The article, dedicated to the 35th anniversary of the start of production at the Volgograd Tractor Plant of the tracked agricultural tractor DT-175S "Volgar", tells about the history of the creation of this unique machine in its own way. (Research purpose) The research purpose is in analyzing the history of the creation and produc-tion, the effectiveness of the use of the DT-175S "Volgar" tractor, considering the stages and directions of its improvement. (Materials and methods) The article de-scribes the history of the creation of the high-speed energy-saturated tractor "Volgar", gave its design features, technical characteristics in comparison with its predecessors, the results of tests in various soil and climatic zones, on various agricultural opera-tions. (Results and discussion) In the DT-175S "Volgar" tractor, the designers, in close cooperation with scientists, embodied the results of research aimed at increasing the working speeds of machine-tractor units, and the most advanced technical solu-tions in the field of tractor construction at that time. The main of these solutions is an automatic continuously variable hydro-mechanical transmission. The combination of a powerful (125 kilowatt) engine with a similar transmission allowed not only signifi-cantly increase the working speed and productivity of the tractor, up to 9-15 kilome-ters per hour, but also significantly reduce the labor intensity of the tractor driver. The article presents the information about the improvement, modernization of the tractor, the creation of various specialized modifications on its basis. DT-175S "Volgar" be-came the most powerful serial machine of the Volgograd Tractor Plant, rightfully earned the respect of specialists of farms and machine operators. (Conclusions) The tractor became the most powerful serial machine of VgTZ, earned the respect of quali-fied machine operators and specialists of farms. Further development of the applica-tion of the automatic hydro-mechanical transmission on agricultural tractors was to receive the VT-200D tractor of 5th traction class with a capacity of 147 kilowatts. Due to the complication of the economic situation, the production of this tractor was lim-ited to only a small experimental batch.
BACKGROUND: The most important task, that supported the formation of mechanized agriculture in the 192030s, was the creation of domestic tractor industry. The Stalingrad (Volgograd) Tractor Plant, being the flagship of this important industry for many years, played a fundamental role in its development. AIMS: Justification of the relevance of the tractor industry creation within the process of the country industrialization. Analysis of the advantages of tracked tractors in comparison with wheeled tractors, justification of need for their mass production, determination of trends in the development of technical and operational characteristics of general purpose tracked tractors. METHODS: Analysis of the evolution parameters of the design of tracked tractors, produced by Stalingrad (Volgograd) Tractor Plant throughout its operation years, analysis of technical specification of the ten highest performance tracked tractors, produced in different years by this enterprise. RESULTS: It is found that the first tracked models were based on wheeled tractors, met the operation requirements in the soil and climate conditions of our country in the best way, as well as satisfied the need for the use of such machines for military purposes. The importance of using the energy saturation indicator as the main factor of the tractor performance at increased velocities is justified; the graph of behavior of this indicator, depending on production year, is given and trends of its further growth are noted. CONCLUSIONS: The energy saturation of tracked tractors, produced by the plant for 55 years, has increased by 1.85 times, from 7.5 to 13.91 kW. The experience of Volgograd tractor manufacturers should be analyzed and used in order to identify patterns, trends and modern directions of the tractor technology development.
The article, dedicated to the 35th anniversary of the start of production at the Volgograd Tractor Plant of the tracked agricultural tractor DT-175S "Volgar", tells about the history of the creation of this unique machine in its own way. (Research purpose) The research purpose is in analyzing the history of the creation and production, the effectiveness of the use of the DT- 175S "Volgar" tractor, considering the stages and directions of its improvement. (Materials and methods) The article de-scribes the history of the creation of the high-speed energy-saturated tractor "Volgar", gave its design features, technical characteristics in comparison with its predecessors, the results of tests in various soil and climatic zones, on various agricultural operations. (Results and discussion) In the DT-175S "Volgar" tractor, the designers, in close cooperation with scientists, embodied the results of research aimed at increasing the working speeds of machine-tractor units, and the most advanced technical solu-tions in the field of tractor construction at that time. The main of these solutions is an automatic continuously variable hydro-mechanical transmission. The combination of a powerful (125 kilowatt) engine with a similar transmission allowed not only signifi-cantly increase the working speed and productivity of the tractor, up to 9-15 kilometers per hour, but also significantly reduce the labor intensity of the tractor driver. The article presents the information about the improvement, modernization of the tractor, the creation of various specialized modifications on its basis. DT-175S "Volgar" be-came the most powerful serial machine of the Volgograd Tractor Plant, rightfully earned the respect of specialists of farms and machine operators. (Conclusions). Further development of the application of the automatic hydro-mechanical transmission on agricultural tractors was to receive the VT-200D tractor of 5th traction class with a capacity of 147 kilowatts. Due to the complication of the economic situation, the production of this tractor was lim-ited to only a small experimental batch.
85 years ago, on 11 July 1937, the production of the STZ-NATI, the famous and deservedly popular tracked agricultural tractor, was launched at Stalingrad Tractor Plant. This tractor was the first which had completely domestic deisgn. Development of this tractor is an example of effective collaboration between the design engineers of STP and the scientists of All-soviet Scientific Research Tractor Insitute (NATI). In comparison with the predecessor, the STZ-1 wheeled tractor, the STZ-NATI was better suitable for soil, climate and road conditions of the USSR, 73% more powerful, much more productive and efficient. The production of this tractor was launched at Kharkiv Tractor Plant in the same year under the name of SKhTZ-NATI or KhTZ-NATI and at the newly-established Altay Tractor Plant in 1942, during the Great Patriotic War (ASKhTZ-NATI or ATZ-NATI). On the basis of the STZ-NATI and KhTZ-NATI agricultural tractors, the STZ-5 transport tractor and the STZ-8 swamp tractor were developed and produced at STP, the KhTZ-T2G gas generator tractor and the KhTZ-16 armoured tractor were developed and produced at KhTP. The ASKhTZ-NATI tractor production at STP and KhTP continued until 1949, the production at ATP continued until 1952, when the tractor was succeeded by the DT-54 diesel tractor. Three plants produced around 200,000 ASKhTZ-NATI tractors. Cutting-edge and successful design solutions, implemented in the tractors design, were used in tractors of STP/VgTD, KhTP and ATP for a long time and still find place in Chinese YTO tractors.
Possessing deep knowledge of mathematics and general mechanics, V.P. Goryachkin applied them to the design analysis of agricultural machines. Thereby at the beginning of the twentieth century, he established a new scientific discipline, which he called “Agricultural Mechanics”. Within the framework of this science, he also solved some theoretical problems of the tractor. He was engaged in the design of tractor equipment and recommendations for its development during numerous tests at the Machine Testing Station headed by him and within the framework of the government commission. The purpose of the research was to identify the theoretical and practical contribution of V.P. Goryachkin in the establishing of the tractor science and the domestic tractor construction. In accordance with the methods used in the history of science and technology, the author established that V.P. Goryachkin developed the theory of the driving and driven wheels of the tractor, justified proposals for improving the characteristics of the engine and the location of its longitudinal axis relative to the tractor’s travel direction, established the relationship between the tractor power and the operating speed, solved the constructive and power problems of coupling the tractor with a plow, formulated recommendations for improving mechanical propulsion and engines. Conducting numerous tests of tractors in the 1920s, and participating in the work of the government commission, V.P. Goryachkin contributed much to the development of the tractor industry. His recommendations greatly helped determine the pace and trends in the development of tractor construction in the USSR. Based on the conducted research, the author states that by his theoretical research and practical achievements, V.P. Goryachkin made a significant contribution to the history of domestic tractor construction, so his name should be mentioned along with other pioneers of the domestic tractor industry.
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