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:
Dec. 02, 2008
Filed:
Oct. 31, 2006
Shinya Yamamoto, Kariya, JP;
Ryosuke Koshizaka, Kariya, JP;
Yuya Izawa, Kariya, JP;
Masahiro Inagaki, Kariya, JP;
Kentaro Ishihara, Kariya, JP;
Shinya Yamamoto, Kariya, JP;
Ryosuke Koshizaka, Kariya, JP;
Yuya Izawa, Kariya, JP;
Masahiro Inagaki, Kariya, JP;
Kentaro Ishihara, Kariya, JP;
Kabushiki Kaisha Toyota Jidoshokki, Kariya-Shi, JP;
Abstract
A vacuum pump includes a housing assembly having an oil-reservoir chamber in which a lubricating oil is stored; a pair of screw rotors disposed in the housing assembly and engaged with each other; a pair of rotary shafts connected to the rotors, respectively; a plurality of bearings supporting each of the rotary shafts and having an opening; an oil-feed pump for feeding the lubricating oil from the oil-reservoir chamber to the bearing; an oil-circulation passage provided for circulating the lubricating oil from the oil-feed pump to the oil-reservoir chamber through the bearing; a cover provided at the opening of the bearing to close the opening of the bearing with a clearance remained, the cover permitting the lubricating oil to enter the bearing through the clearance; and an oil-escape passage provided adjacent to the bearing for returning to the oil-reservoir chamber the lubricating oil not entering the bearing.