Motors: expansible chamber type – Three or more cylinders arranged in parallel radial or... – Cylinders parallel to rotation axis
Patent
1980-10-23
1984-03-06
Freeh, William L.
Motors: expansible chamber type
Three or more cylinders arranged in parallel radial or...
Cylinders parallel to rotation axis
F01B 1304
Patent
active
044347090
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an axial piston pump comprising a rotatable cylinder block within which at least one piston is mounted slidable in a cylinder and by rotation of the cylinder block is imparted a reciprocating movement, the cylinder by the rotation being brought to gradually changing communication with outlet and inlet openings in a valve or distribution plate which openings in turn are connected with exhaust and intake passages for the pumped medium.
In known hydraulic systems, especially for mobile units, ever increasing numbers of pump circuits are utilized to obtain independent functional operations under simultaneous running, i.e. one hydraulic pump together with an associated circuit is used for each single operation, and all hydraulic pumps are driven by one driving motor. As the pumps which are used have constant displacement, this arrangement implies that the entire pump volume must be circulated by pumping which means that the entire volume is caused to circulate even if no operation is desired to be effected in the circuit. Recently, systems have become available which are operated without complete reflux, which means that 20-30% only of the total volume is delivered via filter to a receptacle while the remainder of the volume is circulated by pumping in a separate circuit. Even if thus some improvement is attained with such a system, there still exists the great drawback that the circulation by pumping of the fluid, such as the hydraulic oil, requires a substantial portion of the driving motor power for a circuit which is not used for any operation. Additional drawbacks inherent to such systems are that tubing for circulation by pumping of the hydraulic fluid and the installation of a directional valve for control of the fluid flow increase the initial costs and complicate the construction. As speed requirement (great volume) does not exist simultaneously with power demand (high pressure), it is necessary, when a large power is being developed, to take charge of, and drain off, a large fluid volume, when a small volume is utilized for the generation of power.
One main object of the present invention is to provide a new type of axial piston pump preferably for hydraulic systems in which every circulation by pumping of the hydraulic fluid can be eliminated, while the same readiness for operation as with known systems is retained. Another important object of the invention is to provide a pump of said kind, the fluid volume of which can be regulated in response to load of, and output from, the pump in order to eliminate the disadvantageous effects described above.
Further objects and advantages and the characteristic features of the axial piston pump according to the invention will become apparent from the following description, considered in connection with the accompanying drawings which illustrate some preferred embodiments and form part of this specification and of which:
FIG. 1 is a diagrammatic, partly sectional side view of an axial piston pump according to the invention forming part of a circuit for control of a cylinder.
FIG. 2 is a diagrammatic view from below of a value or distribution plate of the pump in relation to the port plate of the pump housing, generally along line II--II of FIG. 1.
FIGS. 3 and 4 are views corresponding to that of FIG. 2 but with the distribution plate in other positions.
FIG. 5 is a diagrammatic, partly sectional side view of a servo mechanism for control of the pump according to the invention.
FIGS. 6 and 7 show another embodiment represented in similar manner as the preceding embodiment.
The pump shown in FIG. 1 comprises a housing 10 represented diagrammatically and enclosing a rotatably mounted drive shaft 12 with drive shaft flange 14, which drive shaft is actuated by a drive motor not shown here. Pivotably mounted in the housing is a cylinder barrel or block 16 containing at least one cylinder 18 within which a piston 20 is received for reciprocating movement. The pistons 20 are mounted in usual manner in the drive shaft flange 14, e.g., by
REFERENCES:
patent: 3808952 (1974-05-01), Knaak
patent: 3915069 (1975-10-01), Wagenseil
patent: 4007662 (1977-02-01), Deininger
Drucker William A.
Freeh William L.
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