Needle Bearing Axial Thrust Study

Ulezelski, James C.; Evans, D. Gareth; Haka, Raymond J.; Malloy, John

doi:10.4271/830568

Cited by 10 publications

(3 citation statements)

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“…Many studies have been carried out on influence factors of the operational characteristics and service lives of NRBs or roller bearings. Ufezelsk et al [1] analytically and experimentally investigated the axial forces generated by needle skew in full complement, continuous rotation needle bearings. Iqbal et al [2] studied the frictional power loss of a solid-grease-lubricated NRB.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of a Needle Roller Bearing in a Megawatt Reciprocating Pump

Li,

Wei,

et al. 2023

J Fail. Anal. and Preven.

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In this paper, bearing failure was reported for a needle roller bearing used as intermediate support in a pinion shaft system. Severe deformation and wear were noticed on the working surface of the failed needle roller and around the window lintel of the bearing cage. The geometry, materials and hardness of the failed needle roller bearing were analyzed. Appearance detection, SEM and EDS analyses were carried out for clarifying the potential reasons of the needle roller bearing failure. The effect of radial displacement, Hertz contact stress and misalignment on the service life of the needle roller bearing were discussed. The excessive deformation and misalignment, resulting from the unbalanced loading and improper assembly, are the likely cause of the needle roller bearing failure.

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Section: Introductionmentioning

confidence: 99%

Failure Analysis of a Needle Roller Bearing in a Megawatt Reciprocating Pump

Li,

Wei,

et al. 2023

J Fail. Anal. and Preven.

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show abstract

“…The friction between the end faces is reduced to extend the service life of the transmission. The foreign research of non-contact axial support earlier research literature on [4][5] bevel gear planetary disc row axial supporting by theory and experiment, proved that the radial slot can bear axial hydrodynamic pressure generated between the load, improve the axial bearing capacity of fluid between the Ref. [6] studied different groove parameters and end the influence of bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

A Study on Axial Bearings Lubrication Characteristics in High-speed Planetary Transmissions of Vehicles

Wang¹,

Huang²,

Yuan³

2017

Proceedings of the 2017 International Conference on Manufacturing Engineering and Intelligent Materials (ICMEIM 2017)

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Abstract.To reduce the wear of thrust washer within straight planetary gear set, hydrodynamic lubrication design was studied by way of machining grooves in the radial direction into sides of thrust washer. Such grooves can result in a hydrodynamic pressure to separate the contact surfaces and reduce the wear accordingly. Based on mass boundary conditions, the Reynolds equation was discretized using control volume method. The results show that, to increase the axial clearance and groove depth, to decrease groove width ratio and groove number can decrease the friction between planetary gear transverse and axial bearing surface. The fluid flow increased when groove depth and groove numbers increased. The bearings have the maximum load capacity when the groove number is 24 and the groove width ratio is 0.5. In engineering applications, make sure the groove depth is 10~40μm, and recommend assembling clearance between planet wheel and thrust washer is 5μm.

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“…Radial grooves can generate fluid dynamic pressure between two relatively rotating surfaces, which can offer sufficiently axial load force, according to the theoretical and experimental study of the helical geared thrust bearings in Ref. [2,3]. Yu and Sadeghi [4] analyzed the influence of thrust washer hydrodynamic pressure on lubrication characteristic.…”

Section: Introductionmentioning

confidence: 99%

Study on Lubrication Characteristics of Trapezoidal Groove for Planetary Gear Sliding Bearing

Wang¹,

Huang²,

Sun³

2017

Proceedings of the 2017 International Conference on Manufacturing Engineering and Intelligent Materials (ICMEIM 2017)

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Abstract. It has been proven to be an effective method for reducing the friction and wear of two contact surfaces by introducing a hydrodynamic lubrication mechanism. A linear trapezoidal groove was proposed to accommodate the bidirectional rotation of the planetary gear. Cavitation and fluid rotation centrifugal forces were analyzed by the finite control volume method. The influence of the structural parameters of the groove, such as profile inclination of trapezoidal groove, film thickness ratio, groove number and groove width ratio, on the hydrodynamic lubrication characteristics of the groove were investigated. The results show that an optimal interval value is existent for trapezoidal profile inclination, film thickness ratio and groove number, and simultaneously meeting the maximum bearing capacity and minimum friction coefficient for the fluid lubrication. The cross-sectional area of the groove and rotating centrifugal force have a great influence on the flow rate and cavitation rate of the oil film. When other parameters are unchanged, the trapezoidal profile inclination is better than that of the rectangular groove and the triangle groove in a certain range. The cavitation rate was commonly determined with the oil flow and centrifugal force, but the bearing capacity could be hardly influenced.

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Needle Bearing Axial Thrust Study

Cited by 10 publications

References 0 publications

Failure Analysis of a Needle Roller Bearing in a Megawatt Reciprocating Pump

Failure Analysis of a Needle Roller Bearing in a Megawatt Reciprocating Pump

A Study on Axial Bearings Lubrication Characteristics in High-speed Planetary Transmissions of Vehicles

Study on Lubrication Characteristics of Trapezoidal Groove for Planetary Gear Sliding Bearing

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