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:
Apr. 24, 2018
Filed:
May. 22, 2015
Toshiyuki Kabata, Kanagawa, JP;
Kumiko Seo, Kanagawa, JP;
Masahiro Ishida, Kanagawa, JP;
Naoki Matsuda, Kanagawa, JP;
Teruyoshi Tanaka, Kanagawa, JP;
Toshiyuki Kabata, Kanagawa, JP;
Kumiko Seo, Kanagawa, JP;
Masahiro Ishida, Kanagawa, JP;
Naoki Matsuda, Kanagawa, JP;
Teruyoshi Tanaka, Kanagawa, JP;
RICOH COMPANY, LIMITED, Tokyo, JP;
Abstract
A drive device includes a gear having a hole; a shaft that passes through the hole; and a grease composition that is held in a clearance between the shaft and an inner peripheral surface of the hole. The gear rotates on a peripheral surface of the shaft. At least one of the gear and the shaft is made of a resin. The clearance is in a range of 10 to 110 μm. The grease composition contains a hydrocarbon base oil and lithium soap serving as a thickener. A weight ratio of the hydrocarbon base oil to the lithium soap is in a range of 94.5:5.5 to 96.0:4.0. A consistency of the grease composition is in a range of 360 to 400.