V-Type Engine Eccentric Cylinder Banks for Compact Auxiliary Housing
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Solution Overview
Problem
V-type engines face challenges in maintaining a compact design with a small overall height while effectively housing engine auxiliary machines and minimizing intake interference between banks.
Innovation Solution
The engine design features first and second banks arranged in a V-shape with a shared crankshaft, a large valley portion for auxiliary machine housing, and a twin carburetor with orthogonal intake paths connected via conduit paths forming an intake manifold, which avoids intake interference and simplifies the intake system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the valley portion is made large to house auxiliary machines, then the auxiliary machine housing function is improved, but the opening angle between banks must be reduced
Solution Approach 1:
The patent applies asymmetry by positioning the cylinder center lines to pass through a point eccentric from the crankshaft rotational center. This asymmetric arrangement creates an enlarged valley portion on one side while maintaining the required opening angle between banks, allowing auxiliary machines to be housed without compromising the bank angle configuration.
2Length of stationary object
If the overall height is reduced to make the engine compact, then the engine size is improved, but the auxiliary machine housing space is reduced
Solution Approach 1:
The patent resolves this contradiction by utilizing the valley portion between banks as an additional spatial dimension for housing auxiliary machines. Instead of increasing overall height, the design exploits the lateral space created by the eccentric cylinder center line arrangement, allowing auxiliary machines to be accommodated within the existing envelope dimensions.
3Productivity
If the intake paths are arranged to avoid interference, then the intake performance is improved, but the intake system complexity increases
Solution Approach 1:
The patent applies segmentation by providing separate first and second conduit paths that individually connect the twin carburetor to the intake ports of the first and second banks respectively. This segmented arrangement prevents intake interference between banks while maintaining a relatively simple structure, as each conduit path is independent and can be routed separately without complex interactions.
Data Source
AI summary
A V-type engine includes: first and second banks which are arranged in a V-shape and which respectively have cylinder bores; a crankshaft which is shared by the first and second banks; a crankcase which supports the crankshaft, the first and second banks being connected to the crankcase; and a valley portion which is defined between the first and second banks, an engine auxiliary machine being disposed in the valley portion. The first and second banks are arranged so that a cylinder center line of the first bank and a cylinder center line of the second bank respectively pass through a point which is eccentric from a rotational center of the crankshaft to a side opposite from both the banks. Thus, it is possible to improve an auxiliary machine housing function of the valley portion defined between the first and second banks while maintaining a predetermined opening angle therebetween.