... for the engagement dynamics of a wet clutch. The numerical and experimental analyses demonstrate the importance of thermal effects when evaluating the dynamics of squeeze-film flow between two rotating disks. Heat transfer affects the viscous and mixed lubrication phases of the engagement process significantly...

...Yijun Qiao; Yun-Bo Yi; Tie Wang; Hongwei Cui; Zisheng Lian Wear is an inevitable phenomenon in the working process of clutch and brake system. With the increase of transmission speed and power density, the thermoelastic instability (TEI) of clutch and brake system is becoming more serious over time...

...Manish Kumar Thakur; Chiranjit Sarkar In this research article, the working of conventional clutch (CC) filled with magnetorheological (MR) fluid was tested at low compressive load. The flexible permanent magnetic sheet (FMS) controlled the chain strength of MR fluid. A single clutch plate based...

... effective thermal and tribological performance. A test rig is developed with a DC motor, torque sensor, and MR clutch operated in a shear mode to test the torque transmission. Results show the lubrication effects of graphite flakes in the MR fluid. Torque transmission is improved in on-state and off-state...

...Bangzhi Wu; Datong Qin; Jianjun Hu; Yonggang Liu In this study, an experiment is conducted for assessing the friction characteristics of a wet clutch on actual working conditions, to determine how various factors influence the friction coefficient in the actual working process of a wet clutch...

... Contributed by the Tribology Division of ASME for publication in the J ournal of T ribology . 21 11 2020 25 01 2021 25 01 2021 23 02 2021 hydro-viscous drive wet friction pairs load-bearing capacity mixed friction clutches contact Hydro-viscous drive (HVD) refers...

...Manish Kumar Thakur; Chiranjit Sarkar In this research paper, an attempt has been made to investigate the torque transmission characteristics in a radial magnetorheological (MR) clutch disc with different groove profiles. To estimate the transmitted torque, a numerical procedure is initiated...

...Mengyu Zhu; Xintian Liu; Fuchao Kan; Ziyun You To predict the life of the clutch friction plate, friction characteristics of the friction plate and the steel sheet assembly are analyzed in the full life cycle. A contact model of the friction surface is built based on the micro-convex body model...

...Er-hui Zhao; Biao Ma; He-yan Li This work is devoted to investigate the effects of thermal buckling on the tribological characteristics of a Cu-based wet clutch by artificially modifying friction pairs into different contact ratios. A thermal lubrication model is provided, and corresponding...

... at the interface y = 0 with coefficient f , leading to the generation of frictional heat [ 17 ] Fig. 2 The load conditions during the engagement cycle of the clutch Fig. 1 The main parts of multidisk clutch. ( a ) Multidisk clutch system [ 16 ] and ( b ) axisymmetric model...

... in unidirectional sliding contact over a range of speeds, loads, and temperatures. Tests were performed on a steel-versus-clutch friction material tribocouple, mainly to establish the link between the lubricant/surface interactions and additive system performance. A new parameter that measures the positive μ -v...

...J. Y. Jang; M. M. Khonsari; Rikard Maki A model is developed to investigate the effect of radial grooves and waffle-shape grooves on the performance of a wet clutch. Three-dimensional formulation of the governing equations, boundary conditions, and numerical solution scheme are presented...

...Chinar R. Aphale; William W. Schultz; Steven L. Ceccio In a disengaged or open clutch mode, one plate rotates while the other is stationary. This speed difference between the two plates (on the order of 1000 rpm) and the small clearance between them (on the order of 100 μ m ) results in large...

...Chinar R. Aphale; Jinhyun Cho; William W. Schultz; Steven L. Ceccio; Takao Yoshioka; Henry Hiraki The relative motion of the friction and separator plates in wet clutches during the disengaged mode causes viscous shear stresses in the fluid passing through the 100 microns gap. This results...

...C. Krempaszky; H. Lippmann Based on Kirchhoff’s plate theory a model is developed to estimate the onset of thermoelastic instabilities (TEI) in axisymmetric sliding systems consisting of plate components such as automotive disk breaks or clutches. The thermoelastic feedback due to a symmetric, two...

...J. Y. Jang; M. M. Khonsari Thermoelastic instability (TEI) is known to be directly related to the occurrence of hot spots in friction systems, such as brakes, seals, and clutches. TEI is a failure process where the local frictional heat, thermal expansion, contacting pressure and temperature grow...

...Ming Feng; Kyosuke Ono; Kenji Mimura In this paper, a mixed EHL analysis is presented for the variable torque slipping clutch with skewed rollers. It is characterized by a finite spatial curve contact and two dimensional rolling and slipping. A combination of the average roughness Reynolds equation...

...J. Y. Jang; M. M. Khonsari A comprehensive model is developed for analyzing the onset of thermoelastic instability in a wet clutch. For this purpose, appropriate governing equations are derived that take into account the porosity and deformability of the friction material. The effect...

...H. Gao; G. C. Barber; M. Shillor The engagement of a wet clutch with skewed surface roughness was investigated. A Weibull asperity height distribution rather than a Gaussian one was utilized in the asperity contact pressure model. The combined effects of surface roughness and skewness...

...H. Gao, Research Assistant; G. C. Barber, Professor This paper is focused on the real area of contact for paper-based wet friction materials during the engagement of wet clutches. The deformation of the wet friction material is identified as elastic during the engagement. A microcontact model...