Inline Six-Cylinder Dynamic Damper Layout for Crankshaft Vibration
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Solution Overview
Problem
Existing damping structures for inline six-cylinder engines fail to effectively suppress vibration and radiation sound propagation into the vehicle cabin, particularly at resonance frequencies, due to inadequate attachment locations of inertial masses and limited directional vibration absorption.
Innovation Solution
A damping structure for inline six-cylinder engines featuring a dynamic damper attached to the lower part of the cylinder block between specific cylinders, comprising a stationary part, a beam part, and two mass parts, designed to absorb vibrational energy in both vertical and lateral directions, with a symmetrical H-shape and made of cast iron for enhanced effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the flywheel is fixed to the rear end of the crankshaft, then the crankshaft vibrates with larger amplitude at the front end side, but existing dampers cannot effectively absorb vibration in this region
Solution Approach 1:
The patent addresses the uneven vibration distribution caused by the flywheel by positioning the dynamic damper at a specific location between the second and fourth cylinders on the front end side of the crankshaft. This localized placement targets the region with larger vibration amplitude, optimizing the damper's effectiveness in absorbing vibrations where they are most intense, rather than using a generic or rear-end location.
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 damping structure effectively reduces resonance peaks and vibrational energy across multiple directions, achieving significant sound attenuation and space efficiency by leveraging the unique design and material properties of the dynamic damper.
Implementation Method 1
a dynamic damper attached to a lower part of the cylinder block, at at least one location between two adjacent cylinders among second through fourth cylinders... by attaching the dynamic damper to the lower part of the cylinder block at at least one location between the two adjacent cylinders among the second through fourth cylinders in the longitudinal direction, vibrational energy can be absorbed effectively in the part where the amplitude is large
Data Source
AI summary
A damping structure of an inline six-cylinder engine is provided, which includes pistons reciprocatably fitted in the six cylinders, respectively, a crankshaft disposed below the pistons in a vertical direction of a vehicle and coupled to the pistons via connecting rods, respectively, the crankshaft being rotatable about an axis, a cylinder block having a plurality of crank journal parts disposed below the crankshaft in the vertical direction to rotatably support the crankshaft between adjacent cylinders in the crankshaft, a flywheel fixed to a rear end of the crankshaft in the longitudinal direction of the vehicle, and a dynamic damper attached to a lower part of the cylinder block, at at least one location between two adjacent cylinders among second through fourth cylinders, the six cylinders being disposed in an order of first through sixth cylinders from a front side to a rear side in the longitudinal direction.