A gear coupling is one of the simplest and most common types of coupling in use today. It is also one of the most diffcult to design and evaluate, because of the number of varibles that can affect its successful operation. Some of these varibles are:
- Tooth design
- Straight teeth
- Pressure angle of tooth
- Amount of backlash
- Accuracy of tooth spacing
- Material
- Medium-carbon steel, alloy steel
- Type of core heat treatment: as –forged, normalixed, heat treated
- Type of surface harding
- Lubrication
- Oil
- Grease
- Sealed lubrication
These are just some of the important varibles and indicate why on general criteria have been established. Experience and successes are the real criteria and the proof of a design.
See Standard Size Chart
How gear couplings work
A gear coupling usually consists of four major componnents, when two shafts are to be connected by this type of coupling, a coupling half (consisting of one of hub and its mating sleeve) is keyed to each shaft, the shaft ends are brought togther, and the sleeves are bolted together securely. Since the hubs have external teeth on the sleeves, the connection is in effect an internal spur gear drive where the gear ratio is 1:1. When a coupling is misaligned (pivot position) With no load. Only two teeth 90 degree from the plane of misalignment (tilted postion) come into contact.
- Where gear coupling are used in the following types of equipment:
- centrifugal pumps, conveyors, exciters, fans, generators.
- blower, mixers, hydrauli pump, compressors, steel mills.
- auxiliary rquipment, cranes, hoists, mining manchinery.
- Three basic moments in the gear coupling
- The moment generated from transmission torque and angle (rotated around the z-z axis)
- The moment genrated from frictional loading (rotated around the z-z axis).
- The moment genrated from displacement of load from its condition (rotating around the y-y axis)
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