DE102018115722A1 - Rotor for a hydraulic camshaft adjuster, camshaft adjuster with the rotor and method for manufacturing the rotor - Google Patents

Abstract

There are known rotors for hydraulic camshaft adjusters, which are made from a plurality of punched sheets stacked one on top of the other. Individual plates can be provided with openings for the formation of oil channels. For this purpose, a rotor 2 for a hydraulic camshaft adjuster 1 is proposed with a rotor core 7, the rotor core 7 having a plurality of rotor plates 11, the rotor plates 11 in the axial direction with respect to a rotor axis R are stacked, with at least one of the rotor plates 11 having a channel section 9 for guiding a hydraulic fluid, with a rotor sleeve 8, the rotor core 7 being at least partially covered by the rotor sleeve 8, the rotor sleeve 8 having at least one through opening 10 for fluidic connection of the duct section 9 with a working chamber 6 formed by a stator 3, the rotor sleeve 8 having at least one shaping section 13, the shaping section 13 for forming the through opening 10 being molded into the duct section 9 and the through opening 10 through the shaping section tt 13 is extended in the direction of the channel section 9.

Description

The invention relates to a rotor for a hydraulic camshaft adjuster with the features of the preamble of claim 1. Furthermore, the invention relates to a hydraulic camshaft adjuster for a vehicle with the rotor and a method for producing the rotor.

There are known rotors for hydraulic camshaft adjusters, which are made from a plurality of punched sheets stacked one on top of the other. Individual sheets can be provided with openings for the formation of oil channels. The sheets can be joined together, for example, by clinching, laser spot welding or diffusion welding.

The publication DE 100 80 917 C1 discloses a device for adjusting the angle of rotation of a camshaft relative to the crankshaft of a reciprocating piston internal combustion engine, the device being designed as a rotary vane adjuster or vane cell adjuster which has a stator and a rotor arranged coaxially to the latter, the vanes of which in oil-pressure chambers formed by radial walls of the stator by oil pressure are pivotable. The stator and the rotor each consist of a package of stator boards or rotor boards produced by stamping and firmly connected to one another.

The post-published publication DE 10 2018 111 094.4 by the applicant, discloses a hydraulic camshaft adjuster, in particular of the vane cell type, with a base body from which the vanes protrude radially outwards, which can be pivotably arranged in a working chamber / pressure chamber formed by a stator, the rotor being fixed by a multiplicity of plate-like interconnected rotor plates is formed. A sheath surrounding the rotor laminations is arranged at least on a radial and / or axial outside of the rotor.

The invention has for its object to propose a rotor for a hydraulic camshaft adjuster, which is characterized by an improved operating behavior.

This object is achieved by a rotor with the features of claim 1, a camshaft adjuster with the features of claim 7 and a method with the features of claim 9. Preferred or advantageous embodiments of the invention result from the subclaims, the following description and / or the attached figures.

The invention relates to a rotor which is designed and / or suitable for a hydraulic camshaft adjuster. In particular, the rotor can be connected in a rotationally fixed manner to a camshaft, preferably an intake or an exhaust camshaft. The rotor can be pivoted about a rotor axis in order to adjust the camshaft, and at the same time the camshaft is rotated. The rotary movement of the rotor is particularly preferably generated hydraulically.

The rotor has a rotor core which has a plurality of rotor plates. The rotor sheets can be connected to one another in a material-locking and / or form-locking and / or non-positive manner. The rotor plates are preferably designed as stamped components and / or fineblanking components. The rotor plates are preferably arranged coaxially to the rotor axis and stacked on top of one another in the axial direction. The rotor plates preferably have the same or identical outer contour. The rotor laminations are preferably flush with one another on a radial outside. In particular, the rotor is designed as a punch-packaged rotor.

Furthermore, at least or exactly one of the rotor plates has a channel section which is designed and / or suitable for guiding a hydraulic fluid. In particular, the channel section ends in the axial and / or radial direction with respect to the rotor axis in an outer surface of the rotor core. The rotor core can have further duct sections, the duct sections being partially connected to one another in terms of flow and / or with a central valve.

The rotor has a rotor shell. The rotor shell is preferably designed as a metal shell, so that a dimensionally stable shell with a smooth surface is formed. The metal shell is particularly preferably designed as a steel component. Alternatively or optionally additionally, the rotor shell can be manufactured by a sintering or deep-drawing process. The rotor shell preferably forms at least approximately a contour partner to the rotor core.

The rotor core is encased at least in sections by the rotor sleeve. In particular, at least the radial outside of the rotor core is encased with the rotor shell, preferably completely. Optionally, in addition, the rotor shell can be arranged on at least or exactly one axial end face of the rotor core, the other axial end face preferably being formed without a shell. The one axial end face of the rotor can be formed by the rotor shell and the other axial end face can be formed by one of the rotor plates. In particular, however, it is also conceivable for the rotor shell to completely encase the rotor core, with in particular both axial end faces of the rotor being formed by the rotor shell

The rotor shell has at least or exactly one through opening which is designed and / or suitable for the fluidic connection of the channel section to a working chamber formed by a stator. The channel section is in direct connection with the through opening. In particular, the through opening is designed as an opening or a bore. The passage opening is preferably introduced radially into the rotor shell with respect to the axis of rotation. Alternatively or optionally in addition, the and / or a further through opening can be introduced axially with respect to the axis of rotation into the rotor casing, in particular into the section of the rotor casing forming the end face. In particular, the through opening has an elongated shape and / or is designed as an elongated hole.

Within the scope of the invention, it is proposed that the rotor shell have at least or exactly one forming section. The forming section is molded into the channel section to form the through opening. In particular, the forming section is adapted or molded to the opening cross section of the channel section. The through opening or the shaping section particularly preferably has a similar opening cross section and / or a similar opening contour as the channel section. The forming section has a reduced material thickness compared to the remaining part of the rotor shell.

The through opening is extended by the forming section in the direction of the channel section. In particular, the shaping section extends at least in sections within the channel section. The shaping section is preferably collar-like in the direction of the channel section, in particular as a cylindrical collar extension. The shaping section is particularly preferably in a form-fitting manner against the channel section.

The advantage of the invention is that the shaping section forms an overlap between the rotor core and the rotor shell in a transition region between the through opening and the channel section. As a result, the formation of a leak in the transition region can be significantly reduced or even avoided, as a result of which the risk of the rotor malfunctioning is significantly reduced or prevented. A rotor with improved operating behavior is thus proposed, and operational reliability is also increased.

In a preferred implementation it is provided that the forming section is formed into the channel section by a forming process. In particular, the through-opening has a smaller opening cross-section than the channel section before the reshaping, the through-opening being widened as part of the reshaping process. The excess material flows in the direction of the channel section, as a result of which the shaping section is plastically shaped. The shaping section is preferably formed by pulling the collar.

In a further specification, it is provided that the channel section extends in the radial direction with respect to the rotor axis between two rotor plates. In particular, the channel section is delimited in the axial direction with respect to the rotor axis by the two adjacent rotor plates. The two adjacent rotor laminations are preferably arranged at a distance from one another in the axial direction, so that the channel section is defined by the distance formed. The forming section bears against the two rotor laminations, in particular in a form-fitting manner, in the axial direction with respect to the rotor axis.

In a concrete constructive implementation of the invention, it is provided that the at least one channel section is formed by a recess in at least or exactly one of the rotor plates. The cutout is particularly preferably designed as a radial cutout or incision. Alternatively, however, the recess can also be designed as a radially extending recess in one of the rotor plates. The rotor plate provided with the protrusion is particularly preferably arranged between two further rotor plates, so that the channel section is delimited in the axial and / or radial direction and / or in the circumferential direction with respect to the rotor axis by the surrounding rotor plates. The shaping section lies in the circumferential direction on the rotor plate having the recess. The shaping section thus bears against the rotor plates, preferably in a form-fitting and / or flat and / or sealing manner, both in the axial direction and in the circumferential direction.

In a further development it is provided that the rotor core is held captively in the rotor shell by the forming section, in particular in the axial direction with respect to the rotor axis. In particular, the shaping section is deformed after the rotor core has been inserted into the rotor shell, so that the rotor core is fixed against slipping in the rotor shell. The forming section can preferably be molded into the channel section in such a way that the forming section is preferably in contact with the rotor laminations without play and / or in a flat manner. In particular, the forming section can form a frictional connection with the rotor core, so that the rotor core is clamped in the rotor shell. The shaping section thus serves to connect the rotor shell to the stator core, so that an additional joining process can be dispensed with the rotor can be manufactured significantly cheaper.

In a further embodiment it is provided that the rotor sleeve bears against a radial and / or axial outer surface of the rotor core. In particular, the rotor shell lies over the entire surface and / or without a gap on the axial and / or radial outer surface of the rotor core. The rotor core is preferably received in the radial and / or axial direction in a form-fitting and / or non-positive manner in the rotor casing. The jacket section particularly preferably lies on the radial outer surface and / or the end section on the axial outer surface of the rotor core.

Another object of the invention relates to a hydraulic camshaft adjuster for a vehicle with the rotor according to the invention and with a stator. The rotor is arranged in the stator, preferably coaxially and / or concentrically, and can be rotated relative to the stator in a defined angular range. In particular, the outside of the rotor, preferably the rotor shell, forms a bearing and / or sealing surface with the stator. In particular, the camshaft adjuster has the function of adjusting the phase position of the camshaft relative to the phase position of a crankshaft of the vehicle.

In a preferred embodiment of the hydraulic camshaft adjuster, the rotor has a plurality of wing sections which extend radially on its outer circumference. The wing sections are preferably formed by the rotor sheets and are encased on their radial outer side by the rotor sleeve. The stator has a plurality of working chambers, one of the wing sections extending at least in sections within the working chamber, so that the working chamber is divided into two chamber sections. The stator preferably has a plurality of web sections projecting radially inwards, the working chamber being delimited in the circumferential direction by two adjacent web sections. In particular, the web sections each form an end stop for one of the wing sections in the circumferential direction. The rotor with the rotor sleeve lies particularly preferably in the radial direction on an inner circumference of the stator.

The rotor of the hydraulic camshaft adjuster preferably has a first and a second channel section for each working chamber, the first channel section being connected in terms of flow technology to the first chamber section and the second channel section to the second chamber section. In particular, the hydraulic medium can flow via the channel sections into the respective chamber section, so that an adjustment of the rotor position is implemented hydraulically. The channel sections connected to the working chambers are particularly preferably connected in a fluid-conducting manner to the respective chamber section via a separate through-opening, the rotor sleeve being molded into the corresponding channel sections via a separate shaping section.

Another object of the invention relates to a method for producing the rotor according to the invention. In one manufacturing step, a plurality of rotor laminations for forming the rotor core are stacked or layered on one another in the axial direction with respect to the rotor axis. In particular, the rotor laminations are stacked to form a rotor laminated core. For example, the rotor laminations can be connected to one another for this purpose.

In a further manufacturing step, the rotor core is encased at least in sections with the rotor sleeve. In particular, the rotor sleeve is pushed onto the rotor core coaxially and / or concentrically, so that the rotor core is received in a form-fitting manner in the rotor sleeve. Subsequently, the forming section (s), in particular in terms of forming technology, is molded into the channel section (s) of the rotor core, in particular plastically formed, so that the through opening is formed and extended in the direction of the respective channel section.

In a concrete implementation, the forming section is shaped radially from the outside in relation to the rotor axis by a forming tool in the direction of the channel section. In particular, the forming tool can be designed as a stamp. The rotor sleeve is pre-punched to form the through opening, the forming tool for forming the forming section preferably being pressed through the through opening from the outside in the direction of the channel section. The shaping tool has a larger diameter than the through opening, the diameter of the through opening being widened by the shaping tool during the shaping process and the shaping section being formed.

• 1 eine perspektivische Darstellung eines hydraulischen Nockenwellenverstellers;
• 2 eine Schnittdarstellung eines Rotors des Nockenwellenverstellers aus 1 als ein Ausführungsbeispiel der Erfindung;
• 3a, b jeweils eine perspektivische Teilansicht des Rotors aus 2 vor und nach einem Umformprozess.

Further features, advantages and effects of the invention result from the following description of preferred exemplary embodiments of the invention. Show:

• 1 a perspective view of a hydraulic camshaft adjuster;
• 2 a sectional view of a rotor of the camshaft adjuster 1 as an embodiment of the invention;
• 3a, b each a partial perspective view of the rotor 2 before and after a forming process.

1 shows a perspective view of a hydraulic camshaft adjuster 1 , which is designed and / or suitable for example for adjusting a camshaft of an internal combustion engine of a vehicle. The camshaft adjuster 1 has a rotor 2 and a stator 3 , with the rotor 2 coaxial in the stator 3 recorded and relative to the stator 3 about a rotor axis R is pivotable in a certain angular range. At the same time, the camshaft is rotated so that its phase position can be adjusted relative to the phase position of a crankshaft of the internal combustion engine. For example, the rotor 2 for this purpose connected to the camshaft in a rotationally fixed manner.

The rotor 2 has on its outer periphery a plurality of radially outward wing sections 4 and the stator 3 several web sections directed radially inwards 5 on. Two adjacent web sections define each 5 a working chamber in the circumferential direction 6 , each with one of the wing sections 4 to the work chamber 6 extends and the working chamber 6 into a first and second chamber section 6a , b divided. If the rotor turns 2 around the rotor axis R form the web sections 5 an end stop for the rotor 2 , so that the angle of rotation of the rotor 2 is limited.

The rotor 2 has a rotor core 7 and a rotor shell 8th on, with the rotor core 7 at least on its radial outside through the rotor shell 8th is encased. The rotor core 7 is in the radial direction with respect to the rotor axis R form-fitting within the rotor shell 8th added. For example, the rotor shell 8th formed as a steel shell, the rotor 2 over the rotor shell 8th on a radial inside of the stator 3 is applied. For example, by the radial outer surface of the rotor shell 8th a storage area opposite the stator 3 educated.

The rotor 2 has several channel sections 9 on which the rotor core 7 at least in sections in the radial and / or axial direction with respect to the rotor axis R push through. The rotor core points 7 several first and second channel sections 9a . b on, each via a through opening 10 with the working chambers 6 are fluidically connected. There is one per working chamber 6 a first and a second channel section 9a . b provided, the first channel section 9a with the first chamber section 6a and the second channel section 9b with the second chamber section 6b fluidically connected. For example, a hydraulic fluid for controlling the rotor 2 from a central valve via the duct sections 9a . b in the respective chamber section 6a . b flow in, by increasing and / or reducing a hydraulic pressure in the working chamber 6 or in at least one of the chamber sections 6a . b , a rotation of the rotor 2 around the rotor axis R is implemented.

2 shows a longitudinal section of the rotor 2 from the 1 along the rotor axis R through one of the channel sections 9 , in particular one of the first or second channel section 9a . b , as an embodiment of the invention. The rotor core 7 has several in the axial direction with respect to the rotor axis R stacked rotor plates 11 on. The rotor sheets 11 are designed, for example, as stamped sheet metal parts and are flush with one another on a radial outside. For example, the rotor laminations can be integrally connected to one another.

The rotor shell 8th has a jacket section 8a and a forehead section 8b on. The forehead section 8b connects to the jacket section in the radial direction 8a and extends radially inward over the entire radial end face of the rotor core 7 or the outermost rotor plate 11 , For example, the rotor shell 8th formed as a deep-drawn component, the jacket section 8a and the forehead section 8b are integrally connected. The jacket section 8b extends completely over the radial outside of the stator core 7 , the jacket section 8a over the entire axial width on an outer surface of the rotor core 7 or the rotor plates 11 , in particular free of play.

Some of the rotor plates 11 can be used to form the channel section 9 a recess 12 have, which are in the radial direction with respect to the rotor axis R extend different distances. For example, the recesses 12 through free cuts in the respective rotor plate 11 educated. Here are the rotor plates 11 with the recesses 12 arranged such that the channel section 9 at least in the axial direction by adjacent rotor plates 11 is surrounded or limited. The cutouts 11 are introduced in such a way that several cutouts 12 correspond with each other and the channel section 12 is formed.

The rotor shell 8th has a forming section 13 on, the forming section 13 Technically, for example by pulling the collar, into the channel section 9 is molded. The forming section 13 for axially securing the rotor core 7 in the rotor shell 8th serve, causing the rotor core 7 captive in the rotor shell 8th is held. It is therefore possible to use an additional joining method, for example diffusion welding, to connect the rotor core 7 with the rotor shell 8th to be dispensed with.

The forming section 13 is designed as a collar extension, which is the through opening 10 radially in the direction of the channel section 9 extended. The forming section is located here 13 form-fitting to the channel section 9 limiting rotor sheets 11 so that through the forming section 13 an overlap of the rotor shell 8th in the transition area between the channel section 9 to the through opening 10 is generated. Thus the tightness of the rotor 2 can be significantly increased because of the formation of leaks in the transition area and an associated malfunction of the rotor 2 can be significantly reduced or even prevented.

3a . b show a partial perspective view of the rotor 2 out 2 before and after a forming process to form the forming section 13 , The 3a shows the rotor 2 before the forming process, the through opening 10 is prepunched. In particular, the pre-punched through opening 10 formed as an elongated opening, in particular an elongated hole, the opening cross section or diameter of the pre-perforated through opening 10 is smaller than the opening cross section or diameter of the channel section 9 , As part of a manufacturing process, the rotor core 7 in the axial direction with respect to the rotor axis R so far in the rotor shell 8th inserted until the prepunched through opening 10 congruent to the channel section 9 is arranged.

3b shows the rotor 2 after the forming process, the through opening 10 is expanded by a shaping tool, for example a stamp, and the shaping section 13 is formed. For this purpose, the forming tool is moved radially from the outside in the direction of the channel section 9 driven, with a material flow towards the channel section 9 takes place and the forming section 13 to the inner contour of the channel section 9 is molded.

LIST OF REFERENCE NUMBERS

1

Phaser

2

rotor

3

stator

4

wing sections

5

web sections

6

working chamber

6a

first chamber section

6b

second chamber section

7

rotor core

8th

rotor shell

8a

shell section

8b

front section

9

channel section

9a

first channel section

9b

second channel section

10

Through opening

11

rotor laminations

12

recesses

13

forming section

R

rotor axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• DE 10080917 C1 [0003]
• DE 102018111094 [0004]

Claims (10)

Rotor (2) for a hydraulic camshaft adjuster (1) with a rotor core (7), the rotor core (7) having a plurality of rotor plates (11), the rotor plates (11) in the axial direction with respect to a rotor axis (R) are stacked, with at least one of the rotor sheets (11) having a channel section (9) for guiding a hydraulic fluid, with a rotor casing (8), the rotor core (7) being encased at least in sections by the rotor casing (8), the rotor casing ( 8) has at least one through opening (10) for fluidic connection of the channel section (9) to a working chamber (6) formed by a stator (3), characterized in that the rotor shell (8) has at least one forming section (13), the Forming section (13) for forming the through opening (10) is formed in the channel section (9) and the through opening (10) through the forming section (13) in the direction of the channel section (9) is elongated. Rotor (2) after Claim 1 , characterized in that the forming section (13) is formed into the channel section (9) by a forming process. Rotor (2) after Claim 1 or 2 , characterized in that the channel section (9) extends in the radial direction with respect to the rotor axis (R) between two adjacent rotor plates (11), the forming section (13) in the axial direction with respect to the rotor axis (R) two rotor plates (11). Rotor (2) according to one of the preceding claims, characterized in that the at least one channel section (9) is formed by a recess (12) in at least one of the rotor laminations (11), the shaping section (13) in the circumferential direction at which the recess (12) having rotor plate (11). Rotor (2) according to one of the preceding claims, characterized in that the rotor core (7) is held captively in the motor casing (8) by the shaping section (13). Rotor (2) according to one of the preceding claims, characterized in that the rotor sleeve (2) lies flat against a radial and / or axial outer surface of the rotor core (7). Hydraulic camshaft adjuster (1) for a vehicle with the rotor (2) according to one of the preceding claims and with a stator (3), characterized in that the rotor (2) is arranged in the stator (3) and relative to the stator (3 ) can be rotated within a defined angular range. Hydraulic camshaft adjuster (1) after Claim 7 , characterized in that the rotor (2) has a plurality of wing sections (4) which extend radially on its outer circumference and the stator (3) has a plurality of working chambers (6), one of the wing sections (4) each being located at least in sections within one of the Working chambers (6) extends so that the working chamber (6) is divided into two chamber sections (6a, b), the rotor (2) per working chamber (6) having a first and a second channel section (9a, b), each of which first channel section (9a) is connected to the first chamber section (6a) and the second channel section (9b) is connected to the second chamber section (6b) in terms of flow technology. A method of manufacturing the rotor (2) according to any one of claims 1 to 6, in which: - A plurality of rotor plates (11) to form a rotor core (7) are stacked in the axial direction with respect to a rotor axis (R); - The rotor core (7) is covered with a rotor sleeve (8) at least in sections; - A forming section (13) is molded into a channel section (9) of the rotor core (7), so that a through opening (10) is formed and extended in the direction of the channel section (9). Procedure according to Claim 9 , characterized in that the forming section (13) is shaped radially from the outside in relation to the rotor axis (R) by a forming tool in the direction of the channel section (9).

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