Cylinder head cover, and method for installing a cylinder head cover

Abstract

The present invention relates to a cylinder head cover comprising an axial bearing (4) for a camshaft (3) which is rotatably accommodated in the cylinder head cover, the camshaft (3) comprising at least one functional component (34, 35), the axial bearing (4) comprising at least one pin pair (41a, 41b and / or 42a, 42b), between which the functional component (34 or 35) is arranged, and to a method for installing a cylinder head cover according to at least one of the preceding claims, the method comprising the method steps: placing the camshaft (3) with the functional components (34, 35) in bearing half-shells (6) of the cylinder head cover main body (1); inserting the pins (41a, 41b and / or 42a, 42b) into the receiving openings (43a, 43b, 43c, 43d) in the cylinder head cover main body (1); placing the bearing frame (2) onto the cylinder head cover main body (1), the pins (41a, 41b and / or 42a, 42b) partially entering the receiving openings (44a, 44b, 44c, 44d) in the bearing frame (2).

Description

[0001] Cylinder head cover, and method for assembling a cylinder head cover

[0002] The invention relates to a cylinder head cover with an axial bearing for a camshaft rotatably received in the cylinder head cover according to the preamble of claim 1, and to a method for assembling a cylinder head cover according to the invention according to the preamble of claim 12.

[0003] An internal combustion engine with at least one camshaft, which has at least one stop element to form an axial bearing, is known, for example, from DE102007014544. This describes an internal combustion engine with at least one camshaft, which has at least one stop element to form an axial bearing, which cooperates with a bearing frame of the axial bearing for axial support, wherein the stop element is formed by a cam of the camshaft, thus by a functional component of the camshaft, and the bearing frame has a clearance for the cam shape of the cam. Furthermore, the use of at least one cam of a camshaft of an internal combustion engine as a stop element of an axial bearing of the camshaft is described.

[0004] Although a possibility for axial bearing of a camshaft is already shown here, there is still room for improvement, particularly with regard to simpler assembly and / or a more cost-effectively manufactured axial bearing or cylinder head cover.

[0005] According to the invention, this object is achieved by a cylinder head cover with the characterizing features of claim 1. Because the axial bearing comprises at least one pair of pins between which the functional component is arranged, a cost-effective axial bearing for a functional component of the camshaft and—depending on the connection of the functional component to the rest of the camshaft—a cost-effective axial bearing for the camshaft in the cylinder head cover can be proposed. Assembly is also relatively simple, since, for example, pins are standard components that can be easily handled and installed. Furthermore, the required pins can be manufactured relatively inexpensively as separate components.A further advantage with regard to expected wear lies in the fact that pins form linear contact with the functional component, which is significantly more defined than, for example, surface contact and also provides advantages with regard to wear. Further advantageous embodiments of the proposed invention emerge in particular from the features of the subclaims. The subject matter or features of the various claims can, in principle, be combined with one another as desired.

[0006] In an advantageous embodiment of the invention, the axial bearing can comprise an additional pair of pins, between which the functional component is arranged. The pin pairs are preferably arranged on different sides of the camshaft. Accordingly, the functional component can be axially supported evenly on both sides in the pin pairs.

[0007] In a further advantageous embodiment of the invention, the pin pairs can be arranged perpendicular to the camshaft's rotational axis. This allows, for example, a bearing frame, which is usually placed from above onto a cylinder head cover base body, to also be placed perpendicularly onto the pin pairs.

[0008] In a further advantageous embodiment of the invention, the pins of the pin pair or the pins of the pin pairs can be accommodated in sections in receiving openings. The pins can be easily inserted into such receiving openings, which can be, for example, bores.

[0009] In a further advantageous embodiment of the invention, at least one pin of the pin pair, preferably both pins of the pin pair, can be rotatably received in the receiving openings. This can further reduce friction and improve wear behavior, thus reducing wear.

[0010] In a further advantageous embodiment of the invention, it can be provided that the cylinder head cover comprises a cylinder head cover base body and a bearing frame, wherein connection openings for the pins are provided both in the cylinder head cover base body and in the bearing frame. Such a configuration enables assembly advantages. For example, the pins can be simply inserted into the connection openings of the cylinder head cover base body and then the bearing cover can be placed on top so that the pins are inserted into its connection openings. In a further advantageous embodiment of the invention, it can be provided that the cylinder head cover comprises a first cylinder head cover element and a second cylinder head cover element, wherein connection openings for the pins are provided both in the first cylinder head cover element and in the second cylinder head cover element.Such a design offers assembly advantages. For example, the pins can be simply inserted into the connection openings of the first cylinder head cover element, and then the second cylinder head cover element can be placed on top so that the pins are inserted into its connection openings.

[0011] In a further advantageous embodiment of the invention, it can be provided that the functional component is a locking disc, a sensor wheel, a cam, in particular a pump cam.

[0012] In a further advantageous embodiment of the invention, it can be provided that the camshaft is a sliding camshaft, comprising a base shaft and at least one sliding cam, wherein the sliding camshaft comprises in particular two sliding cams which are connected to one another by means of a coupling rod.

[0013] Further features and advantages of the present invention will become clear from the following description of preferred embodiments with reference to the accompanying drawings.

[0014] Fig. 1 shows a cylinder head cover according to the invention in a perspective view, in particular with a locking disc axially fixed by means of two pairs of pins as a functional component;

[0015] Fig. 2 shows a camshaft of a cylinder head cover according to the invention in a plan view, with a locking disc which is fixed in the axial direction by an axial bearing consisting of two pairs of pins;

[0016] Fig. 3 shows a perspective view of a camshaft of a cylinder head cover according to the invention, with a locking disc that is fixed in the axial direction by an axial bearing consisting of two pairs of pins; Fig. 4 shows a perspective view of a cylinder head cover according to the invention, in particular with a sensor wheel as a functional component that is axially fixed by means of two pairs of pins;

[0017] Fig. 5 shows a camshaft of a cylinder head cover according to the invention in a perspective view, with a sensor wheel which is fixed in the axial direction by an axial bearing consisting of two pairs of pins;

[0018] Fig. 6 shows a camshaft of a cylinder head cover according to the invention in a perspective view, with a sensor wheel and a locking disc, which are each fixed in the axial direction by an axial bearing consisting of two pairs of pins;

[0019] Fig. 6a shows a camshaft of a cylinder head cover according to the invention in a perspective view, which comprises a first cylinder head cover element and a second cylinder head cover element (here only the first cylinder head cover element is shown for illustrative purposes);

[0020] Fig. 6b shows a camshaft of a cylinder head cover according to the invention in a perspective view, which comprises a first cylinder head cover element and a second cylinder head cover element;

[0021] Fig. 7-10 a schematic representation of assembly steps of a cylinder head cover according to the invention.

[0022] The following reference symbols are used in the figures:

[0023] D Camshaft rotation axis

[0024] 1 cylinder head cover base body

[0025] 2 bearing frames

[0026] 3 camshaft

[0027] 4 Axial bearing

[0028] 5 Sliding gearing

[0029] 6 Bearing (half) shell, bearing support or pivot bearing support 7 Actuator la first cylinder head cover element lb second cylinder head cover element

[0030] 31 fundamental wave

[0031] 32(a) Sliding cam

[0032] 33 Coupling rod

[0033] 34 Locking disc (functional component)

[0034] 35 Sensor wheel (functional component)

[0035] 321 first cam

[0036] 322 second cam

[0037] 323 Actuating gate

[0038] 41a first pin

[0039] 41b second pin

[0040] 42a first pin

[0041] 42b second pin

[0042] 43a Receiving opening

[0043] 43b Receiving opening

[0044] 43c Receiving opening

[0045] 43d Recording opening

[0046] 44a Receiving opening

[0047] 44b Receiving opening

[0048] 44c receiving opening

[0049] 44d receiving opening

[0050] Features and details described in connection with a method naturally also apply in connection with the device according to the invention and vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is or can always be made reciprocally. Furthermore, a method according to the invention that may be described can be carried out with the device according to the invention. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. As used herein, the singular forms "a" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.It will also be understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of the recited features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed elements.

[0051] First, reference is made to Fig. 1.

[0052] A cylinder head cover according to the invention essentially comprises a cylinder head cover base body 1, a bearing frame 2 and a camshaft 3 rotatably received in the cylinder head cover.

[0053] The camshaft 3 can, for example, be a sliding camshaft, comprising a base shaft 31 on which one or more sliding cams 32 are mounted so as to be axially displaceable but non-rotatable relative to the base shaft 31. For this purpose, for example, a sliding toothing can be provided between the base shaft 31 and the sliding cam 32. Alternative designs are also possible, such as non-round base shaft sections, in particular flat spots, and corresponding openings in the sliding cam 32 for receiving the base shaft section. The sliding cam 32 as such comprises an actuating gate 323 and a first cam 321 and at least one second cam 322 with different cam geometries.The sliding cam 32 is displaced axially on the base shaft 31 by means of an actuator 7, so that the first cam 321 or the second cam 322 can be brought into contact with the associated valve train as required.

[0054] If, as shown here, two sliding cams 32, 32a are connected to one another via a coupling rod 33, a locking disk 34 is preferably used, which ensures that displacement of the sliding cams 32, 32a or the coupling rod 33 is only possible in predetermined angular positions of the camshaft 3. The locking disk 34 represents a functional component of the camshaft 3. Other conceivable functional components are, for example, a sensor wheel, a cam, in particular a pump cam, etc. An axial bearing 4 is provided for the corresponding axial guidance or fixing of the functional component, in particular the locking disk 34, relative to the cylinder head cover or on the cylinder head cover.

[0055] According to the invention, it is provided that the axial bearing 4 is formed by at least one pair of pins 41a, 41b, wherein the functional component 34 is arranged in the axial direction between the pins 41a, 41b of the pin pair.

[0056] In one embodiment, if the functional component 34 is arranged axially displaceably on the camshaft 3, it is guided or held in an axial position relative to the cylinder head cover by the axial bearing 4 and can divert axially acting switching forces from the thrust bearing into the cylinder head cover or support them against it. If the functional component 34 is arranged axially fixedly on the camshaft 3, the axial bearing of the camshaft 3 can also be implemented in addition to diverting / supporting the switching forces. In other words, depending on whether the functional component 34 is mounted axially fixedly or axially displaceably on the camshaft, the axial bearing 4 provides axial support for the camshaft or only for the functional component 34.

[0057] It can be seen, in particular, in Figs. 1 to 3 that a pair of pins comprises a first pin 41a and a second pin 41b. As can be seen, the first pin 41a is arranged in the axial direction in front of the functional component 34, in particular the locking disc, and a pin 41b is arranged after the functional component 34.

[0058] It can also be seen that the axial bearing comprises a further pair of pins 42a, 42b, between which the functional component 34 is arranged. This further pair of pins also comprises a first pin 42a and a second pin 42b. As can be seen, the first pin 42a is arranged in the axial direction in front of the functional component 34, in particular the locking disc, and the second pin 42b is arranged after the functional component 34. However, the pin pairs 41a, 41b and 42a, 42b are arranged on different sides of the camshaft 3. It can also be seen that the pin pairs 41a, 41b and 42a, 42b are arranged perpendicular to the axis of rotation D of the camshaft 3. It is further preferably provided that the pins of the pin pair or the pins of the pin pairs 41a, 41b or 42a, 42b are received in sections in receiving openings 43a, 43b, 43c, 43d or 44a, 44b, 44c, 44d.

[0059] In the embodiment of the cylinder head cover shown here, the cylinder head cover comprises a cylinder head cover base body 1 and a bearing frame 2. The cylinder head cover base body 1 and the bearing frame 2 together essentially form the pivot bearings or pivot bearing receptacles 6 for the camshaft 3. The bearing frame 2 can be connected accordingly to the cylinder head cover base body 1, for example, using the screws shown.

[0060] It can advantageously be provided that the pins of the pin pair or the pins of the pin pairs 41a, 41b or 42a, 42b are arranged between the cylinder head cover base body 1 and the bearing frame 2. For this purpose, the receiving openings 43a, 43b, 43c, 43d or 44a, 44b, 44c, 44d for the pins 41a, 41b or 42a, 42b of the pin pairs can be provided both in the cylinder head cover base body 1 and in the bearing frame 2.

[0061] A further embodiment of the cylinder head cover according to the invention is shown in Figs. 4 and 5. Here, however, a sensor wheel 35 is provided as a functional component, which is fixed in the axial direction by the axial bearing 4 according to the invention.

[0062] The sensor wheel 35 is fixed on the shaft 3, so that the axial bearing of the camshaft 3 can be realized via this component (power transmission to the cylinder head cover).

[0063] For further details, reference can be made to the axial bearing of the locking disc 34 already outlined above.

[0064] Fig. 6 shows an embodiment of the cylinder head cover according to the invention, in which both the locking disc 34 and the sensor wheel 35 are fixed in the axial direction by means of the axial bearing 4 according to the invention. With regard to further details, reference can be made to the axial bearing 4 of the locking disc 34 or sensor wheel 35 already outlined above. Here, for example, the locking disc 34 is axially "displaceable / loose" on the camshaft 3 and serves to support the displacement forces in the cylinder head cover. Overdetermination or jamming can occur if the sensor wheel 35, which is axially fixedly mounted on the camshaft 3, is also guided by the pins 41 / 42 and the sensor wheel 35 is therefore fixed to the camshaft. An axial bearing of the camshaft 3 is possible. The camshaft can be guided axially in the cylinder head cover via the sensor wheel 35, which is fixed to the camshaft.

[0065] As already described above, the cylinder head cover comprises a cylinder head cover base body 1 and a bearing frame 2. Alternatively, the cylinder head cover can also comprise a first cylinder head cover element 1a and a second cylinder head cover element 1b. Here, too, it can be provided that the cylinder head cover elements are connectable to one another, preferably by means of a screw connection. Such a configuration is shown in Figs. 6a and 6b.

[0066] In principle, it can preferably be provided for all embodiments that the pin pairs 41a, 41b and 42a, 42b are arranged perpendicular to the axis of rotation D of the camshaft 3, the pins of the pin pair or the pins of the pin pairs 41a, 41b and 42a, 42b are received in receiving openings 43a, 43b, 43c, 43d and 44a, 44b, 44c, 44d, and / or at least one pin of the pin pair, preferably both pins of the pin pair 41a, 41b and 42a, 42b, are rotatably received in the receiving openings 43a, 43b, 43c, 43d and 44a, 44b, 44c, 44d. The pins 41a, 41b or 42a, 42b can also be firmly received in the provided receiving openings 43a, 43b, 43c, 43d or 44a, 44b, 44c, 44d.

[0067] The method according to the invention will be explained in more detail below with reference to Figs. 7 to 10. It is understood that only a few selected method steps are shown here, as they are helpful for understanding the method according to the invention. The method may include further steps or intermediate steps known to those skilled in the art.

[0068] Figure 7 shows a cylinder head cover base body 1 for a cylinder head cover according to the invention. The cylinder head cover base body 1 is equipped with receiving openings 43a, 43b and 44a, 44b for the pins 41a, 41b and 42a, 42b, respectively.

[0069] First, the camshaft 3 with the functional components 34, 35 is inserted into the bearing half-shells 6 of the cylinder head cover base body 1 (see in particular Fig. 8). In a further method step, the pins of the pin pair(s) 41a, 41b or 42a, 42b of the axial bearing 4 can be inserted section by section into the receiving openings 43a, 43b, 44a, 44b of the cylinder head cover base body 1 (Fig. 9). Accordingly, they protrude from the receiving openings of the cylinder head cover base body 1. Alternatively, the pins can also be inserted before the camshaft is inserted.

[0070] The bearing frame 2 is then placed onto the cylinder head cover base body 1. The bearing frame 2 and the cylinder head cover base body 1 complete the bearing mounts and pivot bearing mounts 6 for the camshaft 3. In addition, the pins 41a, 41b and 42a, 42b are inserted in sections into the receiving openings 43c, 43d and 44c, 44d of the bearing frame 2, completing the axial bearing 4 (Fig. 10).

[0071] As a result, the locking disc 34 is axially fixed. In the embodiment shown here, the functional component, in particular the locking disc 34, is connected to the base shaft 31 of the camshaft 3 by means of a sliding toothing 5. Accordingly, torques can be transmitted. However, the base shaft 31 and the locking disc 34 can in principle be moved relative to each other.

[0072] In principle, the pins 41a, 41b and 42a, 42b can also be pre-assembled in the bearing frame 2 and mounted together with it on the cylinder head cover base body 1. The advantage lies in the fact that the pins 41a, 41b and 42a, 42b are threaded on outside the cylinder head cover base body 1, making the pins easier to handle. After the bearing frame is installed, the pins engage in the receiving openings 43a, 43b and 44a, 44b for the pins in the cylinder head cover base body 1.

[0073] The process steps can ultimately also be applied to other or additional functional components, such as the sensor disc.

[0074] In principle, the functional component(s) 34, 35 can also be rigidly connected to the base shaft 31, so that the proposed axial bearing ultimately indirectly fixes the base shaft 31 or camshaft 3 axially in the cylinder head cover. Preferably, one functional component is rigidly connected to the base shaft, while the other functional components are movably connected to the base shaft, thus avoiding static overdetermination and allowing for thermal expansion. Such a configuration is shown in Fig. 6b.

[0075] Although the method is outlined here for the constellation of cylinder head cover base body 1 and bearing frame 2, the method can also be applied to the constellation of first cylinder head cover element 1a and second cylinder head cover element 1b.

Claims

Claims Cylinder head cover with a camshaft rotatably mounted in the cylinder head cover (3), wherein the camshaft is equipped with a functional component (34, 35) fixed axially on the camshaft (3) or a functional component (34, 35) mounted axially displaceably on the camshaft (3), characterized in that the axial bearing (4) comprises at least one pair of pins (41a, 41b or 42a, 42b), between which the functional component (34 or 35) is arranged. Cylinder head cover according to claim 1, characterized in that the pair of pins comprises a first pin (41a or 42a) and a second pin (41b or 42b). Cylinder head cover according to at least one of the preceding claims, characterized in that the axial bearing comprises a further pair of pins (42a, 42b), between which the functional component (34 or 35) is arranged. Cylinder head cover according to at least one of the preceding claims, characterized in that the pairs of pins (41a, 41b or 42a, 42b) are arranged perpendicular to the axis of rotation (D) of the camshaft (3). Cylinder head cover according to at least one of the preceding claims, characterized in that the pins of the pin pair or the pins of the pin pairs (41a, 41b or 42a, 42b) are received in sections in receiving openings (43a, 43b, 43c, 43d, 44a, 44b, 44c, 44d).Cylinder head cover according to at least one of the preceding claims, characterized in that at least one pin of the pin pair (41a, 41b or 42a, 42b), preferably both pins of the pin pair, are rotatably received in the receiving openings (43a, 43b, 43c, 43d, 44a, 44b, 44c, 44d). Cylinder head cover according to at least one of the preceding claims, characterized in that the cylinder head cover comprises a cylinder head cover base body (1) and a bearing frame (2), wherein connection openings (43a, 43b, 43c, 43d, 44a, 44b, 44c, 44d) for the pins (41a, 41b or 42a, 42b) are provided both in the. Cylinder head cover base body (1), as well as in the bearing frame (2). Cylinder head cover according to at least one of the preceding claims, characterized in that the cylinder head cover comprises a first cylinder head cover element (1a) and a second cylinder head cover element (1b), wherein connection openings (43a, 43b, 43c, 43d, 44a, 44b, 44c, 44d) for the pins (41a, 41b or 42a, 42b) are provided both in the first cylinder head cover element (1a) and in the second cylinder head cover element (1b). Cylinder head cover according to at least one of the preceding claims, characterized in that the functional component is a locking disc (34), a sensor wheel (35), or a cam, in particular a pump cam. Cylinder head cover according to at least one of the preceding claims, characterized in that the camshaft is a sliding camshaft, comprising a base shaft (31) and at least one sliding cam (32, 32a), wherein the sliding camshaft in particular comprises two sliding cams (32, 32a) which are connected to one another by means of a coupling rod (33).Cylinder head cover according to at least one of the preceding claims, characterized in that the functional component (34, 35) is optionally mounted fixedly or axially displaceably on the camshaft (3). A method for assembling a cylinder head cover according to at least one of the preceding claims, comprising the following method steps: - Inserting the camshaft (3) with the functional components (34, 35) into bearing half-shells (6) of the cylinder head cover base body (1); - inserting the pins (41a, 41b or 42a, 42b) into the receiving openings (43a, 43b, 43c, 43d) of the cylinder head cover base body (1) or of the first cylinder head cover element (1a); - Placing the bearing frame (2) or the second cylinder head cover element (lb) onto the cylinder head cover base body (1) or the first cylinder head cover element (la), wherein the pins (41a, 41b or 42a, 42b) are inserted in sections into the receiving openings (44a, 44b, 44c, 44d) of the bearing frame (2) or second cylinder head cover element (lb).

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