Pulley Structure With Inner-Surface Grease for Spring Rust Inhibition
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Solution Overview
Problem
The existing pulley structure design faces challenges in effectively diffusing grease containing a rust inhibitor across the entire spring accommodation space due to a small heat-transfer area and viscosity issues, leading to incomplete rust inhibition and reduced lifespan.
Innovation Solution
Applying a grease with a rust inhibitor to the facing surface of the inner rotating body, ensuring a larger contact area and facilitating heat transfer, which allows the grease to spread radially due to centrifugal force during operation, ensuring comprehensive rust inhibition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grease is put into the spring accommodation space in a lump state, then the labor is reduced and the use amount of rust inhibitor is minimized, but the heat-transfer area is small and the viscosity is less likely to decrease, making it difficult to diffuse the grease to every corner
Solution Approach 1:
The grease is preliminarily applied to the facing surface of the inner rotating body before assembly, ensuring proper positioning and heat transfer contact. This preliminary action allows the grease to be in optimal position before the pulley structure is assembled, resolving the contradiction by maintaining both labor efficiency and rust inhibition effectiveness
Solution Approach 2:
The facing surface of the inner rotating body serves as an intermediary medium that facilitates heat transfer to the grease. By applying grease to this surface, the system creates an effective heat transfer pathway that enables viscosity reduction and diffusion without requiring manual application to every surface, thus maintaining both productivity and reliability
2Reliability
If grease is applied to the facing surface of the inner rotating body, then the contact area increases and heat transfer is facilitated, but the application process becomes more complex
Solution Approach 1:
The inner rotating body's facing surface serves as a self-service platform for grease application. During normal operation, the rotation of the inner rotating body automatically distributes the grease throughout the spring accommodation space, eliminating the need for complex external application mechanisms while ensuring reliable rust inhibitor diffusion
Solution Approach 2:
The grease application leverages parameter changes in temperature and rotational speed during operation. As the pulley structure operates, temperature increases and viscosity decreases, while rotational speed generates centrifugal force. These parameter changes automatically facilitate grease diffusion across the facing surface, achieving reliable rust inhibition without complex application processes
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 approach enhances the diffusion of the rust inhibitor across the spring accommodation space, effectively preventing rust and maintaining the pulley structure's functionality and longevity while reducing labor and production inefficiencies.
Implementation Method 1
the centrifugal force due to the rotation of the inner rotating body acts on the grease, and thus the grease is also likely to be diffused radially outward
Implementation Method 2
heat of the inner rotating body is likely to be transferred to the grease during the operation test of the accessory machine and the like, the temperature of the grease is likely to be raised
Data Source
AI summary
A pulley structure may include: a tubular outer rotating body having a belt looped thereon; an inner rotating body which is disposed radially inside the outer rotating body and which is rotatable relative to the outer rotating body; and a torsional coil spring which is arranged in a spring accommodating space formed between the outer rotating body and the inner rotating body. At least in a state in which the pulley structure has not been operated even once, grease containing a rust inhibitor is applied to an opposing surface of the inner rotating body opposing an inner peripheral surface of the torsional coil spring.