Skewed Elevator Suspension for Torque Cancellation
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Solution Overview
Problem
Prior-art elevators experience undesirable torques in the elevator car frame due to angled suspension means, leading to uneven wearing of guide shoes and noise transmission, as each suspension point produces a local torque with its vertical force component, resulting in unnecessary horizontal force pairs on the guide shoes.
Innovation Solution
The elevator car frame is supported by a skewed suspension means with suspension points positioned on opposite sides of the line between diverting pulleys, allowing torsion force components to cancel out as internal stresses, reducing asymmetric torsion and guide shoe loading, and incorporating deformable members for vibration damping and relative movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the suspension means is disposed at an angle to cross the line between guide rails, then the freedom for placement of the traction sheave and machinery is increased, but undesirable torques are produced in the frame of the car
Solution Approach 1:
The suspension means is deliberately disposed at an angle to the line between guide rails, creating an asymmetric configuration that allows the traction sheave to be placed closer to the wall while maintaining structural integrity. This asymmetric arrangement increases placement freedom while the symmetric positioning of suspension points relative to the diverting pulleys compensates for torque generation.
Solution Approach 2:
The invention converts the potentially harmful torque generated by angled suspension into a beneficial configuration by positioning suspension points symmetrically relative to the diverting pulleys. The torque is transformed into internal stress that strengthens the support structure, while the overall system geometry maintains proper alignment and reduces harmful effects on guide shoes.
2Stability of the object's composition
If the suspension points are positioned at a distance from the guide rail line, then the centricity of the suspension is increased, but horizontal force pairs are formed loading the guide shoes
Solution Approach 1:
The suspension points are positioned at specific locations that are symmetrically arranged relative to the diverting pulleys, creating local symmetry in the force distribution. This localized symmetric arrangement ensures that while the suspension means crosses the guide rail line at an angle, the force components are balanced and do not create problematic horizontal force pairs on the guide shoes.
Solution Approach 2:
The symmetric positioning of suspension points creates counterbalancing force components that offset each other. The horizontal force components generated by each suspension point act in opposite directions and cancel out, preventing net horizontal loading on the guide shoes while maintaining proper centricity.
3Strength
If the suspension means is rigid, then the structural strength is increased, but vibration and noise are transmitted to the car
Solution Approach 1:
A damping element is introduced as an intermediary component between the rigid suspension means and the car frame. This mediator absorbs and dissipates vibration and noise energy, preventing the transmission of harmful vibrations from the strong rigid suspension structure to the car, while the rigid suspension maintains its structural strength for load-bearing.
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
This configuration minimizes torsion and guide shoe forces, enhancing ride comfort and reducing wear, while maintaining centricity and balance, thus providing a more even and reduced load on the guide shoes.
Implementation Method 1
incorporating deformable members for vibration damping and relative movement
Data Source
Figure 1
Figure 2a~2c
Figure 3~4
AI summary
Elevator, which comprises an elevator car (1), which comprises a frame (F) and an inside space; and a first and a second car guide rail (2,3), which are on a first and second side of the elevator car (1), said sides being opposite, and controlled by which car guide rails the elevator car (1) is arranged to move; and a rigid suspension means (4, 4 ', 4 ' ', 4 ' ' ' ), on which the frame of the elevator car is mounted; and a first and a second diverting pulley, which are mounted in a manner that allows rotation on said suspension means (4, 4 ', 4 ' ', 4 ' ' ' ); hoisting roping (7), supported by which the elevator car (1) is suspended; and in which elevator said hoisting roping (7) passes under said first and second diverting pulley; and which suspension means (4, 4 ', 4 ' ', 4 ' ' ' ) crosses the line (BG) between the guide rails (2,3); and which first and second diverting pulley are mounted on the suspension means (4, 4 ', 4 ' ', 4 ' ' ' ) such that they are disposed on a first side (A) and a second side (B), said sides being opposite, of the line (BG) between the guide rails. The frame (F) of the elevator car (1) is mounted on a suspension means (4, 4 ', 4 ' ', 4 ' ' ' ) for being supported by the first suspension point and the second suspension point comprised in the suspension means, which first suspension point and second suspension point are at a horizontal distance from each other and on opposite sides to each other of a line between the first and second diverting pulley; and that said first and second suspension point are on a line between the guide rails (2, 3) or on a line parallel with it.