Planetary Transmission Support Structure for Low-Backlash Torque Transfer
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Solution Overview
Problem
Conventional Wolfrom planetary transmissions face challenges in efficiently supporting radial forces and tilting moments during torque transmission, leading to potential misalignment and reduced efficiency due to the reliance on a planet carrier for radial support.
Innovation Solution
The implementation of a cylindrical support region that radially supports the planetary gears or stepped planetary gear, providing additional support points to minimize backlash and enhance torque transmission efficiency, with helically toothed gearing regions ensuring continuous contact and reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planet carrier with radial bearings is used to support planetary gears, then the planetary gears are supported against radial forces and tilting moments, but the structure becomes more complex and larger
Solution Approach 1:
The invention extracts and eliminates the planet carrier component from the transmission system. Instead of using a separate carrier structure with radial bearings to support the planetary gears, the planetary gears are directly supported on the sun gear's outer circumferential surface, which is specifically designed as a support surface. This removes the unnecessary carrier structure while maintaining the support function.
Solution Approach 2:
The sun gear is given a dual function: it not only transmits torque through its teeth but also serves as a support structure for the planetary gears through its outer circumferential surface. This support surface is specifically designed to bear the radial forces and tilting moments acting on the planetary gears, eliminating the need for a separate carrier structure.
2Manufacturing precision
If conventional radial bearings are used to support planetary gears, then misalignment is prevented, but friction and energy loss increase
Solution Approach 1:
The invention replaces the conventional radial bearing mechanism with a direct surface contact support system. The planetary gears are supported directly on the sun gear's outer circumferential support surface without intermediate bearing elements. This substitution eliminates the friction and energy losses associated with radial bearings while maintaining precise alignment through the carefully designed support surface geometry.
3Productivity
If a cylindrical support region is implemented to radially support planetary gears, then backlash is reduced and efficiency increases, but the design deviates from conventional structures
Solution Approach 1:
The invention applies local quality by creating a specifically designed cylindrical support surface on the sun gear's outer circumferential area. This support surface has precise geometric properties (cylindrical shape with specific diameter and length) that are optimized to reduce backlash and improve transmission efficiency. The support function is localized to this specific region rather than being distributed throughout a separate carrier structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces backlash, increases efficiency, and prevents tilting or misalignment of the planetary axis, allowing for a more compact and efficient transmission design without the need for conventional radial bearings.
Implementation Method 1
The first ring gear has an internally helically toothed first gearing region, the sun gear has an externally helically toothed second gearing region, and the planetary gear has an externally helically toothed third gearing region
Data Source
AI summary
A planetary transmission (2) includes a stepped planetary gear (24), or planetary gears, which are connected to each other, that is/are disposed radially between a first shaft (6) and axially-adjacent first and second ring gears (12, 16). The stepped planetary gear, or connected planetary gears, include(s) a first gearing region (26) that meshes with a sun gear (8) on the first shaft (6) and the first ring gear (12), as well as a helically-toothed second gearing region (28) that meshes with the second ring gear (16). A cylindrical support region (32) is coaxially provided on/around the first shaft. The stepped planetary gear or the connected planetary gears is/are supported on the cylindrical support region of the first shaft by the outer circumferential surface of the second gearing region. The second gearing region lies on the addendum circle of the second gearing region.