Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid pump and motor in one of plural paths to or from...
Patent
1997-11-18
2000-03-28
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid pump and motor in one of plural paths to or from...
475 72, F16H 4704
Patent
active
060424966
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a power distribution transmission having mechanical and hydrostatic power branches, mounted in a transmission housing.
A power distribution transmission according to the preamble is known from DE-OS 42 43 018.
However, the hydrostatic-mechanical power distribution transmission disclosed in said publication has the disadvantage that due to it requiring a relatively large space with three wave trains, installation problems result particularly in vehicles used in agriculture such as farm and field tractors. This especially concerns the arrangement of the drum selector gear which is mounted upon a second shaft situated parallel to the input shaft.
Another disadvantage of the known power distribution transmission is a preset center distance between the drive shaft and the output shaft which results from the diameter of the coupling gear or of the drum selector gear so that said distance is specified to the manufacturer and cannot be changed.
In addition, with the power distribution transmission known from the cited publication, only four gearshift ranges for forward travel and two gearshift ranges for reverse travel can be obtained, that is, it is not possible to drive in reverse as quickly as forward and also the traction and the pressure forces obtainable during forward and reverse travel are of different strength which constitutes a considerable disadvantage, especially in vehicles used in agriculture.
This invention, therefore, is based on the problem of providing a power distribution transmission having one mechanical and hydrostatic power branch which, compared to the prior art, has a small installation dimension and thus requires less space within the vehicle and which allows equal forward and reverse traveling speeds.
According to the invention, this problem is solved by the fact that the coupling gear is situated upon the drive shaft and that the last planet gear set of the coupling gear can be connected with couplings K.sub.v for forward travel and K.sub.r for reverse travel, the couplings K.sub.v and K.sub.r being connectable with the output shaft.
By means of the described arrangement, it is possible from the three parallel shafts, namely, the drive shaft, the shaft for a hydrostatic unit and a constant unit, and an input shaft for the planet gear sets of the drum selector gear, which are known from the prior art, to spare one shaft by merging the input shaft and the drive shaft so that an adequately small size results for the power distribution transmission, according to the invention, and besides the distance from the drive shaft to the output shaft can be freely selected and, therefore, the power distribution transmission, according to the invention, can be installed in different types of vehicles.
At the same time, it is possible, with the described arrangement according to the invention, to obtain the same number of gearshift ranges for forward and reverse travel whereby another disadvantage of the transmission of the prior art is overcome which-as already mentioned-made available a different number of gearshift ranges for forward and reverse travel. In the power distribution transmission, according to the invention, the engine speed, therefore, can be adjusted in the forward and the reverse travel, respectively, to the same value optimal for consumption so as to obtain a specific travel speed and output power with the power distribution transmission according to the invention.
Another advantage of the arrangement, according to the invention, is the sparing of gearwheels, since a direct actuation of the drive shaft and thus also of the coupling gear is possible, for example, by a power engine.
In an advantageous development of the invention, holes can be provided in the drive shaft for supplying pressurized oil to the couplings and for supplying lube oil to the coupling gear.
By providing holes in the drive shaft, it is easily possible to supply pressurized oil to the couplings and lube oil for the coupling gear so that no additional expensive devices are needed for suppl
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Lehle Hubert
Pohlenz Jurgen
Wright Dirk
ZF Friedrichshafen AG
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