Interface lubricating oil transport characteristic test device and test method

Abstract

The invention provides an interface lubricating oil transportation characteristic test device and a test method. The interface lubricating oil transportation characteristic test device comprises a reciprocating motion mechanism, an oil collecting device, a loading mechanism and an oil supply device, the reciprocating motion mechanism is used for converting rotary motion of a motor into reciprocating motion so as to realize relative displacement between friction pairs, the oil collecting devices are distributed on two sides of a friction pair sample and are used for collecting lubricating oil, the loading mechanism is used for loading in a lead screw-spring mode and is used for applying pressure to the friction pairs, and the oil supply mechanism is used for supplying the lubricating oil regularly and quantitatively. The testing method comprises a transportation distance test and a transportation volume test, the former is used for measuring the transportation distance by observing oil film distribution through small-amount oil supply, and the latter is used for continuously supplying oil, weighing and calculating the transportation volume. The device is stable in operation and accurate in data acquisition, fills the blank of quantitative test in the field of interface lubricating oil transportation, realizes characterization of the transportation characteristics of the interface lubricating oil of the reciprocating friction pair, and provides an effective means for accurately evaluating the characteristics.

Description

Technical Field

[0001] The present invention relates to the field of interface lubricating oil transportation, and in particular to an interface lubricating oil transportation characteristic test device and a test method. Background Art

[0002] Reciprocating friction pairs, such as piston-cylinder liner, piston rod-stuffing box and crosshead slider-guide rail, are key components of diesel engines. Their performance will directly affect the working performance and service life of diesel engines. Reciprocating friction pairs should meet the requirements of high guiding accuracy, good high-speed motion stability, high rigidity, and good lubrication. Among them, the lubrication of the friction pair is mainly related to the supply of lubricating oil between the interfaces. Whether the lubricating oil can be supplied to the oil-deficient area will affect the lubrication condition of the friction pair.

[0003] The friction pair surface with asymmetric texture produces different fluid dynamic pressure effects in the two opposite reciprocating motions. The resulting dynamic pressure difference leads to different lubricant oil transport effects to the two ends of the friction pair, so that the limited lubricant oil can be transported more to the oil-deficient area, realizing the lubricant oil transport between the friction pair interfaces. At present, the test methods for interfacial lubrication characteristics are mainly based on the measurement of bearing capacity, friction force and oil film thickness, and lack quantitative testing of interfacial lubricant oil transport characteristics. Therefore, how to accurately evaluate the interfacial lubricant oil transport characteristics is an urgent problem to be solved by technicians in this field. Summary of the invention

[0004] According to the technical problems raised above, a test device and method for interface lubricant transport characteristics are provided. Based on the anisotropic effect of reciprocating asymmetric texture interface friction pair, the present invention realizes the evaluation of interface lubricant transport characteristics by measuring the transport characteristic quantities of transport distance and transport volume.

[0005] To achieve the above-mentioned purpose, the present invention provides an interface lubricating oil transport characteristics test device, comprising: a reciprocating mechanism, an oil collecting device, a loading mechanism, and an oil supply device;

[0006] The reciprocating motion mechanism is used to convert the rotational motion of the motor into reciprocating motion to achieve relative displacement between the friction pairs;

[0007] The oil collecting devices are distributed on both sides of the friction pair specimen and are used to collect lubricating oil;

[0008] The loading mechanism adopts a screw-spring method for loading and is used to apply pressure to the friction pair;

[0009] The oil supply mechanism is used for supplying lubricating oil in a timely and quantitative manner.

[0010] Furthermore, the reciprocating motion mechanism includes a servo motor, an eccentric coupling, a connecting rod, and a lower sample base. The servo motor drives the eccentric coupling to rotate, and the eccentric coupling drives the connecting rod and the lower sample base, so that the lower sample of the friction pair reciprocates on the guide rail, and the speed range is 0-1600r / min.

[0011] Furthermore, the loading mechanism includes a loading rod, a loading force sensor, an upper bearing plate, a lower bearing plate, and an upper sample fixture; when the loading mechanism is loaded, the loading rod is rotated clockwise, and the downward loading force is transmitted to the upper bearing plate, the loading force sensor, the lower bearing plate, the upper sample fixture and the sample on the friction pair in sequence.

[0012] Furthermore, the oil collecting device has the characteristics of being independently detachable, reusable and easy to clean, and the oil collecting device is fixed on the reciprocating mechanism fixture.

[0013] Furthermore, the oil supply mechanism includes a syringe and an oil supply pipeline, and can supply lubricating oil in a timely and quantitative manner through a peristaltic pump or a micro-injection pump.

[0014] The present invention also provides a method for testing the transport characteristics of interface lubricating oil, including a transport distance test and a transport volume test.

[0015] Furthermore, the transport distance test is performed: the upper sample of the friction pair is clamped by a fixture, the lower sample of the friction pair and the oil collecting device are installed on the reciprocating mechanism and fixed with bolts, pressure is applied downward through the loading mechanism, the reciprocating mechanism drives the lower sample of the friction pair to move, a small amount of lubricating oil is injected into one side of the upper sample of the friction pair, and the farthest distance of the oil film distribution is measured and recorded as the transport distance data.

[0016] Furthermore, the transport volume test: the upper sample of the friction pair is clamped by a fixture, the lower sample of the friction pair and the oil collecting device are installed on the reciprocating mechanism and fixed with bolts, pressure is applied downward by the loading mechanism, the reciprocating mechanism drives the lower sample of the friction pair to move, the oil supply time and oil supply rate are set by the oil supply device, the lubricating oil is injected into one side of the upper sample of the friction pair, the oil box on the transport side is weighed before and after the test, and the transport volume data is calculated by the difference in the mass of the oil box.

[0017] Due to the adoption of the above technical solution, compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention provides an interface lubricant oil transport characteristics test device and test method. Aiming at the lack of test devices for interface lubricant oil transport characteristics, an interface lubricant oil transport characteristics test device is completed. The device operates stably and the test data is collected accurately.

[0019] 2. The present invention provides an interface lubricant oil transport characteristics test device and test method. According to the flow characteristics of the lubricant oil in reciprocating motion, an interface lubricant oil transport test method with two transport characteristic quantities, transport distance and transport volume, is designed to realize the characterization of the interface lubricant oil transport characteristics of the reciprocating motion friction pair.

[0020] 3. The present invention provides an interface lubricating oil transport characteristics test device and test method, which adopts a combined design of a reciprocating motion mechanism, an oil collecting device, a loading mechanism and an oil supply mechanism. The structure is stable and the operation is reliable. The reciprocating motion speed is controlled by a servo motor, the screw-spring mechanism realizes precise loading, and the peristaltic pump or micro-injection pump supplies oil in a timely and quantitative manner, thereby ensuring the accuracy and repeatability of the test data.

[0021] Based on the above reasons, the present invention can be widely promoted in the field of interface lubricating oil transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a three-dimensional structural schematic diagram of an interface lubricating oil transport characteristics test device according to the present invention;

[0024] Figure 2 It is a partial structural enlarged diagram of an interface lubricating oil transport characteristic test device described in the present invention;

[0025] Figure 3 It is a schematic diagram of a flow chart of a method for testing the transport distance of an interface lubricating oil transport characteristic according to the present invention;

[0026] Figure 4 It is a schematic diagram of a flow chart of a method for testing the transport characteristics and transport volume of an interface lubricating oil according to the present invention;

[0027] Figure 5 It is a transport distance data diagram of an interface lubricating oil transport characteristic test device and test method described in the present invention;

[0028] Figure 6 It is a transport volume data diagram of an interface lubricant transport characteristic test device and test method described in the present invention.

[0029] In the figure: 1. servo motor; 2. motor bracket; 3. lower plate; 4. eccentric coupling; 5. connecting rod; 6. left oil box; 7. guide rail; 8. slider; 9. upper sample of friction pair; 10. lower sample of friction pair; 11. upper sample fixture; 12. lower sample base; 13. lower sample cover; 14. right oil box; 15. micro injection pump; 16. syringe; 17. fixing pin; 18. connecting rod; 19. friction force sensor; 20. lower bearing plate; 21. loading force sensor; 22. upper bearing plate; 23. loading rod; 24. vertical plate; 25. loading force digital display push-pull dynamometer; 26. friction force digital display push-pull dynamometer; 27. oil box base. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0036] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0037] Example 1

[0038] like Figures 1 to 2 As shown, the interface lubricating oil transport characteristic test device of the present invention comprises: a reciprocating mechanism, an oil collecting device, a loading mechanism, and an oil supply device;

[0039] The reciprocating motion mechanism is used to convert the rotational motion of the motor into reciprocating motion to achieve relative displacement between the friction pairs;

[0040] The oil collecting devices are distributed on both sides of the friction pair specimen and are used to collect lubricating oil;

[0041] The loading mechanism adopts a screw-spring method for loading and is used to apply pressure to the friction pair;

[0042] The oil supply mechanism is used for supplying lubricating oil in a timely and quantitative manner.

[0043] The reciprocating motion mechanism includes a servo motor 1, an eccentric coupling 4, a connecting rod 5, and a lower sample base 12. The servo motor 1 is installed on the motor bracket 2, driving the eccentric coupling 4 to rotate. The eccentric coupling 4 drives the connecting rod 5 and the slider 8 of the lower sample base 12 to move on the guide rail 7, so that the lower sample 10 of the friction pair reciprocates on the guide rail 7, and the speed range is 0-1600r / min.

[0044] The loading mechanism includes a loading rod 23, a loading force sensor 21, an upper bearing plate 22, a lower bearing plate 20, an upper sample fixture 11, a fixing pin 17, a connecting rod 18, and a friction force sensor 19; when the loading mechanism is loaded, the loading rod 23 is rotated clockwise, and the downward loading force is transmitted to the upper bearing plate 22, the loading force sensor 21, the lower bearing plate 20, the upper sample fixture 11 and the friction pair upper sample 9 in sequence, and the loading force digital display push-pull force gauge 25 displays the value; the friction pair upper sample 9 is fixed to the connecting rod 18 by the fixing pin 17, connected to the friction force sensor 19, and the friction force digital display push-pull force gauge 26 displays the value.

[0045] The oil collecting device has the characteristics of being independently disassembled, reusable and easy to clean. The oil collecting device is fixed on the reciprocating motion mechanism fixture and also includes a left oil box 6 and a right oil box 14.

[0046] The oil supply mechanism includes a syringe 16 and an oil supply pipeline, and can supply lubricating oil in a regular and quantitative manner through a peristaltic pump or a micro-injection pump 15 .

[0047] The interface lubricating oil transport characteristic test device is provided with a lower plate 3 at the bottom and a vertical plate 24 at the side.

[0048] Example 2

[0049] like Figure 3As shown, this embodiment is a lubricating oil transport distance test. In this experiment, the upper friction pair sample 9 uses four cylindrical aluminum alloy samples with a surface size of 20mm×12mm, and the material is 6061 aluminum alloy. The lower friction pair sample 10 is 40 steel.

[0050] Polish with 600-mesh, 1000-mesh, and 1500-mesh sandpaper in sequence, use a metallographic polishing machine combined with 1 μm diamond polishing agent to polish until the surface is reflective, and perform ultrasonic cleaning with anhydrous ethanol for a total of 10 minutes.

[0051] Asymmetric textures were machined on the surfaces of three of the upper samples. The marking parameters were set as follows: maximum power of 20 W, speed of 200 mm / s, frequency of 20 kHz, texture widths of 0.4 mm, 0.6 mm, and 0.8 mm, respectively. The texture surface density was 30%, and the processing depth was 0.1 mm.

[0052] The prepared asymmetric textured friction pair upper sample 9 is obtained, and the impurities on the sample surface are cleaned again by using an ultrasonic cleaner for 10 minutes. After cleaning, the sample is bagged together with the non-textured friction pair upper sample 9 for later use.

[0053] Before the experiment begins, check whether the wiring of the servo motor 1, microinjection pump 15, etc. is correctly connected. After checking, turn on the power to preheat the test machine.

[0054] Take out the non-textured friction pair sample, fix the non-textured friction pair upper sample 9 to the relevant position of the test machine through the clamp of the loading mechanism and install a sealing gasket to prevent damage to the clamp and play a sealing role. Then, fix the oil box base 27, the left oil box 6, the right oil box 14, and the friction pair lower sample 10 to the lower sample base 12 through the lower sample cover 13.

[0055] Use the servo control software to modify the parameters of servo motor 1 and adjust the speed of servo motor 1 to 100r / min.

[0056] Use the syringe 16 to inject, supply 0.5 ml of oil on one side of the upper sample; start the servo motor 1, set the number of reciprocating motions to 20 times, and conduct the experiment.

[0057] After the experiment is finished, the servo motor 1 is stopped first, and then the loading rod 23 is adjusted to unload. Finally, the power is turned off and the sample is cleaned.

[0058] The transport distance of the lubricating oil on the lower sample 10 of the friction pair is measured, and after the measurement, the lower sample 10 of the friction pair is wiped clean with anhydrous ethanol and oil-absorbing paper.

[0059] The sample 9 on the friction pair without texture was replaced by the sample 9 on the friction pair with asymmetric texture, and the above operation was repeated to complete the transport distance experiment of all the above samples. Each group was repeated three times and the average value was taken.

[0060] Organize experimental data and analyze experimental conclusions; Figure 5 Figure 2 is the transport distance diagram of friction pair samples with three texture widths and without texture. It can be seen that the transport distance of the asymmetric texture friction pair is longer than that of the non-textured friction pair, and with the increase of texture width, the transport distance shows a trend of first increasing and then decreasing. This is because as the texture width increases, the amount of lubricating oil flowing into the texture increases, but at the same time, the aspect ratio increases and the anisotropic effect weakens. Therefore, when the texture depth is the same, there is a friction pair with a better texture width, which makes the lubricating oil transport distance reach the farthest.

[0061] Example 3

[0062] like Figure 4 As shown, this embodiment is a lubricating oil transport distance test. In this experiment, the upper friction pair sample 9 uses four cylindrical aluminum alloy samples with a surface size of 20mm×12mm, and the material is 6061 aluminum alloy. The lower friction pair sample 10 is 40 steel.

[0063] Polish with 600-mesh, 1000-mesh, and 1500-mesh sandpaper in sequence, use a metallographic polishing machine combined with 1 μm diamond polishing agent to polish until the surface is reflective, and perform ultrasonic cleaning with anhydrous ethanol for a total of 10 minutes.

[0064] Asymmetric textures were machined on the surfaces of three of the upper samples, and the marking parameters were set to a maximum power of 20 W, a speed of 200 mm / s, a frequency of 20 KHz, and a machining depth of 0.1 mm.

[0065] The prepared asymmetric textured friction pair upper sample 9 is obtained, and the impurities on the sample surface are cleaned again by using an ultrasonic cleaner for 10 minutes. After cleaning, the sample is bagged together with the non-textured friction pair upper sample 9 for later use.

[0066] Before the experiment begins, check whether the wiring of the servo motor 1, microinjection pump 15, etc. is correctly connected. After checking, turn on the power to preheat the test machine.

[0067] Weigh the clean left oil box 6 and record it as M 1 .

[0068] Take out the non-textured friction pair sample, fix the non-textured friction pair upper sample 9 to the relevant position of the test machine through the clamp of the loading mechanism and install a sealing gasket to prevent damage to the clamp and play a sealing role. Then, fix the oil box base 27, the left oil box 6, the right oil box 14, and the friction pair lower sample 10 to the lower sample base 12 through the lower sample cover 13.

[0069] Use the servo control software to modify the parameters of servo motor 1 and adjust the speed of servo motor 1 to 200r / min.

[0070] The microinjection pump 15 is started to supply oil, the oil supply volume is 10 ml, and the oil supply time is 10 minutes; and the servo motor 1 is started at the same time, and the motor is set to run for 10 minutes.

[0071] After the experiment is finished, the servo motor 1 is stopped first, and then the loading rod 23 is adjusted to unload. Finally, the power is turned off and the sample is cleaned.

[0072] Weigh the left oil box 6 filled with lubricating oil and record it as M 2 , pour the oil into a waste oil barrel after weighing, and clean the oil box with anhydrous ethanol; the right oil box 14 is a recycling oil box and is not weighed. Similarly, pour the oil into a waste oil barrel, clean the oil box with anhydrous ethanol, and wipe the lower sample 10 of the friction pair clean with oil-absorbing paper.

[0073] Calculate M 2 -M 1 =M 0 , M 0 The non-textured friction pair sample 9 was replaced by the asymmetric friction pair sample 9, and the above operation was repeated to complete the transport test of all the samples. Each group was repeated three times to take the average value.

[0074] Organize experimental data and analyze experimental conclusions; Figure 6 The transport capacity diagram of friction pair samples with three texture widths and no texture. It can be seen that the transport capacity of asymmetric texture friction pairs is higher than that of no texture friction pairs, and with the increase of texture width, the transport capacity shows a trend of first increasing and then decreasing. This is because as the texture width increases, the amount of lubricating oil flowing into the texture increases, but at the same time, the aspect ratio increases and the anisotropic effect weakens. Therefore, under the same texture condition, there is a friction pair with a better texture width, which can maximize the lubricating oil transport capacity.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An interface lubricant transport characteristics test device, characterized in that: include: Reciprocating mechanism, oil collecting device, loading mechanism, oil supply device; The reciprocating motion mechanism is used to convert the rotational motion of the motor into reciprocating motion to achieve relative displacement between the friction pairs; The oil collecting devices are distributed on both sides of the friction pair specimen and are used to collect lubricating oil; The loading mechanism adopts a screw-spring method for loading and is used to apply pressure to the friction pair; The oil supply mechanism is used for supplying lubricating oil in a timely and quantitative manner.

2. The interface lubricant transport characteristics test device according to claim 1, characterized in that: The reciprocating mechanism includes a servo motor, an eccentric coupling, a connecting rod, and a lower sample base. The servo motor drives the eccentric coupling to rotate, and the eccentric coupling drives the connecting rod and the lower sample base, so that the lower sample of the friction pair reciprocates on the guide rail, and the speed range is 0-1600r / min.

3. The interface lubricant transport characteristics test device according to claim 1, characterized in that: The loading mechanism comprises a loading rod, a loading force sensor, an upper bearing plate, a lower bearing plate, and an upper sample fixture; when the loading mechanism is loading, the loading rod is rotated clockwise, and the downward loading force is transmitted to the upper bearing plate, the loading force sensor, the lower bearing plate, the upper sample fixture, and the sample on the friction pair in sequence.

4. The interface lubricant transport characteristics test device according to claim 1, characterized in that: The oil collecting device has the characteristics of being independently detachable, reusable and easy to clean, and the oil collecting device is fixed on the reciprocating motion mechanism fixture.

5. The interface lubricant transport characteristics test device according to claim 1, characterized in that: The oil supply mechanism comprises a syringe and an oil supply pipeline, and can supply lubricating oil in a timely and quantitative manner through a peristaltic pump or a micro-injection pump.

6. A method for testing the transport characteristics of interface lubricating oil, characterized in that: Includes transport distance test and transport volume test.

7. A method for testing the transport characteristics of interface lubricating oil according to claim 6, characterized in that: The transport distance test is as follows: the upper sample of the friction pair is clamped by a fixture, the lower sample of the friction pair and the oil collecting device are installed on the reciprocating mechanism and fixed with bolts, pressure is applied downward by the loading mechanism, the reciprocating mechanism drives the lower sample of the friction pair to move, a small amount of lubricating oil is injected into one side of the upper sample of the friction pair, and the farthest distance of the oil film distribution is measured and recorded as the transport distance data.

8. A method for testing the transport characteristics of interface lubricating oil according to claim 6, characterized in that: The transport volume test is as follows: the upper sample of the friction pair is clamped by a fixture, the lower sample of the friction pair and the oil collecting device are installed on the reciprocating mechanism and fixed with bolts, downward pressure is applied by the loading mechanism, the reciprocating mechanism drives the lower sample of the friction pair to move, the oil supply time and the oil supply rate are set by the oil supply device, the lubricating oil is injected into one side of the upper sample of the friction pair, the oil box on the transport side is weighed before and after the test, and the transport volume data is calculated by the difference in the mass of the oil box.

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