Offset Fuel Rail Protrusions for Ignition Plug Clearance
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Solution Overview
Problem
In internal combustion engines, the conventional fuel rail design often interferes with ignition plugs when mounted in center-injection engines, leading to increased cylinder head size or the rail being positioned far away, which affects engine compactness and efficiency.
Innovation Solution
A fuel rail design featuring a tubular rail body with protrusion portions and extension portions that offset the rail body's position, allowing for non-interfering installation and reduced cylinder head size, while maintaining efficient fuel distribution to fuel injectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the connecting portion is formed long to accommodate center-injection engine bores, then the fuel injector can be properly connected, but the ignition plug and rail body interfere with each other
Solution Approach 1:
The patent introduces protrusion portions that extend in a direction substantially perpendicular to the axial direction of the rail body. This dimensional change allows the rail body to be positioned laterally offset from the bore axis, resolving the interference between the ignition plug and rail body while maintaining proper fuel injector connection through the extension portions.
2Volume of moving object
If the rail body is arranged at an extremely near position to the cylinder head, then engine compactness is improved, but the ignition plug cannot be properly arranged
Solution Approach 1:
The protrusion portions extend in a direction substantially perpendicular to the axial direction of the rail body, creating lateral offset space. This allows the rail body to be positioned close to the cylinder head while providing sufficient space for ignition plugs to be arranged in the front-back direction between the bores.
3Object-affected harmful factors
If ignition plugs are arranged in left-right direction of the rail body, then interference is avoided, but the size of the cylinder head in left-right direction increases
Solution Approach 1:
The protrusion portions create lateral offset space that allows ignition plugs to be arranged in the front-back direction between the bores rather than in the left-right direction. This dimensional reorganization avoids interference while maintaining compact cylinder head dimensions.
Data Source
AI summary
A tubular rail body has an inlet for introducing a fuel therein from a fuel supply source. A plurality of tubular protrusion portions project from the rail body in a substantially vertical direction relative to an axial direction of the rail body, and are arranged at a predetermined interval in the axial direction. A tubular extension portion extends from each of the protrusion portions in a substantially vertical direction relative to both an axial direction of the protrusion portions and the axial direction of the rail body. The tubular extension portion is inserted into a bore which extends from an exterior of an internal combustion engine to a combustion chamber. A connecting portion is formed on an end portion of the extension portion opposite to the protrusion portion and is fluidly connected with a fuel injector inserted in the bore.