Planetary Reduction Gear Bearing Adjustment for Axial Clearance
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Solution Overview
Problem
Existing reduction assemblies with planetary gear systems face challenges in precise positioning of bearings, requiring complex operations and specialized components to correct dimensional errors, leading to potential errors and increased production costs.
Innovation Solution
A reduction group with a fixed ring gear and central sun gear, featuring adjustable planetary gear shafts and bearings with axial clearance, allowing for intuitive assembly and adjustment within a containment box, using standard tolerance bearings and commercial washers, and incorporating locking mechanisms for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bearings are positioned with high geometric precision in planetary gear systems, then operational reliability is improved, but production complexity and cost increase due to required special operations and selected components
Solution Approach 1:
The planetary gear shaft is made adjustable along the group axis through threaded engagement with the planetary gear holder, allowing dynamic positioning of bearings to compensate for dimensional variations. This replaces static precision positioning with a dynamic adjustment mechanism that accommodates normal tolerance components.
Solution Approach 2:
The invention changes the positioning parameter from fixed geometric precision to adjustable axial position. By allowing axial movement of the planetary gear shaft within a controlled range, the system can adapt to dimensional variations in standard tolerance bearings and washers, eliminating the need for high-precision components.
2Manufacturing precision
If geometric precision in bearing positioning is ensured through special operations, then positioning accuracy is improved, but production time and cost increase
Solution Approach 1:
The adjustment mechanism allows operators to self-correct positioning errors during assembly by axially moving the planetary gear shaft. Standard tolerance components self-adjust to achieve proper bearing positioning without requiring pre-processed special components or complex machining operations.
Solution Approach 2:
The threaded adjustment mechanism is pre-configured in the planetary gear holder, allowing bearing positioning to be corrected during assembly rather than requiring precise pre-machining. This preliminary preparation of the adjustment mechanism enables quick correction of positioning errors.
3Ease of manufacture
If standard tolerance bearings and commercial washers are used, then production cost is reduced, but positioning precision deteriorates without adjustment mechanisms
Solution Approach 1:
The adjustable planetary gear shaft provides a dynamic correction mechanism that compensates for the dimensional variations inherent in standard tolerance bearings and commercial washers. This allows the use of economical standard components while maintaining proper bearing positioning through axial adjustment.
Data Source
AI summary
A reduction group for a vehicle and a reduction assembly including the reduction group are provided. The reduction group has a ring gear, a central sun gear, a planetary gear holder and at least one planetary gear on the planetary gear holder. The at least one planetary gear has a gear meshed externally with the ring gear and internally with the central sun gear, a planetary gear shaft fixed to the planetary gear holder and a pair of bearings supporting the gear on the planetary gear shaft. The planetary gear shaft and the planetary gear holder are engaged so that the planetary gear shaft is axially adjustable on the planetary gear holder in an operational configuration in which the planetary gear shaft performs an axial tightening action on the pair of bearings exhibiting an axial clearance adapted to allow rotation of the pair of bearings.