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The New Twin XTend - A Self-Adjusting 2 Plate 15.5″ Clutch for the US Class 8 Truck Market
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 31, 2006 by SAE International in United States
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The continuing growth of the US trucking industry has led and will continue to lead to a shortage of truck drivers and qualified mechanics. Therefore a high priority at the fleets is driver retention and reduction in maintenance.
In addition emission regulations lead to challenges in the area of drive-train vibrations induced by the new engines implemented in recent years and in the years to come to comply with the emission regulations.
High operating costs to periodically inspect and manually adjust clutches used in combination with unsynchronized transmissions, can be avoided if the clutch facing- and iron-wear could be compensated for automatically.
Using the patented ZF Sachs XTend™ self-adjust and Controlled Center Plate Technology the basis was given to develop a reliable self-adjusting clutch with consistent, “drag-free” clutch operation to lower the operating costs and to provide a clutch that is easy to operate by the driver.
This paper describes the development process of the Twin XTend Clutch (see Figure 1) starting with the studying of the market demands, the -from the demands derived- design targets, the features of the Twin XTend meeting the targets and the rig- and field testing methods validating the full functionality of the self-adjusting clutch over product life.
CitationGebauer, A., "The New Twin XTend - A Self-Adjusting 2 Plate 15.5″ Clutch for the US Class 8 Truck Market," SAE Technical Paper 2006-01-3537, 2006, https://doi.org/10.4271/2006-01-3537.
- Steinel, K. “Investigating the Fatigue Strength of Commercial-Vehicle Clutches” 973117 E SAE Brazil Sao Paulo, Brazil 1997
- Drexl, H.J. Dettmar, M. Teichert, U. “Clutch Wear Analyzing Technology: A Tool for Longer Clutch Life” 982848 SAE International Warrendale, PA 1998
- Lindner, J. Weidinger, R. “Xtend: a new concept for automatic wear compensation in clutches” 199-01-3004 E SAE Brazil Sao Paulo, Brazil 1999
- Steinel, K. “Clutch Tuning to Optimize Noise and Vibration Behavior in Trucks and Buses” 2000-01-3292 E SAE Brazil Sao Paulo, Brazil 2000
- Szadkowski, A. Morford, R. “LTD - Long Travel Damper” 2001-01-2806 SAE International Warrendale, PA 2001
- “Commercial Truck and Bus SAE recommended Procedure for Vehicle Performance Prediction and Charting” J2188 SAE International Warrendale, PA Mar 96
- “Clutch Installation and Release Linkage Requirements for Truck and Bus Application” J2407 SAE International Warrendale, PA Oct 1997
- “Clutch Application Powertrain Startability Rating Requirements for Truck and Bus Applications” J2469 SAE International Warrendale, PA Aug 2004
- “Vehicle Idle Gear Rattle Evaluation Procedure” J2555 SAE International Warrendale, PA Nov 2000
- “Effects of Drivetrain Torsionals” TMC/ATA Alexandria, VA 3 96
- “Spec'ing Drivetrains” TMC/ATA Alexandria, VA 3 93
- “Vibration and shock - Vocabulary” Geneve, Switzerland
- “Pull-Type Clutch Transmission Installation Dimensions” J1463 SAE International Warrendale, PA Apr 2003
- “(R) Automotive Pull-Type Clutch Terminology” J1479 SAE International Warrrendale, PA Sep 99
- “(R) Clutch Dimensions for Truck and Bus Applications” J1806 SAE International Warrendale, PA Nov 1999
- “Flywheel Dimensions for Truck and Bus Applications” J1857 SAE International Warrendale, PA Apr 2003
- “Heavy-Duty Clutch Maintenance Guidelines” TMC/ATA Alexandria, VA 7 99
- “Spec'ing Heavy-Duty Clutches” TMC/ATA Alexandria, VA 7 99