Geometrico-Static Modeling and Simulation of the Contact between Chain and Guide of a Reference Transmission

2014 ◽  
Vol 658 ◽  
pp. 111-116
Author(s):  
Radu Papuc ◽  
Radu Velicu ◽  
Mihai Tiberiu Lates ◽  
Codruta Jaliu
Keyword(s):  
Mathematical Model ◽  
Modeling And Simulation ◽  
Experimental Determination ◽  
Transmission Ratio ◽  
Chain Drive ◽  
Model And Simulation ◽  
Static Modeling ◽  
Chain Drives

In order to evaluate friction losses from chain drives, an important aspect to regard is the friction between chain and guide. This paper is proposing a mathematical model and simulation of the chain-guide contact, for a reference chain drive with transmission ratio equal to 1. The transmission is subject of further experimental determination of friction losses.

Research on a Generating Method of Spiral Flutes of Hourglass Worm Gear Hob

2017 ◽  
Author(s):  
Yang Jie ◽  
Li Haitao ◽  
Rui Chengjie ◽  
Wei Wenjun ◽  
Dong Xuezhu
Keyword(s):  
Mathematical Model ◽  
Manufacturing System ◽  
Worm Gear ◽  
Virtual Manufacturing ◽  
Transmission Ratio ◽  
Method Of Determination ◽  
Generating Method ◽  
Multiple Threads ◽  
Different Shapes

All of the cutting edges on an hourglass worm gear hob have different shapes and spiral angles. If the spiral angles are small, straight flutes are usually adopted. But for the hob with multiple threads, the absolute values of the negative rake angles at one side of the cutting teeth will greatly affect the cutting performance of the hob if straight flutes are still used. Therefore, spiral flutes are usually adopted to solve the problem. However, no method of determination of the spiral flute of the hourglass worm gear hob has been put forward till now. Based on the curved surface generating theory and the hourglass worm forming principle, a generating method for the spiral flute of the planar double enveloping worm gear hob is put forward in this paper. A mathematical model is built to generate the spiral flute. The rake angles of all cutting teeth of the hob are calculated. The laws of the rake angles of the cutting teeth of four hobs with different threads from one to four threads are analyzed when straight flutes and spiral flutes are adopted respectively. The laws between the value of the negative rake angles of the hob with four threads and the milling transmission ratio are studied. The most appropriate milling transmission ratio for generating the spiral flute is obtained. The machining of the spiral flutes is simulated by a virtual manufacturing system and the results verify the correctness of the method.

Probability of Load-Carrying Ability of Two-Profile Chain Drives

2000 ◽  
Author(s):  
Petro D. Kryvyy ◽  
Ihor M. Bey ◽  
Oksana I. Shymanska ◽  
Petro P. Kryvyy
Keyword(s):  
Measurement Procedure ◽  
Chain Drive ◽  
Distribution Law ◽  
Drive Roller ◽  
Load Carrying ◽  
A Chain ◽  
Dimension Type ◽  
Chain Drives ◽  
Unit Pressure

Abstract The analysis of the available calculation methods of chain-drives load-carrying ability is given according to the criterion of the tolerance unit pressure in a single profile chain joint [p]0. It is shown, that the values of [p]0 were determined according to the deterministic ideas without consideration of the distribution law of both random varieties of contact step of inner and outer rings and lengths of drive strands of the first and second profile of the chain drive. Probability task of determination of the tolerance unit pressure in two profile chain joints [p0]q is solved, when the structural, technological and physical-mechanical characteristic of the chain, that is, the lengths of drive strand of a chain-drive, accuracy of contact steps and stiffness of a drive roller chain are considered. The measurement procedure and the empirical dependencies for determination of drive roller chains deformation and stiffness are presented. As a result, the dependencies for the determination of [p0]q as the basic criterion according to which selection of a chain dimension-type, as well as characteristics used for the comparative estimation of a drive chain quality of different manufacturers when certain probability estimations are taken into consideration, were obtained.

scholarly journals On the benchmarking of friction in timing chains

2018 ◽  
Vol 184 ◽  
pp. 02002
Author(s):  
Lenard Jurj ◽  
Radu Velicu
Keyword(s):  
Theoretical Approach ◽  
Rotational Speed ◽  
Experimental Validation ◽  
Transmission Ratio ◽  
Chain Drive ◽  
Input Shaft ◽  
Chain Drives

This paper is dealing with the evaluation of friction in timing chains. Benchmarking friction is based on the experimentally determined friction losses in basic chain drives with transmission ratio i=1. This friction is not including friction losses in bearings. These results should be used, in the simplest manner, in order to evaluate friction in timing chains (i = 2). We are presenting the theoretical approach and experimental validation that have been developed for the timing chain drives, with transmission ratio i = 2. Friction losses are presented as resistant friction torques at the input shaft, depending on input rotational speed and tensioning force in the chain drive.

scholarly journals OPTIMIZATION PARAMETERS OF IRRIGATION PROCESS ACCORDING TO THE UNIFORMITY

2012 ◽  
Vol 15 (1) ◽  
pp. 80-89
Author(s):  
Tuyen Vo ◽  
Nam Thanh Nguyen ◽  
Lien Duc Hoang
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Experimental Determination ◽  
Optimal Parameters ◽  
Optimization Parameters ◽  
Simulation Results

In order to determine the optimal parameters of irrigation process in order to verify the accuracy of the numerical simulation results of experimental determination of the effective spray during irrigation [2], [6]. This paper will conduct empirical planning, establishing empirical mathematical model to determine the diameter of the nozzle, swirl coefficient and irrigation output according to the uniformity.

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
Sign in / Sign up

Export Citation Format

Share Document