Motorcycle Exhaust Pipe Wrapping Engine for Silencing

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Solution Overview

Problem

Existing exhaust pipe designs for vehicles, particularly motorcycles, often lack sufficient length and optimal configuration, leading to inefficiencies in exhaust gas management and weight distribution, which can affect performance and ground clearance.

Innovation Solution

The exhaust pipe is configured with multiple portions that extend forward and backward from the engine, wrapping around it to increase length and improve exhaust silencing, while also utilizing a backward-inclined engine cylinder to balance weight and maximize space usage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the exhaust pipe is connected to the back side of the engine with a simple configuration, then the installation is easy, but the exhaust pipe length is insufficient

Engineering Contradiction:

Improveexhaust pipe lengthVSAvoidexhaust pipe configuration

Core Design Contradiction:

Length of moving objectVSDevice complexity

Solution Approach 1:

The exhaust pipe is divided into multiple portions (first portion extending forward from back side, second portion extending across the engine, third portion extending backward). This segmentation allows each portion to be optimized for its specific function while collectively achieving sufficient total length and proper routing around the engine.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The exhaust pipe transitions from a simple linear arrangement to a three-dimensional configuration that wraps around the engine. By utilizing the spatial dimension around the engine rather than just extending in a straight line, the pipe achieves sufficient length without excessive complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Weight of moving object

If the engine cylinder is inclined backward to maximize space usage, then the weight distribution improves, but the exhaust pipe routing becomes more complex

Engineering Contradiction:

Improveweight distributionVSAvoidexhaust pipe routing

Core Design Contradiction:

Weight of moving objectVSDevice complexity

Solution Approach 1:

The exhaust pipe routing is designed to adapt to the inclined cylinder configuration. The pipe dynamically adjusts its path by extending forward on one side, crossing to the other side in front of the engine, and returning backward, effectively accommodating the inclined cylinder while maintaining proper weight distribution.

Inventive Principle:

Principle #15Dynamics

3Object-affected harmful factors

If the exhaust pipe is made longer to improve silencing, then the exhaust noise reduction improves, but the ground clearance may be reduced

Engineering Contradiction:

Improveexhaust noiseVSAvoidground clearance

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The exhaust pipe uses curved paths rather than straight extensions to achieve its length. By wrapping around the engine in a curved configuration, the pipe gains sufficient length for effective silencing while maintaining adequate ground clearance, as the curved routing keeps the pipe away from the ground.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS8403100B2Vehicle and vehicle exhaust pipe

Publication Date: 2013.03.26 YAMAHA MOTOR CO LTD

AI summary

A vehicle, such as a motorcycle, can include an exhaust pipe connected to a back or rear side of an engine of the vehicle. An intermediate portion of the exhaust pipe can extend along a side of the engine from a rear portion connected to the rear side of the engine. A front portion of the exhaust pipe can extend from the intermediate portion along a front of the engine, and an exhaust portion can extend from the intermediate portion along a side of the engine opposite to the intermediate portion side.