Disconnect Differential Lubrication via Position-Based Casing Alignment
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Solution Overview
Problem
Existing disconnecting differentials face challenges in efficiently lubricating moving internal components while maintaining driveline efficiency, particularly in disconnected states where power loss is significant.
Innovation Solution
The implementation of a disconnecting differential with a position sensor and a rotating differential casing that aligns a casing aperture with an oil jet to ensure lubrication of internal components, even when the differential is in a disconnected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the differential is in a disconnected state to improve driveline efficiency, then power loss is reduced, but lubrication of moving internal components becomes insufficient
Solution Approach 1:
The differential casing is rotated periodically to align the lubrication aperture with the stationary oil jet, enabling intermittent lubrication delivery. This periodic alignment ensures that moving internal components receive lubricant at appropriate intervals even when the differential is disconnected, resolving the contradiction between energy efficiency and component protection.
2Device complexity
If a stationary oil jet is used to lubricate moving components, then lubrication is simplified, but the lubricant cannot reach components when the casing rotates away
Solution Approach 1:
The lubrication aperture in the differential casing acts as an intermediary between the stationary oil jet and the moving internal components. By rotating the casing to align the aperture with the oil jet, the system enables reliable lubricant transfer without requiring the oil jet itself to move, thus maintaining system simplicity while ensuring continuous lubrication delivery.
3Reliability
If the differential casing is rotated to align with the oil jet, then lubrication is improved, but additional control complexity is introduced
Solution Approach 1:
The differential casing utilizes its own rotational movement, already necessary for differential operation, to self-align with the stationary oil jet. This self-service approach enables lubrication alignment without requiring separate actuators or complex control systems, thereby improving reliability while minimizing additional complexity.
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
This solution enhances lubrication of moving internal components while reducing the amount of lubricant needed, thereby increasing driveline efficiency and reducing power loss associated with the axle.
Implementation Method 1
a position sensor configured to determine a rotational position of the output gear
Implementation Method 2
an oil jet configured to provide lubrication to moving internal components of the differential via the casing aperture
Data Source
AI summary
Example illustrations are directed to a differential, e.g., a disconnecting differential, and associated methods. A disconnecting differential may include two side gears configured to deliver torque from an output gear or differential casing to respective vehicle wheels when the differential is in a connected state. Each of the side gears may be configured to receive the torque from the output gear while permitting a differential speed between the side gears. The disconnecting differential may also include a disconnect device configured to disconnect the output gear from the two side gears such that the differential is in a disconnected state. The disconnecting differential may also include a position sensor configured to determine a rotational position of the output gear.