The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Takahisa Kawaguchi - One of the best experts on this subject based on the ideXlab platform.
-
frictional torque of Needle Roller thrust bearings
Tribology Transactions, 2008Co-Authors: Tetsuzo Hatazawa, Takahisa KawaguchiAbstract:In this study, the frictional torque of a Needle Roller thrust bearing was investigated theoretically and experimentally. In order to evaluate the torque, the Roller motion of the bearing was explained regarding the condition that the energy loss generated at the portion where the Roller comes in contact with the raceway becomes minimum. Second, by using the results obtained above, the frictional torque of three types of Needle Roller thrust bearing, single-, double-, and triple-row, were analyzed. Following the theoretical studies, using various types of bearings obtained by changing the number of Rollers, the bearing pitch diameters, the Roller length, the Roller diameter, and the number of rows, experimental investigations were carried out.
-
Influences of bearing pitch diameter, Roller length and Roller diameter on the frictional torque of a Needle Roller thrust bearing
Tribology and Interface Engineering Series, 2007Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa KawaguchiAbstract:In this study, the frictional toque of a Needle Roller thrust bearing was investigated theoretically and experimentally. In order to evaluate the torque, the Roller motion of the bearing was clarified under the condition that the energy loss generated at the contact between the Rollers and raceways become minimum. Secondly, by using these results, the relative sliding between the Rollers, and raceways and the frictional torque of Needle Roller thrust bearing were obtained. Following the theoretical studies, experimental investigations were carried out with a wide range of thrust loads and rotational speeds. Various types of bearings having different numbers of Rollers, different pitch diameters, different Roller length and different Roller diameters were prepared. The results obtained in this work are summarized as follows: o (1) The frictional torque of a Needle Roller thrust bearing is nearly proportional to the thrust load and Roller length. (2) The torque is almost independent of the rotational speed, number of Rollers, bearing pitch diameter and Roller diameter. (3) Experimental results agree with the theory.
-
frictional characteristics of Needle Roller thrust bearings part 2 in the case of multirow bearings and comparison with single row bearings
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa Kawaguchi, Atsuhiko SekiguchiAbstract:In this study, theoretical and experimental investigations were made with the frictional torque of the Needle Roller thrust bearings of the multirow type. At first, the torque of the bearings was obtained using the analytical results of the thrust bearings of a single-row type. Second, experiments were conducted comparing the bearings of the multirow type with the ones of the single-row type in connection with a wide range of the thrust loads at several rotational speeds. The results are summarized as follows. (1) Frictional torque of the bearings of the multirow type in the analysis is decreased in inverse proportion to the number of the rows. (2) Experimental results obtained with the Needle Roller thrust bearings of the multirow type qualitatively agree with the analytical results.
-
frictional characteristics of Needle Roller thrust bearings part 1 in the case of single row type bearing
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Takahisa Kawaguchi, Jujiro KagamiAbstract:In this paper, we discuss with theoretical and experimental investigation concerning frictional torque of Needle Roller thrust bearings. With a view to examining, frictional torque from a theoretical point of view, Roller motion of one of the bearings is explained regarding the condition that energy loss generated at the portion where the Roller comes in contact with the raceways becomes the minimum. Second, by using the results obtained above, we assessed the frictional torque of the thrust bearing of the single-row type. Meanwhile, using various types of bearings obtained by changing Roller diameter, Roller effective length, number of Rollers, and pitch circle diameter, we conducted experimental investigations under a wide range of the thrust loads at several rotational speeds. Results are summarized as follows. (1) The frictional torque of the Needle Roller thrust bearing of the single-row type obtained from the analysis is proportional to the thrust load, coefficient of sliding friction, and effective Roller length. (2) The torque of the bearing is not dependent on the rotational speed, the number of the Rollers, bearing pitch diameter, or Roller diameter. (3) Results obtained from the experiment conducted on the single-row type qualitatively agree with the ones brought about from theoretical analysis.
-
Friction Characteristics of Needle Roller Thrust Bearings
1998Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa KawaguchiAbstract:In this study, friction characteristics of Needle Roller thrust bearings were investigated theoretically and experimentally. In order to evaluate these, Roller motion of the bearing was clarified under the condition that the energy loss generated at the contact between the Rollers and raceways become minimum. Secondly, by using these results, the relative sliding between the Rollers and raceways and the friction torque of Needle Roller thrust bearings were obtained. Following the theoretical studies, experimental investigations were carried out with a wide range of thrust loads and rotational speeds. Various types of bearings having different numbers of Rollers or different pitch diameters were prepared. Friction characteristics obtained in this work are summarized as follows. < (1) Friction torque of Needle Roller thrust bearings is theoretically proportional to the thrust load, coefficient of sliding friction, effective length of the Rollers. < (2) Experimental results nearly agree with the theoretical ones.
Tetsuzo Hatazawa - One of the best experts on this subject based on the ideXlab platform.
-
frictional torque of Needle Roller thrust bearings
Tribology Transactions, 2008Co-Authors: Tetsuzo Hatazawa, Takahisa KawaguchiAbstract:In this study, the frictional torque of a Needle Roller thrust bearing was investigated theoretically and experimentally. In order to evaluate the torque, the Roller motion of the bearing was explained regarding the condition that the energy loss generated at the portion where the Roller comes in contact with the raceway becomes minimum. Second, by using the results obtained above, the frictional torque of three types of Needle Roller thrust bearing, single-, double-, and triple-row, were analyzed. Following the theoretical studies, using various types of bearings obtained by changing the number of Rollers, the bearing pitch diameters, the Roller length, the Roller diameter, and the number of rows, experimental investigations were carried out.
-
Influences of bearing pitch diameter, Roller length and Roller diameter on the frictional torque of a Needle Roller thrust bearing
Tribology and Interface Engineering Series, 2007Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa KawaguchiAbstract:In this study, the frictional toque of a Needle Roller thrust bearing was investigated theoretically and experimentally. In order to evaluate the torque, the Roller motion of the bearing was clarified under the condition that the energy loss generated at the contact between the Rollers and raceways become minimum. Secondly, by using these results, the relative sliding between the Rollers, and raceways and the frictional torque of Needle Roller thrust bearing were obtained. Following the theoretical studies, experimental investigations were carried out with a wide range of thrust loads and rotational speeds. Various types of bearings having different numbers of Rollers, different pitch diameters, different Roller length and different Roller diameters were prepared. The results obtained in this work are summarized as follows: o (1) The frictional torque of a Needle Roller thrust bearing is nearly proportional to the thrust load and Roller length. (2) The torque is almost independent of the rotational speed, number of Rollers, bearing pitch diameter and Roller diameter. (3) Experimental results agree with the theory.
-
frictional characteristics of Needle Roller thrust bearings part 2 in the case of multirow bearings and comparison with single row bearings
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa Kawaguchi, Atsuhiko SekiguchiAbstract:In this study, theoretical and experimental investigations were made with the frictional torque of the Needle Roller thrust bearings of the multirow type. At first, the torque of the bearings was obtained using the analytical results of the thrust bearings of a single-row type. Second, experiments were conducted comparing the bearings of the multirow type with the ones of the single-row type in connection with a wide range of the thrust loads at several rotational speeds. The results are summarized as follows. (1) Frictional torque of the bearings of the multirow type in the analysis is decreased in inverse proportion to the number of the rows. (2) Experimental results obtained with the Needle Roller thrust bearings of the multirow type qualitatively agree with the analytical results.
-
frictional characteristics of Needle Roller thrust bearings part 1 in the case of single row type bearing
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Takahisa Kawaguchi, Jujiro KagamiAbstract:In this paper, we discuss with theoretical and experimental investigation concerning frictional torque of Needle Roller thrust bearings. With a view to examining, frictional torque from a theoretical point of view, Roller motion of one of the bearings is explained regarding the condition that energy loss generated at the portion where the Roller comes in contact with the raceways becomes the minimum. Second, by using the results obtained above, we assessed the frictional torque of the thrust bearing of the single-row type. Meanwhile, using various types of bearings obtained by changing Roller diameter, Roller effective length, number of Rollers, and pitch circle diameter, we conducted experimental investigations under a wide range of the thrust loads at several rotational speeds. Results are summarized as follows. (1) The frictional torque of the Needle Roller thrust bearing of the single-row type obtained from the analysis is proportional to the thrust load, coefficient of sliding friction, and effective Roller length. (2) The torque of the bearing is not dependent on the rotational speed, the number of the Rollers, bearing pitch diameter, or Roller diameter. (3) Results obtained from the experiment conducted on the single-row type qualitatively agree with the ones brought about from theoretical analysis.
-
Friction Characteristics of Needle Roller Thrust Bearings
1998Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa KawaguchiAbstract:In this study, friction characteristics of Needle Roller thrust bearings were investigated theoretically and experimentally. In order to evaluate these, Roller motion of the bearing was clarified under the condition that the energy loss generated at the contact between the Rollers and raceways become minimum. Secondly, by using these results, the relative sliding between the Rollers and raceways and the friction torque of Needle Roller thrust bearings were obtained. Following the theoretical studies, experimental investigations were carried out with a wide range of thrust loads and rotational speeds. Various types of bearings having different numbers of Rollers or different pitch diameters were prepared. Friction characteristics obtained in this work are summarized as follows. < (1) Friction torque of Needle Roller thrust bearings is theoretically proportional to the thrust load, coefficient of sliding friction, effective length of the Rollers. < (2) Experimental results nearly agree with the theoretical ones.
Jujiro Kagami - One of the best experts on this subject based on the ideXlab platform.
-
Influences of bearing pitch diameter, Roller length and Roller diameter on the frictional torque of a Needle Roller thrust bearing
Tribology and Interface Engineering Series, 2007Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa KawaguchiAbstract:In this study, the frictional toque of a Needle Roller thrust bearing was investigated theoretically and experimentally. In order to evaluate the torque, the Roller motion of the bearing was clarified under the condition that the energy loss generated at the contact between the Rollers and raceways become minimum. Secondly, by using these results, the relative sliding between the Rollers, and raceways and the frictional torque of Needle Roller thrust bearing were obtained. Following the theoretical studies, experimental investigations were carried out with a wide range of thrust loads and rotational speeds. Various types of bearings having different numbers of Rollers, different pitch diameters, different Roller length and different Roller diameters were prepared. The results obtained in this work are summarized as follows: o (1) The frictional torque of a Needle Roller thrust bearing is nearly proportional to the thrust load and Roller length. (2) The torque is almost independent of the rotational speed, number of Rollers, bearing pitch diameter and Roller diameter. (3) Experimental results agree with the theory.
-
frictional characteristics of Needle Roller thrust bearings part 2 in the case of multirow bearings and comparison with single row bearings
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa Kawaguchi, Atsuhiko SekiguchiAbstract:In this study, theoretical and experimental investigations were made with the frictional torque of the Needle Roller thrust bearings of the multirow type. At first, the torque of the bearings was obtained using the analytical results of the thrust bearings of a single-row type. Second, experiments were conducted comparing the bearings of the multirow type with the ones of the single-row type in connection with a wide range of the thrust loads at several rotational speeds. The results are summarized as follows. (1) Frictional torque of the bearings of the multirow type in the analysis is decreased in inverse proportion to the number of the rows. (2) Experimental results obtained with the Needle Roller thrust bearings of the multirow type qualitatively agree with the analytical results.
-
frictional characteristics of Needle Roller thrust bearings part 1 in the case of single row type bearing
Japanese journal of tribology, 2003Co-Authors: Tetsuzo Hatazawa, Takahisa Kawaguchi, Jujiro KagamiAbstract:In this paper, we discuss with theoretical and experimental investigation concerning frictional torque of Needle Roller thrust bearings. With a view to examining, frictional torque from a theoretical point of view, Roller motion of one of the bearings is explained regarding the condition that energy loss generated at the portion where the Roller comes in contact with the raceways becomes the minimum. Second, by using the results obtained above, we assessed the frictional torque of the thrust bearing of the single-row type. Meanwhile, using various types of bearings obtained by changing Roller diameter, Roller effective length, number of Rollers, and pitch circle diameter, we conducted experimental investigations under a wide range of the thrust loads at several rotational speeds. Results are summarized as follows. (1) The frictional torque of the Needle Roller thrust bearing of the single-row type obtained from the analysis is proportional to the thrust load, coefficient of sliding friction, and effective Roller length. (2) The torque of the bearing is not dependent on the rotational speed, the number of the Rollers, bearing pitch diameter, or Roller diameter. (3) Results obtained from the experiment conducted on the single-row type qualitatively agree with the ones brought about from theoretical analysis.
-
Friction Characteristics of Needle Roller Thrust Bearings
1998Co-Authors: Tetsuzo Hatazawa, Jujiro Kagami, Takahisa KawaguchiAbstract:In this study, friction characteristics of Needle Roller thrust bearings were investigated theoretically and experimentally. In order to evaluate these, Roller motion of the bearing was clarified under the condition that the energy loss generated at the contact between the Rollers and raceways become minimum. Secondly, by using these results, the relative sliding between the Rollers and raceways and the friction torque of Needle Roller thrust bearings were obtained. Following the theoretical studies, experimental investigations were carried out with a wide range of thrust loads and rotational speeds. Various types of bearings having different numbers of Rollers or different pitch diameters were prepared. Friction characteristics obtained in this work are summarized as follows. < (1) Friction torque of Needle Roller thrust bearings is theoretically proportional to the thrust load, coefficient of sliding friction, effective length of the Rollers. < (2) Experimental results nearly agree with the theoretical ones.
Yang Zheng - One of the best experts on this subject based on the ideXlab platform.
-
Analysis on Contact Strength of Needle Roller Bearing of Transmission and Effect of Surface Modification
Lecture Notes in Electrical Engineering, 2019Co-Authors: Yong Chen, Li Kai, Libin Zang, Yang Zheng, Jia Sen, Huidong Zhou, Boren XueAbstract:Needle Roller bearing is one of the most widely used parts in transmission; however, it often fails due to wear. In order to investigate the mechanism of fatigue damage, the three-dimensional model based on the sixth shift Needle Roller bearing of a six-speed manual transmission was established with Romax Designer. Then, the distribution of the contact stresses on bearing raceways was simulated under different loads. It is found that the stress concentration caused by the deflection of the Needle Rollers will increase the contact stress and lead to the indentations on the raceway surface. The composite surface modification of the Roller raceway was employed, and the loading cycle test was carried out on the transmission test rig. The results show that the composite surface modification technique can improve the fatigue intensity of the contact surface and effectively prevent the indentation. Relevant experimental results provide technical guidance and theoretical basis for the optimization of Needle Roller bearings’ raceway strength.
-
INFLUENCE OF MULLITE ON FRICTION AND WEAR OF Y - TZP CERAMICS
Journal of the Chinese Ceramic Society, 2004Co-Authors: Yang ZhengAbstract:Using a block-on-ring tribometer with revolving motion of high chromium cast iron(HCCI) ring against mullite dispersed yttria stabilized tetragonal zirconia polycrystal (MDZ) blocks, the friction and wear of MDZ were investigated at room temperature in 5% NaOH solution containing 2% (in mass fraction) SiO2 abrasive particles. The results indicate that the wear resistance of 15 MDZ with 15% (in mass) mullite is better than that of 20 MDZ with 20% mullite under the normal load from 100 N to 500 N. The mechanical properties are decreased but the wear resistance is enhanced by dispersing 15% (in mass fraction) mullite in 3Y - TZP( yttria stabilized tetragonal zirconia polycrystal with 3% in mole yttria) (15 MDZ). The main effects of rod-like mullite on the wear resistance are to bear load, restrain the propagation of the preexisted cracks, and reduce the friction and wear due to the action of "Needle Roller bearing" from the fractured rod-like mullite. The main wear mechanism of MDZ ceramics is microploughing and pulling-out of rod-like mullite grain.
Wim Desmet - One of the best experts on this subject based on the ideXlab platform.
-
frictional power loss in solid grease lubricated Needle Roller bearing
Lubrication Science, 2013Co-Authors: Shoaib Iqbal, Jan Croes, Bert Pluymers, Farid Albender, Wim DesmetAbstract:The use of solid grease as a lubricant, in comparison with standard grease or oil, is a pre-requisite when Needle Roller bearings undergo a high-speed oscillating motion and when access to the bearing is difficult for maintenance purposes. This paper examines the frictional power loss of a solid-grease-lubricated Needle Roller bearing. First set of measurement result reveals that the test bearing has higher frictional power loss as compared with other bearings with conventional lubrications, due to the high viscosity of the solid grease. Furthermore, measurements are compared with the Palmgren and SKF models. For improving these models, the parameters of the models are updated on the basis of the measurement data. A second set of measurement result shows that the use of oil (kept at higher temperature) in addition to solid grease significantly reduces the frictional power loss. The reduction is due to the decrease in operational viscosity of the solid grease. Copyright © 2012 John Wiley & Sons, Ltd.
-
Frictional power loss in solid‐grease‐lubricated Needle Roller bearing
Lubrication Science, 2012Co-Authors: Shoaib Iqbal, Farid Al-bender, Jan Croes, Bert Pluymers, Wim DesmetAbstract:The use of solid grease as a lubricant, in comparison with standard grease or oil, is a pre-requisite when Needle Roller bearings undergo a high-speed oscillating motion and when access to the bearing is difficult for maintenance purposes. This paper examines the frictional power loss of a solid-grease-lubricated Needle Roller bearing. First set of measurement result reveals that the test bearing has higher frictional power loss as compared with other bearings with conventional lubrications, due to the high viscosity of the solid grease. Furthermore, measurements are compared with the Palmgren and SKF models. For improving these models, the parameters of the models are updated on the basis of the measurement data. A second set of measurement result shows that the use of oil (kept at higher temperature) in addition to solid grease significantly reduces the frictional power loss. The reduction is due to the decrease in operational viscosity of the solid grease. Copyright © 2012 John Wiley & Sons, Ltd.
