Seal compensated geometry rotary motion device

A method of manufacturing an inner envelope trochoidal rotary device comprising a first working member having a trochoidal curve shaped peripheral profile surface and a second working member having an envelope curve shaped peripheral profile surface derived from the trochoidal curve, said second member envelope profile having a plurality of apices at which are mounted corresponding apex seal means, said apex seal means each having a sealing face profile for sealably engaging said profile surface of said first working member, said apex seal means defining working chamber spaces between said profile surfaces of said first and second working members, wherein said method comprises:

• selecting a generating circle, a base circle, and a drawing arm length having a tracing tip for generating an ideal trochoid profile,
• determining a common distance for each said apex seal means by which said apex seal means is radially offset from an ideal inner envelope profile derived from said ideal trochoid profile,
• replacing said tracing tip with a tracing disc having its center of curvature at said tracing tip and a radius equal to said common distance,
• generating a trochoidal swath profile, having radially spaced concentric inner and outer outlines, with said tracing disk, said drawing arm, and said base and generating circles,
• forming said first working member profile surface from said outer outline and said second working member profile surface from an inner envelope curve derived from said outer outline, such that said first working member profile surface is radially recessed by said common distance everywhere about the periphery thereof relative to said ideal trochoid curve and said second working member profile surface is radially enlarged by said common distance everywhere about the periphery thereof relative to said ideal inner envelope profile, and
• providing a groove along each apex on said second working member to correspondingly receive respectively said apex seal means therein such that said sealing face profiles are substantially continuous with said second working member profile surface at said respective apices.

A method of manufacturing outer envelope trochoidal rotary device each comprising a first working member having a trochoidal curve shaped peripheral profile surface and a second working member having an envelope curve shaped peripheral profile surface derived from the trochoidal curve, said second member envelope profile having a plurality of apices at which are mounted corresponding apex seal means, said apex seal means each having a sealing face profile for sealably engaging said profile surface of said first working member, said apex seal means defining working chamber spaces between said profile surfaces of said first and second working members, wherein said method comprises:

• selecting a generating circle, a base circle, and a drawing arm length having a tracing tip for generating an ideal trochoid profile,
• determining a common distance for each said apex seal means by which said apex seal means is radially offset from an ideal outer envelope profile derived from said ideal trochoid profile,
• replacing said tracing tip with a tracing disk having its center of curvature at said tracing tip and a radius equal to said common distance,
• generating a trochoidal swath profile, having radially spaced concentric inner and outer outlines, with said tracing disk, said drawing arm, and said base and generating circles,
• forming said first working member profile surface from said inner outline and said second working member profile surface from an outer envelope curve derived from said inner outline, such that said first working member profile surface is radially recessed by said common distance everywhere about the periphery thereof relative to said ideal trochoid curve and said second working member profile surface is radially enlarged by said common distance everywhere about the periphery thereof relative to said ideal outer envelope profile, and
• providing a groove along each apex on said second working member to correspondingly receive respectively said apex seal means therein such that said sealing face profiles are substantially continuous with said second working member profile surface at said respecive apices.