Vehicular Power Unit Mounts Aligning Roll with Body Stability
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Solution Overview
Problem
Conventional vehicle power unit supporting apparatuses fail to adequately enhance driving stability and riding comfort, particularly when a transversely-mounted power unit is installed, as they do not effectively manage the centrifugal forces and load distribution during vehicle turns, leading to potential cancellation of vehicle body rolls by power unit rolls.
Innovation Solution
The apparatus features left and right side mounts positioned higher than the power unit's center of gravity, with inclined spring axis lines intersecting above the center of gravity, allowing the elastic center to be set lower, thereby adjusting the moment direction to align with vehicle body rolls, thus suppressing the influence of power unit behavior on vehicle stability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the spring axis lines of the side mounts are positioned vertically, then the structure is simple and easy to manufacture, but the elastic center cannot be set lower than the center of gravity, causing the power unit roll to cancel vehicle body roll during turns
Solution Approach 1:
The spring axis lines of the left and right side mounts are designed to be inclined rather than vertical, creating an asymmetric configuration. This asymmetry allows the elastic center to be positioned lower than the power unit center of gravity, ensuring that the power unit roll direction aligns with the vehicle body roll direction during turns, thereby preventing roll cancellation and enhancing driving stability.
2Stability of the object's composition
If the spring axis lines intersect at a position higher than the center of gravity, then the elastic center can be set lower, but the mount structure becomes more complex
Solution Approach 1:
The spring axis lines are designed to intersect at a point higher than the power unit center of gravity when viewed from the front, utilizing the vertical dimension to position the elastic center lower. This spatial arrangement in three dimensions allows the elastic center to be positioned optimally for ride comfort while managing the structural complexity through geometric configuration rather than additional components.
3Force
If conventional mount configurations are used, then the power unit is supported, but the centrifugal force during turns causes power unit roll that cancels vehicle body roll, reducing stability
Solution Approach 1:
The inclined spring axis lines create a counterbalancing effect against the centrifugal force during turns. By positioning the elastic center lower than the power unit center of gravity through the inclined mount configuration, the system generates a restoring moment that counteracts the roll induced by centrifugal force, preventing the power unit roll from canceling the vehicle body roll and thereby maintaining vehicle stability during turning maneuvers.
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 enhances driving stability and riding comfort by ensuring the power unit's roll direction aligns with the vehicle body's, preventing cancellation of vehicle body rolls and maintaining stability during turns.
Implementation Method 1
left and right side mounts respectively disposed on both sides in a vehicle width direction of the power unit at a position higher than a position of a center of gravity of the power unit, wherein a spring axis line of the left side mount and a spring axis line of the right side mount are inclined to intersect with each other at a position higher than the position of the center of gravity of the power unit
Implementation Method 2
when the vehicle is turned to the left or right, a centrifugal force is applied to the vehicle 200 during the turn thereof. At that time, the centrifugal force is also applied to the power unit 203
Data Source
AI summary
A vehicle power unit supporting apparatus supports a transversely-mounted power unit having a power source and a speed reduction gear connected to each other. The power unit is supported on a vehicle body by at least a power-source-side mount and a speed-reduction-gear side mount on both of the left and right sides in the vehicle width direction. These mounts are disposed at a position higher than a position of the center of gravity of the power unit. Spring axis lines of the power-source side mount and the speed-reduction-gear side mount are inclined to intersect with each other at a position higher than the position of the center of gravity of the power unit when the vehicle is viewed from the front. An elastic center of the entire power unit supporting apparatus is located at a position lower than the position of the center of gravity of the power unit.