US20070274848A1 - Motor-pump assembly - Google Patents
Motor-pump assembly Download PDFInfo
- Publication number
- US20070274848A1 US20070274848A1 US11/584,134 US58413406A US2007274848A1 US 20070274848 A1 US20070274848 A1 US 20070274848A1 US 58413406 A US58413406 A US 58413406A US 2007274848 A1 US2007274848 A1 US 2007274848A1
- Authority
- US
- United States
- Prior art keywords
- pump
- motor
- rotor
- electric motor
- pump assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims 1
- 230000002706 hydrostatic effect Effects 0.000 description 8
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- 238000004804 winding Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/02—Pumping installations or systems having reservoirs
- F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
Definitions
- the invention relates to a motor-pump assembly.
- Such pump assemblies and similar pump assemblies are known from countless documents. See, for example, EP 0 611 887 A1 or WO 01/73295.
- an electric motor and a hydrostatic pump are enclosed in a single housing. The pump liquid flows through the motor to cool it.
- 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.
- 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.
- the inventor has recognized the following:
- 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.
- FIG. 1 shows a motor-pump assembly according to the invention in an axial section.
- FIG. 2 shows a motor-pump assembly according to DE 100 15 139 A1, likewise in an axial section.
- 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.
- a hydrostatic pump 2 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.
- 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.
- a sliding bearing 3 . 1 is provided between the bearing axis 3 and the rotor 1 . 1 of the electric motor 1 .
- the electric motor 1 and the hydrostatic pump 2 are arranged inside of a housing 4 .
- the housing 4 has a cylindrical casing 4 . 1 and, in addition, a motor-end cover 4 . 2 and a pump-end cover 4 . 3 .
- the bearing axis 3 is fixed to the motor-end cover 4 . 2 by shrinkage fitting. Other fastening possibilities are also conceivable.
- the rotor 1 . 1 of the electric motor 1 is in driven connection with the shaft 2 . 1 of the hydrostatic pump 2 , namely, via a driver plate 1 . 3 , which is joined to the rotor 1 . 1 of the electric motor 1 in a rotationally resistant manner.
- the left end of the shaft 2 . 1 of the hydrostatic pump can also be mounted on the opposite-lying face of the fixed bearing axis.
- the bearing can be of any kind, for example, a sliding bearing or a roller bearing.
- the bearing axis 3 could have an open-edged, pot-like recess in its end region, in which engages the left end, shown in the figure, of the shaft 2 . 1 of the pump 2 .
- the housing 4 has an inlet for medium 5 as well as a medium outlet 6 .
- This medium is generally an oil. However, it can also be any other medium and thus, for example, a different liquid.
- FIG. 2 shows a motor-pump assembly according to the prior art. It comprises an electric motor 1 having a rotor 1 . 1 and a stator 1 . 2 .
- the stator 1 . 2 has stator plates 1 . 2 . 1 and a winding 1 . 2 . 2 .
- the rotor 1 . 1 has a pot shape and is U-shaped as viewed in the axial section.
- a pump 2 Arranged radially inside of the rotor 1 . 1 and of the stator 1 . 2 is a pump 2 . As is seen, this pump 2 is completely enclosed by the rotor 1 . 1 or the stator 1 . 2 , respectively, of the electric motor 1 .
- the arm 1 . 1 . 1 of the rotor 1 has a bore with inner teeth, which mesh with the outer teeth of the pump shaft 2 . 1 .
- the pump shaft 2 . 1 has a pinion gear 2 . 2 , which meshes with an internal geared wheel 2 . 3 , which is arranged eccentrically to the pinion gear 2 . 2 inside of the rotor 1 . 1 of the electric motor 1 .
- a pump medium inlet 5 in an end face of the housing 4 .
- a pump medium outlet 6 in the same end face of the housing.
- the medium drawn into the inlet 5 flows through the electric motor 1 and thereby cools it. It then enters axially or radially into the hydrostatic pump 2 , flows through it, and is carried from the outlet 6 to a consuming device.
- the noise behavior of the pump is extremely favorable. In operation, it is substantially quieter than known pumps.
- the use of the rigid bearing axis 3 allows a reduction in the outer diameter of the assembly by approximately 20%. Moreover, it is possible, on account of the dimensions that thereby result, to use a standard rotor with a standard rotor winding as the rotor 1 . 1 , which leads to cost savings.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
- This application claims the benefit under 35 U.S.C. §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.
- 1. Field of the Invention
- The invention relates to a motor-pump assembly.
- 2. Description of Related Art
- 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.
- 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.
- 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.
- 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.
- 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.
- The inventor has recognized the following:
- 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.
- 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.
- 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.
- 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.
- 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:
-
FIG. 1 shows a motor-pump assembly according to the invention in an axial section. -
FIG. 2 shows a motor-pump assembly according to DE 100 15 139 A1, likewise in an axial section. - 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. - Provided axially adjacent to the electric motor 1 is a
hydrostatic pump 2. The axes of the electric motor 1 and thehydrostatic pump 2 are aligned with each other. - The rotor 1.1 of the electric motor 1 is mounted on a
bearing axis 3. Thebearing axis 3 is resistant to rotation and rigid; that is, it does not turn. Here, a sliding bearing 3.1 is provided between thebearing axis 3 and the rotor 1.1 of the electric motor 1. - The electric motor 1 and the
hydrostatic pump 2 are arranged inside of a housing 4. The housing 4 has a cylindrical casing 4.1 and, in addition, a motor-end cover 4.2 and a pump-end cover 4.3. Thebearing axis 3 is fixed to the motor-end cover 4.2 by shrinkage fitting. Other fastening possibilities are also conceivable. - The rotor 1.1 of the electric motor 1 is in driven connection with the shaft 2.1 of the
hydrostatic pump 2, namely, via a driver plate 1.3, which is joined to the rotor 1.1 of the electric motor 1 in a rotationally resistant manner. - The left end of the shaft 2.1 of the hydrostatic pump can also be mounted on the opposite-lying face of the fixed bearing axis. The bearing can be of any kind, for example, a sliding bearing or a roller bearing. Thus, the
bearing axis 3 could have an open-edged, pot-like recess in its end region, in which engages the left end, shown in the figure, of the shaft 2.1 of thepump 2. - The housing 4 has an inlet for
medium 5 as well as amedium outlet 6. - The arrows indicate the flow of the medium. This medium is generally an oil. However, it can also be any other medium and thus, for example, a different liquid.
-
FIG. 2 shows a motor-pump assembly according to the prior art. It comprises an electric motor 1 having a rotor 1.1 and a stator 1.2. The stator 1.2 has stator plates 1.2.1 and a winding 1.2.2. The rotor 1.1 has a pot shape and is U-shaped as viewed in the axial section. - Arranged radially inside of the rotor 1.1 and of the stator 1.2 is a
pump 2. As is seen, thispump 2 is completely enclosed by the rotor 1.1 or the stator 1.2, respectively, of the electric motor 1. - In order to create a driven connection between the rotor 1.1 and the pump shaft 2.1, the arm 1.1.1 of the rotor 1 has a bore with inner teeth, which mesh with the outer teeth of the pump shaft 2.1. The pump shaft 2.1 has a pinion gear 2.2, which meshes with an internal geared wheel 2.3, which is arranged eccentrically to the pinion gear 2.2 inside of the rotor 1.1 of the electric motor 1. Arranged axially on both sides of the internal geared wheel 2.3 are side plates 2.4 and 2.5 of the
pump 2, in which the pump shaft 2.1 is mounted on sliding bearings 2.4.1 and 2.5.1 so as to rotate. - Provided for supplying the pump medium is a pump
medium inlet 5 in an end face of the housing 4. Provided for discharging the pump medium is a pumpmedium outlet 6 in the same end face of the housing. - The medium drawn into the
inlet 5 flows through the electric motor 1 and thereby cools it. It then enters axially or radially into thehydrostatic pump 2, flows through it, and is carried from theoutlet 6 to a consuming device. - The noise behavior of the pump is extremely favorable. In operation, it is substantially quieter than known pumps.
- The use of the
rigid bearing axis 3 allows a reduction in the outer diameter of the assembly by approximately 20%. Moreover, it is possible, on account of the dimensions that thereby result, to use a standard rotor with a standard rotor winding as the rotor 1.1, which leads to cost savings. -
- 1 electric motor
- 1.1 rotor
- 1.1.1 arm of the rotor
- 1.2 stator
- 1.2.1 stator plates
- 1.2.2 winding
- 2 pump
- 2.1 pump shaft
- 2.2 pinion gear
- 2.3 internal geared wheel
- 2.4 side plate
- 2.4.1 sliding bearing
- 2.5 side plate
- 2.5.1 sliding bearing
- 3 bearing axis
- 3.1 sliding bearing
- 4 housing
- 4.1 housing casing
- 4.2 motor-end cover
- 4.3 pump-end cover
- 5 medium inlet
- 6 medium outlet
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005050737.9 | 2005-10-22 | ||
DE102005050737A DE102005050737B3 (en) | 2005-10-22 | 2005-10-22 | Motor-pump unit including electric motor and pump formed within same housing for conveying liquid, gas or other pumping medium |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070274848A1 true US20070274848A1 (en) | 2007-11-29 |
Family
ID=36950286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/584,134 Abandoned US20070274848A1 (en) | 2005-10-22 | 2006-10-20 | Motor-pump assembly |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070274848A1 (en) |
EP (1) | EP1777411A1 (en) |
KR (1) | KR20070043919A (en) |
DE (1) | DE102005050737B3 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8622719B2 (en) | 2010-11-30 | 2014-01-07 | Mitsubishi Heavy Industries, Ltd. | Hydraulic pump structure for wind turbine generator or tidal current generator and method of mounting hydraulic pump |
US10784750B2 (en) | 2018-06-12 | 2020-09-22 | General Electric Company | Electric motor having an integrated cooling system and methods of cooling an electric motor |
US11035386B2 (en) * | 2016-09-28 | 2021-06-15 | Byd Company Limited | Motor oil pump assembly, steering system, and vehicle |
US11971024B2 (en) * | 2017-11-23 | 2024-04-30 | HAWE Altenstadt Holding GmbH | Hydraulic pressure supply unit |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008054269A1 (en) * | 2007-11-27 | 2009-05-28 | Robert Bosch Gmbh | Electrohydraulic motor pump unit |
KR102150608B1 (en) * | 2014-02-25 | 2020-09-01 | 엘지이노텍 주식회사 | Electric pump |
CN112664452B (en) * | 2020-12-21 | 2022-08-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2763214A (en) * | 1953-12-17 | 1956-09-18 | Howard T White | Motor driven pumps |
US20050214135A1 (en) * | 2004-03-26 | 2005-09-29 | Yukio Shibuya | Electric pump |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2143907B (en) * | 1983-07-25 | 1987-12-02 | Copeland Corp | Hermetic refrigeration compressor |
DD240584A1 (en) * | 1985-08-30 | 1986-11-05 | Dkk Scharfenstein Veb | CROSS-DRIVE CRANKSHAFT FOR HERMETIC COILANT COMPRESSORS |
JP2687822B2 (en) * | 1992-08-06 | 1997-12-08 | ダイキン工業株式会社 | Fluid pressure generator |
DE29519941U1 (en) * | 1995-12-15 | 1997-04-17 | Wagner, Paul-Heinz, 53804 Much | Hydraulic pump unit |
DE19728802A1 (en) * | 1997-07-05 | 1999-01-07 | Itt Mfg Enterprises Inc | Bearing arrangement for a motor-driven unit |
DE10015139A1 (en) * | 2000-03-29 | 2001-10-11 | Voith Turbo Kg | Motor pump unit |
DE10254044A1 (en) * | 2002-11-20 | 2004-06-09 | Danfoss Compressors Gmbh | Coolant compression device for freezers has rotor rotating on rotor shaft which is fixed to motor housing |
-
2005
- 2005-10-22 DE DE102005050737A patent/DE102005050737B3/en not_active Expired - Fee Related
-
2006
- 2006-06-08 EP EP06011808A patent/EP1777411A1/en not_active Withdrawn
- 2006-08-30 KR KR1020060083021A patent/KR20070043919A/en not_active Application Discontinuation
- 2006-10-20 US US11/584,134 patent/US20070274848A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2763214A (en) * | 1953-12-17 | 1956-09-18 | Howard T White | Motor driven pumps |
US20050214135A1 (en) * | 2004-03-26 | 2005-09-29 | Yukio Shibuya | Electric pump |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8622719B2 (en) | 2010-11-30 | 2014-01-07 | Mitsubishi Heavy Industries, Ltd. | Hydraulic pump structure for wind turbine generator or tidal current generator and method of mounting hydraulic pump |
US11035386B2 (en) * | 2016-09-28 | 2021-06-15 | Byd Company Limited | Motor oil pump assembly, steering system, and vehicle |
US11971024B2 (en) * | 2017-11-23 | 2024-04-30 | HAWE Altenstadt Holding GmbH | Hydraulic pressure supply unit |
US10784750B2 (en) | 2018-06-12 | 2020-09-22 | General Electric Company | Electric motor having an integrated cooling system and methods of cooling an electric motor |
US11885229B2 (en) | 2018-06-12 | 2024-01-30 | General Electric Company | Electric motor having an integrated cooling system and methods of cooling an electric motor |
Also Published As
Publication number | Publication date |
---|---|
DE102005050737B3 (en) | 2007-01-04 |
KR20070043919A (en) | 2007-04-26 |
EP1777411A1 (en) | 2007-04-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: VOITH TURBO GMBH & CO. KG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ARBOGAST, FRANK;SCHELP, STEPHAN;NAGEL, GUENTHER;REEL/FRAME:018775/0567 Effective date: 20061214 |
|
AS | Assignment |
Owner name: VOITH TURBO GMBH & CO. KG, GERMANY Free format text: RE-RECORD TO CORRECT THE NAME OF THE FIRST ASSIGNOR, PREVIOUSLY RECORDED ON REEL 018775 FRAME 0567.;ASSIGNORS:ARBOGAST, FRANZ;SCHELP, STEPHAN;NAGEL, GUENTHER;REEL/FRAME:019001/0696 Effective date: 20061214 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |