EP4259935A1 - Pumpenvorrichtung für ein hydraulisches system eines kraftfahrzeugs, hydraulisches system - Google Patents
Pumpenvorrichtung für ein hydraulisches system eines kraftfahrzeugs, hydraulisches systemInfo
- Publication number
- EP4259935A1 EP4259935A1 EP21836093.1A EP21836093A EP4259935A1 EP 4259935 A1 EP4259935 A1 EP 4259935A1 EP 21836093 A EP21836093 A EP 21836093A EP 4259935 A1 EP4259935 A1 EP 4259935A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spindle
- pump device
- housing
- stator housing
- delivery
- 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.)
- Granted
Links
Classifications
-
- 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
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
Definitions
- the invention relates to a pump device for a hydraulic system of a motor vehicle, with an electric drive motor, with a delivery spindle coupled to the drive motor, and with a cylindrical housing in which the delivery spindle is rotatably mounted, with the delivery spindle forming delivery chambers together with the housing move from a fluid inlet to a fluid outlet of the housing by a rotary movement of the feed screw.
- the invention relates to a hydraulic system for a motor vehicle, in particular a lubricant system, coolant system, fuel system, exhaust gas aftertreatment system or the like, with at least one pump device as described above.
- Pump devices of the type mentioned are known from the prior art.
- published application DE 10 2017 210 770 A1 discloses a generic pump device which is designed as a screw pump.
- the known pump device has two screw spindles, which are arranged parallel to one another, engage in one another and, together with the housing surrounding them, each form pumping chambers for pumping the fluid.
- Another generic pump device is known from published application JP 2002-257053 A.
- Further pump devices with screw spindles are known from the published patent applications US Pat. Nos. 6,499,966 B1 and US 2020/0056462 A1.
- the present invention is based on the object of creating an improved pump device which, with a high delivery volume, has a reduced number of parts and can be integrated into a hydraulic system in a space-saving manner.
- a pump device having the features of claim 1 .
- This is characterized in that an axis of rotation of the conveyor spindle is arranged eccentrically to a central longitudinal axis of the housing in the housing, that the housing as an outer spindle has a spindle structure on its inner side facing the conveyor spindle, with the conveyor spindle and the outer spindle intermeshing to form the conveyor chambers form, and that the outer spindle or the housing is rotatably mounted about the central longitudinal axis.
- the The pump device thus has two delivery spindles, of which the delivery spindle forms an inner spindle and the other delivery spindle forms an outer spindle, which interact to form the delivery chambers between them.
- both the housing and the delivery spindle are rotatably mounted and these two are in engagement with one another, it is sufficient for the operation of the pump device to drive either the delivery spindle or the housing.
- the rotational movement of one element is transmitted to the other element by the interlocking spindle structures. Due to the interlocking spindles of the pump device according to the invention, a high displacement volume or a high delivery rate can be achieved in a small space.
- the drive motor is connected either to the outer spindle or to the feed spindle.
- the drive motor of the drive motor is connected to the feed spindle or the outer spindle directly or through a transmission gear in order to transmit the torque from the drive motor to the pump device.
- the outer spindle is designed as an inner rotor of the drive motor.
- the outer spindle itself thus forms a drive shaft of the drive motor and is therefore integrally formed in the drive motor.
- the drive motor drives the outer spindle of the pump device directly and is arranged particularly close to the conveyor spindle and outer spindle, which saves further installation space.
- mechanical losses in particular between the drive motor and the outer spindle are minimized.
- a stator associated with the internal rotor is particularly preferably held in a stator housing, with the outer spindle and/or the conveyor spindle being rotatably mounted on the stator housing.
- the stator housing thus forms a pump housing of the pump device, in which the essential components of the pump device, namely the outer spindle, delivery spindle and drive motor, are at least essentially arranged and protected from external influences.
- the stator housing has a bearing plate on the end face for the rotatable mounting of the conveyor spindle.
- the respective end shield extends in particular over the respective end face of the stator housing, so that the end shield axially covers both the conveyor spindle and the outer spindle.
- the conveyor spindle is slide-mounted in the respective bearing plate.
- the slide bearing ensures a particularly compact design of the pump device, which can also be implemented cost-effectively by dispensing with separate rolling element bearings.
- the conveyor spindle is supported by the one rolling element bearing in the respective end shield in order to minimize friction losses.
- At least one of the end shields is preferably formed separately from the stator housing and attached to it, for example welded, screwed and/or glued.
- the bearing plate is particularly preferably connected to the stator housing in a form-fitting manner, in particular in the circumferential direction and/or radial extent, in order to ensure permanently secure positioning of the bearing plate on the stator housing and thus permanently secure positioning of the conveyor spindle in the outer spindle.
- at least one of the end shields is preferably formed in one piece with the stator housing. This ensures a permanently secure connection between the end shield and the stator housing.
- the end shield is designed separately from the stator housing, it preferably forms at least one anti-rotation lock or anti-twist lock with the stator housing, which acts in a form-fitting manner in the circumferential direction.
- the anti-rotation lock ensures that the end shield cannot rotate relative to the stator housing, which would change the position of the feed spindle in the outer spindle.
- the anti-rotation device is formed in particular by at least one axial projection of the bearing plate or the stator housing, which engages with at least one axial recess in the stator housing or the bearing plate. Unintentional twisting of the end shield is thus reliably prevented and clear positioning of the end shield during assembly is ensured using simple means.
- the outer casing wall of the outer spindle forms a sliding bearing for the rotatable mounting of the outer spindle with an inner casing wall of the stator housing.
- the outer spindle or the housing is thus slide-mounted directly in the stator housing, which creates a space-saving design of the pump device.
- the slide bearing or a rolling element bearing should be selected.
- the stator housing preferably extends axially beyond the stator in at least one direction.
- the stator housing is axially longer than the stator, which ensures that a sufficiently long delivery distance of the pump device through the outer spindle and delivery spindle within the stator housing can be guaranteed, regardless of the dimensioning of the drive motor.
- the outer spindle and inner spindle preferably also extend axially beyond the drive motor or the stator.
- the stator housing extends axially on both sides of the stator, so that connection pieces for further elements of a hydraulic system, such as hydraulic lines, in particular hydraulic hoses, are provided through the stator housing on both sides of the drive motor.
- the conveyor spindle and the outer spindle are each designed as a screw spindle, ie as an outer screw spindle and an inner screw spindle. This creates advantageous delivery chambers that ensure a high delivery volume during operation of the pump device.
- the respective shield has one or more flow openings for the fluid to be pumped.
- the fluid to be pumped enters the pump device axially and also exits the pump device again axially. This avoids flow losses, which are necessary, for example, due to deflections in the case of radial entry directions. This further increases the efficiency of the present pump device.
- the outer spindle and the conveyor spindle are designed in such a way that their axial extension is at least 1.2 times longer than a conveyor chamber formed between the outer spindle and the inner spindle. This ensures safe fluid delivery through the pump device during operation. By reversing the direction of rotation when driving the pump device, a reversal of the conveying direction is also achieved, so that a reversal of the conveying direction is made possible by a corresponding activation of the drive motor without any special additional means.
- At least one seal and/or at least one leakage opening is formed between the outer casing wall of the outer spindle and the stator housing.
- the seal ensures that the fluid to be pumped does not get to the drive motor and, for example, impair its function.
- at least one leakage opening is formed between the outer wall of the jacket and the stator housing, through which part of the fluid to be pumped also reaches the drive motor and, for example, a control unit of the drive motor in order to cool them during operation of the pump device.
- separate cooling devices for the pump device can be dispensed with.
- Figure 1 shows an advantageous pump device in a perspective
- FIG. 2 shows the pump device in a perspective longitudinal section
- FIGS 4A and 4B individual parts of the pump device in perspective views.
- FIG. 1 shows a perspective view of an advantageous pump device 1 for a hydraulic system 2 (not shown in detail here), which is designed, for example, as a coolant system, lubricant system, or resource system for a motor vehicle.
- the pump device 1 has a drive motor 3 which is designed to drive a hydraulic pump 4 by an electric motor.
- the drive motor 3 has a stator 5 which interacts with a rotatably mounted rotor 6 which is arranged coaxially thereto in the stator 5 and which drives the pump 4 .
- the stator 5 has an annular stator yoke 7 from which a plurality of stator teeth 8 extend radially inwards in the direction of the rotor 6 , with each of the stator teeth 8 being assigned a drive winding or part of a drive winding 9 of the drive motor 3 .
- FIG. 2 shows the pump device 1 from FIG. 1 in a perspective longitudinal section.
- the stator teeth 8 end on their side facing away from the stator yoke 7 on or in a stator housing 10, so that the stator teeth 8 are at least substantially lie outside of the stator housing 10.
- the stator housing 10 itself is cylindrical and extends axially beyond the stator 5 on both of its end faces, so that the overall axial length of the stator 5 or of the drive motor 3 is significantly smaller in relation to the axial length of the stator housing 10 .
- the pump 4 is formed in the stator housing 10 and the rotor 6 of the drive motor 3 is arranged.
- the rotor 6 is rotatably mounted in the cylinder housing 10, in particular with the interposition of a roller bearing, a plain bearing or a hydrodynamic bearing.
- the stator housing 10 For receiving the rotor 6 , the stator housing 10 has a receiving section 11 which has an inner diameter which corresponds at least essentially to the outer diameter of the rotor 6 and/or the rolling element bearing carrying the rotor 6 .
- the rest of the stator housing 10 has an inside diameter that is smaller than the inside diameter in the receiving section 11 .
- the stator housing 10 has a bearing section 12 on each of its end faces, which is designed to support a housing 14 , designed as an outer spindle 13 , of the pump 4 .
- the pump 4 has the aforementioned outer spindle 13 and a delivery spindle 15, the outer spindle 13 being designed in the manner of a hollow shaft with an inwardly projecting spindle structure which interacts with the spindle structure of the delivery spindle 15 to form delivery chambers 16 for the fluid to be delivered to train.
- Outer spindle 13 and conveyor spindle 15 are each designed as screw spindles, both of which are rotatably mounted in stator housing 10 .
- the outer spindle 13 is rotatably mounted directly in the stator housing 10, with the inner diameter of the stator housing 10 in the bearing sections 12 preferably corresponding at least substantially to the outer diameter of the outer casing wall of the outer spindle 13, so that there is an advantageous sliding bearing between the outer spindle 13 and the stator housing 10 in the bearing sections 12 is guaranteed.
- the stator 10 has a larger outer diameter between the bearing sections 12, so that the outer spindle 13 does not rest on the entire surface or only in certain areas of the stator housing 10 with its outer jacket wall.
- the outer spindle 13 is advantageously rotatably supported in the stator housing 10 by the plain bearing 17 .
- the outer spindle 13 is arranged coaxially to the stator housing 10 in the stator housing 10 so that the central longitudinal axis 18 of the outer spindle 13 and of the stator housing 10 are aligned or correspond to one another.
- the feed spindle 15 is arranged in the stator housing 10 in such a way that the central longitudinal axis
- the stator housing 10 has a bearing plate 20 on each of its front ends for mounting and positioning the conveyor spindle.
- the respective end shield has an outer circular ring 21, the outer diameter of which corresponds in particular to the outer diameter of the stator housing 10 and which is arranged coaxially with the stator housing 10. Furthermore, the ring 21 carries a bearing 22 for the conveyor spindle 15. The bearing 22 is connected in particular in one piece to the ring 21 by a plurality of struts 23, which in particular extend radially.
- the bearing 22 has, for example, a bearing pin 24 which rests in a bearing pin receptacle 25 which is central in cross-section in one of the end faces of the conveyor spindle 15 . If both bearing plates 20 are of the same design, the conveyor spindle 15 is held on the end face of a bearing pin 24 or pushed onto it and is thereby rotatably mounted on the bearing plate 20 .
- the bearing pin or the bearing 22 is arranged eccentrically to the ring 21 so that the central longitudinal axis 19, as already mentioned, is offset from the central longitudinal axis 18 of the housing 14 and the stator housing 10.
- FIGS. 3A and 3B each show an axial plan view of the pump device, the bearing plate 20 being removed in FIG. 3A and the bearing plate being mounted in FIG. 3B.
- FIG. 3A shows that the central longitudinal axes 19 and 18 are offset from one another and that the spindle structures of the conveyor spindle 15 and the outer spindle 13 engage in one another.
- the respective end shield 20 connects the ring 21 to the bearing 22 by means of a plurality of, here three, struts 23 .
- the struts 23 are arranged or formed so as to be distributed uniformly over the circumference of the bearing 22 . This creates flow openings 26 between the struts 23, through which a fluid to be pumped can enter or exit the pump 4, depending on the pumping direction of the pump 4.
- FIGS. 4A and 4B show individual parts of the pump 4, namely the outer spindle 13 in Figure 4A and the feed spindle 15 in Figure 4B.
- the conveyor spindle 15 in Figure 4B is designed according to an alternative embodiment, in which the conveyor spindle 15 itself has the bearing pin 24 at the end, so that the respective bearing 22 then has the bearing pin receptacle 25 in accordance with it, in which the respective bearing pin 24 rests in a rotatably mounted manner.
- the spindle structures of the outer spindle 13 and the feed spindle 15 are designed as screw spindles. Due to the eccentric arrangement of the central longitudinal axes 18, 19 of the two spindles, as shown in particular in FIG.
- the outer spindle 13 and the delivery spindle 15 form the advantageous delivery chambers 16 between them. It is preferably provided that the maximum outer diameter of the conveyor spindle 15 within the outer spindle 13 is smaller than the smallest inner diameter of the outer spindle 13, so that rotation of the conveyor spindle 15 within the outer spindle 13 is reliably ensured at all times. Due to the fact that the spindle structures are designed to form the pressure chambers 16 and due to the offset arrangement of the central longitudinal axes, the result is that the spindle structures are in engagement with one another in certain areas. This ensures that at least one elevation of the spindle structure of the conveyor spindle 15 always rests in a depression of the spindle structure of the outer spindle 13 . As a result, the spindles are always positively coupled or connected to one another, viewed in the direction of rotation, and the delivery chambers 16 are securely formed.
- the rotor 6 is non-rotatably connected to the outer spindle 13 so that when the drive motor 3 is activated, the rotor 6 takes the outer spindle 13 with it or applies a torque.
- the inner conveyor spindle 15 is also driven by the interlocking spindle structures, so that the conveyor chambers 16, which are formed between the conveyor spindles 15 and the outer spindle 13, are moved from one end face to the opposite end face of the stator housing 10, whereby fluid flows from one end face to the other Front side is promoted.
- stator housing 10 protrudes axially from the drive motor 3 in both directions, the stator housing 10 can, for example, simply be pushed into hydraulic lines or hydraulic hoses on both sides or at the front in order to achieve the hydraulic connection to the hydraulic system.
- the fluid is then conveyed from one direction to the other and one end shield 20 then serves as an inlet and the other end shield 20 as an outlet 4 on the pressure side.
- the length L of the pump 4 or the outer spindle 13 and the delivery spindle 15 is at least 1.2 times longer than the delivery chamber 16 formed between the spindles.
- the end shields 20 are not formed in one piece but separately on the stator housing 10, which simplifies the assembly of the pump device 1, the end shields 20 are held on the stator housing in a form-fitting manner, in particular with the aid of an anti-rotation lock 28, to prevent twisting and thus an adjustment of the eccentric position of the feed spindle 15 relative to the outer spindle 13 to prevent reliably.
- the respective anti-rotation device 28 is ensured in particular by a positive connection between the end shield 20 and the stator housing 10 acting in the circumferential direction.
- an axial projection of the end shield 20 can be arranged or is arranged in a complementary front-side depression of the stator housing 10 in order to prevent the end shield 20 from twisting relative to the stator housing 10 .
- the anti-rotation device 28 has a plurality of such projections and receiving recesses that interact with them.
- One of the end shields is particularly preferably designed in one piece with the stator housing 10 and the other end shield 20 as a separate component in order to ensure simple assembly of the pump device 1 with as few individual parts as possible.
- At least one sealing element 29 is preferably arranged between the outer spindle 13 and the stator housing 10, in particular adjacent to the bearing sections 12, so that the fluid to be pumped cannot get into the area of the stator housing 10 in which the drive motor 3 or the rotor 6 is located.
- the respective sealing element 29 is designed in particular as a ring seal or peripheral seal which rests on the outer wall of the outer spindle 13 on the one hand and on the inner wall or side of the outer casing of the stator housing 10 on the other hand.
- a leakage opening or a leakage gap 30 is formed between the outer spindle 13 and the stator housing 10 in the area of the bearing sections 12, for example by an axially extending groove, which is formed in the stator housing 10 or the outer spindle 13, and the one Leakage flow of the fluid into the area of the stator housing 10 between the bearing sections 12 is permitted and which is then used to cool the drive motor 3, in particular the rotor 6 or a control device or unit that may be arranged in the area of the drive motor 3 during operation of the pump device 1 .
- the exemplary embodiment with the seal 29 is drawn in the image plane to the left of the drive motor 3 and the exemplary embodiment with the leakage gap 30 to the right of the drive motor for a better understanding of both exemplary embodiments.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Rotary Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020215571.2A DE102020215571A1 (de) | 2020-12-09 | 2020-12-09 | Pumpenvorrichtung für ein hydraulisches System eines Kraftfahrzeugs, hydraulisches System |
| PCT/EP2021/084863 WO2022122858A1 (de) | 2020-12-09 | 2021-12-08 | Pumpenvorrichtung für ein hydraulisches system eines kraftfahrzeugs, hydraulisches system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4259935A1 true EP4259935A1 (de) | 2023-10-18 |
| EP4259935B1 EP4259935B1 (de) | 2026-04-01 |
Family
ID=79230787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21836093.1A Active EP4259935B1 (de) | 2020-12-09 | 2021-12-08 | Pumpenvorrichtung für ein hydraulisches system eines kraftfahrzeugs, hydraulisches system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4259935B1 (de) |
| DE (1) | DE102020215571A1 (de) |
| WO (1) | WO2022122858A1 (de) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2451474A1 (fr) * | 1979-03-14 | 1980-10-10 | Orszagos Koolaj Gazipari | Moteur hydraulique pour forages profonds |
| US4482305A (en) * | 1977-12-28 | 1984-11-13 | Orszagos Koolaj Es Gazipari Troszt | Axial flow apparatus with rotating helical chamber and spindle members |
| US20100092317A1 (en) * | 2006-12-20 | 2010-04-15 | Heishin Sobi Kabushiki Kaisha | Uniaxial Eccentric Screw Pump |
| JP6585382B2 (ja) * | 2015-05-27 | 2019-10-02 | 古河産機システムズ株式会社 | ねじポンプ |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT956647B (it) * | 1971-06-24 | 1973-10-10 | Kramer H | Dispositivo di trasporto partico larmente pompa |
| WO2000008338A1 (en) | 1998-08-06 | 2000-02-17 | Automotive Motion Technology Limited | A motor driven pump |
| JP2002257053A (ja) | 2001-02-26 | 2002-09-11 | Koyo Seiko Co Ltd | ポンプ装置及びこれを用いたパワーステアリング装置 |
| NL1029087C2 (nl) * | 2005-05-20 | 2006-11-21 | Maria Mantel | Transmissie VanBeek-4D. |
| KR100786591B1 (ko) * | 2007-02-05 | 2007-12-21 | 박승종 | 전동기 일체형 스크류 펌프 |
| US9784269B2 (en) * | 2014-01-06 | 2017-10-10 | Baker Hughes Incorporated | Hydraulic tools including inserts and related methods |
| CN104033381B (zh) | 2014-05-15 | 2016-04-13 | 西安交通大学 | 一种交流伺服直驱型二级五螺杆电液泵 |
| DE202015006862U1 (de) * | 2015-10-02 | 2015-10-23 | Beinlich Pumpen Gmbh | Pumpe für hydraulische Medien |
| DE102017100715A1 (de) * | 2017-01-16 | 2018-07-19 | Hugo Vogelsang Maschinenbau Gmbh | Regelung der Spaltgeometrie in einer Exzenterschneckenpumpe |
| DE102017210770B4 (de) | 2017-06-27 | 2019-10-17 | Continental Automotive Gmbh | Schraubenspindelpumpe, Kraftstoffförderaggregat und Kraftstofffördereinheit |
| US20200056462A1 (en) | 2018-08-16 | 2020-02-20 | Saudi Arabian Oil Company | Motorized pump |
| DE102018220811A1 (de) * | 2018-12-03 | 2020-06-04 | Audi Ag | Vorrichtung zum Fördern eines Kühlfluids |
-
2020
- 2020-12-09 DE DE102020215571.2A patent/DE102020215571A1/de not_active Withdrawn
-
2021
- 2021-12-08 WO PCT/EP2021/084863 patent/WO2022122858A1/de not_active Ceased
- 2021-12-08 EP EP21836093.1A patent/EP4259935B1/de active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4482305A (en) * | 1977-12-28 | 1984-11-13 | Orszagos Koolaj Es Gazipari Troszt | Axial flow apparatus with rotating helical chamber and spindle members |
| FR2451474A1 (fr) * | 1979-03-14 | 1980-10-10 | Orszagos Koolaj Gazipari | Moteur hydraulique pour forages profonds |
| US20100092317A1 (en) * | 2006-12-20 | 2010-04-15 | Heishin Sobi Kabushiki Kaisha | Uniaxial Eccentric Screw Pump |
| JP6585382B2 (ja) * | 2015-05-27 | 2019-10-02 | 古河産機システムズ株式会社 | ねじポンプ |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2022122858A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022122858A1 (de) | 2022-06-16 |
| EP4259935B1 (de) | 2026-04-01 |
| DE102020215571A1 (de) | 2022-06-09 |
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