Power Transmitting Mechanism Assembly Friction Control
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Solution Overview
Problem
Conventional power transmitting mechanisms in lens driving units suffer from low efficiency, durability issues, noise, vibration, and dust generation due to the use of friction forces between rollers and rings, which also lead to increased volume and complexity.
Innovation Solution
A power transmitting mechanism assembly featuring a supporting plate with rotatably attached rollers, a power generating unit, and a friction changing unit made of flexible materials, which adjusts friction coefficients between the rollers and plates to enhance power transmission efficiency, durability, and reduce noise and dust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a roller and a ring are pressed together with strong force to increase friction force, then power transmitting efficiency is improved, but durability of the roller and ring deteriorates, dust is formed, and noise and vibration are generated
Solution Approach 1:
The invention changes the friction coefficient parameter by using an elastic member with specific elastic properties between the roller and the ring. This allows maintaining sufficient friction force for power transmission while reducing excessive pressing force that causes wear and dust generation. The elastic member's material properties and geometric shape are optimized to achieve the desired friction characteristics.
Solution Approach 2:
The elastic member acts as an intermediary element between the roller and the ring. Instead of direct contact between these components, the elastic member mediates the interaction, providing the necessary friction force while cushioning the contact and reducing impact loads that would otherwise cause wear and noise.
2Loss of energy
If a roller and a ring are pressed together with strong force to increase friction force, then power transmitting efficiency is improved, but noise and vibration are generated
Solution Approach 1:
The elastic member provides beforehand cushioning by absorbing and dampening impact forces before they can generate noise and vibration. The elastic properties of the member allow it to deform under load and return energy smoothly, preventing sudden impacts between the roller and ring that would cause audible noise and vibrations.
3Force
If operation force of the power transmitting mechanism is increased to improve power transmission, then power transmitting efficiency is improved, but durability of the roller and ring deteriorates
Solution Approach 1:
The invention optimizes the friction coefficient parameter through the elastic member's material selection and geometric design. This allows achieving the necessary operation force for effective power transmission while preventing excessive forces that would lead to wear and durability issues. The elastic member's compliance helps distribute forces more evenly.
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 solution improves power transmitting efficiency, reduces noise and vibration, and enhances durability by utilizing rollers and plates with varying friction coefficients, minimizing assembly precision challenges and dust formation.
Implementation Method 1
The friction changing unit may be formed of a flexible material and is arranged to partially surround the outer surface of the first roller
Implementation Method 2
A piezoelectric device, which operates based on piezoelectric effect, is widely applied for moving lenses of an optics system
Data Source
AI summary
A power transmitting mechanism assembly including a supporting plate; a first roller, which is rotatably attached to the supporting plate; a first plate, which contacts a first end of the first roller and is arranged to be able to rotate with respect to the supporting plate; a power generating unit, which generates power for rotating the first plate when a signal is applied; a second plate, which is arranged to contact a second end of the first roller; and a friction changing unit, which is attached to at least one of the first roller, the first plate, and the second plate and changes friction of a portion of a contacting surface between the first roller and the first plate or friction of a portion of a contacting surface between the first roller and the second plate.