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:
Jun. 07, 2022
Filed:
Apr. 27, 2021
Kabushiki Kaisha Toyota Jidoshokki, Aichi-ken, JP;
Nok Corporation, Tokyo, JP;
Fumiya Shinoda, Kariya, JP;
Daisuke Masaki, Kariya, JP;
Takayuki Hirano, Kariya, JP;
Shintaro Kashiwa, Kariya, JP;
Naoki Takani, Kariya, JP;
Yohei Miki, Aso, JP;
KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, Aichi-ken, JP;
NOK CORPORATION, Tokyo, JP;
Abstract
A housing unit of a Roots pump includes a rotor housing, which includes a peripheral wall, and a cover member, which closes an opening of the rotor housing. At least one of a mating surface of the peripheral wall or a mating surface of the cover member includes an annular first groove accommodating a seal member. The rotor housing includes a bulging portion including a second groove. The seal member incudes first projections, which project from an annular seal body, and a second projection, which projects further radially inward from the seal body than the first projections. Each first projection includes a distal end that contacts a side surface on a radially inner side or on a radially outer side of the first groove. The second projection is arranged in the second groove to determine the position of the seal body in the first groove.