Abstract:
A rolling bearing ( 50 ) which includes a rolling bearing inner ring ( 51 ), a rolling bearing outer ring ( 52 ) and a rolling bearing ball cage ring ( 53 ). The aim of the invention is to enable a hydraulic pressure medium (P) to be transferred, economizing as much mounting space as possible, for example for a camshaft ( 10 ), the phase position thereof being adjustable in relation to a crankshaft via a hydraulic pressure medium (P) through a hydraulic phase adjusting device ( 20 ). The rolling bearing ( 50 ) includes at least one channel ( 51   a,    51   a′,    52   a′,    41, 42 ) for guiding hydraulic pressure medium (P). A camshaft assembly equipped with such a rolling bearing ( 50 ).

Description:
[0001]    The present invention relates to a rolling bearing and a camshaft assembly. 
       BACKGROUND INFORMATION 
       [0002]    Camshafts are used in valve train assemblies of internal combustion engines for the purpose of controlling the opening and/or closing of inlet valves and/or outlet valves in a targeted manner. The camshaft is driven by a crankshaft. 
         [0003]    Adjustment of the phase angle of the camshaft with respect to the crankshaft may take place with the aid of a hydraulic phase adjusting device which is placed, for example, in or on the camshaft and which is supplied with a hydraulic pressure medium such as motor oil, for example via the oil pump of the internal combustion engine. Pressure medium-conducting channels may be formed in the camshaft for the purpose of supplying the hydraulic phase adjusting device with the hydraulic pressure medium. 
         [0004]    Publication EP 2 326 804 B1 describes a camshaft assembly, in which a hydraulic phase adjusting device is supplied with pressure medium via a radial channel in the camshaft. 
       SUMMARY OF THE INVENTION 
       [0005]    It is an object of the present invention to provide a preferably installation space-saving option for transferring a hydraulic medium, for example for a camshaft whose phase angle with respect to a crankshaft is adjustable with the aid of a hydraulic pressure medium, using a hydraulic phase adjusting device. 
         [0006]    The present invention provides a rolling bearing which has a rolling bearing inner ring, a rolling bearing outer ring and a rolling bearing ball cage ring and which includes at least one channel for conducting a hydraulic pressure medium. Due to the at least one channel, a hydraulic pressure medium may be advantageously conducted in an installation space-saving manner. 
         [0007]    For example, the rolling bearing inner ring may be designed to be rotatable and the rolling bearing outer ring to be stationary, or the rolling bearing inner ring may be designed to be stationary and the rolling bearing outer ring to be rotatable. The rolling bearing ball cage ring may be designed to be both stationary and rotatable or to be loosely or floatingly supported. 
         [0008]    The rolling bearing may be used, for example, for the purpose of, in particular rotatable, support of a camshaft. The camshaft may be, in particular, a camshaft whose phase angle with respect to a crankshaft is adjustable with the aid of a hydraulic pressure medium, for example using a hydraulic phase adjusting device. The hydraulic phase adjusting device may be designed, for example, as a vane-type adjuster. For example, the hydraulic phase adjusting device may be situated at least partially within the camshaft or its interior and/or be supplied with the hydraulic pressure medium via the interior of the camshaft. For this purpose, the camshaft may include, for example, at least one radial channel. 
         [0009]    In particular, the rolling bearing may be designed to transfer a hydraulic pressure medium from a stationary component to a rotatable component. For example, a pressure medium channel formed in a stationary component, for example in a cylinder head-affixed component, may communicate with the phase adjusting device via the at least one channel of the rolling bearing. For example, the pressure medium channel may communicate with the phase adjusting device via the at least one channel of the rolling bearing and at least one radial channel of the camshaft and/or the interior of the camshaft. The pressure medium channel may also be, for example, a radial channel. 
         [0010]    A cylinder head-affixed component may be understood, in particular, to be a component which is immovably situated on the cylinder head. This component may be, for example, the cylinder head, a cylinder head cover, a crankcase, a chain case or an ancillary component connected to these components. 
         [0011]    Communicating may be understood to be a direct pressure medium transfer as well as an indirect pressure medium transfer, for example via one or multiple additional, for example interposed, openings, channels and/or components. 
         [0012]    Within the scope of one specific embodiment, the rolling bearing includes at least one pressure medium transfer element. The pressure medium transfer element may be, in particular, an independent component or an independent component arrangement. The pressure medium transfer element may be situated loosely or floatingly supported in the rolling bearing or fastened to a rolling bearing component, for example to the rolling bearing inner ring or to the rolling bearing outer ring or to the rolling bearing ball cage ring. The pressure medium transfer element may be, in particular, an annular component or an annular component arrangement. 
         [0013]    Within the scope of another specific embodiment, on the other hand, at least one rolling bearing component, in particular the rolling bearing inner ring and/or the rolling bearing outer ring and/or the rolling bearing ball cage ring, itself is used to transfer the hydraulic pressure medium. 
         [0014]    Within the scope of one preferred specific embodiment, at least one pressure medium transfer element and/or rolling bearing component, in particular the rolling bearing inner ring and/or the rolling bearing outer ring and/or the rolling bearing ball cage ring, includes at least one annular channel for the purpose of transferring the hydraulic pressure medium, in particular, between a stationary component and a rotatable component. 
         [0015]    In particular, the at least one annular channel of the pressure medium transfer element or the rolling bearing component may have an annular channel opening extending in the circumferential direction of the annular channel and at least one radial channel opening opposite the annular channel opening and emptying into a radial channel. 
         [0016]    A pressure medium transfer between a stationary component and a rotatable component may advantageously take place in a simple, reliable and installation space-saving manner via the annular channel opening and the at least one radial channel opening of the at least one annular channel of the pressure medium transfer element or the rolling bearing component. In particular, at least one pressure medium channel in a stationary component, for example a cylinder head-affixed component, may communicate with at least one channel in the rotatable component, for example the camshaft, via the annular channel opening and radial channel opening(s) of the annular channel of the pressure medium transfer element. 
         [0017]    Within the scope of another preferred specific embodiment, at least one pressure medium transfer element and/or rolling bearing component, in particular the rolling bearing inner ring and/or the rolling bearing outer ring and/or the rolling bearing ball cage ring, includes at least one radial channel which empties into a radial channel opening of the at least one annular channel of the pressure medium transfer element or the rolling bearing component. 
         [0018]    The at least one pressure medium transfer element and/or rolling bearing component may include both one annular channel and two or more annular channels. It is also possible for two or possibly more radial channels to be provided. 
         [0019]    In particular, the rolling bearing may include two or more components, which each include at least one annular channel, in particular having an annular channel opening extending in the circumferential direction of the annular channel, and at least one radial channel opening opposite the annular channel opening and emptying into a radial channel, and, if necessary, at least one radial channel emptying into a radial channel opening of the annular channel. For example, the rolling bearing may include two pressure medium transfer elements of this type or one pressure medium transfer element of this type and one rolling bearing component of this type or two rolling bearing components of this type. For example, the rolling bearing inner ring and the rolling bearing outer ring or the rolling bearing ball cage ring and the rolling bearing inner ring and/or the rolling bearing outer ring may each be designed in this way. The pressure medium transfer among the components may take place via the annular channel openings and radial channel openings of the annular channels. In particular, annular channels of different components may empty into each other and have, for example, annular channel openings which are situated opposite each other, in particular directly adjacent to each other. 
         [0020]    In principle, it is possible to fasten the pressure medium transfer element or the rolling bearing component in an angle-oriented manner. To dispense with an angle-oriented mounting, it may, however, be advantageous to provide one or multiple additional (mounting) annular channels and/or one or multiple additional (mounting) radial channels, for example having radial channel openings which are enlarged axially and/or in the circumferential direction. Due to the additional (mounting) annular channels and/or (mounting) radial channels, mounting tolerances may be advantageously compensated for and the mounting simplified thereby. 
         [0021]    For example, the at least one radial channel of the pressure medium transfer element or the rolling bearing component may empty into another (mounting) annular channel and/or another (mounting) radial channel having enlarged radial channel openings, for example which has an opening provided in an outer surface of the component. The additional (mounting) annular channel or (mounting) radial channel may be formed in the pressure medium transfer element or rolling bearing component or in a component adjacent thereto and having a channel, for example the camshaft or a cylinder head-affixed component. 
         [0022]    At least one pressure medium transfer element and/or rolling bearing component, in particular the rolling bearing inner ring and/or the rolling bearing outer ring and/or the rolling bearing ball cage, preferably includes at least one annular channel having a radially outer annular channel opening and, in particular, at least one radially inner radial channel opening and/or at least one annular channel having a radially inner annular channel opening and, in particular, at least one radially outer radial channel opening. 
         [0023]    The terms outer and inner refer to the particular annular channel, the term radial also referring to the rotationally symmetrical axis of the particular annular channel or also to the rotation axis of the camshaft or the rolling bearing or possibly of the camshaft. 
         [0024]    Within the scope of another preferred specific embodiment, at least one pressure medium transfer element and/or rolling bearing component, in particular the rolling bearing inner ring and/or the rolling bearing outer ring and/or the rolling bearing ball cage ring, includes at least one annular channel having a radially outer annular channel opening. In particular, the annular channel may have at least one radially inner radial channel opening. 
         [0025]    Within the scope of one special embodiment, at least one pressure medium transfer element and/or rolling bearing component, in particular the rolling bearing inner ring and/or the rolling bearing outer ring and/or the rolling bearing ball cage, includes at least one annular channel having a radially outer annular channel opening and, in particular, at least one radially inner radial channel opening, an annular channel having a radially inner annular channel opening and, in particular at least one radially outer radial channel opening as well as at least one radial channel which connects the annular channel having the radially outer annular channel opening to the annular channel having the radially inner annular channel opening. The at least one radial channel may empty, in particular, into the at least one radial inner radial channel opening of the annular channel having the radially outer annular channel opening and into the at least one radially outer radial channel opening of the annular channel having the radially inner annular channel opening. The annular channel having the radially outer annular channel opening and, in particular, the at least one radially inner radial channel opening may be, for example, an annular channel which is formed with the radially inner annular channel opening and the at least one radially outer radial channel opening radially outward from the annular channel, it being possible to refer to the annular channel having the radially outer annular channel opening as the outer annular channel and the annular channel having the radially inner annular channel opening as the inner annular channel. 
         [0026]    This embodiment has the advantage, on the one hand, that it may be situated, loosely or floatingly supported, for example between the stationary component and the rotatable component, for example between the rolling bearing inner ring and the rolling bearing outer ring or between a rolling bearing component and the cylinder head-affixed component or the camshaft or between the cylinder head-affixed component and the camshaft, it being possible to both facilitate a pressure medium transfer between a stationary component and a rotating component and to dispense with an angle-oriented alignment, due to the two annular channels. 
         [0027]    On the other hand, if this embodiment is fixedly connected to a component or integrated therein, this has proven to be advantageous, since it facilitates a pressure medium transfer between a stationary component and a rotating component via the one annular channel and may be fastened via the surface having the other annular channel, without taking into account an angle-oriented alignment, whereby the mounting may be advantageously simplified. 
         [0028]    The rolling bearing may include a component of this type, for example a pressure medium transfer element of this type or a rolling bearing component of this type, for example a rolling bearing inner ring or rolling bearing outer ring or rolling bearing ball cage ring of this type. A pressure medium transfer element of this type may be situatable or situated, for example, between the rolling bearing inner ring and the rolling bearing outer ring, or between the rolling bearing inner ring or the rolling bearing outer ring and the cylinder head-affixed component, or between the rolling bearing outer ring or the rolling bearing inner ring and the camshaft. A rolling bearing inner ring of this type may be situatable or situated, for example, between the camshaft and the rolling bearing ball cage ring or the rolling bearing outer ring or the cylinder head-affixed component. A rolling bearing outer ring of this type may be situatable or situated, for example, between the cylinder head-affixed component and the rolling bearing ball cage ring or the rolling bearing inner ring or the camshaft. A rolling bearing ball cage ring of this type may be situatable or situated, for example, between the rolling bearing inner ring or the camshaft and the rolling bearing outer ring or the cylinder head-affixed component. The pressure medium transfer element or rolling bearing component may be loosely or floatingly supported or fastenable or fastened to a rotatable or stationary component. For example, one of the annular channels of the pressure medium transfer element or rolling bearing component may communicate with a channel of a stationary or rotatable, in particular stationary, component, for example a pressure medium channel of a cylinder head-affixed component, or empty therein, in particular radially, for example directly or indirectly, via an annular channel opening, for example, the annular channel opening being situated opposite, in particular directly adjacent to, an opening of the channel of the component. The other annular channel of the pressure medium transfer element or rolling bearing component may communicate with a channel of a rotatable or stationary, in particular rotatable, component, for example one or multiple radial channels of the camshaft, or empty therein, in particular radially, for example directly or indirectly, via an annular channel opening, for example, the annular channel opening being situated opposite, in particular directly adjacent to, an opening of the channel of the component. 
         [0029]    It is furthermore possible that the rolling bearing has two or more components of this type. For example, the rolling bearing may include two pressure medium transfer elements of this type or one pressure medium transfer element of this type and one rolling bearing component of this type or two rolling bearing components of this type. For example, the rolling bearing inner ring and the rolling bearing outer ring or the rolling bearing ball cage ring and the rolling bearing inner ring and/or the rolling bearing outer ring may each be designed in this way. Or the rolling bearing includes a pressure medium transfer element of this type and a rolling bearing inner ring or rolling bearing outer ring or rolling bearing ball cage ring of this type. For example, one of the components may be rotatable, for example fastenable to the camshaft, or fastened to the rotatable rolling bearing ring, or it may be the rotatable rolling bearing ring itself, or it may be loosely or floatingly supported, for example fastened to the rolling bearing ball cage ring, in particular to an axial surface of the rolling bearing ball cage ring, or it may be the rolling bearing ball cage ring itself or it may be situated adjacent to the rolling bearing ball cage ring. The other component may be stationary, for example, fastenable to the cylinder head-affixed component, or fastened to the stationary rolling bearing ring, or it may be the stationary rolling bearing ring itself, or it may be loosely or floatingly supported, for example fastened to the rolling bearing ball cage ring, in particular to an axial surface of the rolling bearing ball cage ring, or it may be the rolling bearing ball cage ring itself or it may be situated adjacent to the rolling bearing ball cage ring. An annular channel of the rotatably/floatingly supported component facilitates a pressure medium transfer to an annular channel of the stationary/floatingly supported component. For example, the radially inner annular channel opening of the annular channel of the one, for example stationary/floatingly supported, component may be situated opposite, in particular directly adjacent to, the radially outer annular channel opening of the annular channel of the other, for example rotatably/floatingly supported component. An angle-oriented mounting may be advantageously dispensed with, due to the surfaces in which the annular channel openings of the two other annular channels of the components are formed (see  FIG. 4 ). 
         [0030]    Within the scope of one particularly special embodiment, the rolling bearing inner ring includes an annular channel having a radially outer annular channel opening and, in particular, at least one radially inner radial channel opening, an annular channel having a radially inner annular channel opening and, in particular, at least one radially outer radial channel opening as well as at least one radial channel which connects the annular channel having the radially outer annular channel opening of the rolling bearing inner ring to the annular channel having the radially inner annular channel opening of the rolling bearing inner ring, in particular the least one radial channel of the rolling bearing inner ring emptying into the at least one radially inner radial channel opening of the annular channel having the radially outer annular channel opening of the rolling bearing inner ring and into the at least one radially outer radial channel opening of the annular channel having the radially inner annular channel opening of the rolling bearing inner ring. 
         [0031]    The rolling bearing outer ring also includes an annular channel having a radially outer annular channel opening and, in particular, at least one radially inner radial channel opening, an annular channel having a radially inner annular channel opening and, in particular, at least one radially outer radial channel opening as well as at least one radial channel which connects the annular channel having the radially outer annular channel opening of the rolling bearing outer ring to the annular channel having the radially inner annular channel opening of the rolling bearing outer ring, in particular the least one radial channel of the rolling bearing outer ring emptying into the at least one radially inner radial channel opening of the annular channel having the radially outer annular channel opening of the rolling bearing outer ring and into the at least one radially outer radial channel opening of the annular channel having the radially inner annular channel opening of the rolling bearing outer ring. 
         [0032]    The radially outer annular channel opening of the annular channel of the rolling bearing inner ring is situated opposite, in particular directly adjacent to, the radially inner annular channel opening of the annular channel of the rolling bearing outer ring. 
         [0033]    The annular channel having the radially inner annular channel opening of the rolling bearing inner ring may communicate with a channel of a rotatable or stationary, in particular rotatable, component, for example with at least one radial channel of the camshaft, or the annular channel having the radially outer annular channel opening of the rolling bearing outer ring may communicate with a channel of a stationary or rotatable, in particular stationary, component, for example with a pressure medium channel of a cylinder head-affixed component. In particular, the annular channel having the radially inner annular channel opening of the rolling bearing inner ring may empty, in particular radially, into a channel of a rotatable or stationary, in particular rotatable, component, for example into one or multiple radial channels of the camshaft, for example, the radially inner annular channel opening of the rolling bearing inner ring being situated opposite, in particular directly adjacent to, a radially outer opening of the channel of the component, for example one or multiple radially outer radial channel openings of the camshaft. The annular channel having the radially outer annular channel opening of the rolling bearing outer ring may empty, in particular radially, into a channel of a stationary or rotatable, in particular stationary, component, for example into the pressure medium channel of the cylinder head-affixed component, for example, the radially outer annular channel opening of the rolling bearing outer ring being situated opposite, in particular adjacent to, a radially inner opening of the channel of the component, for example a radially inner opening of the pressure medium channel of the cylinder head-affixed component. 
         [0034]    Within the scope of another special embodiment, a pressure medium transfer element or a rolling bearing ball cage ring is situated between the rolling bearing inner ring and the rolling bearing outer ring, which includes at least one annular channel, in particular having an annular channel opening extending in the circumferential direction of the annular channel, and at least one radial channel opening opposite the annular channel opening and emptying into a radial channel and at least one radial channel which empties into a radial channel opening of at least one annular channel of the pressure medium transfer element or the rolling bearing ball cage ring. The pressure medium transfer element may be situated, for example, loosely or floatingly supported, for example adjacent to the rolling bearing ball cage ring or fastened to the rolling bearing ball cage ring, in particular to an axial surface of the rolling bearing ball cage ring. If the pressure medium transfer element is fastened to the rolling bearing call cage ring, the pressure medium transfer element may be situated in a stationary or rotatably or loosely/floatingly supported manner as a function of the rolling bearing ball cage. 
         [0035]    In particular within the scope of this embodiment, the rolling bearing inner ring and the rolling bearing outer ring may (each) include a radial channel. The radial channel of the rolling bearing outer ring may communicate with the radial channel of the rolling bearing inner ring via the pressure medium transfer element or the rolling bearing ball cage ring, in particular via the at least one annular channel and radial channel of the pressure medium transfer element or the rolling bearing ball cage ring. 
         [0036]    On the other hand, the radial channel of the rolling bearing inner ring may communicate with a channel of a rotatable or stationary, in particular rotatable, component, for example with one or multiple radial channels of the camshaft, or the radial channel of the rolling bearing outer ring may communicate with a channel of a stationary or rotatable, in particular stationary, component, for example with a pressure medium channel of a cylinder head-affixed component. 
         [0037]    In particular, the radial channel of the rolling bearing inner ring may empty into a channel of a rotatable or stationary, in particular rotatable, component, for example into one or multiple radial channels of the camshaft, in particular radially, for example directly or indirectly, for example via another (mounting) annular channel and/or (mounting) radial channel having radial channel opening(s) which are enlarged, for example, in the circumferential direction and/or axially, for example, a channel opening of the rolling bearing inner ring being situated opposite, in particular directly adjacent to, an opening of the channel of the component, for example one or multiple radial channel openings of the camshaft. The radial channel of the rolling bearing outer ring may empty into a channel of a stationary or rotatable, in particular stationary, component, for example into the pressure medium channel of the cylinder head-affixed component, in particular radially, for example directly or indirectly, for example via another (mounting) annular channel and/or (mounting) radial channel having radial channel opening(s) which are enlarged, for example, axially and/or in the circumferential direction, for example, a channel opening of the rolling bearing outer ring being situated opposite, in particular directly adjacent to, an opening of the channel of the component, for example an opening of the pressure medium channel of the cylinder head-affixed component. The additional (mounting) annular channel and/or (mounting) radial channel may have, for example, an opening formed in an inner lateral surface of the rolling bearing inner ring or in an outer lateral surface of the rolling bearing outer ring. For example, the additional (mounting) annular channel and/or (mounting) radial channel may be formed in the rolling bearing inner ring radially inwardly of the radial channel of the rolling bearing inner ring or in the rolling bearing outer ring radially outwardly of the radial channel of the rolling bearing outer ring. 
         [0038]    The pressure medium transfer element or the pressure medium transfer elements may include an annular base body in the form of an annular U profile or H profile having an essentially axially oriented profile middle section, at least one radial channel extending through the profile middle section. The at least one radial channel may be designed, for example, in the form of a continuous material recess, for example a bore. Due to the profile middle section and two profile side sections connected thereto, one annular channel may be provided in the case of a U profile or two annular channels may be provided in the case of an H profile. This embodiment has the advantage, on the one hand, that the pressure medium transfer element may be easily manufactured. On the other hand, an annular base body designed in this way may simultaneously function as a compression seal, as explained in greater detail below. 
         [0039]    A U profile may be understood to be, in particular, a profile having an essentially U-shaped cross-sectional surface. An H profile may be understood to be, in particular, a profile having an essentially H-shaped cross-sectional surface. Essentially may be understood to mean, in particular, that, to the extent that the lateral sections of the cross-sectional surface have a similar, in particular radial, extension to each other, the intermediate profile middle section may have shape deviations and may be provided, for example, with a wavy design. A wavy design of the profile middle section has the advantage that a compression seal and/or another annular groove and/or seal receptacles may be provided thereby (see  FIGS. 5 through 7 ). 
         [0040]    However, the pressure medium transfer element or the pressure medium transfer elements may also include an annular base body, in which the at least one annular channel is provided in the form of an annular groove, at least one radial channel, which empties into the at least one annular groove-shaped annular channel, extending through the annular base body. The at least one radial channel may be designed, for example, in the form of a continuous material recess, for example a bore, which empties into the at least one annular groove-shaped annular channel. In particular, two annular channels in the form of annular grooves may be provided in the annular base body, at least one radial channel, which empties into the two annular groove-shaped annular channels, extending through the annular base body. 
         [0041]    The annular base body may be made of metal or plastic, in the case of a design as a profile as well as in the case of a design as a component having an annular groove. For example, the annular base body may be a formed part, a cast part or a turned part. For example, the annular base body may be a metal sheet, for example a sheet metal ring, or a metal or plastic cast part. 
         [0042]    For the purpose of sealing the pressure medium transfer system, the pressure medium transfer element or the rolling bearing component designed for pressure medium transfer may be equipped, for example, with sealing rings and/or be designed as compression seals and/or be provided with one or multiple clearance fits. 
         [0043]    A sealing of the pressure medium transfer system may take place within the rolling bearing, in particular with the aid of one or multiple clearance fits, in particular with the aid of at least one clearance fit between the rolling bearing inner ring and the rolling bearing outer ring. 
         [0044]    The pressure medium transfer element or the rolling bearing component designed for pressure medium transfer may be sealed against one or multiple adjacent components to be sealed with respect thereto, with the aid of one or multiple clearance fits. 
         [0045]    Alternatively or additionally, however, it is also possible that the pressure medium transfer element or the rolling bearing component designed for pressure medium transfer (each) includes at least two sealing rings, which extend, in particular essentially in parallel, to both sides of an annular channel. In particular, two sealing ring receptacles formed on both sides of an annular channel, for example in the form of annular indentations, may be provided for accommodating the sealing rings. 
         [0046]    If the pressure medium transfer element or the rolling bearing component designed for pressure medium transfer includes two annular channels and is fixedly connected to another component via a surface having an annular channel, or if it is integrated therein, it is possible to provide sealing rings or sealing ring receptacles only on the two sides of one of the annular channels, namely the annular channel formed in an unconnected surface. 
         [0047]    If the pressure medium transfer element or the rolling bearing body designed for pressure medium transfer has two annular channels and is a loosely or floatingly supported component or a loosely or floatingly supported component arrangement, it is possible to provide two sealing rings or sealing ring receptacles on both sides of both annular channels, i.e., a total of at least four sealing rings or sealing ring receptacles. 
         [0048]    Alternatively or additionally, however, it is also possible that the pressure medium transfer element or the rolling bearing component designed for pressure medium transfer itself functions as a compression seal, a section of the pressure medium transfer element or the rolling bearing component designed for pressure medium transfer being pressable against an adjacent component to be sealed with respect thereto for the purpose of achieving a sealing effect upon application of pressure medium and, if necessary, upon deformation. The component to be sealed, for example the cylinder head-affixed component, or the camshaft or the rotatable or stationary rolling bearing ring, may have a compression sealing contact and/or accommodating section, which, if necessary, is also used for the purpose of, in particular, radial and/or axial stabilization of the position of or blocking of the compression seal section of the pressure medium transfer element or of the rolling bearing component designed for pressure medium transfer. 
         [0049]    The present invention also provides a camshaft assembly which includes a camshaft, a hydraulic phase adjusting device for adjusting the phase angle of the camshaft with respect to a crankshaft with the aid of a hydraulic pressure medium, a pressure medium channel formed in a stationary component, in particular in a cylinder head-affixed component, as well as a rolling bearing according to the present invention. In particular, the pressure medium channel may communicate with the phase adjusting device via the at least one channel of the rolling bearing. 
         [0050]    The camshaft may be rotatably supported, in particular, by the rolling bearing. 
         [0051]    For example, the camshaft may include, for example, at least one radial channel. The pressure medium channel may communicate with the phase adjusting device, in particular, via the at least one channel of the rolling bearing as well as the at least one radial channel of the camshaft. 
         [0052]    A pressure medium transfer element of the rolling bearing or a rolling bearing component designed for pressure medium transfer may be connected, in particular rotatably fixedly, to the camshaft. With respect to the cylinder head-affixed component, the pressure medium transfer element of the rolling bearing or the rolling bearing component designed for pressure medium transfer may be rotatably supported. The pressure medium channel may empty into an annular channel of the pressure medium transfer element of the rolling bearing or of the rolling bearing component designed for pressure medium transfer via an annular channel opening, in particular radially, for example directly, or for example indirectly via another (mounting) radial channel and/or (mounting) annular channel. The at least one radial channel of the pressure medium transfer element of the rolling bearing or of the rolling bearing component designed for pressure medium transfer may empty into at least one radial channel of the camshaft, in particular radially, for example directly, or for example via another radial channel and/or annular channel. 
         [0053]    Additionally or alternatively, a pressure medium transfer element of the rolling bearing or a rolling bearing component designed for pressure medium transfer may be connected, in particular fixedly, to the stationary, in particular cylinder head-affixed, component. The pressure medium transfer element of the rolling bearing or the rolling bearing component designed for pressure medium transfer may be situated, in particular, in a stationary manner, with respect to the camshaft. The at least one radial channel of the camshaft may empty into an annular channel of the pressure medium transfer element of the rolling bearing or of the rolling bearing component designed for pressure medium transfer via an annular channel opening, in particular radially, for example directly, or for example indirectly via another (mounting) radial channel and/or (mounting) annular channel. The at least one radial channel of the pressure medium transfer element of the rolling bearing or of the rolling bearing component designed for pressure medium transfer may empty into a pressure medium channel of the stationary, in particular cylinder head-affixed, component, in particular radially, for example directly or, for example indirectly via another radial channel and/or annular channel. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0054]    The present invention is explained by way of example below on the basis of preferred exemplary embodiments with reference to the appended drawings, the features illustrated below being able to represent one aspect of the present invention both individually and in combination. 
           [0055]      FIG. 1  shows a schematic cross section of a first specific embodiment, which includes a pressure medium transfer element situated between the rolling bearing inner ring and the rolling bearing outer ring; 
           [0056]      FIG. 2  shows a schematic cross section of a second specific embodiment, which includes a rolling bearing cage ring designed for pressure medium transfer; 
           [0057]      FIG. 3  shows a schematic cross section of a third specific embodiment, which includes a rolling bearing inner ring designed for pressure medium transfer; 
           [0058]      FIG. 4  shows a schematic cross section of a fourth specific embodiment, in which both the rolling bearing inner ring and the rolling bearing outer ring are designed for pressure medium transfer; 
           [0059]      FIG. 5  shows a schematic cross section detail of a fifth specific embodiment, which includes a pressure medium transfer element having an annular base body fastened to the rolling bearing inner ring in the form of an annular U profile as well as having sealing rings; 
           [0060]      FIG. 6  shows a schematic cross section detail of a sixth specific embodiment, which includes a pressure medium transfer element having an annular base body fastened to the rolling bearing inner ring in the form of an annular U profile, which also functions as a compression seal; and 
           [0061]      FIG. 7  shows a schematic cross section detail of a seventh specific embodiment, which includes a pressure medium transfer element having an annular base body, loosely or floatingly supported, in the form of an annular U profile, which also functions as a compression seal. 
       
    
    
     DETAILED DESCRIPTION 
       [0062]      FIGS. 1 through 4  show camshaft assemblies which include a camshaft  10  and a hydraulic phase adjusting device  20  for adjusting the phase angle of camshaft  10  with respect to a crankshaft with the aid of a hydraulic pressure medium P. Camshaft  10  includes multiple radial channels  11 , which communicate with phase adjusting device  20  via interior  12  of camshaft  10 . At least one part of phase adjusting device  20  is situated inside camshaft  10 . Camshaft  10  has an essentially tube-shaped design. Interior  12  is delimited by phase adjusting device  20 , on the one hand, and by a closing element  13 , on the other hand. 
         [0063]    Camshaft  10  is rotatably supported around a rotation axis R with respect to a cylinder head-affixed component  30  via a rolling bearing  50 . At least one part of camshaft  10  projects into cylinder head-affixed component  30 . 
         [0064]    Cylinder head-affixed component  30  includes a pressure medium channel  31  in the form of a radial channel, which extends radially outward from radial channels  11  of camshaft  10 . 
         [0065]    Rolling bearing  50  includes a rolling bearing inner ring  51 , a rolling bearing outer ring  52  and a rolling bearing ball cage ring  53  situated therebetween, with rolling bearing balls  54  accommodated therein. Rolling bearing inner ring  51  is, in particular, rotatably fixedly fastened to an outer lateral surface of camshaft  10  via an inner lateral surface of rolling bearing inner ring  51 . Rolling bearing outer ring  52  is fastened to an inner lateral surface of cylinder head-affixed component  30  via an outer lateral surface of rolling bearing outer ring  52 . Camshaft  10  and rolling bearing inner ring  51  are rotatable components, and rolling bearing outer ring  52  and cylinder head-affixed component  30  are stationary components. Rolling bearing ball cage ring  53  may be loosely or floatingly supported and situated, for example, between rolling bearing inner ring  51  and rolling bearing outer ring  52 , secured only against an axial movement, and it may, if necessary, be rotatable together with a rotary motion of rolling bearing inner ring  51 . Alternatively, rolling bearing ball cage ring  53  may be fastened either to rolling bearing inner ring  51  or to rolling bearing outer ring  52  or integrated therein. 
         [0066]      FIGS. 1 through 7  show that rolling bearing  50  includes at least one channel  41 ,  42 ,  45 ,  41 *,  42 *,  45 *,  51   a ,  51   b ,  51   a ′,  52   a ,  52   b ,  52   a ′,  53   a ,  53   b ,  53   a ′ for conducting hydraulic pressure medium P. 
         [0067]    For the purpose of transferring hydraulic pressure medium P from a stationary component  31 ,  30  to a rotatable component  11 ,  10 , rolling bearing  50 , within the scope of  FIGS. 1 ,  5 ,  6  and  7 , includes a pressure medium transfer element  40  in the form of an independent component or an independent component arrangement. 
         [0068]    Within the scope of the specific embodiments illustrated in  FIGS. 2 ,  3  and  4 , at least one rolling bearing component  53 ,  51 ,  52  is designed to transfer hydraulic pressure medium P from a stationary component  31 ,  30  to a rotatable component  11 ,  10  and is itself used as pressure medium transfer element  40 ,  40 *. 
         [0069]    Pressure medium transfer element or rolling bearing components  40 ,  40 *,  53 ,  51 ,  52  designed for pressure medium transfer each include one or multiple annular channels  41 ,  45 ,  41 *, 45 *, each of which has an annular channel opening  411 ,  452 ,  412 *, 451 * extending in the circumferential direction of the annular channel  41 ,  45 ,  41 *, 45 *, and at least one radial channel opening  412 ,  451 ,  411 *,  452 * opposite annular channel opening  411 ,  452 ,  412 *,  451 * and emptying into a radial channel  42 ,  42 *,  11 . It is facilitated that a channel of the stationary component, in particular pressure medium channel  31  of cylinder head-affixed component  30 , communicates with a channel of the rotatable component, in particular radial channels  11  of camshaft  10 , via annular channel opening  411 ,  452 ,  412 *,  451 * and the at least one radial channel opening  412 ,  451 ,  411 *,  452 * of annular channel(s)  41 ,  45 ,  41 *, 45 * of pressure medium transfer elements  40 ,  40 *. 
         [0070]    To conduct pressure medium P past the ball cage of rolling bearing  50  and not through it, rolling bearing inner ring  51  or rolling bearing inner ring  51  and rolling bearing outer ring  52  and possibly also rolling bearing ball cage ring  53  have an axially elongated design. 
         [0071]    Within the scope of the specific embodiment illustrated in  FIG. 1 , rolling bearing  50  includes not only rolling bearing inner ring  51 , rolling bearing outer ring  52  and rolling bearing ball cage ring  53 , with rolling bearing balls  54  situated therein, but also a pressure medium transfer element  40 , which includes an annular channel  41  having a radially outer annular channel opening  411  extending in the circumferential direction of annular channel  41  and multiple radially inner radial channel openings  412  opposite annular channel opening  411  as well as multiple radial channels  42  which each empty into one of radial channel openings  412  of annular channel  41 . 
         [0072]    Pressure medium transfer element  40  is an independent annular component or component arrangement. Pressure medium transfer element  40  may include, for example, an annular base body  43 , in which annular channel  41  is provided in the form of an annular grove, multiple radial channels  42  extending through annular base body  43  and emptying into annular groove-shaped annular channel  41 . Alternatively—as explained in greater detail in FIGS.  5  through  7 —pressure medium transfer element  40  includes an annular base body  43  in the form of an annular U profile having an essentially axially oriented profile middle section and two profile side sections extending radially outwardly, radial channels  42  extending through the profile middle section. 
         [0073]      FIG. 1  shows that pressure medium transfer element  40  is situated between rolling bearing inner ring  51  and rolling bearing outer ring  52 . In the specific embodiment illustrated in  FIG. 1 , pressure medium transfer element  40  is fastened to rolling bearing inner ring  51 , in particular the lateral surface thereof  51 , in particular via its inner lateral surface. However, it is also possible to fasten pressure medium transfer element  40  to a different component of rolling bearing  50 , for example rolling bearing outer ring  52  or rolling bearing ball cage ring  53 , or to situate pressure medium transfer element  40 , loosely or floatingly supported, between rolling bearing inner ring  51  and rolling bearing outer ring  52  (not illustrated), whereby pressure medium transfer element  40  should then have a different design. 
         [0074]    For the purpose of fastening to the rolling bearing outer ring, the pressure medium transfer element may have, for example, a reversed design and include an annular channel having a radially inner annular channel opening extending in the circumferential direction of the annular channel and multiple radially outer radial channel openings opposite the annular channel opening as well as multiple radial channels which each empty into one of the radial channel openings of the annular channel (not illustrated). 
         [0075]    For the purpose of fastening to the rolling bearing ball cage ring or for a loosely or floatingly supported arrangement, the pressure medium transfer element may include, for example, an annular channel having a radially inner annular channel opening extending in the circumferential direction of the annular channel and multiple radially outer radial channel openings, an annular channel having a radially outer annular channel opening extending in the circumferential direction of the annular channel as well as multiple radial channels, which each connect the annular channel having the radially outer annular channel opening to the annular channel having the radially inner annular channel opening (not illustrated). In a loosely or floatingly supported arrangement, the position of the pressure medium transfer element may be secured or blocked radially by the rolling bearing inner ring and the rolling bearing outer ring. The position of the pressure medium transfer element may be secured or blocked axially by the rolling bearing ball cage ring and/or the rolling bearing inner ring and/or the rolling bearing outer ring and/or, if necessary, one or multiple additional components (not illustrated). 
         [0076]    Within the scope of the specific embodiment illustrated in  FIG. 1 , rolling bearing outer ring  52  includes a radial channel  52   a ′, and rolling bearing inner ring  51  includes multiple radial channels  51   a ′ which empty radially into an annular channel  51   a  of rolling bearing inner ring  51 . 
         [0077]    Radial channel  52   a ′ of rolling bearing outer ring  52  empties radially into annular channel  41  of pressure medium transfer element  40 , a radially inner opening of radial channel  52   a ′ of rolling bearing outer ring  52  being situated opposite, in particular directly adjacent to, radially outer annular channel opening  411  of pressure medium transfer element  40 . Annular channel  41  of pressure medium transfer element  40 , in turn, empties into radial channels  42  of pressure medium transfer element  40 . Radial channels  42  of pressure medium transfer element  40 , in turn, empty radially into radial channels  51   a ′ of rolling bearing inner ring  51 , radially inner openings of radial channels  42  of pressure medium transfer element  40  being situated opposite, in particular directly adjacent to, radially outer openings of radial channels  51   a ′ of rolling bearing inner ring  51 . In this way, radial channel  52   a ′ of rolling bearing outer ring  52  communicates with radial channels  51   a ′ of rolling bearing inner ring  51  via pressure medium transfer element  40 , in particular via annular channel  41  and radial channels  42  of pressure medium transfer element  40 . 
         [0078]      FIG. 1  furthermore shows that pressure medium channel  31  of cylinder head-affixed component  30  empties radially into radial channel  52   a ′ of rolling bearing outer ring  52 , a radially inner opening  312  of pressure medium channel  31  being situated opposite, in particular directly adjacent to, a radially outer opening of radial channel  52   a ′ of rolling bearing outer ring  52 . Radial channels  51   a ′ of rolling bearing inner ring  51  empty into annular channel  51   a  of rolling bearing inner ring  51 . Annular channel  51   a  of rolling bearing inner ring  51 , in turn, empties radially into radial channels  11  of camshaft  10 , a radially inner annular channel opening of annular channel  51   a  of rolling bearing inner ring  51  being situated opposite, in particular directly adjacent to, radially outer openings of radial channels  11  of camshaft  10 . In this way, pressure medium channel  31  communicates with radial channels  11  of camshaft  10  via radial channel  52   a ′ of rolling bearing outer ring  52  and via pressure medium transfer element  40 , in particular via annular channel  41  and radial channels  42  of pressure medium transfer element  40  and via radial channels  51   a ′ and annular channel  51   a  of rolling bearing inner ring  51  and, in turn, with hydraulic phase adjusting device  20  via radial channels  11  as well as interior  12  of camshaft  10 . A pressure medium transfer from stationary pressure medium channel  31  of cylinder head-affixed component  30  to rotatable radial channels  11  of camshaft  10  and, in particular to rotatably situated phase adjusting device  20 , may thus be advantageously implemented. 
         [0079]    Within the scope of the embodiment illustrated in  FIG. 1 , annular channel  51   a  of rolling bearing inner ring  51  is used, in particular, to avoid an angle-oriented alignment of rolling bearing inner ring  51  with respect to radial channels  11  of camshaft  10  during mounting and makes it possible to advantageous simplify the mounting of rolling bearing inner ring  51  onto camshaft  10 . 
         [0080]    In the specific embodiment illustrated in  FIG. 1 , however, pressure medium transfer element  40  should be mounted in an angle-oriented manner with respect to radial channels  51   a ′ of rolling bearing inner ring  51  on rolling bearing inner ring  51 , and rolling bearing outer ring  52  should be mounted in an angle-oriented manner with respect to pressure medium channel  31  of cylinder head-affixed component  30 . 
         [0081]    To avoid these angle orientations as well or to increase their tolerance range (not illustrated), a (mounting) annular channel and/or a (mounting) radial channel having a radial channel opening enlarged axially and/or in the circumferential direction may be provided between the radial channel of the pressure medium transfer element and the radial channel of the rolling bearing inner ring and/or between the radial channel of the rolling bearing outer ring and the pressure medium channel, which may be provided, for example in the pressure medium transfer element or the rolling bearing inner ring or in the rolling bearing outer ring or the cylinder head-affixed component. An angle-oriented mounting may be avoided with the aid of a (mounting) annular channel. With the aid of a (mounting) radial channel having a radial channel opening which is enlarged axially and/or in the circumferential direction, in particular compared to the adjacent openings, at least the tolerance range of the angle orientation may be advantageously increased and the mounting simplified thereby. 
         [0082]    Within the scope of the specific embodiment illustrated in  FIG. 1 , a sealing of the pressure medium transfer system may be implemented with the aid of a clearance fit between pressure medium transfer element  40  and rolling bearing outer ring  52 . However, it is also conceivable to implement a seal with the aid of sealing rings or a compression seal (see  FIGS. 5 through 7 ). 
         [0083]    The specific embodiment illustrated within the scope of  FIG. 2  essentially differs from the specific embodiment illustrated in  FIG. 1  in that pressure medium transfer element  40  is fastened to rolling bearing ball cage ring  53 , or it is integrated therein, which means that rolling bearing ball cage ring  53  itself includes channels  53   b ,  41 ;  53   a ′,  42 ;  53   a ,  45  for transferring hydraulic pressure medium P from a stationary component  31 ,  30  to a rotatable component  11 ,  10 . 
         [0084]    Rolling bearing ball cage ring  53  may be fastened to rolling bearing inner ring  51  or to rolling bearing outer ring  52  as well as loosely or floatingly supported or rotatably situated with respect to rolling bearing inner ring  51  and rolling bearing outer ring  52 . 
         [0085]    For this reason or—as explained in greater detail in connection with FIG.  1 —to avoid an angle-oriented mounting, the specific embodiment illustrated in  FIG. 2  also differs from the specific embodiment illustrated in  FIG. 1  in that pressure medium transfer element  40  or rolling bearing ball cage ring  53  includes not only one, in particular outer, annular channel  53   b ,  41  but also two annular channels  53   b ,  41 ;  53   a ,  45  connected to each other via radial channels  53   a ′,  42 , the one annular channel  53   b ,  41  being formed radially outwardly from the other annular channel  53   a ,  45 , and radial channels  53   a ′,  42  extending radially between the two annular channels  53   b ,  41 ;  53   a ,  45 . 
         [0086]    Outer annular channel  53   b ,  41  of pressure medium transfer element  40  or of rolling bearing call cage ring  53  has a radially outer annular channel opening  411  and multiple radially inner radial channel openings  412 , inner annular channel  53   a ,  45  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  having a radially inner annular channel opening  452  and multiple radially outer radial channel openings  451 . Radial channels  53   a ′,  42  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  connect outer annular channel  53   b ,  41  having radially outer annular channel opening  411  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  to inner annular channel  53   a ,  45  having radially inner annular channel opening  452  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  and each empty into outer annular channel  53   b ,  41  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  via a radially inner outer radial channel opening  412 , on the one hand, and into inner annular channel  53   a ,  45  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  via a radially outer inner radial channel opening  451 , on the other hand. 
         [0087]    Radial channel  52   a ′ of rolling bearing outer ring  52  empties radially into outer annular channel  53   b ,  41  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53 , a radially inner opening of radial channel  52   a ′ of rolling bearing outer ring  52  being situated opposite, in particular, directly adjacent to, radially outer annular channel opening  411  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53 . Outer annular channel  53   b ,  41  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53 , in turn, empties into inner annular channel  53   a ,  45  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  via radial channels  53   a ′,  42  of pressure medium transfer element  40  or rolling bearing ball cage ring  53 . Inner annular channel  53   a ,  45  of pressure medium transfer element  40  or rolling bearing ball cage ring  53 , in turn, empties radially into radial channels  51   a ′ of rolling bearing inner ring  51 , radially inner annular channel opening  452  of inner annular channel  53   a ,  45  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  being situated opposite, in particular, directly adjacent to, radially outer openings of radial channels  51   a ′ of rolling bearing inner ring  51 . In this way, radial channel  52   a ′ of rolling bearing outer ring  52  communicates with radial channels  51   a ′ of rolling bearing inner ring  51  via pressure medium transfer element  40 , in particular rolling bearing ball cage ring  53 , in particular via annular channels  53   b ,  41 ;  53   a ,  45  and radial channels  53   a ′,  42  of pressure medium transfer element  40  or rolling bearing ball cage ring  53 . 
         [0088]    Radial channels  51   a ′ of rolling bearing inner ring  51  empty into annular channel  51   a  of rolling bearing inner ring  51 . Annular channel  51   a  of rolling bearing inner ring  51 , in turn, empties radially into radial channels  11  of camshaft  10 , a radially inner annular channel opening of annular channel  51   a  of rolling bearing inner ring  51  being situated opposite, in particular, directly adjacent to, radially outer openings of radial channels  11  of camshaft  10 . 
         [0089]    Pressure medium channel  31  of cylinder head-affixed component  30  empties radially into radial channel  52   a ′ of rolling bearing outer ring  52 , a radially inner opening  312  of pressure medium channel  31  being situated opposite, in particular, directly adjacent to, a radially outer opening of radial channel  52   a ′ of rolling bearing outer ring  52 . 
         [0090]    In this way, pressure medium channel  31  communicates with radial channels  11  of camshaft  10  via radial channel  52   a ′ of rolling bearing outer ring  52  and via pressure medium transfer element  40  or rolling bearing ball cage ring  53 , in particular via annular channels  53   b ,  41 ;  53   a ,  45  and radial channels  53   a ′,  42  of pressure medium transfer element  40  or of rolling bearing ball cage ring  53  and via radial channels  51   a ′ and annular channel  51   a  of rolling bearing inner ring  51  and, in turn, with hydraulic phase adjusting device  20  via radial channels  11  as well as interior  12  of camshaft  10 . A pressure medium transfer from stationary pressure medium channel  31  of cylinder head-affixed component  30  to rotatable radial channels  11  of camshaft  10  and, in particular, to rotatably situated phase adjusting device  20  may thus be advantageously implemented. 
         [0091]    Within the scope of the specific embodiment illustrated in  FIG. 3 , rolling bearing  50 , in particular rolling bearing inner ring  51 , is designed to transfer hydraulic pressure medium P from a stationary component  30  to a rotatable component  10 . Rolling bearing inner ring  51 ,  43  is designed to be elongated axially with respect to rolling bearing outer ring  52  and rolling bearing ball cage ring  53  and includes an outer annular channel  51   b ,  41  having a radially outer annular channel opening  411  extending in the circumferential direction of outer annular channel  51   b ,  41  and multiple radially inner radial channel openings  412  opposite annular channel opening  411 , and an inner annular channel  51   a ,  45  having a radially inner annular channel opening  452  extending in the circumferential direction of inner annular channel  51   a ,  45  and multiple radially outer radial channel openings  451  opposite annular channel opening  452 , as well as radial channels  51   a ′,  42  which connect outer annular channel  51   b ,  41  having radially outer annular channel opening  411  to inner annular channel  51   a ,  45  having radially inner annular channel opening  452  and each emptying, in particular, into one of radial channel openings  412 ,  451  of the two annular channels  51   b ,  41 ;  51   a ,  45 . 
         [0092]    Within the scope of the specific embodiment illustrated in  FIG. 3 , pressure medium channel  31  empties, in particular, directly into outer annular channel  51   b ,  41  of rolling bearing inner ring  51 , in particular, a radially inner opening  312  of pressure medium channel  31  being situated opposite, in particular, directly adjacent to, radially outer annular channel opening  411  of rolling bearing inner ring  51 . Inner annular channel  51   a ,  45  of rolling bearing inner ring  51  empties, in particular radially, into radial channels  11  of camshaft  10 , radially inner annular channel opening  452  of inner annular channel  51   a ,  45  of rolling bearing inner ring  51  being situated opposite, in particular directly adjacent to, radially outer openings  111  of radial channels  11  of camshaft  10 . 
         [0093]    Since outer annular channel  51   b ,  41  of rolling bearing inner ring  51  is connected to inner annular channel  51   a ,  45  of rolling bearing inner ring  51  by radial channels  51   a ′,  42  of rolling bearing inner ring  51 , it is thus made possible that, in particular, stationary pressure medium channel  31  communicates with, in particular, rotatable radial channels  11  of camshaft  10  via the two annular channels  51   b ,  41 ;  51   a ,  45  and radial channels  51   a ′,  42  of rolling bearing inner ring  51  and with hydraulic phase adjusting device  20  via these radial channels  11  as well as interior  12  of camshaft  10 . 
         [0094]      FIG. 3  furthermore shows that sealing rings  51   c ,  44  may also be used instead of one or multiple clearance fits to seal the pressure medium transfer system.  FIG. 3  shows that pressure rolling bearing inner ring  51  includes two sealing rings  51   c ,  44 , which extend essentially in parallel to the two axially outer sides of outer annular channels  51   b ,  41 . Sealing rings  51   c ,  44  are situated in sealing ring receptacles  51   d ,  46 , which are provided in the form of annular indentations in the outer lateral surface of rolling body inner ring  51  and which extend essentially in parallel to the two axially outer sides of outer annular channels  51   b ,  41 . Within the scope of the specific embodiment illustrated in  FIG. 3 , rolling bearing inner ring  51  is fastened to the outer lateral surface of camshaft  10  via its inner lateral surface. Due to the fixed connection, within the scope of this specific embodiment, additional sealing ring receptacles and sealing rings in the inner lateral surface of annular base body may be dispensed with. 
         [0095]      FIG. 4  shows another specific embodiment, in which both rolling bearing inner ring  51  and rolling bearing outer ring  52  are designed to transfer hydraulic pressure medium P from a stationary component  31 ,  30  to a rotatable component  11 ,  10  and are themselves used as pressure medium transfer elements  40 ,  40 *. 
         [0096]    Rolling bearing inner ring  51  includes an annular channel  51   b ,  41  having a radially outer annular channel opening  411  and multiple radially inner radial channel openings  412 , an annular channel  51   a ,  45  having a radially inner annular channel opening  452  and multiple radially outer radial channel openings  451  as well as multiple radial channels  51   a ′,  42 , which connect annular channel  51   b ,  41  having radially outer annular channel opening  411  of rolling bearing inner ring  51  to annular channel  51   b ,  45  having radial inner annular channel opening  451  of rolling bearing inner ring  51 . Radial channels  51   a ′,  42  of rolling bearing inner ring  51  each empty into a radially inner radial channel opening  412  of annular channel  51   b ,  41  having radially outer annular channel opening  411  of rolling bearing inner ring  51  and into a radially outer radial channel opening  451  of annular channel  51   a ,  45  having radially inner annular channel opening  411  of rolling bearing inner ring  51 . 
         [0097]    Rolling bearing outer ring  52  also includes an annular channel  52   a ,  45 * having a radially outer annular channel opening  451 * and multiple radially inner radial channel openings  452 *, an annular channel  52   b ,  41 * having a radially inner annular channel opening  412 * and multiple radially outer radial channel openings  411 * as well as multiple radial channels  52   a ′,  42 *, which connect annular channel  52   a ,  45 * having radially outer annular channel opening  451 * of rolling bearing outer ring  52  to annular channel  52   b ,  41 * having radially inner annular channel opening  412 * of rolling bearing outer ring  52 . Radial channels  52   a ′,  42 * of rolling bearing outer ring  52  each empty into a radial inner radial channel opening  452 * of annular channel  52   a ,  45 * having radially outer annular channel opening  451 * of rolling bearing outer ring  52  and into a radially outer radial channel opening  411 * of annular channel  52   b ,  41 * having radially inner annular channel opening  412 * of rolling bearing outer ring  52 . 
         [0098]    Rolling bearing inner ring  51  and rolling bearing outer ring  52  have an axially elongated design with respect to rolling bearing ball cage ring  53 , rolling bearing inner ring  51  and rolling bearing outer ring  52  being directly adjacent to and opposite each other in the sections designed for pressure medium transfer and, in particular, rolling bearing ball cage ring  53  not extending between the sections of rolling bearing inner ring  51  and rolling bearing outer ring  52  designed for pressure medium transfer. 
         [0099]    Within the scope of the specific embodiment illustrated in  FIG. 4 , a sealing of the pressure medium transfer system may be implemented, in particular, with the aid of a clearance fit between surfaces facing one another of rolling bearing inner ring  51  and rolling bearing outer ring  52 . 
         [0100]    Radially inner annular channel opening  412 * of annular channel  52   b ,  41 * of rolling bearing outer ring  52  is directly adjacent to and opposite radially outer annular channel opening  411  of annular channel  51   b ,  41  of rolling bearing inner ring  51 . 
         [0101]    As a result, inner annular channel  52   b ,  41 * of rolling bearing outer ring  52  empties radially into outer annular channel  51   b ,  41  of rolling bearing inner ring  51 . 
         [0102]    Since outer annular channel  52   a ,  45 * of rolling bearing outer ring  52  empties into inner annular channel  52   b ,  41 * of rolling bearing outer ring  52  via radial channels  52   a ′,  42 * of rolling bearing outer ring  52 , and outer annular channel  51   b ,  41  of rolling bearing inner ring  51  empties into inner annular channel  51   a ,  45  of rolling bearing inner ring  51  via radial channels  51   a ′,  42  of rolling bearing inner ring  51 , outer annular channel  52   a ,  45 * of rolling bearing outer ring  52  may communicate with inner annular channel  51   a ,  45  of rolling bearing inner ring  51  in this way. 
         [0103]      FIG. 4  furthermore shows that pressure medium channel  31  of cylinder head-affixed component  30  empties radially into outer annular channel  52   a ,  45 * of rolling bearing outer ring  52 , a radially inner opening  312  of pressure medium channel  31  being situated opposite, in particular, directly adjacent to, radially outer annular channel opening  411  of outer annular channel  52   a ,  45 * of rolling bearing outer ring  52 . Inner annular channel  51   a ,  45  of rolling bearing inner ring  51  empties into radial channels  11  of camshaft  10 , radially inner annular channel opening  452  of inner annular channel  51   a ,  45  of rolling bearing inner ring  51  being situated opposite, in particular, directly adjacent to, radially outer openings  111  of radial channels  11  of camshaft  10 . In this way, pressure medium channel  31  communicates with radial channels  11  of camshaft  10  via annular channels  52   a ,  45 *;  52   b ,  41 * and radial channels  52   a ′,  42 * of rolling bearing outer ring  52  and annular channels  51   b ,  41 ;  51   a ,  45  and radial channels  51   a ′,  42  of rolling bearing inner ring  51 . A pressure medium transfer from stationary pressure medium channel  31  of cylinder head-affixed component  30  to rotatable radial channels  11  of camshaft  10  and, in particular, to rotatably situated phase adjusting device  20  may thus be advantageously implemented. 
         [0104]    Within the scope of the embodiment illustrated in  FIG. 4 , outer annular channel  52   a ,  45 * of rolling bearing outer ring  52  and inner annular channel  51   a ,  45  of the rolling bearing inner ring are used, in particular, to avoid an angle-oriented alignment of rolling bearing outer ring  52  with respect to pressure medium channel  31  or of rolling bearing inner ring  51  with respect to radial channels  11  of camshaft  10  during mounting and make it possible to advantageous simplify the mounting of rolling bearing outer ring  52  on cylinder head-affixed component  30  and of rolling bearing inner ring  51  on camshaft  10 . 
         [0105]      FIGS. 5 through 7  show enlarged schematic cross sectional views to illustrate different embodiments of pressure medium transfer elements  40  or sealing concepts. 
         [0106]    In particular,  FIGS. 5 through 7  show pressure medium transfer elements  40 , which include an annular base body  43  in the form of an annular U profile, which includes an essentially axially oriented profile middle section and two profile side sections extending radially outwardly, radial channels  42  extending through the profile middle section. 
         [0107]      FIGS. 5 and 7  show that essentially may be understood to mean, in particular, that—to the extent that the profile side sections of the cross-sectional surface have a similar, in particular radial, extension to one another—the intermediate profile middle section may have shape deviations and may be provided, for example, with a wavy or bent design, as illustrated in  FIG. 5  or  7 . 
         [0108]    Pressure medium transfer elements  40 , which are designed as explained within the scope of  FIGS. 5 through 7 , may be used, for example, in the specific embodiments illustrated within the scope of  FIG. 1  or  2  and be situated, in particular, between rolling bearing inner ring  51  and rolling bearing outer ring  52 . 
         [0109]    Within the scope of the specific embodiment illustrated in  FIG. 5 , the profile middle section has, in particular, two lateral subsections, which are bent radially inwardly, and one subsection, which extends therebetween and is bent radially outwardly. Radial channels  42  extend through the subsection bent radially outwardly, the two lateral subsections bent radially inwardly being used as sealing ring receptacles  46  for sealing rings  44 . A profile having a cross section of this type may generally also be referred to as a W profile or an M profile, it being possible to view this as a special type of U profile. 
         [0110]    An outer annular channel  41  is provided by the profile middle section and the two profile side sections connected thereto and extending radially outwardly, an inner annular channel  45  being provided by the two lateral subsections bent radially inwardly and the subsection of the profile middle section extending therebetween and bent radially outwardly. 
         [0111]    The specific embodiment illustrated within the scope of  FIG. 6  has in common with the specific embodiment illustrated in  FIG. 5  the fact that pressure medium transfer element  40  includes an annular base body  43  in the form of an annular U profile having an axially oriented profile middle section and two profile side sections extending radially outwardly, radial channels  42  extending through the profile middle section. In contrast to the specific embodiment illustrated in  FIG. 5 , the profile middle section here is, however, provided with an axially linear or planar and not a wavy design, for which reason annular base body  43  has only one outer annular channel  41  within the scope of the specific embodiment illustrated in  FIG. 6 . 
         [0112]    Moreover, in contrast to the specific embodiment illustrated in FIG.  5 —instead of sealing rings—a compression seal is used for sealing the pressure medium transfer system, annular base body  43  of pressure medium transfer element  40  itself functioning as a compression seal. The sealing effect is achieved by the fact that the profile side sections are pressed against the adjacent component to be sealed, in this case rolling body outer ring  52 , upon the application of pressure medium. Rolling bearing outer ring  52  includes a compression sealing contact and accommodating section  52   c , against which the profile side sections of annular base body  43  are pressed upon the application of pressure medium. Annular base body  43  is fastened to the outer lateral surface of rolling bearing inner ring  51  via the inner lateral surface of the profile middle section. 
         [0113]    In contrast to the specific embodiment illustrated in  FIG. 6 , within the scope of the specific embodiment illustrated in  FIG. 7 , annular base body  43  is supported loosely or floatingly between rolling bearing inner ring  51  and rolling bearing outer ring  52 . Within the scope of the specific embodiment illustrated in  FIG. 7 , the profile middle section is furthermore not axially linear or planar, as in the specific embodiment illustrated in  FIG. 6 , but rather only essentially axial, namely wavy, and designed similarly to the specific embodiment illustrated in  FIG. 5 , for which reason annular base body  43  within the scope of the specific embodiment illustrated in  FIG. 7  has an outer annular channel  41  and an inner annular channel  45 . 
         [0114]    Since annular base body  43  is situated in a loosely or floatingly supported manner, its radial and axial positions are stabilized by compression sealing contact and accommodating section  52   c  of rolling bearing outer ring  52 . Upon the application of pressure medium, not only the profile side sections are pressed against compression sealing contact and accommodating section  52   c , but the lateral subsections of the profile middle section, bent radially to the inside, are also pressed against the outer lateral surface of rolling bearing inner ring  51 . Inner radial channel  45  of annular base body  43  makes it possible that a transfer of pressure medium is ensured even with a rotation of annular base body  43  with respect to rolling bearing inner ring  51  and its radial channels  51   a ′ or with respect to rolling bearing outer ring  52  and its radial channel  52   a ′ and, in particular, no angle orientation is required. 
       LIST OF REFERENCE NUMERALS 
       [0000]    
       
           10  Camshaft 
           11  Radial channel 
           111  Radially outer radial channel opening 
           12  Camshaft interior 
           13  Closing element 
           14  Annular channel 
           15  Sealing ring 
           16  Sealing ring receptacle 
           20  Hydraulic phase adjusting device 
           30  Cylinder head-affixed component, in particular cylinder head 
           31  Pressure medium channel 
           312  Radially inner pressure medium channel opening 
           40 , 40 * Pressure medium transfer element 
           41 , 41 * Annular channel 
           411  Radially outer annular channel opening 
           411 * Radially outer radial channel opening 
           412  Radially inner radial channel opening 
           412 * Radially inner annular channel opening 
           42 , 42 * Radial channel 
           43  Annular base body 
           44  Sealing ring 
           45 , 45 * Annular channel 
           451  Radially outer radial channel opening 
           451 * Radially outer annular channel opening 
           452  Radially inner annular channel opening 
           452 * Radially inner radial channel opening 
           46  Sealing ring receptacle 
           50  Rolling bearing 
           51  Rolling bearing inner ring 
           52  Rolling bearing outer ring 
           53  Rolling bearing ball cage ring 
           54  Rolling bearing ball 
           51   a , 52   a , 53   a  Annular channel 
           51   a ′, 52   a ′, 53   a ′ Radial channel 
           51   b , 52   b , 53   b  Annular channel 
           51   c  Sealing ring 
           51   d  Sealing ring receptacle 
           52   c  Compression sealing contact and accommodating section 
         P Pressure medium 
         R Rotation axis of the camshaft