Exhaust Purifier as Dynamic Damper for Powertrain Torsional Vibration
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Solution Overview
Problem
Existing powertrain designs face challenges in reducing torsional vibrations, which can increase weight due to enhanced fastening forces required to mitigate these vibrations, leading to inefficiencies in vibration reduction across the entire powertrain region.
Innovation Solution
The exhaust purifier is designed to function as a dynamic damper by being supported with a first support having lower horizontal direction stiffness, allowing it to swing and absorb torsional vibrations, while a second support limits vibrations in the vehicle height direction, and an auxiliary device is used to further reduce vibrations across the powertrain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the fastening force of bolts is increased to enhance the stiffness of the fastening portion, then the torsional vibration is reduced, but the wall thickness of the fastening portion must be increased, resulting in weight increase
Solution Approach 1:
The exhaust purifier acts as an intermediary dynamic damper between the engine and transmission, absorbing torsional vibrations without requiring enhanced fastening forces or thicker walls at the engine-transmission interface
Solution Approach 2:
The support stiffness parameters are specifically designed to be smaller in the horizontal direction than in the vertical direction, enabling the exhaust purifier to flexibly absorb horizontal torsional vibrations while maintaining vertical stability
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 effectively reduces torsional vibrations throughout the powertrain, from the upper to lower portions, enhancing durability and reducing weight by leveraging the exhaust purifier and auxiliary device as dynamic dampers.
Implementation Method 1
the exhaust purifier functions as a pendulum, where the portion of the exhaust purifier that is located downstream of the support swings with the support being a pivot
Implementation Method 2
the exhaust purifier is utilized as a dynamic damper
Data Source
AI summary
Provided is a powertrain for a vehicle in which an exhaust purifier is utilized as a dynamic damper. The powertrain includes an engine, and a transmission linked to the engine. The engine has an exhaust purification system containing a GPF device for purifying an exhaust gas. The exhaust purification system is disposed along a rear external surface of a cylinder head. The exhaust purification system is supported via a first support on the engine. A vertical side portion of the exhaust purification system is located downstream of the first support in a flow direction of an exhaust gas, extending in a direction away from the external surface.