WO2008015062A2

WO2008015062A2 - Metal sealing sheet for a camshaft adjuster, and camshaft adjuster

Info

Publication number: WO2008015062A2
Application number: PCT/EP2007/056565
Authority: WO
Inventors: Jutta Ruckriegel; Sven Weisser
Original assignee: Schaeffler Kg
Priority date: 2006-08-02
Filing date: 2007-06-29
Publication date: 2008-02-07
Also published as: WO2008015062A3; DE102006036052B4; DE102006036052A1

Abstract

The invention relates to a camshaft adjuster (1). If a locking pin (24) in a slot guide (26) that is open in the axial direction is held in an activated position, an end face (27) of the locking pin (24) is supported directly against a torsion spring (16). The invention proposes that a metal sheet (38) be arranged between the locking pin (24) and torsion spring (16), with the metal sheet being supported in a form-fitting manner against a support element (19). The support element (19) can simultaneously serve to support a spring base point (18) of the torsion spring (16).

Description

Sealing plate for a camshaft adjuster and camshaft adjuster

description

Field of the invention

The invention relates to a sealing plate for a camshaft adjuster according to the preamble of claim 1. Furthermore, the invention relates to a camshaft adjuster for an internal combustion engine, in particular according to the preamble of claim 8.

Background of the invention

DE 100 84 408 B4 discloses a vane-type camshaft adjuster, the drive element of which is driven by a crankshaft in the form of a drive gear via a traction means such as a chain or a belt. Rotationally connected to the drive wheel is a "stator" in which a rotor is rotatably arranged to generate a control angle. The rotor is rotatably connected to a camshaft. In accordance with the adjustment angle, a relative angular position between the camshaft and the drive wheel and thus the crankshaft can be influenced, which is accompanied by a change in the timing. For a vane-type construction, the rotor has vanes which are displaceable in the circumferential direction to generate a set angle in accordance with a hydraulic pressure in control chambers of the stator. On the side facing away from the camshaft, the stator is formed with a disc which limits the control chambers in the axial direction. The force relationships between the rotor and the stator are, in addition to the hydraulic conditions in the area of the vanes, influenced by a torsion spring whose bases are supported on the one hand on the stator and on the other hand on the rotor. The torsion spring is arranged on the side of the disk facing away from the rotor with a plurality of windings about the longitudinal axis. The radially outer foot point is supported relative to the stator via screws, which serve at the same time a fixing of the disc in the stator. The radially inner base of the torsion spring is bent in a U-shape and engages positively a rectangular partial cross section of a support element. The support element furthermore has a cylindrical extension, with which it extends through a central bore of the disc while permitting relative rotation. The extension is rotatably connected in the stator with the camshaft, in particular via an end face of the rotor.

A designated in the document as a locking pin pin is guided displaceably in a bore of the rotor parallel to the longitudinal axis of the camshaft adjuster, wherein the axial position of the pin can be influenced by the force relationships of a compression spring and / or the hydraulic conditions in the region of end faces of the pin. The disk of the stator has a corresponding, oriented in the axial direction blind hole-shaped recess. For an activated position of the pin, in particular a start, intermediate, middle, early or late position, the pin exits with an end portion of the rotor and into the recess of the disc of the stator, so that the rotational degree of freedom between Rotor and stator is limited.

Further prior art is known for example from DE 103 54 586 A1 and DE 199 08 934 A1.

Object of the invention

The object of the present invention is to propose a sealing plate and a camshaft adjuster, for which the structural design and the contact conditions of the components cooperating with a pin of a camshaft adjuster are improved, in particular with regard to

the space design, - the mechanical resistance, the hydraulic actuation of the pin and / or the axial size.

Summary of the invention

According to the invention the object is achieved by a sealing plate having the features of the independent claim 1. Further embodiments of the invention will become apparent for a sealing plate with the features of claims 2 to 5. A further solution of the problem underlying the invention is given by a camshaft adjuster with the features of claim 6. A further embodiment of this solution is obtained according to the features of Claim 7. A camshaft adjuster with the features of claim 8 represents an alternative solution to the problem underlying the invention. Further embodiments will be apparent according to the features of claims 9 to 12.

The present invention is based initially on the basic idea that for an axial support of the pins in the activated position according to DE 100 84 408 B4, the recess in the disc is formed as a blind hole, so that on the one hand in the bottom of the recess a sufficient wall thickness must remain and on the other hand, a sufficient depth of the recess for a desired function ensuring positive engagement must be present. This requires that the disc in practice a minimum axial dimension of 4 to 8 mm must have.

Another problem for such, also referred to as a "closed gate" blind hole-shaped recesses is that it is desirable to release the pin from the activated position, the front side of the pin, which is arranged in the recess with a hydraulic pressure of Apply camshaft adjuster. However, the front side of the pin is not freely accessible for a "closed gate", so that a supply of a hydraulic medium for transferring the pin to a deactivated position is problematic and u. U. additional measures such as an additional piston surface, grooves or hydraulic channels required.

The previously explained realization carries DE 199 08 934 A1 account that the camshaft adjuster is designed with an "open gate", so that the pin can pass through itself without axial stop surface freely through a recess of the stator. This means that the recess for the pin in the disc is not formed in a longitudinal section U-shaped, but rather continuously, for example as a through hole. In addition to a possibly simplified manufacturing possibility for the recess as a result of the formation as a continuous recess, an axial extension of an associated part of the stator, for the prior art of the disc, be made smaller. In addition, the end face of the pin itself is freely accessible for being acted upon by a hydraulic medium for transferring the pin into a deactivated position. This is particularly the case when a module with return spring is installed on the customer's request in front.

While, according to DE 199 08 934 A1, a stop of the pin in the activated position is given by a housing wall, such an embodiment is problematic if the camshaft adjuster has a torsion spring which can be arranged in the exit area of the pin. In such a case, the pin is moved with an induction of the activated position in the axial direction further away from the camshaft, until it abuts against the Torsion spring comes. The inventors have recognized that such direct contact between pin and torsion spring is disadvantageous. In particular, there is a reduction in the fatigue strength of the torsion spring and / or the pin by a notch effect between the edges of the torsion spring and the contact surfaces.

For the first solution of the object underlying the invention, the invention proposes to provide for a camshaft adjuster a sealing plate which has a central recess which can be aligned coaxially to a longitudinal axis of the camshaft adjuster and by during assembly and / or during operation the camshaft adjuster other components and / or tools can pass. Around the central recess encircling the sealing sheet has a circumferentially oriented bead. Such a bead can be of any desired design, for example as a full bead, for which the sheet lies approximately in one plane in a portion located radially inward of the bead and a radially outer portion, or as a half bead for which the bead forms a radially inner portion connects with an axially offset, radially outer portion. In the region of the bead, the sealing sheet is elastically deformable in accordance with the mechanical properties, so that the axial extent of the sealing sheet can be reduced by generating defined normal forces, contact forces and thus sealing forces on the contact surfaces of the contact partners when the sealing sheet is subjected to contact between two sealed contact partners.

The sealing sheet according to the invention is formed multifunctional in that in addition to the mentioned sealing function for the contact partners, the sealing plate has a radially inwardly extending into the recess tab. The tab has an axial contact surface on which the pin can come into abutment or support for defining an activated position for use of the sealing plate in a camshaft adjuster.

The mechanical properties of the tab can be suitably designed the, for example

to form a resilient stop for the pin or with regard to a suitable design of the contact surface with an O berfläche, which is particularly resistant to wear.

For a further embodiment of the invention is utilized that a bead can run arbitrarily over the sealing plate. The invention proposes, in the event that a mounting hole or a thread or other fastening element is to be provided on the sealing element, to guide the bead around a fastening bore. In the event that a seal radially inward of the mounting hole is desired, the bead is preferably to be guided radially inwardly of the mounting hole - and vice versa.

For a further embodiment of the invention, an outlet of a medium to be sealed by a mounting hole of the sealing plate can be avoided that the bead branches in the region of the mounting hole in two part thicknesses. The two partial thicknesses can then be guided radially inward and radially outward on the fastening bore and enclose the fastening bore.

A resilient and / or damping effect of the tab of the sealing plate can be increased for a further embodiment of the sealing plate, characterized in that the surface of the sealing plate is provided at least in the region of the tab with a rubber coating.

On the other hand, for an alternative embodiment of the sealing plate, the surface of the same in the region of sealing surfaces with the contact partners may be provided with a rubber coating, while the surface of the tab is formed without gumming. For example, wear of the rubber coating in the region of the tab and its contact surface can be avoided in this way. For this purpose, the sealing plate already targeted with the rubber coating only in the desired areas are produced. Alternatively, the rubber coating can be arranged in areas where this is not actually desired. Subsequently, by appropriate manufacturing processes, for example by sandblasting, the gumming in areas where it is not advantageous to be removed. In the camshaft adjuster can in this way, for example.

a cleanliness risk and / or

Channels clogging particles due to chipped rubber residues

be avoided.

A second solution of the object underlying the invention relates to a camshaft adjuster in which one of the above-explained sealing plates is used in that this is pressed against a housing cover under elastic deformation of the bead for the purpose of sealing the housing cover. The housing cover limits (at least) in the axial direction a receiving space for the torsion spring. For a particularly advantageous embodiment of the receiving space is integrated into the hydraulic flow to a chamber of the vane-type design camshaft adjuster. If an end face of the pin is connected to the receiving space through the recess of the rotor, a transfer of the pin from the activated position into the deactivated position can be effected by applying hydraulic medium to the receiving space. For such an embodiment, the sealing element is aligned such that the tab is disposed at the circumferential angle of the pin and extends at least partially between the torsion spring and the pin. Thus, a direct contact between the pin and the torsion spring can be avoided.

For a further embodiment of the camshaft adjuster according to the invention covers in an activated position, the tab about ² I ₂ , the end face of the pins, in particular also deviations of 20% or 10% of the wording "about 2/3 of the face" should be included. To- Next has shown for this embodiment that it is not necessary that the tab necessarily extends over the entire face of the pin. Rather, the pin in the axial direction in the activated position can be supported by the sealing plate even if the tab from the outside I diglich over a portion of the end face extends inwardly. As an alternative or cumulative advantage of this embodiment of the invention remains for a flat contact the face of the pin on the tab V _{3 of} the end face (with the aforementioned deviations) free and can thus be acted upon with a hydraulic medium to the pin from the activated position in to transfer the deactivated position.

For a third solution of the object underlying the invention also takes place a separation between the torsion spring and pin on a metal sheet. In this case, however, the sheet is not integrally formed with the sealing plate, but rather supported against a support member on which a base of the torsion spring is supported. From such a support element, the sheet extends in the radial direction to the outside. Such a metal sheet can be produced in a particularly simple manner and integrated into the camshaft adjuster while minimizing the installation space conditions, in particular the axial size.

In the event that an exact angular relationship between the pin on the one hand and the sheet is required on the other hand, according to a further embodiment of the invention, the angular orientation of the support member relative to the stator or rotor form-fitting predetermined as well as the angular orientation of the sheet against the support element given a positive fit , Also conceivable is an immediate support between the plate and the stator or rotor via a positive connection in Umfangsgehchtung to specify the angular orientation of the sheet.

A further simplification can be brought about according to the invention in that the support element has a radially oriented extension, for example in the form of a rib, a feather key or the like, via which with corres- dierenden abutment surfaces, the angular orientation of the support member relative to the stator or rotor and the angular orientation of the sheet relative to the support element can be specified.

For a further embodiment of the invention, the camshaft adjuster, the sheet has an approximately cylindrical collar or collar. The federal government can rest with its inner surface on a lateral surface of the support element, whereby an assembly aid can be given and / or the sheet relative to the support element in operation can be aligned under rigid support of acting forces and moments.

The radial extension of the sheet is preferably selected such that in the activated position, the sheet covers 50% to 70% of the end face of the pin, so that the radial extent of the sheet is minimized and / or a portion of the end face of the pin can remain free, so that an admission with a hydraulic medium is possible here.

Advantageous developments of the invention will become apparent from the claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the introduction to the description are merely examples, without them necessarily having to be achieved by embodiments according to the invention. Further features are the drawings - in particular the illustrated geometries and the relative dimensions of several components to each other and their relative arrangement and operative connection - refer. The combination of features of different embodiments of the invention or of features of different claims is also possible deviating from the chosen relationships of the claims and is hereby stimulated. This also applies to those features which are shown in separate drawings or are mentioned in their description. These features can also be combined with features of different claims. Likewise, in the claims listed features for further embodiments of the invention can be omitted. Brief description of the drawings

Further features of the invention will become apparent from the following description and the accompanying drawings in which embodiments of the invention are shown schematically. Show it:

Figure 1 shows a camshaft adjuster with "open gate" without separating plate between pin and torsion spring in a semi-longitudinal section in a three-dimensional view;

FIG. 2 shows a detail of the camshaft adjuster according to FIG. 1 with the surrounding area of the pin in a partial longitudinal section;

Figure 3 shows a detail of the camshaft adjuster according to Figure 1 with a sealing plate, which is clamped between a housing cover and the stator in the vicinity of a flange, in a partial longitudinal section;

Figure 4 shows a portion of the sealing plate according to Figure 3 in a three-dimensional view;

Figure 5 shows a detail of the camshaft adjuster according to Figure 1 with a sealing plate which is clamped between a housing cover and the stator, in a partial longitudinal section;

FIG. 6 shows a partial region of the sealing plate according to FIG. 5 in a spatial representation;

Figure 7 is a sealing plate without radially inwardly into a central recess extending tab in an end view; FIG. 8 shows a sealing plate with a tab extending radially inwards in a recess in an end view;

Figure 9 shows a detail of a camshaft adjuster with a sealing plate with tab in an end view;

Figure 10 shows a detail of a camshaft adjuster in a longitudinal section with a supported on a support plate, which is arranged as a stop between a torsion spring and a pin;

Figure 1 1, the cut shown in Figure 10 sheet in a frontal

View;

FIG. 12 shows the sheet according to FIG. 11 in a side view;

Figure 13 shows the sheet according to Figures 1 1 and 12 in a three-dimensional representation and

Figure 14 shows a camshaft adjuster in a three-dimensional exploded view with mounting screws, a housing cover, a support element, a torsion spring, a plate, a pin and a rotor-stator unit.

Detailed description of the invention

FIG. 1 shows a camshaft adjuster 1. The camshaft adjuster 1 is, for example, a camshaft adjuster in vane-type construction, although in principle any other type of camshaft adjuster can also be used.

The camshaft adjuster 1 has a drive wheel 2, via which this drive connection with a crankshaft is. The drive wheel 2 is rotatably connected to a stator 3, which is formed with a pot-like housing 4 and a housing cover 5. About an annular disc 6, which is oriented transversely to a longitudinal axis 7-7 of the camshaft adjuster 1, the limited of the housing 4 and the housing cover 5 interior is divided into two axially adjacent subspaces. The partial space facing the camshaft engages, in a manner not shown, with the rotor 8 having the vane, which is connected or clamped with the aid of a central screw 9 with an end-face threaded bore of the camshaft. The arranged on the side facing away from the camshaft 6 disc space forms an annular, around the longitudinal axis 7-7 circumferential chamber 10. The chamber 10 is sealed in the contact area between the housing 4 of the stator 3 and housing cover 5 by interposing a sealing plate 1 1, which can be tightened by tightening fastening screws 12 between see housing 4 and housing cover 5.

As can be seen in particular from FIG. 10, the housing cover 5 has a central threaded bore 13 into which, with the interposition of a sealing element 14, a closure element 15 or a screw cap is screwed. Between stator 3 and rotor 8, a torsion spring 16 is interposed, which extends with multiple windings about the longitudinal axis 7-7. The radially outer spring base point 17 is supported relative to the stator 3, while the radially inner spring base point 18 is supported relative to a support element 19.

The support member 19 having a constant wall thickness has a collar 20 with a square outer cross section, which is encompassed by the spring base point in a form-fitting manner. The collar 20 is connected via a radially oriented web 21 with a cylindrical lateral surface 22, which eventually merges into a radially oriented, annular web 23. In the mounting position shown in Figure 10, the head of the central screw 9 presses the web 23 to the rotor 8, so that the support member 19 fixed to the rotor 8 and the Camshaft is connected.

Figure 2 shows a pin 24 which is slidably received in a recess 25 of the rotor 8 in the axial direction and parallel to the longitudinal axis 7-7 and extends in the activated position shown in Figure 2 by a continuous recess 26 of the disc 6, so that Stator 3 and rotor 8 are positively connected to each other via the pin 24 in the circumferential direction. The recess thus forms an "open backdrop". An end face 27 of the pin 2 abuts against the web 21 and / or on the torsion spring 16.

Figures 3 and 5 show the arrangement of the sealing plate 1 1 between the housing cover 5 and the housing 4, wherein in Figure 3, the surrounding area of a fastening screw 12 is shown, while in Figure 5, a contact area is shown away from the fastening screw 12. Figures 4 and 6 show the sealing element 1 1 in a spatial representation with a Figures 3 and 5 corresponding section.

For the illustrated embodiment, the sealing plate 1 1 is formed with a bead 28 which is formed circumferentially in the circumferential direction and is generally arranged radially outboard of the sealing plate 11. The bead 28 is formed as a full bead, wherein a radially outboard from the bead 28 arranged portion 29 and a radially inwardly disposed from the bead 28 portion 30 lie approximately in a plane. The bead 28 thus has two Teilicken 31, 32, in the region where the sealing plate 1 1 is bent. In the region of a fastening bore 33, through which the fastening screw 12 extends in the installed state, the partial corrugations 31, 32 diverge so that the radially inner partial bead 31 extends radially inwards around the fastening bore and then again radially outwards. The fastening bore 33 is enclosed between the two partial beads 31, 32.

In the area of the screw recesses, bent-over position tabs are arranged in the axial direction, which are inserted into the corresponding cutouts. gen / holes in the locking cover / the disc in the radial direction and spring loaded in Umfangsgehchtung intervene. As a result, the sealing disc is pre-positioned during assembly

While Figure 7 shows the sealing plate 1 1 with a central recess 34 which is formed substantially circular, Figure 8 shows an embodiment of the invention, in which a radially inwardly oriented, in a first approximation trapezoidal radially inwardly tapered tab 35 radially extends inwardly, wherein the tab 35 is preferably in the plane of the subregion 30. The opening angle of the trapezoidal sides of the tab 35 is in particular such that cut extensions of the sides in front of the longitudinal axis and the center of the sealing plate 1 1.

As can be seen from FIG. 9, in the installed state, the tab 35 of the sealing plate 11 with a contact surface 36 forms a stop or an elastic limit for the pin 24, which predetermines the activated position of the pin. It can also be seen in FIG. 9 that the tab 35 only extends radially inward to the extent that a portion 37 of the end face of the pin 24 remains freely accessible, for example for the hydraulic pressure of a hydraulic medium arranged in the chamber 10. By means of a specification of the circumferential angle α according to FIG. 8, by which the contact surface 36 is offset relative to the fastening bore 33 of the sealing plate 11, it can be ensured that the tab 35 is actually arranged and mounted "flush" with the pin 24 to the desired extent. In addition to the illustrated variant of a radially inner lying free partial area, a free partial area can also result as a result of an offset between the tab 35 and the longitudinal axis of the pin 24 in the circumferential direction.

Figures 10 to 14 show an alternative embodiment, for which a stop is not formed by a tab 35 of a sealing plate 1 1, but rather by a plate 38. The plate 38 is basically annular in shape with a transverse to the longitudinal axis 7-7 oriented annular surface 39th and a hollow cylindrical collar 40 or collar. The plate 38 is inside radially outwardly over approximately half the radial extent of the sheet 38 extending recesses 41, 42 which have a semi-circular contour in the first approximation and extend both in the region of the collar 40 and the annular surface 39. The recesses 41, 42 are not arranged exactly opposite one another, but offset in the circumferential direction by an angle ß, whereby a clear assembly assignment is given. For such an embodiment, the support element 19 is provided with two extensions 43, 44, which have a contour corresponding to the recesses 41, 42 and are arranged corresponding to the recesses 41, 42 in the circumferential direction offset to the longitudinal axis 7-7. The rotor 8 of the camshaft adjuster 1 also has corresponding recesses 45. In addition to the illustrated semicircular contours of the recesses 41, 42, 45 and extensions 43, 44, any other contouring configurations are possible which ensure positive engagement in the circumferential direction.

With an assembly of the camshaft adjuster 1, the support element 19 enters with the lateral surface 22 and the projections 43, 44 in the recesses 45 of the rotor 8, wherein, as can be seen in Figure 10, between the rotor 8 and web 21, the sheet 38 is trapped. The collar 40 is supported on the outer surface of the lateral surface 22. An anti-rotation of the sheet 38 relative to the support member 19 is given by the positive connection between recesses 41, 42 and projections 43, 44. The annular surface 39 of the sheet 38 extends just so far radially outward that the end face 27 of the pin 24 is only partially covered by the sheet 38 and a portion 37 remains free, as can be seen from Figure 10. On the collar 20, the spring base point 18, the torsion spring 16 is supported outside. The housing cover 5 is finally screwed with fastening screws 12 to the disc 6, so that the torsion spring 16 is received in the internally formed, sealed chamber 10.

The sealing plate 1 1 is preferably punched out of a 0.2 mm thick, pre-gummed sheet of spring steel. An integration of the additional tab 35 in the sealing plate 1 1 can be realized by an adaptation in the punching tool become. The rubberized surface of the tab 35 can be used with sufficient fatigue strength as impact and sound attenuation as a stop for the pin 24. If a fatigue strength of the rubberized surface is not given, this rubber layer in the contact area can be removed by appropriate manufacturing methods, such as sandblasting. Thus, a cleanliness risk can be avoided by chipped rubber residues. The embodiment of the invention with a sealing plate 11 is characterized by a high fatigue strength of the spiral torsion spring 16 and the pin 24 and is a robust and easy to manufacture solution, which is cost-neutral compared to known from the prior art solutions.

By suitable design specifications for the sealing plate 1 1 or the plate 38, in particular recesses 41, 42, 45 and extensions 43, 44 a faultless installation by simple insertion without additional adjustments or settings can be made possible. The sheet 38 may preferably be punched out of a 0.1 to 0.5 mm thick hardened spring steel sheet and / or formed. The outer diameter of the sheet 38 is designed so that an LJ coverage of 50% to about 70% of the end surface 27 of the pin 24 remains. A hardened surface of the sheet 38 should be used with sufficient fatigue strength as impact and sound attenuation as a stop for the pin 24. As a result, a notch effect of the pin 24 on the torsion spring 16 is avoided. A centering of the sheet 38 takes place with a transition fit on the support element 19, for which the collar 40 of the sheet 38 is used. Alternatively, a centering of the sheet 38 on the housing cover 5 is alternatively possible. Alternative centering possibilities are also possible.

It is also possible that the recesses 41, 42 and extensions 43, 44 omitted, especially in the case that from a functional perspective, a rotation of the sheet 38 is desired in operation to regularly distribute deformations and wear on the plate 38, whereby a fatigue strength of the sheet 38 can be improved. The support element 19 is preferably a deep-drawn sheet metal part. The weight of the sheet 38 may be in the single-digit gram range. "This page was received blank upon filing the international application."

LIST OF REFERENCE NUMBERS

1 Camshaft adjuster 31 Partial inside

2 drive wheel 32 partial thickness outside

3 stator 33 mounting hole

4 housing 34 centr. Recess sealing plate

5 Housing cover 35 Tab

6 disc 36 contact surface

7 longitudinal axis 37 free section pin

8 rotor 38 plate

9 central screw 39 annular surface

10 chamber 40 fret

11 sealing plate 41 recess

12 fixing screw 42 recess

13 threaded hole 43 extension

14 sealing element 44 extension

15 closure element 45 recess

16 torsion spring 46 position tab

17 spring base (radially outside)

18 spring base (radially inside)

19 support element

20 fret

21 footbridge

22 lateral surface

23 footbridge

24 pin

25 recess (for pin rotor)

26 recess (for pin disc)

27 face

28 beading

29 partial area radially outside

30 partial area radially inward

Claims

claims

1. Sealing plate (1 1) for a camshaft adjuster (1) with a circumferentially circumferential and elastically deformable bead (28) and a central recess (34), characterized in that the sealing plate (1 1) is a radially inwardly in the recess (34) extending tab (35) having an axial abutment surface (36) for a pin (24) for fixing and / or limiting an adjustment angle of the camshaft adjuster (1).

Second sealing plate (1 1) according to claim 1, characterized in that the bead (28) is guided around a mounting hole (33).

3. Sealing plate (1 1) according to claim 2, characterized in that the bead (28) in the region of the fastening bore (33) in two partial thicknesses (31,

Branched 32 and the mounting hole (33) between the part beads (31, 32) is enclosed.

4. Sealing plate (1 1) according to one of claims 1 to 3, characterized marked, that the surface of the sealing plate (1 1) at least in the region of

Lug (35) is provided with a rubber coating.

5. Sealing plate (1 1) according to one of claims 1 to 3, characterized in that the surface of the sealing plate (11) is provided in the region of sealing surfaces with a rubber coating, while the contact surface (36) of the tab (35) formed without gumming is.

6. camshaft adjuster (1) for an internal combustion engine with a) a stator (3), b) a relative to the stator (3) along a setting angle movable rotor (8), c) a pin (24), in an activated position an actuating angle of the camshaft adjuster (1) is positively limited or defined, d) a torsion spring (16) acting between the stator (3) and the rotor (8), e) a housing cover (5) with which a receiving space (chamber 10) for the torsion spring (16) is limited at least in the axial direction, f) a sealing plate (1 1) according to one of claims 1 to 5, to which the housing cover ( 5) under elastic deformation of the bead (28) is pressed, g) wherein the tab (35) at the circumferential angle of the pin (24) at least partially between the torsion spring (16) and pin (24) is arranged.

7. camshaft adjuster (1) according to claim 6, characterized in that in the activated position, the tab (35) about 2/3 of the end face

(27) of the pin (24) covered.

8. Camshaft adjuster (1) for an internal combustion engine with a) a stator (3), b) a relative to the stator (3) along a setting angle movable rotor (8), c) a pin (24), in an activated position d) a torsion spring (16) acting between stator (3) and rotor (8), e) a housing cover (5) with which a receiving space (chamber 10) for the torsion spring (16) is limited at least in the axial direction, f) a support element (19) with which a spring base (30) of the torsion spring (16) relative to the rotor (8) or stator (3) is supported, characterized in that g) between Torsion spring (16) and pin (24) a plate (38) is arranged, ga) which has a contact surface (36) on which the pin (24) comes into abutment in the active position, bg) on the support element (19) is supported and gc) which of the support element (19) in radial direction extends outwards.

9. camshaft adjuster (1) according to claim 8, characterized in that the angular orientation of the support element (19) relative to the Sta- Tor (3) and the angular orientation of the sheet (38) relative to the support element (19) is given a positive fit.

10. camshaft adjuster (1) according to claim 9, characterized in that the angular orientation of the support element (19) relative to the stator (3) or rotor (8) and the angular orientation of the sheet (38) relative to the support element. (19) via an extension (43, 44) of the support element (19) is predetermined.

11. camshaft adjuster (1) according to one of claims 8 to 10, characterized in that the sheet (38) has an approximately cylindrical collar (40) whose inner surface rests against a lateral surface (22) of the support element (19).

12. camshaft adjuster (1) according to one of claims 8 to 1 1, characterized in that the radial extent of the sheet (38) is selected such that in the activated position, the sheet (38) 50 to 70% of the end face (27) of the Pins (24) covered.