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5CENTRAL ASIAN ACADEMIC JOURNAL OF SCIENTIFIC RESEARCH
ISSN: 2181-2489 VOLUME 2 I ISSUE 5 I 2022
Scientific Journal Impact Factor (SJIF 2022=4.63) Passport: http://sjifactor.com/passport.php?id=22230
DEVELOPMENT OF METHODOLOGY FOR CALCULATING TRANSMISSION OF WHEEL VEHICLES WITH 4 x 2 WHEEL POSITION
Ergash Ulugbekovich Ismailov
Tashkent State Transport University, Faculty of Automotive Engineering, Master's 2nd
year student
The objective of the paper is the development of the method for the calculation of the required force of shaping of a horizontal shape-forming machine used in the preproduction workflow. The design of a machine for horizontal shape-forming of wheel steel rims enables quick readjusting and transfer to another rim shape, which is significant under the conditions of frequent alteration of the product nomenclature. We developed the calculation method based on the assumptions of the deformations continuity, the constancy of the volume at plastic deformation and axisymmetric stressed state as well as the local application of the load.
Keywords: plastic deformation, 4 x 2 wheel location, wheel vehicles, calculation method.
At vehicle movement, there are two factors that specify conflicting requirements for transfer box drive and axle drive. Let's describe them: each wheel rotating at different speeds and reduced adherence of one or more wheels. These factors tend to be of time-varying nature. The nature of the studied processes is transient; it will be influenced by the inertia, stiffness and damping properties of the vehicle power train parts. All this makes the task to solve the task by the dynamics methods.
To assess the applicability of drive of a particular type at designed or already existing vehicle, a mathematical model of all-wheel-drive vehicle was developed to determine the main force and kinematic parameters of movement under the specified road conditions.
In analytical studies, the vehicle is represented as a multimass dynamic system, where J1, J2, J3, J4, J5, J6, Jxz ,,,,,, 654321 - are the rotational inertia of the flywheel and the moving mass of engine, the rotational inertia of clutch parts, gearbox and transfer case reduced to the carrier of the central differential, the rotational inertia of sun gear and ring gear and reduced parts, the rotational inertia of front and rear wheels, the rotational inertia of vehicle frame in the xz-plane with respect to the center of mass; m - vehicle mass. In the dynamic system, in addition to the drive circuit, the changes in soil reactions to the wheels, the stiffness and
ABSTRACT
UZBEKISTAN
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CENTRAL ASIAN ACADEMIC JOURNAL ISSN: 2181-2489
OF SCIENTIFIC RESEARCH VOLUME 2 I ISSUE 5 I 2022
Scientific Journal Impact Factor (SJIF 2022=4.63) Passport: http://sjifactor.com/passport.php?id=22230
damping properties of the transmission parts, and the spin of the drive wheels are taken into account.
At the development of the mathematical model, the following assumptions are made:
• the frame of the machine is a solid body with a longitudinal axis of symmetry;
• through-the-thickness slip of the tires of the driving wheels is neglected; frictional forces in the transmission element are considered to be zero;
• assume the conditions for the adherence of the right and left wheels of the same bridge to be the same.
L-L-J
Fig. 1. Scheme of forces acting on the vehicle
Figure 2 shows the dynamic model of a wheeled vehicle with a differential transfer box drive, Figure 1 shows the forces acting on the wheeled vehicle, where T1, T2 -tractive effort of front and rear wheels; Pfl, PG - power of rolling resistance of front and rear wheels respectively; RZ1, RZ2 - vertical soil reactions to front and rear wheels respectively; Ph - hook power; G - vehicle gravity; a, b, L, h, h1 - geometric dimensions of the vehicle.
The above configuration of the dynamic model of a vehicle with a differential drive is the most general case. Other types of drive can be described using the same model with some refinements.
The developed dynamic model of the vehicle is distinguished by a certain novelty and reflects the behavior of all links in the dynamic system.
The mathematical model developed in accordance with the dynamic model allows modeling the movement of a vehicle equipped with a differential, blocked, or differential drive with a limited gear ratio in a variety of road conditions and can be used for comparative analysis of vehicle spin losses equipped with different types of drive.
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UZBEKISTAN | www.caajsr.uz
CENTRAL ASIAN ACADEMIC JOURNAL OF SCIENTIFIC RESEARCH
ISSN: 2181-2489 VOLUME 2 I ISSUE 5 I 2022
Scientific Journal Impact Factor (SJIF 2022=4.63) Passport: http://sjifactor.com/passport.php?id=2223Q
REFERENCES
1. A.V. Keller, G.D. Dragunov, Automotive industry, 1 (2004)
2. G.V. Novikov, V.V. Pogorelov, G.B. Shipilevsky, Automotive industry, 8 (2007).
3. I.V. Grinchenko, Investigation of the loading of transmissions of a multi-drive car while driving along a curvilinear trajectory, Diss. PhD. Moscow, (1976)
4. A.Kh. Lefarov, M.S. Vysotsky, V.V. Vantsevich, V.I. Kabanov, Energy loading and reliability of differential mechanisms of transport-traction machines, (Navuka i tehnika, Minsk, 1991)
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