Planetary Gear Carrier Assembly Through Ring Gear Clearance
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Solution Overview
Problem
Existing planetary gear systems require complex assembly processes due to split planet carriers, leading to potential quality loss and increased assembly effort.
Innovation Solution
A planetary gear system design where the planet carrier is rotatably mounted in the housing with defined assembly direction, featuring bearing seats of varying diameters and a simplified assembly process, allowing for one-piece or multi-part assembly outside the housing, and utilizing stepped planet gears with helical toothings to balance axial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a split planet carrier is used to enable assembly from two sides, then the assembly process can be completed, but the assembly effort increases and quality is lost
Solution Approach 1:
The invention divides the assembly process into two stages: first assembling the planet carrier with planet gears outside the housing, then inserting the complete assembly into the housing. This segmentation allows complex components to be pre-assembled elsewhere, reducing in-housing assembly complexity while maintaining structural integrity
Solution Approach 2:
The planet carrier is designed with a receiving space that accommodates the planet gears, creating a nested structure where planet gears are housed within the planet carrier. This nested design allows the entire sub-assembly to be treated as a single unit for insertion into the main housing
2Ease of operation
If the bearing seat diameter is smaller than the ring gear inner diameter, then the planet carrier can be inserted from one side, but the bearing arrangement becomes constrained
Solution Approach 1:
The planet carrier features asymmetric bearing seat positioning with different diameters - the first bearing seat has a smaller diameter than the ring gear inner diameter to enable insertion, while the second bearing seat has a larger diameter for proper bearing support. This asymmetric design resolves the contradiction between insertion ease and bearing arrangement
Data Source
AI summary
The invention relates to an epicyclic gear with a housing, a sun gear, a planet carrier, at least one planet gear and a ring gear. The planet carrier is rotatably mounted in the housing. The housing defines an assembly direction for mounting the planet carrier. A bearing seat of the planet carrier, which serves for the rotatable mounting of the planet carrier in the housing and which is arranged adjacent to an insertion end of the planet carrier and in the use position of the planet carrier in the assembly direction behind the ring gear, has a diameter which is smaller than an inner diameter, in particular than a tip diameter, of the ring gear.