Easily removable arrangement of an exterior room surrounding an interior room

Abstract

The invention relates to a set of components (19) comprising a first part (3) and a second part (6, 13, 14, 15, 16). The second part (6, 13, 14, 15, 16) encloses the first part (3). The first part (3) and the second part (6, 13, 14, 15, 16) are connected to each other by a friction-type joint. The second part (6, 13, 14, 15, 16) includes at least one recess (7) adjacent to the contact surface of the first part (3) and the second part (6, 13, 14, 15, 16). Fig. 3

Description

Title of the invention: Easily removable arrangement of an exterior part surrounding an interior part

[0001] The invention relates to a set of components, the set of components comprising a first part and a second part, in which the second part at least partially encloses the first part, and in which the first part and the second part are connected to each other by a friction-type connection.

[0002] The invention also relates to an electric motor and / or a compression device.

[0003] In virtually all types of engineering and machine designs, different parts must be joined together. Consequently, a wide variety of possible joining techniques are known in the state of the art. These various joining techniques can be classified into three types: joins by complementary shape, joins by positive substance interlocking, and joins by friction, where combinations of two or even all three basic classes are sometimes used.

[0004] As a general rule, the bonding technique used depends on the requirements of the respective machine. For example, the bond strength, the bond durability, the environment in which the bond is used, and the cost of supplying the bond are factors that are relevant to the choice of bonding technique. For the sake of completeness, it should be noted that the aforementioned considerations are only a few examples of a wide range of possible considerations.

[0005] A particular type of such possible consideration is the reversibility of the respective connection. Sometimes, the respectively connected parts must be detached from each other, for example for maintenance reasons, to repair defective parts during the manufacture of the device, to correct displacement errors during manufacturing, or other similar reasons.

[0006] It often happens that the complexity and cost associated with two parts that need to be joined are very different. For example, one of the parts is quite expensive, while the other is very cheap compared to the first. It is then acceptable for the cheaper part to be damaged, or even destroyed, while the more expensive part must remain as intact as possible during the disassembly process.

[0007] The reversibility of the bond has become very important in recent years, as there is a global trend towards increasing the reusability and recyclability of parts and materials. From a financial point of view, it is advantageous for manufacturers to increase the reusability and recyclability of parts and materials, because this This directly reduces manufacturing costs (for example, by reusing a part without needing to buy a new one). Consequently, the product's market price can be reduced and market share can be increased.

[0008] An example of such a situation exists in the field of spindle devices, such as electric motors, electric generators, compressors, or hydraulic motors: the rotor of the respective spindle device generally has a relatively large number of fixed sub-assemblies, so that the respective rotor component is quite expensive. Furthermore, or alternatively, the respective rotor often comprises expensive raw materials, such as rare-earth elements or the like. This rotor is assembled in a bearing within a corresponding housing. To prevent axial movement of the two components, retaining devices (essentially washer-type elements or collar-type elements) are generally used. Although these prevent axial movement, they nevertheless allow rotational movement of the respective rotor.

[0009] A common fastening technique for the retaining element on the rotor and / or shaft is the press fit or shrink fit. In this case, the retaining device is pressed onto the rotor / shaft by the application of mechanical forces (axially aligned mechanical forces). In the case of shrink fit fastening techniques (in order to reduce the mechanical forces that occur), the retaining device is first heated before the actual fastening, so that thermal expansion increases the tolerances between the respective parts, thus reducing the required fastening forces (although a certain amount of thrust force in the axial direction is generally still necessary).

[0010] To be complete, the situation described above does not only occur for retaining elements, but also for other types of parts such as counterweights or the like.

[0011] It may happen that the fastening process is not sufficiently precise or that another type of defect is detected (requiring the removal of the retaining element, counterweight, or similar components). It is then necessary to remove the part, preferably causing as little damage as possible to the shaft, rotor, and / or other adjacent parts. This can be done by removing the respective component. However, particularly when a shrink-fit fastening technique has been used (with thermal expansion before the component is placed on the rotor), damage to the shaft is quite often unavoidable.

[0012] For this reason, it has already been suggested that the retaining device or counterweight be cut so that it can be easily removed from the rotor. However, such a cut must be made with great precision so as not to damage the rotor and / or the shaft. This is therefore time-consuming and expensive, and thus undesirable.

[0013] It is therefore evident that there is a will in the technology to offer an improved set of components, in which one of the two connected parts of a set of friction-type connecting components can be removed from the other part, without damaging the other part (where it is permissible to destroy the first part).

[0014] An object of the present invention is therefore to provide a set of components, comprising a first part and a second part, in which the second part at least partially encloses the first part, and in which the first part and the second part are connected to each other by a friction-type connection, so that the set of components is improved compared to the sets of components of this type which are known in the state of the art.

[0015] Another object of the invention is to propose an electric motor and / or a compression device, comprising a set of components of the aforementioned type which is improved compared to electric motors and compressor devices, as they are known in the state of the art.

[0016] A set of components, an electric motor and / or a compression device according to this disclosure resolves / resolve at least one of these objectives.

[0017] It is suggested to design a set of components which includes a first part and a second part, in which the second part at least partially encloses the first part, and in which the first part and the second part are connected to each other by a friction-type connection such that at least one of the first part and the second part includes at least one recess near the contact surface of the first part and the second part.

[0018] Usually, the first piece and the second piece are more or less rotationally symmetrical (including an n-number symmetry: although this is not necessarily required; by way of example, triangular, rectangular, quadratic, pentagonal, hexagonal, heptagonal, octagonal, etc. designs are also possible), particularly in the region in which the respective pieces come into contact with each other (which may relate in particular to a radial and / or axial position; "radial" may in particular be interpreted as the outer surface part of the first piece and / or the inner surface part of the second piece).

[0019] As a general rule, the second part has an axial extent - usually significantly - smaller than the first part, although this is not necessarily required.

[0020] When referring to a partial wrapping of the first part by the second part, this should generally be interpreted in such a way that a friction-type connection can be made and can itself be self-supporting (self-holding). For example, the second part must wrap around the first part by at least 190°, 200°, 210°, 220°, 230°, 240°, 250°, 260°, 270°, 280°, 290°, 300°, 310°, 320°, 330°, 340° or 350° up to 200°, 210°, 220°, 230°, 240°, 250°, 260°, 270°, 280°, 290°, 300°, 310°, 320°, 330°, 340°, 350° or 360°. It should be noted that the wrap-around does not necessarily mean that contact between the first part and the second part is actually present over the entire wrap-around range. In fact, this is generally not the case. Usually, a non-contact zone (possibly accumulated) of at least 1°, 2°, 3°, 4°, 5°, 10°, 15°, 20°, 30°, 40°, 50° and up to 5°, 10°, 20°, 30°, 40°, 45°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, 180°, 210°, 240°, 270°, 300°, 330°, 340° or 350° can be expected.It should be noted that at least one recess adjacent to the contact surface of the first and second parts will generally constitute such a non-contact zone (although this is not necessarily the case, particularly not necessarily over the entire axial extent of the contact region of the first and second parts). When referring to a friction-type bond, this does not preclude the possibility of using additional bond types. In particular, a positive form-lock (partial) and / or positive substance-lock (partial) bond may be used in addition. Nevertheless, generally only a friction-type bond is used, at least for the majority of the contact area, specifically for at least 70%, 80%, 90%, or 95% of the contact area.

[0021] By providing at least one recess in at least one of the first and second parts in a region close to the contact surface of said first and second parts, it is surprisingly easy to separate the first and second parts by cutting or dividing the second part at or near the respective recess (and generally destroying the second part to such an extent that it cannot be reused; it must instead be replaced by a similar or identical second part), without damaging the first part. Indeed, the recess provides an adequate tolerance and / or safety zone / volume, in particular a tolerance and / or safety zone, within which a cutting device can be moved without removing material from the first part (and possibly the second part).It should be noted that at least one recess may be provided in the first part, the second part, or in both parts. If a recess is provided in both parts, these recesses may or may not be aligned in a direction of rotation.

[0022] The at least one recess that is close to the contact surface of the first part and the second part is generally arranged and aligned so as to have at least one axial component (i.e., the direction of the recess and the axial direction are not perpendicular to each other). Preferably, the recess forms an acute angle with the axial direction. For example, the angle must be less than 60°, 50°, 45°, 40°, 30°, 20°, 10°, 5°, 4°, 3°, 2° or 1°. Preferably, the direction of the recess and the axial direction should be essentially the same.

[0023] It should be noted that at first glance, the presence of a recess may lead to an imbalance of masses, which would be a disadvantage. However, such an imbalance of masses can be compensated for by appropriate shaping of one or both parts, in particular the part containing the recess and / or the second part.

[0024] Based on geometric considerations of the set of components, the first part can generally be considered as an inner part, while the second part can be considered as an outer part (or vice versa).

[0025] Preferably, it is suggested that the component assembly be designed and arranged so that the second part completely encloses the first part in a circumferential manner / direction. This can be achieved by a ring-like design of (parts of) the second / outer part. In this way, a particularly strong friction-type connection can generally be achieved. It should be noted that a complete enclosement can be present over the entire axial extent of the first and / or second part. However, it may be present over only part of the axial extent of the first part and / or the second part (for example, between 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90% up to 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%; generally relative to the part with the smallest axial extent).

[0026] In particular, the component assembly can be designed and arranged such that at least one of the first and second parts (preferably both parts) is designed in an elongated manner. Preferably, at least one of the first and second parts (preferably both) is designed in an axially elongated manner. By using such a design / arrangement of the component assembly, the suggestion disclosed herein can demonstrate its features and advantages in a particularly thorough manner. In particular, such an elongated / axially elongated design is especially versatile for compressors, hydraulic motors, electric motors, electric generators, general spindle-type devices, and the like.In particular, the first inner part / piece may be a rotor, shaft or similar, while the second outer part / piece may be a retaining element, a restraining element, a counterweight or similar (including a combination of elements as well).

[0027] It is further suggested that the component assembly be designed and arranged so that the friction-type connection of at least two parts acts in the axial direction. Furthermore, or alternatively, it is suggested that the component assembly be designed and arranged so that, in a radial and / or tangential direction, at least two parts are connected by a positive form interlocking joint. These designs and arrangements (possibly separately, but especially in combination) will typically be realized due to the very geometric configuration of the component assembly for various arrangements and / or designs, particularly for elongated (axially) and / or partially and / or fully enveloping designs, especially for the aforementioned designs.

[0028] Furthermore, it is suggested that the component assembly be designed and arranged so that the first part comprises a rod-like section and / or is essentially rod-shaped. Alternatively, the component assembly may be designed and arranged so that the second part comprises a ring-like section and / or a barrel-like section. In particular, the component assembly may be designed and arranged so that the second part is essentially ring-like and / or cylindrical barrel-like. Such designs and arrangements are already used for parts of component assemblies / component assemblies as known in the prior art. Therefore, replacing already known component assemblies (or parts thereof) with the component assembly proposed herein may be particularly straightforward, increasing the acceptance of the currently disclosed component assembly.In addition, such shapes are generally used for rotating devices, such as the devices already mentioned (electric motors, electric generators, compressors, spindle devices and the like).

[0029] It should be noted that the dimensions of the contact surfaces of the components are generally constant along the axial direction. However, a conical design (in particular a Morse taper) may be present. Furthermore, the outer surface of the outer part / second part may have a variable shape, such as a barrel shape (convex outer shape) or, conversely, a hyperbolic shape (concave outer shape). A suitable choice can be made by someone skilled in the art, particularly based on stability considerations.

[0030] Furthermore, it is suggested that the component assembly be designed and arranged so that at least one recess is arranged in the second part, in which preferably the majority, and more preferably (essentially) all the recesses are arranged in the second part. In this way, only the outer part / second part needs to be modified compared to existing designs. This can facilitate migration to the currently proposed design. It is appropriate It should be noted that the second part is usually an inexpensive component and easily dispensed with. Consequently, some of the current stock can even be discarded or recycled without incurring significant financial loss. Furthermore, with the currently suggested design, any unbalanced mass (due to the presence of the recesses) can be easily corrected by appropriately reshaping the second part or similar components.

[0031] Furthermore, it is suggested that the component assembly be designed and arranged so that at least two recesses, in particular at least two recesses in the second part, are arranged at an angle of at least 90°, 100°, 110°, 120°, 130°, 135°, 140°, 150°, 160°, or 170°. Preferably, the angle can be (approximately) 180°. In this way, by providing two (or more) cutouts in appropriate positions near the recesses, the second part can be very easily detached from the first part. In particular, the second part can even more or less disintegrate without requiring the application of significant force (especially in a radial and / or axial direction). This is, of course, particularly advantageous. Moreover, at an angle of approximately 180°, the unbalanced masses induced by the recesses somehow self-balance due to their symmetrical arrangement.It should be noted that in the case where n recesses are used, the respective recesses must be arranged at an angle of 3600 / n between any two adjacent recesses.

[0032] Furthermore, it is suggested that the component set be designed and arranged so that at least one recess has a shape chosen from the group comprising V-shaped recesses, rectangular recesses, semi-circular recesses, and rounded recesses. Such designs proved particularly advantageous during initial experiments with prototypes of the component set. It should be noted that where a plurality of recesses are used, the recesses may have (partly) the same shape and / or (partly) different shapes.

[0033] Furthermore, it is suggested that the component assembly be designed and arranged so that at least one, preferably several, and even more preferably (essentially) all of the recesses extend substantially over the axial extent (total) of the second part. In particular, if at least one recess is provided in the first part, a "safety margin" can be provided so that the axial extent of the respective recess is greater than the axial extent of the second part. Thanks to this design, by incorporating a cutting process, the two parts of the component assembly can be easily separated from each other with very little force (or even none), particularly in the radial and / or axial direction.

[0034] Furthermore, it is suggested that the component assembly be designed and arranged so that the first and second parts are joined to each other by a press fit or interference fit. In this way, the component assembly disclosed herein can particularly well demonstrate its intrinsic characteristics and advantages. For the sake of completeness, press fit connections are generally made in such a way that one (or both) parts are heat-treated to shrink / expand them so that the tolerance between the two parts increases. Generally, the outer part (second part) will be heated. In addition, or alternatively, the inner part (first part) may be cooled.

[0035] Furthermore, it is suggested that the component assembly be designed and arranged so that the first part is designed and arranged as a compressor shaft or as an electric motor shaft. In addition, or alternatively, the second part may be designed and arranged as a shaft thrust bearing, as a rotor thrust bearing, as a retaining element, and / or as a counterweight.

[0036] In this way, once again, the set of components currently disclosed can demonstrate its intrinsic functionalities, characteristics, and advantages in a particularly effective manner.

[0037] Furthermore, it is suggested that the component assembly be designed and arranged so that the second part has a shortened axial span near at least one recess. Such a design can reduce cutting requirements, thereby facilitating and / or accelerating the disassembly of the two parts.

[0038] Furthermore, an electric motor and / or a compression device is proposed, wherein the respective motor / device comprises at least one set of components according to any one of the preceding claims. In this way, the respective electric motor and / or compression device can have a particularly advantageous design. In particular, it can have the same characteristics and advantages as those already described, at least by analogy. In addition, the respective electric motor / compression device can also be modified in accordance with this disclosure, at least by analogy. This will result in suitable characteristics and advantages.

[0039] Other advantages, features and objects of the invention will become apparent from the following detailed description of the invention in conjunction with the associated drawings, in which the drawings show:

[0040] [Fig.1]: a schematic cross-section of a possible embodiment of a compressor for a refrigerator;

[0041] [Fig.2]: an enlarged schematic cross-section of a section of the compressor according to [Fig.1], showing a bearing section of the rotor shaft;

[0042] [Fig.3]: a possible embodiment of a retaining element which is used in [Fig. 1] and 2 in a schematic perspective view;

[0043] [Fig.4]: a schematic top view of a variant of a retaining element according to [Fig.3];

[0044] [Fig.5]: another modification of a retaining element according to [Fig.3] and 4 in a schematic top view;

[0045] [Fig.6]: three possible embodiments of recesses that can be used for a set of components according to this disclosure;

[0046] [Fig.7]: a possible embodiment of a counterweight according to the present disclosure in a schematic perspective view;

[0047] [Fig.8]: a variant of a possible embodiment of a counterweight according to the present disclosure in a schematic perspective view.

[0048] Figure 1 shows a schematic cross-sectional view of a refrigeration compressor 1. Such a refrigeration compressor 1 is one possible embodiment of a spindle device, for which a set of components 19 according to this disclosure can advantageously be used. The compressor 1 can be used to pump refrigerant from a refrigerator. However, it should be noted that various other designs of spindle devices can be used, such as electric motors, electric generators, fluid motors, or the like.

[0049] The compressor 1 comprises a housing 2 and a shaft 3 that rotates relative to the housing 2. As is known in the prior art, various parts are attached to the shaft 3. In short, a compression unit 4 is connected to the shaft 3 in such a way as to resist the torque. The compression unit 4 currently comprises a fixed volute and an orbiting volute that are designed and arranged to perform orbital motion relative to each other in order to compress a refrigerant. Such a design is, as such, known in the prior art. The shaft 3 is rotationally supported by a bearing 5. To prevent axial movement of the shaft 3 relative to the housing 2, a retaining ring 6 is fixed to the shaft 3. On the opposite side, this shaft 3 is rotationally supported in a pot-shaped retaining device 20.The retaining ring 6 is fixed to the shaft 3 using a press-fit technique, resulting in a solid friction connection. The press-fit assembly is performed by heating the retaining ring 6 to a high temperature and sliding it onto the unheated shaft 3. After cooling, the retaining ring 6 is firmly fixed to the shaft 3.

[0050] In the embodiment shown here, the retaining ring 6 is designed and arranged as a simple circular ring. Mass balancing is currently achieved by a suitable construction of the compression unit 4.

[0051] Fig. 2 shows this set of components 19 in an enlarged cross-sectional view.

[0052] During the assembly of the retaining ring 6 onto the shaft 3, various problems can arise. For example, the retaining ring 6 may be slightly misaligned (relative to its intended position) after the shrinkage of the retaining ring 6 (due to thermal cooling) has been completed. In practical cases, it has proven very difficult, if not practically impossible, to remove the retaining ring 6 from the shaft 3 without damaging the shaft 3 (and possibly other parts as well). This is due to the very high frictional force between the two parts 3 and 6 after such a press-fit assembly.

[0053] Since the retaining ring 6 has an almost insignificant cost compared to the cost of the shaft 3 with its attached parts (especially the compression unit 4), it is essential not to damage the shaft 3 (and other parts), while the destruction of the retaining ring 6 can be easily tolerated.

[0054] It is therefore proposed, in the current state of the art, to open by cutting or simply splitting the retaining ring 6 using a suitable tool (chisel, saw, milling cutter, or similar). However, this approach is very problematic because the shaft 3 can be easily damaged by the tool used.

[0055] In order to avoid such problematic damage to the shaft 3, it is suggested, according to the present disclosure, to form at least one groove 7 or recess 7. A possible design for such a groove 7 is illustrated in [Fig.3], where a possible embodiment of the retaining ring 6 (to be used for example in the context of the compressor 1 according to [Fig.1] and 2) is shown in a schematic perspective view.

[0056] The groove 7 is arranged on the radially inner surface 8 of the retaining ring 6. Consequently, the normally cylindrical inner surface 8 is interrupted by the groove 7.

[0057] In the embodiment shown here of the retaining ring 6, the groove 7 has an essentially rectangular cross-section when viewed in cross-section, where the cutting plane is normal to the axial direction of the retaining ring 6 (see Fig. 6a). It should be noted, however, that different shapes can be used for the groove 7, such as a triangular groove 9 (see Fig. 6b) or a semi-circular groove 10 (as shown in Fig. 6c).

[0058] Furthermore, in the embodiment shown here, the axial extent of the retaining ring 6 is shortened near the groove 7, relative to the rest of the retaining ring 6. In other words, near the groove 7, an axial notch 11 (axially oriented notch 11) is provided in the retaining ring 6. In this way, a remaining closing strip 12 is formed which has a dimension smaller with respect to the radial direction, as well as with respect to the axial direction of the retaining ring 6. Nevertheless, the closure band 12 is dimensioned so that the retaining ring 6 does not open unintentionally, at least not under normal circumstances.

[0059] If the retaining ring 6 needs to be removed from the shaft 3 for any reason, a milling head or similar tool can be advanced into the outer part of the retaining ring 6. In this way, the closing band 12 can be easily opened by cutting using material removal techniques. Thanks to the groove 12, there is a certain safety margin between the inner surface of the closing band 12 and the outer surface of the shaft 3, so that damage to the outer surface of the shaft 3 can be easily avoided. For example, if the groove 7 has a depth of 1 mm, a cutting tool guidance accuracy of 0.5 mm (which is easily achievable) is more than sufficient to prevent unintentional scratching of the outer surface of the shaft 3.

[0060] Once the closure strip 12 is opened by cutting, the remaining structure of the retaining ring 6 can be opened by folding and easily removed in an axial direction.

[0061] To further facilitate the process of removing the retaining ring 6, it is possible to modify the design of the retaining ring 6. Two possible modifications are illustrated in [Fig.4] and 5, although it is obvious to a person skilled in the art that an essentially indefinite number of modifications can be made.

[0062] Figure 4 shows a first modification of the retaining ring 6 according to Figure 3. Figure 4 is a schematic top view of the retaining ring 13. In this modification, the retaining ring 13 has two grooves 7 which are positioned essentially opposite each other, i.e., at an angle of approximately 180°. Although it is still possible to cut open only one of the closing strips 12 that is adjacent to one of the grooves 7, it is also possible to cut open both of the closing strips 12. Then, the remaining half-shells of the retaining ring 13 can be easily removed from the shaft 3. Indeed, these half-shells generally fall off by themselves under the effect of gravity.

[0063] Figure 5 shows a second possible modification of a retaining ring 14, again in a schematic top view. Here, the two grooves 7 are arranged at an angle of approximately 150°. It should be noted that even at this angle, the cutting process of the two closing strips 12 adjacent to the grooves 7 will allow the two remaining parts of the retaining ring 14 to be easily removed.

[0064] Figures 7 and 8 show that the same basic idea of ​​a recess 7 and an adjacent closing band 12 (where the closing band 12 has a reduced radial extent compared to the other parts of the ring-type element 18) can also be applied to different elements, namely to the counterweight elements 15, 16. Figures 7 and 8 show two possible embodiments of the counterweights 15, 16 in schematic perspective views.

[0065] The respective counterweights 15, 16 have a cam 17 with a certain angular range outside the respective ring-type element 18 of the respective counterweight 15, 16.

[0066] As is well known in the prior art, such counterweight elements 15, 16 can be used to compensate for certain unbalanced masses of the shaft 3 and of the sub-parts which are fixed to the shaft 3.

[0067] Particular attention is paid to the design currently illustrated, in which the axial extent of the ring-type element 18 is not shortened near the groove 7 relative to the remaining parts of the ring-type element 18. In other words, no axial notch 11 is currently used.

[0068] It should be noted, however, that even for the counterweights 15, 16, an axial notch 11 can be used. Conversely, it is also possible that a retaining ring 6 (see [Fig. 3], 4, 5) may not have an axial notch 11.

[0069] The counterweight 15 according to [Fig.7] has a single groove 7. This design is similar to the design of the retaining ring 6 of [Fig.3] which also includes a single groove 7.

[0070] The counterweight 16 according to [Fig. 8] has two grooves 7 arranged relative to each other at an angle of approximately 150°, similarly to the design of the retaining ring 14 according to [Fig. 5]. Here, the size of the angle, which is currently 150°, is obviously advantageous since a cam 17 with a circumferential range of 180° is currently used. Nevertheless, the closing bands 12 near the groove 7 are arranged in a thin section of the ring-type element 18 of the counterweight 16. Consequently, a cutting operation requires less material to be removed, which significantly improves the processing speed (and can also reduce wear on the tools used).

[0071] It should be noted that identical reference numbers are used throughout this disclosure for parts that are sufficiently similar in design and / or function to justify the use of identical reference numbers, although the respective parts may not be identical. This is done for the sake of brevity and to improve understanding of the description.

[0072] It should be noted that one or more of the features of one, several or all of the detailed embodiments currently disclosed may be used in combination with the generic description in this disclosure.

[0073] Reference list: 1. Compressor 2. case 3. tree 4. Compression unit 5. level 6. retaining ring 7. groove (rectangular) 8. Interior surface 9. Triangular groove 10. Semi-circular groove 11. Axial notch 12. Closure strip 13. Retaining ring 14. retaining ring 15. Counterweight 16. Counterweight 17. came 18. Ring-type element 19. set of components 20. obviously pot-shaped

Claims

Demands

1. Assembly of components (19) comprising a first part (3) and a second part (6, 13, 14, 15, 16), in which the second part (6, 13, 14, 15, 16) at least partially encloses the first part (3), in which the first part (3) and the second part (6, 13, 14, 15, 16) are connected to each other by a friction-type connection, characterized in that at least one of the first part (3) and the second part (6, 13, 14, 15, 16) comprises at least one recess (7) adjacent to the contact surface of the first part (3) and the second part (6, 13, 14, 15, 16).

2. Assembly of components (19) according to claim 1, characterized in that the second piece (6, 13, 14, 15, 16) completely surrounds the first piece (3) circumferentially.

3. Assembly of components (19) according to claim 1 or 2, characterized in that at least one of the first part (3) and of the second part (6, 13, 14, 15, 16) is designed in an elongated manner, preferably comprising an axially elongated design.

4. Assembly of components (19) according to any one of the preceding claims, in particular according to claim 2 or 3, characterized in that the friction-type connection of at least two parts acts in the axial direction.

5. Assembly of components (19) according to any one of the preceding claims, in particular according to claim 4, characterized in that the at least two parts are connected by a positive form interlocking joint in a radial and / or tangential direction.

6. Assembly of components (19) according to any one of the preceding claims, in particular according to claim 2, 4 or 5, characterized in that the first part (3) comprises a rod-type section (3) or is essentially rod-shaped (3) and / or characterized in that the second part (6, 13, 14, 15, 16) comprises a ring-type section (8, 18) and / or a cylindrical barrel-type section or is essentially ring-shaped (8) and / or cylindrical barrel-shaped.

7. Assembly of components (19) according to any one of the preceding claims, characterized in that at least one recess (7) is arranged in the second part (6, 13, 14, 15, 16), in which preferably the majority, more preferably (essentially) all the recesses (7) are arranged in the second piece (6, 13, 14, 15, 16).

8. Assembly of components (19) according to any one of the preceding claims, in particular according to claim 6 or 7, characterized in that at least two recesses (7), in particular at least two recesses (7) in the second part (6, 13, 14, 15, 16), are arranged at an angle of at least 90°, 100°, 110°, 120°, 130°, 135°, 140°, 150°, 160° or 170°, preferably at an angle of about 180°.

9. Assembly of components (19) according to any one of the preceding claims, characterized in that at least one recess (7) has a shape, taken from the group comprising V-shaped recesses, rectangular recesses (7), semi-circular recesses and rounded recesses.

10. Assembly of components (19) according to any one of the preceding claims, in particular according to any one of claims 7 to 9, characterized in that at least one, preferably several, even more preferably all of the recesses (7) extend essentially over the axial extent of the second part (6, 13, 14, 15, 16).

11. Assembly of components (19) according to any one of the preceding claims, characterized in that the first part (3) and the second part (6, 13, 14, 15, 16) are joined to each other by a press fit or a compression fit.

12. Assembly of components (19) according to any one of the preceding claims, characterized in that the first part (3) is designed and arranged as a compressor shaft (3) or an electric motor shaft and / or characterized in that the second part (6, 13, 14, 15, 16) is designed and arranged as a retaining element (7), as a shaft stop, as a rotor stop and / or as a counterweight (15, 16).

13. Assembly of components (19) according to any one of the preceding claims, in particular according to any one of claims 2 to 12, characterized in that the second part (6, 13, 14, 15, 16) has a shortened axial extent in the vicinity of at least one recess (7).

14. Electric motor and / or compression device (1), characterized by at least one set of components (19) according to any one of the preceding claims.

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