Double-Piston Clutch Structure for Hysteresis-Free Torque Release
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Solution Overview
Problem
Existing clutch devices for motor vehicles experience hysteresis issues during torque transmission and release, leading to inefficiencies and increased complexity due to separate components and required connecting means, which result in energy losses and delayed control responses.
Innovation Solution
A clutch device design featuring a primary piston and secondary piston connected via a spring element, such as a bellows or coil spring, which are integral components, allowing for hysteresis-free control by eliminating the need for separate connecting means and ensuring immediate torque release without energy loss, achieved through the integral design and fluid-tight sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate components and connecting means are used to connect the primary piston and secondary piston, then the clutch device can be assembled from modular parts, but the device complexity increases and energy losses occur due to connecting means
Solution Approach 1:
The patent merges the primary piston and secondary piston into a single integral component, eliminating the need for separate connecting means. This reduces the number of parts and assembly steps while maintaining the functional benefits of having both pistons in the clutch device.
2Ease of manufacture
If separate components and connecting means are used to connect the primary piston and secondary piston, then the clutch device can be assembled from modular parts, but energy losses occur due to connecting means
Solution Approach 1:
The patent merges the primary piston and secondary piston into a single integral component, eliminating the need for separate connecting means. This reduces the number of parts and assembly steps while maintaining the functional benefits of having both pistons in the clutch device.
3Device complexity
If conventional clutch devices are used, then the structure is simpler without integral components, but hysteresis occurs leading to delayed control response
Solution Approach 1:
The patent merges the primary piston and secondary piston into a single integral component, eliminating the need for separate connecting means. This reduces the number of parts and assembly steps while maintaining the functional benefits of having both pistons in the clutch device.
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 integral design simplifies manufacturing, reduces component complexity, and enables immediate and efficient torque release, enhancing control behavior by minimizing hysteresis and energy losses, while maintaining fluid-tightness and force transmission efficiency.
Implementation Method 1
the spring element, which is still tensioned at this moment, causes the primary piston to move away from the disc pack without any time delay
Implementation Method 2
A hydraulic pressure medium can be pressed into the primary pressure chamber so that an axial displacement of the primary piston, which causes the compression of the disc pack, is controlled
Implementation Method 3
The discs can be brought into a frictional connection, in particular a frictional engagement, by means of the actuation device in order to transmit the torque
Data Source
AI summary
A clutch device for a motor vehicle includes a disc pack and an actuation device. The disc pack includes an outer disc pack and an inner disc pack arranged. The actuation device includes a retaining element, a primary piston, a secondary piston and a spring element. The primary piston and the secondary piston are each arranged on the retaining element in an axially displaceable manner and delimit respective pressure chambers. The spring element is integrally formed with the secondary piston and connects the primary and secondary pistons. When a pressure is applied to a pressure medium in the primary pressure chamber, the primary piston is arranged to move the outer disc pack against the inner disc pack and frictionally transmit torque. When a pressure is applied to a pressure medium in the secondary pressure chamber, the secondary piston is arranged to move the primary piston against the outer disc pack.