Emergency Guiding Element for Piston Pin Damage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In internal combustion engines, a piston demolition can cause significant damage to the cylinder liner as the connecting rod reciprocates unguided, leading to costly engine failures due to the large clearance between the piston pin and the inner cylinder wall in existing designs.
Innovation Solution
The integration of emergency guiding elements attached to the piston pin, which are designed to contact the inner cylinder wall only in case of piston demolition, providing guided movement to the connecting rod and reducing damage by maintaining a minimal distance from the cylinder wall during normal operation and extending to contact points during a piston failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston pin is designed with large clearance from the inner cylinder wall during normal operation, then the piston pin can move freely and reduce friction, but in case of piston demolition the connecting rod reciprocates unguided causing significant damage to the cylinder liner
Solution Approach 1:
The piston pin assembly is segmented into functional zones: the main piston pin body with clearance for normal operation, and separate emergency guiding elements (such as guide rings or protrusions) that extend toward the cylinder wall. This segmentation allows the piston pin to maintain freedom of movement during normal operation while providing guided movement through the emergency elements when piston demolition occurs.
Solution Approach 2:
The emergency guiding elements are pre-positioned on the piston pin assembly during manufacturing, extending partially toward the cylinder wall but not contacting it during normal operation. This preliminary positioning ensures that when piston demolition occurs, the guiding elements are already in place to immediately provide guidance and prevent unguided reciprocation of the connecting rod.
2Object-affected harmful factors
If emergency guiding elements are added to the piston pin assembly, then damage to the cylinder liner is reduced in case of piston demolition, but the device complexity and manufacturing cost increase
Solution Approach 1:
Instead of making the entire piston pin assembly complex, only specific local areas are modified to include emergency guiding elements. These elements are strategically positioned at the ends of the piston pin where they can effectively contact the cylinder wall during emergency situations, while the rest of the piston pin maintains its simple, easy-to-manufacture design.
Solution Approach 2:
The emergency guiding elements are designed as simple, inexpensive components that can be easily manufactured and attached to the piston pin. They serve their protective function during emergency situations and can be replaced along with the piston pin assembly, making them cost-effective despite adding to the overall device complexity.
3Stability of the object's composition
If the emergency guiding elements contact the inner cylinder wall during normal operation, then they provide continuous guidance, but they increase friction and reduce engine efficiency
Solution Approach 1:
The emergency guiding elements are designed with dynamic characteristics that allow them to remain inactive during normal operation, extending toward but not contacting the cylinder wall. When piston demolition occurs, the change in mechanical conditions causes the guiding elements to engage with the cylinder wall, providing guidance only when needed. This dynamic behavior eliminates unnecessary friction during normal operation while ensuring stability during emergencies.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present disclosure generally relates to piston pins connecting pistons and associated connecting rods. An emergency guiding element (30, 31) may be configured to be attached to an end (18, 20) of a piston pin (10) .The emergency guiding element (30, 31) may be integrally formed with an emergency guiding outer wall (34) facing an inner cylinder wall (4). The emergency guiding element outer wall (34) may be configured to contact the inner cylinder wall (4) only in case of a demolition of the piston (6). Thus, an emergency guidance for an associated connecting rod may be provided.