Influence of Centrodes Coefficient on the Characteristic of Gear Ratio Function of the Compound Non-circular Gear Train with Improved Cycloid Tooth Profile

2021 ◽  
pp. 204-214
Author(s):  
Nguyen Hong Thai ◽  
Phung Van Thom ◽  
Nguyen Thanh Trung
Keyword(s):  
Gear Ratio ◽  
Tooth Profile ◽  
Gear Train

Modeling, Validation, and Investigation of an Electrohydraulic Crimping Hand Tool

2019 ◽  
Author(s):  
Eric D. Norquist ◽  
Jonathon E. Slightam ◽  
Mark L. Nagurka
Keyword(s):  
Energy Consumption ◽  
Maximum Energy ◽  
Gear Ratio ◽  
Gear Train ◽  
Lumped Parameter Model ◽  
Average Error ◽  
Hydraulic Systems ◽  
Human Scale ◽  
Hand Tool ◽  
Dependent Parameter

Abstract Due to their high power density, hydraulic systems are increasingly adapted for human scale devices. For example, commercial and utility electricians use electrohydraulic cutting and crimping tools, rather than human powered tools, to cut and crimp wires that exceed 25mm in diameter. These tools greatly reduce worker-related fatigue and strain-type injuries. To improve electrohydraulic tool technology, there is a need to increase the number of applications from a single battery charge. This paper develops a high fidelity nonlinear lumped parameter model of an electrohydraulic crimping hand tool used by professional electricians. The eleventh-order model can predict tool performance with an average error of 6.9% and 4.4% with respect to the maximum energy consumption and crimp time, respectively. Simulation studies were conducted to investigate reducing the energy consumption of the tool. An independent parameter sweep was performed on the pump piston diameter. The gear ratio was a dependent parameter linked through the maximum motor torque. Increasing the pump piston diameter while increasing the gear ratio was shown to decrease the energy consumption of the tool during crimping applications. Simulations suggest that up to 30% energy can be saved per crimp by increasing the pump piston diameter and gear train ratio.

scholarly journals Work of the planetary gear trains as differentials and their capabilities

2019 ◽  
Vol 287 ◽  
pp. 04001
Author(s):  
Kiril Arnaudov ◽  
Stefan Petrov ◽  
Emiliyan Hristov
Keyword(s):  
Degrees Of Freedom ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Gear Train ◽  
Motor Drive ◽  
Planetary Gear Train ◽  
Maximum Security ◽  
Single Carrier ◽  
Planetary Gear Trains ◽  
Gear Trains

Planetary gear trains can work differently, namely, with F=1 degree of freedom, i.e. as reducers or multipliers, and also with F=2 degrees of freedom, i.e. as differentials. Moreover, with a two-motor drive they work as a summation planetary gear train and with a one-motor drive, they work as a division planetary gear train. The most popular application of planetary gear trains is as a differential which is bevel and is produced globally in millions of pieces. Some of the cylindrical planetary gear trains can also be used as differentials. Although less often, they are used in heavy wheeled and chain vehicles such as trailer trucks, tractors and tanks. They are also very suitable for lifting machines with a two-motor drive which provides maximum security for the most responsible cranes, such as the metallurgical ones. Initially the paper presents some simple, i.e. single-carrier cylindrical planetary gear trains, both with external and internal meshing, driven by 2 motors. Their kinematic capabilities and velocity, respectively, are considered to realize the necessary gear ratio. Finally, the case of a compound two-carrier planetary gear train is considered, which is composed of 2 simple planetary gear trains. This shows that not only the simple planetary gear trains, i.e. the single-carrier ones, can work as differentials.

A PLANETARY GEAR TRAIN WITH RING-INVOLUTE TOOTH

2008 ◽  
Vol 32 (2) ◽  
pp. 251-266
Author(s):  
Shyue-Cheng Yang ◽  
Tsang-Lang Liang
Keyword(s):  
Planetary Gear ◽  
Conjugate Problem ◽  
Gear Ratio ◽  
Gear Train ◽  
Tooth Surface ◽  
The Sun ◽  
Ring Gear ◽  
Planetary Gear Train ◽  
Envelope Method ◽  
Planet Gear

This paper proposes a planetary gear train with ring-involute tooth profile. Inherent in a planetary gear train is the conjugate problem among the sun, the planet gears and the ring gear. The sun gear and the planet gear can be obtained by applying the envelope method to a one-parameter family of a conical tooth surface. The conical tooth rack cutter was presented in a previous paper [5]. The obtained planet gear then becomes the generating surface. The double envelope method can be used to obtain the envelope to the family of generating surfaces. Subsequently the profile of a ring gear of the planetary gear trains can be easily obtained, and using the generated planet gear and applying the gear theory, the ring gear is generated. To illustrate, the planetary gear train with a gear ratio of 24:10:7 is presented. Using rapid prototyping and manufacturing technology, a sun gear, four planet gears, and a ring gear are designed. The RP primitives provide an actual full-size physical model that can be analyzed and used for further development. Results from these mathematical models are applicable to the design of a planetary gear train.

Manufacturing of Cycloid Tooth Profile for RV and Cyclo Drives by Threaded Wheel Hobbing and Grinding

2019 ◽  
Vol 825 ◽  
pp. 106-113
Author(s):  
Ling Chiao Chang ◽  
S.J. Tsai ◽  
Jia Sheng Wei ◽  
Pin Ching Chen
Keyword(s):  
Planetary Gear ◽  
Gear Ratio ◽  
Tooth Profile ◽  
Grinding Wheel ◽  
Axial Section ◽  
Precision Motion ◽  
Gear Drives ◽  
Synthesis Approach

Cycloid planetary gear drives are widely used in power and precision motion transmission because of high gear-ratio and good shock absorbability. The aim of the paper is to propose a synthesis approach to generate necessary profiles for manufacturing with thread-wheel type tools based on a given cycloid tooth profile. Two different cases are illustrated in the paper to calculate these profiles, the profiles of thread wheel on normal or axial section, the equivalent rack profile, as well as the profile of dressing or grinding wheel for grinding or hobbing.

Development and Application of an Automatic Design System for Multi-Stage Gear Drives

2003 ◽  
Author(s):  
Inho Bae ◽  
Tae Hyong Chong ◽  
Aizoh Kubo
Keyword(s):  
Gear Ratio ◽  
Gear Train ◽  
Design System ◽  
Configuration Design ◽  
Design Algorithm ◽  
Multi Stage ◽  
Different Types ◽  
Gear Drives ◽  
Strength And Durability ◽  
Short Time

This paper presents a design algorithm to automate the preliminary design of multi-stage gear drives. Since the design of multi-stage gear drives includes both the dimensional design of gears and the configuration design of the gear train, it is necessary to integrate the design processes in a formalized algorithm in consideration of the highly coupled nature of them. The proposed algorithm begins with splitting gear ratio and dimensional design of the gear pairs on the criteria of strength and durability. Then, it proceeds with a configuration design to position gear drive elements in an available space while minimizing gearbox size and satisfying spatial constraints. The design algorithm has been validated through the redesign example of a geared motor reduction drive. The design has been carried out for six different types of methods according to the ratio splitting algorithms and objective function formulations. The results have been compared with each other and with the existing design. All the designs showed considerably good results: it takes very short time to obtain a solution and the gearbox size reduced considerably while the amounts of constraints violation converged to negligible level. The proposed design algorithm may be used effectively to reduce time and cost for the practical design of multi-stage gear drives.

Design of Planetary Gear Reducer with Double Circular-Arc Helical Gear

2012 ◽  
Vol 152-154 ◽  
pp. 1595-1600 ◽  
Author(s):  
Chin Yu Wang
Keyword(s):  
Convex Combination ◽  
Planetary Gear ◽  
Gear Ratio ◽  
Helical Gear ◽  
Tooth Profile ◽  
National Standard ◽  
Reduction Gear ◽  
Circular Arc ◽  
Pressure Angle ◽  
Minimum Number

The two gears of the double circular-arc helical gear is a mesh of a concave/convex combination. Because the curvature is close to each other, the strength also increased and thus, it is often used in heavily-loaded workplaces. The national standard for double circular-arc helical gear (ex., GB12759-91) is based on the size of the gear module to design its tooth profile. This shows that tooth geometric-related designs are quite complicated. If the effect of the different pressure angle parameter is considered, we would be unable to conduct relevant studies for the original standard formula with a double circular-arc helical gear set at a pressure angle of 24°. Firstly, this paper would redefine a new double circular-arc helical gear according to the discontinuousness tooth profile molded line of the double circular-arc helical gear and unchangeable pressure angle and explain the improvements in the design and stress analysis of the tooth especially since the double circular-arc helical gear has no limitation in the minimum number of teeth. Thus, the decrease in the driving gears’ number of module and can further increase the reduction gear ratio. For heavily-loaded planetary gear reducer, it’s quite obvious in the miniaturizing and high torque superiority. This paper also used certain winch’s speed reducer as example to explain that the change of the pressure angle can reduce contact stress by 3%~40% and also enhances the torque ability by 3%~40%.

scholarly journals GEOMETRIC SYNTHESIS OF INVOLUTE PLANETARY GEARS WITH CONNECTED GEAR WHEELS OF TYPE 2K-H

2021 ◽  
Vol 3 ◽  
pp. 49-53
Author(s):  
Genadi Cvetanov ◽  
Tsanko Karadzhov
Keyword(s):  
Optimization Method ◽  
Gear Ratio ◽  
Optimal Choice ◽  
Tooth Profile ◽  
Planetary Gears ◽  
Measuring Devices ◽  
Basic Law ◽  
Gear Wheels

Based on the basic law of flat interlocking, the paper considers a possibility of increasing the gear ratio of low module involute cylindrical planetary gears by using asymmetric tooth profile for the purposes of measuring devices. An example of the synthesis of such reduction gearing by optimal choice of asymmetry between the profiles and Possibility of generation III is presented.  Also presented is a planar matching of the unconditional existence areas in the field of independent coefficients of instrument displacement by the straight optimization method and pre-set qualitative indicators of the gearing.

Design of a non circular gear Mechanism with Twice Unequal Amplitude Transmission Ratio

2022 ◽  
pp. 1-13
Author(s):  
Jiangang Liu ◽  
Zhipeng Tong ◽  
Yu Gao-hong ◽  
Xiong Zhao ◽  
Haili Zhou
Keyword(s):  
High Speed ◽  
Planetary Gear ◽  
Tooth Profile ◽  
Gear Transmission ◽  
Gear Train ◽  
Transmission Ratio ◽  
High Speed Camera ◽  
Contact Ratio ◽  
Ratio Curve ◽  
Amplitude Transmission

Abstract This study proposes a new non–circular gear transmission mechanism with an involute–cycloid composite tooth profile to realize the twice unequal amplitude transmission (In a complete rotation cycle of gear transmission, instantaneous transmission ratio has twice fluctuations obvious with unequal amplitude) of non–circular gears. The twice unequal amplitude transmission ratio curve was designed based on Fourier and polynomial functions, the change law of the Fourier coefficient on the instantaneous transmission ratio(In non-circular gear transmission, the transmission ratio changes with time, and the transmission ratio of non-circular gear should be instantaneous transmission ratio) was analyzed, and the pressure angle and contact ratio of the involute–cycloid composite tooth profile was calculated. The involute–cycloid composite tooth profile non–circular gear was machined by WEDM technology, while its meshing experiment was performed using high-speed camera technology. The results demonstrate that the instantaneous transmission ratio curve value obtained via the high-speed camera experiment was consistent with the simulation value of virtual software. Furthermore, the involute–cycloid composite tooth profile was applied in the seedling pickup mechanism of non–circular gear planetary gear train. The possibility of the application of the involute–cycloid composite tooth profile in the seedling pickup mechanism was verified by comparing the consistency of the theoretical and simulated seedling picking trajectory.

The Grinding of the Worm for Worm Gear Set

2018 ◽  
Vol 775 ◽  
pp. 473-479
Author(s):  
Chi Hsiang Chen ◽  
Duy Hoang Nguyen ◽  
Shinn Liang Chang ◽  
Truong Giang Nguyen
Keyword(s):  
Gear Ratio ◽  
Tooth Profile ◽  
Worm Gear ◽  
Tooth Surface ◽  
Grinding Wheel ◽  
Essential Requirement ◽  
Straight Line ◽  
Worm Gears ◽  
Crossed Axes ◽  
Grinding Machine

Worm gear set is composed by the worm and worm wheel. It is an important transmission device for crossed axes transmission with high gear ratio. Worm gears can be produced in several ways, depending on the size of the transmission, the number of threads, the type of the worm and the purpose of application, etc. The contact is highly related to the precision of tooth profile. The best way to control the characteristic of contact is done by the modified worm profile. This paper deals with the manufacture of ZI-Worm whose theoretical tooth surface is generated by a screw motion of a straight line. In order to manufacture the worm with modified high precision tooth profile, the most important consideration is how to develop the profile of the grinding wheel in the worm grinding process. It is the essential requirement for the development of grinding machine for the worm. This article therefore deals with the problems of how to generate the profile of the grinding wheel. By the development of the grinding machine, we can complete the worm surface and tools for the production.

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