Piston Cooling Channel Guide for Carbonization-Resistant Oil Flow
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Solution Overview
Problem
Existing piston designs for internal combustion engines with cooling channels suffer from uncontrolled agitation of cooling oil, leading to carbonization at high-temperature regions, which impairs heat transfer and cooling efficiency.
Innovation Solution
Incorporating a guiding element within the cooling channel that directs cooling oil towards the upper, radially inward region of the inner cooling channel wall, reducing the risk of carbonization and enhancing local cooling by using a lug structure that is partially circumferential and inclined, with outlet openings to facilitate efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling oil is injected into the cooling channel, then cooling effect is achieved, but uncontrolled agitation causes carbonization at high-temperature regions
Solution Approach 1:
The guiding element creates different flow patterns in different regions of the cooling channel. The upper radially inward region receives directed cooling oil flow to prevent carbonization, while other regions experience different agitation patterns. This local differentiation of flow quality resolves the contradiction by providing controlled cooling where needed without causing harmful carbonization.
Solution Approach 2:
The guiding element acts as an intermediary between the cooling oil and the cooling channel wall. It redirects the cooling oil flow to specifically target the upper radially inward region, mediating the interaction between cooling fluid and hot surfaces to achieve effective cooling while preventing carbonization through controlled flow direction.
2Loss of energy
If cooling oil is agitated in the cooling channel, then heat transfer is enhanced, but carbonized oil film forms and impairs heat transfer
Solution Approach 1:
The guiding element creates localized controlled agitation in the upper radially inward region where it is most needed for preventing carbonization, while avoiding excessive agitation in other regions that could lead to carbonized oil film formation. This spatially differentiated approach maintains heat transfer efficiency without compromising reliability.
3Temperature
If the cooling channel is reduced in radial width by the guiding element, then local cooling is enhanced, but flow passage is restricted
Solution Approach 1:
The guiding element reduces the radial width of the cooling channel only in the specific region where enhanced cooling is needed (upper radially inward region), while maintaining adequate flow passage in other regions. This localized geometric modification achieves improved local cooling efficiency without significantly restricting overall cooling oil flow rate.
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 effectively prevents carbonization and enhances cooling efficiency at vulnerable high-temperature regions, improving the overall performance and thermal management of the piston.
Implementation Method 1
at least one guiding element is arranged in the cooling channel (6), which has a lug (10) facing in the direction of an inner cooling channel wall (9) and disposed at least partially circumferentially, which is oriented in such a way that cooling oil (11) present in the cooling channel (6) is directed in the direction of an upper, and situated radially inwards, region of an inner cooling channel wall (9)
Implementation Method 2
If cooling oil is injected via an inlet opening into the cooling channel, this cooling oil is thrown around in the cooling channel because of the up-and-down movement of the piston and, in so doing, absorbs thermal energy and cools the piston at the same time
Implementation Method 3
The at least one guiding element (8) in this case is preferably formed in such a way that the cooling channel (6) is reduced to approximately 70 to 20% in its radial width at the height of the lug (10)
Data Source
AI summary
A piston of an internal combustion engine is disclosed. The piston includes a piston head with a piston bowl, a ring part and an annular cooling channel arranged between the ring part and the piston bowl. A closure element is provided to close the cooling channel in a direction away from the piston bowl. At least one guiding element is arranged in the cooling channel. The at least one guiding element provides a lug facing in a direction of an inner cooling channel wall and disposed at least partially circumferentially. The lug of the at least one guiding element is structured and arranged to direct cooling oil present in the cooling channel towards an upper region of the inner cooling channel wall relative to the closure element to facilitate cooling the upper region.