DE102009048238A1 - Vane type cam shaft adjusting device has side layer arranged perpendicularly to central axis, where spiral spring is rested upon side layer - Google Patents

Abstract

The vane type cam shaft adjusting device has a side layer (22) arranged perpendicularly to a central axis (25). A spiral spring (12) is rested upon the side layer. The spring is provided to hold a rotor opposite to a stator (1) in a certain angle position. A spring arm (15) is provided to the spiral spring.

Description

The invention relates to a Flügelzellennockenwellenversteller according to the one-part claim 1.

The not pre-published DE 10 2008 048 386.9-13 relates to a Flügelzellennockenwellenversteller with a perpendicular to its central axis arranged side plane on which rests a coil spring. The coil spring has a rectangular profile. A spring arm is angled through the side plane, so that the coil spring is rotatably supported positively against the stator. The spiral spring with rectangular profile keeps the rotor in a certain angular position relative to the stator. When the camshaft associated with the outlet can be brought with this coil spring, the rotor in an early exhaust camshaft position necessary for the engine start. In general, in both camshafts - ie inlet and outlet - by a bias of the coil spring in a torque direction, the alternating torques of the camshaft can be compensated, which are different degrees of effectiveness in the two directions of torque of the camshaft. These alternating moments are caused by the valve spring forces on the gas exchange valves and are highly dependent on the number of cylinders. The alternating moments are all the more irregular, the less cylinders the internal combustion engine has. In this case, the coil spring can be twisted in a particularly advantageous manner in the rest position in the torque direction "early", since the adjustment of the Flügelzellennockenwellenverstellers in the torque direction "late" due to the supporting effect of the alternating moments anyway faster. Thus, it is achieved by means of the spiral spring, that the adjustment in "early" as fast as in "late".

Furthermore, from the US 7,004,129 B2 nor a Flügelzellennockenwellenversteller known. On a plane perpendicular to the central axis side plane of a stator is located on a coil spring. This coil spring endeavors to hold a rotor relative to the stator in a certain angular position. The spiral spring consists of a wire with a round profile. This wire is supported by means of a first bend at the outer end to projections on the stator. By means of a second bend at the inner end of the coil spring is supported relative to the rotor.

From the EP 0 356 018 A1 is a Nockenwellverstelleinrichtung other type known in which a coil spring with rectangular profile applies.

Furthermore, from the US 6,155,219 a Flügelzellennockenwellenwellenversteller with a coil spring made of round wire known.

The object of the invention is to provide a Flügelzellennockenwellenversteller with low axial space requirement.

This object is achieved with the features of claim 1.

According to an advantage of the invention, a vane-type camshaft phaser is used. This Flügelzellennockenwellenversteller builds axially very short, which benefits the tight space conditions of both transversely and longitudinally installed drive trains.

According to a further advantage of the invention, a spring arm is analogous to the aforementioned DE 10 2008 048 386.9-13 angled through the side plane, so that the coil spring is rotatably supported positively against the stator. In this case, this spring arm can hold the coil spring in particular on the stator. However, such a connection can also be used alternatively or additionally for the rotor. In order to prevent the spring arm from being pulled out of the receiving opening in the stator or in the rotor during operation as a result of a rotation of the rotor relative to the stator, said spring arm is also secured axially relative to the stator. Consequently, no additional axial space must be kept in an advantageous manner. If the spring arm were not secured axially relative to the stator, then the spring arm could actually pull out and, moreover, the angle on the spring arm could increase. To produce the axial securing of the spring arm relative to the stator, an undercut is provided. This undercut is effected in particular by means of a bend on the spring arm, which engages behind a shoulder in the receiving opening for the spring arm.

Opposite Flügelzellennockenwellenverstellern with a suspension of the coil spring in pins or bolts of the invention Flügelzellennockenwellenversteller with relatively few components can be produced

On an additional cover for axial securing the coil spring can be omitted.

To take advantage of the entire spiral spring length, the spring arm can be arranged in a particularly advantageous manner with respect to the central axis radially outer end of the coil spring.

In a particularly advantageous manner, the spring arm in the unloaded state of the Flügelzellennockenwellenverstellers angled at an angle slightly below 90 °. This ensures that the coil spring at least in operation of the camshaft adjuster rests against the side plane and damps friction. This prevents the coil spring from swinging during operation. The angle can be selected in a particularly advantageous development so that the coil spring rests already in the unloaded state of the Nockwellenverstellers on the side plane.

In an analogous manner, a radially inner spring arm can be fixed against rotation with respect to the rotor. For this purpose, the radially inner spring arm can be angled and inserted through the side plane in a receiving recess of the rotor. In many cases, however, it is more advantageous for the non-rotatable connection relative to the rotor to bend the coil spring radially inward at the radially inner end and to engage in a radially aligned recess of a rotatably connected to the rotor or integrally formed with the rotor component. Such a rotatably connected to the rotor component is, for example, the so-called spring adapter. For connecting the rotor to the radially inner end of the coil spring but also bolts or pins can be provided.

The spiral spring may for example consist of a spring wire with round profile. On the other hand, if the spiral spring is manufactured with a rectangular profile, it can be manufactured with particularly small tolerances. Thus, the rectangular wire of the coil spring can be particularly well gripped by a jig and then the spring arm are angled. Thus, it is then possible to keep the coil spring on this angled spring arm with a clamping device on and wrap the spring to an exact size. For example, a round wire would be difficult to grip here with a tensioning device, since such a round wire is only frictionally engaged and not form-fitting. The winding takes place substantially around the central axis of the spiral spring. However, the coil spring is not wound exactly evenly, since some of the turns of the coil springs should abut each other, so that there is generated during the tension of the coil spring, a friction torque that prevents a swinging of the coil spring. This damping effect thus acting friction can also be adjusted exactly as a result of the rectangular profile.

In a particularly advantageous embodiment, the rectangular profile of the spiral spring is "upright" on the side level. Thus, the coil spring is bent in a particularly advantageous manner at the angled portion in the stiffer direction. Thus, this angled area on the one hand in the operation of the Flügelzellennockenwellenverstellers also aufzubiegen difficult. On the other hand, the coil spring is softer in the direction of rotation about the central axis, which improves their function. It is also possible with this orientation of the profile to accommodate more turns with more friction in the same space.

Further advantages of the invention will become apparent from the other claims, the description and the drawings. The invention is explained in more detail with reference to an embodiment.

Show

1 a Flügelzellennockenwellenversteller in a direction perpendicular to the central axis extending cutting plane,

2 the vane-cell camshaft adjuster 1 in a line II-II of 1 running view,

3 the vane-cell camshaft adjuster of 1 in a perspective view of a side facing away from the camshaft side,

4 the vane-cell camshaft adjuster of 1 in a detail in the area of the radially outer spring suspension of a coil spring and

5 the vane-cell camshaft adjuster of 1 in a perspective view of a side facing the camshaft.

With a Flügelzellennockenwellenwellenversteller the angular position between the crankshaft and the camshaft is changed during operation of an internal combustion engine. By turning the camshaft, the opening and closing times of the gas exchange valves are shifted so that the internal combustion engine brings its optimal performance at the respective speed. The Flügelzellennockenwellenversteller allows infinite adjustment of the camshaft relative to the crankshaft. The Flügelzellennockenwellenversteller has a cylindrical stature 1 on, rotatably with a in 2 apparent gear 2 connected is. In the embodiment, the gear 2 a sprocket over which a chain not shown in detail is guided. The gear 2 but may also be a toothed belt, over which a drive belt is guided as a drive element. About this drive element and the gear 2 is the stature 1 drivingly connected to the crankshaft in a known manner.

The stator 1 and the gear 2 may alternatively be integrally formed with each other when the other side of the stator 1 is openable. In doing so, the stature 1 and the gear 2 also made of metallic material or hard plastic. When metallic materials come Inter alia, sintered metals, steel sheets and aluminum in question. The stature 1 comprises a cylindrical stator base body 3 , on the inner side radially inwardly at equal intervals webs 4 protrude. Between neighboring bridges 4 become pressure chambers 5 formed, in which, controlled by a non-illustrated 4/3-way valve, pressure medium is introduced. Between neighboring bridges 4 protrude wings 6 extending radially outward from a cylindrical rotor body 7 a rotor 8th protrude. These wings 6 divide the pressure chambers 5 between the bridges 4 each in two pressure chambers 9 and 10 ,

The bridges 4 lie with their end faces sealingly on the outer circumferential surface of the rotor body 7 at. The wings 6 in turn lie with their end faces sealingly on the cylindrical inner wall of the stator main body 3 at.

The rotor 8th is rotatably connected to the camshaft, not shown. To change the angular position between the camshaft and the crankshaft, the rotor becomes 8th relative to stature 1 turned. For this purpose, depending on the desired direction of rotation, the pressure medium in the pressure chambers 9 or 10 pressurized while each other's pressure chambers 10 or 9 be relieved to the tank.

As in 2 it can be seen, is the stator 1 by means of screws between the gear 2 and a stator cover 20 braced. The frontal surfaces of the webs 4 and the wing 6 lie on the one hand close to the gear 2 and on the other hand, close to the stator lid 20 at. This stator cover 20 and the gear 2 also limit the pressure chambers 5 between the wings 4 in the axial direction. Thus, with the internal combustion engine switched off - ie with unloaded Flügelzellennockenwellenversteller - the rotor 8th takes the necessary for the engine start early exhaust camshaft position, the rotor 8th by a spiral spring 12 turned into a starting position. In this initial position there is a lock between the rotor 8th and the stator 1 for example, by a spring-loaded locking bolt 21 , This one is in one of the wings 6 accommodated. With pressure drop in the pressure chambers 9 . 10 will this locking bolt 21 moved by the spring force of a helical compression spring not shown in a locking position, in which this in a locking opening of the stator 1 intervenes. When starting the engine, the locking bolt is activated 21 loaded by the pressure medium against the spring force and pushed back, so that the rotor 8th from the stator 1 is unlocked and the Flügelzellennockenwellenwellenversteller can get into its control position.

The spiral spring 12 lies on a perpendicular to a central axis 25 the Flügelzellennockenwellenwellenstellstellers on the stator cover 20 arranged side level 22 on. In this case, the coil spring 12 a rectangular profile with a short profile width a and a long profile width b on. The short profile width a lies on the side level 22 on, leaving the coil spring 12 with their profile "upright" on the page level 22 rests.

The spiral spring 12 is with a radially inner end 14 rotatably with the rotor 8th connected. This is the radially inner end 14 the spiral spring 12 bent radially inward and engages in a radially oriented receiving recess 24 one rotatably with the rotor 8th connected spring adapter 23 one. This spring adapter 23 has a pin 11 on, by means of a press fit into a hub of the rotor 8th is plugged. Thus, the spring adapter 23 rotationally fixed relative to the rotor 8th , For non-rotatable connection of the rotor 8th with the camshaft is not shown in the drawing central screw through the spring adapter 23 plugged and bolted firmly to the camshaft so that the rotor 8th rotatably between the spring adapter 23 and the camshaft is braced The radially inwardly bent end 14 and the radial receiving recess 24 point to the central axis 25 the vane-cell camshaft adjuster.

The radially outer end of the coil spring 12 is non-rotatable and form-fitting on the stator 1 supported. For this purpose, this radially outer end in the unloaded state of Flügelzellennockenwellenverstellers as a spring arm 15 designed, which is angled. This bending takes place in accordance with the DE 10 2008 048 386.9-13 against the higher rigidity of the "edgewise form". The angled spring arm 15 is doing a recording 16 of the stator 1 plugged in. One of these receptions 16 bounding inner wall 17 of the stator 1 is excluded radially on the outside, so that the stator main body 3 one parallel to the central axis 25 extending gap 13 having. This gap 13 is slightly wider than the profile width b, so that the spring arm 13 can be used radially from the outside. The profile width b is thus within the receiving recess 16 on a tangent to the circumferential direction of the camshaft adjuster. Because the recording recess 16 However, on this tangent is considerably wider than the profile width b of the coil spring 12 , remains next to the gap 13 in the stator base body 3 a footbridge 11 , Thus, the lateral surface of the stator main body 3 radially outward open.

Behind this jetty 11 engages a spring end 26 of the spring arm 15 , which is angled radially outwardly almost at right angles. As if in a synopsis 2 and 5 can be seen is the gear 2 to create an axial bearing surface 19 for the spring end 26 in alignment with the receiving recess 16 with a window-like outbreak 18 provided, whose shape of the receiving recess plus the gap 13 minus the bridge 11 equivalent. This is the spring arm 15 axially opposite the stator 1 held.

• – die erste Ausnehmungsbreite x größer ist, als die Gesamtbreite y und
• – die schmale Nut z größer ist, als die kurze Profilbreite a und
• – schmale Nut z kleiner ist, als die Gesamtbreite y und
• – die Gesamtbreite y größer ist, als die kurze Profilbreite a und
• – die breite Nut c größer ist, als die langen Profilbreite b.

6 shows in a detail schematically the dimensioning of the window-like outbreak 18 , 7 shows in relation to the dimensioning of the spring end 26 , In these two figures, in addition to the said short profile width a and the long profile width b further dimensions can be seen. So shows 7 in addition, the total by the exhibition of the spring end 26 resulting total width y of a base area 28 the spring end 26 , 6 shows a to this total width y parallel recess width x in the recess 18 , Furthermore, a corresponding to the short profile width a narrow groove z is shown. With the long profile width b corresponds to a wide groove c. To an axial mounting - ie an axial insertion of the spring arm 15 - in the recess 18 to allow thus results in that the first recess width x is greater than the narrow groove z and

• - The first recess width x is greater than the total width y and
• - The narrow groove z is greater than the short profile width a and
• - Narrow groove z is smaller than the total width y and
• - The total width y is greater than the short profile width a and
• - The wide groove c is greater than the long profile width b.

This dimensioning or shaping of the Aunehmung 18 it also allows that spring arm 15 is pulled in the operating state in the narrow groove z. This is in 6 the position of the ground plane 28 the spring end 26 shown in dashed lines. This base area 28 results as the value of the product from the total width y multiplied by the long profile width b. The base area 28 ' the spring end 26 in the operating state, however, is shown dotted.

8th shows an alternative embodiment, the particular security against tilting of the spring arm 115 offers. This is an end face 27 at the end of the spring end 126 on the stator 101 or a stator-fixed component. Such a stator-fixed component may be, for example, a sprocket, a gear, a pulley, a cover or a locking disc. A locking disc is a cover, which has a recess for receiving the locking bolt 21 having.

9 shows a further alternative embodiment, in which the spring end 226 of the spring arm 215 over the stator 201 or a statorfestes component protrudes.

In 3 it can be seen that the windings of the spiral spring 12 Partially abut each other in unloaded Flügelzellennockenwellenversteller.

The vane camshaft adjuster may be applied to an intake camshaft and / or an exhaust camshaft. Likewise, the vane camshaft phaser may find application in a single camshaft which displaces both the inlet gas exchange valves and the outlet gas exchange valves.

The inner end of the coil spring is connected to the spring adapter, which is rotationally fixed to the rotor. Instead, the inner end may also be connected to the rotor itself or, alternatively, the camshaft.

The coil spring can also have a square profile or a round profile instead of a rectangular profile.

About the stator and coil spring, an additional spring cover can still be placed, which protects the coil spring on the one hand from dirt and other Umwalteinflüssen and on the other hand can form a friction partner for the coil spring. But this guard can also be made for example of plastic. However, if the Flügelzellennockenwellenversteller protected anyway by a chain case or belt box, so no additional protective cover is necessary.

In an alternative embodiment, the Flügelzellennockenwellenwellensteller is not driven by a toothed belt or a chain but by a gear of an axially offset arranged second camshaft adjuster.

The receiving recess need not be open by means of a gap to the lateral surface of the stator. It is also possible to thread the spring arm into a receiving recess, to lock or pinch. This benefits that the spring arm is elastically deformable.

The axial securing of the spring arm may also be issued radially inward or alternatively circumferentially at the spring end. The axial securing of the spring arm does not have to be at the spring end either. It is also possible to arrange this axial securing on another area of the spring arm, if an axially securing exhibition can grip behind the stature or the rotor. For example, the spring arm may be arc-shaped in a central region and engage in an opening of the stator.

The described embodiments are only exemplary Configurations. A combination of the described features for different embodiments is also possible. Further, in particular not described features of the device parts belonging to the invention are to be taken from the geometries of the device parts shown in the drawings.

LIST OF REFERENCE NUMBERS

1

stator

2

gear

3

stator base

4

Stege

5

pressure chambers

6

wing

7

Rotor body

8th

rotor

9

pressure chamber

10

pressure chamber

11

web

12

spiral spring

13

gap

14

radially inner end of the spiral spring 12

15

spring arm

16

receiving recess

17

inner wall

18

window-like outbreak

19

Axial contact surface

20

Stator

21

locking bolt

22

page level

23

spring adapter

24

receiving recess

25

central axis

26

spring end

27

face

28

Floor space

28 '

Floor space

101

stator

115

spring arm

126

spring end

201

stator

215

spring arm

226

spring end

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 102008048386 [0002, 0009, 0031]
• US 7004129 B2 [0003]
• EP 0356018 A1 [0004]
• US 6155219 [0005]

Claims (12)

Vane-cell camshaft adjuster with a perpendicular to its central axis ( 25 ) arranged side level ( 22 ), on which a spiral spring ( 12 ), which endeavors to provide a rotor ( 8th ) with respect to a stator ( 1 ) in a certain angular position, wherein a spring arm ( 15 ) of the spiral spring ( 12 ) - through the page level ( 22 ) is angled through, so that the spiral spring ( 12 ) rotatably positively against the stator ( 1 ) or the rotor ( 8th ) is supported and - has a flared area which engages behind a statorfestes or rotorfestes component, so that the spring arm ( 15 ) axially opposite the stator ( 1 ) or rotor ( 8th ) is held. Flügelzellennwellenwellenversteller according to claim 1, characterized in that the issued area at the end of the spring arm ( 15 ) and is angled almost at right angles. Flügelzellennockenwellenversteller according to any one of the preceding claims, characterized in that the spring arm ( 15 ) by a parallel offset to a central axis ( 25 ) of the vane-cell camshaft adjuster gap ( 13 ) into a receiving well ( 16 ) of the stator ( 1 ), which is open on the lateral surface of the Flügelzellennockenwellenwellenverstellers. Flügelzellennwellenwellenversteller according to any one of the preceding claims, characterized in that the spiral spring ( 12 ) has a rectangular profile. Flügelzellennockenwellenversteller according to any one of the preceding claims, characterized in that the spring arm ( 15 ) of the spiral spring ( 12 ) radially outside the central axis ( 25 ), this spring arm ( 15 ) rotatably positively against the stator ( 1 ) is supported. Flügelzellennwellenwellenversteller according to claim 2, characterized in that the spring arm ( 15 ) in a receiving well ( 16 ) of a movement with the stator ( 1 ) connected component - in particular the stator, a sprocket, a Zahrades, a pulley or a cover / locking disc - is inserted. Flügelzellennockenwellenversteller according to claim 2 or 3, characterized in that the spring arm ( 15 ) at the radially outer end of the coil spring ( 12 ) and is angled in the unloaded state of the Flügelzellennockenwellenverstellers at an angle of at least approximately 90 °. Flügelzellennwellenwellenversteller after one of the preceding. Claims, characterized in that the coil spring is fixed by means of the spring arm at a radially inner end against rotation of the rotor. Flügelzellennockenwellenversteller according to claim 8, characterized in that the coil spring is also fixed by means of a further spring arm at a radially outer end. Flügelzellennwellenwellenversteller according to any one of the preceding claims, characterized in that windings of the spiral spring ( 12 ) abut each other with unloaded Flügelzellennockenwellenversteller Flügelzellennockenwellenversteller according to any one of the preceding claims, characterized in that the spring arm is suspended by a parallel offset to a central axis of the Flügelzellennockenwellenverstellers gap in a receiving recess of the stator, which is closed on the lateral surface of the Flügelzellennockenwellenwellenverstellers. Flügelzellennockenwellenversteller according to claim 4, characterized in that the rectangular profile of the spiral spring ( 12 ) one on the side surface ( 22 ) lying short profile width (a) and a long profile width (b), wherein the spring end ( 26 ) during assembly by a statorfeste recess ( 18 ) is inserted, said recess ( 18 ) - one with respect to the total width (y) of the base ( 28 ) of the spring end ( 26 ) parallel and wider recess width (x) and - a narrow groove (z) corresponding to the short profile width (a) and - a groove (c) corresponding to the long profile width (b), the narrow groove (z) is wider than the short profile width (a) and the wide groove (c) is wider than the long profile width (b), so that an axial insertion of the spring arm ( 15 ) is possible and the spring arm ( 15 ) is pulled in the operating state in the narrow groove (z).

Images