Method for constructing a liquid-impervious electric motor assembly
US5853643A · kind A · utility
Inventor
Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/3061
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for encapsulating an electric motor in resinous material by an injection molding process comprises providing a motor assembly having an armature and associated drive shaft supported at one end by a bearing bracket. The motor is inserted into a cavity of a multi-piece mold in which one part of the mold has a bore for slidingly receiving the motor shaft with the bearing bracket in close abutment with the mold. The motor is thus supported centrally of the mold cavity. Liquid resinous material is injected into the mold preferably from a side of the motor opposite the motor shaft such that the liquid material forces the motor bearing bracket against the apertured part of the mold. The resinous material is thereby prevented from entering into the bearing bracket into contact with the motor shaft. In order to positively locate the motor in a predetermined orientation within the mold cavity, the bearing bracket may be provided with a small recess into which a cooperating projection of the mold is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.