RU2611547C2 - Oil bath for internal combustion engines and strainer system - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention relates to engine building, namely to internal combustion engines lubrication systems. The oil bath for internal combustion engines has an integrated suction pipe. The suction pipe at the oil bath (1) inlet has an inlet oriented vertically to the bath bottom and an strainer (9) consistent with the inlet. The suction pipe also has a connecting area for direct or mediated connection to the lubricating oil pump of the internal combustion engineat, this area is located above the inlet. The suction pipe wall is formed directly by the bath bottom and is covered by the top lid (6c) of the suction pipe. A receiving element (10) is provided on the suction pipe lid (6c) or between the protruding guide portions (6a, 6b) from the bath bottom side and the suction pipe lid (6c). The strainer (9) in the receiving element (10) is oriented, positioned and removably fixed in the direction (E) of oil bath (1) and/or suction pipe lid (6c) removal from the mold. The strainer system is also disclosed.

EFFECT: invention provides efficient oil suction.

18 cl, 7 dwg

Description

The present invention relates to an oil bath for internal combustion engines according to the restrictive part of claim 1, as well as a strainer system in the region of the inlet located or located in the oil bath of the suction pipe according to the restrictive part of claim 15.

A plastic oil bath equipped with an integrated suction pipe for injecting lubricating oil into the oil lubrication system of an internal combustion engine is described, for example, in DE 2007 040 665 A1. In this case, the suction pipe is partially formed directly by the bottom of the bath and partially by the cover of the suction pipe. In addition, a strainer is integrated in the lid of the suction pipe, which is oriented obliquely to the bottom of the bathtub. The oil suction channel must, however, be located or, accordingly, extend below the strainer and at the bottom of the bath. In this case, the suction hole cannot be located at the maximum depth in the oil bath at the bottom of the bath. Due to the orientation of the strainer inclined relative to the bottom of the bath, interfering turbulences in the suction oil flow may also occur in the inlet region.

In addition, DE 10 2004 036 286 A1 discloses an engine oil cooling device which has a bottom passing oil channel with an end opening extending substantially vertically to the bottom of the bath for oil intake.

The objective of the invention is to propose an oil bath, which is technologically simple to manufacture, which provides efficient suction of the oil and which is characterized by a convenient in service layout of the strainer. In addition, the object of the invention is to provide an optimal, easy-to-maintain strainer system.

The solution to this problem is carried out using the features of the independent claims. Preferred and especially expedient improvements of the invention are the subject of the dependent claims.

In accordance with the invention, it is proposed that on the cover of the suction pipe or between the guide sections of the walls protruding upwardly from the bottom of the bath and the cover of the suction pipe, a receiving element is provided in which the mesh filter is preferably oriented, placed and fixed, in particular detachably fixed, essentially in the direction of extraction from the form of the oil bath and / or cover of the suction pipe.

In this case, an embodiment is particularly preferable in which upwardly extending guide sections of the walls are made without undercuts in the direction of extraction from the oil bath mold, while, moreover, the suction lid is also made without undercuts in this direction of extraction from the form. The direction of extraction from the mold is preferably oriented essentially perpendicular to the plane of the flange of the oil bath. Due to the uniform direction of extraction from the mold, the extraction of structural elements from the mold while simultaneously laying the pipeline with rounded transitions is simplified by the casting technology and facilitates their connection by gluing or welding. In addition, in the case of servicing (when the oil bath is dismantled), the strainer oriented in the direction of extraction from the mold can be well controlled and, due to its approximately vertical position or, accordingly, suction, approximately parallel to the bottom of the bath, allows oil inlet without turbulence.

The bottom of the bath, taking into account the nature of the oil flow, as well as the manufacturing technology, can be preferably stepped and have a geodesically upper, preferably horizontally extending, section of the bottom of the bath, adjacent to a geodesically lower, preferably horizontally extending, section of the bottom of the bath, which are preferably connected substantially together a vertically extending stepped wall region as a transition wall region. The suction pipe, when viewed in longitudinal section, is approximately L-shaped and so that the inlet and / or the receiving element for the strainer is located directly next to the stepped region of the wall or, respectively, at the base in the transition region from the lower portion of the bottom of the bath to the stepped region of the wall in the lower portion of the bottom of the bath.

In addition, for optimal oil absorption, it can be provided that the suction pipe from the inlet side is expanded to form an inlet funnel, simultaneously forming and / or having a receiving element for the strainer, and this inlet funnel preferably forms a vertically extending to the agreed portion of the bottom of the bath , and also, in addition, inlet parallel to the direction of extraction from the mold and thereby parallel to the intake element for the strainer. In this case, one embodiment is particularly preferred, in which it is provided that the suction pipe for the formation of the inlet funnel expands essentially only in the transverse direction, but not in the direction of the vertical axis and / or that at least one separate region of the suction pipe continuously expands in direction of the suction funnel. In particular, with the first measure, it is achieved that the inlet has an elongated and / or elongated hole and / or slot shape and / or rectangular geometry, and thus, even with a small design height of the suction pipe in the direction of the vertical axis, a sufficiently large inlet, which helps to ensure the inlet with a calmed flow.

In addition, in order to achieve the most uniform flow rates in the oil flow, the cross-sectional area of the suction pipe must be the same over its entire length with a deviation of up to ± 20%.

A particularly suitable way, the suction funnel can be partially made at the bottom of the bath and go into the guide sections of the walls located on the side of the bottom of the bath or, accordingly, have such sections. This allows you to ensure accurate execution of the executed sections of the wall or, respectively, their end areas of connection with the adjacent cover of the suction pipe.

The strainer can be permanently connected to the suction pipe cover or sandwiched between the bottom of the bathtub and the suction pipe cover. However, a detachable installation or, respectively, fixing the strainer is particularly preferred, in particular in such a way that the receiving element on the suction pipe cover for the strainer is formed preferably extending in the direction of the vertical axis, respectively, of removing the insertion and / or sliding guide from the mold preferably on a suction funnel into which the strainer can be detachably inserted and / or fixed, respectively, locked. The strainer can accordingly be simply mounted and, if necessary, cleaned or replaced by dismantling.

In particular, the strainer may be located or formed in a fixing plate, which can be inserted into and inserted into the insertion and / or sliding guide. To this end, spring tongues can also be made on its locking plate on its edge regions located in the sliding guide, which, without a gap and with a preload, securely fix the locking plate in the insert and / or sliding guide, for example, in the provided guide grooves.

The mesh filter of the first embodiment, which is simple in manufacturing technology, can be achieved due to the fact that the mesh filter or, respectively, the fixing plate is fixed with at least one locking element on at least one located on the cover of the suction channel in the region of the receiving element springy malleable mating locking element, which, for example, respectively captures (rear) locking element. Alternatively or in addition to this, the strainer may also have a spring-loaded or spring-loaded or respectively elastic (resiliently) spring-loaded locking element, for example, in the form of a snap hook, which interacts with a mating locking element, for example a locking hook, in the area of the receiving element . The locking element of the strainer is attached, elastically springing, and, for example, pre-tensioned in the engagement direction, so that to disengage the connection by engagement, it is necessary to actively act on the locking element, for example, by pulling or pressing on the actuating element of the locking element, which in this case, for example , rotates the locking element.

To simplify the removal of the strainer on the fixing plate outside the sliding guide, at least one gripping circuit can be provided for extraction (pulling).

In one of the preferred improvements of the invention, a receiving element for an plug-in oil level sensor may be provided near the strainer at the bottom of the bath; if necessary, the oil level sensor inserted into the threaded hole in the bottom of the bath can simultaneously serve as a drain threaded plug when changing the oil.

In addition, fins for guiding the flow can be provided near the strainer at the bottom of the bathtub and / or on the cover of the suction pipe, which are, in particular, oriented in the longitudinal direction of the oil bath or obliquely to it and, in particular, in internal combustion engines in automobiles facilitate the inlet of oil into the inlet funnel, for example, with lateral accelerations or tilted vehicle positions.

Finally, it is proposed that the edge regions of the guide sections of the walls made at the bottom of the bathtub and the corresponding edge regions of the suction lid cover to create a rigid, vibration-resistant connection are connected (joined) to each other by welding, for example, vibration welding or, accordingly, ultrasonic welding. The oil bath and the cover of the suction pipe are preferably made of a polymer material, optionally also of metal, by casting or injection molding.

The preferred embodiments and improvements of the invention explained above and / or set forth in the dependent claims may, in addition to, for example, cases of unambiguous dependencies or incompatible alternatives, be used individually or in any combination with each other.

The task in relation to the screen filter system is solved using the characteristics of paragraph 15 of the claims.

According to claim 15, there is provided a mesh filter system in an inlet region arranged to be located or located in an oil bath of a suction pipe, which includes a mesh filter aligned with an inlet, in particular oriented substantially vertically to the bottom of the bath . According to the invention, preferably a plate-shaped strainer is detachably placed and fixed in the intake element of the suction pipe. Preferably, this detachable fixation is carried out so that the screen in the direction of the vertical axis of the oil bath or relative to the plane of the flange of the oil bath vertically, preferably essentially in the direction of extraction from the form of the oil bath and / or the suction pipe cover, can be removed from the receiving element. In addition, alternatively or additionally, it may be provided that the receiving element is formed by an insertion or sliding guide or has such a guide in which or, respectively, in which a strainer, preferably made in the form of a plate as a separate region or as a whole made in the form of a plate the strainer part can be detachably inserted and fixed, respectively, locked.

The advantages provided by the inventive screen filter system have already been evaluated in detail above. In addition, at this point it is necessary to clearly mention that this kind of strainer system can optionally be supplemented with any separate feature of the declared oil bath, which can be used in the design of the strainer system.

An example embodiment of the invention is explained in more detail below using the accompanying drawings.

Shown:

figure 1: in a exploded view obliquely from above, an oil bath made of polymer material for internal combustion engines, equipped with a suction pipe located at the bottom of the bath, equipped with a suction pipe cover and an integrated strainer;

figure 2: the oil bath in accordance with figure 1 in a local view and the image of the suction pipe and inserted into the sliding guide having a fixing plate of the strainer;

figure 3: in the enlarged image of the sliding guide at the inlet funnel of the cover of the suction pipe with an inserted strainer;

figa, b: made with a fixing plate strainer in a separate image with different positions of the snap hook;

5: an enlarged cross-sectional view of the inlet funnel in the area of the receiving element with an inserted strainer; and

6: a central longitudinal section of an oil bath together with a suction pipe.

Figure 1 shows an oil bath 1 of a polymeric material, which is described only insofar as this is necessary for understanding the present invention. Otherwise, the oil bath 1 may have a conventional design.

The oil bath 1 has a stepped bath bottom 2 with a geodesically lower bath bottom section 2a and a bath bottom section 2b located above it. Integral side walls 2 and end walls 4, which end on one common, flat-made connecting flange 5, are adjacent to the bottom 2 of the bathtub, protruding upward.

Inside the oil bath 1 is located, when viewed from the side, the L-shaped suction pipe 6 (figure 2), which runs at the bottom 2 of the bath here from the front, located on the side of the end with the connecting fitting 7 in the section 2b of the bottom of the bath through passing approximately vertically the stepwise region 2c of the wall back under the deeper located section 2a of the bottom of the bath and there ends in an expanded inlet funnel 8, here about the center. A vertically oriented strainer 9 is integrated into the inlet funnel 8 (FIG. 2). The expansion of the suction pipe 2 for the formation of the inlet funnel 8 here occurs essentially only in the transverse direction y, but does not occur or, accordingly, only slightly occurs in the z direction of the vertical axis, so that the inlet 8a formed in the inlet funnel 8 is in the bath bottom portion 2a at the base of the stepped wall region 2c, it is oriented essentially vertically to the bath bottom portion 2a and thereby runs parallel to the strainer 9, as well as parallel to the mold removal direction E, which to the direction of E demolding explained in more detail below.

The suction pipe 6 through the connecting fitting 7 is connected to a discharge pipe (not shown), which is also connected to a lubricating oil pump of the internal combustion engine, so that the lubricating oil from the oil bath section 2a 1 can be pumped into the oil circulation circulation system under engine pressure internal combustion.

The suction pipe 6, on the one hand, is formed by the guide sections 6a of the walls made on the bottom 2 of the bathtub (cf. FIG. 1), which are made without undercuts with respect to the direction E of extraction from the mold perpendicular to the connecting flange 5 (indicated by the dotted line) and form a channel open upward, which runs continuously to the inlet funnel 8 and there forms a part of this funnel with the guide sections 6b of the walls.

On top of the suction pipe 6 is closed made of a single material and in one piece and, thus, in the form of one part of the cover 6c of the suction pipe, which is made essentially also without undercut relative to its extraction from the form of the oil bath, also indicated by a dotted line, E, directions E of extraction from the mold and end edge regions of which in the final manufactured state are rigidly and impervious to oil are connected to each other by the corresponding edge regions of the guide rails of the walls 6a, 6b of the walls by welding, for example, vibration welding or, accordingly, ultrasonic welding.

The suction pipe cover 6c is provided at the inlet funnel 8 with a receiving element 10 made therein in the form of an open upward one having on both sides guide grooves 10a (Fig. 3) of an insertion and / or sliding guide, but only in a very schematic and dashed line shown in the drawing on figure 3 guide grooves 10a are also oriented in the direction E of extraction from the mold (figure 1 is indicated by a dotted line).

In the guide grooves 10a from above and in a perpendicular orientation, a mesh filter 9b is inserted and / or retracted integrally made with the fixing plate 9a until the mesh filter 9b rests against the bottom of the bathtub 2a, while the mesh filter 9 is fixed to the provided or, respectively, made in the receiving area element 10 locking hooks 10b. In this case, the locking hooks 10b are gripped on both sides of the fixing plate 9a, spring-loaded or, accordingly, elastically spring-loaded snap hooks 9c.

In Fig. 4a, snap hooks 9c are shown in their closed position, and in Fig. 4b in their open position. In addition, this can be seen very well when viewing figa and 4b together, preferably mounted like a beam, respectively, S-shaped snap-on hooks 9c here in the central region are so spring-spring connected to the locking plate 9a by means of a jumper 9f, which when applying a pressure force to the upper in the inserted position of the strainer 9 (see FIG. 5) of the freely accessible impact area 9f, the corresponding snap hook 9c rotates around the bridge 9f like a beam so that the lower engaging area 9i of the snap hook 9c having engaging hooks 9h is rotated away from the mating hook located on the receiving element or the locking hook 10b, and the engaging or grip hook 9h is released from the locking hook 10b, so that the strainer 9 can be removed from the receiving element 10.

The elastic connection of the snap hooks 9c here is such that it preloads the engaging region 9i and thereby the hook 9h in the direction of the locking plate 9a and thereby (in the inserted state of the strainer 9) engages with the locking hook 10b. Accordingly, FIG. 4a shows a basic position. Now, if the strainer (again) is to be inserted into the receiving element 10, the engaging hooks 9h slide with their optional input bevel 9j along the locking hooks 10b or, respectively, their optional input bevels 10c in the insertion direction downwards, that these hooks are first deflected outward before they then snap into place elastically or, respectively, lock under the locking hooks 10b and are locked there by a deliberate preload (Fig. 5). In principle, alternatively or additionally, the locking hooks 10b could also be made elastically springing and / or at least one locking hook 10d, which could spring resiliently, could be resiliently mounted in the region of the upper side of the inlet funnel side of the suction pipe cover 6c interacts with the response element on the fixing plate, designated 9k, which is shown in FIG. 3 only by a dashed line and schematically.

As, in addition, can be further seen in FIG. 5, the locking hooks 10d are also provided on the suction pipe cover 6c.

In addition, arcuate spring tongues 9d (compare FIGS. 4 and 5) are made on the fixing plate 9a in its edge regions interacting with the guide grooves 10a located on both sides (compare FIGS. 4 and 5), which fix the strainer 9 with a preload and, at the same time, essentially without a click in the receiving element 10.

To disassemble the strainer 9 by pulling upward from the sliding guide provided with the guide grooves 10a, the snap hooks 9c are thus disengaged from the locking hooks 10b of the fixing plate 9a. In this case, the pulling out is facilitated by the gripping circuits 9e made on the fixing plate 9a (for example, a recess), so that, for example, for servicing when the oil bath 1 is dismantled, the screen 9 can simply be removed in the direction of removal from the mold up and controlled and / or to be inserted.

Detail 9 of the strainer, as shown, can be made in one piece and from a polymeric material. But the mesh filter part 9 may also be a metal mesh filter or a perforated metal part (metal grill) filled with a polymeric material of comparable configuration. Instead of a sliding guide provided with guide grooves 10a, another type of fastening, for example a clip connection, can also be provided if necessary. Alternatively, the strainer part 9 can also be fixedly and permanently fixed, if necessary, between the guide portion 6b of the wall and the cover 6c of the suction pipe.

Due to the vertical orientation of the strainer part 9 in the oil bath 1, the suction lubricant can flow through the elongated or correspondingly rectangular inlet 8a without changing the direction in the region of the strainer part 9, so that no swirls, funnels, etc. .

The oil bath 1 with guide sections 6a, 6b and the suction pipe cover 6c provided with a receiving element 10 for the strainer part 9 are made by injection molding of polymeric material in simplified tools (in particular, without a valve), in particular, due to a single direction extraction from the mold approximately perpendicular to the plane 5 of the connecting flange and due to the construction without undercuts; in addition, the connection costs are reduced due to only two necessary structural elements 1, 6a, 6b, respectively, 6c.

In addition, the suction pipe 6, due to the described configuration, can be made with a relatively uniform cross-sectional shape that does not have deviations preventing the flow (angles and the like), while differences in cross-sectional area can be within ± 20%.

The oil bath 1 at its bottom 2 in the region of the portion 2a and the inlet funnel 8 may have several made at the bottom of the bath and protruding upward in the direction of extraction from the form of the ribs 11 for the direction of flow (figure 2). These ribs can, for example, be arranged substantially in the longitudinal direction of the oil bath 1 and / or optionally obliquely and / or bent to supply the lubricating oil flowing at the bottom 2 of the bath to the inlet funnel 8, respectively, of the strainer 9 in a desired manner.

In addition, in the immediate vicinity of the strainer part 9, a threaded hole 12 can be made in the bottom of the bathtub 2, into which an upwardly protruding rod oil level sensor 13 can be inserted (shown schematically in FIG. 1). The oil level sensor can, if necessary, simultaneously serve as a drain screw plug for lubricating oil, for example, when changing the oil.

Figure 6 shows once again a central section along the length of the oil bath 1, on which the features just described are again visible in a different perspective.

Reference List

1 oil bath

2 bottom of the bath

2a The deeper section of the bottom of the bath

2b Above bath bottom

2c stepped wall area

3 Sidewalls

4 End walls

5 connecting flange

6 Suction pipe

6a Wall guides

6b Intake funnel section

6c Suction cap

7 Connecting nipple

8 Intake funnel

8a inlet

9 Strainer

9a locking plate

9b Strainer section

9c snap hook

9d spring tongues

9e grips

9f Jumper

9g exposure area

9h hook

9i Engagement area

9j inlet bevel

10 receiving element

10a Guide grooves

10b Locking hook

10c inlet bevel

10d locking hook

11 Ribs for flow direction

12 threaded hole

13 oil level sensor

Claims (18)

1. An oil bath for internal combustion engines, which has a suction pipe integrated in the oil bath, which has an inlet at the inlet of the oil bath which is oriented substantially vertically to the bottom of the bath and a strainer aligned with the inlet, and which is located above has a connecting area for indirect or direct connection with a pump for lubricating oil of an internal combustion engine, while the wall of the suction pipe yes formed directly by the bottom of the bath and closed on top by a suction pipe lid, characterized in that a receiving element is provided on the cover (6c) of the suction pipe or between the guide sections (6a, 6b) of the walls protruding upwardly from the bottom of the bath and the cover (6c) of the suction pipe (10), in which the strainer (9) is oriented, positioned and detachably fixed substantially in the direction (E) of removing from the mold the oil bath (1) and / or the cover (6c) of the suction pipe. 2. The oil bath according to claim 1, characterized in that the suction pipe integrated into the oil bath is made by casting or injection molding and / or from a polymeric material. 3. The oil bath according to claim 1 or 2, characterized in that the upwardly extending guide sections (6a) of the walls are made without undercuts in the direction (E) of removing from the mold the oil bath (1) and that, in addition, the lid (6c) of the suction the pipeline is also made without undercut in this direction (E) extraction from the mold. 4. The oil bath according to claim 1 or 2, characterized in that the direction (E) of extraction from the mold is oriented essentially perpendicular to the plane (5) of the flange of the oil bath (1). 5. The oil bath according to claim 1 or 2, characterized in that the bottom (2) of the bath is stepped and has a geodesically upper, preferably horizontally extending portion (2b) of the bottom of the tub, adjacent to a geodesically lower, preferably horizontally extending portion (2a) the bottom of the bath, which are connected to each other preferably by a substantially vertically extending stepped wall region (2c) as a transitional region of the wall, while the suction pipe (6), when viewed in longitudinal section, is approximately L-shaped and t Thus, the inlet (8a) and / or the receiving element (10) for the strainer (9) is located directly next to the stepped region (2c) of the wall, respectively, at the base in the transition region from the lower section (2a) of the bottom of the bath to stepwise region (2c) of the wall in the lower section (2a) of the bottom of the wall. 6. The oil bath according to claim 1, characterized in that the suction pipe (6) from the inlet side is expanded to simultaneously form and / or have a receiving element (10) for the inlet funnel strainer (8), this inlet funnel ( 8) forms an inlet (8a) extending vertically to the agreed portion (2a) of the bottom of the wall, and also, in addition, parallel to the direction (E) of extraction from the mold and thereby parallel to the receiving element (10) for the strainer (9). 7. The oil bath according to claim 6, characterized in that the suction pipe (6) for the formation of the inlet funnel (8) expands essentially only in the transverse direction (y), but not in the direction (z) of the vertical axis, and / or at least one separate region of the suction pipe (6) is continuously expanding towards the suction funnel (8), while it is preferable that the inlet (8a) has an elongated and / or elongated hole and / or slot shape, and / or rectangular geometry. 8. An oil bath according to claim 6 or 7, characterized in that the suction funnel (8) is partially made at the bottom (2a) of the bath and has guide sections (6a) of the walls located on the side of the bottom of the bath. 9. An oil bath according to claim 1 or 2, characterized in that, preferably in at least some areas, the plate-shaped filter (9) is detachably placed and fixed in the receiving element (10) preferably oriented in the direction (E) of removing from the mold ), in particular in such a way that the strainer (9) can be removed from the receiving element (10) in the direction (E) of extraction from the mold. 10. The oil bath according to claim 9, characterized in that the receiving element (10) for the strainer (9) on the cover (6c) of the suction pipe is formed passing in the direction (E) of removing from the mold an insertion and / or sliding guide into which the strainer (9) can be inserted and detachably fixed, respectively, stop. 11. The oil bath according to claim 10, characterized in that the strainer (9b) is made with a fixing plate (9a) that can be inserted into the insertion and / or sliding guide and locked in it, while it is preferably provided that the fixing plate (9a), spring tongues (9d) can be made on its edge regions located in the insert and / or sliding guide regions, which, without a gap and with a preload, fix the fixing plate (9a) in the insert and / or sliding guide, in particular, in accordance with side n receiving element of the guide grooves (10a) of the inserted and / or sliding guide. 12. The oil bath according to claim 10 or 11, characterized in that the strainer (9) is detachably fixed with at least one locking element (9k) at least one located on the cover (6c) of the suction channel in the receiving area an element (10), a springy pliable mating locking element, in particular a locking hook (10a), and / or that the strainer (9) has at least one springy malleable locking element formed on it, in particular a snap hook (9c), which interacts with reciprocal locking e with an element, in particular with a locking hook (10b), in the region of the receiving element (10), in particular so that the locking element grips the counter locking element in the mounted position, and in the disengaged position, the locking element can be rotated against the pressing force of the connection so that the locking element out of engagement with the reciprocal locking element. 13. The oil bath according to claim 1 or 2, characterized in that in the immediate vicinity of the strainer (9) and / or from the inlet (8a) at the bottom (2a) of the bath is an oil level sensor (13), in particular inserted into the receiving element, preferably a threaded hole (12), at the bottom of the bath. 14. The oil bath according to claim 1 or 2, characterized in that near, preferably directly adjacent to, the strainer (9) and / or inlet (8a) at the bottom (2a) of the bath and / or on the suction lid (6c) Pipes are provided with ribs (11) for directing the flow, which, in particular, are oriented in the longitudinal direction of the oil bath (1) or obliquely to it. 15. The oil bath according to claim 1 or 2, characterized in that the edge regions of the guide sections (6a, 6b) of the walls formed on the bottom (2) of the bath and the corresponding edge regions of the suction pipe cover (6c) are rigidly connected to each other by joining, in particular by vibration welding or ultrasonic welding, respectively, and / or that the oil bath (1) and the suction lid (6c) are made of metal or a polymer material by injection or injection molding. 16. The strainer system in the region of the inlet made with the possibility of location or located in the oil bath according to one of claims 1 to 15 of the suction pipe, which includes a strainer matched with the inlet, characterized in that the strainer (9) is detachable placed and fixed in the intake element (10) of the suction pipe (6) so that the strainer (9) in the direction (z) of the vertical axis of the oil bath (1) or relative to the plane (5) of the oil bath flange (1) is made with possibly extraction from the receiving element (10) essentially vertically and / or in such a way that the receiving element (10) is formed by an inserted and / or sliding guide or has such a guide into which the strainer (9) can be detachably inserted and fixed, respectively, to stop. 17. The screen filter system according to clause 16, wherein the screen filter (9) is arranged to be removed from the receiving element essentially in the direction (E) of extracting from the mold the oil bath (1) and / or the cover (6c) of the suction pipe . 18. The screen filter system according to item 16 or 17, characterized in that the screen filter (9), preferably made in the form of a plate as a separate region or as a generally made in the form of a plate part of the screen, can be detachably inserted and fixed, respectively, to be locked in the form of an inserted and / or movable guide receiving element (10).

Images