Adjustable Gear Clearance Mechanism for Robot Arm Transmission
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Solution Overview
Problem
Commonly-used gear transmission mechanisms in robot arms experience increased gear clearance due to wear over time, leading to collisions, noise, decreased transmission power, and reduced positional precision, especially in gear pairs that rotate consistently.
Innovation Solution
The proposed solution includes a gear transmission mechanism with a housing, first and second transmission assemblies, and two gear clearance adjustment assemblies. The adjustment assemblies, comprising an adjustment base, fasteners, bearings, an adjusting gear, washer, and fixing member, allow for adjustable gear clearances by positioning adjustment bases relative to the transmission gears, minimizing excessive clearance and preventing gear collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gear clearance is increased to prevent seizing, then reliability is improved, but manufacturing precision deteriorates due to wear causing excessive clearance
Solution Approach 1:
The patent applies the dynamics principle by making the gear clearance adjustable rather than fixed. The adjustment assembly allows the gear clearance to be dynamically modified based on wear conditions, enabling the system to adapt to changing states. This resolves the contradiction by allowing initial larger clearance for reliability while permitting precision maintenance through adjustment.
Solution Approach 2:
The patent implements parameter changes by providing a mechanism to alter the gear clearance parameter over time. The adjustment assembly enables changing the clearance parameter from an initial value to a adjusted value, allowing the system to optimize performance at different stages of operation and counteract wear-induced precision loss.
2Manufacturing precision
If gear clearance is maintained small for precision, then manufacturing precision is improved, but reliability deteriorates due to gear seizing
Solution Approach 1:
The adjustment assembly enables dynamic modification of gear clearance, allowing the system to start with small clearance for precision and increase it as needed to prevent seizing. This dynamic capability resolves the contradiction by allowing the clearance to evolve from precision-optimized to reliability-optimized states.
Solution Approach 2:
The patent incorporates preliminary action by providing an adjustable mechanism that can preemptively increase gear clearance before seizing occurs. The adjustment assembly allows operators to detect wear trends and proactively modify clearance parameters, preventing the harmful effect of gear seizing before it happens.
3Reliability
If gear clearance increases due to wear, then reliability is improved against seizing, but transmission precision deteriorates due to collisions and noise
Solution Approach 1:
The patent applies parameter changes by enabling modification of the gear clearance parameter to counteract wear-induced precision loss. The adjustment assembly allows recalibration of clearance to maintain optimal transmission precision while preserving the reliability benefits of adequate clearance.
Solution Approach 2:
The adjustment assembly implements feedback by allowing operators to observe transmission quality (collisions, noise, positional precision) and相应 adjust gear clearance. This feedback loop enables maintaining optimal precision by compensating for wear effects through periodic adjustment.
4Device complexity
If gear clearance is fixed during assembly, then device complexity is reduced, but adaptability deteriorates due to inability to compensate for wear
Solution Approach 1:
The patent applies dynamics by transforming the fixed gear clearance into an adjustable one. The adjustment assembly adds minimal structural elements (adjustment base, fasteners, bearings, adjusting gear) that enable dynamic modification without significantly increasing overall system complexity, thereby improving adaptability to wear conditions.
Solution Approach 2:
The patent implements segmentation by separating the gear clearance adjustment function into a distinct adjustment assembly. This modular approach allows the adjustment mechanism to be added as a separate functional unit, minimizing the impact on overall system complexity while maximizing adaptability benefits.
Data Source
AI summary
A gear transmission mechanism includes a housing, a first transmission assembly, a second transmission assembly, and a gear clearance adjustment assembly. The first transmission assembly includes an input shaft, and the second transmission assembly includes an output shaft. The gear clearance adjustment assembly includes an adjustment base mounted on the housing, fasteners, bearings, a washer, a fixing member, and a pair of freely rotatable adjusting gears for the transmission of rotative force. The adjusting gears mesh with the first and second transmission gears.