Abstract:
A cover ( 4 ) for covering an axial side of a rotor core ( 6 ) that is arranged in a camshaft adjuster ( 50 ) and has a passage bore ( 28 ) for holding a locking pin ( 30 ) with which the rotor core ( 6 ) can be secured against rotation relative to a stator ( 54 ) of the camshaft adjuster ( 50 ). The specified cover includes a base body ( 8 ) for axially covering at least one area of the rotor core ( 6 ) with the passage bore ( 28 ) and a support element ( 38 ) that is arranged on the base body ( 8 ) for the axial counter support of the locking pin ( 30 ).

Description:
INCORPORATION BY REFERENCE 
     The following documents are incorporated herein by reference as if fully set forth: German Patent Application No.: 102012200756.3, filed Jan. 19, 2012. 
     FIELD OF THE INVENTION 
     The invention relates to a cover for covering an axial side of a rotor core that is arranged in a camshaft adjuster, a rotor with the cover, and a camshaft adjuster with the rotor. 
     BACKGROUND 
     From DE 10 2009 031 934 A1, a rotor is known consisting of several components for a camshaft adjuster. The rotor has, in detail, a rotor core that is covered with plastic in the axial direction. 
     In the rotor core, a blind hole is formed in which a locking pin can be guided that secures the rotor against the stator relative to a rotation. 
     SUMMARY 
     The object of the invention is to improve the known rotor. 
     This object is met with a rotor having one or more features of the invention. Preferred improvements are described below and in the claims. 
     The invention provides that forming a counter support of the locking pin is not in the blind hole of the rotor core, but instead on the cover for the rotor core. 
     This is based on the idea that the base of the blind hole of the rotor core of the type noted above as a counter support for the locking pin is too expensive, because the locking pin can also be effectively counter supported with lower quality materials like those of the cover. 
     Therefore, the invention provides a cover for covering an axial side of a rotor core arranged in a camshaft adjuster, wherein the rotor core has a passage bore for holding a locking pin. With the locking pin, the rotor core can be secured against rotation relative to a stator of the camshaft adjuster. The indicated cover comprises a base body for the axial covering of at least one area of the rotor core with the passage bore and a support element arranged on the base body for the axial counter support of the locking pin. 
     The specified cover allows packaging space to be saved in a camshaft adjuster, because a base that is present in the blind hole in the rotor core of the type noted above and that unnecessary widens the axial thickness of the rotor core can be eliminated. The rotor core can also be produced by the movement of the support element into the cover for economically more favorable basic shapes, because the rotor core can now be produced with a passage bore that can be produced with a significantly wider spectrum of production methods, such as sintering, than a rotor core with a blind hole. 
     In one refinement of the invention, the specified cover comprises a ventilation channel with an opening in the area of the support element. The ventilation channel allows an air exchange between the passage bore guiding the locking pin and the surroundings of the camshaft adjuster and thus a free movement of the locking pin in the passage bore of the rotor core. 
     In one special refinement of the invention, the ventilation channel is guided at least partially axially through the base body, which allows particularly quick ventilation with few friction losses of the air at the channel walls. 
     In an additional refinement of the invention, the ventilation channel is guided out from the opening in the area of the support element along a surface of the base body on which the support element is arranged. In this way, an axial weakening of the ventilation channel can be reduced due to the opening. Here, the ventilation channel can be guided in alternatively already provided axial openings through the base body in an axial opening provided extra for the ventilation channel through the base body or to a radial edge of the support element, in order to open the ventilation channel to the surroundings of the camshaft adjuster. 
     In another refinement, the specified cover comprises a cartridge that can be inserted concentrically into the passage bore of the rotor core and is held by the support element, wherein the cartridge is provided for engagement in a recess on the locking pin. The cartridge can have a cylindrical, conical, or pyramidal construction and supports the locking element during operation in the passage bore of the rotor core against tilting onto the walls of the passage bore of the rotor core and thus prevents the passage bore of the rotor core and/or the locking pin from being damaged. Through the construction of the cartridge on the support element, this can be formed integrally with the support element and thus with the base body of the specified cover. This can be realized through the injection molding of the cartridge on the support element. 
     In an alternative refinement of the invention, the specified cover comprises a suspension for a restoring element by which the locking pin can be counter supported on the support element. In this way, all of the essential elements can be produced for the support of the locking pin in the passage bore of the rotor core integrally with the cover. 
     In another refinement of the invention, the specified cover comprises a recess that is arranged in a different location than the support element and through which material and thus weight can be saved in the construction of the cover. 
     The invention also provides a rotor for a camshaft adjuster that comprises a rotor core. The rotor core has a hub for holding a camshaft and a passage bore guided through the hub for holding a locking pin with which the rotor core can be secured against rotation relative to a stator of the camshaft adjuster. The specified rotor further comprises a specified cover that is set on the rotor core, wherein the support element axially covers the passage bore of the hub. The cover can be set arbitrarily on the rotor core. Thus, the cover can be initially pre-manufactured and then mounted on the rotor core. In an especially preferred way, the cover is molded on the rotor core, wherein the rotor core itself forms the template form for the production of the cover. 
     In a preferred refinement, the rotor core comprises the locking pin held in the passage bore of the hub. 
     The invention also provides a camshaft adjuster that comprises a stator for storing rotational energy from a crankshaft of an internal combustion engine and a specified rotor that is arranged so that it can rotate in the stator for the output of rotational energy from the crankshaft to the camshaft. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments of the invention will be explained below with reference to the drawings, in which: 
         FIG. 1  is an exploded view of a rotor with a cover according to the invention, 
         FIG. 2  is a section view of a camshaft adjuster with the rotor from  FIG. 1 , 
         FIG. 3  is a perspective view of an alternative part of the cover of the rotor of  FIG. 1 , 
         FIG. 4  is a section view of a camshaft adjuster with another rotor, and 
         FIG. 5  is a perspective view of a part of the cover of the rotor of  FIG. 4 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the figures, the same elements are provided with the same reference symbols and are described only once. 
       FIG. 1  is referenced that shows an exploded view of a rotor  2  with a cover  4  according to the invention. 
     The rotor  2  is provided for installation in a camshaft adjuster that is still to be described and transmits a rotational energy from a not-shown crankshaft of an internal combustion engine to a not-shown camshaft controlling the internal combustion engine. 
     In the present construction, the cover  4  is made from plastic and covers a rotor core  6  in the axial direction. It includes a first cover part  8  that covers the rotor core  6  axially from one side and a second cover part  10  that covers the rotor axially from another side lying opposite the first cover part  8  in the axial direction. 
     The rotor core  6  has a hub  12  on which radial vanes  14  are set. A camshaft receptacle  16  is guided through the hub  12 . The camshaft can be held in this receptacle. Ports  18  that are provided in a way that is known to someone skilled in the art for supplying the chambers of the camshaft adjuster with hydraulic fluid extend outward in the radial direction from the camshaft receptacle  16 . The ports  18  are lines that are partially open in the axial direction. Furthermore, three pin bores  20  are guided through the rotor core  6 . Pins  22  can be inserted in these bores for fixing a restoring spring to be mounted between the rotor  2  and a stator of the camshaft adjuster. In the rotor core  6  there are also material cutouts  24  that are used so that the rotor core has a lighter construction and to save material. Rails  26  are formed underneath the vanes  14 . These rails protect the cover parts  8 ,  10  peripherally against rotation relative to the rotor core  6 . 
     A receptacle bore  28  in which a locking pin  30  shown in  FIG. 2  can be guided is also guided through the rotor core  6 . This locking pin  30  will be discussed in more detail below. 
     Each of the cover parts  8 ,  10  has four molded parts  32  that can engage in the rails  26  on the vanes  14  radially in a positive-fit connection. On each cover part  8 ,  10  one of the molded parts  32  is extended axially in the direction of the rotor core  6  and is thus used as a spacer. Furthermore, each cover part  8 ,  10  has molded elements  34  that can engage with a positive fit in the material recesses  24 . The molded elements  34  meet each other in the material recesses  24  in the axial direction and are thus likewise used as spacers. For saving material, the molded elements can have hollow constructions. Furthermore, each cover part  8 ,  10  has port elements  36  that axially close the areas of the ports  18  that are guided through the rotor core  6  and that are open. 
     The first cover part  8  has a support element  38  on which the locking pin  30  can be supported axially. For this purpose, the support element  38  comprises an axial recess  40  that will not be described and from which a cartridge  42  projects in the axial direction. The first cover part  8  furthermore has receptacle bores  44  in which the pins  22  can be supported for the spring suspension. 
     The second cover part  10  has an open segment  46  between which the receptacle bore  28  of the rotor core  6  can be inserted. In the open segment  46 , a supply channel  47  is guided that can be connected, for example, to one of the chambers of the camshaft adjuster formed between the vanes  14 , in order to fill the receptacle bore  28  with hydraulic fluid and to control the position of the locking pin  30  based on the hydraulic fluid. Accordingly, the receptacle opening  28  in the area of the supply channel  47  can have an axial notch  49 . Furthermore, the second cover part  10  has guides  48  that guide the pins  22  for the spring suspension radially onto the axial side of the second cover part  10  opposite the rotor core  6 . 
       FIG. 2  is referenced that shows a section view of a camshaft adjuster  50  with the rotor  2  from  FIG. 1 . 
     As can be seen from  FIG. 2 , the locking pin  30  has a recess in which the cartridge  42  is inserted. Here, the locking pin  30  is supported by a spring  43  in the axial recess  40 . The axial recess  40  of the support element  38  has a ventilation opening  52  through which air can be discharged. This air can collect in a space that is limited by the locking pin  30 , the receptacle bore  28 , and the first cover part  8 . 
     The rotor  2  is held in a stator  54  that has, on its periphery, teeth  56  in which a not-shown chain can engage for the transmission of force between the crankshaft on the internal combustion engine and the stator  54 . The two axial cover surfaces of the stator  54  are each closed by a cover  58  that is fixed on the stator  54  by screws  59 . 
     The cover  58  on the axial side of the second cover part  10  has an axial recess  60  in which the locking pin  30  can engage. In the rest state of the camshaft adjuster  50 , the locking pin  30  prevents the rotor  6  from being able to rotate against the stator  54 . If oil is fed to the camshaft adjuster in a way that is known to those skilled in the art for moving the rotor  6  relative to the stator  54 , a part of this oil is pumped via the supply channel  47  into the axial recess  60 , so that the oil presses the locking pin  30  axially into the receptacle bore  28  and rotation of the rotor  6  opposite the stator  54  is possible. Axial recess  60  can be provided at several peripheral positions on the corresponding cover  58 , in order to be able to secure the rotor  6  in multiple positions against rotation relative to the stator  54 . 
     A spiral spring  62  is tensioned between one of the pins  22  on the rotor  6  and a suspension not shown further on the stator  54 , in order to overcome a drag moment of the camshaft. 
     The spiral spring  62  is covered by a spring cover  64  that engages axially in a collar  66  on the corresponding cover  58  on which the spiral spring  62  is arranged. 
       FIG. 3  is referenced that shows a perspective view of an alternative first cover part  8  of the rotor  6  of  FIG. 1 . 
     As is to be seen from  FIG. 3 , instead of or as an alternative to the ventilation opening  52 , a ventilation channel  60  is provided that enables the ventilation of the space between the cover part  8 , the receptacle opening  28 , and the corresponding cover  58  via the receptacle bores  44  for the pins  22  for spring suspension. 
       FIG. 4  is referenced that shows a section view of a camshaft adjuster  50  with an alternative rotor  6 . 
     In the rotor  6  of  FIG. 4 , the first cover part  8  has no cartridge  42  on the support element  38 , wherein the ventilation opening  52  can be guided centrally through the first cover part  8 . 
     A corresponding first cover part  8  is shown in  FIG. 5  that shows the first cover part  8  in a perspective view. 
     LIST OF REFERENCE NUMBERS 
     
         
           2  Rotor 
           4  Cover 
           6  Rotor core 
           8  Cover part 
           10  Cover part 
           12  Hub 
           14  Vane 
           16  Camshaft receptacle 
           18  Port 
           20  Pin bore 
           22  Pin 
           24  Material cutout 
           26  Rail 
           28  Receptacle bore 
           30  Locking pin 
           32  Molded part 
           34  Molded element 
           36  Port element 
           38  Support element 
           40  Recess 
           42  Cartridge 
           43  Spring 
           44  Receptacle bore 
           46  Segment 
           47  Supply channel 
           48  Guide 
           49  Notch 
           50  Camshaft adjuster 
           52  Ventilation bore 
           54  Stator 
           56  Teeth 
           58  Cover 
           60  Recess 
           62  Spiral spring 
           64  Spring cover