Study of the friction of the brake shoe of a freight car

Inagamov, Sardor; Djabbarov, Shukhrat; Abdullaev, Bakhrom; Ruzmetov, Yadgor; Inoyatov, Kamoliddin; Hurmatov, Yahyo

doi:10.1051/e3sconf/202340105036

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…In the case of freight wagons, the harmful friction of brake pads occurs due to the slope of the surface of the brake pad making contact with the running surface of wheels when the brake is not engaged. Such friction causes harmful consequences for freight railway transportation [6][7][8]. The train's resistance to movement increases depending on the kilowatts of electricity consumed, resulting in thousands of tons of diesel fuel being wasted.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Asymmetric Wear of Brake Pads on Freight Wagons despite Full Contact between Pad Surface and Wheel

Panchenko,

Gerlici,

Lovska

et al. 2024

Symmetry

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This article presents the results of a study focused on identifying the main causes of the asymmetric (clinodual) wear of composite brake pads on freight wagons. A new scientific approach to determining the clinodual wear of composite brake pads on freight wagons is proposed. It is established that the harmful abrasion of the pad occurs during the movement of the freight train due to an imperfection in the bogie-brake lever transmission. The causes of the non-normative frictional wear of composite brake pads were investigated. This kind of wear leads to the tilting and abutting of the upper end of the brake pads against the rotating wheel during train running. The results of geometric and kinetostatic studies of the “pad–wheel” tribotechnical pair are provided to establish the causes and consequences of the accelerated clinodual frictional wear of composite brake pads on pendulum suspension in the bogies of freight wagons. The conditions of rotation of the wheels during braking “for” and “against” the clockwise direction depending on the direction of the train are considered. A new approach to brake-pad-wear prediction depending on the mileage of wagons under operational conditions is proposed. The research conducted in this study contributes to the development of the mechanical parts of freight-wagon brakes, increasing the efficiency of brake operation and improving the safety of train traffic.

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Section: Introductionmentioning

confidence: 99%

Analysis of Asymmetric Wear of Brake Pads on Freight Wagons despite Full Contact between Pad Surface and Wheel

Panchenko,

Gerlici,

Lovska

et al. 2024

Symmetry

View full text Add to dashboard Cite

show abstract

“…quantity of axle box unit in bogies, pcs. ; fr0coefficient of friction of rolling elements on bearing rings (usually taken ~1•10 -6 ), m; Nbnormal reaction per one rolling bearing, or force acting on the most loaded rolling element and determined by the formula, kN[10]: taking into account the fact that 𝑛𝑛 retotal number of rolling elements taking the load in each bearing, pcs. ; ka constant coefficient taken depending on the row and type of rolling bearings (for single row bearings k= 4, for roller bearings with nb = 10…20 average value k  4.…”

mentioning

confidence: 99%

Mathematical modeling of the rolling speed of a car on the first profile site of the slide

Abdullaev,

Adilov,

Juraeva

et al. 2023

E3S Web Conf.

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The article shows the consideration of the rolling friction moments (pure rolling) of the wheels on the rail threads and in the bearings of the front axlebox units. and rear bogies of the car with their subsequent replacement by conditional sliding friction. It is noted that if the active force in the form of a projection of the force of gravity and the aerodynamic drag force on the direction of rolling of the car (or release), acting on the car, is greater than the limiting friction force, then simultaneously with rolling, the wheels may also slip on the rail threads. An analytical formula was obtained for finding the difference between the driving forces and all resistance forces when rolling wheels with sliding, which, based on the theorem on the change in the momentum of a material point, made it possible to create a mathematical model for finding the speed of a single car (or cut) on the first profile section of the hump. An analysis of the results of solving the problem of determining the rolling speed of a car has been carried out. It is noted that the theorem on the change in the momentum of a material point for solving the problem of finding the time of rolling down a hill is applicable only when the final speed of the car is known, otherwise solving the problem in such a formulation will be meaningless.

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Influence of wear of friction wedges of model 18-100 trolleys on the lifetime of the comb

Gayipov,

Galimova,

Xurmatov

et al. 2023

E3S Web of Conf.

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The issue of the influence of wear of friction wedges on the wear of the flange thickness of wheel pairs of freight cars operating on the railways of the Republic of Uzbekistan is considered. An analysis of freight car uncouplings during current uncoupling repairs is presented based on malfunctions of the thin flange of the wheel pairs and overestimation/underestimation of the friction wedge relative to the supporting surface of the bolster more than normal. Methods of combinatorial and statistical analysis of source data were used. The parameters of freight car bogies that most influence the wear of the flange of wheel pairs have been studied. Ways to reduce wear on the flange of wheel pairs in operation are considered by tightening the regulatory requirements established when releasing bogies from repair based on the condition of the friction wedges. The results obtained indicate a decrease in wear on the flanges of wheel pairs and an increase in the service life of the wheels of bogies of 18-100 freight cars when following the recommendations of the article on the repair of bogies.

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Study of the friction of the brake shoe of a freight car

Cited by 7 publications

References 5 publications

Analysis of Asymmetric Wear of Brake Pads on Freight Wagons despite Full Contact between Pad Surface and Wheel

Analysis of Asymmetric Wear of Brake Pads on Freight Wagons despite Full Contact between Pad Surface and Wheel

Mathematical modeling of the rolling speed of a car on the first profile site of the slide

Influence of wear of friction wedges of model 18-100 trolleys on the lifetime of the comb

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