DE102018108194A1 - Pump assembly and method of making a pump assembly - Google Patents

Abstract

The invention relates to a pump arrangement 1, which comprises at least one housing 2 and two gears 6, 7 as conveying means. The housing 2 comprises at least one base plate 3 and a lid member 4, which are connectable to each other to form a pressure chamber 5. The two gears 6, 7 each have on an outer peripheral surface a toothing 8 and engage via the teeth 8 for conveying a fluid into one another , The gears 6, 7 are arranged along an axial direction 9 between the base plate 3 and the cover element 4 in the pressure chamber 5. The first gear 6 and the second gear 7 are each designed as a ring gear, wherein the first gear 6 is arranged on a first bearing bush 10 and the second gear 7 on a second bearing bush 11. The first bearing bushing 10 and the second bushing 11 are each mounted only in one of the base plate 3 and cover element 4. The invention also relates to a method for producing a pump arrangement.

Description

The invention relates to a pump arrangement and to a method for producing a pump arrangement. The pump assembly is provided for delivery of a fluid. The pump assembly includes a housing and in the housing conveying means for conveying a fluid from a fluid inlet to a fluid outlet. Fluid inlet and fluid outlet are disposed on the housing. At least one of the conveying means is driven by a drive shaft which extends from outside the housing into the housing. Here are provided as funding two intermeshing gears. Each gear has a toothing on the peripheral surface, wherein the gears are coupled together via the toothing.

The gears have rotational axes, which are oriented in particular along an axial direction. The gears are arranged side by side in a radial direction and overlapping in the axial direction, wherein the axes of rotation are arranged parallel to each other.

In such a pump arrangement, the conveying means can be arranged on shafts and the shafts can be mounted on bearings on both sides of the conveying means in the housing. Furthermore, a drive shaft can be connected directly to the conveying means and the conveying means can be mounted on bearings via the drive shaft. Beared means here in particular that in a radial direction (possibly in addition in an axial direction) acting forces at least in a radial direction (possibly also in the axial direction) via the conveyor on the shaft or on the bearing of the shaft in the Housing can be transferred. A bearing of the shaft on both sides of the conveyor requires a precise adjustment of the position tolerances of the bearing points on the housing. In particular, so uneven loads on the bearings and bending loads of the waves can occur.

On this basis, it is an object of the present invention, at least partially solve the problems described with reference to the prior art. In particular, a pump arrangement is to be proposed, which is as simple and easy as possible, with an uneven loading of the bearings should be reduced or even avoided. Furthermore, a method for assembling a pump assembly is to be proposed, wherein the assembly should take place with the least possible complexity.

To solve this problem, a pump assembly according to the features of patent claim 1 and a method according to the features of claim 10 is proposed. Advantageous developments are the subject of the dependent claims. The features listed individually in the claims can be combined in a technologically meaningful manner and can be supplemented by explanatory facts from the description and details of the figures, with further embodiments of the invention are shown.

A pump arrangement contributes to this, wherein the pump arrangement comprises at least one housing and two toothed wheels as conveying means. The housing comprises at least one base plate and a cover element, which are connectable to one another to form a pressure chamber. The two gears each have a toothing on an outer peripheral surface and engage with each other via the teeth for conveying a fluid. The gears are arranged along an axial direction between the base plate and the lid member in the pressure space. The first gear and the second gear are each designed as a ring gear, wherein the first gear is arranged on a first bearing bush and the second gear on a second bearing bush. The first bearing bush and the second bearing bush are each mounted only in the base plate or the cover element. This means, on the one hand, that the first bearing bush is mounted either (one-sidedly) only in the base plate or, alternatively, in the cover element. This further means that the second bearing bush is mounted either (one-sidedly) only in the base plate or alternatively in the cover element.

Here are provided as funding two intermeshing gears. Each gear has a toothing on the peripheral surface, wherein the gears are coupled together via the toothing. The gears each have an axis of rotation, which are oriented in particular along an axial direction. The gears are arranged in a radial direction adjacent to each other and / or in the axial direction overlapping each other, wherein the axes of rotation are arranged parallel to each other.

The housing is formed at least by a base plate and a lid member. These are arranged one behind the other along the axial direction (possibly objected to one another), the gears being positioned between them. Base plate and cover element surround the gears in a radial direction outside and thus form the pressure chamber. The pressure chamber is connected to a fluid inlet and a fluid outlet, so that a fluid can be delivered to the fluid outlet via the fluid inlet and the pressure chamber.

In particular, the bearing bushes are designed as so-called plain bearings or friction bearings. in the Slide bearing / friction bearing, the two relatively moving parts (here gear and bearing bush or bearing bush and housing, ie base plate and cover member) direct contact. They slide against each other against the resistance caused by sliding friction. This can be kept low by choosing a low-friction material pairing, by lubrication or by creating a lubricating film (full lubrication), which separates the two contact surfaces. But it can also be provided rolling bearings, in which case a rolling bearing between the housing and bearing bush or between bearing bush and gear is arranged.

In particular, the fluid delivered by the pump serves as a lubricant for storage. In this case, special fluid guides may be provided in the base plate and / or the lid member, through which a part of the pumped by the pump fluid is passed to the bearing point.

Here it is now proposed that each gear only on one side of the gear (or one side) in the housing (ie either in the base plate or in the cover member) is mounted on the bearing bush. The intended for the storage of each gear bearing bush extending from the gear only to the base plate or towards the lid member. Thus, the bearing bush is mounted or attached only on one side of the gear in the housing, so has only one (single) bearing point. In the radial direction acting forces are transmitted from the gear to the bearing bush (via the bearing between the gear and bearing bush) and from the bearing bush on the present on only one side of the gear bearing (between bearing bush and housing) on the housing.

In particular, both components of the group first bearing bush and second bearing bush are mounted or fastened only in the base plate or only in the cover element. In particular, both bearing bushes extend starting from the respective gear toward the same part of the housing, ie also in the same axial direction.

This arrangement is particularly advantageous because so only on one of the parts of the housing, ie on the base plate or on the cover element, a corresponding tolerance of the situation must be made.

The at least one bearing bush can be connected to the base plate or the cover element via an interference fit. This condition can also apply to both / all bushings. Press fit here means that before the bearing bush and the housing, an outer diameter of the bearing bush is greater than an inner diameter of the receiving bore (in the housing) for the bearing bush.

The at least one bearing bush can be materially connected to the baseplate or the cover element and executed in one piece (eg designed as a one-piece or multi-part green compact and then sintered together). This condition can also apply to both / all bushings.

Cohesive compounds are compounds in which the connection partners are held together by atomic or molecular forces. They are at the same time non-detachable connections, which can only be separated by destruction of the connecting means.

The at least one bearing bush can also be connected to the base plate or the cover element via a screw connection. For a screw can be arranged so that it extends through the base plate or the cover member into the bearing bush inside and there forms a connection with a thread of the bearing bush.

In particular, it is proposed that a sliding bearing between the bearing bush and the gear designed as a ring gear is provided. In particular, so that the bearing bush is fixedly arranged in the housing (ie in the base plate or in the cover member), so that a bending load of the bearing bush can be reduced or a defined force transfer from the bearing bush to the housing via the bearing between bearing bush and housing can be done.

In particular, an intermediate element is arranged along the axial direction between the base plate and the cover element, wherein the intermediate element encloses the gear wheels in a radial direction on the outside and forms the pressure space together with the base plate and the cover element. The intermediate element is in particular a disc element that is tolerated with respect to a width of the gears and thus defines a length of the pressure chamber along the axial direction.

In particular, at least the base plate and the cover element (possibly additionally the intermediate element) are aligned with one another via connecting elements and connected to one another. In particular, at least one of the connecting elements extends along the axial direction through the intermediate element and connects the base plate and the cover element.

In particular, at least one of the gears is drivable as a drive gear via a drive shaft, wherein the drive shaft via a Opening in the cover element (directly) with the drive gear is connectable.

It is possible to drive each of the gears via a respective drive shaft.

In particular, no force acting in the radial direction is transmitted from the gears via the drive shaft to the housing via the drive shaft. In particular, therefore, the drive shaft transmits only acting in the circumferential direction drive torque to the drive gear.

According to a preferred embodiment, at least the base plate and the cover element are at least partially designed as sintered parts.

Preferably, at least one of the bearing bushes is designed as a sintered part.

Particularly preferably, at least one of the following components, possibly several or all of the following components, designed as a sintered part: the base plate, the cover element, the intermediate element, the bearing bushes, the gears, the connecting elements.

A sintered part is a component pressed from a powdery material (green compact), which was subsequently fed to a sintering process. In particular, at least one, preferably all of: the base plate, the cover element, the intermediate element, the bearing bushes, the gears, the connecting elements, is made of a metallic powder by pressing and sintering. In particular, bearing bushes and the bearing bushes receiving part of the housing as separate green compacts (preferably made of different materials) produced as green bodies joined together (preferably to form a press fit) and then sintered together.

1. a) Bereitstellen von der Grundplatte, dem Deckelelement, eines ersten Zahnrades sowie eines zweiten Zahnrades; ggf. zusätzlich Bereitstellen eines Zwischenelements und/oder mindestens eines Verbindungselements;
2. b) Anordnen des ersten Zahnrades auf einer ersten Lagerbuchse, die nur mit einem von Grundplatte und Deckelelement verbunden und darin gelagert ist sowie Anordnen des zweiten Zahnrades auf einer zweiten Lagerbuchse, die nur mit einem von Grundplatte und Deckelelement verbunden und darin gelagert ist, so dass die Zahnräder über die Verzahnungen miteinander zur Förderung eines Fluids ineinandergreifen;
3. c) Verbinden von Grundplatte und Deckelelement, insbesondere unter zusätzlicher Verwendung des Zwischenelements, zu einem Gehäuse unter Ausbildung eines Druckraums, wobei die Zahnräder entlang einer axialen Richtung zwischen der Grundplatte und dem Deckelelement in dem Druckraum angeordnet sind.

Furthermore, a method for producing a pump arrangement, in particular the pump arrangement proposed here, is proposed, wherein the pump arrangement comprises at least one housing with at least one base plate and one cover element as well as two toothed wheels. The gears each have a toothing on an outer peripheral surface and are each designed as ring gears. The method comprises at least the following steps:

1. a) providing the base plate, the cover element, a first gear and a second gear; optionally additionally providing an intermediate element and / or at least one connecting element;
2. b) arranging the first gear on a first bushing, which is connected to only one of the base plate and cover member and stored therein and arranging the second gear on a second bushing, which is connected to only one of the base plate and cover member and stored therein, so that the gears mesh with each other via the gears to convey a fluid;
3. c) connecting the base plate and cover element, in particular with the additional use of the intermediate element, to a housing to form a pressure chamber, wherein the gears are arranged along an axial direction between the base plate and the lid member in the pressure chamber.

Preferably, the bearing bushes are connected to the base plate or with the cover element via a press fit or cohesively. In particular, bearing bushes and base plate are already connected before sintering (or together, so performed in one piece).

The remarks on the pump arrangement apply equally to the method and vice versa.

By way of precaution, it should be noted that the numerical terms used here ("first", "second",...) Primarily serve (only) to distinguish a plurality of similar objects or quantities, that is to say, in particular, do not require any dependence and / or order of these objects or variables on one another pretend. If a dependency and / or order are required, this is explicitly stated here or it obviously results for the person skilled in the art when studying the concretely described embodiment.

• 1: eine erst Pumpenanordnung in einer perspektivischen Ansicht und in einer Explosionsdarstellung;
• 2: die Pumpenanordnung nach 1 in einer Seitenansicht im Schnitt;
• 3: eine zweite Pumpenanordnung in einer perspektivischen Ansicht und in einer Explosionsdarstellung; und
• 4: die Pumpenanordnung nach 3 in einer Seitenansicht im Schnitt.

The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the invention should not be limited by the embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and / or figures. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. The same reference numerals designate the same objects, so that explanations of other figures can be used if necessary. Show it:

• 1 a first pump arrangement in a perspective view and in an exploded view;
• 2 : the pump arrangement after 1 in a side view in section;
• 3 a second pump arrangement in a perspective view and in an exploded view; and
• 4 : the pump arrangement after 3 in a side view in section.

1 shows a first, known pump arrangement 1 in a perspective view and in an exploded view. 2 shows the pump assembly 1 to 1 in a side view in section. The 1 and 2 will be described together below.

The pump arrangement 1 includes a housing 2 and in the housing 2 Delivery means for conveying a fluid from a fluid inlet 20 to a fluid outlet 21 , fluid inlet 20 and fluid output 21 are on or in the housing 2 arranged. The fluid input shown here 20 and fluid output 21 can also be flowed through in the opposite direction, in which case the fluid inlet 20 the fluid outlet and the fluid outlet 21 forms the fluid inlet. The housing 2 includes a base plate 3 and a lid member 4 as well as an intermediate element 12 , which communicate with each other via fasteners 24 can be connected to form a pressure chamber 5 , The conveying means are along an axial direction 9 between the base plate 3 and the lid member 4 in the pressure room 5 arranged. The intermediate element 12 encloses in a radial direction 13 outside the gears 6 . 7 , The intermediate element 12 is a disk element that is designed with a view to a width of the gears 6 . 7 is tolerated and thus a length 17 of the pressure chamber 5 along the axial direction 9 Are defined. One of the funding is via a drive shaft 15 driven, extending from outside the case 2 in the case 2 extends into it. Here are as funding two interlocking gears 6 . 7 intended. Every gear 6 . 7 has a toothing 8th on the outer peripheral surface, wherein the gears 6 . 7 about the gearing 8th coupled to each other to promote a fluid.

The gears 6 . 7 have rotary axes 22 on that along an axial direction 9 are oriented. The gears 6 . 7 are in a radial direction 13 next to each other and in the axial direction 9 arranged overlapping, with the axes of rotation 22 are arranged parallel to each other.

The funding is on waves 15 . 23 arranged and the waves 15 . 23 on both sides of the conveyor in the housing 2 So here in the base plate 3 and in the cover element 4 , at storage locations 19 stored. Furthermore, a drive shaft 15 directly connected to the conveyor and the conveyor via the drive shaft 15 at storage locations 19 stored. Bearing here means that in a radial direction 13 (optionally in addition in an axial direction 9 ) acting forces at least in a radial direction 13 (possibly also in the axial direction 9 ) on the conveyor on the shaft 15 . 23 or to the depository 19 the wave 15 . 23 in the case 2 be transmitted. A storage of the shaft 15 . 23 but on both sides of the conveyor requires a precise vote of the position tolerances of the bearings 19 on the housing 2 , Here can uneven loads on the bearings 19 and bending loads of the waves 15 . 23 occur.

3 shows a second pump assembly 1 in a perspective view and in an exploded view. 4 shows the pump assembly 1 to 3 in a side view in section. The 3 and 4 will be described together below.

The pump arrangement 1 includes a housing 2 and in the housing 2 Delivery means for conveying a fluid from a fluid inlet 20 to a fluid outlet 21 , fluid inlet 20 and fluid output 21 are on or in the housing 2 arranged. The fluid input shown here 20 and fluid output 21 can also be flowed through in the opposite direction, in which case the fluid inlet 20 the fluid outlet and the fluid outlet 21 forms the fluid inlet. The pump arrangement 1 includes two gears 6 . 7 as a subsidy. The housing 2 includes a base plate 3 , an intermediate element 12 and a lid member 4 , which communicate with each other via fasteners 24 can be connected to form a pressure chamber 5 , The two gears 6 . 7 each have a toothing on an outer peripheral surface 8th up and grab the teeth 8th for conveying a fluid into each other. The gears 6 . 7 are along an axial direction 9 between the base plate 3 and the lid member 4 in the pressure room 5 arranged. The first gear 6 and the second gear 7 are each designed as a ring gear, wherein the first gear 6 on a first bearing bush 10 and the second gear 7 on a second bushing 11 is arranged. The first bearing bush 10 and the second bearing bush 11 are each only in the base plate 3 , The gears 6 . 7 have rotary axes 22 on that along an axial direction 9 are oriented. The gears 6 . 7 are in a radial direction 13 next to each other and in the axial direction 9 arranged overlapping, with the axes of rotation 22 are arranged parallel to each other.

baseplate 3 , Intermediate element 12 and cover element 4 are along the axial direction 9 arranged one behind the other, with the gears between them 6 . 7 are positioned. The intermediate element 12 encloses the gears 6 . 7 in a radial direction 13 outside, thus forming with the other parts of the housing 2 the pressure room 5 , The intermediate element 12 is a disk element that is designed with a view to a width of the gears 6 . 7 is tolerated and thus a length 17 of the pressure chamber 5 along the axial direction 9 Are defined. The pressure room 5 is with a fluid inlet 20 and a fluid outlet 21 connected, leaving a fluid over the fluid inlet 20 and the pressure room 5 to the fluid outlet 21 can be promoted.

The bearing bushes 10 . 11 are as so-called plain bearings 18 executed. In the plain bearing 18 have the two relatively moving parts (here gear 6 . 7 and bearing bush 10 . 11 ) direct contact. They slide against each other against the resistance caused by sliding friction and form the bearing 19 for the gear 6 . 7 ,

Every gear 6 . 7 is thus only on one side of the gear 6 . 7 in the case 2 , here in the base plate 3 over bearings 19 stored. The for the storage of each gear 6 . 7 provided bearing bush 10 . 11 extends from the gear 6 . 7 only to the base plate 3 , This is the bearing bush 10 . 11 only on one side of the gear 6 . 7 in the case 2 stored or attached, so has only one bearing point 19 on. In the radial direction 13 acting forces are so from the gear 6 . 7 on the bearing bush 10 . 11 and from the bearing bush 10 . 11 over, only on one side of the gear 6 . 7 present depository 19 on the case 2 transfer.

A plain bearing 18 is between each bushing 10 . 11 and each designed as a ring gear 6 . 7 intended. The bearing bushes 10 . 11 are firmly in the housing 2 (ie in the base plate 3 ), so that a bending load of the bearing bush 10 . 11 can be reduced or a defined force transfer from the bushing 10 . 11 on the case 2 can be done.

The base plate 3 and the lid member 4 as well as the intermediate element 12 are about fasteners 24 aligned and interconnected. The connecting elements 24 extend along the axial direction 9 through the intermediate element 12 and connect the base plate 3 and the lid member 4 ,

One of the gears 6 . 7 is as a drive gear 14 via a drive shaft 15 (please refer 1 and 2 ) drivable, wherein the drive shaft 15 over an opening 16 in the lid member 4 with the drive gear 14 is connectable. Recognizable is the drive gear 14 an internal toothing 26 arranged with the drive shaft 15 for driving the drive gear 14 is provided.

So is about the drive shaft 15 none in the radial direction 13 acting force from the gears 6 . 7 over the drive shaft 15 on the case 2 transfer. The drive shaft 15 transmits only one in the circumferential direction 25 acting driving torque on the drive gear 14 ,

3 also illustrates the method of manufacturing a pump assembly 1 , In step a) of the method become base plate 3 , Cover element 4 , Intermediate elements 12 , Fasteners 24 , first gear 6 as well as second gear 7 provided. In step b) becomes the first gear 6 on a first bearing bush 10 that only work with the base plate 3 connected and stored therein and the second gear 7 on a second bushing 11 , which also only with the base plate 3 connected and stored therein, arranged so that the gears 6 . 7 about the gears 8th mesh with each other to promote a fluid. In step c) become base plate 3 , Intermediate plate 12 and cover element 4 to a housing 2 under formation of a pressure chamber 5 connected, with the gears 6 . 7 along an axial direction 9 between the base plate 3 and the lid member 4 in the pressure room 5 are arranged.

LIST OF REFERENCE NUMBERS

1

pump assembly

2

casing

3

baseplate

4

cover element

5

pressure chamber

6

first gear

7

second gear

8th

gearing

9

axial direction

10

first bearing bush

11

second bearing bush

12

intermediate element

13

radial direction

14

drive gear

15

drive shaft

16

opening

17

length

18

bearings

19

depository

20

fluid inlet

21

fluid outlet

22

axis of rotation

23

wave

24

connecting member

25

circumferentially

26

internal gearing

Claims (10)

Pump arrangement (1), at least comprising - A housing (2) with at least one base plate (3) and a cover element (4) which are connectable to form a pressure chamber (5); and - Two gears (6, 7), wherein the gears (6, 7) each have on an outer peripheral surface a toothing (8) and via the toothing (8) for conveying a fluid intermesh; wherein the gears (6, 7) are arranged in an axial direction (9) between the base plate (3) and the lid member (4) in the pressure space (5); wherein the first gear (6) and the second gear (7) are each designed as a ring gear, wherein the first gear (6) arranged on a first bearing bush (10) and the second gear (7) on a second bearing bush (11) is, wherein the first bearing bush (10) and the second bearing bush (11) are each mounted only in the base plate (3) or the cover element (4). Pump arrangement (1) after Claim 1 , wherein both of first bearing bush (10) and second bearing bush (11) are mounted only in the base plate (3) or only in the cover element (4). Pump arrangement (1) according to one of the preceding claims, wherein at least one of the bearing bushes (10, 11) with the base plate (3) or the cover element (4) is connected via a press fit. Pump arrangement (1) according to one of the preceding Claims 1 to 3 , wherein at least one of the bearing bushes (10, 11) with the base plate (3) or the cover element (4) is integrally connected and made in one piece. Pump arrangement (1) according to one of the preceding claims, wherein an intermediate element (12) is arranged between the base plate (3) and the cover element (4) along the axial direction (9), the intermediate element (12) being arranged in a radial direction (13 ) outside the gears (6, 7) encloses and together with the base plate (3) and the cover element (4) forms the pressure chamber (5). Pump arrangement (1) according to one of the preceding claims, wherein at least the base plate (3) and the cover element (4) via connecting elements (24) aligned with each other and connected to each other. Pump arrangement (1) according to one of the preceding claims, wherein at least one of the gear wheels (6, 7) as drive gear (14) via a drive shaft (15) is drivable, wherein the drive shaft (15) via an opening (16) in the cover element ( 4) with the drive gear (14) is connectable. Pump arrangement (1) according to one of the preceding claims, wherein at least the base plate (3) and the cover element (4) are at least partially designed as sintered parts. Pump arrangement (1) according to one of the preceding claims, wherein at least the bearing bushes (10, 11) are designed as sintered parts. Method for producing a pump arrangement (1), wherein the pump arrangement (1) comprises at least one housing (2) with at least one base plate (3) and a lid element (4) and two toothed wheels (6, 7); wherein the gears (6, 7) each have on an outer circumferential surface a toothing (8) and are each designed as ring gears; the method comprising at least the following steps: a) providing of the base plate (3), the cover element (4), a first gear (6) and a second gear (7); b) arranging the first toothed wheel (6) on a first bearing bush (10) which is connected and supported only by one of the base plate (3) and cover element (4) and arranging the second toothed wheel (7) on a second bearing bush (11 ) which is connected to and supported only by one of the base plate (3) and lid member (4) so that the gears (6, 7) mesh with each other via the gears to convey a fluid; c) connecting the base plate (3) and cover element (4) to a housing (2) to form a pressure chamber (5), wherein the gear wheels (6, 7) along an axial direction (9) between the base plate (3) and Cover element (4) in the pressure chamber (5) are arranged.

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