DE102018111177A1 - Hydraulic camshaft adjuster - Google Patents

Abstract

The invention relates to a hydraulic camshaft adjuster (1) for variably adjusting the timing of gas exchange valves of an internal combustion engine, comprising a stator (2) and a rotor (3) rotatable relative to the stator (2), wherein the stator (2) projects radially inwards Webs (4) are formed and wherein on the rotor (3) radially outwardly projecting wings (5, 35) are formed. Between the stator (2) and the rotor (3) a plurality of hydraulic working spaces (6) are formed, which are each divided by a wing (5, 35) of the rotor (3) into a first working chamber and a second working chamber. In this case, in the rotor (3) has two locking elements (11, 12) for temporary, reversibly releasable fixation of the rotor (3) relative to the stator (2) used in a central position. It is provided that the first locking element (11) and the second locking element (12) in a common locking link (10) are lockable, wherein the center (29) of the first locking element (11) on a different circular diameter about a central axis (28) of the hydraulic camshaft adjuster (1) as the center (30) of the second locking element (12). In this case, a first jet (18) connects the central axis (28) of the hydraulic camshaft adjuster (1) with the first center (29) and a second jet (18) the central axis (28) with the second center (30), wherein the first beam (17) and the second beam (18) enclose an angle (α). The invention further relates to a method for locking the rotor (3) in such a hydraulic camshaft adjuster (1).

Description

The invention relates to a hydraulic camshaft adjuster and a method for locking a rotor of a hydraulic camshaft adjuster according to the preamble of the independent claims.

Hydraulic phaser are used in internal combustion engines to adjust the valve timing of the intake and exhaust valves to a corresponding load state of the internal combustion engine and thus to increase its efficiency. Hydraulic camshaft adjusters are known from the prior art, which operate on the vane principle. In this case, the camshaft adjuster includes a stator and a rotor rotatable relative to the stator, wherein between the stator and the rotor, a working space is formed, which is divided by a wing of the rotor into two working chambers. By a corresponding hydraulic pressurization of the working chambers, the position of the rotor relative to the stator can be changed and thus the timing of the valves can be adjusted. In this case, the rotor is usually adjustable between a late position and an early position, which are defined by corresponding stops on the stator. Further, hydraulic camshaft adjusters are known in which the rotor can be mechanically locked in a center position between the two stops. In this case, hydraulic camshaft adjusters are known in which such a central locking is realized by two locking pins, which can engage in two locking cams. However, a disadvantage of such a solution is that both two locking slots as well as two hydraulic supply channels have to be formed on the rotor in order to pressurize the respective locking slot for hydraulic unlocking, which leads to high production costs and correspondingly high production costs.

From US 2005/0 016 481 A1, a hydraulic camshaft adjuster is known in which two locking elements can engage in a common locking link. In this case, two spring-loaded locking elements are provided on the stator of the hydraulic camshaft adjuster, which engage in a formed on a radially outer surface of the rotor locking slot and thus can lock the rotor relative to the stator.

From the DE 102 17 062 A1 a hydraulic camshaft adjuster is known with a locking mechanism, wherein the locking element is designed as a stepped locking pin, which can engage in a locking link. In this case, the locking pin is arranged in the rotor and can engage in the axial direction in a provided on a cover of the hydraulic camshaft adjuster locking link.

The object of the invention is to reduce the space requirement and the complexity in a hydraulic camshaft adjuster with two locking elements and thus to reduce the manufacturing costs.

The object is achieved by a hydraulic camshaft adjuster for variable adjustment of the timing of gas exchange valves of an internal combustion engine, with a stator and a rotor rotatable relative to the stator, wherein on the stator radially inwardly projecting webs are formed and wherein on the rotor radially outwardly projecting wings are formed. Between the stator and the rotor a plurality of hydraulic working spaces are formed, which are each divided by a wing of the rotor into a first working chamber and a second working chamber. In this case, two locking elements are used for locking the rotor relative to the stator in a central position in the rotor. It is envisaged that the first locking element and the second locking element are lockable in a common locking link, wherein the center of the first locking element lies on another circle diameter about a center axis of the hydraulic camshaft adjuster than the center of the second locking element. In this case, a first beam connects the center axis of the hydraulic camshaft adjuster with the first center point and a second beam connects the central axis with the second center point, wherein the first beam and the second beam include a non-zero angle. The proposed solution over the known from the prior art solution saves a locking link, which can be used to produce the locking link simpler tools. In addition, less material must be removed, which reduces material wear and reduces processing time. Thus, the manufacturing costs for the locking linkage are reduced. Further, on the rotor, a pressure medium supply for a locking link, hereinafter also referred to as C-channel, omitted, which also reduce the manufacturing and tooling costs for the rotor. In addition, the locking link can be made compact and space-saving, whereby this solution can be realized even in confined spaces, especially in hydraulic camshaft adjusters with a relatively small diameter. As a result, the locking elements are arranged obliquely with each other. This arrangement of the locking elements has in terms of space utilization, the multiple use of attacks and of a possible adjustment advantages that would not be given with an arrangement of the locking elements side by side or on a beam.

The features listed in the dependent claims advantageous refinements and improvements of the independent claim specified hydraulic camshaft adjuster are possible.

In a preferred embodiment of the invention it is provided that the first locking element substantially in a wing of the rotor and the second locking element are arranged substantially in a cylindrical body of the rotor or in the transition region between the blade of the rotor and the rotor hub. As a result, the width of the wing compared to known solutions remain almost constant, since only one locking element must be accommodated in the wing. Nevertheless, additional ratchet stages, which favor the rotation of the rotor into the center locking position, advantageously result.

In an advantageous embodiment of the hydraulic camshaft adjuster is provided that in addition to the working chambers, a control chamber is present, wherein the rotor segment is arranged with the locking elements in the control chamber. The control chamber is not used as the working chambers for hydraulic loading of the rotor blades, to rotate the rotor in an adjustment position, but only as a control chamber for the circuit of the locking elements. Thereby, the number of inlet bores for the control chamber can be reduced, which can be omitted in particular expensive production engineering and expensive inclined bores in the rotor. The hydraulic connection between the control chamber and the locking elements via the locking link, which extends beyond the width of the wing with the locking element addition. Thus, pressure medium can flow into the locking link for the hydraulic unlocking of the locking elements. Alternatively or additionally, the hydraulic unlocking can take place via a pressure medium channel in the rotor. Despite elimination of a working space, the pressure transmission ratio for the adjustment of the rotor with respect to a hydraulic camshaft adjuster with an additional working space remain virtually unchanged, since a locking element is arranged in the wing and not both locking elements are housed in the rotor hub. As a result, the bearing diameter can be reduced from rotor to stator and the pressure ratio can be maintained.

In a preferred embodiment of the invention it is provided that the locking link is designed as a stepped locking link, wherein the locking link has at least one base, a middle step and a plateau, wherein the middle step is formed between the base and the plateau. In this case, despite a common locking link the same number of steps for the lock as shown in a camshaft adjuster with two locking latches. The multiple use of the locking stages in the locking link is thereby implemented so that the two locking elements are arranged in the rotor very close to each other, so that a locking element can use the locking stages and stops of the other locking element in the locking link with an adjustment.

According to an advantageous embodiment of the hydraulic camshaft adjuster is provided that both the first locking element and the second locking element abut the bottom of the locking link, when the rotor is locked in a central position. As a result, a stable and functionally reliable locking of the rotor in the center position is possible because the locking elements only stand out from the ground when the locking link is acted upon by a corresponding hydraulic control with pressure. The control is preferably carried out via a pressure medium pump and a central valve of the hydraulic camshaft adjuster and a C-channel, which connects the central valve with the locking link.

In an advantageous embodiment of the invention, it is provided that at the middle stage a first stop surface for the locking elements in the direction "early" and a second stop surface in the direction "late" are formed. The middle stage is made wider than the bottom of the locking link. As a result, manufacturing technology can easily and inexpensively realize a staircase form, on which the locking elements can rest in a downward direction in a rotation in the center position until the locking elements have reached the bottom of the locking link.

In a preferred embodiment of the invention it is provided that the locking link is formed or arranged in a locking cover of the hydraulic camshaft adjuster, which limits the stator and the rotor in the axial direction. A locking link in a cover can be compared to a locking link in the stator or rotor manufacturing technology easily and inexpensively. This can be done in particular by means of a Forming process or a cutting process, in particular a milling process done. Alternatively, it is possible to form the locking link by means of inserts which are inserted into a groove of the locking cover.

It is preferred if the locking cover is designed as a multi-part cover with a first cover part and a second cover part, wherein the first cover part and the second cover part are arranged concentrically with each other. By a multi-part locking cover can be performed in a simple way a multi-level locking link. In this case, the machining of the lid can be simplified by a plurality of components, which can reduce the manufacturing cost of the hydraulic camshaft adjuster. In addition, different materials can be used to realize targeted in the stop areas a high hardness and thus a low wear.

In a preferred embodiment of the hydraulic camshaft adjuster, it is provided that an angle bisector of the angle between the two beams intersects both the first locking element and the second locking element. This ensures that the two locking elements are arranged in the circumferential direction closer together than would be possible with two Verrieglungselementen on the same circle diameter. As a result, the space can be minimized and the adjustment of the rotor can be increased accordingly with the stator unchanged.

In a further improvement of the invention it is provided that the rotor is designed free of oblique holes. As a result, the rotor can be designed more cost-effectively than rotors with a center locking device known from the prior art. The working chambers and the control chamber are connected exclusively by radial bores and / or axial bores with the inlet bores, whereby the manufacturing process can be simplified and the manufacturing costs can be reduced.

According to the invention, a method is proposed for locking a rotor of a hydraulic camshaft adjuster according to the invention, wherein the locking elements successively penetrate into the locking slot upon rotation of the rotor from an adjustment position to the central position, whereby rotation of the rotor in the direction of the center position is possible and counteracts rotation of the rotor the rotation is locked in the middle position. It can be with two locking elements and only one common locking link for the two locking elements represent a locking process, which allows the benefits of the known locking process with two locking slots with less space requirements and reduced manufacturing costs.

• 1 einen erfindungsgemäßen hydraulischen Nockenwellenversteller in einer Schnittdarstellung;
• 2 den Verriegelungsmechanismus des hydraulischen Nockenwellenverstellers in einer vergrößerten Detaildarstellung;
• 3 eine Verdrehung des Rotors aus einer Verstellposition in Richtung „früh“ in die Mittenverriegelungsposition;
• 4 eine Verdrehung des Rotors aus einer Verstellposition in Richtung „spät“ in die Mittenverriegelungsposition; und
• 5 eine Darstellung eines Rotors für einen erfindungsgemäßen hydraulischen Nockenwellenversteller.

The invention is explained below with reference to preferred embodiments with reference to the accompanying figures (Fig.). Identical components or components with the same function are identified by the same reference numerals. Showing:

• 1 a hydraulic camshaft adjuster according to the invention in a sectional view;
• 2 the locking mechanism of the hydraulic camshaft adjuster in an enlarged detail;
• 3 a rotation of the rotor from an adjustment position in the direction "early" in the center locking position;
• 4 a rotation of the rotor from an adjustment position in the direction "late" in the center locking position; and
• 5 a representation of a rotor for a hydraulic camshaft adjuster according to the invention.

1 shows a hydraulic camshaft adjuster 1 according to the vane principle with a stator 2 and one relative to the stator 2 rotatable rotor 3 , Here is the rotor 3 rotatable about an axis of rotation 28 in the stator 2 stored. The stator 2 has several bars 4 on, which in the radial direction of a cylindrical body, hereinafter as the rotor hub 16 referred to, in the direction of a central axis 28 of the hydraulic camshaft adjuster 1 run. Between the rotor 3 and the stator 2 are workrooms 6 formed by radially from a main body of the rotor 3 protruding wings 5 in each case a first working chamber 7 and a second working chamber 8th be divided. At the stator 2 is a drive toothing 38 formed, with which the stator 2 is driven by a crankshaft of an internal combustion engine via a drive means, in particular a timing chain or a toothed belt. The stator 2 is closed at its axial end surfaces in each case by a lid. It is in one of the cover a locking link 10 trained or arranged. The lid with the locking link 10 is also referred to below as a locking lid 13 . 14 . 15 designated. The locking lid 13 can be both one-piece and preferably multi-part with a first cover part 14 and a second lid part 15 be executed. Here are in a multi-part design of the locking lid 13 the lid parts 14 . 15 preferably arranged coaxially with each other. Alternatively, the locking link 10 also in the axial direction between a cover of the hydraulic camshaft adjuster 1 and the stator 2 be arranged. In the rotor 3 are two locking elements 11 . 12 arranged, which not shown springs in each case in an in 5 illustrated recess 26 . 27 of the rotor 3 are stored. Further, on the rotor 3 Oil supply channels 33 . 34 . 36 formed with which the working chambers and / or the locking link 10 can be controlled hydraulically with a pressure medium, in particular with an oil. The rotor 3 has a central opening into which a central valve, not shown for reasons of clarity, can be used to supply the pressure medium to the working chambers 7 . 8th and / or the locking mechanism 10 . 11 . 12 head for. Furthermore, the hydraulic phaser comprises screws 32 , with which the covers for the axial limitation of the stator 2 each with the webs 4 of the stator 2 are bolted. The second locking element 12 is in a wing 5 of the rotor 3 arranged. The first locking element 11 is in the area of the rotor hub 14 arranged. Here are the two locking elements 11 . 12 arranged offset to each other both in the radial direction and in the circumferential direction. If you draw two rays 17 . 18 from the central axis 28 of the hydraulic camshaft adjuster 1 each through the midpoints 29 . 30 the two locking elements 11 . 12 so close the two rays 17 . 18 an angle α one. An angle bisector 31 this angle intersects both the first locking element 11 as well as the second locking element 12 because the midpoints 29 . 30 the locking elements 11 . 12 in the circumferential direction less than the diameter of a locking element 11 . 12 away from each other. Thus, the wing can be 5 with the locking element 12 comparatively narrow, which is correspondingly large adjustment angle for the rotor 3 allows.

In 2 is the locking mechanism 10 . 11 . 12 . 13 of the hydraulic camshaft adjuster 1 shown in an enlarged detail. The locking elements 11 . 12 are preferably designed as spring-loaded cylinder pins. In this case, the first locking element 11 a diameter D ₁ and the second locking element 12 a diameter D ₂ on. Preferably, the diameters D ₁ and D ₂ the same size to equal parts for the locking elements 11 . 12 to be able to use. In the in 2 shown center locking position are both the first locking element 11 as well as the second locking element 12 at the bottom 21 the locking link 10 at. The locking mechanism 10 is designed as a stepped locking link and has in the adjustment "early" a first stop surface 22 and a second stopper surface offset toward the center locking position 24 on. The locking mechanism 10 has in the adjustment "late" a first stop surface 23 and a second stopper surface offset toward the center locking position 25 on. Here are the first stop surfaces 22 . 23 on a first cover part 14 the locking cover and the second stop surfaces on a second cover part 15 educated. The locking reason 21 is also on this second cover part 15 educated.

In 3 is a first embodiment of a locking process of a hydraulic camshaft adjuster according to the invention 1 with two locking elements 11 . 12 and a common locking link 10 for the two locking elements 11 . 12 shown. The illustrated locking link 10 includes a locking lid 14 with a first lid part 14 and a second lid part 15 , In the illustrated starting position I is the rotor 3 of the hydraulic camshaft adjuster 1 adjusted in the direction of "early". Should the rotor 3 Now be rotated from this adjustment position in the center position and locked there, a successive locking process. In the initial situation I is the rotor 3 so far from the center position in the direction of "early" twisted that both the first locking element 11 as well as the second locking element 12 on a plateau 19 the locking link 10 issue. Will the center lock function of the hydraulic camshaft adjuster 1 activated, then the rotor 3 rotated by the alternating moments with the camshaft in the direction of the center position. In this case, the second locking element decreases 12 in an adjustment step II in the locking frame 10 and lies on a heel of the middle stage 20 the locking link 10 at. By the stop 22 in the direction of "early" turning back counter to the desired adjustment by the second locking element 12 blocked. Will the rotor 3 rotated by the alternating torques of the camshaft further in the direction of the center position, the second locking element decreases 12 in an adjustment step III to the bottom 21 the locking link 10 while the first locking element 11 continue on the plateau 19 the locking link 10 rests. In this case, a rotation against the desired adjustment in the direction of the center position is locked by the fact that the second locking element 12 on a stop surface 24 which is the reason 21 bounded in the lateral direction. In a further adjustment step IV the first locking element sinks 11 to the middle level 20 the locking link 10 while the second locking element 12 in a middle position at the bottom 21 the locking link 10 is turned. The blocking effect against the desired adjustment results in this adjustment step IV by the concern of the first locking element 11 at the stop 22 on the middle stage 20 the locking link 10 , In a final adjustment step, the first locking element also sinks 11 to the bottom 21 the locking link 10 from. This is the rotor 3 in this in 2 locked position shown, as by the concerns of the first locking element 11 at the stop surface 24 and by the abutment of the second locking element 12 at the stop surface 25 both a rotation in the direction of "early" and a rotation in the direction of "late" is locked. To the rotor 3 To unlock, the locking link can 10 , especially the reason 21 the locking link 10 , hydraulically pressurized, causing the locking elements 11 . 12 against the force of the springs in the rotor 3 be inserted and thus a rotation of the rotor 3 release.

In 4 is another embodiment of a locking process of a rotor 3 in a hydraulic camshaft adjuster according to the invention 1 shown. In the illustrated starting position I is the rotor 3 of the hydraulic camshaft adjuster 1 adjusted in the direction of "late". Should the rotor 3 Now be rotated from this adjustment position in the center position and locked there, a successive locking process. In the initial situation I is the rotor 3 so far from the center position in the direction of "early" twisted that both the first locking element 11 as well as the second locking element 12 on a plateau 19 the locking link 10 issue. Will the center lock function of the hydraulic camshaft adjuster 1 activated, then the rotor 3 rotated by the alternating moments with the camshaft in the direction of the center position. In this case, the first locking element decreases 11 in an adjustment step II in the locking frame 10 and lies on a heel of the middle stage 20 the locking link 10 at. By the stop 23 in the direction of "early" turning back counter to the desired adjustment by the second locking element 12 blocked. Will the rotor 3 rotated by the alternating torques of the camshaft further in the direction of the center position, the first locking element decreases 11 in an adjustment step III to the bottom 21 the locking link 10 while the second locking element 12 continue on the plateau 19 the locking link 10 rests. In this case, a rotation against the desired adjustment in the direction of the center position is locked by the fact that the first locking element 11 on a stop surface 25 which is the reason 21 bounded in the lateral direction. In a further adjustment step IV and the second locking element decreases 12 to the middle level 20 the locking link 10 while the first locking element 11 in a middle position at the bottom 21 the locking link 10 is turned. The blocking effect against the desired adjustment results in this adjustment step IV by the abutment of the second locking element 12 at the stop 23 on the middle stage 20 the locking link 10 , In a final adjustment step, the second locking element also sinks 12 to the bottom 21 the locking link 10 from. This is the rotor 3 in this in 2 locked position shown, as by the concerns of the first locking element 11 at the stop surface 24 and by the abutment of the second locking element 12 at the stop surface 25 both a rotation in the direction of "early" and a rotation in the direction of "late" is locked. To the rotor 3 To unlock, the locking link can 10 , especially the reason 21 the locking link 10 , hydraulically pressurized, causing the locking elements 11 . 12 against the force of the springs in the rotor 3 be inserted and thus a rotation of the rotor 3 release.

In 5 is a rotor 3 for a hydraulic camshaft adjuster according to the invention 1 shown. The rotor 3 has a rotor hub 16 on, from which four wings in the radial direction 5 protrude. There is one of these wings 5 as a locking wing 35 formed and has a recess 27 for the second locking element 12 of the hydraulic camshaft adjuster 1 on. On the rotor 3 is in the transition area between the locking wing 35 and the rotor hub 16 a second recess 26 formed, which for receiving the first locking element 11 serves. Furthermore, the rotor has 3 a plurality of oil supply channels 33 . 34 . 36 on, with a first group of supply channels 33 the central opening with the first working chambers 7 and a second group of supply channels 24 the central opening with the second working chambers 8th combines. A third group of supply channels 36 finally connects the central opening with the control chamber 9 , In the wings 5 which do not serve as a locking wing 35 are executed, each is a groove 37 introduced for receiving a sealing element, which in each case the first working chambers 7 hydraulically from the second working chambers 8th separates.

In summary, it can be stated that in a hydraulic camshaft adjuster according to the invention 1 a lock of the two locking elements 11 . 12 in a common locking frame 10 is possible. Thus, the manufacturing costs for the locking lid 13 as well as for the rotor 3 be lowered because no oblique holes on the rotor 3 are necessary and the locking element in the circumferential direction can be arranged according to each other closely, so that the required space can be reduced compared to known solutions.

LIST OF REFERENCE NUMBERS

1

hydraulic camshaft adjuster

2

stator

3

rotor

4

web

5

wing

6

working space

7

First working chamber

8th

Second working chamber

9

control chamber

10

locking link

11

first locking element

12

second locking element

13

locking cover

14

First cover part

15

Second cover part

16

rotor hub

17

First ray

18

Second ray

19

Plateau of the locking gate

20

middle level of the locking link

21

Reason for the locking mechanism

22

Stop surface (in the direction of "early")

23

Stop surface (towards "late")

24

Stop surface (in the direction of "early")

25

Stop surface (towards "late")

26

Recess for the first locking element

27

Recess for second locking element

28

Rotation axis / central axis

29

Center of the first locking element

30

Center of the second locking element

31

bisecting

32

screw

33

Supply channel first working chamber

34

Supply channel second working chamber

35

locking wings

36

Supply channel control chamber

37

groove

38

driving teeth

D ₁

Diameter of the first locking element

D ₂

Diameter of the second locking element

α

Angle between the rays

β

bisecting

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10217062 A1 [0004]

Claims (10)

Hydraulic camshaft adjuster (1) for variably adjusting the timing of gas exchange valves of an internal combustion engine, comprising - a stator (2) and a rotatable relative to the stator (2) rotor (3), -, on the stator (2) radially inwardly projecting webs (4) are formed, wherein, - on the rotor (3) radially outwardly projecting wings (5, 35) are formed, wherein - formed between the stator (2) and the rotor (3) a plurality of hydraulic working spaces (6) are each divided by a wing (5, 35) of the rotor (3) in a first working chamber (7) and a second working chamber (8), and wherein - in the rotor (3) has two locking elements (11, 12) for locking the rotor (3) relative to the stator (2) are inserted in a central position, characterized in that the first locking element (11) and the second locking element (12) in a common locking link (10) are lockable, wherein - Center point (29) of the first interlocking member (11) is at a different circle diameter about a central axis (28) of the hydraulic phaser (1) than the midpoint (30) of the second interlocking member (12), and wherein a first beam (17) intersects the central axis (28) of hydraulic camshaft adjuster (1) with the first center (29) and a second beam (18) connecting the central axis (28) with the second center (30), wherein - the first beam (17) and the second beam (18) at an angle (α). Hydraulic camshaft adjuster (1) to Claim 1 , characterized in that - the second locking element (12) substantially in a wing (5, 35) of the rotor (3) and the first locking element (11) substantially in a rotor hub (16) of the rotor (3) or in the transition region between the vanes (5, 35) of the rotor (3) and the rotor hub (16) are arranged. Hydraulic camshaft adjuster (1) to Claim 1 or 2 , characterized in that - in addition to the working chambers (7, 8) a control chamber (9) is present, wherein - the rotor segment with the locking elements (11, 12) in the control chamber (9) is arranged. Hydraulic camshaft adjuster (1) according to one of Claims 1 to 3 , characterized in that - the locking link (10) is designed as a stepped locking link, wherein the locking link (10) has at least one base (21), a middle step (20) and a plateau (19), wherein - the middle step ( 20) between the base (21) and the plateau (19) is formed. Hydraulic camshaft adjuster (1) to Claim 4 , characterized in that - both the first locking element (11) and the second locking element (12) abut the base (21) of the locking link (10) when the rotor (3) is locked in a central position. Hydraulic camshaft adjuster (1) according to one of Claims 1 to 5 , characterized in that - the locking link (10) in a locking cover (13) of the hydraulic camshaft adjuster (1) is formed which limits the stator (2) and the rotor (3) in the axial direction. Hydraulic camshaft adjuster (1) to Claim 6 , characterized in that - the locking cover (13) is designed as a multi-part cover with a first cover part (14) and a second cover part (15), wherein - the first cover part (14) and the second cover part (15) are arranged concentrically to one another , Hydraulic camshaft adjuster (1) according to one of Claims 1 to 7 , characterized in that - an angle bisector (31) of the angle (α) between the two beams (17, 18) intersects both the first locking element (11) and the second locking element (12). Hydraulic camshaft adjuster (1) according to one of Claims 1 to 8th , characterized in that - the rotor (3) is designed free of oblique holes. Method for locking a rotor of a hydraulic camshaft adjuster (1) according to one of Claims 1 to 9 , characterized in that - the locking elements (11, 12) upon rotation of the rotor (3) from an adjustment position in the center position successively penetrate into the locking link (10), whereby a rotation of the rotor (3) in the direction of the center position possible and a rotation of the rotor (3) is locked against the rotation in the center position.

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