Scavenge Pump Port Alignment for Tiltrotor Gearbox Oil Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In tiltrotor rotorcraft drive systems, excessive air mixing with oil during lubrication poses challenges due to the orientation of scavenge ports, leading to inefficient lubrication and potential safety risks from heat generation and premature component failure.
Innovation Solution
A scavenge pump system with a fixed pump orientation and a rotating outer housing, featuring selectively alignable ports to minimize air mixing by controlling fluid communication based on gearbox orientation, ensuring sufficient oil flow while preventing air entry into scavenge lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scavenge ports are oriented to collect oil in tiltrotor gearboxes, then oil flow is maintained during operation, but air mixes with the oil creating a two-phase mixture that requires additional equipment and design considerations
Solution Approach 1:
The scavenge pump is divided into separate functional sections: an air removal chamber that collects and removes air from the oil mixture, and a pumping chamber that handles only oil. This segmentation allows the pump to separately address air removal and oil circulation functions, preventing air from being pumped along with oil while maintaining adequate oil flow to the gearbox.
Solution Approach 2:
A baffle structure acts as an intermediary element between the air-oil mixture entry and the pump inlet. The baffle creates a separation zone that allows air to rise and be removed before the oil enters the pumping mechanism, effectively mediating the separation of the two-phase mixture without requiring complex additional equipment.
2Reliability
If pump orientation is fixed relative to the aircraft, then lubrication consistency is maintained during attitude changes, but scavenge ports cannot effectively collect oil due to gearbox orientation variations
Solution Approach 1:
The pump housing is made dynamically adjustable relative to the gearbox, allowing the scavenge ports to be repositioned according to the gearbox orientation during different flight modes. This dynamic adjustment capability enables the system to maintain effective oil collection while keeping the pump's output orientation consistent for reliable lubrication delivery.
Solution Approach 2:
The system changes the spatial parameters of the pump housing orientation relative to the gearbox based on operational conditions. By adjusting the housing angle and port positions, the system adapts to different gearbox orientations during tiltrotor operations, ensuring optimal oil collection efficiency while maintaining consistent lubrication output.
3Object-generated harmful factors
If additional equipment is added to remove air from the oil mixture, then air separation is achieved, but device complexity increases
Solution Approach 1:
The air removal function is merged into the pump housing structure itself rather than being a separate external system. The housing incorporates an air collection chamber and baffle structures that work together with the pumping mechanism in a single integrated unit, eliminating the need for additional standalone air separation equipment and reducing overall system complexity.
Solution Approach 2:
The pump system performs its own air removal function through internally integrated structures. The air separation chamber and baffles within the housing allow the pump to automatically separate and remove air from the oil mixture without requiring external air removal equipment, making the system self-sufficient and reducing 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
The solution effectively reduces air mixing with oil, enhancing lubrication efficiency and reducing the risk of heat-related failures by maintaining optimal lubricant flow across varying aircraft orientations, thereby improving the reliability and safety of the rotorcraft drive systems.
Implementation Method 1
The pump and outer housing each have ports that align based on the orientation of the gearbox for controlling the flow of oil and air
Data Source
AI summary
A fluid pump system for an aircraft has a rotatable component having first and second fluid ports, each port in fluid communication with a selected interior portion of the component, the portions being spaced from each other. A valve controls allows a first flow rate through the first fluid port and allows a second flow rate through the second fluid port when the component is in a first angular orientation. The valve allows a third flow rate through the first fluid port and allows a fourth flow rate through the second fluid port when the component is in a second angular orientation.