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Productivity of bridge cranes depends on performance of mechanisms of moving and lifting loads of bridge cranes. The article contains data on influencing speeds of crane’s movement, cargo cart, speed of loads lifting, and also ways of crane’s movement, cargo cart, height of lifting load and other factors on its productivity. There are presented functional dependences of bridge cranes’ productivity on influencing factors.

The authors have proved that computer modeling of mechanisms, components and parts of bridge cranes is an important element in forming optimal design decisions of structures in systems of computer-aided engineering. There is presented an algorithm for designing bridge crane, there are identified functional dependences of energy characteristics of the mechanisms of load lifting and movement.

The technical- economic report on new technics is carried out by comparison of its indicators and characteristics with similar achievements in world and domestic practice. The great value for increase of overall performance of the bridge crane has perfection of existing mechanisms of cranes, introduction of new, more progressive constructive decisions. Formulas for definition of expenses for designing of new technics, the cost price, annual production rate of the new (modernised) machines are resulted.