68RFE Input Drum Assembly With Oil-Channel Cooling for Higher Torque
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Solution Overview
Problem
The traditional input drum assembly in 68RFE transmissions experiences overheating due to inefficient heat transfer, leading to deformation of clutch friction discs, reduced torque capacity, and shortened gearbox service life.
Innovation Solution
The improved input drum assembly includes a piston cap and piston body with bolts for fixed connection, increasing the mounting space for clutch plates and friction discs, and features retainer and piston body oil holes for enhanced lubrication and cooling. Additionally, the transmission housing is modified with a reinforcing rib and increased oil flow channels to improve heat dissipation and torque capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the traditional input drum assembly structure is used, then the assembly is simple in structure, but heat transfer efficiency is poor leading to overheating
Solution Approach 1:
The piston is divided into two separate components: a piston cap and a piston body. These are connected through bolt holes that allow cooling oil to flow through, creating internal cooling channels. This segmentation enables improved heat transfer from the clutch friction discs to the cooling oil without requiring a completely redesigned assembly structure.
Solution Approach 2:
Cooling oil serves as an intermediary medium to transfer heat away from the clutch friction discs. The oil flows through the bolt holes in the piston cap and piston body, absorbing heat from the friction discs and carrying it away. This intermediary cooling mechanism efficiently removes heat without directly modifying the friction disc structure.
2Force
If the number, thicknesses or diameters of clutch plates and friction discs are increased to improve torque capacity, then torque bearing capacity increases, but the existing structure cannot accommodate these changes
Solution Approach 1:
The piston assembly is transformed from a rigid, fixed-structure component to a more dynamic configuration with separate piston cap and body that can accommodate varying numbers and thicknesses of clutch plates and friction discs. The bolt-connected design allows for flexibility in adjusting the clutch pack composition to optimize torque capacity for different application requirements.
Solution Approach 2:
The design allows for variations in the axial dimension (thickness) and radial dimension (diameter) of clutch plates and friction discs by providing sufficient space within the clutch retainer. The separated piston structure creates additional clearance that enables increasing the number of friction discs or their individual dimensions without interfering with the housing structure.
3Temperature
If cooling oil flow is increased to improve heat dissipation, then overheating is reduced, but oil flow path blockage from carbon deposits occurs
Solution Approach 1:
The cooling oil flow paths are extracted and routed through the piston cap and piston body bolt holes, separating the cooling function from the clutch engagement function. This extraction allows the cooling oil to flow through dedicated channels that are less susceptible to blockage from carbon deposits generated during clutch operation.
Solution Approach 2:
The design changes the flow path parameters by creating direct channels through the piston components. This alters the oil flow characteristics, enabling better heat dissipation while the controlled flow paths reduce turbulence and minimize the risk of carbon deposit accumulation and blockage.
4Ease of manufacture
If the piston cap and piston body are separately connected with bolts, then manufacturing and assembly flexibility is improved, but the number of parts increases
Solution Approach 1:
The piston is segmented into a piston cap and piston body that are separately manufactured and then assembled using bolts. This segmentation allows each component to be manufactured independently with optimized processes, and facilitates easier replacement or repair of individual components without replacing the entire piston assembly.
Solution Approach 2:
The piston cap and piston body are merged through bolted connection to form a functional unit that performs both clutch engagement and cooling functions. While the number of parts increases, the merging of these two components creates a more versatile assembly that integrates structural support with thermal management capabilities.
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 upgraded input drum assembly and transmission housing design significantly improve heat transfer and lubrication, reducing the risk of overheating, increasing torque capacity, and extending the service life of the gearbox.
Implementation Method 1
A wall of the barrel of the piston body is provided with a plurality of piston body oil holes; a wall of the clutch retainer is provided with a plurality of retainer oil holes; and the retainer oil holes are in one-to-one correspondence with the piston body oil holes
Implementation Method 2
the upgraded input drum assembly and transmission housing design significantly improve heat transfer and lubrication
Implementation Method 3
features retainer and piston body oil holes for enhanced lubrication and cooling
Data Source
AI summary
Disclosed are an input drum assembly for improving performance of a 68RFE transmission and a method. The cooling and lubricating efficiencies of the input drum assembly in the 68RFE transmission can be improved by an input drum assembly and/or transmission housing; mounting spaces of clutch plates and clutch friction discs can be increased by the input drum assembly, so that thicknesses of the clutch plates 14 and discs or the number thereof can be increased, and a torque borne by the 68RFE transmission can be increased finally; a reinforcing rib is increased when the transmission housing is cast, so that the overall strength of the transmission housing can be enhanced; and an inner wall is cut after the transmission housing is cast, so that a diameter of the input drum assembly can be increased, thereby increasing diameters of the clutch plates and discs, and finally increasing the torque.