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1. (WO2017040136) OPTICAL ENCODER AND MOTOR ASSEMBLY

Pub. No.:    WO/2017/040136    International Application No.:    PCT/US2016/048340
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Aug 25 01:59:59 CEST 2016
IPC: B66B 1/34
G01D 11/24
Applicants: OTIS ELEVATOR COMPANY
Inventors: HAN, HakKi
Title: OPTICAL ENCODER AND MOTOR ASSEMBLY
Abstract:
A reflective optical encoder (40) assembly includes a motor and brake assembly at least partially in a motor and brake housing (42). An encoder housing is at least partially received in a cavity (34) of the motor and brake housing. The reflective optical encoder includes an encoder disk (50) and an encoder shaft (44) that rotate with a shaft of the motor. The assembly includes holes (54, 56, 58) in the encoder disk. A seal (80) at an interface between the encoder housing and the encoder shaft to prevent contaminants from the cavity from entering the encoder housing and a packing inside the encoder housing. A packing (84) is situated to prevent any dust or debris associated with the encoder shaft rotating relative to the seal from getting on the encoder disk.