Torque Rod Actuator for High-Frequency Vibration Cancellation
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Solution Overview
Problem
Existing torque rods, such as the fluid-filled anti-vibration connecting rod, fail to effectively attenuate high-frequency vibrations and can experience clogging issues, leading to inadequate vibration suppression, particularly in engine mounting systems where various input vibrations need to be managed.
Innovation Solution
A torque rod with actively controlled vibration cancellation means, featuring a linearly movable actuator and mass members with different spring constants, is used to absorb and cancel input vibrations by reciprocating mass members in a phase opposite to the input vibration, effectively reducing vibration transmission between the vibration-generating and vibration-receiving sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluid-filled anti-vibration connecting rod is used to attenuate vibration through liquid flow in an orifice passage, then vibration attenuation is demonstrated through resonance action, but high-frequency vibrations cause clogging of the incompressible liquid in the orifice passage, hindering sufficient anti-vibration effects
Solution Approach 1:
The patent replaces the mechanical liquid flow system with an electromagnetic vibration cancellation system. An actuator generates a cancellation force based on detected vibration signals, eliminating the need for liquid flow through an orifice passage and thus preventing clogging while maintaining vibration attenuation effectiveness across all frequency ranges
Solution Approach 2:
The patent introduces a fluid (liquid or gas) filled chamber that communicates with the interior of the elastic bush. The fluid provides additional damping through its compressibility and flow characteristics, supplementing the elastic bush's vibration attenuation without relying on restricted orifice passages that are prone to clogging
2Reliability
If the torque rod demonstrates low rigidity to suppress input vibration during normal driving, then riding comfort is improved, but the torque rod cannot sufficiently reduce engine displacement magnitude when large input forces are applied
Solution Approach 1:
The patent implements a dynamic rigidity system where the torque rod's stiffness characteristics can adapt to different operating conditions. The elastic bush and fluid-filled chamber provide non-linear damping characteristics that allow the system to be compliant under normal vibrations while maintaining structural integrity under large loads
Solution Approach 2:
The torque rod employs a composite structure combining rigid connecting rod material with compliant elastic bush and fluid damping elements. This composite approach allows the rigid portions to handle large input forces while the compliant elements provide vibration suppression, resolving the contradiction between rigidity and vibration attenuation
3Reliability
If an actively controlled vibration cancellation means is introduced to consistently attenuate various input vibrations, then vibration control performance is improved, but the device complexity increases with additional actuators and control systems
Solution Approach 1:
The patent incorporates a feedback control mechanism where vibration detection means monitor the input vibrations and the actuator adjusts the cancellation force based on these detected signals. This feedback loop enables consistent vibration attenuation across varying operating conditions while maintaining a relatively simple control structure
Solution Approach 2:
The vibration cancellation system is designed to automatically respond to detected vibrations without requiring complex external control intervention. The actuator self-adjusts based on the detected vibration characteristics, reducing the need for sophisticated control algorithms and simplifying the overall system architecture
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 torque rod consistently demonstrates improved vibration control across various amplitude and frequency levels, enhancing riding comfort and noise vibration performance by effectively preventing vibration transmission, even under high-frequency and large load conditions.
Implementation Method 1
an actuator including: a shaft having two opposite ends mounted to the connecting rod and extending in an axial direction of the connecting rod; a mass member shaped in a tube to surround the shaft; a coil and a winding core fixed to the shaft in the tube-shaped mass member; a permanent magnet mounted to an inner peripheral surface of the tube-shaped mass member or the shaft
Implementation Method 2
two elastic bushes to be mounted respectively to a vibration-generating side and a vibration-receiving side
Implementation Method 3
an incompressible fluid is filled into the equilibrium chamber; an orifice passage communicatively connecting the equilibrium chamber to the fluid chamber is formed
Data Source
AI summary
A torque rod (1) has two elastic bushes (2, 3) to be mounted respectively to a vibration-generating side and a vibration-receiving side, and a connecting rod (4) connecting the two elastic bushes (2, 3). The actively controlled vibration cancellation means (5) is an actuator including: the shaft (5a) having two opposite ends mounted to the connecting rod (4) and extending in an axial direction of the connecting rod (4), the mass member (5b) shaped in a tube to surround the shaft (5a); a coil (5e) and a winding core (5f) fixed to the shaft (5a) in the tube-shaped mass member (5b); a permanent magnet (5d) mounted to an inner peripheral surface of the tube-shaped mass member (5b) or the shaft (5a), and a connecting member (5c) for connecting at least one end of the tube-shaped mass members (5b) to the shaft (5a).