Vehicle Exhaust Silencer Inversion for Compact Noise Attenuation

Solution Overview

Problem

The existing exhaust pipe structure for vehicles with a silencer under the engine faces challenges in simplifying the internal structure and enhancing silencing performance while maintaining a reduced size, as the flow of exhaust gas is reversed inside the silencer, leading to increased volume and weight due to complex communication pipes.

Innovation Solution

The exhaust pipe structure features a silencer inlet at the rear of the vehicle body and a silencer outlet at the front, ensuring unidirectional exhaust gas flow, which simplifies the internal structure and reduces the volume occupied by communication pipes, thereby improving silencing performance without increasing the silencer's size. Additionally, the exhaust pipe is configured with reversal pipes and outlet formation pipes to enhance output characteristics and aesthetic appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the silencer inlet is provided at the rear of the vehicle body, then output characteristics are improved, but the internal structure becomes complicated and silencing performance decreases

Engineering Contradiction:

Improveoutput characteristicsVSAvoidinternal structure

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent inverts the conventional exhaust flow direction by providing the silencer inlet at the rear and outlet at the front, making exhaust gas flow in the same direction as vehicle travel. This inversion eliminates the need for complex internal communication pipes and flow reversals, thereby simplifying the internal structure while maintaining improved output characteristics.

Inventive Principle:

Principle #13The other way round (Inversion)

2Power

If the silencer inlet is provided at the rear of the vehicle body, then output characteristics are improved, but silencing performance decreases

Engineering Contradiction:

Improveoutput characteristicsVSAvoidnoise

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional exhaust flow direction by providing the silencer inlet at the rear and outlet at the front, making exhaust gas flow in the same direction as vehicle travel. This inversion eliminates the need for complex internal communication pipes and flow reversals, thereby simplifying the internal structure while maintaining improved output characteristics.

Inventive Principle:

Principle #13The other way round (Inversion)

3Object-affected harmful factors

If the size of the silencer is increased to maintain silencing performance, then silencing performance is maintained, but weight increases

Engineering Contradiction:

ImprovenoiseVSAvoidweight

Core Design Contradiction:

Object-affected harmful factorsVSWeight of stationary object

Solution Approach 1:

The patent inverts the conventional exhaust flow direction by providing the silencer inlet at the rear and outlet at the front, making exhaust gas flow in the same direction as vehicle travel. This inversion eliminates the need for complex internal communication pipes and flow reversals, thereby simplifying the internal structure while maintaining improved output characteristics.

Inventive Principle:

Principle #13The other way round (Inversion)

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 simplifies the internal structure of the silencer, enhances silencing performance, reduces weight, and improves output characteristics and aesthetic appearance by maintaining a compact silencer size while ensuring effective noise attenuation and operability.

Implementation Method 1

In the silencer, exhaust noise is attenuated by an expansion effect when exhaust gas enters the respective expansion chambers.

Methodology Applied

Scientific EffectExpansion effect:

Data Source

PatentUS9611770B2Exhaust pipe structure for vehicle

Publication Date: 2017.04.04 SUZUKI MOTOR CORP

AI summary

It is possible to simplify an internal structure of a silencer and it is possible to improve silencing performance while suppressing the increase of the size of the silencer. An exhaust pipe structure is constituted by an exhaust pipe (45) which is connected to an engine (4), and a silencer (43) which is disposed under the engine. A silencer inlet (43a) through which exhaust gas is introduced into the silencer is provided in the silencer and at the rear of a vehicle body. The exhaust pipe has a rear portion reversal pipe (62) by which a direction of an exhaust stream flowing rearward is reversed into a frontward direction. A downstream end side of the rear portion reversal pipe is connected to the silencer inlet. A silencer outlet (43b) through which exhaust gas is discharged from the silencer is provided in the silencer. The silencer outlet is provided at the front of the vehicle body. Thus, exhaust gas can flow inside the silencer unidirectionally from the rear toward the front.