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Technical Brief

On Rolling Resistance in Gear Transmission

[+] Author and Article Information
S. S. Ghosh

Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
e-mail: ghoshss123@gmail.com

G. Chakraborty

Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721302, India
e-mail: goutam@mech.iitkgp.ernet.in

1Corresponding author.

Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received June 12, 2014; final manuscript received December 21, 2014; published online February 6, 2015. Assoc. Editor: Qi Fan.

J. Mech. Des 137(4), 044501 (Apr 01, 2015) (4 pages) Paper No: MD-14-1340; doi: 10.1115/1.4029517 History: Received June 12, 2014; Revised December 21, 2014; Online February 06, 2015

The effect of rolling resistance on the power loss during gear transmission has been studied. The resistance has been modeled by a lateral shift of the line of action of the contact force. The effect of this shift on the equivalent friction force has been predicted with the help of a six degrees of freedom (DOF) model of a spur gear pair. The predicted results agree closely with the experimental data available in literature.

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References

Figures

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Fig. 1

Six DOF spur gear model

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Fig. 2

Effective tooth friction force with different friction conditions at 500 rpm. : sliding friction, tooth 1; : sliding and rolling (EHL) friction, tooth 1; : sliding and rolling (EHL and shifting) friction, tooth 1; : sliding friction, tooth 2; : sliding and rolling (EHL) friction, tooth 2; : sliding and rolling (EHL and shifting) friction, tooth 2; : line at pitch point of tooth1; and : line at pitch point of tooth 2.

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Fig. 3

Friction force at (a) 800 rpm, 110% torque and (b) 2000 rpm, 110% torque. : simulated data for tooth 1; : simulated data for tooth 2; : line at pitch point of tooth 1; : line at pitch point of tooth 2; : experimental data of tooth 1; and : experimental data of tooth 2.

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Fig. 4

(a) Rolling toque in a mesh cycle for ς = 0.7. : rolling torque for #1; : rolling torque for #0; and : combined rolling torque for both pair. (b) Combined rolling toque in a mesh cycle for ς = 0.3 and ς = 0.7. : rolling torque for ς = 0.7 and : rolling torque for ς = 0.3.

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Fig. 5

Power losses in a complete meshing time for (a) ς=0.7 and (b) ς=0.3. : rolling (EHL and shifting), #1; : rolling (EHL and shifting), #0; : rolling (EHL and shifting), both pair; : power loss due to sliding friction, both pair; and : total mechanical power loss, both pair.

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