US 11,865,908 B2
Dual transmission with triangularly arranged gear center positions
Mathias Lutz, Tübingen (DE); Klaus Kalmbach, Mössingen (DE); Markus Lee, Nürtingen (DE); and Fabian Kelch, Stuttgart (DE)
Assigned to HOFER POWERTRAIN INNOVATION GMBH, Nürtingen (DE)
Appl. No. 17/625,183
Filed by HOFER POWERTRAIN INNOVATION GMBH, Nürtingen (DE)
PCT Filed Jul. 9, 2020, PCT No. PCT/EP2020/069431
§ 371(c)(1), (2) Date Jan. 6, 2022,
PCT Pub. No. WO2021/005175, PCT Pub. Date Jan. 14, 2021.
Claims priority of application No. 20 2019 103 770.9 (DE), filed on Jul. 9, 2019; application No. 20 2019 103 771.7 (DE), filed on Jul. 9, 2019; application No. 20 2019 103 778.4 (DE), filed on Jul. 9, 2019; and application No. 20 2019 103 781.4 (DE), filed on Jul. 9, 2019.
Prior Publication US 2022/0281303 A1, Sep. 8, 2022
Int. Cl. B60K 1/02 (2006.01); B60K 17/12 (2006.01); F16H 37/06 (2006.01); F16H 1/22 (2006.01); F16H 57/00 (2012.01); F16H 57/023 (2012.01); F16H 57/027 (2012.01); B60K 7/00 (2006.01)
CPC B60K 1/02 (2013.01) [B60K 17/12 (2013.01); F16H 1/22 (2013.01); F16H 37/065 (2013.01); F16H 57/0031 (2013.01); F16H 57/023 (2013.01); F16H 57/027 (2013.01); B60K 2007/0061 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dual transmission comprising input shafts, output shafts, a transmission case and two separate single transmissions arranged in the transmission case,
wherein the dual transmission is configured for being arranged in a powertrain of a motor vehicle with at least two electric machines for propulsion by being configured to be driven by the two electric machines via the input shafts and by being configured to drive one separate wheel of the motor vehicle by each output shaft, each single transmission providing a speed reduction,
wherein each single transmission is a two-stage spur gear transmission with three positions for gear centers, a first position of the three positions being occupied by one of the input shafts and a second position of the three positions being occupied by one of the output shafts,
wherein the input shafts and the output shafts are arranged in a middle region of the dual transmission and extend transversely to a case longitudinal direction of the transmission case,
wherein an arrangement of the input shafts and output shafts defines a reference plane within the transmission case,
wherein a third position of the three positions is for a middle stationary axle fixed to the transmission case and configured to stiffen the transmission case, the middle stationary axle being arranged in angular alignment to the reference plane,
wherein the first, second and third position are each at a distance from a transmission case bottom, the distance of the third position being greater than the distance of the first position and the second position,
wherein the first, second and third position define a triangular arrangement having a first side defined by a distance between the first position and the second position, a second side defined by a distance between the first position and the third position, and a third side defined by a distance between the second position and the third position,
wherein the first side is a longest side of the triangular arrangement and rests on the reference plane, and the second side and the third side form respective angles with the first side and thus with the reference plane, at least one of said angles being selected from a range between 5° and 70°.