Device and method for accurately measuring dead point on crankshaft of diesel engine

Abstract

The invention discloses a device for accurately measuring a dead point on a crankshaft of a diesel engine. The device comprises a guide rod, a positioning guide cylinder, a permanent magnet combination, a Hall sensor, a sensor support, and a signal processor. The positioning guide cylinder is positioned in an injector mounting hole of a cylinder head. The middle of the guide rod and the positioning guide cylinder are in clearance fit. The bottom of the guide rod abuts against the top surface of a piston. The permanent magnet combination is fixed on the top end of the guide rod. The Hall sensoris vertically supported on the upper portion of the sensor support, and the lower end of the Hall sensor is opposite to the center of the top end of a permanent magnet. The method comprises the stepsof: (1) installing the permanent magnet combination, the guide rod, and the positioning guide cylinder; (2) detecting the position of the dead point on the crankshaft. The measurement precision of the dead point on the crankshaft of the diesel engine can be increased to 0.1 degree to 0.2 degree by the device and the method for accurately measuring the dead point on the crankshaft of the diesel engine. The device, for accurately measuring the dead point on the crankshaft of the diesel engine with only once detection during the diesel engine assembling process, is efficient, and is easy to operate, thereby improving the assembling efficiency and the assembling quality of the diesel engine.

Description

technical field [0001] The invention relates to a device for accurately measuring the dead center position of a diesel engine crankshaft, in particular to a device and method capable of quickly and accurately measuring the upper and lower dead center positions of a medium-low speed marine diesel engine, belonging to the technical field of diesel engine assembly. Background technique [0002] Modern ships mainly use medium-speed diesel engines with a speed of 1500-3000rpm and low-speed diesel engines with a speed of less than 1500rpm as power devices. Such as figure 2 As shown, the crank neck 101 of the crankshaft 10 is hinged with the lower end of the connecting rod 20 and the upper end of the connecting rod 20 is hinged with the piston 30 in the frame 50 of the diesel engine. When the diesel engine is working, diesel droplets injected into the cylinder 40 are ignited by the spark plug and then explode to perform work, pushing the piston 30 to drive the connecting rod 20 to...

AI Technical Summary

Problems solved by technology

[0006] The operation is time-consuming and laborious. After the adjustment of the dead point position of the crankshaft during the assembly process, it is necessary to further check and adjust the dead point position of the crankshaft during the diesel engine test run

The measurement accuracy is poor, and the dead center position of the crankshaft can only be controlled at about 1°

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