Parameter study on the influence of a radial groove design on the drag torque of wet clutch discs in comparison with analytical models

2018 ◽  
Vol 119 ◽  
pp. 809-821 ◽  
Author(s):  
Thomas Neupert ◽  
Elisabeth Benke ◽  
Dirk Bartel
Keyword(s):  
Analytical Models ◽  
Parameter Study ◽  
Drag Torque ◽  
Groove Design ◽  
Wet Clutch

Experimental Research on Drag Torque for Single-plate Wet Clutch

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Hu Jibin ◽  
Peng Zengxiong ◽  
Wei Chao
Keyword(s):  
Contact Angle ◽  
Surface Tension Force ◽  
Transmission Efficiency ◽  
Viscous Drag ◽  
Drag Torque ◽  
Two Phase ◽  
Rotating Speed ◽  
Single Plate ◽  
Wet Clutch ◽  
Set Up

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.

scholarly journals Prediction of Drag Torque in a Disengaged Wet Clutch of Automatic Transmission by Analytical Modeling

2016 ◽  
Vol 11 (2) ◽  
pp. 121-129 ◽  
Author(s):  
Shahjada Ahmed Pahlovy ◽  
Syeda Faria Mahmud ◽  
Masamitsu Kubota ◽  
Makoto Ogawa ◽  
Norio Takakura
Keyword(s):  
Analytical Modeling ◽  
Automatic Transmission ◽  
Drag Torque ◽  
Wet Clutch

Calculation and Analysis on Drag Torque of the Wet Clutch

2015 ◽  
Vol 741 ◽  
pp. 91-94 ◽  
Author(s):  
Li Ying Miao ◽  
Xiu Sheng Cheng ◽  
Xue Song Li ◽  
Li Chen Yang
Keyword(s):  
Structural Design ◽  
Theoretical Study ◽  
Influence Factors ◽  
Lubricating Oil ◽  
Drag Torque ◽  
Matlab Simulink ◽  
Simulink Simulation ◽  
Wet Clutch ◽  
Simulation Results

In order to study the drag torque characteristics of wet clutch, the drag torque with no groove friction plates and with radial groove friction plates were analysed separately, and the influence factors of the drag torque such as the lubricating oil temperature, the depth of the groove, the average gap between the friction plates were also discussed. Simulation was carried out in Matlab/Simulink,. Simulation results were compared with experiment results. This study may provide a reference for theoretical study and structural design of wet clutch.

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