The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 2010
Filed:
Sep. 03, 2007
Yuya Izawa, Kariya, JP;
Shinya Yamamoto, Kariya, JP;
Masahiro Inagaki, Kariya, JP;
Makoto Yoshikawa, Kariya, JP;
Yuya Izawa, Kariya, JP;
Shinya Yamamoto, Kariya, JP;
Masahiro Inagaki, Kariya, JP;
Makoto Yoshikawa, Kariya, JP;
Kabushiki Kaisha Toyota Jidoshokki, Aichi-ken, JP;
Abstract
A cross section of a tooth profile of a first screw rotor () perpendicular to the rotor axis includes a tooth top arc (AB), a tooth bottom arc (CD), a first curve (AC), and a second curve (BD). The first curve (AC) is a first trochoidal curve that connects a first end (A) of the tooth top arc (AB) to a second end (C) of the tooth bottom arc (CD). The second curve (BD) connects the second end (B) of the tooth top arc (AB) to the first end (D) of the tooth bottom arc (CD). The second curve (BD) is a composite curve formed by an involute curve (BE) and a second trochoidal curve (ED), which extend continuously from each other at a first intersection point (E). A screw pump () thus suppresses leakage of fluid with improved performance.