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Mainspring

noun

Noun

1
The principal spring of a clockwork mechanism, which drives it by uncoiling.
"He was wise, for he had seen a long succession of mechanical toys arrive to boast and swagger, and by-and-by break their mainsprings and pass away."
2
the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism wordnet
3
The most important reason for, or element of, something. figuratively
"My daughter is the mainspring of my life."

From main + spring. For figurative sense, compare spring (“source, origin”).

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