scholarly journals Application of Open-die Warm Extrusion Technique in Spur Gear Manufacturing

2018 ◽  
Author(s):  
Wei Wang ◽  
Jun Zhao
Keyword(s):  
Spur Gear ◽  
Gear Manufacturing ◽  
Warm Extrusion

Multiple Reprocessing of Gear Using Recycled Polypropylene

2014 ◽  
Vol 660 ◽  
pp. 204-208
Author(s):  
Nik Mizamzul Mehat ◽  
Amirul Aliff Jamaludin ◽  
Shahrul Kamaruddin
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Tensile Properties ◽  
Spur Gear ◽  
Spur Gears ◽  
Elongation At Break ◽  
Recycled Polypropylene ◽  
Gear Manufacturing ◽  
Multiple Processing ◽  
Satisfactory Quality

The reprocessing ability of recycled polypropylene (PP) has been investigated to evaluate the recycling feasibility in spur gear production. Up to 15 reprocessing cycles have been performed by injection moulding, and the effects on tensile properties including ultimate tensile strength, Young’s modulus and elongation at break have been studied. Results revealed that reprocessing ability of recycled PP spur gears could yield satisfactory quality as attractive as that corresponding to the virgin PP spur gear. The recycled PP gears resulted in more 10% variation in tensile properties during multiple processing. This effort might be a contribution to convince the industry to apply recycling of PP by means of multiple reprocessing in gear manufacturing.

Research on Hobbing Process Principles and Linkage Models for Higher-Order Elliptic Gear

2012 ◽  
Vol 479-481 ◽  
pp. 2343-2346 ◽  
Author(s):  
You Yu Liu ◽  
Jiang Han ◽  
Gou Zheng Zhang
Keyword(s):  
Spur Gear ◽  
Helical Gear ◽  
Higher Order ◽  
Cnc System ◽  
Gear Manufacturing ◽  
Linkage Models ◽  
Manufacturing Problems ◽  
Theory Foundation

To solve higher-order elliptic gear manufacturing problems, this paper researches the pitch curves of higher-order elliptic gear and its transmission features, and creates the judgment method whether hobbing process can be applied. The four-axle three-linkage hobbing model for spur gear and the four-axle four-linkage hobbing model for helical gear are built by using tools (inclined) rack based on four-axle linkage strategy. This work provided the theory foundation for the manufacturing modular of higher-order elliptic gear in CNC System.

Analysis Of Tip Relief Profiles For Involute Spur Gears

2021 ◽  
Author(s):  
Jakab Molnar ◽  
Attila Csoban ◽  
Peter T. Zwierczyk
Keyword(s):  
Heat Treatment ◽  
Contact Stress ◽  
Planning Process ◽  
Spur Gear ◽  
Spur Gears ◽  
Cad System ◽  
Gear Manufacturing ◽  
Gear Contact ◽  
Gear Rack ◽  
Gear Profile

The main goal of this research was to study the influence of involute spur gear tip relief on the contact stress at the engagement meshing point (the begining point of the line of contact A). Different predefined involute spur gears and modification parameters (amount and length of modification) were already available from previous studies (Schmidt 2019). In this study, both the drive and the driven gear has tip relief. The modification of the gear profile was achieved through the modification of the gear rack cutter’s profile. This way the profil modification of the gear profiles are generated during the gear generation (gear planning) process. The gears have been nitrided, so after the gear manufacturing process, the heat treatment did not defrom the modified gear profile. The gear modifications were generated in a CAD system, and the calculations were made with FEM. The results show that the tip relief influences the magnitude of the gear contact stress at the first meshig point. With the use of tip relief modification, the contact stress of the meshing gears can be reduced at the beginning of the meshing line.

Application Of Shainin Methodology To Reduce Rejections In Spur Gear Manufacturing

2018 ◽  
Vol 5 (5) ◽  
pp. 12003-12008 ◽  
Author(s):  
Rajendra Khavekar ◽  
Hari Vasudevan ◽  
Girish Deshpande
Keyword(s):  
Spur Gear ◽  
Gear Manufacturing

A forming technology of spur gear by warm extrusion and the defects control

2016 ◽  
Vol 21 ◽  
pp. 30-38 ◽  
Author(s):  
Wei Wang ◽  
Jun Zhao ◽  
Ruixue Zhai
Keyword(s):  
Spur Gear ◽  
Forming Technology ◽  
Warm Extrusion

scholarly journals Design and Analysis of Spur Gear Using Composite Material

2021 ◽  
pp. 504-538
Author(s):  
Akshar Viruppan R R ◽  
Athiyaman S K ◽  
Deepak Kumar M ◽  
Gokul Ram D
Keyword(s):  
Composite Material ◽  
Power Transmission ◽  
Weight Ratio ◽  
Spur Gear ◽  
Stir Casting ◽  
Spur Gears ◽  
Improve Performance ◽  
Element Analysis ◽  
Gear Teeth ◽  
Gear Manufacturing

Spur gears are the simplest and widely used in power transmission. In recent years it is required to operate machines at varying load and speed. Gear teeth normally fail when load is increased above certain limit. Therefore, it is required to explore alternate materials for gear manufacturing. Composite materials provide adequate strength with weight reduction and they have emerged as a better alternative for replacing metallic gears. Composites provide much improved mechanical properties such as better strength to weight ratio, more hardness, and hence less chances of failure. So, this work is concerned with replacing metallic gear with composite material to improve performance of machine and to have longer working life. Efforts have also been carried out for modeling using 3D modelling software called SOLIDWORKS and finite element analysis of gears using ANSYS. Composite gears have been manufactured by stir casting, which is economical method. Composite gears offer improved properties over steel alloys and these can be used as better alternative for replacing metallic gears.

Design of High Speed Gears, Low Load Gears for Minimizing Gear Whine Noise

2013 ◽  
Author(s):  
Rodney Glover
Keyword(s):  
High Speed ◽  
Sliding Friction ◽  
Transmission Error ◽  
Spur Gear ◽  
Low Noise ◽  
Spur Gears ◽  
Contact Ratio ◽  
Low Load ◽  
Gear Manufacturing ◽  
The Cost

The main purpose of the supercharger timing gears is to keep the rotors from contacting each other. They are often lightly loaded and designed for low noise. As timing gears, they have by definition a ratio of 1.0. Furthermore, the timing gears are presently spur gears due to the cost of assembling helical gears onto the rotor shafts without allowing timing errors between the rotors. The original timing gear designs were spur gears with contact ratios slightly above 2.0. A major NVH issue has been gear whine noise, because most applications are in luxury vehicles and are evaluated with the hood open and the engine at idle. In this operating condition, the background noise is very low and any tonal gear whine noise is audible. The first effort was to push the gear manufacturing quality to the limits of modern grinding capability. In order to further reduce gear whine noise, the designs have evolved to finer pitch gearing with a contact ratio over 3.0 to reduce transmission error. Micro-geometries were optimized for low transmission error (TE) at low load. OSU Gear Lab’s RMC and LDP became primary tools in optimizing the gear designs for minimum TE. An important factor when increasing the contact ratio is to not increase the sliding friction significantly to keep the fixed oil sump temperature from increasing too much and cause wear issues in operation. Typically, the new high contact ratio spur gear designs in production have reduced the gear whine levels by more than 6 dB and have had very few noise complaints.

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