CN112154274A - Camshaft and method for producing a camshaft - Google Patents
Camshaft and method for producing a camshaft Download PDFInfo
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- CN112154274A CN112154274A CN201980032349.4A CN201980032349A CN112154274A CN 112154274 A CN112154274 A CN 112154274A CN 201980032349 A CN201980032349 A CN 201980032349A CN 112154274 A CN112154274 A CN 112154274A
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- Prior art keywords
- intermediate element
- flat
- camshaft
- recess
- shaft
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
- F16D1/108—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
- F16D1/116—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling the interengaging parts including a continuous or interrupted circumferential groove in the surface of one of the coupling parts
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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
- F01L13/0015—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
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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
- F01L2301/00—Using particular materials
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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
- F01L2303/00—Manufacturing of components used in valve arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
- F16D2001/102—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via polygon shaped connections
Abstract
The invention relates to a camshaft, comprising a shaft (1) having a longitudinal axis (L) and at least one sliding cam assembly (2), wherein the sliding cam assembly (2) is arranged on the shaft (1) in a rotationally fixed but axially displaceable manner, wherein a rotation-preventing device (3) is arranged between the shaft (1) and the sliding cam assembly (2), wherein the rotation-preventing device (3) has a recess (33) facing the shaft (1) in the sliding cam assembly (2), a flat portion (31) facing the sliding cam assembly in the shaft (1), and an intermediate element (32) arranged between the flat portion (31) and the recess (33), wherein the flat portion (31) has a flat surface (311) facing the intermediate element (32), and the intermediate element (32) has a flat first surface (321) facing the flat portion (31), wherein the recess (33) has a flat bottom surface (331) facing the intermediate element (32), and the intermediate element (32) has a flat second surface (322) facing the recess (33), wherein the face (311), the first surface (321), the second surface (322) and the base surface (331) are arranged plane-parallel to one another, and to a method for producing a camshaft according to the invention.
Description
Technical Field
The invention relates to a camshaft according to the preamble of claim 1 and to a method for producing a camshaft according to the preamble of claim 14.
Background
The camshaft comprises in particular a shaft and at least one sliding cam assembly. The sliding cam assembly is axially movable but is received on the camshaft in a rotationally fixed manner. To this end, an arrangement for a torque transmitting connection is provided.
The camshaft with the sliding cam arrangement serves to vary the valve lift of the internal combustion engine, and depending on the axial position of the sliding cam arrangement on the main shaft, the contact elements for valve control can interact with different cam profiles formed adjacent to one another on the sliding cam arrangement. Here, the lift information is stored in a specific cam profile and may include, for example, different sized valve lifts or so-called zero lift for cylinder deactivation. For the axial adjustment of the sliding cam arrangement, it comprises, in addition to the cam profile, an adjustment element in which an adjustment part is engaged, which is arranged in a fixed manner in a receiving body for receiving the camshaft.
Such a camshaft is known, for example, from DE 102014111383 a 1.
As a means of torque transmission connection, an elongate needle bearing element is proposed in DE 102014111383 a1, the first part of which circular cross section is located in a longitudinal groove in the sliding cam assembly channel, while the second part of the same cross section is located in a longitudinal groove outside the main shaft.
Although the aforementioned solutions have many positive aspects, care must be taken for the large number of necessary tolerances, which makes the manufacturing process expensive and complex and therefore costly.
Another sliding cam system is known from DE 102013218908 a 1. A sliding cam is described which is mounted rotatably and axially displaceably on a spindle, and the torque transmission between the spindle and the sliding cam takes place via a transverse pin arranged in the sliding cam and aligned essentially tangentially, which transverse pin is connected to a carrier plane on the spindle. It is expected that an uneven distribution of stresses will occur in the system, since the contact surfaces of the transverse pins taper towards the main axis. This may result in impaired axial displaceability.
Disclosure of Invention
The invention has been developed in this way, and the object thereof is to provide an improved camshaft, in particular a camshaft, which has low tolerances during the production process and ensures easy axial displacement of the sliding cam arrangement.
According to the invention, this object is achieved by a camshaft having the features of the characterizing portion of claim 1. By making
The flat portion has a flat face facing the intermediate element and the intermediate element has a flat first surface facing the flat portion, wherein
The recess has a flat bottom surface facing the intermediate element and the intermediate element has a flat second surface facing the recess, wherein
A face, a first surface, a second surface and a bottom surface are arranged plane-parallel to each other,
the disadvantages outlined above may be overcome or at least reduced. Due to the uniform planar and plane-parallel surfaces, a uniform surface pressure can be expected. In the ideal case, no line pressure or point pressure occurs. In this way, an advantageous condition that good axial displacement performance can be ensured is obtained. Furthermore, the means for preventing rotation are very simple in terms of production technology. The flat faces in the shaft and the sliding cam assembly can be produced in a simple manner, for example by surface grinding, milling or pressing. The intermediate element, ideally a simple rectangular cuboid, is also easy to manufacture in terms of production technology.
Further advantageous embodiments of the invention are provided, in particular, by the features of the dependent claims. The bodies or features of the individual claims can in principle be combined with one another as desired.
In an advantageous embodiment of the invention, it can be provided that the sliding cam arrangement is designed as a hollow cylinder and has an inner wall facing the shaft, wherein the recess is arranged in the inner wall.
In a further advantageous embodiment of the invention, it can be provided that the recess is designed as a groove having a first side and a second side, wherein the sides are in particular parallel to the longitudinal axis and in particular perpendicular or slightly inclined to the base of the recess.
In a further advantageous embodiment of the invention, it can be provided that the flat has a first end face and a second end face, wherein the end faces are in particular transverse and perpendicular or oblique to the faces of the flat in the radial direction. The end face provides in particular an axial fixing of the inserted intermediate element. Depending on the manufacturing process, the end faces are oriented perpendicular to the longitudinal axis, for example by pressing to incline them, or by machining.
In a further advantageous embodiment of the invention, it can be provided that the flat merges circumferentially into the outer contour of the shaft and/or that the outer contour of the shaft merges circumferentially into the flat, in particular that the flat has no side faces. Since it is assumed that the torque is transmitted only or at least mainly via the flat surfaces, the flat portions are preferably not designed as grooves or elongated holes.
In a further advantageous embodiment of the invention, provision can be made for the secant line of the circular axis to be located on the surface of the flat part with its longitudinal axis as center point and/or for the tangent or the outer line of the circular axis to be located in the base of the recess with its longitudinal axis L as center point. The aforementioned geometrical relationship ultimately describes in more detail the orientation of the surface of the flat with the bottom surface of the recess. By means of such a construction of the camshaft, it is advantageously possible to connect the cam module to the shaft, since the surface of the flat is preferably always in the shaft, i.e. below the outer contour of the other part, and the bottom surface of the recess is preferably always outside the shaft, i.e. above the outer contour of the other part of the shaft.
In a further advantageous embodiment of the invention, it can be provided that the intermediate element is designed as a plate-like object having a first surface, a second surface, a first end face and a second end face and a first lateral face and a second lateral face. The further-mentioned faces can also be designed to be flat. The respective opposing surfaces may also be plane-parallel. A rectangular shape and thus a cuboid which is easy to manufacture is preferably obtained as the intermediate element. The transition between the faces, i.e. the edges of the intermediate element, may be provided with a radius or chamfer. This transition is also easy to handle in terms of production technology.
In a further advantageous embodiment of the invention, it can be provided that, in the loaded state of the camshaft, a surface of the flat bears against the first surface of the intermediate element and/or a second surface of the intermediate element bears against a bottom surface of the recess. "theoretically", the surfaces do not abut under no load, since a certain gap between the parts is advantageous for moving the cam. Of course, in practice, these elements are in contact with each other to be in a static definite state. The characteristic contact of the components occurs only when torque is applied.
In a further advantageous embodiment of the invention, it can be provided that the side of the intermediate element is opposite the side of the recess and/or that the end face of the intermediate element is opposite the end face of the flat portion. In principle, no forces are transmitted between the aforementioned side faces or end faces. The only possible contact is to prevent the intermediate element from slipping.
In a further advantageous embodiment of the invention, it can be provided that the surface of the flat, the first surface of the intermediate element, the second surface of the intermediate element and the bottom surface of the recess have a common vertical line which extends at right angles to the longitudinal axis. Preferably, therefore, the aforementioned faces are not only aligned plane-parallel, but also have a common vertical line, which in turn is perpendicular to the longitudinal axis.
In a further advantageous embodiment of the invention, it can be provided that the width of the intermediate element is greater than the thickness of the intermediate element and/or that the intermediate element has a minimum thickness which corresponds to the maximum depth of the flat from the outer diameter of the shaft at the flat to the surface of the flat. In other words, the intermediate element always overlaps the circumferential profile of the shaft at the flat.
In a further advantageous embodiment of the invention, it can be provided that the intermediate element is formed in sections, in particular that the second surface has a recess in the second surface transversely to the longitudinal direction of the intermediate element. This measure makes the manufacture of the camshaft easier, so that the intermediate element can be pushed into the gap between the flat portion and the sliding cam assembly, in particular into the recess of the sliding cam assembly.
In a further advantageous embodiment of the invention, it can be provided that the camshaft according to the invention is equipped with two or more devices for preventing rotation in the axial position of the shaft. A symmetrical arrangement of two flat sections and two intermediate elements for force transmission is advantageous, which in particular facilitates the rotational performance, and preferably the manufacturing process can be designed simply, in particular if the flat sections are manufactured by moulding.
Another object of the invention is to propose an advantageous manufacturing method for a camshaft according to the invention.
According to the invention, this object is achieved by a method having the features of the characterizing portion of claim 14.
Further advantageous embodiments of the invention are provided, in particular, by the features of the dependent claims. The bodies or features of the individual claims can in principle be combined with one another as desired.
Drawings
Further features and advantages of the invention will become apparent from the following description of preferred exemplary embodiments with reference to the attached drawings. In the figure:
fig. 1 shows a camshaft with a partially cut-out device for preventing rotation according to the invention in a perspective view;
fig. 1a shows a camshaft according to the invention according to fig. 1 in a perspective sectional view along the longitudinal axis;
FIG. 2 shows a portion of a camshaft according to the present invention in a cross-sectional view along the longitudinal axis;
FIG. 3 shows a camshaft according to the invention in a cross-sectional view;
FIG. 4 shows a portion of a shaft of a camshaft according to the present invention in a perspective view;
FIG. 5 shows a cross-sectional view of an axle having two flats (biplane) or four flats (four planes) at the same axial position;
fig. 6 shows an intermediate element in a perspective view;
FIG. 7 shows a segmented intermediate element in perspective view;
FIG. 8 shows a sliding cam assembly in cross-section;
FIG. 9 shows a schematic cross-section of a shaft with an intermediate element to show the width versus depth;
FIG. 10 shows the resulting force F for an assumed torque MRA schematic diagram of (a);
FIG. 11 shows a schematic representation of an axial cross-section to show secant, outer line and tangent lines.
Detailed Description
Reference is first made to fig. 1.
The camshaft according to the invention essentially comprises a shaft 1 and at least one sliding cam assembly 2. The sliding cam assembly 2 is arranged on the shaft 1 in a rotationally fixed but axially movable manner. Between the shaft 1 and the sliding cam arrangement 2, a means 3 for preventing rotation is arranged, wherein the means 3 for preventing rotation has a recess 33 in the sliding cam arrangement 2 facing the shaft 1, a flat 31 in the shaft 1 facing the sliding cam arrangement and an intermediate element 32 arranged between the flat 31 and the recess 33.
The shaft 1 is preferably designed as a hollow shaft with a circular cross section. The shaft 1 has a longitudinal axis L or axis of rotation. The shaft 1 can be equipped with other accessories and functions, such as fixed cams, needle bearings, bearing rings, sensor wheels and heads.
The sliding cam assembly 2 preferably comprises a first cam profile 21 and at least one second cam profile 22. The sliding cam assembly 2 is designed in the shape of a hollow cylinder and has an inner wall 23 facing the shaft 1. A recess 33 is arranged in the inner wall 23. The sliding cam assembly 2 can be equipped with additional accessories and features, such as removable latching devices 4, which removably secure the sliding cam assembly in at least two axial positions on the shaft 1.
According to the invention, the flat part 31 has a flat surface 311 facing the intermediate element 32, and the intermediate element 32 has a flat first surface 321 facing the flat part 31, the recess 33 has a flat bottom surface 331 facing the intermediate element 32, and the intermediate element 32 has a flat second surface 322 facing the recess 33, wherein the flat surface 311, the first surface 321, the second surface 322 and the bottom surface 331 are arranged in plane-parallel relationship with one another.
The flat portion 31 has the above-described flat surface 311, and preferably has a first end surface 312 and a second end surface 313. The end faces 312 and 313 are preferably aligned transverse to the longitudinal axis L. The end faces 312 and 313 may be designed to be perpendicular or slightly inclined with respect to the flat face 311 of the flat portion 31. The slightly inclined design is essentially due to the manufacturing process, for example, by pressing a flat into the shaft, it is difficult to achieve a completely perpendicular design of the end faces. However, if a flat portion is milled, a perpendicular end face can be achieved completely.
The recess 33 is preferably designed as a groove and has a bottom surface 331, a first side surface 332 and a second side surface 333. The side surfaces 332 and 333 are preferably aligned parallel to the longitudinal axis L. The side surfaces 332 and 333 are preferably aligned perpendicular to the bottom surface 331. However, depending on the manufacturing process, a slightly inclined orientation is also conceivable here. The groove is only a conceivable alternative to the design of the recess 33. The side surfaces 332 and 333 are preferably also designed to be flat.
The intermediate element 32 is preferably designed as a plate-like object, in particular in the form of a cuboid. The intermediate element 32 comprises the first 321 and second 322 surfaces described above, but also preferably comprises a first 323 and second 324 end surface, and a first 325 and second 326 side surface. The surfaces 323 to 326 are also preferably planar. Furthermore, the respective opposing faces are preferably oriented plane-parallel. The edges of the intermediate element may be chamfered and/or have a smaller radius. The intermediate element can also be designed to be somewhat spherical.
Further details of the proposed invention arise in particular from the above-mentioned relationships between the individual elements and the surfaces.
In the loaded state of the camshaft, i.e. when transmitting torque between the shaft and the cam assembly, the face 311 of the flat 31 preferably abuts against the first surface 321 of the intermediate element 32 and/or the second surface 322 of the intermediate element 32 abuts against the bottom surface 331 of the recess 33. In the unloaded state there is substantially no contact between the above-mentioned surfaces, or an oil film is provided between the above-mentioned surfaces, which further promotes the axial movability of the cam member 2.
It is furthermore advantageously provided that the side 325 or 326 of the intermediate element 32 is situated opposite the respective side 332 or 333 of the recess 33 and/or that the end 323 or 324 of the intermediate element 32 is situated opposite the respective end 312 or 313 of the flat portion 31. Ideally, the aforementioned faces do not contact each other under load. Which only serves as a protective measure against slipping of the intermediate element 32.
It is also preferably provided that the flat portion 31 has the end faces 312 and 313 already described above, but no side faces. The flat 31 preferably merges directly into the outer contour of the shaft 1 in the circumferential direction and/or seamlessly into the flat in the circumferential direction.
It is also preferably provided that the surface 311 of the flat 31, the first surface 321 of the intermediate element, the second surface 322 of the intermediate element 32 and the bottom 331 of the recess 33 have a common vertical line S which runs at right angles to the longitudinal axis L.
Furthermore, it is preferably provided that the secant line E of the circular shaft 1 is located on the face 311 of the flat 31, with its longitudinal axis L as a center point, and/or that the outer line P or the tangent line G of the circular shaft is located in the bottom 331 of the recess 33, with its longitudinal axis L as a center point.
It can also be provided that the camshaft according to the invention is equipped with two means 3 and 3' for preventing rotation at the axial position of the shaft 1. It is conceivable that the camshaft is equipped with further means 3, 3', 3 ", 3'", for preventing rotation at an axial position of the shaft 1.
On the basis of the shaft 1, for the variant with two means 3 and 3 'at axial positions of the shaft 1, there are respectively two flats 31 and 31', which in turn form a biplane on the shaft 1. The remaining circular cylindrical surface profile of the shaft 1 abuts between the flat portions without any transition. In principle, it is also possible to consider further devices 3 at the same axial position, so that the shape of a plurality of flat portions with the same dimensions is obtained by the number of flat portions 31, preferably an even number.
It is also conceivable to provide a combination of sliding cam assemblies 2 and means 3 for preventing rotation at more than one axial position of the shaft 1. In the figures, such modifications are indicated by the reference numerals a, b, etc., in particular 3a, 3b, etc.
It can also be provided that the second surface 322 of the intermediate element is segmented, i.e. that a notch 327 transverse to the longitudinal direction of the intermediate element is provided in the second surface 322. This may result in manufacturing advantages of the camshaft according to the invention, which will be discussed further below.
Further details of the invention emerge in particular from the schematic illustration of the production of the camshaft according to the invention.
The flat portion 3 or 3' may be produced by forming, cutting and/or preliminary forming processes. PECM-precision electrochemical metal machining may also be used.
The flat 3 or 3' is preferably pressed into the shaft 1. In particular, pressing is characterized by high production speeds. The flat portion is produced by a cutting process, for example milling, characterized in that the end face can be milled perpendicularly. The recess on the inner side of the sliding cam assembly 2 is preferably produced by a machining process. In principle, however, other suitable production methods are also conceivable here.
The intermediate element rests on a flat on the circumference of the shaft.
The sliding cam assembly 2, and in particular its recess 33, is then pushed onto the intermediate element. In principle, the sliding cam arrangement 2 is now movable, but is accommodated in a non-rotatable manner on the shaft 1. For example, other components such as the latch 4 may ensure that the sliding cam assembly is axially releasably retained between two discrete positions. In the case of a plurality of devices 3, 3', etc. for preventing rotation at a common axial position, the insertion process of the above-mentioned intermediate elements is performed in parallel or sequentially.
Especially with a plurality of devices 3, 3', etc. at a common axial position, the segmented intermediate element 32 may help in that it is arranged such that the sliding cam assembly 2 initially pushes only partially, preferably to about half the extent, onto the flat portion 31, 31', etc. at one axial position, so that a gap is created between the flat portion 31 and the sliding cam assembly 2, especially between the recesses 33 of the sliding cam assembly 2. The segmented intermediate element 32 can then be inserted between the flat 31 and the recess 33, since the segmented intermediate element 32 can be bent and can thus be inserted through the gap formed. The sliding cam assembly 2 can then be moved fully to its final position. The assembly method is used in particular for assembling a camshaft in a cylinder head cover with an undivided sliding bearing. In this application it may happen that the entire intermediate element 32 is in fact too long to fit into the existing assembly space.
Alternatively, it is also possible to provide for the production of short intermediate elements 32, which are then inserted one after the other into the long flat 31 on the shaft 1. In particular, it can be provided that the thickness D of the intermediate element can be varied.
The dimensions of the flat, the recess and the intermediate element are substantially dependent on the torque to be transmitted.
Preferably, however, there is a relationship between the width B and the thickness D of the intermediate element 32. The width B of the intermediate element 32 extends transversely to the longitudinal axis a of the intermediate element 32, parallel to the surfaces 321, 322. The thickness D of the intermediate element 32 extends perpendicular to the longitudinal axis a of the intermediate element 32, parallel to the side faces 325,326 or the end faces 323, 324. In other words, the thickness D of the intermediate element 32 extends in a radial direction with respect to the longitudinal axis L of the shaft 1, and the width B extends in a direction tangential to the circumference of the shaft 1.
It is advantageously provided here that the width B of the intermediate element 32 is greater than the thickness D of the intermediate element 32. In fig. 9, having different widths B is shown in dashed lines and schematically1And B2And a thickness D1And D2Two alternative intermediate elements of (a). It is also preferably provided that the intermediate element has a minimum thickness DminThe minimum thickness corresponding to the maximum depth T of the shaft 1 from the shaft outer diameter at the flat portion 31 to the face 311 of the flat portion 31max. In other words, the intermediate element 32 is at least as thick as the depth of the flat portion 31. In other words, the intermediate element always overlaps the circumferential profile of the shaft at the flat. This property can also be seen in fig. 9.
In addition, the respective resulting effective areas for torque transmission are shown in fig. 9, in particular by the width B1Effective area W generated1And by the width B2Effective area W generated2. In each case it can be assumed that the introduced torque acts on the active area, so that a uniform surface loading is achieved.
The resulting force F for the assumed torque M is again schematically shown in fig. 10R。
Fig. 11 schematically shows the positions of secant line E, outer line P and tangent line G.
The features and details described in connection with the method are of course also applicable to the device according to the invention and vice versa, so that the disclosure with respect to the various aspects of the invention can be mutually cited. In addition, the method according to the invention can be performed with the device according to the invention.
A planar surface is understood to mean a planar and/or non-curved surface, which can be produced, for example, by means of planar grinding. Planarity or parallelism is understood to mean a property or orientation on a technical or industrial scale.
Description of the reference numerals
Longitudinal axis of the L-axis
A axis of symmetry or longitudinal axis of the intermediate element
B width of intermediate element
D thickness of intermediate element
Depth of T flat part
S vertical line
E secant line
P outer line
G tangent line
M torque
1 axle
2 sliding cam assembly
3 means for preventing rotation
4 latch device
21 first cam profile
22 second cam profile
23 inner wall
31 flat part
32 intermediate element
33 recess
311 side
312 first end face
313 second end face
321 first surface
322 second surface
323 first end face
324 second end face
325 first side
326 second side
327 notch
331 bottom surface
332 first side surface
333 second side surface
Claims (15)
1. Camshaft comprising a shaft (1) with a longitudinal axis (L) and at least one sliding cam assembly (2), wherein the sliding cam assembly (2) is arranged on the shaft (1) in a rotationally fixed but axially displaceable manner, wherein a means (3) for preventing rotation is arranged between the shaft (1) and the sliding cam assembly (2), wherein the means (3) for preventing rotation has a recess (33) in the sliding cam assembly (2) facing the shaft (1), a flat (31) in the shaft (1) facing the sliding cam assembly, and an intermediate element (32) arranged between the flat (31) and the recess (33), characterized in that,
-the flat portion (31) has a flat face (311) facing the intermediate element (32), and the intermediate element (32) has a flat first surface (321) facing the flat portion (31), wherein
-the recess (33) has a flat bottom surface (331) facing the intermediate element (32), and the intermediate element (32) has a flat second surface (322) facing the recess (33), wherein
-said face (311), first surface (321), second surface (322) and bottom face (331) are arranged plane-parallel to each other.
2. A camshaft according to claim 1, characterized in that the sliding cam assembly (2) is configured as a hollow cylinder and has an inner wall (23) facing the shaft (1), wherein the recess (33) is arranged in the inner wall (23).
3. A camshaft as claimed in any one of the preceding claims, characterized in that the recess (33) is designed as a groove having a first side face (332) and a second side face (333), wherein these first and second side faces (332,333) are in particular parallel to the longitudinal axis (L) and in particular perpendicular or oblique to the base face (331) of the recess (33).
4. A camshaft as claimed in any one of the preceding claims, characterized in that the flat portion (31) has a first end face (312) and a second end face (313), wherein the first and second end faces (312,313) are in particular transverse and perpendicular or oblique to the face (311) of the flat portion (31) in the radial direction.
5. A camshaft as claimed in any one of the preceding claims, characterized in that the flat (31) merges circumferentially seamlessly into the outer contour of the shaft (1) and/or the outer contour of the shaft merges circumferentially seamlessly into the flat, in particular the flat (31) has no flanks.
6. A camshaft as claimed in any one of the preceding claims, characterized in that the intermediate element (32) is constructed as a plate-like object having a first surface (321), a second surface (322), a first end surface (323) and a second end surface (324) and a first side surface (325) and a second side surface (326).
7. A camshaft as claimed in any one of the preceding claims, characterized in that in the loaded state of the camshaft the face (311) of the flat (31) bears against the first surface (321) of the intermediate element (32) and/or the second surface (322) of the intermediate element (32) bears against the bottom surface (331) of the recess (33).
8. A camshaft as claimed in any one of the preceding claims, characterized in that the side faces (325,326) of the intermediate element (32) are opposite the side faces (332,333) of the recess (33) and/or the end faces (323,324) of the intermediate element (32) are opposite the end faces (312,313) of the flat (31).
9. A camshaft as claimed in any one of the preceding claims, characterized in that the face (311) of the flat (31), the first surface (321) of the intermediate element (32), the second surface (322) of the intermediate element (32) and the bottom surface (331) of the recess (33) have a common vertical line (S) which extends at right angles to the longitudinal axis (L).
10. A camshaft as claimed in any one of the preceding claims, characterized in that the secant (E) of the round shaft (1) lies on the face (31) of the flat (31) with the longitudinal axis (L) as the centre point and/or the outer line (P) or the tangent (G) of the round shaft (1) lies in the bottom face (331) of the recess (33) with the longitudinal axis (L) as the centre point.
11. A camshaft as claimed in any one of the preceding claims, characterized in that the width (B) of the intermediate element (32) is greater than the thickness (D) of the intermediate element (32) and/or the intermediate element (32) has a minimum thickness (D)min) Said minimum thickness corresponding toThe flat portion (31) has a maximum depth (T) from the outer diameter of the shaft at the flat portion (31) to the surface (311) of the flat portion (31)max)。
12. A camshaft as claimed in any one of the preceding claims, characterized in that the intermediate element (32) is constructed in sections, in particular the surface, preferably the second surface (322), having an indentation (327) transverse to the longitudinal direction (a) of the intermediate element.
13. A camshaft as claimed in any one of the preceding claims, characterized in that the camshaft according to the invention is equipped with two or more devices (3, 3') for preventing rotation in the axial position of the shaft (1).
14. Method for manufacturing a camshaft according to any one of the preceding claims, in particular a camshaft with two means (3 or 3') for preventing rotation in an axial position, characterized in that the method has at least the following method steps:
a) at least one flat portion (31 or 31') is produced by a forming, cutting and/or primary forming process, in particular by pressing,
b) in particular, a recess (33 or 33') is produced on the inner side of the sliding cam component (2) by means of a cutting process,
c) placing an intermediate element (32 or 32') on at least one flat portion (31 or 31'),
d) the sliding cam component (2), in particular the recess (33 or 33') thereof, is pushed onto the intermediate element (32 or 32') or the flat (31 or 31 ').
15. The method of claim 14,
-the sliding cam assembly (2) is partly pushed in before the intermediate element (32 or 32') is placed on at least one flat portion (31 or 31') so that there is a gap between the flat portion and the sliding cam assembly (2), in particular the recess (33 or 33') of the sliding cam assembly,
-placing the intermediate element (32 or 32') on at least one flat portion (31 or 31') by inserting the segmented intermediate element (32 or 32') through the gap,
-pushing the sliding cam assembly (2), in particular its notch (33 or 33') onto the intermediate element (32 or 32') or the flat (33 or 33') by full pushing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018207438.0A DE102018207438A1 (en) | 2018-05-14 | 2018-05-14 | Camshaft, and method for producing a camshaft |
| DE102018207438.0 | 2018-05-14 | ||
| PCT/EP2019/062028 WO2019219525A1 (en) | 2018-05-14 | 2019-05-10 | Camshaft, and method for the production of a camshaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112154274A true CN112154274A (en) | 2020-12-29 |
| CN112154274B CN112154274B (en) | 2023-01-10 |
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ID=66530045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980032349.4A Active CN112154274B (en) | 2018-05-14 | 2019-05-10 | Camshaft and method for producing a camshaft |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112154274B (en) |
| DE (1) | DE102018207438A1 (en) |
| WO (1) | WO2019219525A1 (en) |
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| JPS5244314A (en) * | 1975-10-06 | 1977-04-07 | Mitsubishi Motors Corp | Variable valve-timing device |
| GB2052015A (en) * | 1979-06-20 | 1981-01-21 | Uni Cardan Ag | Universal joints |
| DE10054623A1 (en) * | 2000-11-03 | 2002-05-08 | Audi Ag | Device for changeover of cam pack on camshaft to operate gas exchange valves has actuating element in form of pin movable radially outwards and in extended state interacting with slide tracks in guide section |
| FR2829814A1 (en) * | 2001-09-14 | 2003-03-21 | Valeo Equip Electr Moteur | Planetary gear for motor vehicle starter, has outer sleeve fixed to end plate and inner crown with shock absorbing inserts between |
| GB0801241D0 (en) * | 2008-01-24 | 2008-02-27 | Mechadyne Plc | Single cam phaser camshaft |
| WO2008061382A1 (en) * | 2006-11-20 | 2008-05-29 | Thyssenkrupp Presta Teccenter Ag | Cam shaft assembly |
| DE102014111383A1 (en) * | 2014-08-11 | 2016-02-11 | Thyssenkrupp Presta Teccenter Ag | Camshaft with sliding cam package |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4236655A1 (en) * | 1992-10-30 | 1994-05-05 | Porsche Ag | Valve drive for an internal combustion engine |
| DE10121798A1 (en) * | 2001-05-04 | 2002-11-07 | Audi Ag | Valve gear for internal combustion engine has valve operating element with rotatably mounted stepped roller with center section of larger diameter and edge sections on both sides with smaller diameter |
| DE102011000511A1 (en) * | 2011-02-04 | 2012-08-09 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Slide cam system has sliding block that is guided in longitudinal groove of drive shaft and received in longitudinal groove of cam assembly, where sliding block is arranged in width direction of cam assembly and latched with shaft |
| DE102013218908A1 (en) * | 2013-09-20 | 2015-03-26 | Schaeffler Technologies Gmbh & Co. Kg | Sliding sock system with cross pin |
-
2018
- 2018-05-14 DE DE102018207438.0A patent/DE102018207438A1/en active Pending
-
2019
- 2019-05-10 CN CN201980032349.4A patent/CN112154274B/en active Active
- 2019-05-10 WO PCT/EP2019/062028 patent/WO2019219525A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5244314A (en) * | 1975-10-06 | 1977-04-07 | Mitsubishi Motors Corp | Variable valve-timing device |
| GB2052015A (en) * | 1979-06-20 | 1981-01-21 | Uni Cardan Ag | Universal joints |
| DE10054623A1 (en) * | 2000-11-03 | 2002-05-08 | Audi Ag | Device for changeover of cam pack on camshaft to operate gas exchange valves has actuating element in form of pin movable radially outwards and in extended state interacting with slide tracks in guide section |
| FR2829814A1 (en) * | 2001-09-14 | 2003-03-21 | Valeo Equip Electr Moteur | Planetary gear for motor vehicle starter, has outer sleeve fixed to end plate and inner crown with shock absorbing inserts between |
| WO2008061382A1 (en) * | 2006-11-20 | 2008-05-29 | Thyssenkrupp Presta Teccenter Ag | Cam shaft assembly |
| GB0801241D0 (en) * | 2008-01-24 | 2008-02-27 | Mechadyne Plc | Single cam phaser camshaft |
| EP2242911A1 (en) * | 2008-01-24 | 2010-10-27 | Mechadyne PLC | Single cam phaser camshaft |
| DE102014111383A1 (en) * | 2014-08-11 | 2016-02-11 | Thyssenkrupp Presta Teccenter Ag | Camshaft with sliding cam package |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112154274B (en) | 2023-01-10 |
| WO2019219525A1 (en) | 2019-11-21 |
| DE102018207438A1 (en) | 2019-11-14 |
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