V-Type Engine Blow-By Separator Layout Optimization
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Solution Overview
Problem
In V-type internal combustion engines, the limited space between banks poses challenges in arranging oil separators effectively, compromising blow-by processing performance and mountability due to the need for efficient oil mist separation and discharge.
Innovation Solution
Optimizing the layout of three separators by placing a large-capacity first separator in the bank where the crankshaft rotates upward and smaller second and third separators in juxtaposition in the bank where it rotates downward, eliminating the need for a third separator in the limited inter-bank space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separators are provided in all three gas routes, then oil mist separation performance is improved, but the device complexity and space requirements increase
Solution Approach 1:
The patent extracts the separator from one of the gas routes (specifically the third gas route connected to throttle downstream part) and eliminates it, relying on the separators in the first two gas routes to handle the blow-by gases. This reduces the total number of separators from three to two, simplifying the device while maintaining adequate separation performance.
Solution Approach 2:
The patent combines the function of oil mist separation for all three gas routes into just two separators - one separator handles the combined blow-by gases from the first and second gas routes, while the third gas route does not require a separate separator. This merging of functions reduces component count and simplifies the overall system.
2Reliability
If three separators are arranged in the limited space between banks, then oil separability is maintained, but the ease of manufacture and assembly deteriorates
Solution Approach 1:
The patent removes the requirement for a separator in the third gas route, extracting this component from the system. This eliminates the need to fit three separators into the constrained inter-bank space, significantly improving ease of manufacture and assembly while maintaining adequate oil separation capability through the remaining two separators.
3Reliability
If a large-capacity separator is installed in the first bank, then oil discharge performance is improved, but the volume of the device increases
Solution Approach 1:
The patent applies local quality by providing a large-capacity separator specifically in the first bank where blow-by gases with higher oil content are present, while using a smaller or no separator in the third gas route where oil content is lower. This targeted approach ensures adequate oil discharge performance where needed without unnecessarily increasing overall device volume.
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
This configuration ensures desired blow-by processing performance and improved mountability by securing sufficient separator capacity and space efficiency, maintaining oil separability and discharge performance without sacrificing performance.
Implementation Method 1
a first separator, a second separator, and a third separator, each of which has a function that separates oil mist from blow-by gas
Implementation Method 2
By the way, in the first bank arranged on a side where a crankshaft rotates upward from a bottom, rotary motion of the crankshaft causes an upward airflow directed from the crankcase toward the first separator
Data Source
Figure 1
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AI summary
It is an object of the invention to improve space efficiency, while ensuring a desired blow-by gas processing performance. As gas routes that connect a crankcase (18) and each of intake passages, a first gas route (31) and a second gas route (32) connected to respective throttle upstream parts of the intake passages on the upstream side of each throttle valve (27) for each bank (VA, VB), and a third gas route (33) connected to a throttle downstream part of the intake passage for one of the banks are provided. Separators (34-36), each of which has a function that separates oil mist from blow-by gas, are disposed in the respective gas routes (31-33). Only the first separator (34) is disposed in the first bank (VA) on the side where a crankshaft rotates upward from the bottom. The second separator (35) and the third separator (36) are both disposed in the second bank (VB) arranged on the side where the crankshaft rotates downward from the top and placed in juxtaposition with each other.