INERTIAL STAND WITH DIESEL ENGINE FOR COMPLEX STUDIES OF MECHANICAL TRANSMISSIONS AND THEIR UNITS OF LIGHT CATERPILLAR MACHINES

An inertial stand with an internal combustion diesel engine (ICE) was developed for comprehensive research and testing of fur transmissions and their units of light track vehicles (TV) with a large specific power (over 30 hp/t).

TECHNICAL PHENOMENA AS A MEANS OF FORMATION TECHNICAL LITERACY OF SCHOOLCHILDREN

The article substantiates the expediency of using narratives about technical phenomena in mechanical transmissions in the profile education of high school students as a means of forming technical literacy. Based on the methodology of the activity approach and the narrative way of interpreting technical knowledge, it was found that the operation of semantic information of technical content is the main condition for its perception and understanding by students. It was found that the stimulation of meaning making contributes to the activation of the humanitarian potential of technical knowledge. To master the knowledge of technical phenomena by high school students, it is necessary to choose the subject of interpretation, to include it in specific story lines. Having understood the explanation of the plot lines, students will realize the value-semantic aspects and study a fragment of the modern technosphere. It is established that the narrative explanation of technical phenomena in mechanical transmissions as the main elements of drives of working machines is organically intertwined in the context of the cultural concept of technological education of schoolchildren. The main learning outcomes of students will include experience of cognitive activity, experience of reproductive activity, experience of creative activity, experience of emotional and value relations. Emotional-value relations are acquired using reflection. The attitude of students to the object of knowledge is one of the main conditions for the transformation of technical knowledge into beliefs, which serve as a guide in the perception of the phenomena of the technosphere and contribute to the solution of technical problems. Technical ideas, beliefs and values will form the basis of technical literacy of high school students.

Analysis of Conceptual Solutions of Universal Helical Geared Reducers

Geared reducers are mechanisms designed to reduce the number of revolutions using geared elements and nowadays they present one of the most commonly used types of mechanical transmissions in mechanical engineering. Due to the different shapes of geared elements, there are different types of geared transmissions: helical, bevel, worm, special and combined transmissions. This paper analyses only helical geared transmissions, since there is a great extent of whole this matter. Helical transmissions are analysed only with external helical gearing, since internal geared pairs represent a special and very large group of gears. Within the external helical geared transmissions, only torque transmissions are analysed, while the transmissions of motion are not analysed and they represent another large group of transmissions. Only universal gear reducers with axial, or almost-axial, parallel shafts are considered (two-stage and three-stage transmissions). Although, single-stage gear reducer produced with parallel shafts are not considered by the paper in order to reduce the area of researching. Gear reducers are most commonly delivered to customer with electric motor, known as motor geared reducer, and they are studied here extensively. Gear reducer can be also delivered without motor, only with input shaft. The basic aim of this paper is to present all characteristics and specificities of motor geared reducer in one place.