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Abstract. The issue of designing drives, which provide low frequency (max. 1 rotation per minute) rotation with a big moment (min 1 MN m) of large technical bodies utilized in restricted spaces, is a complex and contradictory one. The drives of geokhod propeller, rotor actuators of tunneling machines with overload protection, as well as actuators of other machinery meeting aforementioned requirements are examples of such machines. The paper considers mathematical model developed by the authors which determines the relation of design factors of transmission tooled with hydraulic cylinders to kinematic parameters of output element movement. The paper also provides description of methods to determine pumping unit efficiency for rotary transmission tooled with hydraulic cylinders.

The paper presents the results of theoretical and experimental research in revealing the influence of form and geometrics of internal chamber of synchronization devices with steel-balls of fluid coupling on loading capability.

The article describes the version of safety fluid couplings where synchronization is ensured by using the lockup device with steel balls. The ways to increase the load capacity of the lockup device are considered. The mechanical behavior of the safety fluid coupling with the lockup device used for synchronizing has been parameterized in the course of experiments.

The article presents the features that characterize the complexity and novelty of the main functional systems of underground machines of the “Geokhod” class as an object of design and production. The authors discuss the problems that developers encountered at all stages of creating test models and prototypes of a new class of underground machines “Geokhod”. The lack of special scientific and methodological support is a deterrent to the creation of a new class of underground vehicles. Taking into account the peculiarities of work, interaction with the geo-environment of tunneling underground machines of the “Geokhod” class, the need arose to create a scientific specialty that will be associated with the design and construction of tunneling underground equipment. Thus, by analogy with the aircraft industry, the support for the creation of underground machines interacting with the geo-environment should be assigned to a new scientific profile and the scientific specialty “Construction of underground machines that interact with the geo-environment”. A new scientific direction is considered as a key element of an advanced technological structure for the development of underground space on the basis of advanced development and new approaches in construction geotechnology and geotechnics.