Anti-Drainback Valve Assembly for Dual Pump Fluid Drainback
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Solution Overview
Problem
Dual pump transmission systems experience transmission fluid drainback issues due to the physical layout of transmission pumps, leading to air bubbles and vibrations when the engine is automatically turned off and on in start-stop technology, which are not fully mitigated by existing solutions.
Innovation Solution
Incorporating an anti-drainback valve and flex tube assembly that transitions between closed and open states based on the operational state of the second transmission pump, preventing fluid backflow and maintaining fluid pressure during engine stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If start-stop technology is implemented to reduce fuel consumption, then fuel efficiency is improved, but transmission fluid drainback occurs causing air bubbles and vibrations
Solution Approach 1:
The anti-drainback valve is pre-configured in the fluid filter to automatically prevent transmission fluid from draining back into the transmission when the engine stops. This preliminary protective action occurs before the engine restarts, eliminating air bubbles and vibrations that would otherwise occur during start-stop operation
Solution Approach 2:
The anti-drainback valve acts as an intermediary component between the transmission system and fluid filter. It mediates the fluid flow by allowing transmission during engine operation while blocking reverse flow during engine stoppages, thus protecting the transmission system from drainback issues
2Use of energy by moving object
If the engine is automatically turned off at stops to improve fuel efficiency, then fuel consumption is reduced, but cavitation noise and vibrations occur due to fluid drainback
Solution Approach 1:
The anti-drainback valve provides preliminary protection by preventing transmission fluid from draining back into the transmission before the engine restarts. This eliminates the formation of air pockets that cause cavitation noise and vibrations, allowing start-stop technology to operate without harmful side effects
3Use of energy by moving object
If dual pump transmission system is used with start-stop technology, then fuel efficiency is improved, but air pocket formation occurs in transmission lines
Solution Approach 1:
The anti-drainback valve is pre-installed in the fluid filter to prevent transmission fluid from draining back into the transmission during engine stoppages. This preliminary action maintains continuous fluid pressure in the transmission lines, preventing air pocket formation that would compromise flow integrity during start-stop operation
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 anti-drainback valve assembly effectively limits or eliminates air pocket formation, reducing cavitation noise and vibrations, and maintaining fluid flow integrity in dual pump transmission systems, especially in vehicles employing start-stop technology.
Implementation Method 1
a biasing member configured to urge the piston towards the valve seat
Implementation Method 2
preventing fluid backflow and maintaining fluid pressure during engine stoppages
Data Source
AI summary
Anti-drainback valves, flex tube assemblies that include one or more anti-drainback valves, and fluid filters that include one or more flex tube assemblies and/or anti-drainback valves are disclosed. In embodiments the anti-drainback valves and flex tube assemblies are described in the context of their use in a multi (e.g. dual) pump fluid filter, such as a dual pump transmission fluid filter. Dual pump fluid filters including integral and separable flex tube assemblies are also described.