The Fixed Ratio Traction Drive Speed Reducer—An Enabling Technology for Downsizing EV Motors

2022 ◽  
pp. 1619-1636
Author(s):  
Wang Wei ◽  
James Durack ◽  
Michael Durack ◽  
Zhang Jun ◽  
Zhao Peng
Keyword(s):  
Fixed Ratio ◽  
Enabling Technology ◽  
Traction Drive ◽  
Speed Reducer ◽  
Drive Speed

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.

Automotive Traction Drive Speed Reducer Efficiency Testing

2021 ◽  
Author(s):  
Wei Wang ◽  
James M. Durack ◽  
Michael J. Durack ◽  
Jun Zhang ◽  
Peng Zhao
Keyword(s):  
Traction Drive ◽  
Speed Reducer ◽  
Drive Speed

Design of a Self-Actuating, Traction Drive Speed Reducer

2000 ◽  
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

Abstract Traction drive speed reducers offer certain advantages over geared speed reducers. In particular, they generally run quieter than geared units, and they 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. This eliminates the need for a separate clutch in the drive system. This feature can be exploited to design a transmission with several distinct speed ratios which can be engaged and disengaged in response to changing speed requirements.

Force Simulation of Cycloid Gear of Horizontal Three-Gear Cycloid Reducer

2011 ◽  
Vol 66-68 ◽  
pp. 1993-1997 ◽  
Author(s):  
Ying Shi Sun ◽  
Tian Min Guan ◽  
Shu Lian Zhang
Keyword(s):  
Service Life ◽  
High Precision ◽  
Fatigue Resistance ◽  
High Efficiency ◽  
Good Stability ◽  
The World ◽  
Speed Reducer ◽  
Drive Speed ◽  
Wave Drive ◽  
Return Difference

The speed reducer with three cycloid gears, namely FA high-precision drive speed reducer, is the most advanced drive device all over the world. The speed reducer has the advantages of small size, little weight, large drive range, long service life, good rigidity, good stability and precision, high efficiency and stable drive. Compared with wave drive by robots, the speed reducer has better fatigue resistance, bigger rigidity, longer service life and higher return difference precision; the FA speed reducer is used more and more frequently in becomes the weakest part of the whole structure. The paper mainly focuses on the study of this structure. When cycloid drive adopts a large drive ratio, in order to avoid the interference of cycloid gears, the size of gears is very small so that the strength of gears is reduced, which becomes the weakness for drive. Therefore, the paper adopts the new structure of horizontal gears. The paper analyzes the force upon cycloid gears of this structure mainly by analysis, the sketch of this new structure of horizontal gears for three-gear cycloid gear.

Design and Finite Element Modal Analysis of Torque Feedback Subsystem in Automobile Steer by Wire System

2012 ◽  
Vol 253-255 ◽  
pp. 2163-2167
Author(s):  
Lei Yan Yu ◽  
Wan Zhong Zhao ◽  
Jian Bo Yi
Keyword(s):  
Modal Analysis ◽  
Force Feedback ◽  
Mechanical Parts ◽  
Contour Maps ◽  
Steer By Wire ◽  
Speed Reducer ◽  
Safety And Reliability ◽  
Drive Speed ◽  
Vibration Performance ◽  
Wire System

Safety and reliability are requirements of automobile steer by wire system. Firstly, steering force feedback subsystem of steer by wire is designed. Design of steer by wire system mechanical parts must consider effects of automobile vibration environment. Then, worm of worm drive speed reducer is modeled using ANSYS software and modal analysis is performed. Natural frequencies and vibration mode contour maps of each order are acquired. The results show that the modal analysis of worm is valid and can predict worm’s vibration performance; both structure and material affect the part’s vibration performances.

scholarly journals An Analysis of Traction Drive Torsional Stiffness

1985 ◽  
Vol 107 (4) ◽  
pp. 573-581
Author(s):  
D. A. Rohn ◽  
S. H. Loewenthal
Keyword(s):  
Static Loading ◽  
Fixed Ratio ◽  
Torsional Stiffness ◽  
Mesh Stiffness ◽  
Traction Drive ◽  
Gear Mesh ◽  
Elastic Bodies ◽  
Design Variables ◽  
Experimental Values ◽  
Gear Mesh Stiffness

An analysis of the tangential compliance of elastic bodies in concentrated contact is applied to traction drive elements to determine their torsional stiffness. Both static loading and rotating conditions are considered. The effects of several design variables are shown. The theoretical torsional stiffness of a fixed ratio multiroller traction drive is computed and compared to experimental values. The analysis shows that the torsional compliance of the traction contacts themselves is a relatively small portion of the overall drive system compliance. Comparison is also made to theoretical gear mesh stiffness.

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