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A gear coupling is a mechanical device for transmitting torque between two shafts that are not collinear. It consists of a flexible joint fixed to each shaft. The two joints are connected by a third shaft, called the spindle.
Each joint consists of a 1:1 gear ratio internal/external gear pair. The tooth flanks and outer diameter of the external gear are crowned to allow for angular displacement between the two gears. Mechanically, the gears are equivalent to rotating splines with modified profiles. They are called gears because of the relatively large size of the teeth.
Gear couplings and universal joints are used in similar applications. Gear couplings have higher torque densities than universal joints designed to fit a given space while universal joints induce lower vibrations. The limit on torque density in universal joints is due to the limited cross sections of the cross and yoke. The gear teeth in a gear coupling have high backlash to allow for angular misalignment. The excess backlash can contribute to vibration.
Gear couplings are generally limited to angular misalignments, i.e., the angle of the spindle relative to the axes of the connected shafts, of 4-5°. Universal joints are capable of higher misalignments.
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Maintenance Method:
Gear coupling maintenance generally is in accordance with the following methods:
1. Check the coupling tooth surface meshing situation, the contact area along the tooth height of not less than 50%, along the tooth width of not less than 70%, tooth surface shall not have serious pitting , wear and crack.
2. The coupling outside the ring beating no more than 0.03mm, round face round beating is no more than 0.02mm.
3. If need to remove the ring gear, you must use special tools, no beating, so as not to bend the axis or damage. When the equipment is installed, the ring gear should be heated to about 200 ℃ and then installed on the shaft. External ring gear and shaft interference is generally 0.01 ~ 0.03mm.
4. Back to the middle of the cylinder or other components should be based on the original mark and data assembly.
5. With a torque wrench evenly tighten the bolt.