Elastic Output Shaft Coupling for Robot Servo Shock Absorption
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Solution Overview
Problem
Existing robot output shaft structures, where the power output mechanism and driven member are rigidly connected, lead to frequent damage of servos, especially in large humanoid robots, resulting in reduced reliability and increased maintenance costs due to gravitational forces applied to arms and legs.
Innovation Solution
An output shaft component comprising a housing, an adapter shaft, and an elastic body with an inner and outer ring connected by an elastic portion, allowing for rotational synchronization and cushioning effects to absorb external forces, thereby reducing damage to the power output mechanism and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the power output mechanism and driven member are rigidly connected, then the structural strength and stability are improved, but the reliability deteriorates due to frequent servo damage from external forces
Solution Approach 1:
The patent introduces an elastic body as an intermediary component between the power output mechanism and the driven member. This elastic body absorbs external forces and shocks, preventing them from directly transmitting to the servo. The intermediary element maintains the beneficial rigid connection for strength while protecting against harmful force transmission, thereby improving reliability without sacrificing structural integrity.
2Device complexity
If a rigid connection is used between power output mechanism and driven member, then the device complexity is reduced, but the reliability deteriorates due to servo damage from gravitational forces
Solution Approach 1:
The elastic body serves as a simple intermediary component that adds minimal structural complexity while providing significant protective function. It absorbs gravitational forces and external shocks before they reach the servo, preventing frequent damage. The addition of this single elastic component resolves the reliability issue without substantially increasing device complexity.
3Manufacturing precision
If the power output mechanism and driven member are directly connected, then the manufacturing precision requirements are reduced, but the reliability deteriorates due to frequent servo damage
Solution Approach 1:
The elastic body acts as a buffer that compensates for minor misalignments and variations in manufacturing tolerances between the power output mechanism and driven member. By absorbing external forces and providing a compliant connection, it reduces the stringency of manufacturing precision requirements while simultaneously improving reliability by protecting the servo from damage.
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 effectively reduces damage to the power output mechanism, enhances the robot's reliability, and decreases maintenance costs by providing a cushioning effect that absorbs external forces, ensuring the power output mechanism is protected and the robot's performance is maintained.
Implementation Method 1
the elastic portion 33 connected between the inner ring 31 and the outer ring 32... an elastic deformation occurs in the elastic portion 33
Data Source
AI summary
The present disclosure provides an output shaft component and a power output mechanism. The output shaft component includes a housing connected to the driven member, an adapter shaft connected to an output shaft of the power output mechanism, and an elastic body mounted in the housing. The adapter shaft is rotatably mounted in the housing. The elastic body includes an inner ring, an outer ring located outside the inner ring, and an elastic portion connected between the inner ring and the outer ring. The adapter shaft is sheathed in the inner ring, the inner ring is synchronously rotatably connected to the adapter shaft, and the outer ring is fixed on the housing.