Pumps – With condition responsive pumped fluid control – Inlet throttle or stop valve
Patent
1991-01-29
1992-10-20
Bertsch, Richard A.
Pumps
With condition responsive pumped fluid control
Inlet throttle or stop valve
417273, F04B 4900, F04B 104
Patent
active
051565315
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A radial piston pump with a load regulator, inserted in a suction bore, is known already from German Published Patent Application 3734928. This load regulator includes a rotary piston which, when it is in its terminal position, releases a maximum through-flow, cross-section. When the load regulator is turned in the direction toward the other terminal position, the through-flow cross-section is diminished until a minimum value is reached. The load regulator is adjusted from the outside by means of an adjusting drive. The installation of a load regulator makes it possible to adapt the output of a radial piston pump with high accuracy to the requirements of a consumer with greatly fluctuating power consumption, for example, a hydromotor for powering the fan in motor vehicles. During actual driving operation, this results in an output saving reduced fuel consumption. This known arrangement, however, does not work in a fully satisfactory manner as regards the uniform filling of the conveyor cylinders, especially in the lower regulating range, when there is partial filling. As a result of uneven filling, pressure pulsations and noise are increased in radial piston pumps due to the specific design and type involved.
The purpose of the invention is to design the radial piston pump so that it will be able to supply the oil needed by one or more consumers over the broadest possible regulating range. Here, it should be possible to maintain uniform filling of all conveyor cylinders in case of any momentary conveying volume. This requirement is to be implemented with the least possible structural effort and only minor changes in the outside dimensions of the pump.
SUMMARY OF THE INVENTION
According to the invention, the conveyor stream in the suction bore is divided into a regulating stream and a comparatively small constant stream, whereby the sum of both streams is available for the consumers at the pump outlet. As the load regulator for the regulating stream, an inexpensive electromagnetically adjustable valve member, such as a piston slide, is installed in the suction bore. This regulating stream is available to the hydromotor of a cooling fan, and possibly, also to other consumers, over a broad span, for example, 0.3 to 10.0 dm.sup.3 /min, as required. The constant stream of 0.3 dm.sup.3 /min, for example, is used to supply a level regulation and as a lubricating stream. In this way, one can achieve a suction stream regulator for the main consumer that will depend on the requirement and that will thus save energy while the constant minimum stream required for level regulation is available at any time.
The valve member of the load regulator is guided in a borehole that intersects the suction bore, whereby this bore ends in a suction duct that runs parallel to the suction bore and that is connected to the conveyor pistons of the pump.
The valve member has a closing member for the supply of the regulating stream at its free end, facing toward the suction duct, while the suction bore, furthermore, is constantly connected to the conveyor pistons via a flow resistor borehole for the constant stream. This special arrangement facilitates a space-saving division of the conveyor stream.
The advantageous position of the valve member immediately on the cam chamber creates short current travel paths to the conveyor pistons and thus also quiet conveyor operation.
The valve member can be made as a piston slide or as a seat valve. To ensure the supply by means of the pump at any time, the valve member always releases the largest regulation cross section in case of any possible stream failure.
The space-saving housing of the load regulator is further promoted by virtue of the fact that the regulator is inserted radially with respect to the drive shaft in a housing lid.
The narrow bore for the constant stream communicates with a ring groove that is provided in the front of the housing lid and that ends in the cam chamber via several bores. The volume capacity of the ring groove is so selected that it
REFERENCES:
patent: 3994358 (1976-11-01), Smitley
patent: 4662825 (1987-05-01), Djordjevic
patent: 4968220 (1990-11-01), Filippi et al.
patent: 4990065 (1991-02-01), Otaki
Pannek Gunter
Reichenmiller Michael
Schmid Peter
Weckbrodt Klaus
Basichas Alfred
Bertsch Richard A.
Zahnradfabrik Friedrichshafen AG.
Zalkind Albert M.
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