Powertrain Mounting Bracket Repositioning for NVH
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Solution Overview
Problem
Conventional powertrain mounting systems for motor-driven vehicles, such as hydrogen fuel cell or electric vehicles, face challenges with limited installation space for hoses and pipes due to the placement of brackets and insulators, and a height difference between the powertrain's center of gravity and insulators, leading to compromised vibration insulation and increased noise, vibration, and harshness (NVH) performance.
Innovation Solution
A mounting system that reconfigures the placement of vehicle body-side brackets and insulators to extend outward from the vehicle body frames, reducing the height difference between the powertrain's center of gravity and insulators, allowing for more space within the frames for hoses and pipes, and utilizing multiple mounting units to effectively support the powertrain and reduce displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vehicle body-side bracket and insulator are located within the inner space of the vehicle body frame, then the mounting system can be compact, but there is insufficient room for cooling water hoses, pipes, and high voltage cables
Solution Approach 1:
The vehicle body-side bracket is repositioned from an internal arrangement to an external arrangement on the outer surface of the vehicle body frame. This spatial reconfiguration in a different dimension (from inside to outside the frame structure) creates sufficient clearance within the inner space for routing cooling water hoses, pipes, and high voltage cables, while the bracket itself is adapted to be fixed on the external surface
2Reliability
If there is a height difference between the positions of the insulators and the center of gravity of the powertrain, then the mounting system can be simplified, but vibration insulation performance is greatly deteriorated
Solution Approach 1:
The position of the insulator is adjusted vertically to minimize the height difference with respect to the center of gravity of the powertrain. By changing the positional parameter (vertical location) of the insulator component, the system achieves improved vibration insulation performance while maintaining a relatively simple mounting structure
3Adaptability or versatility
If the mounting system is designed for diesel engine vehicles with engine, transmission, etc., then it can support traditional powertrains, but it is not suitable for motor-driven vehicles with motor and reducer
Solution Approach 1:
The mounting system is redesigned with a universal configuration that can accommodate different powertrain types. The vehicle body-side bracket fixed on the outer surface and the powertrain-side bracket fixed on the motor or reducer create a flexible mounting architecture that works for both traditional diesel engine powertrains and modern motor-driven powertrains, eliminating the need for type-specific mounting designs
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 sufficient installation space for hoses and pipes, reduces the height difference between the powertrain and insulators, effectively controlling the powertrain's displacement and significantly improving NVH performance by minimizing vibration and noise.
Implementation Method 1
an insulator installed between the vehicle body-side bracket and the powertrain-side bracket and configured to insulate a vibration
Data Source
AI summary
A mounting system for a powertrain of a vehicle may secure a sufficient installation space inside of vehicle body frames and greatly reduce a height difference between the center of gravity of a motor-reducer assembly and insulators, thus greatly improving NVH performance of the vehicle. The mounding system includes: mounting units to mount the powertrain of the vehicle to the vehicle body frames. Each mounting unit includes: a vehicle body-side bracket coupled to the vehicle body frame, a powertrain-side bracket coupled to the powertrain, and an insulator installed between the vehicle body-side bracket and the powertrain-side bracket. The vehicle body-side bracket as coupled to an outer surface of the vehicle body frame extends downwards from the vehicle body frame, and thus, the vehicle body-side bracket and the insulator are located in an outer space of the vehicle body frame.