US 10,330,186 B2Granted

Power split transmission

AssigneeDanfoss Power Solutions GmbH & Co. OHG

InventorsJens Bagusch, Torsten Kohmäscher

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Abstract

A power split transmission and a method of merging the power flows of the power split transmission are provided. A power input shaft drives a planetary gear set splitting the input power into a power flow over a variable power branch and into a power flow over a mechanical power branch. The power flows can be merged for driving a power take-off shaft. A reverser includes a first clutch, a second clutch, a first gear set and a second gear set. By engaging the first clutch and disengaging the second clutch the first gear set is driven, if an output shaft of the variable power branch and a mechanical transmission shaft are counter-rotating. By engaging the second clutch and the first clutch disengaging the second gear set is driven, if the output shaft of the variable power branch and the mechanical transmission shaft are co-rotating.

Claims20

Dependent claims

A power split transmission comprising:

a power input shaft for driving a planetary gear set splitting the input power at power input shaft into a power flow over a variable power branch having a variable transmission ratio and into a power flow over a mechanical power branch having a fixed transmission ratio,
a summation gear box configured to merge the power flows transmitted over the variable power branch and the mechanical power branch for driving a power take-off shaft,
wherein the summation gear box is a reverser comprising a first clutch configured to couple and decouple a first gear set with the power take-off shaft, and a second clutch configured to couple and decouple a second gear set with the power take-off shaft,
wherein the first gear set establishes a negative transmission ratio and the second gear set establishes a positive transmission ratio, such that the power flows over the variable power branch and the mechanical power branch are merged either by engaging the first clutch and disengaging the second clutch,
if an output shaft of the variable power branch counter-rotates with respect to a mechanical transmission shaft of the mechanical power branch, or
by disengaging the first clutch and engaging the second clutch, if the output shaft of the variable power branch co-rotates with respect to the mechanical transmission shaft of the mechanical power branch.

3 more elements

A method of merging the power flows of a power split transmission, whereas a power input shaft drives a planetary gear set splitting the input power into a power flow over a variable power branch and into a powerflow over a mechanical power branch, wherein the power flow transmitted over the variable power branch can be merged again with the power flow over the mechanical power branch for driving a power take-off shaft, wherein a reverser comprising a first clutch, a second clutch, a first gear set and a second gear set is used for merging the power flows and for driving the power take-off shaft, thereby

engaging the first clutch and disengaging the second clutch, if an output shaft of the variable power branch and a mechanical transmission shaft are counter-rotating, thereby driving the first gear set;
and
engaging the second clutch and disengaging the first clutch, if the output shaft of the variable power branch and the mechanical transmission shaft are co-rotating, thereby driving the second gear set, whose transmission ratio is opposite to the transmission ratio of the first gear set.

Dependencies are inferred from the claim text.

Facts

Application: 15/476,210Filed 31 Mar 2017
Priority: DE 10 2016 205 9338 Apr 2016
Published: US 2017/0292595 A112 Oct 2017
Granted: 25 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

F16H 47/04
The fluid gearing being of the volumetric type: the mechanical gearing being of the type with members having orbital motion
F16H 2037/0873
Power-split transmissions with distributing differentials, with the output of the CVT connected or connectable to the output shaft: with switching…
F16H
Gearing