What should the gear meshing clearance of the reducer be in mm?
2 Answers
The meshing clearance of the driving and driven bevel gears is generally 0.10-0.35mm for new gears, 0.70mm is allowed for overhaul, and the service limit is 1.00mm. If it exceeds the standard, appropriate adjustments can be made while ensuring normal meshing. Below are some introductions about the driving and driven bevel gears: 1. Non-adjustable: The contact surface and backlash of the driving and driven cylindrical gears cannot be adjusted. During assembly, their meshing position must be symmetrical to align the two cylindrical gears. 2. Inspection of meshing clearance: After correctly adjusting the bearing clearance and the meshing position of the gears, if the backlash exceeds 0.8mm (service limit is 1.00mm), the gears should be replaced.
The numerical value of gear backlash in speed reducers is actually quite particular. Based on my experience with numerous mechanical cases, it typically ranges between 0.1 to 0.3 millimeters, with the ideal value being 0.15 to 0.2 millimeters. Neither too large nor too small is acceptable. For instance, when the clearance exceeds 0.3mm, it causes clattering noises during transmission and increases the risk of gear disengagement; whereas a clearance below 0.1mm may lead to overheating and seizure. Different speed reducers have varying requirements - for industrial equipment, I usually set it around 0.18mm, while automotive applications might require a tighter clearance of about 0.15mm. Adjustment can be made using feeler gauges or micrometers. During routine maintenance, pay attention to gear materials as steel gears and plastic gears have slight differences in clearance requirements. Never overlook regular inspections, as this can save significant repair troubles.
