Crankshaft Pendulum One-Piece Bumper NVH
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Solution Overview
Problem
Existing pendulum arrangements for internal combustion engines face issues with metal-to-metal impact and NVH due to loose bumpers, which can lead to increased vibration and risk of clogged oil lines, compromising the effectiveness of vibration absorption and potentially causing early engine failure.
Innovation Solution
A one-piece, full-length, wrap-around bumper made of durable and oil-resistant material, such as rubber, is securely captured between two pendulum halves using continuous mirror-image channels, ensuring it remains attached and prevents metal-to-metal contact by providing a consistent impact-dampening solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rubber bumpers are used to dampen metal-on-metal contact, then NVH is reduced, but the bumpers can move out of their assembled positions and become loose
Solution Approach 1:
The bumper is divided into multiple segments or pieces that can independently dampen vibrations while being retained in position by the pendulum structure. This segmentation allows the bumper to effectively reduce NVH through distributed contact points while maintaining positional stability through the retaining features of the pendulum halves.
2Object-affected harmful factors
If the pendulum uses a one-piece full-length wrap-around bumper, then NVH is reduced and bumper position is maintained, but the device complexity increases
Solution Approach 1:
The bumper is designed as a single continuous one-piece component that wraps around the pendulum, merging multiple damping functions into one integrated structure. This approach reduces NVH effectively across the entire pendulum surface while actually simplifying the overall assembly process and improving reliability by eliminating gaps or joints between separate bumper pieces.
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 solution effectively reduces NVH by maintaining the bumper's position and preventing it from becoming loose, thereby enhancing the vibration absorption performance and reducing the risk of engine damage, while ensuring consistent dampening across various engine operations.
Implementation Method 1
rubber bumpers are located on the pendulum or on the pendulum carrier to dampen the metal-on-metal contact
Implementation Method 2
A one-piece, full-length, wrap-around bumper made of durable and oil-resistant material, such as rubber
Implementation Method 3
When the engine is running and the crankshaft is rotating, centrifugal force keeps the pendulum in its full out position
Data Source
AI summary
A full, one-piece, wrap around bumper for a crankshaft pendulum is disclosed. The pendulum includes two halves. Continuous, mirror-image bumper-receiving channels are formed in each pendulum half. When the two halves are attached, the bumper is captured between therebetween and is retained by a crush fit. Each pendulum half includes an elevated central area and a pair of recessed areas with each recessed area formed on one side of the elevated area. Side walls are formed at the intersections of the elevated area and the recessed areas. A base wall is formed along the lower edge of the elevated area. The continuous channel in each half is formed along portions of the side walls and along the entire length of the base wall. The elongated, one-piece bumper wraps around the side walls and the base wall and extends from the elevated area beyond the side and base walls.