Piston Cooling Oil Jet Divider for Crown Underside
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Solution Overview
Problem
Modern pistons face challenges in effectively cooling the underside of the piston crown due to high thermal loading, as existing cooling methods are not sufficient to address this critical area.
Innovation Solution
A jet divider is integrated on the underside of the piston crown adjacent to the feed opening for cooling oil, with the injection nozzle positioned below it, directing part of the cooling oil jet towards the piston crown and the remaining part into the cooling channel, ensuring targeted and reliable cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single injection nozzle is used to supply cooling oil to the cooling channel, then the device complexity is reduced, but the cooling effectiveness of the piston crown underside is insufficient
Solution Approach 1:
The single cooling oil jet is segmented into two functional parts through the jet divider: one part is directed into the cooling channel for piston body cooling, while the other part is steered toward the piston crown underside for targeted cooling. This segmentation allows a single injection nozzle to fulfill multiple cooling functions that would otherwise require separate nozzles.
Solution Approach 2:
The jet divider acts as an intermediary element positioned between the injection nozzle and the cooling channels/piston crown underside. It mediates the cooling oil flow by dividing and redirecting it, ensuring that portion of the jet reaches the piston crown underside while another portion enters the cooling channel, thus solving the contradiction between simple nozzle configuration and effective cooling.
2Ease of operation
If the injection nozzle is oriented parallel to the piston center axis, then the cooling oil jet enters the cooling channel directly, but the piston crown underside cooling is inadequate
Solution Approach 1:
The jet divider is designed with asymmetric geometry featuring a first guiding face and a second guiding face with different orientations. The first guiding face directs cooling oil into the cooling channel, while the second guiding face angles toward the piston crown underside. This asymmetric design enables the single injection nozzle to achieve both direct cooling channel cooling and piston crown underside cooling without requiring multiple nozzles or complex orientation adjustments.
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 provides efficient and reliable cooling of the piston crown underside, optimizing thermal management by ensuring consistent cooling oil distribution during engine operation, regardless of piston position.
Implementation Method 1
The injection nozzle (30) is arranged below the jet divider (25) and is oriented toward the jet divider (25). The jet divider (25) causes part of the cooling oil jet (31) which is output by the single provided injection nozzle (30) to be steered at least temporarily in a targeted manner in the direction of the underside of the piston crown (13a)
Implementation Method 2
The cooling oil penetrates into the cooling channel and brings about cooling of the piston there in a manner known per se, in particular in the region of the piston head
Implementation Method 3
The cooling oil penetrates into the cooling channel and brings about cooling of the piston there
Data Source
AI summary
A sub-assembly may include a piston and an injection nozzle for cooling oil for an internal combustion engine. The piston may have a piston skirt and a piston head, where the piston may have a piston crown with an underside, a circumferential ring part, and in the region of the ring part, a circumferential cooling channel with at least one feed opening for the cooling oil. The piston may also have a jet divider for the cooling oil on the underside of the piston crown adjacent to the at least one feed opening. The injection nozzle may be arranged below the jet divider and may be oriented toward the jet divider.