Servo External Spline Output Shaft Strength
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Solution Overview
Problem
Existing servos suffer from strength weaknesses, structural instability, and reduced precision due to internal spline wear and lack of additional bearing stages, leading to potential destruction and vibration issues during torque output.
Innovation Solution
A servo design featuring a power input apparatus, first-stage and second-stage deceleration mechanisms, and an external spline output shaft with an integrated bearing, allowing for compact structure, increased strength, and enhanced deceleration effects through the use of a planetary gear set and output bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If internal splines are used to connect the power output shaft and external components, then the structure is compact, but the strength is reduced and the splines are prone to wear and destruction
Solution Approach 1:
The patent inverts the traditional internal spline configuration by using external splines on the power output shaft instead. This inversion allows the splines to be located on the outer surface of the shaft, increasing their contact area and load-bearing capacity, thereby resolving the contradiction between compact structure and connection strength.
2Device complexity
If internal splines are used for power transmission, then the structure is simplified, but the precision of angle output is affected due to vibration
Solution Approach 1:
By inverting the spline configuration from internal to external, the patent achieves better vibration characteristics. The external splines provide more stable power transmission with reduced vibration, thereby improving angle output precision while maintaining structural simplicity.
3Volume of moving object
If the power output shaft is disposed inside the steering box, then the structure is compact, but it is not easy to connect to external gears for additional deceleration
Solution Approach 1:
The patent inverts the power output shaft configuration from an internal to an external position. This allows the shaft to extend outward with external splines, making it much easier to connect to external gears and other components, thereby significantly improving connection versatility while maintaining a compact overall structure.
4Device complexity
If no additional bearing stage is added, then the structure is simple, but the output shaft and steering box are unstable and prone to vibration
Solution Approach 1:
The patent introduces an additional bearing stage as an intermediary component between the power output shaft and the steering box. This bearing acts as a mediator that supports the shaft, reduces vibration, and improves stability, while the overall structure remains relatively simple.
Data Source
AI summary
A servo and a robot with the servo are provided. The servo comprises a power input apparatus with a first output shaft, a deceleration apparatus, and a power output mechanism. The deceleration apparatus comprises a first-stage deceleration mechanism and a second-stage deceleration mechanism. The power output mechanism comprises a second output shaft and an output bearing fixedly installed on the second output shaft, wherein the second output shaft is an external spline output shaft. Through the external spline output shaft and the output bearing disposed on the power output mechanism, the servo could directly connect with an exterior component through the external spline output shaft, and the strength is improved. As a result, the friction between the servo and the exterior component is reduced, and the lifetime is therefore increased.