Subframe Structure Vibration Control via Mount Support Rigidity
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Solution Overview
Problem
Conventional subframe structures face challenges in effectively reducing power train vibration while maintaining impact absorption and mount support functions, particularly when the length of the vibration transmitting path is extended and damping members are used, leading to reduced damping performance.
Innovation Solution
A subframe structure with a body part fixed to the vehicle body through a mount support part, where the mount support part and vehicle body structure are rigidly coupled without attenuating elements, and a reinforcement part is provided to increase support rigidity, allowing for effective vibration reduction by optimizing the vibration transmitting path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the length of the vibration transmitting path is extended and damping members are added, then the vibration of the power train is attenuated, but the damping performance of the mount is reduced
Solution Approach 1:
The invention extracts and removes the subframe from between the mount support part and the vehicle body, eliminating the unnecessary vibration transmission path through the subframe. This allows the mount to directly connect to the vehicle body, preserving its damping performance while still achieving vibration attenuation through the optimized transmission path via the body part.
Solution Approach 2:
Instead of extending the vibration transmitting path through the subframe as in conventional designs, the invention inverts the approach by creating a direct connection from the mount support part to the vehicle body through the body part. This shortens the transmission path and allows the mount to effectively demonstrate its damping characteristics.
2Weight of moving object
If the subframe structure is constructed without tower members to reduce weight and component number, then the vehicle weight and component number are reduced, but the load path for transmitting impact load to the frontside frame is not formed
Solution Approach 1:
The body part is designed to perform multiple functions: it serves as the main structural component of the subframe, provides the mounting location for the mount support part, and creates the load transmission path to the vehicle body. This multi-functionality eliminates the need for separate tower members while maintaining structural integrity and load-bearing capacity.
Solution Approach 2:
The invention merges the functions of the subframe body and the tower members into a single integrated body part structure. The body part directly connects the mount support part to the vehicle body, combining what were previously separate components (subframe + tower members) into one unified structure that achieves both weight reduction and load path formation.
3Strength
If the mount support part is rigidly coupled to the vehicle body without attenuating elements, then the support rigidity is increased, but the vibration transmission may increase
Solution Approach 1:
The body part acts as an intermediary structure between the mount support part and the vehicle body. While the coupling is rigid to ensure support rigidity, the body part itself serves as a structural mediator that manages vibration transmission, allowing the mount to effectively attenuate vibrations while maintaining necessary structural support.
Data Source
AI summary
A subframe structure includes a subframe disposed below a vehicle body structure of a vehicle, and an extension frame extending forward from the subframe and configured to absorb an impact load from forward of a vehicle body. The subframe has a body part extending in a vehicle front-and-rear direction and a mount support part supporting a power train through a mount. The body part is fixed to the vehicle body structure through the mount support part.