Rotary expansible chamber devices – Moving cylinder – Rotating
Reexamination Certificate
2005-05-17
2005-05-17
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Moving cylinder
Rotating
C418S166000, C074S462000
Reexamination Certificate
active
06893238
ABSTRACT:
A displacement-type ring gear machine includes a casing including a gear chamber comprising a supply port and a discharge port, an internal gear accommodated in the gear chamber and comprising an external toothing, and an external gear eccentric to the internal gear and comprising an internal toothing meshing with the external toothing so as to form expanding and contracting fluid cells which direct the working fluid from the supply port to the discharge port. The meshing toothings comprise a radial clearance and a tangential clearance which is smaller than the radial clearance. The tips or roots of at least one of the two toothings comprise a profile derived from a cycloid. The profile of the tips and roots of the at least one of the toothings is formed by or from the locus of a point on the circumference of a pitch circle rolling on a fixed circle, the radius of the pitch circle becoming continuously smaller from the two flank portions to the vertex portion in the case of the tips and becomes continuously larger or continuously smaller in the case of the roots.
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European Search Report, from European Application No. 02 00 4344, dated Jul. 3, 2002.
Eisenmann Siegfried A.
Härle Hermann
RatnerPrestia
Trieu Theresa
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