Engine crankshaft gyroscopic moment testing device and testing method

Abstract

The invention provides an engine crankshaft gyroscopic moment testing device and method, the testing device comprises a rack, a moment detection device and a control system, and the moment detection device is slidably arranged on the rack along the butt joint direction of an engine; the torque detection device comprises a driving motor, a torque detection device, a rotating speed detection device, a transmission shaft and a crankshaft butt joint mechanism which are sequentially in transmission connection in the butt joint direction of the engine, and the crankshaft butt joint mechanism is telescopically arranged at the butt joint end of the transmission shaft and used for being in butt joint with an engine crankshaft to transmit torque; the driving motor, the torque detection device and the rotating speed detection device are electrically connected with the control system. According to the testing method, after the testing device is in butt joint with the engine, the torque detection device is started, the running torque information and the rotating speed information of the engine can be detected, whether the engine is abnormal or not is judged according to the torque information, if the engine is abnormal, maintenance is conducted, reworking at a follow-up station is avoided, and therefore the maintenance cost of products is reduced.

Description

technical field [0001] The invention relates to the technical field of engine testing, in particular to an engine crankshaft rotation torque testing device and testing method. Background technique [0002] The crankshaft and camshaft are important high-speed rotating transmission parts of the engine, and they are also indispensable parts of the engine timing system. If there are abnormalities in the inspection of these two components after installation, the engine will run abnormally, the performance will not meet the standard, the engine will be difficult to start, or the bearing bush will be damaged. Generally, the potential risks and factors affecting the engine performance during the installation process are as follows: [0003] 1. The grades of the upper and lower bushes of the crankshaft are used incorrectly, and the grades of the bearing bushes at different positions are used incorrectly, which will lead to differences in the frictional force of the crankshaft during ...

AI Technical Summary

Problems solved by technology

[0003] 1. The grades of the upper and lower bushes of the crankshaft are used incorrectly, and the grades of the bearing bushes at different positions are used incorrectly, which will lead to differences in the frictional force of the crankshaft during operation;

[0004] 2. Impurities appear between the upper and lower bearings of the crankshaft and the crankshaft, which will increase the rotational friction of the crankshaft and damage the crankshaft and the upper and lower bearings of the crankshaft;

[0005] 3. The upper and lower bearing bush grades of the crank connecting rod are used incorrectly, and the bearing bush grades of the crank connecting rod mechanism at different positions are used incorrectly, which will lead to differences in the friction force of the crank connecting rod during operation;

[0006] 4. Impurities appear between the upper and lower bearing shells of the crank connecting rod and the crankshaft, which will increase the rotational friction of the crank connecting rod and damage the crankshaft and the upper and lower bearing shells of the crankshaft.

[0007] 5. The piston and the piston ring do not match, such as the piston ring is deformed and damaged, or it is too large. When the piston reciprocates in the engine, the piston ring will rub against the inner wall of the cylinder, resulting in excessive resistance;

[0008] 6. There are scratches on the crankshaft journal, bearing bush, and connecting rod bush, and the contact surface is not smooth, resulting in abnormal resistance

[0011] 2. Leakage test of the whole machine: The leak test of the whole machine is mainly aimed at whether the engine water channel, oil channel, air channel, and engine block and cylinder head are defective and cause air leakage; at the same time, check whether the piston ring is abnormal, but the accuracy rate is not high ; and can not detect the bearing foreign matter

However, this method has high equipment cost and low cost performance, and it is late when the problem is found, and some parts of the engine are damaged, so it is difficult to repair and the cost is high

[0014] Some of the above detection methods can only detect part of the problem, and some have low accuracy; some equipment is expensive, although it can detect abnormalities, the maintenance cost of the engine after the abnormality is detected is high and the efficiency is low

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