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
1990-09-27
1992-01-14
Braun, Leslie A.
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, 475219, 475290, 475330, F16H 4704
Patent
active
050806378
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP89/00348 filed 31 March 1989 and based, in turn, upon German National Application P 38 11 508.5 of 6 April 1988 under the International Convention.
FIELD OF THE INVENTION
The invention refers to a hydrostatic-mechanical power-distribution transmission, whose mechanical power branch as well as hydrostatic power branch are driven on the input side by a common driving shaft and on the output side are summed in a first, four-shaft coupling gear. Two coupler shafts on the output side of this coupling gear can be alternately connected with the output shaft of the power-distribution transmission, via a downstream connected three-shaft planetary gear. The first coupler shaft is in driving connection with a planet gear carrier and the second coupler shaft is in driving connection with a sun wheel of a second, three-shaft coupling gear. A hollow wheel of the second coupling gear is coupled with the output shaft via a third coupler shaft and via the downstream connected planetary gear.
BACKGROUND OF THE INVENTION
From EP-A 00 03 397 a load-shifting transmission having the above-mentioned characteristics has become known. Such a hydrostatic-mechanical power-distribution transmission presents a fine ratio subdivision, which is due to the combination possibilities of the planetary gear sets and the clutches. As a result, a good adjustment of the driving engine and working machine at favorable efficiency degrees can be achieved. In the prior-art transmission, the drawback consists in the fact that its constructive design leads to a construction unit having a relatively big axial length. A clutch between the hollow wheel of the second coupling gear and the output shaft is not provided. Besides, the clutches are arranged in the transmission in such a way that a central supply with control pressure and lubricants becomes quite cumbersome.
OBJECT OF THE INVENTION
It is the object of the present invention to improve a hydrostatic-mechanical power-distribution transmission of the aforementioned kind, so that a constructively clearly defined and easily accessible connection between the second coupling gear and the downstream connected planetary gear is created.
SUMMARY OF THE INVENTION
This basic object of the invention is achieved by arranging four clutches between the second coupling gear and the downstream connected planetary gear, through the first of these clutches the third coupler shaft can be connected with the sun wheel of the downstream connected planetary gear and through the second of these clutches the second coupler shaft can be connected with the sun wheel and through the third of these clutches the first coupler shaft can be connected with the planetary gear carrier of the downstream connected planetary gear, and through the second and fourth of these clutches, the second coupler shaft can be connected with the planetary gear carrier of the downstream connected planetary gear. The construction of the connection between the second coupling gear with the downstream connected planetary gear according to the invention leads to a particularly assembly-friendly construction unit for a total of four clutches. These clutches are arranged in pairs and arranged one after the other so that they can be centrally supplied with control pressure and lubricants.
A particularly favorable speed and torque transmission from the first four-shaft coupling gear to the second three-shaft coupling gear is achieved in a further embodiment of the invention, due to the fact that the first coupler shaft is a hollow wheel of a first planetary gear set and a planetary gear carrier of a second planetary gear set of the first coupling gear and that the second coupler shaft is a sun wheel of the first coupling gear.
It is advantageous to provide a reversing planetary gear set, whose planetary gear carrier is permanently connected with the output shaft and whose sun wheel is connected with the hollow wheel of the downstream connected gear, whereby
REFERENCES:
patent: 4164156 (1979-08-01), Reed
patent: 4184385 (1980-01-01), Maeda
patent: 4232568 (1980-11-01), Maeda
patent: 4341131 (1982-07-01), Pollman
patent: 4368653 (1983-01-01), Mizuno et al.
patent: 4754664 (1988-07-01), Dick
patent: 4763543 (1988-08-01), Harada et al.
Arain Abdul
Tenberge Peter
Braun Leslie A.
Dubno Herbert
Kateshou Yuri
Stavish Matthew
Zahnradfabrik Friedrichshafen AG
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