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Motor-pump assemblyRelated Patent Categories: Pumps, Motor Driven, Electric Or Magnetic Motor, Rotary Motor And Rotary Nonexpansible Chamber PumpMotor-pump assembly description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070274848, Motor-pump assembly. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit under 35 U.S.C. .sctn.119(a) of German Patent Application No. 10 2005 050 737.9, filed Oct. 22, 2005, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The invention relates to a motor-pump assembly. [0004] 2. Description of Related Art [0005] Such pump assemblies and similar pump assemblies are known from countless documents. See, for example, EP 0 611 887 A1 or WO 01/73295. In these assemblies, an electric motor and a hydrostatic pump are enclosed in a single housing. The pump liquid flows through the motor to cool it. [0006] DE 197 28 802 A1 describes a motor-pump assembly provided with a fixed bearing axis that is borne by a motor-end cover of a housing. [0007] DE 295 19 941 describes a motor-pump assembly having an electric motor, comprising a rotor and a stator, and, in addition, a pump that pumps a liquid or a gas. The pump is in driven connection with the rotor of the electric motor. The electric motor and the pump are enclosed by a common housing. The housing comprises a casing as well as two face-end covers. Viewed in the direction of the axis, the pump is arranged adjacent to the electric motor such that the two are aligned with each other. [0008] Assemblies of this type of design have the great advantage that they are quiet and have a short structural length. However, there is a serious drawback: The diameter of such assemblies is relatively large. BRIEF SUMMARY OF THE INVENTION [0009] The invention is based on the problem of designing a motor-pump assembly in such a way that the outer diameter is smaller than in the known assemblies and that the noise produced is also small. [0010] The inventor has recognized the following: [0011] In the known motor-pump assemblies, as described in EP 040 187 90, for example, the position of the rotor of the electric motor is influenced by the hydrostatic pump. This can have the result that the air gap between the rotor and the stator of the electric motor is formed eccentrically. This leads to excessive radial forces. [0012] According to the invention, the electric motor and the pump are not arranged radially in each other, but rather axially adjacent to each other, so that the axes of the two are aligned with each other. A non-rotating bearing axis is also essential in accordance with the invention, and this axis is borne by the motor-end cover of the housing and is mounted on the motor of the electric motor. [0013] In such a constellation, the bearing of the rotor of the electric motor, on the one hand, and the bearing of the rotor of the pump, on the other hand, are uncoupled from each other. In no way does the shaft on which the rotor of the pump rests influence the position of the rotor of the electric motor. This leads to a quiet running. Measurements have demonstrated a favorable noise behavior. [0014] Although the arrangement of the electric motor and the pump radially adjacent to each other results in an increase in the axial length of the structure, the outer diameter of the housing is thereby reduced. Indeed, this is what is often important in practice. BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS [0015] The invention as well the prior art are described in greater detail below on the basis of the drawing. Depicted in it, in detail, is the following: [0016] FIG. 1 shows a motor-pump assembly according to the invention in an axial section. [0017] FIG. 2 shows a motor-pump assembly according to DE 100 15 139 A1, likewise in an axial section. [0018] The motor-pump assembly shown in FIG. 1 comprises an electric motor 1 having a rotor 1.1 and a stator 1.2. The stator has stator plates 1.2.1 and a winding 1.2.2. The rotor 1.1 is pot-shaped and, in the axial section shown here, it is U-shaped. [0019] Provided axially adjacent to the electric motor 1 is a hydrostatic pump 2. The axes of the electric motor 1 and the hydrostatic pump 2 are aligned with each other. [0020] The rotor 1.1 of the electric motor 1 is mounted on a bearing axis 3. The bearing axis 3 is resistant to rotation and rigid; that is, it does not turn. Here, a sliding bearing 3.1 is provided between the bearing axis 3 and the rotor 1.1 of the electric motor 1. Continue reading about Motor-pump assembly... Full patent description for Motor-pump assembly Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Motor-pump assembly patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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