DE102015010846B4 - Electric motor driven vacuum pump - Google Patents

Abstract

1. The invention has for its object to develop a working by means of an eccentric orbital electric motor driven vacuum pump, which is so small that they can be arranged in the space of a provided with a pulley, mechanically driven vacuum pump, and at the same time easily manufactured and manufactured can be mounted and ensures high efficiency. 2. The electric motor-driven vacuum pump according to the invention is characterized inter alia by the fact that the drive shaft (2) is mounted in only one bearing (36) by rolling elements (16) in the roller bearing ring (15) so that the drive shaft (2) the rolling bearing ring (2). 15) on the pump side with an eccentric seat (17) and on the drive side with a rotor seat (18) surmounted, and on both sides of the rolling elements (16) between the drive shaft (2) and the roller bearing ring (15) seals (19) are arranged, and the roller bearing ring (15 ) in an inner cylindrical bearing seat (21) of the bearing flange of the pump housing (1) is arranged so that the rotor seat (18) projects beyond the pump housing (1), wherein on the rotor seat (18) with a rotor shaft receiving (22) versehener, on the outer circumference Rotor cup (24) equipped with permanent magnets (23), the rotor (35), a brushless DC motor, the BLDC motor (14) is arranged so that this free-rotating cylindrical bearing flange ( 20) spaced surrounds. 3. The invention relates to an electric motor driven vacuum pump for land and air vehicles with a cylindrical working chamber in which a slide is arranged between a suction port and an outflow opening, which slides in a guide slot of an eccentric rotary piston.

Description

The invention relates to an electric motor-driven vacuum pump for land and air vehicles with a cylindrical working chamber in which a slide is arranged between a suction port and an outflow opening, which slides in a guide slot of a Exzenterdrehkolbens.

In the prior art, vacuum pumps in the design of rotary lobe pumps, in which a slider connected to the housing is slidably mounted in a piston drum driven by an eccentric, and the piston drum on the cylindrical inner wall of a working chamber pressed along slides, for example in the DE 426 755 A , of the CH 129 486 A , of the WO 2010 009603 A1 as in an earlier application of the Applicant of this solution, the DE 10 2006 016 791 B4 , described above.

The in the DE 10 2006 016 791 B4 previously described, in the meantime proven solution of a mechanically driven vacuum pump with a cylindrical working chamber, in which between a suction port and a discharge opening a slide is arranged, which slides in a guide slot of an eccentric rotary piston reaches a high vacuum even in a single-stage compression and ensures even at very high speeds a high reliability and a long service life.

This in the DE 10 2006 016 791 B4 presented solution causes a defined deformation of the Exzenterdrehkolbens, so that during the entire eccentric revolution this is always applied with a radial bias sealingly against the inner wall of the cylindrical working chamber.

In the DE 10 2012 009 419 B3 This solution was further developed by the applicant and adapted for very specific applications.

Characteristic of the aforementioned designs is that this design was mostly driven "mechanically" or "mechanically and electrically".

In the prior art, however, only electric motor driven vacuum pumps are described above.

The electric motors used are mostly asynchronous motors.

Since it is often to be avoided that the motor is arranged in the space filled with resources, a structural, hermetic separation is required, which is usually realized by a so-called split pot. This split pot is arranged either directly in the motor gap or in a magnetic coupling and consists of a material in which no or only very small eddy currents are generated by the alternating magnetic fields.

From the DE 10 2004 024 554 A1 is a rotary vane vacuum pump with an extended, simultaneously serving as a motor shaft of an asynchronous pump shaft known. In this application designs with and without containment shell are described above. The projecting into the asynchronous pump shaft inevitably causes a large-volume design. The containment shell also requires an enlargement of the motor gap, whereby the efficiency of the asynchronous motor decreases and the power consumption increases. The negative impact of the containment shell on the width of the engine gap is due to several cumulative effects. The one-sided attachment creates a tilting of the pot via a mounting flange. Therefore, the motor gap must be selected to be correspondingly large. Incidentally, the harbors in the DE 10 2004 024 554 A1 according to the 2 provided attachment over the flange, in many of the non-magnetic materials due to the uneven introduction of forces through the flange connection the risk of stress cracks with the result of destruction.

Therefore, in the DE 10 2006 022 772 A1 and the EP1 857 681 B1 a drive arrangement for a rotary vane vacuum described above, in which in addition to the vacuum pump designed as a canned motor asynchronous motor is flanged with a hermetically sealed separation between the rotor and stator components.

Also in this in the DE 10 2006 022 772 A1 and the EP1 857 681 B1 presented design is the pump shaft in its axial extension at the same time the motor shaft of an asynchronous motor, so that this design again requires a very "long" space.

In the solution after the DE 10 2006 022 772 A1 and the EP1 857 681 B1 the task was to realize the smallest possible engine gap, this was realized by a sliding bearing of the pump and motor shaft in the vacuum pump in conjunction with the arrangement of a arranged between the motor stator and the motor rotor, acting as a gap tube, cylindrical glass tube / separator realized on the edge side its outer periphery was mounted in two spaced-apart guides.

In addition to the again very "long", a large volume of construction space having this design is also characterized by a production and costly production.

In addition to these driven by asynchronous vacuum pumps is from the DE 20 10 207 A a fuel pump used in aircraft is known, which is driven by a DC brushless DC motor with AC drive.

In the DE 10 2004 021 916 A1 In addition, a vacuum pump used in aircraft is described above, which is also driven by a brushless DC motor with AC drive.

In this in the DE 10 2004 021 916 A1 the vacuum pump is shown, the drive shaft of the vacuum pump via a coupling device arranged in the shaft direction next to the vacuum pump connected to the arranged next to the clutch device in series brushless DC motor such that the coupling device is fixed to the motor shaft of the brushless DC motor by means of a collet.

But even this solution is very "long" and therefore in turn also requires, like all other solutions described in the prior art, a very large in its length dimensions space.

The brushless DC motors used in the latter solutions are particularly suitable for the DC networks in air and land vehicles, and build compared to conventional DC motors also much more compact.

In addition, the brushless DC motors compared to conventional DC motors with comparable output power a much lower weight and a much lower power consumption.

In addition, the brushless DC motors develop significantly less heat during operation than conventional DC motors with comparable output power and thus have a much higher efficiency.

In addition, in brushless DC motors neither brush nor a coal wear occur, and also caused by brush fire radio interference are excluded by means of this solution.

When in the DE 10 2004 021 916 A1 The solution presented was an external brushless DC motor with fixed windings, driven at relatively low speeds in the range between 3,000 rpm and 3,500 rpm with a high torque.

To drive a special vacuum pump with an optimum pump speed of 2,500 rpm, however, an additional gear is required in this solution, which in addition to further additional volume also requires additional manufacturing costs, and significantly increased by an additional gear, the weight of the electrically driven vacuum pump , wherein by the use of the transmission additional the efficiency of the assembly lowering friction losses occur.

The object of the invention is now an operating by means of an eccentric orbital electric motor driven vacuum pump for land and aircraft, with a cylindrical working chamber in which a slide between a suction and an outflow opening is arranged, which slides in a guide slot of an eccentric rotary, to develop which does not have the aforementioned disadvantages of the prior art, and in particular so small that they can be arranged in the space of a provided with a pulley, mechanically driven Vakuumpunpe, and at the same time is very simple and robust, with minimal material use and manufacturing technology easy can be manufactured and assembled, ensures high reliability with low friction losses and a long service life and is also characterized by a high mechanical efficiency at high volumetric efficiency.

According to the invention this object is achieved by an electric motor driven vacuum pump according to the features of the main claim of the invention.

Advantageous embodiments, details and features of the invention will become apparent from the dependent claims and from the following description, the embodiments of the invention in conjunction with the drawings for the solution according to the invention.

Hereinafter, the invention with reference to three embodiments in conjunction with four associated figures and in the 5 and 6 illustrated characteristics / maps are explained in more detail.

1 : shows a partial section of a design of the electric motor driven vacuum pump according to the Orbiterprinzip with sensors fixed to the housing 32 and a rotating, on the rotor 35 arranged magnetic ring sensor 33 for position detection of the rotor 35 ;

2 : shows a spatial representation of a design of the electric motor driven vacuum pump according to the orbiter principle with magnetic ring sensor 33 and sensors 32 and integrated ECU / control unit 34 for self-sufficient operation;

3 shows a sensorless design of the electric motor driven vacuum pump according to the Orbiterprinzip in a partial section;

4 : shows this sensorless design of the electric motor driven vacuum pump according to the Orbiterprinzip, according to 3 in a spatial explosion;

5 : shows the juxtaposition of the characteristics of the line recordings and their averages on the one hand the electric vacuum pump according to the orbiter principle (curves C and D) compared to a modern, currently used in vehicles mechanical vacuum pump without Orbiterprinzip (curves A and B) via a "New European Driving cycle "(NEDC);

6 : shows the average power consumption and the CO ₂ savings of the electric vacuum pump according to the orbiter principle with and without brake energy recovery (recuperation) compared to the conventional in the art using conventional mechanically driven vacuum pumps with and without Orbiterprinzip.

The invention, in the 1 to 4 illustrated, electric motor driven vacuum pump consists of a pump housing 1 , one in the pump housing 1 in stock 36 rotatably mounted drive shaft 2 , and one in the pump housing 1 arranged, from the pump housing 1 in connection with a pump cover 3 formed working chamber 4 with a cylindrical inner wall 5 , one on the drive shaft 2 arranged eccentric disc 6 with an eccentrically arranged on this bearing pin 7 , one rotatable on the bearing pin 7 stored, in the cylindrical inner wall 5 the working chamber 4 revolving piston drum, the orbiter 8th , with a cylinder jacket 9 one in the orbiter 8th arranged guide slot 10 , as well as one in the working chamber 4 arranged suction port 11 and one in the working chamber 4 arranged outflow opening 12 , with one between the suction port 11 and the discharge opening 12 arranged in the pump housing 1 pivotally mounted gate valve 13 in the guide slot 10 the orbiter 8th slidably mounted, sliding, and one on the drive shaft 2 arranged, the vacuum pump driving electric motor.

Essential to the invention is that the drive shaft 2 in only one camp 36 by means of rolling elements 16 in a rolling bearing ring 15 is stored so that the drive shaft 2 the rolling bearing ring 15 pump side with an eccentric seat 17 and drive side with a rotor seat 18 surmounted, and that on both sides of the rolling elements 16 between the drive shaft 2 and the rolling bearing ring 15 seals 19 are arranged.

It is also characteristic that the rolling bearing ring 15 so in an internally cylindrical bearing seat 21 one drive side rigid on the pump housing 1 arranged, cylindrical bearing flange 20 is arranged that only the rotor seat 18 the pump housing 1 surmounted.

According to the invention is also that on the rotor seat 18 one with a rotor shaft holder 22 provided, on the outer circumference with permanent magnets 23 stocked rotor pot 24 , the rotor 35 a brushless DC motor, the BLDC motor 14 , Is arranged so that this the cylindrical bearing flange 20 spaced so freely encircling that the permanent magnets 23 radially spaced in the region of the bearing seat 21 arranged, with rolling elements 16 fitted rolling bearing ring 15 to come to rest.

It is also essential that on the outside of the pump housing 1 , the bearing flange 20 Pump side on the pump housing 1 adjacent, a housing shoulder is arranged such that this in the interior of the pump housing 1 one through the wall thickness of the pump housing 1 spaced eccentric disc receiving space 26 trains in which the on the eccentric seat 17 the drive shaft 2 arranged eccentric disc 6 can circulate freely.

This arrangement according to the invention and the storage of the drive shaft 2 with the rotor pot 24 and the eccentric disc 6 in an inventive, in the 1 and 3 , illustrated, combined double row bearings with the seals 19 causes a particularly small overall axial dimension of the pump housing 1 ,

In the prior art common drive shafts of pump and electric motor are always stored in two spaced bearings.

Essential to the invention in this context is that on the pump housing 1 a housing cover enclosing the engine cover 29 is arranged, in which at a stator seat 25 the stator 27 of the BLDC motor 14 opposite the rotor pot 24 Position is positioned, wherein the stator 27 as well as the other components of the BLDC motor 14 , with the associated Verschaltungsring 28 in a motor cover 29 Positioned exactly positioned so that after fixing the engine cover 29 on the pump housing 1 , with the help of fasteners 30 , all components of the BLDC motor 14 not only accurately positioned relative to each other and with respect to the other components of the vacuum pump, but also at the same time securely and reliably fixed in their position.

The brushless (electronically commutated) DC motor, the BLDC motor 14 , is free of mechanical commutation devices. This runs very quietly, is durable and virtually maintenance-free. In regulated operation, the set speed remains constant during load and / or supply voltage fluctuations.

By the inventive use of a BLDC motor 14 With integrated electronics and appropriate control concepts, the power consumption can be further reduced. In conjunction with the high mechanical efficiency, ECUs in the vehicle are loaded significantly less.

The 1 shows a partial section of a design of the electric motor driven vacuum pump according to the invention with sensors arranged fixed to the housing 32 and a revolving, on the rotor 35 arranged magnetic ring sensor 33 (without integrated electronics, ie without the in the 2 illustrated ECU / control unit 34 ) for the position detection of the rotor 35 , The magnetic ring sensor 33 serves in conjunction with the sensors 32 ensuring safe start-up of the vacuum pump operated by an engine control unit in the motor vehicle.

The 2 shows a spatial representation of a design of the electric motor driven vacuum pump with magnetic ring sensor according to the invention 33 and sensors 32 and integrated ECU / control unit 34 for self-sufficient operation (control does not take place by means of a motor vehicle arranged in the external engine control unit). Also in this design serve the magnetic ring sensor 33 and the sensors 32 in conjunction with the integrated ECU / control unit 34 ensuring a safe startup of the vacuum pump according to the invention.

By means of in the 2 illustrated design with magnetic ring sensor 33 and sensors 32 and integrated electronics, ie with an ECU / control unit 34 , the power consumption, compared to that in the 1 illustrated design and compared to in the 3 and 4 sensor-less design shown, ie types without integrated electronics, be lowered again.

The 3 and 4 show a sensorless design of the electric motor driven vacuum pump according to the invention without integrated ECU / control unit 34 , This electric motor-driven vacuum pump according to the invention is controlled by an external engine control unit arranged in the motor vehicle.

The 3 shows this sensorless design in a partial section, and 4 shows this sensorless design in a spatial exploded view.

In this in the 3 and 4 sensor-less control shown, the rotor position is detected by the induced phase voltage at zero crossing of the non-energized motor windings. The zero crossing is nothing more than information about the current position of the rotor 35 and tells the controller when to switch to the next phase, ie when the next commutation is to take place using pulse width modulation.

By a sensorless commutation of the brushless DC motor without integrated electronics, with the inventive solution also again a significant cost reduction and at the same time a further, associated significant reduction in space (especially the overall length) of at least 20%, compared to those in the 1 and 2 Solutions of the invention shown can be achieved.

The in the 3 and 4 illustrated design of the solution according to the invention for sensorless operation is therefore a preferred variant.

By means of in the 1 to 4 illustrated arrangement according to the invention has succeeded in working by means of an eccentric orbital electric motor driven vacuum pump for land and aircraft, with a cylindrical working chamber in which between a suction port and a discharge opening a slide is arranged, which slides in a guide slot of an eccentric rotary piston to develop builds so small that they can be arranged in the space of a pulley, mechanically driven vacuum pump, and at the same time very simple and robust, and with minimal material use and manufacturing technology can be easily manufactured and assembled, high reliability at low Ensures friction losses and long service life and is characterized by high volumetric efficiency also by a very high mechanical efficiency.

It is also characteristic that the Rotortopf 24 is formed in one piece from a soft magnetic material.

As a result, this, despite its complicated shape (see 1 and 3 ), on the drive shaft 2 be mounted without, as usual, additional holding elements connect the rotor laminations with the shaft. This can be cost for the steps of fitting and assembling for mounting the rotor 35 and space can be saved.

The one-piece construction of the Rotortopfes 24 reduces the assembly effort in the manufacture of the electric orbital vacuum pump according to the invention.

The Rotortopf 24 According to the invention is designed so that it surrounds the bearing spaced. As a result, the axial length of the entire vacuum pump according to the invention is significantly reduced.

Preferably, the rotor pot 24 formed by a homogeneous soft magnetic sintered part. By selecting the soft magnetic metallurgical powder as the starting material of this sintered part, the rotor pot 24 , becomes a soft-magnetic starting body for producing a dimensionally stable rotor pot 24 for fixing on the rotor seat 18 the drive shaft 2 and for receiving the permanent magnets 23 provided.

Furthermore, it is characteristic that the rolling bearing ring 15 of the camp 36 in the cylindrical bearing flange 20 is only pressed, ie that frontally on the camp 36 with the rolling bearing ring 15 no position securing elements are arranged against axial displacements.

In the case of conventional vacuum pumps described above in the state of the art, a bearing pressed in excessively only has the disadvantage that the interference fit of the press fit is weakened.

In extreme cases, this can become a transitional fit from the excess. Under certain operating conditions of the vacuum pump and / or the drive system, for. B. in conjunction with a belt drive, the bearing is also applied in the operating state of axial forces.

Such under marginal conditions, such as heat input, acted upon by axial forces bearing can move axially under the influence of these axial forces, one speaks in this context of a "crawl" or "wander" of the camp.

To avoid this is in conventional vacuum pumps an axial position assurance of the bearing, for example by a federal government and / or a circlip, but also by caulking u. Ä. Mandatory.

However, all of these axial position fuses are in the case of the solution presented here according to the invention 36 not required because in the inventive solution, the drive shaft 2 and that with the drive shaft 2 connected bearings 36 solely from the electromagnetic forces between the stator 27 and rotor 35 , always position-safe exactly in its starting position is held.

According to the invention, furthermore, that between the pump housing 1 and one on the pump housing 1 by means of fastening elements 30 arranged pump cover 3 a profile seal 31 is arranged.

This causes a reliable seal of the working chamber.

According to the invention is also that the pump cover 3 and / or the engine cover 29 is provided with coolant channels for cooling and coolant distribution to other consumers.

Thus, the vacuum pump according to the invention can also be mounted under extreme operating conditions, such as at high temperatures in the region of the exhaust gas tract.

By means of the solution according to the invention, it has thus been possible to provide an electrically driven vacuum pump for vehicles, which is so small that it can be arranged in the space of a provided with a pulley, mechanically driven vacuum pump, while at the same time is very simple and robust , can also be easily manufactured and assembled with minimal use of materials production, a high reliability, with low friction losses and long life guaranteed and also characterized by high volumetric efficiency by a very high mechanical efficiency.

With the brushless DC motor (BLDC motor 14 ) can be realized an optimal needs-based control.

In the arrangement according to the invention, a drive characteristic map adapted to the pump mechanism with a gentle start-up and low power peaks in combination with the high mechanical efficiency caused by the arrangement according to the invention causes a very small Power consumption, whereby the control units less burdened, thus spared, and a long life of these components of the inventive solution can be effected.

The inventively used BLDC motor 14 is free of mechanical commutation devices. It runs very quietly, is durable and practically maintenance-free. In regulated operation, the set speed remains constant during load and / or supply voltage fluctuations.

In the 5 For example, the characteristic curves of the line receptacles and their mean values of the electric vacuum pump according to the invention are compared with those of a modern mechanical vacuum pump currently used in vehicles over a driving cycle of a vehicle, the "New European Driving Cycle" (NEDC).

The continuous characteristic curve A, which is shown as a solid line and oscillates strongly around the mean value, describes the power consumption of a mechanical vacuum pump over a drive cycle.

During braking or when a too low vacuum is detected in the brake booster, the vacuum pump has to do more work, compared to the evacuated state. This can be recognized by the strong "mean" value of the characteristic curve A with large power fluctuations and associated power peaks.

The mechanical vacuum pump is "dragged along" during the entire driving cycle, d. H. even then, even if no negative pressure is needed.

This results in the characteristic curve B, represented as "broken dashed line", of average power consumption of approximately 100 watts over one driving cycle.

These characteristics A and B of the course of the power consumption and the resulting average power consumption of a mechanical vacuum pump over a driving cycle, are in the 5 compared with the course of power consumption and the average power consumption of an electric vacuum pump according to the invention. The characteristic curve C of the power consumption of the electric vacuum pump according to the invention shows only narrow bars, since these are controlled as needed. The resulting characteristic curve D of the average power consumption over a drive cycle is shown as a "dash-dotted line" and lies as an average at about 18 watts and thus significantly below the characteristic curve B with an average power consumption of about 100 watts.

Out of these in the 5 shown power consumption then results in 6 illustrated CO ₂ savings when using an electric Orbiterakuumpumpe according to the invention over the use of mechanical, mainly used in the prior art conventional mechanical vacuum pumps, as well as compared to the new generation of Orbitervakuumpumpen with mechanical drive.

In this 6 From left to right, the average power consumption (left y-axis) of a conventional mechanical vacuum pump (bar B) used in the prior art, the average power consumption of a mechanically driven, orbiter-operated vacuum pump (bar E), the average power consumption an inventive electrically driven operating according to the orbiter vacuum pump (bar D) and the average power consumption of an inventive electrically driven vacuum pump with orbiter in operation with braking energy recovery by recuperation (bar F) shown.

Here are based on the Orbital vacuum pump principle, inventive electromotive solution with BLDC motor, in addition to the already described advantages of the solution according to the invention, considerable additional, not expected by the expert CO ₂ savings compared to conventionally driven vacuum pumps (without Orbiterprinzip) achieved. According to the line recording in the driving cycle, determined according to the "New European Driving Cycle", this results in the 6 represented CO ₂ potentials (bars G, H, I and K).

With the electric orbital vacuum pump according to the invention are 0.60 g CO ₂ / km without brake energy recovery (beam I) and when operating with brake energy recovery ie by recuperation even (bar K) 0.75 g CO ₂ / km compared to a conventional vacuum pump without Orbiterprinzip with mechanical drive (Bar G), saved.

The solution according to the invention, with all the advantages according to the invention, can be integrated very well into the installation spaces already provided for mechanical vacuum pumps in the engine compartment of the vehicle. As a result, a mechanical vacuum pump can be replaced quickly and without problems by the inventive solution of an electric motor-driven vacuum pump with orbiters according to the "plug and play" principle.

This was not possible with the hitherto provided in the prior art solutions of conventional electric motor driven vacuum pumps, which were characterized by an elongated structure, for which only a suitable space had to be found, and which also characterized by a much shorter life, not possible At present, when using a brush motor is expected to have a life of about 1000 h.

At this point, it is imperative to note that the BLDC motor is used 14 At the same time, the high life-cycle requirements applicable in the automotive industry (from 1,800 h to 4,000 h) can be guaranteed at the same time. At present, as mentioned above, a brushed motor always had a life of approximately 1000 hours. This could not meet the strict standards of the automotive industry.

LIST OF REFERENCE NUMBERS

1

pump housing

2

drive shaft

3

pump cover

4

working chamber

5

inner wall

6

eccentric

7

bearing bolt

8th

Orbiter

9

cylinder surface

10

guide slot

11

suction

12

outflow

13

blocking slide

14

BLDC motor

15

roller bearing ring

16

rolling elements

17

Exzentersitz

18

rotor seat

19

poetry

20

Lagerflansch

21

bearing seat

22

Rotor shaft receiving

23

permanent magnet

24

rotor pot

25

stator seat

26

Exzenterscheibenaufnahmeraum

27

stator

28

Verschaltungsring

29

engine cover

30

fastener

31

profile seal

32

sensor

33

Magnetic ring sensor

34

ECU / control unit

35

rotor

36

camp

P

input

t

uptime

A

Power consumption of a mechanical vacuum pump (prior art)

B

Average power consumption of a mechanical vacuum pump (prior art)

C

Power consumption of an electric vacuum pump according to the orbiter principle according to the invention

D

Average value of the power consumption of an electric vacuum pump according to the orbiter principle according to the invention

e

Average power consumption of a mechanical orbital vacuum pump (prior art)

F

Mean value of the power consumption of an electric vacuum pump according to the invention according to the orbiter principle with brake energy recovery (recuperation)

G

CO ₂ savings in g / km of a mechanical vacuum pump (prior art)

H

CO ₂ savings in g / km of a mechanical vacuum pump according to the orbiter principle (state of the art) CO ₂ savings in g / km of an inventive electric vacuum pump according to the orbiter principle

K

CO ₂ savings in g / km of an inventive electric vacuum pump according to the Orbiterprinzip with braking energy recovery (recuperation)

Claims (6)

Electromotor-driven vacuum pump with a pump housing ( 1 ), one in the pump housing ( 1 ) in bearings rotatably mounted drive shaft ( 2 ), and one in the pump housing ( 1 ), from the pump housing ( 1 ) alone, or from the pump housing ( 1 ) in conjunction with a pump cover ( 3 ) working chamber ( 4 ) with a cylindrical inner wall ( 5 ), one on the drive shaft ( 2 ) arranged eccentric disc ( 6 ) with an eccentrically arranged bearing pin ( 7 ), one rotatable on the bearing pin ( 7 ), in the cylindrical inner wall ( 5 ) of the working chamber ( 4 ) revolving piston drum, the orbiter ( 8th ), with a cylinder jacket ( 9 ), one in the orbiter ( 8th ) arranged guide slot ( 10 ), as well as one in the working chamber ( 4 ) arranged suction opening ( 11 ) and one in the working chamber ( 4 ) arranged outflow opening ( 12 ), with one between the suction port ( 11 ) and the discharge opening ( 12 ) arranged in the pump housing ( 1 ) pivotally mounted gate valve ( 13 ) in the guide slot ( 10 ) of the orbiter ( 8th ) is slidably mounted, slidably mounted, and one on the drive shaft ( 2 ), the vacuum pump driving electric motor, characterized in that - the drive shaft ( 2 ) in only one warehouse ( 36 ) by means of rolling elements ( 16 ) in a rolling bearing ring ( 15 ) is mounted so that the drive shaft ( 2 ) the rolling bearing ring ( 15 ) on the pump side with an eccentric seat ( 17 ) and on the drive side with a rotor seat ( 18 ) surmounted, and on both sides of the rolling elements ( 16 ) between the drive shaft ( 2 ) and the rolling bearing ring ( 15 ) Seals ( 19 ) are arranged, and - that the rolling bearing ring ( 15 ) in a drive side rigidly on the pump housing ( 1 ), in the pump housing ( 1 ) integrated, cylindrical bearing flange ( 20 ) in an internally cylindrical bearing seat ( 21 ) of the bearing flange is arranged such that the rotor seat ( 18 ) the pump housing ( 1 ), and - that on the rotor seat ( 18 ) with a rotor shaft receptacle ( 22 ), on the outer circumference with permanent magnets ( 23 ) equipped Rotortopf ( 24 ), the rotor ( 35 ) of a brushless DC motor, the BLDC motor ( 14 ), is arranged so that this freely circulating the cylindrical bearing flange ( 20 ) spaced so encloses that the permanent magnets ( 23 ) radially spaced in the region of the bearing seat ( 21 ) arranged with rolling elements ( 16 ) fitted rolling bearing ring ( 15 ) are arranged, and - that on the outside of the pump housing ( 1 ) the bearing flange ( 20 ) pump housing adjacent a housing shoulder is arranged so that this by the wall thickness of the pump housing ( 1 ) spaced inside the pump housing ( 1 ) simultaneously an eccentric disc receiving space ( 26 ), in which the on the eccentric seat ( 17 ) of the drive shaft ( 2 ) arranged eccentric disc ( 6 ) circulates freely, and - that on the pump housing ( 1 ) a housing cover enclosing the motor cover ( 29 ) is arranged, in which at a stator seat ( 25 ) the stator ( 27 ) of the BLDC motor ( 14 ) opposite the rotor pot ( 24 ), wherein the stator ( 27 ) as well as the other components of the BLDC motor ( 14 ) with the associated Verschaltungsring ( 28 ) in the engine cover ( 29 ) Are positioned exactly positioned so that after attaching the engine cover ( 29 ) on the pump housing ( 1 ), by means of fastening elements ( 30 ), all components of the BLDC motor ( 14 ) are positioned with respect to each other and with respect to the other components of the vacuum pump not only exactly in the position, but at the same time are securely and reliably fixed in their position. Electromotor-driven vacuum pump according to claim 1, characterized in that the rotor pot ( 24 ) is integrally formed of a soft magnetic material. Electromotor-driven vacuum pump according to claim 2, characterized in that the one-piece rotor pot ( 24 ) is formed by a homogeneous soft magnetic sintered part. Electromotor-driven vacuum pump according to one or more of claims 1 to 3, characterized in that the rolling bearing ring ( 15 ) of the warehouse ( 36 ) in the cylindrical bearing flange ( 20 ) is pressed, ie that frontally on the camp ( 36 ) No position securing elements are arranged against axial displacements. Electromotor-driven vacuum pump according to one or more of claims 1 to 4, characterized in that between the pump housing ( 1 ) and one on the pump housing ( 1 ) by means of fastening elements ( 30 ) arranged pump cover ( 3 ) a profile seal ( 31 ) is arranged. Electromotor-driven vacuum pump according to one or more of claims 1 to 5, characterized in that the pump cover ( 3 ) and / or the engine cover ( 29 ) is provided with coolant channels for cooling and coolant distribution to other consumers.

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