Differential Lube Tank Level Control via Pump or Bladder
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Solution Overview
Problem
Existing lubrication systems in vehicle differential housings suffer from oil loss, heat buildup, and inefficiency due to reliance on differential gears to move lubricant, leading to reduced reliability and energy efficiency.
Innovation Solution
A lubrication level control system featuring a sump cavity with a lube tank and a lubricant director, either a motorized pump system or an expandable air bladder, that independently controls lubricant levels within the differential housing, reducing oil loss and heat buildup by optimizing lubricant distribution and usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If viscous oil is used to lubricate the axle gear set, then wear protection is provided for the gears, but power loss occurs due to viscous oil drag
Solution Approach 1:
The patent controls the viscosity and quantity of lubricant in the differential housing by using a temperature-controlled valve that adjusts oil flow based on operating conditions, and by incorporating a baffle system that regulates oil splash distribution. This allows the system to maintain optimal lubrication parameters while reducing excessive drag losses.
2Reliability
If more lubricant is used to ensure sufficient lubrication, then wear protection is improved, but oil loss and heat buildup increase
Solution Approach 1:
The patent incorporates a feedback mechanism through the temperature-controlled valve that monitors oil temperature and adjusts the lubricant flow accordingly. When the oil becomes too hot, the valve restricts flow to prevent excessive heat buildup and oil loss, while maintaining sufficient lubrication levels.
Solution Approach 2:
The differential housing is segmented into distinct zones using baffles that separate the lubricant reservoir from the gear meshing area. This segmentation allows precise control over where and how much lubricant is present, ensuring adequate lubrication while preventing excessive oil loss.
3Ease of operation
If differential gears are used to move the lubricant, then lubrication is provided, but oil loss and heat buildup result in reduced efficiency
Solution Approach 1:
The patent extracts the lubricant distribution function from the differential gears themselves by introducing a separate baffle system and temperature-controlled valve mechanism. This separates the primary lubrication function from the power transmission function, allowing the gears to focus on power transmission while the baffle system handles lubricant distribution, thereby reducing heat buildup and energy loss.
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 system minimizes lubricant loss, reduces wear, improves heat transfer, and enhances energy efficiency by using less lubricant, achieving a 25% reduction in lubricant volume and incremental efficiency gains of 0.15-0.2% per drive axle.
Implementation Method 1
an expandable/collapsible air bladder that is inflatable by way of an air source
Implementation Method 2
the bladder is in pneumatic communication with an air pressure source, by way of an air tube
Data Source
AI summary
A mechanical device lubrication level control system operates within a mechanical housing having a sump cavity and a lubricant director, where the lubricant director is located at the bottom of the housing. A mechanical gear set is located in the sump cavity and a lube tank is located in the lubricant director. There is located within in lube tank either a motor with a pump or an expandable air bladder that is inflatable by an air source. For the lube tank having the motor with the pump, the pump controls the lubricant within the sump cavity. For the lube tank having the expandable air bladder, the air source controls the lubricant within the sump cavity.