Installation error of gear pair 1. Parallelism error of axis △fx, △fy: ≤ parallelism tolerance fx, fy 2. Center distance deviation of gear pair △fa: the difference between actual center distance and nominal center distance. That is: a\'-a=△fa. Regulations: -fa ≤△fa ≤+fa. Which situation should be avoided (which situation is the most dangerous)? Why? Accuracy index of gear pair 1. Contact spot: The contact polishing marks distributed on the tooth surface of the assembled gear pair after operation under slight braking. Tooth length direction: The percentage of the ratio of the length b\'\' of the contact mark (minus the length c of the disconnected part) to the working length b\' (minus the chamfer). That is: Tooth height direction: The percentage of the ratio of the average height h\'\' of the contact mark to the working height h\'. That is: 2. Gear pair side clearance: divided into normal side clearance jn and circumferential side clearance jt. Normal side clearance jn: The minimum distance between the non-working surfaces of the assembled gear pair when the working surfaces are in contact. Circumferential backlash jt: The circumferential runout of an assembled gear pair when one gear is fixed, measured in arc length on the pitch circle.
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