Design and Optimization of Spur Gear Box Parameters

This review paper gives the information about design analysis of spur gears by comparing analytical results to calculate results. Thus this review paper mainly contributes to the modification had done in spur gear for better results. Many authors have used different approaches the goal they were working on. Stress and gear failure are mainly found using FEA and AGAMA standards. This review paper consist modification, use of software in design analysis, and analytical methods for the spur gears

New perspectives such as harmonic mean, contact patch as translating third body, contact form factor, and service load factor are introduced in spur gear design. The harmonic mean rule characterizes the physical and geometric properties of the contact patch. The contact patch is construed as a body in translation during gear teeth engagement. The contact form factor may be used to compare the load capability of different pressure angle standards. The service load factor captures the influence of different conventional rated load modification factors. Gear design analysis is separated into design sizing and design verification tasks. Design sizing and design verification formulas are formulated and presented in simplified forms for the Hertz contact and the Lewis root bending stresses. Three design Examples are presented through which it is demonstrated that results from the contact and root bending stress capacity models compare very favorably with American Gear Manufacturers Association (AGMA) results. The worst differences in the results are 5.23% for contact stress in design Example 2 and -6.59% for root bending stress for design Example 1. In design Example 3, it is shown that using pinion teeth number higher than 17 or 18 can leads to overall size reduction of gearset. This is important because of possible manufacturing cost reduction and higher mesh efficiency. Comparison of proposed approximations for mesh overload, internal overload and service load factors for design sizing and design verification tasks yielded very close results. The highest variance in the three design examples between proposed approximated and AGMA values of these parameters is -5.32%, indicating a slightly higher or conservative value for design sizing. Due to the very favorable results in comparison with AGMA values, the design approach appears to be an acceptable one in the preliminary design of spur gears because of simplicity and transparency.

International Journal of Advance Research and Innovative Ideas in Education, 2019

Gears are commonly used for transmitting motion and power. In precision machines , in which a definite velocity ratio is of importance, the only positive drive is by means ofgeara or toothed wheels..They develop high stress concentration at the root and the point of contact. The repeated stressing on the fillets causes the fatigue failure of gear tooth. The main objective of this study is to add different shaped holes to reduce stress concentration. A finite element model of Spur gear with a segment of three teeth is considered for analysis and stress concentration reducing holes of various sizes are introduced on gear teeth at various locations. Analysis revealed that aero-fin shaped hole introduced along the stress flow direction yielded better results…

Present paper covers the design,modal analysis and results of experimental tests of spur gear.Effort is to increase the fundamental frequencies of existing gear and to improve performance of existing gear without compromising on the performance.Result of FEM analysis is compared with the experimental result and analytical results.

International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2023

Gear roll tester is used to measure and analyse accuracy and errors in spur gears. Gear testing is a technique that has been used in the gear industry to identify possible manufacturing defects in the design of the gear. It is a practical, fast, and effective screening tool that can identify when the gear manufacturing process has deviated from an targeted condition. Therefore, in the present paper it was decided to develop a gear roll tester to analyse effects of different types of defects in gear on its functional performance like run out, misalignments, profile errors, noise, vibration ,pitch errors and

Gears play major role in the transmission of mechanical power. The analysis of spur gear is carried out based on load distribution factor. The bending and contact stresses are considered as the cause of failure on spur gear. The detailed study on modes of failure is made. The load factor is calculated with various angular arrangements. The analysis is carried out with and without considering the external factors. The mathematical model is analyzed with Finite Element Analysis (FEA) and compared with the analytical procedure and the percentage error is calculated.

ANNALS OF THE ORADEA UNIVERSITY. Fascicle of Management and Technological Engineering., 2010

The paper highlights the way the geometrical parameters of the gear influence its efficiency. This aspect enables the optimisation of the design calculation in view of obtaining a highly-efficient gear. The following parameters are highlighted: the number of teeth of the pinion, the module, the gear ratio, the spur addendum, the friction coefficient, the mesh angle, the teeth correction.

2020

A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed path in order to transmit torque. Two or more gears working in tandem are used a transmission and can produce mechanical advantage through a gear ratio and thus may be considered a simple machine. Geared devices can change the speed, torque, find direction of a power source. Gears can be grouped according to their usage types like spur, bevel , worm etc. Spur gears are the most common type of gears. They have straight teeth and are mounted on parallel shafts. Sometimes, mini spur gears are used at once to create very large gear reductions. Spur gears are used in many devices like electric screwdriver, wind up alarm clock, washing machine and clothes dryer. Each time a gear tooth engages a tooth on the other gear, the teeth collide, and this impact makes a noise. It also increases the stress on the gear teeth. This can lead to many issues like increasing noise, vibrations and many types of de...

Problem : Design a spur gear drive as a speed reducer for a compressor running at N 1 = 400 RPM, driven by a single cylinder engine of a P = 25 kW and N 2 = 1600 RPM. The available minimum centre distance is C min = 400 mm. The pinion and gear to be made of different material.

Volume 8: 11th International Power Transmission and Gearing Conference; 13th International Conference on Advanced Vehicle and Tire Technologies, 2011

Aerospace applications require special procedures for component design and manufacturing. Spur gears of different designs, because of their simpler geometries, are used in vital units-transmissions of helicopters and alike aerospace vehicles. In this study, performances of various profile designs of previously researched low and high contact ratio spur gears with some realistic design parameters are studied. Effects of the realistic parameters of variable tooth pair stiffness, relief shape, and adjacent pitch error on Transmission Error (TE), tooth loads and root stresses are presented; composition of these parameters determines the efficiency of the gearbox assembly. Detail of minimization of tooth root stress through optimized/proper design of relief is described. More comprehensive comparison of the gear tooth profile design cases is done to be able to guide aerospace transmission designers for practical applications with realistic parameters for each of the design cases. A preference order is done among the design cases, depending on effect of some design parameters on the results such as tooth loads, tooth root stresses, TE curves and peak-to-peak TE values. NOMENCLATURE F transmitted load per unit facewidth, N/mm F d design load per unit facewidth, N/mm f normalized transmitted load f d normalized design load fopt normalized load at which smooth TE curve is obtained f t,max normalized maximum tooth load PE adjacent pitch error PL pivotal point of the double relief (see figure 1) TEpp peak-to-peak transmission error value ε α transverse contact ratio