EP4038296A1

EP4038296A1 - Rotary slide valve for regulating a flow of fluid, and method for producing a rotary slide valve

Info

Publication number: EP4038296A1
Application number: EP20792302.0A
Authority: EP
Inventors: Peter Vincon; Michael FEINDLER; Yannick Goos
Original assignee: ETO Magnetic GmbH
Current assignee: ETO Magnetic GmbH
Priority date: 2019-10-04
Filing date: 2020-10-01
Publication date: 2022-08-10
Also published as: CN114729702A; US20220364650A1; DE102019126775A1; WO2021064065A1

Abstract

The invention relates to a method for producing a rotary slide valve for regulating a flow of a fluid, comprising a rotary slide (02) which is rotatably mounted about a rotational axis (R) in a valve housing. The method has the steps of: producing the rotary slide (02) in an injection molding method, in particular in a plastic injection molding method; producing at least one circumferential or casing section (04) of the valve housing (03) in an injection molding method, in particular in a plastic injection molding method; and installing the rotary slide valve or a precursor thereof. According to the invention, a gap is formed between the rotary slide (02) and the directly adjacent valve housing circumferential or casing section (04) of the valve housing (03) in the radial direction, said gap allowing the rotary slide (02) to rotate about the rotational axis (R) and facilitating a seal which does not exceed a tolerable leak between the rotary slide (02) and the circumferential or casing section (04) of the valve housing (03).

Description

Rotary slide valve for regulating a fluid flow and method for manufacturing a rotary slide valve

The present invention relates to a method for producing a rotary slide valve according to the features of the preamble of claim 1. Furthermore, the present invention relates to a rotary slide valve with the features of the preamble of claim 12.

Generic rotary slide valves and methods for their production are known from various areas of fluid technology. For example, but by no means exclusively, said rotary slide valves of the generic type can be used in vehicles in order to control fluid flows of various operating media or operating resources there. For example, the known rotary slide valves can be used in low-pressure circuits, that is to say in circuits with preferably prevailing working pressures of less than 20 bar. For example, the regulation and / or mixing of cooling liquid or cooling water, for example to control the temperature of charge air as part of charge air temperature control by means of cooling fluid or cooling water in a secondary circuit of the cooling fluid or cooling water circuit of an internal combustion engine, can be carried out by a corresponding rotary slide valve.

In the rotary slide valves known from the prior art, it is generally provided that the rotary slide, which is rotatably mounted about an axis of rotation in a valve housing and which, depending on the application or use of the rotary slide valve, is also called a rotary plug, is opposite to the valve housing the respective inlet and / or outlet openings of the fluid or the fluids is sealed by the provision of sealing means or sealing bodies in order to ensure or ensure a tightness of the rotary slide valve. As a sealant If necessary, seals made of elastomers are used, which are arranged and used between the rotary slide valve and the valve housing, in particular in the area of the fluid inlets and fluid outlets and the associated openings in the valve housing.

Even if sufficient tightness is achieved through the use of the known sealing means of the rotary slide valves according to the prior art, the use of the known sealing means is nevertheless disadvantageous for various reasons.

On the one hand, the said sealing means have to be produced and installed or at least also installed as part of the installation of the rotary slide valve. This makes assembly more complex and expensive.

At the same time, the sealing elements, sealing bodies or sealing means are naturally subject to various wear and fatigue factors, so that the tightness of the rotary slide valve is essentially or significantly dependent on the service life or the wear and / or wear of the sealing means.

Based on this prior art, the object of the present invention is based on the specification of a manufacturing method for the manufacture of a rotary slide valve and in the proposals for a corresponding rotary slide valve, which on the one hand enables simpler and thus more cost-effective manufacture, in particular with a reduction in the number of components required for manufacture , and also leads to a rotary slide valve in which particularly durable or wear-resistant and fatigue-resistant components decide overall on the functionality, especially the tightness. This object is achieved by a method for producing a rotary slide valve having the features of claim 1. Advantageous embodiments of the invention are the subject matter of the subclaims.

This means that within the scope of the method according to the invention, in addition to the generally known production of the rotary valve in an injection molding process, in particular in a plastic injection molding process, or a metal casting process or metal sintering process, as well as the production of at least one circumferential or jacket section of a valve housing , preferably with corresponding inlet and outlet openings, also in an injection molding process, particularly preferably in a plastic injection molding process, or a metal casting process or metal sintering process, when assembling the rotary slide valve or a preliminary stage thereof, it is provided according to the invention that in the radial direction between the rotary valve and the immediately adjacent circumferential or casing section, the valve housing is formed a gap, which on the one hand enables the rotation of the rotary valve about the axis of rotation and on the other hand a seal between the rotary valve and circumferential od he jacket section allows the valve housing, which does not exceed a tolerable leakage.

In other words, this means that, according to the invention, the manufacturing accuracy of the rotary valve and / or the circumferential or casing section of the valve housing forms the basis for the said components and their corresponding surfaces being so precisely matched to one another that in the assembled state only a minimal gap between the components arises or remains, which on the one hand enables the rotation of the rotary valve about the axis of rotation, on the other hand, however, a sufficient seal or sealing effect between the valve housing and rotary valve, in particular between the rotary valve and the circumferential or jacket section of the valve housing, allows.

The present invention is thus also based on the surprising finding that there are certainly areas of application or applications for rotary slide valves, for example the areas of application already mentioned above in the area of cooling fluid low-pressure circuits and cooling fluid secondary circuits of internal combustion engines, in which a small dimension or a minimum dimension of leakage, which results, for example, due to the inevitably remaining gap between rotary slide valve and valve housing according to the present invention, is acceptable or is negligible for the functionality to be controlled or regulated by the valve, but at the same time the enormous advantage can be achieved that on corresponding sealing means or seals, for example the fluid inlet openings and fluid outlet openings in the valve housing, in particular with respect to the rotary valve slide, can be dispensed with.

In other words, this means that the present invention makes it possible to largely or at least completely dispense with additional sealing means or sealing elements, for example made of elastomeric material, since the accuracy of fit of rotary slide valve to valve housing is so accurate due to the production and assembly according to the invention and a correspondingly small gap can be achieved between the rotary slide valve and the valve housing so that the leakage to be accepted or accepted to maintain the rotary slide's ability to rotate is so small that it does not have any adverse effect on the functionality of the rotary slide valve. For the purpose of linguistic simplification, the circumferential or jacket section of the valve housing will be referred to throughout the following description as jacket section.

It can be provided that both the jacket section and the rotary slide valve are made of metal. If exactly the same materials are not used for the two components, it must be ensured that the materials used have possibly similar or identical thermal expansion behavior. The same applies to a version made of plastic if different plastics are used. However, particular attention must be paid to the thermal expansion behavior if hybrid systems are to be manufactured in which, for example, the rotary valve is to be made of metal and the casing section is to be made of plastic. Aluminum and polyphenylene sulfide plastic (PPS plastic), for example, can be used here as a possible combination in which the expansion behavior is sometimes sufficiently similar.

According to an advantageous embodiment, it can be provided that post-processing of the rotary slide and / or circumferential or jacket section of the valve housing is carried out to achieve defined outer and / or inner diameters in relation to the axis of rotation and that, in the assembled state, the rotary slide is directly attached in the radial direction the circumferential or jacket section adjoins the valve housing. The need for post-processing can be heavily dependent on the tolerances to be observed and the processes and materials used. In the case of materials and processes, for example metal casting processes, an accuracy can sometimes be achieved that makes post-processing superfluous. In the case of plastic injection molding, on the other hand, depending on the material, post-processing can be useful in order to achieve the accuracy required are necessary to ensure that the maximum permissible leakage between the rotary valve and the housing or casing section is not exceeded without additional seals or sealants.

If it is possible to manufacture the components without post-processing, they usually have an amorphous surface structure. In the case of post-processing, characteristic surface features occur on the respective surfaces that originate from the post-processing or are caused by it. For example, a grinding process leaves microgrooves on a surface of the rotary valve or the jacket section. Consequently, a rotary slide valve or casing section which has been reworked in this way has micro-grooves or grinding grooves.

The rotary slide valve and the casing section can in principle have different geometrical outer and inner surfaces, which are then subjected to the respective post-processing. Here, geometries with a constant diameter are generally known, which then lead to a rotary valve with an essentially cylindrical cross section or a cylindrical radial outer surface and also lead to jacket sections with a constant or constant inner diameter or a cylindrically shaped inner surface. However, rotary slide valves are also known in which a contour of the inner and outer surfaces that is not constant in the axial direction of the axis of rotation is provided. For example, rotary slide valves are known in which the rotary slide has an essentially spherical outer contour or outer surface and the valve housing accordingly has a likewise spherical inner surface. The present invention can also be used with geometries of this type, albeit with geometries with a constant diameter or constant radius along the axis of rotation, the post-processing is simpler and more effective can take place. In this regard, the component of the valve housing in the form of a jacket section will also be discussed again, which then forms a part of the valve housing that corresponds to a cylinder jacket or part of a cylinder jacket or at least forms a cylinder jacket on its inner surface.

According to an advantageous embodiment of the method according to the invention, it can be provided that the rotary slide valve and / or the jacket section of the valve housing are manufactured, in particular injection molded, as glass fiber reinforced plastics, preferably with a glass fiber content of 30% to 50%, the proportion of the glass fiber material or the Proportion of glass fibers relates to the weight of the rotary valve or the jacket section of the valve housing. The manufacture as glass fiber reinforced plastics or glass fiber reinforced plastic components achieves a mechanical stability which is particularly advantageous for the present invention and which is independent or at least largely independent of the shape and geometry of the components, in particular the rotary slide valve and / or the casing section, so that the rotary slide valve according to the invention can be used long-term in correspondingly variable environmental conditions without wear or changes caused by environmental conditions, in particular expansion and / or contraction of the components, adversely affecting functionality, in particular tightness, preferably due to the expansion of the gap between rotary valve and casing section.

It can also advantageously be provided that the rotary slide valve and / or the casing section is produced using a polyphenylene sulfide plastic. Also the production of said components from or at least on the basis of polyphenylene sulfide plastics enables the production of long-lasting shapes and geometries of the said components that are at the same time largely independent of environmental influences, in particular temperature influences. It is particularly advantageous to use polyphenylene sulfide plastics in combination with glass fibers or with embedding glass fibers in the context of the injection molding process.

It can also be particularly advantageously provided that the post-processing of the rotary valve comprises a grinding process, preferably a continuous grinding process, for setting the outer diameter, in particular for setting the radial outer diameter or more generally for setting the outer surface of the rotary valve. In this case, the rotary slide has micro-grooves or grinding grooves on the reworked surfaces, but these do not adversely affect the functionality and the tightness of the rotary slide valve.

Corresponding grinding processes or throughfeed grinding processes can advantageously be used to influence or process the outer contour or outer surface, preferably a radial outer diameter, of the rotary valve and at the same time allow the processing of hard to very hard materials, such as glass fiber reinforced PPS plastics.

It can also be advantageously provided within the scope of the method according to the invention that the grinding method is carried out cascaded in such a way that several rotary slides are partially plugged into one another in an axial direction and form a rotary slide assembly, the radial surface of the rotary slide assembly being essentially determined by the or surfaces to be sanded is formed. This enables a particularly effective grinding process which also to a very large extent over a large number of rotary valves deliver consistently good machining or grinding results. It can be provided that the rotary valve have complementary or partially complementary protrusions or projections and associated or matching recesses in the axial direction, which allow a partial nesting of the rotary valve and preferably at the same time enable a rotation lock or Verderhsicherung of the rotary valve assembly and thus the grinding of the Facilitate rotary valve assembly.

Since in particular glass fiber reinforced plastics, for example glass fiber reinforced PPS plastics, place high demands on the wear of abrasives, the grinding process is carried out with an abrasive based on silicon carbide according to a likewise exemplary or preferred embodiment of the method according to the invention. This ensures that the materials, which may be demanding or difficult to process with regard to processing or post-processing and which can be used in the manufacture of the rotary valve, can be processed effectively and with the necessary precision.

With regard to the post-processing of the casing section of the valve housing, a reaming process and / or a honing process can advantageously be used to adjust the inner diameter, preferably to adjust the radial inner diameter, or, more generally, to adjust the inner surface. Either a reaming machining process or a honing process is particularly preferably used, since this can then advantageously further reduce the total number of manufacturing steps or machining steps of the method according to the invention. However, it can also be provided that both a reaming machining process and a Honing process for reworking the jacket section of the valve housing is used. The advantageously provided machining methods for setting the inner diameter or the inner surface of the casing section can also ensure that the advantageously provided, hard and difficult-to-machine materials of the casing section are machined safely, reliably and with the necessary precision. The particular suitability of reaming processes and / or honing processes essentially results from the fact that an inner surface or an inner diameter of a component is reworked.

When using a honing process, the machined surface, for example the inner surface of the jacket section, has a cross pattern. This occurs when the rotation or translation (up-down movement) is superimposed during honing and can be seen on the surface when it is enlarged accordingly.

Another advantageous aspect of the method is realized in that the reaming machining method can be carried out with a tool with a hard metal cutting edge, in particular with a CVS or CVD coated cutting edge. This also takes into account the fact that the materials that are preferably used, such as metal or glass fiber reinforced plastics, place high demands on the respective machining tool with regard to wear, in particular with regard to wear on the cutting edge. However, with CVD-coated cutting edges it is entirely possible to process the glass fiber reinforced plastics that are advantageously used over a long period of time and in particular to achieve the required precision. According to a further, particularly preferred variant of the method, it can also be provided that the post-processing of the rotary slide valve and / or the casing section includes a deburring process carried out after the respective inside or outside diameter has been set. It can be provided that the jacket section of the valve housing is deburred in the area of transverse bores or in the area of transitions to the fluid inlet openings or fluid outlet openings. It can also be provided that the jacket section of the valve housing is deburred at axial ends, in particular in the area of the friction outlet. Deburring in the area of the friction inlet can also be provided.

It can particularly preferably be provided that the deburring process is carried out as a jet deburring process or as an edge milling process. In a beam deburring process, for example, plastic granules can be used, which are directed towards the respective surfaces by appropriate acceleration in a beam and cause the deburring there. Depending on the material to be processed, however, other blasting materials can also be used, such as ceramic, metal or glass. However, deburring by means of an edge milling cutter or deburring with a deburring tool with a defined cutting edge can also be provided on a corresponding machine. With regard to the deburring of the rotary slide valve, it can advantageously be provided that this takes place by means of jet deburring, whereby appropriately suitable plastic granulate can also preferably be used, which is directed in a jet at the component or at several components.

This post-processing also leaves characteristic features on the surfaces. According to a likewise advantageous aspect of the method, provision can also be made for a housing cover and / or housing base to be provided that closes or closes the valve housing in the axial direction, with the housing cover and / or housing base preferably being made of the same material as the casing section of the Valve housing. This achieves various advantages. On the one hand, this results in a uniform, in particular a uniformly low expansion or shrinkage behavior, in particular under thermal stress or at different temperatures, whereby stresses in the valve are prevented. At the same time, a housing cover and / or housing base, preferably made of the same material as the jacket section, allows an advantageous connection of the respective elements or components of the valve housing.

In this context, it can also be advantageously provided that the jacket section and the housing cover and / or housing base are connected to one another, preferably welded to one another, particularly preferably ultrasonically welded to one another, an ultrasonic welded joint only being possible for plastic components, whereas welding is also possible and advantageous for metal components is. As a result, a secure and equally reliable connection of the components of the valve housing is achieved.

The above object is achieved with regard to a rotary slide valve for regulating a fluid flow, comprising a rotary slide which is rotatably mounted about an axis of rotation in a valve housing and wherein the rotary slide and at least one circumferential or jacket section of the valve housing as an injection-molded component, in particular as a plastic injection-molded part , are formed, solved in that in the radial direction A gap is formed between the rotary valve and the immediately adjacent circumference or casing section of the valve housing, which on the one hand enables the rotary valve to rotate about the axis of rotation and, on the other hand, allows a seal between the rotary valve and the casing section of the valve housing that does not exceed a tolerable leakage.

In other words, this means that the object of the present invention with regard to the rotary slide valve is achieved in that, in the assembled state or at least in a partially assembled state of the rotary slide valve, the outer surface or part of the outer surface of the rotary slide valve directly adjacent to an inner surface or a Part of the inner surface of the valve housing, in particular in the area of a jacket section of the valve housing, is arranged without sealing means or sealing elements being arranged between the rotary slide valve and the valve housing, for example in the area of transverse bores or inlet openings or outlet openings for the fluid to be controlled or regulated .

It can preferably be provided that the gap has a gap width which is between a few micrometers and a few hundred micrometers, preferably approximately 350 μm. When dimensioning the gap width, it is essentially decisive which leakage should not be exceeded, which nominal diameter the valve has, which functionality (mixing / switching / regulating) the valve fulfills and how many fluid inlet and fluid outlet openings exist. Such a gap width can on the one hand be achieved with a relatively high amount of machining work for the valve components and at the same time ensures a minimum degree of tightness. In other words, such a gap or such a gap width ensures that a tolerable or reasonable leakage or leakage rate is not exceeded. Ever Depending on the application, the reasonable or tolerable leakage or leakage rate can vary. In the applications of rotary slide valves already exemplified at the beginning, for example when used as a mixing valve, preferably in a low-pressure circuit of a coolant or cooling fluid circuit, a leakage of less than 0.1 l / min at a working pressure of about 1.5 to 2 bar can occur and a position of the rotary slide valve in one of the end positions can still be considered acceptable.

Depending on the number and arrangement of the fluid inlet openings and fluid outlet openings and depending on the functionality of the rotary slide valve, the leakage gap lengths that are formed by the gap can vary with otherwise unchanged dimensions, so that depending on the number of fluid inlet openings and fluid outlet openings and depending on the functionality , for example switching functionality, mixing functionality and the like, the leakage or the leakage rate are impaired. It may therefore be necessary to adapt the gap width or the requirements for the gap width in relation to the valve, in particular in relation to the nominal diameter of the rotary slide valve, to the respective design of the rotary slide valve in order to comply with the permissible or tolerable leakage limit without affecting the Use of sealants, such as elastomer seals, to have to resort to.

In order to avoid unnecessary repetition, reference should also be made to the preceding statements with regard to the method for its production with regard to the effects and advantages of the rotary slide valve. In other words, this means that the features, effects and Advantages should also be viewed as relating to the device and vice versa, as far as indicated.

The rotary slide valve and the casing section can alternatively be implemented as metal components, preferably as cast metal components or as sintered metal components, as an alternative to being configured as injection-molded or plastic injection-molded parts. The metal components have a mechanical stability that can only be achieved with plastic components with special plastics or plastic composite materials.

According to an advantageous embodiment of the rotary slide valve, provision can also be made for the rotary slide and / or the jacket section of the valve housing to be designed as glass fiber reinforced plastic components, in particular with a glass fiber content of 30% to 50% by weight.

The design of the rotary slide valve and / or the casing section as, in particular glass fiber reinforced, plastic components thus enable, among other things, the rotary slide valve to be operated in a wide temperature range without the gap dimensions, in particular the gap width, and thus the leakage or leakage rate changing noticeably.

It can also advantageously be provided that the rotary slide valve and / or the casing section are designed as, preferably glass fiber reinforced, plastic components based on polyphenylene sulfide plastic.

Furthermore, it can advantageously be provided that the rotary slide valve has a ground, preferably radial, outer surface. The ground surface or outer surface preferably has grinding grooves or Microgrooves on. It can advantageously be provided that the grinding is carried out in cascade with different abrasives, for example with abrasives of different grain sizes, in order to achieve an optimal grinding result. For example, the grinding can be carried out as long or with increasing precision until the diameter tolerance of the rotary valve is between 1 pm and 100 pm for one. The influencing variables specified in relation to the gap width are also decisive here and must be taken into account accordingly.

In addition, it can advantageously be provided that the jacket section has a preferably radial inner surface produced in a reaming process and / or a honing process.

In the case of a honing process, this creates a cross pattern on the machined surface, so that, for example, the inner surface of the jacket section has a cross pattern.

If necessary, a reaming process can therefore be combined with a honing process in order to achieve the reworked inner surface of the casing section of the valve housing, the reaming process then preferably being carried out before the honing process is carried out. However, there can also be an exclusively reamed inner surface or an inner surface machined exclusively with a honing process. In addition to the reaming process and / or honing process, a pre-drilling can also be carried out, which is then preferably followed by both a reaming process and a honing process. With the last-mentioned variant, even if this provides for the most extensive procedure, the lowest tolerance of the inner surface is achieved. Overall, it can advantageously be provided that the inner surface of the jacket section is implemented with a diameter tolerance of 1 μm to 100 μm. The influencing variables specified in relation to the gap width are also decisive here and must be taken into account accordingly.

According to a further advantageous embodiment of the rotary slide valve, it can be provided that the jacket section and / or the rotary slide has a deburred inner surface or outer surface. The deburring is advantageously carried out in addition to the other post-processing methods for setting or realizing the desired inside diameter or outside diameter.

Furthermore, it can advantageously be provided that the components, in particular the rotary slide valve and / or the casing section of the valve housing, are washed before assembly and after post-processing in order to remove chips and other particles before assembly.

A likewise advantageous embodiment of the rotary slide valve can also provide that the valve housing has closing and / or closing housing covers and / or housing bases in the axial direction, which are preferably made of the same material as the casing section of the valve housing.

It can likewise advantageously be provided that the jacket section, the housing cover and / or the housing base are connected to one another, preferably welded to one another, particularly preferably ultrasonically welded to one another. An ultrasonic weld joint is only for Plastic components make sense, whereas welding is also possible and advantageous for metal components.

Details of the method according to the invention and the rotary slide valves according to the invention are explained below with the aid of merely schematic drawings of exemplary embodiments.

These show: FIG. 1: a sectional drawing through a rotary slide valve according to the invention in a first embodiment;

2: a perspective illustration of a rotary slide valve for use in the method according to the invention and the rotary slide valve according to the invention;

3: an illustration of a plurality of rotary slide valves in an assembled state during one or more method steps of the method according to the invention.

1 shows a section through a rotary slide valve 01 according to the invention with an essentially cylindrical rotary slide 02 and a valve housing 03 adapted to the shape or geometry of the rotary slide 02. The rotary slide 02 can be made of glass fiber reinforced plastic or, alternatively, a metal. The valve housing 03 comprises a circumferential or jacket section 04, which will be referred to below as jacket section 04. The jacket section can also be made from glass fiber reinforced plastic or, alternatively, from a metal. Furthermore, the valve housing 03 comprises a housing base 05 and a housing cover 06. The housing base 05, the housing cover 06 and the jacket section 04 are connected to one another, in particular welded to one another, in the assembled state of FIG. 1 by connections, for example ultrasonic weld seams, which are not shown in FIG. 1. The ultrasonic weld seams are created during the ultrasonic welding of plastic components. When using metallic materials and components, classic welding processes can be used to join metals. The rotary valve 02 has a drive pin 07, which can be designed in one piece or in several parts with the rotary valve 02, and which is connected to the rotary valve 02 through a corresponding opening in the housing cover 06 in order to apply an actuating force of an external drive via the drive pin 07 to the rotary valve 02 to transfer.

The rotary slide valve 02 has one or more channels or recesses 10 on its essentially cylindrical outer surface 08, which, depending on the rotational position of the rotary slide valve 02 about the axis of rotation R, perform the switching function or mixing function or some other function of the rotary slide valve 01 through the release position, restriction or To enable regulation of a fluid flow between the fluid openings 09 formed in the jacket section 04. For example, the recesses 10 formed on the outer surface 08 of the rotary valve 02 can have a variable width or fleas and thus influence the flow rate or the flow volume of the fluid to be controlled or regulated depending on the rotational position of the rotary valve 02.

A sealing element or a seal can be provided outside the valve housing 03 in order to preferably seal off the rotary slide valve 02, in particular the drive pin 07, in the axial direction or with respect to the corresponding opening of the housing cover 06. The Corresponding seals or sealing means are provided with the reference symbol 12 in FIG. 1.

In the interior of the valve housing 03, in particular between the radial outer surface 08 of the rotary slide valve 02 and the radial inner surface 13 of the casing section 04, in particular in the area of the fluid openings 09, no sealing means or no seal is arranged. Rather, the inventive method allows the inventive arrangement of the components, as shown in Fig. 1, in which a very narrow gap 14 is formed between the jacket section 04 and rotary valve 02, which is selected so small that the rotation of the rotary valve allows and at the same time a tightness of the rotary slide valve is achieved, which does not exceed a permissible or tolerable leakage or leakage rate. For this purpose it can be provided that both the rotary valve 02 and the casing section 04 are made of glass fiber reinforced plastic components, which are first injection molded and after the injection molding process with corresponding finishing processes, in particular on the outer surface 08 and the inner surface 13, are reworked in such a way that the gap width of the gap 14 is minimized to such an extent that the leakage or leakage rate does not exceed the reasonable or tolerable limits. Alternatively, depending on the precision of the manufacturing process of the components, post-processing can be omitted.

With regard to the jacket section 04, for example, three different method variants of post-processing are possible, although this is not intended to represent a list or list that limits the invention, but merely comprises advantageous variants. In general, there follows a post-processing after the injection molding, in which the inner diameter or the diameter of the inner surface 13 is included an allowance is made or injected, which ensures that within the manufacturing tolerances, an inner diameter that is slightly too small is generated and the subsequent machining thus leads to a desired, slightly enlarged inner diameter. In a first example, the injection with oversize is followed by pre-drilling of the inner surface, followed by reaming and subsequent honing of the inner surface, after which machining or after the machining steps for setting the inner diameter of the inner surface 13 there may be a deburring process connected, which is carried out either by blasting with plastic granulate or possibly by a deburring process with an edge milling machine and in which preferably the edges 15 of the fluid openings 09 of the jacket section 04, which are designed as transverse bores, as well as the axial ends of the jacket section 04, which, for example, the friction inlet 16 and the Represent friction outlet 17 of the jacket section 04, are deburred. A second alternative procedure could, for example, provide that after spraying, only reaming is carried out, which is preferably carried out with a reaming tool with a defined and possibly CVS or CVD-coated hard metal cutting edge, before finally deburring on a corresponding machine, preferably with a deburring tool with a likewise defined cutting edge. In a third example of the method, the spraying of the jacket section 04 is followed exclusively by a honing or a honing process to adjust the diameter of the inner surface 13, followed by blasting deburring with plastic granulate, the edges 15 of the fluid openings 09 and the axial ends 16 and 17 of the jacket section also being preferred be deburred or at least deburred at the same time. By means of the post-processing methods mentioned above, the inner surface 13 can be achieved with a tolerance with regard to the diameter which leads or at least contributes to a correspondingly low leakage rate.

The reworking of the rotary valve 02, in particular the outer surface 08 of the rotary valve 02, also contributes in the same way to the low leakage rate and / or to the smallest possible dimensioning of the gap 14. This can preferably be carried out by centerless grinding in a continuous grinding process, optionally followed by a deburring process, particularly preferably in the context of a jet deburring process with suitable plastic granulate. With regard to the implementation of the grinding process, reference is made to the following illustrations in FIGS. 2 and 3.

FIG. 2 shows a perspective illustration of a rotary slide valve 02 for use in the manufacturing method according to the invention and in the application according to the invention as a rotary slide valve.

The rotary slide valve 02 has a projection 18 on an axial outer surface 19. The projection 18, in cooperation with the drive pin 07, which is also arranged on the said axial outer surface 19, serves as an end stop of the rotary slide 02 in the valve housing 03. For this purpose, correspondingly complementary projections can be provided in the valve housing 03, in particular in the housing cover 06, which are connected to the projection 18 together form the end stops of the rotary slide valve 01. The projection 18, together with the design of the drive pin 07 shown in FIG. 2 as well as the axial inner recess 20 of the rotary valve 02 shown in FIG. 1, can be used when the rotary valve is reworked, in particular when grinding the outer surface 08 of the rotary valve 02, can be used particularly advantageously.

Because, as shown schematically in FIG. 3, the design of the drive pin 07, the outer diameter 21 of which is selected to be slightly smaller than the inner diameter 22 of the inner recess 20 of the rotary valve 02, enables several rotary valves 02 to be plugged into one another in the axial direction or lined up one behind the other, with the 3, projections 18 of the respective rotary valve, not shown in FIG. 3, serve as anti-twist protection, so that the flint-type arrangement of rotary valves 02, centerlessly shown in FIG. 3, undergoes grinding of the outer surfaces 08 in the pass, with the preferably centerless and continuous sanding of the Outer surfaces 08 advantageously cascaded, carried out with advantageously increasing precision and advantageously increasingly finer abrasives.

This means that the grinding process is carried out in a cascaded manner such that a plurality of rotary slides 02 are partially plugged into one another in an axial direction and form a rotary slide assembly 11, the radial surface of the rotary slide assembly 81 being essentially formed by the surfaces 08 to be machined or ground becomes. This enables a particularly effective grinding process that also delivers consistently good machining or grinding results to a very high degree via a large number of rotary slides. Provision can be made for the rotary valve to have complementary or partially complementary protrusions 07 or projections 18 and associated or matching recesses 20, 23 in the axial direction, which allow the rotary valve 02 to be partially nested and preferably at the same time to prevent rotation or rotation of the rotary valve assembly 11 enable and thus facilitate the grinding of the rotary valve assembly 11.

Following the grinding of the outer surfaces 08 of the rotary slide valve 02, a deburring process, in particular a

Beam deburring process. The outer surface, in particular the radial outer surface 08 of the rotary valve, can thus be produced with corresponding precision and with correspondingly low tolerances in order to realize the necessary small gap width of the gap 14 as a whole or in conjunction with the reworked valve housing, in particular the jacket section 04 of the valve housing 03 and thus to achieve a seal of the rotary slide valve 01 without additional sealing means, for example elastomer seals, at least in the casing section 04 of the valve housing.

List of reference symbols

01 Rotary slide valve 02 Rotary slide 03 Valve housing 04 Circumferential or jacket section 05 Housing base 06 Housing cover 07 Drive pin 08 Outer surface 09 Fluid openings

10 recesses

11

12 Sealant / Seal

13 Inner surface of the jacket section

14 gap

15 edges of the fluid openings

16 Friction run-in / axial end

17 Friction run-out / axial end

18 advantage

19 axial outer surface

20 axial inner recess

21 Outside diameter of the drive journal

22 inner diameter of the inner recess

23 recess

R axis of rotation

Claims

1. A method for producing a rotary slide valve for regulating a fluid flow comprising a rotary slide (02) which is rotatably mounted about an axis of rotation (R) in a valve housing with the method steps:

Production of the rotary valve (02) in an injection molding process, in particular in a plastic injection molding process, or a metal casting process or metal sintering process;

Production of at least one circumferential or jacket section (04) of the valve housing (03) in an injection molding process, in particular in a plastic injection molding process, or a metal casting process or Merall sintering process;

Assembly of the rotary slide valve or a preliminary stage thereof; characterized in that a gap is formed in the radial direction between the rotary valve (02) and the immediately adjacent circumferential or jacket section (04) of the valve housing (03) which, on the one hand, enables the rotary valve (02) to rotate about the axis of rotation (R) and on the other hand, a seal between the rotary slide valve (02) and the circumferential or jacket section (04) enables the valve housing (03) which does not exceed a tolerable leakage.

2. The method according to claim 1, characterized by post-processing of the rotary valve (02) and / or the circumference or casing section (04) of the valve housing (03) to achieve defined external and / or internal diameters based on the axis of rotation (R) is carried out and that in the assembled state the rotary slide valve (02) directly adjoins the circumferential or jacket section (04) in the radial direction, the valve housing (03).

3. The method according to claim 1 or 2, characterized in that the rotary slide valve (02) and / or the peripheral or jacket section (04) of the valve housing (03) as glass fiber reinforced

Plastics are produced, in particular injection molded, preferably with a glass fiber content of 30% to 50%.

4. The method according to any one of claims 1 to 3, characterized in that the rotary valve (02) and / or the circumferential or

Shell section (04) of the valve housing (03) is made using a polyphenylene sulfide plastic (PPS).

5. The method according to any one of claims 1 to 4, characterized in that the post-processing of the rotary valve (02) comprises a grinding process, preferably a continuous grinding process, for setting the, preferably radial, outer diameter.

6. The method according to claim 5, characterized in that the grinding process is carried out cascaded in such a way that several rotary slides (02) are partially plugged into one another in an axial direction and form a rotary slide assembly (11), the radial surface (81) of the

Rotary valve assembly (11) is essentially formed by the surfaces (08) to be machined or ground.

7. The method according to claim 5 or 6, characterized in that that the grinding process is carried out with an abrasive based on silicon carbide.

8. The method according to any one of claims 1 to 7, characterized in that the post-processing of the peripheral or jacket section (04) comprises a reaming process and / or a honing process for setting the, preferably radial, inner diameter.

9. The method according to claim 8, characterized in that the reaming machining process is carried out with a tool with a hard metal cutting edge, in particular with a CVD-coated (chemical vapor deposition) cutting edge.

10. The method according to any one of claims 1 to 9, characterized in that the post-processing of the rotary valve (02) and / or the circumference or jacket section (04) comprises a deburring process carried out after the setting of the inner or outer diameter.

11. The method according to claim 10, characterized in that the deburring process is carried out as a beam deburring process or as an edge milling process.

12. The method according to any one of claims 1 to 11, characterized by the production of the valve housing (03) closing and / or closing the housing cover (06) and / or housing base (05), which are preferably made of the same Material are made, such as the circumferential or jacket section (04).

13. Rotary slide valve for regulating a fluid flow, in particular produced with a method according to one of claims 1 to 11, comprising a rotary slide (02) which is rotatably mounted about an axis of rotation (R) in a valve housing (03), the rotary slide (02 ) and at least one circumferential or jacket section (04) of the valve housing (03) designed as injection molded components, in particular as plastic injection molded components, or as metal cast components or as metal sintered components are characterized in that in the radial direction between the rotary valve (02) and the immediately adjacent Circumferential or casing section (04) the valve housing (03) is formed with a gap which, on the one hand, enables the rotary valve (02) to rotate about the axis of rotation (R) and, on the other hand, provides a seal between the rotary valve (02) and the circumferential or casing section (04) the valve housing (03) allows which does not exceed a tolerable leakage.

14. Rotary slide valve according to claim 13, characterized in that the rotary slide (02) and / or the circumferential or jacket section (04) of the valve housing (03) are designed as glass fiber reinforced plastic components, in particular with a glass fiber content of 30% to 50%.

15. Rotary slide valve according to claim 13 or 14, characterized in that the rotary slide (02) and / or the circumferential or

Jacket section (04) of the valve housing (03) as preferred Glass fiber reinforced plastic components are made on the basis of polyphenylene sulfide plastics (PPS).

16. Rotary slide valve according to one of claims 13 to 15, characterized in that the rotary slide (02) has a ground, preferably radial, outer surface (08) which preferably has grinding grooves or microgrooves. .

17. Rotary slide valve according to one of claims 13 to 16, characterized in that the peripheral or jacket section (04) has a preferably radial inner surface (13) produced in a reaming process and / or a honing process, which preferably has a cross pattern.

18. Rotary slide valve according to one of claims 13 to 17, characterized in that the rotary slide (02) and / or the peripheral or jacket section (04) has a deburred inner surface (13) or outer surface (08).

19. Rotary slide valve according to one of claims 13 to 18, characterized by the valve housing (03) closing and / or closing housing cover (06) and / or housing base (05), which are preferably made of the same material as the circumference - or jacket section (04).