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Technical Briefs

Experimental Research on Drag Torque for Single-plate Wet Clutch

[+] Author and Article Information
Hu Jibin

 Beijing Institute of Technology, Beijing 100081, Chinahujibin@bit.edu.cn

Peng Zengxiong

 Beijing Institute of Technology, Beijing 100081, Chinapengzengx@bit.edu.cn

Wei Chao

 Beijing Institute of Technology, Beijing 100081, Chinaweipeter1@163.com

J. Tribol 134(1), 014502 (Feb 09, 2012) (6 pages) doi:10.1115/1.4005528 History: Received September 21, 2009; Revised December 09, 2011; Published February 08, 2012; Online February 09, 2012

The relative motion between the friction and separate plates in a disengaged wet clutch causes viscous drag torque when the lubrication fluid flows through the clearance. Reduction of the drag torque is one of the important potentials for the improvement of transmission efficiency. The objective of this study is to set up an experimental rig to measure drag torque for a single-plate wet clutch. Visualization of the flow pattern in the clearance through transparent quartz was presented. Design factors and lubrication conditions were tested to evaluate the effects on drag torque. A comparison between the nongrooved plate and grooved plate was made. Plates made up of different materials were also tested to reveal the effects caused by the contact angle. Drag torque increases linearly at low rotating speeds and gradually decreases at high rotating speeds. It is confirmed that fluid completely covers the plate surface at a low rotating speed and air mixes with the fluid at a high rotating speed. A low feeding flow rate is useful to reduce drag torque. The reduction of the drag torque benefits from radial and deep grooves compared to a flat plate. A small contact angle near the stationary plate plays an important role in maintaining the oil film, however, it has little effect on the drag torque at the rotating side because the hydrodynamic force becomes dominant compared to the surface tension force. The test results help to build an accurate mathematical model based on two-phase flow lubrication.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Experimental rig for a single-plate wet clutch

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Figure 2

Diagram of the experimental rig for a single-plate wet clutch

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Figure 3

Plate-view flow pattern in the gap at different rotating speeds

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Figure 4

Schematic diagram of partial oil film in the clearance

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Figure 5

Flow pattern in the clearance at different rotating speeds

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Figure 6

Three pattern groove plates: (a) declining groove, (b) screw groove, and (c) radial groove

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Figure 7

Comparison between the nongrooved plate and grooved plate

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Figure 8

Effects of groove numbers

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Figure 9

Effects of groove width

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Figure 10

Effects of groove depth

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Figure 11

Effect of radial grooves on the rotating or stationary side

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Figure 12

Effect of declining grooves on the rotating or stationary side

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Figure 13

Effect of screw grooves on the rotating or stationary side

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Figure 14

Comparison between different flow rates

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Figure 15

Effect of different temperatures

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Figure 16

Effect of different clearances

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Figure 17

Measuring device of contact angles

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Figure 18

Test results of contact angles

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Figure 19

Effects of contact angles

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