Cycloid rotor electronic pump with motor rotor integrated in external gear

Abstract

The cycloid rotor electronic pump (1) according to the invention allows an electric motor (9) to be integrated into the cycloid rotor electronic pump (1) by forming permanent magnets (7) on the outer circumference (6) of an external gear (2) which can be surrounded on the outside by a stator (10) in order to form the electric motor (9). As a result, an additional connection between the electric motor (9) and the cycloidal rotor electronic pump (1) can be omitted, such that axial installation space and cost are saved. At the same time, the external gear (2) and the internal gear (3) act as a transmission, via which additional elements (not shown here) can be driven via a drive shaft (11) connected to the internal gear (3) in a rotationally fixed manner.

Description

Technical Field

[0001] The invention relates to a cycloidal rotor electronic pump, in which an integrated rotor of an electric motor is formed by integrating a permanent magnet in an external gear. Background Art

[0002] Cycloid rotor electronic pumps are considered to be known. They have an external gear with an internal toothing and an internal gear with an external toothing located in the external gear, wherein the internal gear has one less tooth than the external gear. Usually, the electric motor is connected to the external gear or the internal gear via a shaft attachment. This is disadvantageous in particular in space-critical applications. Such space-critical applications exist, for example, in automobile construction, in which cycloid rotor electronic pumps can be used as drives for hydraulic actuators. Summary of the invention

[0003] Based on this, the invention is based on the object of at least partially overcoming the problems known from the prior art.

[0004] The object is achieved by means of the features of the independent claim 1. Further advantageous embodiments of the invention are described in the dependent claims. The features listed individually in the dependent claims can be combined with one another in a technically meaningful manner and can define further embodiments of the invention. In addition, the features described in the claims are described and elaborated in detail in the description, wherein further preferred embodiments of the invention are shown.

[0005] The cycloidal rotor electronic pump according to the present invention comprises an internally toothed external gear rotatable about an external axis and an externally toothed internal gear rotatable about an internal axis, wherein the external axis and the internal axis are oriented parallel to each other, wherein the internal gear has an internal number of teeth, the internal number being at least two, and the external gear has an external number of teeth, wherein the external number is at least one greater than the internal number, and the internal gear is constructed inside the external gear, and the cycloidal rotor electronic pump is characterized in that a plurality of permanent magnets are constructed integrally with the external gear at the outer circumference of the external gear.

[0006] By configuring the external gear with permanent magnets, the external gear can simultaneously serve as the rotor of the electric motor. Therefore, the electric motor can be directly integrated into the cycloid rotor electronic pump without further attachment, for example via a shaft. As a result, the structural space required in the axial direction for installing the cycloid rotor electronic pump is reduced.

[0007] The outer number and the inner number are natural numbers, wherein the outer number is greater than the inner number by at least one, preferably by one. Thus, when the outer gear and the inner gear rotate, a volume that continuously changes and thus generates negative pressure and excess pressure is generated between the teeth of the outer gear and the inner gear, through which the liquid can be conveyed.

[0008] The cycloid rotor electronic pump can preferably be used as a pump for conveying a hydraulic medium, such as in particular hydraulic oil. In particular, it is preferably used in motor vehicle construction, wherein the cycloid rotor electronic pump is used to supply one or more consumers with a hydraulic medium. Such consumers are in particular hydraulic actuators. Such actuators are preferably used, for example, to actuate a clutch or the like.

[0009] Preferably, the outer gear and the inner gear are made of plastic such as polyethylene, polyamide and / or fiber-reinforced plastic such as glass fiber and / or carbon fiber reinforced plastic. The permanent magnets are preferably distributed identically in the circumferential direction. The inner axis and the outer axis are parallel, but not coaxial.

[0010] Preferably, the external gear forms the rotor of the electric motor, which is surrounded on the outside by the stator. The electric motor can thus be connected directly to the cycloid rotor electronic pump to form a unit. The external gear or rotor acts as an inner rotor in this case.

[0011] Preferably, the permanent magnets are bonded to the external gear. This allows the external gear or the rotor to be formed in a simple manner. If the external gear is sprayed with plastic, for example, a recess is formed in the external gear. The permanent magnets are then bonded into the recess.

[0012] Preferably, the permanent magnet is connected to the external gear in a form-fitting manner, in particular by encapsulation by injection molding. This allows efficient and rapid production of the external gear or the rotor.

[0013] Preferably, the drive shaft for driving the other element is effectively connected to the internal gear. In particular, the drive shaft is connected to the internal gear by material fit or via a toothed portion or a flywheel mechanism. This can achieve the attachment and driving of the other element by the electric motor. The drive shaft is led out of the cycloid rotor electronic pump and attached to the other element.

[0014] Preferably, the inner axis is coaxial with the drive shaft. This allows a simple design of the drive of the further element.

[0015] Preferably, the external gear and the internal gear are configured so that a transmission ratio between the rotational speed of the electric motor and the rotational speed of the drive shaft is preset. This makes it possible to drive other elements at a specific transmission ratio without having to form an additional transmission. For example, actuation, such as a parking brake, etc., can be performed via the drive shaft. By means of the speed transmission ratio between the external gear and the internal gear, a mechanical transmission for reducing the speed and increasing the torque can preferably be omitted. In the described case, the cycloid rotor electronic pump can be used directly as a transmission transmission. In the described case, the sensor target can transmit the rotation angle or speed information of the internal gear or the drive shaft by means of a sensor arranged at the internal gear or the drive shaft. Preferably, the flywheel mechanism is additionally integrated centrally into the internal gear so as to selectively drive or not drive the drive shaft by reversing the rotation direction of the electric motor.

[0016] It should be noted as a precaution that the numerals used here ("first", "second", ...) serve primarily (only) to distinguish between a plurality of identical objects, quantities or processes, i.e., in particular do not necessarily prescribe a correlation and / or sequence of the objects, quantities or processes with respect to one another. If a correlation and / or sequence is required, this is explained in detail here or becomes self-evident to a person skilled in the art upon studying the specifically described configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention and the technical field are explained in detail below with reference to the accompanying drawings. It should be noted that the present invention should not be limited by the illustrated embodiments. In particular, if not explicitly stated otherwise, it is also possible to extract sub-aspects of the facts illustrated in the drawings and combine them with other components and knowledge in this specification and / or the drawings. It should be noted in particular that the drawings and in particular the size relationships shown are only schematic. The same reference numerals represent the same objects, so that the explanations from other drawings can be used in addition if necessary. The drawings show:

[0018] Figure 1 A first view showing one example of a cycloidal rotor electronic pump; and

[0019] Figure 2 A second view showing one example of a gerotor electronic pump. DETAILED DESCRIPTION

[0020] Figure 1 A cross-sectional view of a cycloidal rotor electronic pump 1 is schematically shown. The cycloidal rotor electronic pump includes an external gear 2 with internal teeth and an internal gear 3 with external teeth, and the internal gear is formed inside the external gear 2. The number of teeth of the external gear 2 is called the external number, and the number of teeth of the internal gear 3 is called the internal number. The internal number is a natural number and is at least two. The external number is one greater than the internal number. In this example, the external number is eight, and the internal number is seven.

[0021] The outer gear 2 can rotate around the outer axis 4, and the inner gear 3 can rotate around the inner axis 5. The inner axis 5 and the outer axis 4 are parallel, but not coaxial. That is, there is a small spacing between the inner axis 5 and the outer axis 4. The inner axis 5 and the outer axis 6 are at Figure 1 Shown as points.

[0022] The cooperation of the external gear 2 and the internal gear 3 produces a pumping action which can be used, for example, to convey a hydraulic medium, in particular in a hydraulic control system such as a hydraulic actuator in a motor vehicle. The external gear 2 and the internal gear 3 are preferably made of plastic, in particular polyethylene, polyamide and / or fiber-reinforced plastic.

[0023] The external gear 2 has a plurality of permanent magnets 7, eight in this case, on its outer circumference 6, which are only partially provided with reference numerals for the sake of overview. The permanent magnets 7 are evenly distributed on the outer circumference 6 in the circumferential direction. The permanent magnets 7 are formed integrally with the external gear 2, in particular, are bonded or injection-molded with the external gear. By forming the permanent magnets 7, the external gear 2 can simultaneously act as the rotor 8 of the electric motor 9. The rotor 8 is formed in the stator 10 of the electric motor 9. By the integration of the electric motor 9 into the cycloidal rotor electronic pump 1, an additional attachment between the cycloidal rotor electronic pump 1 and the electric motor 9 for driving the cycloidal rotor electronic pump 1 can be prohibited. Therefore, the shaft connection between the cycloidal rotor electronic pump 1 and the electric motor 9 can be stopped, so that axial structural space is saved.

[0024] The drive shaft 11 is effectively connected to the internal gear 3, and the drive wheel is led out of the cycloid rotor electronic pump 1. Via the drive shaft 111, other elements not shown here can be driven by the electric motor 9. Through the design of the external gear 2 and the internal gear 3 and especially the external number and the internal number, transmission can be achieved between the electric motor 9 and the drive shaft 11, so that the construction scheme of an additional transmission can be omitted here. Therefore, the cycloid rotor electronic pump 1 can be directly used as a transmission transmission for the drive shaft 11.

[0025] Figure 2 The cycloid rotor electronic pump 1 is shown in the closed state. Here, the electric motor 9 is covered by a housing 12. The electric motor 9 is powered via a plug connector 13 and a control unit 14 is controlled, which controls the electric motor 9. In addition, the cycloid rotor electronic pump 1 comprises a first hydraulic connector 15 and a second hydraulic connector 16. A connection is made to a reservoir for hydraulic medium (not shown) via one of the hydraulic connectors 15, 16, and hydraulic medium from the reservoir can be supplied to the consumer device via the other hydraulic connectors 16, 15, respectively. Other elements can be driven via the drive shaft 11.

[0026] The cycloid rotor electronic pump 1 proposed here allows the electric motor 9 to be integrated into the cycloid rotor electronic pump 1 by forming the permanent magnet 7 at the outer circumference 6 of the external gear 2, and the external gear can be surrounded by the stator 10 on the outside to form the electric motor 9. As a result, the additional connection between the electric motor 9 and the cycloid rotor electronic pump 1 can be omitted, so that the axial structural space is saved and the cost is saved. At the same time, the external gear 2 and the internal gear 3 act as a transmission, through which another element (not shown here) can be driven via the drive shaft 11 connected to the internal gear 3 in a rotationally fixed manner.

[0027] Reference numerals list

[0028] 1 Cycloid rotor electronic pump

[0029] 2 External gear

[0030] 3 Internal gear

[0031] 4 External axis

[0032] 5 Inner axis

[0033] 6 Outer ring

[0034] 7 permanent magnets

[0035] 8 Rotor

[0036] 9 Electric Motor

[0037] 10 Stator

[0038] 11 Drive shaft

[0039] 12 Housing

[0040] 13 Connector

[0041] 14 Control Unit

[0042] 15 First hydraulic joint

[0043] 16 Second hydraulic connector

Claims

1. A cycloidal rotor electronic pump (1), comprising an internally toothed external gear (2) rotatable about an external axis (4) and an externally toothed internal gear (3) rotatable about an internal axis (5), wherein the external axis (4) and the internal axis (5) are oriented parallel to each other, wherein the internal gear (3) has an internal number of teeth, the internal number being at least two, and the external gear (2) has an external number of teeth, wherein the external number is at least one greater than the internal number, and the internal gear (3) is formed inside the external gear (2), characterized in that A plurality of permanent magnets (7) are formed integrally with the external gear (2) on the outer circumference (6) of the external gear (2).

2. The cycloid rotor electronic pump (1) according to claim 1, wherein the external gear (2) forms a rotor (8) of an electric motor (9), which rotor is surrounded on the outside by a stator (10).

3. A cycloid rotor electronic pump (1), wherein the permanent magnet (7) is bonded to the external gear (2).

4. The cycloid rotor electronic pump (1) according to claim 1, wherein the permanent magnet (7) is connected to the external gear (2) in a form-fitting manner, in particular by encapsulation by injection molding.

5. The cycloid rotor electronic pump (1) according to any one of the preceding claims, wherein a drive shaft (11) for driving another element is operatively connected to the internal gear (3).

6. The cycloid rotor electronic pump (1) according to claim 5, wherein the drive shaft (11) is connected to the internal gear (3) by material fit.

7. The cycloid rotor electronic pump (1) according to claim 5, wherein the drive shaft (11) is connected to the internal gear (3) via a tooth portion.

8. The cycloid rotor electronic pump (1) according to claim 5, wherein the drive shaft (11) is connected to the internal gear (3) via a flywheel mechanism.

9. The cycloid rotor electronic pump (1) according to any one of claims 5 to 8, wherein the drive shaft (11) is coaxial with the inner axis (5).

10. The cycloid rotor electronic pump (1) according to any one of claims 5 to 9, wherein the external gear (2) and the internal gear (3) are configured so as to predetermine a transmission ratio between a rotational speed of the electric motor (9) and a rotational speed of the drive shaft (11).

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