The clockwork spring is a slender spring material that is wound into a flat spiral spring. After one end of the spring is fixed, and the other end is subjected to a torque, the material is subjected to a bending moment to produce bending elastic deformation, so the spring produces torsion in its own plane. Its deformation The size of the angle is proportional to the torque.
The winding forming of the clockwork spring is relatively simple, its stiffness is small, and it generally works under static load. Because the number of winding turns can be many, the deformation angle is large, and it has the characteristics of storing more energy in a small volume. The shape of the carrying surface can be a rectangular single-volume storage capacity, which is more used.
Flat springs are divided into non-contact and contact types according to whether the adjacent coils are in contact or not. Their uses, characteristics, and design calculation methods are different.
Non-contact springs are not in contact with each coil during operation, and are often used to produce reaction torque. For example, compression springs and instruments used for motor brushes, hairsprings in clocks, etc. fall into this category.
The adjacent springs of the contact-shaped spring are in contact with each other, and have a large number of turns, which can store a large amount of energy, and are often used as the prime mover in various instruments or clock mechanisms.