DE102016200092A1 - Control valve with rotary actuator - Google Patents

Abstract

The invention relates to a control valve (1) for controlling and / or regulating a hydraulic fluid flow of a camshaft adjuster, having a translationally movable actuator part (2) which is coupled to an actuating element (3) in such a way that movement of the actuator part (2) causes switching of the actuator Adjusting element (3) between a first position and a second position enforces, wherein in one of the two positions of the hydraulic fluid flow is released and in the other position of the hydraulic fluid flow is interrupted, wherein the actuator part (2) with the actuating element (3) is so effectively coupled, a translational movement of the actuator part (2) forces a rotational movement of the actuating element (3). The invention further relates to a camshaft adjuster for an internal combustion engine, with a control valve according to the invention, wherein an outlet for a hydraulic fluid with an inlet of the camshaft adjuster is connected such that in the presence of the control element (3) in one position, such a hydraulic fluid flow to a rotor of the camshaft adjuster is achieved that the rotor rotates relative to a stator of the camshaft adjuster.

Description

The invention relates to a control valve for controlling and / or regulating a hydraulic fluid flow of a camshaft adjuster, for example of the vane type, with a translationally movable Aktorteil, such as an adjustment pin, wherein the Aktorteil with an actuating element, such as in the manner of a valve sleeve, is coupled such that a movement of the Aktorteils forces a switching of the actuating element between a first position and a second position, wherein in one of the two positions of the hydraulic fluid flow is released and in the other position of the hydraulic fluid flow is interrupted.

The publication DE 10 2012 220 830 A1 describes a control valve for a hydraulic device with a replaceable hydraulic unit. A control piston is in this case arranged in a receiving component such that it undergoes a translatory movement by activation of sides of a drive and thus completely, partially and / or not covered openings in a control sleeve.

A generic device is also from the published patent application DE 10 2012 218 802 A1 known. This discloses a control valve for a camshaft adjusting system. Via a head, a control piston arranged in a control sleeve communicates with an actuator, which can cause a translation of the control piston. Radial openings in a valve sleeve vary depending on the axial position of the control piston, a flow rate for a hydraulic fluid flow.

Furthermore, the describes DE 10 2012 210 178 A1 a control valve of a camshaft adjuster. The control valve has a housing with three axially spaced pin openings, wherein two pin openings are each connected in two axial positions of the control piston to a tank port and the third pin opening is not fluidly connected to the tank port in a third axial position of the control piston.

The prior art also includes the publications DE 10 2012 202 520 A1 . DE 10 2012 201 573 A1 and DE 10 2008 030 057 A1 ,

Thus, from the prior art control valves are known in which an actuator / a control piston is controlled such that the actuator part causes switching an actuator / a control sleeve, which in turn controls the hydraulic fluid flow in a camshaft adjusting / varies.

The disadvantages of the prior art disclosed in these documents are that a control valve unit consists of a plurality of individual components. This increases the complexity of mounting the control valve in, for example, a camshaft adjustment system. In addition to the assembly complexity, the production costs of the control valve are kept high with a high number of individual components. Another disadvantage of the control valves known from the prior art is their immediate dependence on the positioning accuracy of an actuator. Since the known Aktorteile be moved exactly by the amount that is given them by the actuator, it is necessary for a high setting accuracy of the camshaft adjusting that the actuator predetermines the desired axial displacements exactly as between the actuator and the actuator no intermediate element with, for example a translation is arranged. This dependence on the adjustment accuracy of the actuator reduces the flexibility of the camshaft adjustment system.

It is therefore the object of the present invention to overcome the disadvantages of the prior art, and in particular to disclose a control valve with a few parts for a simple installation, for a cost-effective production and ultimately a high setting accuracy of a hydraulic fluid flow in achieved a camshaft adjustment system.

This is inventively achieved in that the Aktorteil is operatively coupled to the actuator so that a translational movement of the Aktorteils forces a rotational movement or rotational movement of the actuating element. Thus, the adjustment accuracy of the control valve is increased because a translation between the translational and the rotational movement is specifically adjustable. Furthermore, such an arrangement makes it possible for fluid openings leading to hydraulic chambers of the camshaft adjusting system to be covered with high precision by means of a rotational movement. Finally, the solution according to the invention has the effect of reducing the total number of elements of the control valve. Also passage openings in the control element, which are usually realized by drilling, can be avoided with the device according to the invention.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

Thus, it is advantageous if a transmission is used for coupling the Aktorteils with the actuator. The translation of the transmission can vary depending on their field of application and the surrounding components specifically what the Flexibility of the control valve increased. In addition to the translation is also the underlying operating principle that selects the transmission, which converts the translational movement of the Aktorteils in the rotational movement of the actuating element, depending on the application. Here, the criteria of installation space and setting accuracy as well as cost factor are decisive.

A further advantageous embodiment is characterized in that the transmission uses a thread and a mating thread, for example with the interposition of inserts, such as rolling elements and / or balls, which are connected to each other in a force-transmitting and motion-calling manner. In such a transmission offers a ball screw, which is characterized by its compactness, its setting accuracy and its cost-effective procurement.

Also part of the invention is a camshaft adjuster for an internal combustion engine, with a control valve according to the invention, wherein an outlet for a hydraulic fluid with an inlet of the camshaft adjuster is connected such that in the presence of the actuating element in one position such a hydraulic fluid flow is achieved to a rotor of the camshaft adjuster in that the rotor rotates relative to a stator of the camshaft adjuster. Such a camshaft adjuster is able to selectively shift valve opening or closing times early or late and thus adapt the combustion process in an actively coupled internal combustion engine during operation to the respective operating conditions.

The camshaft adjuster has a camshaft-side and a belt-side end. At its camshaft end, it is operatively connected to the camshaft via a stator. At its rotor end, it is operatively connected to a belt via a rotor. Via a relative movement of the rotor to the stator, an adjustment of the camshaft and thus of intake and exhaust valves of an internal combustion engine is achieved. A hydraulic fluid flow is controllable such that the relative movement is performed. Preferably, the hydraulic fluid flow enters the camshaft adjuster from the camshaft-side end, is guided there according to the desired settings in the vane chambers of the camshaft adjuster, and exits at the belt-side end.

It is also advantageous if the control element of the control valve has control grooves. The control grooves are formed as grooves on the sleeve-like actuator on the radially outer surface. Preferably, the control grooves are aligned purely in the axial direction. The control grooves are prepared to house and forward the hydraulic fluid. On the actuator a plurality of control grooves are arranged.

Another advantage is that camshaft-side and belt-side control grooves are formed on the actuating element. The camshaft-side control grooves receive the hydraulic fluid and forward it, depending on the operating state, to corresponding radial openings, which are arranged radially outside of the actuating element on. The belt-side control grooves receive the hydraulic fluid from the radial openings and pass it on, for example to channels that are connected to a hydraulic fluid reservoir.

If a rotary sleeve is arranged within the actuating element, this enables an efficient conversion of the translational movement of the actuator part into a rotational movement of the actuating element. The actuator and the rotary sleeve are therefore connected torsionally rigid. An advantage of the use of this control element is that the control element with its control grooves on its radially inner surface does not have such a design that it converts the translational movement of Aktorteils in a rotatory. Instead, the rotary sleeve takes over this task, resulting in a clear separation of the function and an efficient design of the individual components follow.

Advantageously, a control valve is additionally configured on the camshaft-side end of the control valve. This control valve has a filter that does not allow viscous and / or coarse-grained hydraulic fluid to pass. Thus, the operation of the camshaft adjuster is additionally secured because the hydraulic medium always has the required consistency.

When a distributor bushing is arranged at the camshaft-side end of the adjusting element, the hydraulic fluid flow, which enters the control valve from the camshaft-side end, can be distributed in a targeted manner to the camshaft-side control grooves. The distribution socket is adapted in terms of their shape so that it seals an interior of the actuating element relative to the hydraulic medium.

A further advantage is that a valve housing is arranged radially outside the actuating element. In order to make an adjustment of the camshaft adjuster, the valve housing has radial openings through which fluid is passed. In this case, openings are arranged at least at two different axial locations of the valve housing. The one openings are early chamber openings, the other late chamber openings. Depending on whether the camshaft in the direction of a previous injection or a later Injection is to be adjusted, serve one or the other openings as feed and the other as discharge openings.

The valve housing preferably has the same outer dimensions as the valve housings known in the art. Thus, it is possible to use the control valve according to the invention in existing devices.

Advantageously, the Frühkammeröffnungen are offset to the Spätkammeröffnungen, in addition to their offset in the axial direction, in a range between 30 ° and 60 °, preferably 45 °, in the circumferential direction. Thus, the effect is achieved that the control grooves, which are arranged in the circumferential direction in a range between 30 ° and 60 °, preferably 45 °, are prepared to direct the hydraulic fluid to both the Frühkammer, as well as to the Spätkammerbohrungen.

In other words, it can be said that the present invention reduces the number of parts of a control valve, for example, for a phaser. This results in a simpler and possibly cost-saving design. For example, by means of a ball screw a translational movement of an actuator is converted into a rotational movement of an actuating element.

An offset by 45 ° in the circumferential direction of the Früh- or the late chamber openings does not affect the hydraulic fluid flow, since hydraulic channels are configured radially within the camshaft adjuster.

Depending on the axial position of the actuator part, the control grooves are in such a position in the circumferential direction that a hydraulic fluid flow in the hydraulic channels of the camshaft adjuster is allowed, partially approved or prevented.

In summary, the control valve according to the invention is prepared for use in a camshaft adjuster. It includes an actuator that is rotatable so that it unlocks different hydraulic fluid channels. Furthermore, the invention comprises a camshaft adjuster, which has an actuator which is in communication with an actuator part in such a way that it can inflict a translatory movement on it. By means of a gear, such as a ball screw, this translation is convertible into a rotation of the actuating element.

The invention will be explained in more detail by means of figures.

Show it:

1 an exploded view of the control valve according to the invention;

2 a perspective view of the control valve in the assembled state;

3a a side view of the control valve;

3b a plan view of the control valve;

4a a sectional view taken along the line IVa-IVa 3a ;

4b a sectional view taken along the line IVb-IVb 4a ;

5a a sectional view taken along the line Va-Va 5b with drawn hydraulic fluid flows in a first state;

5b a plan view of the control valve, with the section line Va-Va;

6a a sectional view taken along the line VIa-VIa 6b with drawn hydraulic fluid flows in a second state;

6b a plan view of the control valve, with the section line VIa-VIa;

7a a sectional view taken along the line VIIa-VIIa 7b with drawn hydraulic fluid flows in a third state; and

7b a plan view of the control valve, with the section line VIIa-VIIa.

The figures are merely schematic in nature and are for the sole purpose of understanding the invention. The same elements are provided with the same reference numerals. The features of the individual embodiments can be interchanged.

In 1 is an exploded view of a control valve 1 shown. The control valve 1 has an actuator part 2 on that with an actuator 3 is operatively coupled. The actuator part 2 includes a bolt-like adjusting pin 4 that of a rotary sleeve 5 is surrounded. The adjustment pin 4 has a thread, which will be discussed in more detail later in the application. The rotary sleeve 5 and the actuator 3 are rigidly coupled with each other. The mechanism between the rotation sleeve 5 and the adjusting pin 4 a motion conversion from translational to rotatory makes, in connection with 4 described in more detail. In the 1 shown letters R and N point to a belt-side end R of the control valve 1 and a camshaft end N of the control valve 1 out.

A pen face 6 of the adjusting pin 4 is formed in the direction of a belt-side end R. The pen face 6 communicates with an unillustrated actuator that is prepared to apply an axially acting force to the adjustment pin 4 exercise. To be in an operating condition in which from the actuator side no force on the adjusting pin 4 acts to restore an initial state, is still a coil spring 7 arranged. This is from the adjustment pin 4 arranged camshaft side and guides the Aktorteil 2 always in the initial state. On the radially outer surface of the actuating element 3 are arranged control grooves. These are divided into camshaft-side control grooves 8th and belt-side control grooves 9 on.

Radially outside the actuator 3 is a valve housing 10 arranged. This has a radially extending shoulder on which a stator of a camshaft adjuster can be fixed. In order to supply the camshaft adjuster and its fluid chambers with hydraulic fluid, the valve housing has 10 several radial openings. These are subdivided into camshaft-side openings 11 and belt-side openings 12 , Depending on the embodiment of the camshaft adjuster, the camshaft-side openings are suitable 11 for early or late chamber openings, while the belt-side openings 12 in the respective embodiment for the respective other openings, so the late or Frühkammeröffnungen suitable. To an offset of the belt-side control grooves 9 to the camshaft side control grooves 10 of 45 ° also in the further embodiment of the control valve 1 to meet, are the camshaft side openings 11 to the belt-side openings 12 offset by 45 °.

In the direction of the camshaft-side end N of the actuator 3 is radially inside the valve body 10 a distribution box 13 arranged. This has the function of the hydraulic fluid flows from the camshaft side end N in the control valve 1 occur on the desired camshaft side control grooves 8th to distribute. The distribution socket 13 is both axially and rotationally fixed within the valve housing 10 arranged.

In the direction of the camshaft-side end N of the distributor socket 13 is a control valve 14 arranged. This ensures the desired hydraulic fluid quality in the control valve 1 entry. 1 continues to provide a circlip 15 which is the control valve 1 stabilized in the axial direction.

A perspective view of the composite control valve 1 is in 2 shown.

3a represents a side view of the control valve 1 The sectional view along the line IVa-IVa is in 4a shown. 3b shows a plan view of the assembled control valve 1 , Here are the contours of Wälzköpern 16 visible, noticeable.

From the sectional drawing in 4a goes the construction of a ball screw, the translation of the adjusting pin 4 in the rotation of the actuating element 3 converts, forth. By an actuator force F is the adjustment pin 4 moved axially. The rolling elements 16 are here in the rotary sleeve 5 arranged so that they can not perform any axial movement. A thread 17 of the adjusting pin 4 is configured such that when axial movement of the adjusting pin 4 such interaction with the rolling elements 16 that has a rotation of the adjusting pin 4 and thus over the rolling elements 16 a rotation of the rotary sleeve 5 is effected. Because the rotary sleeve 5 rotationally fixed with the actuator 3 is connected, also rotates the actuator 3 and thus changes the position of the control grooves 8th . 9 such that the camshaft adjuster is adjusted to the desired extent.

4b shows a sectional view along the section IVb-IVb 4a dar. The two arrows 18 and 19 represent a first and a second direction of rotation of the actuating element 3 dar. Further clarifies 4b about that on the rolling elements 16 Caged in the rotary sleeve are arranged. The fact that there is a stop in the circumferential direction, the rotation of the rotary sleeve is only possible.

In 5a is shown an operating position in which the actuator, not shown, no axial force on the adjusting pin 4 exercises. The coil spring 7 thus ensures that the adjustment pin 4 does not make a stroke. A hydraulic inlet E from the camshaft-side end of the control valve 1 is thus via the control valve 14 and the distribution box 13 like that in the control grooves 8th . 9 that distributes a first inflow 20 through the belt-side opening 12 gets into the camshaft adjuster. A first outflow 21 however, takes place through the camshaft-side opening 11 instead of.

5b shows in which section plane the cut out 5a located.

In 6a was from the side of the actuator, not shown, such a force on the adjusting pin 4 exercised that a first stroke 22 was caused. This hub 22 has such a rotation of the actuating element 3 causes the control grooves 8th . 9 access to the openings 11 . 12 close. There is thus no hydraulic fluid flow in the illustrated state.

6b shows in which section plane the cut out 6a located.

In a third operating condition, a second stroke was initiated from the side of the actuator, not shown 23 of the adjusting pin 4 caused. This was the adjustment pin 4 moved so that it passes over the rolling elements 16 the rotary sleeve 5 and with it the actuator 3 rotates such that the hydraulic flow E now via a second inflow 24 and a second drain 25 takes place. In this third operating state, the second inflow takes place 24 over the camshaft side opening 11 instead, during the second outflow 25 over the belt-side opening 12 takes place.

7b shows in which section plane the cut out 7a located.

LIST OF REFERENCE NUMBERS

1

 control valve

2

 actuator part

3

 actuator

4

 adjusting pin

5

 rotor sleeve

6

 Pin end face

7

 coil spring

8th

 camshaft-side control groove

9

 belt-side control groove

10

 valve housing

11

 Camshaft-side openings

12

 belt-side openings

13

 manifold bushing

14

 control valve

15

 circlip

16

 rolling elements

17

 thread

18

 first direction of rotation

19

 second direction of rotation

20

 first inflow

21

 first outflow

22

 first stroke

23

 second stroke

24

 second inflow

25

 second outflow

N

 camshaft end

R

 belt side end

e

 hydraulic inlet

F

 actuator force

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 102012220830 A1 [0002]
• DE 102012218802 A1 [0003]
• DE 102012210178 A1 [0004]
• DE 102012202520 A1 [0005]
• DE 102012201573 A1 [0005]
• DE 102008030057 A1 [0005]

Claims (4)

Control valve ( 1 ) for controlling and / or regulating a hydraulic fluid flow of a camshaft adjuster, with a translationally movable actuator part ( 2 ), which with an actuating element ( 3 ) is coupled such that a movement of the Aktorteils ( 2 ) a switching of the actuating element ( 3 ) between a first position and a second position, wherein in one of the two positions the hydraulic fluid flow is released and in the other position the hydraulic fluid flow is interrupted, characterized in that the actuator part ( 2 ) with the actuating element ( 3 ) is so effectively coupled that a translational movement of the Aktorteils ( 2 ) a rotational movement of the actuating element ( 3 ) enforces. Control valve ( 1 ) according to claim 1, characterized in that a transmission for coupling the Aktorteils ( 2 ) with the actuating element ( 3 ) is used. Control valve ( 1 ) according to one of claims 1 or 2, characterized in that the transmission has a thread ( 17 ) and a mating thread, which are connected with each other in a force-transmitting and motion-calling manner. Camshaft adjuster for an internal combustion engine, having a control valve according to one of claims 1 to 3, wherein an outlet for a hydraulic fluid with an inlet of the camshaft adjuster is connected such that in the presence of the actuating element ( 3 In the one position, such a hydraulic fluid flow to a rotor of the camshaft adjuster is achieved, that the rotor rotates relative to a stator of the camshaft adjuster.

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