Modeling the design of a high-speed reducer for a test bench in the CAD system environment
Students Name: Turiab Ivan Ivanovych
Qualification Level: magister
Speciality: Computer Engineering in Mechanical Engineering
Institute: Institute of Mechanical Engineering and Transport
Mode of Study: full
Academic Year: 2023-2024 н.р.
Language of Defence: ukrainian
Abstract: In the engineering industry, the use of gearboxes is quite common and at the same time necessary, regardless of whether it is artificial, serial or mass production. The main purpose can be formulated as auxiliary means that speed up, facilitate and allow to increase the efficiency of production. The main functions include the transmission of torque at a given speed. It is also necessary to ensure the alignment of the torques, which will increase the reliability of the gearbox operation The feature is that the gearbox must rotate around the axis of the motor flange so that the axial height of the output gears can be adjusted by +/- 50 mm in height. In addition, the gearbox will have a skew gear. Capture of axial forces from engagement will be carried out through axial rings located on the gears. Therefore, the development of a high-speed reducer with orientation along the vertical axis of the output shaft for the coaxiality of torque transmission is an urgent task and is of scientific interest. The object of the research: load on the design of the speed reducer. The subject of research: speed reducer under dynamic load and stress and deformations that occur in the process of torque transmission. The purpose of the research: development of a two-speed high-speed gearbox for a test bench. In the first chapter, an overview of transmission mechanisms is carried out. Based on the results of the analysis, it was established that the gearbox will have a skewed gear. Capture of axial forces from engagement will be carried out through axial rings located on the gears. The gearbox rotates around the axis of the motor flange so that the axial height of the output gears can be adjusted in height. Tasks have been set to realize the set goal of the master’s work. In the second section, the design of the gearbox and rotary platform is developed. 8 The constructive arrangement of the gears was carried out. Calculated based on gears, gears, shafts, and bearings. An assembly drawing and a 3D model of the gearbox were developed. The design of the rotary mechanism, which is actuated by a screw drive, has been developed. The worm wheel is part of the upper tipping plate. The inclination of the upper plate of the gearbox is carried out by the rotation of the worm shaft. There will be a sliding fit between the plate and the bottom of the case. In the third section, modal analysis is used to determine the dynamic properties of the structure. The result of this analysis is obtaining the values of natural frequencies, which correspond to the corresponding natural forms (oscillations). These self-oscillations occur in components during operation due to the action of various dynamic forces that cause mechanical oscillations. The value of these natural frequencies must be compared with the excitation frequencies. Resonance occurs when the natural frequencies are the same or close to the excitation frequencies. During resonance, the structure oscillates and the component undergoes dynamic stress. At the natural oscillation frequency of 2520,53 Hz, the simulation results showed that the oscillation amplitude does not exceed 0,0732 mm. These vibrations are on the surface of the case cover near the manipulation holes and on the hinges of the lower half of the case. There, the oscillation amplitude does not exceed 0,0659 mm. At the natural oscillation frequency of 2599,6 Hz, the oscillation amplitude is much less widespread on the surface of the gearbox housing. But in one edge near the hole 0.192 mm. At the natural frequency of 6102,74 Hz, the simulation results showed that the amplitude of oscillations does not exceed 0,216 mm. However, deformations are observed in the lower and upper parts of the hull on the stiffeners. Similarly, at the natural oscillation frequency of 6200,29 Hz, the deformation amplitude does not exceed 0,335 mm in only one place, and on the stiffening ribs of the upper cover - within 0,223 mm.. The fourth chapter provides an economic assessment of the project solution. The term of development and implementation of the project solution will last 89 days, and 9 the costs of its development and implementation will amount to UAH 51971,18. This project solution will have a term of use of 5 years. Annual costs for the operation of the design solution will amount to UAH 43595,0. The project solution will have a consumption price for the developer organization of UAH 166,17 per day and for the buyer organization - UAH 168,05 per day during the entire period of use. The project solutions obtained in the work and corresponding studies indicate their feasibility and practical use. Key words: gearbox, power, turning mechanism, CAD system, maximum stress, maximum deformation, modal analysis.