Una molla és una peça mecànica que utilitza l'elasticitat per treballar. Generalment fet d'acer de molla, s'utilitza per controlar el moviment de peces, alleujar impactes o vibracions, emmagatzemar energia, mesurar la mida de la força, etc. S'utilitza àmpliament en màquines i instruments. Els tipus de fonts són complexos i diversos. Segons la forma, hi ha principalment molles helicoïdals, molles volutes, molles de fulla, etc.
Els tres i fabricants de molles següents presenten les funcions principals de la molla:
①Control the movement of machinery, such as valve springs in internal combustion engines, control springs in clutches, etc.
② Absorb vibration and impact energy, such as buffer springs under automobiles and train cars, vibration-absorbing springs in couplings, etc.
③ Store and output energy as power, such as clock springs, springs in firearms, etc.
④Used as a force measuring element, such as a force measuring device, a spring in a spring balance, etc. The ratio of the load to the deformation of the spring is called the spring stiffness, and the higher the stiffness, the stiffer the spring.
