SCREW PUMP AND SCREW ROTOR - TOYOTA JIDOSHOKKI KK

Title:

SCREW PUMP AND SCREW ROTOR

Document Type and Number:

WIPO Patent Application WO/2008/029759

Kind Code:

A1

Abstract:

The cross section of the tooth profile of a first screw rotor (17) in the direction perpendicular to its axis includes a tip arc (A1B1), a bottom arc (C1D1), a first curve (A1C1), and a second curve (B1D1). The first curve (A1C1) is a first trochoidal curve connecting the first end (A1) of the tip arc (A1B1) to the second end (C1) of the bottom arc (C1D1). The second curve (B1D1) connects the second end (B1) of the tip arc (A1B1) to the first end (D1) of the bottom arc (C1D1). The second curve (B1D1) is a composite curve comprising an involute curve (B1E1) and a second trochoidal curve (E1D1), which are continuous with each other at a first intersection point (E1). Whereby, this screw pump (11) can be excellent in suppression of a fluid leakage.

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Inventors:

IZAWA YUYA (JP)
YAMAMOTO SHINYA (JP)
INAGAKI MASAHIRO (JP)
YOSHIKAWA MAKOTO (JP)

Application Number:

PCT/JP2007/067125

Publication Date:

March 13, 2008

Filing Date:

September 03, 2007

Export Citation:

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Assignee:

TOYOTA JIDOSHOKKI KK (JP)
IZAWA YUYA (JP)
YAMAMOTO SHINYA (JP)
INAGAKI MASAHIRO (JP)
YOSHIKAWA MAKOTO (JP)

International Classes:

F04C2/16; F04C18/16

Domestic Patent References:

WO2005113984A1

2005-12-01

Foreign References:

JPH08277790A	1996-10-22
JPS5746083A	1982-03-16
JP2005351238A	2005-12-22
JP2005351238A	2005-12-22

Other References: