Flywheel Immobilization Using Elastic Tongue and Locking Tab
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dual mass flywheel immobilization methods using adhesive materials or breakable pins are not fully satisfactory as they can cause debris or pollution, are tedious to install, and lengthen assembly times, potentially interfering with clutch operation or sensors.
Innovation Solution
A temporary immobilization device using elastic tongues and locking tabs that securely hold the secondary flywheel relative to the primary flywheel during assembly, allowing for reliable and simple installation without causing debris or pollution, and can be easily deactivated when the engine is started.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive material or breakable pins are used for temporary immobilization, then the secondary flywheel can be held in position during assembly, but debris or pollution is generated that may interfere with clutch operation or sensor function
Solution Approach 1:
The harmful adhesive material or breakable pins are extracted and replaced with a clean mechanical locking system using elastic tongues and locking tabs that achieve the same immobilization function without generating debris or pollution
Solution Approach 2:
The elastic tongues are designed as temporary, single-use components that serve their immobilization purpose during assembly and then naturally deactivate, equivalent to disposable elements that fulfill their function and are discarded without creating harmful residue
2Reliability
If breakable pins are used for temporary immobilization, then the flywheels can be held in position, but the assembly process becomes tedious and time-consuming
Solution Approach 1:
The elastic tongues are pre-installed on the secondary flywheel in a relaxed state, and the locking tabs are pre-positioned on the primary flywheel, so that when assembled together they automatically engage and lock the relative position without requiring additional assembly steps
Solution Approach 2:
The elastic tongues automatically engage with the locking tabs when the flywheels are brought together, and automatically deactivate when torque is applied during engine startup, eliminating the need for manual intervention or complex assembly procedures
3Reliability
If adhesive material is used for temporary immobilization, then the flywheels can be held in position, but the drying operation lengthens the assembly duration
Solution Approach 1:
The chemical adhesive bonding system is replaced with a purely mechanical locking system using elastic tongues and locking tabs that provides immediate immobilization without requiring drying time or chemical curing processes
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 solution provides a reliable, cost-effective, and efficient method for immobilizing the flywheels during assembly, minimizing interference with clutch operation and reducing assembly time, while ensuring smooth engine startup by using elastic tongues and locking tabs that are designed to be easily overridden by torque once the engine is running.
Implementation Method 1
a temporary immobilization device capable of immobilizing the secondary flywheel relative to the primary flywheel in a determined angular position; the temporary immobilization device comprising an elastic tongue, integral in rotation with one of the primary and secondary flywheels
Implementation Method 2
the elastic tongue being, in said determined angular position, able to assume a hooked position in which it cooperates with the locking lug; the elastic tab being, in said hooked position, constrained against the locking lug so as to exert a retaining force opposing the rotation
Implementation Method 3
when a torque transmitted between the primary flywheel and the secondary flywheel is sufficient to overcome the retaining force exerted by the elastic tab on the locking tab
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a double damper flywheel for a motor vehicle comprising: - a primary flywheel and a secondary flywheel movable in rotation relative to each other around an axis X; - elastic elements interposed between the primary flywheel and the secondary flywheel and capable of transmitting a torque and damping the rotational acyclics between the primary flywheel and the secondary flywheel; and - a temporary immobilization device capable of immobilizing the secondary flywheel relative to the primary flywheel in a determined angular position; said double damper flywheel being characterized in that the temporary immobilization device comprises an elastic tab (25), rotationally fixed to one of the primary and secondary flywheels, and a locking tab (29), rotationally fixed to the other of the primary and secondary flywheels.