Lubricating and cooling combined structure of engine piston and connecting rod group

Abstract

The invention belongs to the technical field of machinery and proposes a lubricating and cooling combined structure of an engine piston connecting rod group. A combined lubricating and cooling structure for an engine piston and connecting rod group proposed includes a connecting rod lubricating structure and a piston cooling structure; the connecting rod lubricating structure has a connecting rod journal oil hole (8) located on the connecting rod journal of the crankshaft; The rod journal oil hole (8) is a radial through hole located on the connecting rod journal of the crankshaft and communicates with the main oil passage of the diesel engine; the upper end of the small end of the connecting rod (13) is provided with a guide for communicating with the piston cooling structure. The oil jacket (27); the inner cooling cavity (25) of the piston cooling structure; the upper end outlet of the oil guide sleeve (27) is located in the inner cooling cavity (25); the outer cooling cavity (25) is provided with an outer cooling cavity ( twenty three). The cooling of the piston and the lubricating of the connecting rod in the invention share the same engine oil passage, the design is simpler, the reliability is higher, and the lubricating and cooling efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to a lubricating and cooling combined structure of an engine piston connecting rod group. Background technique [0002] The piston connecting rod group is an important transmission part of the engine. It transmits the pressure of the combustion gas to the crankshaft, making the crankshaft rotate and output power. The piston connecting rod group is composed of pistons, piston rings, piston pins, connecting rods and other parts; pistons and cylinders The cover constitutes the combustion chamber, bears the gas expansion pressure, transmits the power to the crankshaft through the piston pin and the connecting rod, and is driven by the connecting rod to complete the three auxiliary strokes of intake, compression and exhaust; [0003] The piston consists of two parts, the head and the skirt. The piston head is cut with a number of annular grooves for the installation of piston rings. The...

AI Technical Summary

Problems solved by technology

The pistons of many existing engines use cooling nozzles to supply oil for cooling. For example, the patent "An All-steel Piston with an Introduced Cooling Oil Chamber" (CN202883148U) adopts this structure. The cooling nozzles are installed on the body, and the pistons are reciprocating. Among them, the distance between the nozzle and the oil inlet hole of the piston varies from time to time, and the amount of oil sprayed into the piston cooling chamber is sometimes too much, and the cooling of the piston is not sufficient; Small particles may cause nozzle blockage, and serious blockage will cause the piston to scuff the cylinder

The bushing at the small end of the connecting rod and the piston pin are usually lubricated by splashing. The lubricating oil usually comes from the engine oil scraped off by the piston ring from the cylinder liner. The oil pressure is low, the flow rate is slow, and it is easy to entrain the metal shavings scraped off by the piston ring from the cylinder liner. Then scratch the small end bushing of the connecting rod

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