An Experimental Investigation on the Temperature Distribution in Circular Journal Bearings

Mitsui, Jun'ichi; Hori, Yukio

doi:10.1115/1.3261285

Cited by 33 publications

(23 citation statements)

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“…Though the ratio of installed thermocouples on the bearing between the current tests and those of Mitsui, et al (22), (23) was one order of magnitude lower, the number of locations for temperature measurements was higher. Similar to Clayton and Wilkie (20) and Mitsui,et al (22), (23), far from the supply holes, the lightly loaded CGJB's axial gradients were moderate compared to the circumferential ones. Similar to Mitsui,et al (22), (23), the temperature distribution revealed an axisymmetrical profile with respect to the land's mid-plane.…”

Section: Resultsmentioning

confidence: 91%

“…With respect to the extensive measurements performed by Mitsui, et al (22), (23), temperature was measured at the fluidfilm bushing interface across four axial planes instead of three. Though the ratio of installed thermocouples on the bearing between the current tests and those of Mitsui, et al (22), (23) was one order of magnitude lower, the number of locations for temperature measurements was higher.…”

Section: Resultsmentioning

confidence: 99%

“…In the area bounded by the bushing's width, shaft axial temperature distributions were also constant, with a sharp drop measured outside. Mitsui,et al (22), (23) also varied other operating parameters, transforming their work into some of the most complete publications on thermal effects.…”

Section: Introductionmentioning

confidence: 99%

“…One hundred forty-four type-T thermocouples were used by Mitsui, et al (22), (23), for plain journal bearing temperature measurements. The thermocouples were distributed in a 3D pattern within the shaft and bushing.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pressure and Temperature Field Measurements of a Lightly Loaded Circumferential Groove Journal Bearing

Cristea

Bouyer

Fillon

et al. 2011

Tribology Transactions

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pressure and Temperature Field Measurements of a Lightly Loaded Circumferential Groove Journal Bearing

Cristea

Bouyer

Fillon

et al. 2011

Tribology Transactions

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“…On the other hand, for large-scale hydrodynamic bearings, many researchers have tackled the subject theoretically using THL theory [8,9]. Furthermore, experimental studies of journal bearings have been performed by Mitsui et al [ 10], Ferron et al [11], Gethin and Medwell [ 12], and Wang et al [ 13 ]; experimental studies of thrust bearings have been performed by Homer et al [ 14] and Fillon et al [15]. Kazama et al quantitatively examined the thermohydrodynamic performance of circular pad hydrostatic thrust bearings [ 16] including the effect of the changes in physical properties of fluids as functions of temperature and pressure.…”

Section: Introductionmentioning

confidence: 99%

Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

Kazama¹,

Tsuruno²,

Sasaki³

2008

Proceedings of the JFPS International Symposium on Fluid Power

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Temperatures of a swash plate, cylinder block, and a valve plate of swash-plate type axial piston pumps with a rotating cylinder block and a rotating swash plate were measured. Thermocouples were embedded underneath these parts . Hydraulic mineral oils with ISO VG22, 32, 46, and 68 and a water-glycol type hydraulic fluid with VG32 were used as test fluids. The maximum discharge pressure was 20 MPa and the maximum rotational speed was 28.3 rps. The inlet oil temperatures were specified as 293-313 K. At the atmospheric pressure to the maximum discharge pressure , the temperatures, flow rates, and the torque were measured. Results support the following conclusions: i) as the discharge pressure increased, the temperatures of the swash plate, cylinder block, and the valve plate increased in almost direct relation; ii) the cylinder block temperature at the bottom dead center of the pistons increased markedly; iii) the temperature increases using the water-glycol fluid were noticeably smaller than the rises using the mineral oils; and iv) the temperature rises became large for higher fluid viscosity and lower inlet oil temperature.

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Heat Generation and Temperature Rise

Hydrodynamic Lubrication

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Heat generation in the oil film and the accompanying temperature rise are the most important factors in bearings. For example, temperature rise is the factor indicating the operating conditions of a bearing most directly, and if the temperature rise is small, the bearing is probably in a good operating condition. Generally speaking, the problems of heat generation and temperature rise are hard to handle, and so they were not considered in, for example, the early theory of Reynolds. It is thanks to the later development of computers that this kind of problem can now be handled theoretically.Let us first consider the meaning of heat generation and temperature rise in bearings. To begin with, the heat generation essentially corresponds to the loss of mechanical energy due to shear in the lubricant film (solid friction is sometimes also present) of a bearing. Therefore, the less heat generated the better.The effects of temperature rise constitute a bigger problem than the heat generation. The temperature rise decreases the viscosity of the lubricating oil, and thus the minimum film thickness and allows seizure to occur more easily. Further, the temperature rise changes the bearing clearance through the thermal deformation of the bearing metal and casing, thus changing bearing performance.Furthermore, an even bigger problem is that the boundary lubrication performance of the lubricant film will suddenly and almost completely be lost if the oil temperature exceeds a certain critical temperature. A lubricant film has in effect a kind of transition temperature. If the oil temperature is lower than this, the molecules of lubricant combine with a metal surface strongly, and also with the adjacent molecules of lubricant, and form a strong lubricant film on the metal surface. However, if the temperature exceeds the transition temperature, these combinations are lost and the strength of lubricant film will fall markedly. Thus the performance of boundary lubrication of the oil film will be lost and seizure can take place very easily. Therefore, the oil temperature must be kept under the transition temperature, which is unfortunately relatively low (for example 100 • C for low-cost oils and 160 • -170 • C for high-quality oils).In addition, if the oil temperature exceeds 150 • C, the rate of oxidization (or degradation) of the lubricating oil is markedly increased. Also at 100 • C, the tensile

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An Experimental Investigation on the Temperature Distribution in Circular Journal Bearings

Cited by 33 publications

References 0 publications

Pressure and Temperature Field Measurements of a Lightly Loaded Circumferential Groove Journal Bearing

Pressure and Temperature Field Measurements of a Lightly Loaded Circumferential Groove Journal Bearing

Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

Heat Generation and Temperature Rise

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