Elastic Arm Coating for Watch Component Sagging
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Solution Overview
Problem
Components with flexible guidance in watch mechanisms are prone to sagging due to weight and impacts, leading to potential loss of contact with partner components or contact with other parts, which can damage the movement, and increasing the size of elastic arms is not always feasible due to space constraints.
Innovation Solution
A micromechanical component with flexible guidance featuring elastic arms with a core and a coating made of a material with a higher modulus of elasticity than the core, where the coating is only applied to faces perpendicular to the determined plane, maintaining low rigidity in that plane while increasing rigidity perpendicular to it, thus enhancing mechanical resistance without increasing component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the size of elastic arms is increased parallel to the virtual axis of rotation to prevent sagging, then the mechanical resistance and stability are improved, but the component size increases which is not always feasible given space constraints
Solution Approach 1:
The patent applies a coating with different mechanical properties to specific regions of the elastic arm. The coating is applied only on faces parallel to the determined plane, creating local variation in rigidity. This allows the elastic arms to have high rigidity where needed (parallel to the plane) while maintaining flexibility in other directions, preventing sagging without increasing overall component size.
Solution Approach 2:
The patent uses a composite structure consisting of a core material and a coating material with different moduli of elasticity. The core provides the base elastic properties while the coating layer (made of materials like diamond, carbide, ceramic, or metal with higher modulus of elasticity) enhances rigidity in specific directions. This composite approach allows optimization of mechanical resistance without proportionally increasing volume.
2Ease of operation
If the elastic arms are made thinner in the plane perpendicular to the virtual axis of rotation to enable flexibility, then the pivoting function is improved, but the rigidity parallel to the virtual axis of rotation decreases leading to sagging under weight and impacts
Solution Approach 1:
The coating is applied selectively only on certain faces of the elastic arm core, creating anisotropic mechanical properties. The faces parallel to the determined plane receive the coating to enhance rigidity, while other faces remain uncoated to maintain flexibility. This local differentiation resolves the contradiction between needing flexibility for pivoting and rigidity to prevent sagging.
Solution Approach 2:
The patent changes the physical parameters of the elastic arm by adding a coating layer with different material properties (higher modulus of elasticity). This modifies the effective rigidity parameters in specific directions without changing the overall geometry or volume of the component, allowing the arms to be thin enough for flexibility while maintaining sufficient rigidity through material property modification.
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 configuration allows the elastic arms to maintain their functionality while providing high rigidity perpendicular to the plane, preventing sagging and contact issues, and can be manufactured using materials like diamond, carbide, or ceramic coatings on metal or silicon cores, ensuring the component operates without tilting or deforming excessively.
Implementation Method 1
at least one of the elastic arms comprises a core and a coating made of a material having a modulus of elasticity greater than the material in which the core is made
Data Source
Figure 1~3
Figure 4~6
Figure 7~9
AI summary
The flexible-guided micromechanical or watchmaking component according to the invention comprises first and second rigid parts (2, 3) connected by a system of elastic arms (7, 8) arranged to guide the movement of the second rigid part (3) relative to the first rigid part (2) in a predetermined plane. At least one of the elastic arms (7, 8) comprises a core (25) and a coating (26) made of a material having a modulus of elasticity greater than that of the material of which the core is made. The core (25) carries the coating (26) only on its two faces (27, 28), or on one of its two faces (27, 28), which are parallel to the predetermined plane.