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

1-8. (canceled)

9. An internal combustion engine comprising: a cylinder crankcase; a cylinder head including a valve cover, charge-cycle valves, a valve train-assembly, an injector, an injector cable harness, injection lines, a fuel rail and a pre-separator for separating oil aerosols present in a blow-by volume flow situated in the cylinder head.

10. The internal combustion engine as recited in claim 9, wherein the internal combustion engine conducts oil aerosols from the cylinder crankcase through an area between the cylinder head and the valve cover.

11. The internal combustion engine as recited in claim 9, wherein an area including the fuel rail and provided as a pre-separation chamber for the oil aerosol separation is situated between the cylinder head and the valve cover.

12. The internal combustion engine as recited in claim 9, 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.

13. The internal combustion engine as recited in claim 9, wherein an area in the cylinder head in which the injector is situated and an area in which the fuel rail is situated are separated from one another by a deflector plate and a web, the deflector plate being configured in a manner of a maze.

14. The internal combustion engine as recited in claim 13, at least one of the web and the deflector plate includes drip edges.

15. The internal combustion engine as recited in claim 9, wherein an area in which the fuel rail is situated includes a splashboard, the splashboard delimiting a separate pre-separation space.

16. The internal combustion engine as recited in claim 9, wherein the cylinder head includes charge-cycle valve and an injector cable harness in the blow-by volume flow situated in the cylinder head.

17. A method for operating the internal combustion engine recited in claim 9 comprising: separating, by the pre-separator, the oil aerosols present in the blow-by volume flow situated in the cylinder head.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] FIG. 1 shows a cross-section through the cylinder head of the internal combustion engine, including the valve cover;

[0018] FIG. 2 shows a longitudinal section through the cylinder head from FIG. 1;

[0019] FIG. 3 shows a top view onto the cylinder head from FIGS. 1 and 2 without the valve cover; and

[0020] FIG. 4 shows an alternative cross-section through the cylinder head of the internal combustion engine.

DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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

[0025] 1 Valve cover [0026] 2 Cylinder head of internal combustion engine [0027] 3 Injector [0028] 4 High pressure or injection line [0029] 5 Fuel rail [0030] 10 crankcase [0031] 11 injector cable harness [0032] 12 pre-separator [0033] 14 blow-by volume flow [0034] 16 pre-separation chamber [0035] 18, 20 charge-cycle valves [0036] 22 valve train-assembly [0037] a Valve train-assembly space [0038] b Web [0039] c Deflector plate [0040] d Calming space/installation space for the fuel rail [0041] e Drip edge [0042] f Splashboard [0043] g Separate pre-separation chamber [0044] h Passage for high pressure line [0045] i Drainage passage