Screw fluid machine and screw gear used in the same
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United States of America Patent
Stats
-
Oct 7, 1997
Grant Date -
N/A
app pub date -
Aug 17, 1995
filing date -
Aug 19, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a screw fluid machine including male and female rotors which are engaged with each other, a casing for accommodating both the male and female rotors, fluid working rooms which are formed by the male and female rotors and the casing, and fluid inlet and outlet ports which are provided in the casing so as to intercommunicate with one end portion and the other end portion of the working rooms, the helix angle of the screw gear constituting each of the male and female rotors is set to be continuously varied in a helix advance direction. Further, the screw gear is designed so that the peripheral length of a pitch cylinder in a helix advance direction on a development of a tooth-trace rolling curve on the pitch cylinder of the screw gear can be expressed by a substantially monotonically increasing function.
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