Thermohydrodynamic Lubrication Model Applicable to a Slipper of Swashplate Type Axial Piston Pumps and Motors (Effects of Operating Conditions)

Kazama, Toshiharu

doi:10.2474/trol.5.250

Cited by 20 publications

(14 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental apparatus and procedures were described in previous papers on the swash plate type axial piston pump Kazama and Sasaki, 2009;, the pressure balance type vane pump (Kazama and Narita, 2011;Kazama, 2013Kazama, , 2014, and the external type gear pump (Kazama et al, 2010). Thus, only a brief description of these is given here.…”

Section: Experimental Apparatus and Test Conditionsmentioning

confidence: 99%

“…These studies focused mainly on the effects of pump discharge pressure, shaft rotational speed, inlet oil temperature, working oil types, and oil viscosity grades on the temperatures of each pump and the oils. In this paper, experiments involving a rotating cylinder block and swash plate axial piston pump (Kazama et al, 2010), a pressure balance vane pump (Kazama, 2013), and an external gear pump are summarized. The results of the temperature measurements are compared, and the differences in terms of the thermal lubrication characteristics of the hydraulic pumps are discussed.…”

Section: Introductionmentioning

confidence: 99%

“…They also numerically analyzed temperature distributions according to thermohydrodynamic lubrication (THL) theory and compared the results with experimental data. Others have also used the THL analysis approach; for example, Kazama (2010) conducted a theoretical study of slippers. He modeled the slippers as a circular hydrostatic thrust bearing, which can revolve and rotate, as well as the inclination of the pad and changes in the physical properties of the liquid.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of temperature measurements and thermal characteristics of hydraulic piston, vane, and gear pumps

Kazama

2015

Mechanical Engineering Journal

Self Cite

View full text Add to dashboard Cite

Hydraulic pumps are positive displacement machines and the primary components of fluid power systems that transform energy from mechanical sources to pressurized oils. The reliability and efficiency of pump components are highly dependent on the tribological characteristics of the sliding parts, which perform bearing and sealing functions. Higher pressurization and increased compactness result in higher contact pressure and oil temperature, which can cause catastrophic damage to the components and severe deterioration of the oils. Three representative hydraulic pumps-including a swash plate axial piston pump, a pressure-balance vane pump, and an external gear pump-were tested under real operating conditions to determine their thermal effects. Discharge pressures up to 21 MPa and rotational speeds up to 50 s 1 were tested. Hydraulic oils with viscosity grades of 22, 32, and 46 were used at 30C50C. The thermocouples were embedded in the cylinder block, swash plate, and valve plate of the piston pump, cam ring and side plate of the vane pump, and the side plate of the gear pump. Platinum resistance thermometers were placed in the conduits close to the suction and discharge ports of the pumps. The temperatures of the sliding parts and working oils were measured simultaneously. Results indicated that for all pump tests, temperatures increased almost monotonically as the discharge pressure increased. The temperatures of the sliding parts were always higher than those of the discharge oils. With the piston pump, the temperatures at the locations corresponding to the discharge port of the swash plate and valve plate were higher. In contrast, with the vane pump, the temperature at the location on the cam ring closest to the suction port was highest.

show abstract

Section: Experimental Apparatus and Test Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of temperature measurements and thermal characteristics of hydraulic piston, vane, and gear pumps

Kazama

2015

Mechanical Engineering Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…The complete THL model (Mitsui et al, 1983) basically comprises the Reynolds, energy, and heat conduction equations, including the changes in physical properties such as viscosity and density as functions of temperature and sometimes pressure (Kazama, 2010). However, if the lubricant temperatures are externally and actively controlled, i.e., when the temperature distributions are given as known values, the energy and heat conduction equations can be omitted from the calculation process.…”

Section: Basic Equationsmentioning

confidence: 99%

Improving the static characteristics of hydrodynamic bearings using the viscosity-temperature relations of lubricants

Kazama

2016

Mechanical Engineering Letters

Self Cite

View full text Add to dashboard Cite

The possibility of improving the static characteristics of hydrodynamic bearings using the inverse viscosity-temperature relations of liquid lubricants is theoretically examined. A simplified model that comprises the Reynolds equation with a change in the mean oil viscosity across the film as a function of temperature and that is based on the thermal lubrication theory is applied. The solutions are numerically obtained for linear sliding bearings, tapered land bearings, and cosine pad bearings, wherein the temperature distributions are given as known values and the viscosity distributions are determined beforehand. The bearing geometry and temperature profiles are selected as parameters. When the temperature in the converged region close to the minimum clearance is low, the fluid pressure becomes larger; thus, the friction coefficient becomes smaller, whereas the leakage flow rate changes slightly. This behavior may contribute to improving the static characteristics of hydrodynamic bearings.

show abstract

“…KOC [3][4] BERGADA [5][6] CFD HARRIS [7][8] MANRING [9][10] KAZAMA [11][12] HASHEMI [13] ( ) [14][15] [16] ( ) ( ) [17][18][19][20] …”

mentioning

confidence: 99%

Thermohydrodynamic Lubrication Analysis of Slipper Pair in Axial Piston Pump Considering Surface Deformation

Tang¹

2017

JME

View full text Add to dashboard Cite

The thermohydrodynamic lubrication properties of overturning slipper pair considering elastic deformation and thermal deformation are studied. The effect of thermal deformation and elastic deformation of slipper surface on the thermoehydrodynamic lubrication of slipper pair under work conditions of different load pressure, shaft speed and inlet temperature is discussed mainly. The lubrication properties of slipper pair is analyzed by using Reynolds equation and film thickness equation based finite difference method. The slipper deformation is calculated by finite element method. The film temperature distribution is calculated by energy equation and heat conduction equation. The results show that there is a convex shape of oil film temperature and pressure distribution in slipper pocket and edge. Oil film temperature cross slipper radius decreases from the slipper pocket to the edge of slipper. The high shaft speed, load pressure and inlet temperature are, the more obvious damped oscillation of oil thickness will be. The fiction torque increases with decreasing oil film thickness. The peaks of fiction torque and oil film thickness exist at the high-pressure and low-pressure alternate region of piston pump.

show abstract

Thermohydrodynamic Lubrication Model Applicable to a Slipper of Swashplate Type Axial Piston Pumps and Motors (Effects of Operating Conditions)

Cited by 20 publications

References 9 publications

Comparison of temperature measurements and thermal characteristics of hydraulic piston, vane, and gear pumps

Comparison of temperature measurements and thermal characteristics of hydraulic piston, vane, and gear pumps

Improving the static characteristics of hydrodynamic bearings using the viscosity-temperature relations of lubricants

Thermohydrodynamic Lubrication Analysis of Slipper Pair in Axial Piston Pump Considering Surface Deformation

Contact Info

Product

Resources

About