High Torque Reverse Clutch for Powerglide Transmission
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Solution Overview
Problem
The Powerglide transmission's first gear ratio cannot be reduced below 1.65:1 due to space constraints, and existing modifications to the reverse clutch in Powerglide transmissions do not effectively increase torque capacity without robbing horsepower from the drivetrain.
Innovation Solution
A High Torque Capacity (HTC) reverse clutch with an increased mean diameter and a compound planetary gear set with a lower numerical first gear ratio, allowing for a larger input sun gear and stronger components within the existing transmission case, enabling a first gear ratio less than 1.64:1 without compromising strength or durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the reverse clutch mean diameter is increased to increase torque capacity, then the torque capacity is improved, but the space available for the planetary gear set is reduced
Solution Approach 1:
The patent increases the reverse clutch mean diameter by extending it in the radial dimension, which traditionally would reduce space for the planetary gear set. However, this is compensated by redesigning the planetary gear set with a lower numerical first gear ratio that requires less radial space, effectively using dimensional redesign to resolve the space conflict.
Solution Approach 2:
The patent changes the numerical first gear ratio parameter of the planetary gear set to a lower value, which alters the spatial requirements of the gear set. This parameter change allows the reverse clutch to have a larger mean diameter while maintaining adequate space for the planetary gear components.
2Speed
If the numerical first gear ratio is reduced to improve traction, then the gear ratio is improved, but the space constraints prevent achieving ratios below 1.65:1
Solution Approach 1:
The patent successfully changes the numerical first gear ratio parameter to a value below 1.65:1 by redesigning the planetary gear set dimensions and configuration. This parameter change is made possible by coordinating the reduced gear ratio with the increased reverse clutch diameter, allowing both goals to be achieved within the same transmission case.
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 achieves a lower numerical first gear ratio and enhances the torque capacity of the reverse clutch, improving traction and launch performance in high-horsepower applications without reducing drivetrain power.
Implementation Method 1
The reverse clutch can include one or more friction discs, or frictions, that are coupled to the ring gear
Data Source
AI summary
A reverse clutch and planetary gear set are provided that can be installed in an automotive transmission. In some embodiments, the reverse clutch and planetary gear set are configured and dimensioned to be installed in a Powerglide transmission case. In other embodiments, the reverse clutch can have an increased mean diameter. In some embodiments, the reverse clutch can have an increased static holding capacity. In another embodiment, the planetary gear set can have a reduced numerical first gear ratio. In other embodiments, the planetary gear set can have components with increased strength. Methods for modifying a transmission to install a reverse clutch and planetary gear set are also provided.