Crankcase Ceiling Balancer Mechanism for Engine Vibration and Space
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Solution Overview
Problem
Conventional internal combustion engine designs with balancer mechanisms reduce spatial margins behind the cylinder and above the crankcase, hindering fuel tank capacity expansion and equipment installation, particularly in vehicles like motorcycles.
Innovation Solution
A balancer mechanism is integrated into the crankcase of the internal combustion engine, with an idler gear and balancer disposed along the ceiling wall, reducing vibration and optimizing space usage by positioning them behind the crankshaft, allowing for increased fuel tank capacity and equipment arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the balancer mechanism is arranged along the cylinder and in the direction of the cylinder bore center line, then the vibration reduction function is achieved, but the spatial margin behind the cylinder and above the crankcase is reduced
Solution Approach 1:
The balancer mechanism is repositioned from a conventional arrangement along the cylinder bore center line to a new arrangement along the ceiling wall of the crankcase. This dimensional repositioning moves the idler gear and balancer to the rear of the crankshaft, utilizing previously underutilized space in the crankcase, thereby reducing engine vibration while preserving spatial margins for fuel tank expansion and equipment installation.
2Object-affected harmful factors
If the idler gear and balancer are arranged in the conventional position, then the vibration reduction function is achieved, but the fuel tank capacity is limited
Solution Approach 1:
By relocating the balancer mechanism to the ceiling wall area of the crankcase rather than the conventional cylinder-aligned position, the design frees up space behind the cylinder that can be utilized for expanding the fuel tank capacity while maintaining the vibration reduction function.
3Object-affected harmful factors
If the idler gear and balancer are arranged in the conventional position, then the vibration reduction function is achieved, but the installation space for equipment is limited
Solution Approach 1:
The balancer mechanism is repositioned to the ceiling wall of the crankcase behind the crankshaft, creating additional installation space behind the cylinder and above the crankcase for equipment such as the anti-lock brake system while maintaining the vibration reduction function.
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 effectively reduces engine vibration while providing additional space for fuel tank expansion and equipment installation, improving the layout and performance of vehicles by maintaining a compact design.
Implementation Method 1
an idler gear disposed behind the crankshaft and rotated by power transmitted from the crankshaft
Implementation Method 2
a balancer disposed behind the idler gear and rotated by power transmitted from the idler gear... configured to reduce vibration of the internal combustion engine
Data Source
AI summary
To provide a vehicle that includes a balancer mechanism for reducing vibration of the engine and can leave a space margin for increasing the fuel tank in size and/or arranging equipment or components at the rear of the cylinder and above the crankcase. A vehicle includes: an engine mounted on a body frame. The engine comprises a crankcase with a ceiling wall, a crankshaft provided in the crankcase, and a balancer mechanism for reducing vibration of the engine by power transmitted from the crankshaft. The balancer mechanism comprises an idler gear disposed behind the crankshaft and rotated by power transmitted from the crankshaft, and a first balancer disposed behind the idler gear and rotated by power transmitted from the idler gear. The idler gear and the first balancer are disposed along the ceiling wall.