Patent ID: 7270106

Claim:
A rotary displacement device having a housing, said housing comprising: an outer spherical cover, an inner generally spherical surface disposed therein, having a spherical center and an inner spherical cover, an outer generally spherical surface disposed thereout, sharing said spherical center, a predetermined number of identical substantially circular free-planetary gears snugly disposed thereof between said inner and said outer spherical covers possessing a plurality of teeth, said teeth defined by a pitch cone, said pitch cone possessing an apex coinciding with said spherical center, a first large gear snugly disposed thereof between said inner and said outer spherical covers and possessing a plurality of teeth, said teeth of said first large gear possessing surfaces proportioned to tightly mesh with said teeth of said free-planetary gears, and arranged about a first pitch surface, said first pitch surface ruled to said spherical center and further possessing a first number of lobes freely selected from a group consisting of one more than said number of free-planetary gears and one less than said number of said free-planetary gears, said first pitch surface being more precisely defined by a first predetermined mathematical curve, a second large gear snugly disposed thereof between said inner and said outer spherical covers and possessing a plurality of teeth, said teeth of said second large gear possessing surfaces proportioned to tightly mesh with said teeth of said free-planetary gears, and arranged about a second pitch surface, said second pitch surface ruled to said spherical center and further possessing a second number of lobes freely selected from a group consisting of zero, and one more than said number of said free-planetary gears, and one less than said number of said free-planetary gears, said second pitch surface being more precisely defined by a second pre-determined mathematical curve, said first and said second predetermined mathematical curves chosen in such a way as to enjoin said first large gear to execute precessional rotation relative to said second large gear when said first and said second large gears are entrained with said predetermined number of said free-planetary gears, axis-constraining means by which the rotation of at least one of said outer spherical cover, said inner spherical cover, said first large gear, and said second large gear be substantially constrained to a fixed axis in three dimensional space.