Piston Casting Device with Oblique Slider for Deep Recesses
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Solution Overview
Problem
The challenge in casting pistons for internal combustion engines is to minimize the use of lost cores that require reworking and to optimize weight savings, particularly in forming grooves below the ring zone, where existing methods often involve multiple linear and oblique core displacements.
Innovation Solution
A casting device with a linearly displaceable sleeve and an obliquely displaceable slider, coupled through a pivoting fork, allows for the formation of recesses below the ring zone with reduced core reconfiguration, enabling deeper recesses and weight savings by entraining the slider during the opening and closing movements, with adjustable guide angles for various piston geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional linearly displaceable sleeves and cores are used for piston casting, then the basic piston structure can be formed, but deeper recesses below the ring zone cannot be formed effectively and weight savings are limited
Solution Approach 1:
The core system transitions from simple linear displacement to dynamic combined linear and oblique displacement. The sleeve can move linearly while the core simultaneously performs oblique displacement through engagement with the slider, enabling deeper recess formation. This dynamic coordination allows the core to achieve complex movement paths without adding separate independent mechanisms.
Solution Approach 2:
The slider acts as an intermediary element between the sleeve and the core. It receives the oblique displacement force from the sleeve and transmits it to the core, enabling the core to achieve oblique movement. This intermediary mechanism simplifies the overall system by using a single slider to coordinate multiple movement directions rather than requiring separate mechanisms for each direction.
2Shape
If multiple linear and oblique core displacements are used to form grooves below the ring zone, then recesses can be formed, but the number of lost cores increases and reworking is required
Solution Approach 1:
The invention merges the linear displacement function of the sleeve with the oblique displacement function of the core into a single coordinated operation. By coupling the sleeve's linear movement with the core's oblique movement through the slider mechanism, both recess formation functions are combined in one process step, reducing the number of separate operations and minimizing lost cores.
Solution Approach 2:
The sleeve is retracted in advance before the core displacement begins. This preliminary action creates the necessary space and conditions for the core to perform its oblique displacement without interference. By preparing the system state beforehand, the subsequent combined movement can proceed smoothly without requiring additional corrective actions or reworking.
3Length of moving object
If the sleeve is coupled to the slider for entrainment during opening and closing movements, then deeper recesses can be formed, but the coupling mechanism becomes more complex
Solution Approach 1:
The slider serves as an intermediary that mediates the coupling between the sleeve and the core system. It receives the entrainment force from the sleeve during opening movements and transmits it to the core, enabling deeper recess formation. The slider's geometric shape and positioning naturally provide the coupling function without requiring additional complex mechanisms.
Solution Approach 2:
The coupling mechanism utilizes the existing linear displacement capability of the sleeve and the geometric arrangement of the slider to automatically achieve the desired oblique core displacement. The system self-regulates the coupling through the natural movement paths and geometric constraints, eliminating the need for external control mechanisms or complex actuation systems.
Data Source
AI summary
A piston for an internal combustion engine includes a mostly linearly displaceable sleeve for forming at least one piston pin bore and at least one slider that can be displaced at least mostly linearly and diagonally to the sleeve for forming at least one recess under a ring zone of the piston. The sleeve and the slider are at least indirectly coupled, such that the sleeve at least partially carries the slider when displaced. A method for opening and/or closing a casting device for a piston for an internal combustion engine, wherein a mostly linearly displaceable sleeve at least partially carries a slider that can be displaced mostly linearly and diagonally to the sleeve.