Gear made of resin, and mold structure
US6883397B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 2001 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Jul 5, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/19995
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A gear made of a resin includes a substantially cylindrical rim having a plurality of teeth formed around an outer periphery thereof, a boss formed about a rotational center of the rim, and a web connecting the boss and the rim to each other. At least one groove is defined along outer surface of each tooth to divide the tooth in a widthwise direction of the tooth. As a result, a portion of the gear, in which the grooves are defined, is deformed in a reduced amount, leading to a reduced amount of deformation such as a warpage or sink in the entire gear, thereby providing an enhancement in tooth flank accuracy. Since the grooves are defined along the outer surfaces of the teeth, a lubricant such as grease can be supplied effectively to tooth flanks by previously applying the lubricant in the grooves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.