REDUCTION OF THE TENSION OF MODIFIED TEETH OF NOVIKOV GEARING IN THE THREE-STEP GEARBOX Ц3НШ-450-40 DRIVE OF OIL PUMPING UNIT

Abstract

The article is devoted to the actual topic – reduce the tension of the modified teeth of Novikov gearing drive gearbox of widely used oil pumping unit for oil production in order to increase the resource of their work and load-bearing capacity. As the object is considered a typical three-stage gearbox model Ц3НШ-450-40, produced by the plant “Izhneftemash” (Izhevsk). Gearbox is equipped with Novikov gearing with the basic rack profile according to GOST 15023–76. It is shown that the use of the proposed longitudinal modification of the working surfaces of the teeth in combination with an increase in gear module provides a very significant effect on reducing effective contact and bending stresses, on increase the load-bearing capacity and service life of the gearbox in comparison with the serial version currently produced by the domestic industry. The research is based on the results of solving the spatial contact problem of the stress-strain state of a tooth, as well as modeling the real multipoint engagement of Novikov gearing taking into account the technological errors of manufacture and assembly of gears. Recommendations on the implementation of the longitudinal modification of the teeth are given and it is shown that there are no technological difficulties. The effect achieved at different stages of the gearbox is: to reduce tooth stresses from 1.75 to 2.54 times, to increase the load-bearing capacity of the gearbox from 2.81 to 4.1 times, to increase the service life of the gearbox by an order of magnitude. In the future, the research outlined is supposed to spread to other models of gearboxes produced oil pumping units.