Support Plate Impact Absorber for Engine Shutdown Noise
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Solution Overview
Problem
Existing vibration reduction devices, such as centrifugal pendulum absorbers, face issues with metallic collision noise when the engine is turned off, as metal components collide due to loss of centrifugal force, leading to adverse NVH evaluations and user complaints.
Innovation Solution
A vibration reduction device is designed with an impact absorbing member featuring an over-molding portion mounted on a steel plate, which improves the durability of the stopper and prevents metallic impact noise by absorbing collisions between metal components and masses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rubber stopper is used to prevent collision between metal components, then collision noise is reduced, but the stopper durability is insufficient and metallic impact noise still occurs
Solution Approach 1:
The invention uses a composite structure combining a metal ring portion with rubber over-molding portions. The metal ring provides structural strength and durability, while the rubber portions provide shock absorption and noise reduction. This composite material approach resolves the contradiction by integrating both strength and damping properties in a single component.
Solution Approach 2:
The over-molding portions protrude from the ring portion to create cushioning elements that contact the masses before complete collision can occur. This beforehand cushioning prevents direct metal-to-metal impact by absorbing energy through the rubber material, thereby reducing impact noise while maintaining durability.
2Strength
If metal components are used for the support plate and masses, then structural strength is improved, but collision noise occurs when centrifugal force is lost
Solution Approach 1:
The impact absorbing member acts as an intermediary element between the metal support plate and the moving masses. The rubber over-molding portions of this intermediary component absorb collision energy, preventing direct contact and noise generation between metal parts while maintaining the structural strength provided by the metal components.
Solution Approach 2:
The invention changes the physical state and material properties at the contact interface by introducing rubber material with viscoelastic properties. This parameter change allows the system to maintain metal structural strength while transforming the collision interaction from rigid metal-to-metal contact to damped contact with the rubber material, thereby reducing noise.
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 proposed solution effectively enhances NVH properties by absorbing metallic collision noise and improving the durability of the stopper, thereby reducing user complaints and improving vehicle performance.
Implementation Method 1
an impact absorbing member coupled to the support plate and configured to come into contact with one side mass or the other side mass
Implementation Method 2
a plurality of over-molding portions formed along an outer periphery of the ring portion and configured to come into contact with left and right lower end edge portions of one side mass or the other side mass
Data Source
AI summary
A vibration reduction device includes a support plate, one side mass positioned at an edge of one side surface of the support plate, the other side mass disposed to be opposite to one side mass and positioned at an edge of the other side surface of the support plate, and an impact absorbing member coupled to the support plate and configured to come into contact with one side mass or the other side mass.