Clutch Drum Fastening for Compact Transmission Design
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Solution Overview
Problem
The existing transmission devices with a second clutch drum fixed by a snap ring suffer from increased axial length, which hinders the achievement of a compact design and allows deformation of the clutch drum due to torsional moments.
Innovation Solution
The second clutch drum is fastened to the first clutch drum, eliminating the need for a snap ring and reducing axial length, while the cancel plate is positioned between the clutch drums to align the fulcrum and force points of torsional moments, thereby suppressing deformation and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the second clutch drum is fixed by a snap ring to the drum portion, then the strength of the drum portion is ensured, but the axial length of the clutch drum increases
Solution Approach 1:
The patent merges the second clutch drum with the drum portion by directly fastening them together, eliminating the need for a separate snap ring and its associated groove. This integration reduces the axial length while maintaining structural strength through the direct fastening connection between the clutch drum and drum portion.
2Stability of the object's composition
If the cancel plate is positioned to align fulcrum and force points of torsional moments, then deformation of the clutch drum is suppressed, but the structural complexity increases
Solution Approach 1:
The cancel plate serves as an intermediary element positioned between the first and second clutch drums. By strategically positioning this plate, the patent creates a fulcrum point that aligns with the force point of torsional moments, thereby suppressing deformation of the clutch drum through this intermediate structural element.
3Volume of moving object
If the second clutch is disposed circumferentially inward of the first clutch, then the overall size is reduced, but the axial length must be increased to accommodate the snap ring groove
Solution Approach 1:
The patent combines the second clutch disposition circumferentially inward with the elimination of the snap ring groove by directly fastening the clutch drums together. This merging of approaches allows the compact circumferential arrangement to be maintained without the axial length penalty that would otherwise be required for snap ring accommodation.
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 configuration results in a more compact transmission device with reduced deformation and hydraulic oil leakage, achieving a stronger and more compact design by aligning the torsional moments and eliminating the need for additional structural components.
Implementation Method 1
a first cancel plate that defines together with the first clutch piston a first cancel oil chamber that cancels centrifugal hydraulic pressure
Implementation Method 2
a first clutch piston that is axially movable by hydraulic pressure supplied to a first engagement side oil chamber
Data Source
AI summary
A transmission device includes a first clutch and a second clutch that is disposed circumferentially inward of the first clutch so as to overlap with the first clutch as viewed from a radial direction. The first clutch includes a first clutch drum, a first clutch piston that is axially movable by hydraulic pressure supplied to a first engagement side oil chamber on an inner circumferential side of the first clutch drum, and a first cancel plate that defines together with the first clutch piston a first cancel oil chamber that cancels centrifugal hydraulic pressure. The first cancel plate is fastened between the first clutch drum and a second clutch drum of the second clutch.