Compact Planetary Gear Drive Assembly with Nested Hub Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric planetary reduction drives face challenges in minimizing size and rollback, particularly in applications like scissors lifts and boom lifts, due to inefficiencies in gear design and backlash issues.
Innovation Solution
A compact planetary gear drive design where the planetary gear assembly is entirely housed within the output hub, incorporating a compound gear system that reduces rotational speed and limits backlash through strategic placement and clamping of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the planetary gear assembly is disposed entirely in the output hub, then the overall size and length of the drive is reduced, but the manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The planetary gear assembly is nested entirely within the output hub, with the sun gear, planet gears, and ring gear arranged in a compact configuration that fits inside the hub volume. This nesting approach reduces the overall drive size by eliminating external gear housings and consolidating components into a single integrated structure.
Solution Approach 2:
The output hub is merged with the planetary gear assembly housing, combining what would traditionally be separate components into a unified structure. This integration reduces the number of external parts and simplifies the overall drive architecture, achieving compact dimensions while maintaining gear functionality.
2Reliability
If backlash is limited through strategic placement and clamping of components, then rollback is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
Backlash is controlled through preliminary clamping and precise component placement during assembly. The planetary gears are pre-positioned with specific clearances, and clamping mechanisms are applied beforehand to maintain optimal gear mesh spacing, preventing excessive backlash and rollback before operation begins.
Solution Approach 2:
The gear mesh parameters are optimized by adjusting the clearance and positioning of planet gears relative to the sun and ring gears. By changing the spatial parameters of gear engagement through strategic placement, the system achieves reduced backlash while managing manufacturing precision requirements through design-level parameter optimization.
Data Source
AI summary
A reduction drive assembly includes a housing and a flange. Outer surfaces of the spindle and the flange form at least one fillet corner. A motor output shaft extends through an aperture of the spindle. The reduction drive assembly includes a planetary gear assembly that includes a sun gear driven by the motor output shaft and gears. The reduction drive assembly includes a fixed ring gear that is meshed with a second stage gear of each of the planet gears, an output hub, a rotating ring gear coupled to the output hub and meshed with a first stage gear of each of the planet gears, a set of bearings positioned radially between the spindle and the output hub and axially between the fixed ring gear and the flange of the housing, and a spacer ring positioned between the set of bearings and adjacent the at least one fillet corner.