Brake trains

Brakes of railway vehicles - area of transport technology, without deep knowledge of a locomotive engineer can achieve professional excellence.

The main purpose of the site - to provide engine-drivers, especially young, novice, practical assistance in the proper management of automatic brakes in the management of trains. It is from these positions are considered the most important issues relating to driving trains increased weight and length, operation of brakes, brake theory, construction of separate brake devices and equipment. Good knowledge of these materials is necessary and in the exams for the right to drive a locomotive, as well as the upgrade of drivers, which reduces the likelihood of accidents and injury to persons . Reduced to the most simple form formulas allow the reader to make himself necessary braking calculations.

In accordance with the standard CMEA 1052-78 is a transition to an international system of physical units (SI), which, as the units of measurement are used: the unit of length - meter (m), time - second (s), the mass - kilogram (kg) . The unit of force in this case is a derivative and is defined as the force that provides a mass of 1 kg of acceleration of 1 m/s2. This power unit was named the Newton (N) and has dimension arising from the second law of mechanics (F = TA, where F - force, T - mass, A - acceleration): N = kg * m/s2.

Widely used in machinery and transport unit of force - kilogram force (kgf) is equal to 9.81 N and ton-force - 9,81 kN. Given that the unit kg and n are related to N and KN through the constant dimensionless coefficient of 9.81, and that the conversion of a number of regulations of the Ministry of Transport, through the coefficient of 9,81 for the expression of them in H will bring up the fractional values, inconvenient for practical use ( For example, the estimated depression cast iron brake shoes wagon axle will be laden mode 68,7 N, on average - 49 H, on empty - 34,3 H)

State Standard, as an exception, agree to use the rules of traction calculations of the international system of units, using as units of force kgf and tf. In this case, the weight in kg, and n, defined by the standard acceleration of gravity g = 9,81 m/s2 (as is known, the acceleration of gravity varies with latitude and altitude above sea level) is numerically equal to the weight in kilograms (kg) and tonnes (t).

Used in traction and braking force calculation unit, ie, the forces acting on unit mass of the rolling stock of traction, braking, resistance movement, the gradient path, have the dimension kilogram-force per tonne (kg / t).

Power to Specific kgs / m numerically equal to the acceleration from this force, pronounced at 10-3g. This follows from the second law of mechanics a = F / M.

Specific braking force is usually determined by the braking coefficient. If we take as the ratio of the brake pressed to the masses, then bi = 1000 r? Cr kg / t. The proposed book to your attention the following dimensions izicheskih variables: length - meter (m), kilometer (km) time - second (s), minute (min), hour (h); force - kilogram force (kgf), ton -force (tf); weight - kilogram (kg), tonne (t), speed-m / s, km / h, the area - cm2, dm2; volume - cm3 dm3, m3; pressure - kgf/cm2.

To some extent, the book draws the quiz " Have you watched automatic brakes ? "Organizational leadership exercised quiz former chief editor of the electric and diesel traction, Alexei Ivanovich Potyomina, and in its preparation involved engineers, to send material to use the brake equipment, and well as leading specialists tormozniki vols. VI Krylov, Canines EV, Kovrizhkin NP, Klimov, NN, Tikhonov P. C, Second AK, Albegov NA, Abashkin IV, Sharunin A. A. Yasentsev VF, Posmityuha AA Krylov, VV et al