Servo Rod O-Ring Grooves Restore Transmission Pressure
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Solution Overview
Problem
The Ford transmission models 5R55W, 5R55S, and 5R55N experience reduced fluid pressure due to worn bores in the transmission housing, leading to leakage and reduced performance, requiring expensive and complex repairs that are inaccessible to most individuals due to the need for specialized tools and high skill levels.
Innovation Solution
Machining o-ring grooves on the servo rod and installing o-rings to restore the pressure differential between the front and back sides of the piston, allowing for a cost-effective solution that can be performed by individuals with minimal mechanical ability, without requiring the transmission to be dropped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional bore sleeving repair method is used, then wear resistance is improved, but device complexity and repair difficulty increase significantly
Solution Approach 1:
The patent uses flexible o-rings installed in grooves machined on the servo rod to seal against the aluminum bore. These thin film seals prevent fluid leakage without requiring rigid sleeve installations, dramatically simplifying the repair process while maintaining effective sealing against wear
Solution Approach 2:
The o-rings are inexpensive, easily replaceable components that can be installed without specialized equipment. When worn, they can be quickly replaced by removing the servo assembly, avoiding the need for expensive, complex sleeve installations and making the repair accessible to DIY enthusiasts
2Reliability
If traditional bore sleeving repair method is used, then sealing performance is improved, but ease of repair deteriorates
Solution Approach 1:
Flexible o-rings provide effective sealing in the grooves machined on the servo rod, preventing fluid leakage past the rod into the reservoir. These seals maintain reliability while being simple to install and replace without specialized tools or equipment
Solution Approach 2:
The sealing function is extracted from the fixed bore structure and placed on the movable servo rod through o-ring grooves. This allows the seals to be easily removed and replaced by simply extracting the servo assembly from the transmission, dramatically improving repair accessibility
3Reliability
If conventional transmission repair is performed, then functionality is restored, but cost increases significantly
Solution Approach 1:
The o-rings are low-cost components that effectively restore sealing functionality. The grooves are machined into the servo rod using standard equipment, and the entire repair can be performed without dropping the transmission, reducing labor costs and making the repair economically accessible to most vehicle owners
Solution Approach 2:
The invention changes the sealing approach from relying on precise bore dimensions to using elastomeric o-rings that compensate for dimensional variations and wear. This parameter change allows effective sealing with simpler, cheaper components and procedures
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 effectively restores the pressure differential, improving transmission performance at a fraction of the cost of traditional repairs, making it accessible to a wider audience and reducing the need for specialized tools and expertise.
Implementation Method 1
o-ring grooves are machined on either side of the cross bore on the servo rod... installing o-rings to restore the pressure differential
Implementation Method 2
a solenoid activates to allow hydraulic fluid flow and pressure to the piston side opposite the direction you want the servo to move... the pistons' surface area is sufficiently large to receive sufficient force against the pistons, provided by the fluid pressure
Data Source
AI summary
A transmission system and method of repair having a transmission servo rod received within a transmission housing bore, the rod having an aperture disposed along an exterior surface of the rod, configured to receive transmission fluid from a port within the transmission housing bore, a first recessed groove in the exterior surface of the rod disposed above the aperture; a second recessed groove in the exterior surface of the rod disposed below the aperture; and a first and second resilient sealing member received within the first and second recessed grooves, respectively, the resilient sealing members configured to engage an inner surface of the transmission housing bore.