WO2007042014A1

WO2007042014A1 - Dual-component cylinder head cover

Info

Publication number: WO2007042014A1
Application number: PCT/DE2006/001803
Authority: WO
Inventors: Nenad Cvjeticanin; Thomas DÖLL; Friedhelm Schreiber
Original assignee: Woco Industrietechnik Gmbh
Priority date: 2005-10-13
Filing date: 2006-10-12
Publication date: 2007-04-19
Also published as: DE102005048953A1; DE102005048953B4

Abstract

The invention relates to a cylinder head cover (1, 1') for connecting to a cylinder head, said cover comprising a cover body (10, 10'), at least one seal (30) and a seal holder, the seal (30) extending at least partially into the seal holder and at least partially protruding past the same with at least one first sealing lip (31, 31 ) in the direction of the cover body (10, 10'). The cover body (10, 10') can be connected to the seal holder by means of a catch connection and/or a snap connection (12, 22; 12', 14'a, 14'b, 14'c, 24'), and is formed from a thermoplastic material. A frame (20, 20') formed from a thermosetting material surrounds the seal holder and is provided with a plurality of fixing openings (21, 21') for fixing means for fixing the cylinder head cover (1, 1') to the cylinder head, either directly or by means of a ladder frame.

Description

Two-component cylinder head cover

description

The present invention relates to a cylinder head cover for connection to a cylinder head, comprising a hood body, at least one seal and a seal holder, wherein the seal at least partially extends into the seal holder and projects beyond it at least partially with at least one first sealing lip in the direction of the hood body, and the Hood body is connected via a latching and / or snap connection with the seal holder.

Cylinder head covers are engine components which combine essentially four functions, namely oil-tightness, crankcase pressure control, oil separation and acoustics.

In the prior art, it is customary to connect a cylinder head cover via an adhesive element with a cylinder head, see WO 02/057611 Al, as is customary also in Ölpfannenanord- according to WO 03/016685 Al.

Special sealing arrangements in connection with cylinder head covers have also already been discussed in many ways, in particular using a hard plastic insert for stabilizing a seal according to JP 2002243042 A. A generic cylinder head cover is known from DE 196 23 336 C2. In the known cylinder head cover, the hood body made of metal, in particular aluminum, formed so that the compensation of manufacturing tolerances and for a permanent and reliable sealing the use of the seal holder made of glass fiber reinforced plastic, preferably polyamide with glass fibers, with openings for the seal made of rubber is necessary , The seal holder holds while the clamped between a groove bottom in the hood body and a cylinder head gasket form-fitting and is connected to the hood body via snap-fit connections. To connect the hood body with the cylinder head Befestigungsöffhungen for performing fastening screws are provided in the edge of the hood body.

Cylinder head covers are now increasingly made of plastic. For example, from DE 296 12 020 Ul a thermoplastic cylinder head cover is known, which has an integrally formed mounting flange with a plurality of each reinforced by a metal support sleeve holes for receiving metallic mounting screws over the interposition of a seal a firm connection with a cylinder head is made possible. It is important for the fulfillment of the sealing function over the entire service life of an engine, with which the cylinder head cover is to be used, to maintain a sufficient contact stress between the seal and on the one hand the cylinder head cover and, on the other hand, the cylinder head. This assumes that the deformation in the flange region of the cylinder head cover is kept low. In the known cylinder head covers made of thermoplastic, it is necessary in addition to the use of metal sleeves to keep the distances between the screw points for the mounting screws low due to the specific material properties of the thermoplastic, but this is associated with the disadvantage that the number of mounting screws is large.

Object of the present invention is therefore to develop the generic cylinder head cover such that it overcomes the disadvantages of the prior art.

This object is achieved according to the invention in that the hood body is formed from a thermoplastic, and a frame which comprises the seal holder and is provided with a plurality of attachment openings for fastening means for fastening the cylinder head cover, either directly or via a ladder frame, with the cylinder head, is formed of a thermosetting plastic. 6 001803

It can be provided that the hood body comprises a plurality of latching hooks and / or retaining shoulders, as part of the latching and / or snap connection, preferably from an edge of the hood body for engaging the frame, in particular in recesses and / or undercuts in the frame, and / or extend around the frame.

The invention also proposes that the recesses of the frame are provided along its outer circumference, preferably equidistantly, between the attachment openings, and / or the undercuts of the frame extend along at least part of its outer circumference, preferably outside the regions of the attachment openings.

Preferred embodiments of the invention are, characterized in that the hood body does not extend into the region of the mounting holes in the frame, wherein the hood body is preferably at least partially reinforced adjacent to the mounting holes, in particular in the form of providing reinforcing ribs.

According to the invention, it can further be provided that the hood body has at least one groove for at least partially receiving the first sealing lip of the seal, preferably in the region of its edge.

According to the invention, the seal with at least one second sealing lip in the direction of the cylinder head projects beyond the frame at least in regions.

It can be provided that the first sealing lip is connected to the second sealing lip via a connecting body.

The first sealing lip may be larger or smaller than the second sealing lip.

Furthermore, it can be provided that the seal of an elastomer, in particular a thermoplastic elastomer, molded, in particular injected, is. According to the invention cylinder head covers are preferred, which are characterized in that the seal is at least partially injected or vulcanized into the frame.

Furthermore, it can be provided that the frame is provided in the region of the outlet of the seal from the same in the form of the first and / or second sealing lip with a groove.

Finally, it can also be provided that the frame also includes the lead frame.

The invention is therefore based on the surprising finding that the positive properties on the one hand of thermoplastics and on the other hand of thermosets in a cylinder head cover can be integrated. The actual hood body should thereafter be designed as a thermoplastic part, so that all the advantages of Thermoplastfügetechnik to achieve a high degree of integration available, while a flange made of a thermoset material with high rigidity and low tendency to deform at high temperatures it allows bolting for attachment of the cylinder head cover on a Cylinder head reduce in number, without causing any loss of tightness.

Moreover, it is particularly advantageous if the seal required between the cylinder head cover and the cylinder head with the flange frame, preferably as a two-component unit, is produced in one piece. A conventional rubber gasket, such as acrylic rubber, may be used in the Duroplast flange frame for this purpose; and a thermoplastic elastomer gasket may itself be injected into the flange frame while the connection between the thermoset frame and the thermoplastic hood body is made by means of gluing.

Cylinder head covers according to the invention therefore have the following advantages:

- Higher rigidity in the sealing area due to the use of the thermoset material for the flange frame;

- Lower risk of leakage between the cylinder head cover and cylinder head due to the higher rigidity of the flange frame;

- Less number of Verschraubungspunkten for attachment of the cylinder head cover to the cylinder head by the higher rigidity of the flange frame; - Lower deformation of the cylinder head cover due to the high rigidity of the flange frame;

- lower tooling costs due to lower delay;

- Elimination of metal bushings in the range of mounting screws due to the high rigidity of the flange frame;

- Elimination of the assembly of the seal by molding the seal together with the flange frame; and

- Lower mass of the component due to the absence of metal components.

Further features and advantages of the invention will become apparent from the following description in which two embodiments of the invention with reference to schematic drawings is exemplified. It shows:>

Figure 1 is a perspective view, from above, of a first inventive cylinder head cover;

FIG. 2 shows a perspective partial sectional view, from below, of the first cylinder head housing of FIG. 1;

FIG. 3 shows an animation of the deformation of a seal for the first cylinder head cover of FIGS. 1 and 2 in the case of load;

Figure 4 is a plan view, from above, of a second cylinder head cover according to the invention;

Figure 5a is a longitudinal sectional view through the second cylinder head cover of Figure 4;

FIG. 5b shows a partial enlargement from FIG. 5a; and

FIG. 6 shows a cross-sectional view, from the front, of the second cylinder head cover according to the invention.

As can be seen in FIGS. 1 and 2, a first cylinder head cover 1 according to the invention comprises a hood body 10, a flange frame 20 and a seal 30.

The hood body 10 is itself formed from a thermoplastic with a peripheral edge 11 and extending away from this latching hook 12. In Figure 2, a groove 13 in the region of the edge 11 of the hood body 10 can also be easily seen. The flange frame 20 is formed from a thermoset, with mounting holes 21 for mounting screws, not shown, for attaching the cylinder head cover 1 to a cylinder head, not shown, with recesses 22 for engaging the locking hooks 12 of the hood body 10 and a recess 23 for the seal 30th

The seal 30 is in turn formed with a first, larger sealing lip 31, a connecting body 32 and a second, smaller sealing lip 33, see FIG. 3.

The seal 30 and the flange frame 20 are formed as a component, wherein the seal 30 is at least partially injected into the flange frame 20, so the recess 23 is filled in the flange frame 20 of the seal 30 and the two sealing lips 31, 33 on opposite sides of the flange frame 20 protrude over the same itself. The first sealing lip 31 is formed such that it is pressed in the case of attachment of the hood body 10 to the flange frame 20 by locking the locking hooks 12 of the hood body 10 in the recesses 22 of the flange frame 20 into the groove 13 so as to connect between the Seal flange frame 20 and the hood body 10. The second sealing lip 33 then serves the tight connection of the cylinder head cover 1 with the cylinder head after mounting the cylinder head cover 1 on the cylinder head by screwing not shown, extending through the mounting holes 21 of the flange 20 mounting screws.

Sealing forces can thus be absorbed by the flange frame 20 due to its high rigidity to the cylinder head, between the mounting points in the region of the mounting holes 21, while perpendicular to the defined by the mounting holes 21 sealing line of the hood body 10 made of thermoplastic to the first sealing lip 31 sealing forces are taken out , The same applies between the cylinder head cover 1 and the cylinder head, namely by interposition of the second sealing lip 33. In Figure 3, the load case of the seal 30, so the compression of the sealing lips 31 and 33 shown in the assembled state of the cylinder head cover 1 on the cylinder head. Beautifully recognizes the strong compression in the region of the two sealing lips 31 and 33, compared to the connecting body 32nd

The novel cylinder head cover concept according to the invention makes it possible by the combination of the positive properties of thermoplastic and thermoset to optimize the Fulfillment of the function of oil-tightness, pressure control of a crankcase, oil separation and the acoustics of a cylinder head cover.

This novel concept is also evident in the second cylinder head cover V according to the invention, shown in FIGS. 4 to 6, which in turn has a hood body 10 'made of a thermoplastic and a flange frame 20' made of a duroplastic.

The second cylinder head cover 1 'according to the invention differs from the first cylinder head cover 1 according to the invention essentially by its dimensioning and geometry, in particular due to the different configuration of the end regions, which results in particular from an edge 11' of the hood body 10 'at one end, namely in the edge region 11 'a, as shown in Figure 5 a, is offset downwards, while at the opposite end, namely in the edge region 1 l'b, an offset is shown upwards in Figure 5a. This upward shift is provided only in the middle of the other end, in an arcuate manner, as can be seen in FIG.

Furthermore, the hood body 10 'not only has latching hooks 12' for engaging undercuts 24 'of the flange frame 20', but also retaining shoulders 14'a, and 14'b and 14'c for embracing the flange frame 20 'and the Secure connection between the hood body 10 'and the flange frame 20'. It should be noted that the hood body 10 'substantially surrounds the flange frame 20', except in the area of mounting holes 21 'for mounting screws, not shown, for securing the cylinder head cover 1' to a cylinder head, not shown. The edge 11 'of the hood body 10' has in the vicinity of the attachment opening 21 'in the flange frame 20' reinforcing ribs 15 '.

Further, also in the second cylinder head cover 1 'of the present invention, the flange frame 20' is formed with a thermoplastic elastomer seal as a two-component component. More precisely, in a not-shown recess in the flange frame 20 ', the seal is injected, so that it projects beyond the flange frame 20' in the form of two sealing lips 31 ', 33'. A first sealing lip 31 'extends from the flange frame 20' to the hood body 10 'and the second sealing lip 33' extends from the flange frame 20 'in the direction of the cylinder head, in the installation situation. Around Sealing lips 31 ', 33', the flange frame 20 'also grooves 25', 26 'to secure the stop.

The features of the invention disclosed in the foregoing description, in the claims and in the drawings may be essential both individually and in any combination for the realization of the invention in its various embodiments.

LIST OF REFERENCE NUMBERS

1, 1 'Cylinder head cover

10, 10 'hood body

11, 11 'edge ll'a, ll'b edge area

12, 12 'snap hooks

13 groove

14'a, 14'b, 14'c holding shoulder 15 'reinforcing rib

20, 20 'flange frame

21, 21 'attachment opening

22 recess

23 recess

24 'undercut

25 'groove

26 'groove

30 seal

31, 31 'sealing lip

32 connecting body

33, 33 'sealing lip

Claims

claims

A cylinder head cover (I ₅ 1 ') for connection to a cylinder head comprising a hood body (10, 10'), at least one seal (30) and a seal retainer, said seal (30) extending at least partially into and sealing the seal retainer with at least a first sealing lip (31, 31 ') in the direction of the hood body (10, 10') at least partially surmounted, and the hood body (10, 10 ') via a latching and / or snap connection (12, 22, 12', 14'a, 14'b, 14'c, 24 ') is connectable to the seal holder, characterized in that the hood body (10, 10') is formed from a thermoplastic, and a frame (20, 20 '), the the seal holder and having a plurality of fastening openings (21, 21 ') for fastening means for fixing the cylinder head cover (1, 1'), either directly or via a lead frame, is provided with the cylinder head, formed of a thermosetting plastic.

2. Cylinder head cover according to claim 1, characterized in that the hood body (10, 10 ') has a plurality of latching hooks (12, 12') and / or retaining shoulders (14'a, 14'b, 14'c) as part of the catch - And / or snap connection, preferably from a rim (11, 11 ', 11' a, 11 'b) of the hood body (10, 10') for engaging the frame (20, 20 '), in particular in recesses (22) and / or at undercuts (24 ') in the frame (20, 20'), and / or for embracing the frame (20 ') extend away.

3. Cylinder head cover according to claim 2, characterized in that the recesses (22) of the frame (20) along its outer circumference, preferably equidistantly, between the Befestigungsöffhungen (21) are provided, and / or the undercuts (24 ') of the frame (20 ') extend along at least a part of its outer periphery, preferably outside of the areas of Befestigungsöffhungen (21').

4. Cylinder head cover according to one of the preceding claims, characterized in that the hood body (10, 10 ') does not extend into the region of the fastening openings (21, 21') in the frame (20, 20 '), the hood body (10') preferably at least in regions adjacent to the fastening openings (21 ') is reinforced, in particular in the form of providing reinforcing ribs (15 ').

5. Cylinder head cover according to one of the preceding claims, characterized in that the hood body (10) has at least one groove (13) for at least partially receiving the first sealing lip (31) of the seal (30), preferably in the region of its edge (11) ,

6. Cylinder head cover according to one of the preceding claims, characterized in that the seal (30) with at least one second sealing lip (33, 33 ') in the direction of the cylinder head, the frame (20, 20') at least partially surmounted.

7. Cylinder head cover according to claim 6, characterized in that the first sealing lip (31, 31 ') with the second sealing lip (33, 33') via a connecting body (32) is connected.

8. Cylinder head cover according to claim 6 or 7, characterized in that the first sealing lip (31) is greater than the second sealing lip (33) or the second sealing lip (33 ') is greater than the first sealing lip (31').

9. Cylinder head cover according to one of the preceding claims, characterized in that the seal (30) made of an elastomer, in particular a thermoplastic elastomer, molded, in particular injection molded.

10. Cylinder head cover according to one of the preceding claims, characterized in that the seal (30) is at least partially injected into the frame (20, 20 ') or vulcanized into it.

11. Cylinder head cover according to one of the preceding claims, characterized in that the frame (20 ') in the region of the outlet of the seal from the same in the form of the first and / or second sealing lip (31', 33 ') having a groove (25' , 26 ') is provided.

12. Cylinder head cover according to one of the preceding claims, characterized in that the frame also comprises the lead frame.