Front Driveline Isolation Mounting for Powersports NVH Control
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Solution Overview
Problem
Existing drivelines for vehicles, particularly Powersports vehicles, face challenges in effectively managing vibration and reaction forces, which can lead to increased noise, vibration, and harshness (NVH) as well as reduced durability.
Innovation Solution
The implementation of a driveline system that utilizes isolation mounts with specific configurations, including collars positioned at extreme lateral locations relative to the front drive, and isolation grommets, sleeves, and tubes to absorb and distribute torque and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional driveline is used, then power transmission is achieved, but vibration and reaction forces are transmitted to the frame
Solution Approach 1:
The patent introduces isolation mounts as intermediary elements positioned between the driveline and the frame. These mounts serve as mediators that decouple the direct connection, allowing the driveline to transmit power while the isolation mounts absorb and dampen vibration and reaction forces, preventing their transmission to the frame and improving both NVH characteristics and durability
Solution Approach 2:
The patent converts the harmful vibration and reaction forces generated by the driveline into beneficial damping effects. The isolation mounts are designed to absorb these harmful forces and dissipate them through material damping and controlled deformation, transforming what would be harmful vibrations into a protective mechanism that enhances overall system durability and comfort
2Object-affected harmful factors
If isolation mounts are added to reduce vibration, then NVH characteristics improve, but device complexity increases
Solution Approach 1:
The patent merges the isolation mount functionality with the existing driveline mounting structure. Rather than adding completely separate vibration isolation systems, the design integrates isolation features into the mounting brackets and fastening points, combining structural support and vibration isolation functions into unified components that reduce overall system complexity
Solution Approach 2:
The patent employs flexible isolation elements such as rubber mounts and elastomeric dampers that function as flexible shells between rigid components. These flexible elements provide effective vibration isolation while maintaining a compact, simple structural form that does not significantly increase device complexity
3Force
If collars are positioned at extreme lateral locations, then reaction forces are minimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric positioning of collars at extreme lateral locations on the driveline housing. This asymmetric configuration is specifically designed to create favorable force distribution patterns that minimize reaction forces at the mounting points. The asymmetric design, while requiring precise manufacturing, creates a mechanical advantage that significantly reduces the magnitude of reaction forces transmitted to the frame
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 effectively minimizes reaction forces and reduces vibration transmission to the vehicle frame and driver, thereby enhancing the NVH characteristics and extending the lifespan of the driveline components.
Implementation Method 1
isolation mounts to reduce vibration of the drive through the frame
Implementation Method 2
isolation grommets, sleeves, and tubes to absorb and distribute torque and vibration
Data Source
AI summary
A Powersports vehicle is disclosed which includes a frame, ground engaging members supporting the frame, comprising at least two front wheel, and a power source for driving the front wheels. A front drive is coupled to the power source and to the front wheels, the front drive being coupled to the frame through isolation mounts to reduce vibration of the front drive through the frame.