Eccentric Spigot Throttle Body for Compact Gear Integration
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Solution Overview
Problem
Conventional electronically controlled throttle devices for two-wheeled vehicles face challenges in downsizing the gear unit while maintaining secure attachment spaces for rubber joints, leading to increased size and weight, which is not compatible with high-speed rotation-type engine characteristics.
Innovation Solution
The design involves forming spigots with eccentric axis lines on either side of the gear unit, allowing the gear unit to be positioned between the throttle bodies without elongating the throttle bodies, and configuring the gear unit to protrude beyond the spigots, enabling a larger gear unit while reducing the throttle body lengths and securing attachment spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear unit is positioned between the throttle bodies, then the attachment spaces for rubber joints can be secured, but the throttle bodies must be elongated in the intake air flowing direction
Solution Approach 1:
The spigots are designed with asymmetric positioning relative to the intake passage axis lines. Specifically, the axis lines of the spigots are formed to have eccentricity in a direction away from each other, allowing the gear unit to be positioned between the spigots without requiring elongation of the throttle bodies in the intake air flowing direction.
2Reliability
If the throttle bodies are elongated to secure attachment spaces, then the gear unit can be properly positioned, but the device size and weight increase
Solution Approach 1:
The asymmetric positioning of spigots with eccentric axis lines allows compact arrangement of the gear unit between the throttle bodies, avoiding the need for elongated throttle bodies and thereby reducing the overall device weight while maintaining secure attachment spaces.
3Reliability
If the throttle bodies are elongated to secure attachment spaces, then the gear unit can be properly positioned, but the device complexity increases
Solution Approach 1:
The asymmetric spigot configuration with eccentric axis lines simplifies the overall device structure by enabling the gear unit to be positioned between the spigots without requiring additional elongation of throttle bodies, thereby reducing structural complexity while maintaining proper attachment spaces.
Data Source
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AI summary
Spigots (17) are respectively formed on the engine sides of intake passages (5#1 and 5#2) defined in a first throttle body (2) and intake passages (5#3 and 5#4) defined in a second throttle body (3), and the end parts of rubber joints (18) extending from individual cylinders of an engine are fitted to the corresponding spigots and are fastened and fixed thereto with hose bands (19). A gear unit (12) is disposed between both throttle bodies (2 and 3) and drives and rotates a throttle shaft (8) with a motor (13) via the gear unit to be capable of opening and closing throttle valves (10) of the cylinders. Axis lines C2 of the spigots of the intake passages (5#2 and 5#3) positioned on both sides of the gear unit (12) are formed to have eccentricity in a direction away from each other, so that a part of the gear unit is positioned between the spigots. Thereby, attachment spaces of the rubber joints are secured without elongating the throttle bodies (2 and 3).