Lubrication arrangements for maintaining piston pin oil pressure in two-stroke cycle, opposed-piston engines

Abstract

The present disclosure provides a lubrication arrangement for a piston pin of a piston in a two-stroke cycle opposed piston engine. A two-stroke cycle, opposed-piston engine for the piston-piston-pin lubrication arrangement minimizes oil pressure loss at the piston pin and reduces the required oil supply pressure to the engine as the piston approaches bottom dead center. The piston pin is configured to absorb and store oil pressure energy when the oil pressure at the piston pin is high, and to release this stored energy to pressurize the oil at the piston pin when the connecting rod oil pressure is low.

Description

technical field [0001] The present application contains subject matter related to that of US Patent Application 13 / 136,955, filed August 15, 2011, entitled "Piston Constructions for Opposed-Piston Engines," and published as US 2012 / 0073526 on March 29, 2012, and 2013 US Patent Application No. 13 / 776,656, filed February 25, 2014, entitled "Rocking Journal Bearings for Two-Stroke Cycle Engines," and published August 28, 2014 as US 2014 / 0238360 A1. Background technique [0002] The field is lubrication management for two-stroke cycle engines. More specifically, the present application relates to embodiments of a piston pin oil pressure recovery device for a piston of a two-stroke cycle, opposed-piston engine. [0003] Piston pins in reciprocating engines must be lubricated to mitigate the risk of high load asperity contact in the joint. If the rough surface contact in the joint is maintained at high loads, excessive friction, wear and even catastrophic damage is possible. Th...

AI Technical Summary

Problems solved by technology

However, increasing the full engine oil pressure for piston pin lubrication only as the engine's RPM increases can result in oil pressure exceeding that required by the rest of the engine's lubrication system

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