Elevator Suspension Decoupling Guide Roller Load
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Solution Overview
Problem
Conventional elevator systems experience uneven force and moment distribution on guide rollers due to the weight of connecting means, leading to increased stress and reduced driving comfort, especially at extreme positions within the elevator shaft.
Innovation Solution
An additional cable is attached to the suspension system, counteracting the weight force of the connecting means, ensuring force equilibrium and decoupling the connecting means from the elevator car, thereby eliminating torque and uneven loads on guide rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a connecting element is attached to the underside of the elevator car, then the car can be connected to the counterweight or shaft, but uneven loads are generated on the guide rollers
Solution Approach 1:
A suspension device is introduced as an intermediary between the connecting element and the elevator car. The suspension device includes a suspension point that is at least partially decoupled from the car, allowing the connecting element to be attached without directly loading the guide rollers. This mediator transfers the connection function while isolating the harmful force effects from the guide rollers.
2Volume of moving object
If the connecting element acts in a decentralized manner, then space constraints are accommodated, but uneven force and moment distribution occurs on the guide rollers
Solution Approach 1:
The suspension device acts as a mediator that decouples the decentralized attachment point from the guide rollers. The suspension point can be positioned anywhere on the car (accommodating space constraints) while the suspension mechanism ensures that this decentralized position does not create uneven forces on the guide rollers.
Solution Approach 2:
The connection system is segmented into distinct functional parts: the connecting element, the suspension device, and the car body. This segmentation allows the connecting element to be positioned decentralizedly for space reasons while the suspension device handles the force distribution, separating the spatial arrangement from the force transmission.
3Force
If a balancing mass is used to compensate for uneven force distribution, then torque on guide rollers is reduced in specific positions, but forces remain uneven in other positions
Solution Approach 1:
The suspension device serves as a universal mediator that continuously balances forces at all car positions, unlike a fixed balancing mass that only works optimally at one position. The suspension point's decoupling mechanism adapts to any car position, providing continuous force equilibrium throughout the shaft travel.
Solution Approach 2:
The suspension device provides dynamic force balancing that adapts to the car's position in the shaft. As the car moves, the suspension mechanism continuously adjusts to maintain even force distribution on the guide rollers, whereas a static balancing mass can only optimize for a specific position.
4Device complexity
If the first end of the connecting element is attached directly to the car, then the connection is simple, but the weight of the connecting element creates undesirable forces on guide rollers
Solution Approach 1:
The suspension device is introduced as a minimal-complexity intermediary that attaches to the car and provides the suspension point for the connecting element. This adds only one additional component while completely eliminating the harmful forces on the guide rollers, representing a small complexity increase for significant force reduction.
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 solution provides optimal balancing of the elevator car at all positions, extending the service life of guide rollers, reducing maintenance costs, and enhancing driving characteristics and comfort by maintaining even loads on guide rollers.
Implementation Method 1
an additional rope (40), wherein the additional rope (40) is attached to the suspension (50) in such a way that a force acts on the suspension (50) to counteract a weight force of the connecting element (11)
Implementation Method 2
a force acts on the suspension (50) to counteract a weight force of the connecting element (11)
Data Source
Figure 1a
Figure 1
Figure 2
AI summary
An example elevator system may include at least one elevator cage that is displaceable in an elevator shaft, a connection means that has a first elevator cage-side end and a second end, and a suspension disposed on the elevator cage. The connection means may include, for instance, a balance chain or belt. The first end of the connection means may be fastened to the suspension on the elevator cage. Further, the example elevator system may include a support unit that exerts a force on the suspension that counteracts a force acting on the suspension due to a mass of the connection means. The support unit may include a rope, a deflection roller, and a counterweight, wherein the rope is fastened to the counterweight and the suspension and is guided over the deflection roller.