Auxiliary block for connecting rod fatigue test

Abstract

The invention discloses an auxiliary cushion block for a connecting rod fatigue test. The auxiliary cushion block is used as an auxiliary tool for the connecting rod pulling and pressing fatigue test. The auxiliary cushion block for the connecting rod fatigue test comprises a first wedge-shaped cushion block, a first wedge-shaped cushion block, a first circular-arc cushion block, a first shoulder cushion block and a second shoulder cushion block. The main problems that in the prior art, according to a traditional method for the connecting fatigue test, a big-end core rod and a small-end core rod are prone to being ineffective and being damaged, the effective data rate of the connecting rod pulling and pressing fatigue test is decreased, data collection and data effectiveness judgment are difficult to perform, the cost of the test is increased, and the rate of progress and efficiency of the test are lowered are solved. Through installing the auxiliary cushion block at the gap between the bottom of a groove and a connecting rod, the rigidity of the parts, at the gap position, of the sample and a clamp serving as two test combination bodies is improved, the capacity of the fatigue test is improved, the service life of the connecting rod is effectively prolonged, and meanwhile the auxiliary cushion block will not affect the precision of the connecting rod fatigue test and is high in practicability and suitable for application and popularization.

Description

technical field [0001] The invention relates to an auxiliary tooling for the tension-compression fatigue test of the connecting rod. The ability to test and improve the service life of the test mandrel. Background technique [0002] The connecting rod is an important component in the engine, which includes the connecting rod small end, the connecting rod large end and the connecting rod body connected between the two. Among them, the small end of the connecting rod is used to install the piston pin and connect with the piston; the large end of the connecting rod is used to connect the crank pin, and then connect 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 cran...

AI Technical Summary

Problems solved by technology

[0008] In the axial tension and compression fatigue test of the connecting rod, the traditional test method of the fatigue of the connecting rod is adopted, and the mandrels with large and small heads are prone to failure and damage. The reason is that the mandrel is also affected by the axial tension and compression of the connecting rod Influenced by fatigue load, its stress state is a bending fatigue state, and its stress state is even worse than that of the test connecting rod tension and compression fatigue state. Due to the harsh stress condition of the mandrel, when preparing the mandrel, the material of the mandrel In terms of selection, handling and mandrel design, etc., the testers will carry out serious research and experiment exploration. Although high preparation requirements are adopted for the mandrel, the failure probability of the mandrel is still high during the fatigue test, and With the change of modern engine design concepts, the application of turbocharging technology and the application of low-speed high-torque technology are becoming more and more popular, resulting in a decrease in the stress ratio of the tension-compression fatigue test of the connecting rod, and the condition of the fatigue test of the connecting rod will still become more serious. Unstable, the failure of the mandrel in the fatigue test is getting higher and higher, the effective data rate of the tensile and compression fatigue test of the connecting rod is reduced due to the failure of the mandrel in the test, and the difficulty of data collection and data validity judgment increases, and a large number of Connecting rod mandrel to support the continuation of the test, the cost of the test increases, the progress and efficiency of the test decrease, the test found that as the stress ratio value of the connecting rod design continues to decrease, the difficulty of the connecting rod mandrel to support the completion of the fatigue test process is also increasing Intensify, during the test process, more and more mandrels fail and fracture when they are used for the first time, even until the mandrel cannot support the completion of the fatigue test process of a single sample. Due to the emergence of this test situation, the testers are forced to find A test method that can change the test situation without affecting the purpose of the test

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