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.

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.

Calculation of Wobble From Lead Inspection Data of Gear Teeth With Modifications

1998 ◽  
Author(s):  
Xiaogen Su ◽  
Donald R. Houser
Keyword(s):  
Satisfactory Result ◽  
Spur Gear ◽  
Helical Gear ◽  
Spur Gears ◽  
Helical Gears ◽  
Gear Teeth ◽  
Inspection Data

Abstract The effect of the reference misalignment including eccentricity and wobble on profile and lead inspection traces is discussed. The relative slopes of the lead traces induced by wobble are used to calculate the magnitude of the wobble. The deviation caused by the wobble is removed from the lead inspection results. This method is theoretically ‘exact’ for spur gears and is approximate for helical gears. Real measurement examples show this method produces a good result with a spur gear and a satisfactory result with a helical gear.

Contact Stress Evaluation of Involute Gear Pairs, Including the Effects of Friction and Helix Angle

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Santosh S. Patil ◽  
Saravanan Karuppanan ◽  
Ivana Atanasovska
Keyword(s):  
Finite Element ◽  
Friction Factor ◽  
Contact Stress ◽  
Three Dimensional ◽  
Helix Angle ◽  
Spur Gear ◽  
Helical Gear ◽  
Contact Stresses ◽  
Fe Model ◽  
3D Finite Element Method

The aim of this technical brief is to provide a new viewpoint of friction factor for contact stress calculations of gears. The idea of friction factor has been coined, for the calculation of contact stresses along the tooth contact for different helical gear pairs. Friction factors were developed by evaluating contact stresses with and without friction for different gear pairs. In this paper, three-dimensional (3D) finite element method (FEM) and Lagrange multiplier algorithm have been used to evaluate the contact stresses. Initially, a spur gear finite element (FE) model was validated with the theoretical analysis under frictionless condition, which is based on Hertz's contact theory. Then, similar FE models were constructed for 5 deg, 15 deg, 25 deg, and 35 deg helical gear pairs. The contact stresses of these models were evaluated for different coefficients of friction. These results were employed for the development of friction factor.

A New Continuous Contact Low-Noise Gear Pump

1983 ◽  
Vol 105 (4) ◽  
pp. 736-741 ◽  
Author(s):  
K. Mitome ◽  
K. Seki
Keyword(s):  
Point Contact ◽  
Practical Method ◽  
Spur Gear ◽  
Helical Gear ◽  
Low Noise ◽  
Tooth Profile ◽  
Gear Pump ◽  
Excellent Performance ◽  
Continuous Contact ◽  
Gear Pumps

Developed is a new low-noise gear pump which has no trapping and whose gears are in continuous one-point contact in the plane of rotation. First this paper studies a practical method to design the tooth profile of a spur gear for a given path of contact. A new tooth profile is obtained by giving a closed path of contact like a figure 8. Basic dimensions are determined and limites of them are obtained. Both theoretical and approximate displacements are expressed in terms of the basic dimensions. Secondly, a helical gear pump is studied. The helical gear can be discussed in the same way as the spur gear by new basic dimensions. Finally some test gear pumps are made and tested. Test prove that this gear pump has excellent performance and durability.

scholarly journals Contact stress in helical bevel gears

2021 ◽  
Vol 49 (3) ◽  
pp. 519-533
Author(s):  
Edward Osakue ◽  
Lucky Anetor ◽  
Kendall Harris
Keyword(s):  
Contact Stress ◽  
Helix Angle ◽  
Spur Gear ◽  
Helical Gear ◽  
Design Parameters ◽  
Bevel Gears ◽  
Capacity Model ◽  
Previous Solution ◽  
The Common ◽  
Spiral Angle

Helical bevel gears have inclined or twisted teeth on a conical surface and the common types are skew, spiral, zerol, and hypoid bevel gears. However, this study does not include hypoid bevel gears. Due to the geometric complexities of bevel gears, commonly used methods in their design are based on the concept of equivalent or virtual spur gear. The approach in this paper is based on the following assumptions, a) the helix angle of helical bevel gears is equal to mean spiral angle, b) the pitch diameter at the backend is defined as that of a helical gear, and c) the Tredgold's approximation is applied to the helical gear. Upon these premises, the contact stress capacity of helical bevel gears is formulated in explicit design parameters. The new contact stress capacity model is used to estimate the contact stress in three gear systems for three application examples and compared with previous solutions. Differences between the new estimated results and the previous solutions vary from -3% and -11%, with the new estimates being consistently but marginally or slightly lower than the previous solution values. Though the differences appear to be small, they are significant because the durability of gears is strongly influenced by the contact stress. For example, a 5% reduction in contact stress may result in almost 50% increase in durability in some steel materials. The equations developed do not apply to bevel crown gears.

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