Closure to “Discussion of ‘Analysis of Tapered Roller Bearings Considering High Speed and Combined Loading’” (1977, ASME J. Lubr. Technol., 99, p. 140)

1977 ◽  
Vol 99 (1) ◽  
pp. 140-140
Author(s):  
J. Y. Liu
Keyword(s):  
High Speed ◽  
Combined Loading ◽  
Roller Bearings ◽  
Tapered Roller ◽  
Tapered Roller Bearings

Analysis of Tapered Roller Bearings Considering High Speed and Combined Loading

1976 ◽  
Vol 98 (4) ◽  
pp. 564-572 ◽  
Author(s):  
J. Y. Liu
Keyword(s):  
High Speed ◽  
Analytical Study ◽  
Roller Bearing ◽  
Combined Loading ◽  
Sliding Velocity ◽  
Friction Forces ◽  
Tapered Roller Bearing ◽  
Rolling Contacts ◽  
Tapered Roller ◽  
Tapered Roller Bearings

This paper presents an analytical study of the load distribution in a tapered roller bearing operating at a high speed and under combined loading. The friction forces at the rolling contacts and the cage forces are not considered. A numerical example showing, among other things, the effects of misalignment and speed on the bearing fatigue life and the sliding velocity at the flange contact is given.

scholarly journals Analysis of Dynamic Characteristics of Grease-Lubricated Tapered Roller Bearings

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Zheng-Hai Wu ◽  
Ying-Qiang Xu ◽  
Si-Er Deng
Keyword(s):  
Tilt Angle ◽  
High Speed ◽  
Dynamic Contact ◽  
Plastic Viscosity ◽  
Skew Angle ◽  
Grease Lubrication ◽  
Roller Bearings ◽  
High Speed Trains ◽  
Tapered Roller ◽  
Tapered Roller Bearings

Tapered roller bearings (TRBs) are applied extensively in the field of high-speed trains, machine tools, automobiles, etc. The motion prediction of main components of TRBs under grease lubrication will be beneficial to the design of bearings and the selection of lubricating grease. In this study, considering the dynamic contact relationship among the cage, rollers, and raceways, a multibody contact dynamic model of the TRB was established based on the geometric interaction models and grease lubrication theories. The impacts of load, grease rheological properties, and temperature on the roller tilt and skew and the bearing slip were simulated by using the fourth-order Runge–Kutta method. The results show that the roller tilt angle in the unloaded zone is obviously larger than that in the loaded zone, while the roller skew angle in the unloaded zone is smaller than that in the loaded zone. As the speed increases, the roller tilt and skew and the bearing slip become more serious. Bearing preload can effectively reduce the bearing slip but will make the roller tilt and skew angle increase. The roller skew angle and the bearing slip decrease with the increase of the grease plastic viscosity. The roller tilt angle increases with the increase of the plastic viscosity. The yield stress of the grease has little effect on motions of the roller and cage. The influence of temperature on the roller and cage motions varies with the type of grease used.

scholarly journals Performance of Computer-Optimized Tapered-Roller Bearings to 2.4 Million DN

1981 ◽  
Vol 103 (1) ◽  
pp. 13-20 ◽  
Author(s):  
R. J. Parker ◽  
S. I. Pinel ◽  
H. R. Signer
Keyword(s):  
Heat Generation ◽  
High Speed ◽  
Roller Bearing ◽  
Inlet Temperature ◽  
Tapered Roller Bearing ◽  
Roller Bearings ◽  
Operation Temperature ◽  
Tapered Roller ◽  
High Speed Design ◽  
Tapered Roller Bearings

The performance of 120.65-mm (4.75-in.) bore high-speed design tapered roller bearings was investigated at shaft speeds of 20,000 rpm (2.4 million DN) under combined thrust and radial load. The test bearings design was computer optimized for high-speed operation. Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rates, and lubricant inlet temperature. The high-speed design tapered roller bearing operated successfully at shaft speeds up to 20,000 rpm under heavy thrust and radial loads. Bearing temperatures and heat generation with the high-speed design bearing were significantly less than those of a modified standard bearing tested previously. Cup cooling was effective in decreasing the high cup temperatures to levels equal to the cone temperature.

scholarly journals Lubrication of High-Speed, Large Bore Tapered-Roller Bearings

1978 ◽  
Vol 100 (1) ◽  
pp. 31-38 ◽  
Author(s):  
R. J. Parker ◽  
H. R. Signer
Keyword(s):  
Flow Rate ◽  
Power Loss ◽  
High Speed ◽  
Roller Bearing ◽  
Inlet Temperature ◽  
Shaft Speed ◽  
Roller Bearings ◽  
Lubricant Flow ◽  
Tapered Roller ◽  
Tapered Roller Bearings

The performance of 120.65-mm- (4.75-in.-) bore tapered-roller bearings was investigated at shaft speeds up to 15,000 rpm (1.81 × 106 DN). Temperature distribution and bearing heat generation were determined as a function of shaft speed, radial and thrust loads, lubricant flow rate, and lubricant inlet temperature. Lubricant was supplied either by jets or by a combination of holes through the cone directly to the cone-rib contact and jets at the roller small-end side. Cone-rib lubrication significantly improved high-speed tapered-roller bearing performance, yielding lower cone-face temperatures and lower power loss and allowing lower lubricant flow rates for a given speed condition. Bearing temperatures increased with increased shaft speed and decreased with increased lubricant flow rate. Bearing power loss increased with increased shaft speed and increased lubricant flow rate.

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