Experimental studies of the influence of mounting deformations of a diesel cylinder on its performance
The article presents the results of experimental studies of changes in the inner diameter of the cylinder of air-cooled multi-purpose diesels from the action of mounting forces, as well as the patterns of the influence of mounting deformations of a diesel cylinder on its performance. The internal diameter of the investigated cylinders was measured on a control and measuring machine after the application and removal of mounting forces. To simulate the application of mounting forces, a cassette device was made that simulated the upper part of the diesel crankcase and the cylinder head, and made it possible to measure the internal diameter of the cylinder in a stressed state. It is figured out that cylinder deformations are elastic. In particular, when measuring cylinders with diameters of 85 mm and 95 mm, the fact of restoration of the original internal diameter after application and removal of mounting forces was established. It was also experimentally established that under the influence of mounting forces, the stability of the geometry of the working surface of the cylinder deteriorates with an increase in its inner diameter, in particular, for a 95 mm cylinder, diameter changes during installation can exceed 20 microns in some zones. To increase the stability of the cylinder geometry, the technology of honing cylinders in a stressed state (in cassette devices) was tested and an experimental assessment of its effectiveness was carried out. The test results of the TMZ-650D diesel engine with serial and experimental cylinders are presented. It is shown that a diesel engine with an experimental cylinder at an operating time of 13 hours has effective indicators that fully comply with the requirements of specification and are almost equal to a diesel engine with serial cylinders at an operating time of 21 hours.