The main core parts of a harmonic reduction gear consist of an internal gear rigid wheel, an external gear flexible wheel, a flexible bearing, and a wave generator. The wave generator, driven by a motor, is installed inside the flexible bearing, turning it and the flexible wheel into an elliptical shape. At the long axis of the ellipse, the flexible wheel's partial gears mesh with the rigid wheel's teeth. Due to the gear difference between the flexible wheel and the rigid wheel, a reduction output is generated. The harmonic reduction gear is a precision control component in the new generation of smart factories, becoming a necessary component in all smart factory equipment due to its compact and light electric control mode.
The harmonic reduction gear must be installed in a sufficiently clean environment, ensuring no foreign objects enter the reducer during the installation process to avoid damage during use.
Ensure that the gear surfaces and flexible bearings are always fully lubricated. It is not recommended to use the gear surfaces facing upward as it may affect lubrication efficiency.
After installing the cam, ensure that the flexible wheel and the rigid wheel mesh symmetrically at 180° (as shown in Figure 1). If deviated to one side (as shown in Figure 2), it will cause vibrations and quickly damage the flexible wheel.
After installation, run at a low speed (100 RPM) initially. If there is abnormal vibration or noise, stop immediately and contact our company to avoid damage to the reducer caused by incorrect installation.
Evenly coat the flexible bearing with grease, and inject 80% grease into the cavity at position A (use designated grease and do not replace arbitrarily to avoid damage to the reducer). Install the wave generator on the input end motor shaft or connecting shaft, and secure it with screws and flat washers.
Evenly coat the inner wall of the flexible wheel with a layer of grease, then inject grease into position B of the flexible wheel space, approximately 80% of the flexible wheel cavity (use designated grease and do not replace arbitrarily to avoid damage to the reducer). Install the reducer as shown, ensuring the long axis of the wave generator aligns with the long axis of the flexible wheel. Once in place, lightly tighten the screws to secure the reducer.
Set the motor speed to around 100 RPM, start the motor, and tighten the screws in a crisscross pattern (see Appendix 1), increasing the tightening torque evenly in four to five increments. (Refer to Appendix Table 1 for the corresponding tightening torque of the screws.) All connecting and fixing screws should be grade 12.9 and coated with Loctite 243 threadlocker (or equivalent) to prevent screw failure or loosening during operation.
The machining requirements for the installation plane connected to the reducer include: flatness of 0.01mm, perpendicularity to the axis of 0.01mm, and concentricity of threaded holes or through holes with the axis of 0.1mm.
When using the reducer, if the output end (the output end shown above) is always facing downwards (this usage is not recommended), the grease injected into the space of the inner wall of the flexible wheel needs to cover the meshing gear surface (that is, spaces A and B must be filled with grease) or contact our company. Use designated grease and do not replace arbitrarily to avoid damage to the reducer.
Static sealing should be used between the rigid wheel of the reducer and the installation plane of the input end to ensure that grease does not leak during the use of the reducer, preventing damage from working with insufficient or no oil.
