Airbox Delivery Pipe Reinforcement for Engine Intake

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Solution Overview

Problem

Existing fuel supply devices for internal combustion engines disrupt air intake flow and increase pressure drop due to complex support structures within the airbox, leading to reduced engine performance and increased weight.

Innovation Solution

A fuel supply device with a delivery pipe integrated inside the airbox, supported at both ends, which functions as a reinforcing material, simplifying the internal structure and reducing intake air resistance without sacrificing airbox capacity, allowing smooth air flow and improved engine performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the auxiliary injector and fuel supply piping are arranged inside the airbox with bracket and support structures, then the fuel supply is secured, but the flow of intake air is disturbed and pressure drop is caused

Engineering Contradiction:

Improvefuel supply stabilityVSAvoidintake air flow disturbance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The fuel supply piping is extracted from the interior of the airbox and routed along the outer peripheral surface. This removes the piping and its support structures from the airbox interior, eliminating the disturbance to intake air flow while maintaining fuel supply functionality through the externally routed piping system.

Inventive Principle:

Principle #2Taking out (Extraction)

2Volume of stationary object

If the fuel supply piping is arranged outside the airbox, then the airbox capacity is maintained, but the intake air is easily influenced by pulsation and response is delayed

Engineering Contradiction:

Improveairbox capacityVSAvoidintake air response speed

Core Design Contradiction:

Volume of stationary objectVSSpeed

Solution Approach 1:

The side wall of the airbox serves dual functions: it acts as both the structural boundary of the airbox and as a support surface for mounting the fuel supply piping. By utilizing the outer peripheral surface of the airbox for piping installation, the design maintains airbox capacity while providing a stable mounting surface that reduces air pulsation influence.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the auxiliary injector and support structures are installed inside the airbox, then the fuel supply is secured, but the weight is increased and airbox reinforcement is not achieved

Engineering Contradiction:

Improvefuel supply stabilityVSAvoidoverall system weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The side wall of the airbox performs multiple functions simultaneously: it serves as the structural boundary of the airbox, provides mounting support for the fuel supply piping, and acts as a reinforcing element. This eliminates the need for separate support structures and brackets, reducing overall weight while maintaining fuel supply stability and airbox reinforcement.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9217401B2Fuel supply device for internal combustion engine

Publication Date: 2015.12.22 SUZUKI MOTOR CORP

AI summary

A fuel supply device for an internal combustion engine including a throttle valve and an airbox is provided with a main injector disposed at a downstream side of the throttle valve, an auxiliary injector disposed at an upstream side of the throttle valve and in the airbox, and a delivery pipe disposed inside the airbox and adopted to supply and distribute a fuel to the auxiliary injector. The delivery pipe has both ends which are supported on two side walls of the airbox.