Planetary Carrier Pocket Structure for High-Torque Spur Differential
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Solution Overview
Problem
Existing planetary transmissions lack a robust and compact design that can be realized inexpensively while providing favorable rolling conditions for spur gears under high load torques.
Innovation Solution
A planetary transmission with a carrier having three axial wall sections, where the first and second carrier wall sections are formed by a base part and the third by a cover element, with the second carrier wall section featuring pockets that house planets in a second toothing plane, allowing for precise positioning and high load torque coupling, and accommodating a spur gear differential mechanism for torque increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the planetary carrier is composed of a base element and a cover attached by webs, then the structure can be manufactured, but the rigidity is insufficient and manufacturing precision is compromised
Solution Approach 1:
The patent merges the base element and cover into a single integral planetary carrier formed as one piece. This eliminates the need for separate components connected by webs, thereby increasing structural rigidity while reducing assembly complexity. The single-piece construction ensures precise geometric relationships between carrier walls and pockets without requiring high-precision joining operations.
Solution Approach 2:
While the carrier is a single piece, the patent segments the functional elements into distinct carrier wall sections (first, second, and third carrier wall sections) that form pockets for mounting planets. This segmentation allows each wall section to be optimized for its specific function while maintaining overall structural integrity through the integral construction.
2Manufacturing precision
If planets are mounted in intermediate spaces between base element and cover, then assembly is simplified, but positioning precision and rolling conditions deteriorate
Solution Approach 1:
By forming the planetary carrier as a single integral piece, the patent eliminates intermediate spaces between separate components. This ensures precise positioning of planets directly against the carrier walls without gaps or alignment errors that would occur with assembled structures. The single-piece construction inherently provides the manufacturing precision needed for favorable rolling conditions.
3Stability of the object's composition
If a single-piece carrier with three walls is used, then rigidity and positioning are improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent optimizes the geometric parameters of the single-piece carrier, specifically the arrangement and thickness of the three carrier wall sections, to achieve the necessary structural stability with minimal material. This allows the complex geometry to be realized cost-effectively through optimized design rather than excessive material usage or complex manufacturing processes.
Data Source
AI summary
An integrated planetary gearing system includes a reduction gear and a spur gear differential. First planets are arranged in a first planet plane. Second planets are arranged in a second planet plane. A planetary carrier includes a first carrier wall section, a second carrier wall section, and a third carrier wall section. The first and the second carrier wall section are spaced apart from one another axially and are formed by a base part. The third carrier wall section is formed by a cover element which is attached to the base part. The second carrier wall section carries a plurality of pockets, each receiving a planet of the second toothing plane. The cover element is attached to cover seat faces of the pocket bottoms, which cover seat faces in each case face away from the pocket interior.