Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Radially disposed cylinders
Patent
1994-07-08
1995-09-26
Denion, Thomas E.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Radially disposed cylinders
92 72, F01B 106
Patent
active
054526469
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a radial piston hydrostatic motor having a cylinder spider on a shaft wherein the high and low pressure delivery channels extend from the piston bores laterally at the cylinder spider.
Such a single flow, so-called side-throw motor, is known from DE-OS 39 05 936. Provided in said motor are measures and means for absorbing and compensating for axial thrust forces acting on the cylinder spider (rotor) by way of the shaft. But it was evidenced that the axial forces are unfavorably large and that, moreover, the shaft is exposed on one side to the bending moment stemming from the radial forces, i.e., the shaft is stressed. Another problem is that the radial dimensions of the hydrostatic motor are relatively large for pumps with a large delivered volume.
The problem underlying the present invention consists in providing a hydrostatic motor of the type in which the axial (thrust) forces are, for the same delivered volume and conditions of flow, only half as large as in the prior hydrostatic motor and in which no bending moment, or at best only a minimal one, acts on the shaft.
SUMMARY OF THE INVENTION
This problem is solved by providing a cylinder spider that comprises two rotors mounted directly on the shaft with mutual spacing, the bores of the rotors having mutually communicating and mutually opposed control ports, wherein between the two rotors there is a housing partition and control discs having channels that coincide with the control ports and inlet and outlet channels in the partition.
The particular advantages of this design reside in the fact that the radial dimensions are relatively small and that a backing disk for absorption of the axial thrust forces is not needed. Overall, this provides a hydrostatic motor which, in view of its speed of rotation and efficiency as well as its stability and development of noise, constitutes a significant improvement over the prior art.
BRIEF DESCRIPTION OF THE DRAWINGS
Details of the hydrostatic motor will be more fully explained hereafter with the aid of the drawings, wherein:
FIG. 1 is a longitudinal section of the hydrostatic motor;
FIG. 2 is a cross section of the hydrostatic motor relative to FIG. 1 along line II--II; and
FIG. 3 is a cross section of the hydrostatic motor relative to FIG. 1 along line III--III.
DETAILED DESCRIPTION
The radial piston hydrostatic motor features a housing 1 with a cylindrical interior 2. The interior 2 is on both ends sealed by a cover 3, 4 and divided into two spaces 6, 7 of equal size by a circular partition 5 arranged axially centered relative to the cylindrical interior 2. Installed in the two spaces 6, 7 are bushings 8, 9, both of which are fixed jointly and relative to the housing covers 3, 4 by at least one connecting shaft 10 and bolts 11. Consisting of the functional linkage of a sliding shoe, or slider, 14 and a displacement piston 15 articulated to it, displacement elements serve the function of a hydrostatic motor or radial piston engine slide in a known fashion on the inner surfaces 12, 13 of bushings 8, 9. Pistons 15 are arranged in radial bores 16, 17 in rotors 18, 19 which form the cylinder spider and, in turn, are coupled in rotationally and axially fixed fashion to a shaft 20 driven by a drive union 20'.
The configuration described above--disregarding that nothing has been said as yet about the delivered flow or pumping function--matches the prior art insofar as rotors 18, 19 are known. The special design, however, resides in the hydrostatic motor's not being based on one rotor 18 or 19 but on two acting in synchronism with each other as a pumping unit, whereby ultimately, with identical dimensions, twice the pumping output is achievable.
In view of their function as a pumping element, rotors 18, 19 are in a mutually adapted manner coupled, or functionally joined, as follows: Facing one another, axial lateral control ports 21, 22 are provided in the radial bores 16, 17 of rotors 18, 19 so that bores 16, 17 are open toward partition 5. Control por
REFERENCES:
patent: 3044412 (1958-05-01), Orshansky, Jr.
patent: 3187681 (1965-06-01), Firth
patent: 3924516 (1975-12-01), Nelson
patent: 4131056 (1978-12-01), Rockwell
Denion Thomas E.
J. M. Voith GmbH
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