scholarly journals Investigation of Mechanical Differentials as Continuously Variable Transmissions

2011 ◽  
Author(s):  
Dax B. Wells ◽  
Benjamin C. Groen ◽  
Robert H. Todd
Keyword(s):  
Hybrid Electric Vehicle ◽  
Power Transmission ◽  
Power Sources ◽  
Single Output ◽  
Multiple Input ◽  
Continuously Variable Transmissions ◽  
Power Inputs ◽  
Variable Transmission ◽  
Reduce Emissions ◽  
Increasing Demand

In recent years the increasing demand for fuel efficient and less pollutant vehicles has stimulated the development of hybrid and electric vehicles. These vehicle platforms often incorporate drivetrains which utilize multiple power sources for vehicle propulsion to increase fuel mileage and reduce emissions. Understanding the torque and RPM relationship within the power transmission device used to combine power sources is fundamental to overcoming the design challenges associated with hybrid/electric vehicle platforms. Results from this research include the fundamental torque and RPM relationships that exist in a multiple-input, single-output power transmission device. Results were deduced from a test incorporating two separate power inputs into a mechanical differential, which produced a single output. Testing showed that a mechanical differential has the ability to function as an infinitely variable transmission (IVT). Additionally, recommendations for overcoming some of the challenges associated with using a mechanical differential as a multiple-input, single-output device were identified.

Multiple-Input Single-Output Wireless Power Transmission System for Coal Mine Application

2013 ◽  
Vol 462-463 ◽  
pp. 900-904 ◽  
Author(s):  
Duan Zhao ◽  
En Jie Ding ◽  
Hui Xue
Keyword(s):  
Coal Mine ◽  
Power Transmission ◽  
Homogeneous Distribution ◽  
Axial Component ◽  
Wireless Power ◽  
Wireless Power Transmission ◽  
Single Output ◽  
Multiple Input ◽  
Input Coil ◽  
Simulation Results

The magnetic multiple input algorithms of Wireless Power Transmission (WPT) system as well as many multiple overlapping coils structures in the transmitter side are proposed for the coal mine Internet of the Things (IOT) nodes. Different phase shifts cases for the input signal are considered to study their effect on the efficiency. Simulation results showed that the axial component of magnetic induction resulted from the multiple overlapping coils structure has preferable homogeneous distribution over the traditional single input coil. The proposed system achieved an efficiency value of 60 % for a receiver placed 40 cm away from a 4 coils transmitter comparing to an efficiency value of 50% for the same distance using a single coil transmitter. Simulation results shows that the proposed model is well adapted for the movable charging mode for the IOT nodes in coal mine.

A Survey of Positive Engagement, Continuously Variable Transmissions

2007 ◽  
Author(s):  
Brian S. Andersen ◽  
Ryan R. Dalling ◽  
Robert H. Todd
Keyword(s):  
High Performance ◽  
Power Transmission ◽  
Variable Ratio ◽  
New Family ◽  
Continuously Variable Transmissions ◽  
Variable Transmission ◽  
History Of ◽  
Ratio Change ◽  
Positive Engagement

A continuously variable transmission (CVT) is a type of transmission that allows an infinitely variable ratio change within a finite range, allowing the engine to continuously operate in an efficient or high performance range. A brief history of CVT’s is presented, including the families under which they can be categorized. A new family of CVT’s, with the classification of positive engagement, is presented. Three different published embodiments of CVT’s of the positive engagement type are presented describing a meshing problem that exists apparently regardless of the embodiment in this family. The problem is called the non-integer tooth problem and its occurrences are detailed in each of the three embodiments. Specific solutions to the problem, as embodied in each case, are presented. Two additional embodiments of the positive engagement type are also presented for comparison. These last embodiments rely on less efficient methods of power transmission but are not subject to the non-integer tooth problem.

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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