Watch Escapement Lubrication with PTFE Grease
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Solution Overview
Problem
The lubrication of escapement mechanisms in mechanical watches, particularly those with silicon components, faces challenges due to the fragility of silicon parts and the complexity of applying traditional lubrication methods, which results in increased manufacturing costs and reduced performance reliability.
Innovation Solution
A lubrication process using a grease with PTFE particles dispersed in a PFPE base oil, applied without an epilame, which provides a consistent NLGI grade 2-3 consistency, effectively lubricating silicon or nickel-based escapement mechanisms, improving efficiency and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional lubrication methods with epilaminate are used for silicon escapement components, then lubrication effectiveness is improved, but manufacturing complexity and costs increase due to the fragility of silicon parts
Solution Approach 1:
The patent changes the physical-chemical parameters of the lubricant by using a grease with specific consistency (NLGI grade 2-3) and PTFE particle content (10-55% by mass), which allows effective lubrication without requiring the complex epilaminate process that is particularly problematic for fragile silicon components
Solution Approach 2:
The patent uses a composite lubricant formulation combining grease base oil with dispersed PTFE particles, creating a material that provides both lubrication and protective properties in a single application, eliminating the need for separate epilaminate treatment steps
2Reliability
If beveled teeth are created on escape wheel to form lubricant reservoir, then lubrication is improved, but manufacturing costs and complexity increase
Solution Approach 1:
The patent changes the lubricant viscosity parameters (NLGI grade 2-3 consistency) to achieve optimal retention in the contact area without requiring geometric modifications like beveled teeth, thereby simplifying manufacturing while maintaining lubrication effectiveness
3Loss of energy
If silicon parts are used for anchor and escape wheel, then friction coefficient is reduced, but manufacturing difficulty increases due to fragility and deburring challenges
Solution Approach 1:
The patent uses a composite lubricant with PTFE particles that complements the low-friction properties of silicon, providing enhanced lubrication protection for the fragile silicon components during operation without affecting the manufacturing process
Solution Approach 2:
The patent optimizes the lubricant parameters (grease consistency, PTFE content) to provide adequate protection and lubrication for silicon components, addressing their specific operational requirements without requiring changes to the manufacturing process
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 significantly enhances the amplitude and efficiency of watch escapements by up to 25° and 9 points respectively, while eliminating the need for beveled teeth and epilame application, thereby reducing manufacturing complexity and costs.
Implementation Method 1
A lubrication process using a grease with PTFE particles dispersed in a PFPE base oil, applied without an epilame, which provides a consistent NLGI grade 2-3 consistency, effectively lubricating silicon or nickel-based escapement mechanisms
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3c
AI summary
The invention relates to a method for lubricating a watch escapement mechanism comprising a moving part intended to receive a driving force and a stopping member intended to cooperate with the moving part to alternately block or allow its rotation, said moving part and said stopping member having first and second contact members respectively intended to cooperate with each other. According to the invention, the method is characterized in that it comprises a step of applying a grease comprising PTFE-type particles dispersed in a base oil, the PTFE charge being adjusted with respect to the specific surface area of the particles so as to obtain a grease having a grade between 3 and 1, preferably a grade 3 or 2 according to the NLGI (National Lubricating Grease Institute) scale.