DE102014001397A1 - Camshaft adjusting device - Google Patents

Abstract

The invention relates to a camshaft adjusting device for an internal combustion engine of a motor vehicle, having an actuating mechanism (10a, 10b) provided with an adjustment of a camshaft phase position, which has an actuating element (11a, 11b) with an electromechanical brake unit (12a, 12b) in at least one Operating mode is provided for the adjustment of the camshaft phase position with a braking torque acting on the actuating element (11a, 11b), and with an actuator (13a, 13b), which is intended to operate in at least one operating mode, the brake unit (12a, 12b) in that the camshaft adjusting device has a locking unit (14a, 14b) which can be actuated by the actuators (13a, 13b) and which is provided to lock the adjusting element (11a, 11b) in at least one angular position.

Description

The invention relates to a camshaft adjusting device for an internal combustion engine of a motor vehicle.

There are already known Nockenwellenverstellvorrichtungen for internal combustion engines of a motor vehicle, which provided for an adjustment of a camshaft phase position control gear with an actuating element, an electromechanical brake unit, which is intended to influence the adjustment of the camshaft phase position with a braking torque on the actuator, and an actuator that the is provided, the brake unit to operate, have.

The invention is in particular the object of cost to reduce fuel consumption of the internal combustion engine. This object is achieved by an inventive design of the camshaft adjusting device according to claim 1. Further developments of the invention will become apparent from the dependent claims.

The invention relates to a camshaft adjusting device for an internal combustion engine of a motor vehicle, with an actuating mechanism provided for adjusting a camshaft phase position having an actuating element with an electromechanical brake unit provided in at least one operating mode for adjusting the camshaft phase position with a braking torque to act on the actuator, and with an actuator, which is intended to operate in at least one operating mode, the brake unit.

It is proposed that the camshaft adjusting device has an actuatable by the actuator lock unit, which is intended to lock the actuator in at least one angular position. By means of the locking unit, the actuating element can be held in at least one preferred angular position independently of the brake unit, whereby at least one defined and in particular preferred camshaft phase position is locked and thereby a power loss resulting from the braking torque can be at least reduced. By using the actuator provided for actuation of the brake unit can be dispensed with an additional provided for actuating the locking unit actuators, whereby the locking of at least one defined and particularly preferred camshaft phase position can be particularly space, weight and cost savings realized. By locking the at least one defined and in particular preferred camshaft phase position, an efficiency and a control quality, in particular during the locked camshaft phase position, can be increased, as a result of which optimized-efficiency operating states of the internal combustion engine can be provided. By means of the camshaft adjusting device, fuel consumption of the internal combustion engine can be reduced cost-effectively, as a result of which a particularly environmentally friendly internal combustion engine can be provided. By "provided" is intended to be understood in particular specially programmed, designed, designed, equipped and / or arranged.

It is further proposed that the actuator system is provided for activating the locking unit for locking the at least one angular position in at least one operating mode and / or for deactivating the at least one angular position. As a result, the actuator system, which is provided for actuating the brake unit and for actuating the locking unit, can be made particularly simple, as a result of which costs can be further saved.

It is advantageous if the actuator system is provided as a function of at least one brake actuation parameter for providing the braking torque or for actuating the locking unit, whereby it is particularly advantageous to switch between the provision of the braking torque and the actuation of the locking unit. In particular, by switching between brake actuation parameters and / or brake actuation parameter values, in addition to providing the braking torque, at least one additional actuation degree of freedom can be provided, which can be used to actuate the locking unit. A "brake actuation parameter" is to be understood, in particular, as meaning a parameter that can be set by a control and / or regulating unit, by which an actuation of the brake unit is at least partially defined. The brake actuation parameter is preferably designed as an actuation direction, an actuation stroke or the like, which can be adjusted, in particular, by current supply to the actuators that can be adjusted by the control and / or regulating unit, preferably by a current application direction, an energization intensity or the like. In principle, the at least one actuation degree of freedom can also be used elsewhere, for example to provide a drive torque for adjusting the camshaft phase position when the internal combustion engine is inactive.

It is also proposed that the actuators have a first actuating direction for providing the braking torque and a second actuating direction for actuating the locking unit, which is directed counter to the first actuating direction. This can be realized that the Actuator depending on the direction of actuation and thus the Bestromungsrichtung is used either to provide the braking torque or to actuate the locking unit, whereby the camshaft adjusting device can be optimized without a high overhead. An "actuating direction" is to be understood in particular as meaning a direction of movement of at least one actuator of the actuator system predetermined by the direction of energization of a coil of the actuator system. Preferably, the first actuating direction for closing the brake unit and the second actuating direction for opening the brake unit is provided.

In an alternative embodiment, it is particularly advantageous if the actuator system has a first actuating stroke for providing the braking torque and a second actuating stroke, which differs from the first actuating stroke, for actuating the locking unit. It can thereby be realized that the locking unit is actuated by an extended actuating stroke of the actuator, whereby an alternative embodiment of the locking unit can be provided. An "actuating stroke" is to be understood in particular as a movement path of the actuator along an actuating direction. Preferably, the two mutually different actuating strokes are directed in an identical direction of actuation. In principle, it is conceivable to provide further actuator degrees of freedom by a combination of the dependence on the actuating direction and the dependence of the actuating stroke, as a result of which the camshaft adjusting device can be further optimized. For example, the actuator system can have a first actuating stroke in a first actuating direction for providing the braking torque, a second actuating stroke differing from the first actuating stroke in the first actuating direction for actuating the locking unit, and a second actuating direction opposing the first actuating direction for providing the drive torque for adjusting the camshaft phase position exhibit.

Preferably, the brake unit has at least one brake pad provided for providing the brake torque, which is resiliently connected to the actuator system. As a result, the dependence on at least two actuating strokes can be realized structurally simple.

Further, it is advantageous if the brake unit has at least one rotatably connected to the actuator brake disc and the locking unit is provided to lock the brake disc in at least one angular position, whereby the actuator braked by means of the brake disc for adjusting the camshaft phase position and to lock the at least one Angle position can be locked.

Further, it is advantageous if the brake disc and the locking unit each have a locking contour, which are designed to form-fit locking corresponding to each other, whereby the at least one angular position can be reliably held.

Particularly preferably, the locking contour of the brake disc at least one locking recess and the locking contour of the locking unit at least one locking pin which is intended to interlock positively for locking the at least one angular position of the actuating element in the at least one locking recess in the circumferential direction. As a result, the interlocking locking can be realized structurally simple.

Furthermore, it is proposed that the camshaft adjusting device has a control technology connected to the actuators control and / or regulating unit, which is intended to open the brake unit during a locked actuating element. Thereby can be avoided during defined and in particular preferred camshaft phase positions by dispensing with the provision of the braking torque acting on the actuating element, a loss performance, whereby the efficiency can be increased. A "control and / or regulating unit" is to be understood in particular as a unit having at least one control unit. A "control unit" is to be understood as meaning, in particular, a unit having a processor unit and a memory unit as well as an operating program stored in the memory unit. In principle, the control and / or regulating unit can have a plurality of interconnected control units, which are preferably provided to communicate with one another via a bus system, in particular a CAN bus system.

Advantageously, the control and / or regulating unit is provided to control the actuators for actuating the locking unit during a braking torque control operation of the brake unit provided for adjusting the camshaft phase position, whereby camshaft phasing can be locked in advantageous operating states of the internal combustion engine. A braking torque control operation is to be understood as meaning, in particular, an operation of the brake unit in which the braking torque for adjusting and / or maintaining the camshaft phase position is regulated.

Furthermore, it is advantageous if the control and / or regulating unit is provided to actuate the actuators for actuating the locking unit as a function of at least one camshaft parameter. As a result, the actuation of the locking unit and thus the locking or unlocking of the at least one defined and in particular preferred camshaft phase position can be optimally adapted to a currently present camshaft phase position, whereby an optimal time for actuating the locking unit can be found.

Further advantages will become apparent from the following description of the figures. In the figures, two embodiments of the invention are shown. The figures, the description of the figures and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Showing:

1 highly schematic of a camshaft adjusting device of an internal combustion engine of a motor vehicle and

2 highly schematically an alternatively formed camshaft adjusting an internal combustion engine of a motor vehicle.

1 shows a highly schematic part of an internal combustion engine of a motor vehicle. The internal combustion engine has a crankshaft, not shown, which rotates about its axis of rotation when the internal combustion engine is running. For actuating gas exchange valves of the internal combustion engine, not shown, the internal combustion engine has a camshaft 21a on, with the internal combustion engine running around its axis of rotation 22a rotates. The camshaft 21a is drivingly connected to the crankshaft, causing the camshaft 21a is driven by the crankshaft.

To increase the efficiency, the internal combustion engine has a camshaft adjusting device, which is provided for adaptation of Gasventilöffnungs- and / or Gaswechselschließzeiten while the internal combustion engine. The camshaft adjusting device has a control gear 10a on that the crankshaft and the camshaft 21a in terms of drive technology. For drive connection to the crankshaft has the actuating gear 10a a drive wheel 23a on. The drive wheel 23a has an external toothing.

The internal combustion engine has the drive connection of the actuating gear 10a to the crankshaft not shown in detail endless belt means, which is a torque between the drive wheel 23a and the crankshaft transmits. The wrapping means is formed as a chain. The drive wheel 23a is designed as a sprocket. In principle, the belt can also be used as a belt and the drive wheel 23a be designed as a pulley.

For the drive connection to the camshaft 21a has the actuating gear 10a a driven wheel 24a on, the rotation with the camshaft 21a connected is. The driven wheel 24a is formed as a ring gear. It is radially inside the drive wheel 23a arranged. For torque transmission between the drive wheel 23a and the output gear 24a has the actuating gear 10a several planet wheels 25a on, the meshing with the output gear 24a are connected. For meshing connection between the output gear 24a and the planet wheels 25a has the output gear 24a an internal toothing and the planet gears 25a each have an external toothing. For receiving the planet wheels 25a has the actuating gear 10a a planet carrier 26a on, the planetary gears 25a each rotatably receives. The planet carrier 26a is non-rotatable with the drive wheel 23a connected, causing the crankshaft via the drive wheel 23a the planet carrier 26a and with it the planet wheels 25a drives.

To adjust a camshaft phase position and thus to adapt the Gasventilöffnungs- and / or Gaswechselschließzeiten, the actuating gear 10a an actuator 11a on. The actuator 11a is meshing with the planet wheels 25a connected. For this purpose, the actuator 11a an external toothing on. The planet wheels 25a are in the radial outward direction with the output gear 24a and in the radial direction inwardly with the actuator 11a combing connected. The planet carrier 26a leads the planet wheels 25a on a circular path around the actuator 11a , The actuator 11a is designed as a sun gear. The actuating gear 10a is designed as a planetary gear.

In order to provide an actuating force when the internal combustion engine is active, ie when the internal combustion engine is running, the camshaft adjusting device has an electromechanical brake unit 12a on, for adjusting the camshaft phasing with a braking torque on the actuator 11a acts. The brake unit 12a has a brake pad for providing the braking torque 27a and a brake disc 17a on, which are intended to contact each other directly to generate the braking torque. The brake unit 12a is designed as a Reibbelagsbremse. The active internal combustion engine is through a crankshaft speed not equal to zero.

For acting on the actuator 11a is the brake disc 17a rotationally fixed with the actuator 11a connected. To connect the brake disc 17a with the actuator 11a has the actuating gear 10a a control shaft 28a on. The control shaft 28a extends from the actuator 11a axially in the direction of the brake disc 17a , It is non-rotatable with the actuator 11a and rotatably with the brake disc 17a connected. The brake disc 17a is on the control shaft 28a molded. The control shaft 28a is designed as a sun wave.

For actuating the brake unit 12a the camshaft adjusting device has an actuator system 13a on, which is a first direction of actuation 15a and one to the first direction of actuation 15a opposite second actuating direction 16a having. The actuators 13a is in the first direction of actuation 15a and in the second direction of actuation 16a controllable. The first direction of actuation 15a is to close the brake unit 12a and the second operating direction 16a for opening the brake unit 12a intended. The actuators 13a has an actor 29a on, the magnetically in both directions of actuation 15a . 16a is axially movable. The actor 29a is firmly on the brake pad 27a tethered. He is at one of the brake discs 17a opposite side of the brake pad 27a tethered. For the axial movement of the actuator 29a and thus the brake pad 27a assigns the actuators 13a a coil 30a on, which can be energized in two directions of energization. Depending on the direction of current supply of the coil 30a results in the corresponding actuation direction 15a . 16a ,

To a preferred angular position of the actuating element 11a and to lock a preferred camshaft phasing, the camshaft phasing device has a locking unit 14a on, which is intended, in its activated state, the actuator 11a to hold in the preferred angular position. In a locked state of the actuating element 11a prevents the locking unit 14a a rotation of the actuating element 11a , The locking unit 14a is actuarial to the actuators 13a connected and thus also by the actuators 13a actuated.

The locking unit 14a includes an activated state in which the locking unit 14a the actuator 11a locked in the preferred angular position or to lock the actuator 11a is prepared in the preferred angular position, and a deactivated state in which the locking unit 14a the actuator 11a unlocked. The actuators 13a is intended to the locking unit 14a between their activated state and their deactivated state. It is intended to the locking unit 14a to activate the locking of the preferred angular position and to disable the unlocking of the preferred angular position. The actuators 13a is thus to actuate the brake unit 12a and for actuating the locking unit 14a intended.

For locking the control element 11a locks the locking unit 14a the brake disc 17a positive fit in a corresponding angular position. For this purpose, the locking unit 14a a locking contour 18a and the brake disc 17a a locking contour 19a , which are designed for positive locking corresponding to each other, on. In the locked state of the actuating element 11a grips the locking contour 18a in the corresponding locking contour 19a in a circumferential direction of the brake disk 17a a positive fit. The locking contour 18a has several locking pins 31a and the locking contour 19a several locking recesses 32a on. In the locked state of the actuating element 11a grab the locking pins 31a in the locking recesses 32a in the circumferential direction of the brake disc 17a a form-fitting, whereby the actuator 11a is positively locked in the preferred angular position.

The actuators 13a is either a function of a brake actuation parameter for providing the braking torque or for actuating the locking unit 14a intended. Here is the actuators 13a in the stroke movement in the first direction of actuation 15a for providing the braking torque and during the lifting movement in the first actuating direction 15a opposite second actuating direction 16a for actuating the locking unit 14a intended. The actuators 13a is to provide the braking torque in the first direction of actuation 15a and for actuating the locking unit 14a in the second direction of actuation 16a controllable.

To activate and deactivate the locking contours 18a . 19a has the locking unit 14a an actuating mechanism 33a on. The actuating mechanism 33a is in the 1 for the sake of clarity only shown schematically. The actuating mechanism 33a couples the actuator 29a with the locking contour 18a in style, so that the lifting movement of the actuator 29a in the second direction of actuation 16a Activation or deactivation of the locking unit 14a causes. The actuating mechanism 33a converts the stroke movement of the actuator 29a in an activation movement of the locking contour 18a and a deactivation movement of the locking contour 18a around. Through the activation movement of the locking contour 18a goes the locking unit 14a from the deactivated state to the activated one Condition over, reducing the locking contours 18a . 19a with appropriate relative rotation to each other form-fit engage each other and the actuator 11a lock. By the deactivation movement of the locking contour 18a goes the locking unit 14a from the activated state to the deactivated state, whereby the locking contour 18a out of the locking contour 19a moves and the positive connection between the locking contours 18a . 19a solves.

The stroke movement of the actuator 29a that the operating mechanism 33a the locking unit 14a in the activation movement and in the deactivation movement of the locking contour 18a converts, is in the second direction of actuation 16a directed. The stroke movement of the actuator 29a that the operating mechanism 33a the locking unit 14a in the activation movement and in the deactivation movement of the locking contour 18a converts, is to open the brake unit 12a intended. Thus, the brake unit becomes 12a for actuating the locking unit 14a open for a short time.

For controlling and regulating the camshaft adjusting device has a control technology to the actuators 13a connected control unit 20a on, which for adjusting the camshaft phase position with the internal combustion engine, the actuators 13a in the first direction of actuation 15a and for actuating the locking unit 14a the actuators 13a in the second direction of actuation 16a controls. For adjusting the camshaft phase position while the internal combustion engine is running controls the control unit 20a in a Bremsmomentregelbetrieb the actuators 13a continuously in the first direction of actuation 15a and thereby regulates that on the brake disc 17a acting braking torque. For actuating the locking unit 14a controls the control unit 20a the actuators 13a short-term or pulsed in the second direction of actuation 16a and thereby generates a short stroke movement of the actuator 29a in the second direction of actuation 16a , causing the locking unit 14a is activated or deactivated.

In the locked state of the actuating element 11a and thus in a condition in which the locking contour 18a into the locking contour 19a positively engages, opens the control unit 20a the brake unit 12a , resulting in a provision of one on the actuator 11a acting braking torque during the locked actuator 11a is waived. In the locked state of the actuating element 11a is the angular position and thus the camshaft phase position only by the locking unit 14a maintained. In the locked state of the actuating element 11a is missing the brake pad 27a and the brake disc 17a a mutually rubbing contact between each other.

For controlling the actuators 13a energises the control unit 20a the sink 30a in the appropriate, the desired direction of actuation 15a . 16a assigned Bestromungsrichtung. The control unit closes in one of the energizing directions 20a the brake unit 12a to control the adjustment of the camshaft phasing by the braking torque control. In the other Bestromungsrichtung opens the control unit 20a the brake unit 12a to the locking unit 14a to press. The control unit 20a changes to actuation of the locking unit 14a briefly the energization direction. It energizes the coil 30a during braking torque control in the second operating direction 16a pulse-like and thereby provides a short stroke movement of the actuator 29a in the second direction of actuation 16a one through the operating mechanism 33a the locking unit 14a in the activation movement or in the deactivation movement of the locking contour 18a is converted. When the actuator 11a is locked, opens the control unit 20a the brake unit 12a , To between the adjustment of the camshaft phasing by means of the braking torque and the operation of the locking unit 14a to change, changes the control unit 20a the activation of the actuators 13a with regard to the direction of energization.

To the operation of the locking unit 14a to perform in phase, controls the control unit 20a the actuators 13a for actuating the locking unit 14a depending on a camshaft parameter. For this purpose, the camshaft adjusting device to a camshaft sensor, not shown, with which the control unit 20a is communicatively connected. In response to camshaft signals detected by the camshaft sensor, the control unit controls 20a the actuators 13a for actuating the locking unit 14a at. The camshaft parameter is designed as an actual camshaft phasing.

In the 2 a further embodiment of the invention is shown. The following description is essentially limited to the differences between the exemplary embodiments, wherein, with regard to components, features and functions that remain the same, in particular the description of the exemplary embodiment of FIGS 1 can be referenced. To distinguish the embodiments, the letter a in the reference numerals of the embodiment of 1 by the letter b in the reference numerals of the embodiment of 2 replaced. Regarding the same Designated components, in particular with respect to components with the same reference numerals, in principle, on the drawing and / or the description of the embodiment of 1 to get expelled.

2 shows a highly schematic of an alternately formed camshaft adjusting device of an internal combustion engine of a motor vehicle. The camshaft adjusting device has a control gear 10b with an actuator 11b and an electromechanical brake unit 12b , which is used to adjust a camshaft phasing with a braking torque on the actuator 11b acts on. Furthermore, the camshaft adjusting device has a locking unit 14b on, which is used to lock the actuator 11b is provided in an angular position. To with the braking torque on the actuator 11b interact and the actuator 11b to lock, the brake unit indicates 12b a brake disc 17b with a locking contour 19b on, which corresponds to a locking contour 18a the locking unit 14b is trained. For actuating the brake unit 12b and the locking unit 14b the camshaft adjusting device has an actuator system 13b on. To provide the braking torque, the brake unit 12b also a brake pad 27b on, the movement technology with the actuators 13b is coupled. For controlling the actuators 13b the camshaft adjusting device has a control technology to the actuators 13b connected control unit 20b on.

In contrast to the previous embodiment, the actuators 13b a first actuating stroke for providing the braking torque and a second actuating stroke, which differs from the first actuating stroke, for actuating the locking unit 14b on. The second actuating stroke is greater than the first actuating stroke. The two actuating strokes are both in a first actuating direction 15b directed. The first direction of actuation 15b is to close the brake unit 12b intended. A stroke movement of an actuator 29b the actuators 13b with the second actuating stroke is greater than the stroke movement of the actuator 29b with the first actuation stroke. The actuators 13b is intended to the locking unit 14b with an extended lifting movement in to close the brake unit 12b intended actuation direction 15b to press.

An actuating mechanism 33b the locking unit 14b converts a stroke movement of the first actuating stroke in the second actuating stroke in an activation movement or in a deactivation movement of the locking contour 18b around. The actuators 13b is in the stroke movement in the first direction of actuation 15b with the first actuating stroke for providing the braking torque and during the lifting movement in the first actuating direction 15b from the first actuating stroke to the second actuating stroke for actuating the locking unit 14b intended. The stroke movement from the first actuating stroke into the second actuating stroke forms the extended stroke movement.

To realize the two different operating strokes is the brake pad 27b springy on the actuator 13b tethered. The brake pad 27b is springy with the actuator 29b connected. The actuators 13b has a spring element 34b on, the effectively between the actor 29b and the brake pad 27b is arranged. The actor 29b is on one of the brake discs 17b opposite side of the brake pad 27b springy tailed. From a defined feed force of the actuator 29b in the direction of the brake disc 17b gives the spring element 34b after and the actor 29b moves in the direction of the brake disc 17b from the first actuating stroke to the second actuating stroke. This lifting movement from the first operating stroke to the second operating stroke converts the actuating mechanism 33b the locking unit 14b in the activation movement or in the deactivation movement of the locking contour 18b around.

For actuating the locking unit 14b controls the control unit 20b the actuators 13b in the first direction of actuation 15b the spring element 34b overwhelming for a short time. For adjusting the camshaft phase position while the internal combustion engine is running controls the control unit 20b the actuators 13b in the first direction of actuation 15b without the actuator 29b the spring element 34b overdriven and moves into the second actuating stroke. To between the adjustment of the camshaft phasing by means of the braking torque and the operation of the locking unit 14b to change, changes the control unit 20b the activation of the actuators 13b in terms of a current intensity.

LIST OF REFERENCE NUMBERS

10

actuating mechanism

11

actuator

12

brake unit

13

actuators

14

locking unit

15

operating direction

16

operating direction

17

brake disc

18

locking profile

19

locking profile

20

Control unit

21

camshaft

22

axis of rotation

23

drive wheel

24

output gear

25

planet

26

planet

27

brake lining

28

actuating shaft

29

actuator

30

Kitchen sink

31

locking pin

32

locking recess

33

actuating mechanism

34

spring element

Claims (10)

Camshaft adjusting device for an internal combustion engine of a motor vehicle, having an actuating mechanism provided for adjusting a camshaft phase position (US Pat. 10a ; 10b ), which is an actuating element ( 11a ; 11b ), with an electromechanical brake unit ( 12a ; 12b ), which is provided in at least one operating mode, for adjusting the camshaft phase position with a braking torque on the actuator ( 11a . 11b ) and with an actuator ( 13a ; 13b ), which is provided in at least one operating mode, the brake unit ( 12a ; 12b ), characterized by a through the Aktorik ( 13a ; 13b ) actuatable locking unit ( 14a ; 14b ), which is intended to control the actuator ( 11a ; 11b ) in at least one angular position. Camshaft adjusting device according to claim 1, characterized in that the actuators ( 13a ; 13b ) is provided in at least one operating mode, the locking unit ( 14a ; 14b ) to lock the at least one angular position to activate and / or to unlock the at least one angular position. Camshaft adjusting device according to claim 1 or 2, characterized in that the actuators ( 13a ; 13b ) in dependence on at least one brake actuation parameter for providing the braking torque or for actuating the locking unit ( 14a ; 14b ) is provided. Camshaft adjusting device according to one of the preceding claims, characterized in that the actuators ( 13a ) a first actuating direction ( 15a ) for providing the braking torque and one of the first actuating direction ( 15a ) opposing second actuating direction ( 16a ) for actuating the locking unit ( 14a ) having. Camshaft adjusting device according to one of claims 1 to 3, characterized in that the actuators ( 13b ) a first actuating stroke for providing the braking torque and a second actuating stroke, which differs from the first actuating stroke, for actuating the locking unit ( 14b ) having. Camshaft adjusting device according to one of the preceding claims, characterized in that the brake unit ( 12b ) at least one provided for providing the braking torque brake pad ( 27b ), the spring on the actuator ( 13b ) is attached. Camshaft adjusting device according to one of the preceding claims, characterized in that the brake unit ( 12a ; 12b ) at least one rotationally fixed with the adjusting element ( 11a ; 11b ) connected brake disc ( 17a ; 17b ) and the locking unit ( 14a ; 14b ) is provided, the brake disc ( 17a ; 17b ) in at least one angular position. Camshaft adjusting device according to claim 7, characterized in that the brake disc ( 17a ; 17b ) and the locking unit ( 14a ; 14b ) each have a locking contour ( 18a . 19a ; 18b . 19b ), which are designed for positive locking corresponding to each other. Camshaft adjusting device according to one of the preceding claims, characterized by a control technology to the actuators ( 13a ; 13b ) connected control and / or regulating unit ( 20a ; 20b ), which is intended, during a locked actuating element ( 11a ; 11b ) the brake unit ( 12a ; 12b ) to open. Camshaft adjusting device according to claim 9, characterized in that the control and / or regulating unit ( 20a ; 20b ) is intended, the Aktorik ( 13a ; 13b ) for actuating the locking unit ( 14a ; 14b ) in response to at least one camshaft parameter.

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