Infinitely variable hydrostatic mechanical power shift gearbox
First Claim
1. A hydrostatic-mechanical power shift gearbox comprising:
- a continuously adjustable hydrostatic transmission comprising;
an adjustable-volume displacement-type machine for rotating a first input shaft; and
a constant-volume displacement-type machine for rotating a second input shaft;
a multi-stage planetary gearing comprising;
a slow-running coupling shaft operatively coupled to the first and second input shafts; and
a fast-running coupling shaft operatively coupled to the first and second input shafts;
an output shaft; and
a plurality of toothed-wheel pairs for selectively coupling one of the coupling shafts to the output shaft,wherein each of the coupling shafts can be separately coupled to the output shaft by at least two toothed wheel pairs, wherein transmission stage changes occur by changing between coupling shafts, andwherein the toothed wheel pairs are sized so that adjacent transmission stages exhibit the same transmission ratio during a transmission stage change, such that transmission stage changes occur at synchronous coupling shaft and toothed wheel speeds.
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Accused Products
Abstract
The gearbox includes a multi-shaft toothed-wheel planetary gearing and a continuously adjustable hydrostatic transmission having toothed-wheel auxiliary transmission stages and gear-changing clutches. The hydrostatic transmission is associated with a displacement-type machine with constant displacement volume. In the planetary gearing, one shaft forms the input shaft to which the adjustable displacement-type machine is connected. A second shaft of the planetary gearing is connected to the constant-volume displacement-type machine. Third and fourth shafts of the planetary gearing represent coupling shafts. The coupling shafts alternately act via at least two auxiliary transmission stages, also called gears, on the output shaft. The coupling shafts change their speeds in such a manner that one coupling shaft becomes steadily faster and the other one becomes steadily slower. They behave in such a manner that they exhibit equal speeds in one extreme position. In the extreme positions of the hydrostatic transmission, gear-changing clutches handle the gear change free of load and without interruption of traction force when the speeds are synchronous. The automatic transmission is controlled and regulated by electronic and hydraulic means.
53 Citations
10 Claims
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1. A hydrostatic-mechanical power shift gearbox comprising:
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a continuously adjustable hydrostatic transmission comprising; an adjustable-volume displacement-type machine for rotating a first input shaft; and a constant-volume displacement-type machine for rotating a second input shaft; a multi-stage planetary gearing comprising; a slow-running coupling shaft operatively coupled to the first and second input shafts; and a fast-running coupling shaft operatively coupled to the first and second input shafts; an output shaft; and a plurality of toothed-wheel pairs for selectively coupling one of the coupling shafts to the output shaft, wherein each of the coupling shafts can be separately coupled to the output shaft by at least two toothed wheel pairs, wherein transmission stage changes occur by changing between coupling shafts, and wherein the toothed wheel pairs are sized so that adjacent transmission stages exhibit the same transmission ratio during a transmission stage change, such that transmission stage changes occur at synchronous coupling shaft and toothed wheel speeds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification