Gearwheel rotor and pump device having a gearwheel rotor

Abstract

The invention relates to a gear wheel rotor device having at least two gear wheel rotor stages, wherein each gear wheel rotor stage comprises an inner rotor which rotates around an inner axis during operation, has radially outwardly projecting teeth, and an outer rotor which rotates around an outer axis which is radially offset relative to the inner axis during operation, has radially inwardly opening tooth gaps in which the teeth of the inner rotor engage during operation, wherein the tooth gaps are sealed relative to one another and / or relative to the surrounding area. Simplified and cost-effective production of the rotor device and compact design and reliable operation are achieved in that the rotor body comprises the radially opening tooth gaps of the first gear wheel rotor stage and the radially outwardly projecting teeth of the second gear wheel rotor stage, wherein the tooth gaps are sealed relative to one another and / or relative to the surrounding area. Furthermore, the invention relates to a pump device having such a gear wheel rotor device and to a motor vehicle having such a pump device.

Description

Technical Field

[0001] This invention relates to a gear rotor device having at least two gear rotor stages, wherein each gear rotor stage includes an inner rotor and an outer rotor. Furthermore, this invention relates to pump equipment having such a gear rotor device and motor vehicles having such pump equipment. Background Technology

[0002] The rotor consists of an inner rotor and an outer rotor, which rotate radially offset from each other about an axis during operation. The inner rotor includes outwardly projecting teeth that engage with the tooth gaps of the outer rotor during operation. The outer rotor opens radially inward to transport fluids, particularly liquids. Therefore, this type of rotor is commonly used in pumping equipment to pump liquids.

[0003] It is conceivable to form a gear rotor device in multiple stages. Then, the gear rotor device comprises at least two rotors, each forming a gear rotor stage. Therefore, fluid can be transported in a stepped manner (i.e., with different volumetric flow rates) or different fluids can be transported. Summary of the Invention

[0004] The object of this invention is to describe improved or at least other embodiments of gear rotor devices of the above-described type, pump devices having such gear rotor devices, and motor vehicles having such pump devices, which in particular remedy the shortcomings of the prior art. Specifically, the object of this invention is to describe embodiments of gear rotor devices, pump devices, and motor vehicles that have cost-effective and / or space-saving designs and / or reliable operating characteristics.

[0005] According to the present invention, this objective is achieved through the subject matter of the independent claims. The presentation of embodiments is the subject matter of the dependent claims.

[0006] The general concept upon which this invention is based is that in a gear rotor assembly having at least two gear rotor stages, the rotor of one gear rotor stage simultaneously serves as the rotor of the other gear rotor stage, preferably a rotor radially adjacent to the gear rotor stage, and the gear rotor stages are sealed relative to each other and / or relative to their surroundings. Therefore, it is unnecessary to separately manufacture and / or install these rotors in the gear rotor assembly. As a result, the production and assembly of the gear rotor assembly are simplified and cost-effective. Furthermore, in this manner, the gear rotor assembly can be designed to be more space-efficient. A similar approach applies to pump equipment with gear rotor assemblies and motor vehicles with such pump equipment. The sealing of the gear rotor stages relative to each other and / or relative to their surroundings prevents or at least reduces internal leakage in the gear rotor assembly, thereby making the operation of the gear rotor assembly more reliable. In addition, this method also prevents undesirable filling of one of the gear rotor stages by gas (e.g., air) drawn in due to pressure differences. This also improves the reliability of the gear rotor assembly during operation.

[0007] According to the concept of the invention, the gear rotor device comprises two gear rotor stages. Each gear rotor stage includes an inner rotor and an outer rotor, each rotor rotating about an associated axis during operation, wherein these axes are radially offset relative to each other. The inner rotor includes radially outwardly projecting teeth that engage in the radially inwardly opening tooth backing of the associated outer rotor during operation. This means that each gear rotor stage includes an inner rotor and an outer rotor, wherein the inner rotor rotates about an inner axis with radially outwardly projecting teeth during operation, and the outer rotor rotates about an outer axis with radially inwardly opening tooth backing during operation, the outer axis being radially offset relative to the inner axis, and the teeth of the inner rotor engaging in the tooth backing of the outer rotor during operation. The rotor body includes the tooth backing of one gear rotor stage (hereinafter also referred to as a gear rotor stage) and the teeth of the other gear rotor stage (hereinafter also referred to as a second gear rotor stage). During operation, the rotor body rotates about the associated axis (hereinafter also referred to as the rotor axis). Therefore, the gear rotor assembly includes a rotor body that rotates about a rotor axis during operation. The rotor body includes radially inwardly opening backlash of a first gear rotor stage and radially outwardly projecting teeth of a second gear rotor stage. The backlash of the gear rotor stages and thus the gear rotor stages are fluid-sealed to each other.

[0008] The various “radial” directions referred to here are the relevant axes. Therefore, the “axial” directions extend parallel to or coaxially with the corresponding axes. These axes extend in parallel.

[0009] Advantageously, the rotor axis of the rotor body corresponds to the outer axis of the first gear rotor stage and the inner axis of the second gear rotor stage. Therefore, the outer axis of the first gear rotor stage and the inner axis of the second gear rotor stage coincide, thus corresponding to each other and formed by the rotor axis. Consequently, the rotor axis and the gear rotor stage are matched, allowing the two gear rotor stages to operate in parallel.

[0010] The outer rotor of the second gear rotor stage preferably surrounds the rotor body radially outward. Therefore, the first gear rotor stage is a radial internal gear rotor stage, and the second gear rotor stage is an external gear rotor stage.

[0011] It can be imagined that the rotor body only includes a portion of the backlash of the first gear rotor stage and / or a portion of the teeth of the second gear rotor stage.

[0012] In a preferred embodiment, the rotor body includes all the backlash of the first gear rotor stage and / or all the teeth of the second gear rotor stage. This means that in the preferred embodiment, the rotor body forms the inner rotor of the first gear rotor stage and the outer rotor of the second gear rotor stage. Therefore, a simple, cost-effective, and space-saving design for the gear rotor device is achieved.

[0013] Advantageously, the gear rotor assembly includes a housing in which a gear rotor stage is housed, specifically an inner rotor, a rotor body, and an outer rotor.

[0014] The housing preferably includes a housing tank and a housing cover, the housing tank having a radially extending tank bottom, and the housing tank being closed by the housing cover, which is axially opposite to the tank bottom. The housing tank and housing cover define a containment volume in which the gear rotor stage is housed.

[0015] It is conceivable that, in the embodiments, the teeth and backlash of the rotor body are arranged at the same axial height. Therefore, a rotor body and gear rotor assembly with a smaller axial range can be specifically formed, thereby forming the rotor body and gear rotor assembly in a more space-saving manner.

[0016] It is advantageous when the inner rotor and rotor body of the first gear rotor stage terminate axially with each other, specifically, when they terminate axially in the frontal axial direction in a radially extending plane. Preferably, the inner rotor and rotor body of the first gear rotor stage and the outer rotor of the second gear rotor stage are each located on the front side of their respective radially extending plane. This makes the design of the gear rotor assembly particularly compact.

[0017] It can be imagined that the backlash of the rotor body protrudes axially on the teeth, and vice versa. Therefore, the first gear rotor stage can transmit higher torque compared to the second gear rotor stage, and vice versa.

[0018] Advantageously, the rotor body is formed in an axially stepped manner, i.e., it includes at least two steps radially offset from each other, which merge axially with each other. In particular, the rotor body includes two steps, namely a radially inner step and a radially outer step. Preferably, the radially inner step of the rotor body axially protrudes beyond the radially outer step of the rotor body and the outer rotor of the second gear rotor stage. Therefore, transmitting a higher torque through the first gear rotor stage than through the second gear rotor stage can be achieved in a simple and efficient manner.

[0019] Basically, the rotor body can be formed in multiple components. This means that the rotor body can include at least two separately manufactured components that are subsequently connected to each other. One component can include the tooth gap, while the other component can include the teeth of the rotor body.

[0020] In a preferred embodiment, the rotor body is formed integrally and monolithically. This means that the rotor body preferably does not contain any two or more separately manufactured components that are subsequently connected to each other. This makes the manufacture of the rotor body simple and cost-effective.

[0021] The rotor body can be manufactured in any way.

[0022] It is conceivable that the rotor body can be manufactured using primary molding methods, such as injection molding, particularly plastic injection molding. Therefore, the rotor body can be a particularly injection-molded part.

[0023] The rotor body can also be manufactured by sintering. Therefore, the rotor body can be a sintered component.

[0024] It should be understood that the gear rotor assembly may also include three or more gear rotor stages.

[0025] A gear rotor stage can include two or more such rotor bodies that are separated from and / or spaced apart from each other, wherein each rotor body is assigned to two gear rotor stages that are preferably radially adjacent to each other.

[0026] Sealing between the teeth and / or with respect to the surrounding area can be achieved in any way.

[0027] Preferably, the sealing of the tooth gaps relative to each other and / or relative to the surrounding area is achieved by the rotor body.

[0028] Therefore, the rotor body shall include an axially open and circumferentially shaped groove on at least one axially front side.

[0029] In an advantageous embodiment, the rotor body includes an axially opening, circumferentially shaped groove on at least one axially frontal side, which is filled with a liquid, particularly oil, for sealing. This simplifies the sealing of the tooth gaps. The liquid, particularly oil, is thus used as a sealing fluid. This liquid prevents the intake of gas, particularly air, into the corresponding tooth gaps.

[0030] In an advantageous embodiment, the rotor body includes an axially opening, circumferentially oriented groove and a housing on at least one axially frontal side, the housing serving a corresponding groove and an axially projecting, circumferentially oriented rib that engages in the associated groove. Thus, the groove and associated rib interact in a labyrinthine seal manner to seal the tooth backlash. This allows for simple and reliable sealing of the tooth backlash against each other. Furthermore, this makes sealing the tooth backlash relative to the surrounding area, and sealing the two gear rotor stages relative to each other, simple and reliable.

[0031] Basically, the rotor body can only have such a groove on one of the front sides, so the housing contains only one such rib.

[0032] In a preferred embodiment, the rotor body includes such grooves on both axial front sides, and the housing includes a corresponding rib for each of the two grooves.

[0033] Therefore, in a preferred embodiment, the rotor body includes a first front side having a first groove axially opposite to the bottom of the tank and a second front side having a second groove axially opposite to the housing cover. The housing tank includes a first rib projecting axially from the bottom of the tank, which engages in the first groove. Furthermore, the housing cover includes a second rib projecting axially, which engages in the second groove.

[0034] On at least one axially forward side, the rotor body, particularly by means of a stepped design, can include an axially projecting cylindrical portion radially inward, which is also referred to hereinafter as a cylindrical portion. Advantageously, the tooth backlash is at least partially formed in the cylindrical portion, specifically extending axially into the cylindrical portion. Furthermore, the cylindrical portion preferably protrudes beyond the second gear rotor stage.

[0035] The rotor body can be mounted in the housing using at least one corresponding cylindrical portion. For each corresponding cylindrical portion, the housing advantageously includes an axially inwardly pointing container in which the corresponding cylindrical portion engages.

[0036] In a preferred embodiment, the tooth gap is sealed by at least one of the cylindrical portions and / or at least one of the associated containers, thus achieving a seal between the gear rotor stages and / or relative to the tooth gap, and thus a seal between the gear rotor stages and the surrounding area. In particular, the cylindrical portions and the associated containers can be sealed radially. Therefore, in a preferred embodiment, at least one of the at least one cylindrical portion used for sealing is axially engaged within the associated container.

[0037] In an advantageous embodiment, the rotor body includes such cylindrical portions and housings for the respective cylindrical portions and associated containers on both axially frontal sides.

[0038] Therefore, in an advantageous embodiment, the rotor body includes a first cylindrical portion projecting axially toward the bottom of the tank, and the shell tank includes a first container pointing axially inward, the cylindrical portion being axially engaged in the first container. Furthermore, the rotor body includes a second cylindrical portion projecting axially toward the shell cover, and the shell cover includes a second container pointing axially inward, the second cylindrical portion being axially engaged in the second container.

[0039] Gear rotor devices are advantageously used in pumping equipment for pumping at least one fluid. The pumping equipment includes a cavity for housing the gear rotor device, through which the flow path of the at least one fluid will pass.

[0040] It is conceivable to use pumping equipment in motor vehicles to deliver at least one fluid, particularly a liquid, within the vehicle. For example, pumping equipment can be used to pump oil and / or lubricants. Therefore, such pumping equipment is particularly an oil pump.

[0041] For example, in motor vehicles, this pump device can supply fluid, particularly oil and / or lubricant, to the vehicle's transmission. This means that during operation, the pump device supplies fluid, particularly oil and / or lubricant, to the transmission via a gear rotor assembly.

[0042] It is conceivable that a gear rotor stage of a gear rotor device delivers and pumps the same fluid at different pumping stages (i.e., with different volumetric flow rates and / or pressures). Therefore, the fluid flow path passes through the cavity. It is conceivable to use one gear rotor stage as a pre-stage for another gear rotor stage. Specifically, the first gear rotor stage can be used as a pressure stage for fluid supply, particularly for oil supply, and the second gear rotor stage can be used as a suction stage to supply the first gear rotor stage.

[0043] Similarly, it is conceivable to transport at least two different fluids by means of a geared rotor device, wherein each fluid is assigned to at least one geared rotor stage. Thus, at least two flow paths pass through the container separately from each other.

[0044] Similarly, it is conceivable to deliver the same fluid in at least two independent loops using a geared rotor assembly, each loop being assigned a geared rotor stage. Thus, at least two flow paths pass through the cavity separately from each other. It is also conceivable to deliver fluid in different loops with different volumetric flow rates and / or pressures.

[0045] As an example, motor vehicles refer to consumables requiring low fluid pressure (e.g., in the case of electric vehicles, for cooling the traction motor), particularly oil consumables. Additionally, some consumables (especially oil consumables) require higher fluid pressures, such as for lubricating bearings and / or transmissions. Here, both consumables requiring low and higher fluid pressures can be supplied via a geared rotor stage. These consumables are advantageously integrated into different circuits. Pump equipment can be used in any application to pump any fluid.

[0046] It should be understood that such pump equipment and motor vehicles also fall within the scope of protection of this invention.

[0047] Other important features and advantages of the invention can be obtained from the dependent claims, the drawings, and the related description of the drawings with the aid of the accompanying drawings.

[0048] It should be understood that, without departing from the scope of protection of this invention, the features mentioned above and those to be explained below can be used not only in the various combinations described, but also in other combinations or individually. Attached Figure Description

[0049] Preferred exemplary embodiments of the present invention are shown in the accompanying drawings and explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical parts.

[0050] The following are schematically illustrated:

[0051] Figure 1 Axial plan view of the gear rotor assembly.

[0052] Figure 2 Isometric view of a pump unit with a geared rotor assembly.

[0053] Figure 3 In another exemplary embodiment, the cross-section of a pump device having a gear rotor assembly is shown.

[0054] Figure 4 An isometric view of a gear rotor assembly in another exemplary embodiment.

[0055] Figure 5 : Figure 4 A simplified side view of the gear rotor assembly shown.

[0056] Figure 6 A highly simplified circuit diagram representation of a pump device in a motor vehicle.

[0057] Figure 7 A highly simplified circuit diagram representation of a pump device in another exemplary embodiment. Detailed Implementation

[0058] Gear rotor device 1 (e.g., in Figures 1 to 7 (as shown) is used in pump equipment 100 (e.g. Figure 2 and Figure 3 as well as Figure 6 and 7 (as shown in the diagram) convey at least one liquid. For example, from... Figure 1 It is particularly evident that the gear rotor device 1 includes at least two gear rotor stages 2. In the exemplary embodiment shown, the gear rotor device 1 includes two gear rotor stages 2, namely a first gear rotor stage 2, 2a and a second gear rotor stage 2, 2b. Each gear rotor stage 2 includes an inner rotor 4 and an outer rotor 6. The inner rotor 4 rotates during operation about an inner axis 3 having radially outwardly projecting teeth 7. The outer rotor 6 rotates during operation about an outer axis 5 radially offset relative to the inner axis 3. The tooth backing 8 opens radially inward, and the teeth 7 of the inner rotor 4 engage in the tooth backing 8 during operation. Thus, the first gear rotor stage 2, 2a includes a first inner rotor 4, 4a and a first outer rotor 6, 6a. The first inner rotor 4, 4a rotates during operation about a first inner axis 3, 3a with first teeth 7, 7a projecting radially outward. The first outer rotor 6, 6a rotates during operation about a first outer axis 5, 5a radially offset relative to the first inner axis 3. The first tooth backing 8, 8a opens radially inward. During operation, the first tooth 7,7a of the first inner rotor 4,4a engages with the first tooth clearance 8,8a of the first outer rotor 6,6a. Similarly, the second gear rotor stage 2,2b includes a second inner rotor 4,4b and a second outer rotor 6,6b. During operation, the second inner rotor 4,4b rotates about a second inner axis 3,3b, with its second tooth 7,7b protruding radially outward. During operation, the second outer rotor 6,6b rotates about a second outer axis 5,5b that is radially offset relative to the second inner axis, with its second tooth clearance 8,8b opening radially inward. During operation, the second tooth 7,7b of the second inner rotor 4,4b engages with the second tooth clearance 8,8b of the second outer rotor 6,6b.

[0059] from Figures 1 to 3It is evident that the gear rotor assembly 1 includes a rotor body 10 that rotates about a rotor axis 9 during operation. The rotor body 10 includes radially open backlash 8,8a of a first gear rotor stage 2,2a and radially outwardly projecting teeth 7,7b of a second gear rotor stage 2,2b. In the exemplary embodiment shown, the rotor body 10 forms the inner rotor 4,4a of the first gear rotor stage 2,2a and the outer rotor 6,6b of the second gear rotor stage 2,2b. Therefore, the rotor body 10 includes the first radially inwardly open backlash 8,8a of the first gear rotor stage 2,2a and the second radially outwardly projecting teeth 8,8b of the second gear rotor stage 2,2b.

[0060] The “radial” direction referred to here refers to the respective axes 3, 5, and 9. Axis axes 3, 5, and 9 extend in parallel. The “axial” direction referred to here involves the respective axes 3, 5, and 9, where axial means extending parallel to or coaxial with the axis.

[0061] In the exemplary embodiment shown, the rotor body 10 is formed integrally and monolithically. For example, the rotor body 10 is a sintered component 11. Therefore, the rotor body 10 is made, for example, by sintering.

[0062] In the exemplary embodiment shown, the rotor axis 9 of the rotor body 10 forms the outer axis 5,5a of the first gear rotor stage 2,2a and the inner axis 3,3b of the second gear rotor stage 2,2b. Therefore, the arrangement of the rotor axis 9 of the rotor body 10 enables parallel operation of the two transmission stages 10. Figures 1 to 3 It is evident that the outer rotors 6,6b of the second gear rotor stages 2,2b are arranged to enclose the rotor body 10 in the exemplary embodiment. This means that the outer rotors 6,6b of the second gear rotor stages 2,2b radially outward surround the rotor body 10. Therefore, the first gear rotor stages 2,2a are radially inner gear rotor stages 2, and the second gear rotor stages 2,2b are radially outer gear rotor stages 2,2b of the gear rotor assembly 1.

[0063] In the exemplary embodiment shown, the gear rotor device 1 includes only... Figure 3 and Figure 5 The housing 15 shown in the figure houses the gear rotor stage 2. The housing 15 includes a housing 17, a radially extending housing bottom 18, and a housing cover 19, which closes the housing 17 and is axially opposite to the housing bottom 18.

[0064] from Figures 2 to 5It is evident that the tooth backing 8 of the gear rotor stage 2 and the gear rotor stage 2 relative to the surrounding area are fluidly sealed to each other. In this way, internal leakage of the gear rotor assembly 1 is avoided or at least reduced. Furthermore, this method prevents the gear rotor stage 2 (especially the tooth backing 8 of the gear rotor stage 2 operating at lower pressure levels) from drawing air from the surrounding area, or at least reduces such air intake.

[0065] exist Figures 1 to 3 In the exemplary embodiment shown, the rotor body for sealing the tooth gap 8 includes an axially open and circumferentially shaped groove 14 located at least on the axially front side 14, wherein the groove 14 is only located on the axially front side 14. Figure 1 The Chinese side indicated that...

[0066] exist Figure 1 and Figure 2 In the exemplary embodiment shown, on the axial front side 14, the rotor body 10 includes an axially open and circumferentially shaped groove 14, which is filled with a liquid (particularly oil) to seal the tooth gap 18.

[0067] exist Figure 3 In the exemplary embodiment shown, the rotor body 10 includes an axially open, circumferentially shaped recess 14 located on at least one axially frontal side 13. Furthermore, for the corresponding at least one recess 14, the housing 15 includes an axially projecting circumferential rib 16 for sealing tooth gaps 8, which engage in associated labyrinthine recess seals. Figure 3 In the exemplary embodiment shown, the rotor body 10 includes 14. Recesses 14 and associated ribs 16 interact with their respective front sides 13, recesses 14, and housings 15 and associated ribs 16 for the respective recesses 14. In the exemplary embodiment shown, the rotor body 10 includes a first front side 13,13a having a first recess 14,14a axially opposite to the bottom of the can 18, and the housing 17 and the first ribs 16,16a project axially from the bottom of the can engaging in the first recesses 14,14a. Furthermore, the rotor body 10 includes a second front side 13,13b having a second recess axially opposite to the housing cover 19, and the housing cover 19 project axially from the second ribs 16,16b engaging in the second recesses 14,14b.

[0068] exist Figures 1 to 3 In the exemplary embodiment shown, the teeth 7,7a and backlash 8,8a of the rotor body 10 are arranged at the same axial height. Figure 2 It is particularly evident that in these exemplary embodiments, the first inner rotor 4,4a, rotor body 10, and second outer rotor 6,6b have the same axial termination and are therefore axially positioned in the radial plane. Thus, a compact structure for the gear rotor assembly 1 is achieved.

[0069] Figure 4 and Figure 5 The exemplary embodiments shown are in accordance with Figures 1 to 3 The exemplary embodiment shown differs in that the rotor body 10 is axially trapezoidally formed on at least one axially front side 13. Therefore, the rotor body 10 includes at least two steps 12 radially offset relative to each other on the front side 13, the at least two steps 12 being axially merged together. In the exemplary embodiment shown, the rotor body 10 includes two such steps 12, namely radially inner steps 12, 12a and radially outer steps 12, 12b. The radially inner steps 12, 12a radially protrude beyond the outer rotor 6, 6b of the radially outer steps 12, 12b and the second gear rotor stage 2, 2b of the rotor body 10. Conversely, the radially inner steps 12, 12a axially terminate on the front side of the outer rotor 6, 6b having the second gear rotor stage 2, 2b. Therefore, the rotor body 10 includes an axially protruding cylindrical portion 20 on the step front side 13, which is also referred to hereinafter as a cylindrical portion. The cylindrical portion 20 axially protrudes beyond the second gear rotor stage 2, 2b. Furthermore, at least partially, tooth gaps 8 are formed in the cylindrical portion 20, such that the tooth gaps 8 extend into the cylindrical portion 20. In the illustrated exemplary embodiment, the first tooth gaps 8, 8a thereby extend into the cylindrical portion 20. To seal the teeth 8, only... Figure 5 The housing 15, shown in a simplified manner, includes a corresponding container 21 for the respective cylindrical portion 20, the cylindrical portion 20 for sealing the tooth gap 8 being axially engaged in the container 21. The cylindrical portion 20 is sealed within the corresponding container 21. Furthermore, the cylindrical portion 20 and the rotor body 10 can thus be mounted in the corresponding container 21 by means of the cylindrical portion 20.

[0070] from Figure 5 As can be clearly seen in the illustrated exemplary embodiment, the rotor body 10 includes a cylindrical portion 20 on each of its front sides 13. Therefore, the rotor body 10 includes first cylindrical portions 20, 20a projecting axially toward the bottom 18 of the tank, and the housing tank 17 includes first containers 21, 21a pointing axially inward, with the cylindrical portions 20, 20a axially engaged within the first containers 21, 21a. Furthermore, the rotor body 10 includes second cylindrical portions 20, 20b projecting axially toward the housing cover 19, and the housing cover 19 includes second containers 21, 21b pointing axially inward, with the second cylindrical portions 20, 20b axially engaged within the second containers 21, 21b.

[0071] also, Figure 4 and Figure 5 The exemplary embodiments shown are in accordance with Figures 1 to 3The difference in the illustrated exemplary embodiment is that the backlash 8,8b of the rotor body 10 axially protrudes beyond the teeth 7,7a of the rotor body 10. In the illustrated exemplary embodiment, the teeth 7,7a of the rotor body 10 axially protrude beyond the second outer rotor 6,6b. Additionally, the first teeth 7,7a axially protrude beyond the second outer rotor 6,6b. The first teeth 7,7a and the first backlash 8,8a can therefore have a larger axial range than the second teeth 7,7b and the second backlash 8,8b. Therefore, for example, the gear rotor stage 2,2a can transmit a larger torque compared to the second gear rotor stage 2,2b.

[0072] As from Figure 2 It is obvious and as Figure 6 and Figure 7 As shown, the pump device 100 includes a cavity 102, in which a gear rotor assembly 1 is arranged, and the cavity 102 conveys at least one liquid during operation. Therefore, by Figure 6 and Figure 7 The arrow in the diagram indicates that at least one liquid flow path 103 passes through cavity 102.

[0073] according to Figure 6 By means of the gear rotor stage 2, a single liquid can be transported through the gear rotor device 1, thereby pumping it in a stepped manner. Therefore, the flow path 103 passes through the cavity 22. According to... Figure 7 Two liquids or the same liquid can also be conveyed in two separate circuits via the gear rotor device 1. In particular, it is possible to convey liquids in circuits with different pressures or volumetric flow rates. Therefore, a gear rotor stage 2 is provided for the corresponding liquid. Thus, the first flow path 103, 103a and the second flow path 103, 103b pass through the cavity 102.

[0074] according to Figure 6 The pump device 100 can be used in the motor vehicle 200. In the motor vehicle 200, the pump device 100 can supply oil and / or a liquid lubricant to, for example, the transmission 201, thereby supplying oil and / or lubricant to the transmission. Therefore, the pump device 100 can be, in particular, an oil pump 104.

Claims

1. A gearwheel rotor device (1) for a pump apparatus (100), - having at least two gearwheel rotor stages (2), wherein each gearwheel rotor stage (2) comprises an inner rotor (4) which rotates around an inner axis (3) during operation, the inner rotor (4) having radially outwardly projecting teeth (7), and an outer rotor (6) which rotates around an outer axis (5) which is radially offset with respect to the inner axis (3) during operation, the outer rotor (6) having a radially inwardly open tooth gap (8) in which the teeth (7) of the inner rotor (4) engage, - wherein, a rotor body (10) which rotates around a rotor axis (9) during operation comprises radially open tooth gaps (8, 8a) of a first gearwheel rotor stage (2, 2a) and radially outwardly projecting teeth (7, 7b) of a second gearwheel rotor stage (2, 2b), - wherein the tooth gaps (8) of the gearwheel rotor stages (2) are fluid-tightly sealed with respect to one another and / or with respect to the surrounding area, - wherein the rotor body (10) comprises on at least one axial front side (13) an axially open and circumferential groove (14), - wherein the gearwheel rotor device (1) comprises a housing (15) in which the gearwheel rotor stages (2) are accommodated, - wherein for the respective at least one groove (14) the housing (15) comprises an axially projecting and circumferential rib (16) which engages in the associated groove (14) for sealing the tooth gap (8).

2. The gearwheel rotor device according to claim 1, characterized in that the rotor body (10) comprises on at least one axial front side (13) an axially open and circumferential groove (14) which is filled with a liquid for sealing.

3. The gearwheel rotor device according to claim 2, characterized in that the groove (14) is filled with oil.

4. The gearwheel rotor device according to claim 1, characterized in - that the housing (15) comprises a housing pot (17) having a radially extending pot bottom (18) and a housing cover (19) which closes the housing pot (17), the housing cover (19) being axially opposite the pot bottom (18), - that the rotor body (10) comprises a first front side (13, 13a) having a first groove (14, 14a) which is axially opposite the pot bottom (18) and the housing pot (17) comprises a first rib (16, 16a) which projects axially from the pot bottom (18), the first rib (16, 16a) engaging in the first groove (14, 14a), - that the rotor body (10) comprises a second front side (13, 13b) having a second groove (14, 14b) which is axially opposite the housing cover (19) and the housing cover (19) comprises a second rib (16, 16b) which projects axially, the second rib (16, 16b) engaging in the second groove (14, 14b).

5. The gearwheel rotor device according to any one of claims 1 to 4, characterized in - the rotor body (10) comprises on at least one axial front side (13) a radially inwardly and axially protruding cylinder portion (20), the tooth gap (8) being at least partially formed in the cylinder portion (20), and the cylinder portion (20) axially protruding beyond the second gear wheel rotor stage (2, 2b), - the gear wheel rotor device (1) comprises a housing (15), the gear wheel rotor stage (2) being accommodated in the housing (15), - for the respective cylinder portion (20), the housing (15) comprises an associated receptacle (21) for axially engaging the cylinder portion (20) of the tooth gap (8) in the receptacle (21).

6. Gear wheel rotor device according to claim 5, characterized in that - the housing (15) comprises a housing pot (17) with a radially extending pot bottom (18) and a housing cover (19) closing the housing pot (17), the housing cover (19) axially lying opposite the pot bottom (18), - the rotor body (10) comprises a first cylinder portion (20, 20a) axially protruding in the direction of the pot bottom (18), and the housing pot (17) comprises a first receptacle (21, 21a) axially pointing inwards, the cylinder portion (20, 20a) being axially engaged in the first receptacle (21, 21a), - the rotor body (10) comprises a second cylinder portion (20, 20b) axially protruding in the direction of the housing cover (19), and the housing cover (19) comprises a second receptacle (21, 21b) axially pointing inwards, the second cylinder portion (20, 20b) being axially engaged in the second receptacle (21, 21b).

7. Gear wheel rotor device according to any one of claims 1 to 4, characterized in that the rotor body (10) forms an outer rotor (6, 6a) of the first gear wheel rotor stage (2, 2a) and an inner rotor (4, 4b) of the second gear wheel rotor stage (2, 2b).

8. Gear wheel rotor device according to any one of claims 1 to 4, characterized in that the rotor body (10) is integrally formed.

9. Gear wheel rotor device according to any one of claims 1 to 4, characterized in that the rotor body (10) is a sintered component (11).

10. Pump device (100) for pumping at least one liquid, having a cavity (102), at least one flow path (103) passing through the cavity (102), and having arranged in the cavity (102) a gear wheel rotor device (1) according to any one of claims 1 to 9, the gear wheel rotor device (1) conveying the at least one liquid during operation.

11. Motor vehicle (200) having a transmission (201) and a pump device (100) according to claim 10, wherein the pump device (100) supplies the transmission (201) with liquid during operation.

12. Motor vehicle (200) according to claim 11, wherein the pump device (100) supplies oil to the transmission (201) during operation.

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