WO2017101909A1

WO2017101909A1 - Activation device for switching valves of an internal combustion engine and internal combustion engine

Info

Publication number: WO2017101909A1
Application number: PCT/DE2016/100583
Authority: WO
Inventors: Uwe Schaffrath
Original assignee: Fev Gmbh
Priority date: 2015-12-16
Filing date: 2016-12-14
Publication date: 2017-06-22
Also published as: DE112016005826A5; DE102015016235A1

Abstract

An activation device (11) for switching valves (10) of an internal combustion engine with an adjustable compression ratio, wherein each switching valve serves to control a flow of hydraulic oil in hydraulic chambers of an eccentric adjustment device of a respective connecting rod of the internal combustion engine, and wherein each switching valve has a pick-up (12) which can be actuated by the activation device (11), wherein the actuation device (11) has, for each switching valve and therefore for each pick-up (12) to be activated, a switching fork (13) with switching fork limbs (13a) lying opposite one another, wherein each of the switching fork limbs (13a) of each switching fork (13) is contoured on a side facing the respective pick-up and formation of a forward movement function face (21) and a return movement function face (22), and wherein a transition face (23) is formed between the forward movement function face (21) and the return movement function face (22) of the respective switching fork (13a).

Description

Bet & Feestseinriohtung for changeover valves of a

Internal combustion engine and internal combustion engine

The invention relates to an actuating device for

Umsclialtventile an internal combustion engine with variable

Compression ratio and an internal combustion engine with

variable compression ratio.

In combustion engines has a high impact

Compression ratio positive on the efficiency. Under the compression ratio, the ratio of the entire cylinder space before the compression to the remaining

Cylinder space after compaction understood. at

Combustion engines with spark ignition, as in gasoline engines, which usually have a fixed compression ratio, the compression ratio, however, may only be selected so high that at full load operation a so-called "knocking" is avoided, However, for the much more frequent Teiilastbereich the internal combustion engine, ie with low cylinder filling, the compression ratio with higher values are selected without a "knocking" would occur. The important part load range of an internal combustion engine can

be improved when the compression ratio is variably adjustable.

From DE 10 2010 016 037 AI an internal combustion engine with an adjustable compression ratio is known.

Connecting rods, which have a bung eye and a

Pleuellagerauge have are connectable via the Hublagerauge to a crankshaft and the connecting rod bearing eye to a respective cylinder piston of the internal combustion engine. Everyone

Connecting rod is associated with an eccentric adjusting device having an eccentric body and eccentric rods. The known from DE 10 2010 016 037 AI eccentric body has an eccentric to a midpoint of

Pleuellagerauges arranged piston pin bore with a center, wherein the piston pin bore a

5 piston pin receives. The eccentric adjusting device is used to adjust an effective connecting rod leff length, which is to be understood as the connecting rod length of the distance of the center of the piston pin bore to a center of the Hubagerauges. For the rotation of the eccentric body and thus to change the effective connecting rod leff leff are the eccentric rods of the eccentric adjustment

displaced. Each eccentric rod is associated with a piston which is displaceably mounted in a hydraulic chamber or

is guided. In the hydraulic chambers prevails

5 hydraulic pressure acting on the eccentric rods associated piston, wherein depending on the amount of oil in the

Hydraulic chambers, the displacement of the eccentric rods is possible or not possible. 0 The adjustment of the eccentric adjusting device is initiated by the action of mass and load forces of the internal combustion engine, which act on the eccentric adjusting device in a working cycle of the internal combustion engine. During a working cycle, the directions of action of the forces acting on the eccentric adjusting device are constantly changing. The

Verstellbewegung is supported by the acted upon Hyarauliköl piston, which act on the eccentric rods, wherein the piston is a Rücksteilen the eccentric adjusting device due to varying

o Prevent force action directions of the force acting on the eccentric adjusting forces. The

Eccentric rods that interact with the pistons are connected on both sides to the eccentric body. The hydraulic chambers, in which the pistons are guided, can be acted upon or filled with hydraulic oil from the crank bearing eye via hydraulic oil supply lines.

Check valves prevent backflow of the hydraulic oil from the hydraulic chambers back into the

Hydraulic oil supply lines. In a bore of the respective connecting rod, a changeover valve is received. The

Hydraulic chambers are in contact with the bore via hydraulic oil drain lines, which receives the changeover valve. The switching position of the changeover valve determines which of the hydraulic chambers is filled with hydraulic oil and softens the

Hydraulic chambers is emptied, of which the

Adjusting direction or direction of rotation of the eccentric adjusting device depends.

The switching valve known from DE 10 2010 016 037 A1 comprises an actuating element, a return spring and a control piston. As stated, the hydraulic oil is applied to the pistons of the eccentric rods guided in the hydraulic chambers

acts, the hydraulic chambers supplied from the Hublagerauge via the Hydraulikölzulaufleitungen, wherein the respective connecting rod engages with the Hublagerauge on the crankshaft so that between the crankshaft, namely a

Crankshaft journals same, and the crank bearing eye a connecting rod bearing shell is arranged.

About the hydraulic oil drain lines, the

Hydraulic chambers depending on the switching position of

Switching valve to be vented. Of this depends the

Adjustment direction or direction of rotation of the eccentric adjusting device from. DE 10 2012 112 461 AI describes a further internal combustion engine with an adjustable

Compression ratio at which the connecting rod length of

Connecting rods is variably adjustable. In a bore of the respective connecting rod, in turn, a switching valve is accommodated, which comprises a pick-off. On the

Abgreifer the respective changeover valve is actuated, namely via an attacking on Abgreifer actuator. From WO 2014/019684 AI an actuator for changeover valves of an internal combustion engine with adjustable compression ratio is known. The actuator comprises a shift fork for each switching valve and thus for each to be operated pick-off. Each shift fork comprises opposing shift fork legs, wherein the shift fork legs of the shift forks at the respective

Gripper facing sides under training a

Flow function surface and a return function surface are contoured. Between the Vorlauffunktionsflache and the Rücklauffunktionsflache each shift fork leg each shift fork a transition edge is formed, which the respective Vorlauffunktionsflache and the respective

Return function surface is linearly separated from each other. There is a need for an actuator for the switching valves of an internal combustion engine with adjustable compression ratio, the simple design a

Reliable actuation of the switching valves of a

Internal combustion engine allows. The object of the invention is a novel actuator for the switching valves of an internal combustion engine with adjustable compression ratio and an internal combustion engine with such

To provide actuating device. This object is achieved by an actuating device according to claim 1. Erfindungsgeraäß is between the respective Vorlauffunktionsflache and the respective

Return function surface of the respective shift fork leg formed a transition surface. The Vorlauffunktionsfläche and the Rücklauffunktionsfläche are not by a

line-like transition edge separated from each other, but rather to form a planar or area-like transition surface, this is a more reliable operation of the Abgreifer the changeover valves of an internal combustion engine with adjustable compression ratio possible.

Preferably, the respective flow function surface and the respective return function surface of the respective

Shift fork leg at one of the transition surface

facing away from end faces on a

crankshaft facing section opposite a

geweckangewgewaten section slanted, so that the flow function area and the

Return function surface on the crankshaft facing

Section are shortened relative to the crankshaft facing away section. This also serves to increase the

Reliability in the operation of the tappers of the

Change-over valves of the internal combustion engine with adjustable

Compression ratio.

Preferably, the transition surface at a

crankshaft facing section thereof a brief

Extension between the Vorlauffunktionsflache and the

Rücklau unktionsflache than at a crankshaft facing away portion of the same. This can further the reliability in the operation of the tap of the changeover valves

be increased. Preferably, the Vorlauffunktionsflache and the

Return function surface of each shift fork leg so contoured independently of each other and / or tilted in space around axes that a trajectory of a contact point of the respective Abgreifers along the functional surfaces in the region facing away from the transition surface end sides thereof through the crankshaft facing away from the end sides. This is a particularly reliable operation of the Abgreifer the changeover valves of an internal combustion engine with adjustable compression ratio possible.

The Abgreifer the respective switching valve is preferably cylindrical with lateral sections or ends of the same spherical or spherical segment-like contoured end faces formed. At least the Vorlauffunktionsflachen and possibly also the Rücklauffunktionsflachen the respective shift fork are preferably contoured and / or tilted in the space that the point of contact of the respective Abgreifers with the

respective functional surface of the respective shift fork always on one of these crowned or spherical segment-like

End faces of the tappet is located. Also hereby is a reliable operation of the Abgreifer the changeover valves of an internal combustion engine with adjustable

Compression ratio possible.

The internal combustion engine according to the invention with an adjustable compression ratio is defined in claim 11.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below.

Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing: Fig. 1 is a connecting rod with eccentric adjustment and

Changeover valve;

Fig. 2 shows an actuating device according to the invention for

Changeover valves of the connecting rods;

Fig. 3 is a shift fork of the invention

Actuating device of Fig. 2;

FIG. 4 shows a shift fork leg of the shift fork of FIG. 3; FIG.

and

Fig. 5 shows a shift fork together with a pick-off a

Changeover valve.

Fig. 1 shows a connecting rod 1 of an internal combustion engine with adjustable compression ratio according to a

Embodiment.

The connecting rod 1 has a connecting rod main body 7 with a connecting rod bearing eye 2 and a Hublagerauge 3. The connecting rod eye 2 serves to connect the respective

Connecting rod 1 to a cylinder piston (not shown) of a respective cylinder of the internal combustion engine The Hublagerauge 3 serves to connect the respective connecting rod 1 to a crankshaft (not shown) of the internal combustion engine.

The connecting rod 1 of Fig. 1 has an at least

arranged in sections in the connecting rod eye 2,

preferably hydraulically adjustable eccentric adjusting device 6. The eccentric adjusting device 6 has an eccentric to a central axis 8 of the

Pleuellagerauges 2 arranged piston pin bore with a central axis, which receives a piston pin (not shown). About the piston pin, the respective connecting rod 1 is coupled to the cylinder piston of the respective cylinder. The eccentric adjusting device 6 is used to adjust an effective connecting rod leff length of the connecting rod 1, A rotation of the adjustable eccentric adjusting device 6 is by the action of mass and load forces of

Internal combustion engine initiated, which act on the eccentric 6 at a power stroke of the internal combustion engine.

During a work cycle, the change

The directions of action of the forces acting on the eccentric device 6 are continuous. The rotational movement or adjusting movement is assisted by hydraulic fluid, in particular with oil, acted upon, integrated in the connecting rod assembly 1 and guided in hydraulic chambers piston, and the piston prevent a return of the eccentric adjusting device 6 due to varying

Force action directions of the force acting on the eccentric adjusting 6 forces.

The pistons of the eccentric adjusting device 6 are operatively connected by means of eccentric rods 4, 5 on both sides with an eccentric body 9 of the eccentric adjusting device 6. The eccentric adjusting device 6 can iron the pistons, the eccentric rods 4, 5 and the eccentric body 9. The pistons of the eccentric adjusting device 6 are not shown in Fig. 1 hydraulic fluid lines from the Hublagerauge 3 with hydraulic fluid over in Fig. 1, not shown

Check valves acted upon.

The check valves prevent a backflow of the hydraulic fluid from the piston volumes of the pistons back into the hydraulic fluid lines in an engine compartment of the internal combustion engine. In a bore of the respective connecting rod 1 is a

Uirtschaltventil 10 recorded. The hydraulic chambers of

Eccentric adjusting device 6 of the respective connecting rod 1 are connected via hydraulic fluid lines with the bore in contact, which receives the switching valve 10. The

Switching position of the switching valve 10 determines' which of the hydraulic chambers befülit with hydraulic oil and which of the

Hydraulic chambers is emptied, of which the

Adjusting direction or direction of rotation of the eccentric adjusting device 6 depends.

The respective change-over valve 10 of the respective connecting rod 1 has a tappet 12. The respective change-over valve 10 can be actuated by way of the tappet 12, namely via an actuating device 11 acting on the tappet 12. Details of the change-over valve 10 of the respective connecting rod 1 and the tappet 12 of the respective change-over valve 10 are known to the person skilled in the art, e.g. from DE 10 2012 112 461 AI familiar.

The present invention relates to details of

Actuator 11 for such a variable compression ratio internal combustion engine, namely an actuator 11, the actuation of the

Abgreifer 12 of the switching valves 10 of a plurality of connecting rods 1 is used. The actuating device 11 for actuating a plurality of changeover valves 10 of an internal combustion engine with an adjustable compression ratio has a plurality of shift forks 13, each of the shift forks 13 each having a tappet 12 each of a changeover valve 10 to be actuated

interacts. All shift forks 13 are preferably attached to a common support structure 14. The support structure 14 of the actuator 11 has a mounting frame 15 and at least one, in the shown

Embodiment preferably a common for all shift forks 13, relative to the mounting frame 15 displaceable

Guide element 16.

The Führungselernent 16 has in the shown

Embodiment over two mutually parallel guide rails 17, 18 which are fixedly connected to each other via a connecting web 19. At each guide rail 17, 18 of the guide member 16 are a plurality of shift forks 13th

attached.

About the mounting frame 15 is the entire

Actuator 11 on the crankcase (not shown) of the internal combustion engine mounted, namely on mounting screws, not shown, extending through mounting holes 20 in

Mounting frame 15 extend. As already stated, the guide element 16 is the

Actuating device 11 to which the shift forks 13 are attached, relative to the mounting frame 15 displaced, namely in the direction of the double arrow 26. By this relative movement of the shift forks 13 of

Actuator 11 relative to the mounting frame 15th

the same can, if during a working cycle of a cylinder integrated into the respective connecting rod 1 of the respective cylinder switching valve 10 in the region of the respective shift fork 16 of the

Actuator 15 has moved, the tappet 12 of the respective switching valve 10 for actuating the same

be actuated. The shift forks 13 of the actuator 11 are therefore together with the help of the common in the embodiment shown for all shift forks guide member 16 of

Support structure 14 to which the shift forks 13 are attached, relative to the mounting frame 15 of the support structure 14 and thus relative to the Abgreifern 12 of the changeover valves 10 displaced, namely between a first switching position of the shift forks 13 and a second switching position of

Shift forks 13.

About the shift forks 13 of the actuator 11 can in the respective switching position a defined switching position of the change-over valves 10 of the connecting rods 1 of the

Internal combustion engine with adjustable compression ratio can be adjusted.

The shift of the shift forks 13 of the actuator 11 from the first shift position to the second shift position is preferably carried out by means of a not shown

Actuator, wherein all the shift forks 13 together against the restoring force, in particular the spring force, a

preferably for all shift forks 13 common and

preferably formed as a spring element also not shown restoring element of the first switching position in the second switching position are displaced.

The restoring force, in particular the spring force of the

preferably formed as a spring element return element presses all the shift forks 13 together and automatically from the second switching position out in the direction of the first

Switching position, namely, when the actuator is not active. Each shift fork 13 comprises opposing shift fork legs 13a, 13b. Everybody asks

Schaltgabelschenkei 13a, 13b of each shift fork 13 on a respective tappet 12 side facing both a Vorlauffunktionsflache 21 and a

Rücklauffunktionsflache 22 ready, which cooperate with the tappet 12 such that the tappet 12 with a

Contact point 28 can move along a trajectory 27 along these functional surfaces 21, 22 (see Fig. 5).

The Abgreifer 12 of the respective ümschaltventils 10 is

preferably cylindrical with on lateral sections

the same spherical or spherical segmented contoured

Formed end faces.

According to the invention between the flow function surface 21 and the return function surface 22 of the respective

Shift fork leg 13a, 13b of each shift fork 13, a transition surface 23 is formed.

The Vorlauffunktionsflache 21 and the Rücklauffunktionsfläche 22 of each shift fork leg 13a, 13b accordingly do not go as in the prior art, forming a transitional edge line into each other, but rather areally or area-like formation of the

Transition surface 23.

As can be seen in particular from FIGS. 3 and 4, the transition surface 23 formed in the region of each shift fork leg 13a, 13b of the shift fork is preferably triangular-shaped, alternatively it may also be square-shaped

be contoured. As can best be seen in FIGS. 3 and 4, the advance function surface 21 as well as the one

Rücklauffunktionsflache 22 of the respective shift fork leg 13a, 13b on a side remote from the transition surface 23 side in each case one end face 24 and 25, namely the

Vorlauffunktionsflache 21 the front 25 and the

Return function surface 22, the front page 24. This

End faces 24 and 25 are designed such that they run chamfered at a crankshaft-facing portion 24a and 25a with respect to a crankshaft facing away portion 24b, 25b, so that both the

Vorlauffunktionsflache 21 and the return function surface 22 at the crankshaft facing portions 24a, 25a

compared to the crankshaft facing away portions 24b, 25b are shortened. 3 and 4 can be further seen that the transition surface 23 at a crankshaft-facing portion 23 a thereof has a shorter extension between the Vorlauffunktionsflache 21 and the return function surface 22 as a crankshaft facing away portion 23 b thereof. Starting from the crankshaft facing away from section 23b, therefore, the transition surface 23 tapers in the direction of the crankshaft facing portion 23a thereof.

The advance function surface 21 and the return function surface 22 of each shift fork leg 13a, 13b of each

Shift fork 13 are contoured independently.

Preferably, the Vorlauffunktionsflachen 21 and the Rücklauff nigungsflächen 22 respectively by planes which are tilted freely about at least two axes in space, wherein the tilt of the Vorlauffunktionsflache 21 and the

Return function surface 22 of the respective shift fork leg 13a, 13b of each shift fork 13 takes place independently of each other in the room. The contouring and / or tilting of the flow function surface

21 and the return function surface 22 of the respective

Schaltgabelschenkels 13a, 13b is preferably carried out such that the movement path 27 of the contact point 28th

5 of the respective tappet 12 along the functional surfaces 21,

22 so extends that the movement path 27 in the region facing away from the transition surface 23 end faces 24, 25 of the functional surfaces 21, 22 through the crankshaft facing away portions 24b, 25b of the end faces 24, 25 extends, so lo according to the of the shift forks 13 and Shift fork legs 13a, 13b provided functional surfaces in their length for the trajectory 27 of the touch point 28 of the respective pickup 12 optimal, namely maximum, can be exploited. It is therefore avoided that the contact track

15 27 of the respective touch point 28 of the respective

Abgreifers 12 by the tapered, crankshaft facing portions 24a, 25a of the end faces 24, 25 of

Vorlauffunktionsflache 21 and return function surface 22 extends, so that the movement path 27 of the

20 crankshaft facing portions 24a, 24b of the end faces 24, 25 is spaced apart.

The pick-off 12 of the respective switching valve 10 is

preferably cylindrical with at lateral portions or 5 ends of the same preferably spherical or spherical segment-like contoured end faces formed. At least the

Vorlauffunktionsflachen 21 and possibly also the

Rücklauffunktionsflachen 22 of the respective shift fork 13 are preferably contoured and / or tilted in space that 0 of the contact point 28 of the respective Abgreifers 12 with the

respective functional surface 21, 22 of the respective shift fork 13 is always on one of these crowned or spherical segment-like end faces of the tappet 12. The tappet 12 is preferably a cylindrical pin and has a diameter d. The tappet 12 is at its lateral end faces, which cooperate with the functional surfaces of the respective shift fork 13, preferably

spherically segmented with a spherical radius r,

At least the Vorlauffunktionsflache 21 and if possible depending on the available space and the Rücklauffunktionsflache 22 of the respective shift fork leg 13a, 13b of the respective shift fork 13 is contoured and / or tilted so that the pitch angle of the respective functional area smaller than aresin ((d / 2) / r ). This can then be particularly preferred to ensure that the contact point 28 of the respective Abgreifers 12 with the respective functional surface 21, 22 of the respective shift fork 13 is always on the spherical segment-like end face of the Abgreifers 12. As already stated, preferably at least the leading functional surfaces 21 are contoured in this way. In the area of the return function surfaces 22, this is also preferred. For the return function surfaces 22 but can for reasons of space in favor of

Vorlauffunktionsflachen 21 also another contouring and / or tilting can be selected, in such a way that the contact point 28 of the respective Abgreifers 12 with the respective return function surface 22 of the respective shift fork 13 is located on an edge of the Abgreifers 12.

The invention accordingly proposes a defined contouring of the shift fork legs 13a, 13b of each shift fork 13 of the actuating device 11 for changeover valves 10 of an internal combustion engine with an adjustable compression ratio. The Abgreifern 12, namely the lateral end faces of the Abgreifer 12, facing sides of Schaitgabekelkel 13a, 13b are contoured to form Vorlauffunktionsflächen 21 and Rücklauffunktionsflachen 22, wherein in the region of each shift fork leg 13a, 13b of the respective Schaltgable 13, the respective Vorlauffunktionsflache 21 and Respective return function surface 22 is designed independently of each other, and between which a transition surface 23 is positioned.

10

The Vorlauffunktionsflache 21 and the Rücklauffunktionsflache 22 are in the region of each Schaltgabeischkels 13a, 13b contoured such or inclined in space that a defined trajectory 27 of the Berührpunkts 28 of the respective Abgreifers

15 12 along the functional surfaces 21, 22 is provided to allow safe guidance and thus actuation of the attacker 12, said trajectory 27 through the crankshaft facing away portions 24b, 25b of the end faces 24, 25 of the functional surfaces 21, 22 of the respective

20 shift fork leg 13a and 13b extends. So it will be

avoided that the trajectory 27 of the contact point 28 of the respective tappet 12 by bevelled,

crankshaft facing portions 24a, 25a of these end faces 24, 25 of the functional surfaces 21, 22 extends to the

5 avoid collision with the crankshaft are bevelled and shortened accordingly,

Preferably, furthermore, at least the advance function surface 21 in the region of each shift fork leg 13a, 13b in such a way

o contours that the contact point 28 between tappers 12 and Vorlauffunktionsflache 21 always on the crowned or

spherical segment-like end face of the tappet 12 is located. Fig. 2 it can be seen that there ge2eigte

Actuator 11 with the exemplary number of six shift forks 13 two groups of three

Shifter forks 13, wherein on the left group of 13 shift forks shown in Fig. 2, the Vorlauffunktionsflachen 21 above the Rücklauffunktionsflachen 22 and on the shown in Fig. 2, right group of shift forks 13 the

Vorlauffunktionsflachen 21 below the

Return function surfaces 22 is positioned. This depends on the direction of rotation of the crankshaft.

Claims

claims

1, actuating device {11} for changeover valves (10) of an internal combustion engine with an adjustable compression ratio,

Wherein each switching valve is for controlling hydraulic oil flow in hydraulic chambers of an eccentric adjusting device of a respective connecting rod of the internal combustion engine, and wherein each switching valve has a pick-off (12) operable by the actuating device (11), the actuating device (11) for each Switching valve and thus for each operable tappet (12) has a shift fork (13) with opposite Schaltgabelschenkein (13a, 13b), and wherein each of the shift fork legs (13a, 13b) of each shift fork (13) on a side facing the respective Abgreifer5 and training a Vorlauffunktionsf-pool

(21) and a return function surface (22) is contoured, characterized in that between the

Flow function surface (21) and the return function surface

(22) of the respective shift fork leg (13 a, 13 b) a

0 transition surface (23) is formed,

2. Actuating device according to claim 1, characterized

in that the advance function surface (21) and the return function surface (22) of the respective

s Schaltgabekelnkels (13a, 13b) at one of the

Transition surface (23) facing away in each case an end face (24, 25), which on a crankshaft facing

Run section (24 a, 25 a) with respect to a crankshaft facing away from section (24 b, 25 b) beveled, so that the

o Vorlauffunktionsflache (21) and the return function surface (22) on the crankshaft-facing portion (24a, 25a) relative to the crankshaft facing away portion (24b, 25b) are shortened.

3. Actuating device according to claim 2, characterized in that the transition surface (23) on a crankshaft-facing portion (23 a) thereof has a short extension between the Vorlauffunktionsflache (21) and the Rücklauffunktionsflache (22) than at one

the crankshaft facing away portion (23 b) thereof.

4. Actuating device according to claim 2 or 3, characterized in that the Vorlauffunktionsflache (21) and the Rücklauffunktionsflache (22) of the respective

Schaltgabelschenkels (13a, 13b) are so contoured independently of each other and / or tilted in space around axes that a trajectory (27) of a Berührpunkts (28) of the respective Abgreifers (12) along the Funktionsfiächen (21, 22) in the region of the Facing away from transition surface (23)

End faces (24, 25) thereof by the

crankshaft facing away portions (24b, 25b) of the end faces (24, 25) extends.

5. Actuating device according to one of claims 1 to 4, characterized in that the transition surface (23) is contoured like a triangle or square.

6. Actuating device according to one of claims 1 to 5, characterized in that the Vorlauffunktionsflache (21) and the Rücklauffunktionsflache (22) of the respective

Shift fork legs (13a, 13b) are contoured independently of each other,

7. Actuating device according to one of claims 1 to 6, characterized in that the Vorlauffunktionsflache (21) and the Rücklauffunktionsflache (22) of the respective

Shift fork leg (13a, 13b) are tilted in space at least two axes tilted planes.

8. Actuating device according to claim 7, characterized

in that the advance function surface (21) and the respective return function surface (22) of the respective

s shift fork legs (13a, 13b) are tilted independently of each other in the space around the axes,

9. Actuating device according to one of claims 1 to 8, characterized in that at least the

10 Vorlauffunktionsflache (21) is contoured such that a contact point (28) between Abgreifer (12) and

Vorlauffunktionsflache (21) is always on a spherical or spherical segment-like end face of the Abgreifers (12).

15 10. Actuator according to claim 9, characterized

characterized in that a pitch angle at least the

Vorlauffunktionsflache smaller than aresin ((d / 2) / r), where r is the radius of the spherical segment-like face of the

Abgreifers (12), and wherein d is the diameter of

20 cylindrical Abgreifers (12).

11. internal combustion engine, which is a einsteilbares

Compression ratio, with several connecting rods (1), each one in a connecting rod eye (2) and / or

25 a Hublagerauge (3) arranged, hydraulically adjustable eccentric adjusting device (6) for adjusting a

effective bar length (leff) of each

Have a connecting rod eye (2), wherein an adjustment of the

Eccentric adjusting device (6) by means of a switching valve o (10) is controllable, characterized in that the

Switching valves (10) of an actuating device (11) according to one of claims 1 to 10 are actuated.