Motor rotor device

Abstract

The invention relates to an electric motor rotor arrangement (2), comprising a central longitudinal axis (Z) which runs through the electric motor rotor arrangement (2), at least two structural elements (4, 6, 8) which are arranged coaxially to the central longitudinal axis (Z), and at least one elastic element (10, 12) which is arranged in a radial direction (R) between the at least two structural elements (4, 6, 8), the respective structural elements (4, 6, 8) are connected to each other such that they can move relative to each other.

Description

[0001] The present invention relates to an electric motor rotor device as described in the preamble of claim 1.

[0002] An electric motor includes a stator and a rotor. The rotor, usually integral, as a rotating component may generate noise, vibration, and running jitter. However, the NVH (noise, vibration, harshness) performance of known rotors is not ideal.

[0003] The first NVH source may exist in the electric motor itself. Due to fluctuations in the magnetic field or torque pulses, torque fluctuations (torsional vibrations) are imposed on the rotating rotor. The second NVH source may lie in the transmission of noise and vibration through the structure along the vibration path. Torsional vibrations are transmitted through the transmission, differential, and half shafts or shafts, as well as the electric motor and / or transmission housing. The electric motor and / or transmission housing radiate airborne noise outward. The vibrations of the driveline generate airborne noise along its length on the components connected thereto.

[0004] So far, there has been no known satisfactory solution to effectively avoid or reduce the noise and vibration of the rotor transmitted to the vehicle body or wheels.

[0005] Therefore, the task of the present invention is to make corresponding improvements to the prior art.

[0006] The main features of the present invention are given in the characterizing part of claim 1. Claims 2 to 9 relate to specific embodiments of the present invention.

[0007] According to the present invention, there is provided an electric motor rotor device, which includes a central longitudinal axis passing through the electric motor rotor device, and at least two structural elements arranged coaxially with the central longitudinal axis, wherein the electric motor rotor device includes at least one elastic element, which is arranged radially between the at least two structural elements and connects the corresponding structural elements to be relatively movable with respect to each other.

[0008] The so far known and inherently rigid rotor is supplemented by the torsional elasticity generated by the elastic element. In this way, an electric motor rotor device is created, which is separated into two mutually movable structural elements, and these structural elements can be regarded as mass blocks or are themselves mass blocks. These structural elements can be rigid structural elements. Such vibration decoupling prevents the transmission of noise and vibration along the vibration transmission path through the rotor.

[0009] These structural elements can be independent components, such as a rotor shaft and a rotor body. However, the first and second structural elements can also be parts of a single component, such as a radially inward rotor shaft section and a radially outward rotor shaft section. This shows the variability of the present invention. Due to the coaxial arrangement, the longitudinal axis of the structural element coincides with the central longitudinal axis.

[0010] These structural elements can be arranged coaxially with the central longitudinal axis, with one of the two structural elements arranged outside the other on the outer circumference. An elastic element is arranged in the radial gap between the two structural elements. The elastic element can be an elastomeric sleeve.

[0011] According to a possible embodiment of the motor rotor device, it can also include three structural elements, such as a rotor shaft, a rotor body, and a transmission input gear. It is conceivable that these three structural elements are arranged in sequence along a vibration path, preferably directly in sequence. Thus, for example, two of the structural elements can be connected to the third structural element respectively through an elastic element.

[0012] According to a possible embodiment of the motor rotor device, at least two structural elements are connected only by a single elastic element. In this way, space can be saved and vibration decoupling can be effectively achieved.

[0013] According to another embodiment of the motor rotor device, the elastic element can be an elastomeric spring, preferably made of a magneto-active elastomer. The elastomer itself has a relatively low manufacturing cost and has sufficient elastic properties, especially in terms of vibration decoupling. By using an elastomer, the materials that the magnetic field in the motor may act on are reduced. Therefore, it is preferred to use a magneto-active elastomer. The magneto-active elastomer has a higher magnetic permeability compared to the corresponding values of pure elastomer materials. In this way, an elastic element with a significantly higher magnetic permeability can be achieved. Therefore, the magnetic field of the motor can act on the rotor as well as possible while achieving vibration decoupling.

[0014] A magneto-active elastomer can be a composite material composed of an elastomer matrix and magnetizable particles embedded therein, especially iron particles with a high saturation magnetization. In this way, other advantages can also be obtained when a magnetic field is applied. Now, the spring stiffness can be influenced by these particles because the reversible change of the viscoelastic properties is related to the magnetic field strength, such as the increase in the storage modulus G' and the loss modulus G". In other words, the elastic element made of a magneto-active elastomer can become harder as the magnetic field strength increases and softer as the magnetic field strength decreases.

[0015] According to another embodiment of the motor rotor device, an inertial mass can be arranged on a structural element on the side of the elastic element facing the central longitudinal axis. The inertial mass can be an independent component and / or not perform other functions. In this way, the degree of vibration decoupling in terms of frequency range and level can be improved, especially in an embodiment where the inertial mass is arranged on a structural element supported by bearings so that the structural element is "freely suspended". For example, the rotor shaft can be freely suspended. It is also conceivable that the inertial mass is arranged along a vibration path on a structural element supported by bearings and between two elastic elements. In particular, in this way, the degree of vibration decoupling can be improved.

[0016] According to another embodiment of the motor rotor device, the elastic element can form a form-fit with at least one of at least two structural elements. The form-fit can act circumferentially. In this way, the elastic element and the adjacent structural element do not rotate relative to each other around the central longitudinal axis in a dangerous manner, thus avoiding excessive torsion. Therefore, this embodiment enables the device to continue operating in the event of failure of the elastic element. This form-fit can be achieved, for example, by a toothed or corrugated profile on the circumferential side of the elastic element extending in the circumferential direction. It is also conceivable that both circumferential sides of the elastic element have profiles, thus forming a toothed or corrugated shape in the circumferential direction. It is conceivable that the corresponding structural element has a circumferential profile corresponding to the circumferential profile. Preferably, the two structural elements arranged on both sides of the elastic element have an overlapping portion in the circumferential direction. In this way, the elastic element can be squeezed between these overlapping portions, thus avoiding shear of the elastic element and the resulting damage.

[0017] According to another embodiment of the motor rotor device, the elastic element can include at least one tapered cavity. The tapered cavity can extend completely or only partially through the elastic element in the longitudinal direction, where preferably the tapered cavity is completely surrounded by the material of the elastic element on the circumferential side to achieve an optimal tapering effect. Since the tapered cavity extends in the longitudinal direction, the tapering effect acts circumferentially. The tapered cavity results in a tapered torsional characteristic curve (softer during normal operation / harder during torsional shock), because when the torsional angle between the two structural elements reaches a certain degree, the tapered cavity closes on both radial sides of the elastic element.

[0018] According to another embodiment of the motor rotor device, the elastic element may include a separating element that divides the elastic element into two radially adjacent elastic element segments. In this way, preferably, the radial stiffness is increased without changing the torsional stiffness. Thus, it is also possible to achieve a ratio of torsional stiffness to radial stiffness that is as low as possible. The elastic element segments may have the same radial thickness in the longitudinal direction and / or in the circumferential direction to achieve uniform stress. The separating element may be a separating sleeve, and the two elastic element segments are arranged on the separating sleeve in the radial direction, preferably connected in a material-bonded manner, more preferably connected by vulcanization. The separating element may be made of plastic, preferably made of thermoplastic, or made of a metallic material. The advantage of the separating element is that it only needs to separate the two elastic element segments in the radial direction, so it itself can have a very small radial thickness, for example, less than 1 mm.

[0019] According to another embodiment of the motor rotor device, the elastic element may have at least one corrugation that projects radially and extends in the longitudinal direction. Preferably, the elastic element may have at least one outer corrugation that projects radially outward and extends in the longitudinal direction and / or at least one inner corrugation that projects radially inward and extends in the longitudinal direction. In addition, at least one of the at least two structural elements may have a corrugation recess corresponding to the corrugation, outer corrugation, or inner corrugation, and at least one corrugation, outer corrugation, or inner corrugation is embedded in the corrugation recess, preferably having a radially outward corrugation recess and / or a radially inward corrugation recess.

[0020] Also in this way, the elastic element and at least one structural element including a corrugation recess and adjacent to the elastic element do not rotate relative to each other around the central longitudinal axis in a dangerous manner, thus avoiding excessive torsion. This is especially applicable to an elastic element that is not materially connected to two radially adjacent structural elements. It is conceivable that the elastic element includes a separating element, where the separating element forms a corrugation, outer corrugation, or inner corrugation, for example, by increasing the material thickness, such that the separating element has a greater radial material thickness in the corrugation, outer corrugation, or inner corrugation region than in the region without the corrugation, outer corrugation, or inner corrugation, or for example, by means of a circumferential profile, such that the separating element has the same radial material thickness in the corrugation, outer corrugation, or inner corrugation region and in the region without the corrugation, outer corrugation, or inner corrugation. In the first case, a very rigid separating element can be formed, where the corrugation, outer corrugation, or inner corrugation itself has little or only very little flexibility. In the second case, a lower-cost separating element can be formed, and its circumferential profile can be manufactured, for example, by molding. It is conceivable that the separating element has a constant radial material thickness in the circumferential direction. The elastic element segments may have the same radial thickness in the longitudinal direction and / or in the circumferential direction to achieve uniform stress.

[0021] At this time, a corrugation, an outer corrugation or an inner corrugation is embedded in the corresponding corrugation recess. If the elastic element also has a separating element, then this structure simultaneously serves to prevent torsion and increase the radial stiffness without changing the torsional stiffness.

[0022] According to a possible embodiment of the motor rotor device, the number of the outer corrugations and the inner corrugations of the elastic element can be the same, and the outer corrugations and the inner corrugations can be arranged offset in the radial direction. Therefore, the adjacent outer corrugations and inner corrugations can be offset from each other by an offset angle in the range of 5° to 10° with respect to the central longitudinal axis. In this way, a torsional gradient effect of vibration decoupling can be achieved. For example, due to the offset arrangement, when two structural elements twist on the radial two sides of the elastic element around the central longitudinal axis, the distance between two reference points on the structural elements will decrease, for example, from a curve track or a gradient inclined plane on one structural element to a curve track or a gradient inclined plane on the other structural element. The air gap that may exist circumferentially between the outer corrugation or the inner corrugation and the corresponding structural element may close with torsion, and then the elastic element will also squeeze the corresponding structural element at this position. In this way, the decoupled torsional gradient effect is achieved.

[0023] According to another embodiment of the motor rotor device, at least one corrugation recess can form a curve track and / or a gradient inclined plane. When a relative movement occurs circumferentially between a structural element having the corresponding corrugation recess and the elastic element, the corrugation, the outer corrugation or the inner corrugation can slide along the curve track and / or the gradient inclined plane and is thus subjected to a radially inward or radially outward force. This especially also applies to the elastic element that has no material connection with two radially adjacent structural elements. The gradient characteristic can also be achieved through the curve track and the gradient inclined plane, especially when the elastic element includes a separating element. Through the relative movement in the circumferential direction, the curve track and the gradient inclined plane define a movement direction with a radial component for the corresponding corrugation, outer corrugation or inner corrugation, so that the elastic element is subjected to a force in the radial direction. A radially outward curve track or gradient inclined plane will result in a radially inward force, and a radially inward curve track or gradient inclined plane will result in a radially outward force.

[0024] According to a possible embodiment of the motor rotor device, the curved track can have a tendency to flatten towards the circumferential surface of the elastic element. In this way, as the torsional angle increases, the force exerted on the elastic element in the radial direction becomes greater and greater, thus producing a good gradual change effect. It is conceivable that the corrugated recesses on the outer circumference each form a curved track, and the flattening direction of this curved track is opposite to that of the curved track formed by the corrugated recesses on the inner circumference. Therefore, these curved tracks have opposite tendencies in the circumferential direction. In this way, the direction of relative movement in the circumferential direction is irrelevant, because the gradual change characteristics can be achieved in both directions.

[0025] According to a possible embodiment of the motor rotor device, the tapered inclined surface can have a flat tendency and / or be inclined relative to the radial direction, that is, form an inclination angle with the radial direction. The gradual change characteristics can be adjusted through this angle. It is conceivable that the corrugated recesses form two tapered inclined surfaces, that is, one on each side of the circumferential corrugation, outer corrugation or inner corrugation, and preferably the inclination angles of the two tapered inclined surfaces of a corrugated recess are the same in order to achieve the same gradual change characteristics independent of the direction of relative movement in the circumferential direction.

[0026] According to another embodiment of the motor rotor device, in the circumferential direction, an air gap can be arranged between the corrugation, outer corrugation or inner corrugation and the corresponding corrugated recess. This air gap can exist over the entire radial overlap height between the corrugation, outer corrugation or inner corrugation and the corresponding corrugated recess. It is conceivable that an air gap is arranged on each side of the corrugation, outer corrugation or inner corrugation in the circumferential direction. In this way, the corrugation, outer corrugation or inner corrugation can maintain a certain distance from the adjacent structural elements on both sides in the circumferential direction in order to achieve a decoupled torsional gradual change effect independent of the direction of relative movement in the circumferential direction. Because when two structural elements twist on both radial sides of the elastic element around the central longitudinal axis, the corresponding air gap will first close, and then the elastic element will contact the structural element at that place.

[0027] According to a possible embodiment of the motor rotor device, at least one bearing can be provided, preferably a sliding bearing or a rolling bearing, which supports at least one structural element on a housing, especially on a motor housing, and / or on a flywheel. Through this bearing, especially a rolling bearing, the radial and / or gimbal and / or axial degrees of freedom can be eliminated. For example, in order to meet the requirements of high clearance dimensions and imbalance requirements, eliminating these degrees of freedom may be beneficial. However, the torsional degree of freedom that affects vibration decoupling still exists.

[0028] According to a possible embodiment of the motor rotor device, the maximum radial thickness of the elastic element or elastic element segment can be 4 mm. Thus, the sum of the respective radial thicknesses of two elastic element segments can be at most 4 mm. These dimensions represent a favorable compromise between sufficient vibration decoupling and the smallest possible magnetic field influence.

[0029] According to a possible embodiment of the motor rotor device, one of the structural elements can be the rotor shaft, and at least one elastic element is supported by this rotor shaft. The rotor shaft can be a solid shaft, a hollow shaft or a hub. Due to the inertia of the rotor shaft, arranging the elastic element on the rotor shaft produces a favorable vibration decoupling effect in the torsional direction above a specific frequency, thereby reducing the high-frequency noise level.

[0030] According to a possible embodiment of the motor rotor device, one of the structural elements can be the rotor body, and at least one elastic element abuts against the rotor body. In this way, the elastic element can decouple the vibration of the rotor body from another structural element (such as the rotor shaft). The rotor body can be formed as a lamination stack and / or serve as a carrier for permanent magnets. The body can be connected to the rotor shaft by an elastic element. The body can have a substantially cylindrical shape and extend along the rotational axis of the rotor shaft. When the elastic element is arranged between the rotor body and the rotor shaft, the elastic element makes the rotor shaft a "freely suspended torsional element", and due to its own inertia, in addition to its main task (force transmission), it also serves as a vibration decoupling function. This shows the variability of the present invention.

[0031] According to a possible embodiment of the motor rotor device, one of the structural elements can be the transmission input gear, and at least one elastic element abuts against the transmission input gear. In this way, the elastic element can decouple the vibration of the transmission input gear from another structural element (such as the rotor shaft). When the elastic element is arranged between the transmission input gear and the rotor shaft, the elastic element makes the rotor shaft a "freely suspended torsional element", and due to its own inertia, in addition to its main task (force transmission), it also serves as a vibration decoupling function. This also shows the variability of the present invention.

[0032] According to a possible embodiment of the motor rotor device, the first elastic element can be arranged between the rotor body and the rotor shaft, and the second elastic element can be arranged between the transmission input gear and the rotor shaft. The setting of such two elastic elements creates torsional elasticity at two low-torque positions (such as on the primary side of the transmission), and a certain inertia is achieved by the rotor shaft between these two positions, which advantageously achieves significant torsional vibration decoupling above a specific frequency, thereby reducing the high-frequency noise level.

[0033] According to a possible embodiment of the electric motor rotor device, at least two structural elements can be the first and second parts of the rotor shaft, or the first and second parts of the rotor base body, or the first and second parts of the transmission input gear. In this way, the elastic element can be arranged inside a single component, which is thus divided into two parts.

[0034] According to a possible embodiment of the electric motor rotor device, at least one elastic element can be connected to one or two radially adjacent structural elements in a material-bonded manner (preferably by vulcanization bonding), or arranged between two radially adjacent structural elements without material bonding. Material bonding enables a low-cost and durable connection. The non-material-bonded arrangement (where at least one elastic element is fixed by form-fitting and / or force-fitting) enables relative movement of the elastic element with respect to at least one adjacent structural element and, with a suitable structural design, also enables a gradual change characteristic.

[0035] Other features, details and advantages of the present invention will result from the content of the claims and the following description of the embodiments in conjunction with the drawings. Among them:

[0036] Figure 1 is a longitudinal sectional view of an electric motor - transmission - unit having an electric motor rotor device;

[0037] Figure 2 is a cross-sectional view of two structural elements having an elastic element;

[0038] Figure 3 is a cross-sectional view of an elastic element segment;

[0039] Figure 4 is a longitudinal sectional view of an elastic element segment;

[0040] Figure 5 is a cross-sectional view of two structural element parts having an elastic element;

[0041] Figure 6 is a cross-sectional view of two structural elements having an elastic element in another embodiment;

[0042] Figure 7 is a cross-sectional view of two structural elements having an elastic element in another embodiment; and

[0043] Figure 8 is a graph showing the relationship between the torsional vibration amplitude and the excitation frequency.

[0044] In the figures, the same or corresponding elements are denoted by the same reference numerals, and thus, unless necessary, they will not be described repeatedly. To avoid repetition, features that have been described will not be elaborated further, and these features apply to all elements with the same or corresponding reference numerals unless explicitly excluded. The disclosure contained throughout the description applies correspondingly to the same parts with the same reference numerals or parts with the same component names. In addition, the positional descriptions chosen in the description (such as upper, lower, side, etc.) are with respect to the directly described and shown figures, and should apply to the new positions according to their meaning when the position changes. In addition, the individual features or combinations of features in the different embodiments shown and described may themselves constitute independent, inventive, or solutions in accordance with the present invention.

[0045] Figure 1 A longitudinal sectional view of an electric motor 31 is shown, which includes an electric motor housing 32. The transmission 30 is flange-connected to the electric motor 31, and the transmission includes a transmission housing 34. The electric motor 31 includes a stator 24 and an electric motor rotor device 2, which is penetrated by a central longitudinal axis Z in the longitudinal direction L. From this, a radial direction R extends, and a circumferential direction U extends around the central longitudinal axis Z.

[0046] In the example shown, the electric motor rotor device 2 includes three rigid structural elements 4, 6, 8, where the structural element 4 is a rotor shaft 4a. Here, it is shown as a hollow shaft and is penetrated in the longitudinal direction L by a drive shaft 28, which can connect the transmission 30 to a wheel (not shown). The rotor shaft 4a is supported on the electric motor housing 32 and on a flywheel 48 by bearings 26.

[0047] Another structural element 6 is a rotor core 6a. The rotor core 6a is formed as a laminated core and / or serves as a carrier for permanent magnets. The structural elements 4, 6 (i.e., the rotor shaft 4a and the rotor core 6a) are arranged coaxially with the central longitudinal axis Z, where the rotor core 6a is arranged outside the rotor shaft 4a on the circumferential outer side. In the radial direction R, an elastic element 10 in the form of a sleeve-shaped elastomeric spring 14 is arranged between the rotor shaft 4a and the rotor core 6a. The elastic element 10 is vulcanized-connected there. Through the elastic element 10, the rotor shaft 4a and the rotor core 6a are vibrationally decoupled, where the rotor shaft 4a and the rotor core 6a are connected only by one elastic element 10.

[0048] Another structural element 8 is the transmission input gear 8a. The transmission input gear 8a is the first gear in the transmission 30 facing the electric motor 31. The transmission input gear 8a is also arranged coaxially with the central longitudinal axis Z, where the transmission input gear 8a is arranged outside the rotor shaft 4a on the outer circumference. In the radial direction R, an elastic element 12 in the form of a sleeve-shaped elastomeric spring 16 is arranged between the rotor shaft 4a and the transmission input gear 8a. The elastic element 12 is vulcanized and connected at this point. Through the elastic element 12, the rotor shaft 4a and the transmission input gear 8a are vibrationally decoupled, where the rotor shaft 4a and the transmission input gear 8a are connected only by an elastic element 10.

[0049] The elastic elements 10, 12 are arranged first between the rotor body 6a and the rotor shaft 4a, and second between the transmission input gear 8a and the rotor shaft 4a, which makes the rotor shaft 4a a "freely suspended torsional element". It can also be seen that the three structural elements 4, 6, 8 are arranged directly in sequence along a vibration path.

[0050] The structural element 4, namely the rotor shaft 4a, carries an annular disk-shaped inertial mass 18. The inertial mass 18 is an independent component relative to the rotor shaft 4a and has no other function except for the function of additional mass. It can also be clearly seen that the inertial mass 18 is arranged along the vibration path between the two elastic elements 10, 12 and is located on the structural element 4, namely the rotor shaft 4a, supported by the bearing 26.

[0051] In Figure 2 a cross-sectional view of the structural element 4 as the rotor shaft 4a and the structural element 6 as the rotor body 6a is depicted, and an elastic element 10 in the form of an elastomeric spring 14, preferably vulcanized and connected, is arranged radially between them. The elastic element 10 has a toothed profile running in the circumferential direction U, and this toothed profile forms a form-fit with the corresponding toothed profiles of the structural elements 4, 6. The outer circumferential toothed profile 10c and the inner circumferential toothed profile 10d of the elastic element 10 form the toothed profile of the elastic element 10 in the circumferential direction. The two toothed profiles 10c, 10d on both sides of the elastic element mesh with the corresponding toothed profiles 4d, 6d of the adjacent structural elements 4, 6. It can also be clearly seen that the teeth of the toothed profile 4d of the structural element 4 are also partially embedded in the toothed profile 6d of the structural element 6, thus forming an overlap in the circumferential direction U.

[0052] Figure 3Shows a cross-sectional view of a part of the elastic element 10 that is the elastomeric spring 14. The maximum radial thickness D of the elastic element 10 is 4 millimeters. A cylindrical tapered cavity 20 extends longitudinally through the elastic element 10, where the tapered cavity 20 is completely surrounded by the material of the elastic element 10 on the circumferential side. When two adjacent structural elements ( Figure 3 not shown in the figure) are twisted by a certain torsional angle about the central longitudinal axis Z, a force F acts on the elastic element 10, and the tapered cavity 20 closes or becomes smaller.

[0053] In Figure 4 a longitudinal sectional view of a part of the elastic element 10 that is the elastomeric spring 14 is depicted. The elastic element 10 includes a separating element 22, which is formed as a separating sleeve. The separating element 22 is vulcanized and embedded in the elastic element 10 and divides the elastic element 10 into two elastic element segments 10a, 10b of the same thickness. Thus, it can also be clearly seen that the sum of the respective radial thicknesses of the two elastic element segments 10a, 10b can be at most 4 millimeters, i.e., corresponding to the radial thickness D.

[0054] In Figure 5 a cross-sectional view shows another arrangement of the elastic elements 10, 12, where the general features of this figure are indicated by reference numerals. There, the elastic element 10 or the elastic element 12 is no longer arranged between two separate components, but inside a single component, for example, inside the structural element 4 that is the rotor shaft 4a, so it is divided into a rotor shaft segment 4b on the outer circumference and a rotor shaft segment 4c on the inner circumference. Similarly, the structural element 6 that is the rotor base 6a can also be divided into a rotor base segment 6b on the outer circumference and a rotor base segment 6c on the inner circumference. This also applies to the structural element 8 that is the transmission input gear 8a, so it can be divided into a transmission input gear segment 8b on the outer circumference and a transmission input gear segment 8c on the inner circumference.

[0055] Figure 6 Shows a cross-sectional view of the structural element 4 that is the rotor shaft 4a and the structural element 6 that is the rotor base 6a, between which the elastic element 10 that is the elastomeric spring 14 is radially arranged, and the elastic element has a separating element 22 formed as a separating sleeve. Here, the elastic element 10 has no material connection with the adjacent structural elements 4, 6.

[0056] The elastic element 10 has a plurality (exemplarily twelve here) of corrugations 36 that project in the radial direction R and extend in the longitudinal direction L. More precisely, the elastic element 10 includes a plurality (exemplarily six here) of outer corrugations 36a that project radially outwards and a plurality (exemplarily six here) of inner corrugations 36b that project radially inwards. The outer corrugations 36a and the inner corrugations 36b are arranged equidistantly from each other in the circumferential direction U. The outer corrugations 36a and the inner corrugations 36b are arranged in a staggered manner in the radial direction R and are offset from each other by a staggering angle W1 with respect to the central longitudinal axis.

[0057] The separating element 22 forms the corrugations 36, namely the outer corrugations 36a and the inner corrugations 36b, by increasing the material thickness, such that the separating element 22 has a greater radial material thickness in the region B1 where the corrugations 36 (i.e., the outer corrugations 36a and the inner corrugations 36b) are located than in the region B2 where there are no corrugations 36 (i.e., the outer corrugations 36a and the inner corrugations 36b). On the circumferential side, the separating element 22 is provided with elastic element segments 10a, 10b that have the same radial thickness in the longitudinal direction L and the circumferential direction U.

[0058] The structural element 6, which is the rotor substrate 6a, now has corrugation recesses 38a corresponding to the outer corrugations 36a. Each outer corrugation 36a is inserted into the corresponding corrugation recess 38a, and two air gaps 44 are arranged between one of the outer corrugations 36a and the corresponding corrugation recess 38a in the circumferential direction U. Thus, one air gap 44 is arranged on each side of the outer corrugation 36a in the circumferential direction U.

[0059] The structural element 4, which is the rotor shaft 4a, now also has corrugation recesses 38b corresponding to the inner corrugations 36b. Each inner corrugation 36b is inserted into the corresponding corrugation recess 38b, and two air gaps 44 are arranged between one of the inner corrugations 36b and the corresponding corrugation recess 38b in the circumferential direction U. Thus, one air gap 44 is also arranged on each side of the inner corrugation 36b in the circumferential direction U.

[0060] Obviously, the corrugation recesses 38a, 38b each form a curved track 40a, 40b along which the corrugations 36 (i.e., the outer corrugations 36a and the inner corrugations 36b) can slide when relative movement occurs between the structural elements 4, 6 in the circumferential direction U. When relative movement occurs, the radially outward curved track 40a causes the elastic element 10 to be acted upon by a force directed inwards towards the central longitudinal axis Z in the radial direction R, and when relative movement occurs, the radially inward curved track 40b causes the elastic element 10 to be acted upon by a force directed outwards away from the central longitudinal axis Z in the radial direction R.

[0061] Furthermore, it is also obvious that the corrugated recesses 38a, 38b each form a tapered slope 42a, 42b, along which the corrugations 36 (i.e., the outer corrugation 36a and the inner corrugation 36b) can slide when relative movement occurs between the structural elements 4, 6 in the circumferential direction U. When relative movement occurs, the radially outward tapered slope 42a causes the elastic element 10 to be acted upon by a force directed inward in the radial direction R towards the central longitudinal axis Z, and when relative movement occurs, the radially inward tapered slope 42b causes the elastic element 10 to be acted upon by a force directed outward in the radial direction R away from the central longitudinal axis Z. The tapered slopes 42a, 42b each have a flat orientation and are inclined relative to the radial direction R, so an inclination angle W2 is formed between them.

[0062] In this embodiment, the curved tracks 40a, 40b and the tapered slopes 42a, 42b correspond to the respective corrugated recesses 38a, 38b. Thus, in the circumferential direction U, a curved track 40a, 40b is arranged on one side of each corrugation 36 (i.e., the outer corrugation 36a and the inner corrugation 36b), and a tapered slope 42a, 42b is arranged on the other side.

[0063] The radially outward curved tracks 40a each have a tendency to become flatter towards the outer circumferential surface of the elastic element 10. The radially inward curved tracks 40b each also have a tendency to become flatter towards the inner circumferential surface of the elastic element 10. Advantageously, the radially outward curved tracks 40a and the radially inward curved tracks 40b become flatter in opposite directions in the circumferential direction U, thereby achieving opposite orientations of the curved tracks 40a, 40b in the circumferential direction U.

[0064] Figure 7 A cross-sectional view of the structural element 4 as the rotor shaft 4a and the structural element 6 as the rotor base 6a is shown, between which the elastic element 10 as the elastomeric spring 14 is arranged radially, and the elastic element has a separating element 22 as a separating sleeve. Since Figure 7 the motor rotor device 2 in Figure 6 is similar to that in Figure 7 for the sake of avoiding repetition, only the differences from Figure 6 will be described. The features not described should be regarded as having been disclosed and described.

[0065] The separating element 22 forms the corrugations 36 (i.e., the outer corrugation 36a and the inner corrugation 36b) through the corresponding circumferential profiles. Thus, the separating element 22 has the same radial material thickness in the region B1 where the corrugations 36 (i.e., the outer corrugation 36a and the inner corrugation 36b) are located and in the region B2 where there are no corrugations 36 (i.e., the outer corrugation 36a and the inner corrugation 36b). The circumferential profiles can be manufactured, for example, by shaping the separating element 22.

[0066] The corrugated recesses 38a, 38b no longer have the curved trajectories 40a, 40b. Instead, each corrugated recess 38a, 38b has two tapered slopes 42a, 42b such that a tapered slope 42a, 42b is formed on each side of the circumferential direction U of the corresponding corrugation 36 (i.e., the outer corrugation 36a and the inner corrugation 36b). The tapered slopes 42a, 42b of one corrugated recess 38a, 38b may have the same inclination angle W2, and preferably, all the tapered slopes 42a, 42b of the corrugated recesses 38a, 38b have the same inclination angle W2.

[0067] Figure 8 The effect of the motor rotor device 2 according to the present invention relative to a known rigid rotor is shown. In this graph, the relationship between the amplitude of torsional vibration (in radians, vertical axis Y) and the frequency (in hertz, horizontal axis X) is plotted. A rotor known in the prior art is excited by an excitation frequency, which is referred to as the rotor excitation G1. A vibration response, which is referred to as the vibration response G2 of the inelastic element, is measured on the housing of the known rotor. The motor rotor device 2 according to the present invention is also excited by this rotor excitation G1. A vibration response, which is referred to as the vibration response G3 of the elastic element, is measured on the housing of the motor rotor device.

[0068] It can be seen that the motor rotor device 2 according to the present invention results in a lower, sometimes significantly lower, vibration response over the entire measured frequency range, especially in the higher frequency range.

[0069] The present invention is not limited to any of the above embodiments and can be modified in various ways. All features and advantages derived from the claims, the description, and the drawings, including structural details, spatial arrangements, and method steps, can exist either individually or in various combinations, and are essential for the present invention.

[0070] Within the scope of the present invention, all combinations including at least two features from the features disclosed in the description, the claims, and / or the drawings are included.

[0071] To avoid repetition, the features disclosed in relation to the device should also be regarded as disclosed in relation to the method and can be claimed. Similarly, the features disclosed in relation to the method should also be regarded as disclosed in relation to the device and can be claimed.

[0072] List of reference numerals

[0073] 2 Motor rotor device

[0074] 4 Structural element

[0075] 4a Rotor shaft

[0076] 4b Rotor shaft section

[0077] 4c Rotor shaft section

[0078] 4d Tooth profile

[0079] 6 Structural element

[0080] 6a Rotor base

[0081] 6b Rotor base section

[0082] 6c Rotor base section

[0083] 6d Tooth profile

[0084] 8 Structural element

[0085] 8a Transmission input gear

[0086] 8b Transmission input gear section

[0087] 8c Transmission input gear section

[0088] 10 Elastic element

[0089] 10a Elastic element section

[0090] 10b Elastic element section

[0091] 10c Tooth profile

[0092] 10d Tooth profile

[0093] 12 Elastic element

[0094] 14 Elastomeric spring

[0095] 16 Elastomeric spring

[0096] 18 Inertial mass block

[0097] 20 Gradual cavity

[0098] 22 Separation element

[0099] 24 Stator

[0100] 26 Bearing

[0101] 28 Drive shaft

[0102] 30 Transmission

[0103] 31 Motor

[0104] 32 Motor housing

[0105] 34 Transmission housing

[0106] 36 Corrugation

[0107] 36a Outer corrugation

[0108] 36b Inner corrugation

[0109] 38a Corrugation recess

[0110] 38b Corrugation recess

[0111] 40a Curved trajectory

[0112] 40b Curved trajectory

[0113] 42a Gradual inclined plane

[0114] 42b Gradual inclined plane

[0115] 44 Air gap

[0116] 48 Flywheel

[0117] Area B1

[0118] Area B2

[0119] D Radial thickness

[0120] F Force

[0121] G1 Rotor excitation

[0122] G2 Vibration response without elastic element

[0123] G3 Vibration response with elastic element

[0124] L Longitudinal direction

[0125] R Radial direction

[0126] U Circumferential direction

[0127] W1 Misalignment angle

[0128] W2 Tilt angle

[0129] Z Central longitudinal axis

Claims

1. A motor rotor device (2), comprising: At least two structural elements (4, 6, 8) passing through the central longitudinal axis (Z) of the motor rotor device (2) and arranged coaxially with the central longitudinal axis (Z), characterized in that at least one elastic element (10, 12) is provided, and the elastic element is arranged in the radial direction (R) between the at least two structural elements (4, 6, 8) and connects the corresponding structural elements (4, 6, 8) to be relatively movable with respect to each other.

2. The motor rotor device (2) according to claim 1, characterized in that The elastic elements (10, 12) are elastomeric springs (14, 16), preferably made of magneto-active elastomers.

3. The motor rotor device (2) according to any one of the preceding claims, characterized in that Inertia mass blocks (18) are arranged on the structural elements (4, 6, 8) on the side of the elastic elements (10, 12) facing the central longitudinal axis (Z).

4. The motor rotor device (2) according to any one of the preceding claims, characterized in that The elastic element (10, 12) forms a form-fit with at least one of the at least two structural elements (4, 6, 8).

5. The motor rotor device (2) according to any one of the preceding claims, characterized in that The elastic element (10, 12) includes at least one tapered cavity (20).

6. The motor rotor device (2) according to any one of the preceding claims, characterized in that The elastic element (10, 12) includes a separating element (22), and the separating element separates the elastic element (10, 12) into two radially adjacent elastic element segments (10a, 10b).

7. The motor rotor device (2) according to claim 6, characterized in that The elastic element (10, 12) has at least one corrugation (36) protruding in the radial direction (R) and extending in the longitudinal direction (L). Preferably, the elastic element (10, 12) has an outer corrugation (36a) protruding radially outward and extending in the longitudinal direction (L) and / or an inner corrugation (36b) protruding radially inward and extending in the longitudinal direction (L), and at least one of the at least two structural elements (4, 6, 8) has a corrugation recess (38a, 38b) corresponding to the corrugation (36), the outer corrugation (36a) or the inner corrugation (36b), and at least one corrugation (36), outer corrugation (36a) or inner corrugation (36b) is embedded in the corrugation recess, preferably having a radially outward corrugation recess (38a) and / or a radially inward corrugation recess (38b).

8. The motor rotor device (2) according to claim 7, characterized in that At least one corrugated recess (38a, 38b) forms a curved track (40a, 40b) and / or a tapered slope (42a, 42b), such that when relative movement occurs in the circumferential direction (U) between the structural element (4, 6, 8) having the corresponding corrugated recess (38a, 38b) among the structural elements (4, 6, 8) and the elastic element (10, 12), the corrugation (36), the outer corrugation (36a) or the inner corrugation (36b) can slide along the curved track and / or the tapered slope, and is thus subjected to a radially inward or radially outward force.

9. The motor rotor device (2) according to claims 7 and 8, characterized in that an air gap (44) is arranged in the circumferential direction (U) between the corrugation (36), the outer corrugation (36a) or the inner corrugation (36b) and the corresponding corrugated recess (38a, 38b).

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