Differential Case Contamination Pouch for Centrifugal Oil Debris Removal
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Solution Overview
Problem
In transmission devices, contamination within the differential case can diffuse and degrade the performance of the differential device if not properly managed, with existing technologies lacking effective means to suppress or discharge this contamination.
Innovation Solution
A transmission device design featuring a differential case with a contamination pouch having an inlet at the largest inner diameter part to collect contamination via centrifugal force, and an oil discharging port to facilitate easy removal of collected contamination, along with a protruding part to prevent contamination from escaping, and a configuration that bridges over the carrier and differential case to increase capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the differential case stores oil inside the body part, then lubrication performance is improved, but contamination accumulates and diffuses degrading device performance
Solution Approach 1:
The patent extracts the harmful contamination from the oil storage system by providing a dedicated discharge path. The oil discharging port communicates the interior of the body part with the exterior, allowing contamination to be removed from the system while retaining the beneficial oil storage function for lubrication.
Solution Approach 2:
The patent introduces an intermediary structure (the oil discharging port) that mediates between the oil storage function and contamination removal. This port serves as a passage that allows selective removal of harmful substances while maintaining the lubrication benefit of stored oil.
2Productivity
If the inlet of the contamination pouch is arranged at the largest inner diameter part, then contamination collection efficiency is improved via centrifugal force, but the structure becomes more complex
Solution Approach 1:
The patent employs self-service by utilizing the natural centrifugal force generated during differential case rotation to collect contamination. The inlet positioned at the largest inner diameter part automatically captures contamination through centrifugal action without requiring additional active collection mechanisms, thereby improving efficiency while maintaining structural simplicity.
3Reliability
If the protruding part closes part of the inlet, then contamination retention is improved, but the inlet area is reduced
Solution Approach 1:
The patent applies local quality by providing differential closure characteristics at different locations of the inlet. The protruding part selectively closes only a portion of the inlet, creating localized control over contamination entry and exit. This allows the inlet to simultaneously maintain sufficient area for oil flow while providing retention capability through partial closure at specific locations.
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
Effectively suppresses contamination diffusion and degradation of the differential device's performance by utilizing centrifugal force to collect and discharge contamination, enhancing the device's operational reliability.
Implementation Method 1
the inlet is arranged in a largest inner diameter part on which a largest centrifugal force acts during rotation of the differential case
Data Source
AI summary
Provided is a transmission device including a differential case. The differential case includes at least a part of a contamination pouch. The contamination pouch includes an inlet facing into a body part of the differential case and capable of collecting a contamination in an oil inside the body part. In an inner surface of the differential case, the inlet is arranged in a largest inner diameter part on which a largest centrifugal force acts during rotation of the differential case, or arranged closer to an oil discharging port with respect to the largest inner diameter part in an axial direction.