scholarly journals A Life Estimation Method of the Plastic Helical Gear and Spur Gear Pairs(Machine Elements and Manufacturing)

2009 ◽  
Vol 75 (755) ◽  
pp. 2068-2074 ◽  
Author(s):  
Mikio TAKAHASHI ◽  
Hideo TAKAHASHI ◽  
Tokihiko TAKI ◽  
Takao KOIDE
Keyword(s):  
Estimation Method ◽  
Spur Gear ◽  
Helical Gear ◽  
Life Estimation ◽  
Machine Elements

scholarly journals A Life Estimation Method of Helicopter Transmission System Key-parts

2018 ◽  
Vol 382 ◽  
pp. 052016
Author(s):  
Qing Mei ◽  
Tiancai Guo ◽  
Tongbo Xue ◽  
Hua Wen ◽  
Zhenrong Huang
Keyword(s):  
Estimation Method ◽  
Transmission System ◽  
Life Estimation ◽  
Helicopter Transmission

The Design and Prototype Manufacture of Helical Gear Reducers with Two Gear Pairs

2018 ◽  
Vol 883 ◽  
pp. 37-42 ◽  
Author(s):  
Tzu Hsia Chen ◽  
Long Chang Hsieh
Keyword(s):  
Electric Vehicles ◽  
Mechanical Efficiency ◽  
Spur Gear ◽  
Helical Gear ◽  
Engineering Drawings

Due to the reasons of manufacture cost and mechanical efficiency, the gear transmissions for electric vehicles are helical gear reducers. For electric vehicles, the reduction ratios are required to be 11~30 and their gear reducers are helical gear reducer with two gear pairs. This paper focused on the design and prototype manufacture of helical gear reducers with two gear pairs. First, according to the kinematic requirements of electric vehicles, their reduction ratios were derived. Then, based on the involute theorem, the gear data of helical spur gear pairs we obtained. Finally, according to the gear data, its corresponding engineering drawings were accomplished and its corresponding prototype was manufactured. The results of this paper can be used as reference for engineers to design the gear reducers for electric vehicles.

A Study on the Estimation Method of Meshing Teeth Temperature of Plastic Crossed Helical Gear

2017 ◽  
Vol 2017 (0) ◽  
pp. S1120105
Author(s):  
Yuya AOYAMA ◽  
Mikio TAKAHASHI ◽  
Hideo TAKAHASHI ◽  
Takayoshi ITAGAKI ◽  
Takao KOIDE
Keyword(s):  
Estimation Method ◽  
Helical Gear

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.

scholarly journals Application of computer technologies for calculation of gears at studying of a course " Details of machines"

2021 ◽  
pp. 15-20
Author(s):  
Olena Nadtoka ◽  
Denis Nadtoka
Keyword(s):  
Computer Program ◽  
Object Oriented ◽  
Spur Gear ◽  
Helical Gear ◽  
Bevel Gear ◽  
Object Oriented Programming ◽  
Transmission Parameters ◽  
Separate File ◽  
Machine Parts ◽  
Oriented Programming Language

The computer program GearKURT has been created to calculate mechanical gears. The program allows you to calculate gears: - closed cylindrical spur gear - closed cylindrical helical gear - open cylindrical spur gear - Novikov's gear - closed bevel spur gear - closed bevel gear with indirect teeth - open bevel gear - worm-gear. The computer program has a dialog interface written in the object-oriented programming language Delphi and compiled into an exe-file. The program allows you to choose the necessary material and method of heat treatment for the manufacture of gears, to calculate the optimal geometric dimensions and transmission parameters, to determine the design of gears. The program provides all the necessary reference materials in the form of tables and graphs, which must be used to select the coefficients and other values necessary for calculations. The program provides access to the theoretical material of the course "Machine Parts" and the ability to save the results of calculations in a separate file. Recommendations for using this program are given.

scholarly journals Structural analysis of non-standard geometric variants of a shifted spur gear

2021 ◽  
Vol 1199 (1) ◽  
pp. 012002
Author(s):  
K Konecki ◽  
D Wojtkowiak ◽  
K Talaśka ◽  
A Kołodziej ◽  
G Domek
Keyword(s):  
Structural Analysis ◽  
Spur Gear ◽  
Strength Properties ◽  
Helical Gear ◽  
Strength Analysis ◽  
Reconstruction Process ◽  
Industrial Practice ◽  
Second Stage ◽  
The Past ◽  
Machine Parts

Abstract Today's industrial practice shows that - in contrast to the past years, where gears were designed as standard as possible - machine parts are constructed on the basis of selecting non-standard parameters. This is because producers protect themselves against making additional parts from local suppliers for much less money by customers. The paper presents a geometric and strength analysis of an exemplary spur gear, which works as the second stage of a bevel-helical gear in the coiling mechanism of a multi-module machine producing bonell springs for mattresses. It was checked whether the transmission could be redesigned in such a way as to make its geometry as complicated as possible while maintaining the appropriate strength properties. Finally, there are graphs that can be helpful in this type of reconstruction process, and the subsequent stages of this work can be treated as a kind of algorithm for the discussed conversion of geometric parameters of the gear.

Fatigue Life Estimation for HFMI-Treated Weldments Considering Weld Toe Magnification Factors

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Dong-Yub Kim ◽  
Myung-Hyun Kim
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Estimation Method ◽  
Magnification Factor ◽  
Life Estimation ◽  
Positive Effects ◽  
Magnification Factors ◽  
Fatigue Life Estimation ◽  
Weld Toe ◽  
Explicit Consideration

Abstract High-frequency mechanical impact (HFMI) post-treatment is a proven method to improve the fatigue life of welded structures. The positive effects of HFMI treatment are influenced by the weld toe geometries and residual stresses. This study investigates the effect of geometric and mechanical improvements by HFMI treatment on fatigue strength with explicit consideration of the weld toe magnification factor. General fatigue life estimation method is based on experiment data, and residual stress may be considered in addition. In terms of HFMI-treated structures, geometric improvement also affects the fatigue life. Thus, a more efficient method is suggested by considering the weld toe magnification factor to assess the effects of HFMI treatment. First, the weld toe magnification factor in HFMI-treated conditions is calculated to consider the geometrical effect of HFMI treatment at the weld toe region. Second, a stress ratio model is introduced to consider the compressive residual stress by HFMI treatment based on the Paris equation. The results were validated by comparing them with the estimated fatigue life from previous studies on HFMI-treated welded specimens.

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