DE102006036052B4 - Sealing plate for a camshaft adjuster and camshaft adjuster with a sealing plate - Google Patents

Abstract

Sealing plate (11) for a camshaft adjuster (1) with a peripherally encircling and elastically deformable bead (28) and a central recess (34), characterized in that the sealing plate (11) extends radially inwardly into the recess (34) has 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).

Description

Field of the invention

The invention relates to a sealing plate for a camshaft adjuster according to the preamble of claim 1 and a camshaft adjuster with such a sealing plate.

Background of the invention

Out DE 100 84 408 B4 is known a vane-type camshaft adjuster, the drive element is driven in the form of a drive gear via a traction means such as a chain or a belt of a crankshaft. 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 slidable 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 is supported relative to the stator via screws, which serve at the same time a mounting 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 member further includes a cylindrical extension for extending therethrough through a central bore of the disc while permitting relative rotation therethrough. 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 disc 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 for example off DE 103 54 586 A1 and DE 199 08 934 A1 known.

The US 6 155 129 A shows a camshaft adjuster with a spring whose restoring torque is equal to or smaller than the friction torque of the camshaft before or during the start of the internal combustion engine.

Object of the invention

• – der Bauraumgestaltung,
• – der mechanischen Beständigkeit,
• – der hydraulischen Betätigung des Pins und/oder
• – der axialen Baugröße.

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

• - 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. The present invention is based 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 recess 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 must have a minimum axial dimension of 4 to 8 mm.

Another problem for such, also referred to as "closed gate" blind hole-shaped recesses is that it is desirable to release the pin from the activated Position the end face of the pin, which is arranged in the recess to pressurize with a hydraulic pressure of the 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 knowledge contributes DE 199 08 934 A1 account for the fact that the camshaft adjuster is designed with an "open gate", so that the pin can pass freely through an opening of the stator without axial stop surface. 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 component 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 given a stop of the pins in the activated position by a housing wall, such an embodiment is problematic if the camshaft adjuster comprises a torsion spring which can be arranged in the exit region of the pin. In such a case, the pin is moved farther away from the camshaft with the introduction of the activated position in the axial direction until it comes to rest on the torsion spring. 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 surrounding the sealing plate 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 radially inner portion of the bead and a radially outer portion, or as a half bead, for which the bead has a radially inner portion with a axially offset, radially outer portion connects. 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.

• – um einen federnden Anschlag für den Pin zu bilden oder
• – hinsichtlich einer geeigneten Gestaltung der Anlagefläche mit einer Oberfläche, die besonders verschleißfest ist.

The mechanical properties of the tab can be made suitable, for example

• - To form a resilient stop for the pin or
• - With regard to a suitable design of the contact surface with a surface that 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 provided on the sealing element, to lead the bead around a mounting hole. 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 for another Design of the sealing plate can be increased by the fact that the surface of the sealing plate is provided at least in the region of the tab with a rubber coating.

• – ein Sauberkeitsrisiko und/oder
• – Kanäle verstopfende Partikel durch abgeplatzte Gummireste

vermieden werden.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 can already be made specifically with the rubber coating only in the desired areas. 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
• - Channel 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, the receiving space is integrated into the hydraulic flow to a chamber of the vane-type 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 2/3 of 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. First, it has been shown for this embodiment that it is not necessary that the tab necessarily extends over the entire end 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 extends from the outside only over a portion of the end face inwards. 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 1/3 of the face (with the aforementioned deviations) free and can thus be acted upon with a hydraulic medium to the pin of the activated position to transfer to the deactivated position.

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 exemplary, 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:

1 a camshaft adjuster with "open link" without separating plate between pin and torsion spring in a semi-longitudinal section in a spatial representation;

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

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

4 a portion of the sealing plate according to 3 in spatial representation;

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

6 a portion of the sealing plate according to 5 in spatial representation;

7 a sealing plate without radially inwardly extending into a central recess tab in a frontal view;

8th a sealing plate with radially inwardly extending in a recess tab in an end view;

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

Detailed description of the invention

1 shows a camshaft adjuster 1 , In the camshaft adjuster 1 By way of example, it is a vane-type camshaft adjuster, although in principle any other type of camshaft adjuster can also be used.

The camshaft adjuster 1 has a drive wheel 2 , via which it is in drive connection with a crankshaft. The drive wheel 2 is rotationally fixed to a stator 3 Tailed, with a pot-like housing 4 and a housing cover 5 is formed. About an annular disc 6 that are transverse to a longitudinal axis 7 - 7 of the camshaft adjuster 1 oriented, is that of housing 4 and housing cover 5 limited interior divided into two axially adjacent subspaces. The camshaft facing subspace takes in a manner not shown to form control chambers the rotor blade having wings 8th on, using a central screw 9 is connected or braced with a frontal threaded bore of the camshaft. The on the side facing away from the camshaft of the disc 6 arranged subspace forms an annular, around the longitudinal axis 7 - 7 circulating chamber 10 , The chamber 10 is in the contact area between housing 4 of the stator 3 and housing cover 5 sealed by the interposition of a sealing plate 11 which involves tightening fastening screws 12 between housing 4 and housing cover 5 can be tightened.

The housing cover 5 has a central threaded hole 13 , in the interposition of a sealing element 14 a closure element 15 or a screw cap is screwed. Between the stator 3 and rotor 8th is a torsion spring 16 interposed, with multiple turns around the longitudinal axis 7 - 7 extends. The radially outer spring base point 17 is opposite the stator 3 supported, while the radially inner spring base 18 opposite a support element 19 is supported.

The supporting wall having a constant wall thickness 19 has a covenant 20 with square outer cross section, the form-fitting of the spring base point 18 is encompassed. The Bund 20 is via a radially oriented web 21 with a cylindrical surface 22 connected, which finally into a radially oriented, circular web 23 passes. Through the inner bore of the bridge 23 extends the central screw 9 , In the in 10 mounting position shown presses the head of the central screw 9 the jetty 23 to the rotor 8th so that the support element 19 firmly with the rotor 8th and the camshaft is connected.

2 shows a pin 24 in the axial direction and parallel to the longitudinal axis 7 - 7 displaceable in a recess 25 of the rotor 8th is included and in the in 2 shown activated position by a continuous recess 26 the disc 6 extends, so that stator 3 and rotor 8th over the pin 24 are positively connected with each other in the circumferential direction. The recess thus forms an "open backdrop". An end face 27 of the pin 2 is located on the jetty 21 and / or on the torsion spring 16 at.

3 and 5 show the arrangement of the sealing plate 11 between the housing cover 5 and the housing 4 , where in 3 the surrounding area of a fixing screw 12 is shown while in 5 a contact area away from the mounting screw 12 is shown. 4 and 6 show the sealing element 11 in a spatial representation with a den 3 and 5 appropriate cut.

For the illustrated embodiment, the sealing plate 11 with a bead 28 formed, which is circumferentially formed circumferentially and basically radially outboard of the sealing plate 11 is arranged. The bead 28 is formed as a full bead, with a radially outboard of the bead 28 arranged subarea 29 and a radially inward of the bead 28 arranged subarea 30 lying about in one plane. The bead 28 So it has two Teilicken 31 . 32 , in the area of which the sealing plate 11 is bent. In the area of a mounting hole 33 , through which in the installed state, the fastening screw 12 extends, run the Teilicken 31 . 32 apart, in that the radially inner partial thickness 31 radially inward, around the mounting hole and then radially outward. The mounting hole 33 is between the two Teilicken 31 . 32 locked in.

In the area of the screw recesses, bent position tabs are arranged in the axial direction, which engage in the corresponding recesses / bores in the locking cover / disc in the radial direction and in the circumferential direction. This pre-positions the sealing washer during assembly 7 the sealing plate 11 with a central recess 34 shows, which is formed substantially circular, shows 8th an embodiment of the invention, in which a radially inwardly oriented, in a first approximation trapezoidal radially inwardly tapered tab 35 extends radially inward, with the tab 35 preferably in the plane of the subarea 30 lies. The opening angle of the trapezoidal sides of the tab 35 is in particular such that extensions of the sides in front of the longitudinal axis and the center of the sealing plate 11 to cut.

How out 9 can be seen forms the tab in the installed state 35 of the sealing plate 11 with a contact surface 36 a stop or an elastic limit for the pin 24 which specifies the activated position of the pin. It can be seen in 9 continue that the tab 35 only so far extends radially inward, that still a partial area 37 the face of the pin 24 remains freely accessible, for example, for the hydraulic pressure in the chamber 10 arranged hydraulic medium. About a specification of the circumferential angle α according to 8th to the the contact surface 36 opposite the mounting hole 33 of the sealing plate 11 offset, it can be ensured that the tab 35 actually in the desired degree "aligned" to the pin 24 is arranged and mounted. In addition to the illustrated variant of a radially inner free portion, a free portion may also be due to an offset between tab 35 and longitudinal axis of the pin 24 in the circumferential direction.

The sealing plate 11 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 11 can be realized by an adaptation in the punching tool. The rubberized surface of the tab 35 can with sufficient fatigue strength as impact and sound damping as a stop for the pin 24 to be used. 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 characterized by a high fatigue strength of the spiral torsion spring 16 as well as the pin 24 and represents a robust and easy to manufacture solution, which is cost-neutral compared to known from the prior art solutions.

By suitable form specifications for the sealing plate 11 a faultless installation can be made possible by simply inserting without additional adjustments or adjustments.

LIST OF REFERENCE NUMBERS

1

Phaser

2

drive wheel

3

stator

4

casing

5

housing cover

6

disc

7

longitudinal axis

8th

rotor

9

central screw

10

chamber

11

sealing plate

12

fixing screw

13

threaded hole

14

sealing element

15

closure element

16

torsion spring

17

Spring base (radially outside)

18

Spring base (radially inside)

19

supporting

20

Federation

21

web

22

lateral surface

23

web

24

Pin code

25

Recess (for pin rotor)

26

Recess (for pin washer)

27

face

28

Beading

29

Part area radially outside

30

Partial area radially inward

31

Partial tick inside

32

Partial thickness outside

33

mounting hole

34

centr. Recess sealing plate

35

flap

36

contact surface

37

free subarea pin

Claims (7)

Sealing sheet ( 11 ) for a camshaft adjuster ( 1 ) with a peripheral circumferential and elastically deformable bead ( 28 ) and a central one Recess ( 34 ), characterized in that the sealing plate ( 11 ) a radially inwardly into the recess ( 34 ) extending tab ( 35 ) having an axial abutment surface ( 36 ) for a pin ( 24 ) for determining and / or limiting a setting angle of the camshaft adjuster ( 1 ). Sealing sheet ( 11 ) according to claim 1, characterized in that the bead ( 28 ) around a mounting hole ( 33 ) is guided around. Sealing sheet ( 11 ) according to claim 2, characterized in that the bead ( 28 ) in the region of the fastening bore ( 33 ) in two parts ( 31 . 32 Branched and the mounting hole ( 33 ) between the parts ( 31 . 32 ) is included. Sealing sheet ( 11 ) according to one of claims 1 to 3, characterized in that the surface of the sealing plate ( 11 ) at least in the region of the tab ( 35 ) is provided with a rubber coating. Sealing sheet ( 11 ) 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 ) the tab ( 35 ) is formed without gumming. Camshaft adjuster ( 1 ) for an internal combustion engine with a) a stator ( 3 ), b) a relative to the stator ( 3 ) along a pitch movable rotor ( 8th ), c) a pin ( 24 ), which in an activated position, a setting angle of the camshaft adjuster ( 1 ) confined or fixed form-fittingly, d) one between Stator ( 3 ) and rotor ( 8th ) acting torsion spring ( 16 ), 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 ( 11 ) 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 torsion spring ( 16 ) and pin ( 24 ) is arranged. Camshaft adjuster ( 1 ) according to claim 6, characterized in that in the activated position the tab ( 35 ) about 2/3 of the face ( 27 ) of the pin ( 24 ) covered.

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