DE102013222826A1 - Phaser - Google Patents

Abstract

Camshaft adjuster (2) comprising a stator (4) which can be driven by a crankshaft of an internal combustion engine, a rotor (6) which can be connected non-rotatably to a camshaft of the internal combustion engine, wherein the rotor (6) has a rotor core (8) and a plurality of rotor core (8). radially outwardly projecting wing (10), a between the stator (4) and the rotor (6) acting torsion spring (12) having between a first spring end (14) and a second spring (16) helical windings (18) in that the first spring end (14) is connected to the stator (4) and the second spring end (16) is connected to the rotor (6), and a rotor core ring (22) arranged on an end face (20) of the rotor core (8) a spring chamber (24) for the turns (18) of the torsion spring (12), wherein the rotor core ring (22) in the radial direction (R) has an annular opening (26) through which the first spring end (14) leads to the stator (4) to be connected.

Description

The invention relates to a camshaft adjuster, comprising a stator drivable by a crankshaft of an internal combustion engine, a rotatably connected to a camshaft of the internal combustion engine rotor, wherein the rotor has a rotor core and a plurality of the rotor core radially outwardly projecting wings, one between the stator and the rotor acting torsion spring having helical turns between a first spring end and a second spring, wherein the first spring end to the stator and the second spring end is connected to the rotor, and arranged on an end face of the rotor core rotor core ring, a spring space for the windings of the Torsion spring forms.

A generic camshaft adjuster is for example from the DE 10 2006 022 219 A1 known. The camshaft adjuster has in its basic structure a drivable by a crankshaft stator and a rotatably connected to the camshaft rotor. In order to drive the stator, a chain drive or a belt drive can be formed between the stator and the crankshaft. The rotor can be fixed, for example, positively and / or non-positively on the camshaft.

For the camshaft adjuster an annular space is usually provided between the stator and the rotor, which is divided by non-rotatably connected to the stator, radially inwardly projecting Statorstege in a plurality of working chambers, each by a radially projecting from the rotor core to the outside wings are divided into two pressure chambers. The camshaft adjuster is preferably a hydraulic camshaft adjuster. Depending on the loading of the pressure chambers with a pressure medium of the rotor relative to the stator and thus also the camshaft relative to the crankshaft in the direction of "early" or "late" adjusted. The camshaft adjuster thus serves to set a relative angular position of the camshaft to the crankshaft. The pressure build-up of the pressure medium is usually via the crankshaft, with the result that only a small pressure medium flow is provided at low speeds. This low flow of pressure medium has the disadvantage that under unfavorable circumstances, an undesirable adjustment of the camshaft adjuster can occur, which can result in unfavorable consumption of the engine, in particular in the cold start phase, with unfavorable fuel consumption with a troubled run as a result.

In order to ensure smooth running even with unfavorable operating behavior of the internal combustion engine, a camshaft adjuster is known from the cited prior art, which provides a helical torsion spring between the rotor and the stator. The spiral torsion spring is a spring whose spiral turns extend from a first spring end of decreasing radius in a substantially inward plane to a second spring end. For a compact design of the camshaft adjuster, the turns of the torsion spring are introduced into a spring chamber of the rotor core. The spring chamber is bounded by a circumferential rotor core edge in the radial direction. Radially inside, the rotor core edge in the region of one of the wings on a rotor groove, which preferably extends into the wing. The torsion spring is inserted with a radially outer end of the spring in the rotor groove to interact positively with the rotor. The radially inner spring end of the torsion spring is connected to a mounting on an inner side of a front-side stator cover in order to cooperate with the stator.

In practice, it has been found that a lateral attachment of the radially inner spring end brings a difficult assembly with it. In particular, it is not possible first to mount the spring and to check its correct fit before the stator cover is attached and closes one end face of the stator.

The object of the invention is to provide a camshaft adjuster with a helical torsion spring which is particularly easy and safe to assemble.

To solve the object of the invention, a camshaft adjuster is proposed, comprising a drivable by a crankshaft of an internal combustion engine stator, a rotatably connected to a camshaft of the internal combustion engine rotor, wherein the rotor has a rotor core and a plurality of the rotor core radially outwardly projecting wings, one between the torsion spring acting on the stator and the rotor having helical windings between a first spring end and a second spring, the first spring end being connected to the stator and the second spring end being connected to the rotor, and a rotor core ring arranged at an end face of the rotor core Forming spring space for the turns of the torsion spring, wherein the rotor core ring in the radial direction has an annular opening through which the first spring end leads to be connected to the stator.

The proposed solution, it is possible to mount the torsion spring before the stator and / or the rotor are frontally covered by a lid. For this purpose, the rotor core to a its front sides on a rotor core ring, which forms a spring chamber for the turns of the torsion spring. The rotor core may, for example, have a hollow cylindrical shape, one end face of which is closed and a remaining end face is open. Through the open end, the turns of the torsion spring can be introduced into the spring chamber. Preferably, the turns are completely inserted into the spring chamber. In order to connect the first spring end of the torsion spring to the stator, the rotor core ring has a ring opening in the radial direction. The rotor core ring is thus not completely closed on the shell side, but provided with the ring opening. By the ring opening is meant any opening or recess in the radial direction of the rotor core ring through which the first spring end can be guided or stretched to secure the first spring end to the stator. After the first spring end is attached to the stator and the second spring end to the rotor, a simple visual inspection of the correct attachment and / or the correct fit of the torsion spring is possible. Then the stator can be covered with at least one starter cover. In summary, the installation effort of the camshaft adjuster can be simplified and at the same time made safer by the proposed solution.

A preferred embodiment of the camshaft adjuster is characterized in that a receptacle of the rotor core protrudes axially into the spring chamber, wherein the second spring end is fastened on the outside of the receptacle. In particular, the second spring end is fixed radially on the outside of the receptacle. The receptacle may be, for example, a pin-shaped projection which extends from an inside end face of the spring chamber. Preferably, the receptacle is arranged coaxially with the spring chamber. Thus, the windings between the receptacle and a shell inner side of the rotor core ring can be arranged. By attaching the second spring end of the torsion spring to the receptacle, the entire torsion spring can be arranged in a plane. In other words, the torsion spring from the first spring end, which is connected to the receptacle, with increasing radius in a plane from the inside to the outside through the ring opening to the second spring end, which is connected to the stator. The torsion spring therefore acts between the stator and the rotor in such a way that a torque is exerted on the stator or on the rotor about the respective longitudinal axis. Transverse forces are at least substantially not caused by the torsion spring, since the torsion spring extends in the aforementioned plane. After mounting the torsion spring therefore there is no risk that it slips out before the stator is closed at the front.

A further preferred embodiment of the camshaft adjuster is characterized in that the torsion spring is arranged in a plane with the stator and / or rotor. This embodiment further ensures that the torsion spring between the stator and the rotor acts in such a way that only a torque about the respective longitudinal axis is exerted on the stator or the rotor. Transverse forces can be largely excluded by an arrangement in a common plane.

A further preferred embodiment of the camshaft adjuster is characterized in that the receptacle radially outwardly has a receiving groove into which the second spring end is inserted. In other words, the receptacle on its outer shell side having the receiving groove. The receiving groove facilitates the assembly of the torsion spring by the second spring end can be inserted into the receiving groove to make the connection to the rotor.

A further preferred embodiment of the camshaft adjuster is characterized in that the stator has radially inside a Statornut, in which the first spring end is inserted. Through the ring opening of the rotor core ring, the first spring end is led out of the spring chamber of the rotor core ring. For fixing this first spring end, the stator has a stator groove on the radially inner side or on an inner circumferential surface. The stator groove may have the form of any and / or suitable groove. The first spring end is inserted into the stator groove, so that the torsion spring connects to the stator. If the stator is designed as a bore, the stator also prevents lateral slippage of the first spring end. By providing a stator groove, the assembly of the first spring end is particularly simple and safe possible.

A further preferred embodiment of the camshaft adjuster is characterized in that between the stator and the rotor is an annular space, which is divided by a rotatably connected to the stator, radially inwardly projecting Statorstege in a plurality of working chambers, each of one of the wings in two pressure chambers are divided, wherein one of the stator webs has the stator. The subdivision of the annular space through the stator webs is known from the prior art. By at least one of the stator bars having a stator, this Statorsteg is now assigned a dual function. On the one hand, the stator web continues to serve to divide the annulus. Furthermore, the stator web serves for fastening the first spring end of the torsion spring. Since the stator bar protrudes into the annulus to divide it, the distance to the rotor core is especially low. Thus, the torsion spring does not have to bridge a large distance between the ring opening and the stator slot. A negative effect of the torsion spring on a pressure medium in the working chambers is therefore particularly low or can even be almost completely excluded. In addition, this design ensures a very compact design.

A further preferred refinement of the camshaft adjuster is characterized in that the rotor core ring has a rotor ring sealing surface adjoining the ring opening radially on the outside, and that the stator has a stator sealing surface radially on the inside, adjacent to the stator groove, the rotor sealing surface and the stator sealing surface abutting one another. By abutting sealing surfaces of the influence of the torsion spring on the working chambers and / or the pressure medium is further reduced. Moreover, it is possible with this configuration that the spring chamber is sealed against the annulus and / or the working chambers. This further reduces the aforementioned influence of the torsion spring.

A further preferred embodiment of the camshaft adjuster is characterized in that a seal is introduced between the rotor sealing surface and the stator sealing surface. The seal is for example advantageous if very high pressures prevail in the working chambers. In this case, the seal allows a better separation of the working chambers of the spring chamber.

Another preferred embodiment of the camshaft adjuster is characterized in that the ring opening is arranged between two adjacent wings. As previously explained, the vanes serve to divide the working chambers into pressure chambers. From the perspective of the stator so the Statorstege protrude between the wings. By locating the ring opening between two adjacent wings, the first spring end in the area leads out of the rotor core ring to which the stator land points, which projects between the same, adjacent wings. Particularly preferably, this stator also has the Statornut to make the connection to the first spring end of the torsion spring. Thus, surprisingly few modifications are necessary to arrange the torsion spring in a plane with the stator and / or rotor and at the same time bring about particularly small to no undesirable effects on the working chambers or their working media through the torsion springs.

A further preferred embodiment of the camshaft adjuster is characterized in that the rotor core ring is designed in the circumferential direction C-shaped with two ring ends, wherein the ring opening is formed between the ring ends. Such a rotor core ring is particularly easy to manufacture. Furthermore, this rotor core ring facilitates the assembly of the torsion spring, since the first spring end can be inserted from an end face of the rotor axially into the ring opening.

A further preferred embodiment of the camshaft adjuster is characterized in that the annular opening in the circumferential direction of the ring has an opening angle between 2 and 70 degrees, preferably between 5 and 50 degrees. Such an opening angle allows a change of a relative angular position about a respective longitudinal axis of the rotor to the stator. Thus, the relative angular position between the crankshaft and the camshaft can be adjusted accordingly far.

A further preferred embodiment of the camshaft adjuster is characterized in that the stator web having the stator slot is formed over an angle which is greater than the opening angle. This configuration allows the ring opening to be sealed to the stator web and / or undesirable effects of the torsion spring on the working chambers or their working media is particularly low.

The invention will be explained below with reference to a preferred embodiment with reference to the accompanying figures. Showing:

1 a side view of the camshaft adjuster according to the invention;

2 a sectional view of the camshaft adjuster according to the invention along a section in the transverse direction;

3 a sectional view of the camshaft adjuster according to the invention along a section in a longitudinal direction; and

4 a sectional view of the camshaft adjuster according to the invention along a further section in a longitudinal direction.

In the 1 and 2 is in each case a camshaft adjuster 2 to recognize the nature of a vane adjuster for a camshaft adjusting. The camshaft adjuster 2 has a known design of a driven by a crankshaft or other drive shaft stator 4 and one opposite the stator 4 rotatably mounted rotor 6 on.

The stator 4 has three radially inwardly projecting Statorstege in the present embodiment 36 on which an annulus 34 between the stator 4 and the rotor 6 on three working chambers 38 divide. The working chambers 38 in turn, by three radially from a rotor core 8th of the rotor 6 outwardly projecting wings 10 in each case two pressure chambers 40 divided into different effective direction. For adjustment of the rotor 6 opposite the stator 4 gets into the working chambers 38 the same direction of action via a pressure medium control system pressure medium, such. As hydraulic oil, introduced while the pressure medium from the pressure chambers 40 the respective other effective direction is returned to a pressure medium reservoir. By introducing the pressure medium in the pressure chambers 40 the first direction of action and the discharge of the pressure medium from the pressure chambers 40 the other direction of action is the volume of the pressure chambers 40 the first direction of action increases and the volume of the pressure chambers 40 the other direction of action decreases, so that the rotor 6 either clockwise or counterclockwise with respect to the stator 4 is twisted. Due to the preferred pressure medium of the camshaft adjuster 2 Also referred to as hydraulic camshaft adjuster.

More details can the 3 and 4 be removed. That's the stator 4 on a front side 20 with a stator-fixed locking cover 42 screwed, which the working chambers 38 or the pressure chambers 40 closes laterally. In the in the 4 shown locking lid 42 is also a locking groove 44 provided in the form of a circular recess which is arranged such that it after screwing the locking cover 42 on the stator 4 in the middle between two stator bars 36 of the stator 4 is arranged. In the rotor 6 is also a locking pin 46 provided, which in each case by means of a spring in the direction of the locking cover 42 spring loaded. The locking pin 46 is so on the rotor 6 arranged to be in a center position of the rotor 6 in the middle between the stator bars 36 just above the locking groove 44 of the locking lid 42 comes to rest and in this position due to the acting spring force in the locking groove 44 locked.

In order to ensure smooth running even with unfavorable operating behavior of the internal combustion engine, has the camshaft adjuster 2 a helical torsion spring 12 between the rotor 6 and the stator 4 on. Through the torsion spring 12 becomes the rotor 6 opposite the stator 4 biased so that the rotor 6 moved to a rest position, if in the pressure chambers 40 no sufficient counter torque is generated. In the spiral torsion spring 12 it is a spring whose spiral turns 18 from a first spring end 14 with decreasing radius in a substantially inward plane to a second spring end 16 run. For a compact design of the camshaft adjuster 2 are the turns 18 the torsion spring 12 in a spring room 24 of the rotor core 8th brought in. The spring chamber 24 is thereby by a to a front page 20 of the rotor core 8th arranged rotor core ring 22 border. The rotor core ring 22 forms the spring chamber in this way 24 , which to the said end face 20 is designed to be open. In this case, the spring chamber extends 24 in the longitudinal direction L of the rotor core 8th only over a part or form only a portion of the rotor core 8th ,

The lateral surface of the rotor core ring 22 However, it is not completely closed, but has an annular opening in the radial direction R. 26 on. Through this ring opening 26 becomes the first end of the spring 14 guided, then in a radially inwardly arranged stator 32 of the stator 4 to be plugged. By inserting the first spring end 14 in the stator groove 32 becomes the first end of the spring 14 with the stator 4 connected. For easier insertion of the first spring end 14 can the stator groove 32 to a front side 20 be made open. To a mounting of the torsion spring 12 further facilitate is the rotor core ring 22 in the circumferential direction preferably C-shaped with two ring ends 42 designed, with the ring opening 26 between the ring ends 42 formed. Thus, the first spring end 14 at the same time from the front side 20 out into the ring opening 26 and in the stator groove 32 be plugged in.

For a connection between the torsion spring 12 and the rotor 6 points the rotor core 8th a recording 28 on. The recording 28 protrudes axially in the center of the spring chamber 24 so that the second spring end 16 easily with the recording 28 can be connected. For this purpose, the recording 28 a receiving groove 30 on, in which the second spring end 16 is inserted. The recording is preferred 28 to the front side 20 designed open, so that the torsion spring 12 with the second spring end 16 and the turns 18 from the front side 20 out in the rotor 6 and in the stator 4 can be inserted. With the insertion of the second spring end 16 becomes the connection between the torsion spring 12 and the rotor 6 produced. The turns 18 the torsion spring 12 are between the recording 28 and the rotor core ring 22 arranged. Like from the 1 to 4 shows are the inclusion 28 , the spring room 24 and the rotor core ring 22 aligned coaxially with each other.

By the torsion spring 12 or the first spring end 14 the torsion spring 12 through the rotor core ring 22 it is possible that the torsion spring 12 in a plane with the stator 4 and the rotor 6 is arranged. To further ensure this is the torsion spring 12 with their spring ends 14 . 16 in the aforementioned plane on the stator 4 or the rotor 6 attached. Thus it is provided that the receiving groove 30 the recording 28 as well as the stator groove 32 of the stator 4 are arranged in the aforementioned plane. This allows a very compact design of the camshaft adjuster 2 ,

Like from the 1 and 2 can be seen, has one of the stator bars 36 the stator groove 32 on. The stator bars 36 are radially inside with the rotor core ring 22 in contact and / or store this. By an arrangement of the ring opening 26 opposite the one stator bar 36 with the stator groove 32 ensures that the first spring end 14 from the ring opening 26 directly into the stator groove 32 leads. The first spring end 14 thus neither crosses one of the working chambers 38 another one of the pressure chambers 40 , The torsion spring 12 thus has virtually no influence on a pressure medium in the working chambers 38 ,

To ensure that the ring opening 26 directly to the Statorsteg 36 with the stator groove 32 adjacent, it is provided that the ring opening 26 between two adjacent wings 10 is arranged. Like from the 1 and 2 it can be seen, the rotor has 6 three wings 10 on, with two of these wings 10 have an increased angular distance from each other. In the area between the previously mentioned two wings 10 can the stator bridge 36 with the stator groove 32 protrude. Furthermore, this stator web extends 36 over an angle S, which is significantly larger than an opening angle W of the ring opening 26 is. When the rotor 6 now relative to the stator 4 twisted, covered the Statorsteg 36 regardless of a relative angle of rotation between the rotor 6 and the stator 4 the ring opening 26 , A disturbing influence of the torsion spring 12 on the working chambers 38 is thus effectively prevented.

Although the rotor core ring 22 radially outside in contact with the stator webs 36 is there is a risk of leakage between one of the working chambers 38 and the spring chamber 24 , To prevent a pressure fluid from one of the working chambers 38 in the spring chamber 24 penetrates, points the rotor core ring 22 radially on the outside one to the ring opening 26 adjacent rotor ring sealing surface. The same applies to the stator 4 , This preferably has radially on the inside a to the stator 32 adjacent stator sealing surface. In addition, a seal may be provided between the rotor sealing surface and the stator sealing surface, so that the spring chamber 24 pneumatically from the working chambers 38 is decoupled.

LIST OF REFERENCE NUMBERS

L

longitudinal direction

R

radial direction

S

angle

W

opening angle

2

Phaser

4

stator

6

rotor

10

wing

12

torsion spring

14

first spring end

16

second spring end

18

turns

20

front

22

Rotor core ring

24

spring chamber

26

ring opening

28

admission

30

receiving groove

32

stator

34

annulus

36

Statorsteg

38

working chamber

40

pressure chamber

43

locking cover

44

locking

46

locking pin

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 102006022219 A1 [0002]

Claims (10)

Camshaft adjuster ( 2 ), comprising - a stator drivable by a crankshaft of an internal combustion engine ( 4 ), - a rotatably connected to a camshaft of the internal combustion engine rotor ( 6 ), wherein the rotor ( 6 ) a rotor core ( 8th ) and several of the rotor core ( 8th ) radially outwardly projecting wings ( 10 ), - one between the stator ( 4 ) and the rotor ( 6 ) acting torsion spring ( 12 ), which between a first spring end ( 14 ) and a second spring ( 16 ) spiral windings ( 18 ), wherein the first spring end ( 14 ) with the stator ( 4 ) and the second spring end ( 16 ) with the rotor ( 6 ), and - one at one end ( 20 ) of the rotor core ( 8th ) arranged rotor core ring ( 22 ), a spring chamber ( 24 ) for the turns ( 18 ) of the torsion spring ( 12 ), characterized in that - the rotor core ring ( 22 ) in the radial direction (R) an annular opening ( 26 ), through which the first spring end ( 14 ) to connect with the stator ( 4 ). Camshaft adjuster ( 2 ) according to the preceding claim, characterized in that a receptacle ( 28 ) of the rotor core ( 8th ) axially in the spring chamber ( 24 ), wherein the second spring end ( 16 ) on the outside of the receptacle ( 28 ) is attached. Camshaft adjuster ( 2 ) according to one of the preceding claims, characterized in that the torsion spring ( 12 ) in a plane with the stator ( 4 ) and / or the rotor ( 6 ) is arranged. Camshaft adjuster ( 2 ) according to the preceding claim, characterized in that the receptacle ( 28 ) radially on the outside a receiving groove ( 30 ), in which the second spring end ( 16 ) is inserted. Camshaft adjuster ( 2 ) according to one of the preceding claims, characterized in that the stator ( 4 ) radially inside a Statornut ( 32 ), in which the first spring end ( 14 ) is inserted. Camshaft adjuster ( 2 ) according to the preceding claim, characterized in that between the stator ( 4 ) and the rotor ( 6 ) an annulus ( 34 ), which rotates with the stator ( 4 ), radially inwardly projecting Statorstege ( 36 ) into a plurality of working chambers ( 38 ), each one of the wings ( 10 ) in two pressure chambers ( 40 ), wherein one of the stator webs ( 36 ) the stator groove ( 32 ) having. Camshaft adjuster ( 2 ) according to one of the preceding claims, characterized in that the ring opening ( 26 ) between two adjacent wings ( 10 ) is arranged. Camshaft adjuster ( 2 ) according to one of the preceding claims, characterized in that the rotor core ring ( 22 ) in the circumferential direction C-shaped with two ring ends ( 42 ) is configured, wherein the ring opening ( 26 ) between the ring ends ( 42 ) trains. Camshaft adjuster ( 2 ) according to one of the preceding claims, characterized in that the ring opening ( 26 ) in the circumferential direction of the rotor core ring ( 22 ) has an opening angle (W) between 2 and 70 degrees, preferably between 5 and 50 degrees. Camshaft adjuster ( 2 ) according to the preceding claim, characterized in that the stator groove ( 32 ) having stator bridge ( 36 ) is formed over an angle (S) which is greater than the opening angle (W).

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