Differential Case Assembly Using Carrier-Fixed Second Case
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Solution Overview
Problem
The existing transmission device has a complex case structure due to the integration of the carrier and differential case, leading to increased costs and a need for a dedicated fixing mechanism for the second case, which complicates assembly and increases costs.
Innovation Solution
The transmission device is designed with a differential case divided into first and second cases, where the second case is fixed to the first case using a carrier that pivotally supports the planetary gears, simplifying the structure and eliminating the need for a dedicated fixing mechanism, allowing for easier assembly and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the carrier and differential case are integrated into a single component, then the structural strength and rigidity are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The differential case is divided into two separate cases: the first case integrates with the carrier to support planetary gears, while the second case houses the differential mechanism. This segmentation allows each case to be optimized for its specific function, reducing overall complexity while maintaining structural integrity through functional specialization.
2Stability of the object's composition
If the carrier is integrated with the differential case, then the structural rigidity is improved, but the ease of manufacture and assembly deteriorate
Solution Approach 1:
The carrier and differential case are segmented into separate components that can be manufactured independently using standardized processes. The first case is manufactured to integrate with the carrier, while the second case is separately manufactured and then assembled, improving manufacturing flexibility and assembly ease while maintaining rigidity through proper joint design.
Solution Approach 2:
The first case acts as an intermediary component that connects the carrier and the second case. This intermediary structure provides a standardized interface that simplifies assembly while distributing structural loads to maintain overall rigidity of the differential assembly.
3Reliability
If a dedicated fixing mechanism is used to attach the second case to the first case, then the reliability of connection is improved, but the device complexity and cost increase
Solution Approach 1:
The fixing mechanism is merged with the first case structure itself. The first case is designed with integrated fixing features such as ribs, flanges, or interlocking elements that directly attach the second case, eliminating the need for separate dedicated fixing components while maintaining connection reliability through structural integration.
Solution Approach 2:
The first case serves multiple functions: it supports the carrier and planetary gears, houses the differential mechanism, and provides the fixing structure for attaching the second case. This multi-functionality reduces the need for additional dedicated fixing components, simplifying the overall structure while maintaining reliable connections.
Data Source
AI summary
Provided is a transmission device including a differential case. The differential case is configured to be divided into first and second cases defining therebetween a mechanism chamber housing a differential mechanism therein and capable of storing an oil at a bottom part of the mechanism chamber. Two or more planetary gears are pivotally supported by a carrier of a gear reducer in the vicinity of large-diameter gear parts and pivotally supported by the differential case in the vicinity of small-diameter gear parts. The second case is held between the first case and the carrier coupled to the first case, whereby the second case is fixed to the first case.