Rear Engine Mount Assembly for Off-Road NVH and Stability
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Solution Overview
Problem
Off-road vehicles face challenges in balancing stability and controlling Noise, Vibration, and Harshness (NVH) due to the tight space constraints and high impact forces encountered in variable terrain.
Innovation Solution
A rear mount assembly is introduced, comprising a rear mount bracket, a rear transverse bar, and a pair of rear isolators, which securely attaches the engine and transmission assembly to the vehicle frame, thereby improving stability and reducing NVH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the engine is placed towards the rear end of the vehicle to provide stability, then vehicle stability is improved, but the space for engine mounting becomes constrained
Solution Approach 1:
The engine mounting system is divided into multiple components: a rear mount bracket attached to the engine, a rear transverse bar attached to the bracket, and rear isolators attached to the bar. This segmentation allows each component to be optimized independently for space efficiency and stability.
Solution Approach 2:
The mounting system utilizes three-dimensional space efficiently by arranging components in multiple dimensions - the bracket extends vertically with supporting flanges, the transverse bar spans laterally, and isolators provide vertical isolation. This dimensional arrangement maximizes stability within limited rear engine space.
2Strength
If a strong frame structure is used to withstand high impact forces, then vehicle resilience is improved, but the complexity of the mounting system increases
Solution Approach 1:
Rear isolators serve as intermediary elements between the engine mounting system and the vehicle frame. These isolators absorb and dampen impact forces, protecting the frame from direct high-frequency vibrations while simplifying the overall mounting structure.
Solution Approach 2:
The mounting system employs composite construction combining rigid components (bracket and transverse bar for structural strength) with flexible isolators (for vibration damping). This composite approach achieves both strength and vibration control without excessive complexity.
3Object-affected harmful factors
If multiple mounting components are used to control NVH, then noise and vibration control is improved, but the device complexity increases
Solution Approach 1:
The rear mount bracket and rear transverse bar are merged into an integrated assembly that functions as a unified mounting structure. This merging reduces the number of separate components while maintaining effective NVH control through the combined action of the bracket, bar, and isolators.
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 enhances the stability of off-road vehicles and improves the distribution of NVH, resulting in a smoother riding experience and better control over the vehicle, even in rough terrain.
Implementation Method 1
a pair of rear isolators configured to be attached to the rear transverse bar
Data Source
AI summary
The present disclosure relates to an off-road vehicle having different features such as an engine assembly, a frame having a frame structure, and a rear mount assembly facilitating easy installation of the engine assembly, and a method of installing the engine assembly. Embodiments of the present disclosure also describe a removable frame member facilitating the installation of the engine assembly from a seating area into a rearward portion of the vehicle. The removable frame member is positioned at least partially forward of the installed engine assembly and in a lateral direction of the vehicle. The frame structure and the rear mount assembly provide more efficient assembly of the engine and transmission assembly into a tight space envelope.