Rotary expansible chamber devices – Moving cylinder – Rotating
Reexamination Certificate
2011-06-28
2011-06-28
Denion, Thomas E (Department: 3748)
Rotary expansible chamber devices
Moving cylinder
Rotating
C418S150000, C418S169000, C418S171000
Reexamination Certificate
active
07967586
ABSTRACT:
The present invention enables the manufacture of a trochoid pump having a crescent which has been considered theoretically impossible, by employing an inner rotor of a trochoid pump. An inner rotor having a predetermined number N of teeth that is equal to or larger than 4 is formed in advance. In order to manufacture an outer rotor with a predetermined number (N plus a natural number equal to or larger than 2) of teeth, row circles of a diameter slightly smaller than that of a drawn circle are disposed so as to bring the row circles into contact with the tooth bottomland of the inner rotor tooth profile, the inner rotor tooth profile is rotated by half a tooth about the center of the inner rotor and the outer rotor tooth profile is also rotated by half a tooth of the predetermined number (N plus a natural number equal to or larger than 2) of teeth about a virtual center of the outer rotor including the row circles, an established center is determined from the virtual center or the like at the time at which the contact state is assumed, a reference circle is drawn that has a radius from the established center to the row circles and that has the total predetermined number (N plus a natural number equal to or larger than 2) of the equidistantly spaced row circles to form the row circles as outer rotor tooth tips, thereby manufacturing the outer rotor tooth profile.
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European Search Report dated Jun. 30, 2010.
Fujiki Kenichi
Watanabe Takatoshi
Davis Mary A
Denion Thomas E
McGinn IP Law Group PLLC
Yamada Manufacturing Co., Ltd.
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