Rotary expansible chamber devices – Heat exchange or non-working fluid lubricating or sealing – With pump for non-working fluid
Reexamination Certificate
2006-10-31
2008-12-02
Trieu, Theresa (Department: 3748)
Rotary expansible chamber devices
Heat exchange or non-working fluid lubricating or sealing
With pump for non-working fluid
C418S094000, C418S102000, C418S201100, C184S006160, C184S006180, C384S462000, C384S474000
Reexamination Certificate
active
07458790
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.
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Inagaki Masahiro
Ishihara Kentaro
Izawa Yuya
Koshizaka Ryosuke
Yamamoto Shinya
Kabushiki Kaisha Toyota Jidoshokki
Morgan & Finnegan , LLP
Trieu Theresa
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