X-Engine Cylinder Block Assembly for Compact Design
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Solution Overview
Problem
Conventional internal combustion piston engines face challenges in achieving optimal performance, efficiency, and reduced noise and vibration while maintaining a compact, lightweight design with conventional connecting rods, which often compromise on bearing area, structure, and balance, especially in configurations like the 'V'-engine.
Innovation Solution
The Double-Acting Scotch Yoke (DASY) X-Engine configuration uses a cylinder block assembly with a two-piece design featuring block halves and valley covers, allowing for a smaller, lighter engine with improved balance and reduced fluid motion within the crankcase, utilizing a unique scotch yoke mechanism to couple four pistons to each crankpin, enabling pure sinusoidal motion and better vibration balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional connecting rods are used in V-engine configuration with two con rods per crankpin, then bearing area and structure can be maintained, but the engine size and weight are larger than desired
Solution Approach 1:
The cylinder block is divided into two separate block halves, each containing two cylinder banks. This segmentation allows the engine to achieve a compact X-configuration with four pistons coupled to each crankpin while maintaining manageable assembly and bearing structure complexity.
Solution Approach 2:
The patent transitions from conventional V-engine configuration to an X-configuration where cylinder banks are arranged in two intersecting planes. This dimensional reorganization allows four pistons to be coupled to each crankpin while reducing overall engine size and weight compared to traditional configurations.
2Productivity
If more than two con rods are attached to each crankpin, then the number of cylinders per crankpin increases, but bearing area and structural strength are compromised
Solution Approach 1:
The crankshaft is coupled to four pistons through a segmented arrangement where two reciprocating assemblies are coupled to each of two crankpins. This segmentation allows high productivity (four cylinders per crankpin) while maintaining structural strength by distributing loads across multiple bearing interfaces.
Solution Approach 2:
The X-configuration with cylinder banks in two intersecting planes enables four pistons to be effectively coupled to each crankpin through the scotch yoke mechanism, achieving high productivity without compromising crankshaft structural strength.
3Object-affected harmful factors
If conventional V-engine configuration is used, then manufacturing processes are conventional, but fluid motion in crankcase causes larger vibration and noise
Solution Approach 1:
The X-configuration with cylinder banks offset at angles in two intersecting planes creates a more balanced fluid motion pattern in the crankcase compared to conventional V-engines. This asymmetric arrangement reduces the mass of fluid in motion and minimizes vibration and noise.
Solution Approach 2:
The patent converts the potential harm of crankcase fluid motion into a benefit by arranging cylinder banks in an X-configuration that minimizes fluid friction and vibration. The offset arrangement of cylinder banks actually reduces the harmful fluid motion effects rather than increasing them.
Data Source
AI summary
A cylinder block assembly for an X-engine includes a first block half having two cylinder banks and valley openings between the two cylinder banks; and a second block half fastened to the first block half, the second block half having two cylinder banks and valley openings between the two cylinder banks. The valley openings in the first and second block halves allow an X-engine crank train assembly to be assembled within the cylinder block assembly.