| Abstrakt: |
Truck pulling unit is a self-propelled machine that moves on all types of roads and is designed for the development, maintenance and overhaul of oil and gas wells. One of the most time-consuming operations, performed by the machine is "lowering - lifting" of pipes, weight of which can reach 80 tons or more. In Ukraine, this type of machines is manufactured by the Kharkov Plant of Transport Equipment (HZTO) on all-wheel drive (6x6) chassis of the truck KrAZ-63221-02, lifting capacity of which is 80 tons UPA-80PKh. This unit has eight speed transmission ranges in the "lifting" operation mode, which are provided by speed manual transmission, and winch band brake, which overheats and breaks down because of cyclic operations is a key braking element in the "lowering" operation mode. The authors propose to install stepless hydrostatic-mechanical transmission with foreign or domestic hydraulic units instead of a manual transmission of the truck KrAZ-63221-02, intermediate support and helical gear unit. Compiled and analyzed mathematical model of the proposed transmissions indicates that the use of stepless transmissions on the UPA-type machines is promising and feasible since this transmission can be used in two operation modes of "lowering - lifting". Herewith, band brake becomes an auxiliary element, and transmissions provide the operation of units with the weight of up to 100 tons. [ABSTRACT FROM AUTHOR] |
