Differential Clutch Case Perforations for Lubricant Circulation
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Solution Overview
Problem
Conventional differential devices face issues with lubricant oil circulation, leading to energy inefficiency due to excessive lubricant resistance and potential burnout from inadequate lubrication, especially when trying to minimize lubricant oil usage.
Innovation Solution
A differential device design featuring a ring gear with a tooth row that expels lubricant oil through centrifugal force, combined with perforations in the outer case to facilitate circulation and reduce lubricant oil amount while ensuring adequate lubrication, including a clutch mechanism for disconnecting axles and a differential gear set for differential motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abundant lubricant oil is supplied to immerse the axles, then adequate lubrication is achieved, but energy efficiency deteriorates due to resistance to rotation
Solution Approach 1:
The outer case is divided into multiple regions through perforations, creating distinct zones for lubricant oil circulation. This segmentation allows lubricant to be distributed to specific areas (dog teeth, clutch member contact surfaces) without requiring abundant oil throughout the entire device, thus maintaining adequate lubrication while reducing overall lubricant quantity and resistance to rotation.
Solution Approach 2:
The perforations act as intermediaries that facilitate controlled lubricant oil circulation between the interior and exterior of the outer case. These openings enable lubricant to reach critical components (dog teeth, clutch member) through centrifugal force during rotation, providing adequate lubrication without requiring excessive lubricant oil that would create rotational resistance.
2Use of energy by moving object
If the amount of lubricant oil is reduced to improve energy efficiency, then resistance to rotation decreases, but burnout risk increases due to inadequate lubrication
Solution Approach 1:
The perforations are pre-positioned in the outer case to anticipate and enable lubricant oil circulation paths before the device operates. During rotation, centrifugal force automatically directs lubricant through these pre-designed channels to critical components, ensuring adequate lubrication is achieved proactively without requiring excessive lubricant quantity, thus preventing burnout while maintaining energy efficiency.
Solution Approach 2:
The differential device utilizes its own rotational motion to generate centrifugal force that automatically circulates lubricant oil through the perforations to where it is needed (dog teeth, clutch member contact surfaces). This self-service mechanism ensures adequate lubrication without requiring external pumping systems or excessive lubricant quantities, maintaining energy efficiency while preventing burnout.
3Volume of moving object
If the outer case is designed as a nested structure with the inner case, then compact design is achieved, but lubricant oil circulation is impeded leading to burnout control issues
Solution Approach 1:
The outer case is designed with perforations that create a porous-like structure, allowing lubricant oil to pass through the case wall. This enables effective lubricant circulation between the nested inner and outer cases without requiring a complex, non-compact structure. The perforations maintain the compact nested design while ensuring adequate lubrication reaches all components, preventing burnout.
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
The design effectively reduces lubricant oil resistance, improves energy efficiency, and prevents burnout by optimizing lubricant oil circulation and distribution within the device, even with reduced lubricant amounts.
Implementation Method 1
the lubricant oil intrudes through the axles into the differential device and is, by centrifugal force by rotation thereof, made to circulate outward
Data Source
AI summary
A differential device is provided with: a ring gear having a tooth row arranged around an axis to mesh with an input gear; an outer case combined with the ring gear and rotatable about the axis; an inner case rotatable about the axis relative to the outer case and having a toothed end with axially projecting dog teeth; a differential gear set supported by the inner case and to be coupled with a pair of axles to allow differential motion between the axles; a clutch member engaging with the outer case and disconnectably connecting with the dog teeth so as to prevent the inner case from rotating relative to the outer case; and perforations penetrating the outer case and opened on an outer face of the outer case, the perforations being so disposed as to expose the dog teeth radially outwardly from the outer case.