US 12,359,715 B2
Bypass for purging an oil circuit
Andy Maes, Sinaai (BE); Bert Verdyck, Friedrichshafen (DE); Stijn Rottiers, Lokeren (BE); and Wim De Laet, Antwerp (BE)
Assigned to ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
Appl. No. 18/567,373
Filed by ZF FRIEDRICHSHAFEN AG, Friedrichshafen (DE)
PCT Filed Jul. 8, 2022, PCT No. PCT/EP2022/069024
§ 371(c)(1), (2) Date Dec. 6, 2023,
PCT Pub. No. WO2023/016717, PCT Pub. Date Feb. 16, 2023.
Claims priority of application No. 10 2021 208 683.7 (DE), filed on Aug. 10, 2021.
Prior Publication US 2024/0288059 A1, Aug. 29, 2024
Int. Cl. F16H 57/04 (2010.01); F03D 15/00 (2016.01); F16H 57/02 (2012.01)
CPC F16H 57/0408 (2013.01) [F16H 57/042 (2013.01); F16H 57/0435 (2013.01); F16H 57/0452 (2013.01); F03D 15/00 (2016.05); F16H 2057/02078 (2013.01); F16H 57/0436 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A gearbox arrangement with an oil circuit, comprising:
a housing forming an oil sump;
a lubricant supply device comprising a pump, a filter, and an oil cooler;
at least one lubrication point incorporated in the oil circuit;
at least one direction control valve with at least two switching positions and at least three ports, the at least three ports including a first port, a second port, and a third port; and
a bypass extending within the housing and configured to drain oil from the third port past the at least one lubrication point into the oil sump, wherein:
in a first switching position the first port and the third port are connected to each other in an oil-conducting manner and disconnected from the second port,
in a second switching position, the first port and the second port are connected to each other in an oil-conducting manner and disconnected from the third port,
the lubrication point and the second port are connected to each other in an oil-conducting manner,
the lubrication point and the third port are not connected to each other in an oil-conducting manner, and
the entire bypass extends within the housing and the at least one direction control valve.