Abstract A rectangular composite sandwich panel that is convectively heated by the external environment considered. physical and mathematical model consisting of two stages proposed to predict operability such a depending on heat transfer conditions. In first stage, unsteady temperature field determined from relations conduction problem. second parameters stress-strain state are quasi-static thermoelasticity Under conditions hinged at edges considered panel, general solutions problems...

Abstract The study is devoted to optimal design of gears with profile contact ratio ε α ≥ 2. Optimality criteria formulated as follows: the stresses in pitch point must take a minimum value when all constraints are met, first, 2 ensured. Variables planning defined. Formed system for variables planning. A LP τ -sequence method solving problem chosen. algorithm gear has been developed.

Abstract The essence of the research is search for geometric, material and technological limits new concept spinning spindles. Considering trend introducing generation electric drives into segment high-speed spindles (over 120,000 rpm), it necessary to map describe basic physical connections, find dependencies correlations individual design parameters their a Due limitations original years-used spindle drive with belt requirement production development spun fibers, expand knowledge concept,...

Abstract A mathematical model of profile shifted quasi-involute arc-tooth-trace gears is obtained. The includes functional relationships between the geometric-kinematic meshing characteristics and parameters generating surface as well conditions which allow to prevent teeth undercutting tip pointing. short analysis value along tooth trace done for pressure angle 20º. This was chosen it most common one general-duty gears, although basic rack in a variable quantity. can be used design cut by...

Abstract This study aims to improve the technology for processing parts from hard-to-work materials, and substantiate parameters of plasma-assisted machining surfaces alloy steel increase productivity ensure necessary quality surface layers. Theoretical studies consist in determining thermal field a workpiece during milling turning with plasma heating. Experimental are based on interrelationship main indicators factors preliminary heating allowance.

Abstract The article proposes a new technique for estimating the instantaneous supply in gear hydraulic machines. It takes into account peculiarity of movement radius connecting centers rotation gears with point engagement. dependence angular velocity and length on position engagement due to slipping working profiles teeth are determined. Estimation degree non-uniformity supply, accordance obtained model, differs significantly from traditional ideas about pulsation

Abstract The paper considers scientific principles of technological procedure development for the selection and assignment parameters velocity machining by blade tool at gear milling with due regard to required surface layer. Optimum micro-cutting conditions are determined when full participation in stock removal all mill teeth is provided. Technological regulation setting spread hobbing spur wheels fine-modular coarse-modular hardness (220...320 HV) after heat treatment (HRC46...63)....

The submitted contribution deals with the wear of thin coatings applied to convex–concave gearings for gear made from C45E steel. influence tribological characteristics (friction coefficient, wear, adhesion and hardness) TiN, TiCN combined coating + MoS2 on gearing is described, aspects scuffing formation. Scuffing tests were done C–C gears. Coatings by arc–ion-plating (AIP) magnetron sputter-ion-plating (MSIP) methods. thickness deposited its chemical composition determined SEM EDX...

Abstract An analytical method for determination of a stress condition butt welded thin-gauge plates with asymmetrical reinforcement is developed. The proposed allows take into account the effect load application eccentricity on tensile concentration factor (SCF) in weld root zone. It presented that bending stresses, caused by this eccentricity, result increasing total stresses up to 75%. results SCF calculations are good agreement obtained using finite element method.

Abstract The structure of steering gear’s HATLAPA mechanism is analyzed. It shown that presence redundant constraints in it increases laboriousness gear montage and respectively worsen maintainability. On the basis provided analysis developed with reduced more than twice constrainsts number.

Wear of TiAlCN coatings deposited on HCR (High Contact Ratio) gears was studied by the Niemann test during which tested were loaded up to 12th load stage. The resistance against scuffing evaluated based criteria allowable roughness (max. Rz 7 µm) and weight loss 10 mg). extent character wear influenced coating thickness, contact pressure meshing frequency. thicker tooth face started with smoothing surface protrusions. next stage characterized depletion coating. After a thickness about 2 µm,...

Abstract The structure of the MAK M43 diesel high pressure fuel pump driving is analyzed. It shown that presence redundant constraints in its mechanism reason roller bearings failure. proposed elimination by adding movabilities mechanism.

Wear of nonstandard involute gears with two types coatings, AlCrN and CrAlSiN, was studied. The coatings were applied by cathodic arc deposition. tested using a Niemann tester at graduated load up to the 12th stage compared noncoated gears. Both Biogear S150 gear oil PP90 universal hydraulic during these tests. thickness deposited wear teeth studied SEM their chemical compositions determined EDS analysis. Maximal contact pressure 1350 MPa calculated in region tooth flank stage. frictional...

Abstract An analytical method for calculation of local stresses in double-sided butt welded joints at misalignment welds’ axes is developed. The applicable thin-gauge plates with different geometry welds on the face and root sides under tensile load. In given example, it was shown that reach their maximum value zone transition from weld to base metal which farther axis weld. results calculations are good agreement obtained using finite element method.

The article is devoted to the study of influence modification paired evolute gearing with convex-concave contact on quality indicators transmission, namely, pressure and speed slippage in engagement. Previous studies gears showed presence characteristic zones side surface tooth, which have worse values than similar involute gear. One ways remove these or reduce their impact load capacity transmission modify tooth profile, will be implemented by shifting profile processing gear rack. A...

Abstract Based on the results obtained in previous research, values of meshing characteristics profile shifted quasi-involute arc-tooth-trace gears is calculated. The influence shift coefficient and angle tooth trace characteristic distribution flank surface along defined. can be used for design gears, cut by Gleason-type cutters with different value.

Reducing the mass and dimensions of gears is an actual task modern mechanical engineering. One perspective ways to solve for involute spur it use gearing with increased working tooth depth profile contact ratio εα ≥ 2. The study devoted development mathematical optimization model such gears. Optimality criteria formulated as follows: stresses in pitch point must take a minimum value when all constructive, geometric, kinematic, technological constraints are met, first, 2 ensured. equations...

Abstract A comparative analysis of well-known literary sources has been conducted to identify and summarize the main shortcomings existing freewheel ball clutches used in bicycles. The need improve operational characteristics order completely eliminate slippage during transitional modes operation convincingly demonstrated. This is due fact that they transmit torque through frictional forces between jammed balls working surfaces semi-clutches.

Abstract The presented studies made it possible to clarify the calculation model of diesel engine clutch with packages sleeve springs. stressed state spring packets is considered, while proposed place point application radial force, which bends package, in zone its greatest flexibility. Calculations performed according obtained expressions showed a coincidence results experimental by other authors within 4% and simulations conducted using automated design systems.

The article is devoted to the evaluation of use an involute spur gear with increased overlap ratio (HCR engagement) in wheel planetary gearbox T-150K tractor, which similar on-board transmission T-150 crawler tractor. main criterion for design new gears HCR engagement obtain greater than 2.03. Given that task replace existing ones, such parameters as center distance, widths crowns and number satellites were unchanged. It was allowed change within 3% compared basic one, but first all,...

The relevance of the scientific and practical task forming criteria objective functions in rational design two-shaft gearboxes is described. This has made it possible to understand need highlight topic conduct relevant research discussions on issue. most significant mass dimensional characteristics from perspective vehicle have been identified used as for optimal design. Specifically: center distance, which determines placement gearbox shafts its height; length gearbox, one main overall...

Reducing the mass and dimensions of involute spur gears is an actual task modern mechanical engineering. One perspective ways to solve it use gearing with increased working tooth depth profile contact ratio εα ≥ 2. The study devoted development optimal design methods for such gears. Optimality criteria formulated as follows: stresses in pitch point must take a minimum value when all constructive, geometric, kinematic, technological constraints are met, first, 2 ensured. Variables planning...

The relevance of illuminating contemporary stochastic algorithms is highlighted, with the past two decades witnessing a rapid development in algorithms, attributed to increased research capabilities and growing data volumes. These prove effective solving complex optimization problems, garnering attention from global scientific community practitioners worldwide. An exploration role an overview key crossover mutation operators represent pertinent practical endeavor, fostering deeper...