Description 
Diagram showing the construction of a 2lobed cycloidal rotor, like that found in a Roots blower. The red curve is an epicycloid (outside the larger generating circle with diameter D, black) and the blue curve is a hypocycloid. The smaller circles are 1/4 the diameter of the larger circle. The solid curve is the profile of the rotor  half is the epicycloid and half is the hypocycloid. 

Date  
Source  Own work  
Author  Inductiveload  
Permission (Reusing this file) 


SVG development 