DE102014006702B4 - Pressure control valve of a crankcase ventilation device and device for crankcase ventilation - Google Patents

Abstract

Pressure control valve (10) of a device for crankcase ventilation of an internal combustion engine, in particular a motor vehicle, comprising a valve housing (12) having at least one valve chamber (18) with at least one inlet (20), at least one outlet (26) and at least one fluidically between the at least an inlet (20) and at least one outlet (26) arranged, at least partially closable passage (22) for blow-by gas having at least one shut-off element (30) in a receiving portion (32) of the valve housing (12) for at least partially closing or opening the at least one passage (22) being movably arranged such that it tightly separates the at least one valve chamber (18) from a reference pressure area (46), the at least one shut-off element (30) being mounted on a reference pressure area (46 ) facing side can be acted upon by a reference pressure prevailing in the reference region (46) reference pressure and au f one of the at least one valve chamber (18) facing side can be acted upon in the at least one valve chamber (18) operating pressure and the at least one shut-off element (30) by means of a pressure difference between the operating pressure and the reference pressure is movable, characterized in that between the at least one shut-off element (30) and the receiving portion (32) at least one sealing device (38) is arranged, which on the movement of the at least one shut-off element (30) on the side of the at least one shut-off element (30) and / or on the sides of the receiving portion (32 ), wherein the sealing device (38) is formed from at least two respective annular sealing sections, each having a sealing lip, wherein the at least one sealing device (38) has at least one seal which at least partially circumferentially with respect to a valve axis (24 ), wherein at least e Ine first sealing lip of the first sealing portion of the sealing device (38) on the reference pressure region axially facing side obliquely to the reference pressure region (46) out, wherein at least a second sealing lip of the second seal portion obliquely to the valve chamber (18) points out.

Description

Technical area

The invention relates to a pressure control valve of a device for crankcase ventilation of an internal combustion engine, in particular of a motor vehicle, having a valve housing which at least partially arranged at least one valve chamber having at least one inlet, at least one outlet and at least one fluidically disposed between the at least one inlet and the at least one outlet includes closable passage for blow-by gas, with at least one shut-off element, which is arranged in a receiving portion of the valve housing for at least partially closing or opening the at least one passage movable so that it separates the at least one valve chamber from a reference pressure range, said at least one shut-off element can be acted upon on a side facing the reference pressure region with a reference pressure prevailing in the reference pressure region and on a side facing the at least one valve chamber e can be acted upon with an operating pressure prevailing in the at least one valve chamber and the at least one shut-off element can be moved by means of a pressure difference between the operating pressure and the reference pressure.

Furthermore, the invention relates to a device for crankcase ventilation of an internal combustion engine, in particular of a motor vehicle having at least one pressure control valve, with a valve housing having at least one valve chamber with at least one inlet, at least one outlet and at least one fluidically between the at least one inlet and the at least one Outlet disposed, at least partially closable passage for blow-by gas having at least one shut-off element, which is arranged in a receiving portion of the valve housing for at least partially closing or opening the at least one passage movable so that it is the at least one valve chamber of a reference pressure range dense separates, wherein the at least one shut-off element can be acted upon on a side facing the reference pressure region with a pressure prevailing in the reference pressure range reference pressure and on one of the at least one n valve chamber facing side can be acted upon by a prevailing in the at least one valve chamber operating pressure and the at least one shut-off element by means of a pressure difference between the operating pressure and the reference pressure is movable.

State of the art

The DE 10 2008 030 134 A1 shows a pressure control valve for the crankcase ventilation of an internal combustion engine having a vacuum-controlled side opening, a suction side opening, a flow chamber between the two openings, a biasing member-adjustable valve member for changing the flow resistance through the flow chamber and a cavity separated from the flow chamber, in which a movable separating element connected to the valve member is arranged, which separates the cavity into a control pressure chamber acted upon by the pressure on the vacuum-regulated side and a reference pressure chamber acted upon by a reference pressure.

Of the DE 10 2009 006 381 A1 is a pressure control valve for a crankcase ventilation of a reciprocating internal combustion engine and preferably a pressure control valve for installation in a leading from a crankcase to an air intake point of an engine vent line, by the so-called blow-by gases from the crankcase into the combustion chambers of the Motors are returned.

From the DE 10 2010 036 399 A1 is a valve for arrangement in a flow passage in which a fluid flows from a crankcase to an intake manifold of an internal combustion engine, known that a crankcase ventilation gas inlet conduit in fluid communication with the crankcase, and an outlet conduit in fluid communication with the intake manifold and at least a valve element serving as a closing element for an opening of the inlet conduit or the outlet conduit.

From the DE 20 2004 003 860 U1 a pressure regulating valve is known. The valve has a housing which is closed at the top with a lid. Between the housing and the lid, a control diaphragm is clamped, which divides the interior of the housing into a lower chamber and an upper chamber. The upper chamber is connected via a bore, with a matched cross-section, in the lid with the atmosphere. The lower chamber is connected to a gas inlet in the form of a lateral pipe socket. The gas inlet can be connected, for example, to a crankcase ventilation line of an associated internal combustion engine. Furthermore, the lower chamber is connected to a gas outlet, which also has the shape of a pipe socket. The gas outlet can be connected to the intake tract of an associated internal combustion engine, for example. Between a lower, the pipe socket surrounding area of the housing and the underside of the control diaphragm is a control spring, here in Shape of a helical compression spring arranged. This spring acts on the control diaphragm with a biasing force acting in the opening direction of the pressure control valve.

If there is a relatively low negative pressure in the lower chamber, the pressure regulating valve assumes its fully open position. In this state, the control diaphragm is held in its upper position by the control spring.

Due to a greater negative pressure in the lower chamber due to the pressure difference between the two chambers, the control diaphragm is pushed by a certain way down. The membrane deforms in this case, in particular in its radially outer edge region elastic-flexible, being held with its clamping edge sealing between the housing and lid.

If there is an even greater negative pressure in the lower chamber, the pressure regulating valve assumes its fully closed state. The control diaphragm must also deform elastically and flexibly in its central region until, with its underside, it also rests against a stop for completely closing off the outflow cross section.

It has been found that the diaphragm must deform strongly during the operation of the pressure regulating valve, in particular in its edge region, and is thereby forced. The cyclic movement of the membrane under the influence of temperature in conjunction with the aggressive blow-by gases from the crankcase can destroy the membrane. When switching the membrane creates a flexing movement, which can cause embrittlement and cracks at the radius of the membrane. In particular, cracks in the membrane can make the system leaky and the blow-by gases can escape to the atmosphere. This can lead to pollution of the environment. Furthermore, the pressure in the crankcase can not be regulated sufficiently well. The crankcase and / or seals can be damaged.

The invention has for its object to design a pressure control valve and a crankcase ventilation device of the type mentioned, in which wear and / or susceptibility, in particular the moving parts of the pressure control valve can be reduced.

Disclosure of the invention

This object is achieved in that between the at least one shut-off and the receiving portion at least one sealing device is arranged, which is freely movable on the movement of the at least one shut-off on the at least one shut-off element and / or on the sides of the receiving portion.

According to the invention, at least one sealing device is provided which can seal the region between the shut-off element and the receiving section. The at least one sealing device can improve the tightness of the separation between the reference pressure region and the valve chamber. The at least one sealing device is designed such that the at least one blocking element can move through the sealing device relative to the receiving section undisturbed. The at least one sealing device is loose at least on one side. That way she can move freely on this page. The at least one sealing device can thus compensate for movements, in particular lifting movement, of the at least one shut-off element relative to the receiving section. A flexing movement or bending movement of the at least one sealing device is not required in contrast to the pressure regulating valve known from the prior art.

The at least one sealing device can be arranged or attached to one of the components with limited mobility or immovable.

Advantageously, the at least one sealing device can have at least one sealing element which can slide and / or roll along with the movement of the at least one shut-off element, in particular on a sealing surface of one of the components. In this way, the wear of the at least one sealing device can be reduced. Neither the at least one shut-off element nor the at least one sealing device is exposed to serious deformations.

The sealing function between the at least one shut-off element and the receiving section and the blocking function for the at least one passage can be optimized separately from each other.

Advantageously, the at least one inlet can be connected to a crankcase of the internal combustion engine. The at least one outlet can advantageously lead to an intake tract, in particular to the clean side of the air intake path, for example into an air filter, of the internal combustion engine. With the pressure control valve, a pressure in the interior of the crankcase can be controlled, in particular regulated. With the pressure control valve, an optimal pressure inside the crankcase can be made possible. If it is provided to direct the blow-by gases into the intake tract, the pressure regulating valve may limit the negative pressure in the crankcase. This can be avoided at a To high vacuum in the crankcase arranged engine seals can be damaged.

When the passage is open, the blow-by gas can pass through the at least one inlet into the valve chamber and pressurize it with the corresponding operating pressure. Through the passage, the blow-by gas can escape from the valve chamber to the at least one outlet and from there out of the pressure control valve.

The at least one shut-off element is located between the reference pressure region and the valve chamber and separates these two regions from each other. In this case, the area between the at least one shut-off element and the receiving section is sealed according to the invention with the at least one sealing device.

Advantageously, the at least one shut-off element can move linearly in the direction of a valve axis. Alternatively, the at least one shut-off element can also perform other types of movements, in particular tilting movements.

As a result of the pressure difference which bears against sides of the at least one shut-off element which are functionally opposite with respect to the applied pressure forces, this is moved in the receiving section.

When decreasing the operating pressure, ie increase of a negative pressure in the valve chamber compared to the reference pressure, the at least one shut-off can be pulled in the direction of its closed position due to the pressure difference. The forces leading to the movement can be dependent on an area ratio of the at least one shut-off element on the reference pressure side and the operating pressure side and the difference of the applied pressures.

The at least one shut-off element can combine the function of an actuator and the blocking function for the at least one passage. Advantageously, the at least one shut-off element can have at least one actuator section on which the pressure forces can act. The at least one actuator section can fulfill an actuator function. Advantageously, the at least one shut-off element can have at least one blocking section. The at least one locking portion may be movably connected to the at least one actuator portion. The at least one blocking section can fulfill a blocking function for closing the at least one passage. Advantageously, the at least one actuator section and the at least one locking section can be integrally connected to one another.

By abutment of the at least one shut-off element, in particular of the at least one barrier section, on the at least one passage, a flow of the blow-by gas through the passage can be reduced, possibly interrupted. The flow from the crankcase to the intake area can thus be reduced or interrupted. The at least one shut-off element may, if necessary, move back into its starting position, in particular an opening position, when the pressure difference decreases, if necessary by means of a pretensioning element. In this way, a pressure in the crankcase can be maintained at a preferably constant value.

Advantageously, the at least one shut-off element, optionally at least one actuator section, can be preferably completely, dimensionally stable and / or rigid at least in a section facing the receiving section. In this way, an actuator function can be improved. In contrast to the membrane known from the prior art, the at least one shut-off element does not have to perform any flexing movements. Wear due to tearing or embrittlement can thus be reduced. The at least one shut-off element can be designed as a service life component.

Advantageously, the at least one valve chamber can be acted upon by the pressure of the crankcase. This may be a negative pressure or an overpressure compared to the reference pressure. The pressure control valve may thus be actuated depending on the pressure in the crankcase.

Advantageously, the pressure control valve can be designed so that it can be switched in particular discretely between an open position and a closed position.

Alternatively, the pressure control valve may be designed as a control / regulating valve, which can assume a plurality of, in particular continuous, opening positions between the complete opening position and the complete closing position.

Due to the separation of the actuator function and the sealing function, the pressure forces acting on the at least one sealing device can be reduced. In this way, the mechanical load of the at least one sealing device can be reduced. The pressure forces act exclusively on the at least one shut-off element, in particular the at least one actuator section. Thus, the at least one pressure control valve can still be switched even with minimal pressure differences, in particular with pressure differences on the order of a few millibars.

On the at least one sealing device act smaller compressions than is the case in the known from the prior art membrane. The material load can be reduced thereby. Thus, the aging can be reduced in the inventive at least one sealing device and their life and thus the service life of the pressure control valve can be extended.

Advantageously, oil entrained with the blow-by gas can exert a lubricating action. In this way, abrasion between the at least one sealing device and the adjacent sections of the at least one shut-off element and / or the receiving section can be reduced. Furthermore, a sealing effect can be improved with the entrained oil.

Advantageously, at least one barrier sealing device can be provided between the at least one blocking element, in particular the blocking section, and the at least one passage. The at least one barrier sealing device can advantageously be fixedly arranged on the side of the at least one shut-off element. Alternatively or additionally, at least one barrier sealing device can be arranged on the side of the at least one passage.

The at least one barrier sealing device can advantageously have at least one in particular elastic sealing element, in particular a sealing ring and / or a sealing disc.

The at least one sealing element of the at least one barrier sealing device can advantageously be molded onto the at least one blocking element or the at least one passage as a two-component component. Alternatively, the at least one sealing element may be connected as a separate component to the at least one blocking element or the at least one passage.

Advantageously, a housing cover of the valve housing by means of at least one housing seal, in particular a labyrinth seal and / or a sealing ring, be sealed against a housing pot of the valve housing. In this way, a dirt entry into the valve body can be reduced.

The invention is not limited to internal combustion engines of motor vehicles. Rather, it can also be used in other types of internal combustion engines, in particular industrial engines.

In an advantageous embodiment, the receiving portion may have a cylindrical with respect to a valve axis radially inner peripheral side, on which a radially outer peripheral side of the at least one shut-off element can be pushed along. In this way, the at least one shut-off element can easily be moved axially to the valve axis within the receiving portion.

Alternatively or additionally, advantageously, the radially outer peripheral side of the at least one shut-off element may be cylindrical. In this case, the radially inner peripheral side of the receiving portion may be cylindrical or otherwise.

Advantageously, the at least one sealing device can be located simply between the radially outer circumferential side of the at least one shut-off element and the radially inner peripheral side of the receiving section.

Advantageously, the at least one cylindrical peripheral side of the at least one shut-off element and / or the receiving section can be designed as a sealing surface. On the sealing surface, at least one seal, in particular at least one sealing lip, which slide or roll sealingly along at least one sealing device when moving the at least one shut-off element.

Additionally or alternatively, the radially outer peripheral side of the shut-off element may be cylindrical with respect to the valve axis. In this case, it is not necessary that the receiving portion is cylindrical at its radially inner peripheral side.

According to the invention, the at least one sealing device has at least one seal, in particular an annular seal, which can extend at least partially circumferentially with respect to a valve axis. In this way, by means of the at least one seal the area between the at least one shut-off element and the receiving portion can be sealed circumferentially.

Advantageously, at least one seal can be arranged on the radially outer peripheral side of the at least one shut-off element. The radially inner peripheral side of the receiving portion may be configured as a sealing surface.

Alternatively or additionally, at least one seal may be arranged on the radially inner circumferential side of the receiving portion. The sealing surface may in this case be located on the radially outer peripheral side of the at least one shut-off element.

Advantageously, the at least one seal can be arranged in at least one corresponding sealing groove of the at least one shut-off element or the receiving section. Advantageously, the at least one seal may be an O-ring seal.

Alternatively or additionally, at least one seal can be firmly connected to the at least one shut-off element or the receiving portion. The at least one seal can advantageously be injection molded as a two-component component on the at least one shut-off element or the receiving portion.

In a non-claimed embodiment, the at least one seal has at least one sealing lip. Depending on the configuration of the sealing device, the at least one sealing lip can be supported tightly on a radially outer peripheral side of the at least one shut-off element or on a radially inner circumferential side of the receiving section. The at least one sealing lip can expand under the influence of the applied differential pressure. It can set up and improve its sealing effect. The higher the applied differential pressure, the greater can be the sealing effect of the at least one sealing device. It is not necessary that the at least one sealing device performs a flexing movement, as is the case with the membrane known from the prior art. A risk of failure of the switching function and the sealing function can thus be reduced.

According to the invention, the at least one seal has at least two sealing lips. The sealing lips point in different, in particular with respect to the valve axis axial directions. Thus, for each direction of movement of the at least one shut-off element and / or each direction of the forces generated by the differential pressure in each case an optimal sealing effect can be generated.

Advantageously, the at least one sealing device can have more than one seal, in particular two seals. Advantageously, two ring seals may be provided. The ring seals may be arranged in corresponding separate sealing grooves. They can also be arranged in the same sealing groove. There may also be a seal contiguous with two or more sections which may be disposed in respective sealing grooves. Each seal may have one or more sealing lips.

In a further advantageous embodiment, at least one in particular elastic biasing element, in particular at least one spring element, can be provided, with which the at least one shut-off element can be held in an open position or brought back into it at least in the pressure-free state. With the at least one biasing element, the at least one shut-off element can be biased. In this way, the at least one shut-off element can be held in its open position as long as the operating pressure moves in a range relative to the reference pressure in which the pressure control valve should at least partially be opened.

Advantageously, the at least one biasing element can be elastic. In this way, the at least one shut-off element can be automatically pressed back into its open position when the pressure difference decreases from its closed position.

Advantageously, the at least one biasing element at least one spring element, in particular a coil spring, a coil spring and / or a leaf spring having.

Advantageously, the at least one spring element may comprise a compression spring and / or a tension spring and / or a different type of spring. Preferably, the at least one biasing element may comprise a helical compression spring.

The at least one biasing element, in particular the helical spring, can advantageously be coaxial with the valve axis. In this way, the at least one biasing element can act evenly on the at least one shut-off. The at least one biasing element may advantageously be supported with one side on the at least one shut-off element and with the other side on the sides of the valve housing.

Advantageously, the at least one biasing element can be arranged in the valve chamber. In this way, it can be flowed around by the blow-by gas. Thus, the at least one biasing element can be wetted with oil, which can be carried by the blow-by gas. The at least one biasing element may also be protected from the environment. The wear of the at least one biasing element can be reduced. His life can be increased.

In a further advantageous embodiment, at least one stop device can be provided between the at least one shut-off element and the valve housing, with which the at least one shut-off element can abut in at least one end position, in particular its opening position and / or its closing position.

When using at least one prestressed prestressed prestressing element, the at least one stopper device may advantageously be on the opposite side of the at least one pretensioning element Absperrelements be arranged. The at least one stop device may define an end position of the at least one shut-off element.

Advantageously, the at least one stop device can have at least one projection on the side of the valve housing. On the at least one projection, the at least one shut-off element can strike with a corresponding counter-stop.

In a further advantageous embodiment, the at least one stop device may comprise at least one stop damping element, with which an abutment of the at least one shut-off element can be damped. With the at least one stopper damping element, the shock can be damped. In this way, a noise can be reduced. In addition, a mechanical load can be reduced in particular when colliding the stop elements.

The at least one stopper damping element can advantageously be at least partially elastic. As a result, the damping can be improved. Furthermore, the at least one stopper damping element can serve as tolerance compensation. With the at least one stop damping element and operating vibrations and vibrations can be damped. Furthermore, a possible, in particular operational rattling when opening and / or closing the pressure control valve can be reduced or prevented.

The at least one stopper damping element can at least co-educate at least one stop element of the at least one stop device. In this way it is possible to dispense with the corresponding stop element.

The at least one stopper damping element can be combined with at least one housing seal between a housing cover and a housing pot. In this way, a component cost can be reduced. Furthermore, a mounting can be simplified.

The housing cover may be fastened by means of a latching connection to the housing pot or be connected in a different manner, in particular be welded, glued, riveted or screwed.

In a further advantageous embodiment, at least one guide device, in particular at least one guide element and at least one guide receptacle for the at least one guide element, may be provided for guiding the at least one shut-off element in the receiving section. In this way, the at least one shut-off element can be precisely guided during its movements in the receiving section.

Advantageously, the at least one guide device may comprise at least one guide element, in particular a guide dome and / or a guide pin and / or a guide cylinder and / or a guide rib and / or a guide arm, and at least one guide receptacle, in particular a guide sleeve, for receiving the at least one guide element ,

At least one guide element can advantageously be connected to the at least one shut-off element. At least one corresponding guide receptacle for the at least one guide element can advantageously be connected to the valve housing. Alternatively or additionally, at least one guide element can be connected to the valve housing and at least one corresponding guide receptacle can be connected to the at least one shut-off element.

The at least one guide device can be advantageously space-saving on the side facing away from the valve chamber of the at least one shut-off, in particular in a reference pressure chamber, or at least mitbilden. In this way, the at least one guide device can be arranged to save space in the valve housing.

Advantageously, the at least one guide device, in particular at least one guide element and / or the corresponding at least one guide receptacle, be coaxial with the valve axis. In this way a uniform guidance can be achieved. Furthermore, such a tilting of the at least one shutoff element can be prevented.

Advantageously, the at least one guide device can be functionally separated from the at least one sealing device. In a further advantageous embodiment, the valve housing may have at least one reference pressure chamber, which may define the reference pressure range. Within the at least one reference pressure chamber, the reference pressure prevail. Furthermore, the at least one reference pressure chamber and thus the reference pressure range can be arranged inside the valve housing to be protected from the environment. In this way, the at least one shut-off element can be protected from the environment.

In a further advantageous embodiment, the reference pressure range can be connected by printing technology to the environment. In this way The reference pressure range can be simply applied to the ambient pressure.

Advantageously, at least one breakthrough in a wall of the valve housing, in particular a valve cover, the reference pressure range, optionally connect the at least one reference pressure chamber, with the environment.

The object is further achieved by the device for crankcase ventilation, characterized in that between the at least one shut-off and the receiving portion at least one sealing device is arranged, which is freely movable on the movement of the at least one shut-off on the at least one shut-off element and / or on sides of the receiving portion ,

The advantages and features presented above in connection with the pressure control valve according to the invention and its advantageous embodiments apply correspondingly and vice versa for the crankcase ventilation device according to the invention and its advantageous embodiments.

Brief description of the drawings

Further advantages, features and details of the invention will become apparent from the following description in which appropriately marked embodiments of the invention and not embodiments of the invention will be explained in more detail with reference to the drawing. The person skilled in the art will expediently also individually consider the features disclosed in the drawing, the description and the claims in combination and combine these into meaningful further combinations.

It show schematically

1 a longitudinal section of a pressure control valve of a device for crankcase ventilation of an internal combustion engine according to a first embodiment;

2 a longitudinal section of a pressure control valve according to a second embodiment;

3 a detailed view of a shut-off of the pressure control valve from the 2 ;

4 a longitudinal section of a pressure control valve according to a third embodiment of the invention;

5 a shut-off of the pressure control valve from the 4 with guide ribs;

6 to 12 in each case a longitudinal section of a pressure control valve according to the invention (see 9 and 10 ) and non-inventive embodiments;

13 a detail view of a lid of a pressure control valve according to an eleventh embodiment.

In the figures, the same components are provided with the same reference numerals.

Embodiment (s)

In the 1 is a pressure control valve 10 a device for crankcase ventilation of an internal combustion engine of a motor vehicle according to a first embodiment shown in a longitudinal section. The pressure control valve 10 is arranged in an otherwise not shown vent line for crankcase ventilation. The vent line leads from the crankcase to the clean side of the air intake of the engine.

About the crankcase ventilation can Blow-by-gas, which can flow during operation of the internal combustion engine, in particular between the piston and cylinder bore in the crankcase, removed from the crankcase and the intake tract of the internal combustion engine are fed again. Blow-by gases may contain fuel residues, intermediates and end products of the combustion process, soot and water vapor. Furthermore, a significant proportion of the finest engine oil droplets can be contained, which are torn by the crankshaft or other rotating components from the oil reservoir of the oil pan.

The pressure control valve 10 The task is to ensure optimum pressure inside the crankcase. Furthermore, the pressure control valve limits 10 a possible negative pressure or overpressure in the crankcase.

The pressure control valve 10 includes a valve housing 12 with a housing pot 14 and a housing cover 16 ,

The valve housing 12 has a valve chamber 18 , which essentially in the housing pot 14 is arranged. In the valve chamber 18 leads an inlet 20 for the blow-by gas. In the valve chamber 18 is also a passage 22 arranged for the blow-by gas in the form of a pipe socket. The passage 22 is coaxial with a valve axis 24 of the valve housing 12 ,

In the following, the term "radial", "axial", "coaxial", "circumferential" or the like is mentioned is, so does this, unless otherwise stated, on the valve axis 24 ,

The passage 22 connects the valve chamber 18 with an outlet 26 of the valve housing 12 for the blow-by gas.

The inlet 20 is connected to a conduit part of the vent line, which comes from the crankcase. The outlet 26 is connected to a conduit part, which leads to the clean side of the air intake.

The passage 22 is with a lock section 28 a shut-off element 30 closable. The shut-off element 30 is dimensionally stable overall. In the 1 is the shut-off element 30 shown in its open position. The shut-off element 30 is coaxial in a receiving section 32 of the valve housing 12 arranged. In the present embodiment, the receiving portion 32 from a peripheral wall of the housing pot 14 educated. The shut-off element 30 is axial to the valve axis 24 to the passage 22 towards its closed position and from this away in its open position movable.

The shut-off element 30 has an actuator section 34 on, which is integral with the lock section 28 connected is. The actuator section 34 is on the passage 22 axially opposite side of the locking portion 28 , The diameter of the radially outer peripheral side of the actuator section 34 is greater than the diameter of the barrier section 28 , It is slightly smaller than the radially inner diameter of the receiving portion 32 , The recording section 32 and the radially outer peripheral side of the actuator section 34 are each cylindrical and coaxial with the valve axis 24 ,

The passage 22 facing side of the barrier section 28 is from the passage 22 viewed from convex. On his the passage 22 facing side, the lock section 28 an annular, coaxial sealing seal 36 on. The sealing seal 36 is elastic. It is as a two-component component to the lock section 28 molded. The diameter of the sealing seal 36 corresponds to the diameter of a free edge of the passage 22 , In the closed position of the shutoff element, not shown 30 lies the barrier seal 36 close to the free edge of the passage 22 and thus closes the passage 22 opposite the valve chamber 18 ,

At the radially outer peripheral side of the actuator section 34 is an annular, coaxial seal 38 arranged with a sealing lip. The seal 38 is a two-component component fixed to the radially outer peripheral side of the actuator 34 molded. The sealing lip is located on the radially outer peripheral side of the seal 38 , It shows from the valve chamber 18 diagonally away to the housing cover 16 , The sealing lip lies with its radially outer edge close to a sealing surface 40 at. The sealing surface 40 is on the radially inner peripheral side of the receiving portion 32 educated.

On his the valve chamber 18 opposite end face is the actuator section 34 provided with a recess. In the center of the depression is a guide element 42 in the form of a coaxial guide dome integral with the actuator section 34 connected. The guide element 42 extends axially from the actuator section 34 path. The guide element 42 is in a tubular, coaxial guide receptacle 44 guided. The guide shot 44 has the shape of a pipe piece and is integral with the inside of the housing cover 16 connected.

The housing cover 16 is designed cup-shaped. It contains a reference pressure chamber 46 of the pressure control valve 10 , The reference pressure chamber 46 is by means of the shut-off element 30 close to the valve chamber 18 separated. The reference pressure chamber 46 is about a breakthrough 48 through the wall of the housing cover 16 Fluidtechnisch and printing technology connected to the environment. The housing cover 16 is by means of a latching connection to the housing pot 14 attached. Between the housing pot 14 and the housing cover 16 is a labyrinthine housing seal 50 realized.

A peripheral wall of the housing cover 16 protrudes into the open side of the housing pot 14 , A free end edge of the peripheral wall of the housing cover 16 forms a cover-side stop 52 , The stop 52 is part of a stop device 54 between the shut-off element 30 and the valve housing 12 , One of the valve chamber 18 axially remote end edge of the actuator 34 forms an element-side stop 56 the stop device 54 ,

Between the cover-side stop 52 and the element-side stop 56 is an annular coaxial stopper damping element 58 arranged. The stopper damping element 58 is elastic. The stopper damping element 58 is as a two-component component at the end edge of the Aktuatorabschnitts 34 molded.

Between the shut-off element 30 and one the passage 22 radially outer surrounding coaxial support stage 60 of the housing pot 14 is an elastic biasing element 62 arranged in the form of a helical compression spring under a mechanical bias. The biasing element 62 is coaxial with the valve axis 24 , An inner diameter of the biasing element 62 is a bit bigger than one Outer diameter of the barrier section 28 , The biasing element 62 rests with one end on the lock section 28 radially outside surrounding end face of the shut-off element 30 and with the other end at the support level 60 from. With the preload element 62 becomes the shut-off element 30 held in its open position under the mechanical bias in the pressure-free state and against the cover-side stop 52 pressed. The stop device 54 defines an end position in the opening position of the shut-off element 30 ,

During operation of the internal combustion engine, blow-by gas may escape from the crankcase through the inlet 20 in the valve chamber 18 reach. The entrained in the blow-by gas oil particles, the sealing surface 40 and the seal 38 wet and thus improve the sealing effect. Furthermore, the oil may be the biasing element 62 wet and thus reduce wear. The seal 38 in cooperation with the sealing surface 40 prevents blow-by gas from the valve chamber 18 in the reference pressure chamber 46 and through the breakthrough 48 can get into the environment.

The blow-by gas can pass through the passage 22 and the outlet 26 the pressure control valve 10 leave and be supplied via the corresponding line part of the vent line to the intake of the engine.

The valve chamber 18 due to the line connection with the operating pressure of the crankcase is applied. In the reference pressure chamber 46 the ambient pressure, which serves as the reference pressure, prevails. When in the valve chamber 18 With respect to the reference pressure, a negative pressure prevails and the corresponding differential pressure is sufficiently large, the shut-off element 30 against the bias of the biasing member 62 axial to the valve axis 24 to the passage 22 moved. The displacement of the shutoff element 30 depends on the area ratios of the actuator section 34 on the side of the reference pressure chamber 46 and the valve chamber 18 , The corresponding mechanical displacement forces act essentially on the actuator section 34 , When moving the shut-off element 30 becomes the guiding element 42 within the leadership record 44 guided. The seal 38 slides on the sealing surface 40 along and thus seals the valve chamber 18 against the reference pressure chamber 46 continue down. Furthermore, by the negative pressure, the sealing lip to the valve chamber 18 set up. As a result, the sealing effect is improved with increasing pressure difference between the reference pressure and the operating pressure.

The lock section 28 abuts in the closed position of the pressure control valve 10 with the sealing seal 36 at the free edge of the passage 22 and closes this opposite the valve chamber 18 , A flow from the crankcase downstream to the intake tract of the internal combustion engine is in the closed position of the pressure control valve 10 interrupted.

Once the vacuum in the valve chamber 18 and so that the differential pressure decreases again, the shut-off 30 by means of the mechanical bias of the biasing element 62 brought back from its closed position to the open position. The blow-by gas can in the open position from the crankcase through the pressure control valve 10 get into the intake of the engine.

By the pressure-dependent opening and closing of the pressure control valve 10 the operating pressure in the crankcase is kept almost constant.

2 shows a pressure control valve 10 according to a second embodiment in its closed position. In contrast to the first embodiment, the sealing lip of the seal is in the second embodiment 38 obliquely to the valve chamber 18 directed towards. In addition, the pressure control valve has 10 from the 2 no biasing element 62 , In the 3 is the shut-off element 30 of the second embodiment with the seal 38 , the stopper damping element 58 and the barrier seal 36 shown in detail.

In the 4 is a pressure control valve 10 shown according to a third embodiment. In contrast to the first embodiment, the seal 38 of two annular sealing portions, each having a sealing lip. The sealing lip of the sealing portion of the gasket 38 on the reference pressure chamber 46 axially facing side is at an angle to the reference pressure chamber 46 out. The sealing lip of the other sealing portion is inclined to the valve chamber 18 out. The sealing sections are each located in a sealing groove 64 on the radially outer peripheral side of the actuator section 34 , In the embodiment of the 4 is the cover-side stop 52 with the stopper damping element 58 combined. The stopper damping element 58 is as a ring section with the inside of the housing cover 16 elastically connected. Finally, in the third embodiment, instead of the labyrinth-type housing seal 50 an O-ring seal between the housing pot 14 and the housing cover 16 intended.

Another embodiment of a shut-off 30 is in the detail without seal in the 5 shown. There are in 5 three guide elements 42 provided in the form of guide arms. The guide elements 42 each project radially outward and in the axial direction. The guide elements 42 are each in a corresponding, in the 4 not shown, guide receptacle of the housing cover 16 guided.

In the 6 is a fourth embodiment of the pressure control valve 10 shown. In contrast to the first embodiment, the seal 38 two sealing lips, which extend obliquely away from one another. The seal 38 can be referred to as X-seal. The seal 38 is in a sealing groove 64 in the radially outer peripheral side of the actuator section 34 arranged.

Furthermore, in the fourth embodiment, the stopper damping element 58 in one piece in combination with the housing seal 50 realized. As a cover-side stop 52 serves an inside of the front wall of the housing cover 16 ,

The guide element 42 is in the form of a coaxial cylinder wall integral with the housing cover 16 connected. An interior of the guide element 42 forms the reference pressure chamber 46 With.

The guide shot 44 is as a coaxial cylindrical inner circumferential surface on the side of the Aktuatorabschnitts 34 realized. It surrounds the guide element 42 radially outside.

Incidentally, the barrier seal 36 designed in the form of an O-ring seal. The sealing seal 36 is at the free edge of the passage 22 attached.

In 7 is a fifth embodiment of the pressure control valve 10 shown. In contrast to the fourth embodiment of the 6 is the barrier seal 36 similar to the first embodiment of the 1 on the side of the shutoff element 30 arranged.

In the 8th is a sixth embodiment of a pressure control valve 10 shown. In contrast to the fourth embodiment of the 6 Here is instead of an O-ring seal a flat ring seal as a sealing seal 36 intended. In the 9 is a seventh embodiment of the pressure control valve 10 shown. In contrast to the third embodiment of the 4 is the stopper damping element 58 integral with the housing seal 50 realized as a flat elastic ring disc. The guide element 42 and the guide shot 44 are similar to the embodiments four, five and six out of the 6 to 8th designed.

The sealing seal 36 is similar to the fourth embodiment of the 6 as O-ring seal on the side of the passage 22 realized.

In the 10 is an eighth embodiment of the pressure control valve 10 shown. In contrast to the third embodiment of the 4 is the guide element 42 as a coaxial guide dome on the sides of the housing cover 16 attached. The corresponding guide holder 44 in the form of a coaxial sleeve is located on the side of the shut-off element 30 ,

The stop device 54 is by means of the guide receptacle 44 and the guide dome 42 realized. The cover-side stop 52 is one the guiding element 42 circumferentially radially outwardly surrounding stage. The element-side stop 56 is through the free end edge of the guide 44 realized. The stopper damping element 58 is an elastic ring on the guide element 42 ,

Further, in the eighth embodiment, the lock portion 28 of the shutoff element 30 on his the passage 22 facing side just. There is the barrier seal 36 molded in the form of a flat planar seal as a two-component component.

In addition, the receiving section 32 for the shut-off element 30 integral with the housing cover 16 realized.

In 11 is a ninth embodiment of the pressure control valve 10 shown. In contrast to the eighth embodiment of the 10 is in the ninth embodiment to a separate stop device 54 waived.

The seal 38 is similar to the second embodiment of the 2 equipped with a sealing lip.

In contrast to the second embodiment of the 2 is the seal 38 in a sealing groove 64 on the radially outer peripheral side of the actuator section 34 of the shutoff element 30 , The sealing lip of the seal 38 shows obliquely to the valve chamber 18 ,

In the 12 is a tenth embodiment of the pressure control valve 10 shown. An elastic element 66 realizes the housing seal 50 , the stopper damping element 58 and an additional inner guide sealing lip 68 , The elastic element 66 is in the reference pressure chamber 46 arranged.

The guide sealing lip 68 seals against the sleeve-like guide element 42 off, which with the shut-off 30 connected is. The guide sealing lip 68 also forms the guide 44 for the guide element 42 ,

In the 13 is the housing cover 16 an otherwise not shown pressure control valve according to an eleventh embodiment shown. The housing cover 16 shows the breakthrough 48 through a peripheral wall.

Claims (9)

Pressure control valve ( 10 ) a device for crankcase ventilation of an internal combustion engine, in particular of a motor vehicle, with a valve housing ( 12 ), the at least one valve chamber ( 18 ) with at least one inlet ( 20 ), at least one outlet ( 26 ) and at least one fluidically between the at least one inlet ( 20 ) and the at least one outlet ( 26 ), at least partially closable passage ( 22 ) for blow-by gas, with at least one shut-off element ( 30 ) stored in a receiving section ( 32 ) of the valve housing ( 12 ) for at least partially closing or opening the at least one passage ( 22 ) is arranged so that it is the at least one valve chamber ( 18 ) from a reference pressure range ( 46 ), wherein the at least one shut-off element ( 30 ) on a reference pressure range ( 46 ) facing side in the reference pressure range ( 46 ) can be acted upon reference pressure and on one of the at least one valve chamber ( 18 ) facing side with a in the at least one valve chamber ( 18 ) can be acted upon by the prevailing operating pressure and the at least one shut-off element ( 30 ) is movable by means of a pressure difference between the operating pressure and the reference pressure, characterized in that between the at least one shut-off ( 30 ) and the receiving section ( 32 ) at least one sealing device ( 38 ) is arranged, which during the movement of the at least one shut-off element ( 30 ) on the side of the at least one shut-off element ( 30 ) and / or on the side of the receiving section ( 32 ) is freely movable, wherein the sealing device ( 38 ) is formed from at least two respectively annular sealing portions, each having a sealing lip, wherein the at least one sealing device ( 38 ) has at least one seal, which at least partially circumferentially with respect to a valve axis ( 24 ), wherein at least a first sealing lip of the first sealing portion of the sealing device ( 38 ) on the reference pressure range axially facing side obliquely to the reference pressure range ( 46 ), wherein at least a second sealing lip of the second sealing portion obliquely to the valve chamber ( 18 ) shows. Pressure control valve according to claim 1, characterized in that the receiving portion ( 32 ) a cylindrical with respect to a valve axis ( 24 ) radially inner peripheral side ( 40 ), on which a radially outer peripheral side of the at least one shut-off element ( 30 ) can be pushed along. Pressure control valve according to one of the preceding claims, characterized in that at least one in particular elastic biasing element ( 62 ), in particular at least one spring element is provided, with which the at least one shut-off element ( 30 ) can be held in an open position at least in the pressure-free state or brought back into this. Pressure control valve according to one of the preceding claims, characterized in that at least one stop device ( 54 ) between the at least one shut-off element ( 30 ) and the valve housing ( 12 ) is provided, with which the at least one shut-off ( 30 ) can strike in at least one end position, in particular its opening position and / or its closed position. Pressure control valve according to claim 4, characterized in that the at least one stop device ( 54 ) at least one stop damping element ( 58 ), with which an abutment of the at least one shut-off element ( 30 ) can be damped. Pressure control valve according to one of the preceding claims, characterized in that at least one guide device, in particular at least one guide element ( 42 ) and at least one guide receptacle ( 44 ) for the at least one guide element ( 42 ), is provided for guiding the at least one shut-off element ( 30 ) in the receiving section ( 32 ). Pressure control valve according to one of the preceding claims, characterized in that the valve housing ( 12 ) at least one reference pressure chamber ( 46 ) defining the reference pressure range. Pressure control valve according to one of the preceding claims, characterized in that the reference pressure range ( 46 ) is connected by printing with the environment. Device for crankcase ventilation of an internal combustion engine, in particular of a motor vehicle, which has at least one pressure control valve ( 10 ), with a valve housing ( 12 ), the at least one valve chamber ( 18 ) with at least one inlet ( 20 ), at least one outlet ( 26 ) and at least one fluidically between the at least one inlet ( 20 ) and the at least one outlet ( 26 ), at least partially closable passage ( 22 ) for blow-by gas, with at least one shut-off element ( 30 ) stored in a receiving section ( 32 ) of the valve housing ( 12 ) for at least partially closing or opening the at least one passage ( 22 ) is arranged so that it is the at least one valve chamber ( 18 ) from a reference pressure range ( 46 ), wherein the at least one shut-off element ( 30 ) on a reference pressure range ( 46 ) facing side in the reference pressure range ( 46 ) can be acted upon reference pressure and on one of the at least one valve chamber ( 18 ) facing side with a in the at least one valve chamber ( 18 ) can be acted upon by the prevailing operating pressure and the at least one shut-off element ( 30 ) is movable by means of a pressure difference between the operating pressure and the reference pressure, characterized in that between the at least one shut-off ( 30 ) and the receiving section ( 32 ) at least one sealing device ( 38 ) is arranged, which during the movement of the at least one shut-off element ( 30 ) on the side of the at least one shut-off element ( 30 ) and / or on the side of the receiving section ( 32 ) is freely movable, wherein the at least one sealing device ( 38 ) has at least one seal, which at least partially circumferentially with respect to a valve axis ( 24 ), wherein the sealing device ( 38 ) is formed from at least two respective annular sealing portions, each having a sealing lip, wherein at least a first sealing lip of the first sealing portion of the sealing device ( 38 ) on the reference pressure range axially facing side obliquely to the reference pressure range ( 46 ), wherein at least a second sealing lip of the second sealing portion obliquely to the valve chamber ( 18 ) shows.

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