Figure 1-7 Basic Geometry of Helical Gear  1.5 Advantages of Helical Gear The advantages of using Helical Gear over other types of gears is The angled teeth engage more gradually than do spur gear teeth causing them to run more smoothly and quietly Helical gears are highly durable and are ideal for high load applications. Helical gears can be used on non-parallel and even perpendicular shafts, and can carry higher loads than can spur gears. At any given time, their load is distributed over several teeth, resulting in less wear. Can transmit motion and power between either parallel or right-angle shafts.
1.6 Applications of Helical Gears The common application of helical gears are as follows The most common use for helical gears is in automotive transmissions. Helical gears are normally preferred to work under heavy load efficiently. Helical gears are used in fertilizer industries, Printing industries and earth moving industries. Helical gears are also used in steel, rolling mills, section rolling mills, power and port industries. Helical gears are also used in textile industries, plastic industries, food industries, conveyors, elevators, blowers, compressors, oil industries & cutters.
2 Literature Review There are great number of researches and literatures on gear analysis that has been published. Generally, their major concerns are on the analysis of gear stresses, transmission errors, dynamic loads, noise, and failure of gear tooth, which are very useful for optimal design of gear set. They have used various approaches and means to attain their main intention. 2.1 Reviewed literatures Malla Mahesh, Dr. S Ramakrishna (2018) has done work on “Design and analysis of helical gear in slag port transfer car gear box” The objective of the paper is to design and analyze the failure methods in helical gear which is related to slag transfer in the steel manufacturing industry. In the design the contact stress is considered to be one of the main factors to the failure of the gear. The analysis is done by varying the helix angle. For the analysis both the theoretical (AGMA) and FEM(ANSYS) is used. Finally, the results obtained from ANSYS values are compared with theoretical values are in close agreement.  Ms.Sonali A Mote, Prof. A.V Gaur et.al (2018) has done work on “Design and FEM Analysis of Helical Gear”. The objective of this paper was to resolve problem of speed reduction gearbox developed by Laxmi Hydraulic Pump (LHP) Pvt Ltd. The failure of gear in speed reduction gearbox developed by Laxmi Hydraulic Pump (LHP) Pvt Ltd, Solapur is resolved by replacing the existing material by a material SAE8620. In the gear design, the bending stress and surface strength of the gear tooth are considered to be one of the main factors to the failure of the gear. In this paper bending and contact stresses are calculated by using analytical method as well as Finite Element Method. To estimate bending stress modified Lewis beam strength method is used as well as AGMA method. From the results it is seen that the maximum error is 5%. 
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- Fall '19
- Msc. Amar Yemim
- gear, helical gear