Integrated Clutch Drum Design for Transmission Weight Reduction
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Solution Overview
Problem
Conventional transmission devices with multiple clutches have a high number of components, increasing assembly time and weight, while requiring improved accuracy and strength, which is not efficiently addressed by existing designs.
Innovation Solution
The transmission device integrates the cancel oil chamber defining portion with the first clutch drum, reducing the number of components and assembly time, and uses a rib structure in the second clutch drum to enhance strength and positioning accuracy, while allowing for a lightweight material selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the clutch drum of the second clutch is fastened to the clutch drum of the first clutch with rivets, then the structural strength is improved, but the number of components and assembly time increase
Solution Approach 1:
The patent integrates the second clutch drum directly with the first clutch drum by forming the second clutch drum as an integral extension of the first clutch drum structure. This eliminates the need for separate rivets or fastening components, reducing the total number of parts while maintaining structural strength through the unified drum design.
2Strength
If the clutch drum of the second clutch is fastened to the clutch drum of the first clutch with rivets, then the structural strength is improved, but the assembly time increases
Solution Approach 1:
By making the second clutch drum an integral part of the first clutch drum structure, the patent eliminates the need for separate assembly steps involving rivets or other fastening operations. This integration significantly reduces assembly time while ensuring structural integrity through the unified design.
3Productivity
If the number of components is reduced by integrating structures, then the assembly time is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent divides the integrated clutch drum structure into distinct functional portions - the first clutch drum and the second clutch drum - each with specific geometries and features. This segmentation within integration allows for standardized manufacturing processes and reduces the complexity of achieving high precision, as each portion can be manufactured independently with standard tolerances before being combined into the unified structure.
4Strength
If conventional fastening methods are used, then the structural strength is ensured, but the weight of the device increases
Solution Approach 1:
The patent eliminates rivets and other fastening components by integrating the second clutch drum with the first clutch drum into a unified structure. This removal of redundant fastening elements reduces the overall device weight while maintaining structural strength through the continuous, integrated drum design.
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 design reduces the weight and assembly time of the clutches while ensuring strength and accuracy, by integrating the cancel oil chamber and using a rib structure in the clutch drums, thus improving the overall efficiency and performance of the transmission device.
Implementation Method 1
a cancel oil chamber defining portion defining a second cancel oil chamber for canceling centrifugal hydraulic pressure produced in the second engagement oil chamber of the second clutch
Data Source
AI summary
A transmission device that includes a first clutch that includes a first clutch drum, a first piston, and a first engagement oil chamber; and a second clutch that includes a second clutch drum fixed to an outer circumferential portion of the first clutch drum, a second piston, and a second engagement oil chamber.