Planetary Gear Carrier Segmentation for Pinion Insertion
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Solution Overview
Problem
In existing planetary gear mechanisms, pinion gears cannot be inserted between support portions after the support portions on both sides in the axial direction are coupled together due to the radial extension of the carrier coupling portion, limiting the machining accuracy and axis accuracy of the pinion gears.
Innovation Solution
A planetary gear mechanism design where the carrier coupling portion includes a first shaft support portion and a second shaft support portion, allowing pinion gears to be inserted between them in the axial direction from the outside, enabling improved machining accuracy by allowing the pinion gears to be placed in a space formed between these support portions after the carrier coupling portion and carrier are coupled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the carrier coupling portion extends radially outside the pinion gears along the entire circumference, then the structural integrity of the carrier is improved, but the pinion gears cannot be inserted into the space between the support portions on both sides in the axial direction after the support portions are coupled together
Solution Approach 1:
The carrier coupling portion is segmented into a first coupling portion extending radially outside the pinion gears and a second coupling portion extending radially inside the pinion gears. This segmentation allows the pinion gears to be inserted through the space between support portions while maintaining structural integrity through the distributed coupling portions.
Solution Approach 2:
The pinion gears are nested within the carrier structure by allowing them to be inserted through the space between support portions, while the coupling portions extend both outside and inside the pinion gears to maintain structural integrity without preventing insertion.
2Manufacturing precision
If the support portions on both sides in the axial direction are coupled together before inserting pinion gears, then the machining accuracy of support portions can be improved, but the pinion gears cannot be inserted between the support portions
Solution Approach 1:
The coupling portion is divided into first and second coupling portions located at different radial positions. This segmentation creates a through-space that allows pinion gear insertion while maintaining the coupled structure of support portions for high machining accuracy.
Solution Approach 2:
The solution moves from a two-dimensional view (support portions only) to a three-dimensional view by adding radial extension of coupling portions both outside and inside the pinion gears. This creates a through-space in the radial direction that allows axial insertion of pinion gears while maintaining support portion coupling.
3Productivity
If the pinion gears are inserted through insertion holes in the carrier coupling portion, then the assembly process is simplified, but the axis accuracy of pinion gears decreases due to reduced machining precision of support portions
Solution Approach 1:
The carrier coupling portion is segmented into first and second coupling portions, creating a through-space that allows pinion gears to be inserted between coupled support portions. This maintains high machining accuracy of support portions while enabling efficient assembly through the created space.
Data Source
AI summary
A planetary gear mechanism is desired in which pinion gears can be inserted between support portions on both sides in the axial direction of the pinion gears after the support portions on both sides in the axial direction of the pinion gears are coupled together. In this planetary gear mechanism, a coupling inner portion of a carrier coupling portion is located between a first sun gear and a second sun gear in the axial direction, and a carrier and the carrier coupling portion are formed so that each pinion gears can be inserted between a first shaft support portion and a second shaft support portion in the axial direction from the outside in the radial direction.