Pumps – Motor driven – Including means utilizing pump fluid for augmenting cooling,...
Patent
1984-11-09
1987-03-10
Croyle, Carlton R.
Pumps
Motor driven
Including means utilizing pump fluid for augmenting cooling,...
417419, F04B 1700, F04B 3500, F04B 3902, F04B 3906
Patent
active
046488090
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for conveying a pressure medium including a pump driven by a shaft coupled to an electric motor.
BACKGROUND OF THE INVENTION
In a known device of this type, the electric motor is mounted on top of the housing. When the housing top is assembled with the housing bottom carrying the pump, a complete, three-dimensional, compact unit is formed. However, this conventional arrangement is noisy.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a device for conveying a pressure medium which absorbs and dampens its operational noises.
Another object of the present invention is to provide a device for conveying a pressure medium which cools the electric motor.
The foregoing objects are basically obtained by a device for conveying a pressure medium, especially oil, comprising an electric motor having a perpendicular shaft and a stator, a pump coupled to and driven by the shaft, a thick walled pump housing surrounding the pump, and a motor housing fixedly coupled to the pump housing at a first distance from it at an outside surface of the motor housing. The motor housing has pairs of longitudinal fins extending axially along and radially inwardly from the motor housing and supporting the stator. A motor cover is fixedly coupled to the motor housing. First and second bearings support the shaft and are mounted in the pump housing and the motor housing, respectively. Tie rods are located interiorly of the motor housing with each tie rod located between a respective pair of fins and connecting the motor cover to the pump housing to prevent relative rotation and movement therebetween. A housing casing surrounds the motor housing and is fixedly connected to and sealed to the pump housing. A housing cover is spaced from the motor cover and is coupled to and sealed to the housing casing. Clearances between the housing casing and the motor housing and between the motor housing and the pump housing permit fluid to flow therethrough.
Since the pump housing is constructed as a stable member of a large mass, and the electric motor as well as the pump are mounted on this pump housing, the parts producing noises during operation are connected directly with a stable housing member forming a bottom part, and the operational noises are greatly damped. By mounting the electric motor and the pump on this housing member, the total mass of this bottom part and the elements connected with it are increased thereby. A reduction in operational noises is obtained with the compact structure.
These features also permit the housing to serve as storage container. The pressure medium found in the storage container absorbs noise and simultaneously cools the electric motor. When a cup-shaped top part is changed for a top part of another size and/or shape, the storage container can be changed as desired, both in size and in shape, without requiring a change in the other parts of the device.
Other objects, advantages and salient features of the present invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses a preferred embodiment of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to the drawings which form a part of this disclosure:
FIG. 1 is a diagrammatic, side elevational view in section of a device for conveying pressure oil according to the present invention, taken along line I--I of FIG. 2; and
FIG. 2 is a diagrammatic top plan view in section taken along line II--II of FIG. 1.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
A housing 1 of the device has a pump housing or bottom part 2 constructed as a stable, heavy, thick-walled element of large mass and formed particularly of cast iron or spheroidal graphite iron. The ratio of wall thickness of part 2 to its outside diameter is between 1/30 and 1/70, preferably is between 1/40 and 1/60, especially 1/50.
A tubular housing casing 3 having an outside diameter corresponding essentially to the outside dia
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patent: 4184810 (1980-01-01), Dyhr et al.
patent: 4198191 (1980-04-01), Pierce
patent: 4201523 (1980-05-01), Olofsson
patent: 4540382 (1985-09-01), Wilson
Croyle Carlton R.
Flutec Fluidtechnische Gerate GmbH
Stout Donald E.
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