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
1990-09-26
1994-01-11
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 79, 475218, 475219, 475279, 475290, 475296, 475330, F16H 4704
Patent
active
052776700
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a load change-over gear with infinitely variable transmission that includes a power distributing linkage gear and a control gear, preferably made in the form of a hydrostatic unit. The linkage gear comprises planetary gear sets and two linkage shafts on the power take-off side whose rpm's at a control-range boundary of the control gear are equal. In case of an adjustment of the control gear in the direction of control-range boundary, the rpm of one linkage gear will increase steadily and the rpm of the other linkage gear will decrease steadily, allowing the linkage gears to be alternately coupled to the control gear. The linkage gears can be alternately connected via clutches with an input shaft of a superposition gear in which it is possible to superpose on the input shaft rpm an rpm that is in a ratio to the main drive shaft rpm which can be altered constantly or gradually and where a linkage gear of the superposition gear can be coupled directly to the output shaft of the circuit change-over gear.
BRIEF DESCRIPTION OF THE PRIOR ART
A change-over gear of the kind mentioned above is known from U.S. Pat. No. 4,232,568 as shown in FIG. 5 thereof. Two coaxial linkage shafts of the linkage gear--constructed as a four-shaft planetary gear--whose transmission to the main drive shaft can be adjusted in an infinitely variable manner, are connected within the entire operating range of the load change-over gear either alternately with an input member such as a sun wheel or directly with an output shaft of the load change-over gear. A main drive shaft here drives a carrier of the superposition gear while a power output linkage gear of the superposition gear is connected with an internal ring gear of the superposition gear.
The linkage gear includes two planetary gear sets whose sun wheels in each case can be driven by the control gear, while the rpm of the main drive shaft acts upon an internal ring gear of the first planetary gear set and a carrier of the second planetary gear set. A first linkage shaft of the linkage gear is connected with the carrier of the first planetary gear set and a second linkage gear immediately thereafter adjoins the internal ring gear of the second planetary gear set.
This prior structure of the linkage gear is relatively complicated and leads to relatively large structural dimensions of the load change-over gear. Besides there are unfavorable control output influences because the entire speed range of the circuit change-over gear is covered by four control ranges.
The present invention was developed to create a compact structural arrangement of a load change-over gear where one can provide a structurally favorable arrangement of the linkage gear and where the entire speed range of the circuit change-over gear is subdivided into several control ranges of the linkage gear.
SUMMARY OF THE INVENTION
According to the invention, the linkage gear includes a double-planetary stage from which, in each case, a planetary wheel is operationally connected via a sun wheel with an output shaft of the control gear and via a hollow wheel or internal ring gear with the first linkage gear. The other planetary wheel of the double planetary stage engages a second sun wheel of the second linkage shaft. The common carrier of the double planetary stage is driven by the main drive shaft. Thus, a four-shaft linkage gear is provided with only one carrier and, in case of a compact design of the linkage gear, one can achieve rpm's on the linkage shafts which, in the control gear, lead to load-free speed change without traction force interruption. The input shaft is extended beyond the superposition gear, whereby--via this extension of the input shaft--at least one planetary wheel stage of a control gear can be driven.
According to an alternate embodiment, the problem is solved by including a double planetary stage for which one set of planetary wheels can be operationally connected via an internal ring gear with the first linkage shaft and via a sun wheel
REFERENCES:
patent: 3446092 (1969-05-01), Moan
patent: 4164155 (1979-08-01), Reed et al.
patent: 4164156 (1979-08-01), Reed
patent: 4232568 (1980-11-01), Maeda
patent: 4341131 (1982-07-01), Pollman
patent: 4382392 (1983-05-01), Meyerle et al.
patent: 4754664 (1988-07-01), Dick
patent: 4763543 (1988-08-01), Harada et al.
patent: 5080637 (1992-01-01), Tenberge et al.
patent: 5113723 (1992-05-01), Ishino et al.
Looman, Johannes, Toothed Gearing, 2d Ed., Springer-Verlag Berlin Heidelberg New York, London, Paris, Tokyo 1988.
Braun Leslie A.
Henn David E.
Zahnradfabrik Friedrichshafen AG.
Zalkind Albert M.
LandOfFree
Circuit change-over gear with infinitely variable transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit change-over gear with infinitely variable transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit change-over gear with infinitely variable transmission will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1628010