ABOUT CALCULATION AND EXPERIMENTAL ESTIMATION OF WORKING CAPACITY OF BALL JOINTS OF A VEHICLE CHASSIS. PART 1. CALCULATION BY SRENGTH CRITERION

BOGDANOVICH Alexander V., D. Sc. in Eng., Assoc. Prof., Professor of the Department of Theoretical and Applied Mechanics, Belarusian State University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

The ball joints of vehicles are referred to the steering and suspension critical units. Strength calculation of the ball pin under static loading is usually performed in the practice of designing these units. In the article, the ball joint is considered as a tribo-fatigue system in which the zones that are dangerous in terms of bending stresses and wear are separated from each other, but are caused by the same load. The necessity of estimating the fatigue resistance of the  ball pin and taking into account the uneven distribution of wear over the mating surfaces of the ball head and the  liner is shown. The work is done in 2 parts. In the first part, the evaluation of the static and fatigue strength of the  ball pin is discussed, and in the second, the assessment of the wear resistance of the joint elements and the  proposal for a new method for testing the joint model are discussed.

ball joint, strength, wear resistance, friction, contact pressure, wear rate, tribo-fatigue system,
wear-and-fatigue tests

1. Mikhaylovskiy I.A., Gun I.G., Salnikov V.V., Kutsepednik  V.I., Gun E.I. Raschetnoe opredelenie pokazateley prochnosti sharovykh sharnirov elementov shassi avtomobilya putem modelirovaniya protsessa staticheskikh ispytaniy [Estimated determination of the strength indicators of ball joints of the  vehicle chassis elements by simulating a static test process]. Issledovaniya, konstruktsii, tekhnologii [Research, constructions, technologies], 2014, no 2. pp. 20–24.
2. Reimpel J. Fahrwerktechnik: Lenkung. Würzburg, Vogel Communications Group GmbH & Co. KG, 1985. 296 p.
3. Chernova G.A., Tyshkevich V.N., Badikov K.A., Moiseev  Yu.I., Zabolotnyy R.V. Otsenka rabotosposobnosti sharovogo paltsa avtobusa “Volzhanin-32901” s raschetom na ustalostnuyu prochnost [Estimation of operation capability of the ball pin of  the “Volzhanin-32901” bus with relation to fatigue strength]. Problemy mashinostroeniya i nadezhnosti mashin [Problems of  mechanical engineering and machine reliability], 2014, no  4.   pp. 50–54.
4. Afanasev B.A., et al. Proektirovanie polnoprivodnykh kolesnykh mashin. Tom 3 [Design of four-wheel drive machines. Volume  3]. Moscow, Moskovskiy gosudarstvennyy tekhnicheskiy universitet im. N.E. Baumana Publ., 2008. 432 p.
5. State Standard 25.504-82. Raschety i ispytaniya na prochnost. Metody rascheta kharakteristik soprotivleniya ustalosti [Calculations and strength tests. Methods for calculating fatigue resistance characteristics]. Moscow. Mezhgosudarstvennyy sovet po standartizatsii, metrologii i sertifikatsii Publ., 1982. 122 p.
6. Reshetov D.N., Ivanov A.S., Fadeev V.Z. Nadezhnost mashin: uchebnoe posobie dlya vuzov [Machine reliability: textbook for universities]. Moscow, Vysshaya shkola Publ., 1988. 237 p.
7. Troshchenko V.T., Sosnovskiy L.A. Soprotivlenie ustalosti metallov i splavov: spravochnoe posobie v 2 t. [Resistance to fatigue of metals and alloys: reference book in 2 volumes]. Kiev, Naukova dumka Publ., 1987, vol. 1, 510 p., vol. 2, 825 p.