Couplings properties comparison
The evaluations based on size-based comparisons are intended to provide a general guide.◎Superior ○Good ×Inferior
| Coupling type | Composition | Non backlash | Torsional rigidity | Anti-misalignment (parallel) | Anti-misalignment (angle) | Anti-misalignment (end play) | Vibration absorptions |
|---|---|---|---|---|---|---|---|
| Flexible plate couplings | Polyimide, single plate | ◎ | ◎ | ○ | ○ | ||
| Carbon FRP, single plate | ◎ | ○ | ○ | ||||
| Stainless steel, single plate | ◎ | ◎ | × | ||||
| Polyimide, double plates | ◎ | ◎ | ◎ | ◎ | ○ | ||
| Carbon FRP, double plate | ◎ | ○ | ○ | ◎ | ○ | ○ | |
| Stainless steel, double plates | ◎ | ◎ | × | ||||
| Plastic couplings | Short | ◎ | × | ○ | |||
| Long | ◎ | ○ | ◎ | ○ | |||
| Oldham's couplings | Plastic slider | ○ | ○ | ◎* | ○ | ○ | |
| Metal slider | ◎ | ◎* | ○ | ||||
| Cushion couplings | Urethane cushion | ○ | ○ | ○ | ○ | ◎ | |
| Nylon cushion | ○ | ◎ | ○ | ||||
| Rigid couplings | ◎ | ◎ | × | × | × | ||
| Ball couplings | Single | ○ | × | ○ | ◎ | ||
| Double | ○ | ◎ | ◎ | ◎ |
* Regarding Oldham's couplings, three factors: parallel misalignment, load torque and rotation speed, synergistically multiply the speed of slider abrasion. Please make sure to keep parallel misalignment to a minimum level, when using in an application less tolerant to increased backlash.
Product outline
Flexible plate couplings
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Flexible plate couplings absorb shaft misalignment with zero-backlash, which is achieved by bending of a plate attached to the hub. There are two types of structure: single plate type and double plate type. Also, for your choice, we offer three different plate materials representing respective characteristics for the degree of flexibility, rigidity, etc. to match any application. |
Plastic couplings
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Plastic couplings have a structure where the hub part and the flexible part are integrally molded using engineering plastic. Short and long types are available for your choice. Long operational life and high reliability are offered for use in such light-load applications as encoders with a low price. |
Oldham's couplings
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Oldham's couplings absorb mainly parallel misalignment through the slider sliding along its groove. The major features are; that even a small diameter model is capable of relatively great torque ; that coupling components are separable for installation. Please note, however, large load torque together with large parallel misalignment will accelerate the progress of abrasion on the slider's groove, which can induce backlash. |
Cushion couplings
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Couplings with cushion pads absorb parallel and angular misalignments through the elasticity of 6 cylindrical buffing pads that are held between hubs from both sides. Each independent cushion pad, evenly receiving load, can serve to reduce vibrations / noises transmitted through such transmission systems for pulsatile rotation as pumps. |
Rigid couplings
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Rigid couplings have the highest torsional strength because the structure without flexibility is not tolerant to parallel or angular misalignment. Shaft holes on both sides are processed without re-fixing to achieve precise concentricity. |
Ball couplings
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Ball couplings transmit torque through the balls fitted in the keyway grooves on hubs. They have qualities of absorbing endplays. Double typed couplings offer tolerance to large parallel misalignment. |