Planetary Gear Cover for Axial Space Reduction
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Solution Overview
Problem
Existing planetary gears, such as differential gears, require significant axial space and have unstable bearings, leading to inefficiencies in design and increased costs.
Innovation Solution
A thin-walled cover is placed radially between the planetary carrier and the sun wheel, acting as a reinforcement and seal, allowing for larger radial distances to be bridged and providing stability while reducing weight and costs, with the cover optionally integrated with the bearing rings or forming a pot region for enhanced support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bearings are used for positioning the planetary carrier, then the bearing stability is insufficient, but increasing the bearing size increases axial space requirements
Solution Approach 1:
The cover is integrated with the bearing rings to form a unified structure. The outer bearing ring is formed as an extension of the cover, creating a combined component that provides both sealing and bearing functions, thereby improving bearing stability without increasing axial space requirements
Solution Approach 2:
The cover serves multiple functions: it acts as a seal between the planetary carrier and sun wheel, provides reinforcement, supports the bearing outer ring, and contributes to the overall structural stability. This multi-functionality eliminates the need for separate bearing components that would increase axial dimensions
2Weight of moving object
If a thin-walled cover is used to reduce weight and axial space, then the structural strength may be compromised, but the cover must provide sufficient reinforcement
Solution Approach 1:
The cover is constructed from composite materials or optimized material combinations that provide high strength-to-weight ratio. The material selection and structural design enable the thin-walled cover to maintain sufficient reinforcement capabilities while minimizing weight
Solution Approach 2:
The cover thickness is optimized locally - thinner in non-critical areas to reduce weight, and reinforced in critical load-bearing regions where strength is required. This localized quality variation maintains overall structural integrity while minimizing total material usage
Data Source
AI summary
A planetary gear of a differential gear, with a planetary carrier to which planetary wheels are rotatably connected and which are in meshing operative contact with at least one sun wheel, whereby the planetary carrier is connected to a driving wheel, further comprising a roller bearing that is provided with two bearing rings, a bearing inner ring and a bearing outer ring for axial and/or radial position determination of the planetary carrier relative to a fixed housing, wherein a cover is positioned radially between the planetary carrier and the sun wheel.