Motorcycle Cooling System Layout for Compact Width and Aesthetics
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Solution Overview
Problem
Existing cooling system structures for small-sized vehicles, such as motorcycles, face challenges in minimizing the size of the power unit in the vehicle width direction and reducing piping length, while maintaining an aesthetically pleasing appearance, due to the positioning of the water pump and thermostat.
Innovation Solution
The water pump is positioned rearwardly to sandwich the cylinder section between itself and the radiator, with a discharge port connected to one water jacket and a suction port connected to another, allowing for shorter piping lengths and improved routing of pipes, and the thermostat is mounted on the front wall surface to select communication conditions between water jackets directly or via the radiator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the water pump is disposed on the side wall of the cylinder body, then the positioning is less likely to be subject to restrictions in terms of layout, but the power unit size increases in the vehicle width direction and the piping length becomes longer
Solution Approach 1:
The water pump is repositioned from a lateral arrangement (vehicle width direction) to a longitudinal arrangement along the vehicle length direction. Specifically, the water pump is disposed at the rear of the cylinder body in the longitudinal direction, changing the spatial dimension of installation from width to length, thereby reducing the power unit width while maintaining layout flexibility through the longitudinal piping route
2Reliability
If external pipes are disposed on both sides of the engine main unit to connect the thermostat and radiator, then the cooling system functions, but the appearance is degraded
Solution Approach 1:
The piping routes are merged and consolidated to pass through the central longitudinal space of the engine main unit rather than extending externally on both sides. The discharge port connects to one water jacket and the suction port to another through centrally routed pipes, eliminating the need for external side pipes and improving appearance while maintaining cooling functionality
3Length of stationary object
If the water pump is disposed forwardly of the cylinder body, then the piping length to the radiator is reduced, but the power unit size increases in the vehicle width direction
Solution Approach 1:
Instead of reducing piping length by moving the water pump forward in the width direction, the solution moves the water pump rearward in the longitudinal direction. This dimensional shift allows the pipes to route centrally along the length of the engine, achieving compact width dimensions while maintaining reasonable piping lengths through the longitudinal axis
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 reduces the size of the power unit in the vehicle width direction, shortens piping lengths, and improves the appearance by allowing pipes to be routed more centrally, enhancing the overall cooling system efficiency and aesthetics.
Implementation Method 1
a water pump disposed on an engine main unit to perform a forced circulation of coolant through a radiator and water jackets
Implementation Method 2
A radiator is disposed forwardly of the engine main unit with a water pump disposed on the engine main unit. The water pump performs a forced circulation of coolant through the radiator and the water jackets.
Data Source
Figure 1
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Figure 3
AI summary
In a cooling system structure for a vehicular water-cooled internal combustion engine (E) with a cylinder section and a cylinder body (41) and a cylinder head (42). The cooling system structure having water jackets (50A) formed in the cylinder body (41) and the cylinder head (42), respectively, with a radiator (52) disposed forwardly of the engine main unit. A water pump performs forced circulation of coolant through the radiator (52) and the water jackets (50A), to permit routing of pipes with enhanced appearance. Water jackets (50A) are formed, respectively, in a cylinder body (41) and a cylinder head (42) such that coolant flows through the cylinder body (42) and the cylinder head (42) independently of each other. A thermostat is mounted on a front wall surface of a cylinder section and is capable of selecting a condition in which the water jackets (50A) directly communicate with each other or a condition in which the water jackets (50A) communicate with each other via a radiator (52).