Abstract
The load-carrying capacity of medium hardness gears was investigated from the viewpoint of gear-manufacturing methods (hardness, gear accuracy and tooth surface roughness). First, the gear accuracies and tooth surface roughnesses of ground gears, hobbed gears and finish hobbed gears were examined in detail. From the test results, it is found that the new finish-hob, which has many gashes and a positive rake angle, is useful for the improvement of gear accuracy and tooth surface roughness. Secondly, the surface durability of gear pairs with a combination of ground gear and hobbed gear (or finish hobbed gear) was investigated by using a power circulating type gear testing machine. The test results reveal that the pinion (ground gear) should be substantially harder than the gear (mating hobbed gear or finish hobbed gear) in order to obtain higher load-carrying capacity of medium-hardness gears. And, it is clear that the finish hobbed gears have many advantages in manufacturing and performance of hardened and tempered gears.
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