Test method for evaluating wear resistance of engine oil timing chain

Abstract

The invention discloses a test method for evaluating the wear resistance of an engine oil timing chain, which specifically comprises the following steps: respectively mixing and uniformly stirring catalysts ferric acetylacetonate and ferrocene with two or more than two pieces of engine oil to be tested, then introducing gas into a reactor of a testing machine, and carrying out oxidation reaction to obtain oxidized oil; oxidized oil is injected into a test oil box of a testing machine, a test pin and a V-shaped block are placed in the testing machine, after the test oil box is sealed, a test is carried out, and the wear resistance of a test oil product is evaluated through weightlessness of the test pin and the V-shaped block before and after the test; and the oil product with small weight loss has good wear resistance. According to the method, the experimental principle, the contact motion type of the test piece and the material have good correspondence with the MS program X engine bench test, and the method can be used as a screening measure for evaluating the performance of the automobile engine oil in the MS program X bench test. In addition, the method is low in test cost, short in test period and capable of being popularized and used on a large scale.

Description

Technical Field

[0001] The invention belongs to the technical field of engine oil friction and wear evaluation methods, and in particular relates to a test method for evaluating the anti-wear performance of an engine oil timing chain. Background Art

[0002] In order to deal with the problems such as timing chain wear caused by the widespread application of new engine technologies such as direct injection and turbochargers, SP / GF-6, JASO GLV-1 specifications (JASO M364:2019), ACEA A7 / B7-21 and C6-21, and GM's third-generation DEXOS1 specifications all require the use of the MS program X bench test to evaluate the timing chain wear protection performance of engine oil. However, there are no relevant bench evaluation resources for the MS program X bench test in China. If the development of SP / GF-6-level oil products is to be carried out, the oil products need to be sent abroad for testing, which makes the test have the disadvantages of long test cycles and huge costs. Therefore, it is necessary to study and establish a simulation test method for evaluating the anti-wear performance of engine oil timing chains.

[0003] Foreign literature reported that the steel column and steel disc of the SRV testing machine were used as friction pairs, and the wear depth after the steel disc test was measured to evaluate the anti-wear performance of SP / GF-6 engine oil. However, the literature did not give the correspondence between the MS program X bench test and could not solve the problem of using simulation experiments to screen the formula. Summary of the invention

[0004] The purpose of the present invention is to provide a test method for evaluating the anti-wear performance of an engine oil timing chain, which can quickly and simply evaluate the anti-wear performance of an engine oil timing chain.

[0005] The technical solution adopted by the present invention is a test method for evaluating the anti-wear performance of engine oil timing chain, which is specifically implemented according to the following steps:

[0006] Step 1, respectively mixing the catalysts ferrous acetylacetonate and ferrocene with two or more engine oils to be tested, stirring them evenly, and then introducing gas into the reactor of the test machine to perform oxidation reaction to obtain oxidized oil;

[0007] Step 2, inject the oxidized oil into the test oil box of the testing machine, and place the test pin and V-block in the testing machine. After sealing the test oil box, conduct the test, and evaluate the anti-wear performance of the test oil by the weight loss of the test pin and V-block before and after the test; the oil with small weight loss has good anti-wear performance.

[0008] The present invention is also characterized in that:

[0009] In step 1, during the oxidation reaction, the stirring rate is 200 rpm, the reaction temperature is 80° C. to 150° C., and the reaction time is 72 h to 160 h.

[0010] In step 1, the gas is a mixture of air and nitrogen dioxide.

[0011] The air flow rate is 10-15L / h; the nitrogen dioxide flow rate is 0.06mL / h-0.14mL / h.

[0012] In step 2, the temperature of the test oil box is 80°C to 120°C, the rotation speed is 290Rpm, the test load is 200blf to 500blf, and the test time is 60min to 120min.

[0013] Beneficial effects of the present invention: The method of the present invention has good correspondence with the MS program X engine bench test in terms of experimental principle, contact motion type and material of the test piece, and can be used as a screening measure for the MS program X bench test for evaluating the performance of automobile engine oil. In addition, the method of the present invention has low test cost and short test cycle, and can be promoted and used on a large scale. DETAILED DESCRIPTION

[0014] The present invention is described in detail below in conjunction with specific implementation modes.

[0015] The test method for evaluating the anti-wear performance of engine oil timing chain of the present invention is specifically implemented according to the following steps:

[0016] Step 1, mixing the catalysts ferrous acetylacetonate and ferrocene with two or more engine oils to be tested respectively, stirring them evenly, and then introducing the gases into the reactor of the test machine and performing oxidation reactions respectively to obtain oxidized oils;

[0017] There are at least two types of engine oils to be tested; and an oxidation reaction is performed by mixing catalysts ferric acetylacetonate and ferrocene with the engine oils to be tested respectively;

[0018] During the oxidation reaction, the stirring rate is 200 rpm, the reaction temperature is 80°C to 150°C, and the reaction time is 72h to 160h;

[0019] The gas is a mixture of air and nitrogen dioxide; the flow rate of air is 10-15L / h; the flow rate of nitrogen dioxide is 0.06mL / h-0.14mL / h;

[0020] The test machine is an engine oil high temperature oxidation ROBO test machine;

[0021] Step 2, injecting the oxidized oil into the test oil box of the FALEX V-block test machine, in which the test pin and the V-block are placed, and after sealing the test oil box, the anti-wear performance is evaluated;

[0022] The temperature of the test oil box is 80°C to 120°C, the rotation speed is 290Rpm, the test load is 200blf to 500blf, and the test time is 60min to 120min.

[0023] Use an electronic balance that can be accurate to 1ug to weigh the weight of the test piece (test pin and V-block) before and after the experiment, and calculate the weight loss of the test piece; if necessary, the friction coefficient 20min to 120min after the start of the experiment can also be exported from the computer.

[0024] The anti-wear performance of the test oil is evaluated by the weight loss of the test pin and V-block before and after the test, that is, (the weight before the test minus the weight after the test); the smaller the weight loss, the better the anti-wear performance of the oil.

[0025] Embodiment 1:

[0026] Four oils of 5W-30SP / GF-6 engine oil A, B, C, and D were selected as reference oils, and the four oils were tested according to the oxidation method of the test sample of the present invention, and the test conditions were: temperature 80°C, air flow rate 10L / h, nitrogen dioxide injection amount 4mL, test time 72h, and the test results are shown in Table 2. Then, the anti-wear performance of the oxidized oil was tested, and the test conditions were: 80°C, 200blf, 290Rpm, 60min.

[0027] The results in Table 1 are the oxidation test results and anti-wear performance test results of the four test oil samples. The oxidation test results reflect the oxidation degree of the oil with oxidation value and nitration value. The larger the value, the greater the oxidation degree; the sum of the weight loss of the test pin and the weight loss of the V-block represents the anti-wear performance of the test oil. The results show that this experiment can well distinguish four oils with different oxidation values ​​and nitration values, as well as weight loss of test pins and V-blocks, that is, anti-wear performance. The results in Table 1 show that the weight loss of the test pins and V-blocks of oil samples A and B is smaller, so they have better anti-wear performance than oil samples C and D.

[0028] Table 1 Reference oil test results

[0029]

[0030] Embodiment 2:

[0031] Four oils of 5W-30SP / GF-6 engine oil A, B, C, and D were selected as reference oils, and the four oils were tested according to the oxidation method of the test sample of the present invention, and the test conditions were: temperature 150°C, air flow rate 15L / h, nitrogen dioxide injection amount 12mL, and test time 160h. Then, the anti-wear performance of the oxidized oil was tested, and the test conditions were: 80°C, 200blf, 290Rpm, 60min.

[0032] The results in Table 2 show that the test pins and V-blocks of oil samples A and B have less weight loss, so they have better anti-wear performance than oil samples C and D.

[0033] Table 2 Reference oil test results

[0034]

[0035] Embodiment 3:

[0036] Four oils of 5W-30SP / GF-6 engine oil A, B, C, and D were selected as reference oils, and the four oils were tested according to the oxidation method of the test sample of the present invention, and the test conditions were: temperature 80°C, air flow rate 15L / h, nitrogen dioxide injection amount 4mL, and test time 72h. Then, the anti-wear performance of the oxidized oil was tested, and the test conditions were: 120°C, 500blf, 290Rpm, and 120min.

[0037] The results in Table 3 show that the test pins and V-blocks of oil samples A and B have less weight loss, so they have better anti-wear performance than oil samples C and D.

[0038] Table 3 Reference oil test results

[0039]

[0040]

[0041] Embodiment 4:

[0042] Four types of engine oil A, B, C and D of 5W-30SP / GF-6 were selected as reference oils. The four types of oils were tested according to the oxidation method of the test samples of the present invention. The test conditions were: temperature 150°C, air flow rate 15L / h, nitrogen dioxide introduction amount 12mL, test time 160h. The tests were carried out respectively, and then the anti-wear performance of the oxidized oils was tested. The test conditions were: 120°C, 500blf, 290Rpm, 60min.

[0043] The results in Table 4 show that the test pins and V-blocks of oil samples A and B have less weight loss, so they have better anti-wear performance than oil samples C and D.

[0044] Table 4 Reference oil test results

[0045]

[0046] Embodiment 5:

[0047] Four kinds of engine oils A, B, C and D of 5W-30SP / GF-6 were selected as reference oils. The four kinds of oils were tested according to the oxidation method of the test samples of the present invention. The test conditions were as follows: temperature 120°C, air flow rate 15L / h, nitrogen dioxide introduction amount 10mL, test time 144h, and the tests were carried out respectively. Then, the anti-wear performance of the oxidized oils was tested. The test conditions were as follows: 100°C, 400blf, 290Rpm, 120min.

[0048] The results in Table 5 show that the test pins and V-blocks of oil samples A and B have less weight loss, so they have better anti-wear performance than oil samples C and D.

[0049] Table 5 Reference oil test results

[0050]

Claims

1. A test method for evaluating the wear resistance of engine oil timing chains, characterized in that: Follow the steps below to implement it: Step 1, respectively mixing the catalysts ferrous acetylacetonate and ferrocene with two or more engine oils to be tested, stirring them evenly, and then introducing the gases into the reactor of the test machine and respectively performing oxidation reactions to obtain oxidized oils; Step 2, inject the oxidized oil into the test oil box of the testing machine, and place the test pin and V-block in the testing machine. After sealing the test oil box, conduct the test, and evaluate the anti-wear performance of the test oil by the weight loss of the test pin and V-block before and after the test; the oil with small weight loss has good anti-wear performance.

2. The test method for evaluating the anti-wear performance of engine oil timing chain according to claim 1, characterized in that: In the step 1, during the oxidation reaction, the stirring rate is 200 rpm, the reaction temperature is 80° C. to 150° C., and the reaction time is 72 h to 160 h.

3. The test method for evaluating the anti-wear performance of engine oil timing chain according to claim 1, characterized in that: In the step 1, the gas is a mixture of air and nitrogen dioxide.

4. The test method for evaluating the anti-wear performance of engine oil timing chain according to claim 3, characterized in that: The air flow rate is 10-15L / h; the nitrogen dioxide flow rate is 0.06mL / h-0.14mL / h.

5. The test method for evaluating the anti-wear performance of engine oil timing chain according to claim 1, characterized in that: In the step 2, the temperature of the test oil box is 80° C. to 120° C., the rotation speed is 290 Rpm, the test load is 200 blf to 500 blf, and the test time is 60 min to 120 min.

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