TECHNIQUE FOR APEX-SEAL PROFILE DESIGN
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United States of America Patent
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Aug 27, 2015
app pub date -
Aug 28, 2013
filing date -
Aug 31, 2012
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Abstract
A method for designing an apex seal, a rotor housing, and a rotor includes defining a rotor radius describing a distance between a rotor housing and a specified point within a rotor pitch curve p1, defining a switch angle describing a portion of an apex seal of the rotor to contact the rotor (START) housing, and identifying a generating curve g1 from the rotor radius and the switch angle. A conjugate curve g2 represents an envelope of patterns traced by the generating curve g1 as the rotor pitch curve p1 is moved along a housing pitch curve p2. A rotor flank curve g3 represents an inside envelope of patterns traced by the conjugate curve g2 as the housing pitch curve p2 is moved along the rotor pitch curve p1. Curves g1, g2, and g3 may represent profiles of an apex seal, a rotor housing, and a rotor, respectively.
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