Compact Multi-Stage Planetary Gear Reducer Design
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Solution Overview
Problem
Conventional multi-stage planetary gear mechanisms in reducers result in a long axial profile, leading to potential collisions when used in crawler tracks or tire loops, as they protrude beyond the width, compromising spatial efficiency and increasing the risk of object collisions.
Innovation Solution
The design incorporates a fixed housing with a motor and a rotation housing supported by a bearing, featuring multi-stage planetary gear mechanisms where the final-stage planetary gear mechanism is positioned downstream, with planetary gear shafts supported at one end by the fixed housing and the other end by a bearing support member, reducing the axial length and enhancing compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-stage planetary gear mechanisms are arranged in the direction of the rotation axis to achieve high reduction ratios, then the reduction ratio is improved, but the axial length of the reducer increases, causing it to protrude beyond the crawler or tire width and increase the risk of collision with objects
Solution Approach 1:
The patent changes the arrangement dimension of the multi-stage planetary gear mechanisms from the axial direction (rotation axis direction) to the radial direction (width direction). Specifically, the first and second planetary gear mechanisms are arranged side-by-side in the width direction of the crawler or tire, with their rotation axes perpendicular to each other. This dimensional reconfiguration allows the reducer to achieve high reduction ratios without increasing axial length, thereby preventing protrusion beyond the crawler or tire width and reducing collision risk with objects.
2Length of moving object
If the final-stage planetary gear mechanism is positioned downstream with planetary gear shafts supported at one end by the fixed housing and the other end by a bearing support member, then the axial length is reduced and compactness is improved, but the structural complexity increases
Solution Approach 1:
The patent merges the bearing support function with the planetary gear shaft support structure. The bearing support member is integrated into the fixed housing, combining the functions of structural support and rotational support. This integration reduces the number of separate components and simplifies the overall structure, thereby reducing axial length and improving compactness without significantly increasing structural complexity.
Data Source
AI summary
A reducer includes a fixed housing, a rotation housing, and multi-stage planetary gear mechanisms. The fixed housing contains a motor in the fixed housing. The rotation housing is rotatably supported by the fixed housing via a bearing at an outer surface of a one-end wall of the fixed housing. The multi-stage planetary gear mechanisms are configured to decelerate a rotation of the motor and transmit the rotation that has been decelerated to the rotation housing. The multi-stage planetary gear mechanisms include a final-stage planetary gear mechanism located at a downstream position in a direction in which motive power is transmitted. The final-stage planetary gear mechanism include a planetary gear rotatably supported by a planetary gear shaft that is supported at one end of the planetary gear shaft by the one-end wall of the fixed housing.