Pendulum Powerplant Mount Layout With Split Torque Rod Stiffness
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Solution Overview
Problem
The pendulum type mount system for powerplant units on vehicles does not effectively suppress vibrations and noises caused by internal combustion engines, as existing configurations primarily focus on collision safety without adequate consideration for vibration and noise reduction.
Innovation Solution
A pendulum type mount system featuring a pair of upper mounts and first and second lower torque rods, where the first lower torque rod has a higher spring constant than the second, and are positioned on opposite sides of the powerplant unit's gravity center, with the first torque rod having stoppers to restrict swinging and the second torque rod maintaining a lower spring constant to distribute reactive torques effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single lower torque rod configuration is used, then collision safety is improved, but vibration suppression capability deteriorates
Solution Approach 1:
The single lower torque rod is segmented into two separate torque rods (first and second lower torque rods) positioned on opposite sides of the powerplant unit. This segmentation allows each rod to independently manage collision protection while collectively providing vibration suppression through distributed mounting points and differential spring constants.
Solution Approach 2:
Different spring constants are assigned to different torque rods based on their local requirements. The first lower torque rod has a higher spring constant for stiffer support, while the second has a lower spring constant for better vibration isolation. This local differentiation optimizes both collision safety and vibration suppression in specific regions.
2Object-affected harmful factors
If torque rods are positioned closer to the gravity center, then vibration suppression is improved, but layout flexibility deteriorates
Solution Approach 1:
The torque rods are positioned asymmetrically with respect to the gravity center plane. The first torque rod is positioned at a first distance from the reference plane, while the second is positioned at a second distance, creating an asymmetric configuration that optimizes vibration suppression while accommodating layout constraints.
3Ease of manufacture
If equal spring constants are used for both torque rods, then manufacturing simplicity is improved, but vibration suppression effectiveness deteriorates
Solution Approach 1:
Different spring constants are assigned to different torque rods based on their local requirements. The first lower torque rod has a higher spring constant for stiffer support, while the second has a lower spring constant for better vibration isolation. This local differentiation optimizes both collision safety and vibration suppression in specific regions.
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 effectively suppresses vibrations and noises by distributing reactive torques and maintaining a balanced leverage relationship, enhancing vibration suppression and noise reduction while allowing for flexible layout design and reduced contact with surrounding components.
Implementation Method 1
insulators are embedded in engine mounts, such as the upper mounts and the lower torque rod described above, to suppress transmission of the vibrations to the vehicle body
Implementation Method 2
A first spring constant of the first lower torque rod is not smaller than a second spring constant of the second lower torque rod
Implementation Method 3
upper left and right portions of the powerplant unit is mounted on the vehicle body so as to hang down the powerplant unit. Reactive torques from tires and drive shafts act on the hung-down powerplant unit, and thereby it swings while its upper mounts function as support points
Data Source
AI summary
A pendulum type mount system includes a pair of upper mounts that mount upper portions of a powerplant unit on a vehicle body, and a pair of first and second lower torque rods. The first and second lower torque rods are located on opposite sides to each other with respect to a reference plane including a gravity center of the powerplant unit. A first spring constant of the first lower torque rod is not smaller than a second spring constant of the second lower torque rod. A distance between a first plane including the first lower torque rod and the reference plane is not larger than a distance between a second plane including the second lower torque rod and the reference plane.