Engine Mount Sub-Rod for NVH and Weight Trade-Off
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Solution Overview
Problem
The three-point mounting scheme for vehicle engines is limited in supporting power train movement and suppressing noise, vibration, and harshness (NVH), leading to increased fatigue and manufacturing costs, while the four-point scheme offers better NVH performance but at the expense of increased vehicle weight.
Innovation Solution
A structure that includes a sub-roll rod with one end connected to a subframe and the other to a bearing bracket, using larger bushings to efficiently support the power train and improve NVH performance, similar to a four-point mounting scheme, while maintaining a lighter subframe and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a four-point mounting scheme is used, then NVH performance is improved, but vehicle weight increases
Solution Approach 1:
The patent divides the power train support function into multiple independent mounting points (engine mount, transmission mount, front roll rod, rear roll rod) that can be selectively configured. This segmentation allows the system to achieve four-point support for high-torque engines while maintaining three-point support for low-torque engines, optimizing NVH performance without universally increasing vehicle weight.
Solution Approach 2:
The patent implements a dynamic mounting configuration where the number of support points adapts based on engine torque requirements. High-torque engines receive four-point support for superior NVH control, while low-torque engines use three-point support to minimize weight. This dynamic adaptation resolves the contradiction by making the support system flexible rather than fixed.
2Weight of stationary object
If a three-point mounting scheme is used, then vehicle weight is reduced, but power train support capability and NVH suppression are insufficient
Solution Approach 1:
The patent applies different mounting configurations to different engine types based on their specific torque requirements. High-torque engines receive enhanced four-point support with additional roll rods, while low-torque engines use simpler three-point support. This local quality approach ensures each engine receives appropriate support capability without unnecessarily increasing overall vehicle weight.
Solution Approach 2:
The patent changes the mounting configuration parameter (number of support points) based on engine torque parameters. When engine torque exceeds a threshold, the system transitions from three-point to four-point mounting, adding roll rods to enhance support capability. This parameter-based adaptation resolves the contradiction by matching support capability to actual engine requirements.
3Object-affected harmful factors
If a four-point mounting scheme is used, then NVH performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements differentiated mounting systems where only high-torque engines receive the more complex four-point support configuration, while low-torque engines use the simpler three-point configuration. This local quality approach ensures enhanced NVH performance is provided only where necessary, reducing overall manufacturing costs while maintaining adequate support for all engine types.
Solution Approach 2:
The patent uses engine torque as a parameter to determine the mounting configuration level. When torque requirements are high, the system activates the four-point mounting mode with additional roll rods; when torque requirements are low, it uses three-point mounting. This parameter-driven selection optimizes manufacturing cost by avoiding unnecessary components in low-torque applications.
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 solution enhances the support of the power train and improves NVH performance, maintaining a lighter subframe and reducing manufacturing costs, while allowing for a unified platform for vehicles with various torque engines, thus increasing manufacturing efficiency.
Implementation Method 1
using larger bushings to efficiently support the power train and improve NVH performance
Data Source
AI summary
A structure of an engine mount is provided for a vehicle in which an engine is disposed in the front of the vehicle, a front wheel is driven, and the engine is integrally coupled with a transmission to be seated horizontally on a vehicle body in a transverse mounting direction. The structure may include a driveshaft coupled to receive the driving force of the engine through the transmission and penetrate a center bearing through a bearing bracket fixed to the engine, a subframe as a plate shape coupled to the vehicle body in a rear lower part of the engine and coupled to a lower part of the transmission through a main roll rod mounted on the front, and a sub-roll rod having one end connected to the subframe and the other end connected to the bearing bracket.