Die Casting Piston Ring Assembly with Radial Teeth
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Solution Overview
Problem
Existing die casting piston and ring assemblies face issues with seal reliability due to loss of elasticity from metal hardening and angular position instability, leading to potential piston seizure and metal infiltration.
Innovation Solution
A piston and ring assembly featuring a copper or steel piston with a sealing ring having a step-like cutout and radially protruding teeth that engage with conjugated seats on the piston, allowing elastic expansion and maintaining axial contact to prevent metal infiltration, while the teeth and seats configuration ensures angular stability and prevents the ring from turning relative to the piston.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a labyrinth seal with conjugated annular groove and rib configuration is used to prevent metal infiltration, then sealing reliability is improved, but the ring suffers from angular position stability problems due to lack of prevention against turning
Solution Approach 1:
The sealing ring features asymmetric protruding teeth with varying shapes and positions that correspond to asymmetric grooves in the piston. This asymmetric configuration creates a unique angular positioning system where only specific tooth-groove combinations fit properly, preventing the ring from rotating to incorrect angular positions while maintaining the labyrinthine seal.
Solution Approach 2:
The invention adds a new dimension to the sealing mechanism by incorporating protruding teeth that extend radially outward from the ring body. These teeth engage with corresponding grooves in the piston, creating a three-dimensional interlocking system that simultaneously provides sealing (radial dimension) and angular positioning (tangential dimension), solving both problems at once.
2Strength
If copper material is used for the sealing ring to reduce friction against steel container, then wear resistance is improved, but the ring still suffers from elasticity loss due to metal hardening between cycles
Solution Approach 1:
The sealing ring uses different materials for different functions: the main ring body is made of steel for structural strength and angular position stability, while the protruding sealing teeth are made of copper or copper alloy for low friction and high elasticity. This local differentiation allows each component to optimize its properties for its specific function, preventing both wear and elasticity loss.
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 assembly provides a reliable seal that maintains elasticity, prevents metal infiltration, and ensures angular stability, compensating for irregularities in the cylindrical chamber and pressure imbalances during the die casting process, and allows for selective ring positioning and bayonet-type mounting.
Implementation Method 1
a step-like shape of the cutout that confers elasticity to the ring, allows the latter to expand radially without the risk that molten metal may leak between the piston and the sealing ring
Implementation Method 2
radially protruding teeth that engage with conjugated seats on the piston, allowing elastic expansion and maintaining axial contact to prevent metal infiltration, while the teeth and seats configuration ensures angular stability and prevents the ring from turning relative to the piston
Data Source
AI summary
The invention relates to a die casting ring (1) internally fitted with radial teeth (11) to be engaged into matching seats (22) provided on a piston (2). This piston-ring assembly prevents mutual rotation or axial translation, in addition to ensuring an optimal seal against infiltration of liquid metal during the die casting process. When the ring has a cutout (10), it can be mounted accurately onto the piston because the teeth (11) allow the cutout to be positioned anywhere relative to the piston.