Hybrid Pin Axial Securement via Sleeve Profile and Core Compression
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Solution Overview
Problem
The existing hybrid pins for internal combustion engines lack securement of the core within the sleeve, leading to axial displacement and insufficient axial pressed composite tensions, which hampers the strength of the hybrid pin.
Innovation Solution
The hybrid pin is designed with a steel sleeve and a light-metal alloy core, where the inner profile of the sleeve secures the core to prevent axial displacement, allowing for the buildup of pressed composite tensions through a cold-forming process using a pressing apparatus with a die and punch system, and optionally enhanced with surface hardening or coatings for improved friction-wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the core is pressed into the sleeve without axial securement, then the manufacturing process is simple, but the core can displace axially and pressed composite tensions cannot build up
Solution Approach 1:
The sleeve interior is given a localized profiled structure (convexities or grooves) at specific positions rather than changing the entire sleeve structure. This local profiling provides axial securement for the core while maintaining the overall simplicity of the manufacturing process. The profiled regions create mechanical interlocking that prevents axial displacement without requiring complex overall design changes.
2Ease of operation
If the core is allowed to undergo elastic shape changes axially, then the core can be easily inserted, but axial pressed composite tensions cannot build up to improve strength
Solution Approach 1:
The core is preliminarily compressed axially during the pressing process to exceed its elastic limit, creating permanent plastic deformation that shortens the core. This preliminary compression action ensures that when the core is inserted into the sleeve, it remains shorter than the sleeve length, preventing axial displacement and maintaining pressed composite tensions without requiring complex retention mechanisms.
3Stability of the object's composition
If the core is made shorter than the sleeve to prevent displacement, then axial securement is achieved, but the core must undergo significant plastic deformation
Solution Approach 1:
The pressing process utilizes parameter changes by applying controlled axial compression forces to the core, transforming it from its initial state to a permanently shortened state. By carefully controlling the compression magnitude to exceed the elastic limit but remain within acceptable plastic deformation ranges, the core achieves the necessary length reduction for stability while maintaining manufacturability and avoiding excessive deformation that would compromise material properties.
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 design enhances the strength of the hybrid pin by maintaining pressed composite tensions, improving its ability to withstand stress and ensuring the core is securely fixed within the sleeve, thereby increasing the hybrid pin's overall strength.
Implementation Method 1
a core (2) made of a light-metal alloy that can be cold-formed
Implementation Method 2
the core (2) is compressed in the axial direction by means of the pressing punch (13), so that the core (2) undergoes plastic deformation and becomes slightly shorter than the sleeve (3) in the axial direction
Implementation Method 3
When the pressure of the pressing punch (13) on the core (2) decreases after the pressing process, the core (2) no longer lengthens again because of its elasticity
Data Source
AI summary
The invention relates to a hybrid pin (14) for connecting a piston for an internal combustion engine to a piston rod, the hybrid pin (14) consisting of a sleeve (3) made of steel and consisting of a core (2) which is pressed into the sleeve (3) and which is made of a lightweight metal alloy that can be cold-formed. The inner surface of the sleeve (3) has a profile, whereby an elastic elongation of the core (3) in the axial direction after the core (3) is pressed into the sleeve (3) is prevented to such an extent that the sleeve (3) is longer than the core (2) at both ends of the hybrid pin (14).