The object of study is a wave gear with a cam wave generator. One of the requirements for wave gears is to increase their efficiency. The article considers a refined method for determining the efficiency of a flexible bearing, taking into account the deformation of the flexible wheel, hard wheel, outer ring of the flexible bearing, cam shaft, shaft of the flexible wheel, as well as contact deformations of teeth, FB balls, roller paths of the outer and inner rings of the flexible bearing. According to the proposed method, the influence of the resistance moment, gear wheel displacement coefficients and radial deformation of a flexible wheel on the efficiency of a flexible bearing is investigated. The obtained dependencies expand knowledge about the influence of various factors of wave transmission of the efficiency of flexible bearings.
The article considers a mathematical model for determination of transition resistance in electrical contacts. The suggested model considers elastic, elastoplastic and plastic deformations of micro-protrusions on rough contact surfaces, the presence of surface films and dust particles on them. A theoretical dependence of possible contact failure on dust content has been obtained.
The article considers a mathematical model for determination of transition resistance in electrical contacts. The suggested model considers elastic, elastoplastic and plastic deformations of micro-protrusions on rough contact surfaces, the presence of surface films and dust particles on them. A theoretical dependence of possible contact failure on dust content has been obtained.
При проектировании волновой зубчатой передачи актуальной задачей является уменьшение ее кинематической погрешности, возникающей из-за деформации гибкого колеса, радиальных колебаний кулачка, погрешности изготовления и установки зубчатых колес. Обычно эту задачу решают путем повышения классов точности зубчатых колес и деталей, погрешности изготовления которых влияют на точность установки кулачка. Предложена математическая модель, позволяющая на этапе проектирования исследовать зависимость кинематической погрешности волновой зубчатой передачи от различных факторов. Разработана методика расчета, учитывающая упругое взаимодействие основных элементов передачи, погрешности их изготовления и установки. Приведены результаты теоретических исследований влияния углового положения гибкого и жесткого зубчатых колес на кинематическую погрешность волновой зубчатой передачи с кулачковым генератором волн. Доказана возможность снижения кинематической погрешности передачи за счет поворота неподвижного зубчатого колеса.Ключевые слова: волновая зубчатая передача, кинематическая погрешность, гибкое колесо, жесткое колесо, упругое взаимодействие When designing harmonic drives, it is important to address the issue of reducing the kinematic error of the drive occurring due to the deformation of the flexible gear, radial oscillations of the cam, manufacturing and installation errors of the gears. Conventionally, this problem is solved by increasing the accuracy class of the gears and the parts where manufacturing errors impact the accuracy of cam installation. A mathematical model is proposed that enables researchers to study the dependency of the kinematic error of the harmonic drive on various factors already at the design stage. Calculation techniques are developed that take into account elastic interaction between the main elements of the drive as well as manufacturing and installation errors. The results of theoretical studies of the influence of the angular position of the flexible and rigid gears on the kinematic error of a harmonic
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