Connecting rod fatigue testing device

Abstract

The invention discloses a connecting rod fatigue testing device. The connecting rod fatigue testing device comprises a base, a connecting rod and a loading device. One end of the connecting rod is fixed to the base, the other end of the connecting rod is loaded by the loading device, and the loading device repeatedly exerts continuously-changing pressure and tension on the connecting rod. The tension load and the pressure load change continuously from zero to the amplitude value, and the tension and the pressure are converted automatically instead of being exerted or removed forcefully, namely, the stress process of the connecting rod is continuous. Due to the fact that the connecting rod does not bear suddenly-changing loads, the problem of excessive shock is avoided, the phenomenon that a testing result is abnormal cannot occur and the accuracy and the reliability of the testing result are improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a connecting rod fatigue test device. Background technique [0002] The connecting rod is an important component in the engine. It has a connecting rod small end, a connecting rod large end and a connecting rod body connected between the two, wherein the connecting rod small end is used to install the piston pin and is connected to the piston; the connecting rod large end It is used to connect the crankpin, which in turn connects with the crankshaft. [0003] During the working process of the engine, the connecting rod is always under the pressure of the gas in the cylinder and the reciprocating inertial force, and transmits the interaction force between the piston and the crankshaft, for example, converting the reciprocating linear motion of the piston into the rotational motion of the crankshaft. At any moment in the four strokes of the engine, the force on the connecting rod ...

AI Technical Summary

Problems solved by technology

[0005] First, excessive impact often occurs during the loading process, resulting in abnormal test results, and the reliability of the test results is low;

[0006] Second, limited by objective reasons such as the structural form of the oil cylinder, the test loading frequency cannot be increased, and the test efficiency is low;

[0007] Third, hydraulic loading often produces loud noises, which are harmful to the health of workers;

[0008] Fourth, hydraulic oil is prone to leakage, which not only easily pollutes the workplace, but also may cause fire hazards and endanger safety

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