Rotational Inerter Gear Train Torque Control
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Solution Overview
Problem
Current inerter technologies primarily address linear inputs and lack effective solutions for rotational inputs in mechanical networks, limiting their application in controlling forces in rotational systems such as vehicle suspension and steering systems.
Innovation Solution
A rotational inerter system comprising a first and second shaft with meshing gears and a flywheel, where the rotation of the first shaft causes proportional torque at the second shaft, enabling control of rotational inputs in vehicle components like suspension and steering systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linear inerter designs (rack-and-pinion, ball screw, hydraulic) are used, then linear force control is achieved, but rotational force control capability is lost
Solution Approach 1:
The patent inverts the conventional approach by creating a rotational inerter that directly handles rotational inputs through a rotational mass connected via gears, rather than converting rotational motion to linear motion. This inversion enables direct rotational force control while maintaining the core inerter functionality.
Solution Approach 2:
The rotational inerter design provides multi-functionality by enabling both rotational force control and potential integration into various mechanical networks (suspension, steering, drivetrain), making the device adaptable to multiple applications beyond linear motion control.
2Force
If rotational mass is directly connected to the input shaft, then rotational inertia is provided, but torque amplification and control precision are reduced
Solution Approach 1:
The patent introduces a gear train as an intermediary mechanism between the rotational mass and the input shaft. This intermediary enables torque amplification through gear ratios while maintaining precise control, avoiding the need for direct connection that would limit torque multiplication capability.
3Power
If gear train with high gear ratio is used, then torque amplification is increased, but mechanical efficiency and response speed are reduced
Solution Approach 1:
The patent employs a dynamic gear train configuration that can adapt its characteristics based on operational requirements. The system maintains responsiveness by optimizing the gear ratio selection to balance torque amplification needs with speed response requirements, rather than using a fixed high gear ratio that would compromise speed.
4Reliability
If rotational inerter is integrated into vehicle suspension system, then suspension dynamics are improved, but system complexity and manufacturing cost increase
Solution Approach 1:
The patent segments the rotational inerter into modular components (gear train, rotational mass, mounting interfaces) that can be manufactured separately and assembled into the suspension system. This segmentation facilitates easier manufacturing and integration while maintaining the performance benefits of the rotational inerter in suspension applications.
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 rotational inerter system enhances the control and response of rotating vehicle components by applying torque proportional to the rate of change of angular velocity, improving suspension and steering dynamics.
Implementation Method 1
A flywheel is operatively connected to the second shaft. Rotation of the first shaft causes rotation of the second shaft and the flywheel about the second longitudinal axis.
Implementation Method 2
A torque is applied at the first shaft, the torque is proportional to a rate of change of the angular velocity of the first shaft about the first longitudinal axis.
Implementation Method 3
a second gear operatively connected to the second shaft, where the second gear is in meshing engagement with the first gear, and the second shaft and the second gear are rotatable about the second longitudinal axis
Data Source
AI summary
Rotational inerters are described herein that can provide torque applications in response to a rotation component. The inerter can include a first shaft having a first longitudinal axis and a second shaft having a second longitudinal axis. A first gear can be connected with the first shaft and a second gear can be connected with the second shaft. The first and second gears can be in meshing engagement with one another. In some arrangements, the first gear can be a worm gear and the second gear can be a worm. A flywheel can be connected with the second shaft. Rotation of the first shaft can cause the second shaft to rotate. Arrangements described herein can cause a torque to be applied at the first shaft that is proportional to a rate of change of the angular velocity of the first shaft about the first longitudinal axis.