Offset Engine Bracket Insertion Hole for Vibration Isolation
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Solution Overview
Problem
Existing engine mount structures fail to achieve a high natural frequency and weight reduction for engine brackets, which are essential for minimizing vibration and sound generation, as they often require complex designs and fastening members that complicate assembly and increase weight.
Innovation Solution
The engine mount structure features an offset engine bracket insertion hole in the inner tube, allowing for a shorter engine bracket length, made from lightweight aluminum alloys, and uses a rubber cushioning member to ensure precise fitting without fastening members, thereby increasing natural frequency and reducing weight while preventing resonance and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine bracket is designed with a longer length to ensure structural stability, then the natural frequency departs more from the engine frequency, but the weight increases
Solution Approach 1:
The insertion hole is positioned asymmetrically (offset from the center) rather than symmetrically at the center. This asymmetric positioning allows the bracket to achieve the required natural frequency characteristics with a shorter overall length, thereby reducing weight while maintaining vibration isolation performance
Solution Approach 2:
The patent changes the positional parameter of the insertion hole (offset distance from center) to optimize the bracket's natural frequency. By adjusting this parameter, the bracket achieves desired vibration characteristics with reduced length and weight
2Weight of moving object
If the engine bracket length is reduced to decrease weight, then the natural frequency increases, but the structural stability may be compromised
Solution Approach 1:
The asymmetric insertion hole positioning creates an optimized stress distribution pattern that maintains structural stability even with reduced bracket length. The offset position acts as a strategic reinforcement point that compensates for the shorter overall dimensions
Solution Approach 2:
The insertion hole is pre-positioned at the optimal offset location during design to preemptively ensure both stability and high natural frequency. This preliminary optimization of the geometric parameter allows the shortened bracket to achieve both weight reduction and structural integrity
3Reliability
If fastening members such as bolts and nuts are used to secure the engine bracket, then the connection reliability improves, but the number of components and weight increase
Solution Approach 1:
The insertion hole design merges the connection function directly into the bracket structure itself, eliminating the need for separate fastening members. The offset insertion hole creates a self-locking or interference fit mechanism that provides reliable connection without additional components
Solution Approach 2:
The patent extracts and removes the fastening members (bolts, nuts) from the system by redesigning the connection interface. The offset insertion hole provides an alternative connection mechanism that achieves the same reliability without these additional components
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 design effectively raises the natural frequency of the engine bracket, reduces weight, and simplifies assembly by eliminating fastening members, thereby suppressing vibrations and sounds while maintaining structural integrity and ease of assembly.
Implementation Method 1
a rubber elastic body (8) interposed between the inner tube fitting (6) and the outer tube fitting (7)
Data Source
AI summary
An engine mount structure includes: an engine bracket 1 mounted to an engine; and an anti-vibration device 2 having an outer tube 7 fixed to a vehicle body, an inner tube 6 to which a front end portion of the engine bracket is inserted and fitted, and a rubber elastic body 8 interposed between the outer tube and the inner tube, wherein an engine bracket insertion hole 9 provided to the inner tube is offset from the center L of a mounting portion of the inner tube mounted to the rubber elastic body, toward the engine bracket. Accordingly, the bracket extending from the engine is allowed to have a natural frequency departing as much as possible from a natural frequency of the engine, and simultaneously, a reduction in weight can be achieved.