Pumps – Combined
Patent
1993-02-22
1994-11-01
Gluck, Richard E.
Pumps
Combined
4174101, F04B 2100
Patent
active
053603222
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is related to a hydraulic pump driven by an electric motor in which the control apparatus, the electric motor and the hydraulic pump section are accommodated within a housing. A similar pump which serves as a fuel transfer pump is known from the German published patent application No. 3,700,664 A1. This pump is housed in a fuel tank which has a relatively large space, consequently, the pump is not particularly space-saving as to its set-up. In particular, a large filter is arranged beside the pump.
In other hydraulic pumps which supply hydraulic pressure fluid, for example, a power steering system or an anti-lock device in automotive vehicles, a compact structure is of special importance due to the restricted space which is available in for example the engine compartment.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to configurate a hydraulic pump being driven by an electric motor in such a way that it requires distinctly less space than state-of-the-art pumps and offers, moreover, ease of mounting due to an integration of all elements.
The invention provides a hydraulic pump having a housing that accommodates the control apparatus, the electric motor, the hydraulic pump section, a tank, a resonator if used and a filter if used. The hydraulic section, the electric motor and the control apparatus, which includes an electrical connector are formed in modules and are adapted to be joined together. This structure is inexpensive to manufacture.
According to a further object of this invention, the hydraulic section and the control apparatus, to which the motor brushes are fixed as well as the electric connection, constitute a pre-assembled unit to which the electric motor can be joined. This guarantees, in addition, a good cooling of the control apparatus by the hydraulic pressure agent since the control apparatus and the hydraulic section are positioned directly beside each other.
A still more compact type of construction results when the electric motor is a motor without commutator since this type of motor is smaller than a commutator motor.
It is a further object of the present invention to position the rotor of the electric motor in the hydraulic fluid. This affords the telescoping of various component parts since any separation of the electric motor and the hydraulic section is dropped. The saving of the pump-side bearing of the rotor of the motor also means a reduction in size and of costs of the motor-and-pump assembly.
In another preferred embodiment, the control apparatus is integrated into the electric motor, respectively into a portion of its housing.
Advantageously, the pump is preferably designed in the shape of a slot-controlled radial piston pump with an optimum utilization of space being achieved by an expedient arrangement of the supply and discharge ducts as well as of the filters.
The inventive pump is provided for use in a hydraulic system of an automotive vehicle, in particular in an electrohydraulic power steering system, in a brake unit with slip control or in a hydraulic chassis control system.
In the following, the invention will be described making reference to a plurality of embodiments which are illustrated in the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a hydraulic system in which all elements are accommodated within a sub-divided housing;
FIG. 2 shows a hydraulic pump in which the control apparatus is arranged between the hydraulic section and the electric motor;
FIG. 3 shows the assemblage of the modules in an exploded view;
FIG. 4 shows a motor-and-pump assembly with a motor without commutator;
FIG. 5 shows another motor-and-pump assembly with a dipped motor; and
FIG. 6 shows an extremely compact arrangement of the motor without commutator with integrated control apparatus, common bearing of the rotors of the motor and pump and filter in the motor range.
DETAILED DESCRIPTION OF THE INVENTION
For simplicity sake identical elements are given identical reference numerals, and o
REFERENCES:
patent: 4684329 (1987-08-01), Hashimoto
patent: 4834623 (1989-05-01), Triolo et al.
patent: 4838769 (1989-06-01), Gannaway
patent: 4854829 (1989-08-01), Stanzani et al.
Beer Wilhelm
Henein Nabil
Vile David
Alfred Teves GmbH
Basichas Alfred
Gluck Richard E.
Lewis J. Gordon
Seitter Robert P.
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