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, the valve control comprising: a tilt lever shaft and a tilt lever rotatably mounted on the tilt lever shaft; a cam shaft extending parallel to the tilt lever shaft; two cam groups arranged on the cam shaft axially spaced apart from each other, the two cam groups each including a first cam and an axially adjacent second cam; a roller bolt fixed to the tilt lever and extending parallel to the cam shaft, the roller bolt including two rotatable rollers disposed axially spaced apart from each other; and an adjusting assembly including a switching pin extending perpendicularly through the roller bolt, the switching pin configured to be radially adjusted into a switching position and into a home position with respect to the roller bolt; wherein the switching pin engages a slotted guide disposed on the cam shaft when in the switching position and the switching pin is disengaged from the slotted guide when in the home position; wherein, when the switching pin is in the switching position, the two rollers are configured to be axially adjusted between two roller positions via the adjusting assembly; wherein, when the two rollers are in a first roller position of the two roller positions, the two rollers are respectively drive-connected to the first cam of each cam group; wherein, when the two rollers are in a second roller position of the two roller positions, the two rollers are respectively drive-connected to the second cam of each cam group; wherein the slotted guide is coupled to the cam shaft in a rotationally fixed manner between the two cam groups; wherein the two rollers are arranged on the roller bolt in an axially movable manner and the switching pin is arranged between the two rollers in an axially coupled manner such that the switching pin and the two rollers are configured to move as a unit with respect to an axial direction of the roller bolt; and wherein when the switching pin is in the switching position, the switching pin is moved along the axial direction of the roller bolt such that the two rollers are adjusted into one of the two roller positions.

2. The valve control according to claim 1, wherein: the two rollers are spaced apart from each other and secured to a roller sleeve configured to move along the axial direction of the roller bolt such that the switching pin is axially coupled to the two rollers via the roller sleeve; when the switching pin is in the switching position, the switching pin is configured to axially adjust the roller sleeve into a first sleeve position and into a second sleeve position with respect to the roller bolt; and the first sleeve position and the second sleeve position correspond to the first roller position and the second roller position, respectively.

3. The valve control according to claim 2, further comprising a sleeve latching unit including at least one spring and at least one latch, wherein the sleeve latching unit is secured inside the roller bolt and configured to perpendicularly engage the roller sleeve so as to alternately hold the roller sleeve in the first sleeve position and the second sleeve position.

4. The valve control according to claim 2, further comprising a pin latching unit including at least one spring and at least one latch, wherein the pin latching unit is secured to the roller sleeve and configured to perpendicularly engage the switching pin so as to alternately hold the switching pin in the switching position and the home position.

5. The valve control according to claim 2, further comprising a pressure latching unit including at least one pressure piece, wherein the pressure latching unit is secured to the roller sleeve configured to perpendicularly engage the switching pin so as to alternately hold the switching pin in the switching position and the home position.

6. The valve control according to claim 1, wherein: the switching pin is further coupled to a moving bolt, the moving bolt mounted to the in an axially movable manner and extending parallel to the roller bolt; when the switching pin is in the switching position, the switching pin is configured to axially adjust the moving bolt into a first bolt position and into a second bolt position with respect to the tilt lever; and the first bolt position and the second bolt position correspond to the first roller position and the second roller position, respectively.

7. The valve control according to claim 6, wherein: the two rollers are spaced apart from each other and secured to a roller sleeve configured to move along the axial direction of the roller bolt; and the switching pin is axially coupled to the two rollers via the roller sleeve.

8. The valve control according to claim 6, wherein each of the two rollers is at least partially encompassed by an entraining unit secured to the moving bolt such that the switching pin is axially coupled to the two rollers via the entraining unit and the moving bolt.

9. The valve control according to claim 8, wherein: at least one roller of the two rollers is at least partially encompassed by the entraining unit via two stop surfaces; the two stop surfaces are axially spaced apart from each other with respect to the moving bolt; 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 formed from sheet metal.

12. The valve control according to claim 6, wherein the moving bolt is mounted to the tilt lever via a fork-shaped lever holder of the tilt lever.

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

14. The valve control according to claim 6, further comprising a pin latching unit including at least one spring and at least one latch, wherein the pin latching unit is secured inside the moving bolt and configured to perpendicularly engage the switching pin so as to alternately hold the switching pin in the switching position and the home position.

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

16. The valve control according to claim 1, wherein an axial spacing between the two cam groups is defined by the slotted guide.

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

18. A valve control for an internal combustion engine, comprising: a tilt lever shaft and a tilt lever rotatably mounted on the tilt lever shaft; a cam shaft extending parallel to the tilt lever shaft; two cam groups arranged on the cam shaft axially spaced apart from each other, the two cam groups each including a first cam and an axially adjacent second cam; a roller bolt fixed to the tilt lever and extending parallel to the cam shaft, the roller bolt including two rotatable rollers disposed axially spaced apart from each other; and an adjusting assembly including a switching pin extending perpendicularly through the roller bolt, the switching pin configured to be radially adjusted into a switching position and into a home position with respect to the roller bolt; wherein the switching pin engages a slotted guide disposed on the cam shaft when in the switching position and the switching pin is disengaged from the slotted guide when in the home position; wherein, when the switching pin is in the switching position, the two rollers are configured to be axially adjusted between two roller positions via the adjusting assembly; wherein, when the two rollers are in a first roller position of the two roller positions, the two rollers are respectively drive-connected to the first cam of each cam group; wherein, when the two rollers are in a second roller position of the two roller positions, the two rollers are respectively drive-connected to the second cam of each cam group; wherein the slotted guide is coupled to the cam shaft in a rotationally fixed manner between the two cam groups; wherein the two rollers are arranged on the roller bolt in an axially movable manner and the switching pin is arranged between the two rollers in an axially coupled manner such that the switching pin and the two rollers are configured to move as a unit with respect to an axial direction of the roller bolt; wherein when the switching pin is in the switching position, the switching pin is moved along the axial direction of the roller bolt such that the two rollers are adjusted into one of the two roller positions; wherein an axial spacing between the two cam groups is defined by the slotted guide; and wherein the slotted guide includes an X-shaped guide groove.

19. The valve control according to claim 18, wherein: the switching pin is further coupled to a moving bolt, the moving bolt mounted to the tilt lever in an axially movable manner and extending parallel to the roller bolt; when the switching pin is in the switching position, the switching pin is configured to axially adjust the moving bolt into a first bolt position and into a second bolt position with respect to the tilt lever; and the first bolt position and the second bolt position correspond to the first roller position and the second roller position, respectively.

20. A valve control for an internal combustion engine, comprising: a tilt lever shaft and a tilt lever rotatably mounted on the tilt lever shaft; a cam shaft extending parallel to the tilt lever shaft; two cam groups arranged on the cam shaft axially spaced apart from each other, the two cam groups each including a first cam and an axially adjacent second cam; a roller bolt fixed to the tilt lever and extending parallel to the cam shaft, the roller bolt including two rotatable rollers disposed axially spaced apart from each other; and an adjusting assembly including a switching pin extending perpendicularly through the roller bolt, the switching pin configured to be radially adjusted into a switching position and into a home position with respect to the roller bolt; wherein the switching pin engages a slotted guide disposed on the cam shaft when in the switching position and the switching pin is disengaged from the slotted guide when in the home position; wherein, when the switching pin is in the switching position, the two rollers are configured to be axially adjusted between two roller positions via the adjusting assembly; wherein, when the two rollers are in a first roller position of the two roller positions, the two rollers are respectively drive-connected to the first cam of each cam group; wherein, when the two rollers are in a second roller position of the two roller positions, the two rollers are respectively drive-connected to the second cam of each cam group; wherein the slotted guide is coupled to the cam shaft in a rotationally fixed manner between the two cam groups; wherein the two rollers are arranged on the roller bolt in an axially movable manner and the switching pin is arranged between the two rollers in an axially coupled manner such that the switching pin and the two rollers are configured to move as a unit with respect to an axial direction of the roller bolt; wherein, when the switching pin is in the switching position, the switching pin is moved along the axial direction of the roller bolt such that the two rollers are adjusted into one of the two roller positions; wherein the switching pin engages the slotted guide via an elongated hole disposed in the roller bolt; and wherein the slotted guide includes an X-shaped guide groove.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In each case schematically,

(2) FIG. 1 shows a view of a valve control according to the invention in a first embodiment;

(3) FIGS. 2 and 3 show further views of the valve control according to the invention in the first embodiment;

(4) FIGS. 4 and 5 show detail views of the valve control according to the invention in the first embodiment;

(5) FIG. 6 shows a detail view of the valve control according to the invention in a second embodiment;

(6) FIG. 7 shows a detail view of the valve control according to the invention in a third embodiment;

(7) FIG. 8 shows a sectional view through a roller bolt in the valve control in the third embodiment;

(8) FIG. 9 shows a further sectional view through a roller bolt in the valve control in the third embodiment;

DETAILED DESCRIPTION

(9) 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.

(10) 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.

(11) 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.

(12) 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.

(13) 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.

(14) 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.

(15) 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.

(16) 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.

(17) 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.

(18) 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.

(19) 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.