Patent ID: 8198889
Filing Date: 2012-06-12
Classification: G01D

Abstract:
1. A magnetic sensor for an elevating motor, comprising: a) a gear box internally having a reduction gear unit and a transmission gear meshed with the reduction gear unit; b) a motor secured to the outside of the gear box for driving the gears within the gear box; c) a screw rod passing through the gear box and screwed with the transmission gear; and d) a minor sleeve made by a magnetically non-permeable material and having an opening, wherein the gear box is provided with a mounting hole for the insertion of a magnetic sensor into the gear box, thereby creating a built-in structure for detecting magnetic elements rotatable with the transmission gear such that the change of the internal magnetic force lines within the housing may be detected by the magnetic sensor, thereby achieving a non-contact rotation detection; and wherein the magnetic sensor includes: i) a circuit board provided with magnetic induction elements; and ii) a transmission line extended outwards from the circuit board for sending out detection signals; said opening of said minor sleeve being sealed off after the insertion of said circuit board into said minor sleeve; wherein a plurality of projections are formed at the periphery of the opening of the minor sleeve for fitting into a rubber base in place, the rubber base is locked in the mounting hole of the gear box such that the magnetic sensor is positioned within the gear box and a mounting aperture is formed at the center of the rubber base for the insertion of the upper portion of the minor sleeve in position, and wherein two elastic locking lugs are symmetrically arranged at the bottom of the rubber base.