To ensure the accurate alignment of the reducer parts of this model, the core is to find the positioning benchmark, align the key marks, and control the assembly accuracy . The specific methods are as follows:
1. Clarify the core positioning benchmark to avoid assembly deviation
Taking the stop (step surface) of the reducer casing as the benchmark, the pin tooth shell needs to fit the stop surface when installing to ensure that the pin tooth shell and the casing are coaxial and have no tilt.
The output shaft is installed with the inner ring of the bearing positioned, and the shaft shoulder fits closely with the end face of the cycloidal wheel without any gap, ensuring the accurate axial position of the cycloidal wheel.
The cooperation between the input shaft and the eccentric sleeve is based on a flat key or spline to ensure that the eccentric direction is consistent after the eccentric sleeve is installed (double eccentric sleeves need to be symmetrically distributed) to avoid deviation of the cycloid wheel motion trajectory.
2. Align the key marks to ensure the correct engagement phase
The cycloidal wheel and the eccentric sleeve usually have phase marks (such as dots and engraved lines). During installation, the two marks need to be aligned. The double cycloid wheel needs to be staggered by the specified angle (commonly 180°) according to the manufacturer's requirements to avoid meshing misalignment.
The distribution of the pin teeth on the pin tooth shell needs to match the tooth shape of the cycloidal wheel. If the pin tooth shell has a positioning pin hole, the positioning pin needs to be inserted and then the bolt is tightened to ensure that the pin teeth are evenly distributed around the circumference.
When the motor is connected to the reducer, the coupling or pulley must be aligned with the coaxiality and tested with a ruler or dial indicator. The deviation shall not exceed 0.1mm to avoid force deviation of the input shaft.
3. Control assembly operations and reduce human deviations
When assembling, hold the parts steadily with both hands and slowly align them with the mating surfaces. No forced squeezing or knocking is allowed to prevent parts from deforming and causing misalignment.
Tighten the bolts evenly in 2-3 times, and tighten symmetrically along the circumference to avoid over-tightening of a single bolt, causing components (such as pin tooth shells and end covers) to deflect and destroy the alignment accuracy.
Interference fit parts (such as bearings, eccentric sleeves) adopt hot assembly (80-100°C) or cold assembly processes to avoid part displacement and mating surface damage caused by hard smashing.
4. Use auxiliary tools for verification to ensure accuracy
Use a feeler gauge to check the fit between the pin tooth shell and the casing seam. The gap difference at each point should not exceed 0.02mm to ensure coaxiality.
Turn the input shaft manually and observe the meshing state of the cycloidal wheel and the pin teeth. If there is no jamming or excessive local force, it means the alignment is accurate.
After installation, use a dial indicator to detect the radial circular runout of the output shaft. The value does not exceed the manufacturer's specified range (usually ≤0.05mm) to verify the overall assembly alignment accuracy.
5. Clean the mating surface to eliminate interference from impurities
All positioning surfaces (stops, shaft shoulders, keyways, and the inner circle of the pin tooth shell) must be thoroughly clean and free of oil, iron filings, and burrs to avoid impurities that may cause the parts to fail to fit and cause false alignment.
The matching gap between the keyway and the flat key is controlled at 0.01-0.03mm, without looseness or overtightness, ensuring accurate circumferential positioning of shaft and sleeve parts.
