Shield Plate for Crank Chamber Coating Removal
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Solution Overview
Problem
Existing methods for removing excess sprayed coatings from the interior of a crank chamber in engines incompletely remove coatings from recessed areas and risk peeling off coatings from adjacent cylinder bores due to the directional alignment of high-pressure water jets.
Innovation Solution
A rotatable nozzle system with a shield unit that includes partition wall shields to direct high-pressure water jets precisely and prevent them from passing through communication holes, ensuring effective removal of excess coatings while protecting adjacent cylinder bore coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the injection direction of the nozzle is inclined toward the tip relative to the horizontal direction, then the excess sprayed coatings adhering to the recesses of the crank chamber can be more effectively removed, but the high-pressure water jet passes through the communication hole and impinges on the adjacent cylinder bore, resulting in peeling-off of the sprayed coating formed in the adjacent cylinder bore
Solution Approach 1:
A shield is introduced as an intermediary component between the high-pressure water jet and the adjacent cylinder bore. The shield is inserted into the crank chamber and positioned to block the communication hole, preventing the high-pressure water from passing through to the adjacent cylinder bore while allowing the jet to continue removing excess coating from the current chamber.
Solution Approach 2:
The crank chamber is divided into separate compartments by partition walls with communication holes. The shield is inserted into each compartment to independently control water jet flow, allowing selective removal of excess coating from each chamber while protecting adjacent chambers through the shield's blocking action.
2Productivity
If high-pressure water is jetted in a direction perpendicular to the axial direction of the nozzle, then the excess sprayed coatings can be removed from the crank chamber, but the high-pressure water fails to impinge on the recesses of the crank chamber, resulting in incomplete removal
Solution Approach 1:
The nozzle injection direction is changed from a perfectly horizontal perpendicular orientation to an asymmetric inclined direction toward the tip. This asymmetric angular adjustment allows the high-pressure water jet to effectively impinge on the recesses of the crank chamber while maintaining productivity in removing excess sprayed coating.
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 reliably removes excess coatings from the crank chamber while preventing peeling off of coatings from adjacent cylinder bores, effectively addressing the incomplete removal and peeling issues of previous methods.
Implementation Method 1
a rotatable nozzle that is inserted in a first small chamber among the plurality of small chambers, movable in a direction parallel to an axial direction of the cylinder bore communicating with the first small chamber, and jets high-pressure water toward a leading end side thereof
Implementation Method 2
The shields each have a block portion in a region facing the communication hole, the block portion shutting the high-pressure water that is jetted from the nozzle and passes through the communication hole
Data Source
AI summary
An excess sprayed coating removal device for removing excess sprayed coatings adhering to the inner surface of a crank chamber of a multi-cylinder engine includes: a rotatable nozzle inserted in a first small chamber, movable in a direction parallel to the axial direction of a cylinder bore communicating with the first small chamber, and jets high-pressure water toward the leading end side thereof; and at least a single of shields that are each inserted into a second small chamber adjacent to the first small chamber to face into a communication hole, the shields protecting from the high-pressure water a sprayed coating sprayed on the inner surface of the cylinder bore communicating with the second small chamber. The shields have a block portion in a region facing into the communication hole, the block portion configured to shut the high-pressure water jetted from the nozzle and passes through the communication hole.