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- Title
ВИЗНАЧЕННЯ ГІДРОДИНАМІЧНИХ ВТРАТ ПОТУЖНОСТІ В ЗУБЧАСТІЙ ПЕРЕДАЧІ. ТЕОРІЯ
- Authors
НОСКО, П. Л.; БАШТА, О. В.; БОЙКО, Г. О.; ГЕРАСИМОВА, О. В.; БАШТА, А. О.
- Abstract
The generalized criterion of high-speed gearing effectiveness can be considered gearing efficiency taking into account conditions and modes of its operation, materials and manufacturing technology, transmitted load and gear peripheral speed. Power losses can be divided into those that depend on the transmitted load - mechanical friction in the gears and bearings, and those that do not depend on the load - aerohydrodynamic resistance, periodic compression and expansion between the teeth. Depending on the operating conditions, different methods of oil supply to parts and gear units are used, the main of which are lubrication by immersion in an oil bath, spraying from the main oil bath and circulating oil supply. The ratio of aerodynamic and hydromechanical drag forces is determined by the oil level in the oil bath. For each i-th toothed gear, partially or completely immersed in the oil bath, the power expended to overcome the hydromechanical resistance can be represented as the sum of the moment of viscous friction forces at the ends of the toothed gear in the oil bath, the moment of viscous friction forces on the periphery of gear heads in the oil bath and the moment of Coriolis force, which occurs due to the radial movement of oil in the cavity of the gear. There is currently no generalized analytical model that combines all types of losses. As a result of mathematical modeling, analytical dependences of the toothed gear geometric and structural parameters influence on the power loss of hydrodynamic resistance to rotation are obtained. Theoretical studies have established the presence of two modes of oil movement in the tooth spaces of the toothed gears, which are characterized by the ratio of centrifugal, gravitational, hydrostatic and viscosity forces and Coriolis force. The calculation allows taking into account not only the influence of geometric parameters of gears immersed in the oil bath, but also design characteristics such as the depth of immersion of the gear and side clearance between the walls of speed reducer and the rotating toothed gear.
- Subjects
DRAG force; VISCOSITY; SPEED reducers; TORQUE; BEARINGS (Machinery); COMPRESSION loads; CORIOLIS force; DRAG (Aerodynamics)
- Publication
Problems of Friction & Wear, 2020, Vol 87, Issue 2, p101
- ISSN
0370-2197
- Publication type
Article
- DOI
10.18372/0370-2197.2(87).14735