WO2012104032A2

WO2012104032A2 - Hydrodynamic component

Info

Publication number: WO2012104032A2
Application number: PCT/EP2012/000324
Authority: WO
Inventors: Markus Schlosser; Thorsten Lührs; Achim Menne; Dieter Laukemann; Ravi Schade; Bruno Foehl; Jürgen KIBLER; Christian Ebert
Original assignee: Voith Patent Gmbh
Priority date: 2011-02-02
Filing date: 2012-01-25
Publication date: 2012-08-09
Also published as: US20140050565A1; KR20140052947A; DE102011010153A1; CN103534505A; DE102011010153B4; JP2014508923A; EP2671059A2; WO2012104032A3

Abstract

The invention relates to a hydrodynamic component comprising at least two elements which form a working chamber therebetween and which comprises a primary wheel and a secondary wheel. A working medium which can be introduced into the working chamber allows torque to be transmitted between said elements. At least one of the elements is arranged in a rotationally fixed manner on a shaft. The hydrodynamic component comprises a device for detecting a variable characterising at least directly the transmitted torque and/or the rotation of the shaft. According to the invention, the shaft is at least designed to have at least two sections which are at an axial distance from each other and which are made of a ferromagnetic material and is provided with a magnetic field which is rotationally stable with the respective section. Magnetic field sensors are arranged in areas corresponding to the at least two sections.

Description

Hydrodynamic component

The invention relates to a hydrodynamic component with the features defined in more detail in the preamble of claim 1.

A generic hydrodynamic component is described in the German patent DE 10 2005 052 105 B4. This patent is concerned with a hydrodynamic system which is designed with a device for detecting a torque or a variable characterizing this torque. The structure is comparatively complicated, since one of the two elements of the hydrodynamic system has to be supported against a stationary element and in the area of this support the forces required for the support are measured. For this purpose, a comparatively large design effort must be accepted and in particular a rotational movement of the supporting element must be possible, which causes a correspondingly great expense, for example, in a hydrodynamic retarder. In addition, the supporting element must at least in

certain operating situations in a non-rotating state, since only here the measurement is possible. This is for example at a

hydrodynamic converter or a hydrodynamic coupling according consuming or sometimes not possible.

The object of the present invention is to avoid these disadvantages and to provide a hydrodynamic component in which a device for detecting a torque to be transmitted and / or the speed characterizing size is simplified, and during operation with minimal design effort is possible.

CONFIRMATION COPY According to the invention this object is achieved by the features in the characterizing part of patent claim 1. The subclaims dependent thereon indicate particularly preferred embodiments of the solution according to the invention.

The solution of the aforementioned object is to form the shaft at least in at least two axially spaced sections each of a ferromagnetic material and provided with a rotationally fixed to the respective portion of the shaft formed magnetic field. Magnetic field sensors are then arranged in regions corresponding to the at least two sections, for example on a housing surrounding the shaft. This structure allows it via the physical effect of the magnetostriction or the most important part of the magnetostriction Joule effect

To detect changes in the magnetic fields in the respective sections.

In particular, a slight rotation of the magnetic field in the first section in the axial direction of the shaft relative to the magnetic field in the second section can be detected. From this rotation of the magnetic fields in the sections to each other can be at a known axial distance of the sections to each other and known material property and dimensions of the shaft to determine the torque in the shaft. A torque will namely twist the shaft accordingly. This twist can then be over a

Change of magnetic fields in the two sections at an angle

register against each other and evaluate as torque applied in the area of the shaft.

In addition, the measurement allows a determination of the rotational speed of the shaft whenever the rotationally fixed to one of the sections arranged magnetic field in the circumferential direction has a constant inhomogeneity. Such can, for example, by a change in material, a mechanical change of the material or a circumferentially encoded magnetic field, with which the shaft is provided can be achieved. As an alternative to the torque, the rotational speed of the shaft can thus also be detected.

Ideally, both the speed and the torque are detected in the shaft with a correspondingly high measuring frequency, so that speed and / or torque are quasi-continuously available. The measurement of

Torque is of particular interest for a hydrodynamic retarder or a hydrodynamic coupling as a hydrodynamic component, since the transmitted torque can be detected here with a corresponding sensor in one of the shafts. It is in principle also at one

hydrodynamic converter conceivable, in which case either the torque of both the input shaft and the output shaft must be detected due to the Abstützmoments of the vanes between the primary and the secondary, or in addition to the torque in one of the waves

Supporting moment of the vanes to determine the torque transmitted by the component.

The rotationally fixed to the respective portion of the shaft arranged magnetic fields can be constructed in principle in any manner, provided that they are rotationally fixed and constant at least during a certain period of time for measurement. In particular, the magnetic fields or at least one of the magnetic fields according to a particularly favorable and advantageous embodiment of the hydrodynamic component according to the invention may be formed as a permanent magnetic field. As a result, the shaft can be magnetized once, for example, prior to assembly, or the expense for the structures required to build up the magnetic field in the region of the shaft is eliminated. With a corresponding magnetization of the shaft,

For example, via a coded magnetic field and / or a magnetic field, which in the circumferential direction at least two magnetically different from each other Subsections should be exemplary of the international application

WO 2005/064302 A2 be pointed out.

In a particularly favorable and advantageous embodiment of

According to the invention hydrodynamic component may be provided that the magnetic field sensors are arranged without contact to the shaft. This allows the measurement of torque and / or speed without

Frictional losses occur.

According to a particularly favorable and advantageous embodiment of

According to the invention hydrodynamic component, it is further provided that the shaft is formed as a hollow shaft, wherein at least one of

Magnetic field sensors is arranged in the interior of the hollow shaft. This construction of a hollow shaft with fixed magnetic field sensors arranged in the interior of the rotating hollow shaft is very space-saving, since the sensors arranged in the interior of the hollow shaft need no further installation space in the region of a housing surrounding the shaft.

In a supplementary or alternative embodiment of the hydrodynamic component, it may be provided that at least one of the

Magnetic sensors is arranged in the region of a sealing element surrounding the shaft. Typically, in the case of a hydrodynamic component in the region of the shaft, at least one sealing element is necessary in order to seal the working fluid, which is in the working space between the elements, for example the primary wheel and the secondary wheel, during the torque transmission from the environment. Such a sealing element, which surrounds the shaft, is ideally suited to integrate the magnetic field sensor, which may be, for example, a coil surrounding the shaft in this sealing element and space neutral with suitable magnetizations of at least two axially spaced portions of the shaft and Arrangement of the magnetic field sensors in the region of the sealing element to the shaft to create a hydrodynamic component with corresponding inventive sensor.

In particular, at least one of the magnetic field sensors can be arranged in a shaft sealing ring surrounding the shaft. Such shaft seals typically have a configuration anyway, which allows sufficient space for the integration of a coil as a magnetic field sensor. you are

typically very accessible and with appropriate areas of the

Housing connected, so that a cable guide from the area of the integrated shaft seal in the coil, for example, to the outside of the

Housing for electronics or the like is simple and easy.

In a further preferred embodiment of the invention

hydrodynamic component, it may also be provided that at least one of the magnetic field sensors is arranged between two shaft sealing rings surrounding the shaft. In this area between two shaft seals surrounding the shaft of a multi-stage sealing of the shaft or the working space, the possibility arises one or both

To arrange magnetic field sensors between these shaft seals. This has the advantage that abrasion from the working space will not reach the extent in such an area and that contamination of the magnetic field sensors can thereby be largely avoided.

In a particularly favorable and advantageous embodiment of

According to the invention hydrodynamic component, it may be provided that a shaft seal has at least one shaft seal and a connected via a support member with the shaft seal ring piston ring. With this structure, at least one of the magnetic field sensors can then be arranged on the carrier element. This construction with an between working space and the first sealing chamber placed piston ring allows a reduction of the pressure in the first sealing chamber against the pressure in the working space, for example, about 20% of the pressure in the working space. The piston ring is often connected via a carrier element with a shaft sealing ring, which ensures the sealing of the first sealing space relative to the environment or possibly also with respect to a further second sealing space. Such a carrier is suitable, optionally extended in the axial direction, ideal to carry around the magnetic field sensor, since this is typically formed of a metal sleeve, which surrounds the shaft accordingly. With sufficient axial length of this support element, it is also very possible, the

Magnetic field sensors, corresponding to the two axially from each other

spaced portions of the shaft, both at a certain axial distance from each other to place on the support member, so as to easily and efficiently ensure a possibility for integration of the sensor.

In an advantageous development of the invention, it may be provided that the shaft is formed in the region of one of the sections at one or more points distributed around the circumference of the shaft so that a mechanical load on the shaft causes a voltage gradient. Due to the Joule effect, this results in a situation associated with the position of this position

Change of the magnetic field. If, in the region of one of the sections, there are one or more points distributed over the circumference which cause such a change in the magnetic field, then, without the magnetic fields having to be provided specifically for a rotational speed measurement, the possibility arises of measuring the rotational speed, since a characteristic change of the magnetic field caused by the location with the voltage gradient is detected once or several times per revolution, depending on the number of locations. From this it is very easy to derive a speed signal. In a very advantageous continuation of this idea, it may be provided that the bodies as relief or drain hole for a

Lubricants are formed from a region between two sealing elements of the shaft. Such relief holes, for example, in the area between two shaft seals or in the area between a

Piston ring and a shaft seal, so in a working space

be provided adjacent sealing region to remove lubricant under a lower pressure accordingly, for example, by a running inside the shaft central bore or the like. These relief holes cause a voltage gradient, so without additional

manufacturing complexity, and with the special side effect of having one or more relief wells already integrated, easy and efficient speed measurement can be achieved via the rotating in the respective section with the shaft, inhomogeneous over the circumference magnetic field.

The inventive design of the hydrodynamic component may be a converter or a hydrodynamic coupling. In particular, the component may also be a hydrodynamic retarder. This retarder can be correspondingly simple in construction, since, in contrast to constructions in the prior art, the stator can be formed directly integrated into the housing, since the torque can be detected in the shaft and for this no rotational movement of the stator about its axis is necessary. In addition, the simple and compact integration of the sensors,

For example, in the shaft seals or in the region of the sealing elements, with minimal effort and minimal space a sensor in the

Integrate appropriate retarder, which can be very simple, efficient and space-saving. It allows both the torque and the speed to be measured and thus to ensure all of the control of the retarder or to control the retarder as one of the braking options with comprehensive braking system. The sensors constructed on the principle of magnetostriction allow use under a wide variety of conditions, since the magnetic field sensors are correspondingly simple and can be made very resistant to temperatures, environmental influences and the like. You can

For example, be used in the field of lubricating oil or working fluid and can in particular under correspondingly high

Ambient temperatures can be operated safely and reliably.

Further advantageous embodiments of the hydrodynamic component of the invention will become apparent from the remaining dependent claims and will be apparent from the embodiments, which are explained below with reference to the figures.

Showing:

Figure 1 is a schematic representation of a hydrodynamic retarder;

FIG. 2 shows a design for measuring the torque and / or the rotational speed on the shaft of the retarder according to FIG. 1;

Figure 3 shows a first possible embodiment for the arrangement of

Magnetic field sensors;

Figure 4 shows a second possible embodiment for the arrangement of

Magnetic field sensors;

Figure 5 shows a third possible embodiment for the arrangement of

Magnetic field sensors; Figure 6 shows a fourth possible embodiment for the arrangement of

Magnetic field sensors; and

7 shows a diagram of the shear stress curve in the shaft according to FIG

6th

In the illustration of FIG. 1, a hydrodynamic component 1 in the form of a retarder 1, which is constructed very simply, can be seen in a schematic diagram. The hydrodynamic retarder 1 consists of a primary wheel 2, which is designed to be rotatable, and which is arranged rotationally fixed on a shaft 3. The primary wheel of the hydrodynamic retarder 1 is also referred to as a rotor. The rotor 2 now has a at its outer end

bladed area, which together with a corresponding bladed area in a secondary wheel 4 denoted by 5

forming a toroidal working space. The secondary wheel 4 is typically fixed in the structure of the retarder and is designed to be integrated into a housing 6 in the very simple exemplary embodiment illustrated here. The secondary wheel 4 is also referred to as stator 4. The working space 5 of the retarder 1 is always filled with a working medium, for example the cooling water of a cooling circuit in the case of a Wasserretarders or an oil as a working medium when it is to be braked wear-free with the retarder. The working space 5 is sealed over here in principle indicated sealing elements 7 relative to the environment, the shaft 3 is about indicated bearings 8, for example, bearings mounted accordingly.

The retarder 1 may for example be arranged in a commercial vehicle, a rail vehicle or the like. The rotor 2 moves the working medium located in the working space 5 with its bladed area and thus tries to transmit a corresponding torque to the stator 4. Since the stator 4 in turn is not rotatably formed, creates a corresponding Braking torque. The resulting power is converted into heat in the working medium. If the working medium is the cooling medium in the cooling circuit of a vehicle equipped with the retarder 1, the heat is transferred through the

Cooling medium discharged directly, if an oil is used as the working medium for the retarder 1, this is cooled by a heat exchanger of a cooling medium in a cycle of the vehicle.

Such a retarder 1 often forms part of a braking system and is combined with other brakes. This can be, for example, an engine brake, a friction brake and optionally a generator for recuperative braking. In order to be able to distribute the braking power ideally to the individual brakes, it is important that the force applied by the individual brakes

Braking torque is known. For this purpose, the braking torque, for here

illustrated embodiment in the region of the retarder 1, are measured accordingly. The retarder 1, which is indicated in principle in FIG. 1, should have a device for detecting the transmitted torque, which is indicated in principle in the illustration in FIG. This device consists essentially of two sections 9, 10 of the shaft 3, which have been provided with a permanent magnetic field. At least the two sections 9, 10, but in particular the entire shaft 3 can be made of a ferromagnetic material for this purpose. As shown in the prior art mentioned in the description, the sections 9, 10 can be provided with a permanent magnetic field which remains permanently in the area of the shaft 3 or in the area of the sections 9, 10 and thus only once before the assembly Wave 3 must be generated in the retarder 1. The magnetic field located in the two sections 9, 10 is rotationally fixed to the respective section 9, 10 of the shaft 3.

If it now, as indicated in the illustration of Fig. 2, to a load of the shaft 3 via a torque Mi, so forms by the rotationally fixed with the Shaft-connected rotor 2 and the above-described principle of action of the retarder 1 from a corresponding counter-torque, which is designated in the illustration of FIG. 2 with M2. Due to the torque and the counter-torque, there is a (slight) torsion of the shaft 3. From the axial distance I of the two sections 9, 10, the material properties and the geometry of the shaft 3 in this area and a twist angle of the first section 9 relative to the second section 10 can thus detect the torque in the shaft 3. The shaft 3 itself forms the primary sensor. To the sections 9, 10 of the shaft 3 are non-contact magnetic field sensors 11, 12 as

Secondary sensors arranged. These are designed in the form of coils which surround the shaft 3. They are connected via corresponding line elements 13 with a transmitter 14, which may be arranged outside the housing 6 of the retarder 1, for example. The magnetic field sensors 11, 12 can detect the magnetic field located in the region of the sections 9, 10. If there is an angular deviation between the two sections 9, 10, then those in the sections 9, 10 are also impressed in a rotationally fixed manner with the shaft

Magnetic fields rotated at an angle to each other. This angle of rotation can be detected by the magnetic field sensors 11, 12 and allows to draw conclusions about the torque with the geometric properties and the material property of the structure.

The device for detecting the torque uses the principle of magnetostriction or the Joule effect. The magnetic field sensors 11, 12 in the form of the coils surround the shaft 3 without contact, so that additional friction or the like arises as a result. In addition, they are relatively small and very robust, so that they can be used in lubricating oil, at high temperatures, and in the working medium of the retarder 1. Characterized in that the shaft itself or the magnetized portions 9, 10 of the shaft 3 as

Serving primary sensor, the structure is extremely compact, since only the magnetic field sensors 11, 12 require additional space. To this now Arranging comparatively space-saving in the retarder 1, it can be provided in particular to arrange them in the region of the sealing elements 7 or to integrate into these.

In the illustration of Fig. 3, a corresponding section with the shaft 3 and the housing 6 of the retarder 1 can be seen. Arranged around the shaft 3, but only above the shaft 3, two shaft sealing rings 15 are arranged, which seal the region of the environment to the left of the section shown with the working space 5 located on the right of the section shown. The shaft seals 15 are executed in a conventional manner. They additionally have the two magnetic field sensors 11, 12 in the form of coils. By integrating the magnetic field sensors 11, 12 in the shaft seals 15, a very compact design succeeds. Since the shaft seals 15 are present anyway, they must be minimally adapted in their design and can be easily retrofitted into existing structures, since the overall structure of shaft seal 15 and integrated

Magnetic field sensors 11, 12 can be designed so that in the

Outside dimensions corresponds to a conventional shaft seal 15. Since the primary sensor is impressed in the region of the shaft 3 only by magnetization, so there is virtually no additional effort in terms of space.

An analogous representation can be seen in FIG. 4. The two magnetic field sensors 11, 12 are in the embodiment shown here between two

Shaft seals 15 integrated in the space between the shaft seals 15 space. The existing space in conventional constructions anyway space can be used in particular for the integration of the magnetic field sensors 11, 12, since relatively controlled and uniform conditions prevail and since there are moderate pressures and relatively little abrasion from the area of the working space 5 in this area. The magnetic field sensors can thus be at a very constant over a long period of time Working conditions, so that the reliability of the structure can be increased. This also applies to the structure shown in Fig. 3.

In the illustration in Fig. 5, an alternative embodiment can be seen. The shaft 3 is designed here as a hollow shaft, which has a through hole or blind hole 16 in its interior. Since the magnetization of the sections 9, 10 acts not only outside, but also inside a hollow shaft, it is possible to arrange the magnetic field sensors 11, 12 not only around the shaft 3 but also inside the shaft 3. These are connected via a corresponding carrier 17 fixedly connected to a non-rotating part, such as the housing 6. You can then measure analogous to the embodiments described above. They are safely and reliably protected due to the integration into the wave of events occurring from the outside of the shaft 3. About the carrier 17, the line elements 13 can be easily outward.

In the illustration of FIG. 6, a further embodiment of the construction analogous to that shown in FIGS. 3 and 4 is shown. In this structure, only one shaft seal 15 is shown. This is connected via a support member 18 with a piston ring 19 and carries it. The carrier element 18 can surround the shaft 3 as a ring-shaped sheet metal element. The piston ring 19 cooperates with a corresponding groove 20 in the shaft 3 and seals the

Working space 5 opposite to the between the piston ring 19 and the

Shaft seal 15 located first sealing region 1 from. In the area of

Working space can typically be pressures of the order of, for example, 10 bar. In the first sealing region 21 between the piston ring 19 and the shaft seal 15 then typically a pressure in the order of 1.5 to 2.5 bar will adjust. The support member 18 is also known and customary in conventional constructions. It has a comparatively small axial length. In that shown in Fig. 6 Embodiment, this axial length of the support member 18th

increased accordingly, so as to increase the first sealing area 21 and to create space for the magnetic field sensors 11, 12, which with the

Carrier element 18 are connected. Thus, a structural integration of the magnetic field sensors 11, 12 can be achieved, in which only a minimal adjustment of the structure is necessary. In order to be able to realize a good sealing of the retarder 1 with respect to the environment, optionally a further shaft sealing ring 15 may be provided so as to form a second sealing space on the side facing away from the first sealing chamber 21 side of the shaft seal ring 15 shown here. In addition, the first sealing space 21 via a

Relief bore 22 connected to a bore 16 in the region of the shaft 13 designed as a hollow shaft. Oil can flow out of the second sealing space via this relief bore 22 and thus decisively improve the sealing of the retarder 1.

In addition to the torque which is measured via the magnetic field sensors 11, 12 and the magnetized sections 9, 10 of the shaft 3, the torque detection device also provides the possibility of detecting the rotational speed of the shaft 3 in addition to or alternatively to the torque , In this case, for example, the magnetic field can be formed such that it has magnetically differently acting partial regions around the circumference of the shaft 3, so that a corresponding region can be detected via the magnetic field sensors 11, 12 and associated with a rotation of the shaft.

In particular, however, such inhomogeneity of the magnetic field around the circumference of the shaft 3 also results when in the region of the shaft 3 a

corresponding point is arranged, which ensures a voltage gradient in the voltage occurring during the mechanical loading of the shaft. Such a location may be, for example, an axially extending groove, step or the like. In particular, the relief hole 22 or a plurality of arranged over the circumference of the shaft 3 relief holes 22 are used accordingly. In the illustration of FIG. 7, the shear stress in the region of the shaft 3 can be seen in a diagram via its axial extent. The dashed line shows the shear stress in the areas where no relief hole 22 is arranged. The solid line shows the shear stress in the region in which the relief hole 22 is arranged. This strongly deviating shear stress ensures according to the Joule effect for a change in the magnetic field of the associated

Section, in this case the associated second portion 10, so that in this section at the locations of the circumference at which the relief hole 22 is arranged, a corresponding change of the magnetic field occurs. If, for example, a relief bore 22 is arranged around the circumference, then the corresponding disturbance in the shear stress and thus in the

Magnetic field always detected when this position is in a certain position. Each revolution of the shaft, this event can thus capture once, creating a simple and efficient speed sensor, which uses the already existing conditions, in this case the relief hole 22 of the sealing system accordingly, to simple, efficient and reliable without additional manufacturing or assembly costs the torque and the speed of the shaft 3 can detect.

Claims

claims

1. Hydrodynamic component (1)

1.1 with at least two a working space (5) between them forming elements (2, 4), which comprise a primary wheel (2) and a secondary wheel (4), and which can be introduced via a in the working space

Working medium transmits a torque between the elements (2, 4),

1.2 at least one of the elements (2, 4) is rotatably mounted on a shaft (3),

1.3 with a device for detecting a transmitted torque and / or the rotational speed of the shaft (3) at least indirectly

characterizing size,

characterized in that

1.4, the shaft (3) at least in at least two axially from each other

each spaced portions (9, 10) consists of a ferromagnetic material and with a rotationally fixed to the respective section (9, 10) formed magnetic field is provided, and that

1.5 in with the at least two sections (9, 10) corresponding

Areas magnetic field sensors (11, 12) are arranged.

2. Hydrodynamic component (1) according to claim 1, characterized

in that at least one of the sections (9, 10) is provided with a permanent magnetic field.

3. Hydrodynamic component (1) according to claim 1 or 2, characterized in that the magnetic field of at least one portion (9, 10) is formed as a coded magnetic field.

4. hydrodynamic component (1) according to claim 1, 2 or 3, characterized in that the magnetic field of at least one portion (9, 10) in the circumferential direction at least two magnetically from each other

has distinctive subareas.

5. Hydrodynamic component (1) according to one of claims 1 to 4, characterized in that the magnetic field sensors (11, 12)

contactless to the shaft (3) are formed.

6. Hydrodynamic component (1) according to one of claims 1 to 5, characterized in that the magnetic field sensors (11, 12) are designed in the form of coils.

7. Hydrodynamic component (1) according to one of claims 1 to 6, characterized in that the magnetic field sensors (11, 12) surround the shaft (3).

8. Hydrodynamic component (1) according to one of claims 1 to 6, characterized in that the shaft (3) is designed as a hollow shaft, wherein at least one of the magnetic field sensors (11, 12) is arranged in the interior of the hollow shaft.

9. hydrodynamic component (1) according to one of claims 1 to 8, characterized in that at least one of the magnetic field sensors (11, 12) in the region of a shaft (3) surrounding the sealing element (7, 15, 19) is arranged.

10. Hydrodynamic component (1) according to one of claims 1 to 9, characterized in that at least one of the magnetic field sensors (11, 12) in a shaft (3) surrounding shaft seal (15) is arranged.

11. Hydrodynamic component (1) according to one of claims 1 to 10, characterized in that at least one of the magnetic field sensors (11, 12) between two the shaft (3) surrounding the shaft sealing rings (15) is arranged.

12. Hydrodynamic component (1) according to one of claims 1 to 11, characterized in that at least one of the magnetic field sensors (11, 12) in the region of a holder (18) for a sealing element (19) is arranged.

13. Hydrodynamic component (1) according to one of claims 1 to 12, characterized in that a shaft seal has at least one shaft seal (15) and a via a carrier element (18) with the shaft seal (15) connected to the piston ring (19), wherein at least one of the magnetic field sensors (11, 12) is arranged on the carrier element (18).

14. Hydrodynamic component (1) according to one of claims 1 to 13, characterized in that the shaft (3) in the region of one of the sections (9, 10) at one or more around the circumference of the shaft (3) distributed location is formed is that a mechanical load on the shaft (3) causes a voltage gradient.

15. Hydrodynamic component (1) according to claim 14, characterized

characterized in that the points relief holes (22) for a

Lubricant from a region (21) between two sealing elements (15, 19).

16. Hydrodynamic component (1) according to claim 14, characterized

in that the locations have an edge or groove extending axially relative to the shaft (3).

17. Hydrodynamic component (1) according to one of the preceding

Claims characterized by their design as a hydrodynamic coupling or as a hydrodynamic retarder (1).

18. Hydrodynamic component (1) according to one of claims 1 to 16, characterized by its design as a hydrodynamic converter.