WO2014190979A1

WO2014190979A1 - Camshaft adjusting device

Info

Publication number: WO2014190979A1
Application number: PCT/DE2014/200086
Authority: WO
Inventors: Boris PÜTZ; Ali Bayrakdar
Original assignee: Schaeffler Technologies Gmbh & Co. Kg
Priority date: 2013-05-28
Filing date: 2014-02-26
Publication date: 2014-12-04
Also published as: DE102013209865A1; DE102013209865B4

Abstract

The invention relates to a camshaft adjusting device comprising a vane cell adjuster with - a rotationally drivable stator (2), and - two rotors (1, 3) rotatably mounted in the stator (2), wherein - a plurality of radially inward protruding projections (3) are provided on the stator (2), each said projection dividing an annular space between the stator (2) and one of the rotors (13) into multiple pressure chambers, - a plurality of radially outward protruding vanes are provided on each of the rotors (1, 3), said vanes dividing the pressure chambers into chambers (4A, B, C) which act in opposite directions, - the working chambers (4A, B, C) can selectively be supplied with a pressure medium via a central valve (6) with a valve body (7), which is movably guided in the central valve, in order to adjust the rotors (1, 3) relative to the stator (2), and - the working chambers (4A, B, C) of the two rotors (1, 3) can be supplied with the pressure medium via a common central valve (8), by means of which the working chambers (4A, B, C) of the rotors (1, 3) can be selectively supplied with the pressure medium dependent on the position of the valve body (7).

Description

Camshaft adjustment device

The invention relates to a camshaft Verstellelteinnchtung with the features of the preamble of claim 1.

Camshaft adjusting devices comprise a camshaft and a vane-cell adjuster which, in its basic construction, has a stator which can be driven by a crankshaft and a rotor which is connected in a rotationally fixed manner to the camshaft. Between the stator and the rotor, an annular space is provided, which is divided by non-rotatably connected to the stator, radially inwardly projecting projections in a plurality of pressure chambers, each divided by a radially projecting from the rotor outwardly projecting wing in two working chambers opposite effective direction Depending on the application of pressure to the working chambers, the rotor is then adjusted relative to the stator and thus also the camshaft relative to the crankshaft in the direction of "early" or _" late". The working chambers are thereby limited by the lateral surfaces of the projections and the wings and by a first sealing surface on the rotor and a second sealing surface on the stator, against which the projections and the wings abut sealingly with their end faces

For pressurizing the Arbeitskammem z B, a central valve may be provided with a displaceable valve body having a plurality of control edges and Druckmittelkanaien through which the pressure medium as a function of the position of the valve body is selectively introduced into the Arbeitskammem Further, the central valve serves to clamp the rotor with the camshaft, in which the central valve rests externally with a radial flange on an outer side surface of the rotor and is screwed with a threaded portion in an internal thread of the camshaft This creates a frictional connection between the camshaft and the rotor or between the rotor and the central valve, through which the adjusting forces required for the adjustment of the camshaft 2 are transmitted. The central valve is also referred to in this form as the central screw

According to a further development of such a camshaft adjusting device, a second rotor is provided with which the rotational angle of a second camshaft relative to the stator or the camshaft is adjustable. wherein the camshafts are arranged one inside the other and concerted. Such camshaft arrangements are also known from Xam in Cam ^u - camshafts, for the adjustment of the camshafts two separate separate valves are provided, which are independently acted upon by a pressure medium. Due to the two separate valves both the Herstetlkosten and the assembly cost of the Nockenwellenverstelteinrtehtung be increased Against this background, the invention has the object to provide a cost camshaft adjusting device for independent adjustment of the rotation angle of two cam worlds with respect to a stator, which also with a lower cost should be mountable. The object of the invention is achieved by a camshaft adjusting device having the features of claim 1. More preferred embodiments of the invention can be taken from the subclaims, the figures and the associated description. According to the basic idea of the invention, it is proposed that the working chambers of the two rotors be replaced by a common central valve can be acted upon with pressure medium, through which the working chambers of the rotors can be acted upon depending on the position of the valve body optionally with pressure medium. The proposed solution can considerably simplify the structural design and reduce the manufacturing costs and the assembly costs. Furthermore, the costs can be reduced, since only one actuator is required to adjust both rotors 3

The structural design can be simplified werter by at least one pressure medium channel is provided in the central valve through which the working chambers of a first effective direction of a first rotor acted upon by pressure medium or with a pressure medium reservoir, while the working chambers of the opposite second effective direction of the same rotor through one vent hole is connected to the environment. The proposed solution does not require that the working chambers of the second direction of action be connected to the pressure medium piping system via the central valve. The control of the rotational movement of the first rotor relative to the stator is thus effected solely by the pressure medium loading of the Arbertskammem the first wind direction, while the working chambers of the second direction of action are shadowed by the vent openings virtually passive In particular, the Arbeitskammem the first direction of action of the first rotor by the same As a result, only one pressure medium channel must be provided in the central valve for rotational angle adjustment of the first rotor or for pressurizing the Arbertskammem the first rotor, which by an appropriate control of the movement of Ventilkörpero wahhweise with the pressure medium reservoir or a pressure medium pump is fluidically connected

It is also proposed that the working chambers of the first direction of action, which can be acted upon by pressure medium and be connected to the pressure medium reservoir, the Arbeitskammem whose volume is increased for adjusting the first rotor in the direction of the drive rotational movement of the stator During the rotational movement of the camshaft act on the camshaft Due to the proposed pressurizing the Arbeitskammem, which increase their volume in an adjustment of the rotor in the direction of rotation, the rotor is actively rotated at a Druckmrttelbeaufschlagung against the effective camshaft alternating torques. At a rotation of the rotor opposite 4 of the Drehnchtung the same Arbertskammem must be connected only to the Druckmittelre- servolr, while the acting Nockenwellenwechsel- moments are used to apply the necessary adjustment forces to rotate the first rotor in the direction of the acting Nockenweltenverstelleinrichtung against the stator.

Werter is proposed that the first rotor is biased in a first direction of rotation by means of a spring. and the Arbertskammem. which are acted upon by pressure medium and can be connected to the pressure medium reservoir, which are Arbertskammem whose volume is increased to adjust the first rotor against the first direction of rotation of the first rotor by the spring biasing the rotor in one direction and at a pressure medium loading of the Arbertskammem against the acting Twisted spring force. In the opposite case, when the rotor is to be rotated in the direction of the acting spring force with respect to the stator, the same working chambers need only be connected to the pressure reservoir, so that the first rotor can rotate in the direction of the spring force with respect to the stator and that in the Working chambers located pressure medium can flow back into the pressure fluid reservoir.

It is further proposed that the pressure medium channels are arranged on the Zentratventll such that the working chambers of a first effective direction of a first rotor in a first stop position of the valve body and the working chambers of the other second effective direction of the same rotor can be acted upon in a second stop position of the valve body with pressure medium, and that the Arbertskammem of each other second rotor in at least one between the first and the second stop position arranged intermediate position of the valve body can be acted upon with pressure medium The rotational movement of the first rotor can thereby be controlled very easily by the valve body in each case in the first or second Stop position is moved. The movement of the second rotor is then effected by displacement of the valve body between the stop positions, wherein the angular position of the first rotor to the stator is not changed. 5

The invention will be explained in more detail below with reference to a preferred embodiment. 1 shows a camshaft adjusting device according to the invention

Section sharing: and

2-5: an enlarged sectional view of the cam world adjusting device with a central valve and a valve body moved in various positions

FIG. 1 shows a sectional view of a camshaft adjusting device according to the invention with a vane-type adjuster with two rotors 1 and 3 and a stator 2. The stator 2 comprises radially on the outside a driving surface, such as a toothing, over which the vane tine translator engages Endless tension means is driven. The drive can take place via a crankshaft of an internal combustion engine or another drive shaft. The stator 2 itself has a plurality of radially inwardly projecting projections which extend up to corresponding radially inner sealing surfaces of the rotors 1 and 3 and thereby each divide an annular space existing between the rotors 1 and 3 into a plurality of pressure chambers the rotor 1 is provided with a plurality of vanes which extend up to a second sealing surface of the stator 2 and thereby further divide the pressure chambers formed into two oppositely acting arc chambers. In the sectional view, only the working chambers 4 of the rotor 3 can be seen the other working chambers of the rotor 3 and the Arbeitskammem of the rotor 1 can not be seen. The working chambers can be acted upon by a respective pressure medium medium through each emen pressure medium channel 16,14 and 22 in the rotors 1 and 3 via a central pressure medium circuit. In the event that the pressure medium is introduced into the working chambers of a first effective direction, the rotor 1 or 3 is rotated relative to the stator 2, wherein the volume of these Arbeitskammem is larger and the volume of befindlichem on the other side of the wing 6 working chamber of a second effective direction is smaller It is there »Druckmrtte! from the not acted upon by pressure medium working chambers of the second direction of action, the volume is smaller, returned to a Druckmrttelreservoir T. By applying pressure medium to the working chambers 4 of a wind direction, the rotor 1 is then rotated either in the direction of rotation of the stator 2 or counter to the direction of rotation of the stator 2 with respect to this

To control the flow of pressure medium from a pressure medium pump "P" in the Arbeltakammern 4 and from these back into the Druckmrttelreservoir "T" is a central valve 8 in a through hole 11 of the rotors 1 and 3 is provided, which has a base body 9, a valve core 30 and a in the valve insert 30 slidably guided, spring-loaded valve body 7 includes. In the central valve 6, a complex pressure medium side system of pressure medium channels and pressure medium chambers is further provided by which the inflow and outflow of the pressure medium is controlled in response to the valve body The Druckmrttelteitsystem will be described later.

The first rotor 3 and the second rotor 1 are arranged parallel to one another and are rotatably mounted in the stator 2. The second rotor 1 is clamped to the first camshaft 17 via the central valve 6, in which the central valve 6 is threaded with a threaded portion 10 into an internal thread first camshaft 17 is screwed. and thereby clamps the second rotor 1 between the end face of the first camshaft 17 and a radial flange 8 provided on the front side on the central screw 6. The first rotor 3 is connected in a rotationally fixed manner to the first camshaft 5 by the first camshaft 5 having a threaded section 29 Internal thread of the first rotor 3 is screwed. The first and second camshaft 17 and 5 are both tubular and inserted into each other and can be adjusted by the rotationally fixed connection with the rotors 1 and 3 each individually relative to the stator 2 in the angular orientation

The central valve 6 comprises a tubular main body 9 with a central through-opening 31 in which a valve insert 30 with a therein 7 ordered, slidably guided valve body 7 is arranged. The valve body 7 is spring-loaded by means of a spring 32 in the direction of a stop position in the right-hand stop position and secured against slipping by a securing ring 33. Both the valve insert 30 and the valve body 7 are tubular, so that the Zerrtral valve 6 has a central passage opening 27 The pressure medium flows to the central valve 6 from the pressure medium pump "P ^* through the central passage opening 31 in the illustration of FIG. 2 from the right. further through a complex Oruckmittelteits stem of the central valve 6 in the working chambers 4 and out of these and then through the central passage opening 27 of the Ventilkörpefs 7 back to the pressure medium reservoir "T back

The pressure medium control system of the central valve 6 comprises a complex structure comprising a plurality of pressure medium channels 13, 18 and 19 in the main body 11, a pressure medium channel 15, a plurality of pressure medium chambers 20 and 21 and pressure medium lines 24 and 25 in the valve core 30 and finally a pressure medium channel 23 and two pressure medium chambers 26 and 28 in the valve body 7 The terms pressure medium channel, pressure medium line and Druckmrttelkammer should be understood in the context of the invention as cavities, which are adapted to direct the pressure medium from one point to another point Here, in particular, the pressure medium chambers as grooves or area depressions be formed on the surfaces of the components over which the pressure medium is deliberately distributed or can open into the plurality of spatially spaced Druckmrttelleitungen

The pressure medium control system is explained in more detail below with reference to various positions of the valve body 7 shown in FIGS. 2 to 5, wherein in the diagram in the figures, the volume flow of the pressure medium can be recognized by the dashed line over the displacement path of the valve body 7, which currently in the position of the valve body 7 respectively flows through the central valve 6. 8th

2, the valve body 7 is in the left-side first stop position on the securing ring 33, in which the through the opening 31 supplied pressure medium flow, P "by a non-illustrated structure of control edges on the central valve 6 in the pressure medium chamber 26th Starting from the pressure medium chamber 26, the pressure medium flows further into the pressure medium chamber 21 of the valve core 30 and then through the pressure medium channels 19 and 22 into the working chambers _" B" between the second rotor 1 and the stator 2. Furthermore, the pressure medium flows out of the working chambers .A ^* via the pressure medium channels 14, 13, 15 and 23 into the through-opening 27 of the valve body 7 and from there into the pressure medium reservoir "T ~ in the illustrated arrow direction. As a result of the pressure medium flow described, the second rotor 1 is rotated in a first direction of rotation relative to the stator 2. The pressure chambers "C" between the first rotor 3 and the stator 2 are not pressurized in this position, so that the position of the first rotor 3 is not changed relative to the stator 2.

In the position of the valve body 7 shown in FIG. 3, the latter was displaced to the right against the spring exerted by the spring 32 by an actuator, not shown. By the displacement of the valve body 7, the pressure medium chamber 21 and the Druckmittefcanal 15 through the valve body. 7 closed radially inward, so that the second rotor 1 is not further adjusted relative to the stator 2. At the same time, the pressure medium line 24 of the valve insert 30 coming from the pressure medium chamber 20 has flow technology connected to a section of a pressure medium line of the valve body 7, so that the pressure medium from the working chambers "C" of the first rotor 3 through the pressure medium passages 16, 12 and 18 via the pressure medium chamber As a result, the first rotor 3 can automatically rotate relative to the stator 2 on account of the camshaft alternating torques acting on the first camshaft 17. The working chambers of the other effective direction, which are arranged on the respective other sides of the blades of the first rotor 3, are practically adapted by vent openings (not shown). 9 siv switched so that they do not hinder the rotational movement of the first rotor 3 Ole rotational movement of the first rotor 3 m can also be effected in this case by a spring acting on the first rotor 3 and / or supported.

In the position of the valve body 7 shown in FIG. 4, the latter was further displaced against the spring 32 to the right. The displacement of the valve body 7 interrupted the flow connection created via the pressure medium 24 and instead established a flow connection between the passage 31 to a pressure medium pump "P ^* and the pressure medium chamber 28 created by a Druckmittellertung 25. As a result, the pressure medium can now flow from the pressure medium pump "P" via the pressure medium chamber 28 through the pressure medium chamber 20 through the Druckmlttetkanäte 18, 12 and 16 in the same working chambers "C" By the inflowing pressure medium in the working clamps, C ", the first rotor 3 counter At the same time, the pressure medium ducts 14 and 22 leading to the working chambers J "and" B "are still closed, so that the second rotor 1 is not displaced The positions shown in FIGS. 3 and 4, the first rotor 3 are stiffened independently of the second rotor 1 relative to the stator 2

In the position shown in FIG. 5, the valve body 7 has been further displaced by the actuator into a second right-side stop position. In this position of the valve body 7, the pressure medium lines 25 and 24 are interrupted in terms of flow, so that the pressure medium can neither flow away nor flow into it from the Arbert chambers "C". Instead, the pressure medium chamber 26 is fluidically connected to the pressure medium channels 15, 13 and 14, respectively, so that the pressure medium ^* supply flows into the working chambers _, there during from the working chambers "B ^* simultaneously over the shared in the discharge pressure fluid chamber 21 back to the pressure medium reservoir" may flow V in this position of the valve body 7, the second Rotor 1 counter to the direction of rotation of the second rotor 1 in the first Impact position of the VenNkdrpers 7 (see Fi 2) with respect to the stator 2 twisted

The proposed solution allows both rotors 1 and 3 to be adjusted using a single centrate valve 6. The adjustment movement of the second rotor 1 is brought about by the movement of the valve body 7 into one of the stop positions, while the adjustment of the first rotor 3 is effected by the movement of the valve body 7 is effected in one of the intermediate positions shown in Figures 3 and 4.

Since leading to the Arbert chambers .C "leading Druckmrttelteitungen 24 and 25 during the movement of the valve body 7 from the first to the second stop position only for a very short tent span fluidly with the Arbertskammern" C ", the coupling of the first rotor 3 with the stator 2 during the movement of the Ventilkörpef 7 from the first stop position (Fig. 2) in the second stop position (Fig, 5) reserved only for a short moment in which the pressure medium lines 24 and 24 respectively produce a fluidic connection (Fig. 3 and Fig. 4), since this period is very short. the first rotor 3 can perform no appreciable movements relative to the stator 2, so that this disadvantage can be accepted.

Further, in the central valve 6 or in the inlet to the Druckmittelpurnpe .P ^* a-acting non-return valve can be seen upstream in the direction of the pressure medium pump "P" through which pressure peaks in the Zentrafventil 6, for example because of the camshaft alternating torques, by a return flow of fluid to the pressure medium pump "P ^" down, can be removed. LIST OF REFERENCE NUMBERS

1 rotor

2 stators

3 rotor

4 working chamber

5 Second camshaft

6 central valve

7 valve body

8 radial flange

9 basic body

10 threaded section

1 1 passage opening

12 pressure medium channel

13 pressure medium channel

14 pressure medium channel

15 pressure medium channel

16 pressure medium channel

17 First camshaft

18 pressure medium channel

19 pressure medium channel

20 pressure medium chamber

21 pressure medium chamber

22 pressure medium channel

23 pressure medium channel

24 pressure medium line

25 Dnjckmittelleitung

26 pressure medium chamber

27 passage opening

28 pressure medium chamber

29 thread cut

30 Ventiteinsatz 31 passage opening

32 spring

33 Circlip A working chamber

B working chamber

C work chamber

T Printers tenderer

P pressure medium pump

Claims

claims

Cam ellenverstelleinrichtung with a Flügelzeltenversteller with -a rotatorisch drivable stator (2). and two rotors (1, 3) rotatably mounted in the stator (2), wherein a plurality of radially inwardly projecting projections (3) are provided on the stator (2), each defining an annular space between the stator (2). and divide one of the rotors (1, 3) into a plurality of pressure chambers, and each of the rotors (1.3) is provided with a plurality of radially outwardly projecting vanes dividing the pressure chambers into oppositely acting Arbertskammem (4.ABC), wherein the Arbertskammem (4.ABC) for adjusting the rotors (1, 3) relative to the stator (2) either via a central valve (6) with a slidably guided therein valve body (7) are acted upon with a pressure medium, characterized in that.

- The Arbertskammem (4, A, ß, C) of the two rotors (1, 3) by e <n common central valve (6) can be acted upon with pressure medium through which the working chambers (4.ABC) of the rotors (1.3) in dependence from the position of the valve body (7) are selectively acted upon with pressure medium.

Camshaft adjusting device according to claim 1, characterized in that -in the central valve (6) at least one pressure medium channel (18) is provided, through which the Arbertskammem (4AB.C) a first effective direction of a first rotor (1.3) acted upon with pressure medium or mct a pressure medium reservoir (T) are connectable, while the Arbertskammem (4.ABC) of the opposite second direction of action of the same rotor (1.3) are connected by a vent opening with the environment Camshaft adjusting device according to claim 2, characterized in that the working chambers (4 ABC) of the first action of the first rotor (1.3) can be acted upon by the same pressure medium channel (16, 12, 18) both with pressure medium and connected to the pressure medium reservoir (T).

Camshaft adjusting device according to claim 2 or 3, characterized in that the working chambers (4.ABC) of the first wind direction, which are acted upon by pressure medium and connectable to the pressure medium reservoir (T), are the working chambers (4, A, B, C), whose volume for adjusting the first rotor (1, 3) in the direction of the drive rotational movement of the stator (2) is increased.

Camshaft Verlening according to one of claims 2 to 4, characterized. that the first rotor (1.3) is biased in a first direction of rotation by means of a spring, and the working chambers (4.ABC), which can be acted upon by pressure medium and connectable to the pressure medium reservoir (T), are the working chambers (4 ABC), whose volume for adjusting the first rotor (1.3) counter to the first rotational direction of the first rotor (1.3) is increased.

Camshaft adjusting device according to one of the preceding claims, characterized. in that the central valve (6) has a pressure medium control system which is designed in this way. in that the working chambers (4.ABC) of a first direction of action of one of the rotors (1 3) m a first stop position of the valve body (7) and the working chambers (4, A, B, C) of the other second effective direction of the same rotor (1, 3 ) can be acted upon with pressure medium in a second stop position of the valve body (7), and in that the working chambers (4, A, BC) of the respective other rotor (1.3) can be subjected to pressure medium in at least one intermediate position of the valve body (7) arranged between the first and the second contact position.