Torque Rod Vibration Isolation via Parameter Optimization
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Solution Overview
Problem
Existing torque rods for connecting engines to vehicle bodies face challenges in reducing noise due to rigid body resonance, requiring adjustments in vehicle models and increased costs with special-shaped inner members, while maintaining durability and reducing vibration transmission characteristics below 100 N/mm.
Innovation Solution
A torque rod design featuring a small ring torsion spring and large ring spring ratio optimized for flat transmission characteristics, using a round pipe inner member and resin outer members, with a V-shaped large ring elastic member for improved durability and cost-effectiveness, and a method to determine these parameters for specific rod lengths and spring values to achieve less than 100 N/mm transmission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a special-shaped inner member is used to adjust resonance peak, then noise reduction is achieved, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent changes the geometric parameters of the elastic member (length, width, thickness) to adjust the resonance peak position. By modifying these parameters, the transmission characteristics are optimized to reduce noise without requiring special-shaped inner members, thus maintaining ease of manufacture.
Solution Approach 2:
The patent introduces a movable inner member that can be positioned at different locations along the elastic member. This dynamic adjustment capability allows resonance peak adjustment without changing the basic structure, avoiding the need for expensive special-shaped components while maintaining noise reduction effectiveness.
2Object-affected harmful factors
If a special-shaped inner member is used to adjust resonance peak, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The patent achieves noise reduction by changing the parameters of existing components (elastic member dimensions, inner member position) rather than introducing complex special-shaped structures. This maintains device simplicity while effectively adjusting resonance characteristics.
Solution Approach 2:
The patent designs the inner member as a universal component that can be positioned at multiple locations to serve different resonance adjustment needs. This multi-functional design eliminates the need for multiple special-shaped components, reducing overall device complexity.
3Object-affected harmful factors
If transmission characteristics are reduced below 100 N/mm, then noise reduction is achieved, but durability may be compromised
Solution Approach 1:
The patent optimizes the parameters of the elastic member (material properties, dimensions) to achieve transmission characteristics below 100 N/mm while maintaining adequate durability. By carefully selecting and adjusting these parameters, both noise reduction and reliability requirements are satisfied simultaneously.
Solution Approach 2:
The patent employs a movable inner member that can dynamically adjust the system's vibration characteristics. This allows the transmission characteristics to be reduced for noise control while the system maintains its load-bearing capacity and durability through proper structural design.
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 design achieves durable torque rods with flat transmission characteristics below 100 N/mm, reducing noise and costs, and allows for versatility across different vehicle models without the need for frequent adjustments, using readily available materials and simplifying manufacturing.
Implementation Method 1
a small ring elastic member (23) providing a connection between the outer member (21) and the small ring inner member (22), and a large ring elastic member (33) providing a connection between the outer member (31) and the inner member (32)
Implementation Method 2
Although this torque rod 10, originally, is a vibration isolating device for preventing the vibrations of the engine 12 from being transmitted to the vehicle body 14
Implementation Method 3
it is known that the vehicle body 14 resonates due to the rigid body resonance of the torque rod 10
Data Source
AI summary
A torque rod includes a small ring section to be connected to an engine, a large ring section to be connected to a vehicle body, and a rod section providing a connection between the small ring section and the large ring section. The large ring section includes an outer member connected to the rod section, an inner member to be connected to the vehicle body, and a large ring elastic member providing a connection between the outer member and the inner member. Based on a transmission characteristic map, which is prepared by mapping transmission characteristics of the torque rod that are determined by a rod length, a small ring torsion spring, a large ring spring and a large ring spring ratio as parameters, such a combination of parameters that the transmission characteristics are less than 100 N/mm is selected.