Amorphous Metal Escapement System for Timepiece Energy Efficiency
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Solution Overview
Problem
The existing escapement systems in watchmaking suffer from low performance due to friction, energy dissipation, and limited elastic deformation capacity of crystalline metal components, leading to significant energy losses and reduced power reserve in timepieces.
Innovation Solution
The use of amorphous metal alloys for the escapement system, which offers higher elastic limits and improved energy restitution factors, along with simplified manufacturing processes, allows for the production of parts with complex shapes and reduced mass, minimizing friction and energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If crystalline metal components (15P or 20AP steel) are used in the escapement system, then good machinability and very good mechanical properties are achieved, but the elastic limit is low leading to significant energy losses
Solution Approach 1:
The patent changes the fundamental material parameter from crystalline to amorphous structure. This transforms the material's elastic limit and energy storage capacity without sacrificing machinability, as amorphous metals can be shaped before crystallization. The amorphous structure provides superior elastic properties (σe/E ratio) while maintaining manufacturing feasibility through controlled cooling processes.
Solution Approach 2:
The invention employs amorphous metal alloys representing a distinct material class with composite-like properties combining high elastic limit, non-magnetic characteristics, and good formability. These amorphous materials integrate multiple desirable traits that were previously mutually exclusive in traditional crystalline watchmaking materials.
2Quantity of substance
If denser crystalline metals are used to increase moment of inertia and kinetic energy, then energy storage capacity increases, but energy losses during shocks increase due to low elastic limit
Solution Approach 1:
The patent changes the material's elastic parameters by transitioning to amorphous structure. This allows achieving the same or greater energy storage capacity with reduced mass, or alternatively maintaining mass while dramatically reducing energy losses through the superior elastic limit of amorphous metals.
3Strength
If traditional quenched-tempered carbon, sulfur and lead steels are used, then good mechanical properties are achieved, but magnetic interference occurs
Solution Approach 1:
The patent changes the material composition and structure to amorphous metal alloys that are inherently non-magnetic. This eliminates magnetic interference while preserving or enhancing mechanical properties through the amorphous structure's superior strength-to-weight ratio and elastic characteristics.
4Loss of energy
If amorphous metal alloys are used to increase elastic limit and reduce mass, then energy restitution is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent changes the material state from crystalline to amorphous during manufacturing. By controlling cooling rates and processing parameters, the material can be shaped in its formable state before crystallization, combining the advantages of both ductile forming and superior final mechanical properties.
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 amorphous metal escapement system enhances energy restitution, reduces material density, and simplifies production, resulting in improved efficiency and precision, while maintaining mechanical strength and avoiding magnetic interference.
Implementation Method 1
the operation of the escapement system involves friction, undergoes shocks and the dissipation of energy in the constituent materials of the wheel and of the lever in particular... the higher this ratio, the higher the elastic deformation limit of the material... Since the maximum energy that can be stored elastically is calculated as being the ratio between the square of the elastic limit σ e on the one hand and the Young's modulus E on the other hand
Data Source
Figure 1~2
AI summary
The invention relates to an escapement system (1). This system comprises a pallet (7) equipped with a fork intended to collaborate with a pin mounted on a plate (5), and with a rod comprising arms intended to accept pallet stones (21) so as to collaborate with at least one escapement wheel (23). Part of the escapement system is made of an at least partially amorphous metal alloy.