Abstract
A method concerns producing a cam profile of a cam pack with at least two cam elements that can be adjusted relative to each other. The camshaft may comprise an outer shaft, a rotatable inner shaft, a fixed cam element connected to the outer shaft, and an adjustment cam element connected to the inner shaft. The method may comprise processing an adjustment cam contour by a continuous diameter reduction of a segment of the adjustment cam base circle, wherein the adjustment cam base circle is reduced to a diameter that is smaller than a fixed cam nominal circle diameter minus a doubled adjustment cam base circle tolerance. The method may comprise processing a fixed cam contour by reducing a fixed cam contour protrusion in a region between a transition point and a processing point. Upon reaching the transition point a tapping element for converting a revolving motion of the cam elements into a linear motion of the valves is transferred from the fixed cam element to the adjustment cam element.
Claims
1.-10. (canceled)
11. A method for producing a cam profile of a cam pack of a camshaft, wherein the cam pack includes at least two cam elements that are adjustable relative to each other, wherein the camshaft comprises an inner shaft disposed concentrically within an outer shaft such that the inner shaft is rotatable, wherein the at least two cam elements include a fixed cam element connected to the outer shaft for conjoint rotation and an adjustment cam element connected to the inner shaft for conjoint rotation, the method comprising: processing an adjustment cam contour of the adjustment cam element by way of a continuous diameter reduction of a segment of an adjustment cam base circle, wherein the adjustment cam base circle is reduced to a diameter smaller than a fixed cam nominal circle diameter minus a doubled adjustment cam base circle tolerance; and processing a fixed cam contour of the fixed cam element by reducing a fixed cam contour protrusion in a region between a transition point and a processing point, wherein upon reaching the transition point a tapping element for converting a revolving motion of the at least two cam elements into a linear motion of valve pistons is transferred from the fixed cam element to the adjustment cam element.
12. The method of claim 11 wherein the processing of the adjustment cam contour is performed by way of a grinding process.
13. The method of claim 11 wherein the processing of the fixed cam contour is performed by way of a grinding process.
14. The method of claim 11 wherein at the transition point the fixed cam contour is configured as a constant cam elevation.
15. The method of claim 11 wherein the adjustment cam contour in the adjustment cam base circle is reduced at least in sections by about 0.02 mm per about 5° cam angle.
16. The method of claim 11 further comprising producing a recess at least in sections in the adjustment cam base circle, wherein the recess is reduced relative to a fixed cam base circle at least by about a doubled profile tolerance of the adjustment cam base circle.
17. A camshaft comprising: an outer shaft; an inner shaft disposed concentrically within the outer shaft; and a cam pack having a fixed cam element connected to the outer shaft for conjoint rotation and an adjustment cam element mounted rotatably relative to the outer shaft and connected to the inner shaft for conjoint rotation, wherein the adjustment cam element and the fixed cam element form a common cam profile and are rotatable relative to each other about a common central axis, wherein the common cam profile interacts with a tapping element for converting a revolving motion of the cam pack into a linear motion of valve pistons, wherein the common cam profile comprises: an adjustment cam contour of the adjustment cam element with an adjustment cam base circle diameter reduced at least in sections, wherein the adjustment cam base circle diameter is smaller than a fixed cam nominal circle diameter minus a doubled adjustment cam base circle tolerance, and a fixed cam contour of the fixed cam element with a fixed cam contour protrusion reduced at least in sections in at least a region between a first of at least two transition points and a processing point, wherein upon reaching the first of the at least two transition points the tapping element is transferable from the fixed cam element to the adjustment cam element.
18. The camshaft of claim 17 wherein the fixed cam contour has a constantly extending cam elevation at least one of the at least two transition points.
19. The camshaft of claim 18 wherein the constantly extending cam elevation is disposed in a region of the first of the at least two transition points where the tapping element is transferable from the fixed cam contour to the adjustment cam contour.
20. The camshaft of claim 17 wherein the adjustment cam contour comprises a constantly reduced adjustment cam base circle that is reduced at least in sections by about 0.02 mm per about 5° cam angle.
21. The camshaft of claim 17 wherein the common cam profile of the cam pack is produced by processing an adjustment cam contour of the adjustment cam element by way of a continuous diameter reduction of a segment of an adjustment cam base circle, wherein the adjustment cam base circle is reduced to a diameter smaller than a fixed cam nominal circle diameter minus a doubled adjustment cam base circle tolerance; and processing a fixed cam contour of the fixed cam element by reducing a fixed cam contour protrusion in a region between a transition point and a processing point, wherein upon reaching the transition point a tapping element for converting a revolving motion of the at least two cam elements into a linear motion of valve pistons is transferred from the fixed cam element to the adjustment cam element.
Description
[0028] Embodiments of the cam pack of a camshaft according to the invention—in particular, of the fixed cam element and the adjustment cam element—and embodiments of basically-known cam packs—in particular, their fixed cam elements and their adjustment cam elements—are explained in more detail below with reference to the drawings. They respectively show schematically:
[0029] FIG. 1 a lateral view of an embodiment of a basically-known cam pack in a 0° spread,
[0030] FIG. 2 a lateral view of the embodiment, shown in FIG. 1, of a basically-known cam pack in a maximum spread,
[0031] FIG. 3 a lateral view of the embodiment, shown in FIGS. 1 and 2, of a basically-known cam pack in a grinding position,
[0032] FIG. 4 a lateral view of an embodiment of a fixed cam element of a camshaft according to the invention,
[0033] FIG. 5 a lateral view of an embodiment of an adjustment cam element of a camshaft according to the invention,
[0034] FIG. 6 a lateral view of a basically-known fixed cam element in comparison to an embodiment of a fixed cam element with changed fixed cam contour according to the present invention,
[0035] FIG. 7 a lateral view of a basically-known adjustment cam element in comparison to an embodiment of an adjustment cam element with changed adjustment cam contour according to the present invention,
[0036] FIG. 8 a lateral view of an embodiment of a cam pack of a camshaft according to the invention with a 0° spread between a fixed cam element produced at the upper tolerance limit and an adjustment cam element produced at the lower tolerance limit,
[0037] FIG. 9 a lateral view of the embodiment, shown in FIG. 8, of a cam pack of a camshaft according to the invention with a maximum spread between a fixed cam element produced at the upper tolerance limit and an adjustment cam element produced at the lower tolerance limit,
[0038] FIG. 10 a lateral view of an embodiment of a cam pack with a 0° spread between a fixed cam element produced at the lower tolerance limit and an adjustment cam element produced at the upper tolerance limit,
[0039] FIG. 11 a lateral view of the embodiment, shown in FIG. 10, of a cam pack with a maximum spread between a fixed cam element produced at the lower tolerance limit and an adjustment cam element produced at the upper tolerance limit,
[0040] FIG. 12 a perspectival view of an embodiment of a camshaft according to the invention with a cam pack at 0° spread, and
[0041] FIG. 13 a perspectival view of the embodiment, shown in FIG. 12, of a camshaft according to the invention with a cam pack at maximum spread.
[0042] Elements with the same function and mode of operation are respectively provided with the same reference symbols in FIGS. 1 through 13.
[0043] FIGS. 1 through 3 respectively show a lateral view of an embodiment of a basically-known cam pack 11. The cam pack 11 comprises at least one fixed cam element 20 with a basically-known fixed cam contour 20a and one adjustment cam element 30 with a basically-known adjustment cam contour 30a. In FIG. 1, the cam pack 11 is in a 0° spread position, while, in FIG. 2, this cam pack 11 is in a maximum spread position. This means that the adjustment cam element 30 is spread apart or turned in relation to the fixed cam element 20, wherein, therefore, taking into consideration the requirements and load conditions of the combustion engine of a motor vehicle, such angular positions between the adjustment cam element 30 and the fixed cam element 20 can, advantageously, be taken steplessly. Within the scope of the invention, “stepless” is understood to mean that any angular position between the aforementioned spread positions can be taken. The cam profile of the cam pack 11 is composed of several segments and is, consequently, advantageously formed by means of the fixed cam contour 20a and the adjustment cam contour 30a. The contact between the individual cam elements 20 or 30 of the cam pack 11 and a tapping element, which is not shown here and which, for example, is designed in the shape of a cam follower, advantageously switches between the fixed cam element 20 and the adjustment cam element 30 with each rotation of the camshaft and, consequently, of the cam pack 11—in particular, of the individual cam elements 20, 30—about a central axis of rotation A in the direction of rotation D.
[0044] As can be seen in FIGS. 1 and 2, the transition point P1, which is, advantageously, a calculated and therefore a theoretical transition point, where the tapping element (not shown here) is transferred from the fixed cam element 20 to the adjustment cam element 30, is theoretically most often located in a transition region of the fixed cam element 20. Within the scope of the invention, the transition region of the fixed cam element 20 defines a region of the contour of the fixed cam element 20, in which a recess 21 starts in the region of the fixed cam elevation, wherein the recess 21 extends along a segment of the fixed cam contour—advantageously, up to the second transition point P2. In particular, in the transition region, an abrupt decrease of the fixed cam contour 20a is formed, in order to produce the recess 21. The cam elements 20 and 30 shown in FIGS. 1 through 3 are processed or ground jointly in a known manner, wherein, to this end, the camshaft itself is in a mounted condition provided for this purpose. During the grinding process for producing the cam contour 20a or 30a of the individual cam elements 20 or 30, the inner shaft (not shown here) bends as a result of the load of the grinding wheel (not shown here), which load acts upon the cam elements 20 or 30—in particular, upon the adjustment cam element 30. As a result, an undesired displacement of the adjustment cam element 30 occurs, whereby, in turn, disadvantageous profile jumps in the cam profile—in particular, in the regions of the transition points P1 or P2—are produced. At the transition point P2, the tapping element is advantageously transferred again from the adjustment cam element 30 to the fixed cam element 20. Such profile jumps result in undesired—in particular, impermissible—accelerations in the valve train and must therefore be avoided. In particular, the design of the recess 21 in the fixed cam element 20, which is required because of the common grinding process of the cam elements 20 or 30, is, advantageously, to be used so that a reliable transfer between the fixed cam element 20 and the adjustment cam element 30 takes place and positively determines such profile jumps.
[0045] FIG. 3 shows a lateral view of the embodiment, shown in FIGS. 1 and 2, of a basically-known cam pack 11 in a grinding position. In such a position of the cam pack 11, in which the adjustment cam element 30 is spread apart in relation to the fixed cam element 20 at a predefined angle, a processing of at least one of the cam contours 20a or 30a of the cam elements 20 or 30 is, advantageously, made possible.
[0046] FIG. 4 schematically shows a lateral view of an embodiment of a fixed cam element 2 of a camshaft (not shown here) according to the invention. The fixed cam element 2 comprises, when viewed in the circumferential direction, a fixed cam base circle G.sub.F and a fixed cam elevation N.sub.F. The fixed cam base circle G.sub.F extends in this case, advantageously, between an end or an end point of the fixed cam elevation N.sub.F and a beginning or a starting point of the fixed cam elevation B.sub.F, wherein, in the basically-known cam elements 20 or 30 shown in FIGS. 1 through 3, at least no first transition point P1 and/or second transition point P2 for transferring a tapping element (not shown here) from the fixed cam element 2 to an adjustment cam element 3, as shown schematically in the following FIG. 5, or from the adjustment cam element 3 to the fixed cam element 2, is formed in the entire segment of the fixed cam base circle G.sub.F. At least the first transition point P1 and/or at least the second transition point P2 is/are partially located in the segment of the fixed cam elevation N.sub.F, which is adjacent to the segment of the fixed cam base circle G.sub.F and completes the circumference of the fixed cam element 2.
[0047] With reference symbol 10 is illustrated a nominal cam contour for the entire cam pack 1 (cf., for example, FIGS. 8 through 11), with respect to which the design and shaping of the contours 2a, 3a of the individual cam elements 2 and 3 can be illustrated in FIGS. 4 and 5. Within the scope of the invention, the nominal cam contour is an idealized cam contour.
[0048] FIG. 4 also schematically shows a processing segment 6, by means of which the segment of the change in the fixed cam contour 2a is schematically specified in a region of the fixed cam element 2 between a first transition point P1 and a processing point X. The processing segment 6 extends, advantageously, starting from the first transition point P1 to the processing point X, which is formed either in the segment of the fixed cam elevation N.sub.F or, at least partially, in the segment of the fixed cam base circle G.sub.F—consequently, essentially between the segment of the fixed cam elevation N.sub.F and the segment of the fixed cam base circle G.sub.F. According to the method according to the invention, the fixed cam contour 2a is processed such that the region of the fixed cam elevation N.sub.F is expanded into the region of the fixed cam base circle G.sub.F, in comparison to the design of the cam contour of basically-known fixed cam elements (cf. FIGS. 1 through 3), whereby the length of the fixed cam base circle G.sub.F is consequently reduced.
[0049] As shown in FIG. 4, the first transition point P1 is formed between the region of the fixed cam element 2 in which the beginning of the fixed cam elevation B.sub.F is formed and the region in which the end of the fixed cam elevation E.sub.F is formed. Within the scope of the invention, the first transition point P1 is consequently the region or segment of the fixed cam elevation N.sub.F, or also of the adjustment cam elevation N.sub.V, as shown, for example, in FIG. 5, where the tapping element is transferred from the fixed cam contour 2a to the adjustment cam contour 3a and consequently from the fixed cam element 2 to the adjustment cam element 3.
[0050] As, for example, shown in FIG. 4, the second transition point P2 is formed in the region of the end of the fixed cam elevation E.sub.F and can, consequently, advantageously be formed directly on the border region between the segment of the fixed cam elevation N.sub.F and the segment of the fixed cam base circle G.sub.F, or directly on the segment of the fixed cam elevation N.sub.F, or directly on the segment of the fixed cam base circle G.sub.F.
[0051] The transition points P1 and P2 are not points or regions that can be directly assigned to a cam element 2 or 3, but, rather, are formed as a result of the interaction of the two cam elements 2 and 3. When viewing the adjustment cam element 3, the transition points P1 and P2 can consequently also be specified as reference points for the description of the positioning of the individual design features of the adjustment cam element 3.
[0052] The transition points P1 and P2 are, therefore, also shown in FIGS. 8 through 11.
[0053] FIG. 5 shows a lateral view of an embodiment of an adjustment cam element 3, which, comparably to the fixed cam element 2, also has a base circle, viz., the adjustment can base circle G.sub.V, and a cam elevation, viz., the adjustment cam elevation N.sub.V. With respect to the design and arrangement of the adjustment cam base circle G.sub.V and the adjustment cam elevation N.sub.V, reference is made to the explanations listed above regarding the fixed cam element 2, which explanations also apply to the adjustment cam element 3. The same also applies to the arrangement of the first transition point P1, as well as of the second transition point P2.
[0054] As shown in FIG. 5, the adjustment cam contour 3a is designed such that the radius of the adjustment cam base circle r.sub.V, and consequently also the respective diameter, is dimensioned to be smaller than the radius of the nominal base circle r.sub.N, and consequently also the respective diameter, of the nominal cam contour 10. Formed as a result is a recess F, by means of which it is made possible that the tapping element (not shown here) contact the fixed cam contour 2a in the fixed cam base circle region G.sub.F, as shown in FIG. 4, and not the adjustment cam contour 3a in the adjustment cam base circle G.sub.V, when the cam contour 2a is traversed in the region of the base circle of the cam pack 1.
[0055] The region of a cam elevation designed to be constant is denoted by reference symbol K in FIG. 5. This constant cam elevation K is, advantageously, formed at the adjustment cam contour 3a and is characterized by a segment in the region of the adjustment cam elevation N.sub.V, which has no—or only a negligibly small—positive and/or negative slope. Advantageously, the constant cam elevation K—in particular, the constant adjustment cam elevation K—is advantageously formed in the region of the first transition point P1 in the segment of the adjustment cam elevation N.sub.V and accordingly extends, advantageously, at least in sections between the point B.sub.V, which marks the beginning of the adjustment cam elevation N.sub.V, and the region of the first transition point P1. Particularly advantageously, the first transition point P1 is formed on the segment of the constant adjustment cam elevation, which segment extends in the circumferential direction of the adjustment cam element 3, so that, taking into consideration a desired adjustment angle between the adjustment cam element 3 and the fixed cam element 2, a coincidence of the fixed cam contour 2a and the adjustment cam contour 3a is ensured, in order to avoid profile jumps and allow for a trouble-free transition of the tapping element from the fixed cam element 2 to the adjustment cam element 3.
[0056] FIG. 6 shows a lateral view of a fixed cam element 20 known from the prior art in comparison to an embodiment of a fixed cam element 2 with the fixed cam contour 2a according to the present invention, which fixed cam contour is changed in comparison to the fixed cam contour 20a of the known fixed cam element 20. Advantageously, in the production of the new fixed cam contour 2a, a continuous transition region between the transition points (cf., for example, FIG. 4) is created by means of an advantageously constant reduction of the fixed cam contour protrusion or the fixed cam contour elevation in this named region. The processing of the fixed cam 2 takes place, in particular, taking into consideration the required edge conditions, such as the required valve velocities and accelerations, etc. The production of a recess, as the known fixed cam contour 20a (cf. FIG. 4) has, is advantageously avoided. Particularly advantageously, the entire fixed cam contour 2a of the fixed cam element 2 is produced—in particular, ground—circumferentially, after mounting of the fixed cam element 2 on the outer shaft of the camshaft (as shown, for example, in FIGS. 12 and 13).
[0057] Comparably to FIG. 6, FIG. 7 shows a lateral view of an adjustment cam element 30 known from the prior art in comparison to an embodiment of an adjustment cam element 3 with the adjustment cam contour 3a according to the present invention, which adjustment cam contour is changed in comparison to the known adjustment cam contour 30a. The processing or production of the adjustment cam contour 3a advantageously takes place prior to the mounting of the adjustment cam element 3 on the outer shaft of the camshaft (as shown, for example, in FIGS. 12 and 13). Advantageously, the adjustment cam elevation N.sub.V (cf. FIG. 5) of the adjustment cam element 3 is extended by a defined angular range, whereby the base circle diameter, in turn, is, essentially, continuously reduced. In the processing of the adjustment cam profile 3a, and consequently in the processing of the adjustment cam base circle G.sub.V or its tapering off, the required edge conditions, such as the valve velocity and the accelerations, etc., must be taken into consideration.
[0058] Based upon the changed cam contours 2a and 3a of the fixed cam element 2 and the adjustment cam element 3 respectively, jumps in the profile of the cam pack, which is composed of at least one fixed cam element 2 and one adjustment cam element 3, are, advantageously, avoided. Particularly advantageously, the fixed cam contour 2a and/or the adjustment cam contour 3a, and consequently the cam profile of the cam pack 1, are, advantageously, ground circumferentially, after the mounting of the cam on the shaft.
[0059] FIGS. 8 and 9 respectively show a lateral view of an embodiment of a cam pack 1, wherein the fixed cam element 2 is produced at the upper tolerance limit, and the adjustment cam element 3 is produced at the lower tolerance limit.
[0060] In the illustration shown in FIG. 8, a 0° spread between the adjustment cam element 3 and the fixed cam element 2 is shown, according to which the cam pack 1 is in a first extreme position. In contrast, in FIG. 9, a maximum spread between the adjustment cam element 3 and the fixed cam element 2 is shown, according to which the cam pack 1 is in a second extreme position. In this case, the superposition of the contours 2a and 3a of the individual cam elements 2 and 3 of the camshaft 100 according to the invention (cf. FIGS. 12 and 13) are consequently shown.
[0061] Independently of the desired adjustment angle of the camshaft (not shown here), and consequently of the spread of the cam pack 1, the design of the adjustment cam contour 3a and of the fixed cam contour 2a as described above results in an overlap in the regions of the transition points P1 and P2, such that jumps between the individual contours of the adjustment cam element 3 and the fixed cam element 2 are avoided in these regions, and an even cam profile with respect to the cam pack 1 consequently arises. Even a production of the cam elements 2 or 3 at the upper or lower tolerance limit does not have any negative influence upon the properties of the transition regions of the profile in the implementation of the method according to the invention. Thus, FIGS. 8 and 9 show that, based upon the use of the tolerance ranges in the production of the individual cam elements 2 or 3, the functional area of the adjustment cam element 3 is indeed reduced, because the actually used transition points P1.1 and P2.1 are respectively shifted in the direction of the other transition point P1 or P2 in comparison to the theoretical or calculated transition points P1 and P2. Nonetheless, a profile free of jumps is also obtained in this case. P1.1 is, consequently, the first actual transition point, where the tapping element is transferred from the fixed cam contour 2a to the adjustment cam contour 3a. Accordingly, the tapping element is transferred from the adjustment cam contour 3a to the fixed cam contour 2a at the second actual transition point P2.1.
[0062] Denoted by the reference symbol D is the direction of rotation of the entire cam pack 1, which is rotated about its axis of rotation A (cf. FIGS. 12 and 13), based upon the rotation of the entire camshaft (not shown here). The leading flank 40 of the cam pack 1 is therefore formed between the beginning of the respective cam elevation, viz., the adjustment cam elevation B.sub.V or the fixed cam elevation B.sub.F, and an elevation peak, where the cam elevation has a maximum. Adjacent thereto is the trailing flank 50, which consequently extends starting from the elevation peak in the direction of the end of the cam elevation, viz., the adjustment cam elevation E.sub.V or the fixed cam elevation E.sub.F. Such explanations also apply to the illustrations in FIGS. 10 and 11.
[0063] FIGS. 10 and 11 respectively show a lateral view of an embodiment of a cam pack 1, wherein the fixed cam element 2 is produced at the lower tolerance limit, and the adjustment cam element 3 is produced at the upper tolerance limit.
[0064] In the illustration shown in FIG. 10, a 0° spread between the adjustment cam element 3 and the fixed cam element 2 is shown, according to which the cam pack 1 is in a first extreme position. In contrast, in FIG. 11, a maximum spread between the adjustment cam element 3 and the fixed cam element 2 is shown, according to which the cam pack 1 is in a second extreme position. In this case, the superposition of the contours 2a, 3a of the individual cam elements 2, 3 of the camshaft 100 according to the invention (cf. FIGS. 12 and 13) is consequently shown.
[0065] Independently of the desired adjustment angle of the camshaft (not shown here), and consequently of the spread of the cam pack 1, the design of the adjustment cam contour 3a and of the fixed cam contour 2a as described above results in an overlap in the regions of the transition points P1 and P2, such that jumps between the individual contours of the adjustment cam element 3 and the fixed cam element 2 are avoided in these regions, and an even cam profile with respect to the cam pack 1 consequently arises. Even a production of the cam elements at the upper or lower tolerance limit does not have any negative influence upon the properties of the transition regions of the profile. Thus, FIGS. 10 and 11 show that, based upon the use of the tolerance ranges in the production of the individual cam elements 2 or 3, the functional area of the adjustment cam element 3 is indeed enlarged, because the actually used transition points P1.1 and P2.1 are respectively shifted in the direction of the base circle region, in comparison to the theoretical or calculated transition points P1 and P2. Nonetheless, a profile free of jumps is also obtained in this case. P1.1 is, consequently, the first actual transition point, where the tapping element is transferred from the fixed cam contour 2a to the adjustment cam contour 3a. Accordingly, the tapping element is transferred from the adjustment cam contour 3a to the fixed cam contour 2a at the second actual transition point P2.1.
[0066] FIGS. 12 and 13 respectively illustrate a perspectival view of an embodiment of a camshaft 100 according to the invention with a cam pack 1, wherein the cam pack 1 is at a 0° spread according to FIG. 12, while the cam pack 1 according to FIG. 13 is positioned in a maximum spread.
[0067] The cam pack 1 comprises an adjustment cam element 3 and two fixed cam elements 2.1 and 2.2, which are arranged adjacently to the adjustment cam element 3 and in a manner enframing it between them. The fixed cam elements 2.1 and 2.2, as well as the adjustment cam element 3, have a common axis of rotation A and are advantageously arranged coaxially to each other.
[0068] Based upon the spread of the cam pack 1, i.e., as a result of the angular position of the adjustment cam element 3 in relation to the fixed cam elements 2.1 and 2.2, a variability in the valve elevation, and thus in the opening period of the control valve, of a combustion engine is, advantageously, made possible. The advantageously stepless opening period of the cam profile, which consists of the adjustment cam contour 3a and the respective fixed cam contours 2.1a and 2.2a of the fixed cam elements 2.1 and 2.2, is caused in this case by the spread of the cam pack 1 by, for example, a relative rotation of the inner shaft 5 in relation to the outer shaft 4. A rotation—in particular, the realization of an adjustment angle between the fixed cam elements 2.1, 2.2 and the adjustment cam element 3—advantageously takes place as a result of the arrangement of the adjustment cam element 3 on the inner shaft 5 for conjoint rotation and the arrangement of the fixed cam elements 2.1, 2.2 on the outer shaft 4 for conjoint rotation.
[0069] The described embodiments do not presuppose completeness. It is, furthermore, conceivable that the features described in the figures also be used in combination with each other.
LIST OF REFERENCE SYMBOLS
[0070] 1 Cam pack [0071] 2 Fixed cam element [0072] 2a Fixed cam contour [0073] 2.1 First fixed cam element [0074] 2.1a Fixed cam contour of the first fixed cam element [0075] 2.2 Second fixed cam element [0076] 2.2a Fixed cam contour of the second fixed cam element [0077] 3 Adjustment cam element [0078] 3a Adjustment cam contour [0079] 4 Outer shaft [0080] 5 Inner shaft [0081] 6 Processing segment [0082] 10 Nominal cam contour [0083] 11 Cam pack (prior art) [0084] 20 Fixed cam element (prior art) [0085] 20a Fixed cam contour (prior art) [0086] 21 Recess of the fixed cam element [0087] 30 Adjustment cam element (prior art) [0088] 30a Adjustment cam contour (prior art) [0089] 40 Leading flank [0090] 50 Trailing flank [0091] 100 Camshaft [0092] A Axis of rotation [0093] B.sub.F Beginning of the fixed cam elevation [0094] B.sub.V Beginning of the adjustment cam elevation [0095] D Direction of rotation [0096] E.sub.F End of the fixed cam elevation [0097] E.sub.V End of the adjustment cam elevation [0098] F Recess [0099] G.sub.F Fixed cam base circle [0100] G.sub.V Adjustment cam base circle [0101] K Constant cam elevation [0102] N.sub.F Fixed cam elevation [0103] N.sub.V Adjustment cam elevation [0104] P1 First transition point (theoretical) [0105] P1.1 First actual transition point [0106] P2 Second transition point (theoretical) [0107] P2.1 Second actual transition point [0108] r.sub.F Radius of the fixed cam base circle [0109] r.sub.V Radius of the adjustment cam base circle [0110] X Processing point
