Cylinder head

Abstract

An internal combustion engine-includes at least one cylinder crankcase, at least one cylinder head (2) including at least one valve cover (1), charge-cycle valves, a valve train-assembly, injectors (3), an injector cable harness, injection lines (4), a fuel rail (5) and a pre-separator for separating the oil aerosols present in the blow-by volume flow being situated in the cylinder head (2).

Claims

1. An internal combustion engine comprising: a cylinder crankcase; a cylinder head; a valve cover; wherein the cylinder head includes charge-cycle valves, a valve train-assembly, an injector, an injector cable harness, injection lines, a fuel rail, and a web; wherein the valve cover includes a valve train space accommodating the valve train-assembly, a fuel rail space accommodating the fuel rail, and a deflector plate extending downward from a top of the valve cover, wherein the web and the deflector plate are configured in a manner of a maze and separate the valve train space from the fuel rail space, and wherein the deflector plate includes slots constituting unsealed passages from a valve train space into the fuel rail space allowing gas to transfer from the valve train space into the fuel rail space.

2. The internal combustion engine as recited in claim 1, wherein the internal combustion engine conducts oil aerosols from the cylinder crankcase into a blow-by volume flow that is between the cylinder head and the valve cover.

3. The internal combustion engine as recited in claim 2, wherein the cylinder head includes the charge-cycle valves and the injector cable harness in the blow-by volume flow.

4. A method for operating the internal combustion engine recited in claim 2 comprising: separating, by a pre-separation chamber downstream of the deflector plate, the oil aerosols present in the blow-by volume flow.

5. The internal combustion engine as recited in claim 1, wherein an area including the fuel rail and provided as a pre-separation chamber for oil aerosol separation is situated between the cylinder head and the valve cover.

6. The internal combustion engine as recited in claim 1, wherein a drainage passage is situated in the cylinder head in such a way that separated oil is discharged through the cylinder crankcase into an oil pan.

7. The internal combustion engine as recited in claim 1, at least one of the web and the deflector plate includes drip edges.

8. The internal combustion engine as recited in claim 1, wherein an area in which the fuel rail is situated includes a splashboard, the splashboard delimiting a separate pre-separation space.

9. The internal combustion engine as recited in claim 1 wherein the web vertically overlaps the deflector plate, the deflector plate and the web separating a first space including the valve train-assembly from a second space including the fuel rail, the first space and second space defined by the valve cover and the cylinder head.

10. The internal combustion engine as recited in claim 1 further comprising a splashboard extending downward from a top of the valve cover in the fuel rail space.

11. The internal combustion engine as recited in claim 10 wherein the splashboard extends downward while angling away from the deflector plate.

12. The internal combustion engine as recited in claim 1 wherein the cylinder head includes a drainage passage for discharging separated oil in the fuel rail space.

13. The internal combustion engine as recited in claim 12 wherein the web is formed integrally with the cylinder head.

14. The internal combustion engine as recited in claim 13 wherein the injection lines pass through the deflector plate and over the web.

15. The internal combustion engine as recited in claim 14 wherein the injection lines pass through the slots in the deflector plate, the slots being vertically extending slots.

16. The internal combustion engine as recited in claim 15 wherein the web vertically overlaps the deflector plate such that a top edge of the web is vertically above a bottom edge of the deflector plate.

17. The internal combustion engine as recited in claim 13 wherein the web extends between a bottom wall and two side walls of the cylinder head.

18. The internal combustion engine as recited in claim 13 wherein the deflector plate extends between a top wall and two side walls of the valve cover.

19. The internal combustion engine as recited in claim 1 wherein a lower edge of the valve cover rests on top of and in contact with the cylinder head.

20. An internal combustion engine comprising: a cylinder crankcase; charge-cycle valves; a valve train-assembly; an injector; an injector cable harness; injection lines; a fuel rail; a cylinder head; a valve cover, a lower edge of the valve cover rests on top of and in contact with the cylinder head, the cylinder head and the valve cover defining a space receiving the charge-cycle valves, the valve train-assembly, the injector, the injector cable harness, the injection lines, and the fuel rail; and a deflector plate extending downward from a top of the valve cover, the deflector plate including vertically-extending slots extending upward from a bottom edge of the deflector plate, the vertically-extending slots being horizontally spaced apart from each other, the deflector plate dividing the space defined by the cylinder head and the valve cover into a valve train space including the valve train-assembly and a fuel rail space including the fuel rail, the injection lines passing horizontally through the vertically-extending slots, the vertically-extending slots configured for surrounding the injection lines in a manner allowing gas to transfer from the valve train space into the fuel rail space around the injection lines through the vertically-extending slots.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further important features and advantages are derived from the subclaims, from the drawing, and from the following description of one preferred exemplary embodiment based on the drawing.

(2) FIG. 1 shows a cross-section through the cylinder head of the internal combustion engine, including the valve cover;

(3) FIG. 2 shows a longitudinal section through the cylinder head from FIG. 1;

(4) FIG. 3 shows a top view onto the cylinder head from FIGS. 1 and 2 without the valve cover; and

(5) FIG. 4 shows an alternative cross-section through the cylinder head of the internal combustion engine.

DETAILED DESCRIPTION

(6) The internal combustion engine includes a crankcase 10, a cylinder head 2 and a valve cover 1. Charge-cycle valves, a valve train-assembly, injectors 3, an injector cable harness 11 (shown schematically), injection lines 4, a fuel rail 5 and a pre-separator 12 for separating the oil aerosols present in the blow-by volume flow 14 are situated in cylinder head 2. The installation space d provided for the fuel rail is simultaneously used as the pre-separation chamber 16 for the oil aerosol separation, as is illustrated in FIG. 1. Installation space d surrounding fuel rail 5 serves as a calming space for the agglomeration or coagulation of the oil drops. The installation space d for the installation of the rail 5 is separated from valve train space a by a web b in the casting contour of the cylinder head 2 as well as a deflector plate c integrated into the valve cover. The gas transfer from valve train space a into fuel rail space or calming space d occurs via passages h necessary for feeding through high pressure lines 4 of injectors 3.

(7) FIG. 2 shows a cylinder head 2 and a valve cover 1 of the internal combustion engine. Gas exchange valves, the valve train, injectors, an injector cable harness, injection lines 4, a fuel rail 5 and a pre-separator for separating the oil aerosols present in the blow-by volume flow are situated in cylinder head 2. The installation space provided for fuel rail 5 is simultaneously used as the pre-separation chamber for the oil aerosol separation, as is illustrated in FIG. 1. Installation space d surrounding fuel rail 5 serves as a calming space for the agglomeration or coagulation of the oil drops. The installation space d for the installation of the rail 5 is separated from valve train-assembly space a by a web b in the casting contour of the cylinder head as well as a deflector plate c integrated into the valve cover. The gas transfer from valve train-assembly space a into fuel rail space or calming space d occurs via passages h necessary for feeding through high pressure lines 4 of injectors 3.

(8) FIG. 3 shows a top view onto cylinder head 2 from FIGS. 1 and 2 without the valve cover. Charge-cycle valves 18, 20 (a pair of which are shown schematically), the valve train-assembly 22 (shown schematically), injectors 3, an injector cable harness, injection lines 4, a fuel rail 5 and a pre-separator for separating the oil aerosols present in the blow-by volume flow are situated in cylinder head 2. The installation space provided for the fuel rail is simultaneously used as the pre-separation chamber for the oil aerosol separation, as is illustrated in FIG. 1. Installation space d surrounding fuel rail 5 serves as a calming space for the agglomeration or coagulation of the oil drops. The installation space for the installation of the rail is separated from the valve train-assembly space by a web b in the casting contour of the cylinder head as well as a deflector plate c integrated into the valve cover. The gas transfer from valve train-assembly space a into fuel rail space or calming space d occurs via passages h necessary for feeding through high pressure lines 4 of injectors 3. The separated oil quantity is discharged by a drainage option i through the crankcase into the oil pan.

(9) FIG. 4 shows an internal combustion engine which includes a cylinder head 2 and a valve cover 1, Charge-cycle valves, a valve train-assembly, injectors, an injector cable harness, injection lines 4, a fuel rail 5 and a pre-separator for separating the oil aerosols present in the blow-by volume flow are situated in cylinder head 2. The installation space provided for the fuel rail is simultaneously used as the pre-separation chamber for the oil aerosol separation, as is illustrated in FIG. 1. Installation space d surrounding fuel rail 5 serves as a calming space for the agglomeration or coagulation of the oil drops. The installation space for the installation of the rail is separated from the valve train-assembly space by a web b in the casting contour of the cylinder head as well as a deflector plate c integrated into the valve cover. The gas transfer from valve train-assembly space a into fuel rail space or calming space d occurs via passages h which are necessary for feeding through high pressure lines 4 of injectors 3 and equipped with drip edges e for optimizing or reducing the oil entrainment into the calming space. An additional splashboard f, which delimits a separate pre-separation space g, protrudes into calming space d for further optimization of the pre-separation power.

LIST OF REFERENCE NUMERALS

(10) 1 Valve cover 2 Cylinder head of internal combustion engine 3 Injector 4 High pressure or injection line 5 Fuel rail 10 crankcase 11 injector cable harness 12 pre-separator 14 blow-by volume flow 16 pre-separation chamber 18, 20 charge-cycle valves 22 valve train-assembly a Valve train-assembly space b Web c Deflector plate d Calming space/installation space for the fuel rail e Drip edge f Splashboard g Separate pre-separation chamber h Passage for high pressure line i Drainage passage