EP3184819B1 - Method for sealing two joint faces and joint face sealing - Google Patents

Description

The present invention relates to a method for sealing two parting surfaces, in particular for sealing a pump housing with a connection plate fastened thereto, and a parting surface seal produced by the method.

Already from the US 2009/127788 A1 and the DE 10 2009 039756 A1 generic methods for sealing two interfaces are known.

Such Trennflächenabdichtung or a method for sealing two interfaces finds, for example. Application in axial piston machines, in particular in axial piston pumps.

The effect of the invention is largely demonstrated by means of an axial piston pump, but is not limited thereto. Thus, the advantages of the invention can also be achieved in an axial piston machine or other hydraulic or non-hydraulic applications. It is clear to the person skilled in the art that if the invention is applied to a piston engine, the component "Pump housing" an "oil distributor" and the component "connection plate" corresponds to an "oil distribution plate".

An axial piston pump is an energy converter that absorbs mechanical power through its drive shaft and delivers hydraulic power by drawing in oil on the low pressure side of an oil circuit and using mechanical power-minus existing efficiency losses such as friction, slug loss, or the like-to build up compression power is, which is fed into the high pressure side of an oil circuit to then supply them to one or more consumers of hydraulic power.

It is advantageous in the construction of an axial piston pump if the pump housing of an axial piston pump can be sealed with a connection plate fastened to the pump housing. Therefore, the pump housing has a first separation surface, which is to be arranged oil-tight to a second interface present on the connection plate.

So far, the seal has been carried out in preparation of the pump housing or an axial piston machine such that after casting of the pump housing in the course of post-processing of a blank, a groove is worked with a so-called end mill. As a sealing element between the two parting surfaces is a so-called O-ring, which is manually inserted during assembly in a circumferential groove and thereby must be kept along its circumference in a correct position until the screw connection between the pump housing and the connection plate, which comprise the two parting surfaces, has progressed so far that a holder of the O-ring is present due to the successive movement of the two parting surfaces themselves.

Even with a suitable design of a sealing system and a correct screwing of the separating surfaces to be fastened together, the sealing function is ensured only if the seal along the entire Nutumfangs completely in an inner region of the groove for lying has come, that is correctly positioned and, for example, is not squeezed outside a groove area. Thus, it is possible under certain circumstances that the o-ring used for sealing does not remain in the groove or slip out of the groove during the screwing of the end plate onto the pump housing, as a result of which the maximum pressure that the sealing system can withstand is thereby reduced.

Also, a visual inspection by thoroughly examining a fully assembled axial piston pump does not suggest a faulty O-ring in the groove provided, as this would only be the case if a portion of the O-ring is visibly squeezed out towards a viewing area. Therefore, it does not follow from a thorough consideration, which gives no indication of a faulty placed O-ring, that the O-ring is installed in a correct manner. In fact, it is possible that a portion of the O-ring is not yet offset within the groove, but next to the groove, for example. To the pump-internal side.

Regardless of the concomitant reduced tightness, it may happen that the seal initially withstands the pressure load, so that in a test run, the malposition of the O-ring is not necessarily recognized. The faulty disposition of the O-ring may not occur at a later stage, e.g. the pump is already installed in a hard-to-reach place of a terminal, cause the tightness under a certain pressure load is no longer given, which can possibly lead to a total failure of the terminal.

It is an object of the present application to overcome the problems discussed above. This is achieved by a method according to claim 1.

The method for sealing two parting surfaces, in particular for sealing a pump housing with a connection plate fastened thereto, comprises providing a groove in a first parting surface, the groove preferably being extending from a plane defined by the first parting surface, reworking the first parting surface, preferably by a material removing tool, introducing a sealant into the groove, and applying the second parting surface to the groove and sealant provided first parting surface Preferably, the second parting surface is attached to the first parting surface. The method is further characterized in that the first parting surface is a casting and the groove is already provided in a corresponding casting blank, and when reworking the first parting surface, the reference plane for material removal is a groove bottom extending in the groove.

By providing the groove already in the casting blank of a first parting surface or of a pump housing or a connection plate, it is necessary to design the casting in the region of the groove negative in a particularly high quality.

Therefore, according to a modification of the present invention, a casting mold associated with the casting mold in the region of the groove is particularly high quality, so that a reworking of existing groove in the casting, in particular a post-processing of Nutinnenbereichs, is not required.

In addition, in a preferred embodiment of the invention, the casting mold may be designed so that a casting material is supplied in the region of the groove during casting of the casting blank in such a way that reworking of the groove, in particular reworking of a groove inner region, is not required. Due to the advantageous mold, which allows an optimal supply of the casting material in the region of the groove, a later to be performed by hand post-processing with a milling cutter or the like is not necessary. Therefore, the measures discussed above contribute to the fact that post-processing of the groove arranged in the first parting surface is not required after the casting process.

In the method according to the invention is a post-processing of the pump housing to the first separation surface, which indeed a bearing surface for the second interface is required. The removal of material takes place in contrast to previously known methods but in such a way that the groove bottom is a reference plane for a taking place material removal of the first separation surface. In the event that the two parting surfaces constitute a pump housing and a connection plate, starting from the pump housing blank at the corresponding surface facing the connection plate, ie the groove provided with the first separation surface, material removed until the distance to the plane due to the material removal migrates in the direction of the groove bottom arranged reference plane, exactly the distance of the desired depth of the groove has.

According to a further optional modification of the invention, a first separating surface extends in a region around the groove in one plane and thus forms a bearing surface for the second separating surface, wherein preferably the second separating surface is likewise flat, so that when the first separating surface is applied to the second separating surface the two separation surfaces are substantially parallel to each other.

The two parting surfaces can therefore be placed flat on top of each other, with the special feature that the first parting surface has a groove whose inner region faces the second parting surface in an applied state.

Preferably, the sealing means, which is introduced into the groove, an O-ring, wherein before introducing the O-ring into the groove, it is provided with an adhesive, so that when inserting the O-ring in the groove of the O-ring in the groove is fixed.

By providing the groove with an adhesive, a certain fixation is already achieved when inserting the O-ring. In this way, the risk of assembly errors due to slippage of the O-ring during assembly of the second interface or a connection plate can be significantly reduced become. It is also possible that the attachment of adhesive and the insertion of the O-ring can be carried out by an automatable method.

According to a further embodiment, the sealing means is a vulcanized sealing material, which is output from a metering device, preferably a metering gun, stranded in the groove. It is thus possible to convey the sealant directly from the metering device into the groove.

As an alternative to an O-ring to be inserted manually into a groove of the first separating surface or a pump housing, scorching of a sealing bead is carried out similarly to the application of silicone or polymer adhesive with a metering gun.

An advantage of this method step is that the complicated insertion of the O-ring into the groove and a holding of the O-ring in the groove is omitted until an application of the second separation surface. Namely, it is possible by issuing a vulcanized sealing material into the groove, that by means of a metering device of the vulcanized sealing material, the sealing material is introduced along the groove in this. An advantage of this is that the descendant of the metering device along the circumferential groove, in which the sealing material is to be introduced, is automated feasible.

Preferably, the sealing material is a sealing raw material, which has a particularly high adhesion to the material of the groove, so that the requirements for the surface quality of the groove are smaller.

Due to the resulting possible lower surface quality of the groove, a more cost-effective casting mold can be used, which contributes overall to a favorable process according to the invention.

According to a variant of the invention, the first separating surface is part of a pump housing and the second separating surface is part of a connecting plate or vice versa. That is, the groove described in the method and the application of the sealant may also be provided in the terminal plate.

Preferably, the groove is a flat groove having a groove bottom, which is substantially parallel to the first plane formed separation surface.

It is possible that the side walls of the flat groove extend substantially perpendicular to the plane formed just dividing surface and preferably in cross-sectional view arcuate into the groove bottom. An advantage of this embodiment of the flat groove is that the adhesion of a strand-like sealing material is also near the side wall of a high-quality groove. This would be different in an angular transition from groove bottom to the side wall of the groove, as arranged in the edge bend air may not escape and counteracts adhesion of the sealant in the groove.

Preferably, it is possible to introduce the sealant by means of an automated process in the groove.

Further, the present invention comprises a parting surface seal produced by one of the methods described above, in particular a parting surface seal for sealing a pump housing with a connection plate attachable thereto.

In this case, the pump housing and the connection plate fastened thereto can be components of an axial piston pump.

Moreover, the invention comprises a parting surface seal, which is produced by one of the methods described above, for the sealing of an oil distributor with an oil distributor plate of an axial piston machine attachable thereto.

The invention further comprises a method for sealing second parting surfaces, in particular for sealing a pump housing with a connection plate fastened thereto, the method comprising applying a coating to a first parting surface and to a second parting surface, wherein the first parting surface and the second parting surface consist of a first parting surface Consist of metal alloy.

Further, in the method, a sealing material is applied to the first parting surface, and the second parting surface is applied to the first parting surface provided with the coating and the sealant, preferably fixing the second parting surface to the first parting surface. The method is characterized in that the coating has a high adhesion to the metal alloy of the first and the second parting surface, and the sealing means has a high adhesion to the coating.

It is not necessary that one of the two parting surfaces, for example the pump housing or the connecting plate, is provided with a groove. Instead, the entire area of the pump housing, in which a groove is normally provided in a production, is provided with a special coating. The coating is applied not only to the first parting surface but also to the second parting surface.

A particular feature of the coating is that it has a high adhesion to the metal alloy of the first and second parting surfaces. The sealing means disposed between the coated surfaces of the first and second parting surfaces is clamped between these surfaces but does not extend in a groove. In this case, the sealant has a high adhesion to the coating, so that applying the sealant to one of the provided with the coating separation surfaces can be easily and accurately performed. Slippage after application of the sealant is thus very unlikely, whereby the desired sealing performance is obtained to a very high probability.

Preferably, the coating can be applied with a high reproducibility in terms of coating thickness, wherein the application of the coating in an optional further development of the invention can be carried out automatically.

The application of the sealing material can also be automated and performed with high reproducibility.

In an optional modification of the invention, neither the first parting surface nor the second parting surface has a groove in the plane defined by the parting surface. This makes it possible to obtain a parting surface seal that manages without the previously used in the prior art groove between the parting surfaces. The thereby unnecessary process steps or the resulting less complex structure of a molded part leads to cost savings.

Fig. 1:

einen Längsschnitt einer Axialkolbenpumpe,

Fig. 2:

eine Perspektivansicht einer Axialkolbenpumpe, in der zwei Trennflächen zum Abdichten eines Bereichs zu sehen sind,

Fig. 3:

die Draufsicht auf ein Pumpengehäuse von Seiten einer Anschlussplatte,

Fig. 4a & 4b:

eine Axialkolbenpumpe in der Perspektivansicht sowie einen Detailausschnitt dieser im Nahbereich einer Nut zweier Trennflächen,

Fig. 5a:

einen Querschnitt der Nut mit einer unbearbeiteten und einer bearbeiteten Trennfläche,

Fig. 5b:

einen Querschnitt der Nut mit einem darin eingebrachten Dichtmittel,

Fig. 5c:

einen Querschnitt der Nut, bei dem die beiden Trennflächen aneinander anliegen und das Dichtmittel in die Nut drängen,

Fig. 6a:

einen Querschnitt der Nut mit einem darin eingebrachten Dichtungswulst, und

Fig. 6b:

einen Querschnitt der Nut mit aneinander anliegenden Trennflächen.

Other features, advantages and details of the present invention will become apparent from the embodiments illustrated in the drawings. Show it:

Fig. 1:

a longitudinal section of an axial piston pump,

Fig. 2:

a perspective view of an axial piston pump, in which two parting surfaces for sealing a region can be seen,

3:

the top view of a pump housing from the side of a connection plate,

FIGS. 4a & 4b:

an axial piston pump in the perspective view and a detail of this in the vicinity of a groove of two separation surfaces,

Fig. 5a:

a cross section of the groove with an unprocessed and a machined interface,

Fig. 5b:

a cross section of the groove with a introduced therein sealant,

Fig. 5c:

a cross-section of the groove, in which abut the two separating surfaces to each other and urge the sealant into the groove,

6a:

a cross section of the groove with a sealing bead introduced therein, and

Fig. 6b:

a cross-section of the groove with abutting separating surfaces.

Below is in Fig. 1 an Axialkoblenpumpe shown by means of which the effect of the invention is demonstrated. However, the invention should not be limited to an axial piston pump, since their positive effects come into their own in other fields of application. Thus, the advantages of the invention can also be achieved in an axial piston machine or other hydraulic or non-hydraulic applications. For example, it will be clear to a person skilled in the art that in the case of an application of the invention to a piston engine, the component "pump housing" corresponds to an "oil distributor" and the component "connection plate" corresponds to an "oil distributor plate".

An axial longitudinal section with a label of the most important components of an axial piston pump 7 shows FIG. 1 , The drive shaft 71 is connected to the so-called engine 72, which is a cylinder drum, in the drum turret several with hydraulic piston (called engine piston) stocked cylinder bores 73 (called engine cylinder bores) are incorporated. In the zero position -the in the Fig. 1 is shown, in which there is no oil feed on the high pressure side, there is no coaxial movement in the Engine cylinders housed engine pistons 74. For the said energy conversion can take place, as part of the rotation of the engine, a corresponding coordinated axial movement of each engine piston 74 take place so that it moves out of its engine cylinder bore 73 (until reaching an end position) as long as the corresponding cylinder is connected to the oil low pressure side and the engine piston 74 is then pressed back into the engine cylinder bore 73 when it is connected to the oil high pressure side. The coordination between the angular position of the engine 72 and the coordinated connection of the individual engine cylinder bores 73 with one of the two oil circuits or a short-term blocking to both takes place via the so-called control plate 75, which is itself rotatably mounted and in the over the orbit of the engine cylinder bore respectively Holes are tuned over the angular range, so that in the course of the rotation of the engine, the currently required connection between each respective engine cylinder bore 73 and the two sides of the main oil circuit, ie the top pressure and the vacuum side is present.

The amount of torque that can be absorbed by an axial piston pump 7 (of a particular type) to deliver hydraulic power in conjunction with its speed is determined by the stroke length traveled per full revolution of the drive shaft 71 and engine pistons 74. The stroke length is defined by the oblique angle of the swashplate 76 (also called swivel cradle), which can be defined by means of an adjusting device when the hydraulic pump is operating and can be changed continuously. In idle operation of the axial piston pump 7, d. H. in the already mentioned zero position is an oblique angle of 0 ° before. In this case, the axial line of symmetry of the drive shaft 71 is exactly perpendicular to the plane spanned by the support surface of the swash plate 76 level.

The swash plate 76 is fixed so that it does not participate in the rotational movement of the engine 72. In the rotation of the engine 72 keep in it Drum revolver arranged engine pistons 74 on the attached them sliding shoes 77 on your tread contact along the support surface of the swash plate 76 by the hydraulic cylinder by means of a retraction mechanism on the co-rotating with the engine 72 retraction plate 78 applies the required contact force.

The adjustment of the swash plate 76 may, for. B. via an actuating piston 79, which is pressed by means of oil pressure from the control cylinder and transmits its movement to one side of the swash plate 76, which leads to the tilting movement due to the nature of their storage in the pump housing.

On the opposite side of the swash plate 76, a return spring is mounted, whereby a counterforce is applied to be acted upon by the actuator piston, so that depending on the oil pressure in the actuator piston dependent angular position of the swash plate 76 and thus a defined covered stroke length of the engine piston per engine full rotation results , By in the present Fig. 1 As shown section, the return spring is hidden.

The lateral surface of the engine 72 is enclosed by the pump housing. The pump housing is opposite to the side through which the toothed portion of the drive shaft 71 out of this outwardly, completely open. With respect to the pump axis, opposite to the installation location of the swash plate 76 with the overlying shoes 77 and the engine pistons 74 connected thereto are the open ends of the engine cylinder bores 73 at the open end side of the pump housing. As mentioned, the open ends of the cylinder bores 73 are contacted by the rotationally fixed control plate 75. On the open end of the pump housing, the so-called connection plate 4 is mounted, via which the connections of the axial piston pump 7 with the low pressure and the high pressure side of the oil circuit. The drive shaft 71 is mounted at the end of the pump housing 3, where the drive shaft 71 is led out through this, and at the opposite end of the pump housing 3, behind the engine 72. The out of control pistons and Return spring formed adjustment of the swash plate 76 may be integrated in the pump housing 3 or partially integrated or mounted separately.

In order for the described operation to be correct, the engine 72 and the control plate 76 must be pressed against each other and at the same time the engine has to be pressed via the so-called retraction ball 78 in the direction of the swash plate 76 so that the running surfaces of the sliding shoes 77 move along their support surface with a slight contact pressure in order to maintain the desired angle of inclination in this way, which in turn complies with the set value of the stroke length traveled by the engine pistons 74 per full revolution of the drive shaft 71. The two pressure forces described are achieved by numerous small arranged in the multi-tooth clutch 70 springs.

FIG. 2 shows a perspective view of an axial piston pump. It can be seen the pump housing 3, which is connected to a connection plate 4. In the mutually facing separating surfaces 1, 2 of pump housing 3 and connection plate 4, a circumferential groove is provided to seal a region enclosed by the groove.

FIG. 3 shows a plan view of the pump housing 3. It can be seen the circumferential groove 5, which extends in the first parting surface 1 of the pump housing 3. The groove 5 has an inner side wall 52a and an outer side wall 52b. In order to achieve a seal of the area surrounded by the groove 5, a sealant 6 is introduced into the groove before placing a second parting surface.

FIG. 4a shows again the perspective view of the grooved axial piston pump.

FIG. 4b shows a cutout area near the groove 5 in a cross section. It can be seen that the first parting surface 1 formed by parts of the pump housing 3 is flat, except for the groove 5, at the end formed by the connection plate 4 second separation surface 2 is applied. In the groove 5, a sealing means 6 is introduced, which goes beyond the height of the groove 5 in a relaxed state. By applying the two parting surfaces 1, 2 to each other, the sealant 6 is clamped between the groove bottom and the second parting surface 2 and thus provides significantly for a tightness between the inner and the outer side wall of the groove 5. Typically, it is the task surrounded by the groove to seal areas provided with oil so that the area in contact with the outer side wall of the groove 5 are free of oil or as good as oil-free. An oil passage from the oiled interior to an area defined by the groove 5 outside area should be avoided.

FIG. 5a shows a cross section of the groove 5 in the first parting surface 1, wherein the first parting surface 1 can be present both on the sides of the pump housing 3, and the connection plate 4. Shown is the groove 5 in the form of a flat groove, which is characterized in that it has a groove bottom 51 which is substantially parallel to the support surface 12 of the first separation surface 1.

Reference numeral 11 denotes the surface of the first parting surface 1, which results in the state of a cast blank. The surface quality is not critical here, since a post-processing of the surface is provided. This post-processing contains a material-removing process step, in which the surface 11 originally originating from the casting blank is removed onto the final surface 12 or also bearing surface of the first parting surface 1. Here then a very high surface quality is required.

It is of great advantage to see the reference plane for the machining of the surface 11 towards the surface 12 of the casting in the groove bottom. Since the casting blank in the region of the groove bottom 51 is of such high quality that no post-processing is required here, or the feed material in the casting mold is supplied in such a way that the casting material can optimally accumulate in the groove region, an automatic, post-machining process is the as a reference plane the groove bottom 51 draws, possible. The reworking of the blank in the groove 5 can be omitted. Only the post-processing of the surface 11 to the final contact surface 12 of the second parting surface 2 is required.

In the transition region of the groove bottom 51 to the contact surface 12 of the first parting surface 1 side surfaces 52 of the groove 5 are present, which are substantially perpendicular to the newly formed contact surface 12 and the first parting surface 1 and merge into the groove bottom 51 in Querschnitssicht arcuately. The expansion region of the flat groove 5 is marked B. In this area, the casting has a very high surface quality. T denotes the groove depth, which is determined starting from the groove bottom 51 which is not to be subjected to a post-processing.

FIG. 5b shows a groove 5 in a cross-sectional view in which a sealing means 6 in the form of an O-ring 61 is inserted centrally in the groove 5. It can be seen that the groove depth T is less than the diameter of the substantially circular O-ring 61 in its cross section. This ensures that when the second separating surface 2 is applied to the first separating surface 1, the O-ring 61 is urged in the direction of the groove bottom 51 and creates a better sealing effect.

FIG. 5c shows this state in which the second separation surface 2 is placed on the first separation surface 1. In this case, the sealing means 6, here in the form of an O-ring 61, is urged in such a way that the part of the sealing means originally projecting out of the groove 5 is completely pressed into the groove 5. This results in larger contact areas of the sealing means 6 between the first parting surface 1 and the second parting surface 2.

FIG. 6a shows a cross section of the groove 5 with a sealing bead 62 introduced therein. The sealing bead 62 can be introduced in a strand-like manner from a metering device into the groove 5. By the reference numeral 52a, the inner edge of the groove 5 is designated, whereas 52b denotes the outer edge of the groove 5. For better understanding, the determination of inside edges 52a and Outside edge 52b already in FIG. 3 located. Since the groove is a circumferential groove 5, the definition of the inner and outer edges 52a, 52b is easily understood on its own.

In the figure, the sealing bead is placed along the entire groove 5 along the outer edge 52b. As a result, when the second separating surface 2 is put on, the seal 62 is pressed into the region to be sealed by the oil pressure inside the pump. In other words, a high pressure from the inner side wall 52a side toward the outer side wall 52b comes from the inside of the area enclosed by the groove 5. By fitting the gasket 6 to the outer side wall 52b, the gasket 6 is pressed in a sealing manner against the outer side wall 52b and enhances the sealing effect as a whole. Therefore, it is advantageous to arrange a seal 6 or a sealing bead 62 in the groove 5 so that it is in contact with the outer side wall 52b of the groove 5. It is thereby prevented that when a high pressure exerted from the inside of the circumferential groove 5 to a displacement of the seal 6, which may lead to a seal waste.

If a seal 6 made by means of an O-ring 61 or a seal 6 made by means of a sealing material 62 comes to rest on the inner edge 52 a of the sealing groove 5, oil can push through the present pressure inside the pump under the seal 6.

Therefore, a significant oil loss threatens up to complete leakage. The advantageous arrangement position of the seal 6 applies both to an O-ring 61 and to a sealing material 62, which is obtained strand-like from a metering device.

FIG. 6b shows a cross section of the groove after placing and fixing the connection plate 4 on the pump housing 3. In this case, the two parting surfaces 1 and 2 are aligned with each other plan and arranged in the groove 5 sealing material 62 urges toward the inner side wall 52a of the groove 5. A pressure from the side of the inner side wall 52a toward the outer side wall 52b urges the sealing material 62 still further towards the outer side wall 52b, thus resulting in a particularly tight seal, but no displacement of the seal 6, so that leakage of oil is not possible.

Claims (11)

1. A method of sealing two joint faces (1, 2), in particular of sealing a pump housing (3) having a connector plate (4) fastenable thereto, wherein the method comprises:

   providing a groove (5) in a first joint face (1), with the groove (5) preferably extending from a plane that is defined by the first joint face (1);

   reworking the first joint face (1), preferably by a material-removing tool;

   introducing a seal (6) into the groove (5); and

   placing the second joint face (2) at the first joint face (1) provided with the groove (5) and the seal (6), with the second joint face (2) preferably being fastened to the first joint face (1),

   wherein the first joint face (1) is a casting and the groove (5) has already been provided in a corresponding casting blank, characterized in that in the reworking of the first joint face (1), the reference plane for a material removal is a groove base (51) extending in the groove (5).
2. A method in accordance with claim 1, wherein a mold belonging to the casting blank is of particularly high quality in the region of the groove (5) so that a reworking of the groove (5) present in the casting blank is not necessary.
3. A method in accordance with claim 2, wherein the mold is adapted such that a casting material is supplied in the region of the groove (5) on the molding of the casting blank such that a reworking of the groove (5), in particular a reworking of the inner groove region (51, 52, 53) is not necessary.
4. A method in accordance with one of the preceding claims, wherein a first joint face (1) extends in a plane in a region around the groove (5) and thus forms a contact surface for the second joint face (2), with the second joint face (2) preferably likewise being configured as planar so that on the placing of the first joint face (1) at the second joint face (2), the two joint faces (1, 2) extend substantially in parallel with one another.
5. A method in accordance with one of the preceding claims, wherein the seal (6) is an O ring (61) and the groove (5) is provided with an adhesive agent before the introduction of the O ring (61) into the groove (5) so that the O ring (61) is fixed in the groove (5) on the introduction of the O ring (61) into the groove (5).
6. A method in accordance with one of the claims 1 to 4, wherein the seal (6) is a vulcanized sealing material (62) that is discharged into the groove (5) from a metering apparatus, preferably from a metering gun, in extruded form.
7. A method in accordance with claim 6, wherein the sealing material (62) is a raw seal material that has particularly high adhesion to the material of the groove (5) so that the demands on the surface quality of the groove (5) are lower.
8. A method in accordance with one of the preceding claims, wherein the first joint face (1) is part of a pump housing (3) and the second joint face (2) is part of a connector plate (4) or vice versa.
9. A method in accordance with one of the preceding claims, wherein the groove (5) is a shallow groove that has a groove base (51) that is substantially in parallel with the first, planar joint face (1).
10. A method in accordance with claim 9, wherein the side walls of the shallow groove extend substantially perpendicular to the planar first joint face (1) and preferably merge into the groove base (51) in the manner of an arc of a circle in a cross-sectional view so that the adhesion of a strand-like sealing material (62) is also of high quality close to the side wall (52) of a groove (5).
11. A method in accordance with one of the preceding claims, wherein the seal (6) is introduced into the groove (5) with the aid of an automated method.

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