Disc coupling: by definition, transmits torque from a driving to a driven bolt tangentially on a standard bolt circle. Torque is shared between the bolts through thin, stainless steel discs assembled in a pack. Misalignment is accomplished by deforming the material between the bolts.
A disc coupling is a high-performance motion control (Servo) collar designed to be the torque transmitting element (connecting two shafts) while accommodating misalignment. It is flexible while remaining torsionally strong under high torque loads. Typically, disc couplings can handle speeds up to 10,000 RPM.
There are two different styles of disc coupling:
Single Disc Style couplings are composed of two hubs (the ends of the collar, which are typically made from aluminum, but stainless steel is used as well) and a single, flat, stainless steel disc spring
Double Disc-Style coupling is composed of two hubs but has an additional center spacer sandwiching two disc springs. The center spacer can be made of the same material as the hubs but is sometimes available in insulating acetal, making the coupling electrically isolating.
The difference between the two styles is that single disc couplings cannot accommodate parallel misalignment due to the complex bending required of the lone disc. Double disc styles allow the two discs to bend in opposite directions to manage parallel offset better. The discs are fastened to the hubs (and center spacer on double disc styles) with tight-fitting pins that do not allow any play or backlash between the disc and the hubs. The discs can be bent easily, and as a result, disc couplings have some of the lowest bearing loads available in motion control collars.
Disc couplings are an excellent solution for high-speed applications with torsionally stiff and still flexible. The downside is that they are more delicate than the average coupling and can be damaged if misused. Special care should ensure that misalignment is within the coupling ratings.
Advantages of disc coupling
1. Eliminates the need for lubrication and coupling maintenance
2. Coupling can be inspected without disassembly
3. Condition of disc packs can be inspected with a strobe light while the machine is running
4. Note: It is not recommended that couplings be operated without coupling guards.
5. Easy to assess equipment misalignment
6. Torsionally rigid without any backlash
7. No wearing parts
8. Resistance to harsh environments
9. Long life when properly sized and aligned
10. High power density (higher torque for a given outside diameter)
- Suitable for middle/low speed, long spacer distance applications
- Simple structure, easy mounting and dismounting, small dimensions, lightweight, high torque
- Absorb more enormous misalignments, low noise, long service life, maintenance-free
- Apply to pumps, fans, rolling mill, etc.
A B L F Mass(kg) TAL6175 0.39 3.7 10.8 10000 175 122 310 90 10.4