The Research on Oil-Air Lubrication in Grooved Sliding Bearing

2013 ◽  
Vol 572 ◽  
pp. 384-387
Author(s):  
Jin Li Wang ◽  
Li Quan Li ◽  
Shao Gang Liu
Keyword(s):  
Friction Coefficient ◽  
Temperature Rise ◽  
Testing Machine ◽  
Air Pressure ◽  
Oil Lubrication ◽  
Experimental Conditions ◽  
Sliding Bearing ◽  
Oil Supply ◽  
Air Lubrication ◽  
Bearing Structure

Many Factors affect the oil-air lubrication of sliding bearing such as oil supply, air pressure, load, bearing structure and so on. In order to study the effects of bearing structure on oil-air lubrication in sliding bearing, the oil-air lubrication and oil lubrication experiments of grooved sliding bearing have been done by using friction-abrasion testing machine. By means of measuring the temperature rise and the friction coefficient of grooved sliding bearing on oil-air lubrication and oil lubrication with different level of load at the same rotating speed, the results obtained show that the friction coefficient of oil-air lubrication with oil supply 30ml/h, air pressure 0.25MPa is almost the same as oil lubrication with oil supply 1.4L/h. The oil-air lubrication temperature rise is much lower than the oil lubrication in grooved sliding bearing with the same experimental conditions.

The Research on Oil-Air Lubrication and Oil Lubrication in the Sliding Bearing

2013 ◽  
Vol 572 ◽  
pp. 393-396
Author(s):  
Li Quan Li ◽  
Shao Gang Liu ◽  
Jin Li Wang
Keyword(s):  
Temperature Rise ◽  
Testing Machine ◽  
Oil Lubrication ◽  
Experimental Conditions ◽  
Sliding Bearing ◽  
Rotating Speed ◽  
Oil Supply ◽  
Friction Moment ◽  
Air Lubrication ◽  
Speed Level

In order to study the effect of oil-air lubrication on traditional sliding bearing, the experiments oil-air lubrication and oil lubrication have been done by using friction-abrasion testing machine. By means of measuring friction moment, the temperature rise of two different lubrication systems in the same conditions and studying the friction moment and the temperature rise of oil-air lubrication and oil lubrication with different load at the same rotating speed level, the results obtained show that when rotating speed and oil supply is at 210rpm and 1.4L/h level, the friction moment of traditional sliding bearing with oil lubrication increases significantly after the load 900N, and when rotating speed, oil supply and air pressure is at 210rpm , 30ml/h and 0.25MPa level, the friction moment of traditional sliding bearing with oil-air lubrication increases significantly after the load 1500N. The friction moment of oil-air lubrication and oil lubrication is almost the same before the load 900N, and after the load 900N, the friction moment of oil-air lubrication is much lower than the oil lubrication. The oil-air lubrication temperature rise is much lower than the oil lubrication in traditional sliding bearing with the same experimental conditions.

The Research on Oil-Air Lubrication and Oil Lubrication Used in the Sliding Friction Element

2011 ◽  
Vol 486 ◽  
pp. 283-286 ◽  
Author(s):  
Li Quan Li ◽  
Shao Gang Liu ◽  
Jin Li Wang ◽  
Lin Cai
Keyword(s):  
Friction Coefficient ◽  
Flow Rate ◽  
Temperature Rise ◽  
Sliding Friction ◽  
Testing Machine ◽  
Oil Lubrication ◽  
Rotating Speed ◽  
Friction Element ◽  
Air Lubrication ◽  
Oil Flow

In order to study the effect of oil-air lubrication on sliding friction element, the experiments between oil-air lubrication and oil lubrication have been done by using friction-abrasion testing machine. By means of measuring the temperature rise, the friction coefficient of two different lubrication systems in the same conditions and studying the temperature rise and the friction coefficient of oil-air lubrication with different oil flow rate at the same load and rotating speed level, the results obtained show that when the oil flow rate of oil- air lubrication is equal to 10ml/h, the temperature rise of the element is the same as submerged lubrication caused. As the effect of oil aeration, the friction coefficient of oil-air lubrication is higher. When the load and rotating speed is at 1500N, 210rpm level, as the oil flow rate increases, the temperature rise and friction coefficient of oil-air lubrication element decreases significantly, however, they remain almost unchanged with the increasing of oil supply while the oil flow rate is increased to 15ml/h.

The Research on the Lubricating Property of Oil-Air Lubrication in the Sliding Friction Element

2013 ◽  
Vol 572 ◽  
pp. 397-400
Author(s):  
Shao Gang Liu ◽  
Li Quan Li ◽  
Jin Li Wang
Keyword(s):  
Friction Coefficient ◽  
Sliding Friction ◽  
Testing Machine ◽  
Wear Testing ◽  
Conical Nozzle ◽  
Rotating Speed ◽  
Friction Element ◽  
Oil Supply ◽  
Air Supply ◽  
Air Lubrication

The influence of the oil supply, nozzle type, air supply, the performance of sliding friction element under the lubrication preloads were investigated by measuring the element’s temperature and friction coefficient based on the M2000-A friction wear testing machine. When the load, rotating speed and air supply is at 1500N, 210rpm and 2.25 m3/h level respectively, as the oil supply is increased, the temperature rises and friction coefficient decreases. The temperature rise decreases monotonically. The friction coefficient rises monotonically with the air supply increases when the air supply is less than 2.4m3/h, but when the air supply is more than 2.4m3/h, the friction coefficient decreases monotonically. Furthermore, when the oil supply is reached 15ml/h, they remain almost unchanged regardless of direct nozzle and conical nozzle. Nevertheless, the direct nozzle is more suitable than the conical nozzle in oil-air lubrication of the sliding friction pairs .

An Experimental Study on Oil-Air Lubrication of Sliding Friction Element

2010 ◽  
Vol 34-35 ◽  
pp. 181-185
Author(s):  
Lin Cai ◽  
Jin Li Wang ◽  
Hong Tao Zheng
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Temperature Rise ◽  
Sliding Friction ◽  
Friction Element ◽  
Oil Supply ◽  
Air Supply ◽  
Air Lubrication ◽  
Lubricating Property ◽  
Supply Level

The objective of this research is to study the lubricating property of oil-air lubrication on sliding friction element. The performance of sliding friction element under different lubrication parameters and preloads were investigated by measuring the element’s temperature and friction coefficient. The results show that oil air lubrication could complete the lubrication and cooling of sliding friction element. As the oil supply is increased at the same load, speed and air supply level, the temperature rise and friction coefficient decrease, but when the oil supply is increased to 15ml/h, they remain unchanged. As the air supply is increased at the same load, speed and oil supply level, the temperature rise decreases monotonically and the friction coefficient remains steady.

scholarly journals Tribological Properties of V-Shaped Surface Texture under Oil Lubrication Condition

2019 ◽  
Vol 37 (2) ◽  
pp. 401-406
Author(s):  
Yuanbo Wu ◽  
Xuefeng Yang ◽  
Shouren Wang ◽  
Jian Cheng ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Turbulence Intensity ◽  
Friction And Wear ◽  
Testing Machine ◽  
Wear Testing ◽  
Oil Lubrication ◽  
Oil Film ◽  
Texture Model ◽  
The Stability

In order to study the tribological properties of V-shaped texture under oil lubrication conditions, the loading force and speed are selected as the influencing factors, each factor selected six levels. Experimental study on friction and wear of V-shaped texture with ring arrangement is finished by MMG-10 Multifunctional Friction and Wear Testing Machine, and the data of the experimental results are analyzed by using Matlab. The results show that there is a near linear relationship between the friction coefficient and the loading force and velocity. The relationship between the friction coefficient and the loading force and velocity can be expressed by a functional equation. The loading force has a greater influence on the friction coefficient than the speed. The SEM images of the post-test specimens show that the main weared zone of the V-shaped texture is the tip part. Create a single V-shaped texture model with Solidworks and use CFD to divide the mesh into the Fluent solution. According to the pressure distribution cloud diagram and the turbulence intensity cloud diagram, the stability of the oil film is improved due to the enhanced fluidity of the oil film and the small change in the oil pressure. The tip portion is also the region with a large turbulence intensity value. The improvement of the stability of the oil film is the key to reduce the friction coefficient of the V-shaped texture when the loading force increases.

scholarly journals Formation conditions and mechanical properties of aggregates produced in tephra–water–snow flows

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Hirofumi Niiya ◽  
Kenichi Oda ◽  
Daisuke Tsuji ◽  
Hiroaki Katsuragi
Keyword(s):  
Mechanical Properties ◽  
Mixing Time ◽  
Testing Machine ◽  
Small Scale ◽  
Scaling Analysis ◽  
Compression Tests ◽  
Ice Slurry ◽  
Experimental Conditions ◽  
Formation Conditions ◽  
Snow And Ice

Abstract The formation of aggregates consisting of snow, water, and tephra has been reported in small-scale experiments on three-phase flows containing tephra, water, and snow, representing lahars triggered by snowmelt. Such aggregates reduce the mobility of mud flow. However, the formation mechanism of such aggregates under various conditions has not been investigated. To elucidate the formation conditions and mechanical properties of the aggregates, we performed mixing experiments with materials on a rotating table and compression tests on the resulting aggregates with a universal testing machine in a low-temperature room at $$0\,^{\circ }\text {C}$$ 0 ∘ C . From experiments with varying component ratios of the mixture and tephra diameter, the following results were obtained: (i) the aggregate grew rapidly and reached maturity after a mixing time of 5 min; (ii) the mass of aggregates increased with snow concentration, exhibiting an approximately linear relationship; (iii) single aggregates with large mass formed at lower and higher tephra concentrations, whereas multiple aggregates with smaller mass were observed at intermediate concentrations; (iv) the shape of the aggregate satisfied the similarity law for an ellipsoid; (v) the compressive mechanical behavior could be modeled by an empirical nonlinear model. The obtained mechanical properties of the aggregates were independent of the experimental conditions; (vi) scaling analysis based on the Reynolds number and the strength of the aggregates showed that the aggregates cannot form in ice-slurry lahars. Our findings suggest that low-speed lahars containing snow and ice are likely to generate aggregates, but snow and ice in the ice-slurry lahars are dispersed without such aggregates.

The Dependence of the Friction Coefficient on the Size and Course of Sliding Speed

2014 ◽  
Vol 693 ◽  
pp. 305-310 ◽  
Author(s):  
Eva Labašová
Keyword(s):  
Friction Coefficient ◽  
Normal Load ◽  
Testing Machine ◽  
Current Component ◽  
Sliding Speed ◽  
Rectangular Shape ◽  
Coefficient Increase ◽  
The Coefficient Of Friction ◽  
Ring Method ◽  
Run Up

The coefficient of friction for the bronze material (CuZn25Al6) with insert graphite beds and other bronze material (CuSn12) are investigated in this paper. Friction coefficient was investigated experimentally by the testing machine Tribotestor`89 which uses the principle of the ring on ring method. The external fixed bushing was exposed to the normal load of the same size in all tests. Process of load was increased from level 50 N to 600 N during run up 300 s, after the run up the appropriate level of load was held. The internal bushing performed a rotational movement with constant sliding speed. The value of sliding speed was changed individually for every sample (v = 0.2 (0.3, 0.4) m.s-1). The forth test had a rectangular shape of sliding speed with direct current component 0.3 m.s-1 and the amplitude 0.1 m.s-1 period 300 s, the whole test took 2100 s. The obtained results reveal that friction coefficient increase with the increase of sliding speed.

Effects of Load and Rotate Speed on the Friction of NBR by 45# Steel in Crude Oil Medium

2011 ◽  
Vol 230-232 ◽  
pp. 1079-1083
Author(s):  
Yi Zhang ◽  
Shi Jie Wang ◽  
Zhong Feng Guo ◽  
Zhong Wei Ren
Keyword(s):  
Friction Coefficient ◽  
Crude Oil ◽  
Constant Temperature ◽  
Testing Machine ◽  
Butadiene Rubber ◽  
Nitrile Butadiene Rubber ◽  
Friction Testing ◽  
Low Load ◽  
Test Result

Select two types of nitrile-butadiene rubber (NBR) which they are different in ingredients, under two types of crude oil medium respectively, the test is carried out on the friction testing machine. The test result shows that under the constant intermediate-low rotate speed and constant temperature, the friction coefficient decreases as the load increases; under the constant intermediate-low load and constant temperature, the friction coefficient increases as the rotate speed increases.

scholarly journals Frictional properties of exhumed fault gouges in DFDP-1 cores, Alpine Fault, New Zealand

2021 ◽  
Author(s):  
Carolyn Boulton ◽  
D Moore ◽  
D Lockner ◽  
V Toy ◽  
John Townend ◽  
...  
Keyword(s):  
New Zealand ◽  
Friction Coefficient ◽  
White Mica ◽  
Rate Dependence ◽  
Experimental Conditions ◽  
Alpine Fault ◽  
Negative Rate ◽  
Sample Depth ◽  
Fault Gouges ◽  
Increasing Temperature

Principal slip zone gouges recovered during the Deep Fault Drilling Project (DFDP-1), Alpine Fault, New Zealand, were deformed in triaxial friction experiments at temperatures, T, of up to 350°C, effective normal stresses, σn′, of up to 156 MPa, and velocities between 0.01 and 3 μm/s. Chlorite/white mica-bearing DFDP-1A blue gouge, 90.62 m sample depth, is frictionally strong (friction coefficient, μ, 0.61-0.76) across all experimental conditions tested (T = 70-350°C, σn′ = 31.2-156 MPa); it undergoes a transition from positive to negative rate dependence as T increases past 210°C. The friction coefficient of smectite-bearing DFDP-1B brown gouge, 128.42 m sample depth, increases from 0.49 to 0.74 with increasing temperature and pressure (T = 70-210°C, σn′ = 31.2-93.6 MPa); the positive to negative rate dependence transition occurs as T increases past 140°C. These measurements indicate that, in the absence of elevated pore fluid pressures, DFDP-1 gouges are frictionally strong under conditions representative of the seismogenic crust.

Experimental study on friction coefficient and temperature rise of heavy-load grease-lubricated spherical plain bearings with surface texture

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jinlong Shen ◽  
Tong Zhang ◽  
Jimin Xu ◽  
Xiaojun LIU ◽  
Kun Liu
Keyword(s):  
Friction Coefficient ◽  
Temperature Rise ◽  
Surface Texture ◽  
Tribological Performance ◽  
Textured Surface ◽  
Textured Surfaces ◽  
Roughness Parameters ◽  
Heavy Load ◽  
Friction Coefficients ◽  
Content Type

Purpose This paper aims to improve the tribological performance of grease-lubricated spherical plain bearings (SPBs) under heavy load, dimple-type textures were prepared by laser on the outer surface of the inner ring. The influence of roughness parameters of a textured surface on reducing friction coefficient and temperature rise was also explored. Design/methodology/approach This study adopts a laser processing method to fabricate dimple-type textures. Three-dimensional roughness parameters were used to characterize the textured surfaces. The friction coefficients of five SPBs with surface texture and one original commercially available SPB without surface texture under different nominal loads were measured on a self-established test rig. The data of temperature rise were obtained by nine embedded thermal couples. Findings The results indicate that SPBs with textures generally exhibit lower friction coefficients than the original SPB without textures. The dimple depth has a significant influence on improving the tribological performance, which coincides with the analysis by surface roughness parameters. A textured surface with negative Ssk and high Vvc has the minimum temperature rise. Originality/value As it is too difficult to arrange sensors into heavy-load SPBs, there are few reports about the temperature characteristics. Through nine embedded thermal couples, the distribution of temperature rise on the inner ring of SPBs was given in this study. The positive effect of surface texture on reducing temperature rise and friction coefficient was verified, which is beneficial for the design of heavy-load SPBs.

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