Planetary air motor for feeding welding wire - has two internal gear sets driven by airflow from channel at edge of peripheral channel

摘要

The planetary air motor has two internal gearings employing two internally toothed ring gears. One ring gear rotates and meshes with a first rim of a two-rim pinion, the other gear forms an inter tooth space with a second rim of the pinion that is freely mounted on an eccentric journal of a pinion carrier and has radial through slots in the tooth spaces. The inter tooth space is limited by a flange at once face and by a fixed washer at the other face of the fixed gear and is divided into two inter tooth working zones A and B. Zone A communicates with the compressed air line and the other one (B) with the atmosphere. The pinion carrier has a main channel and an additional channel with an inside bore that is smaller than that of the main channel and which is isolated from the latter.