EP3276133B1 - Impactor assembly - Google Patents

Description

The present invention relates to an impactor arrangement for separating liquid and solid aerosol particles from an aerosol, preferably a crankcase breather of an internal combustion engine. The invention also relates to a separation device for separating liquid and / or solid contaminants from a gas flow and a cylinder head cover for an internal combustion engine, wherein the separation device or the cylinder head cover is equipped with such Impaktoranordnung.
Such an impactor assembly includes an impactor for separating the aerosol particles from the aerosol and a console having the impactor. Such a console may be formed for example in a cylinder head cover by a wall portion which separates an inflow space for blow-by gas from a discharge space for blow-by gas, wherein the blow-by gas passes from the inflow space through the impactor to the outflow space. As a result, the content of aerosol particles in the aerosol can be significantly reduced on the downstream side EP 1 924 335 B1 describes an Impaktoranordnung according to the preamble of claim 1. The cost of implementing such an impactor on such a console can be relatively expensive. Depending on the degree of integration of the impactor into the console, maintenance, in particular repair, of the impactor can also be complicated.
The present invention is concerned with the problem of providing an improved embodiment for an impactor assembly of the type described above or for a separator or cylinder head cover equipped therewith specify, which is characterized in particular by a simplified assembly and / or disassembly.

This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.

The invention is based on the general idea to form a bayonet between the impactor and the console. This makes it particularly easy to mount the impactor on the console and also disassemble it again, which simplifies maintenance and in particular replacement of the impactor. Suitably, the impactor or the bayonet closure is also designed to be sealing, which can preferably be realized with a seal provided on the impactor, which cooperates sealingly in the assembled state with the console.

Such a bayonet lock is characterized in that the connection partners, here the impactor on the one hand and the console on the other hand, must perform two different adjustment movements to be transferred from an unsecured state to a fixed state. As a rule, this involves the combination of an axial adjustment and an adjoining rotary adjustment, which can optionally be accompanied by a further axial adjustment. In contrast to a screw connection, the rotary adjustment is usually carried out with a bayonet closure over less than 360 °, for example over a maximum of 180 °. Thus, such a bayonet lock can be handled easily and quickly.

According to an advantageous embodiment, the impactor has a base body and a baffle wall. The main body can be hollow cylindrical and a holding portion and a nozzle portion. The console may have a console opening through which a flow path for a gas flow is passed. The gas flow is the aerosol whose load of aerosol particles is to be reduced by the impactor. The holding portion of the body is inserted into this console opening and secured to the console. The nozzle portion is, however, arranged outside the console opening and equipped with a plurality of radial outlet openings for the gas flow. The baffle can be advantageously designed as a hollow cylinder and be arranged coaxially to the base outside of the nozzle section. As a result, a gas flow emerging from the outlet openings can strike the baffle wall. This leads to a flow deflection, which causes an inertial separation.

The holding portion of the main body may have an axial inlet opening for the gas flow and on its outer side a circumferential, cooperating with the console seal. The bayonet closure is expediently formed on the side of the impactor on the base body, in particular on the retaining portion. As a result, the impactor arrangement has a structure that is particularly easy to implement.

According to an advantageous embodiment, the bayonet lock on the holding portion may have at least one in the outside of the holding portion recessed slide guide. In addition, the bayonet lock on an enclosure enclosing the console opening may have a guide element protruding from an inner side of the enclosure, which engages radially in the sliding guide and is guided in a guided manner along the slide guide. Suitably, rotationally symmetrical at least two such slide guides and guide elements in the circumferential direction symmetrically distributed on the holding portion or on the enclosure are provided.

Advantageously, the slide guide on an axial end face of the holding portion containing the inlet opening have an axially open insertion end for axial insertion of the guide element in the slotted guide. Accordingly, when mounting the impactor, the bayonet lock initially requires an axial adjustment movement relative to the bracket in order to be able to insert the respective guide element through the inlet opening into the associated slide guide.

In another embodiment, the slotted guide distal to a axial end face of the holding portion containing the inlet opening may have a stop end which forms a stop in the circumferential direction for the guide element. This makes it clear that a rotational movement must take place between the impactor and the link in order to adjust the respective guide element along the associated slotted guide to the stop end. Thus, the present bayonet closure requires a rotational movement between impactor and console to come to the Drehlagenanschlag when mounting the impactor. Suitably, the two above embodiments are combined with each other, so that the axial adjustment movement is present at the beginning of the assembly, while the rotating adjustment movement leads to the end of the assembly process.

In another embodiment, the slotted guide may define a circumferentially extending guideway leading from a proximal insertion end to an axial end face of the holding portion containing the entrance opening to a stop end distal to the end face of the holding portion. In other words, the guideway extends from the insertion end to the stop end on the one hand in the circumferential direction and on the other hand axially, so helically. This can basically be done with a constant Gradient done. However, an embodiment in which the helical guideway has a varying pitch is preferred. As a result, the assembly process can be significantly improved. For example, an associated with the rotational movement axial feed can be varied, which influences the associated axial feed forces at constant torque accordingly.

Advantageously, a development in which the slope of the guideway decreases toward the stop end at least in an end region having the stop end. As a result, the axial feed decreases at least in this end region, while the axial feed forces increase at constant torque.

In another embodiment may be formed between the holding portion and the console, a latch which ensures a predetermined rotational position between the impactor and console against rotation. In this way, the risk that the bayonet lock, for example, due to vibration and vibration, automatically dissolves, can be significantly reduced.

In a further development, the catch can be matched to the bayonet lock that it locks when screwing the holding portion in the console opening upon reaching the predetermined rotational position of the impactor and secures the impactor in this rotational position against rotation. It can be provided that in order to achieve the latched state, an axial counterforce of the latching has to be overcome in order to bring about locking the locking position. In this connection, the above-mentioned varying slope of the guideway may be advantageous.

In another embodiment, the latching on the holding portion may comprise at least one radially projecting, axially resilient latching arm which has a detent axially projecting therefrom. Furthermore, the latching on the console can have a detent-complementary notch into which the detent engages axially in the predetermined rotational position of the impactor. This creates an easily realizable, efficient locking.

In an expedient development can be provided that the guide element is spaced in the predetermined rotational position of the impactor from the abutment end in the circumferential direction. Thus, not the stop end defines the predetermined rotational position, but the locking, which simplifies the production. The abutment end only prevents over-rotation of the impactor relative to the console.

In another embodiment, the base body in the nozzle portion having a concentrically arranged guide sleeve in which a valve member of a valve is mounted axially adjustable. This valve member may comprise a valve disk, which cooperates with an axial valve seat of the valve formed on the nozzle portion. This valve seat runs along one of the inlet opening axially opposite the axial opening of the nozzle section. The valve plate can now, when it lifts axially from the valve seat, release an annular additional radial outlet opening, which is axially bounded on the one hand by the valve seat and axially on the other hand by the valve disk. The valve opens from a predetermined differential pressure between an inflow region and an outflow region. Below this differential pressure, the entire gas flow is forced to exit through the formed in the shell of the nozzle portion radial outlet openings. In this way, high flow rates are realized there. However, if the predetermined differential pressure is exceeded, the valve opens to relieve and releases the further, annular outlet opening whose Opening cross-section in the axial direction also depends on the stroke of the valve member. Suitably, the baffle can extend axially into the region of this at least one additional radial outlet opening, so that the gas flow emerging from this additional outlet opening likewise strikes the baffle wall. Thus, even in the event that the valve opens, the gas flow exiting the additional outlet opening of aerosol particles are at least partially freed.

Expediently, an annular gap can be formed radially between the annular additional outlet opening and the baffle wall, which is axially closed on an axial side facing the bracket and which is axially open on an axial side remote from the bracket. As a result, the gas flow radially emerging from the annular axial opening is deflected axially on the baffle wall, so that it flows axially out of the impactor through the gap.

In the case of an extreme opening stroke of the valve member, the valve disk can also move axially beyond an end face of the baffle wall facing away from the bracket, so that the gas flow can flow radially out of the impactor in this area without colliding with the baffle wall. For this purpose, however, an extremely high differential pressure is required, in which the pressure reduction is more important for the relief of the crankcase as the deposition of the aerosol particles.

In an advantageous development, a plurality of circumferentially distributed axial guide webs may be arranged in the region of the gap, on which the valve disk is guided for its axial adjustment. These guide webs may extend beyond the front end of the baffle wall facing away from the bracket.

In another advantageous embodiment, an axial annular gap can be formed axially between the baffle wall and a peripheral collar radially projecting from the holding region and radially overlapping the bracket opening. Radially between the baffle wall and an outer side of the nozzle portion containing the outlet openings, an annular space can be formed, which is axially open to the annular gap on an axial side facing the bracket and which is axially closed on an axial side remote from the bracket. As a result, the gas flow emerging from the outlet openings on the baffle wall can be deflected axially relative to the annular gap and deflected radially outwards on the collar. Finally, the gas flow through the annular gap can flow radially out of the impactor.

In particular, different outflow paths for the gas flow can thus be realized, depending on whether the differential pressure between inflow region and outflow region is below or above the predetermined limit pressure. Below the predetermined limit pressure, the gas flow flows radially out of the impactor exclusively through the annular gap. Above the predetermined limit pressure, the gas flow additionally flows axially out of the impactor through the aforementioned annular gap.

The baffle is preferably formed of a nonwoven material so that it can capture and remove the aerosol particles.

The radial outlet openings provided along the cylindrical jacket of the nozzle section can be designed as nozzle openings. Such a nozzle opening is characterized in that its length is at least twice as large as its diameter, the length being measured parallel to the flow direction of the nozzle opening, while the diameter is measured transversely to the direction of flow. This can be done on the outside of the Mantels pipe sections protrude outward, each containing such an outlet opening.

In another advantageous embodiment, a radially projecting, circumferentially encircling, an edge region of the console opening radially overlapping collar may be formed on the holding portion having a plurality of circumferentially distributed, projecting axially from the collar contact zones. Appropriately, it is now provided that the collar is axially directly supported only on these contact zones in the edge region of the console. As a result, a predetermined axial relative position between impactor and console is defined. As a result, the bayonet lock can be manufactured with a comparatively large tolerance, since the optimal alignment between impactor and console is effected by these contact zones. The possibly predetermined rotational position between impactor and console is ensured as explained above by the optional locking.

According to an advantageous embodiment, the bayonet closure and the contact zones can be coordinated with each other so that the contact zones axially biased rest against the console. Again, it may be appropriate to vary the slope of the guideway.

A cylinder head cover according to the invention, which is provided for an internal combustion engine, has a wall section which separates an inflow region for blow-by gas from a blow-by section outflow region. Furthermore, the cylinder head cover is equipped with at least one impactor arrangement of the type described above. The console of the respective impactor arrangement forms a part of the wall section of the cylinder head cover. Thus, the inflow region and outflow region of the cylinder head cover are through the console opening fluidly interconnected through, wherein the particle loading of the aerosol is reduced in the flow through the impactor.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

Fig. 1

eine isometrische Ansicht einer Impaktoranordnung mit transparent dargestellter Konsole,

Fig. 2

eine Seitenansicht der Impaktoranordnung entsprechend einer Blickrichtung II in Fig. 1,

Fig. 3

einen Längsschnitt der Impaktoranordnung,

Fig. 4

einen Längsschnitt wie in Fig. 3, jedoch in einer anderen Schnittebene,

Fig. 5

einen Querschnitt der Impaktoranordnung entsprechend Schnittlinien V in Fig. 4,

Fig. 6

eine Ansicht von oben auf die Impaktoranordnung,

Fig. 7

eine Ansicht von unten auf die Impaktoranordnung.

Show, in each case schematically,

Fig. 1

an isometric view of an impactor assembly with transparently displayed console,

Fig. 2

a side view of the impactor assembly according to a line of sight II in Fig. 1 .

Fig. 3

a longitudinal section of the impactor arrangement,

Fig. 4

a longitudinal section as in Fig. 3 but in another cutting plane,

Fig. 5

a cross section of the impactor arrangement according to section lines V in Fig. 4 .

Fig. 6

a view from above of the impactor arrangement,

Fig. 7

a bottom view of the impactor assembly.

According to the Fig. 1 to 7 includes an Impaktoranordnung 1, which serves for the separation of liquid and solid aerosol particles from an aerosol, a console 2 and an impactor 3. The console 2 may be part of a cylinder head cover, not shown here, for example, a wall portion which in the cylinder head cover an inflow region for Blow-by gas separates from a discharge area for blow-by gas. The blow-by gas is an aerosol. The aerosol particles are oil droplets entrained in the blow-by gas as well as soot particles contained in the oil. The console 2 includes a console opening 4, through which a flow path for a gas flow is passed. The gas flow is the aerosol whose charge of aerosol particles is reduced during the flow through the impactor 3.

Accordingly, the impactor 3 is provided for separating the aerosol particles from the aerosol. For this purpose, the impactor 3 has a main body 5 and a baffle 6. The main body 5 is hollow cylindrical and has a holding section 7 and a nozzle section 8. The holding portion 7 is inserted into the console opening 4 and is fixed to the console 2. The nozzle section 8 is arranged outside the console opening 4 and has a plurality of radial outlet openings 10 for the gas flow in a cylindrical jacket 9. The baffle 6 is hollow cylindrical and arranged coaxially to the base body 5 on the outside of the nozzle section 8. The arrangement is made so that the from the Outlet openings 10 emerging gas flow radially impinges on the baffle 6. The entrained aerosol particles impinge on the baffle 6 and are held thereon while the gas flow continues to flow.

The holding section 7 has an axial inlet opening 11 for the gas flow. Further, the holding portion 7 on its outer side a circumferential, cooperating with the bracket 2 seal 12. In the example shown, the seal 12 is a separate component, for example an O-ring. This separate seal 12 is inserted into a sealing groove 13 incorporated on the outside of the holding section 7. Alternatively, the seal 12 may be molded onto the outside of the holding portion 7.

In the case of the impactor arrangement 1 presented here, a bayonet closure 14 is now formed between the impactor 3 and the console 2 in order to fasten the impactor 3 to the console 2. The bayonet closure 14 has on the holding portion 7 at least one recessed in the outside of the holding portion 7 slide guide 15. In the example shown here are according to Fig. 5 exactly two such slide guides 15 are provided, which are arranged offset by 180 ° to each other. Furthermore, the bayonet fitting 14 on a skirt 16, which in the in Fig. 1 and 5 to 7 indicated by a double arrow circumferential direction 17 surrounds the console opening 4, at least one guide member 18 which projects from an inner side of the enclosure 16 inwardly. In the example shown, exactly one such guide element 18 is provided for each slide guide 15. Accordingly, according to the enclosure 16 according to Fig. 5 exactly two arranged offset by 180 ° to each other arranged guide elements 18. The respective guide element 18 engages radially in the associated sliding guide 15 and is guided guided along the slotted guide 15 therein. The respective slotted guide 15 extends helically, ie in the circumferential direction 17, as well as in the axial direction 19. The axial direction 19 extends parallel to a longitudinal central axis 20 of the impactor third

The slotted guide 15 has in particular according to Fig. 2 at an axial opening end 21 of the holding portion 7 containing an inlet opening 11 an axially open insertion end 22, through which the associated guide member 18 is axially inserted into the slotted guide 15. Furthermore, the slotted guide 15 distal to said end face 21 of the holding portion 7 has a stop end 23 which forms a stop in the circumferential direction 17 for the respective guide element 18. The slide guide 15 further has a guide track 24 which extends helically from the insertion end 22 to the stop end 23. In Fig. 2 from the one guide slot 15, the insertion end 22 is shown, while from the other guide slot 15, the stop end 23 is shown.

The respective guide track 24 extends in the circumferential direction 17 and axially and accordingly extends helically. Accordingly, the guideway 24 has a pitch, which pitch varies along the guideway 24. In the example, the pitch of the guideway 24 in the direction of the stop end 23 decreases at least in an end region 25 having the stop end 23. This end portion 25 is in Fig. 2 indicated by a curly bracket.

In the example shown here, a latching 26 is also formed between the impactor 2 and the console 2. This latching 26 secures a predetermined rotational position between Impaktor 3 and console 2 against rotation. Suitably, this latching 26 is matched to the bayonet fitting 14 such that the latching 26 locks when screwing in the holding section 7 into the console opening 4 when the predetermined rotational position of the impactor 3 is reached, thereby preventing the impactor 3 from rotating in this rotational position. Likewise, the predetermined rotational position may be defined by the latch 26. The latching 26 may have at least one radially projecting, axially resilient locking arm 27 on the holding section 7. In the example shown here, the latch 26 has exactly two such latching arms 27, which are arranged offset by 180 ° to each other. The latch 26 has on the side of the bracket 2 for each notch 28 a complementary notch 29, in which the associated catch 28 engages axially when the impactor 3, the predetermined rotational position for Console 2 reached. Suitably, the latching 26 and the bayonet lock 14 may be coordinated so that the respective guide member 18 is spaced in the secured by means of the latch 26 predetermined rotational position of the impactor 3 in the circumferential direction 17 from the stop end 23. Thus, the stop end 23 prevents over-rotation of the impactor 3 relative to the console 2, while only the latch 26 defines the predetermined rotational position.

How, in particular Fig. 3 can be seen, the outlet openings 10 formed in the shell 9 are configured as nozzle openings, which are also referred to below as 10. These nozzle openings 10 are characterized in that they have in their flow direction a length which is at least twice as large as their diameter measured transversely to the direction of flow. In addition, the nozzle openings 10 may converge in the flow direction. The flow direction at the nozzle openings 10 provided here is oriented radially. Regardless of the nozzle openings 10 are here realized by the fact that outside of the jacket 9 pipe sections 30 protrude radially to realize the corresponding large nozzle length. Suitably, the pipe sections 30 are spaced radially from the baffle 6. Through the nozzle openings 10, the gas flow is concentrated and guided at high speed against the baffle 6.

As farther Fig. 3 The main body 5 in the nozzle section 8 can have a guide sleeve 31 arranged concentrically with the longitudinal center axis 20, in which a valve member 32 of a valve 33 is mounted so as to be axially adjustable. The valve member 32 has a valve stem 34 which is connected to the guide sleeve 31 via a biasing spring 35 The valve member 32 has on the valve stem 34 a valve plate 37 which cooperates with an axial valve seat 38 of the valve 33 for controlling an inlet opening 11 axially opposite axial opening 39 of the nozzle portion 8. The valve seat 38 runs in the circumferential direction 17 around this opening 39. The valve plate 37 is biased by means of the biasing spring 35 in the closed position shown in the figures, in which the opening 39 is closed. From a predetermined differential pressure, however, the valve plate 37 can lift off axially from the valve seat 38. In doing so, it releases an annular, additional radial outlet opening 40, which is also referred to below as an annular opening 40, in order to distinguish it from the nozzle openings 10 or from the other outlet openings 10 which are formed in the jacket 9. This annular opening 40 is formed only by the lifting of the valve plate 37 from the valve seat 38 and is then axially bounded by the valve seat 37 and the valve disk 38. Expediently, the baffle 6 extends axially into the region of this annular opening 40, so that the gas flow possibly exiting from this annular opening 40 likewise strikes the baffle 6.

Radially between the ring opening 40 and the baffle 6, an annular gap 41 is formed, which in Fig. 4 and in Fig. 6 is more recognizable than in Fig. 3 , This gap 41 is axially closed at one of the console 2 facing axial side, namely by an annular, radially projecting from the jacket 9 outward circulation 42 of the nozzle portion 8. At a side facing away from the console 2 axial side, the gap 41, however, is axially open. In the episode can at opened ring opening 40 from the radially emerging gas flow are deflected radially on the baffle 6 and flow through the gap 41 axially from the impactor 3.

In the area of this gap 41, a plurality of distributed in the circumferential direction 17 arranged axial guide webs 43 are expediently provided, on which the valve plate 37 is guided for its axial adjustment. The guide webs 43 start from the circulation 42 and are connected at an end remote from the circulation 42 by a ring 44 with each other.

Like yourself Fig. 3 can also be seen, an axial annular gap 46 may be axially formed between the baffle 6 and a radially projecting from the holding portion 7, the bracket opening 4 radially overlapping, circumferential collar. Further, an annular space 47 can be formed radially between the baffle 6 and the jacket 9 of the nozzle portion 8, which is axially open on one of the bracket 2 facing axial side to the annular gap 46 and which is axially closed at one side facing away from the console 2 axial side, for example again through the circulation 42, which projects radially from the jacket 9. Between the two axial sides of the annular space 47 a plurality of distributed in the circumferential direction 17 arranged support elements 48 may be provided, which support radially in the axial half of the annular space 47, the baffle 6 and thereby stabilize. Like yourself Fig. 4 can be seen, exist in the circumferential direction 17 between adjacent support members 48 sufficiently large gaps that allow gas flow. As a result of the structure described here, the gas flow exiting radially from the nozzle openings 10 and entering the annular space 47 can be deflected axially on the baffle wall 6 to the annular gap 46. This axially oriented gas flow is then deflected radially outward on the collar 45 so that it can ultimately flow radially out of the impactor 3 through the annular gap 46.

In the example shown here, the holding section 7 on the collar 45 also has a plurality of distributed in the circumferential direction 17 arranged contact zones 49 which project from the collar 45 on one of the console 2 side facing. These contact zones 49 are supported axially on an edge region 50 of the console opening 4. An embodiment in which the collar 45 is axially supported exclusively on the edge region 50 or on the console 2 via these contact zones 49 is preferred. Suitably, the bayonet closure 14 may be matched to these contact zones 49, that in the properly assembled state of the impactor 3, the contact zones 49 are axially biased at the edge portion 50 of the console 2 are supported.

The guide sleeve 31 is according to Fig. 4 with several, radially arranged holding webs 51 firmly connected to the jacket 9.

Claims (15)

1. Impactor assembly for the separation of liquid and solid aerosol particles from an aerosol, preferably from a crankcase ventilation system of an internal combustion engine,

   - having a console (2) which contains a console opening (4) through which a flow path for a gas flow is guided,

   - having an impactor (3) for the separation of the aerosol particles from the aerosol, which has a base body (5) and an impact wall (6),

   - wherein the base body (5) is hollow cylindrical and has a holding section (7) set into the console opening (4) and fastened to the console (2) as well as a nozzle section (8) disposed externally from the console opening (4), which nozzle section has several radial outlet openings (10) for the gas flow,

   - wherein the impact wall (6) is hollow cylindrical and disposed coaxially to the base body (5) on the exterior at the nozzle section (8) such that the gas flow emerging from the outlet openings (10) impacts on the impact wall (6),

   - wherein the holding section (7) has an axial inlet opening (11) for the gas flow,
   characterised in

   - that the holding section (7) has at its outer side a circumferential seal (12) cooperating with the console (2),

   - that between the holding section (7) and the console (2) is formed a bayonet fitting (14).
2. Impactor assembly according to claim 1,
   characterised in

   - that the bayonet fitting (14) has at the holding section (7) at least one slide guide (15) recessed in the outer side of the holding section (7),

   - that the bayonet fitting (14) at a rim (16) encircling the console opening (4) has a guide element (18) projecting from an inner side of the rim (16), which engages radially in the slide guide (15) and is therein adjustable, guided along the slide guide (15).
3. Impactor assembly according to claim 2,
   characterised in
   that the slide guide has at an axial end face (21), containing the inlet opening (11), of the holding section (7) an axially open insertion end (22) for the axial insertion of the guide element (18) into the slide guide (15).
4. Impactor assembly according to claim 2 or 3,
   characterised in
   that the slide guide (15) has distally to an axial end face (21), containing the inlet opening (11), of the holding section (7) an abutment end (23), which forms for the guide element (18) an abutment in circumferential direction (17).
5. Impactor assembly according to any of claims 2 to 4,
   characterised in
   that the slide guide (15) defines a guide path (24) extending in circumferential direction (17), which leads from an insertion end (22) proximal to an axial face end (21), containing the inlet opening (11), of the holding section (7) to an abutment end (23) distal to the end face (21) of the holding section (7), and which has a varying pitch, wherein it can in particular be provided
   that the pitch of the guide path (24) decreases in the direction to the abutment end (23), at least in an end portion (25) having the abutment end (23).
6. Impactor assembly according to any of claims 1 to 5,
   characterised in
   that between the holding section (7) and the console (2) is formed a latch fastening (26), which secures a predetermined rotational position between impactor (3) and console (2) against rotation, wherein in particular it can be provided that the latch fastening (26) is coordinated with the bayonet fitting (14) such that, when the holding section (7) is screwed in to the console opening (4), when the predetermined rotational position of the impactor (3) is reached, it latches and secures the impactor (3) in this rotational position against rotation.
7. Impactor assembly according to claim 6,
   characterised in

   - that the latch fastening (26) has at the holding section (7) at least one radially projecting, axially resilient latch arm (27), which has a latch (28) projecting axially therefrom,

   - that the latch fastening (26) has at the console (2) a notch (29) complementary to the latch (28), in which the latch (28) engages axially in the predetermined rotational position of the impactor (3).
8. Impactor assembly according to claim 4 and according to any of claims 6 and 7,
   characterised in
   that the guide element (18) in the predetermined rotational position of the impactor (3) is distanced in circumferential direction (17) from the abutment end (23).
9. Impactor assembly according to any of claims 1 to 8,
   characterised in

   - that the base body (5) in the nozzle section (8) has a concentrically disposed guide sleeve (31) in which a valve element (32) of a valve (33) is supported in axially adjustable manner,

   - that the valve element (32) has a valve disc (37) which cooperates with an axial valve seat (38), formed at the nozzle section (8), of the valve (33), which runs along an axial opening (39), lying axially opposite the inlet opening (11), of the nozzle section (8),

   - that the valve disc (37), when it lifts away axially from the valve seat (38) releases an annular, additional radial outlet opening (40), which is axially limited by the valve seat (38) and the valve disc (37),

   - that the impact wall (6) extends axially up into the region of this at least one additional radial outlet opening (40) such that the gas flow emerging out of this additional outlet opening (40) impacts on the impact wall (6).
10. Impactor assembly according to claim 9,
    characterised in
    that radially between the annular additional outlet opening (40) and the impact wall (6) is formed a annular gap (41), which at an axial side facing the console (2) is axially closed and which at an axial side facing away from the console (2) is axially open, such that the gas flow emerging radially out of the annular additional outlet opening (40) is at the impact wall (6) axially diverted and flows through the gap (41) axially out of the impactor (3).
11. Impactor assembly according to claim 10,
    characterised in
    that in the region of the gap (41) are disposed several axial guide fins (43) distributed in circumferential direction (17) at which the valve disc (37) is guided for its axial adjustment.
12. Impactor assembly according to any of claims 1 to 11,
    characterised in

    - that axially between the impact wall (6) and a flange (45) projecting radially from the holding portion (7) and radially overlapping the console opening (4) is formed an axial annular gap (46),

    - that radially between the impact wall (6) and an outer side, containing the outlet openings (10), of the nozzle section (8) is formed an annular space (47), which at an axial side facing the console (2) is axially open to the annular gap (46) and which at an axial side facing away from the console (2) is axially closed, such that the gas flow emerging radially out of the outlet openings (10) is at the impact wall (6) diverted axially to the annular gap (46), is diverted at the flange (45) radially to the outside and flows through the annular gap (46) radially out of the impactor (3).
13. Impactor assembly according to any of claims 1 to 12,
    characterised in

    - that at the holding section (7) is formed a flange (45) which is radially projecting, which encircles in circumferential direction (17) and which overlaps radially an edge portion (50) of the console opening (4), which has several contact zones (49) which are distributed in circumferential direction (17) and which protrude from the flange (45),

    - that the flange (45) is axially supported in the edge portion (50) at the console (2) only via these contact zones (49).
14. Impactor assembly according to claim 13,
    characterised in
    that the bayonet fitting (14) and the contact zones (49) are coordinated with one another such that the contact zones (49) abut in axially pre-tensioned manner on the console (2).
15. Cylinder head cover for an internal combustion engine,

    - that has a wall section which separates an inflow area for blow-by-gas from an outflow area for blow-by-gas,

    - which is equipped with at least one impactor assembly (1) according to any of the preceding claims,

    - wherein the console (2) of the respective impactor assembly (1) forms a component of the wall section.

Images