Center Distance Change of Silent Chain Drive Effect on Sprocket Tooth Profile Modification

2012 ◽  
Vol 522 ◽  
pp. 574-577
Author(s):  
Wei Sun ◽  
Xiao Lun Liu ◽  
Jia Jun Liu ◽  
Wei Zhang
Keyword(s):  
Tooth Profile ◽  
Chain Drive ◽  
Transmission Performance ◽  
Profile Modification ◽  
Actual Application ◽  
Profile Equation ◽  
Drive Effect ◽  
Chain Transmission ◽  
Chain Links ◽  
Center Distance

The principle of modified gear was applied to silent chain transmission, and tooth profile equation of the involute sprocket was derived, then method of processing gear using imaginary rack cutter solved modification coefficient of involute sprocket. When Center distance of silent chain drive changed smaller, processing method of sprocket modification coefficient and range of modification coefficient values were analysed. The method by changing the modification coefficient of involute sprocket solves the problem that the chain links are increased or decreased in the actual application to be unable to meet the requirements of specific center distance, thus improve transmission performance of silent chain.

scholarly journals A New Tooth Profile Modification Method of Cycloidal Gears in Precision Reducers for Robots

2020 ◽  
Vol 10 (4) ◽  
pp. 1266 ◽  
Author(s):  
Tianxing Li ◽  
Xiaotao An ◽  
Xiaozhong Deng ◽  
Jinfan Li ◽  
Yulong Li
Keyword(s):  
Tooth Profile ◽  
Machining Parameters ◽  
Angle Distribution ◽  
Profile Curve ◽  
Force Transmission ◽  
Transmission Performance ◽  
Profile Modification ◽  
Pressure Angle ◽  
Tooth Profile Modification ◽  
Modification Method

The tooth profile modification of cycloidal gears is important in the design and manufacture of precision reducers or rotary vector (RV) reducers for robots. The traditional modification design of cycloidal gears is mainly realized by setting various machining parameters, such as the size and center position of the grinding wheel. The traditional modification design has some disadvantages such as complex modification calculation, uncontrollable tooth profile curve shape and unstable meshing performance. Therefore, a new tooth profile modification method is proposed based on the consideration of the comprehensive influences of pressure angle distribution, meshing backlash, tooth tip and root clearance. Taking the pressure angle and modifications of tooth profile as the parameters of the modification function and the meshing backlash of gear teeth as constraints, the mathematical model for tooth profile modifications is built. The modifications are superimposed on the normal direction of the theoretical profile—the force transmission direction. The mathematical relationship between the modifications and the pressure angle distribution, which determines the force transmission performance, is established. Taking the straight line method, cycloid method and catenary method as examples, by means of the tooth contact analysis technology, the transmission error and minimum meshing backlash, which reflects the lost motion, of the newly modified profile are analyzed and verified. This proposed method can flexibly control the shape change of the modification profile and accurately pre-control the transmission accuracy of the cycloid-pin gear. It avoids the disadvantages of traditional modification methods, such as uncontrollable tooth profile shape and unstable meshing accuracy. The method allows good meshing characteristics, high force transmission performance and more precise tooth profile curve. The study provides a new design method of the modified profile of cycloidal gears.

Structural Optimization of a Chain Transmission with Constraints

2014 ◽  
Vol 687-691 ◽  
pp. 523-526
Author(s):  
Lin Hong ◽  
Xiao Juan Li
Keyword(s):  
Drive System ◽  
Compensation Method ◽  
Chain Drive ◽  
Transmission Performance ◽  
Effect Analysis ◽  
Trajectory Simulation ◽  
Chain Transmission ◽  
Simulation Results ◽  
A Chain ◽  
Main Factor

Polygon effect is the inherent characteristics of chain drive system, and also the main factor which restricts the transmission performance of the system. In this article a structure related to a slide constraint chain drive is presented and optimized by means of MATLAB optimization toolbox. Based on polygon effect analysis, a compensation method is proposed and verified by trajectory simulation. Simulation results show that the compensation method can effectively reduce the polygon effect of chain drive and improve the transmission performance of the chain drive system.

scholarly journals Computer-Aided Design of High-Contact-Ratio Gears for Minimum Dynamic Load and Stress

1993 ◽  
Vol 115 (1) ◽  
pp. 171-178 ◽  
Author(s):  
Hsiang Hsi Lin ◽  
Chinwai Lee ◽  
F. B. Oswald ◽  
D. P. Townsend
Keyword(s):  
Dynamic Load ◽  
Computer Aided Design ◽  
Numerical Procedure ◽  
Tooth Profile ◽  
Lower Sensitivity ◽  
Contact Ratio ◽  
Profile Modification ◽  
Parabolic Profile ◽  
Profile Design ◽  
Optimum Profile

This paper presents a numerical procedure for minimizing dynamic effects on high-contact-ratio gears by modification of the tooth profile. The paper examines and compares both linear and parabolic tooth profile modifications of high-contact-ratio gears under various loading conditions. The effects of the total amount of modification and the length of the modification zone were systematically studied at various loads and speeds to find the optimum profile design for minimizing the dynamic load and the tooth bending stress. Parabolic profile modification is preferred over linear profile modification for high-contact-ratio gears because of its lower sensitivity to manufacturing errors. For parabolic modification a greater amount of modification at the tooth tip and a longer modification zone are required. Design charts are presented for high-contact-ratio gears with various profile modifications operating under a range of loads. A procedure is illustrated for using the charts to find the optimum profile design.

CALCULATION OF THE CHAIN DRIVE OF A MECHANIZED CHAMBER-CHAIN DRYING PLANT FOR DRYING MELON FRUITS

2021 ◽  
Vol 4 (1) ◽  
pp. 29-35
Author(s):  
Nafisa Saidho’jaeva ◽  
Keyword(s):  
Heat Exchanger ◽  
Chain Drive ◽  
Utility Model ◽  
Load Bearing ◽  
Air Heater ◽  
Load Carrying ◽  
Chain Transmission ◽  
A Chain ◽  
Chain Conveyor

The article deals with the calculation of the drive and chain transmission of the newly created mechanized drying plant for drying melon slices. The essence of the utility model: the machine contains a horizontal tunnel chamber, inside which is mounted a chain conveyor with driving and driven sprockets, load-carrying elements, the IR emitters with reflectors on top of the camera mounted electric air heater, fan, an annular heat exchanger equipped with inlet and outlet nozzles of the drying agent. On the branches of the conveyor chain, lodgments with folding clamps are mounted, on which load-bearing elements are fixed, which are used as wooden poles. The calculation of the drive and chain transmission of the drying plant conveyor was carried out according to the existing method according to the scheme shown in the figure. Thus, the main parameters of the drive and chain transmission parts of the mechanized chamber-chain drying plant for drying melon fruits were determined by calculation

scholarly journals Fundamental Analysis of Trochoidal Sprocket for Roller Chain Drive (1st Report). Kinematical Tooth Profile Conditions.

2001 ◽  
Vol 67 (11) ◽  
pp. 1829-1833
Author(s):  
Hidetsugu TERADA ◽  
Kazuyoshi ISHIDA ◽  
Hiroyuki CHIBA ◽  
Hiroshi MAKINO ◽  
Rinzoh IRIE
Keyword(s):  
Tooth Profile ◽  
Fundamental Analysis ◽  
Chain Drive ◽  
Roller Chain

Finish Roll Forming of Spur Gears for High Efficiency

2000 ◽  
Author(s):  
Seizo Uematsu ◽  
Masana Kato
Keyword(s):  
Plastic Deformation ◽  
High Speed ◽  
High Efficiency ◽  
Tooth Profile ◽  
Roll Forming ◽  
Spur Gears ◽  
Design Data ◽  
Constant Center ◽  
The Relationship ◽  
Center Distance

Abstract Finish roll forming under the constant center distance by forced feed of tool can be conceived as a method of eliminating errors in conventional form rolling under constant loads. This method generates a high-precision tooth profile by low-speed form rolling when a high rigid screw or cam is used as loading parts. In this study, the high-speed rolling conditions of this method for necessary to be applied in practical situations are discussed. The following conclusions are obtained. When the following design data are given (module, number of teeth, addendum modification coefficient, prescribed design precision, and material characteristics), the accuracy of rolled gear can be predicted from the relationship between the required feed for the tool and the theoretically calculated plastic deformation on the tooth profile. These conclusions are verified experimentally. For example, the tooth accuracy of rolled gears with module 5 can improve from JIS class 3 to JIS class 0 or 1 when the load Fmax is 4 to 5kN and the pitch line velocity is 7 m/min.

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