Tooth Profile Generation of Point-Contact Involute Planetary Gear Drive with Small Teeth Difference

2013 ◽  
Vol 441 ◽  
pp. 561-567 ◽  
Author(s):  
Wen Cui Yi ◽  
Bao Ying Wang ◽  
Shu He
Keyword(s):  
Three Dimensional ◽  
Point Contact ◽  
Planetary Gear ◽  
Smooth Curve ◽  
Tooth Surface ◽  
Three Dimensional Model ◽  
Gear Drive ◽  
Tooth Surfaces ◽  
Meshing Characteristics ◽  
Internal Gear

A new kind of involute planetary gear drive with small teeth difference which meshes in point contact is put forward based on the kinematic method of gear geometry in this paper. The generation principle of tubular tooth surface is proposed according to a selected smooth curve attached to the planetary wheel tooth surface. The general equations of conjugate tooth surfaces are derived and its conjugated contact curve on the internal gear is also determined. Then the mathematical model is established. The parameter selection and meshing characteristics of point-contact involute planetary gear drive with small teeth difference are discussed respectively. The three dimensional model is finally established and its motion simulation is worked out. It lays the significant theoretical foundation and practical meaning for improving the gear transmission performance.

Surface design and tooth contact analysis of an innovative modified spur gear with crowned teeth

2005 ◽  
Vol 219 (2) ◽  
pp. 193-207 ◽  
Author(s):  
J-L Li ◽  
S-T Chiou
Keyword(s):  
Gear Tooth ◽  
Point Contact ◽  
Spur Gear ◽  
Contact Analysis ◽  
Tooth Surface ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Surface Design ◽  
Tooth Surfaces ◽  
Meshing Characteristics

An innovative modified spur gear with crowned teeth and its generating mechanism are proposed in this study. The main purpose of tooth surface modification is to change line contact to point contact at the middle of gear tooth surfaces in order to avoid edge contact resulting from possible unavoidable axial misalignment. Moreover, the surface of one gear tooth can be generated with just one cutting process, thereby facilitating easy manufacturing. Based on gearing theory, the model for surface design is developed. A tooth contact analysis (TCA) model for the modified gear pair is also built to investigate meshing characteristics, so that transmission errors (TEs) under assembly errors can also be studied. Examples are included to verify the correctness of the models developed and to demonstrate gear characteristics.

Small Tooth Number Difference Planetary Gear Drive with a Crank and Oscillating Block Inputting Mechanism

2011 ◽  
Vol 52-54 ◽  
pp. 1268-1273 ◽  
Author(s):  
Jian Kun Cui
Keyword(s):  
Potential Application ◽  
Planetary Gear ◽  
Transmission Mechanism ◽  
Gear Pair ◽  
Gear Drive ◽  
Small Tooth ◽  
Tooth Number ◽  
New Type ◽  
Internal Gear ◽  
Block Mechanism

A new mechanism construction for small tooth number difference planetary gear drive is developed in which the planet wheel is guided by a planar crank and oscillating block mechanism. The sizes of linkage are design dexterously to get an approximate circumference linkage curve so that the engaging condition of internal gear pair can be satisfied. The trajectory of the inner gear center motion is analyzed and its error comparing with a standard circle is calculated to avoid movement interference. The movement of inner gear is study particularly to deduced formula of instantaneous transmission ratio. Despite observable fluctuation of output speed, this new type of gear transmission mechanism still has potential application value in situation with large ratio and low input speed. A hand drive winch prototype using the mechanism is also illustrated in this paper.

The Parameters Optimization of Bionic Tongue Block Based on the Discrete Element Method

2014 ◽  
Vol 926-930 ◽  
pp. 3298-3301
Author(s):  
Li Chen ◽  
Yong Hai Sun ◽  
Yang Liu
Keyword(s):  
Discrete Element Method ◽  
Complex Structure ◽  
Three Dimensional ◽  
Discrete Element ◽  
Parameters Optimization ◽  
Tooth Surface ◽  
Geometrical Parameters ◽  
Three Dimensional Model ◽  
Human Tongue ◽  
Element Method

Human tongue has complex structure and involves in chewing function, such as transporting and mixing foods. In order to develop tongue block of the bionic chewing equipment to make the food materials slide from the lingual surface to the tooth surface as much as possible in the same time, three-dimensional model of tongue block was built according to the geometric shape and physiology characteristic of the human tongue. The discrete element method was used to simulate the whole delivery process of food materials to teeth area, and then the geometrical parameters of the tongue block were optimized. The simulated results showed that when the height of the tongue tip and the tongue root were fixed, the optimal slope angles which have the decisive effect on the process of food materials slide were 32°and 2° respectively. The results provided a theoretical basis for the processing of tongue block of the bionic chewing equipment.

Geometric design and analysis of gear transmission with double circular arc-involute tooth profile

2015 ◽  
Vol 231 (11) ◽  
pp. 2100-2109 ◽  
Author(s):  
Dong Liang ◽  
Bingkui Chen ◽  
Rulong Tan ◽  
Ruijin Liao
Keyword(s):  
Transmission Efficiency ◽  
Tooth Profile ◽  
Gear Transmission ◽  
Motion Simulation ◽  
Circular Arc ◽  
Gear Drive ◽  
Tooth Surfaces ◽  
New Type ◽  
Gear Geometry ◽  
Meshing Characteristics

A novel gear transmission with double circular arc-involute tooth profile is studied in this paper. The generation principle and mathematical models of this proposed gear drive are provided based on gear geometry. The meshing characteristics of tooth surfaces are evaluated according to the analyses of motion simulation, mechanics property and sliding coefficient. The transmission efficiency experiment is based on the developed gear prototype, and a comparison with an involute gear drive is presented. The further study on dynamics analysis and key manufacturing technology will be conducted, and this new type of gear drive is expected to have excellent transmission performance.

Simulation Analysis of Planetary Gears Train of Semi-Direct Drive Wind Turbine Based on ADAMS

2015 ◽  
Vol 789-790 ◽  
pp. 311-315 ◽  
Author(s):  
Yan Li Cheng ◽  
Zheng Ming Xiao ◽  
Li Rong Huan ◽  
Fu Chen
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Planetary Gear ◽  
Gear System ◽  
Direct Drive ◽  
Three Dimensional Model ◽  
Velocity Change ◽  
Planetary Gears

The speed increasing gearbox is the key part of the wind turbine and its role is to transmit power which is generated by wind turbines to the generator through the gear system. The single-stage planetary gears train system is commonly used in the semi-direct drive wind turbines. In this paper Pro/E is used to establish the three-dimensional model of the speed increasing planetary gear system of the semi-direct drive wind turbine. Motion pairs, drive and load of the model are added by ADAMS. Angular velocity change rule of the parts is obtained. The change rules of the mesh force of the planetary gears, ring and sun gear can be obtained through the dynamic simulation and analysis using the contact algorithm. These are useful to study the vibration and noise of the system.

Research on Meshing Characteristics for Face Gear with Arcuate Tooth

2011 ◽  
Vol 86 ◽  
pp. 39-42
Author(s):  
Xiang Wei Cai ◽  
Zong De Fang ◽  
Jin Zhan Su
Keyword(s):  
Contact Analysis ◽  
Tooth Surface ◽  
Face Gear ◽  
Tooth Contact Analysis ◽  
Surface Equation ◽  
Transmission Errors ◽  
Gear Drive ◽  
Parabolic Function ◽  
The Face ◽  
Meshing Characteristics

The generating of face gear with arcuate tooth has been proposed in this paper, and the meshing characteristics are investigated. Based on the concept of imaginary gear cutter, tooth surface equation has been derived, flank modification has also been considered. The transmission errors and bearing contacts of the face gear drive with arcuate tooth under different assembly conditions are investigated by applying the tooth contact analysis. The numerical results reveal that the bearing contacts are not sensitive to the errors of misalignments, and a more favorable type parabolic function of transmission errors with better symmetry and reduced amplitude may be obtained according to the modification of the face gear.

Numerical Simulation of Gear Shaping for Planetary Gear Based on the MASTA Software

2013 ◽  
Vol 404 ◽  
pp. 307-311
Author(s):  
Lai Hua Yi
Keyword(s):  
Gear Tooth ◽  
Three Dimensional ◽  
Planetary Gear ◽  
Tooth Surface ◽  
Shaping Process ◽  
Single Tooth ◽  
Simulation Results ◽  
Pitch Deviation ◽  
The Right ◽  
Gear Shaping

In this paper, the gear shaping of some planetary gear was simulated. The simulation results show that via the gear shaping process, the gear tooth surface on the left has a single tooth pitch deviation of about 1.2 um, and the gear tooth surface on the right has a pitch deviation of 1.1 um, accordingly. By combining the simulation of two-dimensional and three-dimensional gear shaping models, this paper can not only realize accurately the gear shaping process of the planetary gear, but also provide some certain reference for the gear shaping processing.

Research on Curvature of Tooth Flank of Gleason Spiral Bevel Gears

2011 ◽  
Vol 189-193 ◽  
pp. 4256-4260
Author(s):  
Ai Mei Zhang ◽  
Lin Yan Li ◽  
Da Wei Li
Keyword(s):  
Mean Curvature ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Processing Parameters ◽  
Bevel Gear ◽  
Machining Process ◽  
Tooth Surface ◽  
Spiral Bevel Gear ◽  
Tooth Surfaces ◽  
Spiral Bevel

According to spiral bevel gear machining process, use the method of computer simulation to get the discrete points’ three-dimensional coordinates of Gleason spiral bevel gear tooth surface, and then solve the tooth surfaces’ NURBS surface as the unified mathematical model. On this basis, research the curvature of tooth surfaces of various types of Gleason spiral bevel gear, draw the mean curvature diagram, and study the link between the adjustment of processing parameters and the change of tooth surfaces’ mean curvature. Establish a theoretical foundation for the processing error adjustment based on tooth surface’s curvature diagram.

Design and Co-Simulation Analysis of Flip Climbing Transmission System for Stair-Climbing Wheelchair

2014 ◽  
Vol 621 ◽  
pp. 372-377
Author(s):  
Zhan Li Wang ◽  
Yan Juan Hu ◽  
Yan Wei Chen ◽  
Hua Chao Guo
Keyword(s):  
Simulation Analysis ◽  
Gear Tooth ◽  
Three Dimensional ◽  
Planetary Gear ◽  
Transmission System ◽  
Structure Design ◽  
Stair Climbing ◽  
Three Dimensional Model ◽  
Space Limitation ◽  
Simulated Analysis

: In this paper, I designed a differential planetary gear for flip climbing transmission system which was applied to the star-climbing wheelchair. According to space limitation and the stair climbing per formance requirements, distributing the number of teeth for each gear under transmission ratio requirements. Furthermore, modifying tooth profile parameters on each gear for improving the quality of the transmission. Using SolidWorks software established t he three-dimensional model. Then impact and contact simulated analysis is studied based on the SolidWorks Motion Plugins to get transmission and meshing condition. At the same time, gave the SolidWorks Motion output data as a result of the input data to t h e SolidWorks Simulation. Through the simulation results validate the output center gear tooth can meet the carrying capacity requirements. On the other hand, it also provides theoretical basis for further improve the structure design.

New developments in the design and generation of gear drives

2001 ◽  
Vol 215 (7) ◽  
pp. 747-757 ◽  
Author(s):  
F. L. Litvin ◽  
A Fuentes ◽  
A Demenego ◽  
D Vecchiato ◽  
Q Fan
Keyword(s):  
Point Contact ◽  
Tooth Surface ◽  
Helical Gears ◽  
Transmission Errors ◽  
Bevel Gears ◽  
Bearing Contact ◽  
Analysis And Synthesis ◽  
Tooth Surfaces ◽  
Design Generation ◽  
Gear Drives

Design, generation and simulation of the meshing and contact of gear drives with favourable bearing contact and reduced noise are considered. The proposed approach is based on replacement of the instantaneous line of contact of tooth surfaces by point contact and on application of a predesigned parabolic function of transmission errors that is able to absorb linear discontinuous functions of transmission errors caused by misalignment. Basic algorithms for analysis and synthesis of gear drives are presented. The developed theory is applied for design and generation of the following gear drives with modified geometry: (a) spur and helical gears, (b) a new version of Novikov-Wildhaber (N-W) helical gears, (c) asymmetric face gear drives with a spur pinion, (d) formate-cut spiral bevel gears. Generation of the tooth surface of a worm gear is presented as the formation of a two-branch envelope. The discussed topics are illustrated with examples.

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