Abstract
The present study is devoted to investigation of spur gears with a conchoidal path of contact and a convex-convex contact between teeth. The load capacity and energy efficiency were evaluated using both theoretical and experimental approaches. The theoretical analysis showed that the conchoidal gear pairs are 5–21% stronger in terms of contact stress and have similar energy efficiency as compared to the involute gear pairs of the same configuration. Experiments were conducted on a gear test rig. Its energy efficiency was determined by measuring the active power of the motor driving the pinion shaft and controlling the torque at the gear shaft. The load capacity of the tested gear pair was estimated by analysing changes in the energy efficiency. It was found that the conchoidal gear pair has more than 20% higher load capacity and slightly higher energy efficiency, which agrees well with the mentioned theoretical results. Thereby, the study concludes a substantially higher load capacity of the conchoidal gears compared to the traditional involute ones.
Highlights
Gears are widely used to transmit motion and energy in mechanical systems
The theoretical analysis conducted for different values of the reference profile parameters and gear ratio showed that the conchoidal gear pairs are 5–21% stronger in terms of contact stress and have similar energy efficiency if compared to the traditional involute gear pairs of the same configuration
These findings were experimentally validated using a gear test rig in which the energy efficiency was determined by measuring the active power of the motor driving the pinion shaft for a controlled value of the torque at the gear shaft
Summary
Gears are widely used to transmit motion and energy in mechanical systems. It is difficult to imagine a modern transport machine that does not include gear trains. The most commonly used gears have teeth with an involute active profile generated by straight lines. The set of instantaneous contact points between such teeth forms a straight path of contact. The advantages of involute gears include high manufacturability, relatively small sensitivity to centre distance errors and simplicity of the reference profile. Relatively large curvatures of the mating teeth result in large contact stresses, which strongly limits the load capacity of involute gears. Development of non-involute gear drives has a significant scientific and practical interest
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