Pulley Structure for Heat-Driven Grease Diffusion and Rust Prevention
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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, leading to reduced viscosity and incomplete coverage, which can result in reduced clutch mechanism functionality and shortened lifespan.
Innovation Solution
Applying the grease to the facing surface of the inner rotating body, which increases the contact area and facilitates heat transfer, allowing the grease to spread radially outward due to centrifugal force, ensuring thorough diffusion across the spring accommodation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If grease is simply put into the spring accommodation space in a lump state, then the amount of rust inhibitor used is minimized and labor is reduced, but the heat-transfer area is small causing insufficient heat transfer to the grease
Solution Approach 1:
The grease is preliminarily applied to the facing surface of the inner rotating body before assembly, ensuring optimal heat transfer contact area is established in advance. This preliminary positioning allows the grease to receive heat efficiently from the rotating body during operation, resolving the contradiction between ease of application and heat transfer effectiveness.
2Productivity
If grease is simply put into the spring accommodation space in a lump state, then labor is reduced, but the viscosity of the grease is less likely to decrease due to insufficient heat transfer
Solution Approach 1:
The grease is preliminarily applied to the facing surface of the inner rotating body in a controlled manner, ensuring optimal contact area is established before assembly. This preliminary positioning ensures that during operation, the grease receives sufficient heat to reduce viscosity and diffuse properly, while maintaining high assembly efficiency.
3Reliability
If grease is applied to the facing surface of the inner rotating body, then heat transfer area is increased facilitating grease diffusion, but the complexity of the manufacturing process increases
Solution Approach 1:
The inner rotating body serves dual purposes: it is both a structural component and a grease application surface. By utilizing the existing facing surface of the inner rotating body for grease application, the system leverages its own structure to achieve effective grease distribution without requiring additional complex manufacturing equipment or processes.
4Reliability
If grease is applied to the facing surface of the inner rotating body, then the rust inhibitor can be diffused across the entire region, but the amount of grease required increases
Solution Approach 1:
The grease is applied specifically to the facing surface of the inner rotating body, which is the local area that requires rust protection and heat transfer. This localized application ensures that grease is concentrated where it is most needed, achieving effective rust prevention and diffusion without unnecessary grease consumption in other areas.
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 ensures efficient diffusion of the rust inhibitor across the entire region, maintaining the clutch mechanism's functionality and extending the pulley structure's lifespan by preventing rust formation and maintaining bearing performance.
Implementation Method 1
heat of the inner rotating body is likely to be transferred to the grease, the temperature of the grease is likely to be raised
Implementation Method 2
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
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3~4
AI summary
The present invention provides a pulley structure (10) provided with: a tubular outer rotating body (2) having a belt (B) looped thereon; an inner rotating body (3) which is disposed radially inside the outer rotating body (2) and which is rotatable relative to the outer rotating body (2); and a torsional coil spring (4) which is arranged in a spring accommodating space (8) formed between the outer rotating body (2) and the inner rotating body (3). At least in a state in which the pulley structure (10) has not been operated even once, a grease (200) containing an antirust agent is applied to an opposing surface (34) of the inner rotating body 3 opposing an inner peripheral surface (42) of the torsional coil spring (4).