Windmill Pitch Driving Apparatus Fixing Mechanism
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Solution Overview
Problem
Windmill pitch driving apparatuses face issues with vibrations, backlash, and reduced durability due to insufficient lubrication and pinion displacement, leading to decreased efficiency and increased wear in spline coupling portions.
Innovation Solution
A windmill pitch driving apparatus with an eccentric speed reducer configuration, featuring a fixing mechanism that includes a pressure-applying fixing portion to constrain the pinion to the output shaft, and a pinion-side lubricating oil sealing mechanism to prevent lubrication leakage, ensuring proper alignment and lubrication within the spline coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pinion movement in the axial direction of the output shaft is regulated by a plate member fixed to the end of the output shaft, then the device configuration is simplified, but vibrations and backlash occur between the pinion and output shaft, reducing durability and driving efficiency
Solution Approach 1:
The invention replaces the static plate member regulation with a dynamic spring-based positioning mechanism. The positioning member is elastically supported by a spring, allowing it to dynamically adapt to variations in pinion position and maintain consistent contact pressure, thereby eliminating vibrations and backlash while preserving structural simplicity
Solution Approach 2:
The invention introduces a positioning member as an intermediary element between the pinion and the fixed plate member. This positioning member, supported by a spring, acts as a mediator that absorbs axial displacements and maintains stable engagement between the pinion and output shaft, preventing direct vibration transmission
2Power
If a high speed reduction ratio is achieved using an eccentric speed reducer configuration, then output torque is improved and device size is reduced, but the pinion experiences displacement relative to the output shaft causing vibrations and potential damage
Solution Approach 1:
The spring-supported positioning member dynamically compensates for axial displacements of the pinion that occur during high-torque operation. The elastic support allows the positioning member to maintain constant contact with the pinion, absorbing displacement variations and preventing vibration-induced damage while enabling the eccentric speed reducer to deliver high output torque
3Ease of manufacture
If the pinion is loosely positioned on the output shaft, then assembly is easier and device complexity is reduced, but lubrication in the spline coupling portion is not ensured, causing fretting wear and reduced durability
Solution Approach 1:
The spring is pre-compressed during assembly to establish initial contact pressure between the positioning member and the pinion. This preliminary action ensures that lubrication is immediately ensured in the spline coupling portion from the start of operation, preventing fretting wear while maintaining simple assembly procedures
Solution Approach 2:
The positioning member supported by the spring acts as an intermediary that ensures proper positioning and lubrication in the spline coupling portion. The spring mechanism maintains consistent contact pressure, ensuring lubrication effectiveness without complicating the assembly process
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 enhances durability and efficiency by minimizing vibrations and backlash, improving output torque, and extending the lifespan of the apparatus through effective lubrication and alignment, while maintaining a compact size.
Implementation Method 1
a spring, supporting the positioning member
Implementation Method 2
lubrication in a spline coupling portion between the output shaft and the pinion is not ensured, and therefore fretting wear tends to occur
Data Source
AI summary
A windmill pitch driving apparatus is provided, which is capable of achieving improved durability as well as improved output torque and reduced size. The apparatus includes a fixing mechanism for fixing the output pinion to the output shaft. The fixing mechanism includes a positioning portion and a pressure-applying fixing portion. The positioning portion positions the other end side of the pinion with respect to the output shaft side. The pressure-applying fixing portion biases the pinion toward the output shaft in the direction of the axis P of the output shaft from the one end side and is fixed to the output shaft while applying pressure to the pinion.