Infinitely Variable Transmission of Racheting Drive Type Based on One-Way Clutches

An infinitely variable transmission (IVT), based on the use of one-way action clutches, belonging to the family of ratcheting drives is described. The mechanical foundations and numerical simulations carried out along this research envisage a plausible approach to its use as gear-box in general mechanical industry and its prospective use in automobiles and self-propelled vehicles. The system includes one-way clutches—free wheels or overrunning clutches—and two epicyclic gear systems. The output velocity, with oscillatory character, common to the ratcheting drives systems, presents a period similar to that produced by alternative combustion motors, making this transmission compatible with automobile applications. The variation of the transmission is linear in all the working range. The kinematics operating principles behind this IVT is described followed by a numerical simulation of the dynamic analysis. A prototype has been constructed and tested to assess its mechanical efficiency for different reduction ratios. The efficiency values predicted by theory agree with those experimentally obtained on a bench-rig testing equipment.

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Modeling and Simulation of an Inertia-Type Infinitely Variable Transmission

Journal of Mechanical Design ◽

10.1115/1.4000454 ◽

2010 ◽

Vol 132 (3) ◽

Cited By ~ 4

Author(s):

Giovanni Berselli

Keyword(s):

Mathematical Model ◽

Modeling And Simulation ◽

Numerical Simulations ◽

Gear Train ◽

Linkage Mechanism ◽

Manual Gearbox ◽

Epicyclic Gear ◽

Variable Transmission ◽

Infinitely Variable Transmission ◽

Four Bar Linkage

A fully mechanical, infinitely variable transmission (IVT) based on the use of an oscillating inertia is described. The system includes a four-bar linkage mechanism, an epicyclic gear train, and a pair of one-way clutches. The IVT can be used in place of both gearbox and clutch in self-propelled vehicles. A mathematical model is presented. Numerical simulations compare the behavior of a car fitted with a manual gearbox and the same car fitted with the IVT.

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Design and Analysis of a Novel Power-Split Infinitely Variable Power Transmission System

Journal of Mechanical Design ◽

10.1115/1.4041783 ◽

2019 ◽

Vol 141 (5) ◽

Cited By ~ 4

Author(s):

Ender İnce ◽

Mehmet A. Güler

Keyword(s):

Power Flow ◽

Power Transmission ◽

Mechanical Efficiency ◽

Flow Equations ◽

Power Split ◽

Variable Transmission ◽

Infinitely Variable Transmission ◽

Variable Power ◽

New System ◽

Agricultural Machines

In the last few decades, power-split infinitely variable transmission (IVT) systems have attracted considerable attention as they ensure high driving comfort with high total efficiencies, especially in off-highway vehicles and agricultural machines. In this study, a novel power-split-input-coupled IVT system is developed. The effects of various dynamic parameters such as power flow and Willis transmission ratio on the mechanical efficiency of the systems are investigated. Kinematic analysis of the new system has been carried out. In addition power flow equations are derived as functions of the power that flows through the infinitely variable unit (IVU). The results indicate that the main parameters, which are strictly related to mechanical efficiency are the power and torque flows through the IVU.

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Design Optimization of Input and Output Coupled Power Split Infinitely Variable Transmissions

Journal of Mechanical Design ◽

10.1115/1.3179145 ◽

2009 ◽

Vol 131 (11) ◽

Cited By ~ 7

Author(s):

S. Schembri Volpe ◽

G. Carbone ◽

M. Napolitano ◽

E. Sedoni

Keyword(s):

A Priori ◽

Optimization Procedure ◽

Mechanical Efficiency ◽

Vehicle Speed ◽

Mixed Solution ◽

Input And Output ◽

Power Split ◽

Variable Transmission ◽

Infinitely Variable Transmission ◽

Coupled Solution

The authors present an optimization procedure in designing infinitely variable transmission architectures, which allows them to achieve a significant reduction in power recirculation and, hence, an increase in mechanical efficiency. The focus of this paper is on infinitely variable transmissions used in off-highway vehicles and, in particular, on input and output coupled architectures. The optimized solutions have been analyzed in depth, with particular attention to the power flowing through the infinitely variable unit, which strongly influences the overall efficiency of the transmission. The major result of this study is that the so far neglected output coupled solution, if properly optimized, guarantees very good performance over the entire range of vehicle speed. The analysis then shows that the particular choice of either input or output coupled architecture by itself, or of a mixed solution, strictly depends on the specific application under consideration and that none of them should be discarded a priori.

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Deployment Simulation of a Parabolic Space Antenna with Rigid Panels

International Journal of Space Structures ◽

10.1177/0266351193008001-207 ◽

1993 ◽

Vol 8 (1-2) ◽

pp. 63-70 ◽

Cited By ~ 1

Author(s):

B. Specht

Keyword(s):

Numerical Simulation ◽

Dynamic Analysis ◽

Numerical Simulations ◽

Failure Mode ◽

Space Antenna ◽

Inverse Dynamic ◽

Static And Dynamic Analysis ◽

Software Packages ◽

Panel Type

This paper deals with the numerical simulation of the deployment process of a parabolic space reflector. The described deployable antenna is of the rigid panel type. The numerical simulations cover kinematic, inverse dynamic, quasi-static and dynamic analysis modes. Special phenomena included are hinge friction and the investigation of a deployment failure mode. Different software packages have been applied and their performance has been assessed.

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Dynamic Analysis of a Novel Geared Infinitely Variable Transmission

Volume 4B: Dynamics, Vibration, and Control ◽

10.1115/imece2014-36551 ◽

2014 ◽

Author(s):

Z. R. Li ◽

X. F. Wang ◽

W. D. Zhu

Keyword(s):

Dynamic Analysis ◽

Wind Turbine ◽

Speed Ratio ◽

Lagrangian Dynamics ◽

Input And Output ◽

Newtonian Dynamics ◽

Continuous Output ◽

Variable Transmission ◽

Infinitely Variable Transmission ◽

Crank Length

A novel geared infinitely variable transmission (IVT) that can generate a continuous output-to-input speed ratio from zero to a certain value is studied for vehicle and wind turbine applications. The principle of changing the output-to-input speed ratio is to use a crank-slider mechanism; the output-to-input speed ratio is controlled by adjusting the crank length. Since the crank-slider mechanism can lead to relatively large variation of the output-to-input speed ratio in one rotation of the crank, the instantaneous input and output speeds and accelerations have variations and the corresponding forces exerted on each part of the IVT can have obvious changes in one rotation of the crank. Since forces on some parts of the IVT are critical and can cause failure of the IVT, a dynamic analysis of the IVT is necessary to simulate the input and output speeds and accelerations. A method that combines Lagrangian dynamics and Newtonian dynamics is developed in this work to analyze the motion of the IVT. The dynamic analysis results can be used to evaluate the design of the IVT.

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Dynamic Analysis of Vibrating Device

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.164.327 ◽

2010 ◽

Vol 164 ◽

pp. 327-332 ◽

Cited By ~ 2

Author(s):

Arkadiusz Trąbka ◽

Ludwik Majewski ◽

Jacek Kłosiński

Keyword(s):

Numerical Simulation ◽

Dynamic Analysis ◽

Numerical Simulations ◽

Essential Element ◽

Graphical Form ◽

Central Position ◽

Vibrating Table ◽

Transversal Stiffness ◽

Vibrating Plate

Dynamics of two models (simplified and complex) of a small, typical vibrating table is considered in the paper. The table consists of vibrating plate and electrical vibrator, mounted in the central position of the plate, which excites the vibrations of the table. The coefficient of transversal stiffness of the spring has been determined on the basis of numerical simulation. The spring is an essential element of the system. The results of performed numerical simulations are presented in the graphical form.

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Mechanical Efficiency of HMCVT under Steady-State Conditions

Shock and Vibration ◽

10.1155/2021/4275922 ◽

2021 ◽

Vol 2021 ◽

pp. 1-14

Author(s):

Guangqing Zhang ◽

Hengtong Zhang ◽

Yanyan Ge ◽

Wei Qiu ◽

Maohua Xiao ◽

...

Keyword(s):

Steady State ◽

Mechanical System ◽

Hydraulic System ◽

Power Flow ◽

Ride Comfort ◽

Mechanical Efficiency ◽

Gear Train ◽

Epicyclic Gear ◽

Physical Prototype ◽

Variable Transmission

Hydromechanical continuously variable transmission (HMCVT) technology has been widely used due to its advantages of ride comfort and fuel economy. The relatively uniform efficiency expression of HMCVT is obtained by studying torque and transmission ratios to reveal steady-state characteristics and predict the output torque. Mathematical models of torque ratios are derived by analyzing the HMCVT system power flow and calculating the equivalent meshing power of epicyclic gear train and efficiency for the hydraulic system. The relationship between mechanical system transmission and hydraulic system parameters is established using the torque ratios, and a mechanical system demanding surface is proposed. Two numerical examples of the HMCVT system with single and dual variable units are demonstrated to establish an effective and convenient method. The method is validated through a physical prototype TA1-02 test.

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Dynamic Analysis of a Geared Infinitely Variable Transmission

Journal of Computational and Nonlinear Dynamics ◽

10.1115/1.4033896 ◽

2016 ◽

Vol 12 (3) ◽

Cited By ~ 2

Author(s):

X. F. Wang ◽

Z. R. Li ◽

W. D. Zhu

Keyword(s):

Dynamic Analysis ◽

Speed Ratio ◽

Force Analysis ◽

Maximum Torque ◽

Input Shaft ◽

Continuous Output ◽

Input Side ◽

Variable Transmission ◽

Infinitely Variable Transmission ◽

Output Side

Dynamic analysis of a geared infinitely variable transmission (IVT) that can generate a continuous output-to-input speed ratio from zero to a certain value is studied for vehicle and wind turbine applications. With the IVT considered as a multirigid-body system, the Lagrangian approach is used to analyze its speeds and accelerations, and the Newtonian approach is used to conduct force analysis of each part of the IVT. Instantaneous input and output speeds and accelerations of the IVT have variations in one rotation of its input shaft. This work shows that the instantaneous input speed has less variation than the instantaneous output speed when the inertia on the input side is larger than that on the output side and vice versa. The maximum torque on the output shaft that is a critical part of the IVT increases with the input speed.

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