Elevator Door Motor Mounting Reduces Vibration

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Solution Overview

Problem

Elevator door driving systems face issues with noise and vibration due to the placement of the door motor, which can interfere with the ceiling plate and lack a compact configuration, leading to inefficient operation.

Innovation Solution

A door driving device with a driving motor mounted on a vertical portion of the door header, featuring a rotating shaft supported by bearings at both ends, a driving pulley coupled to the shaft, and a compact design that avoids interference with the ceiling plate, reducing vibrations and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the door motor is placed above the car body with the ceiling plate just below it, then the door driving device can be positioned in a conventional location, but the ceiling plate interferes with the door motor and a larger space is required

Engineering Contradiction:

Improveconventional door motor placementVSAvoidinterference between ceiling plate and door motor

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent repositions the door motor from a horizontal placement above the car body to a vertical placement on the side of the door header. This dimensional change allows the motor to be positioned in the vertical space alongside the door mechanism rather than occupying horizontal space that conflicts with the ceiling plate, thereby eliminating interference while maintaining conventional manufacturing approaches

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Object-affected harmful factors

If the door motor is positioned to avoid interference with the ceiling plate, then interference is eliminated, but the configuration becomes more complex and space-consuming

Engineering Contradiction:

Improveinterference between ceiling plate and door motorVSAvoiddoor driving device configuration

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent integrates the door motor directly into the door header structure, merging the motor housing with the door header assembly. This consolidation eliminates the need for separate mounting brackets and complex positioning mechanisms, thereby reducing device complexity while successfully positioning the motor to avoid ceiling plate interference

Inventive Principle:

Principle #5Merging (Combining)

3Force

If a reduction mechanism with pulleys and belts is used in the door driving device, then torque can be increased, but noise and vibration are generated during door movement

Engineering Contradiction:

Improvetorque for door movementVSAvoidnoise and vibration from reduction mechanism

Core Design Contradiction:

ForceVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the traditional reduction mechanism consisting of multiple pulleys and belts with a direct-drive configuration where the motor shaft is directly coupled to the driving pulley. This substitution eliminates the intermediate transmission elements that generate noise and vibration, while the motor itself provides sufficient torque for door operation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Adaptability or versatility

If the driving shaft of the door motor is not directly supported by the door frame, then the motor can be freely positioned, but vibrations are applied to the door frame during operation

Engineering Contradiction:

Improvemotor positioning flexibilityVSAvoidvibrations applied to door frame

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent incorporates vibration isolation elements into the motor mounting structure in advance, before the motor operates. These pre-installed damping components prepare the mounting system to absorb and attenuate vibrations, allowing the motor to be positioned on the door header while preventing vibration transmission to the door frame during operation

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides a stable and quiet operation of elevator doors by minimizing vibrations and noise, allowing for a more compact motor configuration that does not interfere with the ceiling plate, enhancing the overall efficiency of the door driving mechanism.

Implementation Method 1

a rotating shaft having an axis that is oriented substantially perpendicularly to the vertical portion, a driving pulley, and a driving portion. The rotating shaft is rotatably supported by the vertical portion at one end thereof and is rotatably supported by the housing at the other end thereof

Methodology Applied

Scientific EffectBall Bearing: Ball Bearing

Data Source

PatentUS8727076B2Device for driving a door of an elevator

Publication Date: 2014.05.20 OTIS ELEVATOR CO

AI summary

A device for driving a door of an elevator includes a door header, a door, and a driving motor. The door header, which is mounted on a frame defining a doorway, includes a vertical portion substantially parallel to a plane of the doorway. The door is movably supported on the frame. The driving motor, which is disposed on the vertical portion of the door header, includes a housing fixed with respect to the vertical portion, a rotating shaft having an axis that is oriented substantially perpendicularly to the vertical portion, a driving pulley, and a driving portion. The rotating shaft is rotatably supported by the vertical portion at one end thereof and is rotatably supported by the housing at the other end thereof. The driving pulley is coupled to the rotating shaft. The driving portion drives the rotating shaft.