Planetary Gearbox Segmented Gears Tolerance Compensation
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Solution Overview
Problem
Existing planetary gear trains face challenges in adjusting gear ratios and assembly due to manufacturing tolerances and interdependencies between components, requiring disassembly for setting and lacking sufficient flexibility in tooth engagement adjustments.
Innovation Solution
A planetary gear train design featuring gearwheels with two stages and interconnected teeth through a non-positive or frictional connection, allowing for adjustable relative positions and automatic readjustment, combined with an axial adjustment device for backlash-free operation and torque limitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tapered or conical gearwheels are used for adjustment, then backlash-free engagement can be achieved, but the adjustment of one gear pairing influences the adjustment of another gear pairing
Solution Approach 1:
The planetary gear is divided into two independently adjustable segments: the first gearwheel (planetary gear) with first teeth for the ring gear, and the second gearwheel (sun gear) with second teeth. Each gear pairing can be adjusted independently through separate axial displacement mechanisms, eliminating the interference that occurs when adjusting conical gearwheels as a unified component.
2Device complexity
If planetary gears are mounted on a rotationally fixed shaft, then the structure is simplified, but the position of planetary gears cannot be changed during operation
Solution Approach 1:
The mounting structure transitions from a static, rotationally fixed shaft to a dynamic adjustment mechanism. The planetary gear can be axially displaced relative to the sun gear through the first adjustment mechanism, enabling operational adjustment of gear engagement while maintaining structural simplicity through guided movement paths.
3Manufacturing precision
If manufacturing tolerances are reduced for high accuracy, then tooth engagement precision improves, but manufacturing outlay increases
Solution Approach 1:
Instead of relying solely on reduced manufacturing tolerances, the invention introduces axial displacement as an adjustable parameter. The first and second gearwheels can be axially positioned to compensate for tolerance variations, achieving high tooth engagement precision through adjustment rather than through costly precision manufacturing processes.
4Power
If a plurality of tooth engagements are used for high power density, then transferable torque increases, but the interdependence of tolerances increases
Solution Approach 1:
The multiple tooth engagements are segmented into independently adjustable gear pairings. The first gearwheel engages the ring gear through first teeth, while the second gearwheel engages the sun gear through second teeth. Each pairing can be independently adjusted to compensate for tolerance variations, maintaining high transferable torque without the compounding tolerance issues that arise from interdependent gear engagements.
Data Source
AI summary
A planetary gearbox has multiple first gears in the form of planetary gears, each mounted for rotation about a first axis of rotation. Each gear has two stages, with a first stage formed by bevel teeth which mesh with a ring gear, and with teeth forming a second stage. The planetary gearbox also has a second gear in the form of a ring gear and a gear in the form of a sun gear with teeth which mesh with the teeth of the second stage. The teeth of the first and second stages are connected by a force-locked or frictional connection which allows various angular positions relative to the common axis of rotation. The force-locked connection also serves as a torque-limiting slip clutch for limiting the maximum transmissible torque.