DE102008057570A1 - Phase shifter for device to adjust phasing of shaft, particularly cam shaft in combustion engine, has rotor and stator, where rotor is supported in stator in rotary shifting manner - Google Patents

Abstract

The phase shifter (10) has a rotor (14) and a stator (12), where the rotor is supported in a stator in a rotary shifting manner and is coupled with the stator for torque transmission. The phase shifter is formed as hydraulic rotary piston shifter that is to be actuated. The rotor and the stator are manufactured by the powdered metallurgical injection molding. The rotor and the stator have a core hardness as per Brinell of German Institute for Standardization European International Organization for Standardization 6506.

Description

Field of the invention

The The invention relates to a phaser for a device for adjusting the phase position of a shaft, in particular for adjusting the phase angle of a camshaft in an internal combustion engine, wherein the phaser acting as hydraulically operated Rotationskolbenversteller is formed, one with a drive means to be coupled stator and a rotatably connected to the shaft Rotor having rotatably mounted in the stator and coupled with this for torque transmission. Of Furthermore, the invention relates to a device for adjusting the phase angle of a wave, with such a phaser Is provided.

One Phase adjuster of the type mentioned in particular Devices for adjusting the phase position of a camshaft in an internal combustion engine used. By targeted adjustment the phasing of the camshaft, it is possible the compression process and ejection operation during the combustion process in terms of fuel efficiency.

From the DE 100 20 119 A1 a device is known with which the phase angle of the camshaft of an internal combustion engine with the aid of a Phasenverstellers designed as Rotationskolbenversteller can be selectively changed in order to reduce fuel consumption.

Of the designed as Rotationskolbenversteller trained phasing hydraulically operated, which is particularly precise Production of the individual components of the phase adjuster, in particular the on the stator and rotor formed sealing surfaces required makes a long-lasting use and a precise adjustment to reach the phase position.

Of the Rotor and the stator are therefore either by machining made of the full or executed as sintered parts, the subsequent by machining in their final Be brought form. However, in both ways of production is Disadvantage that the required processing steps than the mass parts designed components of the phase adjuster material and time consuming are.

outgoing From the above-mentioned prior art, it is the task of Invention to improve the phase adjuster mentioned above in such a way that the phaser compared to the prior art in Consistently high guarantee of operational safety easier to manufacture.

Disclosure of the invention

According to the invention this object by a device with the features of claim 1 and in particular solved in that the rotor and / or the stator near net shape by powder metallurgical injection molding have been or is. Furthermore, the task is through a device for adjusting the phase position of a wave solved, the equipped with a phase adjuster according to the invention is.

The Powder metallurgical injection molding, also MIM process (from Called Metal Injection Molding) has been known for some time. However, it is assumed that due to the specifics This manufacturing process compared the thus manufactured components with building identical components produced by conventional manufacturing processes As machining methods have been manufactured, a lower strength exhibit. Furthermore, it has been assumed in the past that the powder metallurgical injection molding not for particularly precise components to be manufactured, such as components hydraulically operated adjusting units would be suitable. Surprisingly However, it turned out that in by the powder metallurgy Injection molding manufactured components by subsequent treatment steps such as hardening or tempering similarly high strength values can be achieved, as in conventionally manufactured components. Also, a subsequent Feinstbearbeiten example of gears or sealing surfaces by machining processes, like fine milling, grinding, etc., possible.

In the case of the phase adjuster according to the invention, it has been found that, in particular, the rotor and / or the stator are particularly suitable or suitable for powder-metallurgical injection molding. The rotor manufactured in this way, which is also provided with a plurality of channels and shaped elements in the prior art for functional reasons, can be finished in its final shape by powder metallurgical injection molding almost without further processing. The same applies to the stator, which must be equipped for the drive with appropriate form elements, such as gears, which can also be produced close to the final shape by powder metallurgy injection molding, the required effort for the production compared to the prior art is significantly lower. By manufacturing the rotor and / or stator according to the invention as a powder metallurgical injection molded part not only the required material cost is reduced compared to the prior art, but also shortens the necessary production time, since a close to the final production of the components is made possible without the so-manufactured components a comprehensive post-processing, for example by spa need to be subjected to the same procedure. Furthermore, it is also possible, without additional effort, specifically to form recesses and depressions to save weight on the components.

Further Advantages of the invention will become apparent from the following description, the drawing and the dependent claims.

at a particularly preferred embodiment of the invention Phase adjuster is the rotor and / or the stator by heat treatment cured to the required wear resistance sure. Is the rotor or the stator as powder metallurgical Injection molded part is particularly preferred proposed, the component by induction hardening and optionally subsequent tempering, heat treatment.

If the rotor or the stator has been produced by powder metallurgical injection molding, the rotor or the stator should have a core hardness according to Brinell of at least 120 HB 2.5 / 62.5 (determined according to DIN EN ISO 6506 ) exhibit.

To the Coupling of the drive means is preferably a circumferential toothing on the stator provided, which comes into engagement with the drive means. As drive can gears or pinions, but also toothed belts and timing chains are used. One for docking the drive means sufficient positional and dimensional accuracy of the peripheral teeth but at the same time the effort in the production designed as a powder metallurgy injection molded part To keep the stator as small as necessary is the peripheral toothing by machining, in particular by milling and Sanding, slightly reworked.

In order to ensure sufficient wear resistance of the circumferential toothing, the peripheral toothing preferably has a hardness of Vickers of at least 600 HV 0.1 (determined according to the DIN EN ISO 6507 ) at the tooth tip and a Vickers hardness of at least 500 HV 0.1 (also determined according to DIN EN ISO 6507 ) on the tooth base.

Of Another is in which as powder metallurgical injection molded part trained components of the phase adjuster proposed, only the serving as sealing surfaces by cutting Machining machining while other sections the components, so the rotor and the stator, remain unprocessed.

When particularly suitable material for the production of Rotor and stator as powder metallurgical injection molded part has shown a low-alloy steel that has a carbon content from 0.6 to 0.8% and a copper content of 1.0 to 2.0%. The low-alloyed steel is both easy to process and on the other hand by heat treatment subsequently to harden. In general, however, others can Materials are used, which are usually performance-specific Characteristics such as strength, processability, heat-treatability, Repossibility, etc., are selected.

Around the weight of the phase adjuster according to the invention To keep as low as possible, it is also proposed formed as a powder metallurgy injection molded part Rotor having a plurality of outwardly extending from the center Having drive channels, at least at its end faces with at least one recess and / or between the Ansteuerkanälen with at least one breakthrough ending at the two end faces to provide. The recesses and apertures may optionally also be designed graduated. The only thing that matters is that the strength the components through the recesses and breakthroughs is not affected. The recesses and breakthroughs are designed and arranged on the rotor that they are outside lie the main stress lines, so that the moment of resistance of the Rotor is not adversely affected. The recess and / or let the breakthrough or can be without great Effort in powder metallurgy injection already form, whereby a material or weight savings achieved can be without the rotor yet another extensive chipping Processing must be subjected.

According to one In another aspect, the invention relates to a device for adjustment the phase angle of a shaft, wherein the device with an inventive Phase adjuster is equipped. As a particularly preferred application is the with the phase adjuster according to the invention equipped device for adjusting the phase position a camshaft used in an internal combustion engine. Indeed The device is generally also suitable for phase adjustment other couplings between a drive means and a shaft.

embodiment

Short description of the drawing

following the invention is based on an embodiment below Reference to the accompanying drawings closer explained. It shows:

1 a section along the line AA the 2 by a Phasenver invention actuator for a device for adjusting the phase position of a camshaft;

2 a section along the line BB of 1 through the phaser;

3 a perspective view of a stator of the phaser; and

4 a perspective view of a rotor of the phase adjuster.

In the 1 and 2 is a partially cut front view and in a sectional side view of a phaser 10 shown, which is used in a device for adjusting the phase position of a camshaft in an internal combustion engine.

The phaser 10 has a stator 12 and one in the stator 12 used rotor 14 on. The rotor 14 is pushed onto a camshaft, not shown, and rotatably connected thereto. The stator 12 is provided by two at its two end faces provided sealing cover 16 and 18 sealed fluid-tight, the camshaft by one on the sealing lids 16 and 18 concentrically provided opening protrudes. The rotor 14 can, as will be explained later, with the aid of a hydraulic control relative to the stator 12 be rotated about the axis of rotation R of the camshaft to adjust the phase at which the camshaft opens or closes the valves of the engine.

The stator 12 is annular and has on its peripheral outer surface a peripheral toothing 20 which is engaged with a timing belt or a timing chain when the phaser 10 is in use. In particular 3 It is easy to see where the stator is 12 is shown in perspective, the stator has 12 on its inner peripheral surface a total of five radially inwardly projecting, identically formed elevations 22 , Each of the surveys 22 is with an axial through hole 24 provided by a fixing screw 26 sticks out, with the two sealing lids 16 and 18 at the stator 12 are releasably secured (see. 2 ).

The radially innermost surface of each elevation 22 is in cross section transverse to the axis of rotation R of the stator 12 each considered circularly rounded, wherein the inner radius of the surface at least approximately the outer radius of the rotor 14 equivalent. The inside arranged surfaces of the elevations 22 serve with inserted rotor 14 as sealing surfaces on the outer circumferential surface of the rotor 14 , where the surveys 22 together with the outer surface of the rotor 14 as well as the two sealing lids 16 and 18 pressure chambers 28 limit.

The rotor 14 who in 4 also shown in perspective view, has on its peripheral surface a total of five evenly distributed over the circumference slots 30 , each extending in the radial direction. In every slot 30 is a grand piano 32 attached (cf. 1 and 2 ) extending radially outward from the rotor 14 extends. Between the slots 30 are radially outwardly extending channels 34 and 36 provided, wherein between each two adjacent slots 30 two channels each 34 and 36 are arranged, viewed in the direction of the rotation axis R offset from each other. Furthermore, at the two end faces of the rotor 14 For weight savings each recesses 38 provided, which are connected in sections and breakthroughs 40 form. The recesses 38 and breakthroughs 40 are doing so on the rotor 14 designed that the strength of the rotor 14 is not affected. Optionally, the recesses 38 and breakthroughs 40 also graduated and be more profound than in 4 shown.

In the assembled state (cf. 1 and 2 ), one wing each 32 into one of the pressure chambers 28 and subdivides the pressure chamber 28 in two chamber sections 42 and 44 , Every wing 32 is dimensioned in the radial direction so that it sealingly on one of the cross-section transverse to the rotation axis R considered circular rounded inner peripheral sections 46 the pressure chambers 28 can slide along.

The chamber sections 42 every pressure chamber 28 each stand with one of the channels 34 in fluid communication, while the other chamber sections 44 every pressure chamber 28 each with one of the other channels 36 in fluid communication.

The channels 34 and 36 are connected to a hydraulic control (not shown), which is used to adjust the rotor 14 inside the stator 12 over the channels 34 and 36 a hydraulic medium in the chamber sections 42 and 44 promotes or withdraws from these. Should the rotor 14 opposite the stator 12 for example, in the clockwise direction 1 be adjusted, the hydraulic medium through the channels 34 into the chamber sections 42 promoted, while at the same time in the chamber sections 44 contained hydraulic medium through the channels 36 from the chamber sections 44 is encouraged. Should the rotor 14 in contrast to the stator 12 counterclockwise the

1 be twisted, the hydraulics medium through the channels 36 into the chamber sections 44 promoted while in the chamber sections 42 contained hydraulic medium through the channels 34 is deducted from these. This is the rotor 14 hydraulically clamped and can very quickly inside the stator 12 be adjusted, thereby increasing the relative position of the rotor 14 rotatably connected camshaft relative to the stator 12 changed and in this way the time at which the camshaft, the valves of the engine opens or closes are selectively adjusted.

According to the invention is in the phase adjuster 10 the stator 12 near-net shape by powder metallurgy injection of a low alloy steel having a carbon content of 0.6 to 0.8% and a copper content of 1.0 to 2.0%. This has already been the surveys 22 and the through holes 24 formed into its final shape. The stator made by powder metallurgy injection molding 12 already has a Brinell core hardness of at least 120 HB 2.5 / 62.5 ( DIN EN ISO 6506 ). To increase the surface hardness became the stator 12 then hardened and tempered by induction hardening. After the annealing, the were at the surveys 22 provided sealing surfaces, the inner peripheral sections 46 and the peripheral teeth 20 Finished by machining Feinstbearbeitung to their respective final shape. By hardening has the peripheral teeth 20 a Vickers hardness of at least 600 HV 0.1 ( DIN EN ISO 6507 ) at the tooth tip and a Vickers hardness of at least 500 HV 0.1 ( DIN EN ISO 6507 ) at the base of the tooth.

In the same way is also the rotor 14 near-net shape by powder metallurgy injection of a low alloy steel having a carbon content of 0.6 to 0.8% and a copper content of 1.0 to 2.0%. There were all slots 30 and channels 34 and 36 as well as the recesses 38 and breakthroughs 40 finally formed. The rotor produced by powder metallurgy injection molding 14 has a Brinell core hardness of at least 120 HB 2.5 / 62.5 ( DIN EN ISO 6506 ) on. The rotor 14 was then hardened by induction hardening and then angeled. After tempering, the outer circumferential surface of the rotor became 14 that acts as a sealing surface to the elevations 22 serves, finished by machining Feinstbearbeitung. By hardening and tempering the rotor points 14 at its sealing surfaces a Vickers hardness of at least 600 HV 0.1 ( DIN EN ISO 6507 ) on.

By forming the stator 12 and the rotor 14 As powder metallurgical injection molded parts there are various advantages. First, the production of both the stator 12 as well as the rotor 14 considerably simplified compared to the conventional production methods. So can the stator 12 and the rotor 14 already be brought into a near-net shape in one work step. Furthermore, it is possible for the first time, recesses without great effort 38 and breakthroughs 40 on the rotor 14 form, saving not only material, but also the weight of the phaser 10 can be reduced. Furthermore, it is easily possible to additionally harden and temper the two components by suitable treatment steps in order to achieve the desired wear resistance. Also, a subsequent Feinstbearbeitung of sealing surfaces, gears and the like is still possible.

10

phaser

12

stator

14

rotor

16

sealing cover

18

sealing cover

R

axis of rotation

20

splines

22

survey

24

Through holes

26

mounting screws

28

pressure chambers

30

slots

32

wing

34

channels

36

channels

38

recesses

40

breakthroughs

42

chamber sections

44

chamber sections

46

Inner peripheral sections

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10020119 A1 [0003]

Cited non-patent literature

• - DIN EN ISO 6506 [0012]
• - DIN EN ISO 6507 [0014]
• - DIN EN ISO 6507 [0014]
• - DIN EN ISO 6506 [0033]
• - DIN EN ISO 6507 [0033]
• - DIN EN ISO 6507 [0033]
• - DIN EN ISO 6506 [0034]
• - DIN EN ISO 6507 [0034]

Claims (9)

Phase adjuster for a device for adjusting the phase position of a shaft, in particular for adjusting the phase position of a camshaft in an internal combustion engine, wherein the phaser ( 10 ), which is designed as a hydraulically actuated rotary piston adjuster, to be coupled to a drive means stature ( 12 ) and a rotatably connected with the while rotor ( 14 ), which in the stature ( 12 ) is rotatably mounted and coupled thereto for transmitting torque, characterized in that the rotor ( 14 ) and / or stature ( 12 ) have been produced close to the final shape by powder metallurgical injection molding. Phase adjuster according to claim 1, characterized in that the rotor ( 14 ) and / or stature ( 12 ) have been cured by heat treatment, preferably by induction hardening and tempering. Phase adjuster according to claim 1 or 2, characterized in that the rotor produced by powder metallurgy injection molding ( 14 ) and / or the stature produced by powder metallurgical injection molding ( 12 ) has or has a core hardness according to Brinell of at least 120 HB 2.5 / 62.5 (DIN EN ISO 6506). Phase adjuster according to claim 1, 2 or 3, characterized in that the stator produced by powder metallurgy injection molding ( 14 ) a peripheral toothing ( 20 ), which has been post-processed by machining. Phase adjuster according to claim 4, characterized in that the peripheral toothing ( 20 ) has a Vickers hardness of at least 600 HV 0.1 (DIN EN ISO 6507) on the tooth tip and a Vickers hardness of at least 500 HV 0.1 (DIN EN ISO 6507) on the tooth base. Phase adjuster according to one of claims 1 to 5, characterized in that the rotor produced by powder metallurgy injection molding ( 14 ) and / or the stator produced by powder metallurgy injection molding ( 12 ) Sealing surfaces ( 46 ), which have been micromachined by machining. Phase adjuster according to one of claims 1 to 6, characterized in that the rotor produced by powder metallurgy injection molding ( 14 ) and / or the stator produced by powder metallurgy injection molding ( 12 ) are made of a low alloy steel having a carbon content of 0.6 to 0.8% and a copper content of 1.0 to 2.0%. Phase adjuster according to one of claims 1 to 7, characterized in that the rotor ( 14 ) a plurality of drive channels extending from the center to the outside ( 34 . 36 ), and that on at least one of the end faces of the rotor ( 14 ) at least one recess ( 38 ) and / or between the drive channels ( 34 . 36 ) at least one breakthrough ending at the two end faces ( 40 ) are formed or is. Device for adjusting the phase position of a shaft, in particular for adjusting the phase position of a camshaft in a combus tion engine, with a trained as Rotationskolbenversteller phasing ( 10 ) according to any one of the preceding claims.