Torque Converter Oil Path Layout for Open-Clutch Flow Control
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Solution Overview
Problem
Current torque converters do not provide a sufficient flow of oil through the system when the torque converter clutch is open, limiting efficiency.
Innovation Solution
Incorporating a control valve body with specific oil paths and an orifice to manage oil flow, allowing a higher flow when the clutch is open and a measured flow when applied, utilizing a torque converter clutch piston and one-way valves to actuate the clutch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the torque converter clutch is open, then fluid connection between engine and transmission is maintained, but oil flow through the torque converter is insufficient
Solution Approach 1:
The patent divides the oil flow control into multiple separate paths: a first oil path for clutch actuation and a second oil path for torque converter flow control. This segmentation allows independent optimization of each path - the first path ensures reliable clutch engagement while the second path maximizes oil flow through the torque converter when the clutch is open.
Solution Approach 2:
The patent introduces a flow control valve as an intermediary component in the second oil path. This valve acts as a mediator between the hydraulic control system and the torque converter, regulating oil flow to maximize throughput while maintaining system stability and preventing uncontrolled flow variations.
2Quantity of substance
If current torque converter designs are used, then clutch actuation is achieved, but oil flow when clutch is open is not maximized
Solution Approach 1:
The control valve body performs multiple functions: it controls clutch actuation through the first oil path, regulates torque converter flow through the second oil path, and coordinates between these functions. This multi-functionality reduces the need for separate dedicated components for each control function, managing complexity while achieving dual objectives.
Solution Approach 2:
The patent merges the clutch control and torque converter flow control into a single integrated control valve body. By combining these control functions in one component rather than using separate valves, the design achieves high oil flow while managing system complexity through consolidation of control elements.
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
Enhances oil flow through the torque converter when the clutch is open, improving efficiency while maintaining controlled flow when applied, thus optimizing torque converter performance.
Implementation Method 1
the second oil path includes a one-way valve positioned between the second control circuit and the torque converter to prevent oil flow from the second control circuit into the torque converter through the second oil path, and to allow oil flow from the torque converter back to the second control circuit through the second oil path
Implementation Method 2
an orifice that provides a fluid connection between the second control circuit and the torque converter... the orifice is adapted to allow a measured flow of oil to pass therethrough
Implementation Method 3
the third oil path in fluid communication with the piston apply chamber such that when oil flows to the torque converter clutch from the second control circuit through the third oil path, oil fills the piston apply chamber and actuates the torque converter clutch piston to apply the torque converter clutch
Data Source
AI summary
An automatic transmission comprising a control valve body adapted to control oil flow within the transmission, a torque converter having a torque converter clutch operable in one of an open and an applied condition, a first control circuit between the control valve body and the torque converter and a second control circuit between the control valve body and the torque converter, a first oil path that provides a fluid connection between the first control circuit and the torque converter, a second oil path that provides a fluid connection between the second control circuit and the torque converter, a third oil path that provides a fluid connection between the second control circuit and the torque converter clutch, and an orifice that provides a fluid connection between the second control circuit and the torque converter.