Selectable Mass Flywheel Locking Mechanism for Powertrain Vibration Control
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Solution Overview
Problem
Conventional single and dual mass flywheels are inadequate in reducing powertrain vibrations, particularly in smaller engines, as they fail to effectively manage engine pulsations and vibrations due to insufficient inertia.
Innovation Solution
A selectable mass flywheel assembly with a first mass connected to the engine crankshaft and a second mass engaging with the clutch, rotationally coupled by a spring and damper assembly, and a locking mechanism that engages both masses during engine startup to minimize vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dual mass flywheel with spring and damper system is used, then torsional vibrations are reduced, but the first mass has lower inertia and is not as effective in reducing engine pulsations and vibrations
Solution Approach 1:
The flywheel system dynamically changes its mass configuration based on operating conditions. During startup, the locking mechanism engages to combine both masses into a single high-inertia unit. During normal operation, the masses can move independently relative to each other through the spring-damper system, providing vibration reduction while maintaining adaptability to different operational requirements.
Solution Approach 2:
A locking mechanism acts as an intermediary between the two masses, enabling them to be connected or disconnected based on operational needs. This intermediary component allows the system to switch between high-inertia mode (both masses locked together) for startup and vibration-reduction mode (masses independent) for normal operation, resolving the contradiction between inertia and vibration reduction.
2Device complexity
If a single mass flywheel is used, then the structure is simple, but it fails to effectively reduce powertrain vibrations in smaller engines
Solution Approach 1:
The flywheel is segmented into two separate masses that can function independently or together. This segmentation allows the system to provide vibration reduction benefits in smaller engines while maintaining a relatively simple overall structure. The first mass handles engine-side vibrations and the second mass handles transmission-side vibrations, with the spring-damper system providing isolation between them.
3Object-affected harmful factors
If the locking mechanism engages both masses during startup, then vibrations and pulsations are minimized, but the device complexity increases
Solution Approach 1:
The locking mechanism is designed to engage and disengage automatically based on engine operating conditions, reducing the need for complex external control systems. The mechanism self-regulates by responding to parameters such as engine speed or torque demand, engaging during startup when high inertia is needed and disengaging during normal operation when vibration reduction is prioritized, thereby minimizing vibrations without requiring overly complex control architecture.
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 locking mechanism significantly reduces engine vibrations and pulsations by increasing rotational inertia, stabilizing combustion and reducing vibration modes in the powertrain by a factor of three during engine startup.
Implementation Method 1
The two masses are rotationally coupled to each other with a spring and damper assembly
Implementation Method 2
The two masses are rotationally coupled to each other with a spring and damper assembly
Implementation Method 3
The locking mechanism engages both masses during the startup of the engine to lock the two masses together to minimize the vibrations and pulsations in the powertrain during startup of the engine
Data Source
AI summary
A selectable mass flywheel assembly for a powertrain of a motor vehicle includes a first mass and a second mass. The first mass is connected to a crankshaft of an engine and the second mass engages with a clutch to transfer torque from the engine to a transmission. The two masses are rotationally coupled to each other with a spring and damper assembly. The flywheel assembly further includes a locking mechanism that engages both masses during the startup of the engine to lock the two masses together to minimize the vibrations and pulsations in the powertrain during startup of the engine.