DE102004014693A1 - Pressure control valve for an internal combustion engine - Google Patents

Abstract

The The invention relates to a pressure regulating valve for an internal combustion engine, wherein the pressure regulating valve disposed within a cylinder head cover is and at least one recess for receiving oil particles has, of this recess via an oil return passage in a below the Crankshaft arranged oil pan stream can. It will solve the task to make such a pressure control valve such that even with inclined Installation position of the internal combustion engine in the region of the pressure control valve oil particles collected and continuously recycled can. This is achieved by the recess (3) a trough-shaped, after has open top contour, the, from its upper inlet cross-section (31) proceeding, increasingly inclined downwards and at its lower outlet cross-section (32) with an oil return passage is in active connection.

Description

The The invention relates to a pressure regulating valve for an internal combustion engine, wherein the pressure regulating valve disposed within a cylinder head cover is and at least one recess for receiving oil particles having, from this recess via an oil return passage in a below the crank chamber arranged oil pan stream can.

For the business an internal combustion engine is mandatory in addition to the actual fuel Engine oil necessary. However, it is objectively not possible to use this oil only to supply such bodies where it should be functional. Both leaks on component pairings as well as operationally misted or vaporous oil cause an admission of assemblies, for their functionality a contact with oil is not necessary or even disadvantageous per se. To avoid of malfunctions are therefore additional constructive measures necessary.

This for example, refers to the blow-by gases referred to as "blow-by" in the crankcase, coming out of the combustion chamber over the area between the piston or the piston rings and the cylinder wall flow into the crankcase. in the Crankcase, the blow-by gases mix with engine oil, this one in the form of oil mist is available. The vent of the crankcase becomes due to emission, consumption and legal aspects realized with closed systems by the blow-by gases the Intake system of the internal combustion engine are supplied. To an oil entry In the intake system to avoid the crankcase breather oil separator assigned.

A related technical solution is the subject of DE 195 08 967 C2 , Here, an internal combustion engine is described with V-shaped rows of cylinders, in which the blow-by gases from the crankcase via a vent line to the intake manifold can be fed. In the upper region of the internal combustion engine, an oil separator is provided in the free space between the two rows of cylinders arranged in a V-shape, which deposits the oil particles entrained in the blow-by gas. The thus cleaned of oil particles air is supplied to the intake tract of the internal combustion engine. The separated oil particles are first passed through an oil return line in the crankcase in an oil bag before they overflow into a, arranged at the bottom of the crankcase oil pan.

The ventilation system for a crankcase according to DE 40 33 844 C2 is also provided for an internal combustion engine with two V-shaped rows of cylinders. In this case, a pump effect achieved by the movement of the pistons is used to forcibly convey fresh air into the crank chamber. The fresh air displaces the blow-by gases through a chamber into two oil separators, which are formed on the inside of each cylinder head cover and integrally with this. While the now oil-free air is supplied to the intake tract of the internal combustion engine after flowing through the oil separator, a recess is provided as a collecting container for the separated oil. Due to the arrangement of this recess on the inside of the respective outer wall of the V-shaped inclined cylinder heads, in addition to the components separated from the blow-by gas, other oil particles can in principle also flow from the upper surface of the cylinder heads. The oil passes from the recess via the oil return channel in an arranged below the crankcase oil pan.

Another venting device for a crankcase is made DE 197 15 061 A1 known, this design is designed especially for an inclined mounting position of internal combustion engines with cylinders arranged in series. Here, the oil separator, which is integrated in the cylinder head cover, extending in the direction of the engine longitudinal axis from the oil inlet to the oil outlet first slope and extending in the direction of a motor transverse axis second slope. Consequently, despite the inclined mounting position of the internal combustion engine ensures that the oil separated in the oil separator only passes into the oil outlet to the oil pan at the lower portion of the crankcase, but not in the intake.

The oil separator the venting device is but not the only assembly from which oil should be taken away. Especially in an inclined mounting position of the internal combustion engine can related problems in the area of the crankcase pressure regulator result. The corresponding pressure control valve is predominantly within the cylinder head cover arranged and has oil pockets on which are oil particles can collect. As soon as exceeded a certain level will, the oil overflows and can in the flow path get the intake air. It is the same as a result of the admission possible with negative pressure, that the oil already before overflowing bubbly from the oil bag is torn and thus also enters the flow path of the intake air. Consequently, the function of the pressure regulating valve and ultimately the emission and performance of the entire internal combustion engine affected. To avoid such disadvantages to a large extent, is a continuous Return of oil particles from the field of pressure control valve appropriate. However, they are named References to the prior art are not suitable for this purpose.

task The invention is a pressure control valve for internal combustion engines so to design that even with inclined installation position of the internal combustion engine collected in the area of the pressure control valve oil particles and continuously to be led back can.

These Task is solved in that a recess is formed on the pressure control valve, which is a trough-shaped, has upwardly open contour, from its upper inlet cross-section starting increasingly inclined downwards and at the bottom Outlet cross section with an oil return channel is in active connection. Further embodiments are the subject the dependent claims whose Technical features and functions described in detail in the embodiment become.

The Pressure control valve according to the invention is for Internal combustion engines of different types suitable, the preferred application is an inclined mounting position. By the one Drain ramp similar Design of the trough-shaped Recess are in any operating condition oil particles in the region of the pressure control valve collected and continuously returned from this area, so that a transfer of oil in the flow path the intake air is avoided. As a result, the functionality becomes the pressure control valve ensures and thus the emission and performance of the internal combustion engine improved with little construction effort.

following is an embodiment of Invention described with reference to the drawing. Show it:

1 a section of the upper region of an internal combustion engine in an inclined installation position with inventive design in the region of the pressure control valve

2 in detail the embodiment of a pressure control valve according to 1 in perspective view

3 this in 2 illustrated detail of a pressure control valve in plan view

In 1 a section of the upper region of an internal combustion engine is shown, which has an inclined mounting position. In this area is a cylinder head cover 1 provided, in whose interior, inter alia, a pressure control valve 2 is arranged. In the area of the pressure control valve 2 is at least one recess 3 designed for receiving oil particles. The maximum available memory space 4 for the oil is in 1 hatched shown.

The recess 3 has a trough-shaped and upwardly open contour. This contour of the recess 3 runs - like out 2 apparent - starting from the upper inlet cross-section 31 increasingly inclined downwards in the direction of a lower outlet cross-section 32 , The flow direction of the oil is in 3 Stylized with an arrow. In the area of the outlet cross-section 32 is the trough-shaped recess 3 with an oil return channel in operative connection. The specific design of this oil return channel is largely irrelevant in the present situation. It is only essential that in the recess 3 collected oil particles can flow through the oil return passage in an arranged below the crankcase oil pan, oil return passage and oil pan are not shown in detail in the drawing.

Between the upper inlet cross section 31 and the lower outlet section 32 the trough-shaped recess 3 results in an inclination angle "α". This inclination angle "α" should be greater than the angle "β", with which the internal combustion engine is inclined relative to the vertical "L". This ensures that no oil from the area of the pressure control valve 2 can flow into the intake.

The trough-shaped recess 3 may vary based on the suction pipe connection to the pressure control valve. Preferably, a circular arc-shaped course with an arc length of approximately 90 ° between the upper inlet cross-section 31 and lower outlet cross-section 32 , see also 2 and 3 ,

Furthermore, it is suggested that the two side surfaces 33 and 34 the trough-shaped recess 3 have different distances to each other at their upper edges and lower edges. Consequently, the side surfaces run 33 and 34 obliquely to each other, wherein the distance "o" between the upper edges is greater than the distance "u" between the lower edges. This embodiment improves the flow behavior of the oil particles.

In a further embodiment, it is provided that the two side surfaces 33 and 34 the trough-shaped recess 3 have different heights "x" and "y". Consequently, results in the lower closed surface of the trough-shaped recess 3 an additional slope in cross section, which further improves the flow behavior of the oil particles. Depending on the particular dimensioning of heights "x" of Sei tenfläche 33 and "y" of side surface 34 this inclination runs either from the pressure regulating valve 2 side facing away from the pressure control valve 2 facing side or of the pressure regulating valve 2 facing side to the pressure control valve 2 opposite side. In the drawing, the former variant is shown.

Preferably, the housing from the pressure control valve 2 and the associated trough-shaped recess 3 uniform material in the cylinder head cover 1 integrated, so that this entire assembly can be cast in the manufacturing process as a common component of, for example, aluminum. Such an embodiment is shown in the drawing. However, it is also possible that the pressure control valve 2 with the associated trough-shaped recess 3 initially manufactured as a separate module and subsequently in the free space within the cylinder head cover 1 is mounted.

1

Cylinder head cover

2

Pressure control valve

3

trough-shaped recess

31

Inlet cross-section (above)

32

Outlet cross section (below)

33

Side surface (inside)

34

Side surface (outside)

4

storage space for oil

α

tilt angle the trough-shaped recess

β

tilt angle Installation position of the internal combustion engine

L

vertical

O

distance between the side surfaces (above)

u

distance between the side surfaces (below)

x

Height of the side surface (inside)

y

Height of the side surface (outside)

Claims (10)

Pressure control valve for an internal combustion engine, wherein the pressure regulating valve is arranged within a cylinder head cover and has at least one recess for receiving oil particles, which can flow from this recess via an oil return passage in an arranged below the crankcase oil pan, characterized in that the recess ( 3 ) has a trough-shaped, upwardly open contour, from its upper inlet cross-section ( 31 ) starting increasingly inclined downwards and at its lower outlet cross-section ( 32 ) is in operative connection with an oil return channel. Pressure control valve according to claim 1, characterized in that between the upper inlet cross-section ( 31 ) and the lower outlet cross-section ( 32 ) resulting inclination angle (α) of the trough-shaped recess ( 3 ) is greater than the angle (β), with which the internal combustion engine with respect to the vertical (L) is inclined. Pressure control valve according to claim 1, characterized in that the trough-shaped recess ( 3 ) runs in a circular arc. Pressure control valve according to claims 1 and 3, characterized in that the trough-shaped recess ( 3 ) an arc length of approximately 90 ° between the upper inlet cross section ( 31 ) and the lower outlet cross-section ( 32 ) having. Pressure control valve according to claim 1, characterized in that the two side surfaces ( 33 ; 34 ) of the trough-shaped recess ( 3 ) have at their upper edges a greater distance (o) than the distance (u) at their lower edges. Pressure control valve according to claim 1, characterized in that the two side surfaces ( 33 ; 34 ) of the trough-shaped recess ( 3 ) have different heights (x; y). Pressure control valve according to claims 1 and 6, characterized in that the lower closed surface of the trough-shaped recess ( 3 ) has an inclination in cross section, that of the pressure regulating valve ( 2 ) facing away from the side surface ( 34 ) to the pressure regulating valve ( 2 ) facing side surface ( 33 ) runs. Pressure control valve according to claims 1 and 6, characterized in that the lower closed surface of the trough-shaped recess ( 3 ) has an inclination in cross section, that of the pressure regulating valve ( 2 ) facing side surface ( 33 ) to the pressure regulating valve ( 2 ) facing away from the side surface ( 34 ) runs. Pressure control valve according to claim 1, characterized in that the housing from the pressure control valve ( 2 ) and the associated trough-shaped recess ( 3 ) in the same way as the cylinder head cover ( 1 ) are integrated. Pressure control valve according to claim 1, characterized in that the housing from the pressure control valve ( 2 ) with the associated trough-shaped recess ( 3 ) designed as a separate module and in the free space within the cylinder head cover ( 1 ) is mounted.