VALVE CONTROL

Abstract

A valve control for an internal combustion engine may include a tilt lever, a cam shaft, two cam groups arranged on the cam shaft, a roller bolt arranged on the tilt lever, and an adjusting assembly including a switching pin that engages through the roller bolt. The roller bolt may include two rotatable rollers. The switching pin may be adjustable into a switching position and into a home position. The switching pin may cooperate with a slotted guide of the cam shaft when in the switching position and may have no contact with the slotted guide when in the home position. When the switching pin is in the switching position, the two rollers may be axially adjustable via the adjusting assembly. The switching pin may be axially movable in the roller bolt and the two rollers may be axially movable on the roller bolt into one of two roller positions.

Claims

1. A valve control for an internal combustion engine, comprising: a tilt lever axis and a tilt lever rotatably mounted on the tilt lever axis; a cam shaft mounted axially parallel to the tilt lever axis; two cam groups arranged on the cam shaft axially spaced apart from one another, the two cam groups each including two axially adjacent cams; a roller bolt arranged on the tilt lever axially parallel to the tilt lever axis, the roller bolt including two rotatable rollers disposed axially spaced apart from one another; an adjusting assembly including a switching pin which engages through the roller bolt, the switching pin adjustable radially relative to the roller bolt into a switching position and into a home position; wherein the switching pin cooperates with a slotted guide disposed on the cam shaft when in the switching position and has no contact with the slotted guide when in the home position, wherein, when the switching pin is in the switching position the two rollers are axially adjustable between two roller positions via the adjusting assembly; wherein, when in a first roller position of the two roller positions, the two rollers are drive-connected to a first cam of the two cams of each of the two cam groups; wherein, when in a second roller position of the two roller positions, the two rollers are drive-connected to a second cam of the two cams of each of the two cam groups; wherein the switching pin is arranged between the two rollers and is arranged in an axially movable manner in the roller bolt; wherein the slotted guide is coupled to the cam shaft in a rotationally fixed manner between the two cam groups; and wherein the roller bolt is axially fixed, the two rollers are arranged in an axial movable manner on the roller bolt, and the two rollers are axially coupled with the switching pin such that, when the switching pin is in the switching position, the switching pin is axially movable in the roller bolt and the two rollers are axially movable on the roller bolt into one of the two roller positions.

2. The valve control according to claim 1, wherein: the two rollers are secured to a roller sleeve spaced apart from one another, the roller sleeve is axially movable on the roller bolt, and the switching pin is axially secured to the roller sleeve; and when the switching pin is in the switching position, the roller sleeve is axially movable on the roller bolt into a first sleeve position and into a second sleeve position via the switching pin; and the first sleeve position and the second sleeve position of the roller sleeve correspond to the first roller position and the second roller position of the two rollers respectively.

3. The valve control according to claim 2, further comprising a sleeve latching unit, wherein: the roller sleeve is held in one of the first sleeve position and the second sleeve position via the sleeve latching unit; the sleeve latching unit includes at least one spring and at least one latching element; and the at least one spring and the at least one latching element are secured inside the roller bolt and cooperate with the roller sleeve radially relative to the roller bolt.

4. The valve control according to claim 2, further comprising a pin latching unit, wherein: when in the home position and when in the switching position, the switching pin is held via the pin latching unit; the pin latching unit includes at least one spring and at least one latching element; and the at least one spring and the at least one latching element are secured to and axially movable with the roller sleeve and cooperate with the switching pin transversely to a longitudinal central axis of the switching pin.

5. The valve control according to claim 2, further comprising a pressure latching unit, wherein: when in the home position and when in the switching position, the switching pin is held via the pressure latching unit; the pressure latching unit includes at least one pressure piece; and the at least one pressure piece is secured to and axially movable with the roller sleeve and cooperate with the switching pin transversely to a longitudinal central axis of the switching pin.

6. The valve control according to claim 1, wherein: the switching pin is axially secured in a moving bolt, the moving bolt mounted in an axially movable manner on the tilt lever axially parallel to the tilt lever axis; when the switching bolt is in the switching position, the moving bolt is axially movable into a first bolt position and into a second bolt position via the switching pin; and the first bolt position and the second bolt position of the moving bolt correspond to the first roller position and the second roller position of the two rollers respectively.

7. The valve control according to claim 6, wherein: the two rollers are secured to a roller sleeve spaced apart from one another; the roller sleeve is axially movable on the roller bolt; and the switching pin is axially secured to the roller sleeve such that the two rollers are movable into the two roller positions via adjusting the moving bolt.

8. The valve control according to claim 6, wherein the two rollers are mounted in an axially movable manner on the roller bolt and are encompassed in at least some areas by an entraining unit secured to the moving bolt such that, when adjusting the moving bolt, the two rollers are entrainable via the entraining unit and are adjustable into the two roller positions.

9. The valve control according to claim 8, wherein: at least one roller of the two rollers is encompassed in at least some areas via two stop surfaces of the entraining unit; the two stop surfaces extend radially and are disposed spaced apart from one another; and an axial distance between the two stop surfaces defines an axial functional play of the at least one roller.

10. The valve control according to claim 8, wherein the entraining unit is structured as a single, unitary piece.

11. The valve control according to claim 10, wherein the entraining unit is embodied as a sheet metal entraining unit.

12. The valve control according to claim 6, further comprising a fork-like lever holder, wherein the moving bolt is mounted in an axially movable manner in the fork-like lever holder and is arranged axially inside the fork-like lever holder when in the first bolt position and when in the second bolt position.

13. The valve control according to claim 12, wherein: a first longitudinal end of the moving bolt is mounted in a rotationally fixed and in a form-fitting manner in the fork-like lever holder via a securing member; and a second longitudinal end of the moving bolt is held in the fork-like lever holder in one of the first bolt position and the second bolt position via a bolt latching unit.

14. The valve control according to claim 6, wherein: when in the home position and when in the switching position, the switching pin is via a pin latching unit; the pin latching unit includes at least one spring and at least one latching element; and the at least one spring and the at least one latching unit are secured inside the moving bolt and cooperate with the switching pin, transversely to a longitudinal central axis of the switching pin.

15. The valve control according to claim 1, wherein the switching pin cooperates with the slotted guide via an elongated hole disposed in the roller bolt.

16. The valve control according to one of claim 1, wherein the slotted guide laterally abuts against a cam of a first group of the two cam groups and against a cam of a second group of the two cam groups, the cam of the first cam group disposed adjacent to the cam of the second cam group.

17. The valve control according to claim 1, characterized in that wherein the slotted guide includes an X-shaped guide groove.

18. A valve control for an internal combustion engine, comprising: a tilt lever axis and a tilt lever rotatably mounted on the tilt lever axis; a cam shaft mounted axially parallel to the tilt lever axis; two cam groups arranged on the cam shaft axially spaced apart from one another, the two cam groups each including two axially adjacent cams; a roller bolt arranged on the tilt lever axially parallel to the tilt lever axis, the roller bolt including two rotatable rollers disposed axially spaced apart from one another; an adjusting assembly including a switching pin which engages through the roller bolt, the switching pin adjustable radially relative to the roller bolt into a switching position and into a home position; wherein the switching pin cooperates with a slotted guide disposed on the cam shaft when in the switching position and has no contact with the slotted guide when in the home position; wherein, when the switching pin is in the switching position, the two rollers are axially adjustable between two roller positions via the adjusting assembly; wherein, when in a first roller position of the two roller positions, the two rollers are drive-connected to a first cam of the two cams of each of the two cam groups; wherein, when in a second roller position of the two roller positions, the two rollers are drive-connected to a second cam of the two cams of each of the two cam groups; wherein the switching pin is arranged between the two rollers and is arranged in an axially movable manner in the roller bolt; wherein the slotted guide is coupled to the cam shaft in a rotationally fixed manner between the two cam groups; wherein the roller bolt is axially fixed, the two rollers are arranged in an axial movable manner on the roller bolt, and the two rollers are axially coupled with the switching pin such that, when the switching pin is in the switching position, the switching pin is axially movable in the roller bolt and the two rollers are axially movable on the roller bolt into one of the two roller positions; wherein the slotted guide laterally abuts against a cam of a first group of the two cam groups and against a cam of a second group of the two cam groups, the cam of the first cam group disposed adjacent to the cam of the second cam group; and wherein the slotted guide includes an X-shaped guide groove.

19. The valve control according to claim 18, wherein: the switching pin is axially secured in a moving bolt, the moving bolt mounted in an axially movable manner on the tilt lever axially parallel to the tilt lever axis; when the switching bolt is in the switching position, the moving bolt is axially movable into a first bolt position and into a second bolt position via the switching pin; and the first bolt position and the second bolt position of the moving bolt correspond to the first roller position and the second roller position of the two rollers respectively.

20. A valve control for an internal combustion engine, comprising: a tilt lever axis and a tilt lever rotatably mounted on the tilt lever axis; a cam shaft mounted axially parallel to the tilt lever axis; two cam groups arranged on the cam shaft axially spaced apart from one another, the two cam groups each including two axially adjacent cams; a roller bolt arranged on the tilt lever axially parallel to the tilt lever axis, the roller bolt including two rotatable rollers disposed axially spaced apart from one another; an adjusting assembly including a switching pin which engages through the roller bolt, the switching pin adjustable radially relative to the roller bolt into a switching position and into a home position; wherein the switching pin cooperates with a slotted guide disposed on the cam shaft when in the switching position and has no contact with the slotted guide when in the home position; wherein, when the switching pin is in the switching position, the two rollers are axially adjustable between two roller positions via the adjusting assembly; wherein, when in a first roller position of the two roller positions, the two rollers are drive-connected to a first cam of the two cams of each of the two cam groups; wherein, when in a second roller position of the two roller positions, the two rollers are drive-connected to a second cam of the two cams of each of the two cam groups; wherein the switching pin is arranged between the two rollers and is arranged in an axially movable manner in the roller bolt; wherein the slotted guide is coupled to the cam shaft in a rotationally fixed manner between the two cam groups; wherein the roller bolt is axially fixed, the two rollers are arranged in an axial movable manner on the roller bolt, and the two rollers are axially coupled with the switching pin such that, when the switching pin is in the switching position, the switching pin is axially movable in the roller bolt and the two rollers are axially movable on the roller bolt into one of the two roller positions; wherein the switching pin cooperates with the slotted guide via an elongated hold disposed in the roller bolt; and wherein the slotted guide includes an X-shaped guide groove.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In each case schematically,

[0019] FIG. 1 shows a view of a valve control according to the invention in a first embodiment;

[0020] FIGS. 2 and 3 show further views of the valve control according to the invention in the first embodiment;

[0021] FIGS. 4 and 5 show detail views of the valve control according to the invention in the first embodiment;

[0022] FIG. 6 shows a detail view of the valve control according to the invention in a second embodiment;

[0023] FIG. 7 shows a detail view of the valve control according to the invention in a third embodiment;

[0024] FIG. 8 shows a sectional view through a roller bolt in the valve control in the third embodiment;

[0025] FIG. 9 shows a further sectional view through a roller bolt in the valve control in the third embodiment;

DETAILED DESCRIPTION

[0026] FIG. 1 shows a view of a valve control 1 according to the invention in a first embodiment. FIG. 2 and FIG. 3 show further views of the valve control 1 according to the invention from FIG. 1. Detail views of the valve control 1 according to the invention from FIG. 1 to FIG. 3 are shown in FIG. 4 and FIG. 5.

[0027] With reference to FIG. 1 to FIG. 5, the valve control 1 according to the invention has a tilt lever axis 2 and a tilt lever 3, which is rotatably mounted on the tilt lever axis 2. The valve control 1 further has a cam shaft 4, which is mounted axially parallel to the tilt lever axis 2. A first cam group 5 comprising two axially adjacent cams 5a and 5b and a second cam group 6 comprising two axially adjacent cams 6a and 6b is arranged on the cam shaft 4. The cam groups 5 and 6 are axially spaced apart from one another. A slotted guide 7, on which an X-shaped guide groove 8 is formed, is arranged between the cam groups 5 and 6. The slotted guide 7 laterally abuts against the respective cams 5b and 6a and can also be embodied in one piece therewith.

[0028] The valve control 1 further has a roller bolt 9 comprising two rotatable rollers 9a and 9b, which are axially spaced apart from one another. The roller bolt 9 is thereby secured in a fork-like lever holder 10 of the tilt lever 3 so as to be axially parallel to the tilt lever axis 2. In the case of the first embodiment of the valve control 1, the rollers 9a and 9b are mounted in an axially movable manner on the roller bolt 9 and can be axially adjusted between two roller positions. In the respective roller position, the rollers 9a and 9b are alternately drive-connected to a respective one of the cams 5a or 5b and 6a or 6b of the respective cam group 5 and 6. In FIG. 1 and FIG. 2, the respective rollers 9a and 9b cooperate with the respective cams 5a and 6a, and with the respective cams 5b and 6b in FIG. 3. In FIG. 1 and FIG. 2, the rollers 9a and 9b are thus in the other roller position than in FIG. 3. The cams 5a and 6a thereby have different groove profiles to the cams 5b and 6b, so that the rollers 9a and 9b perform a different lifting movement, depending on the roller position, and suitably transfer said lifting movement to the tilt lever 3.

[0029] The valve control 1 furthermore has an adjusting assembly 11 comprising a switching pin 13, which engages through an elongated hole 12 of the roller bolt 9 and which can be adjusted into a switching position and into a home position radially to the roller bolt 9. In the switching position, the switching pin 13 cooperates with the slotted guide 7 and has no contact therewith in the home position. In the case of the first embodiment of the valve control 1, the switching pin 13 is axially secured in a moving bolt 14 and is mounted in the latter in a radially adjustable manner. The moving bolt 14 is thereby mounted axially parallel to the tilt lever axis 2 and in an axially movable manner in the lever holder 10 of the tilt lever 3. In the switching position, the switching pin 13 cooperates with the guide groove 8 and is moved axially to the tilt lever axis 2 by means of the moving bolt 14. The moving bolt 14 is thus axially adjusted into one of the two bolt positions. In response to the adjustment into the respective bolt position, the moving bolt 14 entrains the two rollers 9a and 9b and moves them out of the one roller position into the other roller position. For this purpose, an entraining unit 15, which laterally encompasses the rollers 9a and 9b, is secured to the moving bolt 14.

[0030] FIG. 6 shows a detail view of the valve control 1 according to the invention in a second embodiment. The two rollers 9a and 9b are axially secured to a roller sleeve 16 here, and the roller sleeve 16 is mounted in an axially movable manner on the roller bolt 9. The switching pin 13 is thereby axially secured to the roller sleeve 16 and, in the switching position, then axially moves the roller sleeve 16 into a first sleeve position and into a second sleeve position. The respective sleeve position of the roller sleeve 16 thereby corresponds to the respective roller position of the two rollers 9a and 9b. In the second embodiment of the valve control 1, the entraining unit 15 can thus be forgone, so that the entrained weight is reduced in the valve control 1. The valve control 1 in the second embodiment moreover corresponds to the valve control 1 in the first embodiment shown in FIG. 1 to FIG. 5.

[0031] In the first and in the second embodiment, the moving bolt 14 is thereby mounted in such a way and is so short that it does not protrude from the lever holder 10 of the tilt lever 3 in its bolt position. The installation space requirement for the valve control 1 according to the invention is thus significantly reduced.

[0032] FIG. 7 shows a detail view of the valve control 1 according to the invention in a third embodiment. Here, the switching pin 13 is mounted in the roller bolt 9 so as to be axially movable in the elongated hole 12 and so as to be radially adjustable into the switching position and into the home position. In the third embodiment of the valve control 1, the moving bolt 14 can be forgone, so that the valve control is further simplified. As in the second embodiment of the valve control 1, the two rollers 9a and 9b are axially secured to the roller sleeve 16 here, so that the roller sleeve 16 is axially adjusted into the respective sleeve position, and the rollers 9a and 9b arranged on said roller sleeve are axially adjusted into the respective roller position when axially guiding the switching pin 13 in the guide groove 8. In the third embodiment, the valve control 1 moreover corresponds to the valve control 1 in the second embodiment shown in FIG. 1 to FIG. 5.

[0033] No moving bolt 14 is provided in the third embodiment of the valve control 1, so that the mass, which is to be moved, and the necessary installation space are advantageously reduced.

[0034] FIG. 8 shows a sectional view through the roller bolt 9 in the valve control 1 in the third embodiment. A pin latching unit 17 is shown here, which holds the switching pin 13 in the home position and in the switching position. The pin latching unit 17 thereby has a spring 18 and a latching element 19, which are secured to the roller sleeve 16 and which, transversely to the longitudinal central axis L of the switching pin 13, cooperate with the latter. The switching pin 13 is shown in the switching position in FIG. 8.

[0035] FIG. 9 shows a further sectional view through the roller bolt 9 in the valve control 1 in the third embodiment. The sleeve latching unit 20 is shown here, which holds the roller sleeve 16 in the respective sleeve position. The sleeve latching unit 20 thereby has a spring 21 and two latching elements 22, which are secured inside the roller bolt 9 and which cooperate with the roller sleeve 16 radially to the roller bolt 9.

[0036] In summary, the installation space requirement for the valve control 1 according to the invention is reduced, so that the valve control 1 is also realized in the case of small cylinder spacings as well as in the case of SOHC engines. The valve control 1 is thereby embodied in a robust and simple way, and the number of the components as well as the mass, which is to be moved, are reduced in an advantageous manner.