Engine Oil Circuit Nozzle for Compact Lubrication
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Solution Overview
Problem
Existing high-pressure fuel pump systems in motor vehicles face challenges in reducing engine size due to increased dimensions, and current lubrication methods are inefficient and costly, leading to issues with lubricant supply and cooling.
Innovation Solution
A lubrication circuit with a supply duct and lubrication duct that are coaxial and drilled using the same tools, featuring an annular ring nozzle to regulate oil flow, reducing manufacturing costs and ensuring precise positioning for effective lubrication of the high-pressure fuel pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the high-pressure fuel pump is positioned at one longitudinal end of the engine facing the coupling face, then the engine size is reduced, but the lubrication of the roller-cam contact becomes insufficient
Solution Approach 1:
The lubrication system is segmented into multiple independent oil supply channels (first channel, second channel, third channel) that deliver oil to different locations. This segmentation allows precise control of lubrication at the roller-cam contact point while maintaining compact engine layout.
Solution Approach 2:
The invention provides localized lubrication quality by directing oil through specific channels to the roller-cam contact area. The third channel specifically supplies oil to the roller bearing, ensuring adequate lubrication at this critical location despite the compact pump positioning.
2Device complexity
If conventional lubrication methods are used with oil jets in the tappet body, then the structure is simple, but the oil flow homogeneity and lubrication effectiveness are poor
Solution Approach 1:
The lubrication system is divided into multiple dedicated channels: a first channel for general lubrication, a second channel for bearing lubrication, and a third channel specifically for roller lubrication. This segmentation ensures each component receives optimized oil flow with proper homogeneity.
Solution Approach 2:
The invention introduces an intermediary oil distribution system with multiple channels and a T-piece connector that mediates between the oil source and the various lubrication points. This intermediary structure enables controlled, homogeneous oil distribution to each component.
3Reliability
If a separate lubrication circuit outside the fuel injection pump housing is used, then lubrication pressure and cooling are improved, but the system complexity and manufacturing cost increase
Solution Approach 1:
The lubrication circuit is merged with the fuel injection pump housing, forming an integrated structure. The oil channels are incorporated into the pump body itself, eliminating the need for separate external lubrication circuits while maintaining adequate lubrication pressure and cooling.
Solution Approach 2:
The pump housing serves multiple functions: it contains the fuel injection mechanism and simultaneously houses the lubrication circuit. The same structure provides both fuel pressurization and lubrication/cooling functions, reducing overall system complexity.
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
The solution reduces engine size constraints, provides efficient lubrication with controlled oil flow, and lowers manufacturing costs by simplifying the drilling process and ensuring precise oil distribution to the high-pressure pump.
Implementation Method 1
un oil flow reduction nozzle (30) reducing the cross-section of a flow of oil coming from the supply conduit (21)
Implementation Method 2
Effective lubrication of the moving parts of the high-pressure pump is therefore essential
Implementation Method 3
a roller (13) mounted to rotate relative to the tappet body around the fixed axis of rotation and a bearing disposed between the axis of rotation and the roller
Data Source
Figure 1~2
Figure 3~5
AI summary
A lubrication circuit for a combustion engine of a motor vehicle positioned at a longitudinal end of the engine turned toward the coupling face (100) of the engine, comprising: - a supply duct (21) for oil to a cylinder head, recessed in a cylinder casing, - a high-pressure pump (20) lubrication duct (25) activated by a cam solidly attached to an engine crankshaft, - an orthogonal longitudinal main oil supply ramp (20) connected to both ducts, characterized in that the supply duct (21) extends substantially parallel to the coupling face (100) in the extension of the lubrication duct (25) at one end of which an oil flow reduction nozzle (30) is arranged.