Water-Cooled V-Type Engine Coolant Routing
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Solution Overview
Problem
Conventional water-cooled V-type engines have long coolant hoses due to the distant location of the water pump from cylinder blocks and heads, increasing manufacturing costs and desiring further hose shortening.
Innovation Solution
A water-cooled V-type engine design with the water pump positioned near the first cylinder, featuring separate coolant passages to the cylinder heads and a radiator, along with strategically placed discharge openings and a restricted branching portion to control coolant flow, reducing hose length and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the water pump is located distantly from cylinder blocks and cylinder heads, then the water pump can be positioned for optimal cooling coverage, but the coolant hose becomes very long, causing increase in manufacturing cost
Solution Approach 1:
The coolant distribution system is segmented into multiple separate coolant passages: a first coolant passage from the water pump to the first cylinder head, and a second coolant passage from the first coolant passage to the second cylinder head. This segmentation allows the water pump to be positioned optimally while distributing coolant efficiently to multiple locations without requiring excessively long single hoses.
Solution Approach 2:
The first coolant passage acts as an intermediary conduit that carries coolant from the water pump to the first cylinder head and also serves as the source for the second coolant passage to the second cylinder head. This intermediary structure enables efficient coolant distribution to multiple locations from a centrally positioned water pump.
2Device complexity
If the water pump is provided at the upper portion of crankcase, then the structure is simplified, but the coolant hose cannot be sufficiently shortened
Solution Approach 1:
The coolant distribution is divided into separate passages: a first coolant passage from the water pump to the first cylinder head, and a second coolant passage branching from the first to the second cylinder head. This segmentation enables the water pump to be positioned at the upper portion of the crankcase while maintaining short coolant hose lengths through efficient routing.
Solution Approach 2:
The coolant passages utilize three-dimensional spatial routing, with the second coolant passage branching off the first coolant passage at an optimized angle and position. This dimensional optimization allows short hose lengths while maintaining the water pump's optimal position at the upper crankcase portion.
3Productivity
If separate coolant passages are provided to each cylinder head, then coolant delivery efficiency is improved, but the number of parts increases
Solution Approach 1:
The first coolant passage serves dual purposes: it delivers coolant directly to the first cylinder head and also acts as the source conduit for the second coolant passage that delivers coolant to the second cylinder head. This merging of functions reduces the total number of separate components while maintaining efficient coolant delivery to both cylinder heads.
Solution Approach 2:
The first coolant passage is designed with multi-functionality, serving both as the primary coolant delivery route to the first cylinder head and as the supply line for the second coolant passage to the second cylinder head. This universal component performs multiple functions, reducing overall system complexity.
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
The design shortens coolant hoses, efficiently cools the engine by prioritizing coolant delivery to higher-temperature cylinder heads, minimizes vertical coolant displacement, and reduces the number of parts and manufacturing costs.
Implementation Method 1
a water pump for feeding a coolant from a radiator to the water jackets of the first and second cylinders
Implementation Method 2
a first coolant passage for supplying the coolant discharged from the water pump to the water jacket of the cylinder head of the first cylinder
Implementation Method 3
the coolant that has first cooled the cylinder head of the first cylinder and has next cooled the cylinder block of the first cylinder
Implementation Method 4
a coolant return passage for supplying the coolant discharged from the first discharge opening and the second discharge opening to the radiator
Data Source
AI summary
A water-cooled V-type engine includes a first coolant passage for supplying a liquid coolant discharged from a water pump disposed proximate a first cylinder, to a water jacket of the first cylinder. The engine also includes a second coolant passage which is branched off from the first coolant passage, and which is provided for supplying coolant to a water jacket of a second cylinder. The engine design allows for a shortened coolant hose. The water pump may include an integral fluid conduit including a branching portion where said second coolant supply passage is branched from said first coolant supply passage, and a restricted portion proximate the branching portion. A motorcycle including a vehicle body frame is also described, where the water-cooled V-type engine is operatively attached to the vehicle body frame.