Piston Pin Lubrication Layout Without Weakening the Pin Seat
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Solution Overview
Problem
Existing lubricating mechanisms for pin connection pairs in internal combustion engines either compromise structural strength or suffer from poor drainage and blockage issues, limiting their effectiveness in reducing friction and improving anti-seizure ability.
Innovation Solution
A lubricating mechanism featuring a piston with a cylindrical shape, including a lubricating passage and strategically positioned oil outlet orifices that direct lubricating medium directly to gaps between the connecting rod and pin seat, avoiding the need for a long communication passage and maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a communication passage penetrates the whole pin seat to deliver lubricating oil, then the lubrication effect for the pin connection pair is enhanced, but the structural strength of the pin seat is reduced
Solution Approach 1:
The communication passage is segmented into two parts: a first communication passage in the piston top portion and a second communication passage in the piston skirt portion. This segmentation allows the passage to be discontinuous, avoiding a long penetrating passage through the entire pin seat while still delivering lubricating oil to the pin connection pair, thus maintaining structural strength while providing adequate lubrication.
2Reliability
If DLC coating is applied on the pin surface to reduce friction, then the anti-seizure ability of the pin connection pair is improved, but the fabrication cost increases
Solution Approach 1:
The piston structure itself is designed to provide lubrication through integrated communication passages that deliver lubricating oil directly to the pin connection pair. This self-service lubrication system eliminates the need for expensive DLC coating while maintaining anti-seizure ability through adequate lubrication.
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 solution enhances lubrication efficiency without affecting structural strength, reducing friction, and improving anti-seizure ability while being cost-effective for large-scale production.
Implementation Method 1
the lubricating medium directly flows to a gap between the connecting rod and the pin seat portion via the opening
Data Source
AI summary
A lubricating mechanism of a pin connection pair of an internal combustion engine having a piston, a pin, and a connecting rod. The pin may be mounted in two pin seat portions of the piston such that the pin and one of the two pin seat portions form the pin connection pair. The lubricating mechanism may include a lubricating passage through which a lubricating medium is flowable and an oil outlet orifice communicating with the lubricating passage. The lubricating passage and the oil outlet orifice may be disposed in a piston top portion of the piston. An opening of the oil outlet orifice may face in an axial direction and may be disposed directly below a corresponding portion of the lubricating passage such that the lubricating medium is flowable via the opening directly to a gap defined between the connecting rod and a pin seat portion.