Drive device, image forming apparatus, and grease composition
AssigneeRicoh Company, Ltd.
InventorsToshiyuki Kabata, Kumiko Seo, Masahiro Ishida, Naoki Matsuda, Teruyoshi Tanaka
Life of this patent
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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.
Claims10
A drive device comprising:
- a gear, a hole being present in the gear;
- a shaft, configured to pass through the hole;
- and
- a grease composition, in a clearance between the shaft and an inner peripheral surface of the hole, wherein
- the gear is configured to rotate on a peripheral surface of the shaft,
- at least one of the gear and the shaft being made of a resin,
- the clearance is in a range of 10 to 110 μm,
- the grease composition includes a hydrocarbon base oil and lithium soap,
- 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, and
- a consistency of the grease composition is in a range of 360 to 400, wherein the grease composition includes olefin resin powder as a solid lubricant, and wherein the olefin resin powder is a polyethylene powder.
Dependencies are inferred from the claim text.