Zf Friedrichshafen Ag

Berron Hairston

Horst Leichsenring

Bradford White

Thomas Aisenpreis

Jochen Birkle

A power take-off unit ('PTO') may include a retarder to reduce noise while the transmission PTO output gear is operating at low torque. The retarder may variably load the PTO based on the PTO output load, while disengaging from the PTO while the PTO is not operational. The retarder may also serve as a primary retarder function to slow a vehicle's speed. The retarder may be controlled by a vehicle operator or by a processor.

PTO with integrated retarder

A power take-off unit ('PTO') may include a damper to reduce noise while the PTO is operating at low torque or at low RPM. The damper may also be located in the transmission before the PTO driver gear. A method may be used to systematically measure the frequency and/or amplitude of the vibrations that cause noise and to adjust the damping constant of a damper to reduce the noise.

Transmission with integrated PTO input gear damper

A hydraulic circuit arrangement for operating a hydrodynamic torque converter () with a converter bridging clutch (). The circuit arrangement comprises a hydraulic switching unit () having at least one valve for controlling an inflow flow and a return flow of oil to the converter () and the converter bridging clutch (), an oil cooler (), a first line () for acting upon the converter bridging clutch () with an engagement pressure (P) and a second line () for acting upon the converter bridging clutch () with a disengagement pressure (P). The circuit arrangement comprises a bypass line () which is connected directly with the oil cooler () so as to bypass the hydraulic switching unit ().

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Greenville, SC, United States of America

Berron Hairston