Nested Wet Dual Clutch Layout for Higher Torque in Compact Assemblies
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Solution Overview
Problem
The piston type dual clutch device faces challenges in increasing transmission torque of the second clutch assembly without adding friction plates or increasing hydraulic pressure, which complicates assembly and disassembly, and affects fuel efficiency.
Innovation Solution
A dual clutch device design featuring a carrier hub with a flange and integral extensions, allowing for a 'T'-like shape formation, where the first and second carriers have different radii, and pistons are positioned on either side of the flange, with pressure and compensation chambers optimized to secure pressing force without increasing the number of friction plates or hydraulic pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of friction plates in the second clutch assembly is increased to increase transmission torque, then the transmission torque increases, but the axial length of the transmission increases and manufacturing cost increases
Solution Approach 1:
The patent changes the hydraulic pressure parameter acting on the second piston to increase the transmission torque of the second clutch assembly. By increasing the hydraulic pressure in the second pressure chamber, the pressing force on the friction plates is enhanced, thereby increasing torque transmission without adding more friction plates or increasing axial length.
2Force
If the hydraulic pressure acting on the second piston is increased to increase transmission torque, then the transmission torque increases, but fuel efficiency deteriorates due to higher energy consumption
Solution Approach 1:
The patent optimizes the hydraulic pressure parameter in the second pressure chamber to achieve the required transmission torque while minimizing energy consumption. The pressure is increased only when and where necessary (in the second pressure chamber only) to maintain torque transmission during clutch engagement, rather than maintaining high pressure continuously, thereby preserving fuel efficiency.
3Ease of operation
If two separate pressure chambers and two compensation chambers are provided for two pistons, then each piston can be operated independently, but the number of parts increases and assembly and disassembly processes become complicated
Solution Approach 1:
The patent combines the two compensation chambers into a single common compensation chamber that serves both the first and second pistons. This merging reduces the total number of parts while maintaining independent operation of each piston through separate pressure chambers. The common compensation chamber simplifies assembly and disassembly processes while preserving the functional independence of each clutch assembly.
4Volume of moving object
If the second clutch assembly uses a friction plate with small area to match the small radius piston, then the structure is compact, but the transmission torque is reduced by approximately 20%
Solution Approach 1:
The patent changes the hydraulic pressure parameter acting on the second piston to compensate for the small friction plate area. By increasing the pressure in the second pressure chamber, the pressing force on the friction plates is enhanced, thereby maintaining adequate transmission torque despite the smaller clutch assembly size and reduced friction plate area.
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 effectively secures transmission torque for the second clutch assembly with a smaller radius, simplifies assembly and disassembly, and maintains fuel efficiency by avoiding additional friction plates and increased hydraulic pressure.
Implementation Method 1
a second piston with small radius that acts on the second clutch assembly... the method of increasing the pressure of the fluid acting on the second piston
Data Source
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AI summary
The present invention relates to a nested wet dual clutch device. A carrier hub has a flange part extending in a radial direction from the outer peripheral surface thereof. The flange part has a hub-axial extended part extending in an axial direction. A carrier including a first carrier and a second carrier is connected to the flange part through the hub-axial extended part extending in an axial direction. The radii of the hub-axial extended part and a carrier-axial extended part substantially correspond to each other. The outer peripheral surface of a first piston-axial extended part slides along the inner peripheral surface of the carrier-axial extended part in a first compensation chamber, and the inner peripheral surface of the first piston-axial extended part slides along the outer peripheral surface of a rear guide cylinder in a first pressure chamber. The outer peripheral surface of a second piston-inwardly axial extended part slides along the inner peripheral surface of the hub-axial extended part in a second pressure chamber, and the inner peripheral surface of the second piston-inwardly axial extended part slides along the outer peripheral surface of a front guide cylinder in a second compensation chamber.