Variable Volume Axle Sump Bi-Metal Valve Temperature Control
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Solution Overview
Problem
Typical axle configurations with a single lubricant reservoir result in parasitic losses due to excess lubricant, leading to inefficiency during normal operation at lower temperatures, as they are designed for maximum thermal conditions.
Innovation Solution
A variable volume axle system with a separate reservoir and bi-metal valve that regulates fluid communication between the gear chamber and reservoir based on temperature, allowing for reduced lubricant usage during lower temperature operation and optimal lubrication at higher temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single lubricant reservoir is used to accommodate maximum thermal conditions, then thermal protection is improved, but parasitic pumping losses increase during normal operation
Solution Approach 1:
The lubricant storage system is segmented into two separate reservoirs: a primary reservoir that holds the maximum lubricant volume for thermal protection, and a secondary reservoir that holds additional lubricant. A regulator valve controls the flow between these reservoirs, allowing the system to segment the lubricant supply based on operational needs, thereby reducing parasitic losses during normal operation while maintaining thermal protection capability.
2Temperature
If a high volume of lubricant is stored in a single reservoir, then thermal goals are achieved, but fuel economy deteriorates due to increased pumping losses
Solution Approach 1:
The system dynamically adjusts the lubricant volume in the primary reservoir through a temperature-sensitive regulator valve. When temperature is low, the regulator closes to prevent flow to the secondary reservoir, reducing lubricant volume and pumping losses for improved fuel economy. When temperature rises, the regulator opens to allow lubricant flow, increasing volume to meet thermal goals. This dynamic adjustment resolves the contradiction between thermal performance and fuel economy.
3Loss of energy
If a regulator is added to control lubricant flow between reservoirs, then pumping losses are reduced, but device complexity increases
Solution Approach 1:
The regulator valve is designed to be self-regulating based on temperature conditions, automatically controlling lubricant flow between reservoirs without external control systems. This passive, temperature-responsive design reduces pumping losses while minimizing the added complexity that would result from active control mechanisms, sensors, or actuators.
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 design reduces pumping losses and increases axle efficiency, enhancing fuel economy by optimizing lubricant distribution according to operational temperature.
Implementation Method 1
the regulator is a bi-metal valve formed from at least two different layers of materials
Data Source
AI summary
An axle having a variable volume sump. The axle includes an axle housing that defines a gear chamber and a separate reservoir. The gear chamber and the reservoir are in fluid communication with each other via an opening. A regulator is located adjacent the opening. The regulator is operable to assume a first closed position that obstructs the opening when a temperature in the axle is below a predetermined value, and is also operable to assume a second open position that places the gear chamber and the reservoir in fluid communication via the opening when the temperature is above the predetermined value.