US 12,359,719 B2
Method for heating a gearbox for a working machine
Tobias Dieterich, Friedrichshafen (DE); Sven Bieber, Markdorf (DE); and Anton Arnold, Tettnang (DE)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
Filed on Apr. 24, 2024, as Appl. No. 18/644,828.
Claims priority of application No. 10 2023 203 785.8 (DE), filed on Apr. 25, 2023.
Prior Publication US 2024/0360902 A1, Oct. 31, 2024
Int. Cl. F16H 57/04 (2010.01); F16H 47/06 (2006.01); F16H 59/72 (2006.01); F16H 61/00 (2006.01); F16H 61/16 (2006.01)
CPC F16H 61/16 (2013.01) [F16H 47/06 (2013.01); F16H 57/0413 (2013.01); F16H 59/72 (2013.01); F16H 61/0059 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for heating a transmission for a working machine having a plurality of hydraulically actuated shifting elements, the method comprising:
sending a closing signal for closing shifting elements of the transmission in order to block the transmission; and
pulsed actuation to open and close at least one of the closed shifting elements while the transmission remains blocked;
wherein the pulsed actuation consists in actuating, with a number of pulsed cycles for opening and closing, at least one of the plurality of hydraulically actuated shifting elements, wherein a pulse duration of the actuation decreases as a number of cycles increases.