Elevator Governor Core Ring Assembly for Rope Tension Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed elevators using car-mounted governors face issues with excessive tensile force on the rope and the safety activating module, particularly at varying heights, leading to stringent requirements for rope design and potential wear, as well as excessive force output during braking.
Innovation Solution
A core ring assembly with axially arranged portions and a pressure generation mechanism, featuring conical contact surfaces and a gap to maintain consistent friction force, reduces the tensile force on the rope and filters out excessive force output to the safety activating module, ensuring consistent tensile force across different heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the governor is actuated at higher heights, then the tensile force on the rope increases, but this leads to excessive force output and potential wear
Solution Approach 1:
The core ring is divided into a first portion and a second portion that can rotate relative to each other. The first portion rotates by receiving actuation torque from the over-speed actuating mechanism, while the second portion rotates with the first portion by virtue of friction of contact surfaces. This segmentation allows the system to decouple the rope tension force from the safety activating module actuation force.
Solution Approach 2:
The core ring assembly acts as an intermediary mechanism between the over-speed actuating mechanism and the safety activating module. It transfers and transforms the actuation torque through friction-based rotation between its two portions, effectively mediating the force transmission and reducing the excessive tensile force that would otherwise be transmitted to the rope.
2Strength
If the rope diameter and weight are increased to handle higher tensile forces, then the rope strength increases, but the system complexity and weight increase
Solution Approach 1:
By segmenting the core ring into two rotatable portions with friction-based coupling, the invention creates a force transformation mechanism that reduces the tensile force demand on the rope regardless of activation height, eliminating the need to increase rope diameter and weight for higher strength capacity.
3Device complexity
If the governor uses a traditional core ring design, then the structure is simple, but excessive force output damages the safety activating module during braking
Solution Approach 1:
The core ring is segmented into two portions that rotate relative to each other through friction contact. This segmentation creates a natural force-limiting mechanism where the friction between contact surfaces controls the torque transmission, preventing excessive force output to the safety activating module during braking while maintaining relatively simple structure.
Solution Approach 2:
The friction between the contact surfaces of the two core ring portions, which could be considered a loss mechanism, is converted into a beneficial force-limiting feature. The friction prevents excessive torque transmission during braking, protecting the safety activating module from damage while maintaining structural simplicity.
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 core ring assembly maintains consistent tensile force on the rope and reduces excessive force output to the safety activating module, alleviating the need for increased rope diameter and weight, thus addressing the contradictions in rope design requirements and preventing wear and impact during braking.
Implementation Method 1
the second portion of the core ring rotates with the first portion of the core ring by virtue of friction of the contact surfaces
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides a core ring assembly for an elevator governor, a governor and an elevator system, wherein the core ring assembly comprises: a first portion and a second portion of a core ring which are axially arranged, the first portion and the second portion of the core ring having contact surfaces therebetween; and a pressure generation mechanism for generating a pressure between the first portion and the second portion of the core ring, wherein the first portion of the core ring rotates by receiving an actuation torque from an over-speed actuating mechanism, and the second portion of the core ring rotates with the first portion of the core ring by virtue of friction of the contact surfaces and enables a safety activating module. The core ring assembly provided by the embodiment of the present invention has a peak torque limiting function and a compact structure.