Axial fatigue performance testing device for connecting rod of high-power diesel engine and application method thereof

Abstract

The invention provides an axial fatigue performance testing device for a connecting rod of a high-power diesel engine and an application method thereof. The axial fatigue performance testing device comprises a lubricating device, a large-end fixture connected with a table of a fatigue testing machine and a small-end fixture connected with an actuating cylinder of the fatigue testing machine, wherein the large-end fixture is connected with the lubricating device through an oil return pipe, and the small-end fixture is connected with the lubricating device through an oil inlet pipe; the large-end fixture comprises a chassis simulation crankshaft pin and a large-end fixture mechanism, the small-end fixture comprises a top plate, a simulation piston pin and a small-end fixture mechanism, and the lubricating device comprises an oil tank, an oil outlet, an oil return port, a gear pump, a power switch, an overflow valve, a pressure gauge and a pressure gauge switch. The axial fatigue testingdevice has the characteristics of high rigidity, fatigue resistance, convenient assembly and disassembly and adjustable aperture, can be applicable to fatigue performance testing for large diesel engine connecting rods with different apertures, has the characteristics of circulation flow of lubricating oil and adjustable pressure of the lubricating oil through setting the lubricating device and can simulate the lubricating state of the connecting rod in service.

Description

technical field [0001] The invention relates to a testing device for mechanical properties of connecting rods, which belongs to the technical field of testing mechanical properties of structural parts, in particular to a testing device for axial fatigue performance of connecting rods of high-power diesel engines and a method for using the same. Background technique [0002] The connecting rod is the core part of the engine. Its function is to connect the piston and the crankshaft, convert the reciprocating motion of the piston into the rotational motion of the crankshaft, and output power outward. The connecting rod mainly bears the deflagration pressure from the cylinder, as well as the inertia force of the connecting rod itself and the movement of the piston. Its main failure mode is fatigue fracture. Fatigue performance testing is an indispensable item in the development and application of connecting rods. For the fatigue test of connecting rods of large diesel engines, d...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a high-power diesel engine connecting rod axial fatigue performance testing device and its use method to solve the problems of existing connecting rod fatigue testing devices in the prior art, such as simple structure, insufficient strength and rigidity, poor fatigue resistance, Due to the problems of non-adjustable shaft diameter and lack of lubrication design, this high-power diesel engine connecting rod axial fatigue performance test device has the characteristics of high rigidity, fatigue resistance, convenient disassembly and adjustable aperture, and can be applied to large diesel engine connecting rods with different apertures Fatigue performance test, in addition, provide a lubricating oil circulation device for large-scale diesel engine connecting rod fatigue test, which has the characteristics of lubricating oil circulation flow and adjustable lubricating oil pressure, and can simulate the lubrication state of the connecting rod when it is in service

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