DE102016222332A1 - Cam element for a camshaft of a reciprocating internal combustion engine, and reciprocating internal combustion engine with such a cam element - Google Patents

Abstract

The invention relates to a cam element (1) for a camshaft rotatable about an axis of rotation of a reciprocating internal combustion engine, having a first cam pair (2), which has a first cam (3) for effecting a first stroke and a second cam (4) for effecting a second cam pair (5) having a third cam (6) for effecting a third stroke and a fourth cam (7) for effecting a fourth stroke different from the third stroke of a second gas exchange valve comprising a third cam pair (8) having a fifth cam (9) for effecting a fifth stroke and a sixth cam (10) for effecting a sixth stroke of a third gas exchange valve different from the fifth stroke, with a fourth cam pair (11) comprising a seventh cam (12) for effecting a seventh stroke and an eighth cam (13) for effecting a displacement of the s iebten stroke has different eighth stroke of a fourth gas exchange valve, wherein the first cam pair (2) and the second cam pair (5) a first cam group (15) and the third cam pair (8) and the fourth cam pair (11) a second cam group (16) form and which can be arranged on the camshaft and rotatably connected to the camshaft cam member (1) between the cam groups (15, 16) arranged gate (17), by means of which the cam member (1) in the axial direction (14) of the camshaft relative to this between a first position for adjusting the first, third, fifth and seventh stroke and a second position for adjusting the second, fourth, sixth and eighth stroke of the gas exchange valves is displaceable.

Description

The invention relates to a cam member for a camshaft of a reciprocating internal combustion engine and a reciprocating internal combustion engine according to the preamble of claim 8th ,

Such reciprocating internal combustion engines for motor vehicles, especially for motor vehicles, are already well known from the general state of the art and in particular from the production of standard vehicles. Such a reciprocating internal combustion engine comprises a first cylinder and a second cylinder, which are respective combustion chambers of the reciprocating internal combustion engine. During a fired operation of the reciprocating internal combustion engine, combustion processes occur in the cylinders, in each of which a fuel-air mixture is burned.

In this case, the reciprocating internal combustion engine comprises a first gas exchange valve associated with the first cylinder and a second gas exchange valve associated with the first cylinder, wherein the gas exchange valves are designed, for example, as intake valves or exhaust valves. In addition, the reciprocating internal combustion engine comprises a third gas exchange valve associated with the second cylinder and a fourth gas exchange valve associated with the second cylinder. The gas exchange valves are used to control the so-called charge change of the respective cylinder. In addition, the reciprocating internal combustion engine comprises at least one camshaft rotatable about an axis of rotation for actuating the gas exchange valves. Usually, the respective gas exchange valve is actuated by means of the camshaft in such a way that the respective gas exchange valve is moved translationally and thereby opened, for example.

The respective gas exchange valve is closed, for example, by means of a respective spring.

Object of the present invention is to provide a cam member and a reciprocating internal combustion engine, so that a particularly space and weight-favorable operation of several gas exchange valves can be realized.

This object is achieved by a cam element having the features of the patent claim 1 and by a reciprocating internal combustion engine having the features of the claim 9 solved. Advantageous embodiments of the invention are the subject of the dependent claims.

A first aspect of the invention relates to a cam element for a camshaft rotatable about a rotation axis of a reciprocating internal combustion engine. The cam element according to the invention comprises a first cam pair, which has a first cam for effecting a first stroke and a second cam for effecting a different from the first stroke second stroke of a first gas exchange valve of the reciprocating internal combustion engine. The cam member further includes a second cam pair including a third cam for effecting a third stroke and a fourth cam for effecting a fourth stroke different from the third stroke of a second gas exchange valve of the reciprocating internal combustion engine. Further, the cam member includes a third cam pair having a fifth cam for effecting a fifth stroke and a sixth cam for effecting a sixth stroke different from the fifth stroke of a third gas exchange valve of the reciprocating internal combustion engine. In addition, the cam member according to the invention comprises a fourth cam pair having a seventh cam for effecting a seventh stroke and an eighth cam for effecting an eighth stroke of a fourth gas exchange valve different from the seventh stroke.

In this case, the first cam pair and the second cam pair form a first cam group, wherein the third cam pair and the fourth cam pair form a second cam group. In addition, the cam element, which can be arranged on the camshaft and can be connected non-rotatably to the camshaft, comprises a link arranged between the cam groups, by means of which the cam element is displaceable in the axial direction of the camshaft and thus along the rotational axis relative to the camshaft between a first position and a second position , The first position is used to set the first, third, fifth and seventh stroke, the second position is used to set the second, fourth, sixth and eighth stroke of the gas exchange valves. Since the cams are components of the cam member, the cams are simultaneously displaced between the positions relative to the crankshaft along the axial direction of the crankshaft when the cam member is displaced relative to the camshaft in the axial direction of the camshaft. As a result, depending on the position of the cam element, either the first, third, fifth and seventh strokes or the second, fourth, sixth and eighth strokes are set. In other words, by means of the cam element according to the invention can be switched simultaneously between the first, third, fifth and seventh and the second, fourth, sixth and eighth stroke. The cam element according to the invention is thus used to operate the four gas exchange valves of the two mutually different cylinders simultaneously and at the same time between the switch respective strokes, so that a particularly space-and weight-favorable Hubumschaltung can be realized.

Switching from the first, third, fifth and seventh strokes to the second, fourth, sixth and eighth strokes is also referred to as stroke switching. Since by means of the cam member, the four gas exchange valves can be switched simultaneously between their different strokes, the number of parts and thus the space requirements, the cost and weight of the reciprocating internal combustion engine can be kept particularly low.

Preferably, it is provided that the first stroke, the third stroke, the fifth stroke and the seventh stroke are the same. Furthermore, it is preferably provided that the second stroke, the fourth stroke, the sixth stroke and the eighth stroke are the same. This allows a particularly advantageous, simultaneous switching of operating states of the cylinder can be realized, so that a particularly efficient and effective operation of the reciprocating internal combustion engine can be realized. Preferably, the link is arranged in the axial direction and thus along the axis of rotation between the cam pairs, whereby a particularly space-saving displacement of the cam element can be realized.

In an advantageous embodiment of the invention, the gate on a first slide track, in which an actuating element is movable, thereby to move the cam member from the first position to the second position. As a result, a particularly space-saving displacement can be realized.

In order to keep the space requirement particularly low, it is provided in a further embodiment of the invention that the gate has a second slide track into which an actuating element is movable to thereby move the cam member from the second position to the first position.

In order to keep the number of parts and thus the costs particularly low, it is provided in a further embodiment of the invention that the cams are integrally formed with each other.

As further particularly advantageous, it has been shown that the cams are integrally formed with the backdrop. This allows the costs to be kept to a particularly low level. In particular, it is provided, for example, that the cam element is formed integrally overall.

In order to realize a particularly space-saving Hubumschaltung, it is provided in a further embodiment of the invention, that the link has at least one obliquely to the circumferential direction of the cam member extending length range, by means of which the displacement of the cam member is effected by an actuating element at about the axis of rotation rotating cam element engages in the length range. In other words, at least the length region extends in a plane which extends obliquely to the axis of rotation about which the camshaft and thus the cam element and the cams are rotatable or rotate during operation of the reciprocating internal combustion engine. The cam member is translationally movable relative to the camshaft along a direction of movement between the positions, wherein the movement direction is parallel to the axial direction of the camshaft or coincides with the axial direction.

At least the length region of the slide extends, for example, arcuately and thus at least in a partial area obliquely to the circumferential or rotational direction in which the cam member are rotatable about the axis of rotation. Then, for example, engages the actuator in the length range, while the cam member and thus the gate are rotated about the axis of rotation, so at least one at least the length range at least partially limiting and thus extending in said plane wall region of the scenery, which at least partially along the axial Direction of the camshaft and thus of the cam member is limited by the wall region, in support system with engaging in the length range actuator. Due to the oblique course of the length region or the wall region results from the support system and the fact that the cam member is rotated about the axis of rotation relative to the actuating element, while the actuating element engages the link, a force or a force component along the direction of movement in one direction acts. By means of this acting in the direction of the force component, the cam member is displaced in the direction relative to the camshaft and thereby moved, for example, from the first position to the second position or vice versa.

It has been found to be particularly advantageous if an actuator is provided, by means of which the actuating element is movable in a direction perpendicular to the axis of rotation direction in the length range. By moving the actuator in the length range, the actuator engages the backdrop, so that by means of the actuator a particularly needs-based Displacement of the cam element is effected. If a displacement of the cam element is omitted, the actuating element is not moved into the length range, so that the actuating element does not engage in the length range.

A second aspect of the invention relates to a reciprocating internal combustion engine for a motor vehicle, in particular for a motor vehicle such as a passenger car. The reciprocating internal combustion engine is also referred to as an internal combustion engine or internal combustion engine and comprises a first cylinder, which is a first combustion chamber of the internal combustion engine. Furthermore, the reciprocating internal combustion engine comprises a first gas exchange valve associated with the first cylinder and a second gas exchange valve associated with the first cylinder. In addition, the reciprocating internal combustion engine comprises a second cylinder, which is a second combustion chamber of the internal combustion engine. In addition, the reciprocating internal combustion engine has a third gas exchange valve associated with the second cylinder and a fourth gas exchange valve associated with the second cylinder. The gas exchange valves are for example intake valves or exhaust valves and are used to control a so-called charge change of the respective cylinder. During a fired operation of the reciprocating internal combustion engine, combustion processes occur in the combustion chambers (in the cylinders). As part of such a combustion process, a fuel-air mixture is burned.

The internal combustion engine further comprises at least one about an axis of rotation, in particular relative to the gas exchange valves, rotatable camshaft, by means of which the gas exchange valves are actuated. As part of the actuation of the respective gas exchange valve, the respective gas exchange valve is opened, for example. The gas exchange valve is closed, for example, by means of a respective associated spring.

In order to realize a need-based Hubumschaltung in a particularly space, weight and cost-effective manner, the reciprocating internal combustion engine according to the invention arranged on the camshaft and rotatably connected to the camshaft cam member which is driven by the camshaft, for example, and so with the Camshaft about the axis of rotation, in particular relative to the gas exchange valves, rotates. Preferably, the cam element is designed as a cam element according to the invention.

The cam member comprises a first cam pair with a first cam and a second cam. By means of the first cam, a first stroke of the first gas exchange valve can be effected. By means of the second cam is different from the first stroke, second stroke of the first gas exchange valve effected. The cam member further includes a second cam pair having a third cam and a fourth cam. By means of the third cam, a third stroke of the second gas exchange valve can be effected, wherein by means of the fourth cam a fourth stroke different from the third stroke of the second gas exchange valve can be effected. The first cam pair is thus associated with the first gas exchange valve of the first cylinder, wherein the second cam pair is associated with the second gas exchange valve of the first cylinder. Thus, by means of the first and second cam pair, a Hubumschaltung the gas exchange valves of the first cylinder can be effected.

The cam member further includes a third cam pair having a fifth cam and a sixth cam. By means of the fifth cam, a fifth stroke of the third gas exchange valve of the second cylinder can be effected. By means of the sixth cam of the fifth stroke different sixth stroke of the third gas exchange valve of the second cylinder is effected. In addition, the cam member has a fourth cam pair with a seventh cam and with an eighth cam. By means of the seventh cam, a seventh stroke of the fourth gas exchange valve of the second cylinder is effected, wherein by means of the eighth cam a different stroke of the seventh stroke of the fourth gas exchange valve of the second cylinder can be effected. The third cam pair is thus associated with the third gas exchange valve of the second cylinder, wherein the fourth cam pair is associated with the fourth gas exchange valve of the second cylinder. Thus, by means of the third and fourth cam pair, a Hubumschaltung the gas exchange valves of the second cylinder can be effected.

In this case, the first cam pair and the second cam pair form a first cam group of the cam element, wherein the third cam pair and the fourth cam pair form a second cam group of the cam member. The cam member further comprises a, in particular in the axial direction of the camshaft, arranged between the cam groups backdrop, by means of which the cam member and thus the cam simultaneously in the axial direction of the camshaft relative thereto between a first position for adjusting the first, third, fifth and seventh stroke and a second position for adjusting the second, fourth, sixth and eighth stroke of the gas exchange valves are displaceable. Advantages and advantageous embodiments of the first aspect of the invention are to be regarded as advantages and advantageous embodiments of the second aspect of the invention, and vice versa.

Further details of the invention will become apparent from the following description of a preferred embodiment with the accompanying drawings. This shows in the only Fig. A schematic perspective view of a cam element according to the invention with four cam pairs ä two cams, by means of which different strokes of a respective gas exchange valve can be effected.

The single FIGURE shows a schematic perspective view of a generally designated 1 cam member for a rotatable about a rotation axis camshaft of a reciprocating internal combustion engine. The reciprocating internal combustion engine is part of an example, as a motor vehicle, especially as a passenger car, trained motor vehicle, which is driven by the reciprocating internal combustion engine. In this case, the reciprocating internal combustion engine comprises a first cylinder and a second cylinder, which are respective combustion chambers of the reciprocating internal combustion engine. During a fired operation of the reciprocating internal combustion engine, combustion processes occur in the cylinders. In the course of such a combustion process, a fuel-air mixture is burned.

Furthermore, a piston is received translationally movable in the respective cylinder. Furthermore, the reciprocating internal combustion engine comprises a crankshaft designed as an output shaft which is rotatably mounted on a housing element of the reciprocating internal combustion engine about a second axis of rotation relative to the housing member. The axes of rotation run, for example, at least substantially parallel to one another, wherein, for example, the camshaft, in particular via a drive system, can be driven by the crankshaft. About the crankshaft, the reciprocating internal combustion engine, which is also referred to as an internal combustion engine or internal combustion engine, torques for driving the motor vehicle ready. The respective pistons are pivotally coupled to the crankshaft via respective connecting rods, so that the translational movements of the pistons in the cylinders are converted into a rotational movement of the crankshaft about their axis of rotation.

The first cylinder is associated with a first gas exchange valve and a second gas exchange valve, wherein the second cylinder, a third gas exchange valve and a fourth gas exchange valve are assigned. Thus, the reciprocating internal combustion engine comprises at least four gas exchange valves. The gas exchange valves are for example intake valves or exhaust valves of the respective cylinder. In particular, the reciprocating internal combustion engine is designed as a 4-valve engine, so that at least four gas exchange valves are assigned to the respective cylinder. Of these four gas exchange valves, for example, two gas exchange valves are designed as inlet valves and two gas exchange valves as exhaust valves. The cam element 1 and the reciprocating internal combustion engine are explained below using the example of the first, second, third and fourth gas exchange valve.

The aforementioned camshaft is used to actuate the respective gas exchange valve. Under such an operation of the respective gas exchange valve is to be understood, for example, that the gas exchange valve is opened. The respective gas exchange valve is movable, for example, translationally between a closed position and two different open positions. If, for example, the gas exchange valve is moved from the closed position into the respective open position with the aid of the camshaft, a spring associated with the respective gas exchange valve is thereby tensioned. As a result, for example, the respective gas exchange valve can be closed by means of the spring, that is, moved from the respective open position into the closed position and held in particular in the closed position.

In the course of its movement from the closed position into the respective open position, the respective gas exchange valve executes a stroke. As will be explained in more detail below, the cam element shown in FIG 1 used to switch between the respective strokes of the respective gas exchange valve, in particular at the same time, wherein by means of the cam member 1 a space-saving, low cost and low weight Hubumschaltung can be realized. As Hubumschaltung the switching between the strokes of the respective gas exchange valve is referred to, wherein the four gas exchange valves of the two cylinders can be switched simultaneously between their strokes.

For this purpose, the cam element 1 a first cam pair 2 with a first cam 3 and a fourth cam 4 on. By means of the first cam 3 is a first stroke of the first gas exchange valve of the first cylinder effected. By means of the second cam 4 is one of the first stroke different and present compared to the first stroke larger, second stroke of the first gas exchange valve of the first cylinder effected.

The cam element 1 also has a second cam pair 5 with a third cam 6 and a fourth cam 7 on. By means of the third cam 6, a third stroke of the second gas exchange valve of the first cylinder can be effected, wherein by means of the fourth cam 7 one from the third hub different and in the present case with respect to the third stroke larger fourth stroke of the second gas exchange valve of the first cylinder is effected.

The cam element 1 also includes a third pair of cams 8th with a fifth cam 9 and with a sixth cam 10 , By means of the fifth cam 9 is a fifth stroke of the third gas exchange valve of the second cylinder effected. By means of the sixth cam 10 is one of the fifth stroke different and presently opposite the fifth stroke larger sixth stroke of the third gas exchange valve of the second cylinder effected. In addition, the cam element 1 a fourth pair of cams 11 with a seventh cam 12 and an eighth cam 13 on. By means of the seventh cam 12 is a seventh stroke of the fourth gas exchange valve of the second cylinder effected, wherein by means of the eighth cam 13 a seventh different and in this case compared with the seventh stroke larger eighth stroke of the fourth gas exchange valve of the second cylinder is effected. In the finished state of the reciprocating internal combustion engine is the cam element 1 arranged on the rotatable about the aforementioned first axis of rotation camshaft and rotatably connected to the camshaft, so that the cam member 1 is driven by the camshaft and rotates together with the camshaft about the first axis of rotation. Thus, the cams rotate 3 . 4 , 6, 7, 9, 10, 12 and 13 together about the axis of rotation. The cam element 1 is displaceable in the axial direction of the camshaft relative to this. Thus, the cam element 1 along one in the figure by a double arrow 14 illustrated movement direction relative to the camshaft 1 translationally movable, that is displaceable, wherein the movement direction coincides with the first axis of rotation or with the axial direction of the camshaft. In other words, the direction of movement runs, for example, at least substantially parallel to the first axis of rotation or parallel to the axial direction of the camshaft.

Overall, it can be seen from the figure that the cam pairs 2 and 5 the first cylinder or the gas exchange valves of the first cylinder and the cam pairs 8th and 11 are associated with the second cylinder or the gas exchange valves of the second cylinder. Thus, the cam pairs become 2 and 5 used to operate the first and second gas exchange valve of the first cylinder, wherein the pairs of cams 8th and 11 be used to operate the third and fourth gas exchange valve of the second cylinder. The cam pairs form 2 and 5 a first cam group 15 which are the cams 3 . 4 , 6 and 7. In addition, the cam pairs form 8th and 11 a second cam group 16 which are the cams 9 . 10 . 12 and 13 includes.

In addition, the cam element 1 a backdrop 17 on, by means of which the cam element 1 along the direction of movement and thus in the axial direction of the camshaft relative thereto between a first position for adjusting the first, third, fifth and seventh stroke and a second position for adjusting the second, fourth, sixth and eighth stroke of the gas exchange valves is displaceable. Here is the backdrop 17 in the axial direction or along the direction of movement between the cam groups 15 and 16 arranged. The scenery 17 includes, for example, a first slide track 18 and a second slide track 19 , As will be explained in more detail below, for example, in the slide track 18 a first actuator movable to thereby the cam member 1 move from the first position to the second position. In the slide railway 19 For example, a second actuator is movable to thereby the cam member 1 move from the second position to the first position.

In this case, the reciprocating internal combustion engine comprises a backdrop 17 associated actuator, not shown in the figure, which, for example, is electrically operable. The actuator comprises the actuating elements, which are designed, for example, as pins or pins. The respective actuating element is translationally movable in a direction perpendicular to the axis of rotation, in particular by means of an electromagnet of the actuator. The respective actuating element is, for example, between an actuating position and an initial position relative to the cam element 1 perpendicular to the axial direction of the camshaft and thus perpendicular to the first axis of rotation movable. In the operating position, the respective actuating element engages in the respective associated slide track 18 respectively 19 one. In the initial position, however, the respective actuator does not engage in the slide tracks 18 and 19 one. For example, the first actuating element of the slide track 18 assigned, wherein the second actuating element of the slide track 19 assigned.

For example, the first located in the first position cam member 1 move from the first position to the second position, the first actuating element by means of the actuator is at least partially in the slide track 18 moved in, so that the first actuator in the slide track 18 intervenes. For example, the cam element 1 From the second position to move to the first position, for example, the second actuator by means of the actuator at least partially in the slide track 19 moves, so then the second actuator in the slide track 19 intervenes. The respective slide track 18 respectively 19 is at least in a length range formed such that at least the length range is arcuate. Thus, the length range extends at least partially obliquely to the circumferential direction or at least the length range extends in a plane which extends obliquely to the axis of rotation of the camshaft. In particular, for example, the length region is at least substantially S-shaped. Thus, for example, accesses the respective actuating element in the respective associated slide track 18 respectively 19 a, while the cam element 1 is rotated about the axis of rotation, so at least one of the length range at least partially along the direction of movement delimiting and extending obliquely to the circumferential direction or in the plane wall region of the cam member 1 in support system with the respective, located in the operating position actuator. Due to the oblique course of the wall region, the support system of the actuating element with the wall region results in a force or a force component acting along the direction of movement. By means of this force is then the cam element 1 shifted from the first position to the second position or from the second position to the first position relative to the camshaft. As a result, a particularly space-saving switching between the strokes can be realized.

Overall, it can be seen that the cams 3 . 4 , 6, 7, 9, 10, 12 and 13 are shifted simultaneously, so that at the same time from the first, third, fifth and seventh stroke to the second, fourth, sixth and eighth stroke is switched or vice versa. For example, the first stroke, the third stroke, the fifth and the seventh stroke are at least substantially the same, and preferably the second stroke, the fourth stroke, the sixth stroke, and the eighth stroke are at least substantially equal. The first, third, fifth and seventh stroke is set, for example, at partial load of the reciprocating internal combustion engine, for example, the second, fourth, sixth and eighth stroke is set at full load of the reciprocating internal combustion engine. As a result, a particularly needs-based and thus more efficient and effective operation of the reciprocating engine can be realized.

Characterized in that the four gas exchange valves of the two cylinders by means of a cam member 1 operated simultaneously, that is, can be switched in their strokes, the number of actuators and cam elements of the reciprocating internal combustion engine can be kept particularly low, so that their number of parts, weight, space requirements and costs can be kept in a very small frame.

Because the cam element 1 is displaceable between the positions relative to the camshaft, the cam member 1 also called cam piece, sliding piece or switching cam. Further, since not only the gas exchange valves of the first cylinder, but also the gas exchange valves of the second cylinder can be switched in their strokes, the cam element 1 Also referred to as a double sliding piece.

LIST OF REFERENCE NUMBERS

1

cam member

2

cam pair

3

cam

4

cam

5

cam pair

7

cam

8th

cam pair

9

cam

10

cam

11

cam pair

12

cam

13

cam

14

double arrow

15

cam group

16

cam group

17

scenery

18

link path

19

link path

Claims (8)

A cam member (1) for a rotary shaft rotatable camshaft of a reciprocating internal combustion engine, comprising a first cam pair (2) having a first cam (3) for effecting a first stroke and a second cam (4) for effecting a different from the first stroke second stroke of a first gas exchange valve, with a second cam pair (5) having a third cam (6) for effecting a third stroke and a fourth cam (7) for effecting a different from the third stroke fourth stroke of a second gas exchange valve, with a third cam pair (8) having a fifth cam (9) for effecting a fifth stroke and a sixth cam (10) for effecting a sixth hub of a third gas exchange valve different from the fifth stroke, with a fourth cam pair (11) which is a seventh Cams (12) for effecting a seventh stroke and an eighth cam (13) for effecting a different from the seventh stroke n eighth hubs one fourth gas exchange valve, wherein the first cam pair (2) and the second cam pair (5) a first cam group (15) and the third cam pair (8) and the fourth cam pair (11) form a second cam group (16), and wherein the the camshaft can be arranged and rotatably connected to the camshaft cam member (1) has a between the cam groups (15, 16) arranged gate (17), by means of which the cam member (1) in the axial direction (14) of the camshaft relative to this between a first Position for adjusting the first, third, fifth and seventh stroke and a second position for adjusting the second, fourth, sixth and eighth stroke of the gas exchange valves is displaceable. Cam element (1) after Claim 1 , characterized in that the link (17) has a first slide track (18) into which an actuating element is movable to thereby move the cam member (1) from the first position to the second position. Cam element (1) after Claim 2 , characterized in that the link (17) has a second slide track (19), in which an actuating element is movable, thereby to move the cam member (1) from the second position to the first position. Cam element (1) according to one of the preceding claims, characterized in that the cams (3, 4, 6, 7, 9, 10, 12, 13) are formed integrally with each other. Cam element (1) according to one of the preceding claims, characterized in that the cams (3, 4, 6, 7, 9, 10, 12, 13) are formed integrally with the link (17). Cam element (1) according to one of the preceding claims, characterized in that the link (17) has at least one obliquely to the circumferential direction of the cam member (1) extending length range, by means of which the displacement of the cam member (1) is effected by an actuating element in itself engages around the axis of rotation rotating cam member (1) in the length range. Cam element (1) after Claim 6 , characterized in that an actuator is provided, by means of which the actuating element is movable in a direction perpendicular to the axis of rotation direction in the length range. Reciprocating internal combustion engine for a motor vehicle, comprising a first cylinder, with a first cylinder associated with the first gas exchange valve, with a first cylinder associated second gas exchange valve, with a second cylinder, with the second cylinder associated third gas exchange valve, with a second cylinder fourth gas exchange valve, and with at least one about an axis of rotation rotatable camshaft for actuating the gas exchange valves, characterized by a cam shaft arranged on the camshaft and non-rotatably connected to the camshaft cam member (1), comprising: - a first cam pair (2) with a first cam ( 3) for effecting a first stroke and a second cam (4) for effecting a second stroke of the first gas exchange valve different from the first stroke; - a second cam pair (5) having a third cam (6) for effecting a third stroke and a fourth cam (7) for effecting a fourth stroke different from the third stroke of the second gas exchange valve; a third cam pair (8) having a fifth cam (9) for effecting a fifth stroke and a sixth cam (10) for effecting a sixth stroke of the third gas exchange valve different from the fifth stroke; a fourth cam pair (11) having a seventh cam (12) for effecting a seventh stroke and an eighth cam (13) for effecting an eighth stroke of the fourth gas exchange valve different from the seventh stroke, the first cam pair (2) and the second cam pair (5) a first cam group (15) and the third cam pair (8) and the fourth cam pair (11) form a second cam group (16); and - a between the cam groups (15, 16) arranged gate (17), by means of which the cam member (1) in the axial direction of the cam shaft relative thereto between a first position for adjusting the first, third, fifth and seventh stroke and a second Position for adjusting the second, fourth, sixth and eighth stroke of the gas exchange valves is displaceable.

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