DE19747244A1 - Cylinder head for internal combustion engine - Google Patents

Abstract

The motor cylinder head (10) has lateral ribs (2) and aligned half-shells for sections (4) of a mantle surface (12) of a camshaft (5). A half-shell is pierced near a rib (2) to give hydraulic fluid channels (6,7), linked to an annular channel (8,9) at the section (4), with a path (10,11) to pass the fluid through the camshaft (5). The pierced half-shell has openings to bolt the cylinder head (1) to the crankcase or at least for a cam follower. The half-shell has a thin-wall sliding bearing (14), of the rib width dimensions, with a fluid passage (15,16) for each annular channel.

Description

Field of the Invention

The invention relates to a cylinder head of an internal combustion engine with an internal Combustion, the webs running transversely to its longitudinal extent end half shells for overlying sections of a lateral surface of a Owns camshaft.

Background of the Invention

Such a cylinder head is generic from DE-OS 39 43 727 ( Fig. 1) and can be used in spark-ignition internal combustion engines (see column 2, lines 37-44). Whose webs are cut in the area of the half-shells from recesses for tappets, whereby cylinder heads are also known, whose webs are cut from recesses for the assembly of screwing means (cylinder head crankcase). If a device for hydraulic camshaft adjustment is now to be attached to an end face of one of the camshafts, it is advisable to guide hydraulic medium to paths in the camshaft via, for example, two feed lines through the web adjacent to the device and its half-shell. The paths then lead to hydraulic fluid chambers in the device. This turning handle must be realized via ring grooves in the outer surface of the camshaft or within the bearing shell.

Due to the cut-outs minimizing the width of the webs, it turns out an arrangement of the leads in the corresponding web as problematic. In In many cases, at least one supply line would be the recess or guide cut hole. This leads to severe losses in this area Hydraulic fluid. A broadening of the webs or increasing their distance is also unacceptable.

Summary of the invention

The object of the invention is therefore a cylinder head of the aforementioned To create genus in which the disadvantages shown are eliminated.

According to the invention, this object is achieved by the features of the main claim solved, expedient concretizations subject of the subclaims are.

Due to the thin-walled plain bearing ring proposed according to the invention the described hydraulic fluid losses in a simple way elimi kidney. This plain bearing ring thus covers the recess for the corresponding the cam follower or for mounting the screwing device. Advantageously this plain bearing ring extends over an entire width of the half-shell of the relevant web. However, solutions are also conceivable in which he only covers the corresponding recess as a segment.

Of course, the scope of this invention also applies to Cylinder heads in which only one supply line or three and more to Camshaft are realized. It is also conceivable to use these feed lines to  Camshaft hydraulic fluid for spray or contact lubrication in the cylinder to transport the head area.

The plain bearing ring can be applied to its bore area Wear protection layer be provided.

In an expedient development of the invention, it is proposed to slide bearing ring with the same division as the half-shell. However is it is also conceivable to manufacture the plain bearing ring as a fully cylindrical part, then an insert of a built camshaft is to be provided.

Brief description of the drawing

The invention is advantageously explained in more detail with reference to the drawing.

Show it:

Fig. 1 is a plan view of a cylinder head in the region of an outer web with partial view of a camshaft and

Fig. 2 shows a cylinder head according to Fig. 1 with mounted slide bearing ring.

Detailed description of the drawing

Figs. 1 and 2 disclose a section of a cylinder head 1, and it is in the art known as such. The cylinder head 1 has crosspieces 2 extending transversely to its longitudinal extent. End faces of the webs 2 have half-shells 3 , which are cursed to one another in the longitudinal direction of the cylinder head 1. In these half-shells 3 there are sections 4 of a lateral surface 12 of a camshaft 5 for the purpose of their storage. As can be seen from Fig. 1 in more detail, the outer half-shell 3 is sectionally sectioned by a recess 13. This is used to mount a screw for connecting the cylinder head 1 with a crankcase. Because of this arrangement, for example, a distance between the webs 2 can be chosen to be relatively small. - Also configurations are conceivable in which the recess 13 completely cuts the half-shell 3 -.

As disclosed in FIG. 2, a feed line 6 , 7 runs through the outer web 2 ; here for hydraulic fluid. A split plain bearing ring 14 is arranged in the half-shell 3 . This covers the zone of the recess 13 which intersects the half-shell 3 . Passages 15 , 16 in the slide bearing ring 14 correlate with ends of the feed lines 6 , 7 . The latter is arranged stationary in the half-shell 3 .

As mentioned, the camshaft 5 lies with the section 4 of its lateral surface 12 on a bore of the slide bearing shell 13 for the purpose of the bearing. Radially inward alignment with the passages 15 , 16 are annular channels 8 , 9 in the lateral surface 12 of the camshaft 5th From the annular channels 8 , 9 , paths 10 , 11 lead within the camshaft 5 for the transmission of the hydraulic medium to a device 17 ( not shown in more detail) for the relative adjustment of the camshaft 5 with respect to a drive wheel driving it. For better hydraulic medium tapping, several paths 10 , 11 distributed in the circumferential direction of the camshaft 5 are advantageously applied.

The slide bearing ring 14 can be fixed in position on the end face via radially outwardly shaped ends on the end faces of the web 2 (not shown). Also not ge shows, but expressly included within the scope of this invention, are configurations in which, for example, the half-shell 3 cutting recesses for bores for bucket tappets or other cam followers or tool outlets and the like. are covered by the plain bearing ring 14 .

Reference list

1

Cylinder head

2nd

web

3rd

Half shell

4th

section

5

camshaft

6

Supply

7

Supply

8th

Ring channel

9

Ring channel

10th

path

11

path

12th

Lateral surface

13

Recess

14

Plain bearing ring

15

Passage

16

Passage

17th

contraption

Claims (3)

1. Cylinder head ( 1 ) of an internal combustion engine with the following features:

• a) the cylinder head ( 1 ) has crosspieces ( 2 ) running transversely to its longitudinal extension with frontal half-shells ( 3 ) which extend over an entire or a large part of a crosspiece width and are aligned with one another for overlying sections ( 4 ) of a lateral surface ( 12 ) of a camshaft ( 5 );
• b) in the area of at least one web ( 2 ) whose half-shell ( 3 ) is cut by one or more supply lines ( 6 , 7 ) for a fluid such as hydraulic fluid, each supply line ( 6 , 7 ) having an opposite annular channel ( 8 , 9 ) communicates in section ( 4 ), which is connected to a path ( 10 , 11 ) for further transmission of the fluid through the camshaft ( 5 );
• c) at least the half-shell ( 3 ), which is cut by the feed line (s) ( 6 , 7 ), has at least one recess ( 13 ) for mounting a screw means for connecting the cylinder head ( 1 ) to a crankcase or at least one recess ( 13 ) for a Nockenfol ger;
• d) in this half-shell ( 3 ) a thin-walled plain bearing ring ( 14 ) is positioned in the measure of the web width and
• e) the plain bearing ring ( 14 ) has a respective passage ( 15 , 16 ) for the fluid for each feed line ( 6 , 7 ) / ring channel ( 8 , 9 ).

2. Cylinder head according to claim 1, characterized in that the sliding bearing ring ( 14 ) has the same division as the half-shell ( 3 ). 3. Cylinder head according to claim 1, characterized in that the cam shaft ( 5 ) is provided with a device ( 17 ) for its relative adjustment in relation to a drive wheel driving it, to which device ( 17 ) the fluid via at least one of the paths or both paths ( 10 , 11 ) is conductive.