A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power. Couplings do not normally allow disconnection of shafts during operation. However, there is torque limiting couplings that can slip or disconnect when some torque limit is exceeded. The industry standard is the Falk coupling. Texas manufacturers trust Falk products for their high quality.
The primary purpose of these couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both. By careful selection, installation and maintenance of couplings, substantial savings can be made in reduced maintenance costs and downtime.
The Falk coupling is used in machinery for several purposes. The most common of which are the following.
* To provide for the connection of shafts of units that are manufactured separately such as a motor and generator and to provide for disconnection for repairs or alterations
* To provide for misalignment of the shafts or introduce mechanical flexibility
* To reduce the transmission of shock loads from one shaft to another
* To introduce protection against overloads
* To alter vibration of rotating units
Clamped or rigid compression couplings come in two parts and fit together around the shafts to form a sleeve. They offer more flexibility than sleeved models, and can be used on shafts that are fixed in place. They are large enough so that screws can pass all the way through the coupling and into the second half to ensure a secure hold. Flanged rigid couplings are designed for heavy loads or industrial equipment. They consist of short sleeves.
A sleeve coupling consists of a pipe whose bore is finished to the required tolerance based on the shaft size. Based on the usage of the coupling a keyway is made in the bore to transmit the torque using the key. Two threaded holes are provided to lock the coupling in position. Sleeve couplings are also known as Box Couplings. In this case, shaft ends are coupled together and are enveloped by the sleeve.