The method of estimating the energy properties of motor oils

 

The invention relates to the field of study of lubricating oils, in particular to a method of assessing the energy properties of motor oils, and can be used in the development of new engine oils to assess their energy-saving properties, and can also be used in the selection of oil to the engine. The essence of the invention: method of estimating the energy properties of a vibrating tribometer SRV with a pair of friction ring-plane" measuring the coefficient of friction of the first oil (KTP1) when the load on the bearings (501) N, the temperature of the friction pair (801)oC, amplitude and frequency of the movement of rubbing pairs (1,50,1) mm and (501) Hz, respectively, and the coefficient of friction of the second oil (KTR2) under identical conditions, and about energy-saving properties of the second oil is judged by the dependence obtained experimentally. The technical result of the invention is to increase the information content of the method due to the possibility of quantitative evaluation of energy-saving properties of oils. 2 Il., 3 table.

The invention relates to the field of study of lubricating oils, in particular to the method of assessment of the key energy saving properties, and also used in the selection of oil to the engine.

As is known, increase reliability and efficiency of equipment is an important task. This task is solved as through further design improvement techniques and by improving the quality of used lubricants. In particular, by reducing the loss of energy to overcome the frictional forces provided by the manifestation of the anti-friction effect and are used motor oil, can be reduced by 5-12% of fuel consumption when operating machinery, as well as costs for maintenance and repair [1. Bunakov B. M., Grigoriev, M. A., Pervushin, A. N. Engine oil and fuel efficiency of the engine. - Automotive industry, 1984, 3, S. 9-11], associated with increased turnaround time of engine operation.

A known method of test oils on the stand with Jogging drums. The essence of the method is to test a full size sample of the equipment to operating conditions that simulate the real conditions of its application. In the tests using flow meters measure the instantaneous and total fuel consumption, which allows to judge about the ability of the oils to ensure fuel economy in their application in engineering.

The disadvantages of this innovation is sicnosti road transport. - M.: Transport, 1990, S. 112-119].

The authors had the task: to develop a rapid laboratory method for evaluating energy-saving properties of oils with acceptable degree of accuracy.

When conducting research, and the view of scientific literature, patent information was discovered a number of laboratory methods for the evaluation of anti-friction properties of motor oils, allowing to evaluate the ability of the tested oils to reduce friction when the engine and accurately judge their energy saving properties.

There is a method of evaluation in anti-friction properties of lubricants on the friction machines with point contact friction pair, for example on the machine CT-2 [3. Lubricants: Antifriction and antiwear properties. Testing methods: a Guide / P. M. Matveevskaya, C. L. lashi, I. A. Buyanovskaya and others - M.: Mashinostroenie, 1989, S. 28].

Also known way to assess anti-friction properties of lubricants on the friction machines with linear contact of the friction pair, for example on the machine of Timken [3. Lubricants: Antifriction and antiwear properties. Testing methods: a Guide / P. M. Matveevskaya, C. L. lashi, I. A. Buyanovskaya and others - M.: Mashinostroenie, 1989, S. 25]. The essence of these methods is inyh thermomechanical loads.

A common disadvantage of the above methods of evaluation in anti-friction properties of lubricating oils is the duration of the tests is due to the long pre-break-in of a pair of friction because of the rather rapid increase in the contact area during the experience.

Also known way to assess anti-friction properties of lubricating oils on tribometer with the contact of the friction surfaces in the space, devoid of the disadvantages of devices with line and point contacts, for example by car CMT-1 [3. Lubricants: Antifriction and antiwear properties. Testing methods: a Guide / P. M. Matveevskaya, C. L. lashi, I. A. Buyanovskaya and others - M.: Mashinostroenie, 1989, S. 31].

The closest in technical essence of the present invention is taken as a prototype method for evaluation of anti-friction properties of lubricating oils on the vibration tribometer SRV reciprocating friction pair "ring-plane [3. Lubricants: Antifriction and antiwear properties. Testing methods: a Guide / P. M. Matveevskaya, C. L. lashi, I. A. Buyanovskaya and others - M.: Mashinostroenie, 1989, S. 32].

Although this method is relatively above has advantages - Sina the internal combustion engine, allowing more to simulate the working conditions of the engine oil, but does not allow to judge about fuel economy when using the specific engine oil.

The technical result of the invention is the increase in the information content of the method due to the possibility of quantitative evaluation of energy-saving properties of oils.

This technical result is achieved in that in the method of estimating the energy properties of motor oils, including measurement of coefficient of friction on the vibration tribometer with a pair of friction ring-plane for the given load for a couple of friction, the temperature of the friction pair, the amplitude and frequency of the movement of the friction pair, and measuring the coefficient of friction of the first oil (KTP1) when the load on the bearings 501 H, the temperature of the friction pair 801oC, amplitude and frequency of the movement of the rubbing pair 1,50.1 mm and 501 Hz, respectively, and the coefficient of friction of the second oil (KTR2) under identical conditions, and about energy-saving properties of the second oil is judged according to the following dependence: e=andKTr+b, where e is an indicator of energy saving is 41.

ToTr- the relative change of the friction coefficient of the pair of the tested oils, %:In Fig. 1 schematically shows the friction vibration tribometer SRV, implements the method of estimating the energy properties of oils.

The friction consists of a base 1 with a heater 2, the bottom of the retainer 3, the holder 4 with the upper clamps 5 and a pair of friction plates 6 and ring 7. The filing of a load on pair of friction, heat it and bring in a reciprocating movement is performed automatically. Resistance to the relative movement of the friction pair is recorded by the load cell in the form of coefficient of friction (KTP1ToTR2) is displayed on a chart recorder (Fig.1 is not shown).

The method is implemented as follows. Cleansing & fat die 6 put 2 ml of the first oil and fix using the lower latch 3 on the base 1. The ring 7 by means of the upper clamps 5 is fixed in the holder 4. A pair of friction heated to 801oTo create a load on her 501 N, the amplitude and frequency of movement of the rubbing pair 1,50.1 mm and 501 Hz, respectively, and Pref) on the recorder. In the same way produce the definition of the coefficient of friction of the second oil (KTR2). Obtained values of the coefficient of friction oils put into the design formula and calculate the predicted fuel economy when using the second engine oil.

The conditions for testing oils selected according to the actual conditions of the working oil in the area of the first piston rings of internal combustion engine: the frequency of movement of the piston 30-50 Hz; the value of the contact pressure of 0.5 MPa is provided with a load equal to 50 N. According to the results of preliminary experiments established that the change of the amplitude of the relative movement of the pair of friction in the range of 1.0-2.0 mm material effect on the coefficient of friction does not, the stabilization of the obtained values of coefficient of friction in different conditions and on different oils comes after 4-5 min of the test.

When choosing the temperature conditions of the test were taken into account that in contrast to the periodic update of a thin layer of oil in the cylinder group of the engine, a pair of friction vibrationer oil change on the new portion was not made, i.e., the oil worked in harsher conditions. Aims of the study the coefficient of friction of various oils and oil compositions. These same oils and oil compositions were tested under field conditions in the engines of buses LiAZ-M, ZIL-130, VAZ-2106, URAL-5323, marine diesel engine 2NDV18, where it was determined the fuel consumption on these oils and calculated maximum received fuel economy. All this has allowed to draw a conclusion about energy saving capabilities of a specific oil. The results of the tests are presented in table.1, which shows that the best correlation was obtained at a temperature equal to 80oC.

Based on the results of the study, we constructed the dependence of the maximum fuel economy from the relative changes of the friction coefficient obtained vibrationer (Fig. 2), which is described by the equation y=a+b. Was regression analysis, the results of which the calculated coefficients a and b of the equation, which is equal to 0.17 and 1.41, respectively. Regression analysis showed that the obtained regression equation y=0,17 x+1,41 adequately describes the experimental data in the range of values of the relative changes of the friction coefficientToTrequal to 5-25%.

To determine the valid discrepancies between the results of two consecutive tests vibratable way tests were conducted oils to determine their energy saving properties. The results of the tests are presented in table.3.

Test results shows that the proposed method estimates the energy properties of the oils has a high degree of confidence.

Thus, a rapid laboratory method for assessment of energy-saving properties of motor oils, allowing 95% probability to predict the energy saving properties of motor oils by tests on the vibration tribometer SRV.

The use of the invention will promptly and reliably assess the energy saving properties of engine oils at low cost method.

Sources of information 1. Bunakov B. M. , Grigoriev, M. A., Pervushin, A. N. Engine oil and fuel efficiency of the engine. - Automotive industry, 1984, 3, S. 9-11.

2. Govorushchenko N. Ya, cost Savings and reduced toxicity in road transport. - M.: Transport, 1990, S. 112-119.

3. Lubricants: Antifriction and antiwear properties. Testing methods: a Guide / P. M. Matveevskaya, C. L. lashi, I. A. Buyanovskaya and others - M.: Mashinostroenie, 1989, S. 25, S. 28, s 31, s 32 (prototype).

Claims

The method of estimating the energy properties of motor oils, including metering greater is the temperature of the friction pair, the amplitude and frequency of the movement of rubbing pairs, wherein measuring the coefficient of friction of the first oil (KTP1) when the load on the bearings (501)N, the temperature of the friction pair (801)oC, amplitude and frequency of the movement of rubbing pairs (1,50,1) mm and (501) Hz, respectively, and the coefficient of friction of the second oil (KTR2) under identical conditions, and about energy-saving properties of the second oil is judged according to the following dependence: e=andToTr+
where e is the indicator of energy-saving properties of the oil (fuel economy), %;
a and b are constants obtained experimentally: a=0,17; in=1,41;
ToTr- the relative change of the friction coefficient of the pair of the tested oils, %:


 

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