EP4196667A1 - Schiebenockensystem - Google Patents
SchiebenockensystemInfo
- Publication number
- EP4196667A1 EP4196667A1 EP21759285.6A EP21759285A EP4196667A1 EP 4196667 A1 EP4196667 A1 EP 4196667A1 EP 21759285 A EP21759285 A EP 21759285A EP 4196667 A1 EP4196667 A1 EP 4196667A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sliding cam
- cam element
- cam
- switching
- shifting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0005—Deactivating valves
- F01L2013/001—Deactivating cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L2013/0078—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by axially displacing the camshaft
Definitions
- the invention relates to a sliding cam system for an internal combustion engine according to the preamble of claim 1.
- a sliding cam system of the type mentioned above is known, for example, from DE 10 2011 054 218 A1.
- a rotatably mounted camshaft is provided in the known sliding cam system.
- the camshaft includes multiple slide cams.
- the sliding cams can be moved axially. The axial movement of the sliding cams is initiated by an actuator.
- a coupling rod is firmly connected via a shift fork to a sliding cam, which is moved axially directly by the actuator. With an axial movement of the slide cam, the coupling rod moves with the slide cam.
- the coupling rod includes scenes.
- the scenes are firmly connected to the coupling rod.
- the scenes are each assigned to a further sliding cam.
- the further sliding cams have pins which interact with the respectively assigned links in such a way that the further sliding cams are displaced in accordance with the movement of the sliding cam which is firmly connected to the coupling rod.
- a sliding cam system for an internal combustion engine with at least one camshaft comprising a support shaft with at least two sliding cam elements.
- the sliding cam elements each comprise a shift gate with at least one shift groove, the sliding cam elements being displaceable axially with respect to the carrier shaft by at least one actuator pin.
- At least one adjustment element is arranged parallel to a longitudinal axis of the support shaft, the adjustment element being axially displaceable in the direction of the longitudinal axis of the support shaft.
- the shifting cam system is set up in such a way that a shifting process of a first secondary shifting cam element takes place at least partially simultaneously with the shifting process of a secondary shifting cam element, the shifting range can be increased and thus an axial shifting of a shifting cam element at an increased speed and/or an axial shifting of a Sliding cam element with greater mass can be achieved over a known sliding cam system
- the sliding cam system is set up in such a way that the switching process of a first secondary sliding cam element begins immediately after the switching process of the primary sliding cam element has ended and that the switching process of a second secondary sliding cam element begins after the beginning and before the end of the switching process of the first secondary sliding cam element.
- the shift cam system is set up in such a way that the beginning of the shifting process of a first secondary shifting cam element and the beginning of the shifting process of a second secondary shifting cam element take place simultaneously.
- the length of the displacement areas of all sliding cam elements is different, in particular that °NW 121a/S * °NW 121b/S * °NW 121c/S applies.
- the displacement ranges of the sliding cam elements are greater than 120°NW, in particular that °NW 121a/S > 120° or °NW 121b/S > 120° or °NW 121c/ S > 120°.
- the beginning of the switching section °NW121b/SA at the beginning of the cam °NW122b/NA is not the same as the beginning of the switching section NW121C/SA at the beginning of the cam °NW122c/NA, in other words that the angular position of the Shifting range for the respective cam tip is different for the secondary shifting cam elements, in particular that °NW121b/SA to °NW122b/NA is unequal °NW121c/SA to °NW122c/NA.
- the length of the shifting area of the first shifting groove on the primary shifting cam element is greater than the length of the shifting areas of the shifting grooves on the secondary shifting cam elements.
- the length of the shifting area of the shifting groove on at least one secondary shifting cam element is greater than the length of the shifting area on the primary shifting cam element and/or possibly further secondary shifting cam elements.
- more than two secondary sliding cam elements are coupled with a connecting element.
- the secondary sliding cam elements are not identical parts, in particular with regard to the displacement area and/or cam contour.
- the cam contours of the secondary sliding cam elements are arranged identically, in particular are arranged angularly offset only according to the firing sequence, e.g. offset by 120° and are identical with regard to the cam contour.
- both the arrangement and the cam profile shape / cam profile length can differ.
- Primary sliding cam element is completed before the shifting of a
- Secondary sliding cam element takes place.
- displacement of the primary sliding cam member occurs only while the locking disc is released and displacement of the secondary cam members can preferably only occur when the locking disc is locked.
- the sliding cam system is set up in such a way that the switching process of a first secondary sliding cam element begins immediately after the switching process of the primary sliding cam element has ended, with the switching process of a further (second) secondary sliding cam element preferably starting after the beginning and before the end of the Switching process of the first secondary sliding cam element begins.
- FIG. 1 is a perspective view of one embodiment of a prior art cam shift system
- FIG. 2 is another perspective view of an embodiment of a prior art shift cam system
- Fig. 3 is a side view of an embodiment of a prior art shift cam system
- Fig. 5 is a side view of another embodiment of a prior art shift cam system
- FIG. 7 shows a perspective view of an embodiment of a sliding cam system according to the invention.
- FIG. 7a shows a perspective view of a camshaft of an embodiment of a sliding cam system according to the invention
- FIG. 8 shows a primary slide cam element of a slide cam system according to the invention in a perspective view
- FIG. 9 shows a primary slide cam element of a slide cam system according to the invention in a side view
- Fig. 10 shows a section A-A according to Fig. 9;
- 11 shows a perspective view of a first secondary shifting cam element of a shifting cam system according to the invention
- 12 shows a side view of a first secondary shifting cam element of a shifting cam system according to the invention
- Fig. 13 is a section C-C of Fig. 12;
- Fig. 13a shows a section C-C according to Fig. 12;
- FIG. 14 shows a second secondary shifting cam element of a shifting cam system according to the invention in a perspective view
- Fig. 16 shows a section B-B according to Fig. 15;
- Fig. 16a shows a section B-B according to Fig. 15;
- FIG. 17 shows a locking element (locking disk) for a sliding cam system according to the invention
- FIG. 18 shows a diagram “lift [mm]/blocking range [ ] over the angle [°NW]” for a sliding cam system according to the invention according to FIG. 7.
- Figures 1 to 4 show the same embodiment of a sliding cam system from different perspectives.
- the shift cam system for an internal combustion engine having at least one camshaft 10 comprises a support shaft 11. On the support shaft 11 are a primary shift cam element 12a and a first Secondary sliding cam element 12b is arranged to be axially movable relative to a longitudinal axis of the support shaft 11 and, in particular, to be rotated. It is conceivable that more than two sliding cam elements are arranged on the support shaft 11 .
- the carrier shaft 11 preferably comprises three roller bearings 20. One roller bearing 20 is arranged at the axial ends of the carrier shaft 11 and another roller bearing 20 is arranged between the sliding cam elements 12a, 12b.
- the roller bearings 20 are preferably locked by retaining rings 21. The number of roller bearings 20 and retaining rings 21 and the positions of the bearing points are variable.
- the sliding cam elements 12a, 12b include a shift gate 13 and a cam contour 22.
- the shifting gate 13 of the first sliding cam element 12a comprises a first and a second shifting groove 14a, 14b.
- the switching grooves 14a, 14b are at least partially V-shaped. In other words, the width of the two switching grooves 14a, 14b is not constant. The width is the distance between the flanks of the switching grooves 14a, 14b in the axial direction to the carrier shaft 11 to understand. The flanks of the switching grooves 14a, 14b approach one another in the V-shaped section.
- the two switching grooves 14a, 14b are preferably arranged at the same angle of rotation.
- the first switching groove 14a preferably has a larger radius than the second switching groove 14b.
- the radius is to be understood as the amount of the distance between the groove base of the first or the second shifting groove 14a, 14b and the central longitudinal axis of the carrier shaft 11.
- the outer diameter of the shift gate 13 and the radius of the groove base determine the depth of the groove.
- the first switching groove 14a preferably includes a step.
- the first switching groove 14a is designed as a projection or a shoulder.
- the first switching groove 14a preferably has a varying radius. That is, the first switching groove 14a has sections with a larger radius and a smaller radius. The radius is changed steplessly.
- the areas are each assigned to an entry area, an exit area or a shifting area.
- the second switching groove 14b preferably has a constant radius.
- the width of the second switching groove 14b is smaller than the width of the first switching groove 14a.
- Two actuator pins 15 are arranged on the carrier shaft 11 .
- the actuator pins 15 can essentially only be moved in one direction orthogonal to the central longitudinal axis of the carrier shaft 11 .
- the actuator pins 15 are assigned to the first switching groove 14a. Ie the actuator pins only work together with the first switching groove 14a.
- the actuator pins 15 are spaced apart from one another in the axial direction of the support shaft 11 . As a result, depending on the position of the primary sliding cam element, one of the two actuator pins 15 can be inserted into the first switching groove 14a. By inserting the actuator pins 15, an axial movement of the primary sliding cam element 14a can be initiated. For this purpose, an actuator pin 15 is inserted into the first switching groove 14a.
- the introduced actuator pin 15 interacts with a flank of the first switching groove 14a. More precisely, the introduced actuator pin 15 acts on a flank of the first switching groove 14a with a force directed against the flank. This results in the axial displacement of the primary sliding cam element 12a. The direction of the shift thus depends on the flank with which the introduced actuator pin
- An actuator pin 15 is assigned to each flank of the first switching groove 14a.
- An adjustment element 16 is arranged parallel to the carrier shaft 11 .
- the adjusting element 16 can be moved axially.
- the adjusting element is offset by 90° to the actuator pins 15. Alternatively, other angular offsets are conceivable.
- the adjusting element 16 comprises a first and a second coupling pin 17a, 17b and a receiving element 18.
- the first and the second coupling pin 17a, 17b are each arranged on an axial end of the adjusting element 16.
- the receiving element 18 comprises three extensions and is arranged between the axial ends of the adjustment element 16 .
- the coupling pins 17a, 17b and the receiving element 18 extend orthogonally to the central longitudinal axis of the carrier shaft 11.
- the first coupling pin 17a is assigned to the second switching groove 14b of the primary sliding cam element 12a.
- the first and the second coupling pin 17a, 17b are arranged on the adjustment element 16 in a substantially rotatable manner.
- the first coupling pin 17a is permanently engaged with the second switching groove 14b of the primary slide cam element 12a.
- the first coupling pin 17a is subjected to a force by a flank of the second switching groove 14b.
- the adjustment element 16 is displaced in the effective direction of the force. Since the adjustment element
- the coupling pins 17a, 17b are offset from one another by 90° in the circumferential direction and the first and the second switching groove 14a, 14b are arranged at the same angle of rotation, the displacement of the adjustment element 16 takes place correspondingly with a time offset or phase shift.
- the second coupling pin 17b is arranged in the area of the first secondary sliding cam element 12b.
- the first secondary sliding cam element 12b includes a switching groove 14.
- the switching groove 14 has a V-shaped section.
- the second coupling pin 17b is permanently engaged with the switching groove 14.
- the switching groove 14 of the first secondary sliding cam element 12b is arranged in such a way that a time-delayed switching of the first secondary sliding cam element 12b with respect to the primary sliding cam element 12a can be implemented.
- the second coupling pin 17b is moved axially in the switching groove 14. More precisely, the second coupling pin 17b is moved to one of the flanks of the switching groove 14. The second coupling pin 17b interacts with the switching groove 14 in essentially the same way as the actuator pins 15 interact with the first switching groove 14a of the primary sliding cam element 12a.
- the carrier shaft 11 comprises a locking element 19 in the form of a circular disk.
- the locking member 19 is interposed between the first and first secondary slide cam members 12a, 12b.
- the locking element 19 is axially delimited by the receiving element 18 .
- the locking element 19 has a supporting function.
- the locking element 19 forms an abutment for the receiving element 18.
- the locking element 19 absorbs the forces during the shifting process and thus enables the adjustment element 16 to be fixed. Furthermore, the interaction of the receiving element 18 and the locking element 19 prevents the primary sliding cam element 12a from being displaced unintentionally .
- the receiving element 18 includes two receptacles for the locking element 19.
- the locking element 19 includes a recess.
- the recess is arranged in the area of the corresponding angle of rotation.
- the recess is arranged in the circular disc in such a way that the adjustment element 16 is moved through the recess when there is an axial movement. It is conceivable that the adjustment element 16 additionally includes a spring-ball detent (not shown).
- the shifting cam system described above enables the shifting cam elements 12a, 12b to be shifted out of phase by the adjusting element 16 using a single actuator. As a result, the total number of actuators in the sliding cam system can be significantly reduced.
- FIG. 5 describes another embodiment of a prior art slide cam system.
- the shifting cam system essentially corresponds to the shifting cam system according to FIGS. 1 to 4.
- the shifting cam system shown comprises a second secondary shifting cam element 12c and in particular the primary shifting cam element 12a has a different shifting gate.
- the locking element 19 is preferably arranged between the second and the third sliding cam element 12b, 12c.
- the locking element 19 comprises a circular disc with a recess.
- An extension is arranged on the adjusting element 16 in the area of the circular disk.
- the circular disc forms an abutment for the extension.
- the circular disk interacts with the extension during a displacement process in such a way that the first coupling pin is relieved during the displacement process. In other words, the extension is supported against the circular disc.
- the recess is arranged on the angle of rotation at which the displacement of the first adjustment element 16 takes place.
- An actuator is marked with the reference number 23 .
- FIG. 6 shows “a diagram “stroke [mm]/locking range [ ] over the angle [°NW]” for a sliding cam system according to FIG. 5”.
- valve lifts resulting from the respective cam contours (large lift) of the embodiment of a sliding cam system according to the prior art according to FIG. 5 are shown as “VH profile cyl. 1", “VH profile cyl. 2” and “VH profile cyl. 3" drawn.
- valve lifts resulting from the respective cam contours (small lift) of the embodiment of a sliding cam system according to the prior art according to FIG. 5 are shown as “TH profile cyl. 1", “TH profile cyl. 2” and “TH profile cyl. 3” drawn.
- the blocking areas of the blocking disk or locking element 19 are also plotted in the diagram according to FIG. 6 .
- FIG. 7-18 A preferred embodiment of the present invention is illustrated in Figures 7-18.
- the embodiment of the sliding cam system according to the invention described there has a primary sliding cam element 12a, a first secondary sliding cam element 12b and a second secondary sliding cam element 12c.
- the locking element 19 can also be addressed as a locking disk.
- the adjustment element 16 can also be addressed as a push rod.
- the shifting cam elements each have a shifting groove 121a, 121a', 121b, 121c, i.e. the primary shifting cam element 12a the shifting groove 121a and 121a', the first secondary shifting cam element 12b the shifting groove 121b and the second secondary shifting cam element 12c the shifting groove 121c.
- the switching groove 121a is provided for engaging the actuator pins 15, whereas the switching groove 121a' is provided for engaging the first switching pin 17a of the connecting element 16.
- the switching groove 121b is provided correspondingly for the engagement of the second switching pin 17b and the switching groove 121c is provided correspondingly for the engagement of the third switching pin 17c.
- the operating principle is as outlined above, the primary sliding cam element 12a is axially displaced in a targeted manner via the actuator or the engagement of the actuator pins 15 in the switching groove 121a during the rotation of the camshaft 10 .
- the adjusting element 16 is axially displaced by the engagement of the first switching pin 17a in the switching groove 121a', as a result of which the switching pins 17b and 17c are also correspondingly displaced.
- the switching groove 121a of the primary sliding cam element 12a has at least one displacement area 121a/S and one freewheeling area 121a/F in the circumferential direction.
- the displacement area 121a/S is characterized in particular by a switching groove side cheek that is inclined relative to the longitudinal axis/rotational axis L of the primary sliding cam element 12a or carrier shaft. In other words, this is the area with which the primary element 12a and, through the operative connection between the switching groove 121a' and the switching pin 17a, the connecting element 16 are axially displaced.
- the freewheeling area is that area of the switching groove 121a in which no axial displacement of the connecting element 16 takes place.
- the shifting area can also be addressed as a switching area.
- the switching groove 121b of the first secondary sliding cam element 12b has at least one displacement area 121b/S and one freewheeling area 121b/F in the circumferential direction.
- the displacement area 121b/S is characterized in particular by a switching groove side cheek that is inclined relative to the longitudinal axis/rotational axis L of the secondary displacement cam element 12b or carrier shaft. In other words, this is the area on which a shifted switching pin 17b rests and axially shifts the secondary shifting cam element 12b in the desired direction.
- the freewheeling area is that area of the switching groove 121b in which no axial displacement of the secondary sliding cam element 12b takes place. This area is characterized in particular by the fact that there is no contact with the switching groove side wall during the movement of the connecting element.
- the second secondary sliding cam element 12c or its switching groove 121c also has a sliding area 121c/S and a freewheeling area 121c/F.
- the switching pin 17c of the adjustment element 16 engages here accordingly.
- the sliding cam elements each have at least two cam contours.
- a cam contour can also be designed as a so-called zero-lift cam.
- the cam contours differ from one another and lead in particular to different strokes of the activated valve (not shown).
- the primary sliding cam element 12a preferably has a first cam contour 122a and a second cam contour 122a'.
- the first secondary slide cam element 12b preferably has a first cam contour 122b and a second cam contour 122b'.
- the second secondary slide cam element 12c preferably has a first cam contour 122c and a second cam contour 122c'.
- No cam contour of the primary sliding cam element 12a is shown in FIGS. 7 and 7a merely for the sake of better illustration. However, reference can be made to FIGS. 8 to 10 here.
- the displacement ranges can be determined in more detail with regard to their angular length and also with regard to their start and end.
- the sliding cam system is set up in such a way that a switching process of the first secondary sliding cam element 12b takes place at least partially simultaneously with the switching process of the second secondary sliding cam element 12c.
- the partially simultaneous switching of the secondary sliding cam elements is understood as follows: the displacement areas of the respective secondary sliding cams are angularly aligned with one another in such a way that they have sections in which the coupling pin of the adjustment element for axial displacement of the first secondary sliding cam element and the coupling pin of the adjustment element for axial displacement of the second secondary sliding cam element at the same time (concurrently) are in operative contact, so that an axial displacement of the second secondary cam element begins at least while the axial displacement of the first secondary sliding cam element takes place.
- the angular orientation, i. H. the arrangement and length of the respective corresponding displacement areas of the secondary links are always dependent on the design of the motor or the respective installation space requirements of the internal combustion engine, such as the radial arrangement and position of the adjustment element.
- the angular orientation, i. H. the arrangement and length of the respective corresponding displacement areas of the secondary links are always dependent on the design of the motor or the respective installation space requirements of the internal combustion engine, such as the radial arrangement and position of the adjustment element.
- the shifting cam system is set up in such a way that the shifting process of the first secondary shifting cam element 12b begins immediately after the end of the shifting process of the primary shifting cam element 12a and that the switching process of the second secondary shifting cam element 12c begins after the beginning and before the end of the shifting process of the first secondary sliding cam element 12b. More preferably, it can be provided that the shifting cam system is set up in such a way that the beginning of the shifting process of the first secondary shifting cam element 12b and the beginning of the shifting process of the second secondary shifting cam element 12c take place simultaneously.
- the radial length of the displacement ranges °NW121a/S, °NW121b/S and °NW121c/S (angle ranges) of all sliding cam elements 12a, 12b, 12c is different, in particular that °NW121a/S * °NW121b applies /S * °NW121c/S.
- the displacement ranges of the sliding cam elements are greater than 120°NW, in particular that °NW121a/S>120° or °NW121b/S>120° or °NW121c/S>120°.
- the sliding cam system is set up such that the offset of the switching section °NW121b/SA to the start of the cam °NW122b/NA is unequal to the offset of the switching section °NW121c/SA to the start of the cam °NW122c/NA.
- the length of the displacement range °NW121a/S of the first shifting groove 121a on the primary sliding cam element 12a is greater than the length of the displacement ranges °NW121b/S or °NW121c/S of the shifting grooves 121b or 121c on the secondary shifting cam element 12b or .12c.
- the length of the displacement range °NW121b/S or °NW121c/S of the switching groove 121b or 121c on at least one secondary sliding cam element 12b or 12c is greater than the length of the displacement range °NW121a/S on the primary sliding cam element 12a and /or, if necessary, further secondary sliding cam elements (°NW121x/S or 12x).
- the x stands here as an index for further secondary sliding cam elements.
- more than two secondary sliding cam elements 12b, 12c are coupled with a connecting element 16, in particular for applications in internal combustion engines with more than 3 cylinders in a row arrangement. Provision can preferably be made for the switching groove on a secondary sliding element to be larger than on the primary sliding element and/or larger than on at least one further secondary sliding element.
- the sliding cam system is also applicable to 5, 6, 8, 10, 12 cylinder internal combustion engines.
- the sliding cam system can also be designed in three stages (or more) based on the number of cam contours 122x y . "X" is the index for the respective sliding cam element, "Y” is the index for the respective cam contour.
- the present invention changes the length and the arrangement of the shifting grooves (area of axial shifting) of the secondary shifting gates in relation to the respective cam tip in such a way that ultimately an overlapping shifting of the secondary elements is achieved.
- secondary sliding cam elements are not identical parts, in particular with regard to the displacement area (arrangement, length) and/or cam contour (arrangement, length).
- the arrangement of the displacement areas for the respective cam tip should be different, the length can be different. If the secondary cams have different mass properties, the shifting behavior can be adjusted, for example, by matching the length of the shifting grooves to the mass.
- the beginning of the switching section °NW121b/SA to the cam tip NS122b of the first secondary shifting cam is 143° and the beginning of the switching section NW121C/SA to the cam tip NS122c of the second secondary shifting cam is 203°, with others Words that the angular position of the displacement range for the respective cam tip secondary slide cam elements is different, specifically that °NW121b/SA to NS122b is unequal °NW121c/SA to NS122c.
- the arrangement and the cam profile shape / cam profile length can differ.
- the switching process or the axial displacement of a first secondary sliding cam element 12b begins immediately after the switching process of the primary sliding cam element has ended.
- the switching process of a further (second) secondary sliding cam element preferably begins after the start and before the end of the switching process of the first secondary sliding cam element.
- the first secondary shifting cam element and the further secondary shifting cam element or elements shift simultaneously - i.e. the beginning of the shifting processes takes place at the same time.
- valve lifts resulting from the first cam contours 122a, 122b and 122c are shown as “VH profile cyl. 1", “VH profile cyl. 2” and “VH profile cyl. 3" drawn.
- valve lifts resulting from the first cam contours 122a', 122b' and 122c' are shown as “TH profile cyl. 1", “TH profile cyl. 2” and “TH profile cyl. 3" drawn.
- the blocking areas of the blocking disk or locking element 19 are also plotted in the diagram according to FIG. 18 .
- valve lifts resulting from the first cam contours 122a, 122b and 122c are defined as “VH profile cyl. 1", “VH profile cyl. 2” and “VH profile cyl. 3” or valve lifts resulting from the first cam contours 122a′, 122b′ and 122c′ as “TH profile cyl. 1", “TH profile cyl. 2” and “TH profile cyl. 3" overlap in time.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020210259.7A DE102020210259A1 (de) | 2020-08-12 | 2020-08-12 | Schiebenockensystem |
| PCT/EP2021/072306 WO2022034104A1 (de) | 2020-08-12 | 2021-08-10 | Schiebenockensystem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4196667A1 true EP4196667A1 (de) | 2023-06-21 |
| EP4196667B1 EP4196667B1 (de) | 2025-07-23 |
Family
ID=77499820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21759285.6A Active EP4196667B1 (de) | 2020-08-12 | 2021-08-10 | Schiebenockensystem |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12031460B2 (de) |
| EP (1) | EP4196667B1 (de) |
| CN (1) | CN116034212B (de) |
| DE (1) | DE102020210259A1 (de) |
| WO (1) | WO2022034104A1 (de) |
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-
2020
- 2020-08-12 DE DE102020210259.7A patent/DE102020210259A1/de active Pending
-
2021
- 2021-08-10 US US18/020,781 patent/US12031460B2/en active Active
- 2021-08-10 CN CN202180055937.7A patent/CN116034212B/zh active Active
- 2021-08-10 WO PCT/EP2021/072306 patent/WO2022034104A1/de not_active Ceased
- 2021-08-10 EP EP21759285.6A patent/EP4196667B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020210259A1 (de) | 2022-02-17 |
| WO2022034104A1 (de) | 2022-02-17 |
| CN116034212A (zh) | 2023-04-28 |
| US20240035398A1 (en) | 2024-02-01 |
| US12031460B2 (en) | 2024-07-09 |
| EP4196667B1 (de) | 2025-07-23 |
| CN116034212B (zh) | 2026-02-03 |
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