Design of a Self-Actuating, Traction Drive System for High-Speed Ratios

2003 ◽  
Author(s):  
Michael J. Harper ◽  
Donald R. Flugrad ◽  
Abir Z. Qamhiyah
Keyword(s):  
High Speed ◽  
Power Transmission ◽  
Drive System ◽  
Speed Ratio ◽  
Rolling Motion ◽  
Traction Drive ◽  
Rolling Elements ◽  
Drive Systems ◽  
Two Stages ◽  
Efficient Power

Traction drive systems offer unique advantages over geared systems. They will typically run quieter and they can be designed to eliminate all backlash. Furthermore, rolling elements are easy to manufacture and the rolling motion will produce very efficient power transmission. In this paper the authors describe a two-stage, self-actuating, traction drive system that has been fabricated to produce a speed ratio of 50:1. Given specific values for coefficients of friction, the geometry of each stage of the device must be designed to ensure self-actuation. In addition, dimensions of the drive rollers and output rings for the two stages must be selected to ensure that one stage does not cause the other stage to overrun.

A Self-Actuating Traction-Drive Speed Reducer

2004 ◽  
Vol 127 (4) ◽  
pp. 631-636 ◽  
Author(s):  
Donald R. Flugrad ◽  
Abir Z. Qamhiyah
Keyword(s):  
Friction Coefficient ◽  
Normal Force ◽  
Drive System ◽  
Traction Drive ◽  
Sliding Motion ◽  
Output Torque ◽  
Speed Reducer ◽  
Rolling Elements ◽  
Drive Speed ◽  
High Output

Traction-drive speed reducers offer certain advantages over geared speed reducers. In particular, they generally run quieter than geared units and provide an opportunity for higher efficiency by eliminating sliding motion between contacting elements. In order to generate a sufficiently high output torque, some means must be provided to create a normal force between the rolling elements. This normal force, along with the friction coefficient, enables the device to transmit torque from one rolling member to the next. The speed reducer proposed here is designed so that the configuration of the rolling elements creates the needed normal force in response to the torque exerted back on the system by the downstream loading. Thus the device is self-actuating. Since the normal force is only present when needed, the rolling elements of the device can readily be disengaged, thus eliminating the need for a separate clutch in the drive system. This feature can be exploited to design a transmission with several distinct speed ratios that can be engaged and disengaged in response to changing speed requirements.

Electro-Hydraulic Digital Control of Cone-Roller Toroidal Traction Drive Automatic Power Transmission

1984 ◽  
Vol 106 (4) ◽  
pp. 305-310 ◽  
Author(s):  
H. Tanaka ◽  
T. Ishihara
Keyword(s):  
Power Transmission ◽  
Computer Control ◽  
Speed Ratio ◽  
Test Results ◽  
Optimum Conditions ◽  
Propulsion Systems ◽  
Traction Drive ◽  
Automatic Transmissions ◽  
Optimum Speed ◽  
Toroidal Traction

Continuously variable automatic transmissions can bring improved fuel economy benefits under good speed ratio changes for automobile propulsion systems in which engines can produce their power under optimum conditions. These systems require computer control for the calculation of optimum speed ratio. The paper presents design features of the electrohydraulic interface between micro-computer and cone-roller toroidal traction drive CVT, dynamic characteristics of cone roller motion, and test results of the practical computer control of CVT.

Working Process Simulation of the Gear Drive System in ADAMS

2013 ◽  
Vol 821-822 ◽  
pp. 1488-1491 ◽  
Author(s):  
Xing Han ◽  
Hua Song ◽  
Chang Li ◽  
Yun Fei Li
Keyword(s):  
High Speed ◽  
Drive System ◽  
Test Model ◽  
Random Errors ◽  
Heavy Load ◽  
Virtual Test ◽  
Gear Drive ◽  
Physical Tests ◽  
Drive Systems ◽  
The Cost

Gear drive systems have been used widely in mechanical power and motion transmissions, and their mechanical properties and working performances such as vibrations and noise caused by high-speed and heavy-load could influence the whole machines quality. In a traditional analysis, in order to research the effects of different random errors, on gear drive systems vibration and noise we need to do multiple repetitive physical tests, which will take lots of time, labor and financial input to acquire. On the contrary, virtual reliability tests developed recently can take place of the physical tests to analyze the systems dynamic characteristics accurately sometimes (reduce the cost and raise efficiency). In this paper, ADAMS/APDL technology combined with Pro/E software is a successful method to build a total coupled parametric virtual test model of the gear drive system; subsequently, every parts dynamic characteristic curves and data are obtained conveniently, and these will be meaningful for further analysis of the relationship among inputs, systems, and responses.

scholarly journals Determining the Power Consumption of the Automatic Device for Belt Perforation Based on the Dynamic Model

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 317
Author(s):  
Dominik Wojtkowiak ◽  
Krzysztof Talaśka ◽  
Dominik Wilczyński ◽  
Jan Górecki ◽  
Krzysztof Wałęsa
Keyword(s):  
High Speed ◽  
Equations Of Motion ◽  
Automatic Device ◽  
Drive System ◽  
Correct Operation ◽  
Timing Belt ◽  
Two Stages ◽  
Belt Transmission ◽  
Linear Drive System ◽  
Selection Of

The subject of the dynamic analysis presented in the article is the linear drive system with a timing belt utilized in the automatic device for polymer composite belt perforation. The analysis was carried out in two stages. In the first stage, the timing belt was modeled with all the relevant dynamic phenomena; subsequently, the tension force of the belt required for the correct operation of the belt transmission was determined. The necessary parameters for belt elasticity, vibration damping, and inertia are based exclusively on the catalog data provided by the manufacturer. During the second stage, equations of motion were derived for the designed drive system with a timing belt, and characteristics were identified to facilitate the optimal selection of electromechanical drives for the construction solution under analysis. The presented methodology allows for designing an effective solution that may be adapted for other constructions. The obtained results showed the influence of the kinematic parameters on the motor torque and proved the importance of reducing the mass of the components in machines that perform high-speed processes.

Application Research on CHR2 Type EMU Braking System

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Lei Pan
Keyword(s):  
High Speed ◽  
Power Source ◽  
Drive System ◽  
Application Research ◽  
Power Sources ◽  
Traction Drive ◽  
Braking System ◽  
Multi Level ◽  
Traction Power

CRH2 high-speed EMU is power source of traction drive system. The whole system is evenly distributed among the four basic units of the whole EMU, forming a complete combination of power sources. Large traction power, start smooth, fast and efficient, effectively inhibit the idle and taxi protection in place and other characteristics, and with a number of system chain control, to achieve smooth operation, multi-level speed and accurate parking.

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