Frictional Torque Characteristic of Angular Contact Ball Bearings

Deng, Sier

doi:10.3901/jme.2011.05.114

Cited by 33 publications

(17 citation statements)

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“…Second, probably combined with previous explanation, can be gradual change of the ballrace conformity resulting in increase of the rolling resistance. Conformity of the raceways can directly influence the bearing performance and life -see [16,17] for details. Free particles and lubricant can conglomerate at the edges of the rolling track and change the effective radius of the raceways.…”

Section: Grease Lubricationmentioning

confidence: 99%

Comparison of Grease and Solid Lubrication of Rolling Bearings Under Small-Stroke Reciprocation for Space Applications

David¹,

Šperka²,

Jakub³

et al. 2020

Tribol. Ind.

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Rotary actuator is a device responsible for the precise rotation of sensitive instruments such as antennas. Requirements for its precision and stiffness are extremely high. Actuators used in the space environment have to work for long period, under extreme condition and without possibility of repair or replacement. One of the main components responsible for its proper function are bearings. They precisely support shafts, and usually operate in a very small angular range with many repetitions. Selection of the proper bearing design and also the lubrication of the bearing can have significant effect on the performance and life of the entire satellite. Purpose of this study was to select and test suitable lubricant to support operation of such bearing. Sets of bearings lubricated by Rheolube 2000 and MoS2 PVD film were tested in thermal vacuum chamber under small angle oscillatory motion with the same start and end position for every cycle. Torque and bearing noise was evaluated during the tests and bearings were inspected. Rheolube 2000 was selected as the best lubricant for the described conditions because of the acceptable torque, lower bearing noise and easier manipulation during assembly and testing. However, both options proved to be applicable.

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Section: Grease Lubricationmentioning

confidence: 99%

Comparison of Grease and Solid Lubrication of Rolling Bearings Under Small-Stroke Reciprocation for Space Applications

David¹,

Šperka²,

Jakub³

et al. 2020

Tribol. Ind.

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“…z + i) − self.bound (0, 2 * self. z + i)) * rnd(k) (5) for i in range (0, self.len-2 * self.z): (6) self.X (2 * self.z + i) � self.chrom3(i) # δa, δr #self.X (2 * self.z + 1) � self.chrom3(2 * self.z + 1) #self.X (4 * self.z + 2) � self.chrom(4 * self.z + 2) (7) super().some_necessary_calculations() (8) r � 0 (9) while r < self.z: (10) if self.A1 (r) < 0 or self.A2 (r) < 0: (11) rnd � np.random.random (size � self.len-2 * self.z) # example: if self.len � 5, rnd � (0.29049083 0.96149427 0.75) (12) for i, k in zip (range (0, self.len-2 * self.z), range (0, self.len -2 * self.z)): (13) self.chrom3(i) � self.bound (0, 2 * self.…”

Section: Solution Of Simplified Calculation Modelmentioning

confidence: 99%

“…super().some_necessary_calculations() ( 17) r � 0 self.rand1(i) � rand1(i) (5) for i in range(self.z//2 + 1,self.z): (6) self.rand1(i) � self.rand1(self.z − i) #size � 16 (7) for i, k in zip (range(0,self.z//2 + 1), range(0, self.z//2 + 1)): (8) self.chrom1(i) � self.bound (0, i) + (self.bound (1, i) − self.bound (0, i)) * self.rand1(k) # Xij � Xmin, j + rand (9) for i in range (self.z//2 + 1,self.z): (10) self.chrom1(i) � self.chrom1 (self.z − i) #α o (11) rnd � np.random.random (size � self.z//2 + 1) # example: if self.len � 5, rnd � (0.29049083 0.96149427 0.75) (12) rand2 � sorted (rnd,reverse � True) #size � 8 (13) for i in range(0,self.z//2 + 1): (14) self.rand2(i) � rand 2(i) (15) for i in range (self.z//2 + 1,self.z): (16) self.rand2(i) � self.rand2 (self.z − i) #size � 16 (17) for i, k in zip (range (0, self.z//2 + 1), range (0, self.z//2 + 1)): (18) self.chrom2(i) � self.boun ((0, i + self.z) + (self.bound (1, i + self.z) − self.bound (0, i + self.z)) * self.rand2(k) # Xij � Xmin, j + rand (0, 1) (Xmax,j−Xmin, j) # example: if self.len � 5, rnd � (0.29049083 0.96149427 0.75) (19) 10 Shock and Vibration…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…Subsequently, Harris et al [3] further improved the model, which is referred to as the Jones-Harris (J-H) model. Because the J-H model is effective and accurate for the calculation of internal load distribution, contact angle variation, fatigue life, and stiffness [4][5][6][7][8][9][10][11] of high-speed ball bearings, the model is still widely applied.…”

Section: Introductionmentioning

confidence: 99%

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Study on Simplified Model and Numerical Solution of High-Speed Angular Contact Ball Bearing

Zeng

Zhao

et al. 2020

Shock and Vibration

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For the calculation model of high-speed angular contact bearing has many variables, the large root difference exists, and the Newton iterative method solving the convergence depends on the initial value problems; thus, the simplified calculation model is proposed and the algorithm is improved. Firstly, based on the nonlinear equations of variables recurrence method of the high-speed angular contact ball bearing calculation model, it is proved that the ultimate fundamental variables of calculation model are the actual inner and outer contact angles, the axial and radial deformations. According to this reason, the nonlinear equations are deformed and deduced, and the number of equations is reduced from 4Z + 2 to 2Z + 2 (Z represents the number of rolling bodies); a simplified calculation model is formed. Secondly, according to the small dependence of the artificial bee colony algorithm on the initial value, an improved artificial bee colony algorithm is proposed for the large root difference characteristics of high-speed ball bearings. The validity of the improved algorithm is verified by standard test function. The algorithm is used to solve the high-speed angular contact ball bearing calculation model. Finally, the deformations of high-speed angular contact ball bearings are compared and verified by experiments, and the results of improved algorithm show good agreement with the experiments results.

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“…According to Deng [23] and Wang's [24] research, a smaller radius of curvature of the inner raceway contributes to the formation of a thicker lubricant film, and bearing's friction is small, which contributes to the formation of elastohydrodynamic lubricating film in its interior. Therefore, it is necessary to select a relatively small raceway curvature radius, and curvature radius of the inner raceway should be smaller than the outer.…”

Section: Bearing Designmentioning

confidence: 99%

Structure Design and Performance Analysis of High-Speed Miniature Ball Bearing

Zhang

Chen

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The working performances of miniature ball bearings are obviously affected by its' geometric structure parameters. In this paper, quasi-static analysis theory is applied in the design of miniature ball bearings. Firstly, it is studied the influence of geometry structure, preload and rotating speed on the dynamic performance of bearing. Secondly, bearing dynamic characteristics are analyzed which include the bearing stiffness and Spin to roll Ratio. Lastly, the contact stress and bearing life are calculated. The results indicate that structure parameters play an importance role in bearing's dynamic performances. Miniature ball bearings which have lager ball number, bigger ball diameter and smaller inner race groove radius can get better performances while velocity and preload have great impact on the bearing life. So that parameters of miniature bearing should be chosen cautiously. IntroductionHigh speed miniature bearings are widely used in high speed instruments, which require high precision and long service life. In order to adapt to a variety of working conditions and satisfy interchangeability, the angular contact miniature ball bearings are often chose in these applications. The design of its geometric structure parameters and the selection of axial preload have close relationship with contract load, contract stress, service life and stiffness. The bearing performance can be affected by the subtle change of structure greatly due to its small geometry [1-2].In structure design, machining method, performance analysis and measurement method of miniature bearing, many scholars have done a lot of researches. For calculating the critical speed of rotating machinery supported by miniature bearing, the stiffness of miniature bearings under various loads must be predicted first [3][4][5]. The friction torque is a very important performance of the miniature bearing, and the measurement of the torque is a difficult task in bearing test field Chen [6] has studied the miniature bearing and proposed that the better test data gathered must use more sophisticated test platform. In Gao's [7] paper the factors which cause the friction torque and the measuring methods for the friction torque of the miniature bearing are summarized and analyzed by him. Li [8] established an analysis modal for calculating high speed miniature ball bearing friction torque based on thermal elastohydrodynamic lubrication (TEHL), which has proved by using high precision miniature bearing testing machine. Zhang [9] and his team mainly analysis the design and manufacture of miniature air bearing, and explore the influence of microscale effect and slip flow effect on lubrication characteristics respectively. A new type of grinding process is proposed in Gui's [10] paper, which can effectively improve the wear resistant property of miniature bearing. A new kind of high strength alloy material is introduced by Tomasello [11], which can greatly improve the

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Frictional Torque Characteristic of Angular Contact Ball Bearings

Cited by 33 publications

References 0 publications

Comparison of Grease and Solid Lubrication of Rolling Bearings Under Small-Stroke Reciprocation for Space Applications

Comparison of Grease and Solid Lubrication of Rolling Bearings Under Small-Stroke Reciprocation for Space Applications

Study on Simplified Model and Numerical Solution of High-Speed Angular Contact Ball Bearing

Structure Design and Performance Analysis of High-Speed Miniature Ball Bearing

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