surface and the second cam surface abutting against each other;
• a spring, the spring pushing the clutch part to keep the first cam surface to against the second cam surface;
• and
• a driving device, the driving device being coupled to the linkage part, the driving device driving the linkage part to rotate about the axis;
• wherein the driving device drives the linkage part to rotate to make the first cam surface and the second cam surface to slide relative to each other, so that the clutch part moves along the axis to make the second engagement portion to be engaged with or disengaged from the first engagement portion.