Crankcase-Integrated Scavenge Pump for Rough Terrain Engines
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Solution Overview
Problem
Existing engine lubrication systems, particularly those used in vehicles for rough terrain, face challenges in protecting pumps from flying objects like stones and maintaining oil collection efficiency, especially when pumps are arranged outside the engine.
Innovation Solution
The engine lubrication system incorporates a scavenge pump accommodated within the crankcase, which reduces the length of oil passages and suction resistance, enhancing oil collection efficiency while protecting the pump from external hazards by integrating the pump unit into the engine's crankcase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the scavenge pump is arranged outside the engine, then the pump can be easily accessed for maintenance, but the pump becomes vulnerable to flying objects and the oil passage length increases
Solution Approach 1:
The scavenge pump is nested within the crankcase, utilizing the existing engine structure to house the pump. This integration protects the pump from external hazards while maintaining a compact design. The pump is positioned in a dedicated space within the crankcase, allowing it to be shielded from flying objects without requiring separate external housing.
Solution Approach 2:
The pump housing is merged with the crankcase structure, combining two separate components into a unified assembly. This integration eliminates the need for separate external pump housing and provides inherent protection for the pump. The oil passage is also integrated directly into the crankcase, reducing its length and improving efficiency.
2Ease of repair
If the scavenge pump is arranged outside the engine, then the pump can be easily replaced, but the oil passage length increases and suction resistance increases
Solution Approach 1:
The scavenge pump is nested within the crankcase, utilizing the existing engine structure to house the pump. This integration protects the pump from external hazards while maintaining a compact design. The pump is positioned in a dedicated space within the crankcase, allowing it to be shielded from flying objects without requiring separate external housing.
3Reliability
If the oil passage is made longer to accommodate external pump, then the pump can be positioned externally for protection, but the suction resistance increases
Solution Approach 1:
The pump housing is merged with the crankcase structure, combining two separate components into a unified assembly. This integration eliminates the need for separate external pump housing and provides inherent protection for the pump. The oil passage is also integrated directly into the crankcase, reducing its length and improving efficiency.
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 increases oil collection efficiency, reduces suction resistance, and protects the pump from external damage, allowing for a more compact and efficient engine design suitable for vehicles that operate in rough conditions.
Implementation Method 1
a scavenge pump accommodated in the crankcase and sucking the oil from the oil passage
Data Source
AI summary
An engine lubrication system including an oil passage allowing inflow of oil in a crank chamber partitioned off in a crankcase of an engine, at least a part of the oil passage being formed by the crankcase, a scavenge pump accommodated in the crankcase and sucking the oil from the oil passage, an oil tank accumulating the oil sucked by the scavenge pump, and a feed pump supplying, to the engine, the oil accumulated in the oil tank.