Safety-overrunning ball-type clutch parts contact interaction features

: 38-43
Received: February 16, 2022
Revised: March 22, 2022
Accepted: March 30, 2022
Department of Transport Technologies and Mechanical Engineering Department
Lviv Polytechnic National University
Air Force Institute of Technology
Department of Transport Technologies and Mechanical Engineering Department,

The article deals with the field of machinery, namely, with the protecting of devices for mechanical driving systems. Safety-overrunning clutches, operating on gearing principle, where safety and overrunning parts are mutually integrated, are perspectives for the  building based on modular machines. This case is due to their compactness and low components, comparatively with combined constructions. New clutch design is investigated insufficiently. Particularly their calculation methods, namely parts contact stresses determination, developed deficiently. For ball-type overrunning clutches, contact strength calculations are well-developed, but its transference on new construction safety-overrunning clutches is impossible because of the difference between parts contact interaction in those clutches. The aims of the article are: to analyze created by authors safety-overrunning ball-type clutch parts contact interaction features; to  propose on its base clutch construction improvement which could provide parts contact stresses minimization out of dependence with clutch manufacturing and assembling accuracy; taking into account Hertz contact interaction theory results, to obtain expressions  for  determining  clutch parts loads and contact stresses. It is established that using safety-overrunning clutch grooves parallel to radius side surfaces is inexpedient. This can increase balls  and internal  semi-coupling  grooves edge  contact and significant  contact  stresses. To exclude the impact of clutch parts manufacturing and assembling accuracy on contact stresses in paper, proposed to incline grooves side surfaces at an angle to the semi-couplings radius, passing through the ball centre in diametric section. Comparatively, contact grooves inclination to radius with the edge allows decreasing contact stresses in 45–55 times. Further investigations should be focused on force parameters and operating  characteristics justification for a clutch with inclined grooves proposed in this paper. 

[1] B. M. Hevko, I. V. Lootsiv, I. B. Hevko, et. al. “Pruzhno-zapobizhni mufty: konstrukciya, rozrakhunky, doslidzhennya” [“Flexible-safety clutches: construction, calculation, study”]. Ternopil, Ukraine: Publishing  house “FOP Paljanyca V.A.”, 2019. [in Ukrainian]. 
[2] V. O. Malashchenko, V. M. Strilets, O. R. Strilets, V. A. Fedoruk, “Novy mufty mekhanichnikh privodiv mashyn” [“New couplings of machine mechanic drivings”]. Rivne, Ukraine: Publishing house “NUWHР”, 2019. [in Ukrainian]. 
[3] Y. Hanqi, Z. Chenyi, G. Bingzhao, “Fork-less two-speed I-AMT with overrunning clutch for light electric vehicle”, Mechanism and Machine Theory. vol.  130. pp. 157 - 169,  2018., 
[4]V. O. Malashchenko, P. Hashchuk, O. Sorokivsky, V. V. Malashchenko, “Kulkovy mekhanyzmy vilnogo khodu” [“Ball-type freewheel mechanisms”]. Lviv, Ukraine: Novy Svit-2000, 2012. [in Ukrainian]. 
[5]  V.  O.  Malashchenko,  G.  P.  Kunytskiy,  “Navantazhuvalna  zdatnist  velykomasovykh  system”  [“Load capacity of large-mass systems”]. Lviv, Ukraine: Novy Svit-2000, 2020. [in Ukrainian]. 
[6] Y. Kharchenko, L. Dragun “Mathematical modeling of unsteady processes in electromechanical system of ring-ball mill”, Diagnostyka, vol. 18(1). pp. 25–35, 2017. 
[7] A. O. Borys, “Pokrashennya efektivnosti mekhanychyh pryvodiv zastosuvannyam obginno-zapobizhnykh muft” [“Improvement of the efficiency of mechanical drives by theuse of ball-type safety-overrunning cclutches”], Ph.D. dissertation, Lviv Polytechnic National University, Lviv, Ukraine, 2019. [in Ukrainian]. 
[8]  K. Roczek,  A. Krol,  “Clutch-brake  unit  –  principle  of  operation and basic diagnostic  methods”, Diagnostyka, vol. 19(1).pp. 33–39, 2018., 
[9] V. Malashchenko, V. Protsenko, S. Klysz, V. NastasenkoandM. Babiy, “Force parameters and operating characteristics of safety-overrunning ball-typeclutch”, Diagnostyka, vol. 22(3). pp. 43–50, 2021., 
[10]  V.  T.  Pavlishche,  Y.  V.  Kharchenko,  A.  F.  Barvinsky,  Y.  G.  Garshnev,  “Prikladna  mekhanika” [“Applied Mechanics”]. Lviv, Ukraine: Intelect-Zakhid, 2004. [in Ukrainian]. 
[11] V. A. Zinovjev, “Teoriya mekhanizmov i mashyn” [“Mechanisms andmachines theory”]. Moscow, USSR: Mashgiz, 1959. [in Russian]. 
[12] M. N. Pylipenko, “Mekhanizmy svobodnogo khoda” [“Freewheel mechanisms”]. Moscow, USSR: Mashinostoenie, 1966. [in Russian].