UA9496U - Method for mecanism run-in - Google Patents

Abstract

Method for mechanism run-in, for example, Diesel engine, includes the modes of cold and hot running-in, duration of which is determined by the moment of achieving the set value of mechanical losses in the engine. In this case, into the running oil the organometallic additive of copper glycerate Cu3(C3H5O3)2 is added, and electric tribochemical process is achieved in such a manner that in the mode of cold running-in the direct current is supplied to the conjugate parts.

Description

Description of the invention

The invention relates to mechanical engineering, namely to the running-in of the mechanism after manufacture and 2 repair, in particular to the running-in of a diesel engine.

Known inventions that serve to run-in the mechanism after manufacturing and repair, for example, a method of running-in an internal combustion engine, which involves increasing the load while maintaining a constant effective value of the realizable part of the load-bearing capacity of the materials of friction couplings at each stage of running-in, and at the final stages partial short-term 70 unloading is carried out (11.

The disadvantage of the analogue is that the running-in process does not reduce its duration, as well as the complexity of the running-in modes.

The closest solution to the proposed method is the method of increasing the inter-repair resource of engines of mobile agricultural machinery, which involves electro-chemical-mechanical running-in of 19 cylinder-piston groups using an electrolyte that includes a mixture of seven parts by volume of glycerin and one part by volume of 2095 of an aqueous solution of MaMoO" |21.

The disadvantage of the prototype is that the process of electrochemical-mechanical running-in of the cylinder-piston group takes place at the stage of engine assembly, and not during the engine break-in process.

The purpose of this invention is to reduce the duration of break-in, improve the quality of the friction surfaces of mating parts and increase the durability of the engine as a whole.

The set goal is achieved due to the fact that the organometallic copper glycerate additive Siz(СзНьО»з)" is added to the running-in oil, and the electrotribochemical process is implemented in such a way that in the cold running-in mode, a constant current is applied to the coupled parts, the value of which can be determined according to the expression.

The claimed method is implemented on a break-in eye-brake stand with a direct current connection to a diesel engine, which is shown in the graphic material, where the current collector 1, which is screwed into the ratchet instead of the ratchet, crankshaft 2, piston 3, piston rings 4, housing cylinders 5, cylinder liner 6.

The break-in process begins with the initial cranking of a cold engine, performing break-in stages such as cold break-in without compression and cold break-in with compression. During the interaction of the engine elements, the thermal energy that is released during this causes (at a temperature of 200...220 C) the decomposition of copper glycerate Syz(SzNhOz)" ee, 30 . Dov. , 3- , . . on Cu copper ions" and active glycerate radicals (CzHuOz)7. The interaction of active radicals with the iron of the base (o) metal proceeds in a certain direction with the formation of iron glycerate Rez(CzHuO"z)", which is adsorbed by the "friction" surface. It should be noted that that this compound has a low shear resistance and causes accelerated wear-in of the working surfaces of the mating parts. (22)

Then a constant electric current is turned on and the run-in is carried out for some time. The connection of the direct current source is as shown in the figure, where the plus is supplied to the current collector 1, which is screwed instead of the ratchet, then through the crankshaft 2 and the piston Z to the piston rings 4, and the minus through the "cylinder body 5 to the cylinder sleeve 6 .

The value of the current can be determined according to the expression - hl - BVV A pe pot vFZh r. VbaZhu kos pu "» where 7 is the frequency of the crankshaft, s"; "х - specific electrical conductivity of the electrolyte, ΩM' m";

U - operating voltage. IN; со 45 Ар - the difference between the anode and cathode potentials, V;

G - the radius of the surface of the part in the friction zone, m; t. P - load on the friction unit, Pa; c 5 - diametric gap, m;

And the length of the piston ring, m; in 7 - output of metal by current; yah - dynamic viscosity of the lubricant, Pa s; " - linear speed, m/s.

Next, hot engine run-in modes are performed in a reduced time.

WITH; Thus, the method of running-in a mechanism, for example a diesel engine, provides an opportunity to improve the quality of the friction surfaces of the mechanism (elimination of damage to the friction surfaces, reduction of the amount of wear, coefficient of friction and thermal stress), shorten the duration of running-in and increase the durability of the mechanism as a whole.

Example: We will run in the SMD-6O diesel engine in the following modes. In the cold break-in mode, the crankshaft of the diesel engine is cranked at high speed by the electric machine of the stand. The operation of diesel lubrication and cooling systems must meet the following requirements: oil pressure in the main diesel line - not less than 0.08 MPa at the minimum crankshaft rotation frequency; oil temperature in the pan or in front of the oil radiator - up to 752C; the temperature of the coolant at the exit from the cooling system is no more than 802C. Crankshaft rotation frequency and break-in duration according to the table. because Next, we turn on the electric current, the parameters and duration of which are given in the table. Moreover, the electric current is supplied in such a way that the plus is connected to the cylinder body, and the minus to the crankshaft, as shown in the figure.

During hot running-in of diesel engines, the diesel engine is started at idling speed with the stand's electric motor or the diesel starting unit. During break-in without load, the temperature of the oil in the diesel pan and the coolant at the exit from the cooling system should be 60-952C. During hot break-in under load, it is performed at the position of the control body of the speed regulator, which corresponds to full fuel supply, successively increasing the load. Crankshaft rotation frequency and break-in duration in these modes according to the table. and yuyu 00011000 yuyu yuyu yuyu 00001005

Cold with electric current supply SHEOYAVA TA 00000020 1035

Hot without load Smooth increase from tip to tah

Hot with load Also 2 with

Sources of information about society 1. A. p. Mo. 1617171 (USSR). The method of running in the mechanism / A.V. Volchenkov, N.A. Bushe, B.N. Sokolov, V.V.

Zelensky, - Publ. in BY, 1990, Mo 48. (is) 2. A.s. Mo. 1811449 (USSR). The method of electrochemical and mechanical processing of cylinder-piston parts "t group / V.P. Alekseev, L.N. Boldar. Priority since 04/12/91. (22)

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Claims (1)

The formula of the invention A method of working in a mechanism, for example a diesel engine, which includes cold and hot break-in modes, the duration of which is determined by the moment of reaching the specified value of mechanical losses in the engine - which differs in that the metal-organic additive copper glycerate Siz(СzНоз) is added to the break-in oil. , and the electrotribochemical process is implemented in such a way that in the cold run-in mode, a direct current is applied to the coupled parts c, the value of which can be determined according to the expression;" seh vvvloy pa0O-- ar? r-veh M pu so 15 de 7 - crankshaft frequency, s; x - specific electrical conductivity of the electrolyte, Ohm! m"; t. M - working voltage, V; co A - the difference between the anode and cathode potentials, B; 50 G - the radius of the surface of the part in the friction zone, m; shi P - load on the friction unit, Pa; - diametral gap, m; Shaft 7 length of the piston ring, m; 7 - output of metal by current; Cho yak - dynamic viscosity of the lubricant, Pa s; k - linear speed, m/s. 60 b5