Metal bellows coupling
A metal bellows coupling , also known as a corrugated pipe coupling, is a connecting element ( coupling ) that enables the torsionally rigid, but somewhat axially and angularly offset connection of two shafts .
It is used in machines in manufacturing and automation technology and, compared to cardan shafts, is characterized by freedom from play and wear.
In automation technology, they are therefore used as a connecting element for servo motors and stepper motors and also as miniature bellows couplings, for example for pulse generators , servo potentiometers or tachometer shafts.
The special geometric shape of the bellows guarantees high torsional strength. At the same time, it enables the compensation of axial , radial and angular shaft misalignments. The bellows are usually made of stainless steel alloys , sometimes plastic or nickel. The connection of the corrugated pipe coupling with the shafts is mainly frictional , e.g. B. with sockets and clamping screws.
Positive connections by means of feather keys , splined shafts or other toothed elements are not suitable because they are only partially free of play.
Compact machine constructions with little installation space or places that are difficult to access often require the use of plug-in couplings that ensure high torsional rigidity and transmission accuracy.
Features and properties of a metal bellows coupling are:
- Compensation of axial misalignment with low restoring forces
- absolute freedom of play
- low mass moment of inertia
- wear-free and durable
- with suitable material electrically insulating
- Temperature range from −30 ° C to +300 ° C (stainless steel, nickel)
- quick and easy assembly
- safe torque transmission even at high speeds