Biased Pin Gear Connection for Quiet Torque Transmission
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Solution Overview
Problem
Existing gear connection structures face challenges in efficiently transmitting rotational force due to micro movements of the parallel pin, which can lead to inefficient power transmission and noise issues.
Innovation Solution
A gear connection structure that includes a rotary shaft, a parallel pin, a gear, and a biasing member. The biasing member presses the parallel pin against the gear's contacting wall and the inner periphery of the pin hole, preventing micro movements and ensuring efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projections are provided on the groove to press the parallel pin against the contacting wall, then the parallel pin is held firmly, but the structure complexity increases
Solution Approach 1:
The biasing member is extracted as a separate functional component from the groove structure. Instead of integrating the pressing function into the groove walls themselves, a dedicated biasing member (such as a spring or elastic element) is introduced to provide the necessary pressing force, thereby simplifying the overall structural design while maintaining reliable pin holding
Solution Approach 2:
The biasing member is pre-installed in the groove to continuously apply pressing force to the parallel pin before any micro-movements occur. This preliminary action ensures that the pin is constantly pressed against the contacting wall, preventing oscillation and micro-movements without requiring complex active control mechanisms
2Productivity
If the parallel pin is tightly pressed against the contacting wall to suppress micro movements, then power transmission efficiency improves, but the friction and wear increase
Solution Approach 1:
The biasing member is designed to apply an optimized pressing force that is sufficient to eliminate micro-movements and ensure efficient power transmission, but not excessive to cause damaging friction and wear. This parameter optimization balances the conflicting requirements of transmission efficiency and component longevity
Solution Approach 2:
The biasing member acts as a cushioning element that absorbs and distributes the contact forces between the parallel pin and the groove walls. By providing this beforehand cushioning, the peak forces and impact loads are reduced, thereby minimizing friction and wear while still maintaining firm contact for efficient power transmission
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 proposed solution effectively suppresses micro movements of the parallel pin, ensuring efficient transmission of rotational force and reducing noise, thereby enhancing the overall performance of the gear connection structure.
Implementation Method 1
The biasing member biases the parallel pin placed inside the pin groove from a separate wall being one of a pair of walls of the pin groove toward a contacting wall
Data Source
AI summary
A gear connection structure included in a drive device of a document conveyance device includes: a rotary shaft extending in an axial direction thereof; a parallel pin inserted through a pin hole formed in the rotary shaft, the pin hole passing through the rotary shaft in a radial direction thereof orthogonal to the axial direction; a gear; and a biasing member. The gear includes: a shaft hole through which the rotary shaft is passed; and a pin groove inside which the parallel pin is placed. The biasing member biases the parallel pin placed inside the pin groove from a separate wall being one of a pair of walls of the pin groove toward a contacting wall being the other of the pair of walls to press the parallel pin against the contacting wall and against a side of an inner periphery of the pin hole close to the contacting wall.