Development of Friction Drive Transmission

[+] Author and Article Information
Xiaolan Ai, Matthew Wilmer, David Lawrentz

The Timken Company

ABAQUS is a registered trademark of ABAQUS , Inc. It is a finite element analysis software.

J. Tribol 127(4), 857-864 (Feb 18, 2005) (8 pages) doi:10.1115/1.2032993 History: Received September 29, 2004; Revised February 18, 2005

A cylindrical friction drive was developed for electric oil pump applications. It was comprised of an outer ring, a sun roller, a loading planet, two supporting planets, and a stationary carrier. The sun roller was set eccentric to the outer ring to generate a wedge gap that facilitates a torque actuated loading mechanism for the friction drive. The loading planet was properly assembled in the wedge gap and elastically supported to the carrier. By altering the stiffness ratio of the elastic support to contact, the actual operating friction coefficient of the friction drive can be changed regardless of the wedge angle to suit for performance requirement. This provided a greater freedom for design and performance optimization. Design analysis was presented and a FE model was developed to quantify design parameters. Prototypes of the friction drive were fabricated and extensive testing was conducted to evaluate its performance. Results indicated the performance of the friction drive far exceeded the design specifications in speed, torque, and power ratings. The friction drive offered a consistent smooth and quiet performance over a wide range of operating conditions. It was capable of operating at an elevated speed of up to 12 000 rpm with adequate thermal characteristics. The friction drive demonstrated a peak efficiency above 97%. Results confirmed that the stiffness of the elastic support has an important impact on performance. The elastic support stiffness, in conjunction with the contact stiffness, determines the actual operating friction coefficient at the frictional contacts.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Friction Drive Assembly

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Figure 2

Wedge gap between sun roller and outer ring

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Figure 3

Wedge action generate normal load

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Figure 4

Effect of stiffness ratio on operating friction coefficient

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Figure 5

FE model of friction drive

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Figure 11

Thermal characteristic of the friction drive

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Figure 10

Efficiencies for different clock springs

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Figure 9

Dynamic efficiency of friction drive under various conditions

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Figure 8

Support stiffness of loading planet

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Figure 7

Traction curve of Santotrac 50

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Figure 6

(a) test apparatus and (b) schematic of mechanical layout of test apparatus



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