US 9,810,305 B2
Gearing device with secondarily coupled power split
Jürgen Legner, Friedrichshafen (DE)
Assigned to ZF Friedrichshafen AG, Friedrichshafen (DE)
Appl. No. 14/777,866
Filed by ZF Friedrichshafen AG, Friedrichshafen (DE)
PCT Filed Feb. 18, 2014, PCT No. PCT/EP2014/053051
§ 371(c)(1), (2) Date Sep. 17, 2015,
PCT Pub. No. WO2014/146839, PCT Pub. Date Sep. 25, 2014.
Claims priority of application No. 10 2013 204 747 (DE), filed on Mar. 19, 2013.
Prior Publication US 2016/0281831 A1, Sep. 29, 2016
Int. Cl. F16H 47/04 (2006.01); F16H 61/421 (2010.01); F16H 61/431 (2010.01); F16H 37/08 (2006.01); F16H 39/00 (2006.01)
CPC F16H 47/04 (2013.01) [F16H 61/421 (2013.01); F16H 61/431 (2013.01); B60Y 2304/01 (2013.01); F16H 2037/0866 (2013.01); F16H 2037/0873 (2013.01); F16H 2039/005 (2013.01); F16H 2047/045 (2013.01); F16H 2200/2005 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A transmission device (1) with secondarily coupled power spatting, wherein drive torque is transmitted to the transmission device by a transmission input and a first part of the drive torque is conducted in a first power branch (3) at least by way of a hydrostatic system (4) and another part of the drive torque is conducted in a second power branch (5), between the transmission input (7) and a transmission output (8), via a mechanical system (6);
the hydrostatic system (4) of the first power branch (3) comprises at least one pump (12) and at least one motor (13) functionally connected thereto by way of a hydraulic circuit, the at least one pump having a delivery volume per revolution thereof that is less than a displacement volume of the at least one motor per revolution thereof;
both of the at least one pump (12) and the at least one motor (13) are adjustable by a yoke;
the first and the second power branches (3, 5) are summable by a summing gear system (9);
the summing gear system (9) is a planetary gear assembly having first, second and third shafts (22, 23, 24) that are aligned along an axis, the first shaft (23) of the planetary gear assembly (9) is functionally connected to the transmission input (7), the second shaft (22) of the planetary gear assembly (9) is functionally connected to the pump (12) and the third shaft (24) of the planetary gear assembly (9) is functionally connected to the motor (13) and the transmission output (8), and
the transmission device has only one transmission ratio range, and a transmission ratio within the transmission ratio range is continuously variable by the hydrostatic system (4).