Motorcycle Air-Intake Duct with Nested Pipe for Acceleration
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Solution Overview
Problem
In motorcycles, the limited space between the carburetor and air cleaner restricts the length of the air-intake duct, making it difficult to simultaneously achieve a sufficient pipe-shaped portion length to inhibit turbulent flow and a large chamber volume to reduce negative pressure, thereby affecting engine responsiveness during acceleration.
Innovation Solution
An air-intake duct design featuring a pipe-shaped portion coupled to a flow rate control device, with a chamber portion having a larger inner diameter and an extended pipe-shaped portion that protrudes into the chamber, allowing for a longer air-intake passage and increased chamber volume, reducing turbulent flow and negative pressure, and improving responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the pipe-shaped portion is increased to inhibit turbulent flow, then smooth air supply is improved, but the volume of the chamber portion becomes small, worsening acceleration responsiveness
Solution Approach 1:
The extended pipe-shaped portion is nested within the chamber portion, allowing the pipe-shaped portion to effectively extend its length without increasing the overall external dimensions of the air-intake duct. This nesting arrangement enables the pipe-shaped portion to achieve sufficient length for smooth air supply while the chamber portion maintains its large volume for reducing negative pressure during acceleration.
Solution Approach 2:
Instead of extending the pipe-shaped portion in a straight line, the invention uses an extended portion that protrudes radially into the chamber portion's inner space. This dimensional change allows the air-intake passage to gain length in a radial direction rather than axial direction, resolving the conflict between passage length and chamber volume.
2Volume of stationary object
If the volume of the chamber portion is increased to reduce negative pressure during acceleration, then acceleration responsiveness is improved, but the length of the pipe-shaped portion becomes small, worsening smooth air supply
Solution Approach 1:
The extended pipe-shaped portion is nested within the chamber portion, allowing the pipe-shaped portion to effectively extend its length without increasing the overall external dimensions of the air-intake duct. This nesting arrangement enables the pipe-shaped portion to achieve sufficient length for smooth air supply while the chamber portion maintains its large volume for reducing negative pressure during acceleration.
Solution Approach 2:
Instead of extending the pipe-shaped portion in a straight line, the invention uses an extended portion that protrudes radially into the chamber portion's inner space. This dimensional change allows the air-intake passage to gain length in a radial direction rather than axial direction, resolving the conflict between passage length and chamber volume.
3Length of moving object
If the overall length of the air-intake duct is increased to accommodate both sufficient pipe-shaped portion and large chamber portion, then both functions are improved, but the duct cannot fit in the limited space between carburetor and air cleaner
Solution Approach 1:
The extended pipe-shaped portion is nested within the chamber portion, allowing the pipe-shaped portion to effectively extend its length without increasing the overall external dimensions of the air-intake duct. This nesting arrangement enables the pipe-shaped portion to achieve sufficient length for smooth air supply while the chamber portion maintains its large volume for reducing negative pressure during acceleration.
Solution Approach 2:
Instead of extending the pipe-shaped portion in a straight line, the invention uses an extended portion that protrudes radially into the chamber portion's inner space. This dimensional change allows the air-intake passage to gain length in a radial direction rather than axial direction, resolving the conflict between passage length and chamber volume.
Data Source
AI summary
An air-intake duct through which air taken in from outside is guided to an air flow rate control device configured to control an amount of air flow that is supplied to an engine of a vehicle, including a pipe-shaped portion that is coupled to the flow rate control device and has an air-intake passage formed therein, a chamber portion that is located upstream of the air-intake passage of the pipe-shaped portion in the air flow and has an inner diameter larger than an inner diameter of the pipe-shaped portion, and an extended pipe-shaped portion configured to extend continuously from the pipe-shaped portion so as to protrude into an inner space of the chamber portion, the extended pipe-shaped portion forming an extended passage connected to the air-intake passage of the pipe-shaped portion.