Motorcycle Engine Oil Passage Structure for Downsizing and Protection
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Solution Overview
Problem
Existing engine oil passage structures in small vehicles face challenges in downsizing and protecting the oil passage from external forces, as they often bulge and lack adequate protection against external impacts.
Innovation Solution
The engine oil passage structure features a right-left direction oil passage that extends along a valley part formed by the crankcase and cylinder block, providing a compact design and protection by concealing the passage within the valley, while also incorporating return and front-rear direction oil passages to maintain engine size and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the oil passage extends in the top-bottom direction at the front wall of the crankcase and cylinder block, then the oil passage is easily accessible, but the engine size increases due to bulging and the oil passage is exposed to external forces
Solution Approach 1:
The oil passage is reconfigured to extend in the right-left direction along the valley part formed by the obtuse angle between the crankcase front wall and cylinder block front wall, changing from a top-bottom orientation to a horizontal orientation that utilizes the angular space between components, thereby avoiding vertical bulging and reducing engine size
2Ease of operation
If the oil passage extends in the top-bottom direction at the front wall, then the oil passage is easily accessible, but the oil passage is exposed to external forces such as stones thrown by other vehicles
Solution Approach 1:
The oil passage is nested within the valley part formed by the angular arrangement of the crankcase and cylinder block front walls, utilizing the existing structural space to conceal the passage while maintaining its functional accessibility, thereby protecting it from external forces
3Volume of moving object
If the oil passage is concealed in the valley part extending in the right-left direction, then the engine size is reduced and the oil passage is protected, but the oil passage accessibility is reduced
Solution Approach 1:
The oil passage is strategically positioned along the valley part where it can be concealed for protection and compactness, while its routing and connection points are designed to maintain adequate accessibility for oil supply functions, balancing protection with operational requirements
Data Source
AI summary
An engine oil passage structure for an engine contributing to downsizing the engine and achieving protection of an oil passage against external forces is provided. Provided is an oil passage structure for an engine installed in a small vehicle, the engine including an engine body formed of a crankcase and a cylinder block and a cylinder head stacked inclined vehicle frontward on the crankcase, the crankcase, the cylinder block, and the cylinder head being integrally fastened. The oil passage structure includes, near a bent part formed by a case front wall of the crankcase and a cylinder front wall of the cylinder block forming a valley part by an obtuse angle, a right-left direction oil passage extending in a right-left direction along the valley part.