Forward Piston Sleeve Reinforcement for Transmission Input Housing
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Solution Overview
Problem
The input housing in high-performance automatic transmissions, such as the General Motors 4L60 series, experiences failures at the splined connection due to excessive torque levels, particularly in the forward piston area, despite aftermarket upgrades that strengthen the overrun piston region, leading to a shift in failure to the forward piston area.
Innovation Solution
A kit is introduced that includes a forward piston sleeve and a replacement forward piston with a larger inner diameter, along with seals, to enhance the strength of the input housing at the forward piston region, compatible with aftermarket overrun piston sleeve upgrades, ensuring the transmission can handle torque levels beyond original design specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If an aluminum input housing is used to reduce weight, then the weight decreases and manufacturing cost reduces, but the torque capacity and strength at the splined connection decrease leading to failure under high torque
Solution Approach 1:
The patent combines aluminum housing with steel sleeves to create a composite structure. The steel sleeves are pressed into the aluminum input housing at critical splined connection areas (overrun piston and forward piston regions) to provide localized high-strength reinforcement while maintaining the overall lightweight aluminum construction and fluid passage integration.
2Strength
If a steel sleeve is added to strengthen the overrun piston area, then the torque capacity at the overrun piston increases, but the failure shifts to the forward piston area
Solution Approach 1:
The patent applies different material properties to different locations within the housing. Steel sleeves are strategically positioned at both the overrun piston area and forward piston area where high stress concentrations occur during torque transmission, providing localized reinforcement exactly where needed while maintaining aluminum construction in other areas.
3Ease of manufacture
If the input housing is designed for original torque specifications, then manufacturing cost and complexity are reduced, but the housing fails under increased torque in high-performance applications
Solution Approach 1:
The reinforcement strategy divides the housing into separate functional zones: aluminum sections for general structural support and fluid passages, and steel sleeve sections for critical torque transmission areas. The steel sleeves are installed as separate press-fit components into pre-formed recesses in the aluminum housing, allowing modular reinforcement without complete housing redesign.
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 kit significantly increases the torque capacity of the input housing at the forward piston area, preventing failures and maintaining clutch pack functionality, while accommodating higher torque levels in high-performance applications.
Implementation Method 1
a steel forward piston sleeve pressed onto the input housing in the forward piston area to increase the housing strength
Implementation Method 2
Fluid pressure is exerted on pistons to apply (engage) the clutch packs
Implementation Method 3
The seals slide on smooth surfaces at locations along diameters of the housing and along the inner diameters of mating components
Data Source
AI summary
A kit for modifying a transmission input housing includes an overrun piston sleeve positioned on an outer surface of an input housing inner stepped portion, an overrun piston configured to mate with the overrun piston sleeve, and a replacement forward piston housing. An inner diameter of the overrun piston is larger than an inner diameter of an OE overrun piston. A forward piston sleeve is positioned on the outer surface of the input housing inner stepped conical portion adjacent the overrun sleeve. A forward piston mates with the forward piston sleeve. The forward piston has an inner diameter that is larger than an inner diameter of an OE forward piston. Seals are positioned between the forward piston and the forward piston sleeve and between the overrun piston and the forward piston at an outer diameter of the overrun piston.