The Transmission Performances of Traction Infinitely Variable Transmission Used in Electric Vehicle Power Train

2012 ◽  
Vol 271-272 ◽  
pp. 1239-1243
Author(s):  
Fen Zhu Ji ◽  
Hao Hua Du
Keyword(s):  
Basic Structure ◽  
Transmission Efficiency ◽  
Transmission Characteristics ◽  
Power Train ◽  
Pure Rolling ◽  
Adams Software ◽  
Calculation Results ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Working Principle

The traction infinitely variable transmission (TIVT) used in the power train of electric vehicles (EVS) was designed. Firstly, based on the analysis of basic structure and working principle, the mathematic models were established on the transmission ratio, slipping ratio, transferring torsion and transmission efficiency; Secondly, Transmission characteristics of the TIVT were analyzed and calculated using ADAMS software. The calculation results show that: the export torsion varies with sway angle of steer ring as the import torsion is fixed. The transmission efficiency of TIVT is large when the motion of driving parts is pure-rolling or the slipping ratio is less. The efficiency could be reached more than 99% by rational designing. Theoretically, the driving distance of EVS matched with TIVT could be increased.

scholarly journals Transmission characteristics and phase number optimization on the transmission mechanism of rod gear pulse continuously variable transmission

2018 ◽  
Vol 10 (1) ◽  
pp. 168781401775196
Author(s):  
Suifan Chen ◽  
Zhifeng Dong
Keyword(s):  
Single Phase ◽  
Basic Structure ◽  
Continuously Variable Transmission ◽  
Transmission Characteristics ◽  
Continuously Variable Transmissions ◽  
The Matrix ◽  
Variable Transmission ◽  
Working Principle ◽  
Eccentric Wheel ◽  
Selection Of

In order to solve the oversize problem of continuously variable transmission, a rod gear pulse continuously variable transmission is designed. The kinematic mathematical models of key components are established by the matrix method and are simulated by MATLAB in a single phase, based on the analysis of basic structure and working principle of transmission. Also, the length requirements of each rod are studied, and the effect of three adjustment manners on the output-speed is simulated in the single phase. Furthermore, the simulations of the movement law of annular gear are achieved on two conditions of both different phases and different eccentricities on 8-phase. The results show that the manner of adjusting the eccentricity of eccentric wheel is the preferential selection of out-speed regulating method, and 8-phase is an optimal phase of transmission; meanwhile, for the rod gear pulse continuously variable transmission, the variable range of transmission ratio is wider and the pulsation rate is far less than the other traditional continuously variable transmissions.

Analysis on Transmission Characteristics of New Axis-Fixed Cycloid Gear

2010 ◽  
Vol 97-101 ◽  
pp. 60-63 ◽  
Author(s):  
Cai Chao Zhu ◽  
Ming Yong Liu ◽  
Xue Song Du ◽  
Ning Xiao ◽  
Bin Zhang
Keyword(s):  
Bearing Capacity ◽  
Simple Structure ◽  
Basic Structure ◽  
Transmission Efficiency ◽  
Torsional Stiffness ◽  
Experimental Result ◽  
Test Bed ◽  
Transmission Characteristics ◽  
High Transmission ◽  
Low Efficiency

Due to those disadvantages of the cycloidal-pin wheel transmission, such as low efficiency, low bearing capacity and poor rigidity, a new kind of axis-fixed cycloid transmission is proposed after generalizing those advantages of axis-fixed drive, cycloid drive and oscillating-tooth drive. Special output mechanism is unnecessary here because the motion is exported directly by the cycloid gear. Thus, there are many advantages of this new transmission-simple structure, small size, high transmission efficiency and large torsional stiffness. The transmission theory and basic structure are analyzed and the formula for the transmission efficiency is derived. A prototype is manufactured and the efficiency experiment is carried out on the test bed. The experimental result verifies the correctness of the therotical analysis.

Infinitely Variable Transmission (IVT) of John Deere 7000 TEN Series Tractors

2002 ◽  
Author(s):  
Sanjay I. Mistry ◽  
Gregory E. Sparks
Keyword(s):  
Transmission System ◽  
Electric Signal ◽  
Mechanical Transmission ◽  
Power Train ◽  
Performance Improvements ◽  
Reverse Mode ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Hydrostatic System ◽  
And Control

The John Deere 7000 TEN series tractors represent a significant change in the transmission system compared to previous John Deere tractor models in this category. John Deere 7710 and 7810 series tractors are the first of the 7000 TEN series tractors offering an infinitely variable transmission (IVT). These tractors provide infinite vehicle speeds in the forward mode from 50 meters/hr to 40 km/hr or an optional 50 km/hr. Reverse mode provides infinite vehicle speeds from 50 meters/hr to 17 km/hr. The IVT provides performance improvements in several areas for unmatched operator convenience and control. The new IVT uses an electric signal to control the electro-hydraulic hydrostatic system with mechanical power train. The IVT represents a hydro-mechanical transmission system using electronics, hydraulics and mechanical systems’ integration to achieve the required performance. This paper describes the IVT system configuration, components, operation, characteristics and some of the engineering considerations dealt with in the development process. The overall IVT system truly represents a “drive-by-wire” mechatronic design.

A Positively-Engaged Infinitely Variable Transmission Using Split Helical Gears

2018 ◽  
Author(s):  
Ethan R. Brush ◽  
Carl A. Nelson
Keyword(s):  
Angular Velocity ◽  
Electric Vehicles ◽  
Gear Ratio ◽  
Helical Gears ◽  
Continuously Variable Transmissions ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
New Type ◽  
Working Principle

Continuously variable transmissions (CVTs), and the subset known as infinitely variable transmissions (IVTs) with gear ratio ranges reaching zero (0:1 or 1:∞ or “geared neutral”), offer motors the ability to run in preferred angular velocity ranges independent of transmission output speed, allowing optimization for power, torque, and efficiency. This paper presents and analyzes a positively engaged IVT (PE-IVT) mechanism of an entirely new type and working principle which solves the problems of current CVTs and is applicable to the unique requirements of robots, electric vehicles (EVs), and hybridelectric vehicles (HEVs).

Design, Modeling, and Simulation of a Geared Infinitely Variable Transmission

2014 ◽  
Vol 136 (7) ◽  
Author(s):  
X. F. Wang ◽  
W. D. Zhu
Keyword(s):  
Planetary Gear ◽  
Speed Ratio ◽  
Start Up ◽  
Continuous Output ◽  
Direction Control ◽  
Variable Transmission ◽  
Infinitely Variable Transmission ◽  
Planetary Gear Sets ◽  
Working Principle ◽  
Crank Length

An infinitely variable transmission (IVT) to provide a continuous output-to-input speed ratio from zero to a certain value is designed, and its working principle is illustrated. It is a geared IVT (GIVT), since its function to achieve the continuously varied speed ratio is implemented by gears. Crank-slider systems are used in the GIVT; the output-to-input speed ratio is changed with the crank length. Racks and pinions, whose motion is controlled by planetary gear sets, are used to change the crank length when the cranks rotate. One-way bearings are used to rectify output speeds from different crank-slider systems to obtain the output speed of the GIVT. Since the crank-slider systems can introduce variations of the instantaneous speed ratio, a pair of noncircular gears is designed to minimize the variations. A direction control system is also designed for the GIVT using planetary gear sets. Finally, a vehicle start-up simulation and a wind turbine simulation to maintain a constant generator speed are developed based on a GIVT module in the Matlab Simulink environment.

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

2019 ◽  
Vol 141 (5) ◽  
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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