Abstract
The drag torque losses of multiple disc wet clutches and brakes account for approximately 30% of the friction losses in an automatic transmission. To investigate the mechanism producing drag torque, measurements were made of the oil film pressure on the facings of multiple disc wet brakes and the oil film was studied visually. The results indicated that the relationship between drag torque and rotational speed can be divided into three stages : a laminar flow region, cavitation region and starved region. The effects of the oil temperature, clutch pack clearance and oil flow rate on drag torque were also examined. In the laminar flow region, the drag torque characteristics of multiple disc wet brakes were nearly equal to those of parallel rotational discs. In addition, calculations of the drag torque of multiple disc wet brakes showed general agreement with the experimental data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
