Pumps – Three or more cylinders arranged in parallel – radial – or... – Radial cylinders
Patent
1996-02-07
1997-05-06
Gluck, Richard E.
Pumps
Three or more cylinders arranged in parallel, radial, or...
Radial cylinders
417470, F04B 104, F04B 906, F04B 904
Patent
active
056264666
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a radial piston pump as as set from therein of the kind already known from German Patent Disclosure DE-A1 37 01 857. In that reference, a ring device is provided as the actuating element; on one side of its axial length it is supported on a ball bearing, which in turn is fixed on an eccentric element on the free end of a drive shaft. The known ring device fits over a stublike housing part into which the pump cylinders are radially machined, with pump pistons emerging radially outward from them and there coming to rest on the ring device via cuplike formations. When the eccentric element is driven, the ring device executes a tumbling eccentric motion, in the course of which the pump pistons are moved alternately inward or outward and in so doing execute their intake and supply strokes. In this embodiment of a radial piston pump, although compared with known versions in which the pump pistons slide via centrally located cam races the transferring motions between the actuating element and the pump piston are relatively slight, nevertheless they are still not entirely prevented in the known embodiment. In particular, depending on the rotary position of the ring device, the pump pistons each assume positions in which they are not at right angles to the inside surface of the driving ring device. As a result, there are still shear forces at the point of contact of the pump pistons with the ring device and sliding friction, since because of the construction the surface of the ring device shifts relative to the pump pistons. The known radial piston pump is contemplated in particular for supplying a hydraulic anti-lock brake system; as the medium to be pumped, pressure fluid can be chosen, which within limits has more lubricant properties. However, if such a pump is to be used to generate pressure in media which have from only slight to no lubricating properties, such as gasoline, then high sliding friction must be expected in the contact regions between the pump pistons, leading on the one hand to increased power loss when the radial piston pump is driven and on the other to increased wear. Because of abrasion of material and scuffing with a strong draft on the driving side of the pump pistons, a considerably limited service life must be expected. Pumps that are exposed to gasoline in this region behave as if they were run dry when lubricated.
ADVANTAGES OF THE INVENTION
The radial piston pump of the invention has the advantage over the prior art that by the drive of the piston pump via a flexible transmission element in each case, sliding friction between the pump piston and its actuating element is precluded entirely. No sliding friction occurs, and hence friction losses and wear are averted. The pump thus becomes highly suitable for pumping fuel, especially gasoline, which is fed at high pressure into a pressure reservoir from which the fuel is supplied under electrical control to a fuel injection nozzle by way of which the fuel is injected into an internal combustion engine.
With the embodiment as set forth herein the advantage is attained in particular that because of the transmission element and the transmission part together with the annular part, a longitudinally symmetrical quadrilateral is formed that can be shaped into a parallelogram without the presence of ring joints that involve sliding friction. Because the annular part is rotatably supported on the eccentric element, the relative association of the alignment of the transmission part and the alignment of the annular element upon a deflection thereof via the eccentric element is preserved. With the embodiment set forth a construction that is especially easy to realize is attained, in which the parts of the transmission element extending parallel to one another can be placed in face-end grooves of a part that receives the pump cylinder. Especially advantageously, a deflection arrangement on the annular part that cooperates with the transmission part is provided in order to generate the parallel
REFERENCES:
patent: 3141309 (1964-07-01), Gesell
patent: 3945766 (1976-03-01), Gelon
patent: 5004406 (1991-04-01), Kuroyanagi et al.
patent: 5333998 (1994-08-01), Yoshida et al.
Linder Ernst
Rembold Helmut
Ruoff Manfred
Gluck Richard E.
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
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