Abstract: An air compressor of the globoid-worm type having a rotor formed with a plurality of threads in meshing relation with two oppositely arranged star pinions. The rotor and star pinions are arranged in a single piece housing which incorporates all openings as required for assemblage and operation of the functional elements of the compressor. The rotor has an integral shaft which projects from the housing. A cover encloses an end of the housing and is provided with outlet passages for the air compressed in the housing. Oil injection openings are arranged in the housing for application of lubricant to the rotor for sealing and cooling purposes.

Abstract: A rotary worm fluid working machine in which a casing enclosed rotor, cooperable with one or more rotary pinions, is provided with a plurality of spiral thread grooves each having convergent side surfaces so that teeth on the pinion wheel enter the thread grooves with a clearance diminishing to contact prior to tooth exit. The clearance reduces shock loading on the pinion wheel and reduces pinion wheel tooth seal wear in conical worm machines due to relatively lower rotor-pinion wheel tooth velocities in the region of tooth seal-rotor contact.