Vertical Engine Breather Chamber Gas-Liquid Separation
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Solution Overview
Problem
Vertical type engines face challenges in effective gas-liquid separation in the timing transmission chamber, leading to the discharge of oil droplets with blow-by gas due to the dispersion of lubricant oil, which complicates the breather system and increases engine size.
Innovation Solution
A dedicated breather chamber is introduced between the generator and the crank chamber, with a bulkhead forming a partition between the timing transmission and breather chambers, and a two-step breather system comprising upper and lower breather chambers with labyrinth walls for efficient oil separation, preventing oil droplets from entering the breather inlet pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a breather pipe is directly connected to the timing transmission chamber, then the structure is simple, but a considerable amount of oil droplets are discharged to the breather pipe together with blow-by gas
Solution Approach 1:
The breather system is segmented into two distinct chambers: the timing transmission chamber and the breather chamber. The bulkhead divides these chambers, allowing the breather chamber to serve as a dedicated gas-liquid separation zone. This segmentation enables effective separation of oil droplets from blow-by gas before exhaust, resolving the contradiction between structural simplicity and oil discharge prevention.
Solution Approach 2:
The breather chamber acts as an intermediary between the timing transmission chamber and the external environment. It receives blow-by gas containing oil droplets, facilitates gas-liquid separation through its dedicated structure, and then exhausts the cleaned gas. This intermediary function prevents direct discharge of oil droplets while maintaining reasonable system complexity.
2Object-generated harmful factors
If a dedicated breather chamber is provided for gas-liquid separation, then oil separation efficiency is improved, but the entire size of the engine increases
Solution Approach 1:
The breather chamber is merged with the existing engine structure by utilizing the space between the engine body and the cover member. The bulkhead is integrally formed with one or both of these components, combining the breather chamber function with the existing structural elements. This merging approach achieves effective gas-liquid separation without significantly increasing the overall engine size.
Solution Approach 2:
The breather chamber is positioned in the vertical dimension between the engine body and the cover member, utilizing previously unused space. This dimensional placement allows the breather chamber to be integrated into the existing engine envelope without requiring additional lateral or longitudinal space, thus avoiding engine size increase while maintaining separation efficiency.
3Ease of manufacture
If the timing transmission chamber and breather chamber are defined between engine body and cover member, then assembling is simplified, but the structural integration becomes more complex
Solution Approach 1:
The bulkhead is integrally formed with one or both of the engine body and the cover member, merging multiple structural elements into unified components. This integral formation simplifies the assembly process by reducing the number of separate parts that need to be fitted together, while the design of the integral structure accounts for the complexity of structural integration during the manufacturing design phase.
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 efficiently separates oil from breathing gas, prevents unnecessary oil discharge, and maintains a compact engine design by integrating the breather system within the existing engine structure, simplifying assembly and reducing engine size.
Implementation Method 1
a breather chamber communicating with the crank chamber and an outside is provided between the generator and the crank chamber placed below the generator on the side opposite from the cam shaft with respect to the crankshaft
Data Source
AI summary
A vertical type engine includes: an engine body having a crank chamber and a cylinder bore; and a timing transmission chamber provided above the engine body and housing a timing transmission device that connects between a crankshaft and a cam shaft which are vertically placed, respectively, wherein a generator driven by the crankshaft is placed above the timing transmission device, and a breather chamber communicating with the crank chamber and an intake silencer box is provided between the generator and the crank chamber placed below the generator on the side opposite from the cam shaft with respect to the crankshaft. Hence, a vertical type engine that includes a breather chamber dedicated for gas-liquid separation and is compact can be achieved.