US 12,281,695 B2
Power split transmission, method of operating a power split transmission and motor vehicle with a power split transmission
Josef Häglsperger, Gangkofen (DE); Christoph Reinhard, Augsburg (DE); Josef Bauer, Nandlstadt (DE); and Robert Honzek, Oberthingau (DE)
Assigned to DZIUBA GEARS GMBH, Trossingen (DE)
Appl. No. 18/692,602
Filed by DZIUBA GEARS GMBH, Trossingen (DE)
PCT Filed Aug. 8, 2022, PCT No. PCT/EP2022/072176
§ 371(c)(1), (2) Date Mar. 15, 2024,
PCT Pub. No. WO2023/041249, PCT Pub. Date Mar. 23, 2023.
Claims priority of application No. 21197044 (EP), filed on Sep. 16, 2021.
Prior Publication US 2024/0328483 A1, Oct. 3, 2024
Int. Cl. F16H 3/66 (2006.01); F16H 39/00 (2006.01); F16H 37/08 (2006.01); F16H 37/10 (2006.01)
CPC F16H 3/666 (2013.01) [F16H 2037/088 (2013.01); F16H 2037/103 (2013.01); F16H 2039/005 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A power split transmission, comprising:
a drive shaft;
a first mechanical branch;
a planetary gear arrangement with at least two sun gears, including a large sun gear and a small sun gear, a first ring gear and a planetary web on which double planetary gears are arranged, which mesh with the sun gears and with the first ring gear, at least one of the sun gears being coupled to the drive shaft; and
a continuously variable second branch which can be connected at least partially to the first mechanical branch via the planetary gear arrangement and comprises at least two adjustable hydraulic units which can be energetically coupled to one another and can be operated in each case in both directions as a motor or pump, wherein a first hydraulic unit of the at least two hydraulic units is coupled to the first ring gear by way of a first gear wheel and a second gear wheel on an outer rim of the first ring gear; and
an output shaft which can be coupled to the drive shaft via the first mechanical branch and the second branch;
wherein the planetary gear arrangement includes a planetary reversing gear by which the direction of rotation of the first mechanical branch can be reversed;
wherein the planetary reversing gear is formed as a reversing hollow gear and has an axially adjustable shift sleeve,
wherein in a first axial position, the shift sleeve transmits the direction of rotation of the planetary web directly to a reversing planet which, in the first mechanical branch, is non-positively connected to a summing shaft by way of three gear wheels including a first gear wheel associated with a coupling shaft of the first mechanical branch and a second adjacent gear wheel,
wherein in a second axial position, the shift sleeve is directly or indirectly blocked against rotation relative to a gear housing of the power split transmission, such that the direction of rotation of the planetary web is reversed and acts with a reversed direction of rotation on the summing shaft, and
wherein the power of the first mechanical branch and the second branch are combined via the summing shaft.