EP1596040A2 - Camshaft phaser - Google Patents

Abstract

The plate has a drive wheel (2), propelled by a crankshaft. A cam shaft-firm drive output (3) is connected to the cam shaft. The drive wheel is propelled over a hydraulic control drive. The control drive is from a pair of hydraulic pressure chambers working against each other (12, 13). The pressure chambers are arranged over a distributor (14). The cam shaft together with a cylinder head construction unit (55) has a cam shaft axial-thrust bearing.

Description

The invention relates to a camshaft adjuster for adjustment and fixation the phase position of a camshaft of an internal combustion engine opposite a phase angle of the crankshaft with a driven by the crankshaft Drive wheel, a camshaft fixed output part, the at a Camshaft or an extension of the camshaft is attached and the is driven by the drive wheel via a hydraulic actuator, wherein the actuator from at least one pair working against each other consists of hydraulic pressure chambers and wherein the pressure chambers via a Pressure medium distributor and pressure medium lines are supplied with pressure medium.

In internal combustion engines, camshafts are used to actuate the gas exchange valves used. The camshaft is such in the internal combustion engine attached to the cam attached to cam followers, for example Cup tappets, drag levers or rocker arms, abut. Will the Camshaft set in rotation, so roll the cams on the cam followers off, in turn, actuate the gas exchange valves. By the location and the shape of the cams is thus both the opening duration and amplitude but also the opening and closing time of the gas exchange valves set.

Modern engine concepts go to design the valve train variable. On the one hand, valve lift and valve opening duration should be variable, up to the complete shutdown of individual cylinders. For that are concepts like switchable cam followers or electro-hydraulic or electric valve actuators intended. Furthermore, it has proved to be advantageous while the operation of the internal combustion engine affects the opening and Closing times of the gas exchange valves to take. Also desirable it is on the opening or closing times of the inlet or Separate valves to be able to influence separately, for example, targeted to be able to set a defined valve overlap. Through the targeted Setting the opening and closing times of the gas exchange valves dependent from the current engine map of the engine, for example, the current Speed or the current load, the specific fuel consumption lowered, the exhaust gas behavior positively influenced, the engine efficiency, the maximum torque and the maximum power are increased.

The variability described in the gas exchange valve timing is by a relative change in the phase angle of the camshaft to the crankshaft accomplished. The camshaft is usually a chain, belt, or gear drive in direct drive connection with the crankshaft. Between the crankshaft driven chain, belt or gear drive and the camshaft, a camshaft adjuster is mounted, which the Transmitting torque from the crankshaft to the camshaft. It is this Device designed such that during operation of the internal combustion engine the phase angle between crankshaft and camshaft held securely and, if desired, the camshaft in a certain angular range can be rotated relative to the crankshaft.

In internal combustion engines, each with a camshaft for the intake and the exhaust valves These can be equipped with a camshaft adjuster. This allows the opening and closing times of the inlet and outlet gas exchange valves time shifted relative to each other and the Ventilzeitüberschneidungen be targeted.

The seat of modern camshaft adjuster is generally located on drive end of the camshaft. It consists of a crankshaft-resistant Drive wheel, a camshaft fixed output part and a torque from the drive wheel on the driven part transmitted adjusting mechanism. The drive wheel can be designed as a chain, belt or gear be and is by means of a chain, a belt or a gear drive with the crankshaft rotatably connected. The adjustment mechanism can be electrical, operated hydraulically or pneumatically.

In the hydraulically operated camshaft adjusters one differentiates so-called Axialkolbenversteller and Rotationskolbenversteller.

In the Axialkolbenverstellern the drive wheel is over with a piston a helical gear in conjunction. Furthermore, the piston is with the Stripping part also via a helical gear in conjunction. The piston separates a cavity formed by the driven part and the drive wheel two axially mutually arranged pressure chambers. Will now be the one pressure chamber pressurized with a hydraulic medium while the other pressure chamber connected to an oil outlet, the piston moves in axial direction. This axial displacement effected by means of the two helical gears a relative rotation of the drive wheel to the output part and thus the camshaft to the crankshaft.

In a rotary piston adjuster, the drive wheel is non-rotatable with a stator connected. The stator and the output part are concentric with each other arranged. The radial gap between these two components takes at least one, but usually several, spaced in the circumferential direction Cavities up. The cavities are in the axial direction through Side walls pressure-tight limited. In each of these cavities extends Wing connected to the stripping section. This wing divides each cavity into two pressure chambers. By targeted connection of the individual pressure chambers with a hydraulic fluid pump or with a hydraulic fluid outlet, the Phase of the camshaft are adjusted or held relative to the crankshaft.

To control the camshaft adjuster, sensors record the characteristic data of the engine such as the load condition and the speed. These dates are fed to an electronic control unit, which after comparison of the Data with a characteristic field of the internal combustion engine, the adjusting motor of Camshaft adjuster or the inflow and outflow of hydraulic fluid to controls the various pressure chambers.

The axial position of the camshaft in the cylinder head of an internal combustion engine is determined by a two-way thrust bearing. Ideally located This is the camshaft adjuster end of the camshaft. This shifts the control drive level by thermal Elongation of the camshaft avoided under operating conditions.

Such a thrust bearing is known for example from DE 199 58 629 A1. In this case, the thrust bearing consists of a one-piece executed with the camshaft circumferential radial web, in an annular circumferential groove of a Bearing shell engages. This embodiment of an axial bearing of the camshaft is when using a camshaft adjuster with a central valve, the controlled by a central magnet, not suitable because of the interaction various components between camshaft thrust bearing and Central magnet large tolerances result. Therefore, a central magnet with required a large stroke, causing the axial length of the camshaft adjuster is significantly increased.

DE 100 13 877 A1 discloses a device for changing the control times presented by gas exchange valves of an internal combustion engine, wherein the camshaft thrust bearing on the side facing away from the cam of the camshaft adjuster is trained. A pressure medium adapter is by means of a fastening screw with a camshaft-fixed component of the camshaft adjuster connected. At the side facing away from the camshaft adjuster Pressure medium adapter is formed a radially extending collar. Between the pressure medium adapter and the camshaft adjuster is additional a washer arranged. The collar of the pressure medium adapter and the Washers form one on the outer circumferential surface of the pressure medium adapter annular circumferential groove into which a cylinder head fixed component, such as the cylinder head itself, a bearing bridge or a housing part intervenes. As a result, the camshaft is opposed to axial displacement secured to the cylinder head.

This formation of a thrust bearing of a camshaft through a washer and a pressure medium adapter facing away from the cam Side of the camshaft adjuster is attached, allows the use of a mounted within the camshaft or the rotor of the camshaft adjuster Central valve. Due to the small number of components between the camshaft thrust bearing and for the adjustment of the central valve necessary central magnet can in this solution, the tolerance chain and so that the stroke and thus the axial length of the central magnet reduced become.

A disadvantage is the large number of components in this embodiment out, which is needed for the axial bearing of the camshaft. This leads beside higher cost and weight of the additional components to an increased Installation effort. In addition, there are assembly errors, such as the accidental Omission of the washer, possible.

Summary of the invention

The invention is therefore based on the object, these disadvantages to avoid and a camshaft adjuster with a coaxial with the camshaft arranged to provide pressure medium distributor, the tolerance chain shortened between the camshaft thrust bearing and pressure distributor and the Component number of the camshaft bearing is minimized.

According to the invention, this object is achieved in that the pressure medium distributor and the camshaft adjuster together with a cylinder head fixed Component form a camshaft thrust bearing. It may be in the cylinder head fixed Component for example, the cylinder head itself, a bearing bridge or a housing part.

In the present invention, a camshaft adjuster is non-rotatable on a hollow portion of an at least partially hollow camshaft attached. The camshaft passes through the central bore of the driven part the camshaft adjuster, wherein they are in the axial direction over the area of the camshaft adjuster extends. Of course, it is also conceivable that instead of the camshaft an extension of the camshaft the camshaft adjuster engages, why below under camshaft either a Camshaft or an extension of this is understood.

The camshaft adjuster consists essentially of a drive wheel, a driven part and various housing parts, wherein at least two mutually acting pressure chambers are formed within these housing parts. The output member is in the present invention form-, friction, force or materially secured to the camshaft. The camshaft is hollow at the front end, which passes through the camshaft adjuster. Inside the camshaft, a pressure medium distributor is arranged. The pressure medium distributor directs the two counteracting pressure chambers to pressure medium. In this case, the pressure medium distributor can be designed either as a pressure medium adapter or as a central valve. If the pressure medium distributor is designed as a central valve, then this is advantageously actuated by a subsequent directly to the central valve electromagnetic actuator.
The pressure medium distributor projects beyond the camshaft on the side facing away from the cam of the camshaft adjuster in the axial direction and is connected with this force, material or positive fit. At the protruding from the camshaft end face of the pressure medium distributor is provided with a radially extending collar, which projects beyond the camshaft in the radial direction.

In the assembled state is thus between the camshaft adjuster and the radial collar of the pressure medium manifold an annular around the camshaft circumferential groove. In this groove engages a part of the cylinder head, a Bearing bridge or a housing. The radial collar of the pressure medium distributor prevents now in interaction with the cylinder head fixed component one axial migration of the camshaft further into the cylinder head. equally prevents the camshaft adjuster in interaction with the cylinder head fixed Component a wandering of the camshaft in the axially opposite Direction. It is conceivable that a part of the housing as Also, that the output part of the camshaft adjuster as a contact surface for the cylinder head part of the bearing is used.

By forming a contact surface of the thrust bearing on the camshaft adjuster and at a centrally located in the camshaft pressure medium distributor is the number of components and thus the cost and installation effort minimized. When using a central valve as Pressure fluid distributor can reduce the number of components, compared to one outside the camshaft adjuster arranged valve, from which the pressure chambers are supplied with pressure medium via a pressure medium adapter, be further minimized. Since the central valve itself is part of the camshaft thrust bearing is, is the tolerance chain between camshaft thrust bearing and central valve reduced to a minimum, reducing the stroke of the central magnet, which controls the central valve, can be made low. Thereby can the axial space of the central magnet and thus the whole unit be minimized.

In a further embodiment of the invention, the object is characterized solved that the pressure medium distributor alone, together with a cylinder head fixed Component forms a camshaft thrust bearing. As in the first embodiment, passes through an at least partially hollow executed camshaft a bore of a camshaft adjuster. The camshaft is on its front end, which passes through the camshaft adjuster, hollow executed. Furthermore, this end of the camshaft projects beyond the camshaft adjuster in the axial direction. The essentially of a drive part, an output member and housing parts existing camshaft adjuster is frictional, friction, positive or cohesive attached to the camshaft. On the drive side End is a pressure medium manifold in the hollow portion of the camshaft brought in. This extends in the axial direction of the camshaft adjuster beyond the front end of the camshaft out. Of the Pressure medium distributor can be designed as a pressure medium adapter. In this case it is provided with at least two pressure medium channels, through which the camshaft adjuster supplied via pressure holes in the camshaft becomes. Likewise, the use of a central valve is conceivable, which in essentially from a provided with holes sleeve and an inside the sleeve arranged control piston consists. On protruding from the camshaft front end of the pressure medium distributor is this with a formed radially extending collar, wherein the federal government in the radial direction the camshaft projects beyond. The pressure medium distributor is force, substance or positively connected to the camshaft.

In the assembled state, the drive-side end face of the camshaft is located in the axial direction within a cylinder head fixed component, such as the cylinder head itself, a bearing bridge or a lid. The cylinder head fixed component is provided with a bore in which the camshaft is arranged. On the inner lateral surface of the bore is a Ring groove formed in the radially projecting collar of the pressure medium distributor intervenes. The radial collar of the pressure medium distributor forms in this way in interaction with the cylinder head fixed component, the thrust bearing of the camshaft.

Advantageously, the output part via the camshaft or extension pushed the camshaft and frictional, positive or cohesive with this connected. Furthermore dominates the camshaft or the extension of Camshaft, the driven part in the axial direction on the cam facing away Side of the camshaft adjuster. The pressure medium distributor is within arranged at least partially hollow camshaft and can be designed as a pressure medium adapter or advantageously as a central valve be. In the case of a version as a central valve is provided, the pressure medium distributor form as a 4/3-way valve. The pressure medium distributor is force, positive, cohesive or by means of a screw in the camshaft attached and surmounted the camshaft in the axial direction. The pressure medium distributor has at the side facing away from the camshaft adjuster one radially outwardly extending collar on. It is envisaged that the Bund a part of the thrust bearing relative to the cylinder head fixed component forms.

Brief description of the drawings

Figur 1

einen Längsschnitt durch eine Vorrichtung zur Veränderung der Steuerzeiten einer Brennkraftmaschine (Nockenwellenversteller) nach Figur 1 a entlang der Linie I-I, die den prinzipiellen Aufbau eines Nockenwellenverstellers in Rotationskolbenbauart zeigt,

Figur 1 a

einen Querschnitt durch eine Vorrichtung zur Veränderung der Steuerzeiten einer Brennkraftmaschine (Nockenwellenversteller) nach Figur 1 entlang der Linie la-la, ohne Druckmittelverteiler, die den prinzipiellen Aufbau eines Nockenwellenverstellers in Rotationskolbenbauart zeigt,

Figur 2

einen Längsschnitt durch eine erfindungsgemäße Vorrichtung zur Veränderung der Steuerzeiten einer Brennkraftmaschine nach Figur 1 im montierten Zustand,

Figur 3

einen Längsschnitt durch eine erfindungsgemäße Vorrichtung zur Veränderung der Steuerzeiten einer Brennkraftmaschine nach Figur 1 in einem zweiten erfindungsgemäßen Montagezustand.

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

FIG. 1

a longitudinal section through a device for changing the timing of an internal combustion engine (camshaft adjuster) of Figure 1 a along the line II, showing the basic structure of a camshaft adjuster in rotary piston type,

FIG. 1 a

a cross-section through a device for changing the timing of an internal combustion engine (camshaft adjuster) of Figure 1 along the line la-la, without pressure medium manifold, showing the basic structure of a camshaft adjuster in rotary piston type,

FIG. 2

3 a longitudinal section through a device according to the invention for changing the control times of an internal combustion engine according to FIG. 1 in the installed state,

FIG. 3

a longitudinal section through an inventive device for changing the timing of an internal combustion engine of Figure 1 in a second inventive mounting state.

Detailed description of the drawings

Figures 1 a, 1 to 3 show a device for changing the timing an internal combustion engine (camshaft adjuster 1). It is in the Figures 1 and 1 a of the basic structure of a camshaft adjuster 1 in Rotary piston type shown, while in Figure 2 and 3 two inventive Camshaft adjuster shown in various installation variants are. In the illustrated embodiment, the camshaft adjuster 1 as Rotary piston adjuster shown. However, it is also conceivable other embodiments hydraulic powered camshaft adjuster 1 such as B. Axialkolbenversteller. The camshaft adjuster 1 consists essentially from a drive wheel 2, a driven part 3 and two disk-shaped executed side walls 4 and 5. The drive wheel 2 is in the illustrated Embodiment designed as a sprocket, which has a drive chain is connected to a crankshaft, not shown. As well but are also possible embodiments in which the drive wheel 2 as Pulley or gear is executed, which of a toothed belt or Gear drive is driven by the crankshaft. The drive wheel 2 and the Stripping part 3 are arranged concentrically with each other, wherein the radially inward lying lateral surface of the drive wheel 2 is provided with radial recesses 6 is, in the mounted on the driven part 3 bulges 7 engage. there it may be at the bulges 7 to extended ridges or Wing 8 act. The wings 8 are in axially extending grooves, in the lateral surface of the driven part 3 are arranged and are by means of a compression spring 9 sealing against the radially inner surfaces of Recesses 6 of the drive wheel 2 pressed.

In the axial direction of the camshaft adjuster 1 by the first and second side wall 4, 5 limited. For fixing the side walls 4 and 5 am Drive wheel 2 fasteners such as screws 10 are provided. The drive wheel 2, the driven part 3, the first and the second side wall 4, 5 form a plurality of separate pressure chambers, of the Wings 8 each divided into two oppositely acting pressure chambers 12, 13 become. For adjusting the phase of the camshaft 11 relative to the crankshaft For example, the first pressure chambers 12 are supplied with pressure medium and the second pressure chambers 13 with a pressure medium reservoir, not shown connected, the blades 8 attached to the rotor are displaced in such a way that that the volume of the first pressure chambers 12 and the greater second pressure chambers 13 is smaller. As a result, the rotor is relative to the camshaft 11 so twisted that the Gaswechselventilöffnungszeiten example be postponed to an earlier date. Analog effect the supply of the second pressure chambers 13 with pressure medium and the simultaneous Connecting the first pressure chambers 12 to the pressure medium reservoir an adjustment of the gas exchange valve opening times to a later date.

To prevent the wings 8 of the camshaft adjuster 1 in phases insufficient pressure medium supply, such as during the startup phase the internal combustion engine, uncontrolled between their end positions oscillate, the camshaft adjuster 1 is one shown in Figure 2 Locking device 14 is provided, which the output part 3 in these periods holds in a defined phase to the drive wheel 2. In an axial Bore of the driven part 3, a cartridge 15 is arranged, located on the first side wall 4 is supported. The cartridge 15 is axially extending Provided projection to which a coil spring 16 is arranged. The Spiral spring 16 acts on a pot-shaped piston 17 with a Force in the direction of the second side wall 5 in which a link 18 is formed is. In phases insufficient pressure medium supply, the piston 17 through the spring force held in the gate 18 and thus a solid phase relationship held between the camshaft 11 and crankshaft. To the locking mechanism to deactivate, engaging in the scenery 18 Front side of the piston 17 is acted upon by pressure medium, whereby the piston 17th against the spring force of the coil spring 16 in the axial bore of the driven part 3 is moved. To that between the piston 17 and the cartridge Dissipate 15 accumulating leakage pressure are radially extending Recesses in the cartridge 15 and thus communicating openings in the first side wall 4 is provided.

The camshaft adjuster 1 is non-positively, positively, frictionally or cohesively on a Camshaft 11 attached. The camshaft 11 carries one or more cams 19 and passes through a bore 20 of the driven part 3, wherein they Camshaft adjuster 1 on the side facing away from the cam 19 in axial Towering over. The camshaft 11 is at least at the front end, which passes through the camshaft adjuster 1, executed hollow. Within This cavity is a pressure medium distributor 21 is introduced. At the pressure medium distributor 21 may be a pressure medium adapter, the counteracting pressure chambers 12, 13 with a pressure medium pump or connects to the pressure medium reservoir.

In the present example, the pressure medium distributor 21 as the central valve 22nd executed. The central valve 22 is made of a sleeve-shaped Valve body 23 and a valve piston 24. The valve body 23 extends starting from the camshaft portion of the camshaft adjuster. 1 is encompassed, in the axial direction to over the drive side end of the Camshaft 11 addition. In this case, the outer diameter of the valve body 23rd adapted substantially to the inner diameter of the camshaft 11, and force, substance or positively connected with this. Exemplary here Connection methods such as screwing, press fit or gluing specified. At the protruding from the camshaft 11 front end of the Valve body 23 this is provided with a radially extending collar 42, which extends in the radial direction beyond the camshaft 11 addition.

The outer circumferential surface of the valve body 23 is provided with a first, a second, a third and a fourth annular channel 25, 26, 27, 28, wherein the annular channels 25 to 28 are arranged axially spaced from each other. Each of the annular channels 25 to 28 is a diameter reduction in the outer circumferential surface of the valve body 23 is executed and communicates with both each of a group of first to fourth openings 29, 30, 31, 32 in the Camshaft 11 are introduced as well as each having a group of in the Valve body 23 introduced fifth to eighth openings 33, 34, 35, 36, the connect the annular channels 25 to 28 with the interior of the central valve 22. ever one of the group of openings 29 to 32, one of the group of openings 33 to 36 and the respective associated annular channel 25 to 28 form a connection 37, 38, 39, 40. Furthermore, this is located in the camshaft 11 front end of the valve body 23 is provided with a ninth opening 41, the interior of the valve body 23 in the cavity of at least partially hollow camshaft 11 vented.

Within the valve body 23 is axially slidably executed a hollow Valve piston 24 is arranged. The valve piston 24 can via an actuating element 43rd an adjusting device 44 against the restoring force of the valve piston 24th engaging and on the interior of the valve body 23 supporting the spring 45th be moved in the axial direction. The adjusting device 44 may, for example be an electromagnet in which a connected to the actuator 43 Permanent magnet is arranged. By variation of the electromagnet supplied current can be the position of the permanent magnet, so that the position of the actuating element 43 and thus the position of the valve piston 24 be changed specifically.

The outer circumferential surface of the valve piston 24 is a fifth to seventh Ring channel 46, 47, 48 provided, in turn, as diameter reductions are executed in the outer circumferential surface of the valve piston 24. The fifth Ring channel 46 is over a tenth group of openings 49 and the seventh Ring channel 48 via an eleventh group of openings 50 with the interior of the Valve piston 24 connected. The interior of the valve 24 is with the exception of tenth and eleventh openings 49, 50 formed closed. In the illustrated Embodiment, the valve piston 24 is pot-shaped. The open end side of the valve piston 24 is by means of a disc-shaped element 51, which on both the valve piston 24, and the actuator 43rd is applied, pressure-tight.

In the following, the operation of the camshaft adjuster 1 will be explained. Via the first port 37, pressure medium is supplied to the fifth annular passage 46. The fifth annular channel 46 communicates over the tenth and eleventh openings 49, 50 with the seventh annular channel 48. The fifth annular channel 46 is such executed that he in each position of the actuator 44 first connection 37 communicates.

In a first switching state of the central valve 22, which is a de-energized State of the electromagnet of the adjusting device 44 corresponds, the valve piston 24 shifted by the spring 45 so that it has a position with minimum Distance to the adjusting device 44 occupies. Communicates in this position the seventh annular channel 48 via the third port 39 with first pressure medium lines 52, which open into the first pressure chambers 12. simultaneously the pressure medium from the second pressure chambers 13 via the second Pressure medium lines 53 and the fourth port 40 into the interior of the valve body 23, via the ninth opening 41 in the camshaft 11 and from there vented through vent holes 54 in the crankcase. As a result the gas exchange valve timing will be changed at an earlier time.

In a second, shown in Figure 1 position of the valve piston 24, the by energizing the electromagnet of the adjusting device 44 with a middle Amount of current is taken, the seventh annular channel 48 communicates neither with the third nor with the fourth port 40, whereby the pressure medium flow comes to a standstill and the current phase angle between the camshaft 11 and crankshaft is held.

In a third position flows through the electromagnet of the actuator 44 a current of maximum current. As a result, the valve piston 24 in a Position that is maximally removed from the actuator 44. In this Switching state of the central valve 22 is the pressure medium over the first Terminal 37, the fifth annular channel 46, the tenth and eleventh openings 49, 50 the seventh annular channel 48 and the fourth terminal 40 with the second Pressure medium lines 53 connected from where they into the second pressure chambers 13 open. At the same time, the first pressure chambers 12 via the first pressure medium lines 52, the third port 39, the sixth Ring channel 47 and the second port 38 connected to the pressure medium reservoir. As a result, an adjustment of the opening times of the gas exchange valves effected at a late date.

FIG. 2 shows a first installation situation of a camshaft adjuster according to the invention 1. The axial position of a camshaft 11 in the cylinder head of a Internal combustion engine is determined by a two-way thrust bearing. Ideally, this is located at the control drive end of the camshaft 11, a shift of the Steuertriebsebene by thermal elongation to avoid the shaft under operating conditions. In the present case the camshaft bearing by the output part 3 of the camshaft adjuster 1, the radially extending collar 42 of the valve body 23 and a cylinder head solid component 55 formed. The cylinder head fixed component 55 can the cylinder head itself, a bearing bridge or a housing part. The cylinder head fixed Component 55 surrounds the camshaft 11 in the area between the camshaft adjuster 1 and the radially extending collar 42nd

It is on the one hand on the radially extending collar 42nd at. In the illustrated embodiment passes through the cylinder head fixed Component 55 on its side facing away from the collar 42, the first side wall. 4 of the camshaft adjuster 1 and is applied to the driven part 3. An axial Displacement of the camshaft 11 is effectively prevented by this arrangement. Advantageously, the cylinder head fixed component 55 is designed so that it is the first side wall 4 of the camshaft adjuster 1 not the entire Scope of the camshaft 11 passes through, to effectively drain the To ensure pressure medium.

It is also conceivable, of course, that the second thrust bearing surface not on the driven part 3 of the camshaft adjuster 1, but on the first side wall. 4 is trained.

If a bearing bridge is provided as the cylinder-head-fixed component 55, then it can be designed in one or two parts.
In the case of the one-piece design, the camshaft adjuster 1 is first fixed on the camshaft 11 and inserted into the cylinder head. The bearing bridge is pushed with a bearing bore over a free end of the camshaft 11. Subsequently, the central valve 22 within the camshaft 11 force, substance or positively fixed. This can be done for example by means of a screw, a press fit or by gluing.
In the case of a two-part bearing bridge whose lower shell may already be attached to the cylinder head. In a first step, the camshaft 11 is inserted with fixed camshaft adjuster 1 and fixed central valve 22 in the lower shell. Subsequently, the upper part of the bearing bridge is placed on the lower shell and connected thereto.

FIG. 3 shows a further possibility of the axial bearing of the camshaft 11. The cylinder head fixed component 55 is provided with a bore 56. The inner lateral surface the bore 56 is provided with an annular circumferential groove 57. The camshaft 11 is in the bore 56 of the cylinder head fixed Component 55 arranged that the radially extending collar 42 of the valve body 23 in the annular circumferential groove 57 of the inner circumferential surface of the bore 56 intervenes. The cylinder head fixed member 55 is natural in this case designed as a two-part component. During assembly, the camshaft adjuster 1 joined to the camshaft 11. A lower shell of a bearing bridge is fixed in this case already on the cylinder head. The camshaft 11 with the fixed camshaft adjuster 1 and the pressure medium distributor 21 is in inserted the cylinder head. Subsequently, the upper part of the bearing bridge placed on the lower part over the free end of the camshaft 11. At the end Both upper and lower part are connected to each other, whereby the radial extending collar 42 together with the annular circumferential groove 57 the Camshaft thrust bearing yields.

reference numeral

1

Phaser

2

drive wheel

3

stripping section

4

first sidewall

5

second side wall

6

recesses

7

bulges

8th

wing

9

compression spring

10

screw

11

camshaft

12

first pressure chamber

13

second pressure chamber

14

locking device

15

cartridge

16

spiral spring

17

piston

18

scenery

19

cam

20

drilling

21

Fluid manifold

22

central valve

23

valve body

24

plunger

25

first ring channel

26

second ring channel

27

third ring channel

28

fourth ring channel

29

first opening

30

second opening

31

third opening

32

fourth opening

33

fifth opening

34

sixth opening

35

seventh opening

36

Eighth opening

37

first connection

38

second connection

39

third connection

40

fourth connection

41

ninth opening

42

Federation

43

actuator

44

setting device

45

feather

46

fifth ring channel

47

sixth ring channel

48

seventh ring channel

49

tenth opening

50

eleventh opening

51

element

52

first pressure medium line

53

second pressure medium line

54

ventilation holes

55

cylinder-head-resistant component

56

drilling

57

groove

Claims (10)

Camshaft adjuster (1) for adjusting and fixing the phase position of a camshaft (11) of an internal combustion engine with respect to a phase angle of the crankshaft with a driven by the crankshaft drive wheel (2), a camshaft-fixed output part (3), which is mounted on a camshaft (11) or an extension of the camshaft (11) and which is driven by the drive wheel (2) via a hydraulic actuator, wherein the actuator consists of at least one pair of mutually working hydraulic pressure chambers (12, 13) and wherein the pressure chambers (12, 13) via a pressure medium distributor (14) and pressure medium lines (52, 53) are supplied with pressure medium, characterized in that the pressure medium distributor (21) and the camshaft adjuster (1) together with a cylinder head fixed component (55) form a camshaft thrust bearing. Camshaft adjuster (1) for adjusting and fixing the phase position of a camshaft (11) of an internal combustion engine with respect to a phase angle of the crankshaft with a driven by the crankshaft drive wheel (2), a camshaft-fixed output part (3), which is mounted on a camshaft (11) or an extension of the camshaft (11) and which is driven by the drive wheel (2) via a hydraulic actuator, wherein the actuator consists of at least one pair of mutually working hydraulic pressure chambers (12, 13) and wherein the pressure chambers (12,13) via a pressure medium distributor (21) and pressure medium lines (52, 53) are supplied with pressure medium, characterized in that the pressure medium distributor (21) alone, together with a cylinder head fixed component (55) forms a camshaft thrust bearing. Camshaft adjuster (1) according to any one of claims 1 or 2, characterized in that the driven part (3) via the camshaft (11) or the extension of the camshaft (11) is pushed and is positively, positively or materially connected thereto. Camshaft adjuster (1) according to one of claims 1 or 2, characterized in that the camshaft (11) or the extension of the camshaft (11), the driven part (3) in the axial direction on the side facing away from the cam (19) of the camshaft adjuster (1 ) surmounted. Camshaft adjuster (1) according to any one of claims 1 or 2, characterized in that the pressure medium distributor (21) within the at least partially hollow camshaft (11) is arranged. Camshaft adjuster (1) according to one of claims 1 or 2, characterized in that the pressure medium distributor (21) is designed as a central valve (22). Camshaft adjuster (1) according to one of claims 1 or 2, characterized in that the pressure medium distributor (21) is designed as a 4/3-way valve. Camshaft adjuster (1) according to one of claims 1 or 2, characterized in that the pressure medium distributor (21) is positively, positively, materially or by means of a screw in the camshaft (11) is fixed. Camshaft adjuster (1) according to one of claims 1 or 2, characterized in that the pressure medium distributor (21) on the camshaft adjuster (1) facing away from a radially outwardly extending collar (42). Camshaft adjuster (1) according to one of claims 1 or 2, characterized in that the collar (42) forms a part of the thrust bearing relative to the cylinder head fixed component.

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