Actual Problems in Machine Building 2018 Vol. 5 No. 1-2

Актуальные проблемы в машиностроении. Том 5. № 1-2. 2018 Технологическое оборудование, оснастка и инструменты ____________________________________________________________________ 71 машиностроении: сборник трудов VIII Международной научно-практической конференции, 28–30 сентября 2017 г. – Новосибирск: Изд-во НГТУ, 2017. – С. 167–173. 2. ГОСТ 3325–85 Подшипники качения. Поля допусков и технические требования к посадочным поверхностям валов и корпусов. Посадки. – М.: Изд-во стандартов, 1985. – 40 с. 3. Henzold G . Geometrical dimensioning and tolerancing for design, manufacturing and inspection. – London: Gardners Books, 2006. – 416 p. 4. Тверской М.М . Расчет размерных цепей со звеньями-эксцентриситетами // Вестник ЮУрГУ. Серия «Машиностроение». – 2005. – Вып. 6, № 1 (41). – С. 168–180. 5. Смирнов В.В., Фирсов А.М., Овчаренко А.Г. Модель определения положения замыкающего звена плоской векторной размерной цепи со звеньями-эксцентриситетами [Электронный ресурс] // Южно-Сибирский научный вестник. – 2017. – № 4 (20). – С. 259– 262. – URL: http://s-sibsb.ru/issues-of-the- journal.html?sobi2Task=sobi2Details&catid=46&sobi2Id=419. ANALYSIS OF PLANE VECTOR DIMENSIONAL CHAIN FOR MODERNIZED PIVOT UNIT OF CAR UAZ Firsov A. M., Ph.D. (Engineering), Associate Professor, e-mail: firsov.am@yandex.ru Ovcharenko A. G., D.Sc. (Engineering), Professor, e-mail: tmk@bti.secna.ru Smirnov V. V., Ph.D. (Engineering), Associate Professor, e-mail: smirnov@bti.secna.ru Biysk Technological Institute (branch) of the Altai State Technical University, 27 Trofimova str., Biysk, 659305, Russian Federation Abstract The authors consider the upgrade of the steering knuckle supportfor UAZ-3163. This modernization consists in the fact that instead of hemispherical supports in the connection there are rolling bearings. Qualitative analysis says that when assembling a unit, the cylindrical surfaces of the parts will be located with deviations from alignment with each other. The actual deviation from alignment in the assembled node corresponds to the total eccentricity - the closing link of the vector dimension chain. The component links-eccentricities of this dimensional chain are random variables; they have a statistical distribution that obeys Rayleigh's law. The authors developed a simulation mathematical model. This model allows to determine the probable value of the total eccentricity, and also to calculate the probable percentage of rejects during assembly of the unit. The result of the computational experiment shows that the probable rejection at the assembly of the pivot unit will be about 78%. This raises questions about the feasibility of this modernization. Keywords Car UAZ, steering knuckle support, kingpin, tolerance chains, eccentricity, durability.