Segmented Deflection Roller for Elevator Belt Noise Reduction
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Solution Overview
Problem
Elevator systems with multiple parallel suspension elements guided over a deflection roller often experience significant noise due to 'stick-slip' effects and relative movements, which are not adequately addressed by existing solutions, especially when deflection rollers are improperly aligned or wear out.
Innovation Solution
The deflection disks are designed to be slidably and rotatably mounted on the shaft, allowing for rotational mobility in the sliding friction area, using materials like high-strength plastics with low coefficients of friction, and featuring flanges to prevent excessive rubbing and heat buildup, ensuring that relative movements are compensated and not transmitted between disks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple parallel suspension elements are guided over the same deflection roller, then the load capacity is increased, but noise is generated due to stick-slip effects and relative movements
Solution Approach 1:
The deflection roller is segmented into multiple independent deflection pulleys that can rotate relative to each other on the shaft. Each pulley handles a specific suspension element independently, preventing the transmission of vibrations and stick-slip effects between adjacent suspension elements, thus reducing noise while maintaining load capacity.
Solution Approach 2:
The deflection pulleys are designed with rotational mobility on the shaft, allowing them to dynamically adjust and compensate for relative movements between suspension elements. This dynamic capability prevents the buildup of stick-slip effects and reduces noise generation while supporting multiple parallel suspension elements.
2Stability of the object's composition
If deflection pulleys are firmly connected to the shaft, then structural stability is improved, but noise increases due to transmitted vibrations
Solution Approach 1:
The firm connection is segmented into multiple independent mounting points, with each deflection pulley mounted separately on the shaft. This segmentation allows each pulley to isolate vibrations locally while maintaining overall structural stability through the shaft's support.
Solution Approach 2:
The shaft acts as an intermediary element between the fixed support structure and the deflection pulleys. It provides stable support while allowing the pulleys to rotate independently, mediating between the need for structural stability and the need to prevent noise transmission.
3Object-generated harmful factors
If coatings are applied to reduce friction, then noise is reduced initially, but noise increases again over time due to wear and contamination
Solution Approach 1:
The system uses self-lubricating materials for the deflection pulley surfaces that maintain low friction and noise levels throughout their service life without requiring external coatings. The materials inherently resist wear and contamination, providing long-lasting noise reduction without the need for periodic re-coating.
4Ease of manufacture
If standard ball bearings are used for mounting deflection pulleys, then ease of manufacture is improved, but noise reduction effect is insufficient
Solution Approach 1:
The bearing type parameter is changed from standard ball bearings to plain bearings or sleeve bearings. This parameter change provides sufficient noise reduction through sliding friction while maintaining ease of manufacture, as plain bearings are simple in design and easy to install.
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 design effectively reduces noise by compensating for small relative movements and preventing the transmission of vibrations, providing a long-lasting and cost-effective solution with minimal maintenance needs.
Implementation Method 1
The deflection disks (9a, 9b, 9c) are arranged on and relative to the shaft (8) without play, but so that they can be rotated in a sliding manner
Implementation Method 2
small relative movements between the deflection disks (9a, 9b, 9c) of the individual supporting elements (5a, 5b, 5c) running side by side and the shaft (8) of the deflection roller are compensated for
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a deflection roller in a flexible drive, preferably in a lift drive with lift or supporting belts, wherein the deflection roller can be rotatably mounted and comprises several deflection disks mounted on a shaft. The flexible intermediate link, the deflection roller or the deflection disks pass around or are wound around a partial circumference on an outer peripheral surface and the deflection disks are rotatably arranged and mounted so that they can slidingly move with respect to shaft.