DE102012111901A1 - Camshaft adjusting device for cam shaft arrangement for arranging valve train of internal combustion engine of motor car, has cam shaft adjusting assistance of first and second rotors over first and second partial switching position - Google Patents

Abstract

The device (1) has a first rotor (3) rotated between first and second end positions relative to a drivable stator (2), and second rotor (4) rotated between the first and second end positions relative to the first rotor for adjusting a cam shaft of an internal combustion engine. The cam shaft adjusts assistance of the device over a first partial switching position and a second partial switching position. The cam shaft adjusts assistance of the first rotor over the first partial switching position and assistance of the second rotor over the second partial switching position. An independent claim is also included for a cam shaft arrangement.

Description

The invention relates to a camshaft adjuster comprising a drivable stator, a rotatable relative to the stator between a first end position and a second end position and a first rotor rotatable relative to the first rotor between a first end position and a second end position second rotor for adjusting a camshaft of an internal combustion engine , Moreover, the invention relates to a camshaft arrangement with such a camshaft adjuster.

From the DE 102 53 883 A1 an adjusting device is known for camshafts, especially of motor vehicles, with a stator having radially inwardly projecting webs, projecting between the wings of a rotor which is rotatable relative to the stator and whose wings are acted upon on both sides with pressure medium, wherein the rotor in a position relative to the stator is locked, which has at least one locking hole into which a locking element of the rotor engages, which is adjustable by the pressure medium in its FreigabesteIlung to form the adjustment so that in a structurally simple and reliable manner, the rotor relative to the stator an optimal position when starting the engine occupies.

From the DE 10 2011 001 301 A1 is a Schwenkmotorversteller known with a driven stator, which follows a first hydraulic power transmission line, a first rotor, followed by a second hydraulic power transmission line, a second rotor which is rotatably connected to a second camshaft part, which is arranged coaxially to a first camshaft part, which rotatably connected to the first rotor to provide a Schwenkmotorversteller, which allows an adjustment of a two-piece camshaft with an inner shaft and an outer WeIle. In a wing of the first rotor, a first latch is provided, with which the first rotor can be fixed positively against the stator. A wing of the second rotor has a second lock, with which the inner rotor can be fixed against the intermediate rotor. For more detailed information about the features of the present invention is expressly to the publication DE 10 2011 001 301 A1 directed. The teaching of this publication is to be regarded as part of the present document. Features of this publication are features of the present document.

The object of the invention is to constructively and / or functionally improve and / or adapt a camshaft adjuster mentioned above. In particular, an adjustment of a one-piece camshaft should be possible. In particular, a center lock should be enabled and / or improved. In particular, problems in a start-stop operation of an internal combustion engine should be reduced or avoided. In particular, undefined and / or difficult-to-define states should be reduced or avoided, for example with regard to hydraulic pressure, hydraulic volume flow and / or effective forces / moments. In addition, a camshaft assembly to be provided with such a camshaft adjuster.

The object is achieved with a camshaft adjuster comprising a drivable stator, a rotatable relative to the stator between a first end position and a second end position first rotor and a rotatable relative to the first rotor between a first end position and a second end position second rotor for adjusting a Camshaft of an internal combustion engine, wherein the camshaft is adjustable by means of the camshaft adjuster over a Gesamtverstellbereich comprising a first Teilverstellbereich and a second Teilverstellbereich, wherein the camshaft is adjustable by means of the first rotor over the first Teilverstellbereich and the second rotor over the second Teilverstellbereich.

The phaser may be a Schwenkmotorversteller. The internal combustion engine may have a drive shaft, such as crankshaft. The internal combustion engine may have at least one camshaft. The internal combustion engine may have valves. The camshaft can be used to actuate the valves. The internal combustion engine can be used to drive a motor vehicle. The phaser may be used for location in a valvetrain of an internal combustion engine between an output shaft and a camshaft. The phaser may serve to adjust a relative rotational position between an output shaft and a camshaft of an internal combustion engine. The camshaft adjuster can be used for phase adjustment of the camshaft. The phaser may serve to adjust timing. The camshaft adjuster can be used for adjustment in the direction of early and / or late. "Early" may mean that valves of the internal combustion engine are opened early and / or closed relative to a rotational position of a crankshaft. "Late" may mean that valves of the internal combustion engine are opened and / or closed late with respect to a rotational position of a crankshaft. The camshaft phaser may have an axis of rotation about which the stator, the first rotor and the second rotor are rotatable together and rotatable relative to each other.

The stator may be drivable by an internal combustion engine. The stator may form a housing of the camshaft adjuster. The first rotor can be arranged radially inside the stator. The second rotor may be disposed radially inside the first rotor. The stator, the first rotor and the second rotor may be arranged together in a plane perpendicular to the axis of rotation.

The stator may have radially inwardly directed wings. The first rotor may have radially outwardly directed wings. The wings of the stator and the wings of the first rotor can interlock. Between the blades of the stator and the blades of the first rotor first hydraulic pressure chambers can be formed. The first pressure chambers can be acted upon by a hydraulic fluid to adjust the stator and the first rotor relative to each other. In the first end position, the blades of the stator and the wings of the first rotor can fit positively against each other. In the second end position, the wings of the stator and the wings of the first rotor can positively abut each other.

The first rotor may have radially inwardly directed wings. The second rotor may have radially outwardly directed wings. The wings of the first rotor and the wings of the second rotor can interlock. Between the wings of the first rotor and the wings of the second rotor second hydraulic pressure chambers may be formed. The second pressure chambers may be acted upon by a hydraulic fluid to adjust the first rotor and the second rotor relative to each other. In the first end position, the wings of the first rotor and the wings of the second rotor can positively abut each other. In the second end position, the wings of the first rotor and the wings of the second rotor can fit positively against each other.

The camshaft adjuster can be adjustable over the Gesamtverstellbereich between a first end position and a second end position. The first Teilverstellbereich and the second Teilverstellbereich can connect directly to each other. The first Teilverstellbereich and the second Teilverstellbereich may comprise at least approximately the same Verstellwinkelbereiche.

The Gesamtverstellbereich may have between the first Teilverstellbereich and the second Teilverstellbereich an intermediate position and the camshaft adjuster can be defined defined form-fit in the intermediate position. The intermediate position may be at least approximately centrally between the first end position and the second end position of Gesamtverstellbereichs. The intermediate position can also be referred to as middle position. In the intermediate position, the vanes of the stator and the vanes of the first rotor in the first end position of the first rotor and the vanes of the first rotor and the vanes of the second rotor in the second end position of the second rotor can fit together in a form-fitting manner.

The camshaft adjuster may be lockable in the intermediate position. The camshaft adjuster can be releasably lockable in the intermediate position in a form-fitting manner. In the intermediate position, the first rotor and the second rotor can be adjusted in their mutually facing end positions. Mutually facing end positions may face each other in the direction of rotation or in the circumferential direction of the camshaft adjuster. In the intermediate position, the first rotor can be adjusted in its first end position and the second rotor in its second end position. The first rotor and the second rotor may be lockable in their mutually facing end positions.

The camshaft adjuster may have a first locking device for locking the first rotor and a second locking device for locking the second rotor. A locking device may have a switchable locking bolt. The locking bolt can be hydraulically and / or spring-loaded for switching.

Between the stator and the first rotor first hydraulic pressure chambers and between the first rotor and the second rotor can be arranged second hydraulic pressure chambers and the first pressure chambers can be controlled by means of a first valve and the second pressure chambers by means of a second valve. The first valve may be a 4/2-way valve. The second valve may be a 4/2-way valve. The first valve and the second valve may be structurally separate from each other. The first valve and the second valve may be structurally connected. The first valve and the second valve may be designed together as a multi-channel valve.

In the case of an adjustment starting from the intermediate position, an adjustment into the first partial adjustment range or into the second partial adjustment range can optionally take place. The first Teilverstellbereich may be an early adjustment and the second Teilverstellbereich may be a later adjustment.

In addition, the object underlying the invention is achieved with a camshaft arrangement having a drive wheel, a camshaft and such a camshaft adjuster, wherein the drive wheel with the stator and the camshaft with the second rotor is rotatably connected and the first rotor between the stator and the second rotor rotatable is arranged.

The drive wheel may be a sprocket. The drive wheel may be a pulley. The drive wheel can initially be made separately structurally and subsequently connected to the stator. The drive wheel can be made in one piece with the stator. The first rotor may be loosely inserted between the stator and the second rotor. During operation of the camshaft arrangement, a power flow can take place from the drive wheel via the stator, possibly via a hydraulic fluid present in the first pressure chambers, via the first rotor, possibly via a hydraulic fluid present in the second pressure chambers and via the second rotor to the camshaft.

In summary, in other words, the invention provides, inter alia, a camshaft adjuster with central locking. The stage can be divided into two stages: adjuster 1 - adjustment range early - middle (locking in the middle position); Stage 2 - Adjustment range middle - late (locking in position middle). An activation can be carried out separately via two separate 4/2 proportional directional valves. Optionally, activation can be carried out via a "multichannel valve". The two adjusters can be nested inside each other. A stator 1 may be fixedly connected to a drive wheel. A stator 2 rotor 1 can be loosely inserted. A rotor 2 may be fixedly connected to the camshaft.

By "may" in particular optional features of the invention are referred to. Accordingly, there is an embodiment of the invention each having the respective feature or features.

With the invention, an adjustment of a one-piece camshaft is possible. A center lock is enabled and / or improved. Problems with a start-stop operation of an internal combustion engine are reduced or avoided. Undefined and / or difficult-to-define states, for example with regard to hydraulic pressure, hydraulic volume flow and / or effective forces / moments are reduced or avoided.

An embodiment of the invention will be described in more detail with reference to a figure. From this description, further features and advantages. Concrete features of this embodiment may represent general features of the invention. Features associated with other features of this embodiment may also represent individual features of the invention.

The figure shows schematically and by way of example a camshaft adjuster 1 , The camshaft adjuster 1 is used for arrangement in a valve train of an internal combustion engine between a crankshaft and a camshaft. The camshaft serves to actuate intake valves and / or exhaust valves of the internal combustion engine. Using the camshaft adjuster 1 a rotational position of the camshaft with respect to the crankshaft can be adjusted. This allows control times to be adjusted. The camshaft adjuster 1 can be adjusted over a Gesamtverstellbereich between an early position in which valves of the internal combustion engine with respect to the crankshaft are actuated early, and a late position in which valves of the internal combustion engine with respect to the crankshaft are actuated late. Between the early position and the late position, a middle position is provided. In the middle position of the camshaft adjuster 1 be locked. The camshaft adjuster 1 is locked in particular in the middle position when the internal combustion engine is out of operation, in order to achieve a clear Verarrungslage.

The camshaft adjuster 1 has an axis of rotation. The camshaft adjuster 1 has a stator 2 , a first rotor 3 and a second rotor 4 on. The stator 2 , the first rotor 3 and the second rotor 4 are each rotatable about the axis of rotation together and limited to rotate relative to each other. The stator 2 is arranged radially on the outside. The first rotor 3 is radially inside the stator 2 arranged. The second rotor 4 is radially inside the first rotor 3 arranged. In the direction of extension of the axis of rotation are the stator 2 , the first rotor 3 and the second rotor 4 arranged in a plane.

The stator 2 forms a housing of the camshaft adjuster 1 , The stator 2 has a drive wheel 5 on. The drive wheel 5 serves to drive the camshaft adjuster 1 starting from the crankshaft of the internal combustion engine by means of a traction device. Present is the drive wheel 5 a sprocket. The second rotor 4 is rotatably connected to the camshaft. The first rotor 3 is loose between the stator 2 and the second rotor 4 inserted.

The stator 2 has a ring section 6 on. The stator 2 shows wings, like 7 , on, extending from the ring section 6 extend radially inward. The first rotor 3 has a ring section 8th on. The first rotor 3 shows wings, like 9 , on, extending from the ring section 8th extend radially outward. The stator 2 and the first rotor 3 grab with their wings 7 . 9 each other. The first rotor 3 shows wings, like 10 , on, extending from the ring section 8th extend radially inward. The second rotor 4 has a ring section 11 on. The second rotor 4 shows wings, like 12 , on, extending from the ring section 8th extend radially outward. The first rotor 3 and the second rotor 4 grab with their wings 10 . 12 each other.

Between the wings 7 of the stator 2 and the wings 9 of the first rotor 3 are pressure chambers, like 13 , educated. The pressure chambers 13 can be acted upon with hydraulic oil to prevent rotation of the stator 2 and the first rotor 3 to cause relative to each other. This can be the stator 2 and the first rotor 3 be rotated in each other in both directions of rotation between a first end position and a second end position. This is an adjustment in a first Teilverstellbereich the Gesamtverstellbereichs the camshaft adjuster 1 allows. The first Teilverstellbereich is an early adjustment range. In the end positions are the wings 7 of the stator 2 and the wings 9 of the first rotor 3 each form-fitting to each other. In the figure, the second end position is shown.

Between the wings 10 of the first rotor 3 and the wings 12 of the second rotor 4 are pressure chambers, like 14 , educated. The pressure chambers 14 can be acted upon with hydraulic oil to a rotation of the first rotor 3 and the second rotor 4 to cause relative to each other. In this case, the first rotor 3 and the second rotor 4 be rotated in each other in both directions of rotation between a first end position and a second end position. This is an adjustment in a second Teilverstellbereich the Gesamtverstellbereichs the camshaft adjuster 1 allows. The second Teilverstellbereich is a later adjustment. In the end positions are the wings 10 of the first rotor 3 and the wings 12 of the second rotor 4 each form-fitting to each other. In the figure, the second end position is shown.

To a pressurization of the pressure chambers 13 . 14 to control with hydraulic oil, two separate 4/2-way proportional valves are provided in the present case.

In the late position of the camshaft adjuster 1 are the first rotor 3 and the second rotor 4 each adjusted to their first end position. In the early position of the camshaft adjuster 1 are the first rotor 3 and the second rotor 4 each adjusted in their second end position. The early position of the camshaft adjuster 1 is shown in the figure.

Between the late position and the early position of the camshaft adjuster 1 is a middle position available. In the middle position is the first rotor 3 in its first end position and the second rotor 4 adjusted to its second end position. The camshaft adjuster 1 is lockable in the middle position. These are the first rotor 3 in its second end position and the second rotor 4 Lockable in its first end position.

For locking the first rotor 3 with the stator 2 is in one of the wings 9 of the first rotor 3 a locking bolt 15 arranged. For locking the second rotor 4 with the first rotor 3 is in one of the wings 12 of the second rotor 4 a locking bolt 16 arranged. The locking bolts 15 . 16 are each displaceable between a locking position and an open position. The locking bolts 15 . 16 are each spring-loaded in the direction of their locking position. A shift to the open position may be hydraulic as soon as a predetermined pressure is exceeded.

At an adjustment of the camshaft adjuster 1 starting from the middle position can optionally be the first rotor 3 in the direction of its second end position or the second rotor 4 be twisted in the direction of its first end position.

LIST OF REFERENCE NUMBERS

1

Phaser

2

stator

3

first rotor

4

second rotor

5

drive wheel

6

ring section

7

wing

8th

ring section

9

wing

10

wing

11

ring section

12

wing

13

pressure chamber

14

pressure chamber

15

locking bolt

16

locking bolt

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 10253883 A1 [0002]
• DE 102011001301 A1 [0003, 0003]

Claims (10)

Camshaft adjuster ( 1 ) comprising a drivable stator ( 2 ), one relative to the stator ( 2 ) between a first end position and a second end position rotatable first rotor ( 3 ) and one relative to the first rotor ( 3 ) between a first end position and a second end position rotatable second rotor ( 4 ) for adjusting a camshaft of an internal combustion engine, characterized in that the camshaft using the camshaft adjuster ( 1 ) is adjustable over a Gesamtverstellbereich comprising a first Teilverstellbereich and a second Teilverstellbereich, wherein the camshaft using the first rotor ( 3 ) over the first Teilverstellbereich and using the second rotor ( 4 ) is adjustable over the second Teilverstellbereich. Camshaft adjuster ( 1 ) according to claim 1, characterized in that the Gesamtverstellbereich between the first Teilverstellbereich and the second Teilverstellbereich has an intermediate position and the camshaft adjuster ( 1 ) in the intermediate position positively defined adjustable. Camshaft adjuster ( 1 ) according to claim 2, characterized in that the camshaft adjuster ( 1 ) is lockable in the intermediate position. Camshaft adjuster ( 1 ) according to at least one of the claims, characterized in that the Gesamtverstellbereich between the first Teilverstellbereich and the second Teilverstellbereich has an intermediate position and in the intermediate position of the first rotor ( 3 ) and the second rotor ( 4 ) are adjusted in their mutually facing end positions. Camshaft adjuster ( 1 ) according to at least one of the preceding claims, characterized in that the first rotor ( 3 ) and the second rotor ( 4 ) are lockable in their mutually facing end positions. Camshaft adjuster ( 1 ) according to at least one of the preceding claims, characterized in that the camshaft adjuster ( 1 ) for locking the first rotor ( 3 ) a first locking device ( 15 ) and for locking the second rotor ( 4 ) a second locking device ( 16 ) having. Camshaft adjuster ( 1 ) according to at least one of the preceding claims, characterized in that between the stator ( 2 ) and the first rotor ( 3 ) first hydraulic pressure chambers ( 13 ) and between the first rotor ( 3 ) and the second rotor ( 4 ) second hydraulic pressure chambers ( 14 ) and the first pressure chambers ( 13 ) by means of a first valve and the second pressure chambers ( 14 ) can be controlled by means of a second valve. Camshaft adjuster ( 1 ) according to at least one of the preceding claims, characterized in that the first Teilverstellbereich an early adjustment and the second Teilverstellbereich is a later adjustment. Camshaft adjuster ( 1 ) according to at least one of the preceding claims, characterized in that the Gesamtverstellbereich between the first Teilverstellbereich and the second Teilverstellbereich has an intermediate position and in an adjustment, starting from the intermediate position optionally an adjustment in the first Teilverstellbereich or in the second Teilverstellbereich. Camshaft arrangement comprising a drive wheel ( 5 ), a camshaft and a phaser ( 1 ) according to at least one of the preceding claims, wherein the drive wheel ( 5 ) with the stator ( 2 ) and the camshaft with the second rotor ( 4 ) is rotatably connected and the first rotor ( 3 ) between the stator ( 2 ) and the second rotor ( 4 ) is arranged rotatable.

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